euv_ui/style/class/

fn.rs

use super::*;

class! {
    // ═══════════════════════════════════════════════════════════════════════════
    // Layout Shell
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_app_root {
        display: "flex";
        height: "100%";
        padding-bottom: var!(safe-area-inset-bottom);
        font-family: "system-ui, -apple-system, sans-serif";
        background: var!(background);
        color: var!(foreground);
        user-select: "none";
        -webkit-user-select: "none";
        -webkit-font-smoothing: "antialiased";
        -moz-osx-font-smoothing: "grayscale";
        text-rendering: "optimizeLegibility";
        scrollbar-color: format!("{} {}", var!(scrollbar-thumb), var!(scrollbar-track));
        ::-webkit-scrollbar-thumb {
            background: var!(scrollbar-thumb);
            border: "none";
            border-radius: "0px";
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var!(scrollbar-thumb-hover);
        }
        ::-webkit-scrollbar-thumb:active {
            background: var!(scrollbar-thumb-active);
        }

        // ═══════════════════════════════════════════════════════════════════════════
        // CSS Reset — Cross-browser normalization
        // ═══════════════════════════════════════════════════════════════════════════

        *, *::before, *::after {
            box-sizing: "border-box";
        }
        h1, h2, h3, h4, h5, h6, p, ul, ol, dl, dd, figure, blockquote, pre, hr {
            margin: "0px";
            padding: "0px";
        }
        ul, ol {
            list-style: "none";
            padding: "0px";
            margin: "0px";
        }
        a {
            color: "inherit";
            text-decoration: "none";
        }
        button {
            appearance: "none";
            -webkit-appearance: "none";
            -moz-appearance: "none";
            background: "transparent";
            border: "none";
            padding: "0px";
            margin: "0px";
            font: "inherit";
            color: "inherit";
            cursor: "pointer";
            outline: "none";
            font-family: "inherit";
            ::-moz-focus-inner {
                border: "0px";
                padding: "0px";
            }
        }
        input, textarea, select, button {
            font: "inherit";
            font-family: "inherit";
            font-size: "inherit";
            line-height: "normal";
            margin: "0px";
            padding: "0px";
            border: "none";
            outline: "none";
            background: "transparent";
            color: "inherit";
            appearance: "none";
            -webkit-appearance: "none";
            -moz-appearance: "none";
        }
        input[type="text"], input[type="number"], input[type="email"], input[type="password"], input[type="search"], input[type="tel"], input[type="url"] {
            appearance: "none";
            -webkit-appearance: "none";
            -moz-appearance: "none";
            border-radius: "0px";
        }
        input[type="search"]::-webkit-search-cancel-button, input[type="search"]::-webkit-search-decoration {
            -webkit-appearance: "none";
            appearance: "none";
        }
        input[type="number"] {
            -moz-appearance: "textfield";
        }
        input[type="number"]::-webkit-outer-spin-button, input[type="number"]::-webkit-inner-spin-button {
            -webkit-appearance: "none";
            appearance: "none";
            margin: "0px";
        }
        textarea {
            appearance: "none";
            -webkit-appearance: "none";
            -moz-appearance: "none";
            resize: "vertical";
            font-family: "inherit";
        }
        select {
            appearance: "none";
            -webkit-appearance: "none";
            -moz-appearance: "none";
            background-image: "none";
            border-radius: "0px";
        }
        img, svg, video, canvas, audio, iframe, embed, object {
            display: "block";
            max-width: "100%";
        }
        table {
            border-collapse: "collapse";
            border-spacing: "0px";
        }
        hr {
            border: "none";
            margin: "0px";
        }
        :focus-visible {
            outline: "none";
        }
        : focus:not(: focus-visible) {
            outline: "none";
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: "inherit";
            font-size: "inherit";
        }
        strong, b {
            font-weight: "700";
        }
        em, i {
            font-style: "italic";
        }
        code, pre, kbd, samp {
            font-family: "ui-monospace, monospace";
        }
        @media ((max-width: 767px)) {
            input, select, textarea {
                font-size: "16px";
            }
        }
    }

    pub c_mobile_app_root {
        display: "flex";
        flex-direction: "column";
        width: "100%";
        height: "100%";
        font-family: "system-ui, -apple-system, sans-serif";
        background: var!(background);
        color: var!(foreground);
        padding: format!("0px {} {} {}", var!(safe-area-inset-right), var!(padding-shell-bottom), var!(safe-area-inset-left));
        scrollbar-color: format!("{} {}", var!(scrollbar-thumb), var!(scrollbar-track));
        ::-webkit-scrollbar-thumb {
            background: var!(scrollbar-thumb);
            border: "none";
            border-radius: "0px";
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var!(scrollbar-thumb-hover);
        }
        ::-webkit-scrollbar-thumb:active {
            background: var!(scrollbar-thumb-active);
        }
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Navigation - Desktop Sidebar
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_app_nav {
        // Adaptive sidebar width — `clamp()` keeps the column ≥ the historic
        // 248px floor (no regression on dense sidebar trees) and ≤ 320px on
        // roomy viewports, so longer English titles like "Internationalization"
        // stop wrapping at the historic fixed 248px.
        width: var!(nav-width);
        background: var!(background);
        border-left: format!("2px solid {}", var!(border));
        display: "flex";
        flex-direction: "column";
        // Pin the sidebar to the viewport while the main column scrolls.
        // Without this the whole row flex container scrolls as a single
        // block and the nav appears to slide off-screen with the content.
        // `align-self: stretch` (the row flex default) is overridden by
        // `flex-start` so the sticky height is the natural 100vh and not
        // stretched to match the (much taller) main column.
        position: "sticky";
        top: "0px";
        align-self: "flex-start";
        height: "100vh";
        flex-shrink: "0";
        padding-top: var!(safe-area-inset-top);
        @media ((max-width: 767px)) {
            display: "none";
        }
    }

    pub c_nav_header {
        padding: format!("{} {}", var!(space-xl), var!(space-xl));
        width: "100%";
        box-sizing: "border-box";
        font-size: var!(font-xl);
        font-weight: "700";
        color: var!(foreground);
        letter-spacing: "-0.02em";
        display: "flex";
        align-items: "center";
        gap: format!("{}", var!(space-md));
        flex-shrink: "0";
        text-decoration: "none";
        cursor: "pointer";
        position: "relative";
        ::after {
            content: "''";
            position: "absolute";
            bottom: "0px";
            left: var!(space-lg);
            right: var!(space-lg);
            height: "1px";
            background: format!("linear-gradient(90deg, transparent, {}, transparent)", var!(border));
        }
    }

    pub c_nav_brand_title {
        font-size: var!(font-xl);
        font-weight: "700";
        color: var!(foreground);
        letter-spacing: "-0.02em";
    }

    pub c_euv_logo {
        display: "flex";
        background: var!(accent);
        align-items: "center";
        justify-content: "center";
        color: var!(text-on-accent);
        font-weight: "700";
        border: "none";
        cursor: "pointer";
        padding: "0px";
        flex-shrink: "0";
        position: "relative";
    }

    pub c_euv_logo_nav {
        width: "32px";
        height: "32px";
        font-size: var!(font-lg);
    }

    pub c_euv_logo_fab {
        width: "36px";
        height: "36px";
        font-size: var!(font-xl);
        @media ((max-width: 767px)) {
            width: "44px";
            height: "44px";
        }
    }

    pub c_nav_section_label {
        padding: format!("{} {} {} {}", var!(space-md), var!(space-xl), var!(space-xs), var!(space-xl));
        margin: "0px";
        font-size: var!(font-xs);
        font-weight: "700";
        color: var!(foreground);
        text-transform: "uppercase";
        letter-spacing: "0.10em";
        flex-shrink: "0";
    }

    pub c_nav_items_scroll {
        flex: "1";
        overflow-y: "auto";
        contain: "content";
        scrollbar-color: format!("{} {}", var!(scrollbar-thumb), var!(scrollbar-track));
        ::-webkit-scrollbar-thumb {
            background: var!(scrollbar-thumb);
            border: "none";
            border-radius: "0px";
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var!(scrollbar-thumb-hover);
        }
        ::-webkit-scrollbar-thumb:active {
            background: var!(scrollbar-thumb-active);
        }
    }

    pub c_nav_theme_toggle {
        padding: format!("{} {}", var!(space-md), var!(space-xl));
        flex-shrink: "0";
        margin-top: "auto";
        @media ((max-width: 767px)) {
            display: "none";
        }
    }

    // Optional row in the nav column / drawer for locale switchers or similar
    // widgets, placed between the brand header and the section label.
    pub c_nav_locale_row {
        padding: format!("{} {}", var!(space-md), var!(space-xl));
        flex-shrink: "0";
    }

    pub c_nav_locale_button {
        width: "100%";
        height: "36px";
        padding: "0px";
        cursor: "pointer";
        outline: "none";
        border: format!("1px dashed {}", var!(border));
        background: "transparent";
        color: var!(foreground);
        display: "flex";
        align-items: "center";
        justify-content: "center";
        // The trigger mirrors the sidebar's hover affordance: the dashed
        // border thickens to the foreground colour and a translucent wash
        // derived from the text colour appears behind the label. The wash is
        // `color-mix` on `foreground` rather than `accent-muted`, because in
        // the monochrome palette `accent-muted` resolves to the same value as
        // `background` (white on light, black on dark) and would be invisible.
        :hover {
            border-color: var!(foreground);
            background: format!("color-mix(in srgb, {} 8%, transparent)", var!(foreground));
        }
        :focus-visible {
            outline: "none";
        }
        // `:active` must not reset the hover styles: it only fires while the
        // pointer is held, and zeroing the background there is what made the
        // click look like nothing happened.
        :active {
            border-color: var!(foreground);
            background: format!("color-mix(in srgb, {} 12%, transparent)", var!(foreground));
        }
    }

    // Open state of the locale switcher: the same solid treatment the sidebar
    // gives its current page, so "menu is open" reads as strongly as
    // "this is the page you are on".
    pub c_nav_locale_button_open {
        width: "100%";
        height: "36px";
        padding: "0px";
        cursor: "pointer";
        outline: "none";
        border: format!("1px solid {}", var!(accent));
        display: "flex";
        align-items: "center";
        justify-content: "center";
        // Background and text colour are a matched pair: the fill is the
        // accent, so the label must be the colour that reads on top of it.
        // Setting one without the other is what produces invisible text.
        background: var!(accent);
        color: var!(text-on-accent);
        :hover {
            background: var!(accent);
            color: var!(text-on-accent);
            border-color: var!(accent);
        }
        :focus-visible {
            outline: "none";
        }
        :active {
            background: var!(accent);
            color: var!(text-on-accent);
            border-color: var!(accent);
        }
    }

    pub c_nav_theme_button {
        width: "100%";
        height: "36px";
        padding: "0px";
        cursor: "pointer";
        outline: "none";
        border: format!("1px dashed {}", var!(border));
        display: "flex";
        align-items: "center";
        justify-content: "center";
        :focus-visible {
            outline: "none";
        }
        :active {
            background: "transparent";
            border-color: var!(border);
        }
    }

    pub c_theme_icon_sun {
        width: "20px";
        height: "20px";
        background-repeat: "no-repeat";
        background-position: "center";
        background-size: "20px 20px";
        background-image: "url(\"data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='%23ffffff' stroke='%23ffffff' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='5'/%3E%3Cline x1='12' y1='1' x2='12' y2='4'/%3E%3Cline x1='12' y1='20' x2='12' y2='23'/%3E%3Cline x1='4.22' y1='4.22' x2='6.34' y2='6.34'/%3E%3Cline x1='17.66' y1='17.66' x2='19.78' y2='19.78'/%3E%3Cline x1='1' y1='12' x2='4' y2='12'/%3E%3Cline x1='20' y1='12' x2='23' y2='12'/%3E%3Cline x1='4.22' y1='19.78' x2='6.34' y2='17.66'/%3E%3Cline x1='17.66' y1='6.34' x2='19.78' y2='4.22'/%3E%3C/svg%3E\")";
        transition: format!("transform {} {}", var!(duration-normal), var!(ease-out));
    }

    pub c_theme_icon_moon {
        width: "20px";
        height: "20px";
        background-repeat: "no-repeat";
        background-position: "center";
        background-size: "20px 20px";
        background-image: "url(\"data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='%23000000' stroke='none' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M21 13A9 9 0 1 1 11 3a7 7 0 0 0 10 10z'/%3E%3C/svg%3E\")";
        transition: format!("transform {} {}", var!(duration-normal), var!(ease-out));
    }

    pub c_nav_footer {
        padding: format!("{} {}", var!(space-lg), var!(space-xl));
        position: "relative";
        font-size: var!(font-xs);
        color: var!(muted-foreground);
        flex-shrink: "0";
        text-decoration: "none";
        display: "flex";
        align-items: "center";
        // Center the "Built with X" attribution line inside the sidebar so
        // it visually balances with the centered brand header above and the
        // centered theme toggle divider. `justify-content: center` works
        // here because the link itself is a single row of inline text —
        // when it wraps to multiple lines on narrow sidebars the lines stay
        // grouped because `flex-direction` is the default `row`.
        justify-content: "center";
        gap: var!(space-xs);
        cursor: "pointer";
        text-align: "center";
        transition: format!("opacity {} {}", var!(duration-fast), var!(ease-out));
        opacity: "1";
        :hover {
            opacity: "1";
        }
    }

    pub c_nav_footer_divider {
        position: "absolute";
        top: "0";
        left: var!(space-lg);
        right: var!(space-lg);
        height: "1px";
        background: format!("linear-gradient(90deg, transparent, {}, transparent)", var!(border));
    }

    pub c_nav_footer_text {
        font-weight: "400";
        letter-spacing: "0.02em";
    }

    pub c_nav_footer_brand {
        font-weight: "700";
        color: var!(accent);
    }

    pub c_nav_item_active {
        display: "flex";
        align-items: "center";
        gap: var!(space-sm);
        padding: format!("{} {}", var!(space-md), var!(space-xl));
        text-decoration: "none";
        font-size: var!(font-base);
        color: var!(text-on-accent);
        font-weight: "600";
        background: var!(accent);
    }

    pub c_nav_item_inactive {
        display: "flex";
        align-items: "center";
        gap: var!(space-sm);
        padding: format!("{} {}", var!(space-md), var!(space-xl));
        text-decoration: "none";
        font-size: var!(font-base);
        color: var!(foreground);
        font-weight: "400";
        :hover {
            background: var!(accent-muted);
            color: var!(accent);
            box-shadow: format!("inset 4px 0 0 0 {}", var!(foreground));
        }
    }

    pub c_nav_item_icon {
        flex-shrink: "0";
        width: "20px";
        text-align: "center";
    }

    pub c_nav_item_label {
        flex: "1";
        overflow: "hidden";
        text-overflow: "ellipsis";
        white-space: "nowrap";
        color: "inherit";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Main Content Area
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_app_main {
        flex: "1";
        height: "100%";
        overflow: "auto";
        padding: format!("{} {} {} {}", var!(padding-main-top), var!(padding-main-horizontal), var!(padding-main-bottom), var!(padding-main-horizontal));
        scrollbar-color: format!("{} {}", var!(scrollbar-thumb), var!(scrollbar-track));
        ::-webkit-scrollbar {
            width: "6px";
        }
        ::-webkit-scrollbar-thumb {
            background: var!(scrollbar-thumb);
            border: "none";
            border-radius: "0px";
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var!(scrollbar-thumb-hover);
        }
        ::-webkit-scrollbar-thumb:active {
            background: var!(scrollbar-thumb-active);
        }
        @media ((max-width: 767px)) {
            padding: format!("{} {} {} {}", var!(padding-main-top-mobile), var!(padding-main-horizontal-mobile), var!(padding-main-bottom), var!(padding-main-horizontal-mobile));
            scrollbar-width: "none";
            ::-webkit-scrollbar {
                width: "0px";
            }
        }
    }

    pub c_page_router {
        flex: "1";
        display: "flex";
        flex-direction: "column";
    }

    pub c_page_container {
        width: "100%";
        margin: "0px auto";
        max-width: var!(content-max-width);
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Page Banner (unified header with emoji icon)
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_page {
        position: "relative";
        text-align: "center";
        box-sizing: "border-box";
    }

    pub c_page_glow {
        position: "absolute";
        top: "-50%";
        left: "50%";
        transform: "translateX(-50%)";
        width: "400px";
        max-width: "100%";
        height: "400px";
        pointer-events: "none";
    }

    pub c_page_content {
        position: "relative";
        z-index: "1";
    }

    pub c_page_icon {
        font-size: "36px";
        padding-bottom: var!(space-md);
        @media ((max-width: 767px)) {
            font-size: "40px";
        }
    }

    pub c_page_title {
        font-size: var!(font-4xl);
        font-weight: "800";
        letter-spacing: "-0.03em";
        margin: "0px";
        color: var!(foreground);
        margin-bottom: var!(space-sm);
        @media ((max-width: 767px)) {
            font-size: var!(font-3xl);
        }
    }

    pub c_page_subtitle {
        font-size: var!(font-lg);
        color: var!(muted-foreground);
        margin: "0px auto";
        margin-bottom: var!(space-sm);
        max-width: "560px";
        opacity: "1";
        @media ((max-width: 767px)) {
            font-size: var!(font-base);
        }
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Card Component
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_card {
        color: var!(foreground);
        box-sizing: "border-box";
    }

    pub c_card_title {
        margin: format!("{} 0px", var!(gap-component));
        color: var!(foreground);
        font-size: var!(font-lg);
        font-weight: "600";
        padding-bottom: var!(gap-component);
        border-bottom: format!("1px dashed {}", var!(border));
        letter-spacing: "-0.01em";
        @media ((max-width: 767px)) {
            font-size: var!(font-md);
        }
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Buttons
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_primary_button {
        display: "flex";
        justify-content: "center";
        align-items: "center";
        gap: var!(space-sm);
        width: "100%";
        height: "42px";
        background: var!(accent);
        color: var!(text-on-accent);
        border: "1px solid transparent";
        padding: format!("0px {}", var!(space-2xl));
        cursor: "pointer";
        font-size: var!(font-base);
        font-weight: "500";
        letter-spacing: "0.02em";
        text-align: "center";
        outline: "none";
        box-sizing: "border-box";
        white-space: "nowrap";
        overflow: "hidden";
        text-overflow: "ellipsis";
        user-select: "none";
        -webkit-user-select: "none";
        :focus-visible {
            outline: "none";
        }
        :disabled {
            background: var!(muted-foreground);
            cursor: "not-allowed";
            opacity: "1";
        }
        :hover {
            background: var!(accent);
        }
        :active {
            background: var!(accent);
            color: var!(text-on-accent);
            border-color: "transparent";
        }
        @media ((max-width: 767px)) {
            max-width: "100%";
            padding: format!("{} {}", var!(space-lg), var!(space-xl));
            font-size: var!(font-md);
        }
    }

    pub c_modal_close_button {
        display: "flex";
        justify-content: "center";
        align-items: "center";
        color: "inherit";
        border: "none";
        padding: format!("{} {}", var!(space-sm), var!(space-md));
        cursor: "pointer";
        font-size: "20px";
        font-weight: "400";
        vertical-align: "middle";
        outline: "none";
        opacity: "1";
        flex-shrink: "0";
        transition: format!("opacity {} {}", var!(duration-fast), var!(ease-out));
        :hover {
            opacity: "1";
        }
        :active {
            opacity: "1";
        }
        :focus {
            outline: "none";
        }
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Button Controls Container
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_button_controls {
        display: "flex";
        flex-wrap: "wrap";
        gap: var!(gap-element);
        margin-top: var!(gap-component);
        margin-bottom: var!(gap-component);
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Euv Button Variants
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_euv_button_primary_md {
        display: "flex";
        justify-content: "center";
        align-items: "center";
        gap: var!(space-sm);
        flex: "1 1 120px";
        height: "42px";
        padding: format!("0px {}", var!(space-xl));
        background: var!(accent);
        color: var!(text-on-accent);
        cursor: "pointer";
        font-size: var!(font-base);
        font-weight: "500";
        outline: "none";
        white-space: "nowrap";
        user-select: "none";
        -webkit-user-select: "none";
        box-sizing: "border-box";
        :disabled {
            background: var!(muted-foreground);
            cursor: "not-allowed";
            opacity: "1";
        }
    }

    pub c_euv_button_outline_md {
        display: "flex";
        justify-content: "center";
        align-items: "center";
        gap: var!(space-sm);
        flex: "1 1 120px";
        height: "42px";
        padding: format!("0px {}", var!(space-xl));
        color: var!(foreground);
        border: format!("1px solid {}", var!(border));
        cursor: "pointer";
        font-size: var!(font-base);
        font-weight: "500";
        outline: "none";
        white-space: "nowrap";
        user-select: "none";
        -webkit-user-select: "none";
        box-sizing: "border-box";
        :focus-visible {
            outline: "none";
        }
        :disabled {
            background: var!(muted-foreground);
            cursor: "not-allowed";
            opacity: "1";
        }
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Badges
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_badge {
        display: "inline-flex";
        justify-content: "center";
        align-items: "center";
        color: var!(text-on-accent);
        padding: format!("{} {}", var!(space-2xs), var!(space-sm));
        border: format!("1px solid {}", var!(accent));
        font-size: var!(font-xs);
        font-weight: "600";
        cursor: "pointer";
        text-align: "center";
        background: var!(accent);
        :focus-visible {
            outline: "none";
        }
        @media ((max-width: 767px)) {
            padding: format!("{} {}", var!(space-2xs), var!(space-xs));
            font-size: var!(font-xs);
        }
    }

    pub c_badge_outline {
        display: "inline-flex";
        justify-content: "center";
        align-items: "center";
        color: var!(foreground);
        padding: format!("{} {}", var!(space-2xs), var!(space-sm));
        font-size: var!(font-xs);
        font-weight: "600";
        cursor: "pointer";
        text-align: "center";
        border: format!("1.5px solid {}", var!(border));
        @media ((max-width: 767px)) {
            padding: format!("{} {}", var!(space-2xs), var!(space-xs));
            font-size: var!(font-xs);
        }
    }

    pub c_euv_tag_solid_black {
        display: "inline-block";
        vertical-align: "middle";
        text-align: "center";
        line-height: "1";
        color: var!(text-on-accent);
        padding: format!("{} {}", var!(space-xs), var!(space-md));
        font-size: var!(font-sm);
        font-weight: "600";
        cursor: "pointer";
        background: var!(accent);
        border: format!("1px solid {}", var!(accent));
        box-sizing: "border-box";
    }

    pub c_euv_tag_solid_white {
        display: "inline-block";
        vertical-align: "middle";
        text-align: "center";
        line-height: "1";
        color: var!(foreground);
        padding: format!("{} {}", var!(space-2xs), var!(space-sm));
        font-size: var!(font-xs);
        font-weight: "600";
        cursor: "pointer";
        border: format!("1.5px solid {}", var!(accent));
        box-sizing: "border-box";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Euv Tag Variants (semantic colour tags)
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_euv_tag_outline_black {
        display: "inline-block";
        vertical-align: "middle";
        text-align: "center";
        line-height: "1";
        color: var!(accent);
        padding: format!("{} {}", var!(space-2xs), var!(space-sm));
        font-size: var!(font-xs);
        font-weight: "600";
        cursor: "pointer";
        border: format!("1.5px solid {}", var!(accent));
        box-sizing: "border-box";
    }

    pub c_euv_tag_outline_white {
        display: "inline-block";
        vertical-align: "middle";
        text-align: "center";
        line-height: "1";
        color: var!(foreground);
        padding: format!("{} {}", var!(space-xs), var!(space-md));
        font-size: var!(font-sm);
        font-weight: "600";
        cursor: "pointer";
        border: format!("1.5px solid {}", var!(border));
        box-sizing: "border-box";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Form Elements
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_euv_input_wrapper {
        width: "100%";
        margin: format!("{} 0px", var!(gap-element));
    }

    pub c_form_label {
        display: "block";
        margin-bottom: var!(space-sm);
        color: "inherit";
        font-weight: "500";
        font-size: var!(font-base);
    }

    pub c_inline_input_row {
        display: "flex";
        align-items: "center";
        gap: var!(gap-component);
    }

    pub c_euv_input {
        width: "100%";
        min-height: var!(min-height-base);
        padding: format!("0px {}", var!(space-lg));
        border: format!("1px solid {}", var!(border));
        font-size: var!(font-base);
        line-height: "normal";
        box-sizing: "border-box";
        outline: "none";
        color: var!(foreground);
        appearance: "none";
        -webkit-appearance: "none";
        -moz-appearance: "none";
        vertical-align: "middle";
        :hover {
            border-color: var!(accent);
            background: var!(accent-muted);
        }
        :focus {
            outline: "none";
            border-color: var!(accent);
            background: var!(accent-muted);
        }
    }

    pub c_euv_input_no_transition {
        width: "100%";
        min-height: var!(min-height-base);
        padding: format!("0px {}", var!(space-lg));
        border: format!("1px solid {}", var!(border));
        font-size: var!(font-base);
        line-height: "normal";
        box-sizing: "border-box";
        outline: "none";
        color: var!(foreground);
        appearance: "none";
        -webkit-appearance: "none";
        -moz-appearance: "none";
        vertical-align: "middle";
    }

    pub c_euv_input_error {
        width: "100%";
        min-height: var!(min-height-base);
        padding: format!("0px {}", var!(space-lg));
        border: format!("1px solid {}", var!(foreground));
        font-size: var!(font-base);
        line-height: "normal";
        box-sizing: "border-box";
        outline: "none";
        color: var!(foreground);
        appearance: "none";
        -webkit-appearance: "none";
        -moz-appearance: "none";
        vertical-align: "middle";
        :focus {
            outline: "none";
            border-color: var!(foreground);
        }
    }

    pub c_form_checkbox {
        cursor: "pointer";
        width: var!(space-lg);
        height: var!(space-lg);
    }

    pub c_form_checkbox_label {
        font-size: var!(font-base);
        color: "inherit";
        cursor: "pointer";
    }

    pub c_form_checkbox_row {
        margin: format!("{} 0px", var!(gap-component));
        display: "flex";
        align-items: "center";
        gap: var!(gap-element);
    }

    pub c_select_input {
        width: "100%";
        min-height: var!(min-height-base);
        padding: format!("0px {}", var!(space-lg));
        border: format!("1px solid {}", var!(border));
        font-size: var!(font-base);
        line-height: "normal";
        box-sizing: "border-box";
        outline: "none";
        cursor: "pointer";
        appearance: "none";
        -webkit-appearance: "none";
        -moz-appearance: "none";
        color: var!(foreground);
        vertical-align: "middle";
        background-image: "url(\"data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='currentColor' d='M6 8L1 3h10z'/%3E%3C/svg%3E\")";
        background-repeat: "no-repeat";
        background-position: "right 14px center";
        :focus {
            outline: "none";
            border-color: var!(accent);
            background: var!(accent-muted);
        }
    }

    pub c_textarea_input {
        width: "100%";
        max-width: "100%";
        padding: format!("{} {}", var!(space-md), var!(space-lg));
        border: format!("1px solid {}", var!(border));
        font-size: var!(font-base);
        line-height: "normal";
        box-sizing: "border-box";
        outline: "none";
        resize: "vertical";
        overflow-x: "hidden";
        word-wrap: "break-word";
        font-family: "inherit";
        color: var!(foreground);
        appearance: "none";
        -webkit-appearance: "none";
        -moz-appearance: "none";
        :hover {
            border-color: var!(accent);
            background: var!(accent-muted);
        }
        :focus {
            outline: "none";
            border-color: var!(accent);
            background: var!(accent-muted);
        }
    }

    pub c_textarea_input_error {
        width: "100%";
        max-width: "100%";
        padding: format!("{} {}", var!(space-md), var!(space-lg));
        border: format!("1px solid {}", var!(foreground));
        font-size: var!(font-base);
        line-height: "normal";
        box-sizing: "border-box";
        outline: "none";
        resize: "vertical";
        overflow-x: "hidden";
        word-wrap: "break-word";
        font-family: "inherit";
        color: var!(foreground);
        appearance: "none";
        -webkit-appearance: "none";
        -moz-appearance: "none";
        :focus {
            outline: "none";
            border-color: var!(foreground);
        }
    }

    pub c_textarea_counter {
        text-align: "right";
        margin-top: var!(space-xs);
        margin-bottom: var!(gap-component);
    }

    pub c_textarea_counter_text {
        font-size: var!(font-sm);
        color: "inherit";
        opacity: "1";
    }

    pub c_field_error_text {
        color: var!(foreground);
        font-size: var!(font-base);
        margin-top: var!(space-xs);
        margin-bottom: var!(space-sm);
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Status Boxes
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_error_box {
        margin: format!("{} 0px", var!(gap-component));
        background: var!(accent-muted);
        color: var!(foreground);
        font-size: var!(font-base);
        box-sizing: "border-box";
    }

    pub c_success_box {
        margin: format!("{} 0px", var!(gap-component));
        background: var!(accent-muted);
        color: var!(foreground);
        font-size: var!(font-base);
        box-sizing: "border-box";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Counter / Signals Demo
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_counter_row {
        display: "grid";
        grid-template-columns: "1fr 1fr";
        align-items: "center";
        gap: var!(gap-component);
        @media ((max-width: 767px)) {
            grid-template-columns: "1fr";
        }
    }

    pub c_counter_text {
        font-size: var!(font-base);
        color: "inherit";
        margin-bottom: var!(gap-component);
    }

    pub c_counter_value {
        font-weight: "700";
        color: var!(accent);
        font-size: var!(font-base);
    }

    pub c_counter_value_row {
        margin-top: var!(space-sm);
        word-break: "break-all";
        overflow-wrap: "anywhere";
        font-size: var!(font-base);
        color: "inherit";
        font-weight: "400";
    }

    pub c_badge_row {
        display: "flex";
        gap: var!(gap-inline);
        flex-wrap: "wrap";
        align-items: "center";
    }

    pub c_badge_hint {
        margin-bottom: var!(gap-component);
        color: "inherit";
        opacity: "1";
        font-size: var!(font-base);
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Home Page
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_text_ellipsis {
        overflow: "hidden";
        text-overflow: "ellipsis";
        white-space: "nowrap";
    }

    pub c_info_row {
        display: "flex";
        align-items: "center";
        gap: var!(space-md);
        padding: format!("{} 0", var!(space-sm));
        overflow: "hidden";
    }

    pub c_info_label {
        font-size: var!(font-sm);
        font-weight: "500";
        color: var!(muted-foreground);
        min-width: "72px";
        flex-shrink: "0";
        letter-spacing: "0.02em";
    }

    pub c_info_value {
        c_text_ellipsis();
        font-size: var!(font-base);
        font-weight: "600";
        color: var!(foreground);
        font-family: "ui-monospace, monospace";
        flex: "1";
    }

    pub c_info_link {
        c_text_ellipsis();
        font-size: var!(font-base);
        font-weight: "600";
        color: var!(accent);
        font-family: "ui-monospace, monospace";
        flex: "1";
        text-decoration: "none";
        transition: format!("opacity {} {}", var!(duration-fast), var!(ease-out));
        :hover {
            opacity: "1";
        }
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Camera Page
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_camera_video_container {
        margin: format!("{} 0", var!(space-lg));
    }

    pub c_camera_video_active {
        width: "100%";
        background: "#000";
        aspect-ratio: "16 / 9";
        object-fit: "cover";
        border: format!("2px solid {}", var!(accent));
        box-sizing: "border-box";
    }

    pub c_camera_video_hidden {
        width: "100%";
        aspect-ratio: "16 / 9";
        display: "none";
    }

    pub c_camera_video_placeholder {
        width: "100%";
        aspect-ratio: "16 / 9";
        border: format!("2px dashed {}", var!(border));
        display: "flex";
        align-items: "center";
        justify-content: "center";
        box-sizing: "border-box";
    }

    pub c_camera_placeholder_content {
        display: "flex";
        flex-direction: "column";
        align-items: "center";
        gap: var!(space-md);
    }

    pub c_camera_placeholder_icon {
        font-size: var!(font-4xl);
        opacity: "1";
    }

    pub c_camera_placeholder_text {
        font-size: var!(font-base);
        color: "inherit";
        opacity: "1";
    }

    pub c_camera_error_box {
        margin: format!("{} 0px", var!(gap-component));
        color: var!(foreground);
        font-size: var!(font-base);
        word-break: "break-all";
        overflow-wrap: "break-word";
        box-sizing: "border-box";
    }

    pub c_camera_scan_result_box {
        margin-top: var!(gap-component);
        box-sizing: "border-box";
    }

    pub c_camera_scan_result_label {
        font-size: var!(font-sm);
        font-weight: "600";
        color: var!(foreground);
        margin-bottom: var!(space-xs);
    }

    pub c_camera_scan_result_value {
        font-size: var!(font-base);
        color: "inherit";
        word-break: "break-all";
        overflow-wrap: "break-word";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Canvas Drawing Board
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_canvas_preview_container {
        margin: format!("{} 0", var!(space-lg));
        overflow: "hidden";
        border: format!("2px solid {}", var!(border));
        background: "#ffffff";
        aspect-ratio: "9 / 16";
        display: "flex";
        align-items: "center";
        justify-content: "center";
        box-sizing: "border-box";
    }

    pub c_canvas_placeholder {
        color: var!(muted-foreground);
        font-size: var!(font-sm);
        text-align: "center";
        padding: var!(space-lg);
    }

    pub c_canvas_preview_image {
        width: "100%";
        height: "100%";
        object-fit: "cover";
        display: "block";
    }

    pub c_canvas_container_fullscreen {
        width: "100%";
        height: "100%";
        background: var!(background);
        display: "flex";
        flex-direction: "column";
        position: "fixed";
        top: "0";
        left: "0";
        z-index: "10002";
        padding: format!("{} {} {} {}", var!(padding-shell-top), var!(space-lg), var!(padding-shell-bottom), var!(space-lg));
        box-sizing: "border-box";
    }

    pub c_canvas_drawing_fullscreen_wrapper {
        flex: "1";
        display: "flex";
        align-items: "center";
        justify-content: "center";
        overflow: "hidden";
        padding: var!(space-xs);
    }

    pub c_canvas_drawing_fullscreen {
        border: format!("2px solid {}", var!(border));
        display: "block";
        cursor: "crosshair";
        touch-action: "none";
    }

    pub c_canvas_fullscreen_toolbar {
        display: "flex";
        flex-direction: "column";
        align-items: "stretch";
        width: "100%";
        padding: format!("{} {}", var!(space-xs), "0px");
        flex-shrink: "0";
        gap: var!(space-xs);
    }

    pub c_canvas_fullscreen_toolbar_row_top {
        display: "flex";
        align-items: "center";
        height: var!(mobile-header-height);
        width: "100%";
        gap: var!(space-sm);
    }

    pub c_canvas_fullscreen_toolbar_color_wrapper {
        display: "flex";
        align-items: "center";
        justify-content: "center";
        flex: "1";
        min-width: "0";
    }

    pub c_canvas_color_input_fullscreen {
        width: "100%";
        height: "42px";
        border: format!("1px solid {}", var!(border));
        cursor: "pointer";
        padding: format!("{}", var!(space-xs));
    }

    pub c_canvas_fullscreen_toolbar_row_bottom {
        display: "flex";
        align-items: "center";
        width: "100%";
    }

    pub c_canvas_fullscreen_range_input {
        flex: "1 1 0%";
        min-width: "120px";
        cursor: "pointer";
        -webkit-appearance: "none";
        appearance: "none";
        border: "none";
        outline: "none";
        height: "24px";
        ::-webkit-slider-runnable-track {
            height: "6px";
            background: format!("linear-gradient(to right, {} 0%, {} var(--value,50%), {} var(--value,50%), {} 100%)", var!(foreground), var!(foreground), var!(border), var!(border));
            border-radius: "3px";
            border: "none";
        }
        ::-webkit-slider-thumb {
            width: "20px";
            height: "20px";
            background: var!(background);
            border: format!("2px solid {}", var!(accent));
            border-radius: "50%";
            cursor: "pointer";
            -webkit-appearance: "none";
            margin-top: "-7px";
        }
        ::-moz-range-track {
            height: "6px";
            background: format!("linear-gradient(to right, {} 0%, {} var(--value,50%), {} var(--value,50%), {} 100%)", var!(foreground), var!(foreground), var!(border), var!(border));
            border-radius: "3px";
            border: "none";
        }
        ::-moz-range-thumb {
            width: "20px";
            height: "20px";
            background: var!(background);
            border: format!("2px solid {}", var!(accent));
            border-radius: "50%";
            cursor: "pointer";
        }
    }

    pub c_canvas_fullscreen_toolbar_button {
        flex: "0 0 auto";
        overflow: "hidden";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Game Fullscreen (2D / 3D)
    // ═══════════════════════════════════════════════════════════════════════════

    // Fullscreen overlay container for the 2D and 3D game pages.
    //
    // Mirrors `c_canvas_container_fullscreen` so the safe-area caching
    // pass in `UseEuvLayout::apply_cached_insets` can pick this selector
    // up alongside the canvas one. Differs in that the game overlay holds
    // the *same* `<canvas>` element that the inline page mounts (no
    // canvas re-creation), so the running game loop, balls, cubes, FPS
    // counter and other reactive state survive the fullscreen toggle
    // without reset.
    pub c_game_container_fullscreen {
        width: "100%";
        height: "100%";
        background: var!(background);
        display: "flex";
        flex-direction: "column";
        position: "fixed";
        top: "0";
        left: "0";
        z-index: "10002";
        padding: format!(
        "{} {} {} {}",
        var!(padding-shell-top),
        var!(space-lg),
        var!(padding-shell-bottom),
        var!(space-lg)
        );
        box-sizing: "border-box";
    }

    // Toolbar wrapping the fullscreen exit button on game pages.
    //
    // Game pages only need an `Exit` button here (no color picker / line
    // width control like the canvas drawing board), so the layout is a
    // single horizontal row at the bottom of the overlay.
    pub c_game_fullscreen_toolbar {
        display: "flex";
        align-items: "center";
        justify-content: "flex-end";
        width: "100%";
        padding: format!("{} {} {} {}", var!(space-xs), var!(space-lg), var!(space-xs), var!(space-lg));
        flex-shrink: "0";
        gap: var!(space-sm);
        box-sizing: "border-box";
    }

    // Wrapper that fills the fullscreen game container with the canvas.
    //
    // The game's `<canvas>` backing buffer is 600x400 (3:2). The canvas
    // itself has `width: 100%; height: 100%` so it fills this wrapper
    // exactly, and `object-fit: contain` on the canvas class makes the
    // browser uniformly scale the backing buffer to fit while preserving
    // its 3:2 aspect ratio. Without `object-fit: contain`, the canvas
    // would be stretched to whatever shape the wrapper has, making balls
    // render as horizontally-ovoid ellipses (e.g. on 1280x800 viewports
    // → 1.6:1, slightly squashed vertically). The letterbox bars appear
    // inside the canvas element rather than around an outer wrapper, so
    // the canvas always fills the fullscreen container with the backing
    // buffer uniformly scaled to its native aspect ratio.
    pub c_game_fullscreen_canvas_letterbox {
        position: "relative";
        width: "100%";
        max-width: "100%";
        max-height: "100%";
        height: "100%";
        display: "flex";
        align-items: "center";
        justify-content: "center";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Custom Attrs Demo
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_custom_attrs_demo {
        // Use the theme foreground token (not `inherit`) so the text inside
        // the dynamic demo block stays readable when the block itself
        // applies a user-supplied background (e.g. `background-color: #000000`)
        // that otherwise paints the inherited text the same colour.
        color: var!(foreground);
        box-sizing: "border-box";
    }

    pub c_demo_text {
        color: var!(foreground);
        margin-bottom: var!(gap-component);
    }

    pub c_demo_text_muted {
        color: var!(foreground);
        opacity: "1";
        font-size: var!(font-base);
        margin-bottom: "0px";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Async / Loading States
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_loading_container {
        display: "flex";
        align-items: "center";
        justify-content: "center";
        gap: var!(gap-component);
        margin: format!("{} 0px", var!(gap-component));
        box-sizing: "border-box";
    }

    pub c_spinner {
        width: "28px";
        height: "28px";
        border: format!("3px solid {}", var!(accent-muted));
        border-top: format!("3px solid {}", var!(accent));
        border-radius: "50%";
        flex-shrink: "0";
        animation: "euv-spin 0.8s linear infinite";
    }

    pub c_loading_text_col {
        display: "flex";
        flex-direction: "column";
        gap: var!(space-xs);
    }

    pub c_loading_title {
        color: var!(foreground);
        font-size: var!(font-md);
        font-weight: "500";
    }

    pub c_loading_subtitle {
        color: var!(muted-foreground);
        font-size: var!(font-base);
    }

    pub c_loading_overlay(background: &str) {
        position: "absolute";
        top: "0";
        left: "0";
        width: "100%";
        height: "100%";
        display: "flex";
        flex-direction: "column";
        align-items: "center";
        justify-content: "center";
        gap: var!(gap-component);
        background: background;
        z-index: "1";
        box-sizing: "border-box";
    }

    pub c_error_container {
        display: "flex";
        align-items: "center";
        gap: var!(gap-element);
        margin-top: var!(gap-component);
        box-sizing: "border-box";
    }

    pub c_error_icon {
        width: "20px";
        height: "20px";
        display: "flex";
        align-items: "center";
        justify-content: "center";
        flex-shrink: "0";
        color: var!(foreground);
        font-size: var!(font-sm);
        font-weight: "700";
    }

    pub c_error_text {
        color: var!(foreground);
        font-size: var!(font-base);
    }

    pub c_data_box {
        margin: format!("{} 0px", var!(gap-component));
        box-sizing: "border-box";
    }

    pub c_data_pre {
        color: var!(foreground);
        font-size: var!(font-base);
        margin: "0px";
        white-space: "pre-wrap";
        word-break: "break-all";
        font-family: "ui-monospace, monospace";
    }

    pub c_fetch_hint {
        color: "inherit";
        opacity: "1";
        font-size: var!(font-base);
        margin-bottom: var!(gap-component);
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Conditional Rendering Demo
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_toggle_content {
        margin-top: var!(gap-component);
        color: "inherit";
    }

    pub c_toggle_title {
        margin-top: "0px";
        color: var!(accent);
        font-size: var!(font-md);
    }

    pub c_role_button_row {
        display: "flex";
        flex-wrap: "nowrap";
        gap: var!(gap-element);
        margin-bottom: var!(gap-component);
    }

    pub c_role_guest_text {
        color: var!(foreground);
        font-size: var!(font-base);
    }

    pub c_role_user_text {
        color: var!(foreground);
        font-size: var!(font-base);
    }

    pub c_role_admin_text {
        color: var!(foreground);
        font-size: var!(font-base);
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Tabs
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_tab_bar {
        display: "flex";
        border-bottom: format!("1px dashed {}", var!(border));
        margin-bottom: var!(gap-component);
        gap: var!(gap-element);
        @media ((max-width: 767px)) {
            flex-wrap: "wrap";
        }
    }

    pub c_tab_item_active {
        padding: format!("{} {}", var!(space-md), var!(space-xl));
        cursor: "pointer";
        border-bottom: format!("2px solid {}", var!(accent));
        color: var!(text-on-accent);
        background: var!(accent);
        font-size: var!(font-base);
        font-weight: "500";
        // iOS WebKit: tap on a non-button element inside a scrollable
        // container can be silently dropped because iOS interprets the
        // touch as the start of a scroll gesture and never dispatches the
        // synthetic `click`. `touch-action: manipulation` tells iOS this
        // element only responds to taps and panning — no double-tap-zoom
        // wait, no scroll-gesture disambiguation. `user-select: none`
        // additionally suppresses the iOS text-selection bubble that
        // would otherwise intercept the tap. See ui/src/style/css/fn.rs
        // for the global reset and PR that documents the iOS repro.
        touch-action: "manipulation";
        user-select: "none";
        -webkit-user-select: "none";
    }

    pub c_tab_item_inactive {
        padding: format!("{} {}", var!(space-md), var!(space-xl));
        cursor: "pointer";
        border-bottom: "2px solid transparent";
        color: "inherit";
        font-size: var!(font-base);
        font-weight: "500";
        // iOS WebKit fix — see c_tab_item_active above for the rationale.
        touch-action: "manipulation";
        user-select: "none";
        -webkit-user-select: "none";
        :hover {
            background: var!(accent-muted);
            color: var!(accent);
        }
    }

    pub c_tab_content {
        padding: format!("{} 0px", var!(gap-element));
    }

    pub c_tab_text {
        color: "inherit";
        font-size: var!(font-base);
        margin-bottom: var!(gap-element);
    }

    pub c_tab_text_muted {
        color: "inherit";
        opacity: "1";
        font-size: var!(font-base);
    }

    pub c_tab_text_input {
        color: "inherit";
        font-size: var!(font-base);
        margin-bottom: var!(gap-component);
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // List
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_list_input {
        width: "100%";
        flex: "1";
        height: "42px";
        padding: format!("0px {}", var!(space-lg));
        border: format!("1px solid {}", var!(border));
        font-size: var!(font-base);
        line-height: "normal";
        box-sizing: "border-box";
        outline: "none";
        color: var!(foreground);
        appearance: "none";
        -webkit-appearance: "none";
        -moz-appearance: "none";
        vertical-align: "middle";
        :hover {
            border-color: var!(accent);
            background: var!(accent-muted);
        }
        :focus {
            outline: "none";
            border-color: var!(accent);
            background: var!(accent-muted);
        }
    }

    pub c_list_input_error {
        width: "100%";
        flex: "1";
        height: "42px";
        padding: format!("0px {}", var!(space-lg));
        border: format!("1px solid {}", var!(foreground));
        font-size: var!(font-base);
        line-height: "normal";
        box-sizing: "border-box";
        outline: "none";
        color: var!(foreground);
        appearance: "none";
        -webkit-appearance: "none";
        -moz-appearance: "none";
        vertical-align: "middle";
        :focus {
            outline: "none";
            border-color: var!(foreground);
        }
    }

    pub c_list_error_text {
        color: var!(foreground);
        font-size: var!(font-base);
        margin: format!("{} 0px", var!(gap-element));
    }

    pub c_inline_input_button_wrap {
        flex-shrink: "0";
    }

    pub c_list_ul {
        list-style: "none";
        padding: "0px";
        margin: "0px";
        margin-top: var!(gap-component);
    }

    pub c_list_item {
        display: "flex";
        justify-content: "space-between";
        align-items: "center";
        gap: var!(gap-component);
        min-height: var!(min-height-base);
        margin: format!("{} 0px", var!(gap-element));
    }

    pub c_list_item_text {
        flex: "1";
        overflow: "hidden";
        text-overflow: "ellipsis";
        white-space: "nowrap";
        font-size: var!(font-base);
        color: "inherit";
        min-width: "0";
    }

    pub c_list_item_button {
        max-width: "120px";
        flex-shrink: "0";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Log / Console Display
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_log_container {
        font-family: "ui-monospace, monospace";
        font-size: var!(font-base);
        margin-top: "0px";
        color: var!(foreground);
    }

    pub c_log_item {
        padding: format!("{} 0px", var!(space-sm));
        font-size: var!(font-base);
        color: var!(foreground);
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // 404 Not Found
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_render_count_text {
        font-size: var!(font-base);
        color: "inherit";
        margin-bottom: var!(gap-component);
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Event Demo
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_event_result {
        font-size: var!(font-base);
        color: "inherit";
        margin-top: var!(gap-element);
    }

    pub c_event_highlight {
        font-weight: "600";
        color: var!(accent);
    }

    pub c_event_info_grid {
        display: "grid";
        grid-template-columns: "1fr 1fr";
        gap: var!(gap-element);
        margin-top: var!(gap-component);
        @media ((max-width: 767px)) {
            grid-template-columns: "1fr";
            gap: var!(gap-element);
        }
    }

    pub c_event_info_row {
        display: "flex";
        align-items: "center";
        gap: var!(space-sm);
        overflow: "hidden";
    }

    pub c_event_info_label {
        font-size: var!(font-base);
        font-weight: "600";
        color: var!(foreground);
        flex-shrink: "0";
    }

    pub c_event_info_value {
        c_text_ellipsis();
        font-size: var!(font-base);
        font-weight: "600";
        color: var!(accent);
        font-family: "ui-monospace, monospace";
        flex: "1";
    }

    pub c_event_mouse_area {
        min-height: "120px";
        padding: format!("{} 0px", var!(space-xl));
        border: format!("2px dashed {}", var!(border));
        cursor: "crosshair";
        text-align: "center";
        user-select: "none";
        color: "inherit";
    }

    pub c_event_drag_zone {
        min-height: "100px";
        padding: format!("{} 0px", var!(space-xl));
        border: format!("2px dashed {}", var!(border));
        text-align: "center";
        user-select: "none";
        color: var!(foreground);
    }

    pub c_event_drag_zone_active {
        min-height: "100px";
        padding: format!("{} 0px", var!(space-xl));
        border: format!("2px dashed {}", var!(border));
        text-align: "center";
        user-select: "none";
        color: var!(foreground);
    }

    pub c_event_drag_item {
        display: "inline-block";
        padding: format!("{} {}", var!(space-sm), var!(space-xl));
        background: var!(accent);
        color: var!(text-on-accent);
        font-size: var!(font-base);
        font-weight: "500";
        cursor: "grab";
        margin: var!(space-sm);
    }

    pub c_event_drop_zone {
        border: format!("2px dashed {}", var!(border));
        padding: format!("{} {}", var!(space-4xl), var!(space-xl));
        text-align: "center";
        cursor: "pointer";
    }

    pub c_event_drop_zone_active {
        border: format!("2px dashed {}", var!(accent));
        padding: format!("{} {}", var!(space-4xl), var!(space-xl));
        text-align: "center";
        cursor: "pointer";
        background: var!(accent-muted);
    }

    pub c_event_drop_icon {
        font-size: var!(font-5xl);
        display: "block";
        padding-bottom: var!(space-md);
    }

    pub c_event_drop_text {
        font-size: var!(font-lg);
        font-weight: "500";
        color: "inherit";
        padding-bottom: var!(space-md);
    }

    pub c_event_drop_hint {
        font-size: var!(font-base);
        color: "inherit";
        opacity: "1";
        margin: "0px";
    }

    pub c_event_wheel_zone {
        min-height: "120px";
        padding: format!("{} 0px", var!(space-xl));
        border: format!("2px dashed {}", var!(border));
        text-align: "center";
        overflow: "auto";
        color: var!(foreground);
    }

    pub c_event_clipboard_area {
        color: var!(foreground);
    }

    pub c_event_touch_zone {
        min-height: "120px";
        padding: format!("{} 0px", var!(space-xl));
        border: format!("2px dashed {}", var!(accent));
        text-align: "center";
        touch-action: "none";
        user-select: "none";
        color: var!(accent);
    }

    pub c_event_form_area {
        padding: format!("{} 0px", var!(space-lg));
        color: var!(foreground);
    }

    pub c_event_media_area {
        padding: format!("{} 0px", var!(space-lg));
        color: var!(foreground);
        max-width: "100%";
        overflow: "hidden";
    }

    pub c_event_audio {
        width: "100%";
        max-width: "100%";
    }

    pub c_event_video_area {
        color: var!(foreground);
        width: "100%";
        overflow: "hidden";
    }

    pub c_event_video {
        width: "100%";
        max-width: "100%";
    }

    pub c_event_image_area {
        padding: format!("{} 0px", var!(space-lg));
        color: "inherit";
        width: "100%";
        overflow: "hidden";
        display: "flex";
        flex-direction: "column";
        align-items: "center";
        gap: var!(space-md);
    }

    pub c_event_image {
        width: "200px";
        max-width: "100%";
        object-fit: "contain";
        display: "block";
    }

    pub c_event_url_text {
        text-align: "center";
        font-size: var!(font-sm);
        color: "inherit";
        opacity: "1";
        font-family: "ui-monospace, monospace";
        word-break: "break-all";
        width: "100%";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Timer Demo
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_timer_display {
        text-align: "center";
        padding: var!(space-xl);
        margin: format!("{} 0px", var!(gap-component));
        color: "inherit";
    }

    pub c_timer_value {
        font-size: var!(font-base);
        font-weight: "700";
        color: var!(accent);
        letter-spacing: "0.04em";
        font-family: "ui-monospace, monospace";
    }

    pub c_timer_controls {
        display: "flex";
        flex-wrap: "wrap";
        gap: var!(gap-element);
    }

    pub c_timer_done {
        text-align: "center";
        margin-top: var!(gap-component);
        font-size: var!(font-lg);
        font-weight: "600";
        color: var!(foreground);
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Modal
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_modal_overlay {
        position: "fixed";
        top: "0px";
        left: "0px";
        width: "100%";
        height: "100%";
        background: var!(bg-overlay);
        contain: "layout style paint";
        display: "flex";
        align-items: "center";
        justify-content: "center";
        z-index: "1000";
        animation: format!("euv-fade-in {} {}", var!(duration-modal-overlay), var!(ease-out));
        @media ((max-width: 767px)) {
            align-items: "center";
            justify-content: "center";
        }
    }

    pub c_modal_content {
        background: var!(background);
        padding: "0px";
        max-width: "480px";
        width: "90%";
        animation: format!("euv-scale-in-modal {} {}", var!(duration-modal-content), var!(ease-bounce));
        overflow: "hidden";
        color: var!(foreground);
        box-sizing: "border-box";
        @media ((max-width: 767px)) {
            max-width: "100%";
            width: "calc(100% - 32px)";
            max-height: "85vh";
            overflow-y: "auto";
        }
    }

    pub c_modal_header {
        display: "flex";
        justify-content: "space-between";
        align-items: "center";
        padding: format!("{} {} 0px {}", var!(space-md), var!(space-xl), var!(space-xl));
    }

    pub c_modal_title {
        margin: "0px";
        font-size: var!(font-xl);
        font-weight: "600";
        color: "inherit";
    }

    pub c_modal_body {
        padding: format!("0px {} {} {}", var!(space-xl), var!(space-md), var!(space-xl));
        color: "inherit";
    }

    pub c_modal_actions {
        display: "flex";
        flex-wrap: "wrap";
        gap: var!(space-md);
        margin: format!("{} 0px", var!(space-md));
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Animation Demo
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_anim_fade_in {
        margin-top: var!(gap-component);
        animation: format!("euv-fade-in 0.5s {}", var!(ease-out));
        font-size: var!(font-base);
        color: "inherit";
    }

    pub c_anim_spin_container {
        display: "flex";
        justify-content: "center";
        align-items: "center";
        margin: format!("{} 0px", var!(space-lg));
        min-height: "80px";
    }

    pub c_anim_spin {
        font-size: var!(font-5xl);
        animation: "euv-spin 1.5s linear infinite";
        display: "inline-block";
        @media ((max-width: 767px)) {
            font-size: var!(font-4xl);
        }
    }

    pub c_anim_spin_stopped {
        font-size: var!(font-5xl);
        display: "inline-block";
        opacity: "1";
        @media ((max-width: 767px)) {
            font-size: var!(font-4xl);
        }
    }

    pub c_anim_pulse_container {
        display: "flex";
        justify-content: "center";
        align-items: "center";
        margin: format!("{} 0px", var!(space-lg));
        min-height: "80px";
    }

    pub c_anim_pulse {
        font-size: var!(font-5xl);
        animation: "euv-pulse 1.5s ease-in-out infinite";
        display: "inline-block";
        color: var!(foreground);
        @media ((max-width: 767px)) {
            font-size: var!(font-4xl);
        }
    }

    pub c_anim_pulse_stopped {
        font-size: var!(font-5xl);
        display: "inline-block";
        opacity: "1";
        color: var!(foreground);
        @media ((max-width: 767px)) {
            font-size: var!(font-4xl);
        }
    }

    pub c_progress_container {
        width: "100%";
        height: "12px";
        margin: format!("{} 0px", var!(space-lg));
        overflow: "hidden";
    }

    pub c_progress_bar_running {
        height: "100%";
        background: var!(accent);
        animation: format!("euv-progress 1.6s {} forwards", var!(ease-in-out));
    }

    pub c_progress_bar_stopped {
        height: "100%";
        background: var!(accent);
        width: "0%";
    }

    pub c_anim_scale_box {
        margin: format!("{} 0px", var!(gap-component));
        padding: var!(space-xl);
        background: var!(accent);
        cursor: "pointer";
        transition: format!("transform {} {}", var!(duration-normal), var!(ease-out));
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Browser API Demo
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_browser_api_row {
        display: "grid";
        grid-template-columns: "1fr 1fr";
        gap: var!(gap-component);
        margin-bottom: var!(gap-component);
        @media ((max-width: 767px)) {
            grid-template-columns: "1fr";
        }
    }

    pub c_browser_api_actions {
        display: "flex";
        flex-wrap: "wrap";
        gap: var!(gap-element);
        margin: format!("{} 0px", var!(gap-component));
    }

    pub c_browser_result_box {
        margin-top: var!(gap-component);
        font-size: var!(font-base);
        word-break: "break-all";
        color: "inherit";
    }

    pub c_browser_result_label {
        font-weight: "600";
        color: var!(accent);
    }

    pub c_browser_result_value {
        color: "inherit";
    }

    pub c_browser_info_grid {
        display: "grid";
        gap: var!(gap-component);
        margin-top: var!(gap-component);
        @media ((max-width: 767px)) {
            grid-template-columns: "1fr";
        }
    }

    pub c_browser_info_item {
        display: "flex";
        flex-direction: "column";
        gap: var!(space-xs);
        color: "inherit";
    }

    pub c_browser_info_label {
        font-size: var!(font-sm);
        font-weight: "600";
        color: "inherit";
        opacity: "1";
        text-transform: "uppercase";
        letter-spacing: "0.05em";
    }

    pub c_browser_info_value {
        font-size: var!(font-base);
        color: "inherit";
        word-break: "break-all";
        font-family: "ui-monospace, monospace";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // VConsole Panel
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_vconsole_badge {
        position: "absolute";
        top: "-6px";
        right: "-8px";
        min-width: "18px";
        height: "18px";
        background: var!(background);
        color: var!(foreground);
        font-size: "10px";
        font-weight: "600";
        display: "flex";
        align-items: "center";
        justify-content: "center";
        padding: format!("0px {}", var!(space-xs));
        border: format!("1px solid {}", var!(accent));
        pointer-events: "none";
        transition: format!("transform {} {}, opacity {} {}", var!(duration-normal), var!(ease-out), var!(duration-normal), var!(ease-out));
    }

    pub c_vconsole_overlay {
        position: "fixed";
        top: "0px";
        left: "0px";
        right: "0px";
        bottom: "0px";
        z-index: "10000";
        background: var!(bg-overlay);
        contain: "layout style paint";
        transition: format!("opacity {} {}", var!(duration-overlay), var!(ease-out));
    }

    pub c_vconsole_overlay_hidden {
        opacity: "0";
        pointer-events: "none";
    }

    pub c_vconsole_panel {
        position: "fixed";
        bottom: "0px";
        left: "0px";
        right: "0px";
        height: format!("calc(76vh - {})", var!(safe-area-inset-bottom));
        background: var!(background);
        z-index: "10001";
        display: "flex";
        flex-direction: "column";
        contain: "layout style paint";
        will-change: "transform";
        transition: format!("transform {} {}", var!(duration-overlay), var!(ease-out));
        overflow: "hidden";
        padding: format!("{} {}", var!(padding-main-top), var!(padding-main-horizontal));
        @media ((max-width: 767px)) {
            padding: format!("{} {}", var!(space-md), var!(padding-main-horizontal-mobile));
        }
    }

    pub c_vconsole_panel_closed {
        transform: "translateY(100%)";
        will-change: "auto";
    }

    pub c_vconsole_fab {
        position: "fixed";
        bottom: format!("calc(20px + {})", var!(safe-area-inset-bottom));
        right: var!(padding-main-horizontal);
        z-index: "9999";
        @media ((max-width: 767px)) {
            bottom: format!("calc(16px + {})", var!(safe-area-inset-bottom));
            right: var!(padding-main-horizontal-mobile);
        }
    }

    pub c_vconsole_header {
        display: "flex";
        justify-content: "space-between";
        align-items: "center";
        flex-shrink: "0";
    }

    pub c_vconsole_title {
        color: var!(foreground);
        font-size: var!(font-md);
        font-weight: "600";
        margin: "0px";
        letter-spacing: "0.03em";
        display: "flex";
        align-items: "center";
        gap: var!(space-sm);
    }

    pub c_vconsole_title_dot {
        width: "8px";
        height: "8px";
        background: var!(accent);
        display: "inline-block";
        animation: "euv-pulse 2s ease-in-out infinite";
    }

    pub c_vconsole_header_actions {
        display: "flex";
        gap: var!(space-sm);
        align-items: "center";
    }

    pub c_vconsole_clear_button {
        display: "inline-flex";
        justify-content: "center";
        align-items: "center";
        color: var!(foreground);
        padding: format!("{} {}", var!(space-2xs), var!(space-sm));
        font-size: var!(font-xs);
        font-weight: "600";
        cursor: "pointer";
        text-align: "center";
        border: format!("1.5px solid {}", var!(border));
        margin-left: "auto";
        :focus-visible {
            outline: "none";
        }
    }

    pub c_vconsole_close_button {
        display: "inline-flex";
        justify-content: "center";
        align-items: "center";
        color: var!(foreground);
        padding: format!("{} {}", var!(space-xs), var!(space-md));
        cursor: "pointer";
        font-size: var!(font-sm);
        font-weight: "400";
        text-align: "center";
        white-space: "nowrap";
        user-select: "none";
        -webkit-user-select: "none";
        vertical-align: "middle";
        outline: "none";
        transition: format!("all {} {}", var!(duration-fast), var!(ease-out));
        :hover {
            border-color: var!(foreground);
            color: var!(foreground);
            background: var!(background);
        }
        :focus-visible {
            outline: "none";
        }
        :active {
            background: "transparent";
            color: var!(foreground);
            border-color: var!(border);
        }
    }

    pub c_vconsole_body {
        flex: "1";
        overflow-y: "auto";
        contain: "content";
        padding-bottom: var!(space-md);
        font-family: "ui-monospace, monospace";
        font-size: var!(font-xs);
    }

    pub c_vconsole_log_item {
        display: "flex";
        align-items: "center";
        padding: format!("{} 0px", var!(space-sm));
        border-bottom: format!("1px dashed {}", var!(border));
        color: var!(foreground);
        font-size: var!(font-xs);
        word-break: "break-all";
    }

    pub c_vconsole_empty {
        color: var!(muted-foreground);
        font-size: var!(font-xs);
        text-align: "center";
        padding: format!("{} 0px", var!(space-4xl));
        overflow: "hidden";
    }

    pub c_vconsole_empty_hidden {
        height: "0";
        overflow: "hidden";
        padding: "0";
    }

    pub c_vconsole_log_list {
        overflow: "hidden";
    }

    pub c_vconsole_log_list_hidden {
        height: "0";
        overflow: "hidden";
    }

    pub c_vconsole_count {
        color: var!(muted-foreground);
        font-size: var!(font-sm);
        font-weight: "400";
    }

    pub c_vconsole_filter_bar {
        display: "flex";
        gap: var!(space-sm);
        padding: format!("{} 0px", var!(space-sm));
        border-bottom: format!("1px dashed {}", var!(border));
        flex-shrink: "0";
        align-items: "center";
    }

    pub c_vconsole_filter_badge {
        display: "inline-flex";
        justify-content: "center";
        align-items: "center";
        color: var!(text-on-accent);
        padding: format!("{} {}", var!(space-2xs), var!(space-sm));
        border: format!("1px solid {}", var!(accent));
        font-size: var!(font-xs);
        font-weight: "600";
        cursor: "pointer";
        text-align: "center";
        background: var!(accent);
        :focus-visible {
            outline: "none";
        }
    }

    pub c_vconsole_filter_badge_outline {
        display: "inline-flex";
        justify-content: "center";
        align-items: "center";
        color: var!(foreground);
        padding: format!("{} {}", var!(space-2xs), var!(space-sm));
        font-size: var!(font-xs);
        font-weight: "600";
        cursor: "pointer";
        text-align: "center";
        border: format!("1.5px solid {}", var!(border));
    }

    pub c_vconsole_level_badge {
        padding: format!("{} {}", var!(space-2xs), var!(space-sm));
        font-size: var!(font-xs);
        margin-right: var!(space-sm);
        letter-spacing: "0.05em";
        color: var!(foreground);
        border: "1px solid currentColor";
        wrap: "nowrap";
        flex-shrink: "0";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Mobile Layout
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_mobile_header {
        display: "flex";
        align-items: "center";
        justify-content: "space-between";
        padding: format!("var(--euv-mobile-safe-top, 0px) 0px 0px {}", var!(space-lg));
        height: format!("calc({} + var(--euv-mobile-safe-top, 0px))", var!(mobile-header-height));
        flex-shrink: "0";
        position: "sticky";
        top: "0px";
        z-index: "100";
        contain: "content";
        background: var!(background);
        border-bottom: format!("1px solid {}", var!(border));
    }

    pub c_mobile_header_left {
        display: "flex";
        align-items: "center";
        gap: format!("{}", var!(space-md));
    }

    pub c_mobile_header_logo {
        display: "flex";
        align-items: "center";
        gap: format!("{}", var!(space-sm));
        text-decoration: "none";
        color: var!(foreground);
    }

    pub c_mobile_menu_button {
        width: "40px";
        height: "40px";
        border: "none";
        cursor: "pointer";
        font-size: "22px";
        font-weight: "700";
        display: "flex";
        align-items: "center";
        justify-content: "center";
        color: var!(foreground);
        padding: "0px";
        :active {
            background: "transparent";
            color: var!(foreground);
        }
    }

    pub c_mobile_theme_button {
        width: "40px";
        height: "40px";
        border: "none";
        cursor: "pointer";
        display: "flex";
        align-items: "center";
        justify-content: "center";
        padding: "0px";
        :active {
            background: "transparent";
        }
    }

    pub c_mobile_menu_button_active {
        width: "40px";
        height: "40px";
        border: "none";
        cursor: "pointer";
        font-size: "22px";
        font-weight: "700";
        display: "flex";
        align-items: "center";
        justify-content: "center";
        color: var!(accent);
        padding: "0px";
        :active {
            background: var!(background);
            color: var!(accent);
        }
    }

    pub c_mobile_drawer_close_button {
        width: "32px";
        height: "32px";
        border: "none";
        cursor: "pointer";
        font-size: "18px";
        font-weight: "500";
        display: "flex";
        align-items: "center";
        justify-content: "center";
        color: var!(muted-foreground);
        padding: "0px";
        transition: format!("color {} {}", var!(duration-fast), var!(ease-out));
        :hover {
            color: var!(foreground);
        }
        :active {
            color: var!(muted-foreground);
        }
    }

    pub c_mobile_overlay {
        position: "fixed";
        top: "0px";
        left: "0px";
        width: "100%";
        height: "100%";
        background: var!(bg-overlay);
        z-index: "200";
        contain: "layout style paint";
        transition: format!("opacity {} {}", var!(duration-overlay), var!(ease-out));
    }

    pub c_mobile_overlay_hidden {
        opacity: "0";
        pointer-events: "none";
    }

    pub c_mobile_nav_drawer {
        position: "fixed";
        top: "0px";
        left: "0px";
        width: "240px";
        max-width: "100%";
        height: "100%";
        background: var!(background);
        z-index: "201";
        display: "flex";
        flex-direction: "column";
        padding-top: "var(--euv-mobile-safe-top, 0px)";
        padding-bottom: var!(padding-shell-bottom);
        contain: "layout style paint";
        will-change: "transform";
        transition: format!("transform {} {}", var!(duration-overlay), var!(ease-out));
        overflow: "hidden";
    }

    pub c_mobile_nav_drawer_closed {
        transform: "translateX(-100%)";
    }

    pub c_mobile_nav_drawer_header {
        display: "flex";
        align-items: "center";
        justify-content: "space-between";
        padding: format!("0px {}", var!(space-lg));
        height: var!(mobile-header-height);
        flex-shrink: "0";
        position: "relative";
        ::after {
            content: "''";
            position: "absolute";
            bottom: "0px";
            left: var!(space-lg);
            right: var!(space-lg);
            height: "1px";
            background: format!("linear-gradient(90deg, transparent, {}, transparent)", var!(border));
        }
    }

    pub c_mobile_main {
        c_app_main();
        ::-webkit-scrollbar {
            width: "0px";
        }
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Keep-Alive Demo
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_keep_alive_tab_bar {
        display: "flex";
        border-bottom: format!("1px dashed {}", var!(border));
        margin-bottom: var!(gap-component);
        gap: var!(gap-element);
    }

    pub c_keep_alive_tab_panel {
        padding: format!("{} 0px", var!(gap-element));
    }

    pub c_keep_alive_panel_title {
        margin-top: "0px";
        color: var!(accent);
        font-size: var!(font-md);
        margin-bottom: var!(gap-element);
    }

    pub c_keep_alive_demo_text {
        color: "inherit";
        font-size: var!(font-base);
        margin-bottom: var!(gap-component);
    }

    pub c_keep_alive_counter_display {
        display: "flex";
        justify-content: "center";
        align-items: "center";
        margin: format!("{} 0px", var!(space-xl));
    }

    pub c_keep_alive_counter_value {
        font-size: var!(font-base);
        font-weight: "700";
        font-variant-numeric: "tabular-nums";
        color: var!(accent);
        text-align: "center";
    }

    pub c_keep_alive_counter_controls {
        display: "flex";
        flex-wrap: "wrap";
        gap: format!("{}", var!(space-md));
    }

    pub c_keep_alive_form_group {
        margin-bottom: var!(gap-component);
    }

    pub c_keep_alive_form_preview {
        margin-top: var!(gap-component);
        background: var!(accent-muted);
    }

    pub c_keep_alive_preview_label {
        font-size: var!(font-base);
        font-weight: "600";
        color: var!(accent);
        margin: format!("0px 0px {} 0px", var!(space-xs));
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // File Upload
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_file_upload_input_hidden {
        position: "absolute";
        width: "1px";
        height: "1px";
        padding: "0px";
        margin: "-1px";
        overflow: "hidden";
        clip: "rect(0, 0, 0, 0)";
        white-space: "nowrap";
        border: "0px";
    }

    pub c_file_upload_options {
        margin: format!("{} 0px", var!(gap-component));
    }

    pub c_file_upload_item {
        display: "flex";
        align-items: "center";
        gap: format!("{}", var!(space-md));
        margin: format!("{} 0px", var!(space-sm));
        font-size: var!(font-base);
        color: "inherit";
    }

    pub c_file_upload_item_index {
        font-size: var!(font-sm);
        font-weight: "600";
        color: var!(accent);
        min-width: "24px";
    }

    pub c_file_upload_item_name {
        color: "inherit";
        word-break: "break-all";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Binding Demo
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_binding_child_box {
        display: "flex";
        flex-direction: "column";
        gap: var!(gap-component);
        margin-top: var!(gap-component);
    }

    pub c_binding_child_label {
        font-size: var!(font-base);
        font-weight: "600";
        color: var!(accent);
        text-transform: "uppercase";
        letter-spacing: "0.05em";
    }

    pub c_binding_parent_box {
        display: "flex";
        flex-direction: "column";
        gap: var!(gap-component);
        margin-top: var!(gap-component);
    }

    pub c_binding_section_title {
        margin-top: var!(gap-component);
        margin-bottom: var!(gap-element);
        color: var!(accent);
        font-size: var!(font-md);
        font-weight: "600";
    }

    pub c_binding_temp_converter {
        display: "flex";
        align-items: "flex-end";
        gap: var!(gap-component);
        flex-wrap: "wrap";
        margin-top: var!(gap-component);
    }

    pub c_binding_temp_field {
        flex: "1";
        min-width: "120px";
    }

    pub c_binding_temp_arrow {
        font-size: "20px";
        font-weight: "700";
        color: var!(accent);
        padding-bottom: "10px";
    }

    pub c_binding_color_mixer {
        margin-top: var!(gap-component);
    }

    pub c_binding_color_preview {
        width: "100%";
        height: "80px";
        display: "flex";
        align-items: "center";
        justify-content: "center";
        margin-bottom: var!(gap-component);
    }

    pub c_binding_color_hex {
        font-family: "ui-monospace, monospace";
        font-size: var!(font-xl);
        font-weight: "700";
        color: var!(text-on-accent);
        letter-spacing: "0.02em";
    }

    pub c_binding_slider_row {
        display: "flex";
        align-items: "center";
        gap: format!("{}", var!(space-md));
        margin-bottom: var!(space-sm);
    }

    pub c_binding_slider_label {
        font-size: var!(font-base);
        font-weight: "700";
        min-width: var!(font-sm);
    }

    pub c_binding_slider {
        flex: "1";
        height: "24px";
        padding: "0px";
        cursor: "pointer";
        -webkit-appearance: "none";
        appearance: "none";
        border: "none";
        outline: "none";
        ::-webkit-slider-runnable-track {
            height: "6px";
            background: format!("linear-gradient(to right, {} 0%, {} var(--value,50%), {} var(--value,50%), {} 100%)", var!(foreground), var!(foreground), var!(border), var!(border));
            border-radius: "3px";
            border: "none";
        }
        ::-webkit-slider-thumb {
            width: "20px";
            height: "20px";
            background: var!(background);
            border: format!("2px solid {}", var!(accent));
            border-radius: "50%";
            cursor: "pointer";
            -webkit-appearance: "none";
            margin-top: "-7px";
        }
        : active::-webkit-slider-thumb {
            transform: "scale(0.92)";
        }
        ::-moz-range-track {
            height: "6px";
            background: format!("linear-gradient(to right, {} 0%, {} var(--value,50%), {} var(--value,50%), {} 100%)", var!(foreground), var!(foreground), var!(border), var!(border));
            border-radius: "3px";
            border: "none";
        }
        ::-moz-range-thumb {
            width: "20px";
            height: "20px";
            background: var!(background);
            border: format!("2px solid {}", var!(accent));
            border-radius: "50%";
            cursor: "pointer";
        }
        : active::-moz-range-thumb {
            transform: "scale(0.92)";
        }
    }

    pub c_binding_slider_value {
        font-size: var!(font-base);
        font-weight: "500";
        color: "inherit";
        min-width: "32px";
        text-align: "right";
        font-family: "ui-monospace, monospace";
    }

    pub c_binding_typed_prop_value {
        font-family: "ui-monospace, monospace";
        font-size: var!(font-base);
        font-weight: "600";
        color: var!(accent);
        padding: format!("1px {}", var!(space-sm));
    }

    pub c_binding_typed_prop_group {
        display: "flex";
        align-items: "center";
        gap: var!(space-sm);
    }

    pub c_binding_typed_warning {
        font-size: var!(font-base);
        font-weight: "500";
        color: var!(foreground);
        margin-bottom: "0px";
    }

    pub c_binding_form_label {
        display: "block";
        color: "inherit";
        font-weight: "500";
        font-size: var!(font-base);
    }

    pub c_binding_demo_text {
        color: "inherit";
        margin: "0px"
    }

    pub c_binding_compact_button {
        display: "inline-flex";
        justify-content: "center";
        align-items: "center";
        height: "42px";
        padding: format!("0px {}", var!(space-md));
        background: var!(accent);
        color: var!(text-on-accent);
        border: format!("1px solid {}", var!(accent));
        cursor: "pointer";
        font-size: var!(font-sm);
        font-weight: "600";
        outline: "none";
        white-space: "nowrap";
        user-select: "none";
        -webkit-user-select: "none";
        box-sizing: "border-box";
        :hover {
            background: var!(accent);
        }
        :focus-visible {
            outline: "none";
        }
        :active {
            background: var!(accent);
            color: var!(text-on-accent);
            border-color: var!(accent);
        }
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Custom Attrs - Dynamic Style
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_attrs_dynamic_demo(prop_key: &str, prop_value: &str) {
        {
            prop_key
        }
        : prop_value;
        // No layout defaults: this class lives on a `<p>` whose own margin /
        // spacing is controlled by its parent's typography rules, and pinning
        // any colour here would shadow the user-supplied dynamic property.
        // Users are expected to set `color` / `background` / `font-*` /
        // etc. via the two CSS Property Key / Value inputs above; whatever
        // they type becomes the literal CSS rule applied to the paragraph.
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Dynamic Component Demo
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_dynamic_component_tab_bar {
        display: "flex";
        flex-wrap: "wrap";
        gap: var!(gap-element);
        margin-bottom: var!(gap-component);
    }

    pub c_dynamic_component_panel {
        display: "block";
        min-height: var!(min-height-sm);
        margin-top: var!(gap-component);
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Virtual List
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_virtual_list_status {
        display: "flex";
        gap: var!(gap-component);
        padding: format!("{} 0px", var!(gap-component));
        flex-wrap: "nowrap";
        overflow: "hidden";
        text-overflow: "ellipsis";
        white-space: "nowrap";
        @media ((max-width: 767px)) {
            gap: var!(gap-component-mobile);
        }
    }

    pub c_virtual_list_status_item {
        font-size: var!(font-base);
        color: "inherit";
        overflow: "hidden";
        text-overflow: "ellipsis";
        white-space: "nowrap";
    }

    pub c_virtual_list_status_value {
        font-weight: "700";
        color: var!(accent);
        font-family: "ui-monospace, monospace";
    }

    pub c_virtual_list_container {
        flex: "1";
        height: "666px";
        max-height: "666px";
        overflow-y: "auto";
    }

    pub c_virtual_list_card {
        flex: "1";
        padding: var!(space-xl);
        color: var!(foreground);
        display: "flex";
        flex-direction: "column";
        @media ((max-width: 767px)) {
            padding: var!(space-lg);
        }
    }

    pub c_virtual_list_row {
        display: "flex";
        align-items: "center";
        gap: var!(space-lg);
        height: "100%";
        box-sizing: "border-box";
    }

    pub c_virtual_list_row_index {
        min-width: "36px";
        font-size: var!(font-sm);
        font-weight: "600";
        color: var!(accent);
        font-family: "ui-monospace, monospace";
        flex-shrink: "0";
        display: "flex";
        align-items: "center";
    }

    pub c_virtual_list_row_label {
        font-size: var!(font-base);
        font-weight: "500";
        color: "inherit";
        min-width: "120px";
        flex-shrink: "0";
        overflow: "hidden";
        text-overflow: "ellipsis";
        white-space: "nowrap";
        display: "flex";
        align-items: "center";
    }

    pub c_virtual_list_row_description {
        font-size: var!(font-base);
        color: "inherit";
        opacity: "1";
        overflow: "hidden";
        text-overflow: "ellipsis";
        white-space: "nowrap";
        flex: "1";
        display: "flex";
        align-items: "center";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Unified Layout Primitives
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_element_stack {
        display: "flex";
        flex-direction: "column";
        gap: var!(gap-element);
    }

    pub c_switcher {
        display: "flex";
        gap: var!(gap-component);
        flex-wrap: "wrap";
        @media ((max-width: 767px)) {
            flex-direction: "column";
            gap: var!(gap-component-mobile);
        }
    }

    pub c_switcher_col {
        flex: "1";
        min-width: "200px";
        @media ((max-width: 767px)) {
            min-width: "100%";
        }
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Unified Description / Hint Text
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_hint {
        color: "inherit";
        opacity: "1";
        font-size: var!(font-base);
        margin-bottom: var!(gap-component);
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Network Demo
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_net_messages_empty {
        color: "inherit";
        opacity: "1";
        padding: var!(space-xl);
        text-align: "center";
        font-size: var!(font-base);
    }

    pub c_net_messages_list {
        display: "flex";
        flex-direction: "column";
        gap: var!(space-xs);
    }

    pub c_net_message_item {
        display: "flex";
        align-items: "baseline";
        gap: var!(gap-element);
        justify-content: "space-between";
    }

    pub c_net_message_index {
        color: var!(accent);
        font-size: var!(font-sm);
        font-weight: "600";
        white-space: "nowrap";
        flex-shrink: "0";
    }

    pub c_net_message_data {
        color: "inherit";
        font-size: var!(font-base);
        word-break: "break-all";
        overflow-wrap: "break-word";
        flex: "1";
        min-width: "0";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // WebSocket Demo
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_ws_message_input {
        width: "100%";
        flex: "1";
        height: "42px";
        padding: format!("0px {}", var!(space-lg));
        color: var!(foreground);
        border: format!("1px solid {}", var!(border));
        font-size: var!(font-base);
        line-height: "normal";
        box-sizing: "border-box";
        outline: "none";
        appearance: "none";
        -webkit-appearance: "none";
        -moz-appearance: "none";
        vertical-align: "middle";
        :hover {
            border-color: var!(accent);
            background: var!(accent-muted);
        }
        :focus {
            outline: "none";
            border-color: var!(accent);
            background: var!(accent-muted);
        }
    }

    pub c_ws_message_time {
        color: var!(foreground);
        font-size: var!(font-sm);
        white-space: "nowrap";
        flex-shrink: "0";
        margin-left: "auto";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Sticky & CSS Effects Demo
    // ═══════════════════════════════════════════════════════════════════════════

    // ═══════════════════════════════════════════════════════════════════════════
    // Home Page — Section
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_home {
        position: "relative";
        text-align: "center";
        margin-bottom: var!(space-xl);
        flex: "1";
        display: "flex";
        flex-direction: "column";
        justify-content: "center";
        @media ((max-width: 767px)) {
            margin-bottom: var!(space-lg);
            flex: "0 0 auto";
            justify-content: "flex-start";
        }
    }

    pub c_home_content {
        position: "relative";
        z-index: "1";
    }

    pub c_home_badge_row {
        display: "inline-flex";
        align-items: "center";
        gap: var!(space-sm);
        margin-bottom: var!(space-md);
    }

    pub c_home_badge {
        display: "inline-flex";
        justify-content: "center";
        align-items: "center";
        padding: format!("{} {}", var!(space-xs), var!(space-sm));
        color: var!(accent);
        font-size: var!(font-xs);
        font-weight: "600";
        letter-spacing: "0.05em";
        border: format!("1px solid {}", var!(accent));
    }

    pub c_home_title {
        font-size: var!(font-5xl);
        font-weight: "800";
        letter-spacing: "-0.03em";
        margin: "0px";
        color: var!(foreground);
        margin-bottom: var!(space-xs);
        @media ((max-width: 767px)) {
            font-size: var!(font-4xl);
        }
    }

    pub c_home_subtitle {
        font-size: var!(font-lg);
        color: var!(foreground);
        margin: "0px auto";
        max-width: "520px";
        margin-bottom: var!(space-lg);
        @media ((max-width: 767px)) {
            font-size: var!(font-base);
        }
    }

    pub c_home_actions {
        display: "flex";
        gap: var!(space-md);
        justify-content: "center";
        flex-wrap: "wrap";
    }

    pub c_home_btn_primary {
        display: "inline-flex";
        justify-content: "center";
        align-items: "center";
        gap: var!(space-sm);
        padding: format!("{} {}", var!(space-sm), var!(space-2xl));
        background: var!(accent);
        color: var!(text-on-accent);
        font-size: var!(font-base);
        font-weight: "600";
        text-decoration: "none";
        border: "1.5px solid transparent";
        cursor: "pointer";
        letter-spacing: "0.01em";
        vertical-align: "middle";
        min-height: var!(min-height-sm);
        :focus-visible {
            outline: "none";
        }
        :active {
            background: var!(accent);
            color: var!(text-on-accent);
            border-color: "1.5px solid transparent";
        }
    }

    pub c_home_btn_secondary {
        display: "inline-flex";
        justify-content: "center";
        align-items: "center";
        gap: var!(space-sm);
        padding: format!("{} {}", var!(space-sm), var!(space-2xl));
        color: var!(accent);
        font-size: var!(font-base);
        font-weight: "600";
        text-decoration: "none";
        border: format!("1.5px solid {}", var!(accent));
        cursor: "pointer";
        letter-spacing: "0.01em";
        vertical-align: "middle";
        min-height: var!(min-height-sm);
        :focus-visible {
            outline: "none";
        }
        :active {
            background: "transparent";
            color: var!(accent);
            border-color: var!(accent);
        }
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Home Page — Stats Row
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_home_stats {
        display: "grid";
        grid-template-columns: "repeat(4, 1fr)";
        gap: var!(space-md);
        margin-bottom: var!(space-xl);
        @media ((max-width: 767px)) {
            grid-template-columns: "repeat(2, 1fr)";
            gap: var!(space-sm);
        }
    }

    pub c_home_stat_card {
        display: "flex";
        flex-direction: "column";
        align-items: "center";
        justify-content: "center";
        gap: var!(space-xs);
    }

    pub c_home_stat_icon {
        font-size: var!(font-2xl);
    }

    pub c_home_stat_value {
        font-size: var!(font-xl);
        font-weight: "800";
        color: var!(foreground);
        letter-spacing: "-0.01em";
    }

    pub c_home_stat_label {
        font-size: var!(font-sm);
        color: var!(muted-foreground);
        font-weight: "500";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Home Page — Section & Feature Cards
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_home_section_title {
        font-size: var!(font-2xl);
        font-weight: "700";
        color: var!(foreground);
        margin: "0px";
        margin: format!("{} 0px", var!(gap-component));
        letter-spacing: "-0.02em";
    }

    pub c_home_section_desc {
        font-size: var!(font-base);
        color: var!(foreground);
        margin: "0px";
        margin-bottom: var!(space-2xl);
    }

    pub c_home_feature_grid {
        display: "grid";
        grid-template-columns: "repeat(2, 1fr)";
        gap: var!(space-md);
        @media ((max-width: 767px)) {
            grid-template-columns: "1fr";
        }
    }

    pub c_feature_card {
        display: "flex";
        flex-direction: "column";
        gap: var!(space-sm);
        padding: "0px";
        overflow: "hidden";
    }

    pub c_feature_header {
        display: "flex";
        align-items: "center";
        gap: var!(space-sm);
    }

    pub c_feature_icon {
        font-size: var!(font-2xl);
        display: "flex";
        align-items: "center";
        justify-content: "center";
        line-height: "1";
        flex-shrink: "0";
    }

    pub c_feature_name {
        font-size: var!(font-lg);
        font-weight: "600";
        color: var!(foreground);
        margin: "0px";
        overflow: "hidden";
        text-overflow: "ellipsis";
        white-space: "nowrap";
    }

    pub c_feature_desc {
        font-size: var!(font-sm);
        color: var!(foreground);
        margin: "0px";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // Global Utilities
    // ═══════════════════════════════════════════════════════════════════════════

    // Dev-only readouts produced by `euv_debug`. The base wrapper
    // establishes the inline-flex layout so the label and the value
    // share a baseline; the `code` / `pre` value elements apply
    // monospace font and wrap behaviour for the two modes
    // (`expanded: false` = single-line `code`, `expanded: true` =
    // multi-line `pre`).
    pub c_debug {
        display: "flex";
        flex-direction: "row";
        align-items: "baseline";
        gap: var!(space-sm);
        padding: var!(space-xs);
        border: format!("1px dashed {}", var!(accent-muted));
        border-radius: var!(radius-sm);
        background: var!(surface-muted);
        font-family: "ui-monospace, SFMono-Regular, monospace";
        font-size: var!(font-sm);
        color: var!(foreground);
        margin: format!("{} 0px", var!(space-xs));
    }

    pub c_debug_label {
        font-weight: "600";
        color: var!(accent);
        flex-shrink: "0";
    }

    pub c_debug_value {
        font-family: "ui-monospace, SFMono-Regular, monospace";
        color: var!(foreground);
        margin: "0px";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // euv_navbar
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_euv_navbar {
        position: "fixed";
        top: "0px";
        left: "0px";
        right: "0px";
        height: "56px";
        display: "flex";
        align-items: "center";
        gap: var!(gap-element);
        padding: format!("0px {}", var!(padding-main-horizontal));
        border-bottom: format!("1px solid {}", var!(border));
        background: var!(background);
        z-index: "100";
        @media ((max-width: 767px)) {
            padding: format!("0px {}", var!(padding-main-horizontal-mobile));
        }
    }

    pub c_euv_navbar_brand {
        display: "flex";
        align-items: "center";
        gap: var!(gap-element);
        font-size: var!(font-lg);
        font-weight: "700";
        letter-spacing: "-0.02em";
        color: var!(foreground);
        cursor: "pointer";
        flex-shrink: "0";
    }

    pub c_euv_navbar_logo {
        width: "32px";
        height: "32px";
        display: "flex";
        align-items: "center";
        justify-content: "center";
        background: var!(accent);
        color: var!(text-on-accent);
        font-size: var!(font-lg);
        flex-shrink: "0";
    }

    pub c_euv_navbar_links {
        display: "flex";
        align-items: "center";
        gap: var!(gap-section);
        margin-left: "auto";
        @media ((max-width: 767px)) {
            display: "none";
        }
    }

    pub c_euv_navbar_link {
        font-size: var!(font-sm);
        font-weight: "500";
        color: var!(foreground);
        padding: format!("{} {}", var!(space-xs), var!(space-sm));
        border-bottom: "2px solid transparent";
        cursor: "pointer";
        :hover {
            color: var!(accent);
        }
    }

    pub c_euv_navbar_link_active {
        font-size: var!(font-sm);
        font-weight: "600";
        color: var!(accent);
        padding: format!("{} {}", var!(space-xs), var!(space-sm));
        border-bottom: format!("2px solid {}", var!(accent));
        cursor: "pointer";
    }

    pub c_euv_navbar_actions {
        display: "flex";
        align-items: "center";
        gap: var!(gap-element);
        margin-left: var!(gap-section);
        @media ((max-width: 767px)) {
            margin-left: "auto";
        }
    }

    pub c_euv_navbar_icon_button {
        width: "36px";
        height: "36px";
        display: "flex";
        align-items: "center";
        justify-content: "center";
        border: format!("1px dashed {}", var!(border));
        cursor: "pointer";
        font-size: var!(font-base);
        :hover {
            background: var!(accent-muted);
        }
    }

    pub c_euv_navbar_menu_button {
        display: "none";
        width: "40px";
        height: "40px";
        align-items: "center";
        justify-content: "center";
        font-size: var!(font-xl);
        cursor: "pointer";
        transition: format!("background {} {}", var!(duration-fast), var!(ease-out));
        @media ((max-width: 767px)) {
            display: "flex";
        }
    }

    pub c_euv_navbar_menu_button_active {
        display: "none";
        width: "40px";
        height: "40px";
        align-items: "center";
        justify-content: "center";
        font-size: var!(font-xl);
        cursor: "pointer";
        background: var!(accent-muted);
        transition: format!("background {} {}", var!(duration-fast), var!(ease-out));
        @media ((max-width: 767px)) {
            display: "flex";
        }
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // euv_dropdown
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_euv_dropdown {
        position: "relative";
    }

    pub c_euv_dropdown_menu {
        position: "absolute";
        top: "44px";
        right: "0px";
    /* `width: 100%` instead of `min-width: 140px` so the menu
                                                                                                                                                           matches the dropdown container (and therefore the
                                                                                                                                                           trigger button) width exactly. With only `min-width`,
                                                                                                                                                           a trigger wider than 140px (e.g. the 206px-wide
                                                                                                                                                           nav-column locale switcher button) leaves a large
                                                                                                                                                           empty gap on the left of the menu, since `right: 0`
                                                                                                                                                           anchors only the right edge to the container. With
                                                                                                                                                           `width: 100%`, the menu's left edge lines up with the
                                                                                                                                                           trigger's left edge. The default minimum content width
                                                                                                                                                           is still guaranteed by the inner items' own padding,
                                                                                                                                                           so we keep the rule without an explicit min. */
        width: "100%";
        background: var!(background);
        border: format!("1px solid {}", var!(border));
        box-shadow: var!(shadow-accent-lg);
        flex-direction: "column";
        z-index: "101";
    }

    pub c_euv_dropdown_menu_open {
        display: "flex";
    }

    pub c_euv_dropdown_menu_closed {
        display: "none";
    }

    pub c_euv_dropdown_item {
        padding: format!("{} {}", var!(space-sm), var!(space-lg));
        font-size: var!(font-sm);
        text-align: "left";
        cursor: "pointer";
        // Hover mirrors the sidebar's affordance (see `c_euv_sidebar_link`):
        // an inset 3px bar painted inside the padding box, which never
        // participates in layout and therefore never shifts the label. A
        // translucent wash is deliberately NOT used — `accent-muted` resolves
        // to the same value as `background` in the monochrome palette
        // (white on light, black on dark), so a background there is
        // invisible. `color-mix` derives the wash from the actual text colour
        // so it reads in both themes.
        :hover {
            background: format!("color-mix(in srgb, {} 8%, transparent)", var!(foreground));
            box-shadow: format!("inset 3px 0 0 0 {}", var!(foreground));
        }
    }

    pub c_euv_dropdown_item_active {
        padding: format!("{} {}", var!(space-sm), var!(space-lg));
        font-size: var!(font-sm);
        text-align: "left";
        cursor: "pointer";
        font-weight: "600";
        // The selected item wears the accent fill and the text colour that
        // reads on top of it, the same pairing the sidebar's `_active` link
        // uses. The inset bar is dropped: the full-width fill already carries
        // the current-page signal, and a bar in the same monochrome accent
        // would be invisible against it.
        background: var!(accent);
        color: var!(text-on-accent);
        :hover {
            background: var!(accent);
            color: var!(text-on-accent);
            box-shadow: "none";
        }
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // euv_sidebar
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_euv_sidebar_group {
        margin-bottom: var!(space-xs);
    }

    pub c_euv_sidebar_group_title {
        display: "flex";
        align-items: "center";
        justify-content: "space-between";
        width: "100%";
        // Symmetric horizontal padding so the text and the dashed border of
        // any nested children line up on the left edge (see sidebar_children
        // below). Left padding equals `border-left-width + padding-left` of
        // the children container — that's the "text and the dashed border
        // share the same x" requirement.
        padding: format!("{} {}", var!(space-md), var!(space-md));
        font-size: var!(font-base);
        font-weight: "400";
        cursor: "pointer";
        text-align: "left";
        // Hover: inset 3px shadow bar between the dashed tree guide and the
        // title text. Using `box-shadow inset` instead of a real border
        // avoids any layout change so the text x-position never moves on
        // hover (see comment on `c_euv_sidebar_link:hover`).
        :hover {
            box-shadow: format!("inset 3px 0 0 0 {}", var!(foreground));
        }
    }

    pub c_euv_sidebar_group_title_active {
        background: var!(accent);
        color: var!(text-on-accent);
        font-weight: "600";
        :hover {
            box-shadow: "none";
        }
    }

    pub c_euv_sidebar_group_arrow {
        font-size: var!(font-xs);
        color: var!(muted-foreground);
        transition: format!("transform {} {}", var!(duration-fast), var!(ease-out));
    }

    pub c_euv_sidebar_group_arrow_open {
        transform: "rotate(90deg)";
    }

    pub c_euv_sidebar_group_arrow_active {
        color: var!(text-on-accent);
    }

    pub c_euv_sidebar_children {
        display: "flex";
        flex-direction: "column";
        // Compact nesting: keep the dashed tree guide on the left of every
        // nesting level, but trim its indent so the child's text sits just
        // to the right of the dashed border instead of a full 33px gutter
        // away (the old `margin-left: 20px` + `padding-left: 12px` setup).
        // The numbers chosen (margin 8 + border 1 + padding 8 = 17px) are
        // large enough to read as a distinct level but small enough that
        // three-deep trees still fit in a 248–320px sidebar.
        margin-left: var!(space-sm);
        padding-left: var!(space-sm);
        border-left: format!("1px dashed {}", var!(border));
        animation: format!("euv-fade-in {} {}", var!(duration-normal), var!(ease-out));
    }

    pub c_euv_sidebar_link {
        display: "block";
        padding: format!("{} {}", var!(space-md), var!(space-md));
        font-size: var!(font-base);
        color: var!(foreground);
        font-weight: "400";
        cursor: "pointer";
        // Hover: paint a 3px solid bar *between* the dashed tree guide and
        // the link's text. We use `inset box-shadow` rather than a real
        // `border-left` because borders participate in the box's layout
        // (they grow the border-edge and require compensating padding to
        // keep the text x-position stable — and `calc(12px + 3px - 3px)`
        // rounds inconsistently across browsers, causing sub-pixel text
        // shifts on hover). An inset shadow is painted *inside* the
        // existing padding box without changing layout, so the text never
        // moves. The dashed parent border is also untouched.
        :hover {
            box-shadow: format!("inset 3px 0 0 0 {}", var!(foreground));
        }
    }

    pub c_euv_sidebar_link_active {
        display: "block";
        padding: format!("{} {}", var!(space-md), var!(space-md));
        font-size: var!(font-base);
        background: var!(accent);
        color: var!(text-on-accent);
        font-weight: "600";
        cursor: "pointer";
        // Active link: when the cursor is over it, the accent background
        // must dominate. Drop the inset bar entirely so the accent fill
        // carries the visual weight; on dark accent, an inset bar in the
        // foreground color is invisible and only competes for the eye's
        // focus. The accent fill + bold text already announce "you are
        // here".
        :hover {
            box-shadow: "none";
        }
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // euv_toc
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_euv_toc {
        // The outer `c_euv_doc_toc` column is already sticky in
        // `c_app_main`'s scroll context — adding another sticky offset here
        // would double the offset and the TOC would slide past the top of
        // the scrollable area instead of staying pinned. Keep the inner
        // toc purely as a layout container.
        display: "flex";
        flex-direction: "column";
        gap: var!(space-xs);
        border-left: format!("1px solid {}", var!(border));
        padding-left: var!(space-lg);
    }

    pub c_euv_toc_title {
        font-size: var!(font-xs);
        font-weight: "700";
        text-transform: "uppercase";
        letter-spacing: "0.08em";
        color: var!(muted-foreground);
        margin-bottom: var!(space-xs);
    }

    pub c_euv_toc_link {
        font-size: var!(font-sm);
        color: var!(muted-foreground);
        cursor: "pointer";
        line-height: "1.5";
        :hover {
            color: var!(accent);
        }
    }

    pub c_euv_toc_link_nested {
        c_euv_toc_link();
        padding-left: var!(space-lg);
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // euv_pagination
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_euv_pagination {
        // CSS grid with two equal columns gives us perfect 50/50 widths
        // regardless of the link content length, which flex with `1 1
        // auto` cannot (each link starts at its own content size). The
        // mobile breakpoint stacks the grid to a single column so each
        // link sizes to its content.
        display: "grid";
        grid-template-columns: "1fr 1fr";
        gap: var!(gap-component);
        // ~`space-2xl` (1.5rem) above the pagination — comfortable
        // breathing room without a huge gap before prev/next. The original
        // `space-4xl` (2.5rem) margin was doubled by a `padding-top` in the
        // docs app override, leaving ~100px of empty space above the
        // pagination boxes which made the page feel bottom-heavy.
        margin-top: var!(space-2xl);
        // `min-width: 0` lets prev/next text actually use ellipsis when the
        // container is narrow — without it the grid track blows out the row.
        min-width: "0px";
        @media ((max-width: 767px)) {
            grid-template-columns: "minmax(0, 1fr)";
        }
    }

    pub c_euv_pagination_link {
        // `min-width: 0` lets long labels ellipsize on the desktop row
        // layout. `overflow: hidden` is required to actually apply ellipsis
        // when content is wider than the link.
        min-width: "0px";
        border: format!("1px solid {}", var!(border));
        padding: var!(space-lg);
        cursor: "pointer";
        display: "flex";
        flex-direction: "column";
        gap: var!(space-2xs);
        overflow: "hidden";
        :hover {
            border-color: var!(accent);
        }
    }

    pub c_euv_pagination_label {
        font-size: var!(font-xs);
        color: var!(muted-foreground);
        text-transform: "uppercase";
        letter-spacing: "0.08em";
    }

    pub c_euv_pagination_text {
        font-size: var!(font-base);
        font-weight: "600";
        color: var!(accent);
        // Ellipsize when the link is too narrow for the page title. The
        // outer `.c_euv_pagination_link` already sets `overflow: hidden`
        // and `min-width: 0`, so a single `text-overflow: ellipsis` here
        // is enough — without `white-space: nowrap` the text wraps to
        // multiple lines and the ellipsis never kicks in.
        white-space: "nowrap";
        overflow: "hidden";
        text-overflow: "ellipsis";
        min-width: "0px";
    }

    pub c_euv_pagination_next {
        text-align: "right";
    }

    pub c_euv_pagination_spacer {
        flex: "1";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // euv_drawer
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_euv_drawer_overlay {
        position: "fixed";
        top: "0px";
        left: "0px";
        right: "0px";
        bottom: "0px";
        background: var!(bg-overlay);
        z-index: "200";
        transition: format!("opacity {} {}, visibility {} {}", var!(duration-overlay), var!(ease-out), var!(duration-overlay), var!(ease-out));
    }

    pub c_euv_drawer_overlay_open {
        opacity: "1";
        visibility: "visible";
    }

    pub c_euv_drawer_overlay_closed {
        opacity: "0";
        visibility: "hidden";
    }

    pub c_euv_drawer {
        position: "fixed";
        top: "0px";
        left: "0px";
        bottom: "0px";
        width: "260px";
        background: var!(background);
        border-right: format!("1px solid {}", var!(border));
        z-index: "201";
        overflow-y: "auto";
        padding: var!(space-xl);
        transition: format!("transform {} {}, visibility {} {}", var!(duration-normal), var!(ease-out), var!(duration-normal), var!(ease-out));
    }

    pub c_euv_drawer_open {
        transform: "translateX(0px)";
        visibility: "visible";
    }

    pub c_euv_drawer_closed {
        transform: "translateX(-100%)";
        visibility: "hidden";
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // euv_markdown / euv_footer
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_euv_markdown {
        width: "100%";
        min-width: "0px";
    }

    pub c_euv_footer {
        // Footer sits at the natural end of the article column. The user
        // reaches it by scrolling to the bottom of the article — no sticky
        // or fixed positioning. This matches the desktop behavior and
        // Avoid any layout interference on mobile (where a sticky footer
        // would overlap the last lines of content while scrolling).
        // `space-2xl` (1.5rem) above the footer matches the gap between
        // article and pagination, keeping a consistent rhythm in the
        // tail block. The previous `space-7xl` (5rem) was far beyond the
        // typography scale and made the footer feel detached from the
        // pagination.
        margin-top: var!(space-2xl);
        // `space-lg` top/bottom (1rem) — enough padding for the dashed
        // border to breathe without pushing the text far from the rule.
        padding: format!("{} 0px", var!(space-lg));
        border-top: format!("1px dashed {}", var!(border));
        text-align: "center";
        font-size: var!(font-sm);
        color: var!(muted-foreground);
    }

    // ═══════════════════════════════════════════════════════════════════════════
    // euv_result / euv_doc_layout
    // ═══════════════════════════════════════════════════════════════════════════

    pub c_euv_result {
        display: "flex";
        flex-direction: "column";
        align-items: "center";
        justify-content: "center";
        text-align: "center";
        gap: var!(space-md);
        padding: format!("{} {}", var!(space-4xl), var!(space-md));
        min-height: "50vh";
    }

    pub c_euv_result_code {
        font-size: var!(font-6xl);
        font-weight: "700";
        line-height: "1";
        letter-spacing: "-0.02em";
    }

    pub c_euv_result_title {
        font-size: var!(font-2xl);
        font-weight: "600";
        margin: "0px";
    }

    pub c_euv_result_description {
        color: var!(muted-foreground);
        margin: "0px";
    }

    pub c_euv_result_actions {
        display: "flex";
        gap: var!(space-md);
        margin-top: var!(space-lg);
    }

    pub c_euv_doc_layout {
        display: "flex";
        gap: var!(space-4xl);
        width: "100%";
        min-width: "0px";
        max-width: "1080px";
        margin: "0px auto";
    }

    pub c_euv_doc_content {
        // Two parallel children — the article body and the
        // `c_euv_doc_tail` wrapper (pagination + footer). The flex column
        // distributes them at the two ends:
        //   - when the article is shorter than the column's intrinsic
        //     height, `justify-content: space-between` pushes the tail to
        //     the bottom edge;
        //   - when the article is longer, the tail sits right after the
        //     article in normal flow (because content height exceeds
        //     min-height, there's no remaining space to distribute).
        // `min-height: 100vh` stretches the column to at least one full
        // viewport tall — without this, a short article would leave the
        // tail directly under the body instead of at the bottom of the
        // viewport.
        flex: "1";
        min-width: "0px";
        max-width: var!(content-max-width);
        display: "flex";
        flex-direction: "column";
        justify-content: "space-between";
        min-height: "100vh";
    }

    pub c_euv_doc_tail {
        // Plain block wrapper that groups pagination + footer into one
        // flex child. With `display: contents` the wrapper would be
        // skipped and the two siblings would behave as direct children
        // of `c_euv_doc_content` — breaking the two-parallel-containers
        // contract that `justify-content: space-between` relies on.
        display: "block";
    }

    pub c_euv_doc_toc {
        width: "200px";
        flex-shrink: "0";
        // Pin the TOC column to the viewport while the main content scrolls.
        // The sticky scroll container is `c_app_main` (the overflow:auto
        // wrapper), so `top: 0` keeps the TOC aligned with the top of the
        // scrollable area for the whole article. The column is left at its
        // natural flex stretch height (= the article's content height) so
        // the sticky range covers the whole main column — without the stretch
        // the column would shrink to its content height and the sticky would
        // disengage as soon as the TOC's bottom exits the viewport.
        position: "sticky";
        top: "0px";
        padding-top: var!(padding-main-top);
        @media ((max-width: 1100px)) {
            display: "none";
        }
    }
}