rsemu 0.0.3

/* The page's design tokens and its handful of shared primitives.
 *
 * Component-specific rules live in the components' own <style scoped> blocks;
 * what is here is what more than one of them needs. Colour is defined once, as
 * custom properties, in a light palette on :root and a dark one under
 * prefers-color-scheme — never a colour whose only definition is inside a
 * media query. */

:root {
  color-scheme: light dark;

  /* Surfaces, from the page backdrop inward. */
  --bg: #f4f2ef;
  --bg-grain: #e9e5df;
  --panel: #fffefc;
  --panel-2: #f7f4f0;
  --line: #ddd6cc;
  --line-strong: #c6bcae;

  /* Ink. */
  --fg: #21201d;
  --fg-dim: #5f5b53;
  --fg-faint: #8b857a;

  /* The accent is a warm amber: instrument panel, not corporate blue. */
  --accent: #a8541b;
  --accent-fg: #ffffff;
  --accent-soft: #f5e6d6;
  --danger: #a3231b;
  --good: #1f6b3f;

  /* The screen bezel is the same in both themes — a CRT is dark either way. */
  --bezel: #16161a;
  --bezel-line: #2c2c33;
  --phosphor: #8ff0a4;
  --phosphor-dim: #3d7a4e;

  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.05), 0 8px 24px -12px rgb(0 0 0 / 0.18);

  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, "JetBrains Mono", Menlo,
    Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131316;
    --bg-grain: #191920;
    --panel: #1c1c21;
    --panel-2: #232329;
    --line: #2e2e36;
    --line-strong: #43434e;

    --fg: #ecebe8;
    --fg-dim: #a6a49e;
    --fg-faint: #75736d;

    --accent: #f0a45c;
    --accent-fg: #1b1206;
    --accent-soft: #33240f;
    --danger: #ef7a72;
    --good: #6fd39a;

    --shadow: 0 1px 2px rgb(0 0 0 / 0.4), 0 12px 32px -16px rgb(0 0 0 / 0.7);
  }
}

* {
  box-sizing: border-box;
}

html {
  /* The keyboard drives a d-pad; a page that scrolls under it is a page that
     fights the game. Arrow keys are preventDefault()ed while a machine runs,
     but smooth-scroll on top of that is still worse than no scroll. */
  scroll-behavior: auto;
}

body {
  margin: 0;
  min-height: 100vh;
  font: 15px/1.55 var(--sans);
  color: var(--fg);
  background:
    radial-gradient(1200px 600px at 50% -10%, var(--bg-grain), transparent 70%),
    var(--bg);
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.015em;
}

a {
  color: var(--accent);
}

code,
kbd,
samp,
.mono {
  font-family: var(--mono);
  font-size: 0.92em;
  font-variant-numeric: tabular-nums;
}

/* -- focus ----------------------------------------------------------------- */

/* One visible focus style for everything, and never `outline: none`. The page
   is playable from the keyboard, so the keyboard has to be able to see. */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* -- primitives ------------------------------------------------------------ */

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.panel-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--fg-dim);
}

.panel-body {
  padding: 0.9rem;
  display: grid;
  gap: 0.7rem;
}

.field {
  display: grid;
  gap: 0.3rem;
}

.field > label,
.label {
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--fg-faint);
}

.hint {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--fg-dim);
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
}

/* The volume slider takes whatever the button leaves, so the row stays one
   line at every rail width. */
.row.sound .volume {
  flex: 1 1 6rem;
  min-width: 4rem;
  accent-color: var(--accent, currentColor);
}

.volume-read {
  font-size: 0.78rem;
  color: var(--fg-dim);
  min-width: 2.8rem;
  text-align: right;
}

/* -- controls -------------------------------------------------------------- */

button,
select,
input[type="file"]::file-selector-button {
  font: inherit;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.42rem 0.8rem;
  min-height: 2.1rem;
  font-size: 0.88rem;
  font-weight: 550;
  color: var(--fg);
  background: var(--panel-2);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition:
    background 120ms ease,
    border-color 120ms ease,
    transform 60ms ease;
}

.btn:hover:not(:disabled) {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.42;
  cursor: not-allowed;
}

.btn-primary {
  color: var(--accent-fg);
  background: var(--accent);
  border-color: var(--accent);
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent);
  filter: brightness(1.08);
}

select {
  width: 100%;
  padding: 0.42rem 0.6rem;
  min-height: 2.1rem;
  color: var(--fg);
  background: var(--panel-2);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* A file input styled as a button, with the native control still doing the
   work — a div with a click handler would lose the label, the keyboard and
   the drop target all at once. */
.file {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.42rem 0.8rem;
  min-height: 2.1rem;
  font-size: 0.88rem;
  font-weight: 550;
  background: var(--panel-2);
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease;
}

.file:hover,
.file:focus-within {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.file input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.file:has(input:disabled) {
  opacity: 0.42;
  cursor: not-allowed;
}

kbd {
  display: inline-block;
  min-width: 1.6em;
  padding: 0.1em 0.4em;
  font: 600 0.76rem/1.5 var(--mono);
  text-align: center;
  color: var(--fg-dim);
  background: var(--panel-2);
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: 4px;
}

/* -- utility --------------------------------------------------------------- */

.dim {
  color: var(--fg-dim);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}