twofold 0.5.1

One document, two views. Markdown share service for humans and agents.
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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Document not found</title>
    <style>
/* twofold — error 404 page ({{ theme }} theme) */
:root {
    --bg: #F5F0EB;
    --fg: #2C2420;
    --fg-secondary: #6B5D52;
    --fg-muted: #A89888;
    --border: #E8E0D8;
    --border-strong: #D4C8B8;
    --accent: #C4762B;
    --accent-hover: #A86220;
    --font-body: Charter, 'Bitstream Charter', 'Sitka Text', Cambria, serif;
    --font-heading: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --max-width: 850px;
}

*, *::before, *::after { box-sizing: border-box; }

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: var(--font-body);
    font-size: 1.0625rem;
    line-height: 1.75;
    border-top: 4px solid var(--accent);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 4rem 1.75rem 2.5rem;
    width: 100%;
}

.error-code {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent);
    margin: 0 0 1rem;
}

h1 {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.15;
    color: var(--accent);
    margin: 0 0 1rem;
    letter-spacing: -0.02em;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--accent);
}

p {
    color: var(--fg-secondary);
    margin: 0;
    max-width: 36rem;
}

footer {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1.75rem 1.75rem 2.5rem;
    text-align: center;
    border-top: 1px solid var(--border-strong);
    width: 100%;
}

footer::before {
    content: "";
    display: block;
    width: 2.5rem;
    height: 3px;
    background: var(--accent);
    margin: 0 auto 1rem;
    border-radius: 2px;
}

footer small {
    color: var(--fg-muted);
    font-size: 0.7rem;
    font-family: var(--font-heading);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

footer small a {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
    transition: color 0.15s ease;
}

footer small a:hover {
    color: var(--accent-hover);
}

@media (max-width: 600px) {
    main { padding: 2.5rem 1rem 1.75rem; }
    h1 { font-size: 1.625rem; }
}
    </style>
</head>
<body>
    <main>
        <p class="error-code">404</p>
        <h1>Document not found</h1>
        <p>This document doesn&#x27;t exist, or the link may be incorrect.</p>
    </main>
    <footer>
        <small>SHARED VIA FLINT &middot; TWOFOLD</small>
    </footer>
</body>
</html>