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>Protected Document</title>
    <link rel="alternate" type="text/markdown" href="/api/v1/documents/{{ slug }}" title="Full document (markdown)">
    <style>
:root {
    --bg: #faf8f5;
    --fg: #2c2825;
    --fg-secondary: #5c554e;
    --fg-muted: #8a827a;
    --border: #e2ddd7;
    --accent: #8b5e3c;
    --accent-hover: #6d4a2f;
    --error: #c0392b;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #1c1917;
        --fg: #ede9e4;
        --fg-secondary: #b8b0a8;
        --fg-muted: #87807a;
        --border: #3d3632;
        --accent: #d4a574;
        --accent-hover: #e2bb92;
        --error: #e74c3c;
    }
}

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

body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 1rem;
    line-height: 1.6;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.container {
    max-width: 360px;
    width: 100%;
    padding: 2rem;
    text-align: center;
}

h1 {
    font-size: 1.125rem;
    font-weight: 600;
    margin: 0 0 0.5rem;
    color: var(--fg);
}

p {
    color: var(--fg-secondary);
    font-size: 0.875rem;
    margin: 0 0 1.5rem;
}

.error {
    color: var(--error);
    font-size: 0.8125rem;
    margin: 0 0 1rem;
    font-weight: 500;
}

form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

input[type="password"] {
    padding: 0.6rem 0.8rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 1rem;
    background: var(--bg);
    color: var(--fg);
    outline: none;
    transition: border-color 0.15s;
}

input[type="password"]:focus {
    border-color: var(--accent);
}

button {
    padding: 0.6rem 1.2rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s;
}

button:hover {
    background: var(--accent-hover);
}

.footer {
    margin-top: 2rem;
    color: var(--fg-muted);
    font-size: 0.6875rem;
    text-transform: lowercase;
    letter-spacing: 0.05em;
}
    </style>
</head>
<body>
    <!-- AI Agent: This document is password-protected. To access, fetch this same URL with ?access_token=YOUR_PASSWORD as a query parameter. The document owner can provide the password. The legacy parameter ?password= is also accepted. -->
    <div class="container">
        <h1>Protected Document</h1>
        <p>This document requires a password to view.</p>

        <p><strong>For programmatic access:</strong> append
        <code>?access_token=YOUR_PASSWORD</code> to this URL. Example:<br>
        <code>{{ base_url }}/{{ slug }}?access_token=YOUR_PASSWORD</code></p>
        <p>If you are an AI agent and cannot follow constructed URLs, ask your user to paste the URL above with the password filled in.</p>

        {% if let Some(err) = error %}
        <div class="error">{{ err }}</div>
        {% endif %}
        <form method="POST" action="/{{ slug }}/unlock">
            <input type="password" name="password" placeholder="Password" autofocus required>
            <button type="submit">Unlock</button>
        </form>
        <div class="footer">shared via twofold</div>
    </div>
</body>
</html>