/* ============================================================
   MarkdownBin — "Developer Editorial" Design System
   ============================================================ */

/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    /* Color System — Warm Stone + Burnt Orange */
    --color-bg: #faf9f7;
    --color-bg-elevated: #ffffff;
    --color-text: #1c1917;
    --color-text-muted: #78716c;
    --color-text-faint: #a8a29e;
    --color-border: #e7e5e4;
    --color-border-subtle: #f5f5f4;
    --color-link: #c2410c;
    --color-link-hover: #9a3412;
    --color-code-bg: #f5f5f4;
    --color-header-bg: rgba(250, 249, 247, 0.85);
    --color-accent: #c2410c;
    --color-accent-hover: #9a3412;
    --color-accent-soft: rgba(194, 65, 12, 0.08);
    --color-success: #15803d;
    --color-success-soft: rgba(21, 128, 61, 0.1);
    --color-danger: #dc2626;
    --color-danger-soft: rgba(220, 38, 38, 0.1);
    --color-warning: #d97706;
    --color-warning-soft: rgba(217, 119, 6, 0.1);
    --color-info: #2563eb;
    --color-info-soft: rgba(37, 99, 235, 0.1);

    /* Layout */
    --content-max-width: 48rem;
    --sidebar-width: 16rem;
    --page-max-width: 90rem;
    --header-height: 3.5rem;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Typography */
    --font-display: 'Fraunces', 'Georgia', serif;
    --font-sans: 'Outfit', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, monospace;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(28, 25, 23, 0.04);
    --shadow-md: 0 2px 8px rgba(28, 25, 23, 0.06), 0 1px 2px rgba(28, 25, 23, 0.04);
    --shadow-lg: 0 8px 24px rgba(28, 25, 23, 0.08), 0 2px 8px rgba(28, 25, 23, 0.04);
    --shadow-glow: 0 0 0 3px var(--color-accent-soft);

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --duration-fast: 0.15s;
    --duration-normal: 0.25s;
    --duration-slow: 0.4s;
}

/* === Dark Mode === */
[data-theme="dark"] {
    --color-bg: #0c0a09;
    --color-bg-elevated: #1c1917;
    --color-text: #e7e5e4;
    --color-text-muted: #a8a29e;
    --color-text-faint: #78716c;
    --color-border: #292524;
    --color-border-subtle: #1c1917;
    --color-link: #fb923c;
    --color-link-hover: #fdba74;
    --color-code-bg: #1c1917;
    --color-header-bg: rgba(12, 10, 9, 0.85);
    --color-accent: #fb923c;
    --color-accent-hover: #fdba74;
    --color-accent-soft: rgba(251, 146, 60, 0.12);
    --color-success: #4ade80;
    --color-success-soft: rgba(74, 222, 128, 0.1);
    --color-danger: #f87171;
    --color-danger-soft: rgba(248, 113, 113, 0.1);
    --color-warning: #fbbf24;
    --color-warning-soft: rgba(251, 191, 36, 0.1);
    --color-info: #60a5fa;
    --color-info-soft: rgba(96, 165, 250, 0.1);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4), 0 2px 8px rgba(0, 0, 0, 0.2);
}

@media (prefers-color-scheme: dark) {
    [data-theme="auto"] {
        --color-bg: #0c0a09;
        --color-bg-elevated: #1c1917;
        --color-text: #e7e5e4;
        --color-text-muted: #a8a29e;
        --color-text-faint: #78716c;
        --color-border: #292524;
        --color-border-subtle: #1c1917;
        --color-link: #fb923c;
        --color-link-hover: #fdba74;
        --color-code-bg: #1c1917;
        --color-header-bg: rgba(12, 10, 9, 0.85);
        --color-accent: #fb923c;
        --color-accent-hover: #fdba74;
        --color-accent-soft: rgba(251, 146, 60, 0.12);
        --color-success: #4ade80;
        --color-success-soft: rgba(74, 222, 128, 0.1);
        --color-danger: #f87171;
        --color-danger-soft: rgba(248, 113, 113, 0.1);
        --color-warning: #fbbf24;
        --color-warning-soft: rgba(251, 191, 36, 0.1);
        --color-info: #60a5fa;
        --color-info-soft: rgba(96, 165, 250, 0.1);

        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
        --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
        --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4), 0 2px 8px rgba(0, 0, 0, 0.2);
    }
}

/* === Noise Texture Overlay === */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    opacity: 0.025;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 256px 256px;
    pointer-events: none;
    z-index: 9999;
}

/* === Body === */
body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* === Global Transitions === */
a, button, input, select, textarea, .btn, .badge, .card {
    transition: all var(--duration-fast) ease;
}

a { color: var(--color-link); text-decoration: none; }
a:hover { color: var(--color-link-hover); }

/* === Animations === */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* === Site Header === */
.site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1.5rem;
    height: var(--header-height);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-header-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-logo {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.site-logo:hover { color: var(--color-text); text-decoration: none; }

.site-logo .logo-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.75rem;
    height: 1.75rem;
    background: var(--color-accent);
    color: #fff;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 700;
    line-height: 1;
}

.site-nav {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.site-nav a {
    color: var(--color-text);
    font-size: 0.875rem;
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-md);
    text-decoration: none;
}

.site-nav a:hover {
    color: var(--color-accent);
    background: var(--color-accent-soft);
    text-decoration: none;
}

.btn-link {
    background: none;
    border: none;
    cursor: pointer;
    font: inherit;
    color: var(--color-text);
    font-size: 0.875rem;
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-md);
}

.btn-link:hover {
    color: var(--color-text);
    background: var(--color-accent-soft);
}

.btn-new {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.875rem;
    background: var(--color-accent);
    color: #000;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    font-weight: 600;
    font-family: var(--font-sans);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--duration-fast) ease;
}

.site-nav a.btn-new {
    color: #fff;
    opacity: 1;
}
.site-nav a.btn-new:hover {
    background: var(--color-accent-hover);
    color: #fff;
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Nav dropdowns */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-trigger {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    cursor: pointer;
    color: var(--color-text);
    font-size: 0.875rem;
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    background: none;
    border: none;
    font: inherit;
}

.nav-dropdown-trigger:hover {
    color: var(--color-accent);
    background: var(--color-accent-soft);
}

.nav-dropdown-trigger .caret {
    font-size: 0.6rem;
    opacity: 0.6;
    transition: transform var(--duration-fast) ease;
}

.nav-dropdown:hover .caret,
.nav-dropdown.open .caret {
    transform: rotate(180deg);
}

.nav-dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 0.25rem);
    right: 0;
    min-width: 12rem;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 0.375rem 0;
    z-index: 100;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.open .nav-dropdown-menu {
    display: block;
}

/* Invisible bridge to cover the gap between trigger and menu */
.nav-dropdown-menu::before {
    content: '';
    position: absolute;
    top: -0.5rem;
    left: 0;
    right: 0;
    height: 0.5rem;
}

.nav-dropdown-menu a,
.nav-dropdown-menu button {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.5rem 1rem;
    color: var(--color-text);
    font-size: 0.8125rem;
    text-decoration: none;
    background: none;
    border: none;
    font: inherit;
    cursor: pointer;
    text-align: left;
}

.nav-dropdown-menu a:hover,
.nav-dropdown-menu button:hover {
    background: var(--color-accent-soft);
    color: var(--color-accent);
}

.nav-dropdown-menu .dropdown-divider {
    height: 1px;
    background: var(--color-border);
    margin: 0.375rem 0;
}

.nav-dropdown-menu .dropdown-label {
    padding: 0.375rem 1rem 0.25rem;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-faint);
    font-weight: 600;
}

.nav-dropdown-menu .dropdown-item-accent {
    color: var(--color-accent);
}

.nav-dropdown-menu .dropdown-item-danger {
    color: var(--color-error, #c46b6b);
}

/* Btn-new as dropdown trigger — preserve accent styling */
.nav-dropdown .btn-new.nav-dropdown-trigger {
    background: var(--color-accent);
    color: #fff;
    font-weight: 600;
    font-size: 0.8125rem;
    gap: 0.375rem;
}

.nav-dropdown .btn-new.nav-dropdown-trigger:hover {
    background: var(--color-accent-hover);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.nav-dropdown .btn-new .caret {
    opacity: 0.8;
    color: inherit;
}

/* Theme Toggle */
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    color: var(--color-text-muted);
    font-size: 1rem;
    transition: all var(--duration-fast) ease;
}

.theme-toggle:hover {
    color: var(--color-text);
    border-color: var(--color-text-muted);
    background: var(--color-accent-soft);
}

/* === Main === */
.site-main {
    max-width: var(--page-max-width);
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.site-main > * {
    animation: fadeInUp var(--duration-slow) var(--ease-out) both;
}

/* Stagger children */
.site-main > *:nth-child(1) { animation-delay: 0s; }
.site-main > *:nth-child(2) { animation-delay: 0.06s; }
.site-main > *:nth-child(3) { animation-delay: 0.12s; }
.site-main > *:nth-child(4) { animation-delay: 0.18s; }
.site-main > *:nth-child(5) { animation-delay: 0.24s; }

/* === Footer === */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 1.5rem;
    text-align: center;
    font-size: 0.8125rem;
    color: var(--color-text-faint);
    margin-top: 4rem;
}

.site-footer a {
    color: var(--color-text-muted);
}

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

.footer-inner {
    max-width: var(--page-max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-links {
    display: flex;
    gap: 1.25rem;
}

.footer-copyright {
    font-size: 0.75rem;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    background: var(--color-bg-elevated);
    color: var(--color-text);
    cursor: pointer;
    font: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--duration-fast) ease;
}

.btn:hover {
    border-color: var(--color-text-muted);
    box-shadow: var(--shadow-sm);
}

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

.btn-primary:hover {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-danger {
    background: var(--color-danger);
    color: #fff;
    border-color: var(--color-danger);
}

.btn-ghost {
    background: transparent;
    border-color: transparent;
    color: var(--color-text-muted);
}

.btn-ghost:hover {
    background: var(--color-accent-soft);
    color: var(--color-text);
}

.btn-sm {
    padding: 0.25rem 0.625rem;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    border-radius: var(--radius-lg);
}

/* === Cards === */
.card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
    transition: all var(--duration-normal) var(--ease-out);
}

.card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-text-faint);
}

.card-clickable:hover {
    transform: translateY(-2px);
}

/* === Badges === */
.badge {
    display: inline-flex;
    align-items: center;
    font-size: 0.6875rem;
    font-weight: 600;
    padding: 0.125rem 0.5rem;
    border-radius: 9999px;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.badge-public { background: var(--color-success-soft); color: var(--color-success); }
.badge-unlisted { background: var(--color-warning-soft); color: var(--color-warning); }
.badge-private { background: var(--color-danger-soft); color: var(--color-danger); }

/* === Home Page === */
.hero {
    text-align: center;
    padding: 4rem 0 3rem;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.hero-title .accent { color: var(--color-accent); }

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    max-width: 32rem;
    margin: 0 auto 2rem;
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Feature Grid */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin: 3rem 0;
}

.feature-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: all var(--duration-normal) var(--ease-out);
}

.feature-card:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: var(--radius-md);
    background: var(--color-accent-soft);
    color: var(--color-accent);
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    font-family: var(--font-mono);
    font-weight: 700;
}

.feature-card h3 {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* Recent Documents Section */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 1rem;
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
}

.recent-documents h2 { font-family: var(--font-display); font-size: 1.25rem; font-weight: 700; margin-bottom: 1rem; }

.document-list { list-style: none; }

.document-list li {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 0.625rem 0.75rem;
    border-radius: var(--radius-md);
    transition: background var(--duration-fast) ease;
}

.document-list li:hover {
    background: var(--color-accent-soft);
}

.document-list li + li {
    border-top: 1px solid var(--color-border-subtle);
}

.document-list time, .document-list .meta {
    color: var(--color-text-muted);
    font-size: 0.8125rem;
}

/* === Document Layout === */
.document-layout { display: flex; gap: 2rem; }
.document-content { flex: 1; min-width: 0; }
.document-header { margin-bottom: 2rem; }

.document-header h1 {
    font-family: var(--font-display);
    font-size: 2.25rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.01em;
}

.document-meta {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-top: 0.75rem;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.document-meta .separator {
    color: var(--color-border);
}

/* === Rendered Markdown === */
.rendered-markdown h1, .rendered-markdown h2, .rendered-markdown h3,
.rendered-markdown h4, .rendered-markdown h5, .rendered-markdown h6 {
    font-family: var(--font-display);
    margin-top: 2em;
    margin-bottom: 0.5em;
    line-height: 1.3;
    font-weight: 700;
}

.rendered-markdown h1 { font-size: 1.875rem; }
.rendered-markdown h2 {
    font-size: 1.5rem;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.375rem;
}
.rendered-markdown h3 { font-size: 1.25rem; }
.rendered-markdown h4 { font-size: 1.125rem; }
.rendered-markdown p { margin-bottom: 1rem; }
.rendered-markdown ul, .rendered-markdown ol { margin-bottom: 1rem; padding-left: 1.5rem; }
.rendered-markdown li + li { margin-top: 0.25rem; }

.rendered-markdown pre {
    background: var(--color-code-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1rem 1.25rem;
    overflow-x: auto;
    margin-bottom: 1rem;
    font-size: 0.8125rem;
    line-height: 1.7;
    position: relative;
}

.rendered-markdown code {
    font-family: var(--font-mono);
    font-size: 0.85em;
}

.rendered-markdown :not(pre) > code {
    background: var(--color-code-bg);
    padding: 0.125rem 0.4rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border-subtle);
    font-size: 0.8em;
}

.rendered-markdown table {
    border-collapse: collapse;
    width: 100%;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.rendered-markdown th, .rendered-markdown td {
    border: 1px solid var(--color-border);
    padding: 0.5rem 0.75rem;
    text-align: left;
}

.rendered-markdown th {
    background: var(--color-code-bg);
    font-weight: 600;
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--color-text-muted);
}

.rendered-markdown blockquote {
    border-left: 3px solid var(--color-accent);
    padding: 0.75rem 1rem;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    background: var(--color-accent-soft);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.rendered-markdown img { max-width: 100%; height: auto; border-radius: var(--radius-md); }
.rendered-markdown hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 2.5rem 0;
}

/* === Heading Permalinks === */
.heading-permalink {
    color: var(--color-text-faint);
    opacity: 0;
    margin-right: 0.25rem;
    text-decoration: none;
    transition: opacity var(--duration-fast) ease;
}

*:hover > .heading-permalink { opacity: 0.6; }
.heading-permalink:hover { opacity: 1 !important; color: var(--color-accent); }

/* === TOC === */
.toc {
    position: sticky;
    top: calc(var(--header-height) + 2rem);
    width: var(--sidebar-width);
    flex-shrink: 0;
    font-size: 0.8125rem;
    max-height: calc(100vh - var(--header-height) - 4rem);
    overflow-y: auto;
}

.toc-title {
    font-size: 0.6875rem;
    text-transform: uppercase;
    color: var(--color-text-faint);
    margin-bottom: 0.75rem;
    letter-spacing: 0.08em;
    font-weight: 600;
}

.toc-list { list-style: none; }

.toc-item {
    padding: 0.2rem 0;
}

.toc-item a {
    color: var(--color-text-muted);
    text-decoration: none;
    display: block;
    padding: 0.125rem 0.5rem;
    border-radius: var(--radius-sm);
    border-left: 2px solid transparent;
    transition: all var(--duration-fast) ease;
}

.toc-item a:hover {
    color: var(--color-accent);
    background: var(--color-accent-soft);
    text-decoration: none;
}

.toc-item a.active {
    color: var(--color-accent);
    border-left-color: var(--color-accent);
    font-weight: 500;
}

.toc-level-2 { padding-left: 0.75rem; }
.toc-level-3 { padding-left: 1.5rem; }
.toc-level-4 { padding-left: 2.25rem; }

/* === Version Switcher === */
.version-switcher {
    margin-top: 0.5rem;
    font-size: 0.8125rem;
}

.version-switcher label { color: var(--color-text-muted); margin-right: 0.25rem; }

.version-switcher select {
    font: inherit;
    font-size: 0.8125rem;
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-elevated);
    color: var(--color-text);
    cursor: pointer;
    transition: border-color var(--duration-fast) ease;
}

.version-switcher select:hover {
    border-color: var(--color-text-muted);
}

.version-switcher select:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: var(--shadow-glow);
}

/* === Admonitions === */
.admonition {
    border-left: 4px solid var(--color-accent);
    padding: 1rem 1.25rem;
    margin-bottom: 1rem;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    background: var(--color-code-bg);
}

.admonition-title { font-weight: 600; margin-bottom: 0.5rem; font-size: 0.875rem; }
.admonition-note { border-color: var(--color-info); background: var(--color-info-soft); }
.admonition-warning { border-color: var(--color-warning); background: var(--color-warning-soft); }
.admonition-danger { border-color: var(--color-danger); background: var(--color-danger-soft); }
.admonition-tip { border-color: var(--color-success); background: var(--color-success-soft); }
.admonition-info { border-color: var(--color-info); background: var(--color-info-soft); }

/* === Editor === */
.editor-layout {
    display: flex;
    height: calc(100vh - var(--header-height));
}

.editor-pane, .preview-pane {
    flex: 1;
    overflow-y: auto;
}

.editor-pane {
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    background: var(--color-bg);
}

.editor-pane textarea {
    flex: 1;
    resize: none;
    border: none;
    padding: 1.25rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.7;
    background: var(--color-bg);
    color: var(--color-text);
    outline: none;
    tab-size: 4;
}

.editor-pane textarea::placeholder {
    color: var(--color-text-faint);
}

.preview-pane {
    padding: 1.5rem 2rem;
    background: var(--color-bg-elevated);
}

.editor-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.75rem;
    gap: 0.5rem;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-code-bg);
}

.editor-toolbar input[type="text"] {
    border: 1px solid var(--color-border);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    background: var(--color-bg-elevated);
    color: var(--color-text);
    flex: 1;
    transition: border-color var(--duration-fast) ease, box-shadow var(--duration-fast) ease;
}

.editor-toolbar input[type="text"]:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: var(--shadow-glow);
}

.editor-toolbar input[type="text"]::placeholder {
    color: var(--color-text-faint);
}

.editor-format-bar {
    display: flex;
    gap: 0.125rem;
    padding: 0.25rem 0.75rem;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-code-bg);
}

.format-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.75rem;
    height: 1.75rem;
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--color-text-muted);
    font-size: 0.8125rem;
    font-family: var(--font-mono);
    font-weight: 600;
    transition: all var(--duration-fast) ease;
}

.format-btn:hover {
    background: var(--color-accent-soft);
    color: var(--color-accent);
}

.format-separator {
    width: 1px;
    margin: 0.25rem 0.375rem;
    background: var(--color-border);
}

.editor-status {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.25rem 0.75rem;
    border-top: 1px solid var(--color-border);
    background: var(--color-code-bg);
    font-size: 0.75rem;
    color: var(--color-text-faint);
}

/* === Collection Layout === */
.collection-layout { display: flex; gap: 2rem; }

.collection-sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
}

.collection-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.collection-desc {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
}

.collection-nav { list-style: none; }

.collection-nav li {
    padding: 0;
}

.collection-nav li a {
    display: block;
    padding: 0.375rem 0.75rem;
    border-left: 2px solid transparent;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.875rem;
    transition: all var(--duration-fast) ease;
}

.collection-nav li a:hover {
    color: var(--color-text);
    background: var(--color-accent-soft);
    text-decoration: none;
}

.collection-nav li.active a {
    color: var(--color-accent);
    border-left-color: var(--color-accent);
    font-weight: 600;
    background: var(--color-accent-soft);
}

.collection-content {
    flex: 1;
    min-width: 0;
    display: flex;
    gap: 2rem;
}

.breadcrumbs {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
}

.breadcrumbs a { color: var(--color-text-muted); }
.breadcrumbs a:hover { color: var(--color-accent); }

.breadcrumb-sep {
    color: var(--color-text-faint);
    font-size: 0.75rem;
}

/* === Auth Forms === */
.auth-page {
    display: flex;
    min-height: calc(100vh - var(--header-height));
    animation: none;
}

.auth-brand {
    flex: 0 0 40%;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 3rem;
    color: #fff;
}

.auth-brand h2 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
}

.auth-brand p {
    font-size: 1rem;
    opacity: 0.85;
    max-width: 18rem;
    text-align: center;
    line-height: 1.6;
}

.auth-form-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem;
}

.auth-form {
    width: 100%;
    max-width: 24rem;
}

.auth-form h1 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.375rem;
}

.auth-form .auth-subtitle {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-bottom: 1.75rem;
}

.auth-form label {
    display: block;
    margin-bottom: 0.375rem;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text);
}

.auth-form input[type="email"],
.auth-form input[type="password"],
.auth-form input[type="text"] {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    font: inherit;
    font-size: 0.875rem;
    background: var(--color-bg-elevated);
    color: var(--color-text);
    transition: border-color var(--duration-fast) ease, box-shadow var(--duration-fast) ease;
}

.auth-form input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: var(--shadow-glow);
}

.auth-form .error {
    color: var(--color-danger);
    font-size: 0.8125rem;
    margin-top: -0.75rem;
    margin-bottom: 0.75rem;
}

.auth-form .btn-primary {
    width: 100%;
    padding: 0.625rem;
    font-size: 0.9375rem;
}

.auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.auth-footer a {
    color: var(--color-accent);
    font-weight: 500;
}

/* === Dashboard === */
.dashboard h1 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
}

.dashboard section { margin-bottom: 2.5rem; }

.dashboard h2 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.stat-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.stat-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
    transition: all var(--duration-normal) var(--ease-out);
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.stat-card .stat-icon {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.stat-card .stat-value {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
    margin-bottom: 0.25rem;
}

.stat-card .stat-label {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.collection-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
    gap: 1rem;
}

.collection-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    text-decoration: none;
    color: var(--color-text);
    box-shadow: var(--shadow-sm);
    transition: all var(--duration-normal) var(--ease-out);
    display: block;
}

.collection-card:hover {
    text-decoration: none;
    color: var(--color-text);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--color-accent);
}

.collection-card h3 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.collection-card .doc-count {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* Empty States */
.empty-state {
    text-align: center;
    padding: 2.5rem 1rem;
    color: var(--color-text-muted);
}

.empty-state .empty-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    opacity: 0.4;
}

.empty-state p {
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

/* === Create / Upload Pages === */
.create-page h1, .upload-page h1 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 0.375rem;
}

.create-form, .upload-form {
    max-width: 32rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.375rem;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font: inherit;
    font-size: 0.875rem;
    background: var(--color-bg-elevated);
    color: var(--color-text);
    transition: border-color var(--duration-fast) ease, box-shadow var(--duration-fast) ease;
}

.form-group input[type="text"]:focus,
.form-group input[type="email"]:focus,
.form-group input[type="password"]:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: var(--shadow-glow);
}

.form-group textarea {
    resize: vertical;
    min-height: 4rem;
}

.form-group select {
    cursor: pointer;
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.form-error {
    color: var(--color-danger);
    font-size: 0.8125rem;
    margin-top: 0.75rem;
}

.form-success {
    color: var(--color-success);
    font-size: 0.8125rem;
    margin-top: 0.75rem;
}

/* Visibility Toggle */
.visibility-toggle {
    display: flex;
    gap: 0.5rem;
}

.vis-option {
    cursor: pointer;
}

.vis-option input[type="radio"] {
    display: none;
}

.vis-label {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: all var(--duration-fast) ease;
}

.vis-option input[type="radio"]:checked + .vis-label {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

.vis-label:hover {
    border-color: var(--color-accent);
    color: var(--color-text);
}

/* Upload Mode Tabs */
.upload-mode-tabs {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0;
}

.tab-btn {
    padding: 0.5rem 1rem;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    font: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: all var(--duration-fast) ease;
    margin-bottom: -1px;
}

.tab-btn:hover {
    color: var(--color-text);
}

.tab-btn.active {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

/* Drop Zone */
.drop-zone {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    transition: all var(--duration-fast) ease;
    cursor: pointer;
    max-width: 32rem;
}

.drop-zone:hover, .drop-zone.drag-over {
    border-color: var(--color-accent);
    background: var(--color-accent-soft);
}

.drop-zone-content p {
    margin: 0.25rem 0;
}

.drop-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    opacity: 0.5;
}

.file-preview {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--color-code-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: 1.25rem;
}

.file-name {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    flex: 1;
}

.editor-status-indicator {
    font-size: 0.75rem;
    color: var(--color-text-faint);
}

/* Utility */
.text-muted { color: var(--color-text-muted); }
.text-accent { color: var(--color-accent); }

/* === Copy Button for Code Blocks === */
.copy-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    padding: 0.25rem 0.625rem;
    font-size: 0.6875rem;
    font-weight: 500;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-elevated);
    color: var(--color-text-muted);
    cursor: pointer;
    opacity: 0;
    transition: all var(--duration-fast) ease;
    font-family: var(--font-sans);
}

pre:hover .copy-btn { opacity: 1; }
.copy-btn:hover { border-color: var(--color-accent); color: var(--color-accent); }

/* === Pagination === */
nav[role="navigation"] {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
}

nav[role="navigation"] p {
    color: var(--color-text-muted);
    font-size: 0.8125rem;
}

nav[role="navigation"] span[aria-current="page"] span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2rem;
    height: 2rem;
    padding: 0 0.5rem;
    background: var(--color-accent);
    color: #fff;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.8125rem;
}

nav[role="navigation"] a[class] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2rem;
    height: 2rem;
    padding: 0 0.5rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    font-size: 0.8125rem;
    text-decoration: none;
    transition: all var(--duration-fast) ease;
}

nav[role="navigation"] a[class]:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    text-decoration: none;
}

nav[role="navigation"] .flex {
    display: flex;
    gap: 0.25rem;
    align-items: center;
}

nav[role="navigation"] .hidden {
    display: none;
}

/* === Responsive === */
@media (max-width: 768px) {
    .document-layout { flex-direction: column; }
    .toc { position: static; width: 100%; order: -1; margin-bottom: 1.5rem; max-height: none; }
    .collection-layout { flex-direction: column; }
    .collection-sidebar { width: 100%; }
    .collection-content { flex-direction: column; }
    .feature-grid { grid-template-columns: 1fr; }
    .stat-cards { grid-template-columns: 1fr; }
    .auth-page { flex-direction: column; }
    .auth-brand { flex: 0 0 auto; padding: 2rem; }
    .auth-brand h2 { font-size: 1.5rem; }
    .hero-title { font-size: 2rem; }
    .footer-inner { flex-direction: column; gap: 0.5rem; }
    .site-main { padding: 1.5rem 1rem; }
}

/* === Error Pages === */
.error-page {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - var(--header-height) - 12rem);
    text-align: center;
    padding: 2rem;
}

.error-code {
    font-family: var(--font-mono);
    font-size: clamp(6rem, 15vw, 10rem);
    font-weight: 800;
    line-height: 1;
    color: var(--color-border);
    letter-spacing: -0.04em;
    position: relative;
    user-select: none;
}

.error-code[data-glitch]::after {
    content: attr(data-glitch);
    position: absolute;
    inset: 0;
    color: var(--color-accent);
    clip-path: inset(45% 0 45% 0);
    animation: error-glitch 3s ease-in-out infinite;
}

@keyframes error-glitch {
    0%, 90%, 100% { clip-path: inset(45% 0 45% 0); transform: none; }
    92% { clip-path: inset(10% 0 60% 0); transform: translateX(-3px); }
    94% { clip-path: inset(60% 0 5% 0); transform: translateX(3px); }
    96% { clip-path: inset(30% 0 40% 0); transform: translateX(-2px); }
    98% { clip-path: inset(50% 0 20% 0); transform: translateX(2px); }
}

.error-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
}

.error-message {
    color: var(--color-text-muted);
    font-size: 1rem;
    max-width: 28rem;
    line-height: 1.6;
    margin-bottom: 2rem;
}

.error-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: center;
}

.error-meta {
    margin-top: 3rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-faint);
    padding: 0.75rem 1.25rem;
    background: var(--color-code-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-align: left;
    max-width: 24rem;
    width: 100%;
    line-height: 1.8;
}

.error-meta span {
    color: var(--color-text-muted);
}

/* === Print === */
@media print {
    .site-header, .site-nav, .toc, .version-switcher, .site-footer { display: none; }
    body::before { display: none; }
    .site-main { max-width: 100%; padding: 0; }
    .document-content { max-width: 100%; }
}