/* surfdoc.css v1.0.0 — Unified CSS for the Surf Suite
   CloudSurf Software LLC — https://cloudsurf.com

   A single stylesheet for app chrome AND SurfDoc content rendering.
   Dark-first theme with CSS custom property theming.

   Customization:
   - Override :root variables for accent, surface, background, fonts
   - Use data-theme="light" for explicit light mode
   - System preference auto-detected via prefers-color-scheme
*/

/* ============================================================
   1. THEME VARIABLES
   ============================================================ */

html { overflow-x: hidden; }

:root {
    /* Accent — override for brand color */
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-light: #60a5fa;

    /* Backgrounds — override --background and --surface for site theming */
    --background: #0a0a0f;
    --surface: #111118;
    --surface-hover: #16161f;
    --surface-alt: #161B22;

    /* Borders */
    --border: #1e1e2a;
    --border-light: #2a2a3a;

    /* Text */
    --text: #e5e5ef;
    --text-muted: #8b8ba0;
    --text-faint: #5a5a72;

    /* Code */
    --code-bg: #0d1117;

    /* Semantic colors */
    --danger: #ef4444;
    --danger-light: rgba(239, 68, 68, 0.1);
    --success: #22c55e;
    --success-light: rgba(34, 197, 94, 0.1);
    --warning: #f59e0b;
    --warning-light: rgba(245, 158, 11, 0.1);

    /* Radii */
    --radius: 8px;
    --radius-sm: 4px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);

    /* Typography — --font for app chrome, --font-heading/--font-body for SurfDoc content */
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-heading: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, sans-serif;
    --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, sans-serif;
    --font-mono: "SF Mono", "Fira Code", "JetBrains Mono", Menlo, Monaco, Consolas, monospace;
}

/* ============================================================
   2. LIGHT THEME
   ============================================================ */

/* Explicit light mode toggle */
[data-theme="light"] {
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-light: #3b82f6;
    --background: #ffffff;
    --surface: #f8f9fa;
    --surface-hover: #f0f1f3;
    --surface-alt: #f0f4f8;
    --border: #e2e4e8;
    --border-light: #d0d3d9;
    --text: #1a1a2e;
    --text-muted: #64648a;
    --text-faint: #8888a0;
    --code-bg: #f1f3f5;
    --danger-light: rgba(239, 68, 68, 0.08);
    --success-light: rgba(34, 197, 94, 0.08);
    --warning-light: rgba(245, 158, 11, 0.08);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
}

/* Auto-detect: light mode when no explicit theme set */
@media (prefers-color-scheme: light) {
    :root:not([data-theme]) {
        --accent: #2563eb;
        --accent-hover: #1d4ed8;
        --accent-light: #3b82f6;
        --background: #ffffff;
        --surface: #f8f9fa;
        --surface-hover: #f0f1f3;
        --surface-alt: #f0f4f8;
        --border: #e2e4e8;
        --border-light: #d0d3d9;
        --text: #1a1a2e;
        --text-muted: #64648a;
        --text-faint: #8888a0;
        --code-bg: #f1f3f5;
        --danger-light: rgba(239, 68, 68, 0.08);
        --success-light: rgba(34, 197, 94, 0.08);
        --warning-light: rgba(245, 158, 11, 0.08);
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
        --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    }
}

/* ============================================================
   3. RESET & BASE
   ============================================================ */

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text);
    background: var(--background);
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 150ms ease;
}

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

img {
    max-width: 100%;
    height: auto;
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; }

/* ============================================================
   4. NAVIGATION (app chrome)
   ============================================================ */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.88);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

[data-theme="light"] .nav {
    background: rgba(255, 255, 255, 0.88);
}

@media (prefers-color-scheme: light) {
    :root:not([data-theme]) .nav {
        background: rgba(255, 255, 255, 0.88);
    }
}

.nav-inner {
    max-width: 1120px;
    margin: 0 auto;
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text);
    font-weight: 700;
    font-size: 1.125rem;
    text-decoration: none;
}

.nav-brand:hover { color: var(--text); }

.nav-emblem {
    width: 26px;
    height: 26px;
    border-radius: 6px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    transition: background 150ms ease, color 150ms ease;
    text-decoration: none;
}

.nav-link:hover {
    color: var(--text);
    background: var(--surface);
}

.nav-link.active,
.nav-link-active {
    color: var(--text);
    background: var(--surface);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-cta {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    background: var(--accent);
    color: #fff;
    font-size: 0.8125rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: background 150ms ease;
}

.nav-cta:hover {
    background: var(--accent-hover);
    color: #fff;
}

/* Theme toggle */
.nav-theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    transition: color 150ms ease, background 150ms ease;
}

.nav-theme-toggle:hover {
    color: var(--text);
    background: var(--surface);
}

.nav-theme-toggle .icon-moon { display: none; }
[data-theme="light"] .nav-theme-toggle .icon-sun { display: none; }
[data-theme="light"] .nav-theme-toggle .icon-moon { display: block; }

/* Mobile hamburger */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: 36px;
    height: 36px;
    padding: 8px;
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    cursor: pointer;
    transition: background 150ms ease;
}

.nav-toggle:hover { background: var(--surface); }

.nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
    transition: transform 200ms ease, opacity 200ms ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* Nav badge (notification count) */
.nav-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    border-radius: 9px;
    background: var(--danger);
    color: #fff;
    font-size: 0.6875rem;
    font-weight: 700;
    line-height: 1;
}

/* Research sub-navigation */
.sub-nav {
    position: fixed;
    top: 53px;
    left: 0;
    right: 0;
    z-index: 99;
    background: rgba(10, 10, 15, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

[data-theme="light"] .sub-nav {
    background: rgba(248, 248, 250, 0.92);
}

@media (prefers-color-scheme: light) {
    :root:not([data-theme]) .sub-nav {
        background: rgba(248, 248, 250, 0.92);
    }
}

.sub-nav-inner {
    max-width: 52rem;
    margin: 0 auto;
    padding: 8px 1.5rem;
    display: flex;
    align-items: center;
    gap: 4px;
}

.sub-nav-link {
    color: var(--text-muted);
    font-size: 0.8125rem;
    font-weight: 500;
    padding: 5px 12px;
    border-radius: var(--radius-sm);
    transition: background 150ms ease, color 150ms ease;
    text-decoration: none;
    white-space: nowrap;
}

.sub-nav-link:hover {
    color: var(--text);
    background: var(--surface);
}

.sub-nav-link.active {
    color: var(--text);
    background: var(--surface);
}

/* Offset main content when sub-nav is present */
.sub-nav + main {
    padding-top: 92px;
}

main {
    padding-top: 56px;
}

/* ============================================================
   5. BUTTONS
   ============================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.9375rem;
    line-height: 1;
    cursor: pointer;
    transition: all 150ms ease;
    min-height: 44px;
    border: none;
    text-decoration: none;
    font-family: inherit;
}

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

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

.btn-ghost {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}

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

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

.btn-danger:hover {
    background: #dc2626;
    color: #fff;
}

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

.btn-sm {
    padding: 6px 14px;
    font-size: 0.8125rem;
    min-height: 32px;
    border-radius: var(--radius-sm);
}

.btn-block {
    width: 100%;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============================================================
   6. CARDS & GRIDS
   ============================================================ */

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: border-color 200ms ease, background 200ms ease;
}

.card:hover {
    border-color: var(--border-light);
    background: var(--surface-hover);
}

.card-title {
    font-weight: 700;
    font-size: 1.125rem;
    margin-bottom: 8px;
}

.card-body {
    font-size: 0.9375rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.card-grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

/* ============================================================
   7. SECTIONS
   ============================================================ */

.section {
    border-top: 1px solid var(--border);
}

.section-inner {
    max-width: 1120px;
    margin: 0 auto;
    padding: 80px 24px;
}

.section-header {
    text-align: center;
}

.section-headline {
    font-weight: 700;
    font-size: clamp(1.5rem, 4vw, 2rem);
    line-height: 1.2;
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-muted);
    margin-bottom: 48px;
    max-width: 560px;
}

.section-header .section-subtitle {
    margin-left: auto;
    margin-right: auto;
}

.section-muted {
    background: var(--surface);
}

/* ============================================================
   8. HERO
   ============================================================ */

.hero {
    text-align: center;
}

.hero-inner {
    max-width: 1120px;
    margin: 0 auto;
    padding: 120px 24px 96px;
}

.hero-headline {
    font-weight: 800;
    font-size: clamp(2.25rem, 6vw, 3rem);
    line-height: 1.1;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 36px;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--accent-light);
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 999px;
    padding: 6px 14px;
    margin-bottom: 24px;
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    animation: sui-pulse 2s ease-in-out infinite;
}

@keyframes sui-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

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

/* ============================================================
   9. TABLES (app chrome)
   ============================================================ */

.table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9375rem;
}

.table,
.platform-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9375rem;
}

.table th,
.platform-table th {
    text-align: left;
    padding: 12px 16px;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border);
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.table td,
.platform-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
}

.table tbody tr:hover,
.platform-table tbody tr:hover {
    background: var(--surface);
}

.platform-file {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Comparison table */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.comparison-table th {
    text-align: left;
    padding: 12px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    font-weight: 700;
    font-size: 0.8125rem;
    white-space: nowrap;
}

.comparison-table td {
    padding: 12px 16px;
    border: 1px solid var(--border);
    vertical-align: top;
}

.comparison-table tbody tr:hover { background: var(--surface); }
.comparison-table td:first-child { font-weight: 600; white-space: nowrap; }
.comparison-highlight { background: rgba(59, 130, 246, 0.06); }

/* ============================================================
   10. FORMS (app chrome)
   ============================================================ */

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 10px 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: inherit;
    font-size: 0.9375rem;
    line-height: 1.5;
    transition: border-color 150ms ease;
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-muted);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--accent);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-result {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    margin-top: 16px;
}

.form-result.success {
    background: var(--success-light);
    color: var(--success);
}

.form-result.error {
    background: var(--danger-light);
    color: var(--danger);
}

/* ============================================================
   11. BADGES & STATUS
   ============================================================ */

.badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.badge:empty { display: none; }

.badge-available,
.badge-success {
    background: rgba(34, 197, 94, 0.12);
    border: 1px solid rgba(34, 197, 94, 0.25);
    color: #22c55e;
}

.badge-coming,
.badge-warning {
    background: rgba(234, 179, 8, 0.12);
    border: 1px solid rgba(234, 179, 8, 0.25);
    color: #eab308;
}

.badge-primary {
    background: rgba(59, 130, 246, 0.12);
    border: 1px solid rgba(59, 130, 246, 0.25);
    color: var(--accent);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.25);
    color: #ef4444;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8125rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 999px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.status-supported {
    color: #22c55e;
    background: rgba(34, 197, 94, 0.1);
}

.status-supported .status-dot { background: #22c55e; }

.status-planned {
    color: var(--accent-light);
    background: rgba(59, 130, 246, 0.1);
}

.status-planned .status-dot { background: var(--accent-light); }

/* ============================================================
   12. ALERTS
   ============================================================ */

.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    margin-bottom: 16px;
}

.alert-error {
    background: var(--danger-light);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.alert-success {
    background: var(--success-light);
    color: var(--success);
    border: 1px solid rgba(34, 197, 94, 0.2);
}

.alert-info {
    background: rgba(59, 130, 246, 0.08);
    border: 1px solid rgba(59, 130, 246, 0.2);
    color: var(--text);
}

.alert-info strong { color: var(--accent); }

/* ============================================================
   13. CODE BLOCKS (app chrome)
   ============================================================ */

.code-block {
    position: relative;
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-muted);
}

.code-block pre {
    margin: 0;
    padding: 16px;
    overflow-x: auto;
    font-size: 0.875rem;
    line-height: 1.7;
}

.code-block code {
    font-family: var(--font-mono);
    color: var(--text);
    background: none;
}

.code-copy {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 4px 10px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-size: 0.75rem;
    font-family: inherit;
    cursor: pointer;
    transition: color 150ms ease, border-color 150ms ease;
    z-index: 2;
}

.code-copy:hover {
    color: var(--text);
    border-color: var(--border-light);
}

/* Syntax highlighting — dark */
.code-block .kw { color: #c792ea; }
.code-block .str { color: #c3e88d; }
.code-block .cm { color: #546e7a; }
.code-block .fn { color: #82aaff; }
.code-block .num { color: #f78c6c; }
.code-block .attr { color: #ffcb6b; }
.code-block .tag { color: #f07178; }
.code-block .punct { color: #89ddff; }

/* Syntax highlighting — light */
[data-theme="light"] .code-block .kw { color: #7c3aed; }
[data-theme="light"] .code-block .str { color: #16a34a; }
[data-theme="light"] .code-block .cm { color: #94a3b8; }
[data-theme="light"] .code-block .fn { color: #2563eb; }
[data-theme="light"] .code-block .num { color: #ea580c; }
[data-theme="light"] .code-block .attr { color: #b45309; }
[data-theme="light"] .code-block .tag { color: #dc2626; }
[data-theme="light"] .code-block .punct { color: #0891b2; }

/* Inline code */
:not(pre) > code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    padding: 2px 6px;
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--accent-light);
}

/* ============================================================
   14. STATS
   ============================================================ */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 48px;
}

.stat-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1.2;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.8125rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* ============================================================
   15. STEPS
   ============================================================ */

.steps-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    counter-reset: step;
}

.step-card {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    padding: 24px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.step-number {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent);
    color: #fff;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.875rem;
}

.step-card h3 {
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 4px;
}

.step-card p {
    color: var(--text-muted);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* ============================================================
   16. CAPABILITY GRID
   ============================================================ */

.capability-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.capability-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
}

.capability-card h3 {
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 8px;
}

.capability-card p {
    font-size: 0.9375rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.capability-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.capability-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.capability-location {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ============================================================
   17. FOOTER (app chrome)
   ============================================================ */

.footer {
    border-top: 1px solid var(--border);
    padding: 56px 0 32px;
}

.footer-inner {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
}

.footer-columns {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 40px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1.125rem;
    margin-bottom: 8px;
}

.footer-brand-icon {
    color: var(--accent);
    font-family: var(--font-mono);
}

.footer-tagline {
    font-size: 0.9375rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.footer-heading {
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text);
    margin-bottom: 16px;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 150ms ease;
}

.footer-links a:hover { color: var(--text); }

.footer-text {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 8px;
}

.footer-text a {
    color: var(--accent-light);
    text-decoration: none;
}

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

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid var(--border);
    font-size: 0.8125rem;
    color: var(--text-muted);
}

/* ============================================================
   18. MODAL
   ============================================================ */

dialog.modal {
    max-width: 440px;
    width: calc(100% - 48px);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    padding: 24px;
}

dialog.modal::backdrop {
    background: rgba(0, 0, 0, 0.6);
}

dialog.modal h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.modal-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
    margin-top: 24px;
}

/* ============================================================
   19. EMPTY STATE
   ============================================================ */

.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-muted);
    font-size: 0.9375rem;
}

/* ============================================================
   20. UTILITIES
   ============================================================ */

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

.text-muted { color: var(--text-muted); }
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }

/* ============================================================
   21. FOCUS ACCESSIBILITY
   ============================================================ */

.btn:focus-visible,
.nav-link:focus-visible,
.form-input:focus-visible,
.form-textarea:focus-visible,
.form-select:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}


/* ================================================================
   ================================================================
   SURFDOC CONTENT RENDERING
   ================================================================
   ================================================================ */


/* ============================================================
   22. SURFDOC LAYOUT
   ============================================================ */

.surfdoc { max-width: 48rem; margin: 0 auto; padding: 2rem 1.5rem 4rem; line-height: 1.7; font-family: var(--font-body); }

/* Inline icons */
.surfdoc-icon { display: inline-flex; align-items: center; vertical-align: middle; line-height: 0; }
.surfdoc-icon svg { width: 1em; height: 1em; }

/* Sections — alternating backgrounds */
.surfdoc-section { padding: 2rem 0; }
.surfdoc-section-alt { background: var(--surface-alt, #161B22); width: 100vw; margin-left: calc(-50vw + 50%); padding: 2rem calc(50vw - 50%); }
.surfdoc-section h2 { margin-top: 0; }

/* ============================================================
   23. SURFDOC IN-DOCUMENT NAVIGATION
   ============================================================ */

.surfdoc-nav { display: flex; align-items: center; gap: 1rem; padding: 0.75rem 1.5rem; background: var(--surface); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; width: 100vw; margin-left: calc(-50vw + 50%); margin-top: -2rem; margin-bottom: 1rem; backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); }
.surfdoc-nav-logo { font-weight: 700; color: #fff; font-size: 1rem; margin-right: auto; white-space: nowrap; }
.surfdoc-nav-links { display: flex; align-items: center; gap: 0.25rem; flex-wrap: wrap; }
.surfdoc-nav-links a { color: var(--text-muted); text-decoration: none; font-size: 0.875rem; padding: 0.25rem 0.625rem; border-radius: 6px; transition: color 0.15s, background 0.15s; display: inline-flex; align-items: center; gap: 0.375rem; }
.surfdoc-nav-links a:hover { color: var(--text); background: var(--surface-hover); text-decoration: none; }
.surfdoc-nav-toggle { display: none; }
.surfdoc-nav-hamburger { display: none; cursor: pointer; padding: 0.5rem; margin-left: auto; flex-direction: column; gap: 5px; }
.surfdoc-nav-hamburger span { display: block; width: 22px; height: 2px; background: var(--text); border-radius: 1px; transition: transform 0.2s, opacity 0.2s; }

/* ============================================================
   24. SURFDOC TYPOGRAPHY
   ============================================================ */

.surfdoc h1, .surfdoc h2, .surfdoc h3, .surfdoc h4 { font-family: var(--font-heading); }
.surfdoc h1 { font-size: 1.875rem; font-weight: 700; margin: 2rem 0 1rem; letter-spacing: -0.025em; }
.surfdoc h2 { font-size: 1.5rem; font-weight: 600; margin: 1.75rem 0 0.75rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--border); }
.surfdoc h3 { font-size: 1.25rem; font-weight: 600; margin: 1.5rem 0 0.5rem; }
.surfdoc h4 { font-size: 1.1rem; font-weight: 600; margin: 1.25rem 0 0.5rem; color: var(--text-muted); }
.surfdoc p { margin: 0.75rem 0; }
.surfdoc a { color: var(--accent); text-decoration: none; }
.surfdoc a:hover { text-decoration: underline; }
.surfdoc strong { font-weight: 600; color: #fff; }
.surfdoc em { color: var(--text-muted); }
.surfdoc ul, .surfdoc ol { margin: 0.5rem 0; padding-left: 1.5rem; }
.surfdoc li { margin: 0.25rem 0; }
.surfdoc li::marker { color: var(--text-faint); }
.surfdoc blockquote { border-left: 3px solid var(--accent); padding: 0.5rem 1rem; margin: 1rem 0; background: rgba(59,130,246,0.05); border-radius: 0 6px 6px 0; }
.surfdoc blockquote p { margin: 0.25rem 0; }
.surfdoc code { font-family: var(--font-mono); font-size: 0.85em; background: rgba(255,255,255,0.06); padding: 0.15em 0.4em; border-radius: 4px; }
.surfdoc pre { background: var(--code-bg) !important; border: 1px solid var(--border); border-radius: 8px; padding: 1rem; overflow-x: auto; margin: 1rem 0; }
.surfdoc pre code { background: transparent; padding: 0; font-size: 0.8rem; line-height: 1.6; }
.surfdoc table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.875rem; }
.surfdoc th { text-align: left; padding: 0.5rem 0.75rem; border-bottom: 2px solid var(--border-light); font-weight: 600; color: var(--text-muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.03em; }
.surfdoc td { padding: 0.5rem 0.75rem; border-bottom: 1px solid var(--border); }
.surfdoc tr:hover td { background: rgba(255,255,255,0.02); }
.surfdoc hr { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }
.surfdoc img { max-width: 100%; border-radius: 8px; }

/* ============================================================
   25. SURFDOC CALLOUTS
   ============================================================ */

.surfdoc-callout { border-left: 3px solid; padding: 0.75rem 1rem; margin: 1rem 0; border-radius: 0 8px 8px 0; background: var(--surface); }
.surfdoc-callout strong { display: block; margin-bottom: 0.25rem; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em; }
.surfdoc-callout p { margin: 0; }
.surfdoc-callout-info { border-color: #3b82f6; }
.surfdoc-callout-info strong { color: #3b82f6; }
.surfdoc-callout-warning { border-color: #f59e0b; }
.surfdoc-callout-warning strong { color: #f59e0b; }
.surfdoc-callout-danger { border-color: #ef4444; }
.surfdoc-callout-danger strong { color: #ef4444; }
.surfdoc-callout-tip { border-color: #22c55e; }
.surfdoc-callout-tip strong { color: #22c55e; }
.surfdoc-callout-note { border-color: #06b6d4; }
.surfdoc-callout-note strong { color: #06b6d4; }
.surfdoc-callout-success { border-color: #22c55e; background: rgba(34,197,94,0.05); }
.surfdoc-callout-success strong { color: #22c55e; }

/* ============================================================
   26. SURFDOC DATA TABLES
   ============================================================ */

.surfdoc-data { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.875rem; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.surfdoc-data thead { background: var(--surface); }
.surfdoc-data th { text-align: left; padding: 0.625rem 0.75rem; font-weight: 600; color: var(--text-muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.03em; border-bottom: 2px solid var(--border-light); }
.surfdoc-data td { padding: 0.5rem 0.75rem; border-bottom: 1px solid var(--border); }
.surfdoc-data tr:hover td { background: rgba(255,255,255,0.02); }
.surfdoc-data tr:last-child td { border-bottom: none; }

/* ============================================================
   27. SURFDOC CODE
   ============================================================ */

.surfdoc-code { background: var(--code-bg); border: 1px solid var(--border); border-radius: 8px; padding: 1rem; overflow-x: auto; margin: 1rem 0; font-size: 0.8rem; line-height: 1.6; }
.surfdoc-code code { background: transparent; padding: 0; font-family: var(--font-mono); }

/* ============================================================
   28. SURFDOC TASK LISTS
   ============================================================ */

.surfdoc-tasks { list-style: none; padding-left: 0; margin: 1rem 0; }
.surfdoc-tasks li { display: flex; align-items: center; gap: 0.5rem; padding: 0.375rem 0.75rem; margin: 0.125rem 0; border-radius: 6px; font-size: 0.9rem; }
.surfdoc-tasks li:hover { background: var(--surface-hover); }
.surfdoc-tasks input[type="checkbox"] { accent-color: var(--accent); width: 16px; height: 16px; }
.surfdoc-tasks .assignee { color: var(--accent); font-size: 0.8rem; margin-left: auto; }

/* ============================================================
   29. SURFDOC DECISION RECORDS
   ============================================================ */

.surfdoc-decision { border-left: 3px solid; padding: 0.75rem 1rem; margin: 1rem 0; border-radius: 0 8px 8px 0; background: var(--surface); }
.surfdoc-decision .status { display: inline-block; padding: 0.15rem 0.5rem; border-radius: 4px; font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; margin-right: 0.5rem; }
.surfdoc-decision .date { color: var(--text-faint); font-size: 0.8rem; }
.surfdoc-decision p { margin: 0.5rem 0 0; }
.surfdoc-decision-accepted { border-color: #22c55e; }
.surfdoc-decision-accepted .status { background: rgba(34,197,94,0.15); color: #22c55e; }
.surfdoc-decision-rejected { border-color: #ef4444; }
.surfdoc-decision-rejected .status { background: rgba(239,68,68,0.15); color: #ef4444; }
.surfdoc-decision-proposed { border-color: #f59e0b; }
.surfdoc-decision-proposed .status { background: rgba(245,158,11,0.15); color: #f59e0b; }
.surfdoc-decision-superseded { border-color: var(--text-faint); }
.surfdoc-decision-superseded .status { background: rgba(90,90,114,0.15); color: var(--text-faint); }

/* ============================================================
   30. SURFDOC METRICS
   ============================================================ */

.surfdoc-metric { display: inline-flex; align-items: baseline; gap: 0.5rem; padding: 0.625rem 1rem; margin: 0.5rem 0.5rem 0.5rem 0; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; }
.surfdoc-metric .label { color: var(--text-muted); font-size: 0.8rem; font-weight: 500; }
.surfdoc-metric .value { font-size: 1.25rem; font-weight: 700; color: #fff; }
.surfdoc-metric .unit { color: var(--text-faint); font-size: 0.8rem; }
.surfdoc-metric .trend { font-size: 1rem; }
.surfdoc-metric .trend.up { color: #22c55e; }
.surfdoc-metric .trend.down { color: #ef4444; }
.surfdoc-metric .trend.flat { color: var(--text-faint); }

/* ============================================================
   31. SURFDOC SUMMARIES
   ============================================================ */

.surfdoc-summary { border-left: 3px solid var(--accent); padding: 0.75rem 1rem; margin: 1rem 0; background: rgba(59,130,246,0.04); border-radius: 0 8px 8px 0; font-style: italic; color: var(--text-muted); }
.surfdoc-summary p { margin: 0; }

/* ============================================================
   32. SURFDOC FIGURES
   ============================================================ */

.surfdoc-figure { margin: 1.5rem 0; text-align: center; }
.surfdoc-figure img { max-width: 100%; border-radius: 8px; border: 1px solid var(--border); }
.surfdoc-figure figcaption { margin-top: 0.5rem; font-size: 0.85rem; color: var(--text-faint); font-style: italic; }

/* ============================================================
   33. SURFDOC UNKNOWN BLOCKS
   ============================================================ */

.surfdoc-unknown { padding: 0.75rem 1rem; margin: 1rem 0; background: var(--surface); border: 1px dashed var(--border-light); border-radius: 8px; color: var(--text-muted); font-size: 0.875rem; }

/* ============================================================
   34. SURFDOC TABS
   ============================================================ */

.surfdoc-tabs { margin: 1rem 0; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.surfdoc-tabs nav { display: flex; background: var(--surface); border-bottom: 1px solid var(--border); }
.surfdoc-tabs nav button { padding: 0.5rem 1rem; background: none; border: none; color: var(--text-faint); font-size: 0.85rem; cursor: pointer; border-bottom: 2px solid transparent; transition: all 0.15s; }
.surfdoc-tabs nav button:hover { color: var(--text); background: var(--surface-hover); }
.surfdoc-tabs nav button.active { color: var(--accent); border-bottom-color: var(--accent); }
.surfdoc-tabs .tab-panel { padding: 1rem; display: none; }
.surfdoc-tabs .tab-panel.active { display: block; }

/* ============================================================
   35. SURFDOC COLUMNS
   ============================================================ */

.surfdoc-columns { display: grid; gap: 1.5rem; margin: 1rem 0; }
.surfdoc-columns[data-cols="2"] { grid-template-columns: repeat(2, 1fr); }
.surfdoc-columns[data-cols="3"] { grid-template-columns: repeat(3, 1fr); }
.surfdoc-columns[data-cols="4"] { grid-template-columns: repeat(4, 1fr); }
.surfdoc-column { min-width: 0; }

/* ============================================================
   36. SURFDOC QUOTES
   ============================================================ */

.surfdoc-quote { border-left: 3px solid var(--text-faint); padding: 0.75rem 1.25rem; margin: 1.5rem 0; }
.surfdoc-quote blockquote { border: none; padding: 0; margin: 0; background: none; font-size: 1.1rem; font-style: italic; color: var(--text-muted); line-height: 1.6; }
.surfdoc-quote .attribution { margin-top: 0.5rem; font-size: 0.85rem; color: var(--text-faint); font-style: normal; }
.surfdoc-quote .attribution::before { content: "\2014\00a0"; }

/* ============================================================
   37. SURFDOC CTA BUTTONS
   ============================================================ */

/* Use a.surfdoc-cta to beat .surfdoc a specificity */
a.surfdoc-cta { display: inline-block; padding: 0.625rem 1.5rem; margin: 0.5rem 0.5rem 0.5rem 0; border-radius: 8px; font-weight: 600; font-size: 0.95rem; text-decoration: none; transition: all 0.15s; cursor: pointer; }
a.surfdoc-cta-primary { background: var(--accent); color: var(--accent-text, #fff); border: 1px solid var(--accent); }
a.surfdoc-cta-primary:hover { background: #2563eb; color: #fff; text-decoration: none; }
a.surfdoc-cta-secondary { background: transparent; color: var(--accent); border: 1px solid var(--border-light); }
a.surfdoc-cta-secondary:hover { background: var(--surface-hover); color: var(--accent); text-decoration: none; }

/* ============================================================
   38. SURFDOC HERO IMAGE
   ============================================================ */

.surfdoc-hero-image { margin: 2rem 0; text-align: center; }
.surfdoc-hero-image img { max-width: 100%; border-radius: 12px; box-shadow: 0 8px 32px rgba(0,0,0,0.3); border: 1px solid var(--border); }

/* ============================================================
   39. SURFDOC TESTIMONIALS
   ============================================================ */

.surfdoc-testimonial { padding: 1.25rem 1.5rem; margin: 1rem 0; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; position: relative; }
.surfdoc-testimonial blockquote { border: none; background: none; padding: 0; margin: 0 0 0.75rem; font-size: 1rem; font-style: italic; color: var(--text-muted); line-height: 1.6; }
.surfdoc-testimonial .author { font-weight: 600; color: var(--text); font-size: 0.9rem; }
.surfdoc-testimonial .role { color: var(--text-faint); font-size: 0.8rem; }

/* ============================================================
   40. SURFDOC STYLE & SITE (invisible metadata)
   ============================================================ */

.surfdoc-style { display: none; }
.surfdoc-site { display: none; }

/* ============================================================
   41. SURFDOC FAQ ACCORDION
   ============================================================ */

.surfdoc-faq { margin: 1rem 0; }
.surfdoc-faq details { border: 1px solid var(--border); border-radius: 8px; margin: 0.5rem 0; overflow: hidden; }
.surfdoc-faq summary { padding: 0.75rem 1rem; font-weight: 600; cursor: pointer; background: var(--surface); color: var(--text); font-size: 0.95rem; }
.surfdoc-faq summary:hover { background: var(--surface-hover); }
.surfdoc-faq .faq-answer { padding: 0.75rem 1rem; color: var(--text-muted); line-height: 1.6; border-top: 1px solid var(--border); }

/* ============================================================
   42. SURFDOC PRICING TABLE
   ============================================================ */

.surfdoc-pricing { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.875rem; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.surfdoc-pricing thead { background: var(--surface); }
.surfdoc-pricing th { text-align: center; padding: 0.75rem; font-weight: 600; color: var(--text); border-bottom: 2px solid var(--border-light); font-size: 0.95rem; }
.surfdoc-pricing th:first-child { text-align: left; color: var(--text-faint); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.03em; }
.surfdoc-pricing td { padding: 0.5rem 0.75rem; border-bottom: 1px solid var(--border); text-align: center; }
.surfdoc-pricing td:first-child { text-align: left; font-weight: 500; color: var(--text-muted); }
.surfdoc-pricing tr:hover td { background: rgba(255,255,255,0.02); }
.surfdoc-pricing tr:last-child td { border-bottom: none; }

/* ============================================================
   43. SURFDOC PAGES
   ============================================================ */

.surfdoc-page { margin: 2rem 0; padding: 2rem 0; border-top: 2px solid var(--border); }
.surfdoc-page:first-of-type { border-top: none; margin-top: 0; }
.surfdoc-page[data-layout="hero"] { text-align: center; padding: 4rem 0; }
.surfdoc-page[data-layout="hero"] h1 { font-size: 2.5rem; margin-bottom: 1rem; }
.surfdoc-page[data-layout="hero"] p { font-size: 1.15rem; color: var(--text-muted); max-width: 36rem; margin: 0 auto 1.5rem; }
.surfdoc-page[data-layout="hero"] .surfdoc-cta { margin: 0.5rem; }
.surfdoc-page[data-layout="cards"] { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
.surfdoc-page[data-layout="split"] { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }

/* ============================================================
   44. SURFDOC EMBEDS
   ============================================================ */

.surfdoc-embed { margin: 1.5rem 0; border-radius: 12px; overflow: hidden; border: 1px solid var(--border); }
.surfdoc-embed iframe { display: block; width: 100%; border: none; }
.surfdoc-embed-map { aspect-ratio: 16/9; }
.surfdoc-embed-map iframe { height: 100%; }
.surfdoc-embed-video { aspect-ratio: 16/9; }
.surfdoc-embed-video iframe { height: 100%; }

/* ============================================================
   45. SURFDOC FORMS
   ============================================================ */

.surfdoc-form { margin: 1.5rem 0; padding: 1.5rem; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; }
.surfdoc-form-field { margin-bottom: 1rem; }
.surfdoc-form-field label { display: block; font-size: 0.875rem; font-weight: 500; color: var(--text-muted); margin-bottom: 0.375rem; }
.surfdoc-form-field .required { color: #ef4444; }
.surfdoc-form-field input, .surfdoc-form-field textarea, .surfdoc-form-field select { width: 100%; padding: 0.625rem 0.75rem; background: var(--background); border: 1px solid var(--border-light); border-radius: 6px; color: var(--text); font-size: 0.9375rem; font-family: inherit; outline: none; transition: border-color 0.15s; }
.surfdoc-form-field input:focus, .surfdoc-form-field textarea:focus, .surfdoc-form-field select:focus { border-color: var(--accent); }
.surfdoc-form-field select { appearance: auto; }

/* ============================================================
   46. SURFDOC GALLERY
   ============================================================ */

.surfdoc-gallery { margin: 1.5rem 0; }
.surfdoc-gallery-filters { display: flex; gap: 0.5rem; margin-bottom: 1rem; flex-wrap: wrap; }
.surfdoc-gallery-filters .filter-btn { padding: 0.375rem 0.875rem; border: 1px solid var(--border-light); background: transparent; color: var(--text-muted); border-radius: 20px; font-size: 0.8rem; cursor: pointer; transition: all 0.15s; }
.surfdoc-gallery-filters .filter-btn:hover { color: var(--text); border-color: var(--text-faint); }
.surfdoc-gallery-filters .filter-btn.active { background: var(--accent); color: var(--accent-text, #fff); border-color: var(--accent); }
.surfdoc-gallery-grid { display: grid; gap: 1rem; }
.surfdoc-gallery[data-cols="2"] .surfdoc-gallery-grid { grid-template-columns: repeat(2, 1fr); }
.surfdoc-gallery[data-cols="3"] .surfdoc-gallery-grid { grid-template-columns: repeat(3, 1fr); }
.surfdoc-gallery[data-cols="4"] .surfdoc-gallery-grid { grid-template-columns: repeat(4, 1fr); }
.surfdoc-gallery-item { margin: 0; overflow: hidden; border-radius: 8px; border: 1px solid var(--border); }
.surfdoc-gallery-item img { width: 100%; aspect-ratio: 4/3; object-fit: cover; display: block; transition: transform 0.2s; }
.surfdoc-gallery-item:hover img { transform: scale(1.03); }
.surfdoc-gallery-item figcaption { padding: 0.5rem 0.75rem; font-size: 0.8rem; color: var(--text-muted); background: var(--surface); }

/* ============================================================
   47. SURFDOC FOOTER
   ============================================================ */

.surfdoc-footer { margin-top: 3rem; padding: 2rem 0; border-top: 1px solid var(--border); width: 100vw; margin-left: calc(-50vw + 50%); padding-left: calc(50vw - 50%); padding-right: calc(50vw - 50%); background: var(--surface); }
.surfdoc-footer-sections { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 2rem; margin-bottom: 1.5rem; }
.surfdoc-footer-col h4 { font-size: 0.8rem; font-weight: 600; color: var(--text); text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 0.75rem; }
.surfdoc-footer-col ul { list-style: none; padding: 0; }
.surfdoc-footer-col li { margin: 0.25rem 0; }
.surfdoc-footer-col a { color: var(--text-muted); text-decoration: none; font-size: 0.875rem; transition: color 0.15s; }
.surfdoc-footer-col a:hover { color: var(--text); text-decoration: none; }
.surfdoc-footer-social { display: flex; gap: 1rem; margin-bottom: 1rem; }
.surfdoc-footer-social .social-link { color: var(--text-muted); text-decoration: none; font-size: 0.875rem; text-transform: capitalize; transition: color 0.15s; }
.surfdoc-footer-social .social-link:hover { color: var(--accent); }
.surfdoc-footer-copyright { font-size: 0.8rem; color: var(--text-faint); }

/* ============================================================
   48. SURFDOC DETAILS / COLLAPSIBLE
   ============================================================ */

.surfdoc-details { margin: 1rem 0; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.surfdoc-details summary { padding: 0.75rem 1rem; font-weight: 600; cursor: pointer; background: var(--surface); color: var(--text); font-size: 0.95rem; }
.surfdoc-details summary:hover { background: var(--surface-hover); }
.surfdoc-details-content { padding: 0.75rem 1rem; border-top: 1px solid var(--border); }

/* ============================================================
   48b. SURFDOC TABLE WRAP (responsive scroll)
   ============================================================ */

.surfdoc-table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 1rem 0; border-radius: 8px; }

/* ============================================================
   49. SURFDOC DIVIDERS
   ============================================================ */

.surfdoc-divider { display: flex; align-items: center; gap: 1rem; margin: 2rem 0; color: var(--text-faint); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; }
.surfdoc-divider::before, .surfdoc-divider::after { content: ""; flex: 1; border-top: 1px solid var(--border); }
.surfdoc-divider-plain { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }


/* ============================================================
   50. SURFDOC HERO
   ============================================================ */

.surfdoc-hero { margin: 2rem 0; padding: 3rem 0; text-align: center; }
.surfdoc-hero-left { text-align: left; }
.surfdoc-hero-inner { max-width: 640px; margin: 0 auto; }
.surfdoc-hero-left .surfdoc-hero-inner { margin: 0; max-width: none; display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center; }
.surfdoc-hero-badge { display: inline-flex; align-items: center; gap: 0.5rem; border: 1px solid var(--border); background: var(--surface); border-radius: 9999px; padding: 0.25rem 0.75rem; font-size: 0.75rem; font-family: var(--font-mono); color: var(--text-muted); margin-bottom: 1.5rem; }
.surfdoc-hero-headline { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 700; color: var(--text); line-height: 1.1; margin: 0 0 1rem; }
.surfdoc-hero-subtitle { font-size: 1.125rem; color: var(--text-muted); line-height: 1.6; margin: 0 0 2rem; max-width: 520px; }
.surfdoc-hero:not(.surfdoc-hero-left) .surfdoc-hero-subtitle { margin-left: auto; margin-right: auto; }
.surfdoc-hero-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.surfdoc-hero:not(.surfdoc-hero-left) .surfdoc-hero-actions { justify-content: center; }
.surfdoc-hero-btn { display: inline-flex; align-items: center; justify-content: center; padding: 0.75rem 1.5rem; border-radius: 8px; font-size: 0.9rem; font-weight: 500; text-decoration: none; transition: all 0.15s; min-height: 44px; }
.surfdoc-hero-btn-primary { background: var(--accent); color: var(--accent-text, #fff); border: 1px solid var(--accent); }
.surfdoc-hero-btn-primary:hover { filter: brightness(1.1); transform: translateY(-1px); }
.surfdoc-hero-btn-secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }
.surfdoc-hero-btn-secondary:hover { border-color: var(--text-faint); background: var(--surface); }
.surfdoc-hero-image { margin-bottom: 1.5rem; }
.surfdoc-hero-image img { max-height: 280px; border-radius: 12px; }
.surfdoc-hero-image-side { display: flex; align-items: center; justify-content: center; }
.surfdoc-hero-image-side img { max-width: 100%; border-radius: 12px; border: 1px solid var(--border); }

/* ============================================================
   51. SURFDOC FEATURES
   ============================================================ */

.surfdoc-features { display: grid; gap: 1.5rem; margin: 2rem 0; }
.surfdoc-features[data-cols="2"] { grid-template-columns: repeat(2, 1fr); }
.surfdoc-features[data-cols="3"] { grid-template-columns: repeat(3, 1fr); }
.surfdoc-features[data-cols="4"] { grid-template-columns: repeat(4, 1fr); }
.surfdoc-features:not([data-cols]) { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.surfdoc-feature-card { padding: 1.5rem; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); transition: border-color 0.15s, transform 0.15s; }
.surfdoc-feature-card:hover { border-color: var(--text-faint); transform: translateY(-2px); }
.surfdoc-feature-icon { display: inline-flex; align-items: center; justify-content: center; width: 2.25rem; height: 2.25rem; border-radius: 8px; background: rgba(59, 130, 246, 0.1); color: var(--accent); font-size: 1rem; margin-bottom: 0.75rem; }
.surfdoc-feature-title { font-size: 1rem; font-weight: 600; color: var(--text); margin: 0 0 0.5rem; }
.surfdoc-feature-body { font-size: 0.875rem; color: var(--text-muted); line-height: 1.6; margin: 0; }
.surfdoc-feature-link { display: inline-block; margin-top: 0.75rem; font-size: 0.875rem; color: var(--accent); text-decoration: none; font-weight: 500; }
.surfdoc-feature-link:hover { text-decoration: underline; }

/* ============================================================
   52. SURFDOC STEPS
   ============================================================ */

.surfdoc-steps { list-style: none; padding: 0; margin: 2rem 0; counter-reset: none; }
.surfdoc-step { display: flex; gap: 1rem; padding: 1.25rem 0; border-bottom: 1px solid var(--border); }
.surfdoc-step:last-child { border-bottom: none; }
.surfdoc-step-number { display: flex; align-items: center; justify-content: center; width: 2rem; height: 2rem; border-radius: 9999px; background: rgba(59, 130, 246, 0.1); color: var(--accent); font-size: 0.8rem; font-weight: 700; font-family: var(--font-mono); flex-shrink: 0; margin-top: 0.125rem; }
.surfdoc-step-content { flex: 1; min-width: 0; }
.surfdoc-step-title { font-size: 1rem; font-weight: 600; color: var(--text); margin: 0 0 0.25rem; display: flex; align-items: center; gap: 0.75rem; }
.surfdoc-step-time { font-size: 0.75rem; color: var(--text-muted); font-weight: 400; }
.surfdoc-step-body { font-size: 0.875rem; color: var(--text-muted); line-height: 1.6; margin: 0; }

/* ============================================================
   53. SURFDOC STATS
   ============================================================ */

.surfdoc-stats { display: flex; flex-wrap: wrap; gap: 1rem; margin: 2rem 0; }
.surfdoc-stat { flex: 1; min-width: 120px; text-align: center; padding: 1rem; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); }
.surfdoc-stat-value { display: block; font-size: 1.75rem; font-weight: 700; color: var(--text); line-height: 1.2; }
.surfdoc-stat-label { display: block; font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; margin-top: 0.25rem; }

/* ============================================================
   54. SURFDOC COMPARISON
   ============================================================ */

.surfdoc-comparison { width: 100%; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; border-collapse: collapse; margin: 1.5rem 0; font-size: 0.875rem; }
.surfdoc-comparison thead tr { background: var(--surface); border-bottom: 1px solid var(--border); }
.surfdoc-comparison th { text-align: center; padding: 0.625rem 1rem; font-weight: 500; color: var(--text); }
.surfdoc-comparison th:first-child { text-align: left; }
.surfdoc-comparison td { text-align: center; padding: 0.5rem 1rem; color: var(--text-muted); border-bottom: 1px solid var(--border); }
.surfdoc-comparison td:first-child { text-align: left; font-weight: 500; color: var(--text); }
.surfdoc-comparison tbody tr:last-child td { border-bottom: none; }
.surfdoc-comparison-highlight { background: rgba(59, 130, 246, 0.06); }
.surfdoc-comparison th.surfdoc-comparison-highlight { color: var(--accent); font-weight: 700; }
.surfdoc-check { color: #22c55e; font-weight: 700; font-size: 1rem; }
.surfdoc-dash { color: var(--text-faint); font-size: 1rem; }

/* ============================================================
   55. SURFDOC LOGO
   ============================================================ */

.surfdoc-logo { margin: 2rem 0; text-align: center; }
.surfdoc-logo img { display: inline-block; }

/* ============================================================
   56. SURFDOC TOC
   ============================================================ */

.surfdoc-toc { margin: 1.5rem 0; padding: 1rem; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); }
.surfdoc-toc ul { list-style: none; padding: 0; margin: 0; border-left: 1px solid var(--border); }
.surfdoc-toc-item { margin: 0; }
.surfdoc-toc-item a { display: block; padding: 0.25rem 0 0.25rem 0.75rem; margin-left: -1px; border-left: 1px solid transparent; color: var(--text-muted); text-decoration: none; font-size: 0.875rem; transition: color 0.15s, border-color 0.15s; }
.surfdoc-toc-item a:hover { color: var(--text); border-left-color: var(--border); }
.surfdoc-toc-l2 a { padding-left: 0.75rem; }
.surfdoc-toc-l3 a { padding-left: 1.5rem; }

/* ============================================================
   57. SURFDOC BEFORE-AFTER
   ============================================================ */

.surfdoc-before-after { margin: 2rem 0; }
.surfdoc-ba-before, .surfdoc-ba-after { display: grid; gap: 0.75rem; margin: 0.75rem 0; }
.surfdoc-ba-heading { font-size: 0.875rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-muted); margin: 0 0 0.25rem; }
.surfdoc-ba-item { display: flex; align-items: baseline; gap: 0.75rem; padding: 0.75rem 1rem; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); }
.surfdoc-ba-item strong { white-space: nowrap; }
.surfdoc-ba-item span { color: var(--text-muted); }
.surfdoc-ba-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.surfdoc-ba-dot-red { background: #ef4444; }
.surfdoc-ba-dot-green { background: #22c55e; }
.surfdoc-ba-item-green { border-color: rgba(34, 197, 94, 0.3); }
.surfdoc-ba-transition { display: flex; align-items: center; gap: 1rem; margin: 1.25rem 0; }
.surfdoc-ba-line { flex: 1; height: 1px; background: var(--border); }
.surfdoc-ba-label { font-size: 0.875rem; font-weight: 600; color: var(--accent, #3b82f6); white-space: nowrap; }

/* ============================================================
   58. SURFDOC PIPELINE
   ============================================================ */

.surfdoc-pipeline { display: flex; align-items: stretch; gap: 0; margin: 2rem 0; flex-wrap: wrap; justify-content: center; }
.surfdoc-pipeline-step { display: flex; flex-direction: column; align-items: center; gap: 0.25rem; padding: 1rem 1.25rem; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); text-align: center; min-width: 120px; }
.surfdoc-pipeline-label { font-size: 0.9375rem; }
.surfdoc-pipeline-desc { font-size: 0.8125rem; color: var(--text-muted); }
.surfdoc-pipeline-arrow { display: flex; align-items: center; padding: 0 0.5rem; font-size: 1.25rem; color: var(--text-muted); }
@media (max-width: 640px) {
    .surfdoc-pipeline { flex-direction: column; align-items: center; }
    .surfdoc-pipeline-arrow { transform: rotate(90deg); padding: 0.25rem 0; }
}

/* ============================================================
   59. SURFDOC SECTION
   ============================================================ */

.surfdoc-section { margin: 0; padding: 3rem 0; }
.surfdoc-section-inner { max-width: 72rem; margin: 0 auto; padding: 0 1.5rem; }
.surfdoc-section-header { text-align: center; margin-bottom: 2rem; }
.surfdoc-section-header h2 { font-size: 1.75rem; margin: 0 0 0.5rem; }
.surfdoc-section-header p { font-size: 1.125rem; color: var(--text-muted); margin: 0; }
.section-muted { background: var(--surface); margin-left: calc(-50vw + 50%); margin-right: calc(-50vw + 50%); padding-left: calc(50vw - 50%); padding-right: calc(50vw - 50%); }
.section-dark { background: var(--surface-alt); margin-left: calc(-50vw + 50%); margin-right: calc(-50vw + 50%); padding-left: calc(50vw - 50%); padding-right: calc(50vw - 50%); }

/* ============================================================
   60. SURFDOC PRODUCT CARD
   ============================================================ */

.surfdoc-product-card { border: 1px solid var(--border); border-radius: 12px; padding: 1.5rem; background: var(--surface); margin: 1rem 0; }
.surfdoc-product-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.surfdoc-product-titles { flex: 1; }
.surfdoc-product-title { margin: 0; font-size: 1.25rem; }
.surfdoc-product-subtitle { margin: 0.25rem 0 0; color: var(--text-muted); font-size: 0.9375rem; }
.surfdoc-badge { display: inline-block; padding: 0.2rem 0.6rem; border-radius: 9999px; font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; background: rgba(107, 114, 128, 0.15); color: var(--text-muted); }
.surfdoc-badge-green { background: rgba(34, 197, 94, 0.15); color: #22c55e; }
.surfdoc-badge-yellow { background: rgba(234, 179, 8, 0.15); color: #eab308; }
.surfdoc-badge-blue { background: rgba(59, 130, 246, 0.15); color: #3b82f6; }
.surfdoc-badge-red { background: rgba(239, 68, 68, 0.15); color: #ef4444; }
.surfdoc-product-body { margin-bottom: 1rem; color: var(--text-muted); }
.surfdoc-product-body p { margin: 0; }
.surfdoc-product-features { list-style: none; padding: 0; margin: 0 0 1rem; }
.surfdoc-product-features li { padding: 0.25rem 0; padding-left: 1.25rem; position: relative; color: var(--text-muted); }
.surfdoc-product-features li::before { content: "\2713"; position: absolute; left: 0; color: #22c55e; font-weight: 700; }
.surfdoc-product-cta { display: inline-block; padding: 0.5rem 1.25rem; border-radius: 8px; background: var(--accent, #3b82f6); color: var(--accent-text, #fff); text-decoration: none; font-weight: 600; font-size: 0.875rem; transition: opacity 0.15s; }
.surfdoc-product-cta:hover { opacity: 0.9; }

/* ================================================================
   ================================================================
   LIGHT MODE — SURFDOC CONTENT OVERRIDES
   ================================================================
   ================================================================ */

/* Explicit light mode */
[data-theme="light"] .surfdoc strong { color: #111; }
[data-theme="light"] .surfdoc pre { background: #f6f8fa !important; }
[data-theme="light"] .surfdoc pre code { color: #24292e; }
[data-theme="light"] .surfdoc code { background: rgba(0,0,0,0.04); }
[data-theme="light"] .surfdoc-metric .value { color: #111; }
[data-theme="light"] .surfdoc tr:hover td { background: rgba(0,0,0,0.02); }
[data-theme="light"] .surfdoc-data tr:hover td { background: rgba(0,0,0,0.02); }
[data-theme="light"] .surfdoc-pricing tr:hover td { background: rgba(0,0,0,0.02); }

/* Auto-detect light mode */
@media (prefers-color-scheme: light) {
    :root:not([data-theme]) .surfdoc strong { color: #111; }
    :root:not([data-theme]) .surfdoc pre { background: #f6f8fa !important; }
    :root:not([data-theme]) .surfdoc pre code { color: #24292e; }
    :root:not([data-theme]) .surfdoc code { background: rgba(0,0,0,0.04); }
    :root:not([data-theme]) .surfdoc-metric .value { color: #111; }
    :root:not([data-theme]) .surfdoc tr:hover td { background: rgba(0,0,0,0.02); }
    :root:not([data-theme]) .surfdoc-data tr:hover td { background: rgba(0,0,0,0.02); }
    :root:not([data-theme]) .surfdoc-pricing tr:hover td { background: rgba(0,0,0,0.02); }
}


/* ================================================================
   ================================================================
   RESPONSIVE
   ================================================================
   ================================================================ */

/* ============================================================
   50. RESPONSIVE (768px — app chrome)
   ============================================================ */

@media (max-width: 768px) {
    .hero-inner {
        padding: 96px 24px 64px;
    }

    .hero-headline { font-size: 2rem; }

    .section-inner { padding: 56px 16px; }

    /* Nav mobile */
    .nav-toggle { display: flex; }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 2px;
        padding: 8px 16px 16px;
        background: rgba(10, 10, 15, 0.96);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--border);
    }

    [data-theme="light"] .nav-links {
        background: rgba(255, 255, 255, 0.96);
    }

    .nav-links.open { display: flex; }

    .nav-links a {
        padding: 10px 12px;
        font-size: 0.9375rem;
    }

    /* Grids */
    .card-grid,
    .capability-grid { grid-template-columns: 1fr; }

    .stats-grid { grid-template-columns: repeat(2, 1fr); }

    .form-row { grid-template-columns: 1fr; }

    /* Footer */
    .footer-columns { grid-template-columns: 1fr; gap: 32px; }

    /* Tables */
    .comparison-table { font-size: 0.8125rem; }
    .comparison-table th,
    .comparison-table td { padding: 10px 12px; }

    .hide-mobile { display: none; }

    /* Nav: hide "Log in" text on mobile, keep CTA + hamburger */
    .nav-actions .nav-link { display: none; }
    .nav-actions { gap: 6px; }
    .nav-cta { font-size: 0.75rem; padding: 5px 10px; }

    /* Sub-nav mobile */
    .sub-nav-inner { padding: 6px 1rem; gap: 2px; }
    .sub-nav-link { font-size: 0.75rem; padding: 4px 10px; }
}

/* ============================================================
   51. RESPONSIVE (640px — SurfDoc content)
   ============================================================ */

@media (max-width: 640px) {
    /* SurfDoc nav mobile */
    .surfdoc-nav-hamburger { display: flex; }
    .surfdoc-nav-logo { margin-right: 0; }
    .surfdoc-nav-links { display: none; flex-direction: column; align-items: stretch; position: absolute; top: 100%; left: 0; right: 0; background: var(--surface); padding: 0.5rem 1rem; border-bottom: 1px solid var(--border); box-shadow: 0 4px 12px rgba(0,0,0,0.2); }
    .surfdoc-nav-links a { padding: 0.625rem 0.75rem; font-size: 1rem; }
    .surfdoc-nav-toggle:checked ~ .surfdoc-nav-links { display: flex; }
    .surfdoc-nav-toggle:checked ~ .surfdoc-nav-hamburger span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
    .surfdoc-nav-toggle:checked ~ .surfdoc-nav-hamburger span:nth-child(2) { opacity: 0; }
    .surfdoc-nav-toggle:checked ~ .surfdoc-nav-hamburger span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

    /* SurfDoc columns */
    .surfdoc-columns { grid-template-columns: 1fr !important; }

    /* SurfDoc pages */
    .surfdoc-page[data-layout="split"] { grid-template-columns: 1fr; }
    .surfdoc-page[data-layout="hero"] h1 { font-size: 1.75rem; }

    /* SurfDoc gallery */
    .surfdoc-gallery-grid { grid-template-columns: repeat(2, 1fr) !important; }

    /* SurfDoc footer */
    .surfdoc-footer-sections { grid-template-columns: repeat(2, 1fr); }

    /* SurfDoc hero */
    .surfdoc-hero-left .surfdoc-hero-inner { grid-template-columns: 1fr; }
    .surfdoc-hero-image-side { display: none; }
    .surfdoc-hero-headline { font-size: 2rem; }

    /* SurfDoc features */
    .surfdoc-features { grid-template-columns: 1fr !important; }

    /* SurfDoc stats */
    .surfdoc-stats { flex-direction: column; }
    .surfdoc-stat { min-width: 0; }

    /* SurfDoc comparison — scrollable on mobile */
    .surfdoc-section-inner { overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .surfdoc-comparison { font-size: 0.75rem; min-width: 480px; }
    .surfdoc-comparison th, .surfdoc-comparison td { padding: 0.375rem 0.5rem; white-space: nowrap; }

    /* SurfDoc steps — prevent overflow */
    .surfdoc-step { flex-direction: column; gap: 0.5rem; }
    .surfdoc-step-body code { word-break: break-all; }
}

/* ============================================================
   52. REDUCED MOTION
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}