/* === Design Tokens === */
:root {
    --bg: #000000;
    --bg-card: #111111;
    --bg-code: #161616;
    --bg-hover: #1a1a1a;
    --text: #e8e8e8;
    --text-dim: #888888;
    --text-code: #cccccc;
    --accent: #ffffff;
    --accent-light: #cccccc;
    --accent-glow: rgba(255, 255, 255, .06);
    --border: #2a2a2a;
    --green: #4ade80;
    --red: #f87171;
    --yellow: #fbbf24;
    --radius: 12px;
    --radius-sm: 8px;
    --font: 'Inter', -apple-system, sans-serif;
    --mono: 'JetBrains Mono', monospace;
    --max-w: 960px;
}

[data-theme="light"] {
    --bg: #ffffff;
    --bg-card: #f5f5f5;
    --bg-code: #f0f0f0;
    --bg-hover: #eaeaea;
    --text: #111111;
    --text-dim: #666666;
    --text-code: #333333;
    --border: #dddddd;
    --accent: #000000;
    --accent-light: #333333;
    --accent-glow: rgba(0, 0, 0, .04);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 72px;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

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

a:hover {
    text-decoration: underline;
}

img {
    max-width: 100%;
}

.container {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
}

/* === Top Bar === */
.top-bar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(0, 0, 0, .85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
}

[data-theme="light"] .top-bar {
    background: rgba(255, 255, 255, .9);
}

.top-bar-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.logo {
    font-weight: 800;
    font-size: 1.1rem;
    color: var(--text);
    letter-spacing: -.02em;
}

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

.top-bar-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.icon-btn {
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 6px 10px;
    cursor: pointer;
    font-size: .9rem;
    color: var(--text);
    transition: .2s;
}

.icon-btn:hover {
    border-color: var(--accent);
    background: var(--accent-glow);
}

.lang-switch {
    display: flex;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.lang-btn {
    background: none;
    border: none;
    padding: 6px 14px;
    cursor: pointer;
    font-size: .8rem;
    font-weight: 600;
    color: var(--text-dim);
    transition: .2s;
    font-family: var(--font);
}

.lang-btn.active {
    background: var(--accent);
    color: var(--bg);
}

.lang-btn:hover:not(.active) {
    background: var(--accent-glow);
}

/* === Hero === */
.hero {
    position: relative;
    padding: 100px 0 70px;
    text-align: center;
    overflow: hidden;
}

.hero-glow {
    position: absolute;
    top: -120px;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    pointer-events: none;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 20px;
    background: var(--accent-glow);
    border: 1px solid var(--accent);
    font-size: .8rem;
    font-weight: 600;
    color: var(--accent-light);
    margin-bottom: 20px;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 800;
    letter-spacing: -.03em;
    line-height: 1.15;
    margin-bottom: 16px;
}

.hero-sub {
    font-size: 1.05rem;
    color: var(--text-dim);
    line-height: 1.6;
    max-width: 540px;
    margin: 0 auto 32px;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: .9rem;
    transition: .2s;
    font-family: var(--font);
}

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

.btn-secondary {
    background: transparent;
    color: var(--accent);
    border: 1.5px solid var(--accent);
    font-weight: 600;
}

.btn-secondary:hover {
    background: var(--accent);
    color: var(--bg);
}

.waitlist-box {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    margin-top: 12px;
}

.waitlist-box .btn {
    display: inline-block;
    text-align: center;
}

.btn-primary:hover {
    background: var(--accent-light);
    text-decoration: none;
    transform: translateY(-1px);
}

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

.btn-ghost:hover {
    border-color: var(--accent);
    background: var(--accent-glow);
    text-decoration: none;
}

/* === TOC === */
.toc-section {
    padding: 60px 0;
}

.toc-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 24px;
    text-align: center;
}

.toc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 8px;
}

.toc-item {
    display: block;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    border: 1px solid var(--border);
    font-size: .85rem;
    font-weight: 500;
    color: var(--text);
    transition: .2s;
}

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

.toc-num {
    color: var(--accent);
    font-weight: 700;
    margin-right: 6px;
}

/* === Main === */
.main-content {
    padding: 20px 0 80px;
}

.section {
    margin-bottom: 72px;
    scroll-margin-top: 72px;
}

.section h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border);
    display: flex;
    align-items: center;
    gap: 12px;
}

.section-num {
    color: var(--accent);
    font-size: .9rem;
    font-weight: 800;
}

.section h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin: 28px 0 12px;
}

.section p {
    margin-bottom: 16px;
    color: var(--text);
}

blockquote {
    border-left: 3px solid var(--accent);
    padding: 12px 20px;
    margin: 16px 0;
    background: var(--accent-glow);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-style: italic;
    font-weight: 600;
    font-size: 1.05rem;
}

/* === Tables === */
.table-wrap {
    overflow-x: auto;
    margin: 16px 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: .88rem;
}

th,
td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    font-weight: 600;
    color: var(--accent-light);
    background: var(--bg-code);
    white-space: nowrap;
}

td {
    color: var(--text);
}

td:first-child {
    white-space: nowrap;
}

/* === Code === */
pre {
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 18px 20px;
    overflow-x: auto;
    margin: 16px 0;
    font-size: .84rem;
    line-height: 1.65;
}

code {
    font-family: var(--mono);
    color: var(--text-code);
}

pre code {
    display: block;
}

.c {
    color: var(--text-dim);
}

kbd {
    display: inline-block;
    padding: 2px 8px;
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: var(--mono);
    font-size: .8rem;
}

/* === Cards === */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin: 16px 0;
}

.product-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 20px;
    transition: .3s;
    text-align: center;
}

.product-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 8px 32px var(--accent-glow);
}

.product-icon {
    font-size: .85rem;
    font-family: var(--mono);
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--accent);
    letter-spacing: .05em;
}

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

.product-card p {
    font-size: .85rem;
    color: var(--text-dim);
    margin: 0;
}

/* === Two-Column === */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

/* === Section 11: Command Surfaces === */
.command-guide>p {
    color: var(--text-dim);
    font-size: .9rem;
}

.command-surfaces {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin: 14px 0;
}

.command-surface {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 14px 10px;
}

.command-surface-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 6px;
}

.command-surface-head h4 {
    margin: 0;
    font-size: .98rem;
}

.surface-badge {
    font-family: var(--mono);
    font-size: .72rem;
    letter-spacing: .06em;
    padding: 4px 10px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--bg-code);
    color: var(--accent-light);
}

.command-surface .table-wrap {
    margin: 8px 0 6px;
}

.command-surface table {
    font-size: .84rem;
}

.command-surface td:first-child {
    width: 124px;
}

.command-surface td code {
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 3px 8px;
    color: var(--accent-light);
}

.command-note {
    margin: 4px 2px 0;
    font-size: .82rem;
    color: var(--text-dim);
}

.command-refs {
    margin-top: 14px;
    font-size: .84rem;
    color: var(--text-dim);
}

.command-refs a {
    display: inline-block;
    margin: 3px 6px 3px 0;
    padding: 4px 10px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--bg-card);
    color: var(--text);
}

.command-refs a:hover {
    text-decoration: none;
    border-color: var(--accent);
    background: var(--accent-glow);
}

.shortcut-panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    margin-top: 2px;
}

@media (max-width: 640px) {
    .two-col {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1080px) {
    .command-surfaces {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 760px) {
    .command-surfaces {
        grid-template-columns: 1fr;
    }

    .command-surface td:first-child {
        width: auto;
    }
}

/* === Features === */
.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 12px;
    margin: 16px 0;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: .9rem;
}

.feature-icon {
    font-size: 1.3rem;
}

.feature-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 16px 0;
}

.chip {
    padding: 8px 16px;
    border-radius: 20px;
    background: var(--accent-glow);
    border: 1px solid var(--accent);
    font-size: .82rem;
    font-weight: 500;
    color: var(--accent-light);
}

.badge {
    font-size: .7rem;
    padding: 2px 8px;
    border-radius: 10px;
    background: var(--accent);
    color: var(--bg);
    margin-left: 6px;
    vertical-align: middle;
}

/* === Steps === */
.steps {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin: 16px 0;
}

.step {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}

.step-num {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent);
    color: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: .85rem;
    flex-shrink: 0;
}

/* === Callout === */
.callout {
    background: var(--accent-glow);
    border: 1px solid var(--accent);
    border-radius: var(--radius-sm);
    padding: 18px 20px;
    margin: 16px 0;
}

.callout strong {
    display: block;
    margin-bottom: 6px;
}

.callout p {
    margin: 0;
    font-size: .9rem;
    color: var(--text);
}

/* === Tips === */
.tip-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.tip-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
}

.tip-card h4 {
    font-size: .95rem;
    margin-bottom: 12px;
    color: var(--accent-light);
}

.tip-card pre {
    margin: 0;
    font-size: .8rem;
}

/* === FAQ === */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

details {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0;
    transition: .2s;
}

details[open] {
    border-color: var(--accent);
}

summary {
    padding: 14px 18px;
    cursor: pointer;
    font-weight: 600;
    font-size: .95rem;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

summary::before {
    content: '▸';
    color: var(--accent);
    transition: .2s;
}

details[open] summary::before {
    transform: rotate(90deg);
}

summary::-webkit-details-marker {
    display: none;
}

details p {
    padding: 0 18px 14px;
    color: var(--text-dim);
    font-size: .9rem;
}

/* === Links Grid === */
.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: 10px;
}

.link-card {
    display: block;
    text-align: center;
    padding: 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: .88rem;
    transition: .2s;
    color: var(--text);
}

.link-card:hover {
    border-color: var(--accent);
    transform: translateY(-1px);
    text-decoration: none;
}

/* === Screenshots === */
.screenshot {
    margin: 16px 0 24px;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    background: var(--bg-code);
}

.screenshot img {
    width: 100%;
    display: block;
    transition: transform .3s ease;
}

.screenshot:hover img {
    transform: scale(1.01);
}

.screenshot figcaption {
    padding: 10px 16px;
    font-size: .82rem;
    color: var(--text-dim);
    text-align: center;
    border-top: 1px solid var(--border);
}

/* === Footer === */
.footer {
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid var(--border);
    background: var(--bg-card);
}

.footer p {
    margin-bottom: 8px;
    font-size: .9rem;
}

.footer-meta {
    font-size: .8rem;
    color: var(--text-dim);
}

.footer-contrib {
    font-size: .85rem;
    color: var(--text-dim);
    margin-bottom: 12px;
}

.callout-inline {
    font-size: .85rem;
    color: var(--text-dim);
    margin-top: 8px;
}

/* === Scrollbar === */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

/* === Responsive === */
@media (max-width: 640px) {
    .hero {
        padding: 70px 0 50px;
    }

    .hero-title {
        font-size: 1.8rem;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }

    .toc-grid {
        grid-template-columns: 1fr 1fr;
    }

    .tip-grid {
        grid-template-columns: 1fr;
    }

    .feature-list {
        grid-template-columns: 1fr;
    }

    .section h2 {
        font-size: 1.3rem;
    }
}

/* === Model Cards === */
.section-credit {
    font-size: .8rem;
    color: var(--text-dim);
    margin: -8px 0 16px;
    font-style: italic;
}

.model-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
    margin: 16px 0;
}

.model-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: .3s;
}

.model-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 8px 32px var(--accent-glow);
}

.model-banner {
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--mono);
    font-size: .85rem;
    font-weight: 700;
    color: var(--accent);
    background: var(--bg-code);
    border-bottom: 1px solid var(--border);
}

.model-body {
    padding: 16px 18px;
}

.model-desc {
    font-size: .84rem;
    color: var(--text-dim);
    line-height: 1.55;
    margin-bottom: 12px;
    min-height: 48px;
}

.model-cmd {
    font-family: var(--mono);
    font-size: .75rem;
    color: var(--text-dim);
    background: var(--bg-code);
    padding: 6px 10px;
    border-radius: 4px;
    margin-bottom: 14px;
    text-align: center;
}

.model-features {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.model-feat-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 7px 0;
    border-top: 1px solid var(--border);
    font-size: .8rem;
}

.model-feat-label {
    color: var(--text);
}

.model-feat-value {
    display: flex;
    gap: 3px;
    align-items: center;
}

.dot-filled {
    width: 14px;
    height: 14px;
    display: inline-block;
    color: var(--accent);
    font-size: .75rem;
}

.dot-empty {
    width: 14px;
    height: 14px;
    display: inline-block;
    color: var(--border);
    font-size: .75rem;
}

.check-yes {
    color: var(--green);
    font-size: .9rem;
}

.check-no {
    color: var(--red);
    font-size: .9rem;
}

.model-card.collapsible .model-features {
    display: none;
}

.model-card.collapsible.expanded .model-features {
    display: flex;
}

.model-toggle {
    display: block;
    width: 100%;
    text-align: center;
    padding: 8px 0;
    border: none;
    border-top: 1px solid var(--border);
    background: transparent;
    color: var(--text-dim);
    font-size: .78rem;
    font-family: var(--font);
    cursor: pointer;
    transition: .2s;
}

.model-toggle:hover {
    color: var(--accent);
    background: var(--accent-glow);
}

.section h4 {
    font-size: 1.05rem;
    font-weight: 600;
    margin: 24px 0 12px;
}

/* === Fade-in Animation === */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity .5s ease, transform .5s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}