:root {
    --bg: #0d0d0d;
    --surface: #141414;
    --border: #222222;
    --accent: #7c5cfc;
    --accent-h: #9b7dff;
    --text: #e8e8e8;
    --muted: #888888;
    --code-bg: #111122;
    --max-w: 1100px;
}
html {
    font-size: 16px;
    scroll-behavior: smooth;
}
body {
    background: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, sans-serif;
    line-height: 1.65;
    margin: 0;
}
a {
    color: inherit;
    text-decoration: none;
}
p {
    color: var(--muted);
    max-width: 64ch;
    margin-bottom: 1rem;
}
h1 {
    letter-spacing: -0.04em;
    line-height: 1.1;
}
h2 {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 1.25rem;
}
h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}
pre {
    margin: 0;
    overflow-x: auto;
}
code {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.9em;
}
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(13,13,13,0.88);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}
.nav-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 2rem;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.nav-logo {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}
.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}
.nav-link {
    color: var(--muted);
    font-size: 0.9rem;
    transition: color 0.15s;
}
.nav-link:hover {
    color: var(--text);
}
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4em;
    padding: 0.65em 1.4em;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    border: none;
}
.btn-primary {
    background: var(--accent);
    color: #ffffff;
}
.btn-primary:hover {
    background: var(--accent-h);
}
.btn-ghost {
    border: 1px solid var(--border);
    color: var(--text);
    background: transparent;
}
.btn-ghost:hover {
    border-color: #444444;
    background: #1a1a1a;
}
.btn-sm {
    padding: 0.4em 1em;
    font-size: 0.85rem;
}
.section-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 5rem 2rem;
}
.section-label {
    display: block;
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--accent);
    margin-bottom: 1rem;
}
.hero {
    padding: 7rem 0 5rem;
    text-align: center;
    border-bottom: 1px solid var(--border);
}
.hero-badge {
    display: inline-block;
    background: rgba(124,92,252,0.12);
    border: 1px solid rgba(124,92,252,0.3);
    color: var(--accent);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.3em 1em;
    border-radius: 999px;
    margin-bottom: 2rem;
    letter-spacing: 0.05em;
}
.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    margin-bottom: 1.5rem;
    color: var(--text);
}
.hero-sub {
    font-size: 1.15rem;
    max-width: 58ch;
    margin: 0 auto 2.5rem;
    color: var(--muted);
}
.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 3rem;
}
.hero-prompt {
    display: inline-block;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.75rem 1.5rem;
    color: var(--accent);
    font-size: 0.9rem;
}
.problem {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}
.problem-lead {
    font-size: 1.1rem;
    color: var(--text);
    font-weight: 500;
    margin-top: 1.5rem;
}
.features {
    border-bottom: 1px solid var(--border);
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.25rem;
    margin-top: 3rem;
}
.feature {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.75rem;
    transition: border-color 0.2s;
}
.feature:hover {
    border-color: var(--accent);
}
.feature-title {
    color: var(--text);
}
.feature-body {
    font-size: 0.875rem;
    margin: 0;
    max-width: none;
}
.demo {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}
.demo-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 2.5rem;
}
.demo-panel {
    display: flex;
    flex-direction: column;
}
.demo-label {
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--muted);
    margin-bottom: 0.75rem;
}
.demo-code {
    flex: 1;
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.5rem;
    font-size: 0.85rem;
    line-height: 1.65;
    color: #c9d1d9;
}
.demo-out {
    border-color: rgba(124,92,252,0.35);
}
.cta {
    text-align: center;
    border-bottom: 1px solid var(--border);
}
.cta-sub {
    max-width: none;
    margin-bottom: 2rem;
}
.cta-btns {
    display: flex;
    gap: 1rem;
    justify-content: center;
}
.footer {
    background: var(--surface);
}
.footer-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 2.5rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}
.footer-brand {
    font-weight: 700;
    font-size: 1rem;
}
.footer-links {
    display: flex;
    gap: 2rem;
}
.footer-link {
    color: var(--muted);
    font-size: 0.875rem;
    transition: color 0.15s;
}
.footer-link:hover {
    color: var(--text);
}
.footer-copy {
    color: var(--muted);
    font-size: 0.8rem;
}
.doc-page {
    padding-top: 4rem;
    padding-bottom: 6rem;
}
.doc-page h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    color: var(--text);
    margin-bottom: 0.5rem;
}
.doc-page h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    margin-top: 2.5rem;
    margin-bottom: 0.75rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid var(--border);
}
.doc-page section {
    margin-top: 2.5rem;
}
.doc-page p {
    max-width: 72ch;
    line-height: 1.75;
}
.doc-page pre {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.25rem 1.5rem;
    margin: 1rem 0;
    overflow-x: auto;
}
.doc-page pre code {
    font-size: 0.85rem;
    line-height: 1.65;
    color: #c9d1d9;
}
.doc-page code {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.15em 0.4em;
    font-size: 0.875em;
}
.doc-page pre code {
    background: none;
    border: none;
    padding: 0;
}
.doc-page ul {
    padding-left: 1.5rem;
    color: var(--muted);
}
.doc-page li {
    margin-bottom: 0.4rem;
    line-height: 1.7;
}
.doc-page a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
}
.doc-page a:hover {
    color: var(--accent-h);
}
/* ── Sidebar doc layout ──────────────────────────────────────────── */
.doc-layout {
    max-width: var(--max-w);
    margin: 0 auto;
    display: flex;
    align-items: flex-start;
    min-height: calc(100vh - 56px);
}
.sidebar {
    width: 252px;
    flex-shrink: 0;
    position: sticky;
    top: 56px;
    height: calc(100vh - 56px);
    overflow-y: auto;
    border-right: 1px solid var(--border);
    padding: 1.5rem 0 3rem;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}
.sidebar-label {
    display: block;
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--muted);
    padding: 1.25rem 1.25rem 0.35rem;
    opacity: 0.7;
}
.sidebar-sep {
    height: 1px;
    background: var(--border);
    margin: 0.75rem 1.25rem;
}
.sidebar-links {
    display: flex;
    flex-direction: column;
}
.sidebar-link {
    display: block;
    padding: 0.3rem 1.25rem;
    font-size: 0.82rem;
    color: var(--muted);
    transition: color 0.12s, background 0.12s;
    line-height: 1.5;
    text-decoration: none;
}
.sidebar-link:hover {
    color: var(--text);
    background: rgba(255,255,255,0.03);
}
.sidebar-link.active {
    color: var(--accent);
    background: rgba(124,92,252,0.08);
    border-right: 2px solid var(--accent);
}
.sidebar-link-sub {
    padding-left: 2.25rem;
    font-size: 0.78rem;
}
.doc-content {
    flex: 1;
    min-width: 0;
    padding: 3rem 2.5rem 6rem;
    max-width: 820px;
}
.doc-content h1 {
    font-size: clamp(1.75rem, 3.5vw, 2.6rem);
    font-weight: 800;
    color: var(--text);
    margin-bottom: 0.75rem;
    letter-spacing: -0.03em;
    line-height: 1.15;
}
.doc-content h2 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text);
    margin-top: 3rem;
    margin-bottom: 0.65rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid var(--border);
}
.doc-content h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin-top: 1.75rem;
    margin-bottom: 0.4rem;
}
.doc-content h4 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--muted);
    margin-top: 1.25rem;
    margin-bottom: 0.3rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.doc-content p {
    max-width: 72ch;
    line-height: 1.8;
    color: var(--muted);
}
.doc-content pre {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.25rem 1.5rem;
    margin: 1rem 0 1.5rem;
    overflow-x: auto;
}
.doc-content pre code {
    font-size: 0.845rem;
    line-height: 1.7;
    color: #c9d1d9;
    background: none;
    border: none;
    padding: 0;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
}
.doc-content code {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.15em 0.45em;
    font-size: 0.875em;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
}
.doc-content ul,
.doc-content ol {
    padding-left: 1.5rem;
    color: var(--muted);
    margin-bottom: 1rem;
}
.doc-content li {
    margin-bottom: 0.45rem;
    line-height: 1.75;
}
.doc-content a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
}
.doc-content a:hover { color: var(--accent-h); }
.doc-content section { margin-top: 0; }
@media (max-width: 860px) {
    .doc-layout { flex-direction: column; }
    .sidebar {
        width: 100%;
        position: static;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding: 1rem 0;
    }
    .doc-content { padding: 2rem 1.25rem 4rem; }
    .nav-links { gap: 1rem; }
}