:root {
    --bg-0: #0c0e10;
    --bg-1: #15181c;
    --bg-2: #1d2125;
    --bg-3: #262b30;
    --line: rgba(255, 255, 255, 0.08);
    --text: #e7eaee;
    --text-dim: #95a0aa;
    --text-mute: #6a747d;
    --accent: #f5b041;
    --accent-2: #44d4b9;
    --accent-strong: #ffc864;
    --warn: #ff7a59;
    --code-bg: #11141a;
    --code-text: #e7eaee;
    --shadow-1: 0 4px 16px rgba(0, 0, 0, 0.4);
    --radius: 6px;
    --transition: 0.18s ease;
    --max-width: 1180px;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
    background: var(--bg-0);
    color: var(--text);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}


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

main { padding-top: 72px; }


.nav {
    position: fixed; top: 0; left: 0; right: 0; height: 76px; z-index: 100;
    background: rgba(12, 14, 16, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
}
.nav-inner {
    max-width: var(--max-width); margin: 0 auto; height: 100%;
    padding: 0 24px; display: flex; align-items: center; justify-content: space-between;
}
.nav-brand {
    display: flex; flex-direction: column; line-height: 1.15;
    text-decoration: none;
}
.nav-brand .brand-name {
    font-weight: 800; font-size: 22px; letter-spacing: -0.005em;
    color: var(--text);
}
.nav-brand .brand-name .accent { color: var(--accent); }
.nav-brand .brand-sub {
    font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase;
    color: var(--text-mute); margin-top: 4px; font-weight: 600;
}
.nav-links { display: flex; gap: 28px; list-style: none; }
.nav-links a {
    color: var(--text-dim); text-decoration: none; font-size: 14px;
    transition: color var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); }


.hero {
    padding: 96px 0 80px;
    text-align: center;
    background:
      radial-gradient(ellipse at 50% 0%, rgba(245, 176, 65, 0.08), transparent 60%),
      var(--bg-0);
    border-bottom: 1px solid var(--line);
}
.hero h1 {
    font-size: 56px; line-height: 1.05; font-weight: 800; margin-bottom: 16px;
    letter-spacing: -0.02em;
}
.hero h1 .accent { color: var(--accent); }
.hero .tagline {
    color: var(--text-dim); font-size: 19px; max-width: 720px; margin: 0 auto 32px;
}
.hero .cta-row { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.hero .kicker {
    display: inline-block;
    color: var(--accent); font-weight: 700; font-size: 14px;
    letter-spacing: 0.18em; text-transform: uppercase;
    margin-bottom: 20px;
    padding: 8px 16px; border-radius: 999px;
    background: rgba(245, 176, 65, 0.08);
    border: 1px solid rgba(245, 176, 65, 0.25);
}
.hero .value-row {
    display: flex; justify-content: center; gap: 32px; flex-wrap: wrap;
    margin: 0 auto 36px; max-width: 880px;
}
.hero .value-row .v {
    display: inline-flex; align-items: center; gap: 8px;
    color: var(--text-dim); font-size: 14px;
}
.hero .value-row .v::before {
    content: ""; display: inline-block; width: 6px; height: 6px;
    border-radius: 50%; background: var(--accent);
}
.hero .compat-strip {
    margin: 36px auto 0; color: var(--text-mute); font-size: 13px;
    letter-spacing: 0.04em;
}
.hero .compat-strip strong {
    color: var(--text); font-weight: 700; margin: 0 4px;
}
.hero .compat-strip .sep { color: var(--accent); margin: 0 6px; }
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 22px; border-radius: var(--radius);
    font-weight: 600; font-size: 14px; letter-spacing: 0.02em;
    text-decoration: none; cursor: pointer; border: 1px solid transparent;
    transition: transform var(--transition), background var(--transition);
}
.btn-primary { background: var(--accent); color: #1a1107; }
.btn-primary:hover { background: var(--accent-strong); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.btn-disabled {
    background: transparent;
    color: var(--text-dim);
    border: 1px solid var(--line);
    cursor: not-allowed;
}
.btn-disabled:hover { background: transparent; transform: none; color: var(--text-dim); }

.btn-wide {
    min-width: 280px;
    padding: 14px 48px;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 0.04em;
    justify-content: center;
}

.btn .badge {
    display: inline-block;
    padding: 2px 8px;
    margin-left: 4px;
    font-size: 10px; font-weight: 700;
    letter-spacing: 0.08em; text-transform: uppercase;
    background: var(--bg-2); color: var(--accent);
    border: 1px solid var(--line); border-radius: 999px;
}

.hero-image {
    margin-top: 56px; max-width: 1240px; padding: 0 24px;
    margin-left: auto; margin-right: auto;
}
.hero-image img {
    width: 100%; aspect-ratio: 16 / 9; object-fit: cover;
    border-radius: 8px; border: 1px solid var(--line);
    box-shadow: var(--shadow-1);
}
.hero-image .placeholder {
    aspect-ratio: 16 / 9; background:
      linear-gradient(135deg, var(--bg-2) 0%, var(--bg-1) 100%);
    border: 1px dashed var(--line); border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    color: var(--text-mute); font-size: 14px;
}

.video-frame {
    max-width: 1100px; margin: 0 auto;
    aspect-ratio: 16 / 9; position: relative;
    border-radius: var(--radius); border: 1px solid var(--line);
    overflow: hidden; background: var(--bg-1);
    box-shadow: var(--shadow-1);
}
.video-frame iframe, .video-frame video {
    position: absolute; inset: 0; width: 100%; height: 100%;
    display: block; border: none;
}
.footer-note { display: block; margin-top: 6px; font-size: 12px; color: var(--text-mute); }
.video-note {
    max-width: 1100px; margin: 12px auto 0; text-align: center;
    font-size: 12px; color: var(--text-mute);
}
.video-placeholder {
    position: absolute; inset: 0;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center; gap: 14px;
    color: var(--text-dim); padding: 24px; text-align: center;
    background:
      radial-gradient(ellipse at center, rgba(245, 176, 65, 0.08), transparent 60%),
      linear-gradient(135deg, var(--bg-2) 0%, var(--bg-1) 100%);
}
.video-placeholder .play-icon {
    width: 88px; height: 88px; border-radius: 50%;
    background: var(--accent); color: #1a1107;
    display: flex; align-items: center; justify-content: center;
    font-size: 36px; padding-left: 6px;
    box-shadow: 0 4px 24px rgba(245, 176, 65, 0.35);
    transition: transform var(--transition);
}
.video-placeholder:hover .play-icon { transform: scale(1.05); }
.video-placeholder p          { font-size: 15px; font-weight: 600; color: var(--text); }
.video-placeholder p.note     { font-size: 12px; color: var(--text-mute); font-weight: normal; max-width: 480px; }
.video-placeholder p.note code { background: var(--bg-2); padding: 1px 6px; border-radius: 3px; font-size: 11px; color: var(--accent-strong); }

.showcase-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 20px;
}
.showcase-card {
    display: block; position: relative; overflow: hidden;
    border-radius: var(--radius); border: 1px solid var(--line);
    transition: transform var(--transition), border-color var(--transition);
    text-decoration: none;
}
.showcase-card:hover {
    transform: translateY(-3px); border-color: var(--accent);
}
.showcase-card img {
    width: 100%; aspect-ratio: 16 / 9; object-fit: cover;
    display: block; transition: transform 0.4s ease;
}
.showcase-card:hover img { transform: scale(1.03); }
.showcase-card .label {
    position: absolute; bottom: 14px; left: 16px;
    padding: 6px 14px; background: rgba(12, 14, 16, 0.85);
    backdrop-filter: blur(6px);
    border-radius: var(--radius); border: 1px solid var(--line);
    color: var(--text); font-size: 14px; font-weight: 600;
}
.see-more-link {
    text-align: center; margin-top: 32px;
}
.see-more-link a {
    color: var(--accent-2); text-decoration: none; font-weight: 600;
    font-size: 15px;
}
.see-more-link a:hover { color: var(--accent); }

.showcase-card.no-link {
    cursor: default;
    margin: 0;
}
.showcase-card.no-link:hover {
    transform: none; border-color: var(--line);
}
.showcase-card.no-link:hover img { transform: none; }

.feature-gallery {
    display: grid; grid-template-columns: 1fr; gap: 32px;
    max-width: 1240px; margin: 0 auto;
}
.feature-tile {
    margin: 0; border-radius: var(--radius);
    border: 1px solid var(--line); overflow: hidden;
    background: var(--bg-1);
    box-shadow: var(--shadow-1);
}
.feature-tile img {
    width: 100%; aspect-ratio: 16 / 9; object-fit: cover;
    display: block;
}

.feature-row {
    border-bottom: 1px solid var(--line);
    padding-bottom: 64px;
}
.feature-row:last-of-type { border-bottom: none; }
.feature-row-title {
    font-size: 28px; font-weight: 700; color: var(--text);
    margin-bottom: 12px; letter-spacing: -0.01em;
}
.feature-row-lede {
    font-size: 16px; color: var(--text-dim);
    line-height: 1.6; max-width: 880px; margin-bottom: 20px;
}
.feature-row-img {
    width: 100%; aspect-ratio: 16 / 9; object-fit: cover;
    display: block; border-radius: var(--radius);
    border: 1px solid var(--line);
    box-shadow: var(--shadow-1); margin-bottom: 16px;
}
.feature-row-placeholder {
    aspect-ratio: 16 / 9;
    border-radius: var(--radius);
    border: 1px dashed var(--line);
    background: linear-gradient(135deg, var(--bg-2) 0%, var(--bg-1) 100%);
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    color: var(--text-mute); font-size: 14px; text-align: center;
    margin-bottom: 16px;
    padding: 24px;
}
.feature-row-placeholder small { font-size: 12px; margin-top: 8px; line-height: 1.5; }
.feature-row-placeholder code { font-size: 11px; }
.feature-row-meta {
    font-size: 13px; color: var(--text-mute);
    line-height: 1.7;
}
.feature-row-meta code {
    font-size: 12px; padding: 1px 6px;
}
.badge-inline {
    display: inline-block;
    padding: 2px 10px;
    margin-left: 8px;
    font-size: 11px; font-weight: 700;
    letter-spacing: 0.08em; text-transform: uppercase;
    background: var(--accent); color: #1a1107;
    border-radius: 999px;
    vertical-align: middle;
}


section.feature, section.content { padding: 80px 0; border-bottom: 1px solid var(--line); }

.section-head { text-align: center; margin-bottom: 56px; }
.section-head .eyebrow {
    color: var(--accent-2); font-size: 13px; font-weight: 600;
    letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 12px;
}
.section-head h2 {
    font-size: 36px; line-height: 1.2; letter-spacing: -0.01em;
}


.feature-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}
.feature-card {
    background: var(--bg-1); padding: 28px; border-radius: var(--radius);
    border: 1px solid var(--line);
    transition: border-color var(--transition), transform var(--transition);
}
.feature-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.feature-card .icon {
    width: 36px; height: 36px; margin-bottom: 16px;
    display: inline-flex; align-items: center; justify-content: center;
    background: rgba(245, 176, 65, 0.1); color: var(--accent);
    border-radius: var(--radius); font-size: 18px; font-weight: 700;
}
.feature-card h3 { font-size: 17px; margin-bottom: 8px; }
.feature-card p { color: var(--text-dim); font-size: 14px; }


.preset-row { display: flex; gap: 12px; overflow-x: auto; padding: 8px 0 16px; }
.preset-chip {
    flex: 0 0 auto; padding: 10px 18px; border-radius: 999px;
    background: var(--bg-2); border: 1px solid var(--line);
    color: var(--text-dim); cursor: pointer; font-size: 13px;
    transition: all var(--transition);
}
.preset-chip:hover, .preset-chip.active {
    background: var(--accent); color: #1a1107; border-color: var(--accent);
}


pre {
    background: var(--code-bg); padding: 20px 24px; border-radius: var(--radius);
    border: 1px solid var(--line); overflow-x: auto;
    font-family: "SF Mono", Menlo, Consolas, monospace; font-size: 13px;
    line-height: 1.55; margin: 16px 0; color: var(--code-text);
}
code {
    font-family: "SF Mono", Menlo, Consolas, monospace;
    background: var(--bg-2); padding: 2px 6px; border-radius: 4px;
    font-size: 0.92em; color: var(--accent-strong);
}
pre code { background: transparent; padding: 0; color: inherit; font-size: inherit; }


table {
    width: 100%; border-collapse: collapse; margin: 16px 0;
    font-size: 14px; background: var(--bg-1); border-radius: var(--radius); overflow: hidden;
}
th, td {
    padding: 11px 16px; text-align: left;
    border-bottom: 1px solid var(--line); vertical-align: top;
}
th {
    background: var(--bg-2); color: var(--text);
    font-weight: 600; font-size: 13px; letter-spacing: 0.02em;
}
tbody tr:hover { background: var(--bg-2); }
td code { font-size: 12.5px; }


.docs-layout { display: grid; grid-template-columns: 240px 1fr; gap: 48px; padding: 48px 0; }
.docs-side {
    position: sticky; top: 80px; align-self: start; max-height: calc(100vh - 96px);
    overflow-y: auto;
}
.docs-side h4 {
    font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase;
    color: var(--text-mute); margin: 24px 0 8px;
}
.docs-side ul { list-style: none; }
.docs-side a {
    display: block; padding: 5px 12px; color: var(--text-dim);
    text-decoration: none; font-size: 14px;
    border-left: 2px solid transparent; transition: all var(--transition);
}
.docs-side a:hover { color: var(--text); border-left-color: var(--accent); }
.docs-side a.active { color: var(--accent); border-left-color: var(--accent); }

.docs-content section { padding: 32px 0; border-bottom: 1px solid var(--line); }
.docs-content section:last-child { border-bottom: none; }
.docs-content h2 { font-size: 28px; margin-bottom: 16px; }
.docs-content h3 { font-size: 20px; margin: 24px 0 10px; color: var(--accent-strong); }
.docs-content p { margin-bottom: 12px; color: var(--text); }
.docs-content ul, .docs-content ol { margin: 12px 0 16px 24px; }
.docs-content li { margin-bottom: 6px; color: var(--text); }


.callout {
    padding: 16px 20px; border-radius: var(--radius); margin: 20px 0;
    border-left: 3px solid var(--accent-2);
    background: rgba(68, 212, 185, 0.06); color: var(--text);
}
.callout.warn { border-left-color: var(--warn); background: rgba(255, 122, 89, 0.06); }
.callout.tip  { border-left-color: var(--accent); background: rgba(245, 176, 65, 0.06); }
.callout strong { color: var(--accent-strong); }


.tutorial { padding: 32px 0; border-bottom: 1px solid var(--line); }
.tutorial:last-child { border-bottom: none; }
.tutorial h2 { font-size: 26px; margin-bottom: 8px; }
.tutorial .summary { color: var(--text-dim); margin-bottom: 24px; }
.tutorial-step {
    display: flex; gap: 20px; padding: 20px;
    background: var(--bg-1); border-radius: var(--radius); margin-bottom: 16px;
    border: 1px solid var(--line);
}
.tutorial-step .num {
    flex: 0 0 32px; height: 32px; border-radius: 50%;
    background: var(--accent); color: #1a1107;
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 15px;
}
.tutorial-step .body { flex: 1; }
.tutorial-step .body strong { display: block; margin-bottom: 6px; color: var(--text); }
.tutorial-step .body p { font-size: 14px; color: var(--text-dim); margin-bottom: 8px; }


.gallery-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 24px;
}
.gallery-item {
    background: var(--bg-1); border-radius: var(--radius); overflow: hidden;
    border: 1px solid var(--line);
}
.gallery-item .image {
    aspect-ratio: 16 / 10; background:
      linear-gradient(135deg, var(--bg-2) 0%, var(--bg-1) 100%);
    border-bottom: 1px dashed var(--line);
    display: flex; align-items: center; justify-content: center;
    color: var(--text-mute); font-size: 13px; padding: 24px;
}
.gallery-item .meta { padding: 16px 20px; }
.gallery-item h3 { font-size: 15px; margin-bottom: 4px; }
.gallery-item p { font-size: 13px; color: var(--text-dim); }

.compare {
    position: relative; aspect-ratio: 16 / 9; border-radius: var(--radius);
    border: 1px solid var(--line); overflow: hidden; margin: 24px 0;
    background: linear-gradient(90deg, var(--bg-2) 0%, var(--bg-2) 50%, var(--bg-3) 50%, var(--bg-3) 100%);
    display: flex; align-items: center; justify-content: center;
    color: var(--text-mute); font-size: 14px;
}
.compare::before {
    content: "PBR  ▶◀  Celshading"; padding: 8px 18px;
    background: rgba(0,0,0,0.6); border-radius: var(--radius);
    border: 1px solid var(--line);
}


footer {
    padding: 40px 0; text-align: center; color: var(--text-mute); font-size: 13px;
    border-top: 1px solid var(--line);
}
footer a { color: var(--accent-2); text-decoration: none; }


@media (max-width: 900px) {
    .hero h1 { font-size: 40px; }
    .docs-layout { grid-template-columns: 1fr; gap: 24px; }
    .docs-side { position: static; max-height: none; }
    .nav-links { gap: 18px; font-size: 13px; }
}