:root {
  --bg: #ffffff;
  --bg-elevated: #f8f9fa;
  --bg-soft: #fff7ed;
  --bg-card: #ffffff;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --text: #111827;
  --text-muted: #6b7280;
  --text-soft: #9ca3af;
  --accent: #f59e0b;
  --accent-hover: #d97706;
  --accent-glow: rgba(245, 158, 11, 0.16);
  --success: #059669;
  --shadow: 0 24px 70px rgba(17, 24, 39, 0.08);
  --radius: 16px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent-hover); }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; background: var(--bg-elevated); border: 1px solid var(--border); padding: 0.1rem 0.3rem; border-radius: 6px; }
.site-nav { position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,0.95); backdrop-filter: blur(20px); border-bottom: 1px solid var(--border); }
.nav-inner { width: min(1200px, calc(100% - 2rem)); margin: 0 auto; min-height: 72px; display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.logo { display: inline-flex; align-items: center; gap: 0.6rem; font-weight: 800; font-size: 1.08rem; }
.logo-mark { width: 36px; height: 36px; border-radius: 10px; background: var(--accent); color: #111827; display: grid; place-items: center; font-weight: 900; box-shadow: 0 8px 28px var(--accent-glow); }
.logo em { color: var(--accent-hover); font-style: normal; }
.nav-links { display: flex; align-items: center; gap: 1.4rem; font-size: 0.92rem; font-weight: 500; color: var(--text-muted); }
.nav-cta { color: #111827 !important; background: var(--accent); border-radius: 8px; padding: 0.55rem 1rem; font-weight: 700; }
.container { width: min(1200px, calc(100% - 2rem)); margin: 0 auto; }
.hero { display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(320px, 0.98fr); align-items: start; gap: clamp(2rem, 6vw, 5rem); padding: clamp(4.5rem, 9vw, 8rem) 0 clamp(3rem, 6vw, 5rem); }
.badge { display: inline-flex; align-items: center; gap: 0.45rem; background: var(--bg-elevated); border: 1px solid var(--border); border-radius: 999px; color: var(--accent-hover); font-weight: 700; font-size: 0.8rem; padding: 0.38rem 0.85rem; }
h1, h2, h3 { letter-spacing: -0.04em; line-height: 1.12; }
h1 { margin: 1.2rem 0 1.1rem; font-size: clamp(2.5rem, 6vw, 4.8rem); font-weight: 800; }
h1 .highlight, h2 .highlight { color: var(--accent-hover); }
.lead { color: var(--text-muted); font-size: clamp(1.02rem, 2vw, 1.16rem); max-width: 720px; }
.actions { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-top: 1.8rem; }
.btn { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.85rem 1.25rem; border-radius: 8px; font-weight: 700; border: 1px solid var(--border); transition: transform 0.18s ease, background 0.18s ease; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--accent); color: #111827; border-color: var(--accent); box-shadow: 0 12px 36px var(--accent-glow); }
.btn-secondary { background: var(--bg-elevated); color: var(--text); }
.search-panel, .card, .topic-card, .doc-card, .illustration, .quick-nav { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.search-panel { padding: 1.4rem; }
.search-title { font-size: 0.78rem; font-weight: 800; letter-spacing: 0.1em; color: var(--text-muted); text-transform: uppercase; margin-bottom: 0.85rem; }
.search-box { display: flex; gap: 0.65rem; align-items: center; border: 1px solid var(--border); background: var(--bg-elevated); border-radius: 12px; padding: 0.75rem 0.9rem; }
.search-box input { width: 100%; border: 0; outline: 0; background: transparent; font: inherit; color: var(--text); }
.suggestions { display: grid; gap: 0.65rem; margin-top: 1rem; max-height: clamp(16rem, 42vh, 28rem); overflow-y: auto; padding-right: 0.25rem; overscroll-behavior: contain; }
.suggestion { display: flex; justify-content: space-between; gap: 1rem; align-items: center; padding: 0.8rem; border: 1px solid var(--border); border-radius: 10px; background: var(--bg-elevated); }
.suggestion strong { display: block; }
.suggestion span { color: var(--text-muted); font-size: 0.84rem; }
.section { padding: 4rem 0; border-top: 1px solid var(--border); }
.section-head { max-width: 780px; margin-bottom: 1.7rem; }
.section-head h2 { margin: 0 0 0.8rem; font-size: clamp(2rem, 4vw, 3.2rem); }
.section-head p { color: var(--text-muted); margin: 0; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.card { padding: 1.25rem; box-shadow: none; }
.card h3, .topic-card h3 { margin: 0 0 0.35rem; font-size: 1.16rem; }
.card p, .topic-card p { margin: 0; color: var(--text-muted); }
.topic-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.topic-card { display: flex; flex-direction: column; min-height: 185px; padding: 1.1rem; box-shadow: none; }
.topic-card .meta { margin-top: auto; color: var(--text-soft); font-size: 0.82rem; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.hidden { display: none !important; }
.doc-hero { padding: 3rem 0 1.25rem; }
.breadcrumb { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 1.1rem; }
.doc-card { overflow: hidden; margin-bottom: 4rem; }
.article { max-width: 860px; padding: clamp(1.5rem, 4vw, 3.2rem); }
.article h1 { font-size: clamp(2.3rem, 5vw, 4.2rem); }
.article h2 { margin-top: 2.6rem; font-size: clamp(1.45rem, 3vw, 2.2rem); }
.article p, .article li { color: var(--text-muted); }
.illustration { margin: 2rem 0; padding: 0.85rem; box-shadow: none; background: var(--bg-elevated); }
.illustration img { width: auto; max-width: 100%; height: auto; max-height: 620px; object-fit: contain; display: block; margin: 0 auto; border-radius: 10px; background: #fff; }
.illustration figcaption { color: var(--text-muted); font-size: 0.84rem; margin-top: 0.55rem; }
.steps { list-style: none; counter-reset: step; padding: 0; display: grid; gap: 0.8rem; }
.steps li { counter-increment: step; position: relative; padding: 1rem 1rem 1rem 3.1rem; border: 1px solid var(--border); border-radius: 12px; background: #fff; }
.steps li::before { content: counter(step); position: absolute; left: 1rem; top: 1rem; width: 1.45rem; height: 1.45rem; border-radius: 50%; background: var(--accent); color: #111827; display: grid; place-items: center; font-size: 0.82rem; font-weight: 900; }
.callout { border-left: 4px solid var(--accent); background: #fffbeb; border-radius: 10px; padding: 1rem; color: #78350f; }
.related-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.8rem; }
.related-card { box-shadow: none; padding: 1rem; border: 1px solid var(--border); border-radius: 12px; }
.related-card strong { display:block; }
.related-card span { color: var(--text-muted); font-size: 0.85rem; }
.debug-source { display: inline-block; margin-top: 2rem; color: var(--text-soft); font-size: 0.72rem; opacity: 0.38; }
.debug-source:hover { opacity: 1; color: var(--accent-hover); }
.quick-nav { padding: 1rem; margin: 2rem 0; box-shadow: none; background: var(--bg-elevated); }
.quick-nav a { display: inline-flex; margin: 0.25rem 0.45rem 0.25rem 0; color: var(--text-muted); font-weight: 600; font-size: 0.9rem; }
.footer { border-top: 1px solid var(--border); padding: 2rem 0; color: var(--text-muted); font-size: 0.9rem; }
@media (max-width: 900px) { .hero { grid-template-columns: 1fr; } .cards, .topic-grid, .related-grid { grid-template-columns: 1fr; } .nav-links { display: none; } .article { max-width: none; } }

.filter-row { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: 1rem; max-height: 9rem; overflow: auto; padding-right: 0.2rem; }
.filter-chip { border: 1px solid var(--border); background: var(--bg-elevated); color: var(--text-muted); border-radius: 999px; padding: 0.35rem 0.7rem; font: inherit; font-size: 0.78rem; font-weight: 700; cursor: pointer; }
.filter-chip.active, .filter-chip:hover { background: var(--accent); border-color: var(--accent); color: #111827; }
/* Source/help images must never be enlarged beyond their intrinsic pixel dimensions. */
.illustration img { width: auto; max-width: 100%; height: auto; object-fit: contain; display: block; margin: 0 auto; border-radius: 10px; background: #fff; }

.suggestions::-webkit-scrollbar, .filter-row::-webkit-scrollbar { width: 8px; height: 8px; }
.suggestions::-webkit-scrollbar-thumb, .filter-row::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 999px; }