:root {
  --bg: #0e1614;
  --bg-soft: #14221e;
  --bg-card: #172823;
  --ink: #e8f0ec;
  --ink-dim: #a8b8b0;
  --accent: #d9a23d;
  --accent-2: #3bbf9e;
  --line: #27403a;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

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

.container { max-width: 1180px; margin: 0 auto; padding: 0 1rem; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(14,22,20,.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 68px; gap: 1rem;
}
.brand { display: flex; align-items: center; gap: .6rem; }
.brand img { width: 38px; height: 38px; }
.brand-name { font-weight: 700; font-size: 1.05rem; color: var(--ink); letter-spacing: .5px; }
.brand-name span { color: var(--accent); }

.main-nav ul { display: flex; gap: 1.4rem; list-style: none; }
.main-nav a { color: var(--ink-dim); font-size: .95rem; font-weight: 500; padding: .3rem 0; }
.main-nav a:hover, .main-nav a.is-active { color: var(--accent); text-decoration: none; }

.nav-toggle {
  display: none; background: none; border: 1px solid var(--line);
  color: var(--ink); font-size: 1.3rem; padding: .2rem .7rem; border-radius: 8px; cursor: pointer;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 2.5rem 0 2rem;
  margin-top: 3.5rem;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 2rem; }
.footer-grid h3 { font-size: .95rem; margin-bottom: .8rem; color: var(--ink); }
.footer-grid ul { list-style: none; }
.footer-grid li { margin-bottom: .45rem; }
.footer-grid a { color: var(--ink-dim); font-size: .9rem; }
.footer-copy { margin-top: 2rem; padding-top: 1.2rem; border-top: 1px solid var(--line); color: var(--ink-dim); font-size: .82rem; display: flex; flex-wrap: wrap; gap: 1rem; }

/* ---------- Hero ---------- */
.hero {
  padding: 3.5rem 0 2.5rem;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(60% 70% at 78% 20%, rgba(59,191,158,.18), transparent 60%),
    linear-gradient(180deg, var(--bg-soft), var(--bg));
}
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 2.5rem; align-items: center; }
.hero h1 { font-size: clamp(1.8rem, 4vw, 2.7rem); line-height: 1.2; margin-bottom: 1rem; }
.hero h1 span { color: var(--accent); }
.hero p { color: var(--ink-dim); max-width: 40rem; margin-bottom: 1.5rem; }
.hero-cta { display: flex; gap: 1rem; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: .75rem 1.4rem; border-radius: 999px;
  font-weight: 600; font-size: .95rem; border: 1px solid transparent;
}
.btn-primary { background: var(--accent); color: #241a08; }
.btn-primary:hover { filter: brightness(1.05); text-decoration: none; }
.btn-ghost { border-color: var(--accent-2); color: var(--accent-2); }
.btn-ghost:hover { background: rgba(59,191,158,.12); text-decoration: none; }

/* ---------- Sections ---------- */
.section { padding: 2.8rem 0; }
.section-head { margin-bottom: 1.6rem; }
.section-head h2 { font-size: 1.7rem; margin-bottom: .4rem; }
.section-head p { color: var(--ink-dim); max-width: 46rem; }

/* Stat strip */
.stat-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.stat { background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.2rem; }
.stat b { display: block; font-size: 1.6rem; color: var(--accent); margin-bottom: .2rem; }
.stat span { color: var(--ink-dim); font-size: .88rem; }

/* Article card grid (staggered) */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 1.5rem; }
.card {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden; transition: transform .18s ease;
}
.card:hover { transform: translateY(-4px); }
.card img { width: 100%; height: 190px; object-fit: cover; }
.card-body { padding: 1.2rem; }
.card-body h3 { font-size: 1.12rem; margin-bottom: .5rem; }
.card-body p { color: var(--ink-dim); font-size: .9rem; margin-bottom: .8rem; }
.card-meta { color: var(--ink-dim); font-size: .82rem; display: flex; gap: 1rem; }

/* Split intro rows (article home) */
.split-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; align-items: center; margin-bottom: 1.4rem; }
.split-row img { border-radius: var(--radius); }
.split-row h3 { font-size: 1.25rem; margin-bottom: .5rem; }
.split-row p { color: var(--ink-dim); }

/* Category tiles */
.cat-tiles { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.cat-tile { background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.4rem; }
.cat-tile h3 { margin-bottom: .5rem; }
.cat-tile p { color: var(--ink-dim); font-size: .92rem; margin-bottom: 1rem; }
.cat-tile .cat-link { color: var(--accent); font-weight: 600; }

/* FAQ / list */
.faq-item { border-bottom: 1px solid var(--line); padding: 1rem 0; }
.faq-item h3 { font-size: 1.02rem; margin-bottom: .4rem; }
.faq-item p { color: var(--ink-dim); }

/* CTA */
.cta-band {
  background: linear-gradient(120deg, var(--bg-soft), #1a2b25);
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 2.2rem; display: flex; align-items: center; justify-content: space-between; gap: 2rem; flex-wrap: wrap;
}
.cta-band h2 { font-size: 1.4rem; margin-bottom: .4rem; }

/* ---------- Article page ---------- */
.article-layout { display: grid; grid-template-columns: 1fr 320px; gap: 2.2rem; }
.breadcrumb { font-size: .85rem; color: var(--ink-dim); margin-bottom: 1.2rem; }
.breadcrumb a { color: var(--accent-2); }
.article-head h1 { font-size: clamp(1.6rem, 3vw, 2.2rem); line-height: 1.25; margin-bottom: .8rem; }
.article-meta { color: var(--ink-dim); font-size: .9rem; margin-bottom: 1.4rem; display: flex; gap: 1.2rem; flex-wrap: wrap; }
.article-body p { margin-bottom: 1.1rem; }
.article-body h2 { font-size: 1.3rem; margin: 1.8rem 0 .8rem; padding-top: .4rem; border-top: 1px solid var(--line); }
.article-body h3 { font-size: 1.08rem; margin: 1.3rem 0 .5rem; }
.article-body ul, .article-body ol { margin: 0 0 1.2rem 1.3rem; }
.article-body li { margin-bottom: .45rem; }
.article-body figure { margin: 1.4rem 0; }
.article-body figcaption { color: var(--ink-dim); font-size: .82rem; margin-top: .4rem; }
.article-body blockquote {
  border-left: 3px solid var(--accent); background: var(--bg-soft);
  padding: .9rem 1.2rem; margin: 1.3rem 0; color: var(--ink-dim); border-radius: 0 8px 8px 0;
}
.article-hero-img { border-radius: var(--radius); margin-bottom: 1.4rem; }
.inline-figure { float: right; width: 42%; margin: .4rem 0 1rem 1.2rem; border-radius: var(--radius); }
.split-figure { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 1.4rem 0; }
.split-figure img { border-radius: var(--radius); }

/* Related sidebar */
.article-aside { background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.4rem; }
.article-aside h2 { font-size: 1.05rem; margin-bottom: 1rem; color: var(--accent); }
.related-list { list-style: none; }
.related-list li { margin-bottom: .9rem; padding-bottom: .9rem; border-bottom: 1px dashed var(--line); }
.related-list li:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.related-list a { color: var(--ink); font-size: .92rem; font-weight: 500; display: block; line-height: 1.4; }
.related-list a:hover { color: var(--accent); text-decoration: none; }
.related-list .rel-cat { display: block; color: var(--accent-2); font-size: .78rem; margin-top: .2rem; }

/* Back to category */
.article-back { margin-top: 2.4rem; padding-top: 1.2rem; border-top: 1px solid var(--line); font-size: .9rem; }

/* ---------- Category page ---------- */
.cat-hero { padding: 2.4rem 0 1rem; }
.cat-hero h1 { font-size: 2rem; margin-bottom: .6rem; }
.cat-hero p { color: var(--ink-dim); max-width: 48rem; }
.article-list { list-style: none; margin-top: 1.6rem; }
.article-list li {
  display: flex; gap: 1.2rem; padding: 1.2rem 0; border-bottom: 1px solid var(--line);
}
.article-list img { width: 220px; height: 130px; object-fit: cover; border-radius: var(--radius); }
.article-list h2 { font-size: 1.2rem; margin-bottom: .4rem; }
.article-list h2 a { color: var(--ink); }
.article-list h2 a:hover { color: var(--accent); text-decoration: none; }
.article-list p { color: var(--ink-dim); font-size: .92rem; }
.article-list .list-meta { color: var(--ink-dim); font-size: .82rem; margin-bottom: .4rem; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .article-aside { order: 2; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stat-strip { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  body { font-size: 15px; }
  .main-nav {
    display: none; position: absolute; top: 68px; left: 0; right: 0;
    background: var(--bg-soft); border-bottom: 1px solid var(--line); padding: 1rem;
  }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; gap: .6rem; }
  .nav-toggle { display: block; }
  .split-row { grid-template-columns: 1fr; }
  .cat-tiles { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: 1fr; }
  .stat-strip { grid-template-columns: 1fr 1fr; }
  .inline-figure { float: none; width: 100%; margin: 0 0 1rem; }
  .split-figure { grid-template-columns: 1fr; }
  .article-list li { flex-direction: column; }
  .article-list img { width: 100%; height: auto; }
  .cta-band { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  html { scroll-behavior: auto; }
}