:root {
  --bg: #0d1117;
  --bg-soft: #161b22;
  --card: #1a2029;
  --card-hover: #202834;
  --border: #2b3442;
  --text: #e6edf3;
  --text-dim: #9aa7b4;
  --accent: #4ea1ff;
  --accent-soft: rgba(78, 161, 255, 0.12);
  --tier-a: #3fb950;
  --tier-b: #d29922;
  --tier-c: #8b949e;
  --deep: #bc8cff;
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 58px; }
.brand a { font-size: 1.15rem; font-weight: 700; color: var(--text); }
.brand .accent { color: var(--accent); }
.brand-sub { margin-left: 10px; font-size: 0.8rem; color: var(--text-dim); }
.nav a { margin-left: 22px; color: var(--text-dim); font-size: 0.95rem; }
.nav a.active, .nav a:hover { color: var(--text); text-decoration: none; }

/* ---------- hero ---------- */
.hero { padding: 56px 0 36px; background: radial-gradient(ellipse at top, var(--accent-soft), transparent 60%); }
.hero h1 { margin: 0 0 10px; font-size: 2.1rem; }
.hero .accent { color: var(--accent); }
.hero-slim { padding: 40px 0 24px; }
.hero-slim h1 { font-size: 1.7rem; }
.subtitle { margin: 0; color: var(--text-dim); }
.stats { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 10px 24px; font-size: 0.9rem; color: var(--text-dim); }
.stats b { color: var(--text); }

/* ---------- toolbar ---------- */
.toolbar { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; margin: 8px 0 20px; }
.tabs { display: flex; flex-wrap: wrap; gap: 6px; }
.tab {
  border: 1px solid var(--border); background: var(--bg-soft); color: var(--text-dim);
  padding: 6px 16px; border-radius: 999px; cursor: pointer; font-size: 0.9rem;
}
.tab:hover { color: var(--text); border-color: var(--accent); }
.tab.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.search {
  flex: 1; min-width: 220px; max-width: 340px;
  background: var(--bg-soft); border: 1px solid var(--border); color: var(--text);
  border-radius: 999px; padding: 8px 18px; font-size: 0.9rem; outline: none;
}
.search:focus { border-color: var(--accent); }

/* ---------- list & card ---------- */
.list { display: grid; gap: 14px; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px 20px; cursor: pointer; transition: background 0.15s, border-color 0.15s;
}
.card:hover { background: var(--card-hover); border-color: var(--border); }
.card.deep { border-color: rgba(188, 140, 255, 0.45); background: linear-gradient(180deg, rgba(188,140,255,0.07), var(--card)); }
.card-meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font-size: 0.8rem; color: var(--text-dim); margin-bottom: 8px; }
.badge { display: inline-block; padding: 1px 10px; border-radius: 999px; font-size: 0.75rem; font-weight: 600; }
.badge.policy { background: rgba(78,161,255,0.15); color: var(--accent); }
.badge.case { background: rgba(255,123,114,0.15); color: #ff7b72; }
.badge.risk { background: rgba(210,153,34,0.15); color: var(--tier-b); }
.badge.industry { background: rgba(63,185,80,0.15); color: var(--tier-a); }
.badge.deep { background: rgba(188,140,255,0.15); color: var(--deep); }
.tier { font-weight: 700; padding: 1px 8px; border-radius: 6px; }
.tier.A { color: var(--tier-a); background: rgba(63,185,80,0.12); }
.tier.B { color: var(--tier-b); background: rgba(210,153,34,0.12); }
.tier.C { color: var(--tier-c); background: rgba(139,148,158,0.15); }
.card h2 { margin: 0 0 8px; font-size: 1.12rem; line-height: 1.5; font-weight: 600; }
.card .summary { margin: 0; color: var(--text-dim); font-size: 0.92rem; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card .tags { margin-top: 10px; display: flex; gap: 8px; flex-wrap: wrap; }
.tag { font-size: 0.75rem; color: var(--text-dim); background: var(--bg-soft); padding: 1px 10px; border-radius: 999px; }
.empty { text-align: center; color: var(--text-dim); padding: 60px 0; }

/* ---------- detail ---------- */
.detail { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px 32px; }
.back { display: inline-block; margin-bottom: 18px; color: var(--text-dim); font-size: 0.9rem; }
.back:hover { color: var(--accent); }
.detail h1 { font-size: 1.45rem; line-height: 1.55; margin: 6px 0 14px; }
.detail .body { margin-top: 18px; }
.detail .body p { color: #cdd6e0; }
.detail .body h3 { margin: 26px 0 10px; font-size: 1.08rem; color: var(--text); border-left: 3px solid var(--accent); padding-left: 12px; }
.source-line { margin-top: 22px; padding-top: 16px; border-top: 1px dashed var(--border); font-size: 0.85rem; color: var(--text-dim); }

/* ---------- regulation entries ---------- */
.reg-item { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; }
.reg-item h2 { margin: 0 0 6px; font-size: 1.05rem; }
.reg-item .reg-meta { font-size: 0.8rem; color: var(--text-dim); margin-bottom: 8px; display: flex; flex-wrap: wrap; gap: 6px 18px; }
.reg-item p { margin: 0; color: var(--text-dim); font-size: 0.92rem; }

footer { border-top: 1px solid var(--border); margin-top: 48px; padding: 26px 20px; text-align: center; color: var(--text-dim); font-size: 0.8rem; }

@media (max-width: 640px) {
  .hero h1 { font-size: 1.6rem; }
  .toolbar { flex-direction: column; align-items: stretch; }
  .search { max-width: none; }
  .detail { padding: 20px; }
}