/* ══════════════════════════════════════════════════════════════
   一的法则 · The Law of One — 全站设计系统
   深空 · 金辉 · 合一
   ══════════════════════════════════════════════════════════════ */

:root {
  /* 色彩 */
  --bg: #070b16;
  --bg-soft: #0c1224;
  --bg-card: rgba(20, 28, 52, 0.62);
  --bg-card-hover: rgba(28, 38, 68, 0.82);
  --line: rgba(140, 160, 220, 0.14);
  --line-strong: rgba(160, 180, 235, 0.28);
  --ink: #dfe6f5;
  --ink-dim: #98a4c4;
  --ink-faint: #6b7694;
  --gold: #e8c574;
  --gold-deep: #c9a44c;
  --violet: #a78bfa;
  --cyan: #7dd3fc;
  --rose: #f0a6b8;

  /* 字体 */
  --serif: "Songti SC", "STSong", "Noto Serif SC", "SimSun", Georgia, serif;
  --sans: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  /* 尺寸 */
  --maxw: 1080px;
  --radius: 14px;
  --shadow: 0 8px 40px rgba(0, 0, 0, 0.45);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* 星空背景层 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse 60% 40% at 20% 0%, rgba(88, 68, 160, 0.22), transparent 60%),
    radial-gradient(ellipse 50% 35% at 85% 10%, rgba(40, 90, 140, 0.18), transparent 60%),
    radial-gradient(ellipse 70% 50% at 50% 100%, rgba(60, 42, 110, 0.14), transparent 65%),
    var(--bg);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    radial-gradient(1px 1px at 12% 22%, rgba(255,255,255,0.55) 50%, transparent 51%),
    radial-gradient(1px 1px at 34% 8%,  rgba(255,255,255,0.35) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 58% 30%, rgba(232,197,116,0.5) 50%, transparent 51%),
    radial-gradient(1px 1px at 76% 14%, rgba(255,255,255,0.45) 50%, transparent 51%),
    radial-gradient(1px 1px at 90% 42%, rgba(167,139,250,0.4) 50%, transparent 51%),
    radial-gradient(1px 1px at 6% 58%,  rgba(255,255,255,0.3) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 44% 72%, rgba(125,211,252,0.35) 50%, transparent 51%),
    radial-gradient(1px 1px at 68% 88%, rgba(255,255,255,0.4) 50%, transparent 51%),
    radial-gradient(1px 1px at 25% 92%, rgba(232,197,116,0.35) 50%, transparent 51%),
    radial-gradient(1px 1px at 95% 74%, rgba(255,255,255,0.3) 50%, transparent 51%);
}

::selection { background: rgba(232, 197, 116, 0.3); }

a { color: var(--gold); text-decoration: none; transition: color 0.2s; }
a:hover { color: #f5dfa8; }

/* ── 顶部导航 ─────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: rgba(7, 11, 22, 0.78);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 8px;
  height: 60px;
}
.nav-logo {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.12em;
  margin-right: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
}
.nav-logo .ring {
  width: 22px; height: 22px;
  border: 1.5px solid var(--gold);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  flex: none;
}
.nav-links { display: flex; gap: 2px; flex-wrap: wrap; }
.nav-links a {
  color: var(--ink-dim);
  font-size: 14.5px;
  padding: 6px 11px;
  border-radius: 8px;
  white-space: nowrap;
}
.nav-links a:hover { color: var(--ink); background: rgba(140, 160, 220, 0.08); }
.nav-links a.active { color: var(--gold); background: rgba(232, 197, 116, 0.1); }

@media (max-width: 820px) {
  .nav-inner { height: auto; flex-direction: column; align-items: flex-start; padding: 10px 16px; }
  .nav-logo { margin-right: 0; }
  .nav-links { gap: 0; }
  .nav-links a { font-size: 13.5px; padding: 4px 8px; }
}

/* ── 版面 ─────────────────────────────────────────── */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.page-head { padding: 72px 0 40px; text-align: center; }
.page-head .kicker {
  font-size: 13px;
  letter-spacing: 0.35em;
  color: var(--gold-deep);
  text-transform: uppercase;
  margin-bottom: 14px;
}
.page-head h1 {
  font-family: var(--serif);
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 700;
  letter-spacing: 0.06em;
  background: linear-gradient(135deg, #f2e2b0 20%, var(--gold) 55%, #b8934a);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 16px;
}
.page-head .sub {
  color: var(--ink-dim);
  font-size: 16.5px;
  max-width: 640px;
  margin: 0 auto;
}

section { padding: 28px 0; }

h2 {
  font-family: var(--serif);
  font-size: 26px;
  color: #eee3c0;
  letter-spacing: 0.05em;
  margin: 36px 0 18px;
  display: flex;
  align-items: center;
  gap: 12px;
}
h2::before {
  content: "";
  width: 26px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold));
  flex: none;
}
h3 {
  font-family: var(--serif);
  font-size: 20px;
  color: var(--ink);
  margin: 26px 0 12px;
  letter-spacing: 0.04em;
}
p { margin: 0 0 14px; color: var(--ink); }
p.dim, .dim { color: var(--ink-dim); }
strong { color: #f0e6c8; font-weight: 600; }
em { color: var(--violet); font-style: normal; }

ul, ol { margin: 0 0 16px; padding-left: 24px; color: var(--ink); }
li { margin-bottom: 8px; }
li::marker { color: var(--gold-deep); }

/* ── 卡片 ─────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 28px;
  margin-bottom: 20px;
  backdrop-filter: blur(8px);
  transition: border-color 0.25s, background 0.25s, transform 0.25s;
}
.card:hover { border-color: var(--line-strong); }
.card h3 { margin-top: 0; }

.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

a.card-link { display: block; color: inherit; }
a.card-link:hover .card {
  background: var(--bg-card-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}
a.card-link .card { height: 100%; margin-bottom: 0; }

/* ── 引文 ─────────────────────────────────────────── */
blockquote {
  border-left: 2px solid var(--gold-deep);
  background: linear-gradient(90deg, rgba(232, 197, 116, 0.07), transparent 70%);
  padding: 18px 24px;
  margin: 22px 0;
  border-radius: 0 10px 10px 0;
  font-family: var(--serif);
  font-size: 17px;
  color: #e9dfc2;
  line-height: 2;
}
blockquote cite {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  color: var(--ink-faint);
  font-style: normal;
  font-family: var(--sans);
}

/* ── 标签 / 徽章 ──────────────────────────────────── */
.tag {
  display: inline-block;
  font-size: 12.5px;
  padding: 3px 12px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  color: var(--ink-dim);
  margin: 0 6px 8px 0;
  background: rgba(140, 160, 220, 0.06);
}
.tag.gold   { color: var(--gold);   border-color: rgba(232,197,116,0.4); background: rgba(232,197,116,0.08); }
.tag.violet { color: var(--violet); border-color: rgba(167,139,250,0.4); background: rgba(167,139,250,0.08); }
.tag.cyan   { color: var(--cyan);   border-color: rgba(125,211,252,0.4); background: rgba(125,211,252,0.08); }
.tag.rose   { color: var(--rose);   border-color: rgba(240,166,184,0.4); background: rgba(240,166,184,0.08); }

.num-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px; height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(232, 197, 116, 0.45);
  color: var(--gold);
  font-family: var(--serif);
  font-size: 17px;
  flex: none;
}

/* ── 表格 ─────────────────────────────────────────── */
.table-scroll { overflow-x: auto; margin: 20px 0; border-radius: var(--radius); border: 1px solid var(--line); }
table { width: 100%; border-collapse: collapse; background: rgba(14, 20, 40, 0.5); font-size: 15px; }
th {
  text-align: left;
  padding: 13px 18px;
  color: var(--gold);
  font-weight: 600;
  border-bottom: 1px solid var(--line-strong);
  background: rgba(20, 28, 52, 0.8);
  white-space: nowrap;
}
td { padding: 12px 18px; border-bottom: 1px solid var(--line); color: var(--ink); vertical-align: top; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(140, 160, 220, 0.04); }

/* ── 分隔符 ───────────────────────────────────────── */
.divider {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 48px 0;
  color: var(--gold-deep);
  font-size: 14px;
}
.divider::before, .divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
}

/* ── 页脚 ─────────────────────────────────────────── */
.footer {
  margin-top: 80px;
  border-top: 1px solid var(--line);
  background: rgba(7, 11, 22, 0.6);
  padding: 40px 0 48px;
  text-align: center;
  color: var(--ink-faint);
  font-size: 13.5px;
  line-height: 2;
}
.footer a { color: var(--ink-dim); }
.footer a:hover { color: var(--gold); }
.footer .foot-nav { margin-bottom: 12px; }
.footer .foot-nav a { margin: 0 10px; }

/* ── 首页 hero 专用 ───────────────────────────────── */
.hero {
  min-height: 78vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 24px 60px;
  position: relative;
}
.hero .glyph {
  width: 120px; height: 120px;
  margin-bottom: 36px;
  position: relative;
}
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(40px, 7vw, 68px);
  font-weight: 700;
  letter-spacing: 0.14em;
  background: linear-gradient(135deg, #f7ecc9 15%, var(--gold) 50%, #a8843c 90%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 10px;
}
.hero .en {
  font-family: var(--serif);
  font-size: clamp(15px, 2.2vw, 20px);
  letter-spacing: 0.55em;
  color: var(--ink-dim);
  text-transform: uppercase;
  margin-bottom: 30px;
}
.hero .tagline {
  font-size: clamp(16px, 2.4vw, 19px);
  color: var(--ink-dim);
  max-width: 560px;
  line-height: 2.1;
}
.hero .cta-row { margin-top: 44px; display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; }
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 999px;
  font-size: 15.5px;
  letter-spacing: 0.08em;
  transition: all 0.25s;
}
.btn-gold {
  background: linear-gradient(135deg, var(--gold), var(--gold-deep));
  color: #1a1408;
  font-weight: 600;
}
.btn-gold:hover { box-shadow: 0 6px 28px rgba(232, 197, 116, 0.35); transform: translateY(-2px); color: #1a1408; }
.btn-ghost {
  border: 1px solid var(--line-strong);
  color: var(--ink-dim);
}
.btn-ghost:hover { border-color: var(--gold-deep); color: var(--gold); }

/* ── 动效 ─────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fadeUp 0.8s ease both; }
.fade-up.d1 { animation-delay: 0.15s; }
.fade-up.d2 { animation-delay: 0.3s; }
.fade-up.d3 { animation-delay: 0.45s; }

@keyframes spin-slow { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  .fade-up { animation: none; }
  html { scroll-behavior: auto; }
}