/* ============================================================
   易学古典 · 观象明理 —— 全新视觉系统
   宣纸 / 墨色 / 朱砂 / 描金
   ============================================================ */

:root {
  --paper: #f3edde;
  --paper-deep: #eae2cd;
  --paper-warm: #efe7d4;
  --ink: #1c1812;
  --ink-soft: #3a342a;
  --ink-faint: #6d6353;
  --night: #14110c;
  --night-2: #1d1912;
  --night-3: #262016;
  --gold: #c2a05e;
  --gold-bright: #e0c084;
  --gold-dim: #8f7648;
  --vermillion: #a83226;
  --vermillion-deep: #8c271d;
  --line-paper: rgba(28, 24, 18, .14);
  --line-night: rgba(194, 160, 94, .22);
  --serif: "Noto Serif SC", "Songti SC", "STSong", "STZhongsong", "SimSun", serif;
  --brush: "Ma Shan Zheng", "Noto Serif SC", "Songti SC", serif;
  --ease-out: cubic-bezier(.22, 1, .36, 1);
  --noise: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  overflow-x: clip;
}

body {
  font-family: var(--serif);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--vermillion); color: var(--paper); }

img { max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

/* ---------- 开幕 ---------- */
.veil {
  position: fixed; inset: 0; z-index: 100;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 26px;
  background: var(--night);
  color: var(--gold);
  transition: opacity .7s var(--ease-out), visibility .7s;
}
.veil.done { opacity: 0; visibility: hidden; pointer-events: none; }
.veil-taiji { width: 72px; height: 72px; }
.taiji-svg { display: block; width: 100%; height: 100%; }
.taiji-svg.spin { animation: spin 2.6s linear infinite; }
.taiji-dot-a { fill: var(--night); }
.veil-word {
  font-family: var(--brush);
  font-size: 22px; letter-spacing: .35em; text-indent: .35em;
  color: var(--gold-bright);
  animation: veilPulse 1.8s ease-in-out infinite;
}
@keyframes veilPulse { 50% { opacity: .45; } }
@keyframes spin { to { transform: rotate(360deg); } }

/* 卷首锚点哨兵 */
.top-anchor { position: absolute; top: 0; left: 0; width: 1px; height: 1px; pointer-events: none; }

/* ---------- 页首 ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 60;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px clamp(20px, 4vw, 56px);
  transition: background .4s, box-shadow .4s, padding .4s;
}
.site-header.scrolled {
  background: rgba(20, 17, 12, .86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 var(--line-night), 0 12px 40px rgba(0, 0, 0, .35);
  padding-block: 10px;
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--paper); }
.brand-seal {
  display: grid; place-items: center;
  width: 42px; height: 42px;
  background: linear-gradient(145deg, var(--vermillion), var(--vermillion-deep));
  color: var(--paper);
  font-family: var(--brush); font-size: 24px;
  border-radius: 8px;
  box-shadow: inset 0 0 0 2px rgba(243, 237, 222, .55), 0 4px 14px rgba(168, 50, 38, .45);
  transform: rotate(-3deg);
}
.brand-name { display: flex; flex-direction: column; line-height: 1.25; }
.brand-name strong { font-size: 19px; letter-spacing: .22em; font-weight: 700; }
.brand-name small { font-size: 10px; letter-spacing: .34em; color: var(--gold); }

#main-nav { display: flex; gap: clamp(18px, 3vw, 40px); }
#main-nav a {
  position: relative;
  color: rgba(243, 237, 222, .88);
  font-size: 15px; letter-spacing: .28em; text-indent: .28em;
  padding: 6px 2px;
  transition: color .3s;
}
#main-nav a::after {
  content: ""; position: absolute; left: 10%; right: 100%; bottom: 0;
  height: 2px; background: linear-gradient(90deg, var(--vermillion), var(--gold));
  border-radius: 2px;
  transition: right .35s var(--ease-out);
}
#main-nav a:hover { color: var(--gold-bright); }
#main-nav a:hover::after { right: 10%; }

.nav-toggle {
  display: none;
  flex-direction: column; gap: 5px;
  background: none; border: 0; padding: 8px;
}
.nav-toggle span { width: 24px; height: 2px; background: var(--paper); border-radius: 2px; transition: .3s; }

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex; align-items: center;
  background:
    radial-gradient(1200px 600px at 78% -10%, rgba(194, 160, 94, .12), transparent 60%),
    linear-gradient(180deg, #100d09 0%, var(--night) 46%, #191510 100%);
  color: var(--paper);
  overflow: hidden;
}
#hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }

.hero-scene { position: absolute; inset: 0; pointer-events: none; }
.hero-sun {
  position: absolute; right: 23%; top: 9%;
  width: clamp(100px, 12vw, 170px); aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 42% 38%, #d6543f, var(--vermillion) 55%, var(--vermillion-deep));
  box-shadow: 0 0 90px 24px rgba(168, 50, 38, .38);
  opacity: .92;
}
.mountains { position: absolute; left: 0; right: 0; bottom: -2px; width: 100%; height: min(46vh, 420px); }
.mountains-far { fill: #231e15; opacity: .8; }
.mountains-mid { fill: #1b1710; opacity: .92; }
.mountains-near { fill: #12100b; }
.hero-mist {
  position: absolute; left: 0; right: 0; bottom: 0; height: 30vh;
  background: linear-gradient(180deg, transparent, rgba(20, 17, 12, .65) 60%, rgba(20, 17, 12, .95));
}

.hero-content {
  position: relative; z-index: 3;
  padding: 120px clamp(24px, 7vw, 110px) 160px;
  max-width: 780px;
}
.hero-kicker {
  display: flex; align-items: center; gap: 14px;
  font-size: 14px; letter-spacing: .4em; text-indent: 0;
  color: var(--gold);
  margin-bottom: 30px;
}
.hero-kicker i { width: 56px; height: 1px; background: linear-gradient(90deg, var(--gold), transparent); }
#hero-title {
  display: flex; flex-direction: column;
  font-size: clamp(64px, 11vw, 138px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: .06em;
  background: linear-gradient(160deg, #f7f1e2 30%, var(--gold-bright) 78%, var(--gold));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 30px 80px rgba(0, 0, 0, .4);
  margin-bottom: 30px;
}
.hero-lead {
  font-size: clamp(16px, 1.6vw, 19px);
  color: rgba(243, 237, 222, .82);
  letter-spacing: .1em;
  margin-bottom: 42px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 34px;
  font-size: 15px; letter-spacing: .3em; text-indent: .3em;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform .35s var(--ease-out), box-shadow .35s, background .35s, color .35s, border-color .35s;
}
.btn:hover { transform: translateY(-3px); }
.btn-gold {
  background: linear-gradient(135deg, var(--gold-bright), var(--gold) 55%, var(--gold-dim));
  color: #241d0e; font-weight: 700;
  box-shadow: 0 10px 30px rgba(194, 160, 94, .35);
}
.btn-gold:hover { box-shadow: 0 16px 42px rgba(194, 160, 94, .5); }
.btn-ghost {
  border-color: rgba(243, 237, 222, .35);
  color: var(--paper);
}
.btn-ghost:hover { border-color: var(--gold); color: var(--gold-bright); background: rgba(194, 160, 94, .08); }

/* 首屏八卦盘 */
.hero-disc {
  position: absolute; z-index: 2;
  right: clamp(30px, 7vw, 120px); top: 50%;
  width: clamp(280px, 30vw, 430px); aspect-ratio: 1;
  transform: translateY(-52%);
  opacity: .9;
}
.disc-ring {
  position: absolute; inset: 0; border-radius: 50%;
  border: 1px solid rgba(194, 160, 94, .3);
  box-shadow: inset 0 0 60px rgba(194, 160, 94, .07);
}
.disc-ring::before {
  content: ""; position: absolute; inset: 12%;
  border-radius: 50%; border: 1px dashed rgba(194, 160, 94, .25);
}
.disc-trigrams { position: absolute; inset: 0; animation: spin 90s linear infinite; }
.disc-trigrams span {
  position: absolute;
  transform: translate(-50%, -50%);
  font-size: clamp(22px, 2.4vw, 32px);
  color: var(--gold);
  text-shadow: 0 0 18px rgba(194, 160, 94, .45);
  animation: spin 90s linear infinite reverse;
}
.disc-core {
  position: absolute; inset: 27%;
  width: auto; height: auto;
  color: var(--gold);
  animation: spin 36s linear infinite reverse;
  filter: drop-shadow(0 0 14px rgba(194, 160, 94, .35));
}

.hero-vertical {
  position: absolute; z-index: 3;
  right: clamp(14px, 2.4vw, 34px); top: 50%;
  transform: translateY(-50%);
  writing-mode: vertical-rl;
  letter-spacing: .5em;
  font-size: 14px;
  color: rgba(243, 237, 222, .5);
}
.hero-index {
  position: absolute; z-index: 3;
  left: clamp(24px, 7vw, 110px); bottom: 118px;
  display: flex; align-items: center; gap: 12px;
  font-size: 12px; letter-spacing: .3em;
  color: rgba(243, 237, 222, .45);
}
.hero-index i { width: 42px; height: 1px; background: rgba(194, 160, 94, .4); }

.hero-scroll {
  position: absolute; z-index: 3;
  left: 50%; bottom: 34px; transform: translateX(-50%);
  width: 26px; height: 44px;
  border: 1px solid rgba(243, 237, 222, .35);
  border-radius: 14px;
}
.hero-scroll span {
  position: absolute; left: 50%; top: 8px;
  width: 3px; height: 8px; margin-left: -1.5px;
  border-radius: 3px; background: var(--gold);
  animation: scrollHint 1.8s ease-in-out infinite;
}
@keyframes scrollHint { 55% { transform: translateY(16px); opacity: 0; } 56% { transform: translateY(0); opacity: 0; } 100% { opacity: 1; } }

/* ---------- 体系数据带 ---------- */
.heritage-ribbon {
  position: relative; z-index: 4;
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line-night);
  border-block: 1px solid var(--line-night);
  margin-top: -1px;
}
.ribbon-item {
  background: linear-gradient(180deg, var(--night-2), var(--night));
  padding: clamp(24px, 3.4vw, 44px) 20px;
  text-align: center;
  color: var(--paper);
  transition: background .4s;
}
.ribbon-item:hover { background: linear-gradient(180deg, var(--night-3), var(--night-2)); }
.ribbon-item span { display: block; font-size: 14px; letter-spacing: .4em; text-indent: .4em; color: var(--gold); margin-bottom: 8px; }
.ribbon-item strong {
  display: block;
  font-size: clamp(34px, 4vw, 52px); font-weight: 900; line-height: 1.1;
  background: linear-gradient(180deg, #f2e8d2, var(--gold));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.ribbon-item small { display: block; margin-top: 8px; font-size: 12px; letter-spacing: .12em; color: rgba(243, 237, 222, .55); }

/* ---------- 通用版块 ---------- */
.section { position: relative; padding: clamp(90px, 11vw, 160px) clamp(24px, 7vw, 110px); }
.section-number {
  position: absolute; top: clamp(40px, 6vw, 80px); right: clamp(20px, 6vw, 90px);
  font-family: var(--brush);
  font-size: clamp(110px, 16vw, 220px);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(28, 24, 18, .16);
  pointer-events: none; user-select: none;
}
.section-number.light { -webkit-text-stroke: 1px rgba(194, 160, 94, .25); }

.eyebrow {
  display: inline-flex; align-items: center; gap: 12px;
  font-size: 14px; letter-spacing: .5em; text-indent: 0;
  color: var(--vermillion);
  margin-bottom: 18px;
}
.eyebrow::before { content: ""; width: 34px; height: 1px; background: currentColor; }
.eyebrow.gold { color: var(--gold); }

h2 {
  font-size: clamp(34px, 4.6vw, 58px);
  font-weight: 900; line-height: 1.28;
  letter-spacing: .08em;
}

/* ---------- 壹 · 易之源 ---------- */
.origins {
  background: var(--paper) var(--noise);
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: clamp(40px, 6vw, 90px);
  align-items: start;
}
.section-heading { position: relative; }
.vermillion-seal {
  position: absolute; right: 6px; bottom: -14px;
  display: grid; grid-template-columns: 1fr 1fr;
  width: 76px; height: 76px;
  background: linear-gradient(145deg, var(--vermillion), var(--vermillion-deep));
  color: var(--paper);
  border-radius: 10px;
  box-shadow: inset 0 0 0 2px rgba(243, 237, 222, .5), 0 8px 24px rgba(168, 50, 38, .35);
  transform: rotate(4deg);
  overflow: hidden;
}
.vermillion-seal span {
  display: grid; place-items: center;
  font-family: var(--brush); font-size: 22px; line-height: 1;
}
.intro-copy .lead { font-size: clamp(19px, 2vw, 24px); font-weight: 700; letter-spacing: .04em; margin-bottom: 18px; }
.intro-copy > p:not(.lead) { color: var(--ink-soft); max-width: 34em; }
.quote {
  position: relative;
  margin-top: 38px; padding: 30px 34px 24px;
  background: rgba(255, 252, 244, .7);
  border: 1px solid var(--line-paper);
  border-left: 4px solid var(--vermillion);
  border-radius: 4px 14px 14px 4px;
  box-shadow: 0 18px 44px rgba(28, 24, 18, .08);
}
.quote-mark {
  position: absolute; top: -30px; left: 8px;
  font-size: 84px; font-family: var(--brush);
  color: rgba(168, 50, 38, .3);
}
.quote blockquote { font-size: clamp(18px, 1.9vw, 22px); font-weight: 600; letter-spacing: .05em; }
.quote cite { display: block; margin-top: 12px; font-size: 13px; font-style: normal; letter-spacing: .2em; color: var(--ink-faint); }

/* 太极衍生图 */
.genesis {
  grid-column: 1 / -1;
  margin-top: clamp(30px, 5vw, 60px);
  padding: clamp(30px, 4vw, 54px);
  background: rgba(255, 252, 244, .55);
  border: 1px solid var(--line-paper);
  border-radius: 18px;
  box-shadow: 0 24px 60px rgba(28, 24, 18, .07);
}
.genesis-caption {
  text-align: center;
  font-size: clamp(16px, 1.8vw, 20px); font-weight: 700;
  letter-spacing: .3em; text-indent: .3em;
  color: var(--ink-soft);
  margin-bottom: clamp(28px, 4vw, 44px);
}
.genesis-row {
  display: flex; justify-content: center; align-items: flex-end; flex-wrap: wrap;
  gap: 22px clamp(10px, 2vw, 26px);
  margin-bottom: clamp(18px, 2.6vw, 30px);
}
.genesis-row:last-child { margin-bottom: 0; }
.genesis-cell { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.genesis-cell small { font-size: 12px; letter-spacing: .18em; color: var(--ink-faint); white-space: nowrap; }
.genesis-bar { display: block; width: clamp(64px, 9vw, 130px); height: 12px; border-radius: 3px; background: var(--ink); }
.bar-taiji { background: linear-gradient(90deg, var(--ink) 50%, var(--paper) 50%); box-shadow: inset 0 0 0 1px var(--ink); border-radius: 999px; height: 14px; }
.bar-yin { display: flex; justify-content: space-between; background: none; }
.bar-yin i { width: 44%; height: 12px; border-radius: 3px; background: var(--ink); }
.genesis-stack { display: flex; flex-direction: column; gap: 5px; width: clamp(52px, 7vw, 96px); }
.genesis-stack b { display: block; height: 10px; border-radius: 3px; background: var(--ink); }
.genesis-stack b.yin { background: linear-gradient(90deg, var(--ink) 44%, transparent 44%, transparent 56%, var(--ink) 56%); }
.genesis-bagua .genesis-cell { transition: transform .3s var(--ease-out); }
.genesis-bagua .genesis-cell:hover { transform: translateY(-4px); }
.genesis .reveal-bar { transform-origin: center; }

/* ---------- 贰 · 八卦 ---------- */
.trigrams-band {
  position: relative;
  background:
    radial-gradient(900px 500px at 50% -10%, rgba(194, 160, 94, .1), transparent 65%),
    linear-gradient(180deg, var(--night) 0%, #171310 60%, var(--night) 100%);
  color: var(--paper);
  overflow: hidden;
}
.trigrams-band::before {
  content: ""; position: absolute; inset: 0;
  background: var(--noise); opacity: .5; pointer-events: none;
}
.trigrams-inner { position: relative; }
.trigrams-head {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 70px);
  align-items: end;
  margin-bottom: clamp(50px, 7vw, 90px);
}
.trigrams-head h2 { color: var(--paper); }
.trigrams-head > p { color: rgba(243, 237, 222, .72); max-width: 36em; }
.trigrams-head em { display: inline-block; margin-top: 12px; font-style: normal; color: var(--gold); letter-spacing: .14em; font-size: 14px; }

.trigram-stage {
  display: grid;
  grid-template-columns: minmax(280px, 460px) minmax(0, 1fr);
  gap: clamp(36px, 6vw, 90px);
  align-items: center;
}
.trigram-compass {
  position: relative;
  width: min(100%, 440px); aspect-ratio: 1;
  margin-inline: auto;
}
.compass-ring { position: absolute; border-radius: 50%; pointer-events: none; }
.ring-outer {
  inset: 0;
  border: 1px solid var(--line-night);
  background: radial-gradient(circle, rgba(194, 160, 94, .05), transparent 68%);
  animation: spin 120s linear infinite;
}
.ring-outer::before {
  content: ""; position: absolute; inset: -1px; border-radius: 50%;
  background: conic-gradient(from 0deg, transparent 0 42deg, rgba(194, 160, 94, .5) 42deg 43deg, transparent 43deg 87deg, rgba(194, 160, 94, .5) 87deg 88deg, transparent 88deg 132deg, rgba(194, 160, 94, .5) 132deg 133deg, transparent 133deg 177deg, rgba(194, 160, 94, .5) 177deg 178deg, transparent 178deg 222deg, rgba(194, 160, 94, .5) 222deg 223deg, transparent 223deg 267deg, rgba(194, 160, 94, .5) 267deg 268deg, transparent 268deg 312deg, rgba(194, 160, 94, .5) 312deg 313deg, transparent 313deg 357deg, rgba(194, 160, 94, .5) 357deg 358deg, transparent 358deg);
}
.ring-inner { inset: 26%; border: 1px dashed rgba(194, 160, 94, .28); }
.compass-core { position: absolute; inset: 31%; width: auto; height: auto; color: var(--gold); animation: spin 48s linear infinite reverse; pointer-events: none; }

.compass-btn {
  position: absolute;
  width: clamp(58px, 13%, 76px); aspect-ratio: 1;
  display: grid; place-items: center;
  background: rgba(29, 25, 18, .85);
  border: 1px solid rgba(194, 160, 94, .3);
  border-radius: 50%;
  color: var(--gold-bright);
  font-size: clamp(22px, 5vw, 30px);
  transform: translate(-50%, -50%);
  transition: box-shadow .35s, border-color .35s, background .35s, scale .35s;
}
.compass-btn:hover { border-color: var(--gold); box-shadow: 0 0 24px rgba(194, 160, 94, .35); scale: 1.08; }
.compass-btn.active {
  background: linear-gradient(145deg, var(--vermillion), var(--vermillion-deep));
  border-color: rgba(243, 237, 222, .6);
  color: var(--paper);
  box-shadow: 0 0 30px rgba(168, 50, 38, .55);
}

.trigram-detail {
  position: relative;
  display: flex; gap: clamp(18px, 3vw, 34px); align-items: flex-start;
  padding: clamp(26px, 3.4vw, 44px);
  background: rgba(29, 25, 18, .6);
  border: 1px solid var(--line-night);
  border-radius: 18px;
  backdrop-filter: blur(8px);
}
.trigram-detail-number {
  font-size: clamp(48px, 6vw, 84px); font-weight: 900; line-height: 1;
  color: transparent; -webkit-text-stroke: 1px rgba(194, 160, 94, .55);
}
.trigram-detail-body { flex: 1; }
.trigram-detail-lines { display: flex; flex-direction: column; gap: 6px; width: 84px; margin-bottom: 18px; }
.trigram-detail-lines i { display: block; height: 11px; border-radius: 3px; background: var(--gold); }
.trigram-detail-lines i.yin { background: linear-gradient(90deg, var(--gold) 42%, transparent 42%, transparent 58%, var(--gold) 58%); }
.trigram-detail h3 { font-size: clamp(26px, 3vw, 36px); font-weight: 900; letter-spacing: .12em; color: var(--paper); }
.trigram-nature { margin: 8px 0 12px; font-size: 14px; letter-spacing: .3em; color: var(--gold); }
.trigram-detail p:last-child { color: rgba(243, 237, 222, .78); }

/* ---------- 叁 · 六十四卦 ---------- */
.hexagrams { background: var(--paper) var(--noise); }
.hexagrams-head {
  display: grid; grid-template-columns: minmax(0, 1fr) auto;
  gap: clamp(28px, 5vw, 70px);
  align-items: end;
  margin-bottom: clamp(34px, 5vw, 54px);
}
.daily-hexagram {
  display: grid;
  grid-template-columns: auto auto;
  grid-template-rows: auto auto auto;
  column-gap: 18px;
  align-items: center;
  text-align: left;
  padding: 22px 26px;
  background: linear-gradient(150deg, var(--night-2), var(--night));
  color: var(--paper);
  border: 1px solid var(--line-night);
  border-radius: 16px;
  box-shadow: 0 20px 50px rgba(20, 17, 12, .25);
  transition: transform .35s var(--ease-out), box-shadow .35s;
}
.daily-hexagram:hover { transform: translateY(-4px); box-shadow: 0 28px 64px rgba(20, 17, 12, .35); }
.daily-label { grid-column: 1 / -1; font-size: 12px; letter-spacing: .5em; text-indent: .5em; color: var(--gold); margin-bottom: 10px; }
.daily-lines { display: flex; flex-direction: column; gap: 4px; width: 58px; grid-row: 2; }
.daily-lines i { display: block; height: 8px; border-radius: 2px; background: var(--gold); }
.daily-lines i.yin { background: linear-gradient(90deg, var(--gold) 40%, transparent 40%, transparent 60%, var(--gold) 60%); }
.daily-meta b { display: block; font-size: 24px; letter-spacing: .14em; }
.daily-meta small { color: rgba(243, 237, 222, .6); letter-spacing: .2em; }
.daily-hint { grid-column: 1 / -1; margin-top: 12px; font-size: 12px; letter-spacing: .2em; color: #e0664f; }

.hexagram-tools {
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  margin-bottom: clamp(26px, 4vw, 40px);
}
.search-wrap {
  position: relative; flex: 1; min-width: 240px; max-width: 460px;
}
.search-icon {
  position: absolute; left: 18px; top: 50%; transform: translateY(-50%);
  font-size: 20px; color: var(--ink-faint);
}
#hexagram-search {
  width: 100%;
  padding: 15px 20px 15px 50px;
  font-family: inherit; font-size: 15px; letter-spacing: .08em;
  color: var(--ink);
  background: rgba(255, 252, 244, .8);
  border: 1px solid var(--line-paper);
  border-radius: 999px;
  outline: none;
  transition: border-color .3s, box-shadow .3s;
}
#hexagram-search:focus { border-color: var(--vermillion); box-shadow: 0 0 0 4px rgba(168, 50, 38, .12); }
#result-count {
  font-size: 14px; letter-spacing: .24em;
  color: var(--ink-faint);
  padding: 8px 18px;
  border: 1px dashed var(--line-paper);
  border-radius: 999px;
}

.hexagram-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(128px, 1fr));
  gap: 14px;
}
.hex-card {
  position: relative;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  padding: 20px 12px 16px;
  background: rgba(255, 252, 244, .72);
  border: 1px solid var(--line-paper);
  border-radius: 14px;
  transition: transform .3s var(--ease-out), box-shadow .3s, border-color .3s, background .3s;
  overflow: hidden;
}
.hex-card::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(160deg, rgba(168, 50, 38, .06), transparent 55%);
  opacity: 0; transition: opacity .3s;
}
.hex-card:hover {
  transform: translateY(-5px);
  border-color: rgba(168, 50, 38, .4);
  box-shadow: 0 18px 40px rgba(28, 24, 18, .12);
}
.hex-card:hover::before { opacity: 1; }
.hex-card .hex-lines { display: flex; flex-direction: column; gap: 3.5px; width: 52px; }
.hex-card .hex-lines i { display: block; height: 6.5px; border-radius: 2px; background: var(--ink); transition: background .3s; }
.hex-card .hex-lines i.yin { background: linear-gradient(90deg, var(--ink) 40%, transparent 40%, transparent 60%, var(--ink) 60%); }
.hex-card:hover .hex-lines i { background: var(--vermillion); }
.hex-card:hover .hex-lines i.yin { background: linear-gradient(90deg, var(--vermillion) 40%, transparent 40%, transparent 60%, var(--vermillion) 60%); }
.hex-card b { font-size: 16px; letter-spacing: .14em; font-weight: 700; }
.hex-card small { font-size: 11px; letter-spacing: .2em; color: var(--ink-faint); }
.hex-card.is-today { border-color: var(--vermillion); box-shadow: 0 0 0 3px rgba(168, 50, 38, .14); }
.hex-card.is-today::after {
  content: "今日"; position: absolute; top: 8px; right: -26px;
  padding: 2px 30px;
  background: var(--vermillion); color: var(--paper);
  font-size: 10px; letter-spacing: .2em;
  transform: rotate(38deg);
}

/* ---------- 肆 · 研习路径 ---------- */
.path-section {
  position: relative;
  background:
    radial-gradient(800px 400px at 15% 0%, rgba(194, 160, 94, .08), transparent 60%),
    linear-gradient(180deg, var(--night), #181410);
  color: var(--paper);
}
.path-section::before { content: ""; position: absolute; inset: 0; background: var(--noise); opacity: .5; pointer-events: none; }
.path-inner { position: relative; }
.path-heading { margin-bottom: clamp(44px, 6vw, 70px); }
.path-heading h2 { color: var(--paper); }
.path-list {
  list-style: none;
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: clamp(16px, 2.4vw, 28px);
}
.path-list li {
  position: relative;
  padding: clamp(24px, 3vw, 36px);
  background: rgba(29, 25, 18, .65);
  border: 1px solid var(--line-night);
  border-radius: 16px;
  transition: transform .35s var(--ease-out), border-color .35s, box-shadow .35s;
}
.path-list li:hover {
  transform: translateY(-6px);
  border-color: rgba(194, 160, 94, .5);
  box-shadow: 0 24px 50px rgba(0, 0, 0, .35);
}
.path-no {
  display: inline-grid; place-items: center;
  width: 52px; height: 52px;
  margin-bottom: 18px;
  font-family: var(--brush); font-size: 26px;
  color: var(--paper);
  background: linear-gradient(145deg, var(--vermillion), var(--vermillion-deep));
  border-radius: 12px;
  box-shadow: inset 0 0 0 2px rgba(243, 237, 222, .4);
  transform: rotate(-4deg);
}
.path-list h3 { font-size: 21px; letter-spacing: .2em; margin-bottom: 10px; color: var(--gold-bright); }
.path-list p { font-size: 14.5px; color: rgba(243, 237, 222, .72); }
.path-line {
  position: absolute; top: 50px; right: calc(clamp(16px, 2.4vw, 28px) * -1);
  width: clamp(16px, 2.4vw, 28px); height: 1px;
  background: linear-gradient(90deg, var(--gold), transparent);
}

/* ---------- 结语 ---------- */
.closing {
  position: relative;
  padding: clamp(110px, 15vw, 210px) 24px;
  background:
    radial-gradient(700px 340px at 50% 110%, rgba(168, 50, 38, .16), transparent 65%),
    linear-gradient(180deg, #181410, var(--night));
  color: var(--paper);
  text-align: center;
  overflow: hidden;
}
.closing::before { content: ""; position: absolute; inset: 0; background: var(--noise); opacity: .5; }
.closing-inner { position: relative; }
.closing-kicker { font-size: 14px; letter-spacing: .6em; text-indent: .6em; color: var(--gold); margin-bottom: 26px; }
.closing h2 {
  font-family: var(--brush);
  font-size: clamp(42px, 7vw, 88px);
  font-weight: 400;
  line-height: 1.5;
  background: linear-gradient(180deg, #f5eeda, var(--gold-bright));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 18px;
}
.closing-cite { font-size: 13px; letter-spacing: .3em; color: rgba(243, 237, 222, .5); margin-bottom: 46px; }

/* ---------- 卦象详情弹窗 ---------- */
.gua-modal { position: fixed; inset: 0; z-index: 80; display: grid; place-items: center; padding: 20px; }
.gua-modal[hidden] { display: none; }
.modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(16, 13, 9, .72);
  backdrop-filter: blur(6px);
  animation: fadeIn .3s;
}
.modal-panel {
  position: relative;
  width: min(560px, 100%);
  max-height: min(86vh, 720px);
  overflow-y: auto;
  background: var(--paper) var(--noise);
  border: 1px solid rgba(194, 160, 94, .35);
  border-radius: 22px;
  box-shadow: 0 40px 110px rgba(0, 0, 0, .5);
  padding: clamp(28px, 4vw, 44px);
  animation: modalUp .4s var(--ease-out);
}
@keyframes fadeIn { from { opacity: 0; } }
@keyframes modalUp { from { opacity: 0; transform: translateY(26px) scale(.97); } }
.modal-close {
  position: absolute; top: 14px; right: 16px;
  width: 40px; height: 40px;
  border: 1px solid var(--line-paper); border-radius: 50%;
  background: none; font-size: 22px; color: var(--ink-faint);
  transition: .3s;
}
.modal-close:hover { color: var(--vermillion); border-color: var(--vermillion); transform: rotate(90deg); }
.modal-head { display: flex; gap: 26px; align-items: center; padding-bottom: 24px; border-bottom: 1px solid var(--line-paper); }
.modal-lines { display: flex; flex-direction: column; gap: 7px; width: 96px; flex-shrink: 0; }
.modal-lines i { display: block; height: 12px; border-radius: 3px; background: var(--ink); }
.modal-lines i.yin { background: linear-gradient(90deg, var(--ink) 42%, transparent 42%, transparent 58%, var(--ink) 58%); }
.modal-title small { font-size: 13px; letter-spacing: .34em; color: var(--vermillion); }
.modal-title h3 { font-size: clamp(30px, 5vw, 40px); font-weight: 900; letter-spacing: .1em; line-height: 1.3; }
.modal-compose { font-size: 14px; letter-spacing: .2em; color: var(--ink-faint); margin-top: 4px; }
.modal-body { padding: 24px 0; }
.modal-caption {
  display: inline-block;
  padding: 4px 14px; margin-bottom: 14px;
  font-size: 12px; letter-spacing: .4em; text-indent: .4em;
  color: var(--paper); background: var(--vermillion);
  border-radius: 4px;
}
.modal-judgment { font-size: clamp(16px, 2vw, 19px); line-height: 2; letter-spacing: .04em; color: var(--ink-soft); }
.modal-foot { display: flex; justify-content: space-between; gap: 12px; padding-top: 20px; border-top: 1px solid var(--line-paper); }
.modal-nav {
  padding: 10px 20px;
  background: none;
  border: 1px solid var(--line-paper); border-radius: 999px;
  font-size: 14px; letter-spacing: .16em; color: var(--ink-soft);
  transition: .3s;
}
.modal-nav:hover { border-color: var(--vermillion); color: var(--vermillion); }

/* ---------- 页脚 ---------- */
.site-footer {
  display: flex; flex-direction: column; align-items: center; gap: 22px;
  padding: 54px 24px 44px;
  background: #100d09;
  color: rgba(243, 237, 222, .65);
  text-align: center;
  border-top: 1px solid var(--line-night);
}
.footer-brand { display: flex; align-items: center; gap: 14px; color: var(--paper); }
.footer-brand b { display: block; font-size: 17px; letter-spacing: .26em; }
.footer-brand small { font-size: 11px; letter-spacing: .3em; color: var(--gold); }
.compliance { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px 28px; font-size: 13px; }
.compliance a { display: inline-flex; align-items: center; gap: 7px; opacity: .75; transition: opacity .3s, color .3s; }
.compliance a:hover { opacity: 1; color: var(--gold-bright); }
.compliance img { border-radius: 2px; }
.copyright { font-size: 12.5px; letter-spacing: .14em; opacity: .6; }

/* ---------- 滚动显现 ---------- */
.reveal { opacity: 0; transform: translateY(34px); transition: opacity .9s var(--ease-out), transform .9s var(--ease-out); }
.reveal.visible { opacity: 1; transform: none; }
.reveal-stagger > * { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease-out), transform .7s var(--ease-out); }
.reveal-stagger.visible > * { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero-disc { opacity: .4; right: -40px; }
  .path-list { grid-template-columns: repeat(2, 1fr); }
  .path-line { display: none; }
}
@media (max-width: 820px) {
  .origins { grid-template-columns: 1fr; }
  .trigrams-head { grid-template-columns: 1fr; align-items: start; }
  .trigram-stage { grid-template-columns: 1fr; }
  .hexagrams-head { grid-template-columns: 1fr; }
  .daily-hexagram { justify-self: start; }
  .vermillion-seal { position: static; margin-top: 26px; transform: rotate(3deg); }
}
@media (max-width: 640px) {
  html { scroll-padding-top: 70px; }
  .nav-toggle { display: flex; z-index: 70; }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  #main-nav {
    position: fixed; inset: 0;
    flex-direction: column; align-items: center; justify-content: center; gap: 34px;
    background: rgba(16, 13, 9, .96);
    backdrop-filter: blur(12px);
    opacity: 0; visibility: hidden; transition: opacity .35s, visibility .35s;
  }
  #main-nav.open { opacity: 1; visibility: visible; }
  #main-nav a { font-size: 22px; }
  .heritage-ribbon { grid-template-columns: repeat(2, 1fr); }
  .hero-vertical, .hero-index { display: none; }
  .hero-content { padding-bottom: 120px; }
  .hero-kicker { font-size: 12px; letter-spacing: .22em; gap: 10px; flex-wrap: wrap; }
  .hero-kicker i { width: 30px; }
  .hero-disc { width: 260px; right: -110px; top: 56%; opacity: .2; }
  .hexagram-grid { grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); gap: 10px; }
  .path-list { grid-template-columns: 1fr; }
  .modal-head { flex-direction: column; align-items: flex-start; }
  .section-number { font-size: 92px; }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
  .reveal, .reveal-stagger > * { opacity: 1; transform: none; }
}