/* ACoinSight 官网 — 博物馆美学：墨底、暖白、古金。减法到只剩本体。 */
:root {
  --bg: #1A1610;
  --bg-raise: #201B14;
  --ink: #E8DFD0;
  --ink-soft: rgba(232, 223, 208, 0.62);
  --ink-faint: rgba(232, 223, 208, 0.38);
  --gold: #C4A87C;
  --gold-soft: rgba(196, 168, 124, 0.35);
  --hairline: rgba(196, 168, 124, 0.18);
  --serif: 'Georgia', 'Iowan Old Style', 'Songti TC', 'Noto Serif TC', 'Hiragino Mincho ProN', 'Yu Mincho', serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-weight: 400;
  line-height: 1.9;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--gold); text-decoration: none; transition: opacity 0.25s ease; }
a:hover { opacity: 0.75; }

/* ── 页头 ── */
.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 28px clamp(24px, 6vw, 72px);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 15px;
  letter-spacing: 0.14em;
}
.brand-mark { display: block; opacity: 0.92; }
.langs { font-size: 13px; letter-spacing: 0.08em; }
.langs a { color: var(--ink-faint); }
.langs a:hover { color: var(--gold); opacity: 1; }
.langs .dot { color: var(--ink-faint); margin: 0 10px; }

/* ── 首页 hero：瑞鶴圖長卷恒速平移，開場停在鶴陣（畫卷右端），漂向題跋 ── */
.home .top { position: absolute; top: 0; left: 0; right: 0; z-index: 3; }
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 14vh clamp(24px, 6vw, 72px) 10vh;
  overflow: hidden;
}
.hero-scroll { position: absolute; inset: 0; z-index: 0; }
.hero-pan {
  position: absolute;
  top: 0; bottom: 0; left: 0;
  /* 图长宽比 4.92:1 → 高 100% 时宽 = 492vh；往复平移，速度恒定而极缓 */
  width: calc(100vh * 4.92);
  background-size: cover;
  background-position: left center;
  animation: heroPan 300s linear infinite alternate;
  will-change: transform;
}
@keyframes heroPan {
  from { transform: translateX(calc(-100vh * 4.92 + 100vw)); }
  to   { transform: translateX(0); }
}
.hero-veil {
  position: absolute; inset: 0; z-index: 1;
  background:
    linear-gradient(180deg, rgba(26,22,16,0.78) 0%, rgba(26,22,16,0.42) 30%, rgba(26,22,16,0.5) 62%, rgba(26,22,16,0.95) 100%),
    linear-gradient(90deg, rgba(26,22,16,0.5) 0%, rgba(26,22,16,0.28) 45%, rgba(26,22,16,0.55) 100%);
}
.hero-inner {
  position: relative; z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 5vw, 80px);
  align-items: center;
  width: 100%;
  max-width: 1360px;
}
.hero-credit {
  position: absolute;
  right: clamp(20px, 4vw, 48px);
  bottom: 18px;
  z-index: 2;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(232, 223, 208, 0.35);
}
@media (prefers-reduced-motion: reduce) {
  .hero-pan { animation: none; }
}

/* 左：珍泉悬于畫卷之上（与 app 同一效果：钱币直接浮在背景前，无衬底） */
.hero-stage { text-align: center; position: relative; }
.coin-loading {
  position: absolute; top: 0; left: 0; right: 0;
  height: min(74vh, 700px);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 18px; z-index: 1; pointer-events: none;
  transition: opacity 0.6s ease;
}
.coin-loading.done { opacity: 0; }
.coin-loading-mark {
  width: 46px; height: 46px;
  border: 1.5px solid var(--gold-soft);
  border-radius: 50%;
  position: relative;
  animation: coinPulse 2s ease-in-out infinite;
}
.coin-loading-mark::after { content: ''; position: absolute; inset: 13px; border: 1.5px solid var(--gold-soft); }
.coin-loading-pct { font-size: 13px; letter-spacing: 0.18em; color: var(--gold); }
@keyframes coinPulse { 0%, 100% { opacity: 0.45; } 50% { opacity: 1; } }
@media (prefers-reduced-motion: reduce) { .coin-loading-mark { animation: none; } }
model-viewer {
  /* ⚠️ 组件 shadow 样式自带 height:150px, aspect-ratio 不生效, 必须显式给高 */
  --progress-bar-color: transparent;
  width: 100%;
  height: min(74vh, 700px);
  margin: 0 auto;
  --poster-color: transparent;
}
.coin-name {
  margin-top: 2px;
  font-size: 17px;
  letter-spacing: 0.3em;
  text-indent: 0.3em;
  text-shadow: 0 1px 8px rgba(10, 8, 5, 0.8);
}
.coin-era {
  margin-top: 8px;
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: 0.1em;
  text-shadow: 0 1px 6px rgba(10, 8, 5, 0.8);
}
.coin-note {
  margin-top: 12px;
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.05em;
}

/* 右：铭牌（居中，与左侧珍泉等量齐观） */
.hero-brand { text-align: center; }
.hero-logo { display: block; width: 76px; height: 76px; margin: 0 auto 30px; opacity: 0.95; }
.hero h1 {
  font-size: clamp(40px, 4.8vw, 60px);
  font-weight: 400;
  letter-spacing: 0.14em;
}
.tagline {
  margin-top: 26px;
  font-size: clamp(19px, 2.1vw, 25px);
  color: var(--gold);
  letter-spacing: 0.16em;
}
.lede {
  margin-top: 22px;
  max-width: 24em;
  margin-left: auto;
  margin-right: auto;
  font-size: 16px;
  color: var(--ink-soft);
}
.cta { margin-top: 46px; }
.appstore {
  display: inline-block;
  padding: 14px 38px;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-size: 15px;
  letter-spacing: 0.12em;
  transition: background 0.3s ease, color 0.3s ease;
}
.appstore:hover {
  background: rgba(196, 168, 124, 0.12);
  opacity: 1;
}
.cta-note {
  margin-top: 12px;
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: 0.08em;
}

/* ── 展陈四厅：真迹大图 + 展签，左右交替 ── */
.exhibits { padding: 8vh 0 0; }
.exhibit {
  display: grid;
  grid-template-columns: 3fr 2fr;
  align-items: center;
  margin-bottom: 10vh;
}
.exhibit:nth-child(even) { grid-template-columns: 2fr 3fr; }
.exhibit:nth-child(even) .exhibit-art { order: 2; }
.exhibit-art {
  position: relative;
  height: min(64vh, 620px);
  overflow: hidden;
}
.exhibit-art img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}
.exhibit-art::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 110px;
  background: linear-gradient(180deg, transparent, rgba(10, 8, 5, 0.55));
  pointer-events: none;
}
.exhibit-art figcaption {
  position: absolute;
  left: 26px; bottom: 18px;
  z-index: 1;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(232, 223, 208, 0.85);
  text-shadow: 0 1px 6px rgba(10, 8, 5, 0.8);
}
.exhibit-label {
  padding: 6vh clamp(32px, 6vw, 96px);
}
.glyph {
  font-size: 28px;
  color: var(--gold);
  line-height: 1;
  border: 1px solid var(--hairline);
  width: 64px; height: 64px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 26px;
}
.exhibit-label h2 {
  font-size: 21px;
  font-weight: 400;
  letter-spacing: 0.14em;
  margin-bottom: 16px;
}
.exhibit-label p { color: var(--ink-soft); font-size: 15px; max-width: 24em; }

/* ── patronage ── */
.patronage {
  max-width: 720px;
  margin: 0 auto;
  padding: 10vh clamp(24px, 6vw, 48px) 12vh;
  text-align: center;
}
.patronage p {
  font-size: 15px;
  color: var(--ink-faint);
  letter-spacing: 0.06em;
  max-width: 30em;
  margin: 0 auto;
  position: relative;
  padding-top: 42px;
}
.patronage p::before {
  content: '';
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 40px;
  border-top: 1px solid var(--gold-soft);
}

/* ── 文档页（隐私/条款/支援）── */
.doc {
  max-width: 680px;
  margin: 0 auto;
  padding: 6vh clamp(24px, 6vw, 48px) 10vh;
}
.doc h1 {
  font-size: 30px;
  font-weight: 400;
  letter-spacing: 0.12em;
  margin-bottom: 10px;
}
.doc .updated {
  font-size: 13px;
  color: var(--ink-faint);
  margin-bottom: 40px;
}
.doc h2 {
  font-size: 20px;
  font-weight: 400;
  letter-spacing: 0.08em;
  margin: 52px 0 14px;
  padding-top: 30px;
  border-top: 1px solid var(--hairline);
}
.doc h3 {
  font-size: 16px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--gold);
  margin: 32px 0 10px;
}
.doc p { margin: 14px 0; font-size: 15px; color: var(--ink-soft); }
.doc strong { color: var(--ink); font-weight: 400; }
.doc u { text-decoration-color: var(--gold-soft); text-underline-offset: 4px; }
.doc ul { margin: 14px 0 14px 1.4em; }
.doc li { margin: 8px 0; font-size: 15px; color: var(--ink-soft); }
.doc code {
  font-family: ui-monospace, 'SF Mono', Menlo, monospace;
  font-size: 0.88em;
  color: var(--gold);
}
.support-mail { margin: 26px 0 40px; }
.support-mail a {
  font-size: 20px;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--gold-soft);
  padding-bottom: 3px;
}

.table-wrap { overflow-x: auto; margin: 20px 0; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
th, td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--hairline);
  color: var(--ink-soft);
}
th {
  color: var(--gold);
  font-weight: 400;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

/* ── 页脚 ── */
.foot {
  border-top: 1px solid var(--hairline);
  padding: 44px clamp(24px, 6vw, 72px) 56px;
  text-align: center;
}
.foot nav { margin-bottom: 16px; }
.foot nav a {
  color: var(--ink-faint);
  font-size: 13px;
  letter-spacing: 0.08em;
  margin: 0 14px;
}
.foot nav a:hover { color: var(--gold); opacity: 1; }
.foot p { font-size: 12px; color: var(--ink-faint); letter-spacing: 0.08em; }

@media (max-width: 900px) {
  .hero { min-height: auto; padding-top: 16vh; }
  .hero-inner { grid-template-columns: 1fr; gap: 48px; justify-items: center; }
  .hero-brand { text-align: center; }
  .hero-logo { margin-left: auto; margin-right: auto; }
  .hero-stage { width: min(420px, 86vw); }
  .exhibit, .exhibit:nth-child(even) { grid-template-columns: 1fr; margin-bottom: 6vh; }
  .exhibit:nth-child(even) .exhibit-art { order: 0; }
  .exhibit-art { height: 46vh; }
  .exhibit-label { padding: 5vh clamp(24px, 7vw, 48px) 2vh; }
}