/* ============================================================
   沈家本故居官方网站 · 样式表
   色彩：故宫红 #8B0000 / 古铜金 #C5A258 / 宣纸米白 #F5F0E8
   ============================================================ */

/* ---------- 基础变量 ---------- */
:root {
  --red: #8B0000;
  --red-deep: #6b0a0a;
  --red-dark: #4d0606;
  --gold: #C5A258;
  --gold-light: #ddc285;
  --gold-pale: #ecdcB2;
  --paper: #F5F0E8;
  --paper-deep: #ECE4D6;
  --paper-card: #fbf8f2;
  --ink: #2C2C2C;
  --ink-soft: #55504a;
  --ink-mute: #8a8175;
  --indigo: #1A3A5C;
  --indigo-deep: #0f2742;
  --indigo-darker: #0a1d33;
  --shadow: 0 12px 36px rgba(60, 40, 20, .12);
  --shadow-lg: 0 22px 60px rgba(40, 20, 10, .22);
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --kai: "Kaiti SC", "STKaiti", "KaiTi", "FangSong", serif;
  --header-h: 72px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 12px); }

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.85;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 极低透明度法典文字底纹（全局点缀） */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Ctext x='8' y='30' font-family='serif' font-size='22' fill='%238B0000' opacity='0.05'%3E律%3C/text%3E%3Ctext x='95' y='78' font-family='serif' font-size='18' fill='%238B0000' opacity='0.045'%3E法%3C/text%3E%3Ctext x='30' y='130' font-family='serif' font-size='20' fill='%238B0000' opacity='0.04'%3E典%3C/text%3E%3C/svg%3E");
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 28px; position: relative; z-index: 1; }

/* ---------- 滚动进度条 ---------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--red), var(--gold));
  z-index: 1001;
  transition: width .12s linear;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  transition: background .4s ease, box-shadow .4s ease, backdrop-filter .4s ease;
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  height: var(--header-h);
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-header.scrolled {
  background: rgba(245, 240, 232, .92);
  backdrop-filter: blur(14px);
  box-shadow: 0 2px 22px rgba(60, 30, 10, .1);
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-seal {
  width: 44px; height: 44px;
  object-fit: contain;
  border-radius: 6px;
  transform: rotate(-3deg);
  transition: transform .4s ease, filter .4s ease;
  filter: drop-shadow(0 3px 8px rgba(80, 10, 10, .28));
}
.brand:hover .brand-seal { transform: rotate(3deg) scale(1.05); }
.brand-seal.large { width: 60px; height: 60px; flex: none; filter: drop-shadow(0 4px 12px rgba(0,0,0,.45)); }
.brand-text strong {
  display: block;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 3px;
  line-height: 1.3;
}
.brand-text em {
  display: block;
  font-style: normal;
  font-size: 9.5px;
  letter-spacing: 1.6px;
  color: var(--ink-mute);
}
.site-header:not(.scrolled) .brand-text strong { color: #f3ead7; text-shadow: 0 2px 8px rgba(0,0,0,.5); }
.site-header:not(.scrolled) .brand-text em { color: rgba(243,234,215,.7); }

.main-nav { display: flex; gap: 6px; }
.main-nav a {
  position: relative;
  padding: 8px 14px;
  font-size: 15.5px;
  font-weight: 500;
  letter-spacing: 2px;
  border-radius: 6px;
  transition: color .3s;
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 14px; right: 14px; bottom: 2px;
  height: 2px;
  background: linear-gradient(90deg, var(--red), var(--gold));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s cubic-bezier(.22,1,.36,1);
}
.main-nav a:hover::after, .main-nav a.active::after { transform: scaleX(1); }
.site-header:not(.scrolled) .main-nav a { color: rgba(247,240,226,.92); text-shadow: 0 1px 6px rgba(0,0,0,.55); }
.site-header:not(.scrolled) .main-nav a:hover { color: #fff; }
.main-nav a:hover, .main-nav a.active { color: var(--red); }
.site-header:not(.scrolled) .main-nav a.active { color: var(--gold-light); }

.nav-toggle { display: none; width: 42px; height: 42px; flex-direction: column; justify-content: center; gap: 6px; align-items: center; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: currentColor; transition: .3s; border-radius: 2px; }
.nav-toggle.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ---------- 通用板块 ---------- */
.section { padding: 104px 0; position: relative; z-index: 1; }

.section-head { text-align: center; margin-bottom: 60px; }
.section-en {
  font-size: 12px;
  letter-spacing: 5px;
  color: var(--gold);
  font-weight: 500;
  margin-bottom: 14px;
}
.section-title {
  font-family: var(--serif);
  font-size: clamp(30px, 4vw, 42px);
  font-weight: 700;
  letter-spacing: 8px;
  display: inline-flex;
  align-items: center;
  gap: 20px;
  color: var(--ink);
}
.title-seal {
  display: inline-grid;
  place-items: center;
  width: 44px; height: 44px;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0;
  color: #f6ead2;
  background: linear-gradient(145deg, #a01818, var(--red-deep));
  border-radius: 7px;
  transform: rotate(-4deg);
  box-shadow: 0 4px 10px rgba(139,0,0,.28), inset 0 0 0 1px rgba(246,234,210,.3);
}
.section-desc {
  margin-top: 16px;
  color: var(--ink-soft);
  font-size: 16px;
  letter-spacing: 2px;
}
.section-head.light .section-title { color: #f2ead8; }
.section-head.light .section-desc { color: rgba(242,234,216,.72); }
.section-head.light .section-en { color: var(--gold-light); }

.sub-title {
  text-align: center;
  font-family: var(--serif);
  font-size: 24px;
  letter-spacing: 10px;
  margin: 80px 0 44px;
  color: var(--red-deep);
}
.sub-title span {
  position: relative;
  padding: 0 34px;
}
.sub-title span::before, .sub-title span::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 90px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold));
}
.sub-title span::before { right: 100%; }
.sub-title span::after { left: 100%; background: linear-gradient(90deg, var(--gold), transparent); }

.section-lead {
  max-width: 820px;
  margin: -28px auto 46px;
  text-align: center;
  color: var(--ink-soft);
}

p.lead { font-size: 17px; }
p.lead strong { color: var(--red-deep); font-weight: 700; }

/* ---------- 入场动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(34px);
  transition: opacity .9s cubic-bezier(.22,1,.36,1), transform .9s cubic-bezier(.22,1,.36,1);
  will-change: opacity, transform;
}
.reveal.in { opacity: 1; transform: none; }

/* ---------- ① Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background: #3a2c20 url("../assets/images/hero-scene.svg") center/cover no-repeat;
  transform: scale(1.08);
  animation: kenburns 24s ease-in-out infinite alternate;
}
@keyframes kenburns {
  from { transform: scale(1.08) translateY(0); }
  to { transform: scale(1.2) translateY(-2.5%); }
}
.hero-mask {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 50% 38%, rgba(0,0,0,.15) 0%, rgba(0,0,0,.55) 100%),
    linear-gradient(180deg, rgba(20,10,5,.55) 0%, rgba(20,10,5,.25) 40%, rgba(30,10,8,.6) 100%);
}
.hero-watermark {
  position: absolute; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Ctext x='10' y='48' font-family='serif' font-size='46' fill='%23C5A258' opacity='0.04'%3E法%3C/text%3E%3Ctext x='120' y='130' font-family='serif' font-size='38' fill='%23C5A258' opacity='0.032'%3E律%3C/text%3E%3Ctext x='40' y='200' font-family='serif' font-size='30' fill='%23C5A258' opacity='0.032'%3E典%3C/text%3E%3C/svg%3E");
  mix-blend-mode: screen;
}
.hero-content {
  position: relative;
  z-index: 2;
  padding: 0 24px;
  max-width: 960px;
}
.hero-kicker {
  font-family: var(--serif);
  font-size: 15px;
  letter-spacing: 8px;
  color: var(--gold-light);
  margin-bottom: 26px;
}
.hero-title { color: #f7efdd; }
.hero-title-small {
  display: block;
  font-size: clamp(15px, 1.8vw, 19px);
  font-weight: 400;
  letter-spacing: 12px;
  color: rgba(247,239,221,.82);
  margin-bottom: 22px;
}
.hero-title-main {
  display: block;
  font-family: var(--serif);
  font-size: clamp(42px, 7.4vw, 88px);
  font-weight: 900;
  letter-spacing: 10px;
  text-indent: 10px;
  line-height: 1.18;
  background: linear-gradient(180deg, #fdf6e6 0%, #ecd9ac 55%, #c9a862 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 4px 18px rgba(0,0,0,.45));
}
.hero-sub {
  margin-top: 26px;
  font-family: var(--kai);
  font-size: clamp(18px, 2.4vw, 26px);
  letter-spacing: 5px;
  color: rgba(247,239,221,.9);
}
.hero-badges {
  margin-top: 34px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px 26px;
}
.hero-badges li {
  position: relative;
  font-size: 14px;
  letter-spacing: 2px;
  color: rgba(247,239,221,.88);
  padding-left: 18px;
}
.hero-badges li::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 7px; height: 7px;
  background: var(--gold);
  transform: translateY(-50%) rotate(45deg);
  box-shadow: 0 0 0 3px rgba(197,162,88,.22);
}
.hero-cta { margin-top: 46px; display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 14px 42px;
  font-size: 16px;
  letter-spacing: 4px;
  border-radius: 4px;
  transition: transform .35s cubic-bezier(.22,1,.36,1), box-shadow .35s, background .35s, color .35s;
  position: relative;
  overflow: hidden;
}
.btn-primary {
  background: linear-gradient(145deg, #a01818, var(--red-deep));
  color: #f8efdc;
  box-shadow: 0 8px 24px rgba(139,0,0,.4), inset 0 0 0 1px rgba(248,239,220,.25);
}
.btn-primary::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255,255,255,.28) 50%, transparent 70%);
  transform: translateX(-120%);
  transition: transform .7s ease;
}
.btn-primary:hover::before { transform: translateX(120%); }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 14px 32px rgba(139,0,0,.5); }
.btn-ghost {
  color: #f5ecd8;
  border: 1px solid rgba(245,236,216,.65);
  backdrop-filter: blur(4px);
}
.btn-ghost:hover { background: rgba(245,236,216,.12); border-color: var(--gold-light); transform: translateY(-3px); }

.scroll-hint {
  position: absolute;
  bottom: 30px; left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(247,239,221,.75);
  font-size: 11px;
  letter-spacing: 4px;
}
.scroll-hint-line { width: 1px; height: 46px; background: rgba(247,239,221,.25); position: relative; overflow: hidden; }
.scroll-hint-line i {
  position: absolute; top: -50%; left: 0;
  width: 100%; height: 50%;
  background: var(--gold-light);
  animation: scrollLine 2.2s ease-in-out infinite;
}
@keyframes scrollLine {
  0% { top: -50%; } 60%,100% { top: 120%; }
}
.hero-content .reveal { transition-delay: var(--d, 0s); }
.hero-content .reveal:nth-child(1) { --d: .1s; }
.hero-content .reveal:nth-child(2) { --d: .25s; }
.hero-content .reveal:nth-child(3) { --d: .45s; }
.hero-content .reveal:nth-child(4) { --d: .6s; }
.hero-content .reveal:nth-child(5) { --d: .75s; }

/* ---------- ② 故居简介 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 56px;
  align-items: start;
}
.about-text p { margin-bottom: 20px; color: var(--ink-soft); }
.about-text strong { color: var(--ink); font-weight: 700; }
.about-text .lead strong { color: var(--red-deep); }
.honor-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}
.honor-row span {
  font-size: 13px;
  letter-spacing: 1px;
  padding: 7px 16px;
  border: 1px solid rgba(197,162,88,.65);
  color: var(--red-deep);
  border-radius: 30px;
  background: rgba(197,162,88,.08);
  transition: background .3s, transform .3s;
}
.honor-row span:hover { background: rgba(197,162,88,.2); transform: translateY(-2px); }

.about-visual { position: relative; display: grid; gap: 22px; }
.frame-photo {
  position: relative;
  background: #fff;
  padding: 10px 10px 42px;
  box-shadow: var(--shadow);
  transition: transform .5s cubic-bezier(.22,1,.36,1), box-shadow .5s;
}
.frame-photo::after {
  content: "";
  position: absolute; inset: 4px;
  border: 1px solid rgba(197,162,88,.45);
  pointer-events: none;
  transition: border-color .4s;
}
.frame-photo img { width: 100%; height: 100%; object-fit: cover; filter: sepia(.06) saturate(.96); transition: filter .5s, transform .8s; }
.frame-photo:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.frame-photo:hover img { transform: scale(1.045); filter: none; }
.frame-photo figcaption {
  position: absolute;
  bottom: 12px; left: 0; right: 0;
  text-align: center;
  font-family: var(--serif);
  font-size: 14px;
  letter-spacing: 4px;
  color: var(--ink-soft);
}
.photo-tall { justify-self: end; width: 82%; aspect-ratio: 3/3.7; transform: rotate(2deg); }
.photo-wide { width: 76%; aspect-ratio: 4/3; transform: rotate(-2.5deg); }
.photo-wide:hover { transform: rotate(-1deg) translateY(-5px); }
.photo-tall:hover { transform: rotate(.8deg) translateY(-5px); }

.fact-strip {
  margin-top: 64px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border-top: 1px solid rgba(197,162,88,.5);
  border-bottom: 1px solid rgba(197,162,88,.5);
  background: linear-gradient(180deg, rgba(255,255,255,.45), rgba(255,255,255,.15));
}
.fact-strip li {
  text-align: center;
  padding: 30px 10px;
  position: relative;
}
.fact-strip li + li::before {
  content: "";
  position: absolute;
  left: 0; top: 26%; bottom: 26%;
  width: 1px;
  background: rgba(197,162,88,.35);
}
.fact-strip b {
  display: block;
  font-family: var(--serif);
  font-size: 40px;
  font-weight: 700;
  color: var(--red);
  line-height: 1.1;
}
.fact-strip span { font-size: 13.5px; color: var(--ink-mute); letter-spacing: 1px; }

/* ---------- ③ 人物 ---------- */
.section-person { background: linear-gradient(180deg, var(--paper) 0%, var(--paper-deep) 100%); }
.person-intro {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 56px;
  align-items: center;
}
.person-portrait {
  position: relative;
  padding: 12px;
  background: #fff;
  box-shadow: var(--shadow);
}
.person-portrait::before {
  content: "寄簃";
  position: absolute;
  right: -18px; bottom: 26px;
  width: 52px; height: 52px;
  display: grid; place-items: center;
  background: var(--red);
  color: #f6ead2;
  font-family: var(--serif);
  font-size: 17px;
  letter-spacing: 1px;
  border-radius: 6px;
  transform: rotate(6deg);
  box-shadow: 0 6px 16px rgba(139,0,0,.35);
  z-index: 2;
}
.person-portrait img { aspect-ratio: 4/4.4; object-fit: cover; filter: sepia(.12) contrast(1.02); }
.person-portrait figcaption {
  text-align: center;
  padding: 12px 6px 4px;
  font-size: 13px;
  color: var(--ink-mute);
  letter-spacing: 1.5px;
}
.person-lead p { color: var(--ink-soft); }
.person-lead .lead strong { color: var(--red-deep); }
.person-comment {
  margin-top: 28px;
  padding: 22px 26px;
  border-left: 3px solid var(--gold);
  background: rgba(255,255,255,.55);
  font-family: var(--kai);
  font-size: 17.5px;
  color: var(--ink);
  border-radius: 0 8px 8px 0;
}
.person-comment cite { display: block; margin-top: 8px; font-style: normal; font-size: 14px; color: var(--ink-mute); font-family: var(--sans); }

/* 时间轴 */
.timeline {
  position: relative;
  max-width: 960px;
  margin: 0 auto;
  padding: 10px 0;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 50%; top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, transparent, var(--gold) 6%, var(--gold) 94%, transparent);
  transform: translateX(-50%);
}
.tl-item {
  position: relative;
  width: 50%;
  padding: 0 44px 34px 0;
}
.tl-item:nth-child(even) { margin-left: 50%; padding: 0 0 34px 44px; }
.tl-dot {
  position: absolute;
  top: 6px; right: -9px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--gold);
  z-index: 2;
  transition: background .4s, box-shadow .4s, transform .4s;
}
.tl-item:nth-child(even) .tl-dot { left: -9px; right: auto; }
.tl-item:hover .tl-dot, .tl-item.in .tl-dot {
  background: var(--red);
  border-color: var(--red);
  box-shadow: 0 0 0 6px rgba(139,0,0,.12);
  transform: scale(1.12);
}
.tl-card {
  background: var(--paper-card);
  border: 1px solid rgba(197,162,88,.4);
  border-radius: 8px;
  padding: 16px 22px;
  box-shadow: 0 6px 20px rgba(80,50,20,.07);
  transition: transform .35s, box-shadow .35s, border-color .35s;
}
.tl-item:nth-child(odd) .tl-card { text-align: right; }
.tl-item:hover .tl-card { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--gold); }
.tl-card time {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 23px;
  color: var(--red);
  letter-spacing: 1px;
}
.tl-card p { font-size: 14.5px; color: var(--ink-soft); margin-top: 4px; line-height: 1.7; }

/* 成就卡片 */
.achievement-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}
.ach-card {
  background: var(--paper-card);
  border: 1px solid rgba(197,162,88,.38);
  border-radius: 10px;
  padding: 30px 22px 26px;
  text-align: center;
  transition: transform .4s cubic-bezier(.22,1,.36,1), box-shadow .4s, border-color .4s;
  position: relative;
  overflow: hidden;
}
.ach-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% -20%, rgba(197,162,88,.22), transparent 65%);
  opacity: 0;
  transition: opacity .45s;
}
.ach-card:hover { transform: translateY(-8px); box-shadow: var(--shadow); border-color: var(--gold); }
.ach-card:hover::before { opacity: 1; }
.ach-icon {
  width: 58px; height: 58px;
  margin: 0 auto 16px;
  display: grid; place-items: center;
  color: var(--red);
  border: 1.5px solid rgba(139,0,0,.25);
  border-radius: 50%;
  transition: transform .45s, background .45s, color .45s;
}
.ach-icon svg { width: 30px; height: 30px; }
.ach-card:hover .ach-icon { background: var(--red); color: var(--gold-pale); border-color: var(--red); transform: rotate(-6deg) scale(1.08); }
.ach-card h4 { font-family: var(--serif); font-size: 19px; letter-spacing: 3px; margin-bottom: 10px; }
.ach-card p { font-size: 13.5px; color: var(--ink-soft); line-height: 1.75; }

/* 名言 */
.quotes {
  margin-top: 70px;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  grid-auto-rows: 1fr;
  gap: 20px;
}
.quote-card {
  position: relative;
  padding: 30px 30px 26px;
  border-radius: 10px;
  background: linear-gradient(160deg, #fffdf8, #f6eedd);
  border: 1px solid rgba(197,162,88,.45);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform .4s, box-shadow .4s;
}
.quote-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.quote-card::before {
  content: "“";
  position: absolute;
  top: -6px; left: 12px;
  font-family: var(--serif);
  font-size: 76px;
  color: rgba(139,0,0,.16);
  line-height: 1;
}
.quote-card blockquote {
  font-family: var(--kai);
  font-size: 17px;
  color: var(--ink);
  position: relative;
  z-index: 1;
}
.quote-card figcaption { margin-top: 14px; font-size: 13px; color: var(--ink-mute); }
.quote-feature {
  grid-row: span 2;
  background: linear-gradient(160deg, var(--red-deep), var(--red-dark));
  border-color: var(--red-dark);
}
.quote-feature::before { color: rgba(221,194,133,.25); font-size: 110px; }
.quote-feature blockquote {
  font-size: 25px;
  line-height: 2;
  letter-spacing: 3px;
  color: #f4e7ca;
  margin: auto 0;
}
.quote-feature figcaption { color: var(--gold-light); font-size: 14px; letter-spacing: 2px; }

/* ---------- ④ 展览 ---------- */
.section-exhibition { background: var(--paper); }
.exh-grid-wrap { position: relative; }
.exh-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  list-style: none;
  margin: 0;
  padding: 12px 4px 4px;
}
.exh-card {
  background: var(--paper-card);
  border: 1px solid rgba(197,162,88,.4);
  border-top: 3px solid var(--red);
  border-radius: 10px;
  padding: 32px 28px;
  transition: transform .4s cubic-bezier(.22,1,.36,1), box-shadow .4s;
  user-select: none;
}
.exh-card:hover { transform: translateY(-8px); box-shadow: var(--shadow); }
.exh-no {
  display: inline-block;
  font-family: var(--serif);
  font-size: 14px;
  letter-spacing: 3px;
  color: #f6ead2;
  background: var(--red);
  padding: 4px 14px;
  border-radius: 4px;
  margin-bottom: 18px;
}
.exh-card h3 { font-family: var(--serif); font-size: 21px; letter-spacing: 2px; margin-bottom: 8px; }
.exh-loc { font-size: 12.5px; color: var(--gold); margin-bottom: 12px; letter-spacing: 1px; }
.exh-loc::before { content: "◆ "; }
.exh-card p:last-child { font-size: 14px; color: var(--ink-soft); }

.exh-tip {
  margin-top: 44px;
  display: flex;
  align-items: center;
  gap: 18px;
  background: linear-gradient(100deg, rgba(139,0,0,.07), rgba(197,162,88,.1));
  border: 1px dashed rgba(139,0,0,.35);
  border-radius: 10px;
  padding: 20px 28px;
}
.exh-tip-seal {
  flex: none;
  width: 46px; height: 46px;
  display: grid; place-items: center;
  background: var(--red);
  color: var(--gold-pale);
  font-family: var(--serif);
  font-size: 22px;
  border-radius: 7px;
  transform: rotate(-5deg);
}
.exh-tip p { font-size: 15px; color: var(--ink-soft); }
.exh-tip strong { color: var(--red-deep); }

/* ---------- ⑤ 活动 ---------- */
.section-activities {
  background:
    radial-gradient(circle at 85% 8%, rgba(197,162,88,.12), transparent 40%),
    linear-gradient(180deg, var(--paper-deep), var(--paper) 60%);
}
.act-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.act-card {
  position: relative;
  background: var(--paper-card);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(197,162,88,.35);
  box-shadow: 0 8px 26px rgba(70,45,15,.08);
  cursor: pointer;
  outline: none;
  transition: transform .45s cubic-bezier(.22,1,.36,1), box-shadow .45s, border-color .45s;
  transform-style: preserve-3d;
}
.act-card:hover, .act-card:focus-visible {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--gold);
}
.act-feature { grid-column: span 3; display: grid; grid-template-columns: 1.25fr 1fr; min-height: 340px; }
.act-img { position: relative; overflow: hidden; aspect-ratio: 4/3; }
.act-feature .act-img { aspect-ratio: auto; height: 100%; }
.act-img::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(0,0,0,.28));
  opacity: .6;
  transition: opacity .4s;
}
.act-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .9s cubic-bezier(.22,1,.36,1);
}
.act-card:hover .act-img img { transform: scale(1.07); }
.act-body { padding: 24px 26px 26px; display: flex; flex-direction: column; }
.act-feature .act-body { justify-content: center; padding: 36px 42px; }
.act-tag {
  align-self: flex-start;
  font-size: 13.5px;
  letter-spacing: 1.5px;
  color: var(--red-deep);
  background: rgba(197,162,88,.18);
  border: 1px solid rgba(197,162,88,.5);
  padding: 5px 14px;
  border-radius: 20px;
  margin-bottom: 14px;
}
.act-body h3 { font-family: var(--serif); font-size: 24px; letter-spacing: 2px; margin-bottom: 10px; }
.act-feature .act-body h3 { font-size: 34px; letter-spacing: 4px; }
.act-highlight { font-size: 15.5px; color: var(--ink-soft); flex: 1; }
.act-feature .act-highlight { font-size: 17.5px; margin: 8px 0 18px; }
.act-more {
  margin-top: 16px;
  font-size: 13.5px;
  letter-spacing: 2px;
  color: var(--red);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.act-more i { font-style: normal; transition: transform .35s; }
.act-card:hover .act-more i { transform: translateX(7px); }

/* 弹层 */
.modal-layer {
  position: fixed; inset: 0;
  z-index: 1200;
  display: grid;
  place-items: center;
  padding: 24px;
  visibility: hidden;
  opacity: 0;
  transition: opacity .35s, visibility .35s;
}
.modal-layer.open { visibility: visible; opacity: 1; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(25,15,8,.62); backdrop-filter: blur(6px); }
.modal-box {
  position: relative;
  width: min(620px, 100%);
  max-height: 84vh;
  overflow-y: auto;
  background: var(--paper-card);
  border-radius: 14px;
  border: 1px solid rgba(197,162,88,.5);
  box-shadow: 0 30px 80px rgba(0,0,0,.4);
  padding: 42px 44px 38px;
  transform: translateY(30px) scale(.97);
  transition: transform .4s cubic-bezier(.22,1,.36,1);
}
.modal-layer.open .modal-box { transform: none; }
.modal-box::before {
  content: "";
  position: absolute; inset: 10px;
  border: 1px solid rgba(197,162,88,.35);
  border-radius: 8px;
  pointer-events: none;
}
.modal-close {
  position: absolute;
  top: 14px; right: 16px;
  width: 40px; height: 40px;
  font-size: 26px;
  line-height: 1;
  color: var(--ink-mute);
  border-radius: 50%;
  transition: background .3s, color .3s, transform .3s;
  z-index: 2;
}
.modal-close:hover { background: rgba(139,0,0,.1); color: var(--red); transform: rotate(90deg); }
.modal-content > .act-tag { margin-bottom: 16px; }
.modal-content h3 { font-family: var(--serif); font-size: 27px; letter-spacing: 3px; color: var(--red-deep); margin-bottom: 20px; }
.modal-content p { color: var(--ink-soft); margin-bottom: 14px; font-size: 15.5px; }
.modal-meta { margin-bottom: 20px; border-top: 1px solid rgba(197,162,88,.4); border-bottom: 1px solid rgba(197,162,88,.4); }
.modal-meta li { display: flex; gap: 14px; padding: 11px 0; font-size: 14.5px; color: var(--ink-soft); border-bottom: 1px dashed rgba(197,162,88,.3); }
.modal-meta li:last-child { border-bottom: none; }
.modal-meta b {
  flex: none;
  width: 48px;
  color: var(--red-deep);
  font-family: var(--serif);
  letter-spacing: 2px;
}

/* ---------- ⑥ 数字文博 ---------- */
.section-digital {
  background: linear-gradient(180deg, var(--indigo-darker), var(--indigo-deep) 55%, var(--indigo-darker));
  color: rgba(242,234,216,.85);
  overflow: hidden;
}
.digital-particles { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; }

.ai-feature {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 54px;
  align-items: center;
  margin-bottom: 70px;
}
.ai-visual { position: relative; display: grid; gap: 18px; }
.ai-seal-photo {
  position: relative;
  width: 88%;
  justify-self: end;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(197,162,88,.5);
  box-shadow: 0 18px 50px rgba(0,0,0,.45);
  transform: rotate(2.5deg);
  transition: transform .5s;
  z-index: 2;
}
.ai-seal-photo:hover { transform: rotate(0) scale(1.03); }
.ai-seal-photo img { aspect-ratio: 8/5; object-fit: cover; }
.ai-seal-photo figcaption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 26px 14px 10px;
  background: linear-gradient(transparent, rgba(0,0,0,.78));
  font-size: 13px;
  letter-spacing: 2px;
  color: #f0e4cc;
  text-align: center;
}
.ai-chat-photo {
  width: 86%;
  justify-self: start;
  margin-top: -26px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(120,170,220,.4);
  box-shadow: 0 18px 50px rgba(0,0,0,.4);
  transform: rotate(-2.5deg);
  transition: transform .5s;
}
.ai-chat-photo:hover { transform: rotate(0) scale(1.03); }
.ai-chat-photo img { aspect-ratio: 8/5; object-fit: cover; }

.ai-badge {
  display: inline-block;
  font-size: 12.5px;
  letter-spacing: 3px;
  color: var(--gold-light);
  border: 1px solid rgba(197,162,88,.6);
  padding: 5px 16px;
  border-radius: 20px;
  margin-bottom: 18px;
}
.ai-copy h3 {
  font-family: var(--serif);
  font-size: clamp(25px, 3vw, 33px);
  letter-spacing: 3px;
  color: #f4ead5;
  margin-bottom: 18px;
}
.ai-copy p { color: rgba(242,234,216,.78); margin-bottom: 18px; }
.ai-list { display: grid; gap: 10px; margin-bottom: 26px; }
.ai-list li {
  position: relative;
  padding-left: 26px;
  color: rgba(242,234,216,.82);
  font-size: 15px;
}
.ai-list li::before {
  content: "";
  position: absolute;
  left: 2px; top: .62em;
  width: 9px; height: 9px;
  border: 1.5px solid var(--gold-light);
  transform: rotate(45deg);
}
.nfc-row {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(197,162,88,.3);
  border-radius: 10px;
  padding: 20px 22px;
  margin-bottom: 18px;
}
.nfc-icon {
  flex: none;
  width: 46px; height: 46px;
  display: grid; place-items: center;
  color: var(--gold-light);
  border: 1px solid rgba(197,162,88,.5);
  border-radius: 10px;
  animation: nfcPulse 2.6s ease-in-out infinite;
}
.nfc-icon svg { width: 26px; height: 26px; }
@keyframes nfcPulse {
  0%,100% { box-shadow: 0 0 0 0 rgba(197,162,88,.35); }
  50% { box-shadow: 0 0 0 10px rgba(197,162,88,0); }
}
.nfc-row p { margin: 0; font-size: 14.5px; }
.nfc-row strong { color: var(--gold-light); font-weight: 700; }
.ai-vision { font-size: 13.5px; color: rgba(242,234,216,.55); }
.ai-vision em { font-style: normal; color: rgba(197,162,88,.85); }

/* 对话演示 */
.chat-stage {
  position: relative;
  width: min(980px, 92vw);
  margin: 0 auto 70px;
  display: flex;
  justify-content: center;
}
.chat-demo {
  position: relative;
  width: 760px;
  max-width: 100%;
  margin-right: 150px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(120,170,220,.3);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,.35);
  backdrop-filter: blur(8px);
}
.chat-avatar {
  width: 34px; height: 34px;
  border-radius: 50%;
  object-fit: cover;
  border: 1.5px solid rgba(197,162,88,.7);
  background: rgba(245,240,232,.92);
  box-shadow: 0 2px 8px rgba(0,0,0,.35);
}
.chat-mascot {
  position: absolute;
  right: -14px;
  bottom: -4px;
  width: 190px;
  z-index: 3;
  pointer-events: none;
  filter: drop-shadow(0 18px 28px rgba(0,0,0,.45));
  animation: mascotFloat 5.5s ease-in-out infinite;
}
@keyframes mascotFloat {
  0%, 100% { transform: translateY(0) rotate(-1.5deg); }
  50% { transform: translateY(-10px) rotate(1.5deg); }
}
.chat-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  background: rgba(0,0,0,.25);
  border-bottom: 1px solid rgba(120,170,220,.22);
}
.chat-head strong { font-family: var(--serif); letter-spacing: 3px; color: #f0e4cc; }
.chat-head em { font-style: normal; font-size: 11.5px; color: rgba(242,234,216,.45); margin-left: auto; letter-spacing: 1px; }
.chat-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #5fd39a;
  box-shadow: 0 0 0 4px rgba(95,211,154,.18);
  animation: blink 2s infinite;
}
@keyframes blink { 50% { opacity: .35; } }
.chat-window { padding: 24px 22px; display: grid; gap: 14px; min-height: 130px; max-height: 320px; overflow-y: auto; }
.bubble {
  max-width: 86%;
  padding: 13px 18px;
  border-radius: 14px;
  font-size: 15px;
  line-height: 1.8;
  animation: bubbleIn .5s cubic-bezier(.22,1,.36,1);
}
@keyframes bubbleIn { from { opacity: 0; transform: translateY(14px); } }
.bubble.bot {
  justify-self: start;
  background: rgba(245,240,232,.12);
  border: 1px solid rgba(197,162,88,.3);
  color: #f2eadb;
  border-bottom-left-radius: 4px;
}
.bubble.user {
  justify-self: end;
  background: linear-gradient(145deg, #a01818, var(--red-deep));
  color: #f8efdc;
  border-bottom-right-radius: 4px;
}
.bubble.typing::after {
  content: "▍";
  color: var(--gold-light);
  animation: caret 1s steps(1) infinite;
}
@keyframes caret { 50% { opacity: 0; } }
.chat-questions { display: flex; flex-wrap: wrap; gap: 10px; padding: 0 22px 22px; }
.chat-questions button {
  font-size: 13.5px;
  padding: 9px 18px;
  border-radius: 30px;
  border: 1px solid rgba(197,162,88,.55);
  color: var(--gold-light);
  background: rgba(197,162,88,.08);
  transition: background .3s, transform .3s, opacity .3s;
}
.chat-questions button:hover:not(:disabled) { background: rgba(197,162,88,.22); transform: translateY(-2px); }
.chat-questions button:disabled { opacity: .35; cursor: default; }

/* 数字矩阵 */
.digital-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  margin-bottom: 30px;
}
.digi-card {
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(120,170,220,.25);
  border-radius: 12px;
  padding: 30px 24px;
  transition: transform .4s, border-color .4s, background .4s;
}
.digi-card:hover { transform: translateY(-7px); border-color: var(--gold); background: rgba(255,255,255,.08); }
.digi-icon {
  width: 52px; height: 52px;
  display: grid; place-items: center;
  color: var(--gold-light);
  border: 1px solid rgba(197,162,88,.5);
  border-radius: 12px;
  margin-bottom: 18px;
  transition: transform .45s;
}
.digi-icon svg { width: 28px; height: 28px; }
.digi-card:hover .digi-icon { transform: rotate(-6deg) scale(1.08); }
.digi-card h4 { font-family: var(--serif); font-size: 19px; letter-spacing: 3px; color: #f0e4cc; margin-bottom: 10px; }
.digi-card p { font-size: 13.5px; color: rgba(242,234,216,.62); }

/* ---------- ⑦ 参观信息 ---------- */
.section-visit { background: var(--paper); }
.visit-layout {
  display: grid;
  grid-template-columns: 1.55fr 1fr;
  gap: 32px;
  align-items: start;
}
.info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}
.info-card {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--paper-card);
  border: 1px solid rgba(197,162,88,.35);
  border-radius: 10px;
  padding: 22px 22px;
  transition: transform .35s, box-shadow .35s, border-color .35s;
}
.info-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: var(--gold); }
.info-card.highlight { background: linear-gradient(150deg, var(--red-deep), var(--red-dark)); border-color: var(--red-dark); }
.info-card.highlight h3, .info-card.highlight p, .info-card.highlight .info-icon { color: #f4e7ca; }
.info-card.highlight .free { font-size: 22px; font-family: var(--serif); letter-spacing: 4px; }
.info-icon { flex: none; width: 42px; height: 42px; color: var(--red); }
.info-icon svg { width: 100%; height: 100%; }
.info-card h3 { font-family: var(--serif); font-size: 17px; letter-spacing: 3px; margin-bottom: 6px; white-space: nowrap; }
.info-card p { font-size: 14px; color: var(--ink-soft); line-height: 1.75; }
.info-card small { color: var(--ink-mute); }
.info-card.highlight small { color: rgba(244,231,202,.65); }
.info-card strong { color: var(--red-deep); }
.info-card.highlight strong { color: var(--gold-light); }
.tel a { font-family: var(--serif); font-size: 16px; color: var(--red-deep); font-weight: 700; transition: opacity .3s; }
.tel a:hover { opacity: .65; }
.info-card.highlight .tel a { color: var(--gold-light); }

.traffic-card {
  background: var(--paper-card);
  border: 1px solid rgba(197,162,88,.4);
  border-radius: 12px;
  padding: 26px 26px 22px;
  box-shadow: 0 8px 26px rgba(70,45,15,.07);
  position: sticky;
  top: 96px;
}
.traffic-card h3 { font-family: var(--serif); font-size: 20px; letter-spacing: 3px; margin-bottom: 16px; color: var(--red-deep); }
.mini-map { border-radius: 8px; overflow: hidden; border: 1px solid rgba(197,162,88,.35); margin-bottom: 18px; }
.mini-map img { display: block; width: 100%; height: auto; }
.traffic-list { display: grid; gap: 10px; }
.traffic-list li { font-size: 13.5px; color: var(--ink-soft); padding-left: 4px; }
.traffic-list b {
  display: inline-block;
  min-width: 42px;
  color: var(--red-deep);
  font-family: var(--serif);
  letter-spacing: 2px;
}

/* FAQ */
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-list details {
  background: var(--paper-card);
  border: 1px solid rgba(197,162,88,.35);
  border-radius: 10px;
  margin-bottom: 14px;
  overflow: hidden;
  transition: box-shadow .3s, border-color .3s;
}
.faq-list details[open] { border-color: var(--gold); box-shadow: 0 8px 24px rgba(70,45,15,.08); }
.faq-list summary {
  list-style: none;
  cursor: pointer;
  padding: 20px 56px 20px 26px;
  font-family: var(--serif);
  font-size: 17px;
  letter-spacing: 1.5px;
  position: relative;
  transition: color .3s;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list details[open] summary { color: var(--red-deep); }
.faq-arrow {
  position: absolute;
  right: 24px; top: 50%;
  width: 10px; height: 10px;
  border-right: 2px solid var(--gold);
  border-bottom: 2px solid var(--gold);
  transform: translateY(-65%) rotate(45deg);
  transition: transform .35s;
}
.faq-list details[open] .faq-arrow { transform: translateY(-30%) rotate(-135deg); }
.faq-list details p {
  padding: 0 26px 22px;
  color: var(--ink-soft);
  font-size: 15px;
  animation: faqIn .4s ease;
}
@keyframes faqIn { from { opacity: 0; transform: translateY(-6px); } }
.faq-list strong { color: var(--red-deep); }

/* ---------- ⑧ 页脚 ---------- */
.site-footer {
  background:
    radial-gradient(circle at 50% 0%, rgba(197,162,88,.12), transparent 55%),
    linear-gradient(180deg, #241513, #180d0b);
  color: rgba(242,234,216,.78);
  padding: 70px 0 0;
  position: relative;
  z-index: 1;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
  padding-bottom: 50px;
}
.footer-brand { display: flex; gap: 20px; align-items: center; }
.footer-brand h2 { font-family: var(--serif); font-size: 26px; letter-spacing: 5px; color: #f4ead5; margin-bottom: 8px; }
.footer-brand p { font-size: 14px; color: rgba(242,234,216,.6); }
.footer-tel { margin-top: 6px; color: rgba(197,162,88,.9) !important; letter-spacing: 1px; }
.footer-qrs { display: flex; gap: 30px; }
.qr-item { text-align: center; }
.qr-ph {
  display: block;
  width: 92px; height: 92px;
  padding: 7px;
  background: #fff;
  border-radius: 8px;
  transition: transform .35s, box-shadow .35s;
}
.qr-ph svg { width: 100%; height: 100%; }
.qr-item:hover .qr-ph { transform: translateY(-5px); box-shadow: 0 10px 24px rgba(0,0,0,.4); }
.qr-item p { margin-top: 9px; font-size: 12.5px; letter-spacing: 1.5px; color: rgba(242,234,216,.65); }
.footer-meta {
  border-top: 1px solid rgba(197,162,88,.18);
  padding: 26px 28px 30px;
  text-align: center;
  font-size: 13px;
  color: rgba(242,234,216,.5);
  line-height: 2.1;
}
.footer-meta a { color: rgba(242,234,216,.55); transition: color .3s; }
.footer-meta a:hover { color: var(--gold-light); }
.footer-identity { color: rgba(242,234,216,.4); font-size: 12.5px; }

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 28px; bottom: 30px;
  width: 52px; height: 52px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity .4s, visibility .4s, transform .4s, background .4s;
  z-index: 900;
}
.back-top.show { opacity: 1; visibility: visible; transform: none; }
.back-top svg { position: absolute; inset: 0; transform: rotate(-90deg); }
.bt-track { fill: rgba(139,0,0,.08); stroke: none; }
.bt-fill {
  fill: none;
  stroke: var(--red);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 125.66;
  stroke-dashoffset: 125.66;
  transition: stroke-dashoffset .15s linear;
}
.back-top .bt-arrow {
  position: relative;
  font-size: 18px;
  color: var(--red);
  transition: transform .3s;
}
.back-top:hover .bt-arrow { transform: translateY(-3px); }
.back-top:hover { background: rgba(255,255,255,.5); }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .chat-mascot { display: none; }
  .chat-stage .chat-demo { margin-right: 0; }
  .about-grid { grid-template-columns: 1fr; gap: 44px; }
  .about-visual { grid-template-columns: 1fr 1fr; max-width: 620px; }
  .photo-tall, .photo-wide { width: 100%; justify-self: stretch; }
  .achievement-grid { grid-template-columns: repeat(3, 1fr); }
  .exh-grid { grid-template-columns: repeat(2, 1fr); }
  .act-grid { grid-template-columns: repeat(2, 1fr); }
  .act-feature { grid-column: span 2; }
  .digital-grid { grid-template-columns: repeat(2, 1fr); }
  .person-intro { grid-template-columns: 280px 1fr; gap: 36px; }
}

@media (max-width: 860px) {
  .main-nav {
    position: absolute;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(245,240,232,.98);
    backdrop-filter: blur(14px);
    padding: 8px 0 14px;
    box-shadow: 0 18px 30px rgba(60,30,10,.14);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: .35s;
  }
  .main-nav.open { transform: none; opacity: 1; visibility: visible; }
  .main-nav a { color: var(--ink) !important; text-shadow: none !important; padding: 14px 32px; }
  .main-nav a::after { display: none; }
  .main-nav a.active { color: var(--red) !important; background: rgba(139,0,0,.06); }
  .nav-toggle { display: flex; }
  .site-header:not(.scrolled) .nav-toggle { color: #f3ead7; }
  .site-header.scrolled .nav-toggle { color: var(--ink); }

  .visit-layout { grid-template-columns: 1fr; }
  .traffic-card { position: static; }
  .person-intro { grid-template-columns: 1fr; justify-items: center; text-align: left; }
  .person-portrait { width: min(320px, 80%); }
  .quotes { grid-template-columns: 1fr 1fr; }
  .quote-feature { grid-column: span 2; grid-row: auto; }
  .ai-feature { grid-template-columns: 1fr; gap: 36px; }
  .ai-seal-photo, .ai-chat-photo { width: min(320px, 70%); }
}

@media (max-width: 640px) {
  body { font-size: 15px; }
  .container { padding: 0 18px; }
  .header-inner { padding: 0 18px; height: 64px; }
  :root { --header-h: 64px; }
  .section { padding: 72px 0; }
  .section-head { margin-bottom: 42px; }
  .section-title { letter-spacing: 5px; gap: 12px; }
  .hero-title-main { letter-spacing: 6px; text-indent: 6px; }
  .hero-kicker { letter-spacing: 5px; }
  .fact-strip { grid-template-columns: repeat(2, 1fr); }
  .fact-strip li + li::before { display: none; }
  .achievement-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .ach-card { padding: 24px 14px 20px; }
  .act-grid { grid-template-columns: 1fr; }
  .act-feature { grid-column: auto; grid-template-columns: 1fr; min-height: 0; }
  .act-feature .act-img { aspect-ratio: 4/3; height: auto; }
  .act-feature .act-body { padding: 26px 24px; }
  .act-feature .act-body h3 { font-size: 24px; }
  .info-grid { grid-template-columns: 1fr; }
  .digital-grid { grid-template-columns: 1fr; }
  .quotes { grid-template-columns: 1fr; }
  .quote-feature { grid-column: auto; }
  .quote-feature blockquote { font-size: 20px; }
  .exh-grid { grid-template-columns: 1fr; }
  .modal-box { padding: 38px 24px 28px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .footer-qrs { width: 100%; justify-content: space-around; gap: 12px; }
  .qr-ph { width: 74px; height: 74px; }
  .back-top { right: 16px; bottom: 18px; }

  /* 时间轴移动端单列 */
  .timeline::before { left: 9px; }
  .tl-item, .tl-item:nth-child(even) { width: 100%; margin-left: 0; padding: 0 0 26px 38px; }
  .tl-dot, .tl-item:nth-child(even) .tl-dot { left: 0; right: auto; }
  .tl-item:nth-child(odd) .tl-card { text-align: left; }

  .about-visual { grid-template-columns: 1fr; }
  .sub-title { letter-spacing: 6px; margin: 56px 0 32px; }
  .sub-title span::before, .sub-title span::after { width: 36px; }
  .hero-badges { gap: 8px 18px; }
}

/* ---------- 降低动态偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
  .hero-bg { animation: none; transform: scale(1.08); }
}