/* ===================================================================
   敦煌艺术与丝路文明 · 数字课程门户
   视觉规范：暗金 #c9a44c / 石青 #2c6e8f / 赭石 #9c5a3c · 暖墨底 #14100c
   字体：Noto Serif SC(标题) / Noto Sans SC(正文) · 描金标题 · 丝滑过渡
   =================================================================== */

:root{
  /* 主视觉色 */
  --ink:#14100c;            /* 暖墨底 */
  --ink-2:#1d1610;          /* 卡片底 */
  --ink-3:#261c12;          /* 描边/分隔 */
  --gold:#c9a44c;           /* 暗金 */
  --gold-br:#e8c879;        /* 描金亮 */
  --gold-dim:#8a7330;
  --azur:#2c6e8f;           /* 石青 */
  --azur-deep:#15435c;
  --azur-br:#4ea3c4;
  --ochre:#9c5a3c;          /* 赭石 */
  --ochre-br:#c08560;
  --ochre-deep:#6b3a26;
  --paper:#efe6d2;          /* 卷轴纸色（亮底文字） */
  --parch:#e8dcc0;          /* 正文暖白 */
  --parch-dim:#b8ad94;      /* 次要文字 */
  --vermilion:#a83a2c;      /* 朱砂点缀 */

  /* 字体 */
  --f-serif:"Noto Serif SC","Source Han Serif SC",serif;
  --f-sans:"Noto Sans SC","Source Han Sans SC",sans-serif;

  /* 尺度 */
  --nav-h:72px;
  --maxw:1240px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --ease-soft:cubic-bezier(.4,.0,.2,1);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body{
  font-family:var(--f-sans);
  background:var(--ink);
  color:var(--parch);
  line-height:1.85;
  overflow-x:hidden;
  background-image:
    radial-gradient(1200px 600px at 80% -10%, rgba(201,164,76,.06), transparent 60%),
    radial-gradient(900px 500px at 0% 110%, rgba(44,110,143,.07), transparent 60%);
}
/* 颗粒噪点叠层，模拟壁画肌理 */
body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:9999;opacity:.045;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode:overlay;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
::selection{background:var(--gold);color:var(--ink)}

/* ---------- 描金标题 ---------- */
.gilt{
  font-family:var(--f-serif);
  font-weight:700;
  background:linear-gradient(180deg,#f3e0a6 0%,#d4af6a 45%,#a87f2e 100%);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
  letter-spacing:.04em;
}
.gilt-stroke{
  position:relative;
  -webkit-text-stroke:0;
  filter:drop-shadow(0 1px 0 rgba(0,0,0,.5));
}

/* ---------- 顶部导航 ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:1000;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 clamp(16px,4vw,48px);
  background:linear-gradient(180deg,rgba(20,16,12,.92),rgba(20,16,12,.55) 70%,transparent);
  backdrop-filter:blur(10px);
  transition:background .5s var(--ease);
}
.nav.scrolled{background:rgba(20,16,12,.96);border-bottom:1px solid rgba(201,164,76,.18)}
.nav__brand{display:flex;align-items:center;gap:12px;font-family:var(--f-serif)}
.nav__seal{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;
  background:radial-gradient(circle at 30% 30%,var(--ochre-br),var(--ochre) 70%);
  box-shadow:0 0 0 1px rgba(232,200,121,.4),0 2px 12px rgba(0,0,0,.5);
  font-size:18px;color:var(--paper)}
.nav__brand b{font-size:18px;letter-spacing:.08em;color:var(--gold-br)}
.nav__brand small{display:block;font-family:var(--f-sans);font-size:10px;color:var(--parch-dim);letter-spacing:.3em}
.nav__links{display:flex;gap:clamp(8px,1.6vw,28px);align-items:center}
.nav__links a{font-size:14px;color:var(--parch);opacity:.82;position:relative;padding:6px 2px;transition:.3s var(--ease)}
.nav__links a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:1px;background:var(--gold);transition:width .35s var(--ease)}
.nav__links a:hover,.nav__links a.active{opacity:1;color:var(--gold-br)}
.nav__links a:hover::after,.nav__links a.active::after{width:100%}
.nav__toggle{display:none;font-size:22px;color:var(--gold-br)}

/* 移动端 */
@media(max-width:860px){
  .nav__links{position:fixed;inset:var(--nav-h) 0 auto 0;background:rgba(20,16,12,.98);
    flex-direction:column;padding:18px 0;gap:6px;transform:translateY(-120%);transition:.4s var(--ease);border-top:1px solid rgba(201,164,76,.15)}
  .nav__links.open{transform:translateY(0)}
  .nav__links a{font-size:16px;padding:10px 24px;width:100%}
  .nav__toggle{display:block}
}

/* ---------- 通用容器 ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(18px,5vw,40px)}
.section{padding:clamp(64px,9vw,120px) 0;position:relative}
.eyebrow{font-size:12px;letter-spacing:.4em;color:var(--ochre-br);text-transform:uppercase;margin-bottom:14px}
.h2{font-family:var(--f-serif);font-size:clamp(28px,4vw,46px);line-height:1.25;font-weight:700}
.lead{font-size:clamp(15px,1.5vw,17px);color:var(--parch-dim);max-width:62ch}
.gold-line{width:54px;height:2px;background:linear-gradient(90deg,var(--gold),transparent);margin:18px 0}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;gap:10px;font-size:14px;letter-spacing:.1em;
  padding:13px 26px;border:1px solid var(--gold-dim);color:var(--gold-br);position:relative;
  transition:.35s var(--ease);overflow:hidden;background:transparent}
.btn::before{content:"";position:absolute;inset:0;background:var(--gold);transform:scaleX(0);transform-origin:left;transition:transform .4s var(--ease);z-index:-1}
.btn:hover{color:var(--ink);border-color:var(--gold)}
.btn:hover::before{transform:scaleX(1)}
.btn--solid{background:var(--gold);color:var(--ink);border-color:var(--gold)}
.btn--solid::before{background:var(--gold-br)}

/* ---------- 装饰：云纹分割 ---------- */
.cloud-div{height:60px;display:flex;align-items:center;justify-content:center;gap:18px;color:var(--gold-dim)}
.cloud-div::before,.cloud-div::after{content:"";height:1px;flex:1;max-width:120px;background:linear-gradient(90deg,transparent,var(--gold-dim),transparent)}
.cloud-div svg{width:26px;opacity:.7}

/* ---------- 页脚 ---------- */
.footer{background:var(--ink-2);border-top:1px solid rgba(201,164,76,.14);padding:56px 0 40px;color:var(--parch-dim);font-size:13px}
.footer__top{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px;margin-bottom:36px}
@media(max-width:860px){.footer__top{grid-template-columns:1fr 1fr}}
.footer h4{font-family:var(--f-serif);color:var(--gold-br);font-size:15px;margin-bottom:14px;font-weight:700}
.footer a{display:block;padding:3px 0;opacity:.8;transition:.3s}
.footer a:hover{color:var(--gold-br);opacity:1;padding-left:4px}
.footer__bottom{border-top:1px solid rgba(201,164,76,.1);padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:12px}

/* ---------- 渐入动画 ---------- */
.reveal{opacity:0;transform:translateY(34px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal[data-d="1"]{transition-delay:.1s}.reveal[data-d="2"]{transition-delay:.2s}.reveal[data-d="3"]{transition-delay:.3s}
.reveal[data-d="4"]{transition-delay:.4s}.reveal[data-d="5"]{transition-delay:.5s}

@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}

/* ===================================================================
   首页 · 全屏视差开场
   =================================================================== */
.hero{position:relative;height:100vh;min-height:640px;overflow:hidden;isolation:isolate}
.hero__bg{position:absolute;inset:-8% 0;background-size:cover;background-position:center;
  will-change:transform;transform:scale(1.12);transition:none}
.hero__bg::after{content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(20,16,12,.35) 0%,rgba(20,16,12,.25) 40%,rgba(20,16,12,.7) 78%,var(--ink) 100%)}
.hero__inner{position:relative;z-index:2;height:100%;display:flex;flex-direction:column;
  justify-content:center;align-items:center;text-align:center;padding:0 20px}
.hero__ttl{font-family:var(--f-serif);font-size:clamp(40px,8vw,108px);line-height:1.05;font-weight:900;
  letter-spacing:.06em;text-shadow:0 2px 30px rgba(0,0,0,.6)}
.hero__sub{font-family:var(--f-serif);font-size:clamp(16px,2vw,22px);color:var(--gold-br);
  letter-spacing:.5em;margin:18px 0 6px;padding-left:.5em}
.hero__desc{color:var(--parch-dim);font-size:clamp(13px,1.4vw,15px);letter-spacing:.2em;margin-top:8px}
.hero__scroll{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);z-index:3;
  display:flex;flex-direction:column;align-items:center;gap:8px;color:var(--gold-br);font-size:11px;letter-spacing:.4em}
.hero__scroll .mouse{width:24px;height:40px;border:1px solid var(--gold-dim);border-radius:14px;position:relative}
.hero__scroll .mouse::after{content:"";position:absolute;top:7px;left:50%;transform:translateX(-50%);
  width:3px;height:7px;border-radius:3px;background:var(--gold-br);animation:scrolldot 1.6s infinite}
@keyframes scrolldot{0%{opacity:1;transform:translate(-50%,0)}70%{opacity:0;transform:translate(-50%,12px)}100%{opacity:0}}

/* 飞天动画 */
.apsara{position:absolute;pointer-events:none;z-index:1;opacity:0;will-change:transform}
.apsara svg{display:block;filter:drop-shadow(0 0 12px rgba(232,200,121,.35))}
.apsara--l{left:-12%;top:14%;animation:fly-l 18s var(--ease) infinite}
.apsara--r{right:-14%;top:30%;animation:fly-r 22s var(--ease) infinite}
@keyframes fly-l{0%{opacity:0;transform:translate(0,40px) rotate(-4deg) scale(.7)}
  15%{opacity:.9}50%{transform:translate(46vw,-20px) rotate(6deg) scale(.95)}
  85%{opacity:.7}100%{opacity:0;transform:translate(96vw,40px) rotate(-4deg) scale(.7)}}
@keyframes fly-r{0%{opacity:0;transform:translate(0,30px) rotate(4deg) scale(.7) scaleX(-1)}
  18%{opacity:.85}55%{transform:translate(-48vw,-30px) rotate(-6deg) scale(.95) scaleX(-1)}
  88%{opacity:.6}100%{opacity:0;transform:translate(-98vw,20px) rotate(4deg) scale(.7) scaleX(-1)}}

/* 音乐控制 */
.audio-fab{position:fixed;bottom:24px;left:24px;z-index:1100;width:48px;height:48px;border-radius:50%;
  background:rgba(20,16,12,.82);border:1px solid var(--gold-dim);display:grid;place-items:center;
  color:var(--gold-br);transition:.35s var(--ease);backdrop-filter:blur(8px)}
.audio-fab:hover{border-color:var(--gold);transform:scale(1.08)}
.audio-fab .eq{display:flex;gap:2px;align-items:flex-end;height:16px}
.audio-fab .eq span{width:3px;background:var(--gold-br);border-radius:2px}
.audio-fab.playing .eq span{animation:eq .9s infinite ease-in-out}
.audio-fab .eq span:nth-child(1){height:6px;animation-delay:0s}
.audio-fab .eq span:nth-child(2){height:14px;animation-delay:.2s}
.audio-fab .eq span:nth-child(3){height:9px;animation-delay:.4s}
.audio-fab .eq span:nth-child(4){height:12px;animation-delay:.1s}
@keyframes eq{0%,100%{transform:scaleY(.4)}50%{transform:scaleY(1)}}
.audio-fab:not(.playing) .eq span{animation:none;transform:scaleY(.5)}

/* 丝路轨迹动效区段 */
.silksection{position:relative;padding:clamp(80px,12vw,160px) 0;overflow:hidden;
  background:linear-gradient(180deg,var(--ink),#1a1410 50%,var(--ink))}
.silkmap-canvas{position:relative;height:440px;border:1px solid rgba(201,164,76,.16);border-radius:14px;
  overflow:hidden;background:radial-gradient(circle at 50% 50%,#1a2230,var(--ink))}
.silkmap-canvas svg{position:absolute;inset:0;width:100%;height:100%}
.silk-dot{fill:var(--gold-br)}
.silk-route{fill:none;stroke:var(--gold);stroke-width:1.6;stroke-dasharray:6 8;opacity:.55}
.silk-route.go{animation:dash 18s linear infinite}
@keyframes dash{to{stroke-dashoffset:-280}}

/* 三个特色卡 */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:48px}
@media(max-width:860px){.feature-grid{grid-template-columns:1fr}}
.feature-card{position:relative;border:1px solid rgba(201,164,76,.16);border-radius:12px;overflow:hidden;
  background:var(--ink-2);min-height:320px;display:flex;flex-direction:column;justify-content:flex-end;
  padding:26px;transition:.5s var(--ease)}
.feature-card__img{position:absolute;inset:0;background-size:cover;background-position:center;
  opacity:.5;transition:.6s var(--ease)}
.feature-card:hover{transform:translateY(-6px);border-color:var(--gold)}
.feature-card:hover .feature-card__img{opacity:.75;transform:scale(1.06)}
.feature-card>*{position:relative;z-index:2}
.feature-card h3{font-family:var(--f-serif);font-size:22px;color:var(--gold-br);margin-bottom:8px}
.feature-card p{font-size:13px;color:var(--parch-dim)}

/* ===================================================================
   章节总览 · 时间轴 + 立体卡片
   =================================================================== */
.timeline{position:relative;margin-top:60px;padding-left:0}
.timeline::before{content:"";position:absolute;left:50%;top:0;bottom:0;width:2px;transform:translateX(-50%);
  background:linear-gradient(180deg,transparent,var(--gold-dim) 8%,var(--gold-dim) 92%,transparent)}
.tl-item{position:relative;display:grid;grid-template-columns:1fr 80px 1fr;align-items:center;margin-bottom:48px}
.tl-node{grid-column:2;justify-self:center;position:relative;z-index:2;width:54px;height:54px;border-radius:50%;
  background:var(--ink);border:2px solid var(--gold);display:grid;place-items:center;
  font-family:var(--f-serif);color:var(--gold-br);font-size:15px;
  box-shadow:0 0 0 6px rgba(20,16,12,1),0 0 24px rgba(201,164,76,.25)}
.tl-node small{font-size:9px;color:var(--parch-dim);letter-spacing:.1em}
.tl-card{border:1px solid rgba(201,164,76,.18);border-radius:14px;overflow:hidden;background:var(--ink-2);
  transition:.5s var(--ease);cursor:pointer;display:flex;flex-direction:column}
.tl-item:nth-child(odd) .tl-card{grid-column:1;margin-right:24px}
.tl-item:nth-child(even) .tl-card{grid-column:3;margin-left:24px}
.tl-item:nth-child(even){direction:ltr}
.tl-card__img{height:200px;background-size:cover;background-position:center;position:relative;transition:.7s var(--ease)}
.tl-card:hover .tl-card__img{transform:scale(1.06)}
.tl-card__img::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 40%,rgba(20,16,12,.9))}
.tl-card__img .era{position:absolute;left:18px;bottom:14px;z-index:2;font-size:11px;color:var(--gold-br);letter-spacing:.2em}
.tl-card__body{padding:22px 24px 26px}
.tl-card__body h3{font-family:var(--f-serif);font-size:24px;color:var(--paper);margin-bottom:6px}
.tl-card__body .sub{font-size:13px;color:var(--ochre-br);margin-bottom:12px;letter-spacing:.05em}
.tl-card__body p{font-size:14px;color:var(--parch-dim);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.tl-card__body .more{margin-top:16px;font-size:12px;color:var(--gold-br);letter-spacing:.2em;display:inline-flex;gap:6px;align-items:center}
.tl-card:hover{border-color:var(--gold);transform:translateY(-4px);box-shadow:0 18px 40px rgba(0,0,0,.5)}
.tl-card:hover .more i{transform:translateX(4px)}
.tl-card__body .more i{transition:.3s}
@media(max-width:860px){
  .timeline::before{left:24px}
  .tl-item{grid-template-columns:54px 1fr;gap:18px}
  .tl-node{grid-column:1;justify-self:start}
  .tl-item:nth-child(odd) .tl-card,.tl-item:nth-child(even) .tl-card{grid-column:2;margin:0}
}

/* ===================================================================
   章节详情页
   =================================================================== */
.chd-hero{position:relative;height:62vh;min-height:420px;overflow:hidden;display:flex;align-items:flex-end;
  background-size:cover;background-position:center}
.chd-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(20,16,12,.5),rgba(20,16,12,.2) 40%,var(--ink))}
.chd-hero__inner{position:relative;z-index:2;padding:0 0 60px}
.chd-hero__era{color:var(--gold-br);letter-spacing:.4em;font-size:13px;margin-bottom:10px}
.chd-hero__title{font-family:var(--f-serif);font-size:clamp(34px,6vw,64px);font-weight:900;line-height:1.1}
.chd-meta{display:flex;gap:30px;flex-wrap:wrap;margin-top:18px;color:var(--parch-dim);font-size:13px}
.chd-meta span b{color:var(--gold-br);font-weight:400}
.chd-nav{position:relative;z-index:3;display:flex;justify-content:space-between;align-items:center;
  padding:16px clamp(16px,4vw,48px);background:rgba(20,16,12,.9);border-bottom:1px solid rgba(201,164,76,.14)}
.chd-nav a{color:var(--gold-br);font-size:14px;display:inline-flex;gap:8px;align-items:center;opacity:.85;transition:.3s}
.chd-nav a:hover{opacity:1}
.know{display:grid;grid-template-columns:1.4fr 1fr;gap:48px;align-items:start}
@media(max-width:960px){.know{grid-template-columns:1fr}}
.know__prose{font-family:var(--f-serif);font-size:17px;line-height:2.05;color:var(--parch)}
.know__prose h3{font-size:22px;color:var(--gold-br);margin:34px 0 14px;font-weight:700}
.know__prose p{margin-bottom:20px;text-indent:2em}
.know__prose p:first-child::first-letter{font-size:3.4em;float:left;line-height:.9;color:var(--gold-br);
  margin:6px 10px 0 0;font-family:var(--f-serif)}
.aside-sticky{position:sticky;top:calc(var(--nav-h) + 24px)}
.tts-bar{display:flex;align-items:center;gap:14px;padding:16px 20px;border:1px solid rgba(201,164,76,.2);
  border-radius:12px;background:var(--ink-2);margin-bottom:26px}
.tts-bar button{display:inline-flex;align-items:center;gap:8px;font-size:13px;padding:9px 18px;
  border:1px solid var(--gold-dim);border-radius:30px;color:var(--gold-br);transition:.3s}
.tts-bar button:hover{background:var(--gold);color:var(--ink)}
.tts-bar .prog{flex:1;height:4px;border-radius:2px;background:var(--ink-3);overflow:hidden}
.tts-bar .prog i{display:block;height:100%;width:0;background:var(--gold);transition:width .2s linear}
.tts-bar .rate{font-size:12px;color:var(--parch-dim);display:flex;gap:6px}
.tts-bar .rate b{color:var(--gold-br);cursor:pointer;padding:2px 6px;border-radius:4px}
.tts-bar .rate b.on{background:var(--gold);color:var(--ink)}
.zoom-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:24px}
.zoom-tile{position:relative;border-radius:10px;overflow:hidden;cursor:zoom-in;height:240px;
  background-size:cover;background-position:center;transition:.5s var(--ease)}
.zoom-tile:hover{transform:scale(1.02)}
.zoom-tile::after{content:"";position:absolute;inset:0;box-shadow:inset 0 0 0 1px rgba(201,164,76,.3)}
.zoom-tile .cap{position:absolute;left:0;right:0;bottom:0;padding:14px 16px;
  background:linear-gradient(180deg,transparent,rgba(20,16,12,.92));font-size:12px;color:var(--parch)}
.zoom-modal{position:fixed;inset:0;z-index:2000;background:rgba(8,6,4,.96);display:none;
  align-items:center;justify-content:center;padding:40px;cursor:zoom-out}
.zoom-modal.open{display:flex}
.zoom-modal img{max-width:92vw;max-height:88vh;object-fit:contain;border:1px solid var(--gold-dim)}
.zoom-modal .hint{position:absolute;bottom:24px;left:50%;transform:translateX(-50%);color:var(--parch-dim);font-size:13px}
.chd-video{margin-top:20px;border-radius:12px;overflow:hidden;border:1px solid rgba(201,164,76,.18)}
.chd-video video{width:100%;display:block;background:#000}
.kpills{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px}
.kpills span{font-size:12px;padding:6px 14px;border:1px solid rgba(44,110,143,.5);border-radius:30px;color:var(--azur-br);letter-spacing:.05em}

/* ===================================================================
   互动地图 · Leaflet 自定义
   =================================================================== */
.map-wrap{display:grid;grid-template-columns:1fr 380px;gap:24px;height:calc(100vh - var(--nav-h) - 40px);min-height:560px}
@media(max-width:980px){.map-wrap{grid-template-columns:1fr;height:auto}.map-wrap #silkMap{height:60vh}}
#silkMap{height:100%;border-radius:14px;border:1px solid rgba(201,164,76,.2);overflow:hidden;
  background:#0d1014}
.leaflet-container{background:#0d1014;font-family:var(--f-sans)}
.silk-marker{background:radial-gradient(circle,var(--gold-br),var(--gold) 70%);width:14px;height:14px;
  border-radius:50%;border:2px solid var(--ink);box-shadow:0 0 0 2px rgba(201,164,76,.35),0 0 10px rgba(232,200,121,.6);
  cursor:pointer;transition:.3s}
.silk-marker:hover{transform:scale(1.4);box-shadow:0 0 0 3px rgba(232,200,121,.5),0 0 16px rgba(232,200,121,.9)}
.leaflet-popup-content-wrapper{background:#1d1610!important;color:var(--parch);border:1px solid var(--gold-dim);
  border-radius:10px;box-shadow:0 12px 40px rgba(0,0,0,.7)}
.leaflet-popup-tip{background:#1d1610!important;border:1px solid var(--gold-dim)}
.leaflet-popup-content{margin:14px 16px;font-size:13px}
.leaflet-popup-content b{color:var(--gold-br);font-family:var(--f-serif);font-size:15px}
.leaflet-popup-content .pop-era{color:var(--ochre-br);font-size:11px;letter-spacing:.1em;display:block;margin:2px 0 8px}
.leaflet-popup-content a.pop-link{color:var(--azur-br);border:1px solid rgba(44,110,143,.5);padding:4px 12px;
  border-radius:20px;font-size:11px;display:inline-block;margin-top:8px}
.leaflet-control-zoom a{background:#1d1610!important;color:var(--gold-br)!important;border-color:var(--gold-dim)!important}
.leaflet-control-attribution{background:rgba(20,16,12,.6)!important;color:var(--parch-dim)!important;font-size:10px}
.map-side{display:flex;flex-direction:column;gap:14px;overflow:hidden}
.map-side__head{font-family:var(--f-serif);font-size:18px;color:var(--gold-br);display:flex;justify-content:space-between;align-items:baseline}
.map-side__head small{font-size:11px;color:var(--parch-dim);letter-spacing:.2em;font-family:var(--f-sans)}
.city-list{flex:1;overflow-y:auto;padding-right:4px;display:flex;flex-direction:column;gap:8px}
.city-list::-webkit-scrollbar{width:5px}
.city-list::-webkit-scrollbar-thumb{background:var(--gold-dim);border-radius:3px}
.city-item{display:flex;align-items:center;gap:12px;padding:12px 14px;border:1px solid rgba(201,164,76,.12);
  border-radius:10px;cursor:pointer;transition:.3s;background:var(--ink-2)}
.city-item:hover{border-color:var(--gold);transform:translateX(4px)}
.city-item.active{border-color:var(--gold);background:rgba(201,164,76,.07)}
.city-item .dot{width:8px;height:8px;border-radius:50%;background:var(--gold);flex:none}
.city-item .nm{font-family:var(--f-serif);font-size:15px;color:var(--paper)}
.city-item .rg{font-size:11px;color:var(--parch-dim);margin-left:auto}
/* 城市详情卡 */
.city-card{position:fixed;right:-440px;top:0;bottom:0;width:420px;max-width:92vw;z-index:1200;
  background:var(--ink-2);border-left:1px solid var(--gold-dim);box-shadow:-20px 0 60px rgba(0,0,0,.6);
  transition:right .5s var(--ease);overflow-y:auto;padding:0}
.city-card.open{right:0}
.city-card__close{position:absolute;top:16px;right:16px;width:34px;height:34px;border-radius:50%;
  background:var(--ink-3);color:var(--gold-br);z-index:3;font-size:18px}
.city-card__img{height:200px;background-size:cover;background-position:center;position:relative}
.city-card__img::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent,rgba(20,16,12,.7))}
.city-card__body{padding:24px}
.city-card__body h3{font-family:var(--f-serif);font-size:26px;color:var(--gold-br)}
.city-card__body .era{color:var(--ochre-br);font-size:12px;letter-spacing:.2em;margin:6px 0 18px}
.city-card__body p{font-size:14px;color:var(--parch);margin-bottom:16px}
.city-card__body h4{font-size:13px;color:var(--gold-br);letter-spacing:.1em;margin:20px 0 10px;font-family:var(--f-sans)}
.relic-row{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.relic-row img{height:96px;width:100%;object-fit:cover;border-radius:8px;border:1px solid rgba(201,164,76,.2)}

/* ===================================================================
   数字文物长廊 · 瀑布流 + 360°翻转
   =================================================================== */
.gallery-filter{display:flex;flex-wrap:wrap;gap:10px;margin:30px 0 40px}
.gallery-filter button{font-size:13px;padding:7px 16px;border:1px solid rgba(201,164,76,.2);border-radius:30px;
  color:var(--parch-dim);transition:.3s;letter-spacing:.05em}
.gallery-filter button:hover{color:var(--gold-br);border-color:var(--gold-dim)}
.gallery-filter button.on{background:var(--gold);color:var(--ink);border-color:var(--gold)}
.masonry{columns:4;column-gap:22px}
@media(max-width:1100px){.masonry{columns:3}}
@media(max-width:760px){.masonry{columns:2;column-gap:14px}}
@media(max-width:460px){.masonry{columns:1}}
.flip{break-inside:avoid;margin-bottom:22px;perspective:1400px;cursor:pointer}
.flip__inner{position:relative;transform-style:preserve-3d;transition:transform .8s var(--ease);
  border-radius:12px;overflow:hidden}
.flip.flipped .flip__inner{transform:rotateY(180deg)}
.flip__face{backface-visibility:hidden;-webkit-backface-visibility:hidden;border:1px solid rgba(201,164,76,.16);
  border-radius:12px;overflow:hidden;background:var(--ink-2)}
.flip__front img{width:100%;height:auto;display:block;transition:.6s}
.flip:hover .flip__front img{transform:scale(1.05)}
.flip__front .cap{padding:14px 16px;display:flex;justify-content:space-between;align-items:baseline}
.flip__front .cap h4{font-family:var(--f-serif);font-size:16px;color:var(--paper)}
.flip__front .cap small{font-size:11px;color:var(--ochre-br);letter-spacing:.1em}
.flip__front .hint{text-align:center;padding:0 16px 14px;font-size:11px;color:var(--parch-dim);letter-spacing:.15em}
.flip__back{position:absolute;inset:0;transform:rotateY(180deg);display:flex;flex-direction:column;
  background:linear-gradient(160deg,var(--ink-2),#20180f);padding:24px}
.flip__back .tag{font-size:11px;color:var(--gold-br);letter-spacing:.2em;margin-bottom:14px}
.flip__back h4{font-family:var(--f-serif);font-size:20px;color:var(--gold-br);margin-bottom:16px;line-height:1.3}
.flip__back dl{font-size:13px;line-height:1.9}
.flip__back dt{color:var(--ochre-br);display:inline;width:4em}
.flip__back dd{display:inline;color:var(--parch);margin:0}
.flip__back .story{margin-top:16px;font-size:13px;color:var(--parch-dim);line-height:1.85;
  flex:1;overflow:auto}
.flip__back .flipbk{font-size:11px;color:var(--gold-br);letter-spacing:.15em;margin-top:14px;display:inline-flex;gap:6px;align-items:center}
/* 长廊卡片背高度自适应：固定 min-height 防抖 */
.flip{min-height:300px}

/* ===================================================================
   档案馆
   =================================================================== */
.archive-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:26px;margin-top:40px}
@media(max-width:860px){.archive-grid{grid-template-columns:1fr}}
.dl-card{position:relative;border:1px solid rgba(201,164,76,.18);border-radius:14px;overflow:hidden;
  background:var(--ink-2);transition:.5s var(--ease);display:flex;flex-direction:column}
.dl-card:hover{border-color:var(--gold);transform:translateY(-4px)}
.dl-card__top{padding:28px 28px 0;display:flex;align-items:flex-start;gap:18px}
.dl-card__ico{width:54px;height:54px;border-radius:12px;flex:none;display:grid;place-items:center;font-size:24px;
  background:linear-gradient(150deg,rgba(201,164,76,.2),rgba(44,110,143,.15));border:1px solid var(--gold-dim);color:var(--gold-br)}
.dl-card h3{font-family:var(--f-serif);font-size:22px;color:var(--paper)}
.dl-card .meta{font-size:12px;color:var(--parch-dim);letter-spacing:.1em;margin-top:4px}
.dl-card__body{padding:18px 28px 8px;font-size:14px;color:var(--parch-dim);line-height:1.8}
.dl-card__body ul{list-style:none;margin-top:12px}
.dl-card__body li{padding:5px 0;padding-left:18px;position:relative}
.dl-card__body li::before{content:"❖";position:absolute;left:0;color:var(--gold)}
.dl-card__foot{padding:14px 28px 26px;display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:auto}
.dl-card__foot .sz{font-size:12px;color:var(--parch-dim)}
.spec-box{margin-top:40px;border:1px solid rgba(201,164,76,.16);border-radius:14px;overflow:hidden}
.spec-box__hd{background:var(--ink-2);padding:20px 26px;border-bottom:1px solid rgba(201,164,76,.14);
  display:flex;justify-content:space-between;align-items:center}
.spec-box__hd h3{font-family:var(--f-serif);color:var(--gold-br)}
.spec-box__hd .tabs{display:flex;gap:6px}
.spec-box__hd .tabs b{font-size:12px;padding:5px 14px;border-radius:20px;cursor:pointer;color:var(--parch-dim);border:1px solid transparent;transition:.3s}
.spec-box__hd .tabs b.on{color:var(--ink);background:var(--gold);border-color:var(--gold)}
.spec-box__bd{padding:24px 26px;font-size:14px;line-height:1.95;color:var(--parch-dim)}
.spec-box__bd h4{font-family:var(--f-serif);color:var(--gold-br);margin:18px 0 8px;font-size:16px}
.spec-box__bd .pal{display:flex;gap:14px;flex-wrap:wrap;margin:12px 0}
.spec-box__bd .swatch{display:flex;flex-direction:column;align-items:center;gap:6px;font-size:11px;color:var(--parch-dim)}
.spec-box__bd .swatch i{width:46px;height:46px;border-radius:10px;border:1px solid rgba(255,255,255,.1)}
.spec-box__bd code{background:var(--ink-3);padding:1px 8px;border-radius:4px;color:var(--azur-br);font-size:12px}

/* ===================================================================
   AI 讲解员组件
   =================================================================== */
.agent-toggle{position:fixed;right:24px;bottom:24px;z-index:1300;width:64px;height:64px;border-radius:50%;
  border:2px solid var(--gold);background:radial-gradient(circle at 35% 30%,#2a2018,#14100c);
  box-shadow:0 0 0 4px rgba(20,16,12,.6),0 8px 28px rgba(0,0,0,.6),0 0 24px rgba(201,164,76,.3);
  display:grid;place-items:center;overflow:visible;transition:.4s var(--ease)}
.agent-toggle:hover{transform:scale(1.06) rotate(-4deg)}
.agent-toggle img{width:100%;height:100%;object-fit:cover;border-radius:50%}
.agent-toggle .ping{position:absolute;inset:-6px;border-radius:50%;border:1px solid var(--gold);
  animation:ping 2.4s var(--ease) infinite;pointer-events:none}
@keyframes ping{0%{opacity:.6;transform:scale(1)}100%{opacity:0;transform:scale(1.5)}}
.agent-toggle .lbl{position:absolute;right:74px;top:50%;transform:translateY(-50%) translateX(8px);
  background:var(--ink-2);border:1px solid var(--gold-dim);padding:8px 14px;border-radius:8px;
  white-space:nowrap;font-size:13px;color:var(--gold-br);opacity:0;transition:.3s;pointer-events:none}
.agent-toggle:hover .lbl{opacity:1;transform:translateY(-50%) translateX(0)}
.agent-panel{position:fixed;right:24px;bottom:100px;z-index:1300;width:380px;max-width:92vw;height:560px;max-height:78vh;
  background:var(--ink-2);border:1px solid var(--gold-dim);border-radius:18px;box-shadow:0 24px 60px rgba(0,0,0,.7);
  display:flex;flex-direction:column;overflow:hidden;transform:translateY(20px) scale(.96);opacity:0;pointer-events:none;
  transition:.4s var(--ease);transform-origin:bottom right}
.agent-panel.open{transform:none;opacity:1;pointer-events:auto}
.agent-head{display:flex;align-items:center;gap:12px;padding:14px 16px;border-bottom:1px solid rgba(201,164,76,.14);
  background:linear-gradient(120deg,rgba(201,164,76,.08),transparent)}
.agent-head img{width:42px;height:42px;border-radius:50%;border:1px solid var(--gold-dim);object-fit:cover}
.agent-head b{font-family:var(--f-serif);color:var(--gold-br);font-size:15px}
.agent-head small{font-size:11px;color:var(--ochre-br);display:block;letter-spacing:.1em}
.agent-head .agent-close{margin-left:auto;font-size:20px;color:var(--parch-dim);width:32px;height:32px;border-radius:50%}
.agent-head .agent-close:hover{background:var(--ink-3);color:var(--gold-br)}
.agent-body{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:14px}
.agent-body::-webkit-scrollbar{width:5px}
.agent-body::-webkit-scrollbar-thumb{background:var(--gold-dim);border-radius:3px}
.msg{max-width:88%;padding:11px 15px;border-radius:14px;font-size:14px;line-height:1.8;animation:msgin .4s var(--ease)}
@keyframes msgin{from{opacity:0;transform:translateY(8px)}to{opacity:1}}
.msg.bot{align-self:flex-start;background:var(--ink-3);border:1px solid rgba(201,164,76,.12);color:var(--parch);border-bottom-left-radius:4px}
.msg.user{align-self:flex-end;background:linear-gradient(120deg,var(--azur),var(--azur-deep));color:var(--paper);border-bottom-right-radius:4px}
.msg .caret{display:inline-block;width:2px;height:1em;background:var(--gold-br);vertical-align:middle;animation:blink 1s step-end infinite;margin-left:1px}
@keyframes blink{50%{opacity:0}}
.msg .acts{display:flex;gap:8px;margin-top:10px;border-top:1px solid rgba(201,164,76,.12);padding-top:10px}
.msg .acts button{font-size:11px;color:var(--gold-br);padding:3px 10px;border:1px solid var(--gold-dim);border-radius:14px;transition:.3s}
.msg .acts button:hover{background:var(--gold);color:var(--ink)}
.chips{display:flex;flex-wrap:wrap;gap:8px;padding:0 16px 10px}
.chips button{font-size:12px;padding:6px 12px;border:1px solid rgba(201,164,76,.18);border-radius:16px;color:var(--parch-dim);transition:.3s;background:transparent}
.chips button:hover{color:var(--gold-br);border-color:var(--gold-dim)}
.agent-input{display:flex;gap:8px;padding:12px 14px;border-top:1px solid rgba(201,164,76,.14);background:var(--ink)}
.agent-input input{flex:1;background:var(--ink-3);border:1px solid var(--gold-dim);border-radius:22px;
  padding:11px 16px;color:var(--parch);font-size:14px;font-family:inherit;outline:none;transition:.3s}
.agent-input input:focus{border-color:var(--gold)}
.agent-input button.send{width:42px;height:42px;border-radius:50%;background:var(--gold);color:var(--ink);
  display:grid;place-items:center;flex:none;transition:.3s}
.agent-input button.send:hover{background:var(--gold-br)}
.agent-input button.speak{width:42px;height:42px;border-radius:50%;border:1px solid var(--gold-dim);color:var(--gold-br);flex:none;transition:.3s}
.agent-input button.speak.on{background:var(--ochre);color:var(--paper);border-color:var(--ochre)}

/* 视频区通用 */
.video-wrap{position:relative;border-radius:12px;overflow:hidden;border:1px solid rgba(201,164,76,.18);background:#000}
.video-wrap video{width:100%;display:block}
.video-wrap .vlabel{position:absolute;left:14px;top:14px;background:rgba(20,16,12,.7);color:var(--gold-br);
  font-size:11px;padding:4px 12px;border-radius:20px;letter-spacing:.1em;backdrop-filter:blur(4px)}