/* ============================================================
   中国煤炭科技博物馆 · 沉浸式宣传页
   深色电影感设计系统 — 纯 CSS，无框架
   ============================================================ */
:root{
  --bg:#0c0b0d; --bg2:#121015; --panel:#17141b;
  --ink:#f2ede4; --ink-soft:rgba(242,237,228,.66); --ink-faint:rgba(242,237,228,.40);
  --ember:#ff6a00; --ember-2:#ff8a3a; --gold:#f2c14e;
  --line:rgba(242,237,228,.13); --line-2:rgba(242,237,228,.07);
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong",serif;
  --sans:"Noto Sans SC","PingFang SC","Microsoft YaHei","Source Han Sans SC",system-ui,sans-serif;
  --cinzel:"Cinzel",var(--serif);
  --maxw:1180px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--bg);color:var(--ink);font-family:var(--sans);
  font-weight:300;line-height:1.75;letter-spacing:.01em;
  overflow-x:hidden;-webkit-font-smoothing:antialiased;
}
img,video,canvas{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
::selection{background:rgba(238,90,28,.30);color:#fff}
body::-webkit-scrollbar{width:10px}
body::-webkit-scrollbar-track{background:#0a090b}
body::-webkit-scrollbar-thumb{background:#2a2530;border-radius:10px}
body::-webkit-scrollbar-thumb:hover{background:var(--ember)}

/* ---- 排版基元 ---- */
.wrap{width:min(100% - 44px,var(--maxw));margin-inline:auto}
.section{padding:clamp(80px,12vh,160px) 0;position:relative}
.eyebrow{
  font-family:var(--cinzel);font-weight:600;letter-spacing:.34em;
  text-transform:uppercase;font-size:12px;color:var(--ember);
  display:flex;align-items:center;gap:14px;margin-bottom:26px;
}
.eyebrow::before{content:"";width:34px;height:1px;background:linear-gradient(90deg,var(--ember),transparent)}
.display{
  font-family:var(--serif);font-weight:700;line-height:1.18;
  font-size:clamp(30px,4.6vw,58px);letter-spacing:.01em;color:var(--ink);
}
.lead{
  margin-top:26px;max-width:62ch;font-size:clamp(15px,1.25vw,18px);
  color:var(--ink-soft);line-height:2;
}
.hl{color:var(--ember)}

/* ---- 滚动进度 ---- */
.scroll-progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:120;background:transparent}
.scroll-progress span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--gold),var(--ember));box-shadow:0 0 12px rgba(238,90,28,.6)}

/* ---- 导航 ---- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  display:flex;align-items:center;justify-content:space-between;
  padding:20px clamp(22px,4vw,48px);
  transition:background .4s var(--ease),padding .4s var(--ease),border-color .4s;
  border-bottom:1px solid transparent;
}
.nav.scrolled{
  background:rgba(10,9,11,.78);backdrop-filter:blur(14px);
  padding-top:14px;padding-bottom:14px;border-bottom:1px solid var(--line-2);
}
.nav-brand{display:flex;align-items:center;gap:12px}
.nav-logo{width:38px;height:38px;object-fit:contain;filter:drop-shadow(0 0 10px rgba(238,90,28,.25))}
.nav-name{font-family:var(--serif);font-weight:700;font-size:17px;letter-spacing:.06em;white-space:nowrap}
.nav-links{display:flex;gap:30px}
.nav-links a{position:relative;font-size:14.5px;color:var(--ink-soft);transition:color .3s;padding:4px 0}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:1px;background:var(--ember);transition:width .35s var(--ease)}
.nav-links a:hover{color:var(--ink)}
.nav-links a:hover::after{width:100%}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{width:24px;height:2px;background:var(--ink);transition:.3s var(--ease)}

/* ============================================================
   首屏
   ============================================================ */
.hero{position:relative;height:100svh;min-height:600px;display:flex;align-items:center;justify-content:center;text-align:center;overflow:hidden}
.hero-media,.hero-video,.hero-fallback{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero-fallback{z-index:0}
.hero-video{z-index:1}
.hero-veil{position:absolute;inset:0;z-index:2;
  background:
    radial-gradient(120% 90% at 50% 8%,transparent 30%,rgba(8,7,9,.55) 100%),
    linear-gradient(180deg,rgba(8,7,9,.55) 0%,rgba(8,7,9,.18) 38%,rgba(8,7,9,.72) 100%);
}
.embers{position:absolute;inset:0;z-index:3;pointer-events:none;opacity:.8}
.hero-inner{position:relative;z-index:4;padding:0 22px;max-width:980px}
.hero .eyebrow{justify-content:center;color:var(--gold);letter-spacing:.42em;font-size:11px}
.hero .eyebrow::before{display:none}
.hero-title{
  font-family:var(--serif);font-weight:900;
  font-size:clamp(40px,8.2vw,108px);line-height:1.04;letter-spacing:.06em;
  text-shadow:0 4px 40px rgba(0,0,0,.5);
}
.hero-tagline{
  margin-top:22px;display:flex;align-items:center;justify-content:center;gap:18px;
  font-family:var(--serif);font-size:clamp(17px,2.4vw,26px);letter-spacing:.32em;color:var(--ink);
}
.hero-tagline i{color:var(--ember);font-style:normal;font-size:1.3em}
.hero-sub{margin-top:18px;color:var(--ink-soft);font-size:clamp(14px,1.5vw,17px);letter-spacing:.18em}
.hero-actions{margin-top:42px;display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

.btn{
  display:inline-flex;align-items:center;gap:9px;cursor:pointer;
  font-family:var(--sans);font-size:15px;font-weight:400;letter-spacing:.08em;
  padding:14px 30px;border-radius:999px;border:1px solid transparent;transition:.35s var(--ease);
}
.btn-primary{background:var(--ember);color:#1a0e07;font-weight:500;box-shadow:0 10px 34px -10px rgba(238,90,28,.7)}
.btn-primary:hover{background:var(--ember-2);transform:translateY(-2px);box-shadow:0 16px 40px -10px rgba(238,90,28,.8)}
.btn-ghost{background:rgba(255,255,255,.05);border-color:var(--line);color:var(--ink);backdrop-filter:blur(6px)}
.btn-ghost:hover{border-color:var(--ember);color:#fff;transform:translateY(-2px)}

.scroll-cue{position:absolute;left:50%;bottom:30px;transform:translateX(-50%);z-index:5;width:26px;height:42px;border:1px solid var(--line);border-radius:14px;display:flex;justify-content:center;padding-top:8px}
.scroll-cue span{width:3px;height:8px;border-radius:3px;background:var(--ember);animation:cue 1.6s var(--ease) infinite}
@keyframes cue{0%{opacity:0;transform:translateY(-3px)}40%{opacity:1}80%{opacity:0;transform:translateY(12px)}}

/* ============================================================
   序章
   ============================================================ */
.intro{background:radial-gradient(140% 80% at 80% -10%,rgba(238,90,28,.07),transparent 55%),var(--bg)}
.stats{margin-top:60px;display:flex;gap:clamp(24px,5vw,72px);flex-wrap:wrap;border-top:1px solid var(--line);padding-top:36px}
.stat b{font-family:var(--cinzel);font-weight:600;font-size:clamp(34px,4vw,52px);color:var(--ink);display:block;line-height:1}
.stat b i{font-style:normal;font-size:.4em;color:var(--gold);margin-left:4px;letter-spacing:.05em}
.stat span{display:block;margin-top:10px;color:var(--ink-faint);font-size:13px;letter-spacing:.2em}

/* ============================================================
   六大展区
   ============================================================ */
.zones{background:var(--bg)}
.zones-head{padding-top:clamp(80px,12vh,150px);padding-bottom:20px}
.zone{position:relative;min-height:100svh;display:flex;align-items:center;overflow:hidden}
.zone-bg{position:absolute;inset:-8% 0;background-size:cover;background-position:center;will-change:transform;transform:scale(1.06)}
.zone-veil{position:absolute;inset:0;background:linear-gradient(90deg,rgba(8,7,9,.92) 0%,rgba(8,7,9,.72) 42%,rgba(8,7,9,.34) 100%)}
.zone[data-accent=gold] .zone-veil{background:linear-gradient(270deg,rgba(8,7,9,.92) 0%,rgba(8,7,9,.72) 42%,rgba(8,7,9,.34) 100%)}
/* 六大展区按主题做不同色彩分级，让共用底图也呈现迥异氛围 */
.zone[data-grade=cool] .zone-bg{filter:brightness(.96) saturate(.82) contrast(1.04)}
.zone[data-grade=sepia] .zone-bg{filter:sepia(.55) saturate(.9) brightness(.8) contrast(1.05)}
.zone[data-grade=faded] .zone-bg{filter:saturate(.7) brightness(.9) contrast(.96)}
.zone[data-grade=industrial] .zone-bg{filter:saturate(1.18) brightness(.82) hue-rotate(-8deg) contrast(1.06)}
.zone[data-grade=tech] .zone-bg{filter:saturate(1.05) brightness(.78) hue-rotate(150deg) contrast(1.1)}
.zone[data-grade=future] .zone-bg{filter:saturate(.95) brightness(.82) hue-rotate(175deg) contrast(1.05)}
.zone-content{position:relative;z-index:2;max-width:620px}
.zone-content.right{margin-left:auto;text-align:right}
.zone-no{font-family:var(--cinzel);font-weight:600;font-size:clamp(80px,16vw,200px);line-height:.8;color:transparent;-webkit-text-stroke:1.4px rgba(242,237,228,.22);display:block;margin-bottom:6px}
.zone[data-accent=ember] .zone-eyebrow{color:var(--ember)}
.zone[data-accent=gold] .zone-eyebrow{color:var(--gold)}
.zone-eyebrow{font-size:14px;letter-spacing:.4em;margin-bottom:14px}
.zone-title{font-family:var(--serif);font-weight:900;font-size:clamp(40px,6.5vw,84px);line-height:1.05;letter-spacing:.04em}
.zone-theme{font-family:var(--serif);font-size:clamp(17px,2vw,24px);color:var(--ink-soft);letter-spacing:.3em;margin-top:12px}
.zone-desc{margin-top:24px;font-size:clamp(15px,1.2vw,17px);color:var(--ink-soft);line-height:2;max-width:46ch}
.zone-content.right .zone-desc{margin-left:auto}
.zone-content.right .eyebrow{justify-content:flex-end}

/* ============================================================
   吉祥物
   ============================================================ */
.mascot{background:linear-gradient(180deg,#0a0a0c,#141016 60%,#0c0b0d)}
.mascot-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(30px,6vw,80px);align-items:center}
.mascot-figure{position:relative;display:flex;justify-content:center}
.mascot-figure img{width:min(460px,90%);position:relative;z-index:2;filter:drop-shadow(0 26px 44px rgba(0,0,0,.6));animation:float 6s ease-in-out infinite}
.mascot-glow{position:absolute;inset:0;z-index:1;background:radial-gradient(closest-side,rgba(238,90,28,.30),transparent 70%);filter:blur(20px)}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-16px)}}
.mascot-traits{margin-top:34px;list-style:none;display:grid;gap:14px}
.mascot-traits li{padding-left:0;color:var(--ink-soft);font-size:15px;display:flex;align-items:baseline;gap:14px}
.mascot-traits b{font-family:var(--serif);font-weight:700;color:var(--gold);min-width:52px;font-size:16px}

/* ============================================================
   视觉识别
   ============================================================ */
.vi{background:var(--bg2)}
.vi-grid{margin-top:54px;display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.vi-card{position:relative;overflow:hidden;border:1px solid var(--line-2);border-radius:14px;background:#000;cursor:zoom-in;grid-column:span 2}
.vi-card.vi-tall{grid-column:span 2;grid-row:span 2}
.vi-card.vi-wide{grid-column:span 4}
.vi-card img{width:100%;height:100%;object-fit:cover;transition:transform .8s var(--ease);opacity:.92}
.vi-card:hover img{transform:scale(1.05);opacity:1}
.vi-card figcaption{position:absolute;left:0;right:0;bottom:0;padding:18px;font-size:13px;letter-spacing:.16em;color:var(--ink);
  background:linear-gradient(180deg,transparent,rgba(8,7,9,.85));}
@media(min-width:861px){.vi-card{grid-column:span 1}.vi-card.vi-tall{grid-column:span 1;grid-row:span 2}.vi-card.vi-wide{grid-column:span 2}}

/* ============================================================
   文创
   ============================================================ */
.merch{position:relative;overflow:hidden;background:#000}
.merch-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.22;transform:scale(1.05)}
.merch-veil{position:absolute;inset:0;background:linear-gradient(180deg,rgba(8,7,9,.86),rgba(8,7,9,.94))}
.merch .wrap{position:relative;z-index:2}
.merch-gallery{margin-top:54px;display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:18px}
.merch-card{overflow:hidden;border-radius:14px;border:1px solid var(--line-2);background:#000;cursor:zoom-in}
.merch-card img{width:100%;height:100%;object-fit:cover;aspect-ratio:16/10;transition:transform .8s var(--ease);opacity:.94}
.merch-card:hover img{transform:scale(1.05);opacity:1}
.merch-tags{margin-top:30px;list-style:none;display:flex;flex-wrap:wrap;gap:12px}
.merch-tags li{font-size:13px;letter-spacing:.1em;color:var(--ink-soft);border:1px solid var(--line);border-radius:999px;padding:8px 18px;transition:.3s}
.merch-tags li:hover{border-color:var(--ember);color:var(--ink)}

/* ============================================================
   参观
   ============================================================ */
.visit{background:var(--bg)}
.visit-grid{display:grid;grid-template-columns:1fr 1.05fr;gap:clamp(30px,6vw,76px);align-items:center}
.info-list{margin-top:40px;display:grid;gap:0}
.info-list>div{display:grid;grid-template-columns:96px 1fr;gap:24px;padding:20px 0;border-top:1px solid var(--line)}
.info-list>div:last-child{border-bottom:1px solid var(--line)}
.info-list dt{color:var(--gold);font-size:14px;letter-spacing:.2em;font-family:var(--serif)}
.info-list dd{color:var(--ink);font-size:16px}
.info-list dd small{display:block;color:var(--ink-faint);font-size:12.5px;margin-top:4px;letter-spacing:.04em}
.visit-note{margin-top:34px;font-family:var(--serif);font-style:italic;color:var(--ink-soft);font-size:16px;line-height:2;border-left:2px solid var(--ember);padding-left:20px}
.visit-map{overflow:hidden;border-radius:16px;border:1px solid var(--line-2);background:#000}
.visit-map img{width:100%}
.visit-map figcaption{padding:14px 18px;font-size:13px;color:var(--ink-faint);letter-spacing:.14em;text-align:center}

/* ============================================================
   页脚
   ============================================================ */
.footer{background:#08070a;border-top:1px solid var(--line-2);padding:70px 0 50px;text-align:center}
.footer-logo{width:min(380px,72%);margin:0 auto 8px;opacity:.95}
.footer-tag{font-family:var(--serif);letter-spacing:.34em;color:var(--ink-soft);font-size:15px;margin-top:6px}
.footer-meta{margin-top:26px;color:var(--ink-faint);font-size:13px;letter-spacing:.06em}
.footer-credit{margin-top:8px;color:var(--ink-faint);font-size:13px;letter-spacing:.12em}
.to-top{display:inline-block;margin-top:28px;font-size:13px;letter-spacing:.18em;color:var(--ink-soft);border:1px solid var(--line);border-radius:999px;padding:10px 24px;transition:.3s}
.to-top:hover{border-color:var(--ember);color:var(--ink)}

/* ============================================================
   灯箱
   ============================================================ */
.lightbox{position:fixed;inset:0;z-index:200;display:none;align-items:center;justify-content:center;
  background:rgba(6,5,7,.94);backdrop-filter:blur(8px);padding:30px}
.lightbox.open{display:flex;animation:fade .3s var(--ease)}
@keyframes fade{from{opacity:0}to{opacity:1}}
.lightbox-stage{max-width:94vw;max-height:90vh;display:flex}
.lightbox-stage img,.lightbox-stage video{max-width:94vw;max-height:90vh;border-radius:10px;box-shadow:0 30px 80px rgba(0,0,0,.6)}
.lightbox-close{position:absolute;top:22px;right:28px;width:48px;height:48px;border-radius:50%;border:1px solid var(--line);background:rgba(255,255,255,.05);color:var(--ink);font-size:26px;cursor:pointer;transition:.3s}
.lightbox-close:hover{border-color:var(--ember);color:#fff;transform:rotate(90deg)}

/* ============================================================
   滚动揭示动画
   ============================================================ */
[data-reveal]{opacity:0;transform:translateY(34px);transition:opacity 1s var(--ease),transform 1s var(--ease)}
[data-reveal].in{opacity:1;transform:none}
.reveal-group [data-reveal]:nth-child(2){transition-delay:.08s}
.reveal-group [data-reveal]:nth-child(3){transition-delay:.16s}
.reveal-group [data-reveal]:nth-child(4){transition-delay:.24s}
.reveal-group [data-reveal]:nth-child(5){transition-delay:.32s}
.zone-content>*{opacity:0;transform:translateY(30px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.zone.in .zone-content>*{opacity:1;transform:none}
.zone.in .zone-content>*:nth-child(2){transition-delay:.08s}
.zone.in .zone-content>*:nth-child(3){transition-delay:.16s}
.zone.in .zone-content>*:nth-child(4){transition-delay:.24s}
.zone.in .zone-content>*:nth-child(5){transition-delay:.32s}

/* ============================================================
   响应式
   ============================================================ */
@media(max-width:860px){
  .nav-links{position:fixed;inset:0 0 0 auto;width:min(78vw,320px);flex-direction:column;justify-content:center;gap:26px;
    background:rgba(10,9,11,.97);backdrop-filter:blur(16px);padding:40px;transform:translateX(100%);transition:transform .45s var(--ease);border-left:1px solid var(--line)}
  .nav-links.open{transform:none}
  .nav-links a{font-size:20px;font-family:var(--serif)}
  .nav-toggle{display:flex;z-index:101}
  .nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-toggle.open span:nth-child(2){opacity:0}
  .nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .nav-name{font-size:15px}
  .mascot-grid,.visit-grid{grid-template-columns:1fr}
  .mascot-figure{order:-1}
  .merch-gallery{grid-template-columns:1fr 1fr}
  .merch-gallery .merch-card:first-child{grid-column:1/-1}
  .zone-content,.zone-content.right{max-width:none;text-align:left}
  .zone-content.right{margin-left:0}
  .zone-content.right .zone-desc{margin-left:0}
  .zone-content.right .eyebrow{justify-content:flex-start}
  .zone-veil,.zone[data-accent=gold] .zone-veil{background:linear-gradient(180deg,rgba(8,7,9,.62),rgba(8,7,9,.9))}
  .info-list>div{grid-template-columns:84px 1fr;gap:16px}
}
@media(max-width:520px){
  .vi-grid{grid-template-columns:1fr 1fr}
  .vi-card,.vi-card.vi-tall,.vi-card.vi-wide{grid-column:span 2;grid-row:auto}
  .merch-gallery{grid-template-columns:1fr}
  .hero-tagline{gap:12px}
  .stats{gap:28px}
}

/* ---- 降低动效偏好 ---- */
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  [data-reveal],.zone-content>*{opacity:1!important;transform:none!important}
  .embers{display:none}
}