/* ============================================================
   灰色博物馆 · 线上展  —  设计系统
   美学方向：黑白灰极简 · 沉浸叙事 · 文学气质
   ============================================================ */

:root{
  --bg:        #0e0e0f;
  --bg-2:      #151517;
  --surface:   #1b1b1e;
  --surface-2: #222226;
  --text:      #e9e9e6;
  --text-2:    #a6a6a1;
  --text-3:    #6f6f6c;
  --line:      rgba(255,255,255,.08);
  --line-2:    rgba(255,255,255,.14);
  --accent:    #c9c3b4;   /* 暖灰，极克制 */
  --warn:      #b9a98f;   /* 暗金，仅作提示 */

  --serif:   "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --display: "Cormorant Garamond", "Noto Serif SC", serif;

  --maxw: 1180px;
  --ease: cubic-bezier(.22,.61,.36,1);
}

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

html{ scroll-behavior:smooth; }

body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--serif);
  font-weight:300;
  line-height:1.95;
  letter-spacing:.02em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

/* 全局颗粒/噪点氛围 */
body::after{
  content:"";
  position:fixed; inset:0;
  pointer-events:none;
  z-index:60;
  opacity:.05;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

::selection{ background:rgba(201,195,180,.25); color:#fff; }

a{ color:inherit; text-decoration:none; }

/* ===================== 开场遮罩 ===================== */
.intro{
  position:fixed; inset:0; z-index:100;
  background:radial-gradient(120% 120% at 50% 30%, #1a1a1c 0%, #0b0b0c 70%);
  display:flex; align-items:center; justify-content:center;
  transition:opacity 1.2s var(--ease), visibility 1.2s;
}
.intro.gone{ opacity:0; visibility:hidden; }
.intro-inner{ text-align:center; padding:0 24px; }
.intro-mark{
  font-family:var(--display);
  letter-spacing:.5em; font-size:13px; color:var(--text-3);
  text-transform:uppercase; margin-bottom:26px;
}
.intro-title{
  font-family:var(--serif); font-weight:200;
  font-size:clamp(48px,11vw,120px); letter-spacing:.18em;
  text-indent:.18em; line-height:1.1;
  animation:fadeUp 1.6s var(--ease) both;
}
.intro-sub{
  margin-top:18px; color:var(--text-2);
  font-size:clamp(13px,2vw,17px); letter-spacing:.28em;
  animation:fadeUp 1.6s var(--ease) .25s both;
}
.intro-note{
  margin-top:30px; color:var(--text-3); font-size:14px;
  letter-spacing:.06em;
  animation:fadeUp 1.6s var(--ease) .5s both;
}
.enter-btn{
  margin-top:46px;
  background:transparent; color:var(--text);
  border:1px solid var(--line-2);
  padding:16px 42px; font-family:var(--serif);
  font-size:15px; letter-spacing:.34em; text-indent:.34em;
  cursor:pointer; transition:.5s var(--ease);
  animation:fadeUp 1.6s var(--ease) .75s both;
}
.enter-btn:hover{ background:var(--text); color:#0c0c0d; border-color:var(--text); }
.intro-warn{
  margin-top:42px; max-width:420px; margin-left:auto; margin-right:auto;
  color:var(--text-3); font-size:12px; line-height:1.9; letter-spacing:.04em;
  animation:fadeUp 1.6s var(--ease) 1s both;
}

@keyframes fadeUp{ from{ opacity:0; transform:translateY(24px); } to{ opacity:1; transform:none; } }

/* ===================== 顶栏 ===================== */
.topbar{
  position:fixed; top:0; left:0; right:0; z-index:40;
  display:flex; align-items:center; justify-content:space-between;
  padding:22px clamp(20px,5vw,56px);
  mix-blend-mode:difference;
}
.brand{ display:flex; align-items:baseline; gap:12px; }
.brand-cn{ font-size:18px; letter-spacing:.22em; font-weight:400; }
.brand-en{ font-family:var(--display); font-size:12px; letter-spacing:.34em; color:var(--text-2); }
.topnav{ display:flex; gap:30px; }
.topnav a{
  font-size:13px; letter-spacing:.24em; color:var(--text);
  position:relative; padding-bottom:4px;
}
.topnav a::after{
  content:""; position:absolute; left:0; bottom:0; height:1px; width:0;
  background:currentColor; transition:width .4s var(--ease);
}
.topnav a:hover::after{ width:100%; }

/* ===================== 侧边导航 ===================== */
.sidenav{
  position:fixed; right:26px; top:50%; transform:translateY(-50%);
  z-index:40; display:flex; flex-direction:column; gap:18px;
}
.sidenav .dot{
  width:9px; height:9px; border-radius:50%;
  border:1px solid var(--line-2); background:transparent;
  position:relative; transition:.35s var(--ease);
}
.sidenav .dot:hover{ border-color:var(--text); }
.sidenav .dot.active{ background:var(--accent); border-color:var(--accent); transform:scale(1.35); }
.sidenav .dot::before{
  content:attr(data-label);
  position:absolute; right:20px; top:50%; transform:translateY(-50%);
  font-size:11px; letter-spacing:.18em; color:var(--text-2);
  white-space:nowrap; opacity:0; transition:.3s var(--ease); pointer-events:none;
}
.sidenav .dot:hover::before{ opacity:1; right:18px; }

/* ===================== 通用区块 ===================== */
section{ position:relative; }
.section-head{ max-width:var(--maxw); margin:0 auto; padding:0 clamp(20px,5vw,56px); }
.section-head.center{ text-align:center; }
.sec-num{
  display:inline-block; font-family:var(--display);
  letter-spacing:.4em; font-size:13px; color:var(--text-3);
  text-transform:uppercase; margin-bottom:18px;
}
.sec-title{
  font-weight:200; font-size:clamp(28px,4.6vw,52px);
  letter-spacing:.06em; line-height:1.3;
}
.sec-desc{ margin-top:18px; color:var(--text-2); font-size:15px; letter-spacing:.04em; }

/* ===================== 序厅 ===================== */
.hero{
  min-height:100vh; display:flex; align-items:center; justify-content:center;
  text-align:center; padding:120px 24px 80px;
  background:
    radial-gradient(80% 60% at 50% 35%, rgba(40,40,44,.55) 0%, transparent 70%),
    var(--bg);
}
.hero-grain{
  position:absolute; inset:0;
  background:radial-gradient(circle at 50% 40%, rgba(255,255,255,.04), transparent 60%);
}
.hero-content{ position:relative; z-index:2; }
.hero-eyebrow{
  font-family:var(--display); letter-spacing:.42em; font-size:13px;
  color:var(--text-3); text-transform:uppercase; margin-bottom:30px;
}
.hero-title{
  font-weight:200; font-size:clamp(52px,13vw,150px);
  letter-spacing:.1em; line-height:1.05;
}
.hero-title .thin{ color:var(--text-3); font-weight:200; }
.hero-lead{
  margin-top:34px; color:var(--text-2);
  font-size:clamp(15px,2.2vw,20px); line-height:2.1; letter-spacing:.05em;
}
.scroll-hint{
  margin-top:64px; font-size:12px; letter-spacing:.3em; color:var(--text-3);
  display:flex; flex-direction:column; align-items:center; gap:14px;
}
.scroll-hint span{
  width:1px; height:44px; background:linear-gradient(var(--text-3),transparent);
  animation:drop 2s var(--ease) infinite;
}
@keyframes drop{ 0%{ transform:scaleY(0); transform-origin:top; } 50%{ transform:scaleY(1); transform-origin:top; } 51%{ transform-origin:bottom; } 100%{ transform:scaleY(0); transform-origin:bottom; } }

/* ===================== 关于 ===================== */
.about{ padding:140px 0 120px; }
.about-grid{
  max-width:var(--maxw); margin:60px auto 0; padding:0 clamp(20px,5vw,56px);
  display:grid; grid-template-columns:1.1fr .9fr; gap:clamp(40px,6vw,90px);
  align-items:start;
}
.about-text p{ margin-bottom:26px; font-size:16.5px; color:var(--text); }
.about-text em{ font-style:normal; color:var(--accent); border-bottom:1px solid var(--line-2); padding-bottom:2px; }
.about-cards{ display:flex; flex-direction:column; gap:20px; }
.info-card{
  border:1px solid var(--line); padding:26px 28px; background:var(--bg-2);
  transition:.5s var(--ease);
}
.info-card:hover{ border-color:var(--line-2); transform:translateX(6px); }
.info-card h4{ font-weight:400; font-size:17px; letter-spacing:.08em; margin-bottom:10px; color:var(--text); }
.info-card p{ font-size:14px; color:var(--text-2); line-height:1.9; }

/* ===================== 展区 ===================== */
.gallery{ padding:60px 0 40px; }
.gallery .section-head{ margin-bottom:90px; }
.exhibit{
  max-width:var(--maxw); margin:0 auto;
  padding:90px clamp(20px,5vw,56px);
  display:grid; grid-template-columns:1fr 1fr; gap:clamp(40px,7vw,100px);
  align-items:center;
  border-top:1px solid var(--line);
}
.exhibit.reverse .exhibit-text{ order:2; }
.exhibit.reverse .exhibit-visual{ order:1; }
.exhibit-index{
  position:absolute; left:clamp(20px,5vw,56px); top:36px;
  font-family:var(--display); font-size:clamp(60px,9vw,120px);
  color:rgba(255,255,255,.04); font-weight:500; line-height:1;
}
.exhibit-text h3{
  font-weight:300; font-size:clamp(24px,3.4vw,38px);
  letter-spacing:.05em; margin-bottom:26px; line-height:1.4;
}
.exhibit-text p{ margin-bottom:20px; font-size:16px; color:var(--text-2); }
.exhibit-text em{ font-style:normal; color:var(--accent); }
.exhibit-visual{
  position:relative; min-height:340px;
  display:flex; align-items:center; justify-content:center;
}

/* —— 01 鸟与空笼 —— */
.cage{ position:relative; width:170px; height:230px; }
.cage-roof{
  position:absolute; top:0; left:10px; right:10px; height:46px;
  border:1px solid var(--line-2); border-bottom:none;
  border-radius:85px 85px 0 0;
}
.cage-bars{
  position:absolute; top:44px; left:0; right:0; bottom:14px;
  border:1px solid var(--line-2);
  background:repeating-linear-gradient(90deg, transparent 0 18px, var(--line-2) 18px 19px);
}
.cage-floor{ position:absolute; bottom:0; left:0; right:0; height:14px; border:1px solid var(--line-2); }
.birds{ position:absolute; inset:0; }
.bird{
  position:absolute; width:22px; height:22px;
  animation:flutter var(--d,6s) ease-in-out infinite;
  opacity:.8;
}
.bird svg{ width:100%; height:100%; display:block; }
@keyframes flutter{
  0%,100%{ transform:translateY(0) rotate(-4deg); }
  50%{ transform:translateY(-14px) rotate(5deg); }
}

/* —— 02 镜 —— */
.mirrors{ position:relative; width:320px; height:300px; }
.mirror{
  position:absolute; border:1px solid var(--line-2);
  background:linear-gradient(135deg, rgba(255,255,255,.06), rgba(255,255,255,.01));
  box-shadow:inset 0 0 40px rgba(255,255,255,.05);
}
.mirror::after{
  content:"你"; position:absolute; inset:0; display:flex; align-items:center; justify-content:center;
  font-size:30px; color:rgba(255,255,255,.18); letter-spacing:.1em;
}
.m1{ width:150px; height:200px; left:0; top:40px; transform:rotate(-8deg); }
.m2{ width:150px; height:200px; right:0; top:20px; transform:rotate(7deg); }
.m3{ width:120px; height:150px; left:100px; bottom:0; transform:rotate(-2deg); }
.mirror-center{
  position:absolute; left:50%; top:50%; transform:translate(-50%,-50%);
  width:64px; height:64px; border-radius:50%; border:1px solid var(--accent);
  display:flex; align-items:center; justify-content:center;
  font-size:15px; letter-spacing:.1em; color:var(--accent);
  background:rgba(14,14,15,.7);
}

/* —— 03 面具与绳 —— */
.mask-svg{ width:min(100%,300px); height:auto; filter:drop-shadow(0 0 30px rgba(0,0,0,.6)); }
.rope{ animation:ropeSwing 5s ease-in-out infinite; transform-origin:150px 120px; }
@keyframes ropeSwing{ 0%,100%{ transform:rotate(-1.5deg); } 50%{ transform:rotate(1.5deg); } }

/* —— 04 药墙 —— */
.pills{ position:relative; width:300px; height:320px; overflow:hidden;
  border:1px solid var(--line); background:var(--bg-2); }
.screen-glow{
  position:absolute; inset:0;
  background:radial-gradient(60% 40% at 50% 60%, rgba(255,255,255,.07), transparent 70%);
}
.pill{
  position:absolute; width:26px; height:11px; border-radius:11px;
  opacity:.85; animation:pillBreath 4s ease-in-out infinite;
}
.pill.reach{ box-shadow:0 0 14px rgba(201,195,180,.6); animation:none; opacity:1; }
@keyframes pillBreath{ 0%,100%{ opacity:.55; } 50%{ opacity:.9; } }

/* —— 05 手影 —— */
.screen{
  position:relative; width:260px; height:320px; border:1px solid var(--line);
  background:linear-gradient(180deg, #141416, #0a0a0b);
  display:flex; align-items:center; justify-content:center; overflow:hidden;
}
.screen::before{
  content:""; position:absolute; inset:0;
  background:radial-gradient(50% 60% at 50% 55%, rgba(255,255,255,.05), transparent 70%);
}
.hand-svg{ width:170px; height:auto; filter:blur(.4px); animation:handBreath 6s ease-in-out infinite; }
@keyframes handBreath{ 0%,100%{ transform:scale(1); opacity:.85; } 50%{ transform:scale(1.04); opacity:1; } }

/* —— 06 树洞 —— */
.tree-hole{ flex-direction:column; align-items:stretch; gap:26px; }
.tree-form{ display:flex; flex-direction:column; gap:12px; }
.tree-form label{ font-size:13px; letter-spacing:.14em; color:var(--text-2); }
.tree-form textarea{
  width:100%; min-height:96px; resize:vertical;
  background:var(--bg-2); border:1px solid var(--line); color:var(--text);
  font-family:var(--serif); font-size:15px; line-height:1.8;
  padding:16px 18px; letter-spacing:.03em;
}
.tree-form textarea:focus{ outline:none; border-color:var(--line-2); }
.tree-actions{ display:flex; align-items:center; justify-content:space-between; }
.tree-count{ font-size:12px; color:var(--text-3); }
.tree-count i{ font-style:normal; }
.tree-submit{
  background:transparent; border:1px solid var(--line-2); color:var(--text);
  padding:10px 28px; font-family:var(--serif); font-size:13px; letter-spacing:.3em; text-indent:.3em;
  cursor:pointer; transition:.4s var(--ease);
}
.tree-submit:hover{ background:var(--text); color:#0c0c0d; }
.tree-wall{ display:flex; flex-wrap:wrap; gap:12px; }
.note{
  background:#e9e7df; color:#2a2a28; padding:14px 16px;
  font-size:14px; line-height:1.7; max-width:200px;
  box-shadow:0 6px 18px rgba(0,0,0,.4);
  transform:rotate(var(--r,0deg));
  position:relative;
}
.note::before{
  content:""; position:absolute; top:6px; left:50%; transform:translateX(-50%);
  width:18px; height:10px; background:rgba(0,0,0,.12); border-radius:2px;
}
.note .note-meta{ display:block; margin-top:8px; font-size:11px; color:#7a786f; letter-spacing:.08em; }

/* ===================== 数据 ===================== */
.data{ padding:140px 0 120px; background:var(--bg-2); }
.stat-grid{
  max-width:var(--maxw); margin:70px auto 0; padding:0 clamp(20px,5vw,56px);
  display:grid; grid-template-columns:repeat(3,1fr); gap:30px;
}
.stat{ border-top:1px solid var(--line-2); padding-top:26px; }
.stat-num{
  font-family:var(--display); font-weight:500;
  font-size:clamp(46px,8vw,92px); line-height:1; color:var(--text);
  letter-spacing:.01em;
}
.stat-label{ margin-top:18px; color:var(--text-2); font-size:15px; letter-spacing:.04em; }
.bars{
  max-width:760px; margin:80px auto 0; padding:0 clamp(20px,5vw,56px);
  display:flex; flex-direction:column; gap:26px;
}
.bar-row{ display:grid; grid-template-columns:200px 1fr 64px; align-items:center; gap:18px; }
.bar-name{ font-size:14px; color:var(--text-2); letter-spacing:.04em; }
.bar-track{ height:8px; background:var(--surface-2); border:1px solid var(--line); position:relative; overflow:hidden; }
.bar-fill{ height:100%; width:0; background:var(--text-2); transition:width 1.6s var(--ease); }
.bar-fill.warn{ background:var(--warn); }
.bar-fill.dim{ background:var(--text-3); }
.bar-val{ font-family:var(--display); font-size:20px; text-align:right; color:var(--text); }
.data-note{ max-width:760px; margin:50px auto 0; padding:0 clamp(20px,5vw,56px); font-size:12px; color:var(--text-3); letter-spacing:.04em; }

/* ===================== 资源 ===================== */
.help{ padding:140px 0 120px; text-align:center; }
.help-core{ margin:60px auto 0; max-width:680px; padding:0 24px; }
.help-pre{ font-family:var(--display); letter-spacing:.34em; font-size:14px; color:var(--text-3); text-transform:uppercase; }
.help-phone{
  display:inline-block; margin:24px 0;
  font-family:var(--display); font-weight:500; font-size:clamp(64px,13vw,140px);
  letter-spacing:.08em; color:var(--text); border-bottom:2px solid var(--accent);
  transition:.4s var(--ease);
}
.help-phone:hover{ color:var(--accent); }
.help-tip{ color:var(--text-2); font-size:15px; line-height:2; letter-spacing:.04em; }
.help-list{
  max-width:var(--maxw); margin:80px auto 0; padding:0 clamp(20px,5vw,56px);
  display:grid; grid-template-columns:repeat(3,1fr); gap:30px; text-align:left;
}
.help-item{ border:1px solid var(--line); padding:30px 28px; background:var(--bg-2); }
.help-item h4{ font-weight:400; font-size:19px; letter-spacing:.08em; margin-bottom:12px; }
.help-item p{ font-size:14px; color:var(--text-2); line-height:1.95; }

/* ===================== 页脚 ===================== */
.footer{ padding:80px 24px 70px; text-align:center; border-top:1px solid var(--line); }
.footer-line{ width:40px; height:1px; background:var(--line-2); margin:0 auto 34px; }
.footer-brand{ font-size:15px; letter-spacing:.3em; color:var(--text); }
.footer-text{ margin-top:14px; font-size:12.5px; color:var(--text-3); line-height:1.9; letter-spacing:.03em; max-width:560px; margin-left:auto; margin-right:auto; }
.footer-text.dim{ color:var(--text-2); margin-top:20px; }

/* ===================== 滚动揭示动画 ===================== */
.reveal{ opacity:0; transform:translateY(34px); transition:opacity 1s var(--ease), transform 1s var(--ease); }
.reveal.in{ opacity:1; transform:none; }

/* ===================== 响应式 ===================== */
@media (max-width:880px){
  .topnav{ display:none; }
  .sidenav{ right:14px; gap:14px; }
  .sidenav .dot::before{ display:none; }
  .about-grid{ grid-template-columns:1fr; }
  .exhibit{ grid-template-columns:1fr; gap:48px; padding:70px clamp(20px,5vw,56px); }
  .exhibit.reverse .exhibit-text{ order:1; }
  .exhibit.reverse .exhibit-visual{ order:2; }
  .exhibit-index{ position:static; margin-bottom:10px; font-size:64px; }
  .exhibit-visual{ min-height:280px; }
  .stat-grid{ grid-template-columns:1fr; gap:36px; }
  .help-list{ grid-template-columns:1fr; }
  .bar-row{ grid-template-columns:120px 1fr 50px; gap:12px; }
}
@media (prefers-reduced-motion:reduce){
  *{ animation:none !important; scroll-behavior:auto; }
  .reveal{ opacity:1; transform:none; }
}