/* ===========================================================
   都江堰 · 李冰  —  滚动叙事长页
   =========================================================== */

:root{
  /* 墨与纸 */
  --ink-deep:#0f0d0c;      /* 首屏底 · 深墨黑 */
  --ink-mid:#3a332b;       /* 首屏光晕 · 深褐 */
  --ink:#1c1917;           /* 正文墨色 */
  --paper:#f4efe6;         /* 宣纸米黄 */
  --paper-2:#e9e1d2;       /* 纸的暗部 */
  --cinnabar:#9e2b25;      /* 朱砂 */
  --cinnabar-2:#c0453a;
  --stone:#5a6670;         /* 石青灰 */
  --muted:#7a6f62;

  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong","SimSun",serif;

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

*{box-sizing:border-box;}

html{scroll-behavior:smooth;}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-serif);
  font-weight:400;
  line-height:1.9;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

img{display:block;max-width:100%;}
h1,h2,h3{margin:0;font-weight:600;line-height:1.35;}
p{margin:0;}
ul{margin:0;padding:0;list-style:none;}

/* ---------- 纸纹噪点 ---------- */
.grain{
  position:fixed;inset:0;z-index:60;pointer-events:none;
  opacity:.5;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.28'/%3E%3C/svg%3E");
}

/* ---------- 顶栏 ---------- */
.topbar{
  position:fixed;top:0;left:0;right:0;z-index:50;
  display:flex;justify-content:space-between;align-items:baseline;
  padding:22px clamp(20px,5vw,64px);
  color:var(--paper);
  mix-blend-mode:difference;
  font-size:13px;letter-spacing:.28em;
  pointer-events:none;
}
.topbar-mark{font-weight:600;}
.topbar-sub{opacity:.65;font-size:11px;}

/* ===========================================================
   ACT I  悬疑
   =========================================================== */
.act-suspect{
  position:relative;
  min-height:100svh;
  display:flex;align-items:center;justify-content:center;
  background:
    radial-gradient(ellipse 70% 60% at 50% 42%, var(--ink-mid) 0%, #1b1714 45%, var(--ink-deep) 100%);
  overflow:hidden;
}
.suspect-glow{
  position:absolute;left:50%;top:38%;transform:translate(-50%,-50%);
  width:min(72vw,760px);aspect-ratio:1;border-radius:50%;
  background:radial-gradient(circle, rgba(154,124,84,.20) 0%, rgba(154,124,84,0) 62%);
  filter:blur(10px);
}

.suspect-inner{
  position:relative;z-index:2;
  width:min(1240px,92vw);
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:clamp(16px,3vw,48px);
}

.suspect-copy{display:flex;}
.suspect-copy:first-child{justify-content:flex-end;align-self:flex-start;padding-top:6vh;}
.suspect-copy:last-child{justify-content:flex-start;align-self:flex-end;padding-bottom:8vh;}

.suspect-line{
  margin:0;
  color:#efe7db;
  font-weight:900;
  font-size:clamp(20px,3.1vw,44px);
  line-height:1.5;
  letter-spacing:.04em;
  text-shadow:0 2px 26px rgba(0,0,0,.7);
}
.suspect-line em{
  font-style:normal;
  color:var(--cinnabar-2);
  text-shadow:0 0 30px rgba(192,69,58,.45);
}
.line-a{max-width:12em;text-align:right;}
.line-b{max-width:12em;}

/* 逐字淡入 */
.suspect-line .ch{
  display:inline-block;
  opacity:0;
  transform:translateY(.4em);
  animation:chIn .7s var(--ease) forwards;
}
@keyframes chIn{to{opacity:1;transform:none;}}

/* 剪影 */
.silhouette{
  margin:0;
  align-self:center;
  animation:silIn 1.2s var(--ease) both;
}
.silhouette img{
  height:clamp(300px,66svh,720px);
  width:auto;
  object-fit:contain;
  mix-blend-mode:multiply;
  filter:grayscale(1) contrast(1.35) brightness(1.05);
  -webkit-mask-image:radial-gradient(ellipse 62% 66% at 50% 45%, #000 58%, rgba(0,0,0,.55) 78%, transparent 100%);
          mask-image:radial-gradient(ellipse 62% 66% at 50% 45%, #000 58%, rgba(0,0,0,.55) 78%, transparent 100%);
}
@keyframes silIn{
  from{opacity:0;transform:scale(.8);}
  to{opacity:1;transform:scale(1);}
}

/* 滚动提示 */
.scroll-hint{
  position:absolute;left:50%;bottom:36px;transform:translateX(-50%);
  z-index:3;display:flex;flex-direction:column;align-items:center;gap:12px;
  color:#c9bfae;font-size:11px;letter-spacing:.42em;
  animation:hintIn 1.4s var(--ease) .9s both;
}
.hint-rail{
  position:relative;display:block;width:1px;height:56px;
  background:linear-gradient(rgba(201,191,174,.35),rgba(201,191,174,0));
  overflow:hidden;
}
.hint-rail i{
  position:absolute;left:0;top:0;width:1px;height:18px;
  background:var(--cinnabar-2);
  animation:railRun 2.2s ease-in-out infinite;
}
@keyframes railRun{0%{top:-20px;}100%{top:58px;}}
@keyframes hintIn{from{opacity:0;}to{opacity:1;}}

/* ===========================================================
   水墨过渡带
   =========================================================== */
.bridge{
  position:relative;
  min-height:96svh;
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(var(--ink-deep) 0%, #2a231d 32%, #6f6353 66%, var(--paper) 100%);
  overflow:hidden;
}
.bridge-ink{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%) scale(.2);
  width:min(90vw,1000px);aspect-ratio:1;border-radius:50%;
  background:radial-gradient(circle, rgba(28,25,23,.55) 0%, rgba(28,25,23,.18) 42%, rgba(28,25,23,0) 70%);
  filter:blur(18px);
  opacity:0;
}
.bridge-text{
  position:relative;z-index:2;
  display:flex;align-items:center;gap:clamp(14px,2.4vw,30px);
  color:#efe7db;
  font-size:clamp(13px,1.5vw,20px);
  letter-spacing:.34em;
  text-shadow:0 2px 22px rgba(0,0,0,.6);
}
.bridge-year{font-weight:600;}
.bridge-sep{width:clamp(30px,6vw,80px);height:1px;background:rgba(239,231,219,.5);}
.bridge-place{opacity:.82;}

/* ===========================================================
   ACT II  揭晓 + 人物小传
   =========================================================== */
.act-reveal{
  position:relative;
  background:var(--paper);
  padding:clamp(60px,9vh,120px) 0 clamp(70px,11vh,150px);
}
.act-reveal::before{
  content:"";position:absolute;left:0;right:0;top:0;height:40vh;
  background:linear-gradient(rgba(111,99,83,.22),rgba(244,239,230,0));
  pointer-events:none;
}

.reveal-grid{
  position:relative;
  width:min(1240px,92vw);margin:0 auto;
  display:grid;
  grid-template-columns:minmax(280px,42%) 1fr;
  gap:clamp(30px,5vw,80px);
  align-items:start;
}

.portrait-col{position:sticky;top:12vh;}
.portrait{position:relative;margin:0;}
.portrait img{
  width:100%;height:auto;
  mix-blend-mode:multiply;
  filter:contrast(1.04) saturate(1.02);
  -webkit-mask-image:linear-gradient(to bottom,#000 78%,rgba(0,0,0,0) 100%);
          mask-image:linear-gradient(to bottom,#000 78%,rgba(0,0,0,0) 100%);
}
/* 朱砂印章 */
.seal{
  position:absolute;right:6%;bottom:8%;
  width:62px;height:62px;
  display:grid;grid-template-columns:1fr 1fr;place-items:center;
  background:var(--cinnabar);color:#f7f1e6;
  border-radius:3px;
  font-size:20px;font-weight:600;line-height:1;
  box-shadow:0 6px 22px rgba(158,43,37,.32);
  transform:rotate(-4deg);
  opacity:.94;
}

.bio-col{padding-top:clamp(10px,4vh,48px);}
.bio-title{
  font-size:clamp(24px,3.2vw,40px);
  font-weight:600;letter-spacing:.06em;
  color:var(--ink);
  margin-bottom:clamp(24px,3.4vh,42px);
}

.bio-quote{
  margin:0 0 clamp(28px,3.6vh,44px);
  padding-left:clamp(16px,2vw,28px);
  border-left:2px solid var(--cinnabar);
}
.bio-quote .guwen{
  font-size:clamp(17px,1.85vw,25px);
  line-height:2;
  color:#5b4a35;
  font-weight:600;
  letter-spacing:.05em;
}
.bio-quote cite{
  display:block;margin-top:14px;
  font-style:normal;font-size:13px;letter-spacing:.24em;color:var(--muted);
}

.bio-body{
  font-size:clamp(15px,1.12vw,17px);
  line-height:2.15;
  color:#3b332b;
  max-width:44em;
  text-align:justify;
  margin-bottom:clamp(30px,4vh,52px);
}

.bio-facts{display:flex;flex-wrap:wrap;gap:0 clamp(28px,4vw,56px);}
.bio-facts li{
  display:flex;flex-direction:column;gap:6px;
  padding:14px 0;
  border-top:1px solid rgba(90,80,68,.28);
  min-width:150px;
}
.fact-k{font-size:11px;letter-spacing:.32em;color:var(--muted);}
.fact-v{font-size:15px;font-weight:600;color:var(--ink);letter-spacing:.04em;}

/* ===========================================================
   通用：区块标题
   =========================================================== */
.section-head{
  width:min(1240px,92vw);margin:0 auto clamp(40px,6vh,72px);
  text-align:center;
}
.sec-no{
  display:inline-block;margin-bottom:14px;
  font-size:12px;letter-spacing:.5em;color:var(--cinnabar);
}
.section-head h2{
  font-size:clamp(24px,3.4vw,42px);
  letter-spacing:.06em;margin-bottom:14px;
}
.section-head p{
  font-size:14px;color:var(--muted);letter-spacing:.1em;
}

/* ===========================================================
   治水纪事 · 分镜叙事
   =========================================================== */
.story{padding:clamp(70px,10vh,140px) 0 0;background:var(--paper);}

.story-hero{
  position:relative;overflow:hidden;border-radius:4px;
  width:min(1240px,92vw);margin:0 auto clamp(56px,9vh,110px);
  box-shadow:0 26px 60px rgba(28,25,23,.18);
}
.story-hero img{width:100%;height:auto;display:block;}
.story-hero::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(200deg, rgba(15,13,12,0) 42%, rgba(15,13,12,.74) 100%);
}
.hero-caption{
  position:absolute;left:clamp(20px,4vw,56px);bottom:clamp(18px,3.5vw,44px);
  z-index:2;color:#efe7db;max-width:36em;
}
.hero-tag{
  display:inline-block;font-size:11px;letter-spacing:.44em;color:#d0776d;
  margin-bottom:10px;
}
.hero-title{
  font-size:clamp(22px,3vw,40px);font-weight:900;letter-spacing:.14em;
  margin-bottom:8px;
}
.hero-desc{font-size:clamp(12.5px,1vw,14.5px);line-height:2;color:rgba(239,231,219,.82);letter-spacing:.08em;}

.story-chapter{width:min(1240px,92vw);margin:0 auto clamp(56px,9vh,110px);}
.chapter-head{
  display:flex;align-items:baseline;gap:18px;flex-wrap:wrap;
  margin-bottom:clamp(20px,3.4vh,36px);
}
.chapter-no{font-size:12px;letter-spacing:.4em;color:var(--cinnabar);}
.chapter-head h3{font-size:clamp(20px,2.4vw,30px);letter-spacing:.16em;}
.chapter-head p{font-size:13px;color:var(--muted);letter-spacing:.12em;margin-left:auto;}

.story-grid{
  display:grid;grid-template-columns:repeat(3,1fr);
  gap:clamp(16px,2.4vw,32px);
}
.story-card{margin:0;}
.story-card .frame{
  overflow:hidden;border-radius:3px;
  box-shadow:0 14px 34px rgba(28,25,23,.14);
}
.story-card img{
  width:100%;aspect-ratio:16/9;object-fit:cover;display:block;
  transition:transform .9s var(--ease);
}
.story-card:hover img{transform:scale(1.05);}
.story-card figcaption{padding-top:14px;}
.story-card .no{
  display:inline-block;margin-right:12px;
  font-size:11px;letter-spacing:.4em;color:var(--cinnabar);
}
.story-card strong{font-size:16px;letter-spacing:.08em;}
.story-card em{
  display:block;font-style:normal;margin-top:4px;
  font-size:12.5px;line-height:1.95;color:var(--muted);letter-spacing:.04em;
}

/* ===========================================================
   影像章节 · 视频占位
   =========================================================== */
.film{
  padding:clamp(70px,10vh,140px) 0;
  background:linear-gradient(var(--paper) 0%, var(--paper-2) 100%);
}
.video-slot{
  width:min(1080px,92vw);margin:0 auto;
  aspect-ratio:16/9;
  background:#14120f;
  border:1px solid rgba(158,43,37,.35);
  border-radius:4px;
  overflow:hidden;
  position:relative;
  box-shadow:0 30px 70px rgba(28,25,23,.28);
}
.video-slot-inner{
  position:absolute;inset:0;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:16px;text-align:center;padding:24px;
  color:#a99f90;
}
/* 视频就绪后填充整个 16:9 容器；文件缺失时该元素始终 hidden */
.film-video{
  position:absolute;inset:0;
  width:100%;height:100%;
  object-fit:cover;background:#0d0b09;
  outline:none;
}
.video-slot-inner[hidden],
.film-video[hidden]{display:none !important;}
.vp-badge{
  font-size:10px;letter-spacing:.5em;color:var(--cinnabar-2);
  border:1px solid rgba(192,69,58,.45);padding:5px 12px;border-radius:2px;
}
.vp-icon{width:64px;height:64px;fill:none;stroke:#8e8375;stroke-width:2;stroke-linejoin:round;}
.vp-title{font-size:clamp(18px,2vw,28px);color:#e4dbc9;letter-spacing:.16em;font-weight:600;}
.vp-desc{font-size:12.5px;line-height:2;color:#7e7466;letter-spacing:.08em;}
.vp-scan{
  position:absolute;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(192,69,58,.9),transparent);
  animation:scanMove 4.5s linear infinite;
}
@keyframes scanMove{0%{top:0;opacity:0;}10%{opacity:1;}90%{opacity:1;}100%{top:100%;opacity:0;}}

/* ===========================================================
   工程展示
   =========================================================== */
.works{padding:clamp(80px,11vh,150px) 0 clamp(60px,8vh,110px);background:var(--paper-2);}

.work-list{
  width:min(1240px,92vw);margin:0 auto;
  display:flex;flex-direction:column;gap:clamp(30px,5vh,64px);
}
.work-card{
  display:grid;grid-template-columns:1fr minmax(240px,42%);
  gap:clamp(24px,4vw,64px);align-items:center;
  background:var(--paper);
  border:1px solid rgba(90,80,68,.18);
  border-radius:4px;
  padding:clamp(28px,4vw,56px);
  box-shadow:0 18px 46px rgba(28,25,23,.10);
}
.work-card.reverse{grid-template-columns:minmax(240px,42%) 1fr;}
.work-card.reverse .work-text{order:2;}
.work-card.reverse .work-visual{order:1;}

.work-no{
  display:inline-block;font-size:12px;letter-spacing:.5em;
  color:var(--cinnabar);margin-bottom:10px;
}
.work-text h3{
  font-size:clamp(22px,2.6vw,34px);letter-spacing:.06em;margin-bottom:8px;
}
.work-tag{
  font-size:13px;letter-spacing:.22em;color:var(--muted);margin-bottom:18px;
}
.work-desc{
  font-size:15px;line-height:2.05;color:#3b332b;text-align:justify;margin-bottom:18px;
}
.work-points li{
  position:relative;padding-left:18px;font-size:14px;color:#544a40;line-height:2;
}
.work-points li::before{
  content:"";position:absolute;left:0;top:.85em;
  width:6px;height:6px;background:var(--cinnabar);border-radius:50%;opacity:.75;
}

.work-visual svg{width:100%;height:auto;}
.work-visual .rv{fill:none;stroke:#8d9aa2;stroke-width:14;stroke-linecap:round;opacity:.35;}
.work-visual .wk{fill:none;stroke:var(--stone);stroke-width:9;stroke-linecap:round;stroke-linejoin:round;}
.work-visual .mt{fill:#8d8579;opacity:.5;}
.work-visual .ac{fill:none;stroke:var(--cinnabar);stroke-width:3;stroke-dasharray:6 6;}
.work-visual .dot{fill:var(--cinnabar);}
.work-visual text{
  font-family:var(--font-serif);font-size:13px;fill:var(--muted);letter-spacing:.1em;
}

.motto{
  width:min(900px,92vw);margin:clamp(50px,8vh,100px) auto 0;
  text-align:center;padding-top:clamp(34px,5vh,60px);
  border-top:1px solid rgba(90,80,68,.28);
}
.motto-main{
  font-size:clamp(26px,4vw,52px);font-weight:900;
  letter-spacing:.22em;color:var(--ink);margin-bottom:16px;
}
.motto-sub{font-size:13.5px;letter-spacing:.16em;color:var(--muted);}

/* ===========================================================
   数据
   =========================================================== */
.numbers{
  padding:clamp(70px,10vh,130px) 0;
  background:var(--ink-deep);color:#efe7db;
}
.num-grid{
  width:min(1240px,92vw);margin:0 auto;
  display:grid;grid-template-columns:repeat(4,1fr);
  gap:clamp(20px,3vw,40px);
}
.num-item{
  display:flex;flex-direction:column;gap:10px;align-items:center;
  padding:14px 8px;
  border-left:1px solid rgba(239,231,219,.14);
}
.num-item:first-child{border-left:0;}
.num-v{
  font-size:clamp(34px,5vw,68px);font-weight:900;line-height:1;
  color:#f2e9d9;letter-spacing:.02em;
  font-variant-numeric:tabular-nums;
}
.num-v .sfx{color:var(--cinnabar-2);}
.num-k{font-size:12px;letter-spacing:.22em;color:#9d9284;text-align:center;}

/* ===========================================================
   结尾
   =========================================================== */
.outro{
  padding:clamp(90px,14vh,180px) 0;
  background:linear-gradient(var(--ink-deep) 0%, #241f1b 100%);
  color:#efe7db;text-align:center;
}
.outro-lead{font-size:14px;letter-spacing:.5em;color:#9d9284;margin-bottom:18px;}
.outro-main{
  font-size:clamp(30px,5.6vw,76px);font-weight:900;letter-spacing:.14em;
  margin-bottom:26px;
}
.outro-sub{
  width:min(680px,90vw);margin:0 auto;
  font-size:14.5px;line-height:2.2;color:#a99f90;letter-spacing:.08em;
}
.outro-brand{
  margin-top:clamp(44px,7vh,80px);
  display:flex;flex-direction:column;align-items:center;gap:12px;
}
.brand-line{
  width:min(220px,40vw);height:1px;
  background:linear-gradient(90deg,transparent,rgba(239,231,219,.4),transparent);
}
.brand-name{
  font-size:clamp(20px,2.4vw,30px);font-weight:900;letter-spacing:.4em;
  color:#f2e9d9;text-indent:.4em;
}
.brand-sub{font-size:12px;letter-spacing:.2em;color:#9d9284;}

/* ===========================================================
   页脚
   =========================================================== */
.site-foot{background:#14120f;color:#8d8375;padding:clamp(40px,6vh,70px) 0;}
.foot-inner{width:min(1240px,92vw);margin:0 auto;text-align:center;}
.foot-title{font-size:15px;letter-spacing:.34em;color:#c9bfae;margin-bottom:16px;}
.foot-note{font-size:12px;line-height:2.1;letter-spacing:.06em;margin-bottom:14px;}
.foot-copy{font-size:11px;letter-spacing:.1em;opacity:.6;}

/* ===========================================================
   滚动进入动画（JS 加 .in）
   =========================================================== */
.reveal{
  opacity:0;transform:translateY(34px);
  transition:opacity 1s var(--ease),transform 1s var(--ease);
}
.reveal.in{opacity:1;transform:none;}

/* GSAP 不可用时，保证内容可见 */
html.no-gsap .reveal{transition:none;}

@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;transition-duration:.01ms !important;}
  .reveal{opacity:1;transform:none;}
}

/* ===========================================================
   分镜讲解弹窗
   =========================================================== */
.story-modal{
  position:fixed;inset:0;z-index:120;
  display:flex;align-items:center;justify-content:center;
  visibility:hidden;opacity:0;
  transition:opacity .45s var(--ease),visibility 0s linear .45s;
}
.story-modal.open{
  visibility:visible;opacity:1;
  transition:opacity .45s var(--ease);
}
.sm-backdrop{
  position:absolute;inset:0;
  background:rgba(10,9,8,.82);
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
}
.sm-panel{
  position:relative;z-index:2;
  width:min(1020px,92vw);max-height:86vh;max-height:86svh;
  display:grid;grid-template-columns:1.08fr 1fr;
  background:#f4efe6;border-radius:4px;overflow:hidden;
  box-shadow:0 40px 110px rgba(0,0,0,.55);
  transform:translateY(34px) scale(.97);
  transition:transform .5s var(--ease);
}
.story-modal.open .sm-panel{transform:none;}

.sm-close{
  position:absolute;top:10px;right:12px;z-index:5;
  width:40px;height:40px;border:0;border-radius:50%;
  background:rgba(18,16,14,.55);color:#f4efe6;
  font-size:22px;line-height:1;cursor:pointer;
  transition:background .3s var(--ease),transform .3s var(--ease);
}
.sm-close:hover{background:var(--cinnabar);transform:rotate(90deg);}

.sm-media{position:relative;min-height:320px;background:#181614;}
.sm-media img{
  position:absolute;inset:0;width:100%;height:100%;
  object-fit:cover;display:block;
}
.sm-seal{
  position:absolute;left:18px;bottom:18px;
  width:46px;height:46px;display:flex;align-items:center;justify-content:center;
  background:var(--cinnabar);color:#f6efe2;border-radius:3px;
  font-size:20px;font-weight:900;
  box-shadow:0 6px 18px rgba(0,0,0,.4);
  transform:rotate(-4deg);
}

.sm-body{
  padding:clamp(26px,4vh,44px) clamp(22px,3vw,40px);
  overflow-y:auto;
}
.sm-tag{
  display:inline-block;
  font-size:11px;letter-spacing:.42em;color:var(--cinnabar);
  border-bottom:1px solid rgba(158,43,37,.35);
  padding-bottom:8px;margin-bottom:14px;
}
.sm-title{
  font-size:clamp(22px,2.6vw,30px);font-weight:900;letter-spacing:.14em;
  color:#1c1917;margin-bottom:8px;
}
.sm-lead{
  font-size:13px;line-height:2;color:#6f665a;letter-spacing:.05em;
  padding-bottom:16px;margin-bottom:18px;
  border-bottom:1px dashed #d8cfbe;
}
.sm-block{margin-bottom:18px;}
.sm-block:last-child{margin-bottom:0;}
.sm-block h4{
  display:flex;align-items:center;gap:10px;
  font-size:13.5px;font-weight:600;letter-spacing:.18em;color:#1c1917;
  margin-bottom:8px;
}
.sm-block h4::before{
  content:"";width:14px;height:3px;background:var(--cinnabar);border-radius:2px;
}
.sm-block p{
  font-size:12.8px;line-height:2.05;color:#4e463c;letter-spacing:.04em;
}
.sm-foot{
  margin-top:20px;padding-top:14px;border-top:1px solid #e0d7c6;
  font-size:11px;letter-spacing:.14em;color:#a2977f;
}

/* 可点击提示：卡片 */
.story-card[data-story]{cursor:pointer;}
.story-card .frame{position:relative;}
.frame-plus{
  position:absolute;top:12px;right:12px;z-index:3;
  width:34px;height:34px;display:flex;align-items:center;justify-content:center;
  border-radius:50%;
  background:rgba(18,16,14,.55);color:#f4efe6;
  font-size:18px;font-weight:300;
  opacity:0;transform:scale(.6);
  transition:opacity .35s var(--ease),transform .35s var(--ease),background .35s var(--ease);
}
.story-card:hover .frame-plus,
.story-card:focus-visible .frame-plus{opacity:1;transform:scale(1);}
.story-card .frame-plus:hover{background:var(--cinnabar);}
.story-card:focus-visible{outline:2px solid var(--cinnabar);outline-offset:4px;}
.story-hero:focus-visible{outline:2px solid var(--cinnabar);outline-offset:4px;}

/* 全宽大图：常驻小提示 */
.hero-more{
  display:inline-block;margin-top:12px;
  font-size:11px;letter-spacing:.3em;color:rgba(239,231,219,.85);
  border:1px solid rgba(239,231,219,.35);border-radius:2px;
  padding:6px 14px;
  transition:background .35s var(--ease),border-color .35s var(--ease),color .35s var(--ease);
}
.story-hero{cursor:pointer;}
.story-hero:hover .hero-more{background:var(--cinnabar);border-color:var(--cinnabar);color:#fff;}

/* 弹窗滚动锁定 */
body.sm-lock{overflow:hidden;}

@media (max-width:900px){
  .sm-panel{grid-template-columns:1fr;max-height:88vh;max-height:88svh;overflow-y:auto;}
  .sm-media{min-height:200px;height:42vw;}
  .sm-media img{position:relative;}
  .sm-close{background:rgba(18,16,14,.72);}
  .frame-plus{opacity:1;transform:scale(1);width:30px;height:30px;font-size:16px;}
}

/* ===========================================================
   响应式
   =========================================================== */
@media (max-width:900px){
  .story-grid{grid-template-columns:1fr;gap:26px;}
  .chapter-head p{margin-left:0;width:100%;}
  .story-hero{margin-bottom:44px;}
  .hero-caption{left:16px;right:16px;bottom:14px;}

  .suspect-inner{grid-template-columns:1fr;justify-items:center;text-align:center;}
  .suspect-copy:first-child{padding-top:0;justify-content:center;}
  .suspect-copy:last-child{padding-bottom:0;justify-content:center;}
  .line-a,.line-b{max-width:none;text-align:center;}
  .silhouette{order:-1;}
  .silhouette img{height:38svh;}
  .act-suspect{padding:96px 0 88px;}

  .reveal-grid{grid-template-columns:1fr;gap:24px;}
  .portrait-col{position:static;}
  .portrait{max-width:62%;margin:0 auto;}
  .seal{width:48px;height:48px;font-size:16px;}

  .work-card,.work-card.reverse{grid-template-columns:1fr;}
  .work-card.reverse .work-text{order:1;}
  .work-card.reverse .work-visual{order:2;}
  .work-visual{max-width:420px;margin:0 auto;}

  .num-grid{grid-template-columns:repeat(2,1fr);gap:26px 12px;}
  .num-item:nth-child(odd){border-left:0;}
  .num-item{border-left:1px solid rgba(239,231,219,.14);}
  .num-item:nth-child(1),.num-item:nth-child(2){border-left:0;}

  .topbar{gap:12px;}
  .topbar-sub{display:none;}
}

/* ===========================================================
   背景音乐开关
   =========================================================== */
.music-btn{
  position:fixed;right:clamp(16px,3vw,36px);bottom:clamp(16px,3vw,32px);z-index:110;
  display:flex;align-items:center;gap:9px;
  padding:9px 14px 9px 10px;
  background:rgba(18,16,14,.72);
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
  border:1px solid rgba(239,231,219,.22);
  border-radius:999px;
  color:#f4efe6;font-family:var(--font-serif);
  cursor:pointer;
  transition:background .35s var(--ease),border-color .35s var(--ease),transform .35s var(--ease);
}
.music-btn:hover{background:rgba(158,43,37,.85);border-color:transparent;}
.music-btn:active{transform:scale(.95);}
.music-btn:focus-visible{outline:2px solid var(--cinnabar);outline-offset:3px;}

.music-disc{
  width:26px;height:26px;flex:none;
  display:flex;align-items:center;justify-content:center;
  border-radius:50%;
  animation:discSpin 5s linear infinite;
  animation-play-state:paused;
}
.music-disc svg{width:26px;height:26px;}
.md-core{fill:#f4efe6;}
.md-ring{fill:none;stroke:rgba(244,239,230,.55);stroke-width:1.4;}
.music-btn.is-playing .music-disc{animation-play-state:running;}

.music-note{
  font-size:13px;line-height:1;
  opacity:.85;transform:translateY(-1px);
}
.music-state{
  font-size:11px;letter-spacing:.22em;
  opacity:.8;white-space:nowrap;
}
.music-btn.is-paused .music-note{opacity:.4;}
.music-btn.is-paused .music-state::after{content:"";}

/* 静音预热中：等待首次交互，音符轻微呼吸提示"可以点我" */
.music-btn.is-idle .music-note{opacity:.5;animation:musicBlink 2.6s ease-in-out infinite;}

/* 缓冲中：唱片加速旋转 + 文字呼吸，给用户即时反馈 */
.music-btn.is-loading{pointer-events:none;}
.music-btn.is-loading .music-disc{
  animation:discSpin 1.1s linear infinite;
  animation-play-state:running;
}
.music-btn.is-loading .md-core{opacity:.5;}
.music-btn.is-loading .music-state{
  opacity:.6;
  animation:musicBlink 1s ease-in-out infinite;
}

@keyframes discSpin{to{transform:rotate(360deg);}}
@keyframes musicBlink{0%,100%{opacity:.35;}50%{opacity:.9;}}

@media (max-width:900px){
  .music-state{display:none;}
  .music-btn{padding:10px;}
}