/* 结构化案例页：文字用真 HTML，图只承担视觉证据。
   两个案例页（等级增长系统 / 语音厅布局系统）共用这套骨架。 */
:root{
  --case-bg:#0d0d0f;
  --case-ink:#f5f5f4;
  --case-muted:#9a9a96;
  --case-line:rgba(255,255,255,.14);
  --case-card:rgba(255,255,255,.045);
  --case-max:1180px;
  --case-ease:cubic-bezier(.16,1,.3,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--case-bg)}
body{
  min-width:320px;margin:0;
  background:var(--case-bg);color:var(--case-ink);
  font-family:"D-DIN Numerals","Plus Jakarta Sans",-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  line-height:1.68;-webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit}
:focus-visible{outline:3px solid var(--case-accent,#6c5cff);outline-offset:4px}
.case-wrap{width:min(calc(100% - 44px),var(--case-max));margin-inline:auto}
.skip{
  position:fixed;left:18px;top:12px;z-index:60;padding:10px 14px;border-radius:10px;
  background:var(--case-ink);color:#111;font-size:14px;font-weight:700;text-decoration:none;
  transform:translateY(-160%);transition:transform .2s;
}
.skip:focus{transform:none}

/* ---------- 顶部信息条 ---------- */
.case-topbar{
  position:sticky;top:0;z-index:40;
  border-bottom:1px solid var(--case-line);
  background:color-mix(in srgb,var(--case-bg) 88%,transparent);
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
}
.case-topbar__inner{display:flex;align-items:center;gap:18px;min-height:64px}
.case-topbar__back{
  display:inline-flex;align-items:center;gap:8px;flex:none;
  padding:8px 15px;border:1px solid var(--case-line);border-radius:999px;
  color:var(--case-ink);font-size:13px;font-weight:750;text-decoration:none;
  transition:border-color .2s,transform .2s var(--case-ease);
}
.case-topbar__back:hover{border-color:var(--case-ink);transform:translateX(-3px)}
.case-topbar__meta{display:flex;align-items:baseline;gap:10px;min-width:0;font-size:13px}
.case-topbar__badge{
  flex:none;padding:3px 9px;border-radius:999px;
  background:var(--case-accent,#6c5cff);color:#fff;font-size:11px;font-weight:800;letter-spacing:.04em;
}
.case-topbar__title{overflow:hidden;color:var(--case-muted);text-overflow:ellipsis;white-space:nowrap}
.case-toc{display:flex;gap:20px;margin-left:auto;font-size:13px;font-weight:650}
.case-toc a{color:var(--case-muted);text-decoration:none;transition:color .2s}
.case-toc a:hover,.case-toc a.is-active{color:var(--case-ink)}

/* ---------- 封面 ---------- */
.case-hero{padding:clamp(64px,9vw,120px) 0 clamp(40px,5vw,64px)}
.case-hero__eyebrow{
  display:block;margin-bottom:20px;color:var(--case-accent,#6c5cff);
  font-size:12px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;
}
.case-hero h1{
  margin:0;max-width:19ch;
  font-size:clamp(34px,5.4vw,68px);font-weight:800;line-height:1.08;letter-spacing:-.045em;
}
.case-hero__lead{max-width:56ch;margin:22px 0 0;color:var(--case-muted);font-size:clamp(15px,1.5vw,18px)}
.case-tags{display:flex;flex-wrap:wrap;gap:9px;margin-top:26px;padding:0;list-style:none}
.case-tags li{
  padding:6px 13px;border:1px solid var(--case-line);border-radius:999px;
  color:var(--case-muted);font-size:12px;font-weight:700;
}

/* ---------- 角色卡：我负责什么 / 不负责什么 ---------- */
.role-card{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:1px;
  margin:clamp(32px,4vw,52px) 0 0;
  border:1px solid var(--case-line);border-radius:16px;
  background:var(--case-line);overflow:hidden;
}
.role-card__cell{padding:20px 22px 22px;background:var(--case-bg)}
.role-card__cell dt{
  margin-bottom:7px;color:var(--case-accent,#6c5cff);
  font-size:11px;font-weight:800;letter-spacing:.09em;text-transform:uppercase;
}
.role-card__cell dd{margin:0;font-size:14px;line-height:1.6}
.role-card__cell--out dd{color:var(--case-muted)}

/* ---------- 章节 ---------- */
.case-section{padding:clamp(56px,7vw,96px) 0 0;scroll-margin-top:84px}
.case-section__index{
  display:flex;align-items:center;gap:13px;margin-bottom:16px;
  color:var(--case-accent,#6c5cff);font-size:12px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;
}
.case-section__index::after{content:"";flex:1;max-width:64px;height:1px;background:currentColor;opacity:.5}
.case-section h2{
  margin:0;max-width:24ch;
  font-size:clamp(25px,3.3vw,42px);font-weight:800;line-height:1.14;letter-spacing:-.038em;
}
.case-section__body{max-width:66ch;margin-top:18px;color:#c9c9c5;font-size:clamp(14.5px,1.4vw,16.5px)}
.case-section__body p{margin:0 0 14px}
.case-section__body p:last-child{margin-bottom:0}
.case-section__body strong{color:var(--case-ink);font-weight:750}

/* 关键结论条 */
.case-callout{
  margin-top:24px;padding:18px 22px;
  border-left:3px solid var(--case-accent,#6c5cff);border-radius:0 12px 12px 0;
  background:var(--case-card);
}
.case-callout__label{
  display:block;margin-bottom:6px;color:var(--case-accent,#6c5cff);
  font-size:11px;font-weight:800;letter-spacing:.09em;text-transform:uppercase;
}
.case-callout p{margin:0;font-size:clamp(15px,1.6vw,18px);font-weight:700;line-height:1.5;letter-spacing:-.015em}

/* 图：视觉证据 */
.case-figure{margin:clamp(26px,3.4vw,42px) 0 0}
.case-figure img{width:100%;height:auto;border-radius:14px;background:#000}
.case-figure figcaption{margin-top:12px;color:var(--case-muted);font-size:12.5px;line-height:1.6}

/* 要点列表 */
.case-points{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px;margin-top:28px;padding:0;list-style:none}
.case-points li{padding:18px 20px 20px;border:1px solid var(--case-line);border-radius:14px;background:var(--case-card)}
.case-points strong{display:block;margin-bottom:6px;font-size:15px;font-weight:800;letter-spacing:-.01em}
.case-points span{color:var(--case-muted);font-size:13.5px;line-height:1.6}

/* 正文里的口径小字，跟在结论后面 */
.case-inline-note{color:var(--case-muted);font-size:.86em}

/* ---------- 数据：全部带口径 ---------- */
.metrics-note{
  margin:26px 0 0;padding:14px 18px;border:1px dashed var(--case-line);border-radius:12px;
  color:var(--case-muted);font-size:12.5px;line-height:1.65;
}
.metrics-note strong{color:#d6d6d2;font-weight:750}
.metric-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(215px,1fr));gap:16px;margin-top:26px}
.metric-card{padding:22px 22px 24px;border:1px solid var(--case-line);border-radius:16px;background:var(--case-card)}
.metric-card__value{
  display:block;font-size:clamp(29px,3.6vw,42px);font-weight:800;line-height:1.05;letter-spacing:-.04em;
  font-variant-numeric:tabular-nums;
}
.metric-card__name{display:block;margin-top:9px;font-size:14px;font-weight:700}
.metric-card__basis{display:block;margin-top:9px;padding-top:9px;border-top:1px solid var(--case-line);color:var(--case-muted);font-size:12px;line-height:1.6}

/* ---------- 结尾：可迁移判断 / 反思 ---------- */
.takeaway-list{display:grid;gap:14px;margin-top:28px;padding:0;list-style:none;counter-reset:tk}
.takeaway-list li{
  display:grid;grid-template-columns:34px minmax(0,1fr);gap:16px;
  padding:20px 22px;border:1px solid var(--case-line);border-radius:14px;background:var(--case-card);
}
.takeaway-list li::before{
  counter-increment:tk;content:counter(tk);
  display:flex;align-items:center;justify-content:center;width:30px;height:30px;
  border-radius:50%;background:var(--case-accent,#6c5cff);color:#fff;
  font-size:13px;font-weight:800;font-variant-numeric:tabular-nums;
}
.takeaway-list strong{display:block;margin-bottom:5px;font-size:15.5px;font-weight:800;letter-spacing:-.015em}
.takeaway-list span{color:var(--case-muted);font-size:13.5px;line-height:1.65}

.retro{
  margin-top:clamp(40px,5vw,64px);padding:clamp(26px,3.4vw,40px);
  border:1px solid var(--case-line);border-radius:18px;background:var(--case-card);
}
.retro h2{margin:0;font-size:clamp(21px,2.4vw,29px);font-weight:800;letter-spacing:-.03em}
.retro__list{display:grid;gap:18px;margin:22px 0 0;padding:0}
.retro__list div{padding-top:16px;border-top:1px solid var(--case-line)}
.retro__list dt{margin-bottom:6px;font-size:14.5px;font-weight:800}
.retro__list dd{margin:0;color:var(--case-muted);font-size:13.5px;line-height:1.68}

/* ---------- 底部 ---------- */
.case-footer{margin-top:clamp(64px,8vw,110px);padding:36px 0 64px;border-top:1px solid var(--case-line)}
.case-footer__row{display:flex;flex-wrap:wrap;align-items:center;gap:18px;color:var(--case-muted);font-size:13px}
.case-footer__next{
  margin-left:auto;display:inline-flex;align-items:center;gap:9px;
  padding:11px 20px;border:1px solid var(--case-line);border-radius:999px;
  color:var(--case-ink);font-size:14px;font-weight:750;text-decoration:none;
  transition:border-color .2s,transform .25s var(--case-ease);
}
.case-footer__next:hover{border-color:var(--case-ink);transform:translateX(3px)}

@media(max-width:760px){
  .case-wrap{width:min(calc(100% - 32px),var(--case-max))}
  .case-toc{display:none}
  .case-topbar__title{max-width:44vw}
  .takeaway-list li{grid-template-columns:1fr;gap:10px}
  .case-figure img{border-radius:10px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition-duration:.01ms !important}
}