/* ---------- 01 设计变量 ---------- */
:root{
  --ink:#0B2B24;
  --ink-2:#123B31;
  --moss:#1E5246;
  --paper:#F4EFE3;
  --paper-2:#E8DFC9;
  --paper-card:#FAF6EC;
  --gold:#D9A441;
  --gold-bright:#E4B155;
  --amber:#B9762A;
  --line:#7FA893;
  --body:#2B2B26;
  --body-soft:#4A4A42;
  --muted:#6E7A72;
  --red:#C9553D;
  --serif:"Source Han Serif SC","Noto Serif SC","Songti SC","SimSun",serif;
  --sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --mono:"IBM Plex Mono","SFMono-Regular",Consolas,"Courier New",monospace;
  --wrap:1280px;
  --pad:clamp(20px,4vw,48px);
  --header-h:78px;
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- 02 reset 与中文排版 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--sans);
  font-size:17px;
  line-height:1.75;
  color:var(--body);
  background-color:var(--paper);
  background-image:
    radial-gradient(circle at 10% -12%,rgba(217,164,65,.13),transparent 46%),
    radial-gradient(circle at 92% 2%,rgba(11,43,36,.07),transparent 42%);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,figure,dl,dd{margin:0}
ul[class],ol[class]{list-style:none;margin:0;padding:0}
img{max-width:100%;display:block}
a{color:inherit}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
:focus-visible{outline:2px solid var(--gold);outline-offset:2px;border-radius:2px}
::selection{background:var(--gold);color:var(--ink)}

/* ---------- 03 跳过导航 ---------- */
.skip-link{
  position:absolute;left:16px;top:-72px;z-index:140;
  padding:10px 18px;border-radius:4px;
  background:var(--gold);color:var(--ink);
  font-size:14px;font-weight:600;text-decoration:none;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:12px}

/* ---------- 04 页头 ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:var(--ink);
  color:var(--paper);
  border-bottom:1px solid rgba(127,168,147,.28);
  box-shadow:0 10px 30px rgba(11,43,36,.18);
}
.header-inner{
  display:flex;align-items:center;gap:clamp(12px,2.5vw,40px);
  width:100%;max-width:var(--wrap);margin:0 auto;
  padding:0 var(--pad);min-height:var(--header-h);
}
.brand{
  display:flex;align-items:center;gap:12px;
  padding:10px 0;text-decoration:none;color:inherit;flex:0 0 auto;
}
.brand-seal{
  width:42px;height:42px;flex:0 0 auto;
  display:grid;place-items:center;
  font-family:var(--serif);font-size:20px;font-weight:700;line-height:1;
  color:var(--gold);
  border:1.5px solid rgba(217,164,65,.8);
  border-radius:3px;
  background:linear-gradient(150deg,rgba(217,164,65,.16),rgba(185,118,42,.05));
  box-shadow:inset 0 0 0 2px var(--ink),inset 0 0 0 3px rgba(217,164,65,.35);
  transition:color .18s var(--ease),border-color .18s var(--ease),background .18s var(--ease);
}
.brand:hover .brand-seal,.brand:focus-visible .brand-seal{
  color:var(--gold-bright);border-color:var(--gold-bright);
  background:linear-gradient(150deg,rgba(217,164,65,.3),rgba(185,118,42,.12));
}
.brand-seal--sm{width:34px;height:34px;font-size:16px}
.brand-text{display:grid;gap:2px}
.brand-name{
  font-family:var(--serif);font-size:19px;font-weight:600;
  letter-spacing:.02em;line-height:1.2;color:var(--paper);
}
.brand-meta{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--line);line-height:1.4;
}

/* ---------- 05 导航（桌面：左右分置） ---------- */
.site-nav{
  display:flex;align-items:center;
  margin-left:auto;
  padding-left:clamp(12px,2vw,28px);
  border-left:1px solid rgba(127,168,147,.3);
}
.nav-list{display:flex;align-items:center;gap:clamp(2px,1vw,14px)}
.nav-link{
  display:grid;gap:1px;padding:9px 10px 8px;
  text-decoration:none;color:rgba(244,239,227,.92);
  border-bottom:2px solid transparent;border-radius:2px 2px 0 0;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.nav-index{
  font-family:var(--mono);font-size:10px;letter-spacing:.14em;
  color:var(--line);transition:color .18s var(--ease);
}
.nav-text{font-size:15px;letter-spacing:.02em;line-height:1.3;white-space:nowrap}
.nav-link:hover{background:rgba(30,82,70,.6)}
.nav-link:hover .nav-index,.nav-link:focus-visible .nav-index{color:var(--gold)}
.nav-link[aria-current="page"]{border-bottom-color:var(--gold);color:#FFFDF6}
.nav-link[aria-current="page"] .nav-index{color:var(--gold)}
.nav-note{display:none;font-size:13.5px;color:var(--line);line-height:1.7}

/* 移动抽屉按钮 */
.nav-toggle{
  display:none;align-items:center;gap:9px;margin-left:auto;
  padding:9px 13px;border:1px solid rgba(217,164,65,.55);border-radius:4px;
  color:var(--paper);font-size:13px;letter-spacing:.1em;
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--gold);color:var(--gold-bright)}
.nav-toggle-bars{display:grid;gap:5px;width:16px}
.nav-toggle-bars span{display:block;height:1.5px;background:var(--gold);transition:transform .18s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:first-child{transform:translateY(3.25px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:last-child{transform:translateY(-3.25px) rotate(-45deg)}

/* 阅读进度（页头底缘） */
.scroll-progress{
  position:absolute;left:0;bottom:-1px;height:2px;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--gold),var(--amber));
  pointer-events:none;
}

/* ---------- 06 页脚 ---------- */
.site-footer{
  background:var(--ink-2);
  color:var(--paper);
  border-top:1px solid rgba(217,164,65,.35);
}
.footer-inner{
  width:100%;max-width:var(--wrap);margin:0 auto;
  padding:clamp(44px,6vw,80px) var(--pad) 26px;
}
.footer-masthead{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,340px);
  gap:clamp(20px,3vw,44px);align-items:start;
}
.footer-brand{display:flex;align-items:center;gap:14px}
.footer-brand-name{
  font-family:var(--serif);font-size:20px;font-weight:600;
  letter-spacing:.02em;line-height:1.3;
}
.footer-tagline{
  margin-top:8px;font-family:var(--serif);
  font-size:clamp(17px,1.8vw,23px);line-height:1.5;
  color:rgba(244,239,227,.86);
}
.footer-save-card{
  position:relative;
  background:var(--paper);color:var(--body);
  border-left:3px solid var(--gold);border-radius:6px;
  padding:20px 22px 22px;
  box-shadow:0 18px 40px rgba(0,0,0,.24);
}
.footer-save-kicker{
  font-family:var(--mono);font-size:11px;letter-spacing:.18em;
  color:var(--amber);text-transform:uppercase;
}
.footer-save-title{
  margin-top:6px;font-family:var(--serif);font-size:20px;font-weight:600;
  letter-spacing:-.01em;
}
.footer-save-note{
  margin-top:8px;font-size:14px;line-height:1.65;color:var(--body-soft);
}
.footer-save-card .btn{margin-top:16px}
.footer-columns{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(18px,3vw,40px);
  margin-top:clamp(28px,4vw,44px);padding-top:clamp(26px,3.5vw,38px);
  border-top:1px solid rgba(127,168,147,.24);
}
.footer-col-title{
  display:flex;align-items:center;gap:10px;
  font-family:var(--sans);font-size:13px;font-weight:600;
  letter-spacing:.16em;color:var(--gold);
}
.footer-col-title::before{
  content:"";width:5px;height:5px;flex:0 0 auto;
  background:var(--gold);transform:rotate(45deg);
}
.footer-col ul{display:grid;gap:9px;margin-top:16px}
.footer-col a{
  font-size:15px;color:rgba(244,239,227,.78);text-decoration:none;
  border-bottom:1px solid transparent;padding-bottom:1px;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.footer-col a:hover,.footer-col a:focus-visible{
  color:var(--gold-bright);border-bottom-color:rgba(217,164,65,.6);
}
.footer-contact{
  display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);
  gap:clamp(22px,4vw,48px);
  margin-top:clamp(26px,4vw,40px);padding-top:clamp(24px,3.5vw,34px);
  border-top:1px solid rgba(127,168,147,.24);
}
.contact-list{display:grid;gap:16px}
.contact-item{display:grid;gap:3px}
.contact-label{
  font-family:var(--mono);font-size:11px;letter-spacing:.16em;
  color:var(--line);text-transform:uppercase;
}
.contact-value{
  font-size:15.5px;line-height:1.6;color:rgba(244,239,227,.92);
}
.contact-value--mono{font-family:var(--mono);font-size:14px;letter-spacing:.03em}
.contact-mail-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.copy-btn{
  padding:5px 12px;border:1px solid rgba(217,164,65,.6);border-radius:999px;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.1em;
  color:var(--gold);background:transparent;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.copy-btn:hover{background:var(--gold);color:var(--ink);border-color:var(--gold)}
.copy-btn:active{background:var(--amber);color:var(--ink)}
.copy-feedback{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;
  color:var(--gold-bright);
}
.footer-contact-note{
  font-size:13.5px;line-height:1.75;color:var(--line);
  border-left:2px solid rgba(217,164,65,.5);padding-left:14px;
}
.footer-legal{
  display:flex;flex-wrap:wrap;gap:12px 24px;justify-content:space-between;align-items:center;
  margin-top:clamp(24px,3vw,34px);padding-top:20px;
  border-top:1px solid rgba(127,168,147,.24);
  font-family:var(--mono);font-size:12px;letter-spacing:.04em;color:var(--line);
}
.footer-legal-links{display:flex;flex-wrap:wrap;gap:18px}
.footer-legal a{
  color:rgba(244,239,227,.72);text-decoration:none;
  border-bottom:1px solid transparent;transition:color .16s var(--ease),border-color .16s var(--ease);
}
.footer-legal a:hover,.footer-legal a:focus-visible{
  color:var(--gold-bright);border-bottom-color:rgba(217,164,65,.6);
}

/* ---------- 07 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 22px;border-radius:4px;border:1px solid transparent;
  font-size:15px;font-weight:500;line-height:1.4;text-decoration:none;
  transition:background-color .18s var(--ease),color .18s var(--ease),
             border-color .18s var(--ease),transform .18s var(--ease);
}
.btn--gold{
  background:linear-gradient(160deg,var(--gold),var(--amber));
  color:var(--ink);border-color:rgba(11,43,36,.16);
}
.btn--gold:hover{background:linear-gradient(160deg,var(--gold-bright),#C98232)}
.btn--gold:active{transform:translateY(1px)}
.btn--outline{border-color:rgba(11,43,36,.34);color:var(--ink)}
.btn--outline:hover{border-color:var(--ink);background:rgba(11,43,36,.06)}
.btn--ghost{border-color:rgba(217,164,65,.6);color:var(--paper)}
.btn--ghost:hover{border-color:var(--gold);color:var(--gold-bright);background:rgba(217,164,65,.08)}
.btn--sm{padding:9px 16px;font-size:13.5px}

/* ---------- 08 排版与版式 ---------- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--pad)}
.wrap--narrow{max-width:860px}
.section{padding-block:clamp(52px,8vw,116px)}
.section--ink{background:var(--ink);color:var(--paper)}
.section--paper-2{background:var(--paper-2)}
.section--ink .section-title,.section--ink .display,.section--ink .card-title{color:var(--paper)}
.split{
  display:grid;grid-template-columns:minmax(0,1.45fr) minmax(0,1fr);
  gap:clamp(22px,4vw,60px);align-items:start;
}
.split--reverse{grid-template-columns:minmax(0,1fr) minmax(0,1.45fr)}
.aside-rail{position:sticky;top:calc(var(--header-h) + 24px)}
.chapter{display:grid;grid-template-columns:auto minmax(0,1fr);gap:clamp(14px,2.5vw,36px);align-items:start}
.chapter-num{
  font-family:var(--serif);font-weight:700;line-height:.8;
  font-size:clamp(56px,9vw,132px);
  letter-spacing:-.02em;color:var(--gold);opacity:.3;
}
.chapter-num[data-reveal]{opacity:.3}
.chapter-num[data-reveal].is-visible{opacity:.4;transform:none}
.display{
  font-family:var(--serif);font-size:clamp(30px,4.4vw,56px);font-weight:700;
  line-height:1.16;letter-spacing:-.01em;
}
.section-title{
  font-family:var(--serif);font-size:clamp(25px,3vw,38px);font-weight:600;
  line-height:1.28;letter-spacing:-.01em;
}
.sub-title{
  font-family:var(--serif);font-size:clamp(19px,2vw,24px);font-weight:600;line-height:1.4;
}
.kicker{
  display:inline-block;font-family:var(--mono);font-size:12px;
  letter-spacing:.16em;color:var(--muted);text-transform:uppercase;
}
.kicker--gold{color:var(--amber)}
.lede{font-size:clamp(17px,1.6vw,19px);line-height:1.7;color:var(--body-soft)}
.body-text{font-size:17px;line-height:1.75;color:var(--body)}
.body-text + .body-text{margin-top:1em}
.mono{font-family:var(--mono);font-size:12.5px;letter-spacing:.04em}
.vertical-note{
  writing-mode:vertical-rl;font-size:12px;letter-spacing:.34em;
  color:var(--muted);line-height:1;user-select:none;
}
.section--ink .body-text,.section--ink .lede{color:rgba(244,239,227,.82)}

/* ---------- 09 展览标签 / 时间戳 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 10px 5px 12px;border-radius:2px;
  background:var(--paper-2);border-left:3px solid var(--gold);
  font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--ink);
}
.tag--on-ink{background:rgba(232,223,201,.12);color:var(--paper-2)}
.timestamp{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--mono);font-size:12px;letter-spacing:.04em;
  color:var(--muted);padding-bottom:1px;
  border-bottom:1px dashed rgba(127,168,147,.7);
}
.timestamp--on-ink{color:var(--line);border-bottom-color:rgba(217,164,65,.45)}

/* ---------- 10 卡片 / 索引 ---------- */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(238px,1fr));gap:20px}
.card{
  position:relative;display:block;height:100%;
  padding:22px 22px 24px;border-radius:6px;
  background:var(--paper-card);
  border:1px solid rgba(127,168,147,.55);
  color:inherit;text-decoration:none;
  transition:transform .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.card:hover,.card:focus-within{
  transform:translateY(-2px);border-color:var(--gold);
  box-shadow:0 12px 26px rgba(11,43,36,.12);
}
.card-title{
  font-family:var(--serif);font-size:18px;font-weight:600;line-height:1.4;color:var(--body);
}
.card-desc{margin-top:8px;font-size:15px;line-height:1.7;color:var(--body-soft)}
.card-foot{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  margin-top:18px;padding-top:12px;border-top:1px solid rgba(127,168,147,.35);
}
.card--banner{
  display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);
  gap:clamp(16px,3vw,36px);align-items:center;
  padding:clamp(22px,3vw,36px);border-radius:6px;
  background:var(--moss);color:var(--paper);
  border:1px solid rgba(217,164,65,.75);
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),border-color .18s var(--ease);
}
.card--banner:hover{transform:translateY(-2px);border-color:var(--gold);box-shadow:0 16px 34px rgba(11,43,36,.22)}
.card--banner .card-title{font-size:clamp(21px,2.4vw,28px);color:var(--paper)}
.card--banner .card-desc{color:rgba(244,239,227,.84)}
.panel--accent{
  padding:clamp(22px,3vw,34px);border-radius:6px;
  background:var(--moss);color:var(--paper);
  border:1px solid rgba(217,164,65,.45);
}
.panel--accent .card-title,.panel--accent .sub-title{color:var(--paper)}
.panel--accent .card-desc,.panel--accent .body-text{color:rgba(244,239,227,.85)}

/* ---------- 11 档案流 / 筛选 / 展开 ---------- */
.timeline{
  position:relative;margin:0;padding:0 0 0 26px;
  list-style:none;border-left:1px solid var(--line);
}
.timeline-item{position:relative;padding-bottom:30px}
.timeline-item:last-child{padding-bottom:0}
.timeline-item::before{
  content:"";position:absolute;left:-30px;top:7px;
  width:8px;height:8px;border-radius:50%;background:var(--gold);
  box-shadow:0 0 0 4px rgba(217,164,65,.16);
}
.timeline-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;flex-wrap:wrap}
.timeline-date{
  font-family:var(--mono);font-size:12px;letter-spacing:.06em;
  color:var(--amber);text-align:right;
}
.chip-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;border-radius:999px;
  border:1px solid rgba(127,168,147,.75);
  font-family:var(--mono);font-size:12.5px;letter-spacing:.06em;
  color:var(--body);background:transparent;
  transition:background-color .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease);
}
.chip:hover{border-color:var(--gold)}
.chip[aria-pressed="true"]{background:var(--gold);color:var(--ink);border-color:var(--gold)}
.chip--ghost{border-style:dashed;color:var(--muted)}
.expand{border-top:1px solid rgba(127,168,147,.5);padding:16px 0}
.expand summary{
  display:flex;align-items:baseline;justify-content:space-between;gap:16px;
  cursor:pointer;list-style:none;
  font-family:var(--serif);font-size:17.5px;font-weight:600;line-height:1.5;
}
.expand summary::-webkit-details-marker{display:none}
.expand summary::after{content:"+";font-family:var(--mono);font-size:18px;color:var(--gold);line-height:1}
.expand[open] summary::after{content:"−"}
.expand-body{padding-top:12px;font-size:16px;line-height:1.75;color:var(--body-soft)}
.expand[open] .expand-body{animation:fadeIn .12s var(--ease) both}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}

/* ---------- 12 面包屑 / 长文 / 图片容器 ---------- */
.breadcrumb{
  padding-block:16px 18px;
  font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--muted);
}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb a{
  color:var(--muted);text-decoration:none;
  border-bottom:1px solid transparent;padding-bottom:1px;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.breadcrumb a:hover{color:var(--amber);border-bottom-color:var(--amber)}
.breadcrumb-sep{color:rgba(127,168,147,.9)}
.breadcrumb [aria-current="page"]{color:var(--body)}
.prose{max-width:72ch}
.prose p + p{margin-top:1em}
.prose ul{list-style:disc;padding-left:1.2em;margin:1em 0}
.prose li + li{margin-top:.4em}
.img-frame{
  position:relative;margin:0;overflow:hidden;
  display:grid;place-items:center;
  aspect-ratio:16 / 10;border-radius:6px;
  border:1px solid rgba(127,168,147,.5);
  background:linear-gradient(150deg,var(--ink-2) 0%,var(--ink) 55%,var(--moss) 100%);
  color:rgba(244,239,227,.6);
  font-family:var(--mono);font-size:12px;letter-spacing:.12em;
}
.img-frame img{width:100%;height:100%;object-fit:cover;display:block}
.img-frame--wide{aspect-ratio:16 / 7}
.img-frame--tall{aspect-ratio:3 / 4}
.img-frame--square{aspect-ratio:1 / 1}
.figure-caption{
  margin-top:10px;font-family:var(--mono);font-size:12px;
  letter-spacing:.04em;color:var(--muted);line-height:1.6;
}

/* ---------- 13 显现 / 抽屉锁定 ---------- */
[data-reveal]{opacity:0;transform:translateY(10px);transition:opacity .22s var(--ease),transform .22s var(--ease)}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 14 响应式 ---------- */
@media (max-width:1100px){
  .footer-columns{grid-template-columns:repeat(2,minmax(0,1fr));row-gap:28px}
}
@media (max-width:960px){
  :root{--header-h:64px}
  html.nav-open,html.nav-open body{overflow:hidden}
  .brand-seal{width:36px;height:36px;font-size:17px}
  .brand-name{font-size:17px}
  .brand-meta{font-size:10.5px;letter-spacing:.06em}
  .nav-toggle{display:inline-flex}
  .site-nav{
    display:block;
    position:fixed;top:var(--header-h);right:0;bottom:0;
    width:min(88vw,340px);
    padding:22px var(--pad) 40px;
    background:var(--ink-2);
    border-left:1px solid rgba(127,168,147,.35);
    box-shadow:-24px 0 48px rgba(0,0,0,.3);
    overflow-y:auto;
    transform:translateX(102%);
    transition:transform .22s var(--ease);
    z-index:90;
  }
  .site-nav[data-open="true"]{transform:translateX(0)}
  .nav-list{display:grid;gap:0}
  .nav-item{border-bottom:1px solid rgba(127,168,147,.22)}
  .nav-link{
    grid-template-columns:auto minmax(0,1fr);align-items:baseline;gap:14px;
    padding:15px 4px;border-bottom:0;border-left:3px solid transparent;border-radius:0;
  }
  .nav-index{font-size:11px}
  .nav-text{font-size:17px;white-space:normal}
  .nav-link[aria-current="page"]{
    border-left-color:var(--gold);border-bottom-color:transparent;
    background:rgba(30,82,70,.55);
  }
  .nav-note{display:block;margin-top:20px;font-size:13px}
  .split,.split--reverse{grid-template-columns:minmax(0,1fr)}
  .card--banner{grid-template-columns:minmax(0,1fr)}
  .footer-masthead{grid-template-columns:minmax(0,1fr)}
  .footer-contact{grid-template-columns:minmax(0,1fr)}
  .footer-contact-note{border-left-width:2px}
  .aside-rail{position:static}
}
@media (max-width:720px){
  body{font-size:16.5px}
  .footer-columns{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .footer-legal{flex-direction:column;align-items:flex-start;gap:10px}
  .chapter{grid-template-columns:minmax(0,1fr)}
  .chapter-num{margin-bottom:-.08em}
  .vertical-note{display:none}
  .card-grid{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:460px){
  .brand-meta{display:none}
  .footer-columns{grid-template-columns:minmax(0,1fr)}
  .nav-toggle-label{display:none}
}

/* ---------- 15 降低动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.001ms !important;animation-duration:.001ms !important}
  [data-reveal]{opacity:1;transform:none}
  .chapter-num[data-reveal]{opacity:.4}
  .card:hover,.card:focus-within,.card--banner:hover{transform:none}
  .expand[open] .expand-body{animation:none}
  .scroll-progress{transition:none}
}