/* ============================================================
   百家平台乐 · 共享样式 /assets/site.css
   城市地标手册：框条导航 · 珠宝色分区 · 铭牌式排版
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root{
  --red:#B3261E;
  --red-bright:#E8776A;
  --wine:#6E1F1B;
  --ink:#141414;
  --warm:#6B645C;
  --teal:#0E6F6E;
  --teal-bright:#63C2B7;
  --deep:#0B3B3C;
  --indigo:#3A2E5A;
  --crane:#F6F2EA;
  --paper:#FFFDF8;
  --mist:#DCE8E4;
  --gold:#9A6A1F;

  --max:1320px;
  --gutter:clamp(20px,4vw,72px);
  --header-h:76px;
  --dock-h:64px;

  --r-sm:14px;
  --r-md:24px;
  --r-lg:32px;
  --r-pill:999px;

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

  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono","SFMono-Regular",ui-monospace,monospace;
}

/* ---------- 2. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{margin:0}
h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{list-style:none;padding:0}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ---------- 3. 基础与中文排版 ---------- */
body{
  font-family:var(--font-body);
  font-weight:400;
  font-size:17px;
  line-height:1.85;
  letter-spacing:.01em;
  color:var(--ink);
  background:var(--crane);
  overflow-wrap:break-word;
  word-break:normal;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
@media (min-width:1024px){ body{font-size:18px} }

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.14;
  letter-spacing:.06em;
  text-wrap:balance;
}
h1{font-size:clamp(2.3rem,5.4vw,4.6rem);line-height:1.05;letter-spacing:.1em}
h2{font-size:clamp(1.65rem,3.2vw,2.8rem);letter-spacing:.08em}
h3{font-size:clamp(1.2rem,2vw,1.6rem);line-height:1.4;letter-spacing:.05em}
h4{font-size:1.05rem;line-height:1.45;letter-spacing:.06em}

:focus-visible{outline:2px solid var(--teal);outline-offset:3px;border-radius:6px}
.band--deep :focus-visible,
.band--wine :focus-visible,
.band--indigo :focus-visible,
.site-footer :focus-visible{outline-color:var(--teal-bright)}

/* ---------- 4. 布局与分区 ---------- */
.wrap{
  width:100%;
  max-width:var(--max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(56px,8vw,112px)}
.section--tight{padding-block:clamp(32px,5vw,64px)}

.band{background:var(--paper)}
.band--paper{background:var(--paper)}
.band--mist{background:var(--mist)}
.band--deep{background:var(--deep);color:var(--crane)}
.band--wine{background:var(--wine);color:var(--crane)}
.band--indigo{background:var(--indigo);color:var(--crane)}
.band--deep .index-label,
.band--wine .index-label,
.band--indigo .index-label{color:var(--teal-bright)}
.band--deep .muted,
.band--wine .muted,
.band--indigo .muted{color:rgba(246,242,234,.72)}
.band--deep .prose a,
.band--wine .prose a,
.band--indigo .prose a{color:var(--teal-bright)}
.band--deep .rule,
.band--wine .rule,
.band--indigo .rule{background:rgba(246,242,234,.22)}

.grid{display:grid;gap:clamp(18px,2.6vw,36px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}

@media (max-width:900px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8{grid-column:span 12}
}
@media (max-width:620px){
  .grid--2,.grid--3,.grid--12{grid-template-columns:1fr}
}

.rule{height:1px;background:var(--mist);border:0;margin:0}
.muted{color:var(--warm)}
.panel{
  background:var(--paper);
  border:1px solid rgba(20,20,20,.07);
  border-radius:var(--r-lg);
  padding:clamp(22px,3vw,36px);
}

/* ---------- 5. 索引 / 章节 ---------- */
.index-label{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:.75rem;
  font-weight:500;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--teal);
}
.index-label::before{content:"";width:24px;height:1px;background:currentColor;flex:none}

.chapter-head{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:clamp(14px,3vw,40px);
  align-items:start;
  margin-bottom:clamp(24px,3.5vw,44px);
}
.chapter-num{
  font-family:var(--font-mono);
  font-weight:500;
  font-size:clamp(1.9rem,3.4vw,2.9rem);
  line-height:1;
  letter-spacing:.02em;
  color:var(--mist);
}
.band--deep .chapter-num,
.band--wine .chapter-num,
.band--indigo .chapter-num{color:rgba(246,242,234,.34)}

/* ---------- 6. 正文 ---------- */
.prose{max-width:100%}
.prose p{max-width:38em;margin-bottom:1.15em}
.prose p:last-child{margin-bottom:0}
.prose h2,.prose h3{margin-top:2em;margin-bottom:.55em}
.prose ul,.prose ol{max-width:38em;margin-bottom:1.15em;padding-left:1.15em;list-style:disc}
.prose ol{list-style:decimal}
.prose li{margin-bottom:.45em}
.prose a{
  color:var(--teal);
  text-decoration:underline;
  text-decoration-thickness:1px;
  text-underline-offset:4px;
  transition:color .2s var(--ease);
}
.prose a:hover{color:var(--red)}

/* ---------- 7. 按钮 / 胶囊 / 标签 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  min-height:48px;
  padding:12px 26px;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  font-family:var(--font-display);
  font-weight:700;
  font-size:.95rem;
  letter-spacing:.08em;
  line-height:1.2;
  cursor:pointer;
  transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),transform .22s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--red);color:var(--paper)}
.btn--primary:hover{background:var(--wine)}
.btn--ghost{border-color:var(--teal);color:var(--teal)}
.btn--ghost:hover{background:var(--teal);color:var(--crane)}
.btn--dark{background:var(--deep);color:var(--crane)}
.btn--dark:hover{background:var(--indigo)}

.link-arrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-weight:700;
  letter-spacing:.05em;
  color:var(--teal);
}
.link-arrow::after{
  content:"→";
  font-family:var(--font-mono);
  transition:transform .22s var(--ease);
}
.link-arrow:hover::after{transform:translateX(4px)}
.link-arrow:hover{color:var(--red)}

.pill{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 14px;
  border:1px solid var(--mist);
  border-radius:var(--r-pill);
  background:var(--paper);
  color:var(--warm);
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.12em;
  line-height:1.7;
  white-space:nowrap;
}
.pill--red{border-color:transparent;background:var(--red);color:var(--paper)}
.pill--teal{border-color:transparent;background:rgba(14,111,110,.12);color:var(--teal)}
.pill--gold{border-color:rgba(154,106,31,.42);background:rgba(154,106,31,.1);color:var(--gold)}
.pill--ghost{border-color:currentColor;background:transparent;color:inherit}

.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:8px 18px;
  border:1px solid var(--mist);
  border-radius:var(--r-pill);
  background:var(--paper);
  color:var(--warm);
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.1em;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.chip:hover{border-color:var(--teal);color:var(--teal)}
.chip[aria-pressed="true"]{background:var(--deep);border-color:var(--deep);color:var(--crane)}

/* ---------- 8. 手风琴 ---------- */
.sheet{border-bottom:1px solid var(--mist)}
.sheet > summary{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  min-height:56px;
  padding:16px 0;
  cursor:pointer;
  list-style:none;
  font-family:var(--font-display);
  font-weight:700;
  font-size:1rem;
  letter-spacing:.04em;
  line-height:1.5;
}
.sheet > summary::-webkit-details-marker{display:none}
.sheet > summary::after{
  content:"+";
  font-family:var(--font-mono);
  font-weight:500;
  color:var(--teal);
  font-size:1.15rem;
  flex:none;
}
.sheet[open] > summary::after{content:"–"}
.sheet-body{padding-bottom:20px;color:var(--warm);max-width:44em}
.sheet-body p{margin-bottom:.9em}

/* ---------- 9. 数据 ---------- */
.stat{display:grid;gap:4px}
.stat-value{
  font-family:var(--font-mono);
  font-weight:500;
  font-size:clamp(1.6rem,3vw,2.4rem);
  line-height:1.1;
  letter-spacing:.02em;
  color:var(--ink);
}
.band--deep .stat-value,
.band--wine .stat-value,
.band--indigo .stat-value{color:var(--crane)}
.stat-label{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.18em;
  color:var(--warm);
}
.band--deep .stat-label,
.band--wine .stat-label,
.band--indigo .stat-label{color:rgba(246,242,234,.68)}

/* ---------- 10. 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding-block:18px;
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.1em;
  color:var(--warm);
}
.breadcrumb li{display:inline-flex;align-items:center}
.breadcrumb li + li::before{content:"/";margin-right:8px;color:var(--mist)}
.breadcrumb a{color:var(--warm);transition:color .2s var(--ease)}
.breadcrumb a:hover{color:var(--red)}

/* ---------- 11. 图片容器基础 ---------- */
.figure{margin:0}
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid rgba(20,20,20,.07);
  border-radius:var(--r-lg);
  background:
    linear-gradient(135deg,rgba(220,232,228,.95) 0%,rgba(255,253,248,.95) 52%,rgba(14,111,110,.16) 100%);
}
.media-frame img,
.media-frame picture,
.media-frame > *{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  border-radius:inherit;
  box-shadow:inset 0 0 0 1px rgba(255,253,248,.4);
  pointer-events:none;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--portrait{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame--cut{border-radius:var(--r-lg) 4px var(--r-lg) 4px}
.media-caption{
  margin-top:12px;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.1em;
  color:var(--warm);
}
.band--deep .media-caption,
.band--wine .media-caption,
.band--indigo .media-caption{color:rgba(246,242,234,.66)}

/* ---------- 12. 头部框条 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--crane);
  border-bottom:1px solid var(--mist);
  transition:box-shadow .24s var(--ease);
}
.site-header[data-scrolled="true"]{box-shadow:0 12px 32px -26px rgba(20,20,20,.75)}
.header-inner{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:clamp(12px,2.4vw,36px);
  min-height:var(--header-h);
}

/* skip link */
.skip-link{
  position:absolute;
  left:clamp(12px,2vw,24px);
  top:-72px;
  z-index:200;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:10px 20px;
  border-radius:var(--r-pill);
  background:var(--deep);
  color:var(--crane);
  font-family:var(--font-mono);
  font-size:.8rem;
  letter-spacing:.12em;
  transition:top .2s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{top:10px}

/* 品牌门牌 */
.brand{display:inline-flex;align-items:center;gap:12px;min-height:44px}
.brand-mark{
  position:relative;
  display:grid;
  place-items:center;
  width:34px;
  height:34px;
  flex:none;
  border-radius:10px;
  background:var(--red);
  box-shadow:0 2px 0 rgba(110,31,27,.32);
}
.brand-mark::before{
  content:"";
  width:13px;
  height:13px;
  border:2px solid var(--crane);
  border-radius:3px;
}
.brand-mark::after{
  content:"";
  position:absolute;
  left:50%;
  bottom:6px;
  transform:translateX(-50%);
  width:11px;
  height:2px;
  border-radius:1px;
  background:var(--crane);
}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:1.02rem;
  letter-spacing:.16em;
  color:var(--ink);
}
.brand-sub{
  margin-top:3px;
  font-family:var(--font-mono);
  font-size:.64rem;
  letter-spacing:.2em;
  color:var(--warm);
}

/* 导航 */
.site-nav{justify-self:center;min-width:0}
.nav-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:center;
  gap:2px;
}
.nav-item{display:flex}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:7px;
  min-height:44px;
  padding:8px 13px;
  border-radius:var(--r-pill);
  color:var(--ink);
  font-size:.94rem;
  font-weight:500;
  letter-spacing:.05em;
  white-space:nowrap;
  transition:color .2s var(--ease),background .2s var(--ease);
}
.nav-link:hover{color:var(--teal);background:rgba(14,111,110,.07)}
.nav-link[aria-current="page"]{color:var(--red);font-weight:700}
.nav-link[aria-current="page"]::before{
  content:"";
  position:absolute;
  left:2px;
  top:50%;
  transform:translateY(-50%);
  width:2px;
  height:20px;
  border-radius:2px;
  background:var(--red);
}
.nav-index{
  font-family:var(--font-mono);
  font-size:.62rem;
  letter-spacing:.08em;
  color:var(--warm);
  transition:color .2s var(--ease);
}
.nav-label{letter-spacing:.05em}
.nav-link:hover .nav-index{color:var(--teal)}
.nav-link[aria-current="page"] .nav-index{color:var(--red)}

/* 右侧工具区 */
.header-tools{
  display:flex;
  align-items:center;
  gap:10px;
  justify-self:end;
}
.version-plate{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 12px;
  border:1px solid var(--mist);
  border-radius:var(--r-pill);
  background:var(--paper);
  color:var(--warm);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.08em;
  white-space:nowrap;
}
.version-dot{width:6px;height:6px;border-radius:50%;background:var(--red);flex:none}
.header-action{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:10px 20px;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  background:var(--red);
  color:var(--paper);
  font-family:var(--font-display);
  font-weight:700;
  font-size:.88rem;
  letter-spacing:.08em;
  white-space:nowrap;
  transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease);
}
.header-action:hover{background:var(--wine)}
.header-action--ghost{background:transparent;border-color:var(--teal);color:var(--teal)}
.header-action--ghost:hover{background:var(--teal);color:var(--crane)}

.nav-toggle{
  display:none;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
  width:46px;
  height:46px;
  flex:none;
  border:1px solid var(--mist);
  border-radius:14px;
  background:var(--paper);
}
.nav-toggle-bar{
  display:block;
  width:18px;
  height:2px;
  border-radius:2px;
  background:var(--ink);
  transition:transform .22s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child{transform:translateY(3.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:last-child{transform:translateY(-3.5px) rotate(-45deg)}

/* 底部双入口（仅移动端） */
.mobile-dock{display:none}

/* ---------- 13. 页脚 ---------- */
.site-footer{
  background:var(--deep);
  color:var(--crane);
  border-top:4px solid var(--red);
  padding-top:clamp(40px,6vw,84px);
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  align-items:end;
  gap:24px;
  padding-bottom:clamp(24px,4vw,40px);
  border-bottom:1px solid rgba(246,242,234,.18);
}
.footer-top-main{display:grid;gap:12px;justify-items:start}
.footer-mark{
  position:relative;
  display:block;
  width:28px;
  height:28px;
  border-radius:9px;
  background:var(--red);
}
.footer-mark::before{
  content:"";
  position:absolute;
  left:50%;
  top:50%;
  transform:translate(-50%,-50%);
  width:11px;
  height:11px;
  border:2px solid var(--crane);
  border-radius:3px;
}
.footer-wordmark{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(1.9rem,4.6vw,3.4rem);
  line-height:1;
  letter-spacing:.16em;
  color:var(--crane);
}
.footer-tagline{
  font-size:.95rem;
  letter-spacing:.14em;
  color:rgba(246,242,234,.68);
}
.footer-tagline--mono{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.16em;
}
.footer-top-side{display:grid;gap:10px;justify-items:end;text-align:right}

.footer-grid{
  display:grid;
  grid-template-columns:1.1fr 1.5fr .85fr .85fr;
  gap:clamp(22px,3vw,48px);
  padding-block:clamp(30px,4.5vw,60px);
}
.footer-col{min-width:0}
.footer-col-title{
  margin-bottom:14px;
  font-family:var(--font-display);
  font-weight:700;
  font-size:.82rem;
  letter-spacing:.2em;
  color:var(--crane);
}
.footer-col--anchor{
  border-left:3px solid var(--red);
  padding-left:clamp(16px,2vw,28px);
}
.footer-col--anchor .footer-col-title{color:var(--red-bright)}
.footer-list{display:grid;gap:8px}
.footer-list li{
  font-size:.95rem;
  line-height:1.8;
  color:rgba(246,242,234,.78);
}
.footer-list--mono li{
  font-family:var(--font-mono);
  font-size:.79rem;
  line-height:1.9;
  letter-spacing:.02em;
  overflow-wrap:anywhere;
}
.footer-note{
  font-family:var(--font-body);
  font-size:.8rem !important;
  line-height:1.75;
  color:rgba(246,242,234,.6) !important;
}
.footer-icp{
  font-family:var(--font-mono);
  font-size:.78rem !important;
  letter-spacing:.06em;
  color:rgba(246,242,234,.55) !important;
}
.footer-link{
  position:relative;
  display:inline-block;
  padding-block:2px;
  color:rgba(246,242,234,.82);
  transition:color .2s var(--ease);
}
.footer-link::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:0;
  height:1px;
  background:var(--teal-bright);
  transition:width .22s var(--ease);
}
.footer-link:hover{color:var(--crane)}
.footer-link:hover::after{width:100%}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  padding-block:22px 30px;
  border-top:1px solid rgba(246,242,234,.16);
  font-family:var(--font-mono);
  font-size:.76rem;
  letter-spacing:.06em;
  color:rgba(246,242,234,.6);
}
.footer-copy,.footer-legal{margin:0}

/* ---------- 14. 阅读进度与显现 ---------- */
.read-progress{
  position:fixed;
  top:0;
  left:0;
  width:100%;
  height:3px;
  z-index:120;
  pointer-events:none;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--red) 0%,var(--wine) 58%,var(--teal) 100%);
  transition:transform .12s linear;
}
[data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- 15. 响应式 ---------- */
@media (max-width:1240px){
  .header-action--ghost{display:none}
}
@media (max-width:1080px){
  .header-action{display:none}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-top-side{justify-items:start;text-align:left}
}
@media (max-width:960px){
  :root{--header-h:64px}
  body{padding-bottom:calc(var(--dock-h) + 16px + env(safe-area-inset-bottom,0px))}
  .header-inner{grid-template-columns:minmax(0,1fr) auto;gap:12px}
  .site-nav{
    position:fixed;
    top:var(--header-h);
    left:0;
    right:0;
    z-index:79;
    max-height:calc(100vh - var(--header-h) - var(--dock-h));
    max-height:calc(100dvh - var(--header-h) - var(--dock-h));
    overflow-y:auto;
    padding:8px var(--gutter) 26px;
    background:var(--paper);
    border-bottom:1px solid var(--mist);
    box-shadow:0 24px 40px -34px rgba(20,20,20,.7);
    opacity:0;
    visibility:hidden;
    pointer-events:none;
    transform:translateY(-10px);
    transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s linear;
  }
  .site-nav[data-open="true"]{
    opacity:1;
    visibility:visible;
    pointer-events:auto;
    transform:none;
  }
  .nav-list{flex-direction:column;align-items:stretch;justify-content:flex-start;gap:0}
  .nav-item{border-bottom:1px solid var(--mist)}
  .nav-item:last-child{border-bottom:0}
  .nav-link{
    width:100%;
    justify-content:flex-start;
    gap:14px;
    min-height:56px;
    padding:14px 4px 14px 18px;
    border-radius:0;
    font-size:1.05rem;
    letter-spacing:.06em;
  }
  .nav-link:hover{background:rgba(14,111,110,.05)}
  .nav-link[aria-current="page"]::before{left:2px;height:24px}
  .nav-index{font-size:.72rem}
  .nav-toggle{display:flex}
  .mobile-dock{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:8px;
    position:fixed;
    left:0;
    right:0;
    bottom:0;
    z-index:90;
    padding:8px 12px calc(8px + env(safe-area-inset-bottom,0px));
    background:var(--paper);
    border-top:1px solid var(--mist);
  }
  .dock-link{
    display:flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    min-height:48px;
    border-radius:var(--r-pill);
    background:var(--red);
    color:var(--paper);
    font-family:var(--font-display);
    font-weight:700;
    font-size:.92rem;
    letter-spacing:.1em;
    transition:background .2s var(--ease);
  }
  .dock-link--dark{background:var(--deep)}
  .dock-link:hover{background:var(--wine)}
  .dock-link--dark:hover{background:var(--indigo)}
  .dock-arrow{font-family:var(--font-mono);font-size:.8rem;opacity:.72}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
}
@media (max-width:760px){
  .footer-top{grid-template-columns:1fr;align-items:start}
  .footer-top-side{justify-items:start;text-align:left}
}
@media (max-width:620px){
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-col--anchor{padding-left:16px}
  .chapter-head{grid-template-columns:1fr;gap:8px}
  .footer-bottom{font-size:.72rem}
}
@media (max-width:420px){
  .version-plate{display:none}
  .brand-name{font-size:.96rem;letter-spacing:.12em}
  .brand-sub{letter-spacing:.14em}
}

/* ---------- 16. 动效偏好 ---------- */
@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  [data-reveal]{opacity:1;transform:none}
  .read-progress{transition:none}
  .nav-toggle-bar{transition:none}
}