/* =========================================================
   乐鱼赛场 · /assets/site.css
   共享外壳：reset / tokens / 中文排版 / 头部 / 页脚 / 组件
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}

body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
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}
input,textarea,select{font:inherit}

/* ---------- 2. Tokens ---------- */
:root{
  --c-ink:#0B1B33;
  --c-ink-soft:#12294A;
  --c-line:#1E3A5F;
  --c-coral:#FF6B4A;
  --c-coral-soft:#FFB59F;
  --c-coral-ink:#C13A1B;
  --c-yellow:#FFD24A;
  --c-green:#2FBF71;
  --c-mist:#F4F7FB;
  --c-graphite:#101418;
  --c-muted:#7C90AB;
  --c-white:#FFFFFF;

  --font-display:"PingFang SC","Arial Narrow","Helvetica Neue",Impact,system-ui,sans-serif;
  --font-serif:"Songti SC","Source Han Serif SC","Noto Serif CJK SC",Georgia,serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;

  --sp-1:8px;
  --sp-2:16px;
  --sp-3:24px;
  --sp-4:32px;
  --sp-5:48px;
  --sp-6:64px;
  --sp-7:96px;

  --shell-max:1400px;
  --shell-pad:clamp(20px,4vw,64px);
  --header-h:88px;

  --ease:cubic-bezier(.2,.7,.2,1);
  --dur:260ms;

  --glow-coral:0 0 0 1px rgba(255,107,74,.28),0 0 22px rgba(255,107,74,.10);
  --glow-line:0 0 0 1px rgba(30,58,95,.9);
}

/* ---------- 3. 基础中文排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.8;
  letter-spacing:.01em;
  color:var(--c-mist);
  background:var(--c-ink);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.04;
  letter-spacing:-.02em;
}
h1{font-size:clamp(40px,7vw,96px);line-height:.95}
h2{font-size:clamp(26px,3.6vw,44px)}
h3{font-size:clamp(20px,2.2vw,26px);line-height:1.2}
h4{font-size:18px;line-height:1.3}

p+p{margin-top:1.2em}
strong{font-weight:700;color:var(--c-white)}

::selection{background:var(--c-coral);color:var(--c-ink)}

:focus-visible{outline:2px solid var(--c-yellow);outline-offset:3px}
.skip-link:focus-visible{outline-color:var(--c-ink)}

.u-mono{font-family:var(--font-mono);letter-spacing:.06em}
.u-serif{font-family:var(--font-serif);letter-spacing:.02em}

/* ---------- 4. 布局容器与网格 ---------- */
.shell{
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  padding-inline:var(--shell-pad);
}

.section{padding-block:clamp(48px,7vw,96px)}
.section--tight{padding-block:clamp(32px,4vw,56px)}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--sp-3);
}

.band{
  background:var(--c-ink-soft);
  border-top:1px solid var(--c-line);
  border-bottom:1px solid var(--c-line);
}

.light-zone{background:var(--c-mist);color:var(--c-graphite)}
.light-zone .section-title,
.light-zone h1,
.light-zone h2,
.light-zone h3{color:var(--c-graphite)}
.light-zone .eyebrow{color:var(--c-coral-ink)}
.light-zone .lede{color:#31435C}
.light-zone .prose{color:#22313F}
.light-zone .crumbs{color:#5B6E86}
.light-zone .crumbs [aria-current="page"]{color:var(--c-graphite)}

/* ---------- 5. 章节头 / 引言 / 正文 ---------- */
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:var(--sp-3);
  padding-bottom:20px;
  margin-bottom:var(--sp-4);
  border-bottom:1px solid var(--c-line);
}
.light-zone .section-head{border-bottom-color:#CBD7E5}

.eyebrow{
  display:block;
  margin-bottom:12px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--c-coral);
}

.section-title{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(26px,3.4vw,44px);
  line-height:1.05;
  letter-spacing:-.02em;
  color:var(--c-mist);
}

.lede{
  font-family:var(--font-serif);
  font-size:clamp(18px,1.6vw,22px);
  line-height:1.65;
  letter-spacing:.02em;
  max-width:38ch;
  color:rgba(244,247,251,.84);
}

.prose{max-width:68ch;font-size:17px;line-height:1.8}
.prose p+p{margin-top:1.2em}
.prose h3{margin-top:var(--sp-5);margin-bottom:var(--sp-2)}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:12px 20px;
  border:1px solid transparent;
  border-radius:0;
  font-family:var(--font-body);
  font-size:15px;
  font-weight:700;
  letter-spacing:.02em;
  line-height:1.2;
  white-space:nowrap;
  cursor:pointer;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.btn-primary{
  background:var(--c-coral);
  color:var(--c-ink);
  box-shadow:0 0 0 1px rgba(255,107,74,.4),0 0 18px rgba(255,107,74,.18);
}
.btn-primary:hover{background:var(--c-coral-soft);box-shadow:0 0 0 1px rgba(255,181,159,.7)}
.btn-ghost{
  background:transparent;
  color:var(--c-coral-soft);
  border-color:var(--c-line);
}
.btn-ghost:hover{border-color:var(--c-coral);color:var(--c-white)}
.btn-quiet{background:var(--c-mist);color:var(--c-graphite)}
.btn-quiet:hover{background:var(--c-white)}
.btn-sm{padding:8px 14px;font-size:13px}
.btn-arrow::after{content:"→";font-family:var(--font-mono);font-size:14px}

/* ---------- 7. 标签 / 状态 / 数字 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 8px;
  border:1px solid currentColor;
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.5;
  letter-spacing:.06em;
}
.tag--coral{color:var(--c-coral);box-shadow:var(--glow-coral)}
.tag--yellow{color:var(--c-yellow)}
.tag--green{color:var(--c-green)}
.tag--muted{color:var(--c-muted)}

.status-dot{
  display:inline-block;
  width:6px;
  height:6px;
  border-radius:50%;
  background:currentColor;
  box-shadow:0 0 6px currentColor;
}

.round-num{
  display:block;
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(72px,16vw,180px);
  line-height:.82;
  letter-spacing:-.05em;
  color:var(--c-coral);
}

/* 分号微标签：hover / focus 展开一行说明 */
.semi-tag{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:4px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--c-yellow);
  border-bottom:1px dashed rgba(255,210,74,.5);
  cursor:help;
  transition:transform 180ms var(--ease),color 180ms var(--ease);
}
.semi-tag:hover,
.semi-tag:focus-visible{transform:translateY(-4px);color:var(--c-coral-soft);border-bottom-color:var(--c-coral-soft)}
.semi-tag-note{
  position:absolute;
  left:0;
  bottom:calc(100% + 8px);
  z-index:30;
  min-width:200px;
  max-width:260px;
  padding:8px 12px;
  background:var(--c-graphite);
  color:var(--c-mist);
  border:1px solid var(--c-line);
  font-family:var(--font-body);
  font-size:13px;
  line-height:1.6;
  letter-spacing:0;
  opacity:0;
  transform:translateY(4px);
  pointer-events:none;
  transition:opacity 180ms var(--ease),transform 180ms var(--ease);
}
.semi-tag:hover .semi-tag-note,
.semi-tag:focus-visible .semi-tag-note,
.semi-tag:focus-within .semi-tag-note{opacity:1;transform:translateY(-2px)}

/* ---------- 8. 面板 / 错位卡片 / 阵容条带 ---------- */
.panel{
  background:var(--c-ink-soft);
  border:1px solid var(--c-line);
  padding:var(--sp-3);
}
.panel--glow{box-shadow:var(--glow-coral)}

.offset-card{
  position:relative;
  background:var(--c-ink-soft);
  border:1px solid var(--c-line);
  padding:var(--sp-3);
}
.offset-card::before{
  content:"";
  position:absolute;
  left:0;
  top:0;
  width:44px;
  height:3px;
  background:var(--c-coral);
}
.offset-card--down{transform:translateY(24px)}

.lineup-strip{
  display:flex;
  flex-wrap:wrap;
  border:1px solid var(--c-line);
  background:var(--c-ink-soft);
}
.lineup-item{
  flex:1 1 168px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  min-height:44px;
  padding:10px 16px;
  border-right:1px solid var(--c-line);
  font-size:14px;
}
.lineup-item:last-child{border-right:0}
.lineup-item:nth-child(even){background:rgba(11,27,51,.55)}

/* ---------- 9. 图片容器（页面阶段放图用） ---------- */
.media-frame{
  position:relative;
  display:grid;
  place-items:center;
  aspect-ratio:16 / 9;
  overflow:hidden;
  border:1px solid var(--c-line);
  background:
    linear-gradient(180deg,rgba(30,58,95,.5),rgba(11,27,51,.92)),
    repeating-linear-gradient(90deg,var(--c-line) 0 1px,transparent 1px 64px),
    repeating-linear-gradient(0deg,var(--c-line) 0 1px,transparent 1px 64px),
    var(--c-ink-soft);
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame__label{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--c-muted);
  text-align:center;
  padding:0 16px;
}
.media-frame--3x2{aspect-ratio:3 / 2}
.media-frame--4x3{aspect-ratio:4 / 3}
.media-frame--1x1{aspect-ratio:1 / 1}
.media-frame--wide{aspect-ratio:21 / 9}

/* ---------- 10. 面包屑 ---------- */
.crumbs{
  padding-block:16px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--c-muted);
}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.crumbs li{display:flex;align-items:center;gap:8px}
.crumbs li+li::before{content:"/";color:var(--c-line)}
.crumbs a{transition:color 160ms var(--ease)}
.crumbs a:hover{color:var(--c-coral-soft)}
.crumbs [aria-current="page"]{color:var(--c-mist)}

/* ---------- 11. 跳转链接 ---------- */
.skip-link{
  position:absolute;
  left:16px;
  top:-120px;
  z-index:220;
  display:inline-block;
  padding:10px 18px;
  background:var(--c-yellow);
  color:var(--c-graphite);
  font-size:14px;
  font-weight:700;
  transition:top 180ms var(--ease);
}
.skip-link:focus{top:8px}

/* ---------- 12. 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:120;
  background:rgba(11,27,51,.97);
  border-bottom:1px solid var(--c-line);
  color:var(--c-mist);
}

.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:var(--sp-4);
  width:100%;
  max-width:var(--shell-max);
  min-height:var(--header-h);
  margin-inline:auto;
  padding-inline:var(--shell-pad);
  transition:min-height var(--dur) var(--ease);
}

.brand-block{
  display:flex;
  align-items:center;
  gap:var(--sp-2);
  min-width:0;
}

.brand{display:flex;align-items:center;gap:12px;min-width:0}

.brand-mark{
  display:grid;
  place-items:center;
  width:40px;
  height:40px;
  flex:0 0 auto;
  background:var(--c-coral);
  color:var(--c-ink);
  font-family:var(--font-mono);
  font-size:16px;
  font-weight:700;
  letter-spacing:0;
  clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%);
  transition:width var(--dur) var(--ease),height var(--dur) var(--ease),font-size var(--dur) var(--ease);
}

.brand-text{display:flex;flex-direction:column;min-width:0}

.brand-name{
  font-family:var(--font-display);
  font-size:20px;
  font-weight:800;
  line-height:1.15;
  letter-spacing:.04em;
  transition:font-size var(--dur) var(--ease);
}

.brand-tagline{
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.6;
  letter-spacing:.16em;
  color:var(--c-muted);
  white-space:nowrap;
}

.coord-tag{
  display:flex;
  align-items:center;
  gap:8px;
  padding-left:16px;
  border-left:1px solid var(--c-line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--c-muted);
  white-space:nowrap;
}
.coord-dot{
  width:6px;
  height:6px;
  background:var(--c-green);
  box-shadow:0 0 8px rgba(47,191,113,.8);
}

.nav-block{display:flex;align-items:center;gap:var(--sp-2)}

.site-nav{display:flex;align-items:center;gap:var(--sp-2)}

.nav-list{display:flex;align-items:center;gap:2px}

.nav-link{
  position:relative;
  display:block;
  padding:10px 14px;
  border-bottom:2px solid transparent;
  font-size:15px;
  line-height:1.4;
  color:rgba(244,247,251,.78);
  transition:color 160ms var(--ease),border-color 160ms var(--ease);
}
.nav-link:hover{color:var(--c-white);border-bottom-color:var(--c-line)}
.nav-link[aria-current="page"]{
  color:var(--c-coral);
  border-bottom-color:var(--c-coral);
}

.nav-aux{display:flex;align-items:center;gap:12px}
.nav-aux-link{display:none}
.nav-foot-note{display:none}

.header-cta{flex:0 0 auto;padding:10px 18px;font-size:14px}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 12px;
  border:1px solid var(--c-line);
  background:rgba(18,41,74,.7);
  color:var(--c-mist);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  transition:border-color 160ms var(--ease),color 160ms var(--ease);
}
.nav-toggle:hover{border-color:var(--c-coral);color:var(--c-coral)}
.nav-toggle-icon{position:relative;display:block;width:18px;height:12px}
.nav-toggle-icon span{
  position:absolute;
  left:0;
  width:100%;
  height:2px;
  background:currentColor;
  transition:transform 200ms var(--ease),opacity 160ms var(--ease);
}
.nav-toggle-icon span:nth-child(1){top:0}
.nav-toggle-icon span:nth-child(2){top:5px}
.nav-toggle-icon span:nth-child(3){top:10px}
.site-header[data-open] .nav-toggle-icon span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle-icon span:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle-icon span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

.scroll-progress{
  position:absolute;
  left:0;
  bottom:-1px;
  width:100%;
  height:2px;
  background:linear-gradient(90deg,var(--c-coral),var(--c-yellow));
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform 80ms linear;
}

.mobile-entry{display:none}

/* 收窄态（桌面） */
@media (min-width:961px){
  .site-header.is-collapsed .header-inner{min-height:56px}
  .site-header.is-collapsed .brand-mark{width:32px;height:32px;font-size:13px}
  .site-header.is-collapsed .brand-name{font-size:17px}
  .site-header.is-collapsed .brand-tagline,
  .site-header.is-collapsed .coord-tag{display:none}
  .site-header.is-collapsed .nav-link{padding:8px 12px;font-size:14px}
}

/* ---------- 13. 返回顶部 / 章节目录 / 入场 ---------- */
.to-top{
  position:fixed;
  right:24px;
  bottom:24px;
  z-index:110;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:2px;
  width:52px;
  height:52px;
  background:var(--c-ink-soft);
  border:1px solid var(--c-line);
  color:var(--c-mist);
  opacity:0;
  visibility:hidden;
  transform:translateY(8px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),
             visibility 0s linear var(--dur),border-color 160ms var(--ease),color 160ms var(--ease);
}
.to-top.is-visible{opacity:1;visibility:visible;transform:none;transition-delay:0s}
.to-top:hover{border-color:var(--c-coral);color:var(--c-coral)}
.to-top-icon{font-family:var(--font-mono);font-size:16px;line-height:1}
.to-top-text{font-family:var(--font-mono);font-size:9px;letter-spacing:.16em;color:var(--c-muted)}

.toc-rail{
  position:fixed;
  right:24px;
  top:50%;
  z-index:90;
  display:none;
  flex-direction:column;
  gap:10px;
  transform:translateY(-50%);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  text-align:right;
}
.toc-rail a{
  color:var(--c-muted);
  padding-right:10px;
  border-right:1px solid var(--c-line);
  transition:color 160ms var(--ease),border-color 160ms var(--ease);
}
.toc-rail a:hover{color:var(--c-coral-soft)}
.toc-rail a.is-active{color:var(--c-coral);border-right-color:var(--c-coral)}

@media (min-width:1200px){
  .toc-rail{display:flex}
}

[data-reveal]{transition:opacity 320ms var(--ease),transform 320ms var(--ease)}
html.has-js [data-reveal]{opacity:0;transform:translateY(12px)}
html.has-js [data-reveal].is-in{opacity:1;transform:none}
html.has-js [data-reveal][data-delay="1"]{transition-delay:80ms}
html.has-js [data-reveal][data-delay="2"]{transition-delay:160ms}
html.has-js [data-reveal][data-delay="3"]{transition-delay:240ms}

/* ---------- 14. 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--c-ink);
  border-top:1px solid var(--c-line);
  color:var(--c-mist);
  overflow:hidden;
}

.footer-inner{
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  padding:clamp(40px,6vw,72px) var(--shell-pad) 24px;
}

.footer-top{
  display:grid;
  grid-template-columns:minmax(240px,1.05fr) 2fr;
  gap:clamp(32px,5vw,64px);
  padding-bottom:40px;
  border-bottom:1px solid var(--c-line);
}

.footer-brand-name{
  font-family:var(--font-display);
  font-size:24px;
  font-weight:800;
  letter-spacing:.04em;
  line-height:1.2;
}

.footer-brand-desc{
  margin-top:12px;
  max-width:34ch;
  font-size:15px;
  line-height:1.75;
  color:var(--c-muted);
}

.footer-chips{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-top:20px;
}

.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:var(--sp-4);
}

.footer-col-title{
  padding-bottom:10px;
  margin-bottom:16px;
  border-bottom:1px solid var(--c-line);
  font-family:var(--font-serif);
  font-size:16px;
  line-height:1.5;
  letter-spacing:.08em;
  color:var(--c-coral-soft);
}

.footer-list li+li{margin-top:10px}

.footer-list a{
  font-size:14px;
  line-height:1.7;
  color:rgba(244,247,251,.72);
  word-break:break-word;
  transition:color 160ms var(--ease);
}
.footer-list a:hover{color:var(--c-coral)}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:var(--sp-3);
  padding-top:24px;
}

.footer-meta{
  font-family:var(--font-mono);
  font-size:13px;
  line-height:1.9;
  letter-spacing:.02em;
  color:var(--c-muted);
}

.footer-contact-line{color:rgba(244,247,251,.7)}
.footer-legal-line{color:var(--c-muted)}
.footer-copy{color:var(--c-muted)}

.footer-round{
  display:flex;
  align-items:flex-end;
  gap:10px;
  font-family:var(--font-mono);
}
.footer-round-label{
  font-size:11px;
  letter-spacing:.2em;
  color:var(--c-muted);
  padding-bottom:8px;
}
.footer-round-num{
  font-size:clamp(48px,7vw,88px);
  font-weight:700;
  line-height:.78;
  color:transparent;
  -webkit-text-stroke:1px rgba(255,107,74,.6);
  text-stroke:1px rgba(255,107,74,.6);
}

/* ---------- 15. 响应式 ---------- */
@media (max-width:1280px){
  .nav-aux{display:none}
}

@media (max-width:1120px){
  .nav-link{padding:10px 10px;font-size:14px}
  .brand-tagline{display:none}
  .coord-tag{display:none}
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
}

@media (max-width:960px){
  :root{--header-h:64px}

  .header-inner{gap:12px}

  .nav-toggle{display:inline-flex}
  .header-cta{display:none}

  .site-nav{
    position:fixed;
    inset:var(--header-h) 0 0 0;
    z-index:125;
    display:flex;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:24px var(--shell-pad) 104px;
    background:linear-gradient(180deg,#0B1B33 0%,#0B1B33 58%,#12294A 100%);
    border-top:1px solid var(--c-line);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-8px);
    transition:opacity 220ms var(--ease),transform 220ms var(--ease),visibility 0s linear 220ms;
  }
  .site-header[data-open] .site-nav{
    opacity:1;
    visibility:visible;
    transform:none;
    transition-delay:0s;
  }

  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    border-top:1px solid var(--c-line);
  }
  .nav-list li{border-bottom:1px solid var(--c-line)}

  .nav-link{
    display:flex;
    align-items:center;
    justify-content:space-between;
    padding:18px 4px;
    font-size:18px;
    font-weight:700;
    border-bottom:0;
  }
  .nav-link::after{
    content:"→";
    font-family:var(--font-mono);
    font-size:14px;
    color:var(--c-muted);
  }
  .nav-link[aria-current="page"]{
    padding-left:12px;
    box-shadow:inset 3px 0 0 var(--c-coral);
  }

  .nav-aux{
    display:flex;
    flex-direction:column;
    align-items:flex-start;
    gap:16px;
    margin-top:28px;
  }
  .nav-aux-link{display:inline-flex}
  .nav-foot-note{
    display:block;
    font-family:var(--font-mono);
    font-size:12px;
    letter-spacing:.14em;
    color:var(--c-muted);
  }

  html.is-nav-open{overflow:hidden}

  .mobile-entry{
    position:fixed;
    left:0;
    right:0;
    bottom:0;
    z-index:130;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    height:48px;
    padding:0 20px;
    background:var(--c-coral);
    color:var(--c-ink);
    border-top:1px solid rgba(11,27,51,.25);
    font-size:15px;
    font-weight:700;
  }
  .mobile-entry-label{letter-spacing:.02em}
  .mobile-entry-meta{
    font-family:var(--font-mono);
    font-size:12px;
    letter-spacing:.12em;
    opacity:.72;
  }

  .site-footer{padding-bottom:48px}
  .to-top{right:16px;bottom:64px;width:46px;height:46px}

  .footer-top{grid-template-columns:1fr;gap:32px}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
  .footer-bottom{align-items:flex-start}
  .footer-round{align-self:flex-end}
}

@media (max-width:640px){
  body{font-size:16px;line-height:1.75}
  .grid-12{grid-template-columns:1fr;gap:var(--sp-2)}
  .offset-card--down{transform:none}
  .footer-cols{grid-template-columns:1fr}
  .lineup-item{flex:1 1 100%;border-right:0;border-bottom:1px solid var(--c-line)}
  .lineup-item:last-child{border-bottom:0}
  .section-head{gap:16px}
  .toc-rail{display:none}
}

/* ---------- 16. 降低动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
  html.has-js [data-reveal]{transform:none}
  .offset-card--down{transform:none}
  .semi-tag:hover,
  .semi-tag:focus-visible{transform:none}
}