/* =============================================================
   必一体育SPORT CN — /assets/site.css
   共享外壳：reset / tokens / 中文排版 / 刊头 / 页脚 / 基础组件
   ============================================================= */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html,body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,pre{margin:0;padding:0}
ul,ol{list-style:none}
img,picture,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:0}
button{cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
summary{list-style:none;cursor:pointer}
summary::-webkit-details-marker{display:none}
:focus-visible{outline:2px solid var(--grass-bright);outline-offset:2px;border-radius:1px}

/* ---------- 2. tokens ---------- */
:root{
  --deep:#0B2A1F;
  --grass:#1E7A45;
  --grass-bright:#34C46B;
  --lamp:#F2C53D;
  --alert:#F4652A;
  --slate:#7C93A8;
  --indigo:#1B2A4A;
  --wine:#7A1F35;
  --paper:#EAF3EC;
  --ink:#16211C;
  --line:rgba(124,147,168,.34);
  --line-soft:rgba(124,147,168,.18);
  --line-strong:rgba(124,147,168,.62);
  --grid-light:rgba(234,243,236,.07);
  --grid-dark:rgba(22,33,28,.055);
  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --maxw:1280px;
  --gutter:clamp(16px,4vw,40px);
  --radius:2px;
  --ease:cubic-bezier(.2,.8,.2,1);
  --dur:240ms;
  --dur-slow:320ms;
}

/* ---------- 3. base & 中文排版 ---------- */
html{scroll-behavior:smooth;scroll-padding-top:150px;-webkit-text-size-adjust:100%}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{font-family:var(--font-display);font-weight:900;line-height:1.06;letter-spacing:-.02em;color:inherit}
h1{font-size:clamp(34px,5.4vw,64px)}
h2{font-size:clamp(26px,3.6vw,44px)}
h3{font-size:clamp(20px,2.2vw,26px)}
h4{font-size:18px;letter-spacing:0}
p+p{margin-top:1em}
strong{font-weight:700}
hr{border:0;border-top:1px solid var(--line);margin-block:32px}
::selection{background:var(--grass-bright);color:var(--ink)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:0}
.index-label{
  display:inline-flex;align-items:center;gap:.4em;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:var(--slate);transition:color var(--dur) var(--ease);
}
.index-label::before{content:"—";color:currentColor;opacity:.75}
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}

/* ---------- 4. 分区与底色节奏 ---------- */
.section{position:relative;padding-block:clamp(48px,7vw,88px)}
.section--tight{padding-block:clamp(32px,4.5vw,56px)}
.section--paper{background:var(--paper);color:var(--ink)}
.section--deep{background:var(--deep);color:var(--paper)}
.section--indigo{background:var(--indigo);color:var(--paper)}
.section--grass{background:var(--grass);color:#fff}
.section--wine{background:var(--wine);color:#fff}
.section--deep::before,
.section--indigo::before,
.section--grass::before,
.section--wine::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(var(--grid-light) 1px,transparent 1px),linear-gradient(90deg,var(--grid-light) 1px,transparent 1px);
  background-size:24px 24px;
}
.section--paper::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(var(--grid-dark) 1px,transparent 1px),linear-gradient(90deg,var(--grid-dark) 1px,transparent 1px);
  background-size:24px 24px;
}
.section>*{position:relative;z-index:1}
.cut-bottom{clip-path:polygon(0 0,100% 0,100% calc(100% - 40px),0 100%)}
.cut-top{clip-path:polygon(0 40px,100% 0,100% 100%,0 100%)}

/* ---------- 5. 章节标记 / 揭示 ---------- */
.chapter-head{position:relative;display:flex;flex-wrap:wrap;align-items:baseline;gap:14px;padding-left:20px;margin-bottom:clamp(20px,3vw,36px)}
.chapter-head::before{
  content:"";position:absolute;left:0;top:.28em;width:3px;height:1.1em;
  background:var(--slate);opacity:.5;
  transition:height var(--dur) var(--ease),background-color var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
[data-chapter].is-active .chapter-head::before{height:1.7em;opacity:1;background:var(--grass-bright)}
[data-chapter].is-active .index-label{color:var(--grass-bright)}
.chapter-head__title{
  font-family:var(--font-display);font-weight:900;letter-spacing:-.02em;
  font-size:clamp(26px,3.6vw,44px);line-height:1.06;
  padding-bottom:.12em;border-bottom:2px solid var(--grass);
}
.chapter-head__note{font-size:15px;color:var(--slate);max-width:46ch}
.section--deep .chapter-head__note,.section--indigo .chapter-head__note,.section--grass .chapter-head__note,.section--wine .chapter-head__note{color:rgba(234,243,236,.72)}
[data-reveal]{opacity:0;transform:translateY(16px);transition:opacity var(--dur-slow) var(--ease),transform var(--dur-slow) var(--ease)}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 6. 网格 ---------- */
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2.2vw,28px)}
.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}
.stagger{display:grid;gap:clamp(20px,3vw,32px)}
@media (min-width:861px){.stagger>*:nth-child(even){margin-top:48px}}

/* ---------- 7. 按钮 / 标签 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 22px;border:1px solid transparent;border-radius:var(--radius);
  font-family:var(--font-display);font-weight:700;font-size:15px;letter-spacing:.02em;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn::after{content:"→";font-family:var(--font-mono);font-size:14px;line-height:1;transition:transform var(--dur) var(--ease)}
.btn:hover::after{transform:translateX(3px)}
.btn--primary{background:var(--grass);color:#fff}
.btn--primary:hover{background:var(--grass-bright);color:var(--ink)}
.btn--lamp{background:var(--lamp);color:var(--ink)}
.btn--lamp:hover{background:var(--ink);color:var(--lamp)}
.btn--alert{background:var(--alert);color:#fff}
.btn--alert:hover{background:var(--ink);color:var(--alert)}
.btn--ghost{background:transparent;border-color:currentColor;color:inherit}
.btn--ghost:hover{background:currentColor}
.btn--ghost:hover *{color:var(--deep)}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  padding:3px 9px;border-radius:var(--radius);
  background:rgba(30,122,69,.14);color:var(--grass);
}
.tag::before{content:"";width:5px;height:5px;background:currentColor}
.tag--wine{background:rgba(122,31,53,.14);color:var(--wine)}
.tag--lamp{background:rgba(242,197,61,.2);color:#8a6a06}
.tag--slate{background:rgba(124,147,168,.18);color:#41586b}
.alert-flag{
  display:inline-flex;align-items:center;gap:7px;
  background:var(--alert);color:#fff;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  padding:4px 9px;border-radius:var(--radius);
}
.alert-flag::before{content:"";width:6px;height:6px;background:#fff;animation:pulse 1.8s steps(1,end) infinite}
@keyframes pulse{0%,60%{opacity:1}61%,100%{opacity:.25}}

/* ---------- 8. 面包屑 / 正文 / 面板 ---------- */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em;color:var(--slate);
  padding-block:18px;border-bottom:1px solid var(--line-soft)}
.breadcrumb__item{display:inline-flex;align-items:center;gap:10px}
.breadcrumb__item+.breadcrumb__item::before{content:"/";color:var(--line-strong)}
.breadcrumb a:hover{color:var(--grass-bright)}
.breadcrumb [aria-current="page"]{color:var(--ink)}
.section--deep .breadcrumb,.section--indigo .breadcrumb{color:rgba(234,243,236,.7);border-bottom-color:var(--line-soft)}
.section--deep .breadcrumb [aria-current="page"],.section--indigo .breadcrumb [aria-current="page"]{color:var(--paper)}
.prose{max-width:72ch;font-size:17px;line-height:1.85}
.prose>*+*{margin-top:1em}
.prose h2{margin-top:2em;padding-bottom:.3em;border-bottom:2px solid var(--grass)}
.prose h3{margin-top:1.6em}
.prose ul{display:grid;gap:.5em}
.prose ul li{position:relative;padding-left:1.5em}
.prose ul li::before{content:"—";position:absolute;left:0;color:var(--grass)}
.prose a{color:var(--grass);border-bottom:1px solid currentColor}
.prose blockquote{border-left:3px solid var(--lamp);padding-left:1.2em;color:#33463c}
.panel{background:rgba(255,255,255,.55);border-top:2px solid var(--grass);padding:clamp(18px,2.4vw,28px)}
.panel--indigo{background:var(--indigo);color:var(--paper);border-top-color:var(--lamp)}
.panel--wine{background:var(--wine);color:#fff;border-top-color:var(--lamp)}

/* ---------- 9. 图片容器（页面阶段放图） ---------- */
.media-frame{position:relative;display:block;overflow:hidden;border-radius:var(--radius);background:var(--indigo)}
.media-frame::before{content:"";display:block;padding-top:56.25%}
.media-frame>img,.media-frame>picture,.media-frame>svg,.media-frame>.media-frame__layer{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
}
.media-frame--square::before{padding-top:100%}
.media-frame--portrait::before{padding-top:133%}
.media-frame--wide::before{padding-top:42%}
.media-frame--light{background:linear-gradient(135deg,var(--deep) 0%,var(--indigo) 55%,var(--grass) 100%)}
.media-frame--light::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(var(--grid-light) 1px,transparent 1px),linear-gradient(90deg,var(--grid-light) 1px,transparent 1px);
  background-size:24px 24px;
}
.media-frame__caption{
  position:absolute;left:0;bottom:0;z-index:2;margin:0;
  background:rgba(11,42,31,.84);color:var(--paper);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;padding:6px 11px;
}

/* ---------- 10. 时间轴横幅 ---------- */
.timeline-banner{background:var(--deep);color:var(--paper);border-left:3px solid var(--lamp);padding:18px 0 0}
.timeline-banner__label{display:block;padding:0 20px 12px;color:var(--lamp)}
.timeline-banner__track{display:flex;overflow-x:auto;border-top:1px solid var(--line-soft)}
.timeline-banner__stop{flex:1 0 150px;position:relative;padding:16px 18px 18px;border-right:1px solid var(--line-soft)}
.timeline-banner__stop::before{content:"";position:absolute;left:18px;top:-4px;width:7px;height:7px;background:var(--lamp)}
.timeline-banner__time{display:block;font-family:var(--font-mono);font-size:13px;color:var(--grass-bright);letter-spacing:.06em}
.timeline-banner__team{display:block;font-weight:500;font-size:15px;margin-top:4px}

/* ---------- 11. 阶梯积分榜 ---------- */
.ladder{display:grid;gap:1px;background:var(--line-soft)}
.ladder__row{
  display:grid;grid-template-columns:52px minmax(110px,1.5fr) 1fr 70px;
  align-items:center;gap:14px;background:var(--paper);color:var(--ink);
  padding:9px 14px;position:relative;
}
.ladder__rank{font-family:var(--font-mono);font-size:14px;color:var(--slate)}
.ladder__team{font-weight:500;font-size:15px}
.ladder__bar{position:relative;height:8px;background:rgba(30,122,69,.16)}
.ladder__bar span{position:absolute;left:0;top:0;bottom:0;width:var(--fill,50%);background:var(--grass)}
.ladder__pts{font-family:var(--font-mono);font-size:18px;font-weight:600;text-align:right}
.ladder--dark .ladder__row{background:var(--indigo);color:var(--paper)}
.ladder--dark .ladder__rank{color:var(--slate)}
.ladder--dark .ladder__bar{background:rgba(234,243,236,.12)}
.ladder--dark .ladder__bar span{background:var(--grass-bright)}

/* =============================================================
   12. 刊头
   ============================================================= */
.skip-link{
  position:absolute;left:12px;top:-60px;z-index:120;
  background:var(--lamp);color:var(--ink);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;
  padding:10px 16px;border-radius:var(--radius);
  transition:top 180ms var(--ease);
}
.skip-link:focus{top:12px}

.site-header{
  position:sticky;top:0;z-index:60;isolation:isolate;
  background:var(--deep);color:var(--paper);
  border-bottom:1px solid rgba(52,196,107,.4);
}
.site-header__texture{
  position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(var(--grid-light) 1px,transparent 1px),linear-gradient(90deg,var(--grid-light) 1px,transparent 1px);
  background-size:24px 24px;
}
.header-inner{position:relative;z-index:2;width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}

.reading-progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:90;background:rgba(11,42,31,.4);pointer-events:none}
.reading-progress__bar{
  display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--grass),var(--grass-bright));
  transition:transform 120ms linear;
}

.utility-bar{
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  min-height:30px;padding-block:4px;
  border-bottom:1px solid var(--line-soft);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--slate);
  transition:opacity var(--dur) var(--ease);
}
.utility-bar__status{display:inline-flex;align-items:center;gap:10px;min-width:0}
.utility-bar__sep{color:rgba(124,147,168,.6)}
.utility-bar__links{display:inline-flex;align-items:center;gap:8px;flex-wrap:nowrap}
.utility-link{
  display:inline-flex;align-items:center;gap:7px;white-space:nowrap;
  padding:5px 10px;border:1px solid var(--line-soft);border-radius:var(--radius);
  color:var(--paper);letter-spacing:.06em;
  transition:background-color var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.utility-link::before{content:"";width:5px;height:5px;background:var(--grass-bright);transition:background-color var(--dur) var(--ease)}
.utility-link:hover,.utility-link:focus-visible{background:var(--grass);border-color:var(--grass-bright);color:#fff}
.utility-link:hover::before,.utility-link:focus-visible::before{background:var(--lamp)}

.masthead{display:flex;align-items:center;gap:clamp(12px,3vw,36px);min-height:64px;padding-block:8px}
.masthead__rule{flex:1 1 auto;height:1px;background:linear-gradient(90deg,transparent,var(--line-strong))}
.masthead__rule--end{background:linear-gradient(90deg,var(--line-strong),transparent)}
.brand{display:inline-flex;align-items:center;gap:14px;flex:0 0 auto}
.brand__mark{
  display:grid;place-items:center;flex:0 0 auto;
  width:40px;height:40px;background:var(--grass);color:#fff;border-radius:var(--radius);
  font-family:var(--font-display);font-weight:900;font-size:17px;letter-spacing:0;
}
.brand__text{display:flex;flex-direction:column;line-height:1.1}
.brand__wordmark{
  font-family:var(--font-display);font-weight:900;color:#fff;letter-spacing:.01em;
  font-size:clamp(18px,2.4vw,26px);
  transition:font-size var(--dur) var(--ease),color var(--dur) var(--ease);
}
.brand__tagline{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.18em;color:var(--grass-bright);
  transition:opacity var(--dur) var(--ease);
}
.brand:hover .brand__wordmark{color:var(--grass-bright)}
.site-header[data-scrolled="true"]{border-bottom-color:var(--grass-bright)}
.site-header[data-scrolled="true"] .utility-bar{opacity:.55}
.site-header[data-scrolled="true"] .brand__wordmark{font-size:20px}
.site-header[data-scrolled="true"] .brand__tagline{opacity:0}

.site-nav{position:relative;border-top:1px solid var(--line-soft)}
.nav-hint{display:none}
.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:10px 14px;border:1px solid var(--line-soft);border-radius:var(--radius);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--paper);
  transition:border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--grass-bright);background:rgba(30,122,69,.28)}
.nav-toggle__bars{display:grid;gap:4px;width:18px}
.nav-toggle__bar{display:block;height:2px;background:var(--grass-bright);transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease)}
.site-nav[data-open] .nav-toggle__bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-nav[data-open] .nav-toggle__bar:nth-child(2){opacity:0}
.site-nav[data-open] .nav-toggle__bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-list{display:grid;grid-template-columns:repeat(6,minmax(0,1fr))}
.nav-list__item{border-left:1px solid var(--line-soft)}
.nav-list__item:first-child{border-left:0}
.nav-link{
  position:relative;display:flex;align-items:center;justify-content:center;
  padding:14px 8px;color:rgba(234,243,236,.78);
  font-family:var(--font-display);font-weight:700;font-size:15px;letter-spacing:.04em;
  transition:color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.nav-link::after{
  content:"";position:absolute;bottom:0;left:50%;right:50%;height:3px;background:var(--grass-bright);
  transition:left var(--dur) var(--ease),right var(--dur) var(--ease);
}
.nav-link:hover{color:#fff;background:rgba(30,122,69,.34)}
.nav-link:hover::after,.nav-link[aria-current="page"]::after{left:0;right:0}
.nav-link[aria-current="page"]{color:#fff;background:rgba(30,122,69,.22)}

@media (max-width:1024px){
  .nav-link{font-size:14px;padding:13px 6px;letter-spacing:.02em}
}
@media (max-width:860px){
  .utility-bar{min-height:34px;overflow-x:auto;padding-block:5px}
  .utility-bar__status{flex:0 0 auto}
  .masthead{justify-content:center;min-height:56px;padding-block:6px}
  .masthead__rule{display:none}
  .site-nav{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-block:8px}
  .nav-hint{display:inline-flex;color:var(--slate);font-size:11.5px;letter-spacing:.08em}
  .nav-toggle{display:inline-flex}
  .nav-list{
    display:none;position:absolute;z-index:6;
    left:calc(var(--gutter) * -1);right:calc(var(--gutter) * -1);top:100%;
    grid-template-columns:1fr;
    padding:6px var(--gutter) 14px;
    background:var(--indigo);
    border-top:1px solid var(--line-soft);
    border-bottom:1px solid rgba(52,196,107,.4);
  }
  .site-nav[data-open] .nav-list{display:grid}
  .nav-list__item{border-left:0;border-bottom:1px solid var(--line-soft)}
  .nav-list__item:last-child{border-bottom:0}
  .nav-link{justify-content:flex-start;padding:13px 4px;font-size:16px}
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{color:var(--grass-bright);background:transparent}
  .brand__tagline{letter-spacing:.12em}
}
@media (max-width:560px){
  .utility-bar__links{gap:6px}
  .utility-link{padding:5px 8px;font-size:11.5px}
}

/* =============================================================
   13. 页脚
   ============================================================= */
.site-footer{
  position:relative;isolation:isolate;
  background:var(--indigo);color:var(--paper);
  border-top:3px solid var(--grass);
  font-size:15px;
}
.site-footer__texture{
  position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(var(--grid-light) 1px,transparent 1px),linear-gradient(90deg,var(--grid-light) 1px,transparent 1px);
  background-size:24px 24px;
}
.footer-inner{
  position:relative;z-index:1;
  width:100%;max-width:var(--maxw);margin-inline:auto;
  padding:clamp(40px,5.5vw,72px) var(--gutter) 0;
  display:grid;grid-template-columns:minmax(240px,1fr) 2fr;gap:clamp(28px,4vw,56px);
}
.footer-identity{display:grid;gap:12px;align-content:start}
.footer-brand{display:inline-flex;align-items:center;gap:12px}
.footer-brand__mark{
  display:grid;place-items:center;width:36px;height:36px;flex:0 0 auto;
  background:var(--grass);color:#fff;border-radius:var(--radius);
  font-family:var(--font-display);font-weight:900;font-size:15px;
}
.footer-brand__name{font-family:var(--font-display);font-weight:900;font-size:20px;letter-spacing:.01em;color:#fff}
.footer-brand:hover .footer-brand__name{color:var(--grass-bright)}
.footer-brand__tagline{font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--grass-bright)}
.footer-identity__line{max-width:34ch;color:rgba(234,243,236,.76);font-size:14.5px;line-height:1.8}
.footer-identity__domain{color:var(--slate);font-size:12.5px;letter-spacing:.06em}

.footer-columns{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(20px,3vw,36px);align-content:start}
.footer-col__title{
  font-family:var(--font-display);font-weight:900;font-size:15px;letter-spacing:.06em;
  color:var(--paper);padding-bottom:10px;margin-bottom:12px;border-bottom:1px solid var(--line-soft);
}
.footer-col__list{display:grid;gap:9px}
.footer-link{
  position:relative;display:inline-flex;align-items:center;gap:8px;
  color:rgba(234,243,236,.78);font-size:14.5px;
  transition:color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.footer-link::before{content:"";width:0;height:1px;background:var(--grass-bright);transition:width var(--dur) var(--ease)}
.footer-link:hover,.footer-link:focus-visible{color:var(--grass-bright)}
.footer-link:hover::before,.footer-link:focus-visible::before{width:14px}

.footer-lower{
  position:relative;z-index:1;
  width:100%;max-width:var(--maxw);margin-inline:auto;
  padding:clamp(28px,4vw,44px) var(--gutter) clamp(24px,3vw,36px);
  display:grid;gap:clamp(20px,3vw,32px);
}
.footer-notes{border-top:1px solid var(--line-soft);padding-top:20px}
.footer-details{border:1px solid var(--line-soft);border-radius:var(--radius);background:rgba(11,42,31,.28)}
.footer-details__summary{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:14px 18px;color:var(--paper);
  transition:background-color var(--dur) var(--ease);
}
.footer-details__summary::after{
  content:"+";font-family:var(--font-mono);font-size:16px;color:var(--grass-bright);
  transition:transform var(--dur) var(--ease);
}
.footer-details[open] .footer-details__summary::after{transform:rotate(45deg)}
.footer-details__summary:hover{background:rgba(30,122,69,.3)}
.footer-details__summary .index-label{color:var(--paper)}
.footer-details__count{color:var(--slate);font-size:12px;letter-spacing:.08em}
.footer-details__list{display:grid;gap:10px;padding:0 18px 20px}
.footer-details__list li{position:relative;padding-left:20px;color:rgba(234,243,236,.78);font-size:14.5px;line-height:1.8}
.footer-details__list li::before{content:"—";position:absolute;left:0;color:var(--grass-bright)}

.footer-meta{
  display:grid;grid-template-columns:2fr 1fr;gap:clamp(20px,3vw,40px);
  border-top:1px solid var(--line-soft);padding-top:20px;
}
.footer-contact{display:grid;gap:8px}
.footer-contact__item{display:flex;flex-wrap:wrap;align-items:baseline;gap:10px;font-size:14.5px}
.footer-contact__key{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--slate);min-width:68px}
.footer-contact__value{color:var(--paper)}
.footer-contact__note{color:rgba(234,243,236,.62);font-size:13.5px;max-width:52ch}
.footer-address__value{color:rgba(234,243,236,.82);font-size:14.5px;margin-top:6px;max-width:30ch}

.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;
  border-top:1px solid var(--line-soft);padding-top:18px;
  font-size:13.5px;color:var(--slate);
}
.footer-copy{color:rgba(234,243,236,.72)}
.footer-icp{color:var(--slate);letter-spacing:.06em}
.footer-legal{display:flex;flex-wrap:wrap;gap:18px}
.footer-legal .footer-link{font-size:13.5px}

@media (max-width:860px){
  .footer-inner{grid-template-columns:1fr;padding-top:clamp(32px,8vw,48px)}
  .footer-columns{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-meta{grid-template-columns:1fr}
}
@media (max-width:520px){
  .footer-columns{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:12px}
}

/* ---------- 14. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  html{scroll-behavior:auto}
  [data-reveal]{opacity:1 !important;transform:none !important}
  .reading-progress__bar{transition:none}
  .alert-flag::before{animation:none;opacity:1}
}