/* ============================================================
   火狐体育主站 · 共享样式 /assets/site.css
   炭黑底 · 橙色信号线 · 切角纸张叠层
   ============================================================ */

:root{
  --signal-orange:#FF6B1A;
  --ember-deep:#D14A00;
  --carbon-black:#14161A;
  --pitch-900:#1E222A;
  --pitch-800:#262B34;
  --cool-gray-400:#8C939F;
  --cool-gray-200:#D7DBE2;
  --lake-teal:#1FA9A0;
  --dusk-purple:#5B4B8A;
  --paper-white:#F7F5F1;
  --ink-800:#22252B;

  --font-sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Courier New",monospace;

  --w-max:1180px;
  --w-text:720px;
  --cut:16px;
  --gap:clamp(16px,2.4vw,28px);
  --pad-y:clamp(48px,7vw,88px);
  --dur:180ms;
  --ease:cubic-bezier(.2,.7,.3,1);

  --hairline:rgba(140,147,159,.22);
  --hairline-strong:rgba(140,147,159,.42);
  --orange-line:rgba(255,107,26,.55);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:110px}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,dl,dd,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%;height:auto}
table{border-collapse:collapse;width:100%}
main{display:block}

/* ---------- 基础排版 ---------- */
body{
  background-color:var(--carbon-black);
  background-image:
    linear-gradient(rgba(140,147,159,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(140,147,159,.06) 1px,transparent 1px);
  background-size:64px 64px;
  color:var(--paper-white);
  font-family:var(--font-sans);
  font-size:16.5px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-weight:900;letter-spacing:-.02em;line-height:1.14;color:inherit}
h1{font-size:clamp(2.1rem,4.8vw,3.5rem);line-height:1.08}
h2{font-size:clamp(1.6rem,3.2vw,2.25rem)}
h3{font-size:clamp(1.15rem,2vw,1.375rem);line-height:1.3}
strong{font-weight:900}
::selection{background:var(--signal-orange);color:var(--carbon-black)}

:where(a,button,summary,[tabindex]):focus-visible{
  outline:2px solid var(--signal-orange);
  outline-offset:2px;
}

.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

.skip-link{
  position:absolute;left:16px;top:-80px;z-index:200;
  background:var(--signal-orange);color:var(--carbon-black);
  padding:10px 18px;font-weight:900;font-size:14px;letter-spacing:.06em;
  border-radius:2px;transition:top var(--dur) var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{top:12px}

/* ============================================================
   头部 · 杂志刊头
   ============================================================ */
.site-header{
  position:sticky;top:0;z-index:80;
  background:var(--carbon-black);
  background-image:linear-gradient(180deg,rgba(30,34,42,.97),rgba(20,22,26,.99));
  border-bottom:1px solid var(--orange-line);
  transition:box-shadow var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.site-header[data-scrolled]{
  box-shadow:0 12px 26px -20px #000;
  border-bottom-color:var(--signal-orange);
}
.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  pointer-events:none;overflow:hidden;
}
.scroll-progress__bar{
  display:block;height:100%;width:0;
  background:var(--signal-orange);
  transform-origin:left center;
  transition:width 80ms linear;
}
.masthead{position:relative}
.masthead__inner{
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;
  gap:14px;width:100%;max-width:var(--w-max);margin-inline:auto;
  padding:14px clamp(16px,4vw,40px) 10px;
  transition:padding var(--dur) var(--ease);
}
.site-header[data-scrolled] .masthead__inner{padding-block:7px 5px}

.masthead__note{
  justify-self:start;
  font-family:var(--font-mono);font-size:10.5px;line-height:1.5;
  letter-spacing:.16em;color:var(--cool-gray-400);
}
.masthead__note-cn{display:block;letter-spacing:.12em}
.masthead__note-en{display:block;color:rgba(140,147,159,.62);letter-spacing:.2em}

.brand{display:inline-flex;align-items:center;gap:10px;justify-self:center}
.brand__mark{
  display:grid;place-items:center;width:36px;height:36px;
  background:var(--signal-orange);color:var(--carbon-black);
  font-size:18px;font-weight:900;line-height:1;letter-spacing:0;
  clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%);
  transition:transform var(--dur) var(--ease),background var(--dur) var(--ease);
}
.brand:hover .brand__mark{transform:translateY(-2px);background:var(--ember-deep)}
.brand__text{display:block;text-align:left}
.brand__name{
  display:block;font-size:clamp(19px,2.6vw,25px);font-weight:900;
  letter-spacing:.07em;line-height:1;color:var(--paper-white);
  transition:color var(--dur) var(--ease);
}
.brand:hover .brand__name{color:var(--signal-orange)}
.brand__sub{
  display:block;margin-top:5px;
  font-family:var(--font-mono);font-size:9.5px;letter-spacing:.3em;
  color:var(--cool-gray-400);
}

.version-tag{
  justify-self:end;text-align:right;
  font-family:var(--font-mono);font-size:10.5px;line-height:1.5;
  letter-spacing:.14em;color:var(--cool-gray-400);
  border-right:2px solid var(--signal-orange);
  padding-right:9px;
}
.version-tag__en{display:block;color:var(--paper-white)}
.version-tag__cn{display:block}

.nav-toggle{
  display:none;justify-self:end;align-items:center;gap:8px;
  padding:7px 12px;border:1px solid var(--hairline-strong);border-radius:999px;
  color:var(--paper-white);font-size:12px;font-weight:700;letter-spacing:.1em;
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--signal-orange)}
.nav-toggle__bars{display:grid;gap:3px;width:16px}
.nav-toggle__bars span{display:block;height:2px;background:var(--signal-orange);border-radius:2px;transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease)}
.site-header[data-open] .nav-toggle{border-color:var(--signal-orange);background:rgba(255,107,26,.14)}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
.nav-toggle__label{white-space:nowrap}

.primary-nav{
  display:flex;justify-content:center;
  width:100%;max-width:var(--w-max);margin-inline:auto;
  padding:0 clamp(16px,4vw,40px) 13px;
  transition:padding var(--dur) var(--ease);
}
.site-header[data-scrolled] .primary-nav{padding-bottom:8px}
.primary-nav__list{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:center;
  gap:clamp(10px,2vw,26px);padding-top:6px;
}
.primary-nav__link{
  position:relative;display:inline-block;padding:8px 4px;
  font-size:15px;font-weight:700;letter-spacing:.04em;
  color:var(--cool-gray-200);
  transition:color var(--dur) var(--ease);
}
.primary-nav__link::after{
  content:"";position:absolute;left:0;bottom:2px;height:2px;width:100%;
  background:var(--signal-orange);
  transform:scaleX(0);transform-origin:left center;
  transition:transform var(--dur) var(--ease);
}
.primary-nav__link:hover{color:var(--paper-white)}
.primary-nav__link:hover::after,
.primary-nav__link:focus-visible::after{transform:scaleX(1)}
.primary-nav__link[aria-current="page"]{color:var(--signal-orange)}
.primary-nav__link[aria-current="page"]::after{transform:scaleX(1)}

/* 第三栏悬浮胶囊 */
.primary-nav__item--capsule{margin-top:-9px}
.primary-nav__link--capsule{
  padding:6px 17px;
  border:2px solid var(--signal-orange);border-radius:999px;
  background:rgba(255,107,26,.11);
  color:var(--signal-orange);
  font-weight:900;letter-spacing:.06em;
  box-shadow:0 0 0 4px rgba(255,107,26,.07);
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.primary-nav__link--capsule::after{display:none}
.primary-nav__link--capsule:hover,
.primary-nav__link--capsule:focus-visible{
  background:var(--signal-orange);color:var(--carbon-black);
  transform:translateY(-2px);
  box-shadow:0 0 0 4px rgba(255,107,26,.14),0 10px 18px -14px var(--signal-orange);
}
.primary-nav__link--capsule[aria-current="page"]{
  background:var(--signal-orange);color:var(--carbon-black);
}

@media (max-width:899px){
  .masthead__inner{grid-template-columns:1fr auto;padding:11px 16px 9px}
  .masthead__note,.version-tag{display:none}
  .brand{justify-self:start}
  .brand__sub{display:none}
  .nav-toggle{display:inline-flex}
  .primary-nav{display:none;padding:0 16px 16px;justify-content:stretch}
  .site-header[data-open] .primary-nav{
    display:block;
    animation:nav-drop 200ms var(--ease) both;
  }
  .primary-nav__list{flex-direction:column;align-items:stretch;gap:0;padding-top:0}
  .primary-nav__item{border-top:1px solid rgba(140,147,159,.16)}
  .primary-nav__item--capsule{margin-top:12px;border-top:0}
  .primary-nav__link{
    display:flex;align-items:center;justify-content:space-between;
    padding:13px 6px;font-size:16px;
  }
  .primary-nav__link::after{bottom:8px;width:32px}
  .primary-nav__link--capsule{justify-content:center;padding:11px 16px;border-radius:6px}
}
@keyframes nav-drop{
  from{opacity:0;transform:translateY(-6px)}
  to{opacity:1;transform:none}
}

/* ============================================================
   页脚 · 三带结构
   ============================================================ */
.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  background:var(--carbon-black);
  border-top:2px solid var(--signal-orange);
  color:var(--cool-gray-200);
}
.footer-main{
  display:grid;gap:var(--gap);
  width:100%;max-width:var(--w-max);margin-inline:auto;
  padding:clamp(30px,5vw,54px) clamp(16px,4vw,40px) clamp(22px,3.4vw,36px);
}
@media (min-width:820px){
  .footer-main{grid-template-columns:minmax(210px,1fr) 2.3fr;gap:clamp(24px,4vw,56px)}
}
.footer-brand{display:grid;gap:10px;align-content:start}
.footer-brand__word{
  font-size:clamp(20px,2.6vw,24px);font-weight:900;letter-spacing:.08em;
  color:var(--paper-white);line-height:1;transition:color var(--dur) var(--ease);
}
.footer-brand__word:hover{color:var(--signal-orange)}
.footer-brand__meta{
  font-size:12.5px;line-height:1.7;letter-spacing:.02em;
  color:var(--cool-gray-400);max-width:26ch;
}
.footer-brand__version{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.16em;
  color:var(--signal-orange);
}
.footer-nav{
  display:grid;gap:var(--gap);
  grid-template-columns:repeat(2,minmax(0,1fr));
}
@media (min-width:720px){.footer-nav{grid-template-columns:repeat(4,minmax(0,1fr))}}
.footer-col__title{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:7px;
  padding-bottom:8px;margin-bottom:11px;
  border-bottom:1px solid var(--hairline);
  font-size:12px;letter-spacing:.14em;
}
.footer-col__en{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.2em;
  color:var(--signal-orange);
}
.footer-col__cn{font-weight:700;letter-spacing:.14em;color:var(--cool-gray-400)}
.footer-col__list{display:grid;gap:7px}
.footer-col__list a{
  display:inline-block;font-size:14.5px;color:var(--cool-gray-200);
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-col__list a:hover,
.footer-col__list a:focus-visible{color:var(--paper-white);border-bottom-color:var(--signal-orange)}

.footer-contact{
  background:var(--pitch-900);
  border-top:1px solid var(--hairline);
}
.footer-contact__inner{
  width:100%;max-width:var(--w-max);margin-inline:auto;
  padding:clamp(20px,3.2vw,30px) clamp(16px,4vw,40px);
}
.footer-contact__list{display:grid;gap:16px}
@media (min-width:780px){
  .footer-contact__list{grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,3vw,34px)}
}
.footer-contact__item{display:grid;gap:3px;min-width:0}
.footer-contact__label{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.18em;
  color:var(--cool-gray-400);
}
.footer-contact__value{
  font-size:15px;color:var(--paper-white);line-height:1.5;word-break:break-word;
}
.footer-contact__value--mono{font-family:var(--font-mono);letter-spacing:.02em}
.footer-contact__note{
  grid-column:1/-1;
  margin-top:4px;padding-left:11px;
  border-left:2px solid var(--lake-teal);
  font-size:12.5px;line-height:1.7;color:var(--cool-gray-400);
}

.footer-legal{border-top:1px solid var(--hairline)}
.footer-legal__inner{
  display:grid;gap:8px;
  width:100%;max-width:var(--w-max);margin-inline:auto;
  padding:16px clamp(16px,4vw,40px) clamp(22px,3.4vw,30px);
  font-size:12.5px;line-height:1.7;color:var(--cool-gray-400);
}
@media (min-width:860px){
  .footer-legal__inner{grid-template-columns:1fr auto;align-items:center;gap:18px}
}
.footer-legal__note{margin:0}
.footer-legal__copy{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;
  color:var(--cool-gray-400);
}
.footer-legal__icp{color:var(--cool-gray-200);white-space:nowrap}

/* ============================================================
   通用布局
   ============================================================ */
.container{
  width:100%;max-width:var(--w-max);margin-inline:auto;
  padding-inline:clamp(16px,4vw,40px);
}
.prose{max-width:var(--w-text)}
.prose p{color:rgba(247,245,241,.86)}
.prose p+p{margin-top:1em}
.prose a{color:var(--signal-orange);border-bottom:1px solid var(--orange-line)}
.prose a:hover{color:var(--ember-deep)}

.section{padding-block:var(--pad-y)}
.section--tight{padding-block:clamp(28px,4.4vw,52px)}
.section__head{display:grid;gap:10px;margin-bottom:clamp(20px,3vw,34px)}

.grid{display:grid;gap:var(--gap)}
.grid--2{grid-template-columns:minmax(0,1fr)}
.grid--3{grid-template-columns:minmax(0,1fr)}
@media (min-width:720px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:960px){
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
}
.grid--split{grid-template-columns:minmax(0,1fr)}
@media (min-width:900px){
  .grid--split{grid-template-columns:7fr 5fr;gap:clamp(24px,4vw,52px);align-items:start}
}
.grid--aside{grid-template-columns:minmax(0,1fr)}
@media (min-width:980px){
  .grid--aside{grid-template-columns:200px minmax(0,1fr);gap:clamp(24px,4vw,48px)}
}

/* 面包屑 */
.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding-block:14px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:var(--cool-gray-400);
}
.breadcrumbs a{color:var(--cool-gray-200);transition:color var(--dur) var(--ease)}
.breadcrumbs a:hover{color:var(--signal-orange)}
.breadcrumbs__sep{color:rgba(140,147,159,.5)}
.breadcrumbs [aria-current="page"]{color:var(--signal-orange)}

/* ============================================================
   标签 / 按钮
   ============================================================ */
.tag{
  display:inline-flex;flex-wrap:wrap;align-items:baseline;gap:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--cool-gray-400);
}
.tag::before{
  content:"";display:inline-block;width:18px;height:2px;
  background:currentColor;align-self:center;
}
.tag__en{font-family:var(--font-mono);letter-spacing:.14em}
.tag__cn{font-family:var(--font-sans);font-weight:700;letter-spacing:.1em}
.tag--orange{color:var(--signal-orange)}
.tag--teal{color:var(--lake-teal)}

.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 22px;border-radius:2px;
  font-size:15px;font-weight:900;letter-spacing:.05em;line-height:1.2;
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background var(--dur) var(--ease),color var(--dur) var(--ease);
}
.btn--primary{
  background:var(--signal-orange);color:var(--carbon-black);
  box-shadow:3px 3px 0 var(--ember-deep);
}
.btn--primary:hover{background:#FF7D38;transform:translate(-1px,-1px);box-shadow:5px 5px 0 var(--ember-deep)}
.btn--ghost{
  color:var(--signal-orange);background:transparent;
  box-shadow:inset 0 0 0 2px var(--signal-orange);
}
.btn--ghost:hover{background:rgba(255,107,26,.14);transform:translate(-1px,-1px)}
.btn__arrow{font-family:var(--font-mono);font-size:13px;letter-spacing:0}

/* ============================================================
   章节长卷
   ============================================================ */
.chapter{position:relative;padding-block:clamp(34px,5vw,64px)}
.chapter__head{position:relative;display:grid;gap:12px;margin-bottom:clamp(18px,2.6vw,30px)}
.chapter__num{
  display:block;
  font-family:var(--font-mono);font-weight:600;
  font-size:clamp(44px,8vw,86px);line-height:.86;letter-spacing:-.04em;
  color:rgba(255,107,26,.16);
  -webkit-text-stroke:1.5px var(--signal-orange);
  text-stroke:1.5px var(--signal-orange);
}
@media (min-width:900px){
  .chapter__num{margin-left:-.06em}
}
.chapter__title{
  font-size:clamp(25px,3.6vw,36px);font-weight:900;
  letter-spacing:-.02em;line-height:1.14;
}
.chapter__lede{max-width:var(--w-text);color:rgba(247,245,241,.78)}

/* 整宽色带 */
.band{position:relative;padding-block:clamp(30px,4.6vw,56px)}
.band--paper{background:var(--paper-white);color:var(--ink-800)}
.band--pitch{background:var(--pitch-900)}
.band--teal{background:var(--lake-teal);color:var(--carbon-black)}
.band--purple{background:var(--dusk-purple);color:var(--paper-white)}
.band--orange{background:var(--signal-orange);color:var(--carbon-black)}
.band--paper .prose p{color:rgba(34,37,43,.86)}
.band--paper .prose a{color:var(--ember-deep);border-bottom-color:rgba(209,74,0,.4)}
.band--teal .tag,.band--orange .tag{color:rgba(20,22,26,.72)}
.band--paper .tag{color:rgba(34,37,43,.6)}
.band--paper .chapter__num{color:rgba(255,107,26,.18);-webkit-text-stroke-color:var(--ember-deep)}

/* ============================================================
   卡片 / 叠层
   ============================================================ */
.card{
  position:relative;
  padding:22px 24px;
  background:var(--pitch-900);color:var(--paper-white);
  clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));
  box-shadow:inset 0 0 0 1px rgba(140,147,159,.24);
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.card:hover{
  transform:translateY(-3px);
  box-shadow:inset 0 0 0 1px rgba(255,107,26,.55);
}
.card--paper{background:var(--paper-white);color:var(--ink-800);box-shadow:inset 0 0 0 1px rgba(34,37,43,.14)}
.card--teal{background:var(--lake-teal);color:var(--carbon-black);box-shadow:inset 0 0 0 1px rgba(20,22,26,.2)}
.card--purple{background:var(--dusk-purple);color:var(--paper-white);box-shadow:inset 0 0 0 1px rgba(247,245,241,.24)}
.card__title{font-size:20px;font-weight:900;line-height:1.28;letter-spacing:-.01em;margin-bottom:8px}
.card__meta{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:var(--cool-gray-400);
}
.card--paper .card__meta{color:rgba(34,37,43,.55)}
.card--teal .card__meta{color:rgba(20,22,26,.65)}

/* 纸张错位叠层 */
.stack{position:relative;isolation:isolate}
.stack::before,.stack::after{
  content:"";position:absolute;inset:0;z-index:-1;
  background:var(--pitch-900);
  box-shadow:inset 0 0 0 1px rgba(140,147,159,.18);
}
.stack::before{transform:translate(-7px,8px) rotate(-.5deg)}
.stack::after{transform:translate(8px,-7px) rotate(.6deg);background:rgba(255,107,26,.16)}

/* ============================================================
   专题研究板
   ============================================================ */
.study{
  display:grid;gap:1px;
  background:var(--hairline);
  border:1px solid var(--hairline);
}
.study__cell{
  background:var(--pitch-900);
  padding:18px 20px;
  display:grid;gap:8px;align-content:start;
}
.study__label{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--signal-orange);
}
.study__body{font-size:14.5px;line-height:1.7;color:rgba(247,245,241,.84)}
.study__cell--teal{background:var(--lake-teal);color:var(--carbon-black)}
.study__cell--teal .study__label{color:rgba(20,22,26,.7)}
.study__cell--teal .study__body{color:rgba(20,22,26,.88)}
.study__cell--purple{background:var(--dusk-purple);color:var(--paper-white)}
.study__cell--purple .study__label{color:rgba(247,245,241,.74)}
.study__cell--purple .study__body{color:rgba(247,245,241,.9)}
@media (min-width:860px){
  .study{grid-template-columns:repeat(4,minmax(0,1fr))}
}

/* ============================================================
   图片容器基础规则
   ============================================================ */
.figure{display:grid;gap:10px;position:relative}
.figure__frame{
  position:relative;overflow:hidden;
  background-color:var(--pitch-800);
  background-image:
    linear-gradient(135deg,rgba(255,107,26,.16),transparent 62%),
    repeating-linear-gradient(45deg,rgba(140,147,159,.1) 0 1px,transparent 1px 12px);
  box-shadow:inset 0 0 0 1px rgba(140,147,159,.28);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 22px),calc(100% - 22px) 100%,0 100%);
}
.figure__frame::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--signal-orange);
}
.figure__img,
.figure__frame img{
  display:block;width:100%;height:100%;
  aspect-ratio:16/10;
  object-fit:cover;
  transition:transform 260ms var(--ease);
}
.figure__frame:hover .figure__img,
.figure__frame:hover img{transform:scale(1.02)}
.figure__img--wide{aspect-ratio:21/9}
.figure__img--tall{aspect-ratio:3/4}
.figure__caption{
  padding-left:11px;border-left:2px solid var(--lake-teal);
  font-size:12.5px;line-height:1.6;color:var(--cool-gray-400);
}

/* ============================================================
   数据 / 折叠 / 表格
   ============================================================ */
.stat{display:grid;gap:3px}
.stat__value{
  font-family:var(--font-mono);font-weight:600;
  font-size:clamp(27px,4vw,40px);line-height:1;letter-spacing:-.02em;
  color:var(--signal-orange);
}
.stat__label{font-size:12px;letter-spacing:.06em;color:var(--cool-gray-400)}

.fold{border-top:1px solid var(--hairline)}
.fold:last-of-type{border-bottom:1px solid var(--hairline)}
.fold__summary{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:14px 2px;cursor:pointer;
  font-weight:700;font-size:16px;list-style:none;
  transition:color var(--dur) var(--ease);
}
.fold__summary::-webkit-details-marker{display:none}
.fold__summary:hover{color:var(--signal-orange)}
.fold__summary::after{
  content:"＋";font-family:var(--font-mono);font-weight:600;
  color:var(--signal-orange);flex:none;
}
.fold[open] .fold__summary::after{content:"－"}
.fold__body{padding:2px 0 18px;font-size:15px;line-height:1.75;color:rgba(247,245,241,.82)}

.table-wrap{
  overflow-x:auto;
  border:1px solid var(--hairline);
  background:var(--pitch-900);
}
.data-table{width:100%;min-width:560px;font-size:14.5px}
.data-table th,.data-table td{
  padding:12px 14px;text-align:left;
  border-bottom:1px solid var(--hairline);
  vertical-align:top;
}
.data-table thead th{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--cool-gray-400);
  background:rgba(140,147,159,.07);
  font-weight:600;
}
.data-table tbody th{font-weight:700;color:var(--paper-white)}
.data-table td{
  font-family:var(--font-mono);letter-spacing:.02em;
  color:rgba(247,245,241,.82);
}

/* ============================================================
   粘性目录 / 回顶
   ============================================================ */
.toc{
  position:sticky;top:120px;
  display:grid;gap:3px;padding-block:10px;
  border-left:2px solid var(--hairline);
}
.toc__title{
  padding-left:13px;margin-bottom:6px;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--cool-gray-400);
}
.toc__link{
  display:block;margin-left:-2px;padding:6px 13px;
  border-left:2px solid transparent;
  font-size:13.5px;line-height:1.5;color:var(--cool-gray-400);
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.toc__link:hover{color:var(--paper-white)}
.toc__link[aria-current="true"]{
  color:var(--signal-orange);
  border-left-color:var(--signal-orange);
  background:rgba(255,107,26,.09);
}
@media (max-width:979px){
  .toc{position:static;top:auto;border-left:0;border-top:1px solid var(--hairline);padding-top:14px}
  .toc__link{margin-left:0;border-left:0;padding-inline:4px}
  .toc__link[aria-current="true"]{border-left:0;background:transparent;color:var(--signal-orange)}
}

.to-top{
  position:fixed;right:clamp(14px,3vw,28px);bottom:clamp(14px,3vw,28px);z-index:70;
  display:grid;place-items:center;width:46px;height:46px;
  background:var(--signal-orange);color:var(--carbon-black);
  font-family:var(--font-mono);font-weight:600;font-size:16px;
  clip-path:polygon(0 0,100% 0,100% 68%,68% 100%,0 100%);
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),visibility var(--dur),background var(--dur) var(--ease);
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--paper-white)}

/* ============================================================
   显现
   ============================================================ */
.has-js [data-reveal]:not(.is-visible){opacity:.5;transform:translateY(12px)}
[data-reveal]{
  transition:opacity 220ms var(--ease),transform 220ms var(--ease);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* ============================================================
   动效降级
   ============================================================ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  .has-js [data-reveal]:not(.is-visible){opacity:1;transform:none}
  .figure__frame:hover .figure__img,
  .figure__frame:hover img,
  .card:hover,
  .btn--primary:hover,
  .btn--ghost:hover{transform:none}
}