/* ==========================================================================
   华体会 · 季票信息  |  /assets/site.css
   竞技数据档案室 —— 共享外壳与基础组件
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root{
  --c-abyss:#0A1F1A;
  --c-coal:#141719;
  --c-shale:#3A4441;
  --c-moss:#244A3D;
  --c-cyan:#4FE0C8;
  --c-amber:#E6B450;
  --c-rust:#8C3B3B;
  --c-paper:#F2EFE6;
  --c-mist:#98A6A0;
  --c-clay:#A66A4A;

  --bg:var(--c-abyss);
  --surface:var(--c-coal);
  --text:var(--c-paper);
  --text-soft:#CBD3CE;
  --text-dim:var(--c-mist);
  --line:rgba(58,68,65,.9);
  --line-soft:rgba(152,166,160,.18);
  --accent:var(--c-cyan);
  --accent-2:var(--c-amber);

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

  --fs-h1:clamp(2.125rem,5.2vw,3.5rem);
  --fs-h2:clamp(1.5rem,3.2vw,2.25rem);
  --fs-h3:clamp(1.125rem,1.8vw,1.5rem);
  --fs-body:1rem;
  --fs-caption:.8125rem;
  --fs-data:1.125rem;

  --rail:280px;
  --header-h:76px;
  --gutter:clamp(1.25rem,4vw,3.5rem);
  --maxw:1320px;
  --radius-s:3px;
  --radius-m:10px;
  --radius-organic:22px 6px 22px 6px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow:0 24px 60px -32px rgba(0,0,0,.95);
}

/* ---------- 2. 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,fieldset{margin:0;padding:0;}
ul,ol{list-style:none;}
img,svg,video{display:block;max-width:100%;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
a{color:inherit;text-decoration:none;}
table{border-collapse:collapse;width:100%;}
:focus-visible{outline:2px solid var(--c-cyan);outline-offset:3px;border-radius:2px;}

/* ---------- 3. 基础排版 ---------- */
body{
  min-height:100vh;
  display:flex;
  flex-direction:column;
  font-family:var(--font-sans);
  font-size:var(--fs-body);
  line-height:1.75;
  font-weight:400;
  color:var(--text-soft);
  background:
    radial-gradient(1200px 620px at 10% -12%,rgba(36,74,61,.55),transparent 62%),
    radial-gradient(900px 520px at 102% -4%,rgba(79,224,200,.07),transparent 58%),
    var(--c-abyss);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
#main-content{display:block;flex:1 0 auto;scroll-margin-top:calc(var(--header-h) + 8px);}
[id]{scroll-margin-top:calc(var(--header-h) + 16px);}

h1,.h1{font-size:var(--fs-h1);font-weight:900;line-height:1.1;letter-spacing:.045em;color:var(--c-paper);}
h2,.h2{font-size:var(--fs-h2);font-weight:800;line-height:1.2;letter-spacing:.04em;color:var(--c-paper);}
h3,.h3{font-size:var(--fs-h3);font-weight:700;line-height:1.35;letter-spacing:.03em;color:var(--c-paper);}
h4{font-size:1rem;font-weight:700;color:var(--c-paper);letter-spacing:.03em;}
p{margin-bottom:1.15rem;}
p:last-child{margin-bottom:0;}
strong{color:var(--c-paper);font-weight:700;}
.mono,.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.06em;}

.eyebrow{display:inline-flex;align-items:center;gap:.6rem;font-family:var(--font-mono);font-size:.6875rem;font-weight:500;letter-spacing:.22em;text-transform:uppercase;color:var(--c-cyan);}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor;opacity:.75;}

/* ---------- 4. 显现（置于组件之前，便于卡片 hover 覆盖） ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .55s var(--ease),transform .55s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}
[data-reveal].is-visible{opacity:1;transform:translateY(0);}

/* ---------- 5. 布局工具 ---------- */
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter);}
.container--narrow{max-width:900px;}
.section{position:relative;padding-block:clamp(3.5rem,7vw,6rem);}
.section--tight{padding-block:clamp(2rem,4vw,3rem);}
.section--panel{background:linear-gradient(180deg,rgba(20,23,25,.9),rgba(10,31,26,.55));border-block:1px solid var(--line);}
.page-top{padding-top:calc(var(--header-h) + clamp(2.5rem,6vw,4.5rem));}
.rule{border:0;height:1px;background:var(--line-soft);margin-block:clamp(1.75rem,4vw,2.75rem);}
.grid{display:grid;gap:clamp(1rem,2.4vw,1.75rem);}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(260px,1fr));}
@media (min-width:768px){
  .stagger>*:nth-child(even){margin-top:2.25rem;}
}
.rail{display:grid;grid-template-columns:var(--rail) minmax(0,1fr);gap:clamp(1.5rem,4vw,3.5rem);align-items:start;}
.rail__aside{position:sticky;top:calc(var(--header-h) + 1.5rem);}
@media (max-width:1023px){
  .rail{grid-template-columns:1fr;}
  .rail__aside{position:static;top:auto;}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (max-width:640px){
  .grid--2,.grid--3{grid-template-columns:1fr;}
  :root{--header-h:64px;}
}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.45rem;
  padding:.62rem 1.05rem;border:1px solid transparent;border-radius:var(--radius-s);
  font-size:.875rem;font-weight:700;letter-spacing:.04em;line-height:1.2;white-space:nowrap;
  transition:background-color .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease),box-shadow .25s var(--ease),transform .25s var(--ease);
}
.btn:active{transform:translateY(1px);}
.btn--ghost{border-color:rgba(152,166,160,.42);color:var(--c-paper);background:rgba(10,31,26,.4);}
.btn--ghost:hover{color:var(--c-cyan);border-color:var(--c-cyan);background:rgba(36,74,61,.5);}
.btn--amber{background:var(--c-amber);color:#171307;border-color:var(--c-amber);}
.btn--amber:hover{background:#f2c86e;border-color:#f2c86e;box-shadow:0 0 26px -8px rgba(230,180,80,.9);}
.btn--cyan{background:var(--c-cyan);color:#04201b;border-color:var(--c-cyan);}
.btn--cyan:hover{background:#6bebd7;border-color:#6bebd7;box-shadow:0 0 26px -8px rgba(79,224,200,.9);}
.btn--sm{padding:.42rem .75rem;font-size:.8125rem;}
.btn--lg{padding:.85rem 1.5rem;font-size:.9375rem;}
.btn--block{width:100%;}

/* ---------- 7. 头部 ---------- */
.skip-link{
  position:absolute;left:1rem;top:-5rem;z-index:300;
  padding:.7rem 1.15rem;background:var(--c-amber);color:#171307;
  font-size:.875rem;font-weight:700;border-radius:var(--radius-s);
  transition:top .22s var(--ease);
}
.skip-link:focus{top:1rem;}

.site-header{
  position:fixed;inset:0 0 auto 0;z-index:120;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background-color .35s var(--ease),border-color .35s var(--ease),backdrop-filter .35s var(--ease);
}
.site-header[data-scrolled="true"]{
  background:rgba(20,23,25,.93);
  border-bottom-color:var(--line);
  backdrop-filter:blur(14px) saturate(120%);
}
body.is-nav-open .site-header{background:rgba(10,31,26,.98);border-bottom-color:var(--line);}

.scroll-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;pointer-events:none;}
.scroll-progress__bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--c-cyan),var(--c-amber));}

.site-header__inner{
  position:relative;z-index:2;
  max-width:var(--maxw);margin-inline:auto;
  padding-inline:var(--gutter);
  min-height:var(--header-h);
  display:flex;align-items:center;gap:clamp(.75rem,2vw,2rem);
}

/* 品牌 */
.brand{display:inline-flex;align-items:center;gap:.7rem;flex:0 0 auto;}
.brand__mark{
  font-family:var(--font-mono);font-size:.75rem;font-weight:700;letter-spacing:.12em;line-height:1;
  color:#04201b;background:var(--c-cyan);padding:.48rem .5rem;border-radius:var(--radius-s);
  box-shadow:0 0 0 1px rgba(79,224,200,.35),0 0 22px -6px rgba(79,224,200,.85);
}
.brand__text{display:flex;flex-direction:column;line-height:1.18;}
.brand__name{font-size:1.0625rem;font-weight:800;letter-spacing:.14em;color:var(--c-paper);}
.brand__sub{font-family:var(--font-mono);font-size:.5625rem;letter-spacing:.2em;text-transform:uppercase;color:var(--text-dim);}

/* 导航 */
.primary-nav{flex:1 1 auto;display:flex;justify-content:center;}
.primary-nav__list{display:flex;align-items:center;gap:clamp(.2rem,1.2vw,1rem);}
.primary-nav__link{
  position:relative;display:inline-flex;align-items:center;gap:.42rem;
  padding:.55rem .5rem;font-size:.9375rem;font-weight:600;color:var(--text-dim);
  border-radius:var(--radius-s);
  transition:color .25s var(--ease);
}
.primary-nav__index{font-family:var(--font-mono);font-size:.625rem;letter-spacing:.08em;color:rgba(58,68,65,1);transition:color .25s var(--ease);}
.primary-nav__link::after{
  content:"";position:absolute;left:.5rem;right:.5rem;bottom:.1rem;height:1px;
  background:var(--c-cyan);transform:scaleX(0);transform-origin:left;
  transition:transform .3s var(--ease);
}
.primary-nav__link:hover{color:var(--c-paper);}
.primary-nav__link:hover .primary-nav__index{color:var(--c-cyan);}
.primary-nav__link:hover::after{transform:scaleX(1);}
.primary-nav__link[aria-current="page"]{color:var(--c-paper);}
.primary-nav__link[aria-current="page"] .primary-nav__index{color:var(--c-amber);}
.primary-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--c-amber);}
.primary-nav__cta{display:none;}

/* 头部入口 */
.header-actions{display:flex;align-items:center;gap:.5rem;flex:0 0 auto;}

/* 移动菜单按钮 */
.nav-toggle{
  display:none;align-items:center;gap:.55rem;margin-left:auto;
  padding:.55rem .7rem;border:1px solid rgba(152,166,160,.35);border-radius:var(--radius-s);
  color:var(--text-dim);
  transition:border-color .25s var(--ease),color .25s var(--ease);
}
.nav-toggle:hover{border-color:var(--c-cyan);color:var(--c-cyan);}
.nav-toggle__bars{display:inline-flex;flex-direction:column;justify-content:center;gap:4px;width:16px;height:14px;}
.nav-toggle__bar{display:block;height:1.5px;width:100%;background:currentColor;transition:transform .28s var(--ease),opacity .2s var(--ease);}
.nav-toggle__label{font-family:var(--font-mono);font-size:.625rem;letter-spacing:.18em;text-transform:uppercase;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(5.5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-5.5px) rotate(-45deg);}

/* 移动 / 平板导航面板 */
@media (max-width:1023px){
  .nav-toggle{display:inline-flex;}
  .header-actions{display:none;}
  .primary-nav{
    position:fixed;left:0;right:0;top:var(--header-h);
    min-height:calc(100vh - var(--header-h));
    display:block;overflow-y:auto;
    padding:2rem var(--gutter) 3rem;
    background:linear-gradient(180deg,rgba(10,31,26,.99),rgba(20,23,25,.99));
    border-bottom:1px solid var(--line);
    opacity:0;visibility:hidden;transform:translateY(-14px);pointer-events:none;
    transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s;
  }
  .primary-nav[data-open="true"]{opacity:1;visibility:visible;transform:none;pointer-events:auto;}
  .primary-nav__list{flex-direction:column;align-items:stretch;gap:0;}
  .primary-nav__item{border-bottom:1px solid var(--line-soft);}
  .primary-nav__link{width:100%;justify-content:flex-start;padding:1.05rem .25rem;font-size:1.0625rem;color:var(--c-paper);}
  .primary-nav__link::after{display:none;}
  .primary-nav__link .primary-nav__index{min-width:2.4rem;font-size:.6875rem;color:var(--c-shale);}
  .primary-nav__cta{display:flex;flex-direction:column;gap:.75rem;margin-top:1.75rem;}
  body.is-nav-open{overflow:hidden;}
}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  position:relative;margin-top:auto;
  background:linear-gradient(180deg,rgba(10,31,26,.75),var(--c-coal) 42%,#0d1012);
  border-top:1px solid var(--line);
  color:var(--text-dim);
  font-size:.9375rem;
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(79,224,200,.85),rgba(230,180,80,.7),transparent);
}
.footer__inner{max-width:var(--maxw);margin-inline:auto;padding:clamp(2.75rem,5.5vw,4.25rem) var(--gutter) 1.75rem;}
.footer__grid{display:grid;grid-template-columns:1.5fr 1fr 1.35fr 1fr;gap:clamp(1.75rem,3.5vw,3rem);}
.footer__col{display:flex;flex-direction:column;gap:.9rem;}
.footer__col--brand{gap:1.1rem;padding-right:clamp(0rem,2vw,2rem);border-right:1px solid var(--line-soft);}
.brand--footer{margin-bottom:.2rem;}
.brand--footer .brand__name{font-size:1.125rem;}
.footer__desc{color:var(--text-soft);line-height:1.85;max-width:38ch;font-size:.9375rem;}
.footer__note{font-family:var(--font-mono);font-size:.625rem;letter-spacing:.22em;text-transform:uppercase;color:rgba(152,166,160,.65);}
.footer__title{display:flex;align-items:center;gap:.6rem;font-family:var(--font-mono);font-size:.6875rem;font-weight:600;letter-spacing:.22em;text-transform:uppercase;color:var(--c-paper);}
.footer__title::before{content:"";width:18px;height:1px;background:var(--c-cyan);flex:0 0 auto;}
.footer__list{display:flex;flex-direction:column;gap:.55rem;}
.footer__list--inline{flex-direction:row;flex-wrap:wrap;gap:.35rem 1.1rem;}
.footer__link{color:var(--text-dim);border-bottom:1px solid transparent;transition:color .25s var(--ease),border-color .25s var(--ease);}
.footer__link:hover{color:var(--c-cyan);border-bottom-color:currentColor;}
.footer__link--sm{font-size:.8125rem;}
.footer__contact{display:flex;flex-direction:column;gap:.2rem;}
.footer__contact-label{font-family:var(--font-mono);font-size:.625rem;letter-spacing:.2em;text-transform:uppercase;color:rgba(152,166,160,.6);}
.footer__contact-value{color:var(--c-paper);font-size:.9375rem;line-height:1.6;word-break:break-word;}
.footer__icp{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.1em;color:var(--c-amber);}
.footer__legal{
  display:flex;flex-wrap:wrap;gap:.6rem 1.5rem;align-items:center;justify-content:space-between;
  margin-top:clamp(2rem,4vw,3rem);padding-top:1.5rem;border-top:1px solid var(--line-soft);
  font-size:.8125rem;
}
.footer__copy{color:var(--text-dim);}
.footer__sep{color:var(--c-shale);margin-inline:.35rem;}

/* 返回顶部 */
.to-top{
  position:fixed;right:clamp(1rem,3vw,2rem);bottom:clamp(1rem,3vw,2rem);z-index:110;
  width:46px;height:46px;display:grid;place-items:center;
  border:1px solid var(--line);border-radius:50%;
  background:rgba(20,23,25,.94);color:var(--c-cyan);
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .3s var(--ease),transform .3s var(--ease),border-color .3s var(--ease),visibility .3s;
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none;}
.to-top:hover{border-color:var(--c-cyan);box-shadow:0 0 24px -8px rgba(79,224,200,.9);}
.to-top__icon{font-family:var(--font-mono);font-size:1rem;line-height:1;}

/* ---------- 9. 章节 / 索引轴 ---------- */
.chapter{
  display:flex;align-items:flex-start;gap:clamp(.9rem,2vw,1.5rem);
  padding-bottom:1.15rem;border-bottom:1px solid var(--line-soft);
  margin-bottom:clamp(1.5rem,3vw,2.5rem);
}
.chapter__num{
  font-family:var(--font-mono);font-size:clamp(1.75rem,4vw,2.75rem);font-weight:700;
  line-height:1;letter-spacing:.02em;color:rgba(79,224,200,.32);
}
.chapter__body{display:flex;flex-direction:column;gap:.4rem;}
.chapter__title{font-size:var(--fs-h3);font-weight:800;letter-spacing:.04em;color:var(--c-paper);}
.chapter__desc{color:var(--text-dim);font-size:.9375rem;max-width:62ch;}

.index-rail{position:sticky;top:calc(var(--header-h) + 1.5rem);border-left:1px solid var(--line);padding-left:1.25rem;}
.index-rail__label{display:block;font-family:var(--font-mono);font-size:.625rem;letter-spacing:.24em;text-transform:uppercase;color:var(--text-dim);margin-bottom:1rem;}
.index-rail__list{display:grid;gap:.15rem;}
.index-rail__link{
  display:flex;align-items:baseline;gap:.7rem;padding:.5rem .3rem;
  font-size:.875rem;font-weight:600;color:var(--text-dim);border-radius:var(--radius-s);
  transition:color .25s var(--ease),background-color .25s var(--ease);
}
.index-rail__link:hover{color:var(--c-cyan);background:rgba(36,74,61,.35);}
.index-rail__link[aria-current="true"]{color:var(--c-paper);background:rgba(36,74,61,.5);}
.index-rail__num{font-family:var(--font-mono);font-size:.625rem;letter-spacing:.08em;color:var(--c-shale);}
.index-rail__link[aria-current="true"] .index-rail__num{color:var(--c-cyan);}
@media (max-width:1023px){.index-rail{position:static;}}

/* ---------- 10. 卡片 / 标签 / 数据条 ---------- */
.card{
  position:relative;display:flex;flex-direction:column;gap:.75rem;
  padding:clamp(1.25rem,2.6vw,2rem);
  background:linear-gradient(155deg,rgba(36,74,61,.42),rgba(20,23,25,.94) 62%);
  border:1px solid var(--line);border-radius:var(--radius-organic);
  box-shadow:var(--shadow);overflow:hidden;
  transition:border-color .3s var(--ease),transform .3s var(--ease),box-shadow .3s var(--ease);
}
.card::after{
  content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  background:radial-gradient(420px 200px at 100% 0%,rgba(79,224,200,.1),transparent 70%);
  opacity:0;transition:opacity .3s var(--ease);
}
.card:hover{border-color:rgba(79,224,200,.5);transform:translateY(-3px);}
.card:hover::after{opacity:1;}
.card--flat{background:var(--c-coal);border-radius:var(--radius-m);box-shadow:none;}
.card__num{font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.2em;text-transform:uppercase;color:var(--c-cyan);}
.card__title{font-size:1.125rem;font-weight:700;color:var(--c-paper);letter-spacing:.03em;}
.card__text{color:var(--text-dim);font-size:.9375rem;line-height:1.8;}

.tag{
  display:inline-flex;align-items:center;gap:.35rem;padding:.22rem .62rem;
  border:1px solid var(--line);border-radius:999px;
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.1em;text-transform:uppercase;color:var(--text-dim);
}
.tag--cyan{color:var(--c-cyan);border-color:rgba(79,224,200,.45);background:rgba(79,224,200,.07);}
.tag--amber{color:var(--c-amber);border-color:rgba(230,180,80,.45);background:rgba(230,180,80,.07);}
.tag--rust{color:#C98080;border-color:rgba(140,59,59,.65);background:rgba(140,59,59,.14);}

.stat-strip{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(148px,1fr));
  gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius-m);overflow:hidden;
}
.stat{display:flex;flex-direction:column;gap:.35rem;padding:1rem 1.15rem;background:rgba(20,23,25,.94);}
.stat__label{font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.14em;text-transform:uppercase;color:var(--text-dim);}
.stat__value{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:1.375rem;font-weight:700;line-height:1.1;color:var(--c-paper);}
.stat--cyan .stat__value{color:var(--c-cyan);}
.stat--amber .stat__value{color:var(--c-amber);}
.stat--rust .stat__value{color:#C98080;}

/* ---------- 11. 表格 / 时间轴 / 手风琴 ---------- */
.data-table{font-size:.9375rem;}
.data-table caption{text-align:left;font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.16em;text-transform:uppercase;color:var(--text-dim);padding-bottom:.75rem;}
.data-table th,.data-table td{padding:.85rem 1rem;text-align:left;border-bottom:1px solid var(--line-soft);vertical-align:top;}
.data-table th{font-family:var(--font-mono);font-size:.6875rem;font-weight:500;letter-spacing:.14em;text-transform:uppercase;color:var(--text-dim);}
.data-table td{color:var(--c-paper);}
.data-table tbody tr:hover{background:rgba(36,74,61,.35);}
.data-table .num{color:var(--c-cyan);}

.timeline{position:relative;display:grid;gap:1.5rem;padding-left:1.75rem;}
.timeline::before{content:"";position:absolute;left:5px;top:.5rem;bottom:.5rem;width:1px;background:linear-gradient(180deg,transparent,var(--c-shale),transparent);}
.timeline__item{position:relative;}
.timeline__item::before{content:"";position:absolute;left:-1.75rem;top:.55rem;width:11px;height:11px;border-radius:50%;border:1px solid var(--c-cyan);background:var(--c-abyss);}
.timeline__meta{font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.14em;text-transform:uppercase;color:var(--text-dim);}

.accordion{border-top:1px solid var(--line);}
.accordion__item{border-bottom:1px solid var(--line);}
.accordion__trigger{width:100%;display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:1.15rem .25rem;text-align:left;font-weight:700;color:var(--c-paper);transition:color .25s var(--ease);}
.accordion__trigger:hover{color:var(--c-cyan);}
.accordion__trigger[aria-expanded="true"]{color:var(--c-cyan);}
.accordion__panel{padding:0 .25rem 1.25rem;color:var(--text-dim);font-size:.9375rem;}
.accordion__panel[hidden]{display:none;}

/* ---------- 12. 媒体容器 / 框景 ---------- */
.media{
  position:relative;overflow:hidden;isolation:isolate;aspect-ratio:16/9;
  border:1px solid var(--line);border-radius:var(--radius-organic);
  background:linear-gradient(140deg,#12271f,#141719 55%,#0d1012);
}
.media>img{width:100%;height:100%;object-fit:cover;}
.media--wide{aspect-ratio:21/9;}
.media--tall{aspect-ratio:4/5;}
.media--square{aspect-ratio:1/1;}
.media__caption{
  position:absolute;left:0;right:0;bottom:0;padding:1.75rem 1rem .8rem;
  background:linear-gradient(0deg,rgba(10,31,26,.95),rgba(10,31,26,0));
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.12em;text-transform:uppercase;color:var(--text-dim);
}
.media--grid::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(152,166,160,.09) 1px,transparent 1px),linear-gradient(90deg,rgba(152,166,160,.09) 1px,transparent 1px);
  background-size:32px 32px;
}
.media--placeholder{display:grid;place-items:center;}
.media--placeholder .media__hint{font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.2em;text-transform:uppercase;color:rgba(152,166,160,.6);}

.frame{position:relative;padding:clamp(1.5rem,3.5vw,3rem);border:1px solid var(--line);border-radius:var(--radius-organic);background:rgba(20,23,25,.6);}
.frame::before{content:"";position:absolute;inset:10px;border:1px solid rgba(79,224,200,.12);border-radius:inherit;pointer-events:none;}
.frame__corner{position:absolute;width:14px;height:14px;border:1px solid rgba(79,224,200,.75);}
.frame__corner--tl{top:-1px;left:-1px;border-right:0;border-bottom:0;}
.frame__corner--tr{top:-1px;right:-1px;border-left:0;border-bottom:0;}
.frame__corner--bl{bottom:-1px;left:-1px;border-right:0;border-top:0;}
.frame__corner--br{bottom:-1px;right:-1px;border-left:0;border-top:0;}

/* ---------- 13. 面包屑 / 正文 ---------- */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.12em;text-transform:uppercase;color:var(--text-dim);}
.breadcrumb a{color:var(--text-dim);border-bottom:1px solid transparent;transition:color .25s var(--ease),border-color .25s var(--ease);}
.breadcrumb a:hover{color:var(--c-cyan);border-bottom-color:currentColor;}
.breadcrumb__sep{color:var(--c-shale);}
.breadcrumb [aria-current="page"]{color:var(--c-paper);}

.prose{max-width:72ch;color:var(--text-soft);}
.prose h2{margin:2.25rem 0 .9rem;}
.prose h3{margin:1.75rem 0 .7rem;}
.prose ul,.prose ol{margin:0 0 1.25rem 1.1rem;display:grid;gap:.5rem;}
.prose ul>li{list-style:none;position:relative;padding-left:1.1rem;}
.prose ul>li::before{content:"";position:absolute;left:0;top:.72em;width:7px;height:1px;background:var(--c-cyan);}
.prose ol{counter-reset:item;list-style:none;}
.prose ol>li{counter-increment:item;position:relative;padding-left:1.9rem;}
.prose ol>li::before{content:counter(item,decimal-leading-zero);position:absolute;left:0;top:.1em;font-family:var(--font-mono);font-size:.75rem;letter-spacing:.08em;color:var(--c-cyan);}
.prose blockquote{margin:1.75rem 0;padding:.25rem 0 .25rem 1.25rem;border-left:2px solid var(--c-amber);color:var(--c-paper);}
.prose a{color:var(--c-cyan);border-bottom:1px solid rgba(79,224,200,.4);}
.prose a:hover{border-bottom-color:var(--c-cyan);}

/* ---------- 14. 动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;transition-delay:0ms!important;}
  [data-reveal]{transform:none;opacity:0;}
  [data-reveal].is-visible{opacity:1;}
  .stagger>*:nth-child(even){margin-top:0;}
  .card:hover{transform:none;}
  .scroll-progress__bar{transition:none;}
}