/* ============================================================
   竞博CN · 共享站点样式 /assets/site.css
   分区：reset → 变量 → 中文排版 → 头部 → 页脚 → 通用组件 → 响应式
   ============================================================ */

*,*::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,figcaption,blockquote,dl,dd,hr{margin:0}
ul,ol{list-style:none;padding:0}
img,svg,video,canvas{display:block;max-width:100%}
img{height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
a{color:inherit}
table{border-collapse:collapse;width:100%}

:root{
  --ink-deep:#071A2F;
  --ink-mid:#0B2743;
  --cyan:#26E0D0;
  --cyan-dim:#0F8E84;
  --orange:#FF6A2A;
  --orange-soft:#FF8B57;
  --violet:#7A3CFF;
  --violet-deep:#3A1B6B;
  --rock:#8C969B;
  --moss:#6E8B6B;
  --clay:#C77A5A;
  --paper:#F4EFE6;
  --paper-light:#FBF8F1;
  --ink:#0A0D12;
  --ink-mid-text:#4A5560;
  --text-hi:#F4EFE6;
  --text-mid:#C3CDD5;

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

  --radius-s:10px;
  --radius-m:18px;
  --radius-l:28px;
  --radius-pill:999px;

  --edge-cyan:1px solid rgba(38,224,208,.28);
  --edge-paper:1px solid rgba(10,13,18,.13);
  --shadow-card:0 22px 48px -34px rgba(7,26,47,.55);
  --shadow-float:0 26px 60px -30px rgba(7,26,47,.9);
  --ease:cubic-bezier(.22,.61,.36,1);

  --maxw:1180px;
  --pad-x:24px;
  --focus-color:var(--cyan);
}

/* ---------- 中文基础排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.8;
  letter-spacing:.01em;
  color:var(--ink);
  background:var(--paper-light);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.14;
  letter-spacing:-.01em;
  text-wrap:balance;
}
h1{font-size:clamp(30px,5.2vw,60px)}
h2{font-size:clamp(26px,4vw,44px)}
h3{font-size:clamp(20px,2.4vw,26px)}
p,li,dd,dt{word-break:break-word;overflow-wrap:anywhere}
p{text-wrap:pretty}
strong,b{font-weight:700}
:focus-visible{outline:3px solid var(--focus-color);outline-offset:3px;border-radius:6px}
.section--paper :focus-visible,
.section--paper-light :focus-visible,
.site-footer :focus-visible{outline-color:var(--cyan)}
::selection{background:rgba(38,224,208,.32);color:var(--ink-deep)}

.visually-hidden{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}
.mono{font-family:var(--font-mono);letter-spacing:.04em}
.serif-accent{font-family:var(--font-serif);font-weight:600;letter-spacing:.01em}

.container{
  width:100%;
  max-width:calc(var(--maxw) + var(--pad-x) * 2);
  margin-inline:auto;
  padding-inline:var(--pad-x);
}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;left:16px;top:-120px;z-index:300;
  display:inline-flex;align-items:center;min-height:44px;
  padding:10px 22px;border-radius:var(--radius-pill);
  background:var(--cyan);color:#04121F;
  font-family:var(--font-display);font-weight:800;font-size:15px;text-decoration:none;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:14px}

/* ---------- 滚动进度 ---------- */
.scroll-progress{
  position:fixed;left:0;right:0;top:0;height:3px;z-index:250;
  background:rgba(38,224,208,.14);pointer-events:none;
}
.scroll-progress-bar{
  display:block;height:100%;width:100%;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--violet) 52%,var(--orange) 100%);
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .12s linear;
}

/* ---------- 头部：悬浮胶囊浮岛 ---------- */
.site-header{
  position:sticky;top:0;z-index:200;
  padding:14px 16px 0;
  background:linear-gradient(180deg,rgba(7,26,47,.55) 0%,rgba(7,26,47,0) 100%);
}
.header-inner{
  position:relative;
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  max-width:var(--maxw);
  margin-inline:auto;
  padding:9px 12px 9px 16px;
  border-radius:var(--radius-pill);
  background:
    radial-gradient(120% 180% at 8% 0%,rgba(122,60,255,.28),transparent 58%),
    rgba(7,26,47,.86);
  border:var(--edge-cyan);
  box-shadow:var(--shadow-float),inset 0 1px 0 rgba(38,224,208,.18);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  transition:background .25s var(--ease),box-shadow .25s var(--ease);
}
.site-header[data-stuck] .header-inner{
  background:
    radial-gradient(120% 180% at 8% 0%,rgba(122,60,255,.34),transparent 58%),
    rgba(7,26,47,.96);
  box-shadow:0 26px 54px -28px rgba(0,0,0,.9),inset 0 1px 0 rgba(38,224,208,.26);
}

.brand{
  display:inline-flex;align-items:center;gap:12px;
  min-height:44px;text-decoration:none;color:var(--text-hi);
  border-radius:var(--radius-pill);
}
.brand-mark{
  display:grid;place-items:center;
  width:40px;height:40px;flex:0 0 auto;
  border-radius:14px;
  background:linear-gradient(150deg,var(--ink-mid),#063B49);
  border:1px solid rgba(38,224,208,.5);
  color:var(--cyan);
  font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.06em;
  box-shadow:inset 0 0 14px rgba(38,224,208,.25);
  transition:transform .25s var(--ease),box-shadow .25s var(--ease);
}
.brand:hover .brand-mark{transform:rotate(-6deg);box-shadow:inset 0 0 18px rgba(38,224,208,.45)}
.brand-text{display:flex;flex-direction:column;gap:2px}
.brand-name{
  font-family:var(--font-display);font-weight:900;font-size:20px;
  line-height:1.1;letter-spacing:.02em;
}
.brand-sub{
  font-family:var(--font-mono);font-size:10.5px;line-height:1.4;
  letter-spacing:.2em;color:var(--rock);
}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  min-height:44px;min-width:44px;padding:9px 15px;
  border-radius:var(--radius-pill);
  border:1px solid rgba(38,224,208,.4);
  background:rgba(38,224,208,.08);
  color:var(--cyan);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;
  transition:background .18s var(--ease),border-color .18s var(--ease);
}
.nav-toggle:hover{background:rgba(38,224,208,.18);border-color:var(--cyan)}
.nav-toggle-icon{display:grid;gap:5px;width:16px}
.nav-toggle-bar{
  display:block;width:16px;height:2px;border-radius:2px;background:currentColor;
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child{transform:translateY(3.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:last-child{transform:translateY(-3.5px) rotate(-45deg)}
.nav-toggle-label{line-height:1}

.site-nav{display:flex;align-items:center;gap:10px}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-item{display:flex}
.nav-link{
  display:inline-flex;align-items:center;min-height:44px;
  padding:9px 13px;border-radius:var(--radius-pill);
  color:var(--text-mid);text-decoration:none;
  font-family:var(--font-display);font-weight:500;font-size:14.5px;letter-spacing:.02em;
  transition:color .18s var(--ease),background-color .18s var(--ease),box-shadow .18s var(--ease);
}
.nav-link:hover{color:var(--cyan);background:rgba(38,224,208,.1)}
.nav-link[aria-current="page"]{
  color:var(--cyan);font-weight:700;
  background:rgba(38,224,208,.14);
  box-shadow:inset 0 0 0 1px rgba(38,224,208,.45);
}
.nav-cta{
  display:inline-flex;align-items:center;justify-content:center;min-height:44px;
  padding:10px 20px;border-radius:var(--radius-pill);
  background:var(--orange);color:#200A02;
  font-family:var(--font-display);font-weight:800;font-size:14.5px;letter-spacing:.04em;
  text-decoration:none;
  box-shadow:0 14px 26px -16px rgba(255,106,42,.95);
  transition:background-color .18s var(--ease),transform .18s var(--ease);
}
.nav-cta:hover{background:var(--orange-soft);transform:translateY(-1px)}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:88px;
  padding-top:8px;
  color:var(--text-hi);
  background:
    radial-gradient(120% 90% at 92% 0%,rgba(122,60,255,.3),transparent 62%),
    radial-gradient(90% 80% at 0% 100%,rgba(38,224,208,.16),transparent 66%),
    var(--ink-deep);
  border-top:1px solid rgba(38,224,208,.26);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(140,150,155,.14) 1px,transparent 1px),
    linear-gradient(90deg,rgba(140,150,155,.14) 1px,transparent 1px);
  background-size:52px 52px;
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.85),transparent 82%);
  mask-image:linear-gradient(180deg,rgba(0,0,0,.85),transparent 82%);
}
.site-footer::after{
  content:"";position:absolute;left:0;right:0;top:0;height:3px;
  background:linear-gradient(90deg,var(--cyan),var(--violet) 55%,var(--orange));
  opacity:.85;
}
.footer-grid{
  position:relative;z-index:1;
  max-width:calc(var(--maxw) + 48px);
  margin-inline:auto;
  padding:64px 24px 40px;
  display:grid;
  grid-template-columns:1.5fr 1fr 1.1fr;
  gap:44px;
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:14px}
.footer-wordmark{
  font-family:var(--font-display);font-weight:900;font-size:34px;line-height:1.05;
  letter-spacing:-.01em;color:var(--text-hi);
}
.footer-wordmark-accent{color:var(--cyan);margin-left:4px}
.footer-tagline{
  font-family:var(--font-serif);font-weight:600;font-size:17px;letter-spacing:.04em;
  color:var(--paper);
}
.footer-note{
  max-width:30em;font-size:14px;line-height:1.85;color:var(--rock);
}
.footer-cta{
  display:inline-flex;align-items:center;gap:8px;
  min-height:46px;padding:11px 22px;margin-top:4px;
  border-radius:var(--radius-pill);
  background:var(--orange);color:#200A02;
  font-family:var(--font-display);font-weight:800;font-size:15px;letter-spacing:.04em;
  text-decoration:none;
  box-shadow:0 18px 32px -20px rgba(255,106,42,.95);
  transition:background-color .18s var(--ease),transform .18s var(--ease);
}
.footer-cta:hover{background:var(--orange-soft);transform:translateY(-1px)}
.footer-cta::after{content:"→";font-family:var(--font-mono)}

.footer-col{display:flex;flex-direction:column;gap:14px;min-width:0}
.footer-heading{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.24em;text-transform:uppercase;
  color:var(--cyan);
  padding-bottom:10px;
  border-bottom:1px solid rgba(140,150,155,.24);
}
.footer-list{display:flex;flex-direction:column;gap:2px}
.footer-link{
  display:inline-flex;align-items:center;min-height:40px;
  font-size:15px;color:var(--text-mid);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease),padding-left .18s var(--ease);
}
.footer-link:hover{color:var(--cyan);border-bottom-color:rgba(38,224,208,.6);padding-left:4px}

.footer-contact{display:flex;flex-direction:column;gap:10px;margin-top:6px}
.footer-contact-item{
  display:grid;grid-template-columns:46px 1fr;gap:10px;align-items:start;
  font-size:13.5px;line-height:1.7;
}
.footer-contact-label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:var(--moss);padding-top:3px;
}
.footer-contact-value{color:var(--text-mid);overflow-wrap:anywhere}

.footer-bottom{
  position:relative;z-index:1;
  max-width:calc(var(--maxw) + 48px);
  margin-inline:auto;
  padding:22px 24px 42px;
  border-top:1px solid rgba(140,150,155,.26);
  display:flex;flex-wrap:wrap;align-items:center;gap:14px 24px;
  justify-content:space-between;
  font-size:13px;color:var(--rock);
}
.footer-legal{margin:0}
.footer-meta-note{margin:0;color:rgba(140,150,155,.92)}
.to-top{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:9px 18px;
  border-radius:var(--radius-pill);
  border:1px solid rgba(38,224,208,.45);
  background:rgba(38,224,208,.08);
  color:var(--cyan);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  transition:background-color .18s var(--ease),border-color .18s var(--ease);
}
.to-top:hover{background:rgba(38,224,208,.2);border-color:var(--cyan)}
.to-top::before{content:"↑"}

/* ---------- 分区与标题体系 ---------- */
.section{position:relative;padding:72px 0}
.section--dark{background:var(--ink-deep);color:var(--text-hi)}
.section--band{background:var(--ink-mid);color:var(--text-hi)}
.section--paper{background:var(--paper);color:var(--ink)}
.section--paper-light{background:var(--paper-light);color:var(--ink)}
.section-title{font-size:clamp(26px,4vw,44px);margin:0}
.section-lead{max-width:38em;margin-top:16px;font-size:17px;line-height:1.85;color:var(--ink-mid-text)}
.section--dark .section-lead,.section--band .section-lead{color:var(--text-mid)}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;margin-bottom:16px;
  font-family:var(--font-mono);font-size:12px;font-weight:600;
  letter-spacing:.24em;text-transform:uppercase;color:var(--moss);
}
.eyebrow::before{content:"";width:26px;height:2px;border-radius:2px;background:var(--orange)}
.section--dark .eyebrow,.section--band .eyebrow{color:var(--cyan)}
.rule{
  height:1px;border:0;margin:44px 0;
  background:linear-gradient(90deg,transparent,rgba(140,150,155,.55),transparent);
}
.section--dark .rule,.section--band .rule{background:linear-gradient(90deg,transparent,rgba(38,224,208,.4),transparent)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:48px;padding:12px 26px;
  border:1px solid transparent;border-radius:var(--radius-pill);
  font-family:var(--font-display);font-weight:800;font-size:15.5px;line-height:1.2;letter-spacing:.03em;
  text-decoration:none;cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease),
             border-color .18s var(--ease),transform .18s var(--ease),box-shadow .18s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--primary{background:var(--orange);color:#200A02;box-shadow:0 18px 32px -22px rgba(255,106,42,.95)}
.btn--primary:hover{background:var(--orange-soft)}
.btn--ghost{background:transparent;color:var(--cyan);border-color:rgba(38,224,208,.5)}
.btn--ghost:hover{background:rgba(38,224,208,.12);border-color:var(--cyan)}
.btn--ink{background:var(--ink-deep);color:var(--paper)}
.btn--ink:hover{background:var(--ink-mid)}
.btn--paper{background:var(--paper-light);color:var(--ink);border-color:rgba(10,13,18,.16)}
.btn--paper:hover{background:#fff}

/* ---------- 编号徽章与标签 ---------- */
.badge{
  display:inline-grid;place-items:center;
  min-width:32px;height:32px;padding:0 9px;
  border-radius:10px;
  background:rgba(38,224,208,.14);
  border:1px solid rgba(38,224,208,.42);
  color:var(--cyan);
  font-family:var(--font-mono);font-size:13px;font-weight:600;line-height:1;
  letter-spacing:.04em;
}
.badge--solid{background:var(--ink-deep);color:var(--cyan);border-color:rgba(38,224,208,.5)}
.badge--orange{background:var(--orange);color:#200A02;border-color:transparent}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 13px;border-radius:var(--radius-pill);
  border:1px solid rgba(10,13,18,.16);
  background:var(--paper-light);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;
  color:var(--ink-mid-text);
}
.tag--clay{background:rgba(199,122,90,.16);border-color:rgba(199,122,90,.5);color:#7A3B22}
.tag--moss{background:rgba(110,139,107,.18);border-color:rgba(110,139,107,.5);color:#3C523A}
.tag--cyan{background:rgba(38,224,208,.16);border-color:rgba(38,224,208,.55);color:#08544E}
.section--dark .tag,.section--band .tag{background:rgba(38,224,208,.1);border-color:rgba(38,224,208,.35);color:var(--text-mid)}

/* ---------- 筛选 ---------- */
.filter-bar{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.filter-btn{
  display:inline-flex;align-items:center;gap:8px;
  min-height:44px;padding:9px 18px;
  border-radius:var(--radius-pill);
  border:1px solid rgba(38,224,208,.35);
  background:transparent;color:var(--text-mid);
  font-family:var(--font-body);font-size:14px;letter-spacing:.03em;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.section--paper .filter-btn,.section--paper-light .filter-btn{
  border-color:rgba(10,13,18,.18);color:var(--ink-mid-text);
}
.filter-btn:hover{border-color:var(--cyan);color:var(--cyan)}
.section--paper .filter-btn:hover,.section--paper-light .filter-btn:hover{color:var(--cyan-dim);border-color:var(--cyan-dim)}
.filter-btn[aria-pressed="true"]{
  background:var(--cyan);border-color:var(--cyan);color:#04121F;font-weight:700;
}
.filter-count{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  padding:2px 7px;border-radius:var(--radius-pill);
  background:rgba(38,224,208,.18);color:var(--cyan);
}
.filter-btn[aria-pressed="true"] .filter-count{background:rgba(4,18,31,.2);color:#04121F}
.filter-empty{
  padding:32px 24px;margin-top:20px;
  border:1px dashed rgba(140,150,155,.7);
  border-radius:var(--radius-m);
  color:var(--rock);text-align:center;font-size:15px;
}

/* ---------- 卡片 ---------- */
.card{
  position:relative;
  padding:26px;
  border-radius:var(--radius-l);
  background:var(--paper-light);
  border:var(--edge-paper);
  box-shadow:var(--shadow-card);
  color:var(--ink);
}
.card--paper{background:var(--paper)}
.card--dark{
  background:linear-gradient(160deg,rgba(11,39,67,.98),rgba(7,26,47,.99));
  border-color:rgba(38,224,208,.24);
  color:var(--text-hi);
  box-shadow:var(--shadow-float);
}
.card--notch::after{
  content:"";position:absolute;left:26px;right:26px;bottom:0;height:3px;
  border-radius:3px 3px 0 0;
  background:linear-gradient(90deg,var(--cyan),var(--violet) 55%,var(--orange));
}
.card-title{font-family:var(--font-display);font-weight:800;font-size:20px;line-height:1.35;margin:0}
.card-text{margin-top:12px;font-size:15.5px;line-height:1.78;color:var(--ink-mid-text)}
.card--dark .card-text{color:var(--text-mid)}

/* ---------- 栅格与错落流 ---------- */
.grid{display:grid;gap:20px}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.flow{display:flex;flex-wrap:wrap;gap:20px;align-items:flex-start}
.flow > *{flex:1 1 280px;min-width:0}

/* ---------- 图文容器 ---------- */
.media-frame{
  position:relative;overflow:hidden;
  border-radius:var(--radius-m);
  border:var(--edge-paper);
  background:
    radial-gradient(120% 120% at 80% 0%,rgba(122,60,255,.55),transparent 60%),
    linear-gradient(150deg,var(--ink-mid),var(--ink-deep));
  aspect-ratio:16/9;
  margin:0;
}
.section--dark .media-frame,.section--band .media-frame{border-color:rgba(38,224,208,.28)}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame figcaption{
  position:absolute;left:14px;bottom:14px;
  padding:6px 12px;border-radius:var(--radius-pill);
  background:rgba(7,26,47,.82);color:var(--text-mid);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;
  backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--portrait{aspect-ratio:3/4}

/* ---------- 面包屑 ---------- */
.breadcrumbs{padding:20px 0}
.breadcrumbs-list{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:var(--rock);
}
.breadcrumbs-list li{display:flex;align-items:center;gap:8px}
.breadcrumbs-list li + li::before{content:"/";color:rgba(140,150,155,.75)}
.crumb-link{
  color:inherit;text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.crumb-link:hover{color:var(--cyan-dim);border-bottom-color:currentColor}
.breadcrumbs [aria-current="page"]{color:var(--ink);font-weight:600}
.breadcrumbs--on-dark .breadcrumbs-list{color:var(--rock)}
.breadcrumbs--on-dark .crumb-link:hover{color:var(--cyan)}
.breadcrumbs--on-dark [aria-current="page"]{color:var(--paper)}

/* ---------- 手风琴 ---------- */
.acc{display:flex;flex-direction:column;gap:12px}
.acc-item{
  border-radius:var(--radius-m);
  background:var(--paper-light);
  border:var(--edge-paper);
  overflow:hidden;
}
.acc-trigger{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  width:100%;min-height:58px;padding:16px 20px;
  font-family:var(--font-display);font-weight:700;font-size:17px;line-height:1.5;
  text-align:left;color:var(--ink);
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.acc-trigger:hover{color:var(--cyan-dim);background:rgba(38,224,208,.06)}
.acc-trigger::after{
  content:"＋";flex:0 0 auto;
  font-family:var(--font-mono);font-size:18px;color:var(--orange);
  transition:transform .2s var(--ease);
}
.acc-trigger[aria-expanded="true"]::after{content:"－";color:var(--cyan-dim)}
.acc-panel{padding:0 20px 20px;font-size:15.5px;line-height:1.85;color:var(--ink-mid-text)}
.acc-panel[hidden]{display:none}

/* ---------- 滚动浮现 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}
[data-reveal][data-revealed]{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .footer-grid{grid-template-columns:1.3fr 1fr 1fr;gap:32px}
}
@media (max-width:960px){
  :root{--pad-x:20px}
  .site-header{padding:10px 12px 0}
  .header-inner{padding:8px 10px 8px 14px;border-radius:26px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;left:0;right:0;top:calc(100% + 10px);
    display:none;flex-direction:column;align-items:stretch;gap:14px;
    padding:16px;
    border-radius:24px;
    background:
      radial-gradient(120% 120% at 100% 0%,rgba(122,60,255,.32),transparent 62%),
      rgba(7,26,47,.98);
    border:var(--edge-cyan);
    box-shadow:0 34px 64px -32px rgba(0,0,0,.95);
  }
  .site-nav[data-open]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:4px;width:100%}
  .nav-link{
    width:100%;justify-content:flex-start;
    padding:14px 16px;border-radius:16px;font-size:16px;
  }
  .nav-cta{width:100%;min-height:48px;padding:14px 20px;font-size:15.5px}
  .section{padding:56px 0}
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px 28px;padding:52px 20px 32px}
  .footer-brand{grid-column:1 / -1}
  .footer-bottom{padding:20px 20px 36px}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:720px){
  body{font-size:16.5px}
  .brand-sub{display:none}
  .brand-name{font-size:18px}
  .brand-mark{width:36px;height:36px;border-radius:12px}
  .grid--2,.grid--3,.grid--4{grid-template-columns:1fr}
  .flow > *{flex-basis:100%}
  .card{padding:22px;border-radius:22px}
  .footer-wordmark{font-size:28px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:12px}
  .to-top{width:100%}
  .section{padding:48px 0}
}
@media (max-width:420px){
  .nav-toggle-label{display:none}
  .footer-grid{grid-template-columns:1fr}
}

/* ---------- 可访问性：减少动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  [data-reveal]{opacity:1;transform:none}
  .btn:hover,.nav-cta:hover,.footer-cta:hover,.brand:hover .brand-mark{transform:none}
}