/* ============ 1. reset ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,picture{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ============ 2. 变量 ============ */
:root{
  --xc-deep:#0A0B2E;
  --xc-cabin:#171A4A;
  --xc-orbit:#2B2F7A;
  --xc-nebula:#4B4FE0;
  --xc-aurora:#8B7CF6;
  --xc-gold:#F5B93B;
  --xc-data:#35E0D0;
  --xc-paper:#F6F4EF;
  --xc-star:#E9EEFF;
  --xc-mist:#9AA1CE;
  --xc-ink:#14152F;
  --xc-coral:#FF6F8B;

  --xc-line:rgba(154,161,206,.22);
  --xc-line-strong:rgba(154,161,206,.42);
  --xc-glass:rgba(23,26,74,.74);

  --xc-font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --xc-font-body:var(--xc-font-display);
  --xc-font-mono:ui-monospace,"JetBrains Mono","IBM Plex Mono",SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --xc-wrap-width:1240px;
  --xc-head-h:118px;
  --xc-rule-h:48px;
  --xc-r-sm:10px;
  --xc-r-md:18px;
  --xc-r-lg:28px;
  --xc-r-pill:999px;
}

/* ============ 3. 基础排版与背景 ============ */
body{
  background-color:var(--xc-deep);
  background-image:
    radial-gradient(1100px 620px at 78% -8%, rgba(75,79,224,.34), transparent 62%),
    radial-gradient(760px 520px at 4% 10%, rgba(139,124,246,.16), transparent 66%),
    radial-gradient(900px 700px at 50% 118%, rgba(53,224,208,.10), transparent 60%);
  background-repeat:no-repeat;
  background-size:100% 100%,100% 100%,100% 100%;
  color:var(--xc-star);
  font-family:var(--xc-font-body);
  font-size:16px;
  line-height:1.9;
  letter-spacing:.01em;
  min-height:100vh;
  padding-top:var(--xc-head-h);
  padding-bottom:0;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{line-height:1.16;font-weight:800;letter-spacing:-.02em}
.xc-wrap{width:100%;max-width:var(--xc-wrap-width);margin:0 auto;padding:0 clamp(16px,3vw,32px)}

/* ============ 4. skip link ============ */
.xc-skip{
  position:fixed;top:10px;left:12px;z-index:300;
  transform:translateY(-180%);
  background:var(--xc-gold);color:var(--xc-ink);
  padding:10px 20px;border-radius:var(--xc-r-pill);
  font-size:14px;font-weight:800;
  transition:transform .18s ease;
}
.xc-skip:focus{transform:translateY(0)}

/* ============ 5. header ============ */
.xc-header{
  position:fixed;top:0;left:0;right:0;z-index:140;
  padding:16px clamp(12px,3vw,32px) 0;
}
.xc-header__inner{
  position:relative;
  max-width:var(--xc-wrap-width);
  margin:0 auto;
  display:flex;align-items:center;gap:14px;
  padding:10px 12px 10px 20px;
  border-radius:var(--xc-r-pill);
  background:linear-gradient(180deg,rgba(23,26,74,.92),rgba(10,11,46,.86));
  border:1px solid var(--xc-line-strong);
  box-shadow:0 18px 44px -22px rgba(0,0,0,.85), inset 0 1px 0 rgba(233,238,255,.06);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
  transition:padding .24s ease,box-shadow .24s ease,background .24s ease;
}
.xc-header[data-scrolled] .xc-header__inner{
  padding:6px 10px 6px 16px;
  background:linear-gradient(180deg,rgba(17,20,64,.97),rgba(10,11,46,.95));
  box-shadow:0 22px 48px -24px rgba(0,0,0,.95), inset 0 1px 0 rgba(233,238,255,.09);
}
.xc-progress{
  position:absolute;left:18px;bottom:-1px;height:2px;width:0;
  max-width:calc(100% - 36px);
  border-radius:2px;
  background:linear-gradient(90deg,var(--xc-data),var(--xc-gold));
  transition:width .12s linear;
}

/* 品牌 */
.xc-brand{display:flex;align-items:center;gap:12px;flex:0 0 auto;padding:4px 6px;border-radius:var(--xc-r-pill)}
.xc-brand__mark{
  position:relative;flex:0 0 auto;
  width:32px;height:32px;border-radius:50%;
  background:radial-gradient(circle at 32% 30%, var(--xc-aurora), var(--xc-nebula) 52%, var(--xc-cabin) 100%);
  border:1px solid rgba(233,238,255,.3);
  box-shadow:0 0 0 4px rgba(75,79,224,.16);
}
.xc-brand__mark::after{
  content:"";position:absolute;right:4px;bottom:6px;
  width:8px;height:8px;border-radius:50%;
  background:var(--xc-gold);
  box-shadow:0 0 10px rgba(245,185,59,.9);
  animation:xc-breathe 9s ease-in-out infinite;
}
.xc-brand__text{display:flex;flex-direction:column;line-height:1.15}
.xc-brand__name{font-size:17px;font-weight:800;letter-spacing:-.02em;color:var(--xc-star)}
.xc-brand__sub{font-family:var(--xc-font-mono);font-size:9.5px;letter-spacing:.2em;color:var(--xc-mist)}

/* 导航 */
.xc-nav{margin-left:auto;min-width:0}
.xc-nav__list{display:flex;align-items:center;gap:4px}
.xc-nav__item{display:block}
.xc-nav__link{
  position:relative;display:block;
  padding:9px 15px;border-radius:var(--xc-r-pill);
  font-size:14.5px;font-weight:600;color:var(--xc-star);
  opacity:.8;
  transition:background .2s ease,opacity .2s ease,color .2s ease;
}
.xc-nav__link:hover{background:rgba(139,124,246,.18);opacity:1}
.xc-nav__link[aria-current="page"]{
  background:var(--xc-nebula);opacity:1;color:#fff;
  box-shadow:0 10px 24px -14px rgba(75,79,224,.95);
}
.xc-nav__link[aria-current="page"]::after{
  content:"";position:absolute;top:6px;right:9px;
  width:6px;height:6px;border-radius:50%;background:var(--xc-gold);
}

/* 工具区 */
.xc-utility{display:flex;align-items:center;gap:8px;flex:0 0 auto;margin-left:6px}
.xc-pager{
  display:flex;align-items:center;gap:4px;
  padding:4px 5px;border-radius:var(--xc-r-pill);
  background:rgba(10,11,46,.62);
  border:1px solid var(--xc-line);
}
.xc-pager__btn{
  width:30px;height:30px;display:grid;place-items:center;
  border-radius:50%;font-size:14px;color:var(--xc-data);
  border:1px solid transparent;
  transition:background .18s ease,border-color .18s ease,color .18s ease;
}
.xc-pager__btn:hover{background:rgba(53,224,208,.14);border-color:rgba(53,224,208,.42);color:var(--xc-data)}
.xc-pager__count{
  min-width:60px;text-align:center;
  font-family:var(--xc-font-mono);font-size:12px;
  font-variant-numeric:tabular-nums;
  color:var(--xc-mist);
}
.xc-burger{
  display:none;align-items:center;gap:9px;
  padding:9px 16px;border-radius:var(--xc-r-pill);
  background:rgba(75,79,224,.22);
  border:1px solid var(--xc-line-strong);
  color:var(--xc-star);font-size:14px;font-weight:700;
  cursor:pointer;
  transition:background .2s ease,border-color .2s ease;
}
.xc-burger:hover{background:rgba(75,79,224,.4);border-color:var(--xc-aurora)}
.xc-burger__bars{display:grid;gap:4px;width:16px}
.xc-burger__bars i{display:block;height:2px;border-radius:2px;background:currentColor;transition:transform .2s ease,opacity .2s ease}
.xc-burger[aria-expanded="true"] .xc-burger__bars i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.xc-burger[aria-expanded="true"] .xc-burger__bars i:nth-child(2){opacity:0}
.xc-burger[aria-expanded="true"] .xc-burger__bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.xc-burger__label{white-space:nowrap}

/* 胶囊下方注释 */
.xc-header__note{
  max-width:var(--xc-wrap-width);
  margin:9px auto 0;
  padding:0 clamp(18px,3vw,38px);
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.08em;color:var(--xc-mist);
}
.xc-header__noteitem{display:inline-flex;align-items:center;gap:6px}
.xc-section-label{color:var(--xc-data);font-family:var(--xc-font-mono);font-weight:700;letter-spacing:.12em}
.xc-header__sep{opacity:.45}
.xc-header__notelink{color:var(--xc-aurora);border-bottom:1px solid rgba(139,124,246,.5);padding-bottom:1px}
.xc-header__notelink:hover{color:var(--xc-gold);border-color:var(--xc-gold)}

/* ============ 6. 规则说明条 ============ */
.xc-rulebar{
  position:fixed;left:0;right:0;bottom:0;z-index:150;
  height:var(--xc-rule-h);
  background:linear-gradient(180deg,rgba(23,26,74,.95),rgba(10,11,46,.99));
  border-top:1px solid var(--xc-line-strong);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}
.xc-rulebar__inner{
  max-width:var(--xc-wrap-width);height:100%;margin:0 auto;
  padding:0 clamp(16px,3vw,32px);
  display:flex;align-items:center;gap:12px;
  font-size:12px;color:var(--xc-mist);
  overflow-x:auto;white-space:nowrap;
  scrollbar-width:none;
}
.xc-rulebar__inner::-webkit-scrollbar{display:none}
.xc-rulebar__chip{
  flex:0 0 auto;
  font-family:var(--xc-font-mono);font-size:10px;letter-spacing:.22em;
  padding:3px 10px;border-radius:var(--xc-r-pill);
  background:rgba(245,185,59,.14);
  border:1px solid rgba(245,185,59,.42);
  color:var(--xc-gold);
}
.xc-rulebar__link{flex:0 0 auto;color:var(--xc-star);border-bottom:1px dashed var(--xc-line-strong)}
.xc-rulebar__link:hover{color:var(--xc-data);border-bottom-color:var(--xc-data)}
.xc-rulebar__now{flex:0 0 auto}
.xc-rulebar__now b{color:var(--xc-data);font-family:var(--xc-font-mono);font-weight:700;letter-spacing:.1em}
.xc-rulebar__sep{flex:0 0 auto;opacity:.4}

/* ============ 7. footer ============ */
.xc-footer{
  position:relative;
  margin-top:clamp(56px,9vw,120px);
  padding:clamp(44px,6vw,84px) 0 calc(var(--xc-rule-h) + 34px);
  background:linear-gradient(180deg,var(--xc-cabin),var(--xc-deep) 82%);
  border-top:1px solid var(--xc-line-strong);
  overflow:hidden;
}
.xc-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(680px 340px at 88% 0%, rgba(75,79,224,.28), transparent 68%),
    radial-gradient(520px 300px at 4% 100%, rgba(53,224,208,.12), transparent 70%);
}
.xc-footer > *{position:relative;z-index:1}
.xc-footer__top{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:26px;
  padding-bottom:clamp(26px,4vw,46px);
  border-bottom:1px solid var(--xc-line);
}
.xc-footer__brand{max-width:640px}
.xc-footer__wordmark{
  font-size:clamp(40px,7vw,84px);
  font-weight:900;letter-spacing:-.04em;line-height:.95;
  background:linear-gradient(120deg,var(--xc-star) 8%,var(--xc-aurora) 52%,var(--xc-data) 96%);
  -webkit-background-clip:text;background-clip:text;
  color:transparent;
}
.xc-footer__tagline{margin-top:12px;font-size:15px;color:var(--xc-star);opacity:.86}
.xc-footer__meta{margin-top:8px;font-family:var(--xc-font-mono);font-size:12px;letter-spacing:.08em;color:var(--xc-mist);font-variant-numeric:tabular-nums}
.xc-footer__cta{display:flex;flex-wrap:wrap;gap:12px}
.xc-footer__cols{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
  gap:clamp(20px,3vw,32px);
  padding-top:clamp(30px,4vw,52px);
  padding-bottom:clamp(26px,4vw,44px);
}
.xc-footer__col{min-width:0}
.xc-footer__coltitle{
  font-size:17px;font-weight:800;letter-spacing:-.01em;color:var(--xc-star);
  padding-bottom:10px;margin-bottom:14px;
  border-bottom:1px solid var(--xc-line);
}
.xc-footer__links{display:grid;gap:9px}
.xc-footer__link{
  display:inline-block;
  font-size:14px;color:var(--xc-mist);
  transition:color .18s ease,transform .18s ease;
}
.xc-footer__link:hover{color:var(--xc-data);transform:translateX(4px)}
.xc-footer__contact{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(230px,1fr));
  gap:16px 28px;
  padding-top:clamp(20px,3vw,30px);
  padding-bottom:clamp(20px,3vw,30px);
  border-top:1px solid var(--xc-line);
}
.xc-footer__contactitem{font-size:13.5px;line-height:1.7;color:var(--xc-mist)}
.xc-footer__contactitem b{
  display:block;margin-bottom:4px;
  font-family:var(--xc-font-mono);font-size:10.5px;font-weight:600;
  letter-spacing:.22em;text-transform:uppercase;color:var(--xc-gold);
}
.xc-footer__contactitem strong{color:var(--xc-star);font-weight:600}
.xc-footer__legal{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 20px;
  padding-top:20px;
  border-top:1px solid var(--xc-line);
  font-family:var(--xc-font-mono);font-size:12px;letter-spacing:.06em;
  color:var(--xc-mist);
}
.xc-footer__legalink{border-bottom:1px solid var(--xc-line-strong);transition:color .18s ease,border-color .18s ease}
.xc-footer__legalink:hover{color:var(--xc-data);border-bottom-color:var(--xc-data)}
.xc-footer__copy{margin-left:auto}
.xc-footer__icp{color:var(--xc-mist);opacity:.85}

/* ============ 8. 通用内容组件 ============ */
.xc-section{padding:clamp(46px,7vw,96px) 0}
.xc-section__index{font-family:var(--xc-font-mono);font-size:12px;letter-spacing:.26em;color:var(--xc-gold)}
.xc-section__title{margin-top:12px;font-size:clamp(30px,4.4vw,52px);font-weight:900;letter-spacing:-.03em;line-height:1.08;color:var(--xc-star)}
.xc-section__lead{margin-top:16px;max-width:38em;font-size:16.5px;color:var(--xc-mist)}
.xc-band{height:1px;border:0;margin:0;background:linear-gradient(90deg,transparent,rgba(139,124,246,.7),rgba(53,224,208,.55),transparent)}

.xc-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:13px 24px;border-radius:var(--xc-r-pill);
  font-size:15px;font-weight:700;
  border:1px solid transparent;cursor:pointer;
  transition:transform .18s ease,background .2s ease,border-color .2s ease,box-shadow .2s ease,color .2s ease;
}
.xc-btn--primary{
  background:linear-gradient(135deg,var(--xc-nebula),var(--xc-aurora));
  color:#fff;
  box-shadow:0 16px 34px -18px rgba(75,79,224,.95);
}
.xc-btn--primary:hover{transform:translateY(-2px);box-shadow:0 22px 40px -18px rgba(139,124,246,.95)}
.xc-btn--ghost{background:rgba(233,238,255,.05);border-color:var(--xc-line-strong);color:var(--xc-star)}
.xc-btn--ghost:hover{border-color:var(--xc-data);color:var(--xc-data)}
.xc-btn--gold{background:var(--xc-gold);color:var(--xc-ink)}
.xc-btn--gold:hover{transform:translateY(-2px)}

.xc-breadcrumb{padding-top:18px}
.xc-breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--xc-font-mono);font-size:12px;letter-spacing:.08em;color:var(--xc-mist)}
.xc-breadcrumb__item{display:flex;align-items:center;gap:8px}
.xc-breadcrumb__item:not(:last-child)::after{content:"/";opacity:.45}
.xc-breadcrumb__link{border-bottom:1px solid transparent;transition:color .18s ease,border-color .18s ease}
.xc-breadcrumb__link:hover{color:var(--xc-data);border-bottom-color:rgba(53,224,208,.5)}
.xc-breadcrumb__current{color:var(--xc-star)}

.xc-prose{max-width:38em;font-size:16.5px;line-height:1.95;color:rgba(233,238,255,.9)}
.xc-prose p{margin-bottom:1.1em}
.xc-prose h2{margin:1.6em 0 .6em;font-size:clamp(24px,3vw,32px);color:var(--xc-star)}
.xc-prose h3{margin:1.4em 0 .5em;font-size:20px;color:var(--xc-star)}
.xc-prose ul{display:grid;gap:8px;margin-bottom:1.2em}
.xc-prose ul li{position:relative;padding-left:16px}
.xc-prose ul li::before{content:"";position:absolute;left:0;top:.78em;width:6px;height:6px;border-radius:50%;background:var(--xc-data)}
.xc-prose a{color:var(--xc-aurora);border-bottom:1px solid rgba(139,124,246,.5)}
.xc-prose a:hover{color:var(--xc-data);border-bottom-color:var(--xc-data)}
.xc-prose strong{color:var(--xc-gold);font-weight:700}

.xc-grid{display:grid;gap:clamp(16px,2.4vw,26px)}
.xc-grid--2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.xc-grid--3{grid-template-columns:repeat(auto-fit,minmax(232px,1fr))}
.xc-grid--4{grid-template-columns:repeat(auto-fit,minmax(178px,1fr))}

.xc-card{
  position:relative;
  padding:clamp(20px,2.4vw,28px);
  border-radius:var(--xc-r-md);
  background:linear-gradient(160deg,rgba(43,47,122,.44),rgba(23,26,74,.26));
  border:1px solid var(--xc-line);
  transition:border-color .2s ease,transform .2s ease,background .2s ease;
}
.xc-card:hover{border-color:rgba(139,124,246,.6);transform:translateY(-3px)}
.xc-card__title{font-size:20px;font-weight:800;letter-spacing:-.01em;color:var(--xc-star)}
.xc-card__text{margin-top:10px;font-size:14.5px;line-height:1.85;color:var(--xc-mist)}
.xc-card--paper{
  background:var(--xc-paper);color:var(--xc-ink);
  border:1.5px solid var(--xc-ink);
  border-radius:6px;
  box-shadow:8px 8px 0 rgba(20,21,47,.38);
}
.xc-card--paper:hover{transform:translateY(-2px);border-color:var(--xc-ink)}
.xc-card--paper .xc-card__title{color:var(--xc-ink)}
.xc-card--paper .xc-card__text{color:rgba(20,21,47,.78)}

.xc-tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 12px;border-radius:var(--xc-r-pill);
  font-family:var(--xc-font-mono);font-size:11px;letter-spacing:.16em;
  background:rgba(53,224,208,.12);
  border:1px solid rgba(53,224,208,.38);
  color:var(--xc-data);
  transition:transform .18s ease;
}
.xc-tag:hover{transform:translateY(-2px)}
.xc-tag--gold{background:rgba(245,185,59,.14);border-color:rgba(245,185,59,.42);color:var(--xc-gold)}
.xc-tag--coral{background:rgba(255,111,139,.14);border-color:rgba(255,111,139,.42);color:var(--xc-coral)}

.xc-datalist{display:grid;font-family:var(--xc-font-mono);font-size:14px;font-variant-numeric:tabular-nums}
.xc-datarow{display:flex;align-items:baseline;gap:14px;padding:11px 4px;border-bottom:1px solid var(--xc-line)}
.xc-datarow__key{flex:0 0 auto;min-width:6.5em;font-size:12.5px;letter-spacing:.08em;color:var(--xc-mist)}
.xc-datarow__val{margin-left:auto;font-weight:600;color:var(--xc-star)}
.xc-datarow__val--gold{color:var(--xc-gold)}
.xc-datarow__val--data{color:var(--xc-data)}

.xc-stat{display:block}
.xc-stat__value{
  display:block;line-height:1;
  font-family:var(--xc-font-mono);
  font-size:clamp(28px,4vw,44px);font-weight:700;
  font-variant-numeric:tabular-nums;
  color:var(--xc-star);
}
.xc-stat__value--gold{color:var(--xc-gold)}
.xc-stat__label{margin-top:10px;font-size:12.5px;letter-spacing:.14em;color:var(--xc-mist)}

.xc-note{
  writing-mode:vertical-rl;
  font-size:11px;letter-spacing:.18em;
  color:var(--xc-mist);
}
.xc-note--gold{color:var(--xc-gold)}

.xc-media{
  position:relative;display:block;overflow:hidden;
  border-radius:var(--xc-r-md);
  border:1px solid var(--xc-line);
  background:linear-gradient(150deg,var(--xc-orbit),var(--xc-cabin) 58%,var(--xc-deep));
}
.xc-media img{width:100%;height:100%;object-fit:cover}
.xc-media--16x9{aspect-ratio:16/9}
.xc-media--4x3{aspect-ratio:4/3}
.xc-media--square{aspect-ratio:1/1}
.xc-media--portrait{aspect-ratio:3/4}
.xc-media--wide{aspect-ratio:21/9}
.xc-media__caption{
  position:absolute;left:12px;bottom:12px;
  padding:4px 11px;border-radius:var(--xc-r-pill);
  background:rgba(10,11,46,.8);
  border:1px solid var(--xc-line-strong);
  font-family:var(--xc-font-mono);font-size:11px;letter-spacing:.14em;color:var(--xc-star);
}

.xc-tabs{display:block}
.xc-tabs__list{
  display:flex;flex-wrap:nowrap;gap:6px;
  width:fit-content;max-width:100%;
  padding:6px;border-radius:var(--xc-r-pill);
  background:rgba(10,11,46,.62);
  border:1px solid var(--xc-line);
  overflow-x:auto;scrollbar-width:none;
}
.xc-tabs__list::-webkit-scrollbar{display:none}
.xc-tabs__tab{
  padding:10px 18px;border-radius:var(--xc-r-pill);
  border:1px solid transparent;cursor:pointer;
  font-size:14px;font-weight:600;white-space:nowrap;
  color:var(--xc-mist);
  transition:color .2s ease,background .2s ease,box-shadow .2s ease;
}
.xc-tabs__tab:hover{color:var(--xc-star);background:rgba(139,124,246,.16)}
.xc-tabs__tab[aria-selected="true"]{
  color:#fff;
  background:linear-gradient(135deg,var(--xc-nebula),var(--xc-aurora));
  box-shadow:0 12px 26px -16px rgba(75,79,224,.95);
}
.xc-tabs__panels{margin-top:22px}
.xc-tabs__panel{animation:xc-fade .18s ease}
.xc-tabs__panel[hidden]{display:none}

@keyframes xc-breathe{
  0%,100%{opacity:1;filter:brightness(1)}
  50%{opacity:.82;filter:brightness(1.12)}
}
@keyframes xc-fade{
  from{opacity:0;transform:translateY(5px)}
  to{opacity:1;transform:none}
}

/* ============ 9. 焦点与动效偏好 ============ */
:focus-visible{outline:2px solid var(--xc-data);outline-offset:3px}
.xc-btn:focus-visible,.xc-nav__link:focus-visible,.xc-pager__btn:focus-visible{outline-offset:4px}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
}

/* ============ 10. 响应式 ============ */
@media (max-width:1080px){
  .xc-nav__link{padding:9px 12px;font-size:14px}
  .xc-pager__count{min-width:52px;font-size:11.5px}
}

@media (max-width:980px){
  .xc-burger{display:inline-flex}
  .xc-nav{
    position:absolute;
    top:calc(100% + 10px);left:0;right:0;
    margin:0;
    padding:12px;
    border-radius:var(--xc-r-lg);
    background:linear-gradient(180deg,rgba(23,26,74,.98),rgba(10,11,46,.99));
    border:1px solid var(--xc-line-strong);
    box-shadow:0 34px 64px -32px rgba(0,0,0,.95);
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .2s ease,transform .2s ease,visibility .2s;
  }
  .xc-nav[data-open]{opacity:1;visibility:visible;transform:translateY(0)}
  .xc-nav__list{flex-direction:column;align-items:stretch;gap:2px}
  .xc-nav__link{padding:13px 16px;border-radius:14px;font-size:16px;opacity:1}
  .xc-nav__link[aria-current="page"]::after{top:50%;right:18px;transform:translateY(-50%)}
  .xc-utility{margin-left:auto}
}

@media (max-width:720px){
  .xc-footer__top{align-items:flex-start}
  .xc-footer__cta{width:100%}
  .xc-footer__cta .xc-btn{flex:1 1 180px}
}

@media (max-width:640px){
  :root{--xc-head-h:92px;--xc-rule-h:44px}
  .xc-header{padding:12px 10px 0}
  .xc-header__inner{padding:8px 8px 8px 14px;gap:10px}
  .xc-header__note{display:none}
  .xc-brand__sub{display:none}
  .xc-pager__count{display:none}
  .xc-pager{padding:3px}
  .xc-burger{padding:8px 12px}
  .xc-burger__label{display:none}
  .xc-footer__wordmark{font-size:clamp(34px,12vw,54px)}
  .xc-footer__cols{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}
  .xc-footer__copy{margin-left:0;width:100%}
  .xc-tabs__list{width:100%}
}

@media (max-width:400px){
  .xc-footer__cols{grid-template-columns:1fr}
  .xc-btn{padding:12px 18px;font-size:14px}
}