/* ===== 开体育主站 · 共享样式 /assets/site.css ===== */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,figcaption,blockquote,dl,dd{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;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}

/* ---------- 设计令牌 ---------- */
:root{
  --ink-900:#05122A;
  --ink-800:#0C2140;
  --ink-700:#1B3A63;
  --mist:#F4F7F4;
  --mist-2:#E3EAE6;
  --green:#17A06A;
  --green-deep:#0E7A50;
  --orange:#FF6B2C;
  --cyan:#35E0D6;
  --lime:#8FA3B8;
  --sand:#FFF6EC;
  --line:rgba(27,58,99,.85);
  --line-soft:rgba(143,163,184,.3);
  --rail-w:88px;
  --shell-max:1240px;
  --gutter:clamp(16px,4vw,40px);
  --r-xl:32px;
  --r-lg:22px;
  --r-md:14px;
  --r-pill:999px;
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:220ms;
  --shadow-lift:0 18px 40px rgba(2,8,20,.45);
}

/* ---------- 基座 ---------- */
body{
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--mist);
  background-color:var(--ink-900);
  background-image:
    radial-gradient(1100px 600px at 84% -4%, rgba(23,160,106,.20), transparent 62%),
    radial-gradient(820px 520px at 2% 16%, rgba(255,107,44,.10), transparent 60%),
    radial-gradient(760px 520px at 62% 118%, rgba(53,224,214,.08), transparent 66%);
  background-repeat:no-repeat;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
#main-content{display:block;scroll-margin-top:150px}
#main-content:focus{outline:none}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;left:14px;top:14px;z-index:200;
  transform:translateY(-180%);
  padding:10px 20px;border-radius:var(--r-pill);
  background:var(--cyan);color:#04202A;font-weight:800;font-size:14px;letter-spacing:.06em;
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0);outline:2px solid var(--mist);outline-offset:2px}

/* ---------- 排版工具 ---------- */
.t-display{font-size:clamp(34px,6vw,76px);line-height:1.06;font-weight:900;letter-spacing:-.02em}
.t-title{font-size:clamp(26px,3.4vw,40px);line-height:1.16;font-weight:900;letter-spacing:-.015em}
.t-sub{font-size:clamp(18px,2vw,22px);font-weight:700;line-height:1.42}
.t-label{font-size:12.5px;letter-spacing:.12em;line-height:1.5;color:var(--lime);font-weight:500}
.t-num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1;letter-spacing:-.01em}
.prose{font-size:clamp(16px,1.05vw,17.5px);line-height:1.78;color:#D3DFEA;max-width:36em}
.prose p + p{margin-top:1em}
.prose strong{color:var(--mist);font-weight:700}
.rule{height:1px;border:0;background:var(--line);margin-block:clamp(20px,3vw,36px)}

/* ---------- 布局 ---------- */
.shell{width:100%;max-width:var(--shell-max);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(36px,5.5vw,72px)}
.section__head{display:flex;flex-wrap:wrap;align-items:flex-end;gap:10px 22px;margin-bottom:clamp(18px,2.4vw,32px)}
.section__kicker{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.14em;color:var(--green)}
.section__title{font-size:clamp(24px,3vw,38px);font-weight:900;line-height:1.16;letter-spacing:-.015em}
.section__note{color:var(--lime);font-size:14px;max-width:46ch}
.grid{display:grid;gap:clamp(14px,2vw,22px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.grid--4{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}
.grid--split{grid-template-columns:1fr}
@media (min-width:900px){.grid--split{grid-template-columns:7fr 5fr}}

/* ---------- 面板与浅色区 ---------- */
.panel{background:var(--ink-800);border:1px solid var(--line);border-radius:var(--r-lg);padding:clamp(16px,2.2vw,26px)}
.panel__head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.panel--flush{padding:0;overflow:hidden}
.surface-light{background:var(--mist);color:#08192F;border-radius:var(--r-xl);padding:clamp(20px,3vw,40px)}
.surface-light .t-label,.surface-light .section__note{color:#3E5A78}
.surface-light .prose{color:#1E3A5A}

/* ---------- 胶囊标签 ---------- */
.pill-row{display:flex;gap:10px;overflow-x:auto;padding:4px 2px;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.pill-row::-webkit-scrollbar{display:none}
.pill{
  flex:none;display:inline-flex;align-items:center;gap:8px;
  padding:8px 16px;border-radius:var(--r-pill);
  border:1px solid var(--line-soft);color:#B9C9DA;font-size:13px;letter-spacing:.06em;white-space:nowrap;
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.pill:hover{color:var(--mist);border-color:var(--green);transform:scale(1.04)}
.pill.is-active,.pill[aria-pressed="true"]{background:linear-gradient(135deg,var(--green),var(--green-deep));border-color:transparent;color:#EFFFF7;font-weight:700}
.pill--orange{border-color:rgba(255,107,44,.5);color:#FFC7AC}
.pill--orange.is-active,.pill--orange[aria-pressed="true"]{background:linear-gradient(135deg,var(--orange),#E24E0F);color:#2A0C00}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 22px;border-radius:var(--r-pill);
  font-size:14.5px;font-weight:700;letter-spacing:.04em;border:1px solid transparent;
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.btn--primary{background:linear-gradient(135deg,var(--green),var(--green-deep));color:#EFFFF7;box-shadow:0 12px 26px rgba(23,160,106,.28)}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 16px 34px rgba(23,160,106,.38)}
.btn--orange{background:linear-gradient(135deg,var(--orange),#E24E0F);color:#2A0C00;box-shadow:0 12px 26px rgba(255,107,44,.26)}
.btn--orange:hover{transform:translateY(-2px);box-shadow:0 16px 34px rgba(255,107,44,.36)}
.btn--ghost{background:transparent;border-color:var(--line-soft);color:#CFDCE8}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--block{width:100%}

/* ---------- 面包屑 ---------- */
.crumb{padding-block:14px}
.crumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--lime)}
.crumb__item{display:inline-flex;align-items:center;gap:8px}
.crumb__link{color:#B9C9DA;border-bottom:1px solid transparent;transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease)}
.crumb__link:hover{color:var(--mist);border-bottom-color:var(--green)}
.crumb__sep{color:var(--ink-700)}
.crumb__current{color:var(--mist);font-weight:700}

/* ---------- 标签与数据 ---------- */
.tag{display:inline-flex;align-items:center;gap:6px;padding:4px 11px;border-radius:var(--r-pill);font-size:12px;letter-spacing:.08em;background:rgba(23,160,106,.16);color:#7FE3B8;border:1px solid rgba(23,160,106,.38)}
.tag--orange{background:rgba(255,107,44,.16);color:#FFC7AC;border-color:rgba(255,107,44,.4)}
.tag--live{background:rgba(53,224,214,.14);color:var(--cyan);border-color:rgba(53,224,214,.4)}
.kpi{display:flex;flex-direction:column;gap:6px;padding:16px 18px;border-radius:var(--r-lg);background:linear-gradient(150deg,rgba(12,33,64,.96),rgba(5,18,42,.85));border:1px solid var(--line)}
.kpi__value{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:clamp(26px,3vw,40px);font-weight:700;line-height:1.05;color:var(--orange)}
.kpi__label{font-size:12.5px;letter-spacing:.1em;color:var(--lime)}
.table{width:100%;font-size:14.5px}
.table th,.table td{padding:11px 12px;text-align:left;border-bottom:1px solid var(--line)}
.table thead th{font-size:12px;letter-spacing:.12em;color:var(--lime);font-weight:600}
.table tbody tr:nth-child(even){background:rgba(12,33,64,.45)}
.table tbody tr:hover{background:rgba(23,160,106,.14)}
.table th.num,.table td.num{text-align:right;font-family:var(--font-mono);font-variant-numeric:tabular-nums}

/* ---------- 图片容器（页面阶段放占位图） ---------- */
.media{
  position:relative;width:100%;overflow:hidden;border-radius:var(--r-lg);
  background:linear-gradient(135deg,#0C2140 0%,#123055 52%,#0E7A50 100%);
  border:1px solid var(--line);isolation:isolate;
}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(115deg, rgba(53,224,214,.07) 0 2px, transparent 2px 22px);
}
.media__img{position:relative;z-index:1;width:100%;height:100%;object-fit:cover;display:block}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--21x9{aspect-ratio:21/9}
.media__badge{
  position:absolute;left:12px;bottom:12px;z-index:2;
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 12px;border-radius:var(--r-pill);
  background:rgba(5,18,42,.84);border:1px solid rgba(53,224,214,.35);
  font-family:var(--font-mono);font-size:12px;color:var(--mist);
}
@media (max-width:600px){.media{border-radius:var(--r-md)}}

/* ---------- 显现动效 ---------- */
.js-enabled .reveal{
  opacity:0;transform:translateY(14px);
  transition:opacity 520ms var(--ease),transform 520ms var(--ease);
  transition-delay:var(--d,0ms);
}
.js-enabled .reveal.is-in{opacity:1;transform:none}

/* ---------- 侧轨 ---------- */
.side-rail{display:none}
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  .skip-link{left:calc(var(--rail-w) + 18px)}
  .side-rail{
    display:flex;position:fixed;left:0;top:0;bottom:0;width:var(--rail-w);z-index:90;
    flex-direction:column;align-items:center;gap:18px;
    padding:20px 0 26px;
    background:linear-gradient(180deg,#04101F 0%,#05122A 46%,#071A33 100%);
    border-right:1px solid var(--line);
  }
}
.side-rail__mark{
  flex:none;width:46px;height:46px;border-radius:16px;display:grid;place-items:center;
  background:linear-gradient(145deg,var(--green),var(--green-deep));
  color:#EFFFF7;font-weight:900;font-size:20px;line-height:1;
  box-shadow:0 10px 26px rgba(23,160,106,.35);
  transition:transform var(--dur) var(--ease);
}
.side-rail__mark:hover{transform:translateY(-2px)}
.side-rail__pin{
  flex:none;width:8px;height:8px;border-radius:50%;background:var(--cyan);
  box-shadow:0 0 0 6px rgba(53,224,214,.14);
  animation:railPulse 2.6s var(--ease) infinite;
}
.side-rail__thread{position:relative;flex:1 1 auto;width:3px;border-radius:999px;background:rgba(27,58,99,.95);overflow:hidden;margin:4px 0;min-height:80px}
.side-rail__thread-fill{
  position:absolute;left:0;right:0;top:0;height:0%;
  border-radius:999px;
  background:linear-gradient(180deg,var(--cyan),var(--green) 55%,var(--orange));
  transition:height 140ms linear;
}
.side-rail__label{
  flex:none;writing-mode:vertical-rl;text-orientation:mixed;
  font-size:12px;line-height:1;letter-spacing:.34em;color:var(--lime);
}
@keyframes railPulse{
  0%,100%{box-shadow:0 0 0 4px rgba(53,224,214,.16);opacity:1}
  50%{box-shadow:0 0 0 9px rgba(53,224,214,.04);opacity:.72}
}

/* ---------- 页头 ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(5,18,42,.9);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.brand-strip{
  max-height:150px;overflow:hidden;
  background:linear-gradient(90deg,rgba(12,33,64,.96),rgba(5,18,42,.72));
  border-bottom:1px solid rgba(27,58,99,.7);
  transition:max-height 300ms var(--ease),opacity 200ms linear;
}
.brand-strip__inner{
  display:flex;align-items:center;justify-content:flex-end;
  gap:clamp(12px,2.4vw,28px);
  max-width:var(--shell-max);margin-inline:auto;
  padding:14px var(--gutter);
  transition:padding 300ms var(--ease);
}
.site-header.is-compact .brand-strip{max-height:0;opacity:0}
.site-header.is-compact .brand-strip__inner{padding-top:0;padding-bottom:0}

.brand-mark{display:flex;align-items:center;gap:12px;min-width:0;margin-right:auto}
.brand-mark__glyph{
  flex:none;width:38px;height:38px;border-radius:12px;display:grid;place-items:center;
  background:linear-gradient(140deg,var(--green),var(--green-deep));
  color:#EFFFF7;font-weight:900;font-size:18px;line-height:1;
}
.brand-mark__text{display:flex;flex-direction:column;min-width:0}
.brand-mark__name{font-size:clamp(17px,2.2vw,20px);font-weight:900;letter-spacing:-.01em;line-height:1.2;color:var(--mist)}
.brand-mark__tag{
  font-size:12px;line-height:1.45;letter-spacing:.14em;color:var(--lime);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.rhythm{
  flex:none;display:none;align-items:center;gap:10px;
  padding:8px 16px;border-radius:var(--r-pill);
  background:rgba(12,33,64,.92);border:1px solid rgba(53,224,214,.28);
  font-family:var(--font-mono);font-size:12.5px;color:#CFE9E4;white-space:nowrap;
}
.rhythm__dot{flex:none;width:8px;height:8px;border-radius:50%;background:var(--cyan);animation:railPulse 2.6s var(--ease) infinite}
.rhythm__text{line-height:1.4}
.brand-strip__tools{flex:none;display:flex;align-items:center;gap:10px}
.tool-btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;border-radius:var(--r-pill);
  border:1px solid var(--line-soft);color:#C8D6E4;
  font-size:12.5px;letter-spacing:.06em;white-space:nowrap;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.tool-btn:hover{border-color:var(--cyan);color:var(--cyan)}
.tool-btn[aria-pressed="true"]{background:rgba(53,224,214,.14);border-color:var(--cyan);color:var(--cyan)}

.nav-strip{background:rgba(5,18,42,.6)}
.nav-strip__inner{
  position:relative;display:flex;align-items:center;gap:12px;
  max-width:var(--shell-max);margin-inline:auto;
  padding:0 var(--gutter);min-height:60px;
  transition:min-height 200ms var(--ease);
}
.site-header.is-compact .nav-strip__inner{min-height:50px}

.nav-burger{
  display:inline-flex;align-items:center;gap:10px;flex:none;
  padding:9px 16px;border-radius:var(--r-pill);
  border:1px solid var(--line-soft);color:var(--mist);
  font-size:13px;letter-spacing:.1em;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-burger__bars{display:grid;gap:4px;width:18px}
.nav-burger__bars i{display:block;height:2px;border-radius:2px;background:currentColor;transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease)}
.nav-burger__label{line-height:1}
.nav-burger[aria-expanded="true"]{border-color:var(--cyan);color:var(--cyan);background:rgba(53,224,214,.1)}
.nav-burger[aria-expanded="true"] .nav-burger__bars i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-burger[aria-expanded="true"] .nav-burger__bars i:nth-child(2){opacity:0}
.nav-burger[aria-expanded="true"] .nav-burger__bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.site-nav__link{
  display:block;padding:9px 16px;border-radius:var(--r-pill);
  font-size:14px;letter-spacing:.04em;color:#B9C9DA;white-space:nowrap;
  border:1px solid transparent;
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.site-nav__link:hover{color:var(--mist);background:rgba(23,160,106,.16);border-color:rgba(23,160,106,.5)}
.site-nav__link[aria-current="page"]{
  color:#04241A;font-weight:700;
  background:linear-gradient(135deg,var(--green),#0FA063);
  border-color:transparent;
  box-shadow:0 8px 20px rgba(23,160,106,.3);
}
.nav-strip__cta{
  margin-left:auto;flex:none;display:inline-flex;align-items:center;gap:8px;
  padding:10px 18px;border-radius:var(--r-pill);
  background:linear-gradient(135deg,var(--orange),#E24E0F);
  color:#2A0C00;font-size:13.5px;font-weight:800;letter-spacing:.06em;white-space:nowrap;
  box-shadow:0 10px 24px rgba(255,107,44,.28);
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.nav-strip__cta:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(255,107,44,.38)}

@media (min-width:860px){
  .nav-burger{display:none}
  .site-nav{flex:1 1 auto;min-width:0;display:flex}
  .site-nav__list{display:flex;align-items:center;gap:4px;padding:4px 0;overflow-x:auto;scrollbar-width:none}
  .site-nav__list::-webkit-scrollbar{display:none}
  .site-nav__item{flex:none}
}
@media (max-width:859px){
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    background:linear-gradient(180deg,#0A1C36,#08152C);
    border-top:1px solid var(--line);border-bottom:1px solid var(--line);
    padding:8px var(--gutter) 16px;
    max-height:0;overflow:hidden;opacity:0;visibility:hidden;
    transition:max-height 340ms var(--ease),opacity 180ms linear,visibility 0s linear 340ms;
  }
  .site-nav[data-open]{
    max-height:min(74vh,560px);overflow-y:auto;opacity:1;visibility:visible;
    transition:max-height 340ms var(--ease),opacity 180ms linear,visibility 0s;
  }
  .site-nav__item + .site-nav__item{border-top:1px solid rgba(27,58,99,.55)}
  .site-nav__link{padding:14px 12px;border-radius:var(--r-md);font-size:16px;color:#CFDCE8}
  .site-nav__link[aria-current="page"]{border-radius:var(--r-md)}
}
@media (min-width:600px) and (max-width:859px){
  .rhythm{display:inline-flex}
}
@media (min-width:860px){
  .rhythm{display:inline-flex}
}
@media (max-width:520px){
  .brand-mark__tag{display:none}
  .nav-strip__cta{padding:9px 14px;font-size:12.5px}
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(48px,7vw,96px);
  background:linear-gradient(180deg,#061530 0%,#04101F 62%,#030C18 100%);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";position:absolute;left:-10%;right:-10%;bottom:-160px;height:320px;pointer-events:none;
  background:radial-gradient(60% 100% at 50% 100%, rgba(23,160,106,.22), transparent 72%);
}
.footer-grid{
  position:relative;z-index:1;
  display:grid;gap:clamp(24px,3.4vw,44px);
  grid-template-columns:1fr;
  max-width:var(--shell-max);margin-inline:auto;
  padding:clamp(36px,5vw,64px) var(--gutter) clamp(20px,3vw,32px);
}
@media (min-width:720px){.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:1024px){.footer-grid{grid-template-columns:1.5fr repeat(3,minmax(0,1fr))}}
.footer-brand{display:flex;flex-direction:column;gap:14px;min-width:0}
.footer-brand__line{font-size:14px;line-height:1.7;color:var(--lime);max-width:34ch}
.footer-col{min-width:0}
.footer-col__title{
  display:flex;align-items:center;gap:8px;
  margin-bottom:12px;
  font-size:12px;font-weight:600;letter-spacing:.2em;color:var(--lime);
}
.footer-col__title::before{content:"";width:16px;height:2px;border-radius:2px;background:var(--green)}
.footer-col__list{display:flex;flex-direction:column}
.footer-col__link{
  display:inline-block;padding:6px 0;
  font-size:14.5px;color:#B9C9DA;
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-col__link:hover{color:var(--mist);border-bottom-color:var(--green)}

.footer-contact{
  position:relative;z-index:1;
  display:grid;gap:16px;grid-template-columns:1fr;
  max-width:var(--shell-max);margin-inline:auto;
  padding:24px var(--gutter) 0;
  border-top:1px solid rgba(27,58,99,.6);
}
@media (min-width:760px){.footer-contact{grid-template-columns:repeat(3,minmax(0,1fr))}}
.footer-contact__item{min-width:0;padding-left:14px;border-left:2px solid rgba(23,160,106,.55)}
.footer-contact__label{display:block;margin-bottom:4px;font-size:12px;letter-spacing:.16em;color:var(--lime)}
.footer-contact__value{display:block;font-family:var(--font-mono);font-size:14.5px;color:var(--mist);word-break:break-all}

.footer-note{
  position:relative;z-index:1;
  max-width:var(--shell-max);margin:24px auto 0;
  padding-inline:var(--gutter);
  font-size:13.5px;line-height:1.75;color:var(--lime);
}
.footer-legal{
  position:relative;z-index:1;
  display:flex;flex-wrap:wrap;align-items:center;gap:12px 22px;
  max-width:var(--shell-max);
  margin:22px auto 0;padding:18px var(--gutter) 30px;
  border-top:1px solid rgba(27,58,99,.6);
  font-size:13px;color:var(--lime);
}
.footer-legal__icp{font-family:var(--font-mono);letter-spacing:.04em}
.footer-legal__year{font-family:var(--font-mono)}
.to-top{
  margin-left:auto;display:inline-flex;align-items:center;gap:8px;
  padding:9px 16px;border-radius:var(--r-pill);
  border:1px solid var(--line-soft);color:#C8D6E4;
  font-size:12.5px;letter-spacing:.1em;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.to-top:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-2px)}

/* ---------- 减少动效 ---------- */
.reduce-motion *,
.reduce-motion *::before,
.reduce-motion *::after{
  animation:none !important;
  transition:none !important;
  scroll-behavior:auto !important;
}
.reduce-motion .reveal,
.reduce-motion .js-enabled .reveal{opacity:1 !important;transform:none !important}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js-enabled .reveal{opacity:1;transform:none;transition:none}
}