/* ==========================================================================
   欢云赛场 · /assets/site.css
   共享外壳：reset / tokens / 中文排版 / 页头 / 页脚 / 基础组件
   ========================================================================== */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{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%}

/* ---------- tokens ---------- */
:root{
  --sky:#0B3A7A;
  --indigo:#191146;
  --teal:#063F3C;
  --wine:#6B1533;
  --cloud:#F5F8FF;
  --cyan:#00E7C1;
  --orange:#FF7A2F;
  --ink:#0B1220;
  --slate:#5C6B8A;
  --mist:#DCE6F7;
  --focus:var(--orange);
  --font-sans:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --shell:1360px;
  --pad:clamp(20px,3.2vw,46px);
  --header-h:78px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- base ---------- */
body{
  font-family:var(--font-sans);
  font-size:16.5px;
  line-height:1.75;
  font-weight:400;
  color:var(--ink);
  background:var(--cloud);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-weight:300;line-height:1.2;letter-spacing:.005em}
strong{font-weight:700}
::selection{background:var(--cyan);color:var(--ink)}
:focus-visible{outline:2px solid var(--focus);outline-offset:3px}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;top:10px;left:12px;z-index:200;
  transform:translateY(-180%);
  background:var(--orange);color:var(--ink);
  font:600 13px/1 var(--font-sans);letter-spacing:.08em;
  padding:13px 18px;
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 容器与画板 ---------- */
.shell{width:100%;max-width:var(--shell);margin:0 auto;padding:0 var(--pad)}

.panel{
  --fg:var(--ink);
  --muted:var(--slate);
  --accent-line:var(--mist);
  --stat-color:var(--sky);
  position:relative;
  background:var(--cloud);
  color:var(--fg);
  padding:clamp(48px,6vw,96px) 0;
  border-top:1px solid var(--mist);
}
.panel--sky{--fg:var(--cloud);--muted:rgba(220,230,247,.68);--accent-line:rgba(220,230,247,.22);--stat-color:var(--cyan);background:var(--sky);border-top-color:rgba(220,230,247,.18)}
.panel--indigo{--fg:var(--cloud);--muted:rgba(220,230,247,.64);--accent-line:rgba(220,230,247,.2);--stat-color:var(--cyan);background:var(--indigo);border-top-color:rgba(220,230,247,.16)}
.panel--teal{--fg:var(--cloud);--muted:rgba(220,230,247,.66);--accent-line:rgba(0,231,193,.28);--stat-color:var(--cyan);background:var(--teal);border-top-color:rgba(0,231,193,.24)}
.panel--wine{--fg:var(--cloud);--muted:rgba(245,232,238,.7);--accent-line:rgba(255,122,47,.35);--stat-color:var(--orange);background:var(--wine);border-top-color:rgba(255,122,47,.3)}

[data-section]{transition:outline-color .3s var(--ease),box-shadow .3s var(--ease)}
[data-section].is-current{outline:1px solid rgba(0,231,193,.55);outline-offset:-1px}

/* ---------- 文字 ---------- */
.display{
  font-weight:300;
  font-size:clamp(56px,9vw,128px);
  line-height:1.02;
  letter-spacing:-.012em;
}
.section__title{
  font-weight:300;
  font-size:clamp(28px,3.4vw,48px);
  line-height:1.18;
}
.section__head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:14px 28px;margin-bottom:clamp(24px,3vw,44px);
}
.eyebrow{
  font:500 11px/1 var(--font-mono);letter-spacing:.24em;text-transform:uppercase;
  color:var(--muted);
}
.index-tag{
  display:inline-block;
  font:400 11px/1 var(--font-mono);letter-spacing:.16em;
  color:var(--muted);
  padding-bottom:7px;border-bottom:1px solid var(--accent-line);
}
.lede{font-size:clamp(17px,1.5vw,20px);line-height:1.7;color:var(--muted);max-width:60ch}
.prose{max-width:68ch;font-size:17px;line-height:1.75}
.prose p + p{margin-top:1em}
.prose h3{margin:1.6em 0 .5em;font-size:20px;font-weight:600}
.prose ul{margin:.8em 0;display:grid;gap:.4em}
.prose ul li{padding-left:16px;position:relative;color:var(--muted)}
.prose ul li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:1px;background:var(--accent-line)}
.rule{height:1px;border:0;background:var(--accent-line)}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:clamp(20px,2.4vw,40px)}
.grid--7-5{grid-template-columns:7fr 5fr}
.grid--5-7{grid-template-columns:5fr 7fr}
.grid--4-8{grid-template-columns:4fr 8fr}
.grid--3-6-3{grid-template-columns:3fr 6fr 3fr}
.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))}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:15px 24px;
  font:600 13.5px/1 var(--font-sans);letter-spacing:.06em;
  border:1px solid transparent;
  transition:transform .18s var(--ease),background-color .2s,color .2s,border-color .2s;
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:none}
.btn--primary{background:var(--orange);border-color:var(--orange);color:var(--ink)}
.btn--primary:hover{background:#FF9556;border-color:#FF9556}
.btn--ghost{background:transparent;border-color:currentColor;color:inherit}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--quiet{background:transparent;border-color:rgba(92,107,138,.4);color:var(--ink)}
.btn--quiet:hover{border-color:var(--sky);color:var(--sky)}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  font:500 11px/1 var(--font-mono);letter-spacing:.12em;
  padding:7px 11px;border:1px solid var(--accent-line);color:var(--muted);
}
.tag--cyan{border-color:rgba(0,231,193,.55);color:var(--cyan)}
.tag--orange{border-color:var(--orange);color:var(--orange)}
.tag--solid{background:var(--cyan);border-color:var(--cyan);color:var(--ink)}

/* ---------- 面包屑 ---------- */
.breadcrumb{padding:18px 0}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font:400 11px/1 var(--font-mono);letter-spacing:.1em;color:var(--muted)}
.breadcrumb__item{display:inline-flex;align-items:center;gap:10px}
.breadcrumb__link{padding-bottom:3px;border-bottom:1px solid transparent;transition:color .2s,border-color .2s}
.breadcrumb__link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.breadcrumb__sep{color:var(--accent-line)}
.breadcrumb__item[aria-current="page"]{color:var(--fg);font-weight:600}

/* ---------- 侧边锚点索引 ---------- */
.anchors{
  position:sticky;top:calc(var(--header-h) + 26px);align-self:start;
  padding-top:16px;border-top:1px solid var(--accent-line);
}
.anchors__title{font:500 11px/1 var(--font-mono);letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}
.anchors__list{margin-top:14px;display:grid;gap:2px}
.anchors__link{
  display:flex;gap:10px;align-items:baseline;
  padding:9px 0 9px 12px;
  font-size:14px;color:var(--muted);
  border-left:1px solid var(--accent-line);
  transition:color .2s,border-color .2s;
}
.anchors__link:hover{color:var(--fg)}
.anchors__link.is-active{border-left-color:var(--orange);color:var(--fg);font-weight:600}

/* ---------- 图片容器（页面阶段放置占位/图片） ---------- */
.media{
  position:relative;overflow:hidden;
  aspect-ratio:16/9;
  background:linear-gradient(140deg,var(--indigo),var(--sky) 60%,var(--teal));
  border:1px solid var(--accent-line);
}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:4/5}
.media--square{aspect-ratio:1/1}
.media__img{width:100%;height:100%;object-fit:cover}
.media__scan{
  position:absolute;inset:0;pointer-events:none;opacity:.6;
  background-image:linear-gradient(rgba(0,231,193,.16) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(0,231,193,.16) 1px,transparent 1px),
                   linear-gradient(rgba(220,230,247,.07) 1px,transparent 1px);
  background-size:48px 48px,48px 48px,12px 12px;
}
.media__caption{margin-top:10px;font:400 11px/1.6 var(--font-mono);letter-spacing:.06em;color:var(--muted)}

/* ---------- 数据组件 ---------- */
.stat-row{display:flex;flex-wrap:wrap;gap:clamp(18px,3vw,48px)}
.stat{display:grid;gap:7px;min-width:104px}
.stat__value{font:700 clamp(24px,3vw,38px)/1 var(--font-mono);letter-spacing:-.02em;color:var(--stat-color)}
.stat__label{font:400 11px/1.4 var(--font-mono);letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}

.meta-row{display:flex;flex-wrap:wrap;gap:8px 20px;font:400 12px/1.6 var(--font-mono);letter-spacing:.06em;color:var(--muted)}
.meta-row__key{font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
.meta-row__value{color:var(--fg)}

.index-list{display:grid;border-top:1px solid var(--accent-line)}
.index-list__item{
  display:grid;grid-template-columns:62px minmax(0,1fr);gap:18px;align-items:baseline;
  padding:16px 0;border-bottom:1px solid var(--accent-line);
}
.index-list__num{font:400 11px/1.6 var(--font-mono);letter-spacing:.1em;color:var(--muted)}
.index-list__label{font-size:16px;color:var(--fg)}

.float-chip{
  position:absolute;display:inline-flex;align-items:center;gap:8px;
  padding:9px 13px;
  background:rgba(11,18,32,.66);
  border:1px solid rgba(0,231,193,.42);
  color:var(--cyan);
  font:500 11px/1 var(--font-mono);letter-spacing:.1em;
  animation:chip-float 8s var(--ease) infinite;
}
@keyframes chip-float{
  0%,100%{transform:translate3d(0,0,0)}
  50%{transform:translate3d(0,-8px,0)}
}

/* ---------- 显现 ---------- */
.js-ready [data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.js-ready [data-reveal].is-visible{opacity:1;transform:none}

/* ==========================================================================
   页头
   ========================================================================== */
.site-header{
  position:sticky;top:0;z-index:90;
  background:var(--sky);
  color:var(--cloud);
  border-bottom:1px solid rgba(220,230,247,.16);
}
.header-utility{background:rgba(11,18,32,.34);border-bottom:1px solid rgba(220,230,247,.12)}
.header-utility__inner{
  max-width:var(--shell);margin:0 auto;padding:0 var(--pad);
  min-height:34px;display:flex;align-items:center;justify-content:space-between;gap:18px;
}
.header-utility__note{
  font:400 11px/1.4 var(--font-mono);letter-spacing:.16em;text-transform:uppercase;
  color:rgba(220,230,247,.55);
}
.utility-list{display:flex;align-items:center}
.utility-list__item{display:flex;align-items:center}
.utility-list__item + .utility-list__item::before{
  content:"";width:1px;height:12px;background:rgba(220,230,247,.22);margin:0 14px;
}
.utility-link{
  font:500 12px/1 var(--font-sans);letter-spacing:.04em;
  color:rgba(220,230,247,.72);padding:10px 0;
  border-bottom:1px solid transparent;
  transition:color .2s,border-color .2s;
}
.utility-link:hover,.utility-link[aria-current="page"]{color:var(--cyan);border-bottom-color:var(--cyan)}

.header-main__inner{
  max-width:var(--shell);margin:0 auto;padding:0 var(--pad);
  min-height:var(--header-h);
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.brand{display:flex;align-items:baseline;gap:13px;padding:10px 0}
.brand__mark{font:300 clamp(20px,2vw,26px)/1 var(--font-sans);letter-spacing:.07em;color:var(--cloud)}
.brand__line{
  font:400 11px/1 var(--font-mono);letter-spacing:.1em;
  color:rgba(0,231,193,.86);
  padding-left:13px;border-left:1px solid rgba(220,230,247,.25);
}

.site-nav{display:flex;align-items:center;gap:clamp(14px,2vw,30px)}
.site-nav__list{display:flex;align-items:center;gap:clamp(10px,1.6vw,26px)}
.site-nav__item{display:flex;align-items:center;padding-left:clamp(10px,1.6vw,26px);border-left:1px solid rgba(220,230,247,.18)}
.site-nav__item:first-child{padding-left:0;border-left:0}
.site-nav__link{
  display:flex;align-items:baseline;gap:7px;
  padding:6px 0;color:rgba(245,248,255,.82);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.site-nav__index{font:400 10px/1 var(--font-mono);letter-spacing:.06em;color:rgba(220,230,247,.42)}
.site-nav__label{font-size:14.5px;letter-spacing:.02em}
.site-nav__link:hover{color:var(--cloud);border-bottom-color:rgba(0,231,193,.6)}
.site-nav__link:hover .site-nav__index{color:var(--cyan)}
.site-nav__link[aria-current="page"]{color:var(--cyan);font-weight:600;border-bottom-color:var(--cyan)}
.site-nav__link[aria-current="page"] .site-nav__index{color:var(--cyan)}

.nav-toggle{display:none;align-items:center;gap:9px;padding:11px 13px;border:1px solid rgba(220,230,247,.3);color:var(--cloud)}
.nav-toggle__bars{display:block;width:18px}
.nav-toggle__bars span{display:block;height:1px;background:currentColor;margin:4px 0;transition:transform .24s var(--ease)}
.nav-toggle__label{font:500 12px/1 var(--font-sans);letter-spacing:.12em}
.site-header[data-open="true"] .nav-toggle{color:var(--cyan);border-color:var(--cyan)}
.site-header[data-open="true"] .nav-toggle__bars span:first-child{transform:translateY(2.5px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bars span:last-child{transform:translateY(-2.5px) rotate(-45deg)}

.header-meter{
  display:none;align-items:center;gap:16px;
  max-width:var(--shell);margin:0 auto;padding:0 var(--pad) 10px;
  font:400 11px/1 var(--font-mono);letter-spacing:.08em;color:rgba(220,230,247,.6);
}
.site-header[data-scrolled="true"] .header-meter{display:flex}
.header-meter__section{display:flex;align-items:center;gap:9px;min-width:126px}
.header-meter__num{color:var(--cyan)}
.header-meter__name{font-family:var(--font-sans);letter-spacing:.04em;color:rgba(245,248,255,.82)}
.header-meter__track{flex:1;height:1px;background:rgba(220,230,247,.22);position:relative;overflow:hidden}
.header-meter__fill{position:absolute;inset:0;background:var(--cyan);transform:scaleX(0);transform-origin:left}
.header-meter__pct{min-width:40px;text-align:right;color:rgba(245,248,255,.86)}

.site-header[data-scrolled="true"]{box-shadow:0 10px 30px rgba(6,18,40,.35)}
.site-header[data-scrolled="true"] .header-utility{display:none}
.site-header[data-scrolled="true"] .header-main__inner{min-height:56px}
.site-header[data-scrolled="true"] .brand__line{display:none}
.site-header[data-scrolled="true"] .brand__mark{font-size:20px}

.scroll-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(0,231,193,.14);overflow:hidden;pointer-events:none}
.scroll-progress__fill{display:block;height:100%;width:100%;background:var(--cyan);transform:scaleX(0);transform-origin:left}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer{
  position:relative;overflow:hidden;
  background:var(--sky);color:var(--cloud);
  border-top:1px solid rgba(220,230,247,.18);
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(220,230,247,.05) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(220,230,247,.05) 1px,transparent 1px);
  background-size:64px 64px;
}
.site-footer__inner{
  position:relative;
  max-width:var(--shell);margin:0 auto;padding:clamp(38px,5vw,68px) var(--pad) 30px;
  display:grid;grid-template-columns:minmax(230px,4fr) 8fr;gap:clamp(26px,4vw,60px);
}
.site-footer__mark{font:300 clamp(24px,2.6vw,34px)/1.1 var(--font-sans);letter-spacing:.06em;color:var(--cloud)}
.site-footer__line{margin-top:11px;font:400 12px/1.6 var(--font-mono);letter-spacing:.08em;color:rgba(0,231,193,.86)}
.site-footer__scale{
  margin-top:20px;height:9px;
  border-left:1px solid rgba(220,230,247,.4);border-right:1px solid rgba(220,230,247,.4);
  background:repeating-linear-gradient(90deg,rgba(220,230,247,.36) 0 1px,transparent 1px 14px);
}
.site-footer__nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,3vw,40px)}
.footer-col__title{
  font:500 11px/1 var(--font-mono);letter-spacing:.22em;text-transform:uppercase;
  color:rgba(220,230,247,.5);
  padding-bottom:13px;border-bottom:1px solid rgba(220,230,247,.16);
}
.footer-col__list{margin-top:15px;display:grid;gap:10px}
.footer-link{
  font-size:14px;color:rgba(245,248,255,.8);
  padding-bottom:2px;border-bottom:1px solid transparent;
  transition:color .2s,border-color .2s;
}
.footer-link:hover,.footer-link[aria-current="page"]{color:var(--cyan);border-bottom-color:var(--cyan)}

.site-footer__contact{
  position:relative;
  max-width:var(--shell);margin:0 auto;padding:22px var(--pad);
  display:grid;gap:9px;
  border-top:1px solid rgba(220,230,247,.14);
}
.footer-contact__row{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 14px;font:400 13px/1.7 var(--font-sans)}
.footer-contact__key{font:400 11px/1.7 var(--font-mono);letter-spacing:.14em;color:rgba(0,231,193,.82);min-width:58px}
.footer-contact__value{color:rgba(245,248,255,.86)}

.site-footer__legal{
  position:relative;
  max-width:var(--shell);margin:0 auto;padding:18px var(--pad) 34px;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;
  border-top:1px solid rgba(220,230,247,.14);
  font:400 11.5px/1.6 var(--font-mono);letter-spacing:.05em;color:rgba(220,230,247,.62);
}
.footer-legal__item{margin:0}
.footer-legal__icp{color:rgba(220,230,247,.72)}
.to-top{
  display:inline-flex;align-items:center;gap:9px;
  padding:11px 15px;
  border:1px solid rgba(220,230,247,.32);
  font:500 11px/1 var(--font-mono);letter-spacing:.16em;
  color:rgba(245,248,255,.86);
  transition:border-color .2s,color .2s;
}
.to-top::before{
  content:"";width:8px;height:8px;
  border-left:1px solid currentColor;border-top:1px solid currentColor;
  transform:rotate(45deg);
}
.to-top:hover{border-color:var(--cyan);color:var(--cyan)}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width:1024px){
  .nav-toggle{display:inline-flex}
  .header-utility__note{display:none}
  .site-nav{
    position:absolute;top:100%;left:0;right:0;z-index:95;
    display:flex;flex-direction:column;align-items:stretch;gap:0;
    background:var(--indigo);
    border-top:1px solid rgba(0,231,193,.4);
    border-bottom:1px solid rgba(220,230,247,.16);
    padding:6px var(--pad) 24px;
    max-height:calc(100vh - 110px);overflow-y:auto;
    visibility:hidden;opacity:0;transform:translateY(-10px);pointer-events:none;
    transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s var(--ease);
  }
  .site-header[data-open="true"] .site-nav{visibility:visible;opacity:1;transform:none;pointer-events:auto}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__item{padding-left:0;border-left:0;border-top:1px solid rgba(220,230,247,.12)}
  .site-nav__item:first-child{border-top:0}
  .site-nav__link{justify-content:space-between;align-items:center;padding:17px 2px;color:rgba(245,248,255,.9)}
  .site-nav__index{order:2;font-size:11px;color:rgba(0,231,193,.7)}
  .site-nav__label{font-size:17px}
  .site-nav__link[aria-current="page"]{border-bottom-color:transparent;padding-left:12px;box-shadow:inset 2px 0 0 var(--cyan)}
}
@media (max-width:960px){
  .grid--7-5,.grid--5-7,.grid--4-8,.grid--3-6-3,
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .site-footer__inner{grid-template-columns:minmax(0,1fr)}
  .anchors{position:static;margin-bottom:24px}
}
@media (max-width:720px){
  body{font-size:16px}
  .brand__line{display:none}
  .site-footer__nav{grid-template-columns:minmax(0,1fr);gap:26px}
  .site-footer__legal{flex-direction:column;align-items:flex-start}
  .footer-contact__key{min-width:0;width:100%}
  .index-list__item{grid-template-columns:48px minmax(0,1fr);gap:12px}
}

/* ---------- 动效与对比度偏好 ---------- */
@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-ready [data-reveal]{opacity:1;transform:none}
  .float-chip{animation:none}
}