/* ============================================================
   云开赛场 · 共享样式 /assets/site.css
   深海蓝基底 + 荧光青主路径 + 暖橙行动点 + 信号黄提醒
   ============================================================ */

/* ---------- 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,video,canvas{display:block;max-width:100%}
img,video{height:auto}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:0}
button{cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}
::selection{background:var(--cyan);color:var(--ink)}

/* ---------- tokens ---------- */
:root{
  --deep:#061829;
  --night:#0D2A42;
  --stand:#18405F;
  --cyan:#2BE8C6;
  --cyan-dim:#0F9E8A;
  --orange:#FF8A3D;
  --orange-dim:#C75A1E;
  --mist:#E9F2F9;
  --slate:#93A9BC;
  --line:#1E4462;
  --signal:#F5D547;
  --ink:#04121F;

  --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",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --radius-lg:22px;
  --radius:16px;
  --radius-sm:12px;
  --pill:999px;

  --shadow-soft:0 18px 42px -26px rgba(2,10,20,.95);
  --shadow-float:0 26px 64px -30px rgba(2,10,20,.98);

  --shell:1180px;
  --gutter:clamp(16px,4vw,32px);
  --header-space:108px;
  --nav-break:1080px;
}

/* ---------- page canvas ---------- */
body{
  min-height:100vh;
  padding-top:var(--header-space);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  color:var(--mist);
  background-color:var(--deep);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    radial-gradient(920px 540px at 10% -10%, rgba(43,232,198,.11), transparent 62%),
    radial-gradient(760px 460px at 98% 2%, rgba(255,138,61,.09), transparent 60%),
    repeating-linear-gradient(122deg, rgba(30,68,98,.42) 0 1px, transparent 1px 112px);
}
main,.site-footer,.page-head,.shell{position:relative;z-index:1}
#main-content{display:block;min-height:42vh;scroll-margin-top:calc(var(--header-space) + 8px)}

@media (max-width:640px){
  body{font-size:15px;--header-space:96px}
}

/* ---------- typography ---------- */
h1,h2,h3,h4,h5,h6{
  font-weight:900;
  line-height:1.14;
  letter-spacing:-.02em;
  color:var(--mist);
  text-wrap:balance;
}
h1{font-size:clamp(38px,6.2vw,64px)}
h2{font-size:clamp(26px,3.4vw,48px)}
h3{font-size:clamp(20px,2.2vw,32px)}
h4{font-size:22px;letter-spacing:-.01em}
p{text-wrap:pretty}
.num,.mono,.stat-num,.footer-copy{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.02em;
}
.shell{width:min(var(--shell),100% - var(--gutter));margin-inline:auto}
.lede{font-size:17px;line-height:1.8;color:var(--slate);max-width:62ch}
.note{
  font-size:13.5px;
  line-height:1.8;
  color:var(--slate);
  border-left:2px solid var(--cyan);
  padding-left:14px;
}
.hairline{height:1px;background:var(--line);border:0}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:12px;
  font-weight:700;
  letter-spacing:.16em;
  color:var(--cyan);
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor}
.eyebrow--orange{color:var(--orange)}
.eyebrow--slate{color:var(--slate)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  border:1px solid transparent;
  border-radius:var(--pill);
  font-size:15px;
  font-weight:800;
  letter-spacing:.01em;
  line-height:1.2;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.btn--sm{padding:9px 16px;font-size:14px}
.btn--accent{background:var(--cyan);color:var(--ink);box-shadow:0 10px 26px -16px rgba(43,232,198,.95)}
.btn--accent:hover{background:#5CF2DA}
.btn--accent:active{background:var(--cyan-dim);color:var(--mist)}
.btn--orange{background:var(--orange);color:#1A0B02;box-shadow:0 10px 26px -16px rgba(255,138,61,.95)}
.btn--orange:hover{background:#FFA267}
.btn--orange:active{background:var(--orange-dim);color:var(--mist)}
.btn--ghost{background:rgba(24,64,95,.5);border-color:var(--line);color:var(--mist)}
.btn--ghost:hover{border-color:rgba(43,232,198,.55);color:var(--cyan);background:rgba(24,64,95,.72)}
.btn--line{background:transparent;border-color:rgba(43,232,198,.55);color:var(--cyan)}
.btn--line:hover{background:rgba(43,232,198,.12)}

/* ---------- tags / breadcrumbs ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 11px;
  border:1px solid var(--line);
  border-radius:var(--pill);
  font-size:12px;
  font-weight:700;
  letter-spacing:.1em;
  color:var(--slate);
}
.tag--cyan{color:var(--cyan);border-color:rgba(43,232,198,.42)}
.tag--orange{color:var(--orange);border-color:rgba(255,138,61,.42)}
.tag--signal{color:var(--signal);border-color:rgba(245,213,71,.42)}

.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  font-size:13px;
  letter-spacing:.02em;
  color:var(--slate);
}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li+li::before{content:"/";color:var(--line)}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs [aria-current="page"]{color:var(--mist)}

/* ---------- sections & grids ---------- */
.section{padding:64px 0}
.section--tight{padding:40px 0}
.section-head{display:grid;gap:14px;max-width:760px;margin-bottom:32px}
.page-head{display:grid;gap:16px;padding:28px 0 8px}
.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--12{grid-template-columns:repeat(12,minmax(0,1fr))}
@media (max-width:900px){
  .grid--2,.grid--3,.grid--12{grid-template-columns:minmax(0,1fr)}
  .section{padding:48px 0}
}

/* ---------- board ---------- */
.board{
  position:relative;
  padding:24px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(180deg,rgba(13,42,66,.72),rgba(6,24,41,.72));
  box-shadow:var(--shadow-soft);
}
.board::after{
  content:"";
  position:absolute;
  inset:0;
  border-radius:inherit;
  pointer-events:none;
  box-shadow:inset 0 1px 0 rgba(233,242,249,.06);
}
.board--accent{border-color:rgba(43,232,198,.4)}
.board--orange{border-color:rgba(255,138,61,.36)}
.board-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:16px}
.board-title{font-size:18px;font-weight:800;letter-spacing:-.01em}
.board-note{font-size:13px;color:var(--slate)}

/* ---------- stat ---------- */
.stat{display:grid;gap:4px}
.stat-num{
  font-size:clamp(28px,4vw,48px);
  font-weight:700;
  line-height:1.05;
  color:var(--cyan);
}
.stat-num--orange{color:var(--orange)}
.stat-label{font-size:12px;font-weight:700;letter-spacing:.16em;color:var(--slate)}

/* ---------- tabs ---------- */
.tabs{display:block}
.tab-list{
  display:flex;
  gap:6px;
  padding:6px;
  border:1px solid var(--line);
  border-radius:var(--pill);
  background:rgba(13,42,66,.62);
  overflow-x:auto;
  scrollbar-width:thin;
}
.tab{
  flex:0 0 auto;
  padding:10px 18px;
  border-radius:var(--pill);
  font-size:14.5px;
  font-weight:800;
  color:var(--slate);
  white-space:nowrap;
  transition:color .2s ease,background-color .2s ease;
}
.tab:hover{color:var(--mist)}
.tab[aria-selected="true"]{background:var(--cyan);color:var(--ink)}
.tab-panel{padding-top:22px}
.tab-panel[hidden]{display:none}
@keyframes panel-slide{from{opacity:0;transform:translateX(16px)}to{opacity:1;transform:none}}
.tab-panel:not([hidden]){animation:panel-slide .28s ease both}

/* ---------- media frames（页面阶段放 <img>） ---------- */
.media{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(145deg,var(--night),var(--deep));
  box-shadow:var(--shadow-soft);
}
.media img,
.media video{width:100%;height:100%;object-fit:cover}
.media--banner{aspect-ratio:21/9}
.media--wide{aspect-ratio:16/9}
.media--photo{aspect-ratio:4/3}
.media--square{aspect-ratio:1/1}
.media--tall{aspect-ratio:3/4}
.media--placeholder{
  display:grid;
  place-items:center;
  background-image:
    repeating-linear-gradient(122deg,rgba(30,68,98,.6) 0 1px,transparent 1px 22px),
    linear-gradient(145deg,rgba(13,42,66,.9),rgba(6,24,41,.9));
}
.media-label{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--slate);
  text-transform:uppercase;
}
.media-caption{margin-top:10px;font-size:13px;color:var(--slate)}
.media__tag{
  position:absolute;
  left:14px;
  bottom:14px;
  padding:5px 11px;
  border-radius:var(--pill);
  background:rgba(6,24,41,.78);
  border:1px solid rgba(43,232,198,.4);
  color:var(--cyan);
  font-size:12px;
  font-weight:700;
  letter-spacing:.08em;
}
@media (max-width:640px){
  .media--banner{aspect-ratio:16/9}
  .media--tall{aspect-ratio:4/5}
}

/* ---------- prose ---------- */
.prose{max-width:70ch}
.prose > * + *{margin-top:1.1em}
.prose h2{margin-top:1.9em;font-size:clamp(24px,3vw,34px)}
.prose h3{margin-top:1.6em;font-size:22px}
.prose p,.prose li{color:#CBDCE9}
.prose ul,.prose ol{padding-left:1.4em;list-style:disc;color:#CBDCE9}
.prose ol{list-style:decimal}
.prose li+li{margin-top:.45em}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(43,232,198,.45)}
.prose a:hover{color:#5CF2DA}
.prose strong{color:var(--mist);font-weight:800}
.prose blockquote{border-left:2px solid var(--orange);padding-left:16px;color:var(--slate);font-size:17px}
.prose table{font-size:15px}
.prose th,.prose td{padding:11px 12px;border-bottom:1px solid var(--line);text-align:left}
.prose th{font-size:12px;font-weight:700;letter-spacing:.14em;color:var(--slate)}
.prose td{color:#CBDCE9}

/* ---------- reveal ---------- */
html.has-js .reveal{
  opacity:0;
  transform:translate3d(-16px,16px,0);
  transition:opacity .34s ease,transform .34s cubic-bezier(.2,.7,.3,1);
}
html.has-js .reveal--right{transform:translate3d(16px,16px,0)}
html.has-js .reveal.is-visible{opacity:1;transform:none}

/* ============================================================
   skip link
   ============================================================ */
.skip-link{
  position:fixed;
  top:10px;
  left:50%;
  z-index:200;
  padding:10px 18px;
  border-radius:var(--pill);
  background:var(--cyan);
  color:var(--ink);
  font-size:14px;
  font-weight:800;
  transform:translateX(-50%) translateY(-240%);
  transition:transform .2s ease;
}
.skip-link:focus{transform:translateX(-50%) translateY(0)}

/* ============================================================
   header · 悬浮胶囊浮岛
   ============================================================ */
.site-header{
  position:fixed;
  top:14px;
  left:0;
  right:0;
  margin-inline:auto;
  width:min(var(--shell),100% - 28px);
  z-index:80;
  transition:top .3s ease,bottom .3s ease;
}
.site-header[data-condensed="true"]{top:auto;bottom:14px}

.header-shell{
  display:flex;
  align-items:center;
  gap:10px;
  padding:9px 12px 9px 14px;
  border:1px solid var(--line);
  border-radius:var(--pill);
  background:rgba(9,28,46,.84);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  backdrop-filter:blur(16px) saturate(140%);
  box-shadow:var(--shadow-float);
  transition:background-color .3s ease,border-color .3s ease,padding .3s ease;
}
.site-header[data-condensed="true"] .header-shell{
  padding:7px 10px 7px 12px;
  background:rgba(9,28,46,.95);
  border-color:rgba(43,232,198,.3);
}

/* brand */
.brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  flex:0 0 auto;
  padding:3px 8px 3px 3px;
  border-radius:var(--pill);
}
.brand-mark{
  position:relative;
  flex:0 0 auto;
  width:30px;
  height:30px;
  border-radius:10px;
  background:linear-gradient(150deg,var(--cyan),var(--cyan-dim));
  box-shadow:0 0 0 1px rgba(43,232,198,.35),0 10px 20px -12px rgba(43,232,198,.95);
}
.brand-mark::after{
  content:"";
  position:absolute;
  inset:8px 5px;
  border-radius:2px;
  background:var(--deep);
  transform:skewX(-16deg);
}
.brand-text{display:grid;line-height:1.18}
.brand-name{font-size:16px;font-weight:900;letter-spacing:.02em;color:var(--mist)}
.brand-line{font-size:11px;letter-spacing:.12em;color:var(--slate)}
.site-header[data-condensed="true"] .brand-line{display:none}

/* nav */
.site-nav{
  display:flex;
  align-items:center;
  gap:10px;
  margin-left:auto;
}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-list a{
  display:block;
  padding:9px 13px;
  border-radius:var(--pill);
  font-size:14.5px;
  font-weight:700;
  color:var(--slate);
  white-space:nowrap;
  transition:color .2s ease,background-color .2s ease;
}
.nav-list a:hover{color:var(--mist);background:rgba(43,232,198,.1)}
.nav-list a[aria-current="page"]{color:var(--ink);background:var(--cyan)}
.nav-rail{display:none}

.header-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.site-header[data-condensed="true"] .header-actions{margin-left:auto}

/* toggle */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:9px 14px;
  border:1px solid var(--line);
  border-radius:var(--pill);
  background:rgba(24,64,95,.5);
  color:var(--mist);
  font-size:14px;
  font-weight:800;
}
.nav-toggle:hover{border-color:rgba(43,232,198,.5);color:var(--cyan)}
.nav-toggle-icon{display:grid;gap:4px;width:16px}
.nav-toggle-icon i{display:block;height:2px;border-radius:2px;background:currentColor;transition:transform .25s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon i:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon i:last-child{transform:translateY(-3px) rotate(-45deg)}
.nav-toggle-label{font-size:14px}

/* progress */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:3px;
  z-index:90;
  background:rgba(30,68,98,.5);
  pointer-events:none;
}
.scroll-progress span{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  transition:transform .12s linear;
}

/* condensed（桌面） */
@media (min-width:1081px){
  .site-header[data-condensed="true"] .nav-list{display:none}
  .site-header[data-condensed="true"] .nav-rail{display:none}
}

/* 移动：胶囊收为“品牌 + 栏目”，导航侧滑面板 */
@media (max-width:1080px){
  .nav-toggle{display:inline-flex}
  .header-actions{display:none}
  .brand-line{display:none}

  .site-nav{
    position:fixed;
    left:0;
    right:0;
    top:calc(14px + 62px);
    margin-inline:auto;
    width:min(560px,100% - 28px);
    display:flex;
    flex-direction:column;
    align-items:stretch;
    gap:8px;
    padding:12px;
    border:1px solid var(--line);
    border-radius:24px;
    background:rgba(9,28,46,.97);
    -webkit-backdrop-filter:blur(18px);
    backdrop-filter:blur(18px);
    box-shadow:var(--shadow-float);
    max-height:calc(100vh - 140px);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    pointer-events:none;
    transform:translateY(-10px);
    transition:opacity .22s ease,transform .26s ease,visibility .22s;
  }
  .site-nav[data-open="true"]{opacity:1;visibility:visible;pointer-events:auto;transform:translateY(0)}
  .nav-list{flex-direction:column;align-items:stretch;gap:4px}
  .nav-list a{padding:13px 14px;font-size:16px;border-radius:14px;white-space:normal}
  .nav-rail{
    display:flex;
    flex-direction:column;
    gap:8px;
    padding-top:10px;
    border-top:1px solid var(--line);
  }
  .nav-rail .btn{width:100%}

  .site-header[data-condensed="true"] .site-nav{top:auto;bottom:calc(14px + 58px);transform:translateY(10px)}
  .site-header[data-condensed="true"] .site-nav[data-open="true"]{transform:translateY(0)}
}

@media (max-width:420px){
  .nav-toggle-label{display:none}
  .brand-name{font-size:15px}
}

/* ============================================================
   footer · 品牌叙事 + 四栏索引
   ============================================================ */
.site-footer{
  margin-top:96px;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(6,24,41,.35),rgba(13,42,66,.9));
}
.footer-shell{
  width:min(var(--shell),100% - var(--gutter));
  margin-inline:auto;
  display:grid;
  grid-template-columns:minmax(220px,1fr) 2.3fr;
  gap:40px;
  padding:56px 0 40px;
}
.footer-lead{display:grid;gap:16px;align-content:start}
.brand--footer{padding:0}
.footer-note{font-size:15px;color:#CBDCE9;max-width:26ch}
.footer-hours{
  font-size:13px;
  color:var(--slate);
  padding-top:14px;
  border-top:1px solid var(--line);
}
.footer-nav{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:28px 20px;
}
.footer-col{display:block}
.footer-title{
  font-size:12px;
  font-weight:800;
  letter-spacing:.16em;
  color:var(--cyan);
  padding-bottom:10px;
  margin-bottom:13px;
  border-bottom:1px solid var(--line);
}
.footer-list{display:grid;gap:9px}
.footer-list a{
  font-size:14.5px;
  color:var(--slate);
  border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.footer-list a:hover{color:var(--mist);border-color:rgba(255,138,61,.7)}

.footer-base{
  width:min(var(--shell),100% - var(--gutter));
  margin-inline:auto;
  padding:20px 0 42px;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 28px;
  font-size:13px;
  color:var(--slate);
}
.footer-contact{max-width:52ch}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 16px;align-items:center}
.footer-legal a{color:var(--slate);border-bottom:1px solid transparent;transition:color .2s ease,border-color .2s ease}
.footer-legal a:hover{color:var(--cyan);border-color:currentColor}
.footer-legal span{color:var(--stand)}
.footer-copy{font-size:12px;color:var(--stand)}

@media (max-width:960px){
  .footer-shell{grid-template-columns:minmax(0,1fr);gap:34px;padding:44px 0 32px}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px 18px}
  .footer-note{max-width:none}
}
@media (max-width:520px){
  .footer-nav{grid-template-columns:minmax(0,1fr)}
  .footer-base{flex-direction:column;align-items:flex-start;gap:14px}
}

/* ============================================================
   减弱动效
   ============================================================ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.has-js .reveal{opacity:1;transform:none;transition:none}
  .tab-panel:not([hidden]){animation:none}
}