/* =========================================================
   三亿赛场 · 共享样式表  /assets/site.css
   图层顺序：坐标层（网格与刻度）— 索引层（编号与标签）— 面板层（内容卡片）
   ========================================================= */

/* ---------- 1. 设计变量 ---------- */
:root{
  --c-ink:#0A0D10;
  --c-panel:#131A20;
  --c-capsule:#1E272F;
  --c-line:#2B3742;
  --c-body:#96A3AE;
  --c-head:#E9F1F6;
  --c-cyan:#19E3C6;
  --c-orange:#FF7A29;
  --c-data-deep:#1C4A4C;
  --c-data-viz:#3E7F84;
  --c-glow:#8FF3E4;
  --c-on-accent:#04211D;

  --font-display:"Barlow Condensed","Oswald","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --fs-index:12px;
  --fs-body:16px;
  --fs-sub:20px;
  --fs-block:clamp(1.5rem,2.6vw,2rem);
  --fs-page:clamp(2.6rem,6vw,5rem);

  --sp:8px;
  --w-max:1440px;
  --w-text:1200px;
  --w-read:68ch;

  --r-pill:999px;
  --r-panel:16px;
  --t-fast:160ms;
  --t-base:200ms;
  --ease:cubic-bezier(.22,.68,.28,1);
}

/* ---------- 2. 重置与坐标层 ---------- */
*,
*::before,
*::after{box-sizing:border-box;}

html{
  background-color:var(--c-ink);
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:110px;
}

body{
  position:relative;
  z-index:0;
  margin:0;
  min-height:100vh;
  background-color:transparent;
  color:var(--c-body);
  font-family:var(--font-body);
  font-size:var(--fs-body);
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(43,55,66,.42) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(43,55,66,.42) 1px,transparent 1px);
  background-size:72px 72px;
  -webkit-mask-image:radial-gradient(125% 95% at 50% 0%,#000 0%,rgba(0,0,0,.34) 62%,transparent 100%);
  mask-image:radial-gradient(125% 95% at 50% 0%,#000 0%,rgba(0,0,0,.34) 62%,transparent 100%);
}

body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(58% 40% at 10% -6%,rgba(25,227,198,.13),transparent 70%),
    radial-gradient(48% 34% at 94% 6%,rgba(255,122,41,.09),transparent 70%);
}

img,picture,svg{max-width:100%;}
img{height:auto;display:block;}

h1,h2,h3,h4,h5,h6{
  margin:0 0 .5em;
  color:var(--c-head);
  font-family:var(--font-display);
  font-weight:400;
  line-height:1.14;
  letter-spacing:-.01em;
}

p{margin:0 0 1em;}
p:last-child{margin-bottom:0;}

a{color:var(--c-cyan);text-decoration:none;}
a:hover{color:var(--c-glow);}

ul,ol{margin:0 0 1em;padding-left:1.1em;}
li{margin:0;}

button{font:inherit;}

hr{border:0;border-top:1px solid var(--c-line);margin:clamp(20px,3vw,36px) 0;}

::selection{background:rgba(25,227,198,.28);color:var(--c-head);}

:focus-visible{
  outline:2px solid var(--c-glow);
  outline-offset:3px;
  border-radius:4px;
}

/* ---------- 3. 跳转链接 ---------- */
.skip-link{
  position:absolute;
  top:-90px;
  left:16px;
  z-index:140;
  padding:10px 18px;
  border-radius:var(--r-pill);
  background:var(--c-cyan);
  color:var(--c-on-accent);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.06em;
  transition:top var(--t-fast) var(--ease);
}
.skip-link:focus{top:14px;color:var(--c-on-accent);}

/* ---------- 4. 头部：悬浮胶囊导航 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  padding:14px clamp(12px,2.4vw,28px) 0;
}

.scroll-meter{
  position:fixed;
  top:0;
  right:0;
  left:0;
  height:2px;
  z-index:100;
  pointer-events:none;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--c-cyan) 0%,var(--c-glow) 48%,var(--c-orange) 100%);
  opacity:.95;
}

.header-shell{
  width:min(var(--w-max),100%);
  margin:0 auto;
  display:flex;
  align-items:center;
  gap:10px;
  padding:7px 10px 7px 16px;
  border:1px solid var(--c-line);
  border-radius:var(--r-pill);
  background:rgba(19,26,32,.82);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  backdrop-filter:blur(16px) saturate(140%);
  box-shadow:0 14px 34px rgba(0,0,0,.42),inset 0 1px 0 rgba(233,241,246,.04);
  transition:padding var(--t-fast) var(--ease),
             background-color var(--t-fast) var(--ease),
             border-color var(--t-fast) var(--ease),
             box-shadow var(--t-fast) var(--ease);
}

.site-header[data-shrink] .header-shell{
  padding-block:5px;
  background:rgba(10,13,16,.94);
  border-color:rgba(25,227,198,.26);
  box-shadow:0 10px 26px rgba(0,0,0,.55),0 0 0 1px rgba(25,227,198,.06);
}

.brand-cluster{
  display:flex;
  align-items:center;
  gap:8px;
  flex:0 0 auto;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:9px;
  color:var(--c-head);
}
.brand:hover{color:var(--c-head);}

.brand-mark{
  position:relative;
  display:block;
  width:22px;
  height:22px;
  border:1px solid rgba(25,227,198,.55);
  background:linear-gradient(135deg,rgba(25,227,198,.55) 0%,rgba(25,227,198,.05) 62%,transparent 78%);
  clip-path:polygon(0 0,100% 0,100% 62%,62% 100%,0 100%);
}
.brand-mark::after{
  content:"";
  position:absolute;
  left:5px;
  right:5px;
  top:13px;
  height:2px;
  background:var(--c-orange);
}

.brand-name{
  font-family:var(--font-display);
  font-size:20px;
  font-weight:400;
  letter-spacing:.02em;
  line-height:1.2;
}

.version-chip{
  padding:2px 8px;
  border:1px solid rgba(25,227,198,.4);
  border-radius:var(--r-pill);
  background:rgba(25,227,198,.09);
  color:var(--c-cyan);
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.7;
  letter-spacing:.12em;
  text-transform:uppercase;
  white-space:nowrap;
}

/* 主导航 */
.site-nav{
  flex:1 1 auto;
  min-width:0;
}

.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
  margin:0;
  padding:2px;
  list-style:none;
  overflow-x:auto;
  scrollbar-width:none;
  -ms-overflow-style:none;
}
.nav-list::-webkit-scrollbar{display:none;}

.nav-item{flex:0 0 auto;}

.nav-link{
  display:block;
  padding:7px 13px;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  color:var(--c-body);
  font-size:14px;
  line-height:1.4;
  white-space:nowrap;
  transition:color var(--t-fast) var(--ease),
             background-color var(--t-fast) var(--ease),
             border-color var(--t-fast) var(--ease);
}
.nav-link:hover{
  color:var(--c-head);
  background:var(--c-capsule);
  border-color:rgba(139,163,180,.24);
}
.nav-link[aria-current="page"]{
  color:var(--c-glow);
  background:rgba(25,227,198,.12);
  border-color:rgba(25,227,198,.45);
}
.nav-link[aria-current="page"]:hover{
  color:var(--c-glow);
  background:rgba(25,227,198,.18);
  border-color:var(--c-glow);
}

/* 快速入口 */
.header-quick{
  display:flex;
  align-items:center;
  gap:6px;
  flex:0 0 auto;
  margin-left:auto;
}

.quick-link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:7px 14px;
  border:1px solid var(--c-line);
  border-radius:var(--r-pill);
  color:var(--c-body);
  font-size:13px;
  font-weight:500;
  line-height:1.4;
  white-space:nowrap;
  transition:color var(--t-fast) var(--ease),
             border-color var(--t-fast) var(--ease),
             background-color var(--t-fast) var(--ease);
}
.quick-link::before{
  content:"";
  width:5px;
  height:5px;
  border-radius:50%;
  background:var(--c-data-viz);
  flex:0 0 auto;
  transition:background-color var(--t-fast) var(--ease);
}
.quick-link:hover{
  color:var(--c-glow);
  border-color:var(--c-glow);
}
.quick-link:hover::before{background:var(--c-orange);}

.quick-link--solid{
  background:var(--c-cyan);
  border-color:var(--c-cyan);
  color:var(--c-on-accent);
}
.quick-link--solid::before{background:var(--c-on-accent);}
.quick-link--solid:hover{
  background:var(--c-glow);
  border-color:var(--c-glow);
  color:var(--c-on-accent);
}
.quick-link--solid:hover::before{background:var(--c-on-accent);}

/* 移动端按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  padding:7px 12px;
  border:1px solid var(--c-line);
  border-radius:var(--r-pill);
  background:var(--c-capsule);
  color:var(--c-head);
  font-size:13px;
  line-height:1.4;
  cursor:pointer;
  transition:border-color var(--t-fast) var(--ease),color var(--t-fast) var(--ease);
}
.nav-toggle:hover{border-color:var(--c-glow);color:var(--c-glow);}

.nav-toggle-bars{
  position:relative;
  display:block;
  width:16px;
  height:10px;
  flex:0 0 auto;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:1.5px;
  background:currentColor;
  transition:transform var(--t-fast) var(--ease),top var(--t-fast) var(--ease);
}
.nav-toggle-bars::before{top:1px;}
.nav-toggle-bars::after{top:8px;}
.site-header[data-open] .nav-toggle-bars::before{top:5px;transform:rotate(45deg);}
.site-header[data-open] .nav-toggle-bars::after{top:5px;transform:rotate(-45deg);}

/* ---------- 5. 正文容器与基础组件 ---------- */
.main-content{display:block;outline:none;}

.wrap{
  width:min(var(--w-text),calc(100% - 32px));
  margin-inline:auto;
}
.wrap--wide{
  width:min(var(--w-max),calc(100% - 32px));
  margin-inline:auto;
}

.section{padding-block:clamp(40px,6vw,80px);}
.section--tight{padding-block:clamp(20px,3vw,40px);}

.page-title{
  font-size:var(--fs-page);
  font-weight:300;
  line-height:.98;
  letter-spacing:-.02em;
  margin:0 0 16px;
}

.section-heading{
  font-size:var(--fs-block);
  font-weight:400;
  letter-spacing:-.01em;
  margin:0 0 12px;
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0 0 12px;
  color:var(--c-cyan);
  font-family:var(--font-mono);
  font-size:var(--fs-index);
  letter-spacing:.16em;
  text-transform:uppercase;
}
.eyebrow::before{
  content:"";
  width:18px;
  height:1px;
  background:currentColor;
  flex:0 0 auto;
}

.prose{max-width:var(--w-read);}
.prose p{margin:0 0 1.1em;}
.prose strong{color:var(--c-head);font-weight:500;}

.label{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:var(--fs-index);
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--c-body);
}
.label--accent{color:var(--c-cyan);}
.label--time{color:var(--c-orange);}

/* 面包屑 */
.breadcrumb{
  padding-block:clamp(14px,2vw,22px);
}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:0;
  margin:0;
  padding:0;
  list-style:none;
  font-family:var(--font-mono);
  font-size:var(--fs-index);
  letter-spacing:.08em;
  text-transform:uppercase;
}
.breadcrumb-item{display:flex;align-items:center;}
.breadcrumb-item + .breadcrumb-item::before{
  content:"/";
  margin:0 10px;
  color:var(--c-line);
}
.breadcrumb-item a{
  color:var(--c-body);
  border-bottom:1px solid transparent;
  transition:color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}
.breadcrumb-item a:hover{
  color:var(--c-cyan);
  border-bottom-color:rgba(25,227,198,.5);
}
.breadcrumb-item [aria-current="page"]{color:var(--c-head);}

/* 面板 */
.panel{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  border:1px solid var(--c-line);
  background:var(--c-panel);
  clip-path:polygon(0 14px,14px 0,100% 0,100% calc(100% - 14px),calc(100% - 14px) 100%,0 100%);
}
.panel::before{
  content:"";
  position:absolute;
  top:1px;
  left:16px;
  width:38px;
  height:2px;
  background:var(--c-cyan);
}
.panel--data{background:linear-gradient(160deg,var(--c-data-deep) 0%,var(--c-panel) 68%);}
.panel--flat{background:var(--c-capsule);}
.panel--flat::before{background:var(--c-data-viz);}

/* 网格 */
.grid{
  display:grid;
  gap:16px;
}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr));}

.span-3{grid-column:span 3;}
.span-4{grid-column:span 4;}
.span-5{grid-column:span 5;}
.span-6{grid-column:span 6;}
.span-8{grid-column:span 8;}
.span-9{grid-column:span 9;}
.span-12{grid-column:span 12;}

/* 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 20px;
  border:1px solid var(--c-line);
  border-radius:var(--r-pill);
  background:transparent;
  color:var(--c-head);
  font-family:var(--font-body);
  font-size:14px;
  font-weight:500;
  line-height:1.5;
  cursor:pointer;
  transition:color var(--t-fast) var(--ease),
             border-color var(--t-fast) var(--ease),
             background-color var(--t-fast) var(--ease);
}
.btn--primary{
  background:var(--c-cyan);
  border-color:var(--c-cyan);
  color:var(--c-on-accent);
}
.btn--primary:hover{
  background:var(--c-glow);
  border-color:var(--c-glow);
  color:var(--c-on-accent);
}
.btn--ghost:hover{
  border-color:var(--c-glow);
  color:var(--c-glow);
}
.btn--line{
  border-color:rgba(25,227,198,.45);
  color:var(--c-cyan);
}
.btn--line:hover{
  background:rgba(25,227,198,.12);
  border-color:var(--c-glow);
  color:var(--c-glow);
}

/* 图片容器（页面阶段放置占位或合成图） */
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16 / 9;
  border:1px solid var(--c-line);
  background:
    linear-gradient(135deg,rgba(28,74,76,.55) 0%,rgba(19,26,32,.94) 70%),
    repeating-linear-gradient(45deg,rgba(43,55,66,.5) 0 1px,transparent 1px 12px);
}
.media-frame > img,
.media-frame > picture > img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(180deg,transparent 42%,rgba(10,13,16,.74) 100%);
}
.media-frame--wide{aspect-ratio:21 / 9;}
.media-frame--square{aspect-ratio:1 / 1;}
.media-frame--tall{aspect-ratio:3 / 4;}
.media-frame--bare::after{display:none;}

.media-caption{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:var(--fs-index);
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--c-body);
}

/* 返回顶部（由 site.js 注入） */
.to-top{
  position:fixed;
  right:clamp(14px,2.4vw,28px);
  bottom:clamp(14px,2.4vw,28px);
  z-index:70;
  width:46px;
  height:46px;
  display:grid;
  place-items:center;
  padding:0;
  border:1px solid var(--c-line);
  border-radius:50%;
  background:rgba(19,26,32,.92);
  color:var(--c-head);
  font-family:var(--font-mono);
  font-size:15px;
  line-height:1;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity var(--t-base) var(--ease),
             transform var(--t-base) var(--ease),
             visibility var(--t-base) var(--ease),
             border-color var(--t-fast) var(--ease),
             color var(--t-fast) var(--ease);
}
.to-top[data-visible]{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}
.to-top:hover{
  border-color:var(--c-glow);
  color:var(--c-glow);
}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,96px);
  border-top:1px solid var(--c-line);
  background:linear-gradient(180deg,rgba(10,13,16,0) 0%,rgba(19,26,32,.6) 28%,rgba(10,13,16,.96) 100%);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;
  left:0;
  width:100%;
  height:1px;
  background:linear-gradient(90deg,var(--c-cyan) 0%,transparent 32%,transparent 68%,var(--c-orange) 100%);
  opacity:.55;
}

.footer-shell{
  width:min(var(--w-max),calc(100% - 32px));
  margin-inline:auto;
  padding:clamp(36px,5vw,64px) 0 24px;
}

.footer-grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1.3fr;
  gap:clamp(20px,3vw,40px);
}

.footer-block{min-width:0;}

.footer-brand{
  display:inline-block;
  font-family:var(--font-display);
  font-size:26px;
  font-weight:400;
  letter-spacing:-.01em;
  color:var(--c-head);
  transition:color var(--t-fast) var(--ease);
}
.footer-brand:hover{color:var(--c-cyan);}

.footer-tagline{
  margin:10px 0 0;
  max-width:30ch;
  font-size:14px;
  color:var(--c-body);
}

.footer-note{
  margin:6px 0 0;
  font-size:13px;
  color:rgba(150,163,174,.75);
}

.footer-stamp{
  margin:14px 0 0;
  font-family:var(--font-mono);
  font-size:var(--fs-index);
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--c-cyan);
}

.footer-heading{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:var(--fs-index);
  font-weight:500;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--c-head);
}
.footer-heading::after{
  content:"";
  display:block;
  width:26px;
  height:1px;
  margin-top:8px;
  background:var(--c-cyan);
  opacity:.75;
}

.footer-list{
  display:flex;
  flex-direction:column;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
}
.footer-list li{display:flex;align-items:flex-start;}
.footer-list a{
  color:var(--c-body);
  font-size:14px;
  border-bottom:1px solid transparent;
  transition:color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}
.footer-list a:hover{
  color:var(--c-cyan);
  border-bottom-color:rgba(25,227,198,.5);
}

.footer-list--contact li{
  display:grid;
  grid-template-columns:74px minmax(0,1fr);
  gap:10px;
  align-items:baseline;
}

.footer-label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--c-data-viz);
}

.footer-value{
  font-size:14px;
  color:var(--c-head);
  word-break:break-word;
}
.footer-value--mono{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.06em;
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:10px 24px;
  margin-top:clamp(28px,4vw,48px);
  padding-top:16px;
  border-top:1px dashed var(--c-line);
  font-family:var(--font-mono);
  font-size:var(--fs-index);
  letter-spacing:.06em;
  color:rgba(150,163,174,.82);
}
.footer-legal,
.footer-stage{margin:0;}
.footer-stage-name{color:var(--c-orange);}

/* ---------- 7. 响应式 ---------- */
@media (max-width:1024px){
  .header-shell{
    flex-wrap:wrap;
    border-radius:22px;
    padding:8px 10px;
  }
  .brand-cluster{order:1;}
  .header-quick{order:2;margin-left:auto;}
  .nav-toggle{order:3;display:inline-flex;}
  .site-nav{
    order:4;
    flex:1 1 100%;
    display:none;
    min-width:0;
    margin-top:8px;
    padding-top:10px;
    border-top:1px solid var(--c-line);
  }
  .site-header[data-open] .site-nav{display:block;}
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:4px;
    padding:0;
    overflow:visible;
  }
  .nav-link{
    padding:11px 14px;
    border-radius:12px;
    font-size:15px;
  }

  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:900px){
  .span-3,
  .span-4,
  .span-5,
  .span-6,
  .span-8,
  .span-9,
  .span-12{grid-column:1 / -1;}
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr));}
}

@media (max-width:640px){
  body{font-size:15.5px;}
  .grid--12{grid-template-columns:repeat(1,minmax(0,1fr));}
  .section{padding-block:clamp(32px,8vw,56px);}
}

@media (max-width:560px){
  .footer-grid{grid-template-columns:1fr;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .footer-list--contact li{grid-template-columns:64px minmax(0,1fr);}
}

@media (max-width:480px){
  .brand-name{font-size:17px;}
  .version-chip{font-size:10px;padding:1px 6px;}
  .nav-toggle-text{display:none;}
  .nav-toggle{padding:8px 11px;}
  .quick-link{padding:6px 10px;font-size:12px;}
}

/* ---------- 8. 动效降级 ---------- */
@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;
  }
  .to-top{transform:none;}
}