/* ===== 博奥赛事 · 共享样式表 /assets/site.css ===== */

/* ---- reset ---- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
img,svg,video,canvas{display:block;max-width:100%}
table{border-collapse:collapse;width:100%}
hr{border:0;margin:0}

/* ---- 变量 ---- */
:root{
  --ink:#0B1F1A;
  --char:#101214;
  --graphite:#1C2420;
  --white:#F4F7F4;
  --mist:#9AA8A0;
  --lime:#C8FF3D;
  --orange:#FF6A1A;
  --red:#E23B2E;
  --amber:#F2C230;
  --line:#2E3A34;
  --pale:#D9E2DC;

  --font-head:'Barlow Condensed','Oswald','Noto Sans SC',system-ui,sans-serif;
  --font-body:'Noto Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  --font-data:'JetBrains Mono','Roboto Mono','Noto Sans Mono CJK SC',monospace;
  --font-index:'Barlow Condensed','Noto Sans SC',sans-serif;

  --ease:cubic-bezier(.2,.7,.3,1);
  --cut:20px;
  --header-h:84px;
  --wrap:1360px;
  --gutter:24px;
  --section-gap:clamp(72px,10vw,160px);
}

/* ---- 基础排版 ---- */
body{
  background:var(--ink);
  color:var(--white);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-head);
  font-weight:700;
  line-height:1.04;
  letter-spacing:.02em;
  text-transform:uppercase;
}
p{max-width:68ch}
::selection{background:var(--lime);color:var(--ink)}

:focus-visible{outline:2px solid var(--lime);outline-offset:2px}

/* ---- 跳转链接 ---- */
.skip-link{
  position:absolute;
  left:20px;
  top:-120px;
  z-index:200;
  padding:10px 18px;
  background:var(--lime);
  color:var(--ink);
  font-family:var(--font-index);
  font-size:13px;
  font-weight:600;
  letter-spacing:.14em;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
  transition:top 200ms var(--ease);
}
.skip-link:focus{top:12px}

/* ---- 通用工具类 ---- */
.wrap{width:min(var(--wrap),100% - 48px);margin-inline:auto}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

.h-display{font-size:clamp(3rem,8vw,7rem);line-height:.94;letter-spacing:.01em}
.h-page{font-size:clamp(2.25rem,5vw,4rem);line-height:1.02}
.index-label{
  display:inline-block;
  font-family:var(--font-index);
  font-size:13px;
  font-weight:500;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--mist);
}
.data{font-family:var(--font-data);font-size:.94em;letter-spacing:.02em}
.data--lime{color:var(--lime)}
.data--amber{color:var(--amber)}
.data--red{color:var(--red)}

.rule-slash{
  height:1px;
  border:0;
  background:repeating-linear-gradient(90deg,var(--line) 0 10px,transparent 10px 22px);
}

/* ---- 图片容器（页面阶段放 <img>） ---- */
.media-frame{
  position:relative;
  overflow:hidden;
  background:var(--graphite);
  clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%);
}
.media-frame > img,
.media-frame > picture > img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:grayscale(.35) contrast(1.14) saturate(.86) brightness(.9);
  transition:transform 260ms var(--ease),filter 260ms var(--ease);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  background:rgba(11,31,26,.32);
  pointer-events:none;
  transition:background 260ms var(--ease);
}
.media-frame:hover > img,
.media-frame:hover > picture > img{transform:scale(1.04);filter:grayscale(.1) contrast(1.18) saturate(1.02) brightness(.96)}
.media-frame:hover::after{background:rgba(11,31,26,.16)}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}

/* ---- 面板 / 标签 / 时间码 ---- */
.panel{
  background:var(--graphite);
  padding:clamp(22px,3vw,36px);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,0 100%);
}
.tag{
  --tag-bar:var(--line);
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:7px 14px 7px 15px;
  background:rgba(28,36,32,.86);
  color:var(--pale);
  font-family:var(--font-index);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  overflow:hidden;
  transition:color 200ms var(--ease),background 200ms var(--ease);
}
.tag::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  width:3px;
  height:0;
  background:var(--tag-bar);
  transform:translateY(-50%);
  transition:height 120ms var(--ease);
}
.tag:hover{color:var(--white);background:rgba(46,58,52,.9)}
.tag:hover::before{height:100%}
.tag[aria-pressed="true"],
.tag.is-active{color:var(--ink);background:var(--lime)}
.tag[aria-pressed="true"]::before,
.tag.is-active::before{height:100%;background:var(--ink)}
.tag--amber{--tag-bar:var(--amber)}
.tag--red{--tag-bar:var(--red)}

.timecode{
  display:inline-block;
  padding:3px 8px;
  font-family:var(--font-data);
  font-size:13px;
  letter-spacing:.02em;
  color:var(--pale);
  background:rgba(200,255,61,.12);
  transition:background 200ms var(--ease),color 200ms var(--ease);
}
.timecode--lit{background:var(--lime);color:var(--ink)}

/* ---- 按钮 ---- */
.btn{
  --btn-bg:rgba(244,247,244,.06);
  --btn-fg:var(--white);
  display:inline-flex;
  align-items:center;
  gap:.6em;
  padding:.9em 1.65em;
  background:var(--btn-bg);
  color:var(--btn-fg);
  font-family:var(--font-head);
  font-size:14px;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
  line-height:1;
  box-shadow:inset 0 0 0 1px var(--line);
  clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
  transition:background 200ms var(--ease),color 200ms var(--ease),transform 200ms var(--ease),box-shadow 200ms var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{--btn-bg:var(--orange);--btn-fg:#0B1F1A;box-shadow:none}
.btn--primary:hover{--btn-bg:var(--lime)}
.btn--ghost{--btn-bg:transparent}
.btn--ghost:hover{--btn-bg:rgba(200,255,61,.1);box-shadow:inset 0 0 0 1px var(--lime);color:var(--lime)}

/* ---- 面包屑 ---- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-index);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--mist);
}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"/";color:var(--line)}
.breadcrumb a{transition:color 180ms var(--ease)}
.breadcrumb a:hover{color:var(--lime)}
.breadcrumb [aria-current="page"]{color:var(--pale)}

/* ---- 区块标题 ---- */
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:10px 24px;
  margin-bottom:clamp(28px,4vw,48px);
}
.section-head h2{font-size:clamp(1.9rem,4vw,3rem)}
.section-head .section-index{
  font-family:var(--font-data);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--lime);
}

/* ---- 正文栏 ---- */
.prose{max-width:68ch;font-size:17px;line-height:1.85;color:var(--pale)}
.prose h2{margin-top:2em;font-size:clamp(1.6rem,3vw,2.2rem);color:var(--white)}
.prose h3{margin-top:1.6em;font-size:clamp(1.2rem,2vw,1.5rem);color:var(--white)}
.prose p + p{margin-top:1.1em}
.prose a{color:var(--lime);border-bottom:1px solid var(--orange)}
.prose a:hover{color:var(--orange);border-bottom-color:var(--lime)}
.prose ul,.prose ol{display:grid;gap:.6em;margin-top:1.1em}
.prose li{position:relative;padding-left:20px}
.prose li::before{content:"";position:absolute;left:0;top:.78em;width:10px;height:2px;background:var(--lime)}
.prose strong{color:var(--white);font-weight:600}

/* ---- 主内容占位 ---- */
#main-content{display:block;padding-top:var(--header-h)}

/* ---- 显现 ---- */
.js [data-reveal]{opacity:0;transform:translateY(10px);transition:opacity 240ms var(--ease),transform 240ms var(--ease)}
.js [data-reveal].is-visible{opacity:1;transform:none}

/* ================= 头部 ================= */
.site-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:90;
  background:linear-gradient(180deg,rgba(11,31,26,.94) 0%,rgba(11,31,26,.58) 62%,rgba(11,31,26,0) 100%);
  border-bottom:1px solid transparent;
  transition:background 220ms var(--ease),border-color 220ms var(--ease),box-shadow 220ms var(--ease);
}
.site-header.is-scrolled{
  background:var(--char);
  border-bottom-color:var(--line);
  box-shadow:0 16px 40px -32px rgba(0,0,0,.95);
}
.header-inner{
  width:min(var(--wrap),100% - 48px);
  margin-inline:auto;
  min-height:var(--header-h);
  display:flex;
  align-items:center;
  gap:28px;
  transition:min-height 220ms var(--ease);
}
.site-header.is-scrolled .header-inner{min-height:64px}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
  padding:6px 0;
}
.brand-mark{
  display:grid;
  place-items:center;
  width:34px;
  height:34px;
  flex:0 0 auto;
  background:var(--lime);
  color:var(--ink);
  font-family:var(--font-head);
  font-size:19px;
  font-weight:800;
  line-height:1;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
}
.brand-copy{display:grid;line-height:1.12}
.brand-name{
  font-family:var(--font-head);
  font-size:19px;
  font-weight:700;
  letter-spacing:.16em;
  color:var(--white);
}
.brand-sub{
  font-family:var(--font-index);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--mist);
  margin-top:3px;
}

/* 导航 */
.site-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-list a{
  --ul-x:14px;
  --ul-y:4px;
  position:relative;
  display:block;
  padding:10px 14px;
  font-family:var(--font-index);
  font-size:13px;
  font-weight:500;
  letter-spacing:.14em;
  color:var(--pale);
  transition:color 180ms var(--ease);
}
.nav-list a::after{
  content:"";
  position:absolute;
  left:var(--ul-x);
  right:var(--ul-x);
  bottom:var(--ul-y);
  height:2px;
  background:var(--lime);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform 200ms var(--ease);
}
.nav-list a:hover{color:var(--white)}
.nav-list a:hover::after{transform:scaleX(1)}
.nav-list a[aria-current="page"]{color:var(--white)}
.nav-list a[aria-current="page"]::after{transform:scaleX(1)}
.nav-tools{display:none}
.nav-tool{
  display:block;
  padding:15px 0;
  font-family:var(--font-index);
  font-size:13px;
  letter-spacing:.14em;
  color:var(--lime);
  border-top:1px solid var(--line);
}

/* 右侧工具 */
.header-tools{display:flex;align-items:center;gap:6px;flex:0 0 auto}
.tool-link{
  font-family:var(--font-index);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--mist);
  padding:8px 10px;
  transition:color 180ms var(--ease);
}
.tool-link:hover{color:var(--lime)}
.tool-collect{display:inline-flex;align-items:center;gap:8px;color:var(--pale)}
.collect-count{
  font-family:var(--font-data);
  font-size:11px;
  min-width:38px;
  text-align:center;
  padding:2px 5px;
  background:rgba(200,255,61,.14);
  color:var(--lime);
  transition:background 200ms var(--ease),color 200ms var(--ease);
}
.tool-collect[data-collected]{color:var(--orange)}
.tool-collect[data-collected] .collect-count{background:var(--orange);color:var(--ink)}

/* 汉堡 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 14px;
  background:var(--graphite);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
}
.nav-toggle-bars{position:relative;display:block;width:18px;height:2px;background:var(--lime);transition:background 200ms var(--ease)}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  background:var(--lime);
  transition:transform 200ms var(--ease),top 200ms var(--ease);
}
.nav-toggle-bars::before{top:-6px}
.nav-toggle-bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:0;transform:rotate(-45deg)}
.nav-toggle-label{font-family:var(--font-index);font-size:12px;letter-spacing:.14em;color:var(--pale)}

/* 滚动进度 */
.scroll-progress{
  position:absolute;
  left:0;
  bottom:0;
  height:2px;
  width:0;
  background:linear-gradient(90deg,var(--lime),var(--orange));
  opacity:0;
  transition:opacity 220ms var(--ease);
}
.site-header.is-scrolled .scroll-progress{opacity:1}

/* ================= 页脚 ================= */
.site-footer{
  position:relative;
  margin-top:clamp(80px,10vw,160px);
  background:var(--char);
  border-top:1px solid var(--line);
  color:var(--pale);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:5px;
  background:linear-gradient(90deg,var(--lime) 0 20%,var(--amber) 20% 32%,var(--red) 32% 42%,var(--line) 42% 100%);
}
.footer-inner{
  width:min(var(--wrap),100% - 48px);
  margin-inline:auto;
  padding:clamp(56px,7vw,96px) 0 clamp(40px,5vw,64px);
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.55fr);
  gap:clamp(40px,5vw,80px);
  align-items:start;
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:18px}
.brand--footer .brand-name{font-size:22px}
.brand--footer .brand-mark{width:40px;height:40px;font-size:22px}
.footer-note{max-width:34ch;font-size:14px;line-height:1.85;color:var(--mist)}
.footer-mobileline{
  font-size:13px;
  line-height:1.7;
  color:var(--mist);
  padding-left:14px;
  border-left:2px solid var(--line);
}
.footer-contact{
  width:100%;
  display:grid;
  gap:9px;
  margin-top:4px;
  padding-top:18px;
  border-top:1px solid var(--line);
}
.footer-contact-line{display:grid;grid-template-columns:auto minmax(0,1fr);gap:14px;font-size:13px;line-height:1.7;max-width:none}
.footer-contact-label{
  font-family:var(--font-index);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--lime);
  padding-top:2px;
}
.footer-contact-value{color:var(--pale)}
.footer-contact-value[data-mono]{font-family:var(--font-data);font-size:12.5px;letter-spacing:.02em}

.footer-cols{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:32px 24px;
  align-content:start;
}
.footer-col-title{
  font-family:var(--font-index);
  font-size:13px;
  font-weight:500;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--white);
  margin-bottom:16px;
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
}
.footer-col ul{display:grid;gap:11px}
.footer-col a{
  display:inline-block;
  font-size:14px;
  color:var(--mist);
  transition:color 180ms var(--ease),padding-left 180ms var(--ease);
}
.footer-col a:hover{color:var(--lime);padding-left:6px}

.footer-bar{border-top:1px solid var(--line);background:var(--ink)}
.footer-bar-inner{
  width:min(var(--wrap),100% - 48px);
  margin-inline:auto;
  padding:22px 0 34px;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 32px;
  font-family:var(--font-index);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--mist);
}
.footer-bar-inner p{max-width:none}
.footer-bar-inner p:first-child{margin-right:auto}
.footer-icp{color:var(--pale);font-family:var(--font-data);letter-spacing:.02em}

/* ================= 响应式 ================= */
@media (max-width:1024px){
  .footer-inner{grid-template-columns:minmax(0,1fr);gap:48px}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:960px){
  .header-inner{gap:16px}
  .tool-link,.tool-collect{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:fixed;
    top:0;
    right:0;
    bottom:0;
    z-index:95;
    width:min(340px,86vw);
    margin-left:0;
    padding:104px 28px 48px;
    background:var(--char);
    border-left:1px solid var(--line);
    overflow-y:auto;
    transform:translateX(102%);
    visibility:hidden;
    transition:transform 240ms var(--ease),visibility 240ms var(--ease);
  }
  .site-nav[data-open]{transform:translateX(0);visibility:visible}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-list a{
    --ul-x:0;
    --ul-y:0;
    padding:16px 0;
    font-size:15px;
    letter-spacing:.16em;
    border-bottom:1px solid var(--line);
  }
  .nav-tools{display:block;margin-top:26px}
  .nav-tools .nav-tool:last-child{border-bottom:1px solid var(--line)}
}

@media (max-width:640px){
  body{font-size:16px}
  .wrap{width:min(var(--wrap),100% - 40px)}
  .header-inner{width:min(var(--wrap),100% - 40px)}
  .brand-sub{display:none}
  .brand-name{font-size:16px;letter-spacing:.12em}
  .brand-mark{width:30px;height:30px;font-size:17px}
  .footer-inner{width:min(var(--wrap),100% - 40px)}
  .footer-cols{grid-template-columns:minmax(0,1fr);gap:28px}
  .footer-bar-inner{
    width:min(var(--wrap),100% - 40px);
    flex-direction:column;
    align-items:flex-start;
    gap:8px;
  }
  .footer-bar-inner p:first-child{margin-right:0}
}

/* ================= 动效降级 ================= */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  .js [data-reveal]{opacity:1;transform:none}
  .btn:hover{transform:none}
  .media-frame:hover > img,
  .media-frame:hover > picture > img{transform:none}
}