/* ============================================================
   爱体育看台 · 共享样式 /assets/site.css
   深墨底 + 荧光绿 + 电光橙 + 暖纸插页
   ============================================================ */

:root{
  --ink-900:#070B14;
  --ink-800:#0E1626;
  --ink-700:#1B2740;
  --paper-100:#F3EBDA;
  --on-paper:#14181F;
  --volt-green:#B7FF3C;
  --volt-orange:#FF6A1F;
  --gray-400:#8A97AB;
  --white:#FFFFFF;
  --alert-red:#FF4D5E;

  --font-display:'Archivo Narrow','Oswald','Arial Narrow','Noto Sans SC',sans-serif;
  --font-mono:'JetBrains Mono','IBM Plex Mono',ui-monospace,'SFMono-Regular',Menlo,monospace;
  --font-body:'Noto Sans SC','PingFang SC','HarmonyOS Sans','Microsoft YaHei',sans-serif;

  --maxw:1240px;
  --edge:clamp(20px,6vw,96px);
  --gap:24px;
  --header-h:76px;
  --ease:cubic-bezier(.2,.7,.2,1);
  --dur:260ms;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 16px);
}
body,h1,h2,h3,h4,h5,p,ul,ol,dl,dd,figure,blockquote,pre{margin:0;}
ul[class],ol[class]{list-style:none;padding:0;}
img,svg,video{max-width:100%;}
img{display:block;border:0;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
a{color:inherit;text-decoration:none;}
table{border-collapse:collapse;width:100%;}
hr{border:0;}

/* ---------- 基础排版 ---------- */
body{
  background:var(--ink-900);
  color:var(--white);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}

::selection{background:var(--volt-green);color:var(--ink-900);}

:focus-visible{
  outline:2px solid var(--volt-green);
  outline-offset:3px;
  border-radius:2px;
}
.panel-paper :focus-visible{outline-color:var(--on-paper);}

#main-content{padding-top:var(--header-h);}
#main-content[data-overlay-hero]{padding-top:0;}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:300;
  padding:11px 18px;
  background:var(--volt-green);
  color:var(--ink-900);
  font-size:14px;
  font-weight:600;
  border-radius:2px;
  transform:translateY(-180%);
  transition:transform 180ms var(--ease);
}
.skip-link:focus{transform:translateY(0);}

/* ---------- 头部 ---------- */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:100;
  color:var(--white);
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background 260ms var(--ease),border-color 260ms var(--ease),backdrop-filter 260ms var(--ease);
}
.site-header[data-stuck],
.site-header[data-nav-open]{
  background:rgba(7,11,20,.94);
  border-bottom-color:var(--ink-700);
  -webkit-backdrop-filter:blur(12px) saturate(140%);
  backdrop-filter:blur(12px) saturate(140%);
}

.header-progress{
  position:absolute;
  top:0;left:0;right:0;
  height:2px;
  background:rgba(255,255,255,.06);
  pointer-events:none;
}
.header-progress__bar{
  display:block;
  height:100%;
  width:0;
  background:var(--volt-green);
  box-shadow:0 0 12px rgba(183,255,60,.55);
}

.header-inner{
  position:relative;
  width:100%;
  max-width:calc(var(--maxw) + var(--edge) * 2);
  margin-inline:auto;
  min-height:var(--header-h);
  padding:0 var(--edge);
  display:flex;
  align-items:center;
  gap:clamp(14px,2.4vw,36px);
}

/* 字标 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:none;
  padding:6px 0;
  color:var(--white);
}
.brand-mark{
  width:34px;
  height:17px;
  flex:none;
  color:var(--volt-green);
  overflow:visible;
}
.brand-text{
  font-family:var(--font-display);
  font-weight:800;
  font-size:19px;
  line-height:1;
  letter-spacing:.01em;
  white-space:nowrap;
}
.brand-sub{
  font-family:var(--font-mono);
  font-size:10px;
  line-height:1;
  letter-spacing:.22em;
  color:var(--gray-400);
  align-self:flex-end;
  padding-bottom:2px;
}

/* 导航 */
.site-nav{margin:0;}
.nav-list{
  display:flex;
  align-items:center;
  gap:clamp(12px,1.8vw,30px);
  margin:0;
  padding:0;
  list-style:none;
}
.nav-list a{
  position:relative;
  display:inline-block;
  padding:8px 0;
  font-size:14px;
  font-weight:500;
  letter-spacing:.04em;
  color:rgba(243,235,218,.70);
  white-space:nowrap;
  transition:color 200ms var(--ease);
}
.nav-list a::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  height:2px;
  width:0;
  background:var(--volt-green);
  transition:width 220ms var(--ease);
}
.nav-list a:hover{color:var(--white);}
.nav-list a:hover::after{width:100%;}
.nav-list a[aria-current="page"]{color:var(--white);}
.nav-list a[aria-current="page"]::after{width:18px;}

.header-actions{
  display:flex;
  align-items:center;
  gap:12px;
  flex:none;
  margin-left:auto;
}

/* 移动菜单按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 13px;
  color:var(--volt-green);
  background:rgba(183,255,60,.05);
  border:1px solid rgba(183,255,60,.45);
  border-radius:2px;
  transition:background 200ms var(--ease),border-color 200ms var(--ease);
}
.nav-toggle:hover{background:rgba(183,255,60,.14);border-color:var(--volt-green);}
.nav-toggle__icon{
  display:flex;
  flex-direction:column;
  gap:4px;
  width:18px;
}
.nav-toggle__icon span{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform 220ms var(--ease),opacity 160ms linear,width 220ms var(--ease);
}
.nav-toggle__icon span:nth-child(1){width:18px;}
.nav-toggle__icon span:nth-child(2){width:12px;}
.nav-toggle__icon span:nth-child(3){width:16px;}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(1){width:18px;transform:translateY(6px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(3){width:18px;transform:translateY(-6px) rotate(-45deg);}
.nav-toggle__text{
  font-size:13px;
  font-weight:500;
  letter-spacing:.08em;
}

/* ---------- 按钮 ---------- */
.btn{
  --btn-bg:transparent;
  --btn-fg:var(--white);
  --btn-bd:var(--ink-700);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  font-family:var(--font-body);
  font-size:14px;
  font-weight:500;
  line-height:1.2;
  letter-spacing:.02em;
  white-space:nowrap;
  color:var(--btn-fg);
  background:var(--btn-bg);
  border:1px solid var(--btn-bd);
  border-radius:2px;
  transition:background 220ms var(--ease),color 220ms var(--ease),border-color 220ms var(--ease),transform 220ms var(--ease);
}
.btn:hover{transform:translateY(-1px);}
.btn:active{transform:translateY(0);}

.btn--ghost{
  --btn-fg:var(--volt-green);
  --btn-bd:rgba(183,255,60,.55);
  --btn-bg:rgba(183,255,60,.06);
}
.btn--ghost:hover{
  --btn-bg:var(--volt-green);
  --btn-fg:var(--ink-900);
  --btn-bd:var(--volt-green);
}
.btn--solid{
  --btn-bg:var(--volt-green);
  --btn-fg:var(--ink-900);
  --btn-bd:var(--volt-green);
}
.btn--solid:hover{
  --btn-bg:#d3ff86;
  --btn-bd:#d3ff86;
}
.btn--orange{
  --btn-bg:var(--volt-orange);
  --btn-fg:#0A0E17;
  --btn-bd:var(--volt-orange);
}
.btn--orange:hover{
  --btn-bg:#ff8a4d;
  --btn-bd:#ff8a4d;
}
.btn--line{
  --btn-fg:var(--white);
  --btn-bd:var(--ink-700);
}
.btn--line:hover{
  --btn-fg:var(--volt-green);
  --btn-bd:var(--volt-green);
}

/* ---------- 容器与网格 ---------- */
.container{
  width:100%;
  max-width:calc(var(--maxw) + var(--edge) * 2);
  margin-inline:auto;
  padding-inline:var(--edge);
}
.container--narrow{
  max-width:calc(760px + var(--edge) * 2);
}
.grid{display:grid;gap:var(--gap);}
.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));}
.stack{display:grid;gap:clamp(16px,2.4vw,28px);}
.stack--tight{gap:12px;}
.rule{height:1px;background:var(--ink-700);}

/* ---------- 版式组件 ---------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--gray-400);
}
.eyebrow::before{
  content:"";
  width:18px;
  height:1px;
  background:var(--volt-green);
  flex:none;
}
.eyebrow--plain::before{display:none;}

.title-xl{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(40px,7.6vw,96px);
  line-height:.92;
  letter-spacing:-.01em;
}
.title-lg{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(28px,4.4vw,64px);
  line-height:1;
  letter-spacing:-.01em;
}
.title-md{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(22px,2.6vw,40px);
  line-height:1.08;
  letter-spacing:-.005em;
}
.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  letter-spacing:-.02em;
}
.lede{
  font-size:clamp(16px,1.6vw,18px);
  line-height:1.7;
  color:rgba(243,235,218,.82);
  max-width:62ch;
}
.note{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  line-height:1.7;
  color:var(--gray-400);
}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 9px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  line-height:1.4;
  color:var(--gray-400);
  border:1px solid var(--ink-700);
  border-radius:2px;
  white-space:nowrap;
}
.tag--green{
  color:var(--volt-green);
  border-color:rgba(183,255,60,.40);
  background:rgba(183,255,60,.10);
}
.tag--orange{
  color:var(--volt-orange);
  border-color:rgba(255,106,31,.42);
  background:rgba(255,106,31,.10);
}
.tag--red{
  color:var(--alert-red);
  border-color:rgba(255,77,94,.42);
  background:rgba(255,77,94,.10);
}

/* ---------- 暖纸插页 ---------- */
.panel-paper{
  background:var(--paper-100);
  color:var(--on-paper);
  padding:clamp(24px,4vw,56px);
  line-height:1.8;
}
.panel-paper h2,
.panel-paper h3,
.panel-paper h4{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.15;
  letter-spacing:-.005em;
}
.panel-paper a{color:var(--on-paper);text-decoration:underline;text-decoration-color:var(--volt-orange);text-underline-offset:3px;}
.panel-paper a:hover{text-decoration-color:var(--on-paper);}
.panel-paper .rule{background:rgba(20,24,31,.14);}
.panel-paper .note{color:rgba(20,24,31,.62);}

/* ---------- 卡片 ---------- */
.card{
  position:relative;
  background:var(--ink-800);
  border:1px solid var(--ink-700);
  padding:clamp(16px,2vw,24px);
  transition:border-color 260ms var(--ease),transform 260ms var(--ease),box-shadow 260ms var(--ease);
}
.card:hover{
  transform:translateY(-4px);
  border-color:var(--volt-green);
  box-shadow:0 14px 34px rgba(0,0,0,.38);
}
.card--flat{transition:border-color 260ms var(--ease);}
.card--flat:hover{transform:none;box-shadow:none;}

/* ---------- 媒体容器 ---------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  background:var(--ink-800);
  border:1px solid var(--ink-700);
}
.media > img,
.media > svg,
.media > picture,
.media > video{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media--4x3{aspect-ratio:4 / 3;}
.media--3x2{aspect-ratio:3 / 2;}
.media--1x1{aspect-ratio:1 / 1;}
.media--16x9{aspect-ratio:16 / 9;}
.media--fill{height:100%;aspect-ratio:auto;}
.media--clip{clip-path:polygon(0 0,100% 0,100% 84%,84% 100%,0 100%);}
.media--placeholder{
  background-image:repeating-linear-gradient(135deg,rgba(183,255,60,.075) 0 1px,transparent 1px 14px);
}
.media__badge{
  position:absolute;
  top:12px;
  left:12px;
  z-index:2;
}
.media__caption{
  display:block;
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  line-height:1.6;
  color:var(--gray-400);
}

/* ---------- 横向滚动轨道 ---------- */
.hscroll{
  display:flex;
  gap:16px;
  overflow-x:auto;
  scroll-snap-type:x proximity;
  padding-bottom:14px;
  -webkit-overflow-scrolling:touch;
  scrollbar-width:thin;
  scrollbar-color:var(--ink-700) transparent;
}
.hscroll > *{
  flex:0 0 auto;
  scroll-snap-align:start;
}
.hscroll::-webkit-scrollbar{height:4px;}
.hscroll::-webkit-scrollbar-track{background:transparent;}
.hscroll::-webkit-scrollbar-thumb{background:var(--ink-700);border-radius:2px;}

/* ---------- 面包屑 ---------- */
.breadcrumbs{
  padding-top:clamp(18px,3vw,30px);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--gray-400);
}
.breadcrumbs ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
}
.breadcrumbs li{display:inline-flex;align-items:center;gap:8px;}
.breadcrumbs li + li::before{
  content:"/";
  color:var(--ink-700);
}
.breadcrumbs a{color:var(--gray-400);transition:color 180ms var(--ease);}
.breadcrumbs a:hover{color:var(--volt-green);}
.breadcrumbs [aria-current="page"]{color:var(--paper-100);}

/* ---------- 章节索引 ---------- */
.section-index{
  display:flex;
  flex-direction:column;
  gap:2px;
}
[data-section-link]{
  position:relative;
  display:block;
  padding:7px 0 7px 15px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  line-height:1.5;
  color:var(--gray-400);
  border-left:1px solid var(--ink-700);
  transition:color 200ms var(--ease);
}
[data-section-link]::before{
  content:"";
  position:absolute;
  left:-1px;
  top:0;
  bottom:0;
  width:2px;
  background:transparent;
  transition:background 200ms var(--ease);
}
[data-section-link]:hover{color:var(--white);}
[data-section-link][data-active]{
  color:var(--volt-green);
}
[data-section-link][data-active]::before{
  background:var(--volt-green);
}

/* ---------- 页脚 ---------- */
.site-footer{
  margin-top:clamp(60px,9vw,140px);
  background:var(--ink-900);
  border-top:1px solid var(--ink-700);
  color:var(--gray-400);
}
.footer-inner{
  width:100%;
  max-width:calc(var(--maxw) + var(--edge) * 2);
  margin-inline:auto;
  padding:clamp(40px,6vw,80px) var(--edge) clamp(26px,4vw,48px);
  display:grid;
  grid-template-columns:minmax(0,1.15fr) minmax(0,.72fr) minmax(0,.72fr) minmax(0,1.35fr);
  gap:clamp(24px,3.4vw,56px);
  align-items:start;
}
.footer-col{min-width:0;}
.footer-col--offset{padding-top:clamp(0px,3vw,30px);}

.footer-mark{
  display:block;
  width:38px;
  height:19px;
  margin-bottom:14px;
  color:var(--volt-green);
  overflow:visible;
}
.footer-brand__name{
  font-family:var(--font-display);
  font-weight:800;
  font-size:24px;
  line-height:1.1;
  letter-spacing:.01em;
  color:var(--white);
}
.footer-brand__note{
  margin-top:12px;
  max-width:26ch;
  font-size:14px;
  line-height:1.75;
  color:var(--gray-400);
}
.footer-brand__domain{
  margin-top:16px;
  font-size:12px;
  letter-spacing:.06em;
  color:var(--ink-700);
  color:rgba(138,151,171,.75);
}

.footer-col__title{
  margin-bottom:16px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--volt-green);
}
.footer-list{
  display:grid;
  gap:10px;
  margin:0;
  padding:0;
  list-style:none;
}
.footer-list a{
  display:inline-block;
  font-size:14px;
  line-height:1.6;
  color:var(--gray-400);
  transition:color 180ms var(--ease);
}
.footer-list a:hover{color:var(--white);}
.footer-list--terms{
  margin-top:20px;
  padding-top:16px;
  border-top:1px solid var(--ink-700);
}

.footer-meta{
  display:block;
  margin:0;
}
.footer-meta__label{
  margin-top:14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:400;
  letter-spacing:.16em;
  line-height:1.5;
  color:rgba(138,151,171,.8);
}
.footer-meta__label:first-child{margin-top:0;}
.footer-meta__value{
  margin:3px 0 0;
  font-size:14px;
  line-height:1.7;
  color:var(--paper-100);
  overflow-wrap:anywhere;
}

.footer-base{
  width:100%;
  max-width:calc(var(--maxw) + var(--edge) * 2);
  margin-inline:auto;
  padding:20px var(--edge) 34px;
  border-top:1px solid var(--ink-700);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px 32px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  line-height:1.6;
  color:rgba(138,151,171,.85);
}
.footer-base__line{margin:0;}

/* ---------- 显现 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity 320ms var(--ease),transform 320ms var(--ease);
  will-change:opacity,transform;
}
[data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- 响应式 ---------- */
@media (max-width:1023px){
  :root{--header-h:64px;}

  .nav-toggle{display:inline-flex;}

  .site-nav{
    position:fixed;
    top:var(--header-h);
    left:0;
    right:0;
    margin:0;
    max-height:calc(100vh - var(--header-h));
    max-height:calc(100dvh - var(--header-h));
    overflow-y:auto;
    padding:8px var(--edge) 26px;
    background:var(--ink-800);
    border-bottom:1px solid var(--ink-700);
    box-shadow:0 24px 48px rgba(0,0,0,.5);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    pointer-events:none;
    transition:opacity 200ms var(--ease),transform 200ms var(--ease),visibility 0s linear 200ms;
  }
  .site-nav[data-open]{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
    pointer-events:auto;
    transition:opacity 220ms var(--ease),transform 220ms var(--ease),visibility 0s;
  }

  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .nav-list li{border-bottom:1px solid var(--ink-700);}
  .nav-list li:last-child{border-bottom:0;}
  .nav-list a{
    display:block;
    padding:15px 2px;
    font-size:17px;
    letter-spacing:.03em;
    color:var(--paper-100);
  }
  .nav-list a::after{bottom:9px;}
  .nav-list a[aria-current="page"]::after{width:26px;}

  .footer-inner{
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:clamp(28px,4vw,44px);
  }
  .footer-col--offset{padding-top:0;}
  .footer-col--brand{grid-column:1 / -1;}
}

@media (max-width:760px){
  .header-actions .btn{display:none;}
  .brand-text{font-size:17px;}
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr);}
  .footer-base{font-size:11px;}
}

@media (max-width:560px){
  .brand-sub{display:none;}
  .brand-mark{width:28px;height:14px;}
  .nav-toggle{padding:8px 11px;gap:8px;}
  .nav-toggle__text{display:none;}
  .footer-inner{grid-template-columns:minmax(0,1fr);}
  .media--clip{clip-path:none;}
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{
    opacity:1;
    transform:none;
  }
  .card:hover{transform:none;}
  .btn:hover{transform:none;}
}