/* =========================================================
   V站体育 · /assets/site.css
   共享层：reset / 变量 / 中文排版 / 框架式头部 / 页脚 / 通用组件
   ========================================================= */

/* ---------- 01 设计令牌 ---------- */
:root{
  /* 色彩体系 */
  --ink-000:#071410;
  --ink-100:#0E241C;
  --ink-150:#0B1D16;
  --ink-200:#16362B;
  --mint:#35F0C8;
  --mint-d:#00BFA4;
  --orange:#FF8A3D;
  --cream:#E8EDE9;
  --grey:#9AA8A2;
  --line:#4E635B;
  --warm:#FFF4E8;

  /* 字体 */
  --font-head:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC",system-ui,-apple-system,"Segoe UI","PingFang SC",sans-serif;
  --font-data:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  /* 尺标 */
  --rail-w:88px;
  --topbar-h:64px;
  --maxw:1240px;
  --gutter:clamp(18px,4vw,44px);

  /* 动效 */
  --dur:190ms;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 02 Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--topbar-h) + 16px);
}
body,h1,h2,h3,h4,h5,p,ul,ol,dl,dd,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit}
address{font-style:normal}
table{border-collapse:collapse;width:100%}

/* ---------- 03 中文正文排版 ---------- */
body{
  padding-top:var(--topbar-h);
  padding-left:0;
  background:var(--ink-000);
  color:var(--cream);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.012em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
p{text-wrap:pretty}
p + p{margin-top:1.2em}

/* ---------- 04 标题与数据 ---------- */
.h-xl,.h-lg,.h-md,.h-sm{
  font-family:var(--font-head);
  font-weight:900;
  line-height:1.1;
  letter-spacing:-.02em;
  color:var(--cream);
}
.h-xl{font-size:clamp(42px,7.2vw,96px);line-height:1.02}
.h-lg{font-size:clamp(30px,4.6vw,64px)}
.h-md{font-size:clamp(23px,3vw,40px)}
.h-sm{font-size:clamp(18px,2vw,28px)}

.num,.data{
  font-family:var(--font-data);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1,"zero" 1;
  letter-spacing:0;
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--orange);
  line-height:1;
}
.eyebrow::before{
  content:"";
  width:20px;
  height:1px;
  background:currentColor;
  flex:none;
}

.v-note{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--grey);
  line-height:1;
}

/* ---------- 05 可访问性与焦点 ---------- */
:focus{outline:none}
:focus-visible{
  outline:2px solid var(--mint);
  outline-offset:3px;
}
.skip-link{
  position:absolute;
  top:-120px;
  left:12px;
  z-index:200;
  padding:12px 18px;
  background:var(--mint);
  color:var(--ink-000);
  font-family:var(--font-head);
  font-weight:900;
  font-size:14px;
  letter-spacing:.06em;
  text-decoration:none;
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:12px}

/* ---------- 06 布局工具 ---------- */
.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(48px,7vw,104px)}
.section--loose{padding-block:clamp(72px,10vw,160px)}

.grid{display:grid;gap:var(--gap,24px)}
.grid--12{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (min-width:720px){
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
}
@media (min-width:1024px){
  .grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
  .col-3{grid-column:span 3}
  .col-4{grid-column:span 4}
  .col-5{grid-column:span 5}
  .col-6{grid-column:span 6}
  .col-7{grid-column:span 7}
  .col-8{grid-column:span 8}
  .col-9{grid-column:span 9}
  .col-10{grid-column:span 10}
  .col-12{grid-column:span 12}
}

/* ---------- 07 通用组件 ---------- */
.card{
  position:relative;
  display:block;
  padding:clamp(20px,2.4vw,32px);
  border:1px solid var(--line);
  background:var(--ink-100);
  box-shadow:0 1px 0 rgba(0,0,0,.35);
  transition:border-color var(--dur) var(--ease),
             transform var(--dur) var(--ease),
             background-color var(--dur) var(--ease);
}
.card--link{cursor:pointer}
a.card,
.card--link:hover{
  text-decoration:none;
}
a.card:hover,
a.card:focus-visible,
.card--link:hover,
.card--link:focus-visible{
  border-color:var(--mint);
  background:var(--ink-200);
  transform:translateY(-2px);
}
.card__meta{
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--grey);
}
.card__title{
  margin-top:12px;
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(17px,1.7vw,21px);
  letter-spacing:-.01em;
  line-height:1.35;
  color:var(--cream);
}
.card__text{
  margin-top:10px;
  font-size:14.5px;
  line-height:1.8;
  color:var(--grey);
}

.tag{
  display:inline-block;
  padding:3px 9px;
  border:1px solid var(--orange);
  color:var(--orange);
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.12em;
  line-height:1.6;
  white-space:nowrap;
}
.tag--mint{border-color:var(--mint);color:var(--mint)}
.tag--plain{border-color:var(--line);color:var(--grey)}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  min-height:44px;
  padding:11px 22px;
  border:1px solid var(--mint);
  background:transparent;
  color:var(--mint);
  font-family:var(--font-head);
  font-weight:900;
  font-size:14px;
  letter-spacing:.06em;
  line-height:1.3;
  text-decoration:none;
  text-align:center;
  cursor:pointer;
  transition:background-color var(--dur) var(--ease),
             color var(--dur) var(--ease),
             border-color var(--dur) var(--ease);
}
.btn:hover,.btn:focus-visible{background:var(--mint);color:var(--ink-000)}
.btn--accent{border-color:var(--orange);color:var(--orange)}
.btn--accent:hover,.btn--accent:focus-visible{background:var(--orange);color:var(--ink-000)}
.btn--solid{background:var(--mint);color:var(--ink-000)}
.btn--solid:hover,.btn--solid:focus-visible{background:var(--mint-d);border-color:var(--mint-d);color:var(--ink-000)}
.btn--ghost{border-color:var(--line);color:var(--cream)}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--mint);background:var(--mint);color:var(--ink-000)}

.link-underline{
  position:relative;
  display:inline-block;
  color:var(--cream);
  text-decoration:none;
  transition:color var(--dur) var(--ease);
}
.link-underline::after{
  content:"";
  position:absolute;
  left:0;
  bottom:-3px;
  width:100%;
  height:1px;
  background:var(--mint);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--dur) var(--ease);
}
.link-underline:hover,.link-underline:focus-visible{color:var(--mint)}
.link-underline:hover::after,.link-underline:focus-visible::after{transform:scaleX(1)}

.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-data);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--grey);
}
.breadcrumb a{
  color:var(--grey);
  text-decoration:none;
  transition:color var(--dur) var(--ease);
}
.breadcrumb a:hover,.breadcrumb a:focus-visible{color:var(--mint)}
.breadcrumb__sep{color:var(--line)}

.tick-frame{position:relative}
.tick-frame::before,
.tick-frame::after{
  content:"";
  position:absolute;
  width:14px;
  height:14px;
  border:0 solid var(--mint);
  opacity:.45;
  pointer-events:none;
  transition:opacity var(--dur) var(--ease);
}
.tick-frame::before{top:-1px;left:-1px;border-top-width:2px;border-left-width:2px}
.tick-frame::after{bottom:-1px;right:-1px;border-bottom-width:2px;border-right-width:2px}
.tick-frame:hover::before,
.tick-frame:hover::after{opacity:.95}

/* ---------- 08 媒体容器基础 ---------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  border:1px solid var(--line);
  background:
    radial-gradient(120% 90% at 15% 0%, rgba(53,240,200,.10), transparent 62%),
    linear-gradient(180deg,#10291F,#0B1D16);
}
.media-frame::before{
  content:"";
  display:block;
  padding-top:var(--ratio,56.25%);
}
.media-frame > img,
.media-frame > video{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--ratio-4x3{--ratio:75%}
.media-frame--ratio-1x1{--ratio:100%}
.media-frame--ratio-3x4{--ratio:133.33%}
.media-frame--ratio-21x9{--ratio:42.86%}
.media-frame__cap{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  padding:14px 16px;
  background:linear-gradient(180deg,transparent,rgba(7,20,16,.92));
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--cream);
}

/* ---------- 09 框架式头部 ---------- */
.site-header{
  position:fixed;
  z-index:80;
  top:0;
  left:0;
  right:0;
  height:var(--topbar-h);
  display:flex;
  align-items:center;
  gap:12px;
  padding:0 var(--gutter);
  background:linear-gradient(180deg,#0B1E17,#071410);
  border-bottom:1px solid var(--line);
}
.site-header::after{
  content:"";
  position:absolute;
  pointer-events:none;
  opacity:.5;
  left:0;
  right:0;
  bottom:-1px;
  height:1px;
  background:repeating-linear-gradient(90deg,var(--line) 0 5px,transparent 5px 13px);
}

/* 品牌区 */
.rail-brand{
  display:flex;
  align-items:center;
  gap:10px;
  min-width:0;
}
.rail-brand__link{
  display:flex;
  align-items:center;
  gap:9px;
  color:var(--cream);
  text-decoration:none;
}
.rail-brand__mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:28px;
  height:28px;
  flex:none;
  background:var(--mint);
  color:var(--ink-000);
  font-family:var(--font-head);
  font-weight:900;
  font-size:16px;
  line-height:1;
}
.rail-brand__name{
  font-family:var(--font-head);
  font-weight:900;
  font-size:15px;
  letter-spacing:.05em;
  white-space:nowrap;
}
.rail-brand__tag{
  display:none;
  font-family:var(--font-data);
  font-size:10px;
  letter-spacing:.22em;
  color:var(--grey);
  white-space:nowrap;
}

/* 栏目切换按钮（移动端） */
.nav-toggle{
  order:3;
  display:inline-flex;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:0 14px;
  border:1px solid var(--line);
  color:var(--cream);
  font-family:var(--font-data);
  font-size:12px;
  letter-spacing:.16em;
  cursor:pointer;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.nav-toggle:hover,.nav-toggle:focus-visible{border-color:var(--mint);color:var(--mint)}
.nav-toggle__bars{
  display:inline-flex;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  width:16px;
  height:14px;
  flex:none;
}
.nav-toggle__bars i{
  display:block;
  height:1px;
  width:100%;
  background:currentColor;
  transition:transform var(--dur) var(--ease);
}
.site-header[data-open] .nav-toggle__bars i:first-child{transform:translateY(3px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars i:last-child{transform:translateY(-3px) rotate(-45deg)}

/* 导航 */
.site-nav{
  position:fixed;
  z-index:79;
  top:var(--topbar-h);
  left:0;
  right:0;
  padding:14px var(--gutter) 26px;
  background:var(--ink-100);
  border-bottom:1px solid var(--line);
  opacity:0;
  visibility:hidden;
  transform:translateY(-10px);
  transition:opacity var(--dur) var(--ease),
             transform var(--dur) var(--ease),
             visibility var(--dur) var(--ease);
}
.site-header[data-open] .site-nav{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}
.site-nav__list{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:4px;
}
.site-nav__link{
  position:relative;
  display:flex;
  align-items:center;
  min-height:46px;
  padding:8px 12px;
  border:1px solid transparent;
  color:var(--grey);
  font-family:var(--font-head);
  font-weight:900;
  font-size:14px;
  letter-spacing:.1em;
  line-height:1.3;
  text-decoration:none;
  transition:color var(--dur) var(--ease),
             background-color var(--dur) var(--ease),
             border-color var(--dur) var(--ease);
}
.site-nav__link:hover,
.site-nav__link:focus-visible{
  color:var(--ink-000);
  background:var(--mint);
  border-color:var(--mint);
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:7px;
  height:2px;
  background:var(--orange);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--dur) var(--ease);
}
.site-nav__link[aria-current="page"]{
  color:var(--orange);
  border-color:var(--line);
}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}

/* 中央快捷入口 */
.rail-entry{
  order:2;
  margin-left:auto;
  margin-right:auto;
  min-width:0;
}
.rail-entry__link{
  display:inline-flex;
  align-items:center;
  min-height:38px;
  padding:0 12px;
  border:1px solid var(--mint);
  color:var(--mint);
  font-family:var(--font-head);
  font-weight:900;
  font-size:12px;
  letter-spacing:.08em;
  line-height:1;
  text-decoration:none;
  white-space:nowrap;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.rail-entry__link:hover,.rail-entry__link:focus-visible{
  background:var(--mint);
  color:var(--ink-000);
}

.rail-cta{display:none}

/* ---------- 10 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(72px,10vw,140px);
  border-top:1px solid var(--line);
  background:var(--ink-200);
  padding-top:clamp(40px,6vw,72px);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;
  left:0;
  width:clamp(120px,22vw,260px);
  height:2px;
  background:var(--mint);
}
.footer-inner{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(28px,4vw,48px);
}
.footer-brand__mark{
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(22px,3vw,30px);
  letter-spacing:-.02em;
  line-height:1.2;
  color:var(--cream);
}
.footer-brand__slogan{
  margin-top:10px;
  font-family:var(--font-data);
  font-size:12px;
  letter-spacing:.2em;
  color:var(--mint);
}
.footer-brand__note{
  margin-top:18px;
  max-width:38ch;
  font-size:13px;
  line-height:1.9;
  color:var(--grey);
}
.footer-col__title{
  padding-bottom:10px;
  margin-bottom:16px;
  border-bottom:1px solid var(--line);
  font-family:var(--font-data);
  font-size:11px;
  font-weight:500;
  letter-spacing:.2em;
  color:var(--orange);
  line-height:1;
}
.footer-col__list{
  display:flex;
  flex-direction:column;
  gap:11px;
}
.footer-col__link{
  font-size:14px;
  color:var(--grey);
  text-decoration:none;
  transition:color var(--dur) var(--ease);
}
.footer-col__link:hover,.footer-col__link:focus-visible{color:var(--mint)}

.footer-base{
  margin-top:clamp(36px,5vw,64px);
  border-top:1px solid var(--line);
  padding-block:18px 26px;
}
.footer-base__inner{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px 24px;
  font-family:var(--font-data);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--grey);
}
.footer-base__copy{line-height:1.7}
.footer-base__links{
  display:flex;
  flex-wrap:wrap;
  gap:12px 20px;
}
.footer-base__link{
  color:var(--grey);
  text-decoration:none;
  transition:color var(--dur) var(--ease);
}
.footer-base__link:hover,.footer-base__link:focus-visible{color:var(--mint)}

/* ---------- 11 平板 ---------- */
@media (min-width:640px){
  .rail-brand__tag{display:inline-block}
  .footer-inner{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}
@media (min-width:900px){
  body{
    padding-top:0;
    padding-left:var(--rail-w);
  }
  html{scroll-padding-top:28px}
  .skip-link{left:calc(var(--rail-w) + 14px)}

  .site-header{
    top:0;
    left:0;
    right:auto;
    bottom:0;
    width:var(--rail-w);
    height:100vh;
    height:100dvh;
    flex-direction:column;
    align-items:center;
    gap:0;
    padding:24px 0 26px;
    border-bottom:0;
    border-right:1px solid var(--line);
  }
  .site-header::after{
    left:auto;
    right:-1px;
    top:0;
    bottom:0;
    width:1px;
    height:auto;
    background:repeating-linear-gradient(180deg,var(--line) 0 5px,transparent 5px 13px);
  }

  .rail-brand{
    flex-direction:column;
    gap:10px;
    width:100%;
    margin-top:auto;
    margin-bottom:30px;
    padding:0 6px;
    text-align:center;
  }
  .rail-brand__link{flex-direction:column;gap:10px}
  .rail-brand__mark{width:30px;height:30px;font-size:17px}
  .rail-brand__name{
    writing-mode:vertical-rl;
    text-orientation:mixed;
    font-size:13px;
    letter-spacing:.24em;
    line-height:1;
  }
  .rail-brand__tag{
    writing-mode:vertical-rl;
    text-orientation:mixed;
    letter-spacing:.3em;
    line-height:1;
  }

  .nav-toggle{display:none}

  .site-nav{
    position:static;
    display:block;
    width:100%;
    padding:0;
    background:transparent;
    border:0;
    opacity:1;
    visibility:visible;
    transform:none;
    margin-bottom:auto;
  }
  .site-nav__list{
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:4px;
  }
  .site-nav__link{
    display:block;
    min-height:0;
    padding:13px 9px;
    writing-mode:vertical-rl;
    text-orientation:mixed;
    font-size:13px;
    letter-spacing:.18em;
    line-height:1;
  }
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{
    background:transparent;
    border-color:var(--orange);
    color:var(--orange);
  }

  .rail-entry{
    order:0;
    margin:0 0 18px;
    width:100%;
    padding:0 8px;
    display:flex;
    justify-content:center;
  }
  .rail-entry__link{
    display:block;
    width:100%;
    min-height:0;
    padding:11px 4px;
    font-size:12px;
    line-height:1.4;
    white-space:normal;
    text-align:center;
  }

  .rail-cta{
    display:flex;
    justify-content:center;
    width:100%;
    padding:0 8px;
    margin-top:24px;
  }
  .rail-cta .btn{
    width:100%;
    min-height:0;
    padding:12px 4px;
    font-size:11px;
    letter-spacing:.05em;
    line-height:1.35;
  }
}
@media (min-width:900px) and (max-height:780px){
  .site-nav__link{font-size:12px;padding:9px 8px}
  .rail-brand__tag{display:none}
  .rail-brand{margin-bottom:18px}
}

/* ---------- 12 桌面 ---------- */
@media (min-width:1024px){
  .footer-inner{grid-template-columns:minmax(0,1.7fr) repeat(3,minmax(0,1fr))}
  .footer-brand{grid-column:auto}
  .footer-base__links{margin-left:auto}
}

/* ---------- 13 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;
    scroll-behavior:auto !important;
  }
  a.card:hover,
  a.card:focus-visible,
  .card--link:hover,
  .card--link:focus-visible{transform:none}
}