/* ============================================================
   K体育看台 · /assets/site.css
   共享外壳：reset / tokens / 中文排版 / header / footer / 通用组件
   ============================================================ */

/* ---------- 01 Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:96px;
}
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{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
button,input,select,textarea{font:inherit;color:inherit;}
button{background:none;border:0;padding:0;cursor:pointer;}
table{border-collapse:collapse;width:100%;}
[hidden]{display:none !important;}

/* ---------- 02 Tokens ---------- */
:root{
  --pitch:#12A150;
  --flag:#E8FF3A;
  --panel:#101A2E;
  --space:#070C14;
  --deep:#0A5A2C;
  --signal:#FF7A1A;
  --mute:#C9D4E2;
  --snow:#F2F6FA;
  --cold:#6B7A8F;
  --moss:#4FD08A;

  --line:rgba(201,212,226,.14);
  --line-strong:rgba(201,212,226,.3);
  --flag-soft:rgba(232,255,58,.12);
  --pitch-soft:rgba(18,161,80,.16);

  --font-sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:"IBM Plex Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --fs-note:12.5px;
  --fs-body:16px;
  --fs-lead:18px;
  --fs-h3:clamp(20px,2.4vw,26px);
  --fs-h2:clamp(28px,4.4vw,44px);
  --fs-h1:clamp(38px,6.6vw,68px);

  --gap:24px;
  --shell:min(1280px,100% - 40px);
  --rule:1px;
  --radius:2px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 03 排版基底 ---------- */
body{
  font-family:var(--font-sans);
  font-size:var(--fs-body);
  line-height:1.75;
  color:var(--snow);
  background-color:var(--space);
  background-image:
    radial-gradient(1100px 520px at 10% -6%,rgba(18,161,80,.16),transparent 68%),
    radial-gradient(820px 420px at 94% 2%,rgba(232,255,58,.055),transparent 70%),
    repeating-linear-gradient(90deg,rgba(201,212,226,.03) 0 1px,transparent 1px 88px);
  background-attachment:fixed,fixed,scroll;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
  min-height:100vh;
}
h1,h2,h3,h4{line-height:1.18;font-weight:800;letter-spacing:-.02em;}
h1{font-size:var(--fs-h1);font-weight:900;}
h2{font-size:var(--fs-h2);font-weight:900;}
h3{font-size:var(--fs-h3);font-weight:800;}
::selection{background:var(--flag);color:var(--space);}
:focus-visible{outline:2px solid var(--flag);outline-offset:3px;}
#main-content{display:block;}

/* ---------- 04 工具类 ---------- */
.shell{width:var(--shell);margin-inline:auto;}
.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  letter-spacing:.02em;
}
.visually-hidden{
  position:absolute !important;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}
.offside-rule{
  position:relative;
  height:1px;
  background:linear-gradient(90deg,transparent,rgba(201,212,226,.28) 10%,rgba(201,212,226,.28) 90%,transparent);
}
.offside-rule::after{
  content:"";
  position:absolute;
  right:9%;
  top:-4px;
  width:9px;height:9px;
  background:var(--flag);
  clip-path:polygon(0 0,100% 0,0 100%);
}

/* ---------- 05 跳转链接 ---------- */
.skip-link{
  position:absolute;
  left:16px;
  top:-72px;
  z-index:200;
  padding:10px 20px;
  background:var(--flag);
  color:var(--space);
  font-size:14px;
  font-weight:800;
  border-radius:var(--radius);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:12px;}

/* ---------- 06 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:130;
  background:rgba(7,12,20,.95);
  border-bottom:var(--rule) solid var(--line);
}
.site-header::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:1px;
  background:linear-gradient(90deg,var(--pitch) 0%,rgba(18,161,80,0) 30%,rgba(232,255,58,0) 62%,var(--flag) 100%);
  opacity:.5;
  pointer-events:none;
}
.header-inner{
  width:var(--shell);
  margin-inline:auto;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:clamp(12px,2.4vw,40px);
  min-height:74px;
  padding-block:9px;
  transition:min-height .28s var(--ease);
}
.site-header.is-collapsed .header-inner{min-height:60px;}

/* 品牌旗标 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
  padding:3px 2px;
}
.brand-flag{position:relative;width:16px;height:34px;flex:0 0 auto;}
.brand-flag::before{
  content:"";
  position:absolute;left:0;top:1px;bottom:1px;width:2px;
  background:var(--cold);opacity:.7;
}
.brand-flag::after{
  content:"";
  position:absolute;left:2px;top:2px;width:14px;height:14px;
  background:var(--flag);
  clip-path:polygon(0 0,100% 0,0 100%);
}
.brand-lockup{display:flex;flex-direction:column;line-height:1.2;}
.brand-name{
  font-size:19px;
  font-weight:900;
  letter-spacing:-.02em;
  color:var(--snow);
  transform:skewX(-5deg);
  transform-origin:left center;
}
.brand-tagline{
  font-size:11px;
  letter-spacing:.16em;
  color:var(--cold);
  font-weight:500;
  max-height:20px;
  overflow:hidden;
  transition:opacity .25s var(--ease),max-height .25s var(--ease);
}
.site-header.is-collapsed .brand-tagline{opacity:0;max-height:0;}

/* 主导航 */
.primary-nav{flex:1 1 auto;display:flex;justify-content:flex-end;min-width:0;}
.nav-list{display:flex;align-items:center;gap:clamp(0px,1.1vw,10px);}
.nav-item{display:flex;}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 11px 0 15px;
  font-size:15px;
  font-weight:600;
  color:var(--mute);
  white-space:nowrap;
  transition:color .2s var(--ease);
}
.nav-link::before{
  content:"";
  position:absolute;
  left:0;top:50%;
  width:2px;height:16px;
  background:var(--cold);
  transform:translateY(-50%);
  transition:height .22s var(--ease),background .22s var(--ease),box-shadow .22s var(--ease);
}
.nav-link:hover{color:var(--snow);}
.nav-link:hover::before{height:22px;background:var(--pitch);}
.nav-link[aria-current="page"]{color:var(--flag);}
.nav-link[aria-current="page"]::before{
  height:28px;
  background:var(--flag);
  box-shadow:0 0 12px rgba(232,255,58,.55);
}

/* 右上工具区 */
.header-utility{display:flex;align-items:center;gap:10px;flex:0 0 auto;}

.utility-search{
  display:flex;
  align-items:center;
  gap:8px;
  height:38px;
  padding:0 10px;
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  background:rgba(16,26,46,.72);
  transition:border-color .2s var(--ease);
}
.utility-search:focus-within{border-color:var(--flag);}
.utility-search-icon{
  position:relative;
  width:11px;height:11px;
  border:1.5px solid var(--cold);
  border-radius:50%;
  flex:0 0 auto;
}
.utility-search-icon::after{
  content:"";
  position:absolute;right:-5px;bottom:-4px;
  width:6px;height:1.5px;
  background:var(--cold);
  transform:rotate(45deg);
}
.utility-search-input{
  width:118px;
  border:0;
  background:transparent;
  outline:none;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.02em;
  color:var(--snow);
  min-width:0;
}
.utility-search-input::placeholder{color:var(--cold);}
.utility-search-input::-webkit-search-decoration,
.utility-search-input::-webkit-search-cancel-button{-webkit-appearance:none;appearance:none;}

.season-switch{position:relative;}
.season-toggle{
  display:inline-flex;
  align-items:center;
  gap:8px;
  height:38px;
  padding:0 12px;
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  background:rgba(16,26,46,.72);
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--mute);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.season-toggle:hover{border-color:var(--pitch);color:var(--snow);}
.season-toggle-caret{
  width:0;height:0;
  border-left:4px solid transparent;
  border-right:4px solid transparent;
  border-top:5px solid var(--flag);
  transition:transform .22s var(--ease);
}
.season-switch[data-open="true"] .season-toggle-caret{transform:rotate(180deg);}
.season-menu{
  position:absolute;
  right:0;top:calc(100% + 8px);
  min-width:172px;
  padding:6px;
  background:var(--panel);
  border:1px solid var(--line-strong);
  box-shadow:0 20px 44px rgba(0,0,0,.6);
  display:none;
  z-index:20;
}
.season-switch[data-open="true"] .season-menu{display:block;}
.season-option{
  display:block;
  width:100%;
  text-align:left;
  min-height:40px;
  padding:9px 12px;
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--mute);
  border-left:2px solid transparent;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.season-option:hover{background:var(--pitch-soft);color:var(--snow);border-left-color:var(--pitch);}
.season-option[aria-pressed="true"]{color:var(--flag);border-left-color:var(--flag);}

/* 移动菜单按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  height:38px;
  padding:0 12px;
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  background:rgba(16,26,46,.72);
  color:var(--snow);
  font-size:13px;
  font-weight:700;
  letter-spacing:.06em;
  transition:border-color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--flag);}
.nav-toggle-bars{position:relative;width:16px;height:11px;flex:0 0 auto;}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;left:0;
  width:16px;height:1.5px;
  background:var(--flag);
  transition:transform .25s var(--ease),top .25s var(--ease);
}
.nav-toggle-bars::before{top:1px;}
.nav-toggle-bars::after{top:9px;}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:5px;transform:rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:5px;transform:rotate(-45deg);}
.nav-toggle-text{font-family:var(--font-sans);}

/* 遮罩 */
.nav-scrim{
  position:fixed;
  inset:0;
  z-index:120;
  background:rgba(7,12,20,.72);
  opacity:0;
  visibility:hidden;
  transition:opacity .3s var(--ease),visibility .3s linear;
}
.nav-scrim[data-open="true"]{opacity:1;visibility:visible;}

/* ---------- 07 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,9vw,132px);
  background:var(--deep);
  color:var(--snow);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:3px;
  background:linear-gradient(90deg,var(--flag) 0 11%,rgba(232,255,58,0) 11% 100%);
  z-index:2;
}
.site-footer::after{
  content:"";
  position:absolute;
  inset:0;
  background-image:repeating-linear-gradient(90deg,rgba(255,255,255,.05) 0 1px,transparent 1px 120px);
  pointer-events:none;
}
.footer-inner{
  position:relative;
  z-index:1;
  width:var(--shell);
  margin-inline:auto;
  padding-block:clamp(44px,6vw,80px) 0;
  display:grid;
  gap:clamp(28px,3.4vw,52px);
  grid-template-columns:1.5fr .85fr .85fr 1.2fr;
}
.footer-col{min-width:0;}
.footer-brand{
  font-size:clamp(22px,3vw,30px);
  font-weight:900;
  letter-spacing:-.02em;
  color:var(--snow);
  transform:skewX(-5deg);
  transform-origin:left center;
  display:inline-block;
}
.footer-lede{
  margin-top:14px;
  font-size:14px;
  line-height:1.8;
  color:rgba(242,246,250,.82);
  max-width:34ch;
}
.footer-stamp{
  margin-top:16px;
  font-size:12.5px;
  letter-spacing:.08em;
  color:rgba(242,246,250,.66);
}
.footer-stamp .mono{color:var(--flag);font-size:15px;font-weight:700;}
.footer-col-title{
  font-size:12px;
  font-weight:700;
  letter-spacing:.26em;
  color:var(--flag);
  margin-bottom:16px;
}
.footer-links li + li{margin-top:10px;}
.footer-link{
  display:inline-block;
  font-size:14px;
  color:rgba(242,246,250,.84);
  border-bottom:1px solid transparent;
  min-height:26px;
  transition:color .2s var(--ease),border-color .2s var(--ease),padding-left .2s var(--ease);
}
.footer-link:hover{color:var(--flag);border-bottom-color:var(--flag);padding-left:6px;}
.footer-contact{font-size:14px;line-height:1.9;}
.footer-contact li + li{margin-top:10px;}
.footer-contact .mono{color:var(--flag);font-size:13.5px;word-break:break-all;}
.footer-legal{
  position:relative;
  z-index:1;
  width:var(--shell);
  margin-inline:auto;
  margin-top:clamp(32px,5vw,60px);
  padding-block:18px 26px;
  border-top:1px solid rgba(242,246,250,.2);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 28px;
  font-size:12px;
  color:rgba(242,246,250,.68);
}
.footer-copy,.footer-icp{letter-spacing:.04em;}

/* ---------- 08 通用组件 ---------- */
.section-head{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:clamp(14px,2.6vw,38px);
  align-items:start;
}
.section-index{
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(32px,6vw,70px);
  line-height:1;
  color:transparent;
  -webkit-text-stroke:1px var(--cold);
  letter-spacing:-.02em;
}
.section-title{
  font-size:var(--fs-h2);
  font-weight:900;
  letter-spacing:-.02em;
  transform:skewX(-5deg);
  transform-origin:left bottom;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:var(--fs-note);
  letter-spacing:.2em;
  color:var(--pitch);
  text-transform:uppercase;
}
.eyebrow::before{
  content:"";
  width:12px;height:12px;
  background:var(--flag);
  clip-path:polygon(0 0,100% 0,0 100%);
}
.side-note{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.28em;
  color:var(--cold);
  line-height:1;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  min-height:46px;
  padding:0 22px;
  font-size:15px;
  font-weight:700;
  letter-spacing:.02em;
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  background:transparent;
  color:var(--snow);
  transition:transform .18s var(--ease),background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.btn:hover{transform:translateX(3px);}
.btn--flag{background:var(--flag);border-color:var(--flag);color:var(--space);}
.btn--flag:hover{background:#f3ff70;border-color:#f3ff70;}
.btn--pitch{background:var(--pitch);border-color:var(--pitch);color:#04160b;}
.btn--pitch:hover{background:var(--moss);border-color:var(--moss);}
.btn--ghost:hover{border-color:var(--flag);color:var(--flag);}

.tag{
  display:inline-block;
  padding:3px 10px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  color:var(--mute);
}
.tag--flag{background:var(--flag);border-color:var(--flag);color:var(--space);font-weight:700;}
.tag--signal{border-color:var(--signal);color:var(--signal);}

.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--cold);
}
.breadcrumb li{display:flex;align-items:center;gap:10px;}
.breadcrumb li + li::before{content:"/";color:var(--line-strong);}
.breadcrumb a{color:var(--cold);transition:color .2s var(--ease);}
.breadcrumb a:hover{color:var(--flag);}
.breadcrumb [aria-current="page"]{color:var(--snow);}

.prose{max-width:68ch;font-size:16px;line-height:1.85;color:rgba(242,246,250,.9);}
.prose p + p{margin-top:1.15em;}
.prose h2,.prose h3{margin-top:2em;margin-bottom:.6em;color:var(--snow);}
.prose ul{margin-block:1.1em;}
.prose ul li{position:relative;padding-left:22px;}
.prose ul li + li{margin-top:.6em;}
.prose ul li::before{
  content:"";
  position:absolute;
  left:0;top:.78em;
  width:9px;height:1px;
  background:var(--pitch);
}
.prose strong{color:var(--flag);font-weight:800;}
.prose a{border-bottom:1px solid var(--pitch);}

.grid{display:grid;gap:var(--gap);}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr));}

/* 图片容器基础规则（页面阶段填入 <img>） */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(140deg,var(--panel),#0b1420 58%,rgba(18,161,80,.22));
  isolation:isolate;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:2;
  background-image:
    linear-gradient(rgba(232,255,58,.09) 1px,transparent 1px),
    linear-gradient(90deg,rgba(232,255,58,.09) 1px,transparent 1px);
  background-size:46px 46px;
  opacity:.6;
  pointer-events:none;
}
.media-frame__img{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame__tag{
  position:absolute;
  left:0;bottom:0;
  z-index:3;
  padding:6px 13px;
  background:var(--flag);
  color:var(--space);
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:700;
  letter-spacing:.1em;
}
.media-frame--wide{aspect-ratio:16/9;}
.media-frame--plate{aspect-ratio:4/3;}
.media-frame--portrait{aspect-ratio:3/4;}
.media-frame--strip{aspect-ratio:21/9;}

/* 滚动显现与计数 */
[data-reveal]{transition:opacity .55s var(--ease),transform .55s var(--ease);}
[data-reveal].reveal-init{opacity:0;transform:translateY(12px);}
[data-reveal].is-visible{opacity:1;transform:none;}
[data-count-to]{font-family:var(--font-mono);font-variant-numeric:tabular-nums;}

/* ---------- 09 响应式 ---------- */
@media (max-width:1280px){
  :root{--shell:min(1280px,100% - 36px);}
}
@media (max-width:1180px){
  .nav-link{padding:0 8px 0 12px;font-size:14px;}
  .utility-search-input{width:84px;}
}
@media (max-width:1080px){
  .utility-search{display:none;}
}
@media (max-width:1024px){
  .nav-toggle{display:inline-flex;}
  .primary-nav{
    position:fixed;
    top:0;right:0;bottom:0;
    width:min(340px,86vw);
    display:block;
    padding:96px 24px 40px;
    background:var(--panel);
    border-left:1px solid var(--line-strong);
    box-shadow:-32px 0 64px rgba(0,0,0,.58);
    overflow-y:auto;
    transform:translateX(101%);
    transition:transform .34s var(--ease);
    z-index:125;
  }
  .primary-nav[data-open="true"]{transform:translateX(0);}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;}
  .nav-item{display:block;}
  .nav-link{
    width:100%;
    min-height:54px;
    padding:0 4px 0 18px;
    font-size:17px;
    color:var(--snow);
    border-bottom:1px solid var(--line);
  }
  .nav-link::before{height:18px;}
  .nav-link:hover::before{height:24px;}
  .nav-link[aria-current="page"]::before{height:26px;}
  .footer-inner{grid-template-columns:1fr 1fr;}
}
@media (max-width:900px){
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr));}
}
@media (max-width:640px){
  :root{--shell:min(1280px,100% - 28px);}
  .header-inner{min-height:64px;padding-block:8px;}
  .brand-name{font-size:17px;}
  .brand-tagline{display:none;}
  .season-toggle{padding:0 10px;font-size:11.5px;}
  .nav-toggle-text{display:none;}
  .nav-toggle{padding:0 10px;}
  .footer-inner{grid-template-columns:1fr;padding-block:clamp(36px,8vw,56px) 0;}
  .footer-lede{max-width:none;}
  .footer-legal{flex-direction:column;align-items:flex-start;}
}
@media (max-width:560px){
  .grid--12{grid-template-columns:1fr;}
  .grid--12 > *{grid-column:1 / -1 !important;}
}

/* ---------- 10 降低动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
  [data-reveal],
  [data-reveal].reveal-init{opacity:1 !important;transform:none !important;}
  .btn:hover{transform:none;}
}