/* ==========================================================================
   BSPORTS看台 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 报头 / 页脚 / 按钮 / 网格 / 基础组件
   ========================================================================== */

/* ---------- 变量 ---------- */
:root{
  /* 色彩：深空蓝基底占大面积，荧光青管当前状态，信号橙管需要动手 */
  --bg:#050B1F;
  --bg-stand:#0A1428;
  --panel:#12224A;
  --line:#1E3566;
  --cyan:#19F0D0;
  --cyan-soft:#7FFBE8;
  --orange:#FF6A2B;
  --orange-soft:#FFA270;
  --ice:#EAF2FF;
  --muted:#8FA3C8;
  --grass:#35D07F;
  --ink:#04121A;

  /* 字体 */
  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-cond:"Barlow Condensed","Oswald","Noto Sans SC","PingFang SC",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","SF Mono",ui-monospace,Menlo,Consolas,monospace;

  /* 字号阶梯 12 / 15 / 17 / 22 / 30 / 44 / 64 */
  --fs-12:0.75rem;
  --fs-15:0.9375rem;
  --fs-17:1.0625rem;
  --fs-22:1.375rem;
  --fs-30:1.875rem;
  --fs-44:clamp(1.75rem,3.6vw,2.75rem);
  --fs-64:clamp(2.125rem,6vw,4rem);

  /* 结构 */
  --wrap:1200px;
  --gutter:20px;
  --gap:24px;
  --rail:56px;
  --lh-body:1.75;
  --ease:cubic-bezier(.22,.68,.24,1);
  --t-fast:.16s var(--ease);
  --t-med:.32s var(--ease);
}
@media (min-width:768px){:root{--gutter:32px;--gap:32px}}
@media (min-width:1200px){:root{--gutter:40px}}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background-color:var(--bg);
  color:var(--ice);
  font-family:var(--font-body);
  font-size:1rem;
  font-weight:400;
  line-height:var(--lh-body);
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4,h5{margin:0;font-family:var(--font-display);font-weight:900;line-height:1.15;letter-spacing:-.02em}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
hr{border:0;height:1px;background:var(--line);margin:0}
a{color:var(--cyan);text-decoration:none}
a:hover{color:var(--cyan-soft)}
::selection{background:var(--cyan);color:var(--ink)}

/* 夜场看台底纹：冷光晕 + 暖光晕 + 极淡对角网格 */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    radial-gradient(90% 55% at 12% -8%,rgba(25,240,208,.10),transparent 62%),
    radial-gradient(70% 45% at 102% -2%,rgba(255,106,43,.09),transparent 58%),
    repeating-linear-gradient(90deg,rgba(30,53,102,.34) 0 1px,transparent 1px 96px),
    repeating-linear-gradient(0deg,rgba(30,53,102,.26) 0 1px,transparent 1px 96px);
}
#main-content,.site-main{position:relative;z-index:1}

/* ---------- 焦点 ---------- */
:focus{outline:none}
:focus-visible{outline:2px solid var(--cyan-soft);outline-offset:3px}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:-72px;
  left:16px;
  z-index:200;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 18px;
  background:var(--cyan);
  color:var(--ink);
  font-size:var(--fs-15);
  font-weight:700;
  letter-spacing:.04em;
  transition:top var(--t-fast);
}
.skip-link:focus{top:16px;color:var(--ink)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:0 18px;
  border:1px solid transparent;
  background:transparent;
  color:var(--ice);
  font-family:var(--font-body);
  font-size:var(--fs-15);
  font-weight:500;
  letter-spacing:.03em;
  white-space:nowrap;
  cursor:pointer;
  transition:background-color var(--t-fast),color var(--t-fast),border-color var(--t-fast);
}
.btn--primary{background:var(--cyan);border-color:var(--cyan);color:var(--ink);font-weight:700}
.btn--primary:hover,.btn--primary:focus-visible{background:var(--orange);border-color:var(--orange);color:#1A0700}
.btn--ghost{border-color:var(--line);color:var(--muted)}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--orange);color:var(--orange-soft)}

/* ---------- 报头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:linear-gradient(180deg,rgba(10,20,40,.98),rgba(5,11,31,.95));
  border-bottom:1px solid var(--line);
}
.site-header::after{
  content:"";
  display:block;
  height:2px;
  background:linear-gradient(90deg,var(--cyan),rgba(25,240,208,0) 40%,rgba(255,106,43,0) 60%,var(--orange));
}
.masthead{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:12px;
  max-width:var(--wrap);
  margin-inline:auto;
  padding:16px var(--gutter) 10px;
}
.masthead__brand{grid-column:2;text-align:center;min-width:0}
.brand{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(1.25rem,2.4vw,1.75rem);
  letter-spacing:-.02em;
  line-height:1.1;
  color:var(--ice);
}
.brand:hover{color:var(--cyan-soft)}
.brand__mark{
  width:9px;
  height:9px;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(25,240,208,.16);
  flex:0 0 auto;
}
.brand__tagline{
  margin-top:5px;
  font-size:var(--fs-12);
  letter-spacing:.24em;
  color:var(--muted);
}
.masthead__actions{
  grid-column:3;
  justify-self:end;
  display:flex;
  align-items:center;
  gap:8px;
}
.site-nav{
  border-top:1px solid var(--line);
  background:rgba(10,20,40,.55);
}
.site-nav__list{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  align-items:stretch;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
  counter-reset:navi;
}
.site-nav__item{display:flex;align-items:center;counter-increment:navi}
.site-nav__item + .site-nav__item::before{
  content:"";
  display:block;
  width:1px;
  height:14px;
  background:var(--line);
}
.site-nav__link{
  display:inline-flex;
  align-items:center;
  min-height:46px;
  padding:0 18px;
  font-size:var(--fs-15);
  color:var(--muted);
  border-bottom:2px solid transparent;
  transition:color var(--t-fast),border-color var(--t-fast),background-color var(--t-fast);
}
.site-nav__link:hover{color:var(--ice);background:rgba(18,34,74,.5)}
.site-nav__link[aria-current="page"]{
  color:var(--cyan);
  border-bottom-color:var(--cyan);
  text-decoration:underline;
  text-decoration-thickness:1px;
  text-underline-offset:7px;
}
.nav-toggle{
  display:none;
  grid-column:3;
  justify-self:end;
  align-items:center;
  gap:9px;
  min-width:44px;
  min-height:44px;
  padding:0 12px;
  background:transparent;
  border:1px solid var(--line);
  color:var(--ice);
  font-size:var(--fs-12);
  letter-spacing:.1em;
  cursor:pointer;
  transition:border-color var(--t-fast),color var(--t-fast);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.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;
  right:0;
  height:1px;
  background:var(--cyan);
  transition:transform var(--t-fast),background-color var(--t-fast);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(4.5px) rotate(45deg);background:var(--orange)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-4.5px) rotate(-45deg);background:var(--orange)}

/* 报头滚动收束（桌面） */
@media (min-width:901px){
  .site-header[data-compact] .masthead{
    grid-template-columns:auto 1fr auto;
    padding-block:8px;
  }
  .site-header[data-compact] .masthead__brand{grid-column:1;text-align:left}
  .site-header[data-compact] .brand{font-size:var(--fs-17)}
  .site-header[data-compact] .brand__tagline{display:none}
}

/* 页脚 ---------- */
.site-footer{
  position:relative;
  z-index:1;
  margin-top:64px;
  background:var(--bg-stand);
  border-top:1px solid var(--line);
  color:var(--muted);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:2px;
  background:linear-gradient(90deg,var(--orange),rgba(255,106,43,0) 34%,rgba(25,240,208,0) 66%,var(--cyan));
}
.footer__inner{
  max-width:var(--wrap);
  margin-inline:auto;
  padding:48px var(--gutter) 32px;
}
.footer__top{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.3fr;
  gap:32px;
}
.footer__brand-mark{
  display:inline-block;
  font-family:var(--font-display);
  font-weight:900;
  font-size:var(--fs-22);
  letter-spacing:-.02em;
  color:var(--ice);
}
.footer__brand-mark:hover{color:var(--cyan-soft)}
.footer__tagline{
  margin-top:8px;
  font-size:var(--fs-12);
  letter-spacing:.2em;
  color:var(--cyan);
}
.footer__kicker{
  margin-top:14px;
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  line-height:1.9;
  color:var(--muted);
}
.footer__col-title{
  margin-bottom:12px;
  font-family:var(--font-cond);
  font-size:var(--fs-12);
  font-weight:700;
  letter-spacing:.22em;
  color:var(--ice);
}
.footer__col-title::after{
  content:"";
  display:block;
  width:24px;
  height:1px;
  margin-top:9px;
  background:var(--cyan);
}
.footer__list{display:grid;gap:2px}
.footer__link{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  font-size:var(--fs-15);
  color:var(--muted);
  transition:color var(--t-fast);
}
.footer__link:hover{color:var(--cyan-soft);text-decoration:underline;text-underline-offset:6px}
.footer__list--plain{display:block}
.footer__line{
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  line-height:1.95;
  color:var(--muted);
  overflow-wrap:anywhere;
  padding-block:6px;
}
.footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:10px 24px;
  margin-top:40px;
  padding-top:20px;
  border-top:1px solid var(--line);
}
.footer__copyright{font-size:var(--fs-15);color:var(--ice)}
.footer__legal{font-family:var(--font-mono);font-size:var(--fs-12);color:var(--muted);letter-spacing:.04em}
.footer__note{
  margin-top:14px;
  font-size:var(--fs-12);
  line-height:1.9;
  color:var(--muted);
}

/* ---------- 通用容器与网格 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{
  padding-block:56px;
  border-top:1px solid var(--line);
}
.section--flush{border-top:0;padding-top:32px}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px;
  margin-bottom:28px;
}
.eyebrow{
  display:block;
  margin-bottom:10px;
  font-family:var(--font-cond);
  font-size:var(--fs-12);
  font-weight:700;
  letter-spacing:.26em;
  color:var(--cyan);
}
.section-title{
  font-family:var(--font-display);
  font-weight:900;
  font-size:var(--fs-30);
  letter-spacing:-.02em;
  color:var(--ice);
}
.display{font-size:var(--fs-64);line-height:1.05;letter-spacing:-.03em}
.lead{
  max-width:38em;
  font-size:var(--fs-17);
  line-height:1.75;
  color:var(--muted);
}
.grid{display:grid;gap:var(--gap)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.span-2{grid-column:span 2}
.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-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-9{grid-column:span 9}
.span-10{grid-column:span 10}
.span-12{grid-column:span 12}
.rule{height:1px;background:var(--line);border:0;margin:0}

/* ---------- 基础组件 ---------- */
.panel{
  background:var(--panel);
  border:1px solid var(--line);
  padding:20px;
}
.panel__head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:10px 16px;
  padding-bottom:12px;
  margin-bottom:16px;
  border-bottom:1px solid var(--line);
}
.panel__title{
  font-family:var(--font-display);
  font-size:var(--fs-17);
  font-weight:900;
  color:var(--ice);
}
.tag{
  display:inline-flex;
  align-items:center;
  min-height:24px;
  padding:0 9px;
  border:1px solid currentColor;
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.08em;
  color:var(--cyan);
}
.tag--orange{color:var(--orange)}
.tag--grass{color:var(--grass)}
.tag--muted{color:var(--muted)}
.stat{display:grid;gap:2px}
.stat__value{
  font-family:var(--font-mono);
  font-size:var(--fs-22);
  line-height:1.1;
  color:var(--ice);
}
.stat__label{font-size:var(--fs-12);color:var(--muted)}
.meta{
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.04em;
  color:var(--muted);
}
.annot{
  font-size:var(--fs-12);
  letter-spacing:.18em;
  color:var(--muted);
}
.annot--vertical{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  letter-spacing:.3em;
}
.annot--rotate{
  display:inline-block;
  transform:rotate(-90deg);
  transform-origin:left bottom;
  white-space:nowrap;
}
.index-list{border-top:1px solid var(--line)}
.index-list__item{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:baseline;
  gap:8px 18px;
  padding:15px 0;
  border-bottom:1px solid var(--line);
}
.index-list__num{
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  color:var(--cyan);
}
.index-list__title{
  font-family:var(--font-display);
  font-size:var(--fs-17);
  font-weight:900;
  color:var(--ice);
}
.breadcrumb{
  padding-block:14px;
  font-size:var(--fs-12);
  color:var(--muted);
}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__list li{display:flex;align-items:center}
.breadcrumb__list li + li::before{content:"/";margin-right:8px;color:var(--line)}
.breadcrumb a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  color:var(--muted);
}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--ice)}

/* ---------- 图片容器基础规则 ---------- */
.media{
  position:relative;
  display:block;
  aspect-ratio:16 / 9;
  background:var(--panel);
  border:1px solid var(--line);
  overflow:hidden;
}
.media > img{width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:3 / 4}
.media--square{aspect-ratio:1 / 1}
.media__ph{
  position:absolute;
  inset:0;
  display:grid;
  place-items:center;
  padding:12px;
  text-align:center;
  background-image:repeating-linear-gradient(135deg,rgba(30,53,102,.9) 0 1px,transparent 1px 12px);
  color:var(--muted);
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.14em;
}
.media__caption{
  position:absolute;
  left:0;
  bottom:0;
  max-width:80%;
  padding:6px 10px;
  background:rgba(5,11,31,.86);
  border-top:1px solid var(--line);
  border-right:1px solid var(--line);
  font-size:var(--fs-12);
  color:var(--ice);
}
.media__tag{
  position:absolute;
  right:0;
  bottom:0;
  padding:6px 10px;
  background:rgba(25,240,208,.12);
  border-top:1px solid var(--cyan);
  border-left:1px solid var(--cyan);
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.1em;
  color:var(--cyan);
}

/* ---------- 滚动显现 ---------- */
[data-reveal]{
  transition:opacity .52s var(--ease),transform .52s var(--ease);
  transition-delay:calc(var(--reveal-i,0) * 70ms);
}
.js [data-reveal]:not(.is-visible){opacity:0;transform:translateY(16px)}

/* ---------- 响应式：报头 / 页脚 ---------- */
@media (max-width:1024px){
  .footer__top{grid-template-columns:1fr 1fr;gap:28px}
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  body.is-nav-open{overflow:hidden}
  .masthead{
    grid-template-columns:1fr auto auto;
    gap:8px;
    padding:10px var(--gutter) 8px;
  }
  .masthead__brand{grid-column:1;text-align:left}
  .brand{font-size:1.125rem}
  .brand__tagline{margin-top:3px;font-size:.625rem;letter-spacing:.14em}
  .masthead__actions{grid-column:2;justify-self:end}
  .masthead__actions .btn--ghost{display:none}
  .masthead__actions .btn{padding:0 12px;font-size:var(--fs-12)}
  .nav-toggle{display:inline-flex}
  .site-nav{
    display:none;
    border-top:1px solid var(--line);
    background:rgba(5,11,31,.98);
  }
  .site-nav[data-open]{
    display:block;
    animation:nav-drop .24s var(--ease);
  }
  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    padding:8px var(--gutter) 18px;
  }
  .site-nav__item + .site-nav__item::before{display:none}
  .site-nav__link{
    width:100%;
    justify-content:space-between;
    min-height:52px;
    padding:0 4px;
    border-bottom:1px solid var(--line);
    color:var(--ice);
  }
  .site-nav__link::after{
    content:counter(navi,decimal-leading-zero);
    font-family:var(--font-mono);
    font-size:var(--fs-12);
    color:var(--muted);
    margin-left:12px;
  }
  .site-nav__link[aria-current="page"]{text-decoration:none}
  .section{padding-block:40px}
}
@keyframes nav-drop{
  from{opacity:0;transform:translateY(-8px)}
  to{opacity:1;transform:none}
}
@media (max-width:720px){
  .grid--12,.grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .span-2,.span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-9,.span-10{grid-column:span 1}
  .section__head{margin-bottom:20px}
}
@media (max-width:560px){
  .footer__top{grid-template-columns:1fr;gap:24px}
  .footer__inner{padding-top:36px}
  .footer__bottom{flex-direction:column;align-items:flex-start}
}
@media (max-width:400px){
  .nav-toggle__label{display:none}
  .nav-toggle{padding:0 10px}
}

/* ---------- 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;
  }
  [data-reveal]{transition:none;transition-delay:0ms}
  .js [data-reveal]:not(.is-visible){opacity:1;transform:none}
}