/* ============================================================
   B体育中国站 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   ============================================================ */

*,*::before,*::after{box-sizing:border-box}

:root{
  --ink:#080D0B;
  --deep:#10251F;
  --panel:#171B19;
  --panel-soft:#1D2421;
  --cream:#F3EFE6;
  --lime:#C9FF3F;
  --orange:#FF6B2C;
  --mist:#71E6D2;
  --violet:#8B7BFF;
  --steel:#8D9892;
  --sand:#E6C68C;

  --line:rgba(113,230,210,.14);
  --line-soft:rgba(243,239,230,.09);
  --line-strong:rgba(201,255,63,.32);
  --mesh:rgba(243,239,230,.045);

  --font-display:"HarmonyOS Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --font-serif:"Noto Serif SC","Songti SC","Source Han Serif SC",serif;

  --shell:1180px;
  --gutter:clamp(16px,4vw,40px);
  --cut:14px;
  --ease:cubic-bezier(.2,.7,.2,1);
}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  margin:0;
  background-color:var(--ink);
  background-image:
    radial-gradient(120% 70% at 82% -8%,rgba(201,255,63,.075),transparent 62%),
    radial-gradient(90% 65% at -6% 8%,rgba(113,230,210,.06),transparent 58%),
    radial-gradient(80% 60% at 50% 108%,rgba(139,123,255,.055),transparent 60%);
  color:var(--cream);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.8;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4{
  margin:0 0 .55em;
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.14;
  letter-spacing:-.02em;
  color:var(--cream);
}
h1{font-size:clamp(2rem,5.4vw,3.6rem)}
h2{font-size:clamp(1.5rem,3.2vw,2.35rem)}
h3{font-size:clamp(1.12rem,1.9vw,1.4rem)}
h4{font-size:1rem;letter-spacing:.01em}

p{margin:0 0 1.05em}
p:last-child{margin-bottom:0}
a{color:inherit;text-decoration:none}
img,svg{max-width:100%;display:block}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
strong{font-weight:700;color:var(--cream)}
::selection{background:var(--lime);color:#08130C}

:focus-visible{
  outline:2px solid var(--cream);
  outline-offset:3px;
  border-radius:4px;
}
main:focus{outline:none}

/* ---------- 工具 ---------- */
.visually-hidden{
  position:absolute;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
.container{
  width:100%;max-width:var(--shell);
  margin-inline:auto;padding-inline:var(--gutter);
}
.container--narrow{max-width:760px}

.section{position:relative;padding-block:clamp(48px,7vw,96px)}
.section--tight{padding-block:clamp(30px,4vw,56px)}
.section-head{max-width:62ch;margin-bottom:clamp(24px,3.4vw,40px)}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  margin-bottom:14px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--mist);
}
.eyebrow::before{content:"";width:24px;height:2px;background:var(--lime);display:block}

.lede{
  font-size:clamp(1rem,1.5vw,1.14rem);
  line-height:1.85;
  color:rgba(243,239,230,.78);
  max-width:64ch;
}

.quote{
  font-family:var(--font-serif);
  font-weight:500;
  font-size:clamp(1.1rem,2vw,1.5rem);
  line-height:1.75;
  color:var(--sand);
  border-left:2px solid rgba(230,198,140,.5);
  padding-left:18px;
}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}

.tactical-grid{
  position:absolute;inset:0;pointer-events:none;z-index:0;
  background-image:
    linear-gradient(90deg,var(--mesh) 1px,transparent 1px),
    linear-gradient(0deg,var(--mesh) 1px,transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:radial-gradient(120% 90% at 20% 0%,#000 0%,transparent 74%);
  mask-image:radial-gradient(120% 90% at 20% 0%,#000 0%,transparent 74%);
}

/* ---------- 按钮与标签 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:0 20px;border-radius:999px;
  border:1px solid transparent;
  font-family:var(--font-body);font-size:14px;font-weight:700;letter-spacing:.04em;
  white-space:nowrap;cursor:pointer;
  transition:transform .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn-lime{background:var(--lime);color:#08130C}
.btn-lime:hover{box-shadow:0 10px 26px -10px rgba(201,255,63,.65)}
.btn-ghost{background:rgba(243,239,230,.04);border-color:rgba(243,239,230,.18);color:var(--cream)}
.btn-ghost:hover{background:rgba(201,255,63,.12);border-color:var(--line-strong);color:var(--lime)}
.btn-orange{background:var(--orange);color:#160703}
.btn-orange:hover{box-shadow:0 10px 26px -10px rgba(255,107,44,.6)}
.btn-outline{border-color:var(--line-strong);color:var(--lime);background:transparent}
.btn-outline:hover{background:rgba(201,255,63,.1)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  min-height:26px;padding:3px 11px;border-radius:999px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--mist);background:rgba(113,230,210,.08);border:1px solid var(--line);
}
.tag--lime{color:#08130C;background:var(--lime);border-color:transparent}
.tag--orange{color:#160703;background:var(--orange);border-color:transparent}

/* ---------- 面板与数据 ---------- */
.panel{
  position:relative;
  padding:clamp(18px,3vw,28px);
  background:linear-gradient(158deg,rgba(23,27,25,.97),rgba(16,37,31,.92));
  border:1px solid var(--line);
  border-radius:var(--cut);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,0 100%);
}
.panel > *{position:relative;z-index:1}
.panel--edge::before{
  content:"";position:absolute;left:0;top:18px;bottom:18px;width:3px;
  background:linear-gradient(180deg,var(--lime),rgba(201,255,63,0));
  border-radius:3px;
}

.data-readout{display:flex;align-items:baseline;gap:10px;font-family:var(--font-mono)}
.data-value{
  font-family:var(--font-mono);font-weight:700;
  font-size:clamp(2.3rem,6vw,3.8rem);line-height:.95;letter-spacing:-.04em;
  color:var(--lime);
}
.data-value--orange{color:var(--orange)}
.data-value--mist{color:var(--mist)}
.data-unit{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--steel);
}

/* ---------- 面包屑 ---------- */
.breadcrumb{padding-block:20px 0}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--steel)}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"/";color:rgba(141,152,146,.5)}
.breadcrumb a{color:var(--steel);border-bottom:1px solid transparent;transition:color .18s,border-color .18s}
.breadcrumb a:hover{color:var(--lime);border-color:var(--line-strong)}
.breadcrumb [aria-current="page"]{color:var(--cream)}

/* ---------- 图片容器基础 ---------- */
.media-frame{
  position:relative;display:block;overflow:hidden;width:100%;
  border-radius:var(--cut);
  border:1px solid var(--line);
  background-color:var(--deep);
  background-image:
    linear-gradient(155deg,rgba(16,37,31,.94),rgba(8,13,11,.97)),
    repeating-linear-gradient(90deg,rgba(243,239,230,.07) 0 1px,transparent 1px 46px),
    repeating-linear-gradient(0deg,rgba(243,239,230,.055) 0 1px,transparent 1px 46px);
}
.media-frame img{width:100%;height:100%;object-fit:cover;display:block}
.media-frame--hero{aspect-ratio:16/9}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--portrait{aspect-ratio:4/5}
.media-frame__label{
  position:absolute;left:14px;bottom:14px;
  padding:6px 10px;border-radius:4px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--mist);background:rgba(8,13,11,.72);border:1px solid var(--line);
}

/* ---------- 分段标签页 ---------- */
.tabs{position:relative}
.tablist{
  display:inline-flex;flex-wrap:wrap;gap:4px;max-width:100%;
  padding:6px;border-radius:999px;
  border:1px solid var(--line);
  background:rgba(16,37,31,.62);
}
.tab{
  min-height:44px;padding:0 18px;border-radius:999px;
  font-size:14px;letter-spacing:.04em;
  color:rgba(243,239,230,.66);
  transition:background-color .18s var(--ease),color .18s var(--ease);
}
.tab:hover{color:var(--cream);background:rgba(243,239,230,.06)}
.tab[aria-selected="true"]{background:var(--lime);color:#08130C;font-weight:700}
.tabpanel{padding-top:clamp(20px,3vw,32px);outline:none}
.tabpanel[hidden],[data-tab-panel][hidden]{display:none}

/* ---------- 显现动效 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(18px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}
[data-reveal].is-revealed{opacity:1;transform:none}

/* ============================================================
   头部
   ============================================================ */
.skip-link{
  position:absolute;top:-80px;left:16px;z-index:200;
  padding:10px 18px;border-radius:8px;
  background:var(--lime);color:#08130C;
  font-size:14px;font-weight:700;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:12px}

.site-header{
  position:sticky;top:0;z-index:120;
  padding:14px var(--gutter) 0;
  background:transparent;
}

.header-shell{
  position:relative;
  display:flex;align-items:center;gap:clamp(8px,1.5vw,20px);
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding:10px 12px 10px 18px;
  border-radius:999px;
  border:1px solid rgba(201,255,63,.14);
  background:linear-gradient(120deg,rgba(16,37,31,.93),rgba(23,27,25,.87));
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
  box-shadow:0 22px 44px -30px rgba(0,0,0,.95),inset 0 1px 0 rgba(243,239,230,.06);
}

.brand{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto;min-height:44px}
.brand-mark{
  position:relative;display:grid;place-items:center;
  width:32px;height:32px;border-radius:10px;
  background:linear-gradient(150deg,var(--lime),#8FDC1F);
  color:#08130C;flex:0 0 auto;
}
.brand-mark::before{
  content:"";width:13px;height:13px;border:2.5px solid #08130C;border-radius:2px;
  transform:rotate(45deg);
}
.brand-pulse{
  position:absolute;inset:-6px;border-radius:15px;
  border:1px solid rgba(201,255,63,.45);
  animation:brandPulse 3.6s var(--ease) infinite;
  pointer-events:none;
}
@keyframes brandPulse{
  0%,100%{opacity:.18;transform:scale(.92)}
  50%{opacity:.65;transform:scale(1)}
}
.brand-text{display:flex;flex-direction:column;line-height:1.05}
.brand-name{font-family:var(--font-display);font-weight:900;font-size:17px;letter-spacing:.02em;color:var(--cream)}
.brand-tag{
  margin-top:3px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--mist);
}

.nav-capsule{flex:1 1 auto;display:flex;justify-content:center;min-width:0}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{
  position:relative;display:inline-flex;align-items:center;
  min-height:44px;padding:0 clamp(8px,1.1vw,14px);
  border-radius:999px;
  font-size:14px;letter-spacing:.06em;
  color:rgba(243,239,230,.72);
  transition:color .18s var(--ease),background-color .18s var(--ease),text-shadow .18s var(--ease);
}
.nav-link:hover{color:var(--lime);background:rgba(201,255,63,.08);text-shadow:0 0 16px rgba(201,255,63,.45)}
.nav-link[aria-current="page"]{color:var(--lime)}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:50%;bottom:6px;
  width:16px;height:2px;margin-left:-8px;border-radius:2px;
  background:var(--lime);box-shadow:0 0 10px rgba(201,255,63,.9);
}
.nav-extras{display:none}

.header-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.nav-toggle{
  display:none;align-items:center;justify-content:center;gap:8px;
  min-height:44px;min-width:44px;padding:0 12px;
  border-radius:999px;border:1px solid rgba(243,239,230,.2);
  color:var(--cream);
  transition:border-color .18s var(--ease),color .18s var(--ease),background-color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--line-strong);color:var(--lime)}
.nav-toggle-bars{
  width:20px;height:14px;
  background-image:
    linear-gradient(currentColor,currentColor),
    linear-gradient(currentColor,currentColor),
    linear-gradient(currentColor,currentColor);
  background-size:100% 2px,100% 2px,100% 2px;
  background-position:top center,center center,bottom center;
  background-repeat:no-repeat;
  transition:transform .22s var(--ease),color .18s var(--ease);
}
.nav-toggle-text{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em}

.scroll-progress{
  position:absolute;left:22px;right:22px;bottom:3px;height:2px;
  border-radius:2px;background:rgba(243,239,230,.08);overflow:hidden;
}
.scroll-progress-bar{
  display:block;width:100%;height:100%;border-radius:2px;
  transform:scaleX(0);transform-origin:left center;
  background:linear-gradient(90deg,var(--mist),var(--lime));
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(48px,8vw,110px);
  border-top:1px solid rgba(201,255,63,.18);
  background:linear-gradient(180deg,#0B1512 0%,#07100D 55%,#050A08 100%);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;
  width:clamp(140px,28vw,360px);height:2px;
  background:linear-gradient(90deg,var(--lime),rgba(201,255,63,0));
  box-shadow:0 0 24px rgba(201,255,63,.45);
}
.footer-mesh{
  position:absolute;inset:0;pointer-events:none;opacity:.55;
  background-image:
    linear-gradient(90deg,rgba(243,239,230,.05) 1px,transparent 1px),
    linear-gradient(0deg,rgba(243,239,230,.04) 1px,transparent 1px);
  background-size:72px 72px;
  -webkit-mask-image:radial-gradient(120% 90% at 18% 0%,#000 0%,transparent 74%);
  mask-image:radial-gradient(120% 90% at 18% 0%,#000 0%,transparent 74%);
}

.footer-inner{
  position:relative;
  display:grid;grid-template-columns:1.35fr 1.5fr 1.15fr;
  gap:clamp(24px,4vw,56px);
  max-width:var(--shell);margin-inline:auto;
  padding:clamp(40px,6vw,72px) var(--gutter) clamp(28px,4vw,44px);
}

.footer-lead{display:flex;flex-direction:column;align-items:flex-start}
.brand-footer .brand-name{font-size:19px}
.footer-summary{
  margin-top:18px;max-width:34ch;
  font-size:15px;line-height:1.85;color:rgba(243,239,230,.72);
}
.footer-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}

.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(14px,2vw,26px)}
.footer-col-title{
  margin:0 0 12px;
  font-family:var(--font-mono);font-weight:500;
  font-size:11px;letter-spacing:.22em;text-transform:uppercase;
  color:rgba(141,152,146,.92);
}
.footer-links{display:flex;flex-direction:column;gap:0}
.footer-link{
  display:inline-flex;align-items:center;min-height:40px;
  font-size:14px;color:rgba(243,239,230,.76);
  transition:color .18s var(--ease),transform .18s var(--ease);
}
.footer-link:hover{color:var(--lime);transform:translateX(3px)}

.footer-contact{display:flex;flex-direction:column;gap:14px}
.contact-line{display:flex;flex-direction:column;gap:2px;margin:0}
.contact-label{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;
  text-transform:uppercase;color:rgba(141,152,146,.85);
}
.contact-value{font-size:14px;line-height:1.7;color:var(--cream);word-break:break-word}
.contact-note{
  margin:0;font-size:12.5px;line-height:1.75;
  color:rgba(141,152,146,.92);
  border-left:2px solid rgba(255,107,44,.55);
  padding-left:12px;
}

.footer-base{
  position:relative;
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 20px;
  max-width:var(--shell);margin-inline:auto;
  padding:16px var(--gutter) calc(26px + env(safe-area-inset-bottom,0px));
  border-top:1px solid rgba(243,239,230,.08);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--steel);
}
.footer-signal{display:inline-flex;align-items:center;gap:8px;color:var(--mist)}
.footer-signal::before{
  content:"";width:6px;height:6px;border-radius:50%;
  background:var(--lime);box-shadow:0 0 10px rgba(201,255,63,.9);
}
.footer-base-meta{display:inline-flex;flex-wrap:wrap;align-items:center;gap:6px 16px}
.footer-icp{color:rgba(141,152,146,.9)}
.footer-legal-link{
  color:var(--steel);
  border-bottom:1px solid rgba(141,152,146,.32);
  padding-bottom:1px;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-legal-link:hover{color:var(--lime);border-color:var(--lime)}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1200px){
  .nav-link{font-size:13px;padding-inline:9px}
  .header-actions .btn-ghost{display:none}
}

@media (max-width:1023px){
  .header-shell{padding:8px 8px 8px 14px;gap:8px}
  .header-actions .btn{display:none}
  .nav-toggle{display:inline-flex}

  .nav-capsule{
    position:fixed;top:0;right:0;bottom:0;z-index:130;
    width:min(88vw,340px);
    display:flex;flex-direction:column;justify-content:flex-start;align-items:stretch;
    gap:4px;
    padding:calc(env(safe-area-inset-top,0px) + 82px) 20px calc(env(safe-area-inset-bottom,0px) + 28px);
    background:linear-gradient(180deg,#10251F 0%,#0B1512 62%,#080D0B 100%);
    border-left:1px solid rgba(201,255,63,.22);
    box-shadow:-34px 0 60px -34px rgba(0,0,0,.95);
    transform:translateX(101%);
    visibility:hidden;
    overflow-y:auto;
    transition:transform .34s var(--ease),visibility .34s var(--ease);
  }
  .site-header[data-open] .nav-capsule{transform:none;visibility:visible}
  .site-header[data-open]::before{
    content:"";position:fixed;inset:0;z-index:125;
    background:rgba(4,8,6,.72);
    -webkit-backdrop-filter:blur(3px);
    backdrop-filter:blur(3px);
  }
  .site-header[data-open] .nav-toggle{border-color:var(--lime);color:var(--lime)}
  .site-header[data-open] .nav-toggle-bars{transform:rotate(90deg)}

  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-link{
    min-height:52px;padding:0 14px;font-size:15px;border-radius:12px;
    border-bottom:1px solid rgba(243,239,230,.06);
  }
  .nav-link[aria-current="page"]::after{
    left:0;top:50%;bottom:auto;margin:-9px 0 0 0;
    width:2px;height:18px;
  }
  .nav-extras{
    display:flex;flex-direction:column;gap:8px;
    margin-top:18px;padding-top:18px;
    border-top:1px solid rgba(243,239,230,.1);
  }
  .nav-extra{
    display:flex;align-items:center;justify-content:space-between;
    min-height:44px;padding:0 14px;border-radius:12px;
    font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;
    color:var(--mist);background:rgba(113,230,210,.07);border:1px solid var(--line);
  }
  .nav-extra::after{content:"→"}

  html.nav-open{overflow:hidden}
  body{overflow-x:hidden}
}

@media (max-width:960px){
  .footer-inner{grid-template-columns:1fr 1fr}
  .footer-contact{grid-column:1 / -1}
}

@media (max-width:860px){
  .grid-2,.grid-3{grid-template-columns:1fr}
}

@media (max-width:640px){
  .brand-tag{display:none}
  .brand-name{font-size:16px}
  .scroll-progress{left:18px;right:18px}
  .footer-inner{grid-template-columns:1fr;gap:32px}
  .footer-cols{grid-template-columns:1fr 1fr}
  .footer-base{font-size:11px}
  .media-frame--hero{aspect-ratio:4/3}
  .media-frame--wide{aspect-ratio:16/9}
  .tablist{width:100%;justify-content:flex-start}
}

@media (max-width:400px){
  .nav-toggle-text{display:none}
}

@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]{opacity:1 !important;transform:none !important}
  .btn:hover{transform:none}
  .footer-link:hover{transform:none}
}