/* ==========================================================================
   博万体育 · 共享样式 /assets/site.css
   顺序：reset → tokens → 基础排版 → 布局容器 → 通用组件 → 头部 → 页脚 → 响应式
   ========================================================================== */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,li,figure,figcaption,blockquote,dl,dd{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;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ---------- tokens ---------- */
:root{
  --ink:#05100C;
  --ink-2:#0B1411;
  --panel:#13211C;
  --line:#24352D;
  --text:#E9F5EF;
  --dim:#A3B8AE;
  --cyan:#3BF0C0;
  --amber:#FFA83D;
  --teal:#0F3B31;
  --coral:#FF6F5E;
  --paper:#F1F6F3;
  --font-display:"Barlow Condensed","Oswald","Noto Sans SC","Source Han Sans SC","PingFang SC",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --max:1240px;
  --gutter:clamp(16px,4vw,40px);
  --t:160ms;
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- 基础排版 ---------- */
body{
  background-color:var(--ink);
  background-image:radial-gradient(120% 80% at 88% -10%,rgba(59,240,192,.07),transparent 58%),
                   radial-gradient(90% 70% at 0% 108%,rgba(255,168,61,.05),transparent 52%);
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.08;letter-spacing:-.01em}
h1{font-size:clamp(40px,6.6vw,76px)}
h2{font-size:clamp(28px,3.4vw,40px)}
h3{font-size:clamp(20px,2vw,24px);font-weight:700}
h4{font-size:18px;font-weight:700}
small{font-size:13px}
strong{font-weight:700;color:var(--text)}

a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible,
label:focus-visible,
[tabindex]:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:1px;
}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-88px;
  z-index:120;
  padding:10px 18px;
  background:var(--cyan);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.08em;
  transition:top var(--t) var(--ease);
}
.skip-link:focus{top:10px}

/* ---------- 布局容器 ---------- */
.shell{width:100%;max-width:var(--max);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(40px,6vw,84px)}
.section--tight{padding-block:clamp(26px,4vw,48px)}
.section--alt{background:var(--ink-2);border-block:1px solid var(--line)}
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:14px 32px;
  margin-bottom:clamp(20px,3vw,36px);
}
.section-title{font-size:clamp(26px,3vw,36px)}
.lede{max-width:60ch;color:var(--dim);font-size:clamp(15px,1.4vw,17px);line-height:1.8}
.muted{color:var(--dim)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{content:"";width:20px;height:1px;background:currentColor}
.divider{height:1px;border:0;background:var(--line);margin-block:clamp(24px,3vw,40px)}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(14px,2vw,28px)}
.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-12{grid-column:span 12}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:11px 20px;
  border:1px solid var(--line);
  background:transparent;
  color:var(--text);
  font-family:var(--font-body);
  font-size:15px;
  font-weight:500;
  line-height:1.2;
  transition:border-color var(--t) var(--ease),
             color var(--t) var(--ease),
             background-color var(--t) var(--ease),
             transform var(--t) var(--ease);
}
.btn:hover{border-color:var(--cyan);color:var(--cyan);transform:translateX(4px)}
.btn--cyan{background:var(--cyan);border-color:var(--cyan);color:var(--ink);font-weight:700}
.btn--cyan:hover{background:var(--amber);border-color:var(--amber);color:var(--ink)}
.btn--amber{background:var(--amber);border-color:var(--amber);color:var(--ink);font-weight:700}
.btn--amber:hover{background:transparent;border-color:var(--amber);color:var(--amber)}

/* ---------- 面包屑 ---------- */
.breadcrumb{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--dim)}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb-item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb-item + .breadcrumb-item::before{content:"/";color:var(--line)}
.breadcrumb-item[aria-current="page"]{color:var(--text)}
.breadcrumb-link{color:var(--dim);transition:color var(--t) var(--ease)}
.breadcrumb-link:hover{color:var(--cyan)}

/* ---------- 面板 ---------- */
.panel{
  position:relative;
  background:var(--panel);
  border:1px solid var(--line);
  padding:clamp(16px,2vw,24px);
  box-shadow:0 18px 30px -30px rgba(0,0,0,.9);
  transition:border-color var(--t) var(--ease),transform var(--t) var(--ease);
}
.panel:hover{border-color:rgba(59,240,192,.5)}
.panel--flush{padding:0}
.is-lift:hover{transform:translateX(4px)}

/* ---------- 标签 / 统计 / 索引 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid var(--line);
  background:rgba(19,33,28,.7);
  color:var(--dim);
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.6;
  letter-spacing:.12em;
  text-transform:uppercase;
}
.tag--cyan{color:var(--cyan);border-color:rgba(59,240,192,.5)}
.tag--amber{color:var(--amber);border-color:rgba(255,168,61,.5)}

.stat{display:flex;flex-direction:column;gap:4px}
.stat-value{
  font-family:var(--font-mono);
  font-size:clamp(24px,3vw,34px);
  font-weight:600;
  line-height:1;
  letter-spacing:-.02em;
  color:var(--cyan);
  font-variant-numeric:tabular-nums;
}
.stat-label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--dim);
}

.index-list{border-top:1px solid var(--line)}
.index-list li{border-bottom:1px solid var(--line)}
.index-list a{
  display:flex;
  align-items:baseline;
  gap:14px;
  padding:12px 2px;
  color:var(--text);
  transition:color var(--t) var(--ease),padding-left var(--t) var(--ease);
}
.index-list a:hover{color:var(--cyan);padding-left:6px}
.index-num{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--dim);
  min-width:2.4em;
}

/* ---------- 视觉容器（页面阶段放图 / 放 SVG） ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid var(--line);
  background:linear-gradient(150deg,var(--teal),var(--ink-2) 62%);
  isolation:isolate;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:repeating-linear-gradient(0deg,rgba(233,245,239,.05) 0 1px,transparent 1px 4px);
  opacity:.6;
}
.media-frame img{width:100%;height:100%;object-fit:cover;filter:saturate(.92) contrast(1.06)}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-caption{
  display:block;
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--dim);
}

/* ==========================================================================
   头部：左右分置
   ========================================================================== */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(5,16,12,.93);
  border-bottom:1px solid var(--line);
  color:var(--text);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
}
.header-inner{
  display:flex;
  align-items:center;
  gap:clamp(16px,3vw,40px);
  width:100%;
  max-width:var(--max);
  margin-inline:auto;
  padding:12px var(--gutter);
  min-height:74px;
  transition:min-height var(--t) var(--ease),padding var(--t) var(--ease);
}
.site-header[data-condensed] .header-inner{min-height:56px;padding-block:7px}

.brand{display:flex;flex-direction:column;gap:2px;min-width:0}
.brand-mark{
  font-family:var(--font-display);
  font-size:clamp(20px,2.2vw,25px);
  font-weight:800;
  line-height:1.1;
  letter-spacing:.02em;
  color:var(--text);
  transition:color var(--t) var(--ease);
}
.brand-mark:hover{color:var(--cyan)}
.brand-meta{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--dim);
}

.site-nav{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.8vw,24px);
  margin-left:auto;
}
.nav-list{display:flex;align-items:center;gap:clamp(6px,1.2vw,18px)}
.nav-item{flex:0 0 auto}
.nav-link{
  display:inline-flex;
  align-items:center;
  padding:6px 2px;
  color:var(--dim);
  font-size:15px;
  line-height:1.4;
  border-bottom:2px solid transparent;
  transition:color var(--t) var(--ease),border-color var(--t) var(--ease);
}
.nav-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.nav-link[aria-current="page"]{color:var(--text);border-bottom-color:var(--cyan)}

.cta-feedback{
  display:inline-flex;
  align-items:center;
  padding:9px 18px;
  border:1px solid var(--cyan);
  color:var(--cyan);
  font-size:14px;
  font-weight:500;
  letter-spacing:.04em;
  white-space:nowrap;
  transition:background-color var(--t) var(--ease),
             color var(--t) var(--ease),
             transform var(--t) var(--ease);
}
.cta-feedback:hover{background:var(--cyan);color:var(--ink);transform:translateX(4px)}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  margin-left:auto;
  padding:8px 12px;
  border:1px solid var(--line);
  color:var(--text);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  transition:border-color var(--t) var(--ease),color var(--t) var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle-bar{
  display:block;
  width:16px;
  height:2px;
  background:currentColor;
  box-shadow:0 -5px 0 currentColor,0 5px 0 currentColor;
  transition:box-shadow var(--t) var(--ease);
}
.nav-toggle-text{line-height:1}
.site-header[data-open] .nav-toggle{border-color:var(--cyan);color:var(--cyan)}
.site-header[data-open] .nav-toggle-bar{box-shadow:0 0 0 currentColor}

.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--amber));
  transform:scaleX(0);
  transform-origin:0 50%;
  pointer-events:none;
}

/* ==========================================================================
   页脚：四栏 + 联系锚点
   ========================================================================== */
.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  background:var(--ink-2);
  border-top:1px solid var(--line);
  color:var(--dim);
}
.footer-ridge{
  height:38px;
  background:linear-gradient(90deg,var(--teal),var(--ink-2) 78%);
  clip-path:polygon(0 100%,0 58%,8% 42%,17% 64%,26% 30%,35% 56%,45% 24%,56% 52%,66% 34%,76% 58%,86% 38%,94% 60%,100% 44%,100% 100%);
  opacity:.9;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.35fr 1.5fr .9fr .9fr;
  gap:clamp(20px,3vw,40px);
  max-width:var(--max);
  margin-inline:auto;
  padding:clamp(30px,5vw,58px) var(--gutter) clamp(24px,3vw,34px);
}
.footer-col{min-width:0}

.footer-brand-mark{
  display:inline-block;
  font-family:var(--font-display);
  font-size:22px;
  font-weight:800;
  letter-spacing:.02em;
  color:var(--text);
  transition:color var(--t) var(--ease);
}
.footer-brand-mark:hover{color:var(--cyan)}
.footer-tagline{margin-top:12px;max-width:26ch;font-size:14px;line-height:1.8;color:var(--dim)}
.footer-version{
  margin-top:16px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:rgba(163,184,174,.72);
}

.footer-heading{
  margin-bottom:14px;
  padding-bottom:8px;
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--text);
}

.footer-contact{
  position:relative;
  padding:clamp(16px,2vw,22px);
  border:1px solid rgba(59,240,192,.45);
  background:linear-gradient(180deg,rgba(59,240,192,.08),rgba(59,240,192,0) 72%);
  box-shadow:inset 0 0 0 1px rgba(5,16,12,.6);
}
.footer-contact::before{
  content:"";
  position:absolute;
  left:-1px;
  top:-1px;
  width:14px;
  height:14px;
  border-left:2px solid var(--cyan);
  border-top:2px solid var(--cyan);
}
.footer-contact .footer-heading{color:var(--cyan);border-bottom-color:rgba(59,240,192,.3)}
.contact-email{
  display:block;
  margin-bottom:10px;
  font-family:var(--font-mono);
  font-size:clamp(14px,1.5vw,16px);
  letter-spacing:.01em;
  color:var(--cyan);
  word-break:break-all;
}
.contact-line{font-size:14px;line-height:1.7;color:var(--text)}
.contact-note{margin-top:10px;font-size:12px;line-height:1.7;color:var(--dim)}

.footer-list{display:flex;flex-direction:column;gap:2px}
.footer-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:5px 0;
  font-size:14px;
  color:var(--dim);
  transition:color var(--t) var(--ease);
}
.footer-link::before{
  content:"";
  width:0;
  height:1px;
  background:var(--cyan);
  transition:width var(--t) var(--ease);
}
.footer-link:hover{color:var(--cyan)}
.footer-link:hover::before{width:12px}

.footer-icp{
  margin-top:18px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--dim);
}
.footer-copy{
  margin-top:6px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--dim);
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width:1080px){
  .footer-grid{grid-template-columns:1fr 1fr}
}

@media (max-width:900px){
  .header-inner{flex-wrap:wrap;min-height:0;padding-block:10px;gap:10px 14px}
  .site-header[data-condensed] .header-inner{min-height:0;padding-block:10px}
  .brand{flex-direction:row;align-items:baseline;gap:8px}
  .brand-meta{font-size:9px;letter-spacing:.16em}
  .nav-toggle{display:inline-flex}
  .site-nav{
    display:none;
    flex:1 0 100%;
    flex-direction:column;
    align-items:stretch;
    gap:12px;
    margin-left:0;
    padding-top:12px;
    border-top:1px solid var(--line);
  }
  .site-header[data-open] .site-nav{display:flex}
  .nav-list{
    overflow-x:auto;
    gap:8px;
    padding-bottom:4px;
    scrollbar-width:none;
    -webkit-overflow-scrolling:touch;
  }
  .nav-list::-webkit-scrollbar{display:none}
  .nav-link{
    padding:8px 12px;
    border:1px solid var(--line);
    border-bottom-width:1px;
    white-space:nowrap;
  }
  .nav-link:hover{border-color:var(--cyan)}
  .nav-link[aria-current="page"]{border-color:var(--cyan);color:var(--cyan)}
  .cta-feedback{justify-content:center}

  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:span 6}
}

@media (max-width:640px){
  .section{padding-block:clamp(32px,7vw,52px)}
  .grid-12{grid-template-columns:1fr}
  .span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:span 1}
  .footer-grid{grid-template-columns:1fr;padding-top:clamp(24px,6vw,36px)}
  .footer-tagline{max-width:none}
  .footer-ridge{height:26px}
  .media-frame--wide{aspect-ratio:16/9}
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  .btn:hover,
  .cta-feedback:hover,
  .is-lift:hover,
  .index-list a:hover,
  .nav-link,
  .footer-link::before{transform:none;transition:none}
  .scroll-progress{transition:none}
}