/* ==========================================================================
   B体育登录 · 共享站点样式 /assets/site.css
   视觉关键词：战术板 · 档案夹 · 记分屏
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root{
  --red:#D42A1F;
  --red-deep:#8F1811;
  --blue:#1E5BFF;
  --ink:#15171C;
  --panel:#262A32;
  --lime:#C6FF3D;
  --paper:#F5F2EA;
  --mid:#6E7480;
  --line:#B9BFC9;
  --navy:#071324;
  --white:#FFFFFF;
  --on-dark:#F5F2EA;
  --on-dark-dim:#9AA3B0;

  --font-display:"Barlow Condensed","Oswald","Arial Narrow","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:"Roboto Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --font-body:"Noto Sans SC","Source Han Sans SC",-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;

  --shell:1240px;
  --gutter:clamp(16px,4vw,40px);
  --header-h:74px;
  --radius:2px;

  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:.24s;

  --shadow-paper:0 1px 0 rgba(185,191,201,.85),0 16px 32px -20px rgba(7,19,36,.55);
  --shadow-lift:0 24px 44px -24px rgba(7,19,36,.65);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background-color:var(--paper);
  background-image:linear-gradient(180deg,rgba(7,19,36,.05) 0,rgba(7,19,36,0) 260px);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:500;
  line-height:1.72;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg,video,picture{max-width:100%}
img{border-style:none}
button{font:inherit}
ul,ol{margin:0 0 1em;padding-left:1.25em}
p{margin:0 0 1em}
p:last-child,ul:last-child,ol:last-child{margin-bottom:0}
dl,dd{margin:0}
address{font-style:normal}

/* ---------- 3. 中文排版与标题 ---------- */
h1,h2,h3,h4,h5,h6{
  margin:0 0 .5em;
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.05;
  letter-spacing:-.02em;
  text-wrap:balance;
}
h1{font-size:clamp(34px,5.2vw,72px)}
h2{font-size:clamp(26px,3.4vw,44px)}
h3{font-size:clamp(20px,2.2vw,28px)}
h4{font-size:clamp(17px,1.6vw,20px);letter-spacing:0}
h5,h6{font-size:15px;letter-spacing:.04em}

.lead{font-size:clamp(16px,1.5vw,19px);line-height:1.7;color:#3B414C;max-width:62ch}
.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--red);
  margin:0 0 12px;
}
.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  font-weight:700;
  letter-spacing:-.02em;
}
strong,b{font-weight:800}
small{font-size:13px;color:var(--mid)}

/* ---------- 4. 链接与焦点 ---------- */
a{color:var(--blue);text-decoration:none;transition:color var(--dur) var(--ease)}
a:hover{color:var(--red)}
:focus-visible{outline:3px solid var(--blue);outline-offset:3px;border-radius:2px}
.site-header :focus-visible,
.site-footer :focus-visible{outline-color:var(--lime)}

/* ---------- 5. 布局工具 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
#main-content{display:block;scroll-margin-top:calc(var(--header-h) + 16px)}
.grid{display:grid;gap:clamp(16px,2.2vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  border:1px solid transparent;
  border-radius:var(--radius);
  font-family:var(--font-display);
  font-size:15px;
  font-weight:700;
  letter-spacing:.06em;
  line-height:1.2;
  text-align:center;
  text-decoration:none;
  cursor:pointer;
  transition:transform var(--dur) var(--ease),background var(--dur) var(--ease),
             color var(--dur) var(--ease),border-color var(--dur) var(--ease),
             box-shadow var(--dur) var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn--signal{
  background:var(--red);
  border-color:var(--red);
  color:#fff;
  box-shadow:3px 3px 0 var(--lime);
}
.btn--signal:hover{background:var(--red-deep);border-color:var(--red-deep);color:#fff;box-shadow:5px 5px 0 var(--lime)}
.btn--lime{background:var(--lime);border-color:var(--lime);color:var(--navy)}
.btn--lime:hover{background:#D8FF6B;border-color:#D8FF6B;color:var(--navy)}
.btn--ghost{background:transparent;border-color:var(--line);color:var(--ink)}
.btn--ghost:hover{border-color:var(--ink);color:var(--ink)}

/* ---------- 7. 跳转链接 ---------- */
.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-72px;
  z-index:300;
  padding:12px 20px;
  background:var(--lime);
  color:var(--navy);
  font-size:13px;
  font-weight:800;
  letter-spacing:.08em;
  border-radius:0 0 var(--radius) var(--radius);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:0;color:var(--navy);outline-offset:-4px}

/* ---------- 8. 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:var(--ink);
  color:var(--on-dark);
  border-bottom:3px solid var(--red-deep);
  box-shadow:0 12px 28px -24px rgba(7,19,36,.9);
}
.header-rail{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:clamp(10px,1.6vw,24px);
  width:100%;
  max-width:var(--shell);
  min-height:var(--header-h);
  margin-inline:auto;
  padding:0 var(--gutter);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  flex:none;
  padding-block:12px;
  color:var(--on-dark);
  text-decoration:none;
}
.brand:hover{color:var(--on-dark)}
.brand__mark{
  position:relative;
  flex:none;
  display:flex;
  align-items:center;
  justify-content:center;
  width:38px;
  height:38px;
  background:var(--red);
  color:#fff;
  font-family:var(--font-display);
  font-size:19px;
  font-weight:800;
  letter-spacing:-.04em;
  clip-path:polygon(0 0,100% 0,100% 68%,68% 100%,0 100%);
}
.brand__mark::after{
  content:"";
  position:absolute;
  right:0;
  bottom:0;
  width:13px;
  height:13px;
  background:var(--lime);
  clip-path:polygon(100% 0,100% 100%,0 100%);
}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__name{
  font-family:var(--font-display);
  font-size:21px;
  font-weight:800;
  letter-spacing:.01em;
}
.brand__line{
  font-family:var(--font-mono);
  font-size:10px;
  font-weight:700;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--on-dark-dim);
}

.header-rule{
  flex:1 1 40px;
  height:1px;
  min-width:24px;
  background-image:repeating-linear-gradient(90deg,rgba(185,191,201,.45) 0 8px,transparent 8px 16px);
}

/* 移动端开合按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  margin-left:auto;
  padding:9px 14px;
  background:transparent;
  border:1px solid rgba(245,242,234,.32);
  border-radius:var(--radius);
  color:var(--on-dark);
  font-family:var(--font-display);
  font-size:14px;
  font-weight:700;
  letter-spacing:.1em;
  cursor:pointer;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--lime);color:var(--lime);background:rgba(198,255,61,.06)}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:16px;
  height:2px;
  background:currentColor;
  box-shadow:0 -5px 0 currentColor,0 5px 0 currentColor;
  transition:box-shadow var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent;box-shadow:none}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before,
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  top:0;
  width:16px;
  height:2px;
  background:currentColor;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:rotate(-45deg)}

/* 导航 */
.site-nav{
  display:flex;
  align-items:center;
  gap:clamp(8px,1.4vw,18px);
  margin-left:auto;
}
.site-nav__list{
  display:flex;
  align-items:center;
  gap:0;
  margin:0;
  padding:0;
  list-style:none;
}
.site-nav__link{
  position:relative;
  display:block;
  padding:10px 13px;
  color:rgba(245,242,234,.78);
  font-size:14px;
  font-weight:700;
  letter-spacing:.02em;
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:13px;
  right:13px;
  bottom:3px;
  height:2px;
  background:var(--red);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--dur) var(--ease),background var(--dur) var(--ease);
}
.site-nav__link:hover{color:#fff;background:rgba(255,255,255,.05)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:#fff}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--lime)}
.site-nav__cta{padding:10px 18px;font-size:14px;white-space:nowrap}

/* 阅读进度 */
.header-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:3px;
  pointer-events:none;
  z-index:2;
}
.header-progress span{
  display:block;
  width:0;
  height:100%;
  background:var(--lime);
  box-shadow:0 0 10px rgba(198,255,61,.55);
  transition:width .08s linear;
}
.site-header.is-scrolled{border-bottom-color:var(--red)}

/* ---------- 9. 页脚 ---------- */
.site-footer{
  background:var(--navy);
  color:rgba(245,242,234,.82);
  border-top:4px solid var(--red);
  margin-top:clamp(48px,7vw,96px);
}
.footer-top{padding:clamp(40px,6vw,72px) 0 clamp(28px,4vw,44px)}
.footer-shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.footer-mast{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:16px 32px;
  padding-bottom:clamp(22px,3vw,32px);
  border-bottom:1px solid rgba(185,191,201,.18);
}
.footer-brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  color:var(--on-dark);
  text-decoration:none;
}
.footer-brand:hover{color:var(--on-dark)}
.footer-brand__mark{
  position:relative;
  flex:none;
  display:flex;
  align-items:center;
  justify-content:center;
  width:40px;
  height:40px;
  background:var(--red);
  color:#fff;
  font-family:var(--font-display);
  font-size:20px;
  font-weight:800;
  clip-path:polygon(0 0,100% 0,100% 68%,68% 100%,0 100%);
}
.footer-brand__text{display:flex;flex-direction:column;line-height:1.2}
.footer-brand__name{
  font-family:var(--font-display);
  font-size:20px;
  font-weight:800;
  letter-spacing:.01em;
}
.footer-brand__sub{
  font-family:var(--font-mono);
  font-size:10px;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--on-dark-dim);
}
.footer-note{
  margin:0;
  max-width:34ch;
  font-size:13px;
  line-height:1.6;
  color:var(--on-dark-dim);
  text-align:right;
}
.footer-columns{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(210px,1fr));
  gap:clamp(24px,4vw,48px);
  padding-top:clamp(26px,3.6vw,40px);
}
.footer-col{min-width:0}
.footer-heading{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--lime);
}
.footer-links{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.footer-links a{
  display:inline-flex;
  align-items:center;
  gap:9px;
  color:rgba(245,242,234,.82);
  font-size:15px;
  transition:color var(--dur) var(--ease);
}
.footer-links a::before{
  content:"";
  display:block;
  width:10px;
  height:1px;
  background:var(--red);
  transition:width var(--dur) var(--ease),background var(--dur) var(--ease);
}
.footer-links a:hover{color:#fff}
.footer-links a:hover::before{width:20px;background:var(--lime)}
.footer-contact{display:grid;gap:12px;font-size:14px;line-height:1.5}
.footer-contact dt{
  font-family:var(--font-mono);
  font-size:10px;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--on-dark-dim);
  margin-bottom:3px;
}
.footer-contact dd{color:rgba(245,242,234,.88);word-break:break-all}
.footer-address{
  font-size:15px;
  line-height:1.65;
  color:rgba(245,242,234,.88);
  max-width:26ch;
  padding-left:12px;
  border-left:2px solid var(--red);
}
.footer-tags{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 0}
.footer-base{border-top:1px solid rgba(185,191,201,.18);background:rgba(0,0,0,.22)}
.footer-base__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 24px;
  padding-block:18px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--on-dark-dim);
}
.footer-copy,.footer-icp{margin:0}
.footer-icp{color:rgba(245,242,234,.62)}

/* ---------- 10. 通用组件 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 9px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:transparent;
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.1em;
  text-transform:uppercase;
  line-height:1.4;
}
.tag--lime{background:var(--lime);border-color:var(--lime);color:var(--navy)}
.tag--red{background:var(--red);border-color:var(--red);color:#fff}
.tag--blue{background:var(--blue);border-color:var(--blue);color:#fff}
.tag--quiet{background:transparent;border-color:rgba(245,242,234,.32);color:var(--on-dark-dim)}

.panel{
  position:relative;
  padding:clamp(20px,3vw,36px);
  background:var(--white);
  border:1px solid var(--line);
  border-radius:var(--radius);
}
.panel--dark{background:var(--ink);border-color:rgba(185,191,201,.24);color:var(--on-dark)}
.panel--dark a{color:var(--lime)}
.panel--dark a:hover{color:#fff}
.panel--paper{background:var(--paper)}
.paper-stack{position:relative;z-index:0}
.paper-stack::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:-1;
  background:var(--paper);
  border:1px solid var(--line);
  transform:translate(5px,5px) rotate(.4deg);
}

/* 面包屑 */
.crumbs{margin:0 0 clamp(18px,2.4vw,28px)}
.crumbs ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px;
  margin:0;
  padding:0;
  list-style:none;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--mid);
}
.crumbs li{display:inline-flex;align-items:center;gap:6px}
.crumbs li+li::before{content:"/";color:var(--line)}
.crumbs a{color:var(--mid)}
.crumbs a:hover{color:var(--red)}
.crumbs [aria-current="page"]{color:var(--ink)}

/* 图片容器基础 */
.frame{
  position:relative;
  overflow:hidden;
  display:block;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
}
.frame img,
.frame picture,
.frame video{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.frame--r16{aspect-ratio:16/9}
.frame--r43{aspect-ratio:4/3}
.frame--r11{aspect-ratio:1/1}
.frame--r32{aspect-ratio:3/2}
.frame__label{
  position:absolute;
  left:0;
  bottom:0;
  padding:6px 12px;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.12em;
  text-transform:uppercase;
}
.frame__tag{
  position:absolute;
  top:10px;
  left:10px;
  padding:5px 10px;
  background:var(--lime);
  color:var(--navy);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.1em;
  text-transform:uppercase;
}
.img-slot{
  display:grid;
  place-items:center;
  width:100%;
  aspect-ratio:16/9;
  border:1px solid var(--line);
  background-color:var(--panel);
  background-image:repeating-linear-gradient(135deg,rgba(255,255,255,.05) 0 12px,rgba(0,0,0,.14) 12px 24px);
  color:var(--on-dark-dim);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
}

/* ---------- 11. 进入动效（需 JS） ---------- */
.has-js [data-reveal]{
  opacity:0;
  transform:translateY(9px);
  transition:opacity .55s var(--ease),transform .55s var(--ease);
}
.has-js [data-reveal].is-in{opacity:1;transform:none}

/* ---------- 12. 响应式 ---------- */
@media (max-width:1080px){
  .site-nav__link{padding:10px 10px;font-size:13.5px}
  .brand__name{font-size:19px}
}

@media (max-width:980px){
  :root{--header-h:66px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    display:none;
    flex:0 0 100%;
    order:5;
    margin:6px 0 0;
    padding:8px 0 18px;
    border-top:1px solid rgba(245,242,234,.16);
  }
  .site-nav[data-open="true"]{display:block}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;width:100%}
  .site-nav__link{
    padding:14px 8px;
    font-size:15px;
    border-bottom:1px solid rgba(245,242,234,.1);
  }
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{
    background:rgba(30,91,255,.22);
    color:#fff;
    box-shadow:inset 3px 0 0 var(--lime);
  }
  .site-nav__cta{width:100%;margin-top:16px}
  .header-rail{gap:12px}
  .footer-note{text-align:left;max-width:100%}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:720px){
  body{font-size:15.5px;line-height:1.7}
  .brand__line{display:none}
  .brand__mark{width:34px;height:34px;font-size:17px}
  .brand__name{font-size:18px}
  .header-rule{display:none}
  .footer-mast{flex-direction:column;align-items:flex-start}
  .footer-address{max-width:100%}
  .footer-base__inner{justify-content:flex-start}
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:420px){
  .nav-toggle__text{display:none}
  .nav-toggle{padding:10px 12px}
  .footer-base__inner{font-size:11px}
}

/* ---------- 13. 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;
  }
  .btn:hover{transform:none}
  .has-js [data-reveal]{opacity:1 !important;transform:none !important}
  .header-progress span{transition:none !important}
}