:root{
  --brand: rgb(213, 5, 5);
  --brand-dark: rgb(180, 4, 4);
  --brand-soft: rgba(213,5,5,.08);
  --text: #151515;
  --muted: #626262;
  --line: #e8e8e8;
  --light: #f6f6f6;
  --white: #ffffff;
  --radius: 18px;
  --shadow: 0 10px 28px rgba(0,0,0,.07);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:#fff;color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;line-height:1.7;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
.container{width:min(1120px,calc(100% - 32px));margin:0 auto}
.section{padding:48px 0}
.section-light{background:var(--light)}
.section-title{margin:0 0 12px;font-size:28px;line-height:1.25;letter-spacing:-.02em;color:#111}
.section-desc{margin:0 0 24px;color:var(--muted);font-size:15px;max-width:780px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;margin-bottom:12px;padding:5px 12px;border-radius:999px;background:var(--brand-soft);color:var(--brand);font-size:13px;font-weight:700}
.main-btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 22px;border-radius:999px;background:var(--brand);color:#fff;font-weight:800;box-shadow:0 10px 24px rgba(213,5,5,.2);transition:.2s ease}
.main-btn:hover{background:var(--brand-dark);transform:translateY(-1px)}
.text-link{display:inline-flex;align-items:center;gap:8px;color:var(--brand);font-weight:800;margin-top:10px}
.text-link:after{content:'›';font-size:18px;line-height:1}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.site-header{position:relative;z-index:20;background:#fff}
.mobile-head{height:64px;display:grid;grid-template-columns:64px 1fr 86px;align-items:center;background:#fff;border-bottom:3px solid var(--brand-dark);position:sticky;top:0;z-index:30}
.nav-switch{position:absolute;opacity:0;pointer-events:none}
.menu-button{width:64px;height:64px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;cursor:pointer}
.menu-button span{width:24px;height:2px;background:#222;border-radius:2px;transition:.2s}
.mobile-logo{justify-self:center;display:flex;align-items:center;justify-content:center;max-width:132px}
.mobile-logo img{max-height:38px;object-fit:contain}
.top-action{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;background:var(--brand);color:#fff;font-weight:800;min-height:38px;padding:0 16px;font-size:14px;white-space:nowrap}
.mobile-head>.top-action{justify-self:end;margin-right:12px}
.mobile-nav{display:none;position:absolute;left:0;right:0;top:64px;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 16px 24px rgba(0,0,0,.08);padding:10px 16px 16px;grid-template-columns:repeat(2,1fr);gap:10px}
.mobile-nav a{padding:12px 14px;border-radius:12px;background:#fafafa;border:1px solid #eee;color:#333;font-weight:700}
.mobile-nav a.active{background:var(--brand);border-color:var(--brand);color:#fff}
.nav-switch:checked~.mobile-nav{display:grid}
.nav-switch:checked+.menu-button span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-switch:checked+.menu-button span:nth-child(2){opacity:0}
.nav-switch:checked+.menu-button span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.desktop-head{display:none}
.official-hero{background:linear-gradient(180deg,#fff 0%,#fff 55%,#f7f7f7 100%);padding:34px 0 44px;border-bottom:1px solid #eee}
.hero-grid{display:grid;gap:28px;align-items:center}
.hero-copy h1{font-size:34px;line-height:1.18;margin:0 0 16px;color:#111;letter-spacing:-.03em}
.hero-copy p{margin:0 0 20px;color:#484848;font-size:16px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.hero-tags span{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#333;font-size:13px;font-weight:700}
.hero-visual{position:relative;border-radius:24px;overflow:hidden;background:#fff;box-shadow:var(--shadow);border:1px solid #eee}
.hero-visual:before{content:'B体育官方入口';position:absolute;left:16px;top:16px;background:var(--brand-dark);color:#fff;font-weight:800;font-size:13px;padding:6px 12px;border-radius:999px;z-index:2}
.hero-visual img{width:100%;height:260px;object-fit:cover}
.entry-note{margin-top:18px;padding:14px 16px;border-left:4px solid var(--brand);background:#fff;border-radius:12px;color:#555;font-size:14px}
.category-navigation-section{padding:48px 0;background:#fff}
.category-main-grid{display:grid;gap:16px;margin-top:22px}
.category-main-card{padding:22px;border-radius:20px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow);position:relative;overflow:hidden}
.category-main-card:before{content:'';position:absolute;right:-30px;top:-30px;width:110px;height:110px;border-radius:50%;background:var(--brand-soft)}
.category-main-card h3,.category-sub-card h3{margin:0 0 10px;font-size:20px;position:relative}
.category-main-card p,.category-sub-card p{margin:0;color:#5b5b5b;font-size:15px;position:relative}
.category-sub-grid{display:grid;gap:14px;margin-top:14px}
.category-sub-card{padding:18px;border-radius:18px;background:#fafafa;border:1px solid #ededed}
.focus-match-cards{display:grid;gap:16px;margin-top:22px}
.match-card{padding:22px;border-radius:20px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)}
.match-badge{display:inline-flex;margin-bottom:10px;padding:5px 10px;border-radius:999px;background:var(--brand);color:#fff;font-size:12px;font-weight:800}
.match-card h3{margin:0 0 10px;font-size:20px}
.match-card p{margin:0;color:#5b5b5b;font-size:15px}
.info-split-section{padding:52px 0;background:#f8f8f8}
.info-split{display:grid;gap:20px}
.info-column{background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:var(--shadow)}
.info-column h2{margin:0 0 14px;font-size:24px}
.info-list{display:grid;gap:12px}
.info-item{padding:16px;border-radius:16px;background:#fafafa;border:1px solid #eee}
.info-item h3{margin:0 0 8px;font-size:17px}
.info-item p{margin:0;color:#5f5f5f;font-size:14px}
.info-image{margin-top:16px;border-radius:18px;overflow:hidden;border:1px solid #eee}
.info-image img{width:100%;height:210px;object-fit:cover}
.sports-showcase,.score-data-section,.app-showcase{padding:52px 0;background:#fff}
.sports-showcase .showcase-grid,.score-data-section .data-grid,.app-showcase .app-grid{display:grid;gap:24px;align-items:center}
.showcase-image,.data-image,.app-image{border-radius:24px;overflow:hidden;border:1px solid #eee;box-shadow:var(--shadow);background:#fff}
.showcase-image img,.data-image img,.app-image img{width:100%;height:260px;object-fit:cover}
.point-list{display:grid;gap:10px;margin:18px 0 0;padding:0;list-style:none}
.point-list li{padding:12px 14px;border-radius:14px;background:#fafafa;border:1px solid #eee;color:#444}
.data-cards{display:grid;gap:12px;margin-top:18px}
.data-card{padding:16px;border-radius:16px;background:#fff;border:1px solid #eee;box-shadow:0 8px 20px rgba(0,0,0,.04)}
.data-card strong{display:block;color:var(--brand);font-size:18px;margin-bottom:6px}
.data-card p{margin:0;color:#626262;font-size:14px}
.app-showcase{background:#f8f8f8}
.app-panel{background:#fff;border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:var(--shadow)}
.security-help-section{padding:52px 0;background:#fff}
.security-grid{display:grid;gap:14px;margin-top:22px}
.security-card{padding:18px;border-radius:18px;background:#fff;border:1px solid var(--line);box-shadow:0 8px 22px rgba(0,0,0,.05)}
.security-card h3{margin:0 0 8px;font-size:18px}
.security-card p{margin:0;color:#5e5e5e;font-size:14px}
.responsible-play-section{padding:52px 0;background:#f7f7f7}
.responsible-box{border-left:5px solid var(--brand);border-radius:18px;background:#fff;padding:24px;box-shadow:var(--shadow)}
.responsible-box h2{margin:0 0 12px;font-size:24px}
.responsible-box p{margin:0 0 12px;color:#565656}
.responsible-box ul{margin:14px 0 0;padding-left:20px;color:#444}
.faq-section{padding:52px 0;background:#fff}
.faq-list{display:grid;gap:12px;margin-top:20px}
.faq-item{border:1px solid var(--line);border-radius:16px;background:#fff;padding:18px;box-shadow:0 8px 18px rgba(0,0,0,.04)}
.faq-item h3{margin:0 0 8px;font-size:18px;color:#111}
.faq-item p{margin:0;color:#595959;font-size:15px}
.cta-section{padding:48px 0;background:linear-gradient(180deg,#fff,#f7f7f7)}
.cta-card{border-radius:24px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);padding:28px;text-align:center}
.cta-card h2{margin:0 0 10px;font-size:26px}
.cta-card p{margin:0 auto 18px;color:#5c5c5c;max-width:760px}
.page-hero{padding:42px 0;background:linear-gradient(180deg,#fff,#f7f7f7);border-bottom:1px solid #eee}
.page-hero .page-kicker{display:inline-flex;margin-bottom:12px;padding:5px 12px;border-radius:999px;background:var(--brand-soft);color:var(--brand);font-weight:800;font-size:13px}
.page-hero h1{margin:0 0 14px;font-size:32px;line-height:1.25;color:#111}
.page-hero p{margin:0;color:#555;max-width:860px;font-size:16px}
.content-grid{display:grid;gap:18px;margin-top:24px}
.content-card{padding:22px;border-radius:20px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)}
.content-card h2{margin:0 0 12px;font-size:22px}
.content-card h3{margin:16px 0 8px;font-size:18px}
.content-card p{margin:0 0 12px;color:#555}
.content-card ul,.number-list{margin:12px 0 0;padding-left:20px;color:#4c4c4c}
.content-card li{margin:8px 0}
.link-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.link-row a{display:inline-flex;padding:9px 13px;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--brand);font-weight:800;font-size:14px}
.two-column{display:grid;gap:18px}
.notice-card{padding:20px;border-radius:18px;background:#fafafa;border-left:4px solid var(--brand);color:#444}
.download-preview{border-radius:18px;margin-bottom:16px}
.steps{counter-reset:step;display:grid;gap:12px;margin-top:18px}
.step{counter-increment:step;padding:18px;border:1px solid var(--line);border-radius:18px;background:#fff;position:relative;padding-left:64px}
.step:before{content:counter(step);position:absolute;left:18px;top:18px;width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:var(--brand);color:#fff;font-weight:900}
.site-footer{background:#202020;color:#e7e7e7;padding:40px 0 20px}
.footer-grid{display:grid;gap:24px}
.footer-logo img{max-height:42px;margin-bottom:12px}
.site-footer p{margin:0;color:#c9c9c9;font-size:14px}
.site-footer h3{margin:0 0 12px;color:#fff;font-size:17px}
.site-footer a{display:block;color:#d7d7d7;margin:6px 0;font-size:14px}
.site-footer a:hover{color:#fff}
.footer-note{border-top:1px solid rgba(255,255,255,.12);margin-top:28px;padding-top:18px;text-align:center}
.footer-note p+p{margin-top:6px}
@media (min-width:640px){
  .category-main-grid,.focus-match-cards,.security-grid,.content-grid{grid-template-columns:repeat(2,1fr)}
  .category-sub-grid{grid-template-columns:repeat(2,1fr)}
  .data-cards{grid-template-columns:repeat(3,1fr)}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr}
}
@media (min-width:900px){
  .mobile-head{display:none}
  .desktop-head{display:block}
  .desktop-topbar{background:var(--brand-dark);color:#fff;font-size:13px}
  .topbar-inner{height:36px;display:flex;align-items:center;justify-content:space-between;gap:18px}
  .desktop-nav-wrap{background:#fff;border-bottom:1px solid var(--line);box-shadow:0 8px 20px rgba(0,0,0,.04)}
  .desktop-nav-inner{height:78px;display:flex;align-items:center;gap:26px}
  .brand-logo img{max-height:48px;max-width:150px;object-fit:contain}
  .desktop-nav{display:flex;align-items:center;gap:2px;flex:1;justify-content:center}
  .desktop-nav a{padding:12px 12px;border-radius:999px;font-weight:800;color:#333;font-size:15px}
  .desktop-nav a:hover,.desktop-nav a.active{background:var(--brand-soft);color:var(--brand)}
  .desktop-tools{display:flex;align-items:center;gap:16px}
  .search-icon{width:34px;height:34px;border:2px solid #333;border-radius:50%;position:relative;display:inline-block}
  .search-icon:after{content:'';position:absolute;width:11px;height:2px;background:#333;right:-6px;bottom:3px;transform:rotate(45deg);border-radius:2px}
  .official-hero{padding:64px 0}
  .hero-grid,.sports-showcase .showcase-grid,.score-data-section .data-grid,.app-showcase .app-grid{grid-template-columns:1.05fr .95fr}
  .hero-copy h1{font-size:52px}
  .hero-copy p{font-size:18px}
  .hero-visual img{height:420px}
  .category-main-grid{grid-template-columns:repeat(4,1fr)}
  .category-main-card{min-height:260px;padding:24px}
  .category-sub-grid{grid-template-columns:repeat(4,1fr)}
  .category-sub-card{min-height:190px}
  .focus-match-cards{grid-template-columns:repeat(4,1fr)}
  .info-split{grid-template-columns:1fr 1fr}
  .showcase-image img,.data-image img,.app-image img{height:380px}
  .security-grid{grid-template-columns:repeat(3,1fr)}
  .content-grid{grid-template-columns:repeat(3,1fr)}
  .two-column{grid-template-columns:1fr 1fr}
  .page-hero{padding:64px 0}
  .page-hero h1{font-size:44px}
}
@media (min-width:1100px){
  .desktop-nav a{padding:12px 16px}
}