/* bb体育官网 - 全站样式表 */
:root{
  --navy:#0a2540;
  --navy2:#123a63;
  --blue:#1565c0;
  --blue2:#1976d2;
  --ice:#4fc3f7;
  --cyan:#00bcd4;
  --white:#f5f7fa;
  --silver:#b0bec5;
  --green:#2e7d32;
  --orange:#ef6c00;
  --text:#1b2733;
  --text-light:#5a6b7a;
  --border:#dbe3ea;
  --card-bg:#ffffff;
  --radius:14px;
  --shadow:0 8px 24px rgba(10,37,64,0.10);
  --shadow-lg:0 16px 40px rgba(10,37,64,0.16);
  --maxw:1280px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  color:var(--text);
  background:var(--white);
  line-height:1.75;
}
img{max-width:100%;display:block;}
a{color:var(--blue);text-decoration:none;}
a:hover{text-decoration:underline;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px;}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px;}

/* header */
.site-header{
  position:sticky;top:0;z-index:100;
  background:linear-gradient(90deg,var(--navy),var(--navy2));
  box-shadow:0 2px 12px rgba(0,0,0,0.18);
}
.header-inner{
  max-width:var(--maxw);margin:0 auto;padding:0 20px;
  display:flex;align-items:center;justify-content:space-between;height:72px;
}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:20px;}
.brand img{width:38px;height:38px;border-radius:8px;}
.brand span.tag{font-size:12px;font-weight:400;color:var(--ice);display:block;}
.main-nav ul{list-style:none;display:flex;gap:6px;margin:0;padding:0;}
.main-nav a{
  color:#e7f0fb;padding:10px 14px;border-radius:8px;font-size:15px;font-weight:500;white-space:nowrap;
}
.main-nav a:hover,.main-nav a.active{background:rgba(255,255,255,0.14);color:#fff;text-decoration:none;}
.nav-toggle{display:none;background:none;border:1px solid rgba(255,255,255,0.4);color:#fff;font-size:22px;padding:4px 12px;border-radius:8px;cursor:pointer;}

/* breadcrumb */
.breadcrumb{background:#eef3f8;padding:10px 0;font-size:13px;color:var(--text-light);}
.breadcrumb a{color:var(--blue);}
.breadcrumb .sep{margin:0 6px;color:var(--silver);}

/* hero */
.hero{
  background:radial-gradient(circle at 20% 20%,rgba(79,195,247,0.15),transparent 45%),linear-gradient(135deg,var(--navy),var(--navy2) 60%,#0d3a63);
  color:#fff;padding:56px 0;
}
.hero-inner{display:flex;align-items:center;gap:40px;flex-wrap:wrap;}
.hero-text{flex:1 1 420px;}
.hero-text h1{font-size:32px;line-height:1.4;margin:0 0 16px;color:#fff;}
.hero-text p{font-size:16px;color:#d7e6f5;max-width:620px;}
.hero-media{flex:1 1 480px;}
.hero-media img{border-radius:var(--radius);box-shadow:var(--shadow-lg);}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px;}
.hero-tags span{background:rgba(255,255,255,0.12);border:1px solid rgba(255,255,255,0.25);color:#eaf3fb;padding:6px 12px;border-radius:20px;font-size:13px;}

/* page header (non-home) */
.page-hero{background:linear-gradient(120deg,var(--navy),var(--navy2));color:#fff;padding:40px 0;}
.page-hero h1{margin:0 0 10px;font-size:28px;color:#fff;}
.page-hero p{color:#d7e6f5;max-width:820px;margin:0;font-size:15px;}

section{padding:44px 0;}
section.alt{background:#eef3f8;}
h2{font-size:24px;color:var(--navy);margin:0 0 18px;border-left:5px solid var(--orange);padding-left:12px;}
h3{font-size:18px;color:var(--navy2);margin:22px 0 10px;}
p{margin:0 0 14px;color:var(--text);}
.lead{font-size:16px;color:var(--text-light);}

/* cards grid */
.grid{display:grid;gap:20px;}
.grid.cols-2{grid-template-columns:repeat(2,1fr);}
.grid.cols-3{grid-template-columns:repeat(3,1fr);}
.grid.cols-4{grid-template-columns:repeat(4,1fr);}
.card{
  background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;
  transition:transform .2s ease,box-shadow .2s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);}
.card img{width:100%;height:170px;object-fit:cover;background:var(--navy);}
.card-body{padding:16px 18px 20px;flex:1;display:flex;flex-direction:column;}
.card-body h3{margin-top:0;}
.card-tag{display:inline-block;background:#e3f2fb;color:var(--blue);font-size:12px;padding:3px 10px;border-radius:12px;margin-bottom:8px;align-self:flex-start;}
.disclaimer-line{font-size:12px;color:var(--orange);border-top:1px dashed var(--border);margin-top:10px;padding-top:8px;}
.card-body .meta{font-size:12px;color:var(--text-light);margin-top:auto;}

/* career filter */
.filter-bar{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:22px;}
.filter-bar button{
  background:#fff;border:1px solid var(--border);color:var(--navy2);
  padding:8px 16px;border-radius:20px;cursor:pointer;font-size:13px;
}
.filter-bar button.active,.filter-bar button:hover{background:var(--blue);color:#fff;border-color:var(--blue);}

/* table */
.table-wrap{overflow-x:auto;margin:18px 0;border-radius:var(--radius);box-shadow:var(--shadow);}
table{width:100%;border-collapse:collapse;background:#fff;min-width:640px;}
th,td{padding:12px 14px;border-bottom:1px solid var(--border);text-align:left;font-size:14px;}
thead th{background:var(--navy);color:#fff;font-weight:600;}
tbody tr:nth-child(even){background:#f6f9fc;}
.risk{color:#c62828;font-weight:600;}
.ok{color:var(--green);font-weight:600;}
.na{color:var(--text-light);}

/* box notes */
.note-box{background:#fff7e6;border:1px solid #f2c94c;border-radius:10px;padding:16px 18px;margin:18px 0;font-size:14px;color:#6b4e00;}
.warn-box{background:#fdecea;border:1px solid #f5b7b1;border-radius:10px;padding:16px 18px;margin:18px 0;font-size:14px;color:#9c2b1f;}
.info-box{background:#e8f4fd;border:1px solid #b6def5;border-radius:10px;padding:16px 18px;margin:18px 0;font-size:14px;color:#0d3a63;}
.disclaimer-box{background:#eef3f8;border-left:4px solid var(--navy2);border-radius:6px;padding:14px 18px;margin:18px 0;font-size:13px;color:var(--text-light);}

/* article */
.article-list{display:flex;flex-direction:column;gap:24px;}
.article{background:#fff;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;}
.article-media img{width:100%;max-height:340px;object-fit:cover;}
.article-body{padding:22px 26px 28px;}
.article-meta{font-size:12px;color:var(--text-light);display:flex;flex-wrap:wrap;gap:12px;margin-bottom:10px;}
.article-meta span{background:#eef3f8;padding:3px 10px;border-radius:10px;}
.article-category{background:#e3f2fb;color:var(--blue);}
.figcaption{font-size:12px;color:var(--text-light);padding:8px 26px 0;}
.article-links{margin-top:16px;font-size:13px;}
.article-links a{margin-right:14px;}

/* FAQ */
.faq-item{border-bottom:1px solid var(--border);}
.faq-q{
  width:100%;text-align:left;background:none;border:none;padding:16px 0;
  font-size:15px;font-weight:600;color:var(--navy2);cursor:pointer;
  display:flex;justify-content:space-between;align-items:center;
}
.faq-q::after{content:"+";font-size:20px;color:var(--orange);}
.faq-item.open .faq-q::after{content:"−";}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease;font-size:14px;color:var(--text-light);}
.faq-item.open .faq-a{max-height:600px;padding-bottom:16px;}

/* AI assistant */
.ai-box{background:linear-gradient(135deg,var(--navy),var(--navy2));color:#fff;border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-lg);}
.ai-box h2{color:#fff;border-left-color:var(--ice);}
.ai-chat{background:rgba(255,255,255,0.06);border:1px solid rgba(255,255,255,0.18);border-radius:10px;padding:16px;min-height:160px;max-height:320px;overflow-y:auto;margin-bottom:14px;font-size:14px;}
.ai-chat .msg{margin-bottom:10px;padding:8px 12px;border-radius:8px;max-width:85%;}
.ai-chat .msg.bot{background:rgba(255,255,255,0.14);}
.ai-chat .msg.user{background:var(--orange);margin-left:auto;}
.ai-quick{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px;}
.ai-quick button{background:rgba(255,255,255,0.12);border:1px solid rgba(255,255,255,0.3);color:#fff;padding:6px 12px;border-radius:16px;font-size:12px;cursor:pointer;}
.ai-quick button:hover{background:rgba(255,255,255,0.28);}
.ai-input-row{display:flex;gap:8px;}
.ai-input-row input{flex:1;padding:10px 12px;border-radius:8px;border:none;font-size:14px;}
.ai-input-row button{background:var(--orange);color:#fff;border:none;padding:10px 18px;border-radius:8px;cursor:pointer;font-weight:600;}
.ai-disclaimer{font-size:12px;color:#c9d9e8;margin-top:10px;}

/* forms */
.register-demo{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);max-width:520px;}
.register-demo label{display:block;font-size:13px;color:var(--text-light);margin-bottom:14px;}
.register-demo input{width:100%;margin-top:6px;padding:10px 12px;border:1px solid var(--border);border-radius:8px;background:#f6f9fc;color:var(--text);font-size:14px;}
.register-demo button{background:var(--blue);color:#fff;border:none;padding:10px 20px;border-radius:8px;cursor:pointer;font-weight:600;}
.register-demo button:hover{background:var(--blue2);}

/* buttons */
.btn{display:inline-block;background:var(--blue);color:#fff;padding:10px 20px;border-radius:8px;font-weight:600;font-size:14px;border:none;cursor:pointer;}
.btn:hover{background:var(--blue2);text-decoration:none;}
.btn.secondary{background:transparent;border:1px solid var(--blue);color:var(--blue);}
.btn.orange{background:var(--orange);}
.download-btns{display:flex;flex-wrap:wrap;gap:12px;margin:16px 0;}

/* timeline */
.timeline{display:flex;flex-direction:column;gap:0;border-left:3px solid var(--ice);margin-left:10px;padding-left:24px;}
.timeline-item{position:relative;padding-bottom:26px;}
.timeline-item::before{content:"";position:absolute;left:-31px;top:4px;width:14px;height:14px;border-radius:50%;background:var(--orange);border:3px solid #fff;box-shadow:0 0 0 2px var(--ice);}
.timeline-item h3{margin:0 0 6px;}

/* progress demo */
.progress-bar{background:#e0e7ee;border-radius:20px;height:10px;overflow:hidden;margin:6px 0 4px;}
.progress-bar span{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--cyan));}

/* checkbox list */
.pref-list{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;}
.pref-list label{background:#fff;border:1px solid var(--border);border-radius:8px;padding:10px 12px;font-size:13px;display:flex;align-items:center;gap:8px;cursor:pointer;}

/* footer */
.site-footer{background:var(--navy);color:#c9d9e8;padding:44px 0 20px;margin-top:20px;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:28px;margin-bottom:26px;}
.footer-grid h4{color:#fff;font-size:14px;margin:0 0 12px;}
.footer-grid ul{list-style:none;margin:0;padding:0;}
.footer-grid li{margin-bottom:8px;font-size:13px;}
.footer-grid a{color:#c9d9e8;}
.footer-grid a:hover{color:#fff;}
.footer-info p{font-size:12px;color:#93a9bd;margin:4px 0;}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.12);padding-top:16px;font-size:12px;color:#7f97ac;text-align:center;}

/* back to top */
#back-to-top{
  position:fixed;right:22px;bottom:22px;width:44px;height:44px;border-radius:50%;
  background:var(--blue);color:#fff;border:none;font-size:18px;cursor:pointer;
  box-shadow:var(--shadow-lg);display:none;z-index:200;
}
#back-to-top.show{display:block;}

/* game / interactive */
.game-box{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);margin-bottom:22px;}
.game-options{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0;}
.game-options button{background:#eef3f8;border:1px solid var(--border);padding:8px 14px;border-radius:8px;cursor:pointer;font-size:13px;}
.game-options button:hover{background:var(--ice);color:#fff;}
.game-result{font-size:14px;font-weight:600;margin-top:10px;min-height:20px;}
.game-result.correct{color:var(--green);}
.game-result.wrong{color:#c62828;}

/* device compat table icons */
.yes{color:var(--green);font-weight:700;}
.no{color:var(--text-light);}

@media(max-width:960px){
  .grid.cols-4{grid-template-columns:repeat(2,1fr);}
  .grid.cols-3{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .pref-list{grid-template-columns:repeat(2,1fr);}
}
@media(max-width:768px){
  .main-nav{display:none;position:absolute;top:72px;left:0;right:0;background:var(--navy2);box-shadow:var(--shadow-lg);}
  .main-nav.open{display:block;}
  .main-nav ul{flex-direction:column;padding:10px;}
  .nav-toggle{display:block;}
  .hero-text h1{font-size:24px;}
  .grid.cols-2,.grid.cols-3,.grid.cols-4{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .pref-list{grid-template-columns:1fr;}
  h2{font-size:20px;}
  .page-hero h1{font-size:22px;}
}