/* 龙虎斗游戏官网官网 - 静态样式表 */
:root{
  --bg-graphite:#14161c;
  --bg-navy:#0d1626;
  --bg-panel:#1b1f2a;
  --bg-panel-2:#1f2433;
  --line:#2b3142;
  --text-main:#eef1f6;
  --text-dim:#a7afc2;
  --accent-cyan:#2de2e6;
  --accent-purple:#8b5cf6;
  --gold:#f5c542;
  --danger:#ff4d5e;
  --radius:10px;
  --max-w:1180px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:linear-gradient(180deg,var(--bg-navy) 0%,var(--bg-graphite) 320px,var(--bg-graphite) 100%);
  color:var(--text-main);
  font-family:"PingFang SC","Microsoft YaHei","Segoe UI",Arial,sans-serif;
  line-height:1.75;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:var(--accent-cyan);text-decoration:none;}
a:hover{text-decoration:underline;}
.container{max-width:var(--max-w);margin:0 auto;padding:0 20px;}
h1,h2,h3{line-height:1.35;color:var(--text-main);}
h1{font-size:1.9rem;}
h2{font-size:1.5rem;margin-top:0;}
h3{font-size:1.15rem;}
p{margin:0 0 1em;}
.text-dim{color:var(--text-dim);}

/* Header / Nav */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(13,22,38,0.92);
  backdrop-filter:blur(6px);
  border-bottom:1px solid var(--line);
}
.nav-bar{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;max-width:var(--max-w);margin:0 auto;}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.05rem;color:var(--text-main);}
.brand img{width:34px;height:34px;}
.nav-toggle{
  display:none;background:none;border:1px solid var(--line);color:var(--text-main);
  border-radius:6px;padding:6px 10px;font-size:1rem;cursor:pointer;
}
.nav-links{display:flex;flex-wrap:wrap;gap:4px 6px;}
.nav-links a{
  color:var(--text-dim);padding:8px 10px;border-radius:6px;font-size:0.92rem;white-space:nowrap;
}
.nav-links a:hover,.nav-links a.active{color:var(--bg-graphite);background:var(--accent-cyan);text-decoration:none;}
@media (max-width:900px){
  .nav-toggle{display:inline-block;}
  .nav-links{
    display:none;flex-direction:column;width:100%;
    padding:10px 0 4px;
  }
  .nav-links.open{display:flex;}
  .nav-bar{flex-wrap:wrap;}
}

/* Hero */
.hero{padding:56px 0 40px;}
.hero-grid{display:grid;grid-template-columns:1.15fr 0.85fr;gap:36px;align-items:center;}
@media (max-width:820px){.hero-grid{grid-template-columns:1fr;}}
.hero h1{font-size:2.1rem;margin-bottom:14px;}
.hero .lead{color:var(--text-dim);font-size:1.05rem;}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0;}
.tag{
  border:1px solid var(--line);color:var(--accent-cyan);
  border-radius:999px;padding:4px 12px;font-size:0.82rem;background:rgba(45,226,230,0.06);
}
.breadcrumb{font-size:0.85rem;color:var(--text-dim);padding:14px 0 0;}
.breadcrumb a{color:var(--text-dim);}
.breadcrumb a:hover{color:var(--accent-cyan);}

/* Sections */
section{padding:44px 0;border-top:1px solid var(--line);}
section:first-of-type{border-top:none;}
.section-head{margin-bottom:22px;}
.section-head .eyebrow{color:var(--accent-purple);font-size:0.85rem;letter-spacing:0.04em;text-transform:uppercase;}
.section-head p{color:var(--text-dim);max-width:760px;}

/* Cards / grid */
.grid{display:grid;gap:18px;}
.grid-4{grid-template-columns:repeat(4,1fr);}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-2{grid-template-columns:repeat(2,1fr);}
@media (max-width:900px){.grid-4{grid-template-columns:repeat(2,1fr);}.grid-3{grid-template-columns:repeat(2,1fr);}}
@media (max-width:600px){.grid-4,.grid-3,.grid-2{grid-template-columns:1fr;}}
.card{
  background:var(--bg-panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;
}
.card h3{margin-top:0;}
.stat-card{text-align:center;}
.stat-card .num{font-size:1.7rem;color:var(--accent-cyan);font-weight:700;}
.stat-card .label{color:var(--text-dim);font-size:0.85rem;}

/* Articles */
article.feature{
  background:var(--bg-panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 26px 20px;margin-bottom:26px;
}
article.feature h2{font-size:1.35rem;}
article.feature .meta{color:var(--text-dim);font-size:0.82rem;margin-bottom:14px;}
article.feature figure{margin:16px 0;text-align:center;}
article.feature figcaption{color:var(--text-dim);font-size:0.82rem;margin-top:8px;}
.related-reading{
  margin-top:18px;padding-top:14px;border-top:1px dashed var(--line);
  font-size:0.9rem;
}
.related-reading h3{font-size:0.95rem;color:var(--text-dim);margin:0 0 8px;font-weight:600;}
.related-reading a{display:inline-block;margin:0 14px 6px 0;}

/* Summary cards linking to secondary pages */
.summary-card{background:var(--bg-panel-2);border:1px solid var(--line);border-radius:var(--radius);padding:16px;}
.summary-card h4{margin:0 0 8px;font-size:1rem;}
.summary-card h4 a{color:var(--text-main);}
.summary-card p{color:var(--text-dim);font-size:0.9rem;margin:0;}
.summary-card .more{display:inline-block;margin-top:8px;font-size:0.85rem;}

/* Observation blocks */
.observe{background:var(--bg-panel);border-left:3px solid var(--gold);border-radius:6px;padding:18px 20px;margin-bottom:16px;}
.observe h3{margin-top:0;}

/* FAQ */
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{
  width:100%;text-align:left;background:none;border:none;color:var(--text-main);
  padding:14px 4px;font-size:1rem;cursor:pointer;display:flex;justify-content:space-between;gap:12px;
}
.faq-q .icon{color:var(--accent-cyan);}
.faq-a{display:none;padding:0 4px 16px;color:var(--text-dim);}
.faq-item.open .faq-a{display:block;}

/* Company / disclaimer */
.disclaimer{color:var(--text-dim);font-size:0.85rem;background:var(--bg-panel-2);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;}

/* Footer */
.site-footer{border-top:1px solid var(--line);padding:34px 0;color:var(--text-dim);font-size:0.85rem;}
.site-footer .foot-grid{display:flex;flex-wrap:wrap;justify-content:space-between;gap:20px;}
.site-footer a{color:var(--text-dim);}
.site-footer a:hover{color:var(--accent-cyan);}

/* Back to top */
#back-to-top{
  position:fixed;right:20px;bottom:24px;width:42px;height:42px;border-radius:50%;
  background:var(--accent-cyan);color:var(--bg-graphite);border:none;font-size:1.1rem;
  cursor:pointer;display:none;align-items:center;justify-content:center;box-shadow:0 4px 14px rgba(0,0,0,0.4);
  z-index:60;
}
#back-to-top.show{display:flex;}

/* Tabs (segment balance interactive demo) */
.tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px;}
.tab-btn{
  background:var(--bg-panel-2);border:1px solid var(--line);color:var(--text-dim);
  border-radius:6px;padding:6px 14px;cursor:pointer;font-size:0.88rem;
}
.tab-btn.active{background:var(--accent-purple);color:#fff;border-color:var(--accent-purple);}
.tab-panel{display:none;}
.tab-panel.active{display:block;}
.bar-row{display:flex;align-items:center;gap:10px;margin:8px 0;font-size:0.88rem;}
.bar-row .name{width:110px;color:var(--text-dim);flex-shrink:0;}
.bar-track{flex:1;background:var(--bg-panel-2);border-radius:4px;overflow:hidden;height:14px;}
.bar-fill{height:100%;background:linear-gradient(90deg,var(--accent-cyan),var(--accent-purple));}
.bar-val{width:48px;text-align:right;color:var(--text-main);flex-shrink:0;}

.btn{
  display:inline-block;background:var(--accent-cyan);color:var(--bg-graphite);
  padding:10px 20px;border-radius:6px;font-weight:600;border:none;
}
.btn:hover{text-decoration:none;opacity:0.9;}
.btn-outline{background:none;border:1px solid var(--accent-cyan);color:var(--accent-cyan);}