/* ==========================================================================
   龙虎斗游戏官网 — 全站样式表
   设计方向：Virtual Character Memory Lab + Gaming Social Graph +
             Relationship Intelligence Console + Community AI Center
   ========================================================================== */

:root{
  --midnight:#0a0e24;
  --midnight-2:#10152f;
  --midnight-3:#161c3d;
  --graphite:#1c2038;
  --graphite-2:#242a48;
  --line:rgba(255,255,255,0.09);
  --line-strong:rgba(255,255,255,0.16);
  --purple:#8b5cf6;
  --purple-soft:#c4b5fd;
  --cyan:#22d3ee;
  --cyan-soft:#a5f3fc;
  --orange:#ff8a4c;
  --white:#f3f5fb;
  --muted:#a3aac8;
  --muted-2:#7b83a8;
  --radius-lg:20px;
  --radius-md:14px;
  --radius-sm:8px;
  --maxw:1180px;
  --shadow-1:0 20px 50px -20px rgba(0,0,0,0.55);
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(139,92,246,0.16), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(34,211,238,0.10), transparent 55%),
    var(--midnight);
  color:var(--white);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  line-height:1.75;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4,p{margin:0;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
section{position:relative;}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(10,14,36,0.86);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.nav-wrap{
  display:flex;align-items:center;justify-content:space-between;
  height:68px;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;letter-spacing:.5px;}
.brand img{width:34px;height:34px;}
.brand small{display:block;font-size:11px;font-weight:400;color:var(--muted-2);letter-spacing:1px;}
.main-nav{display:flex;align-items:center;gap:4px;}
.main-nav a{
  padding:9px 14px;border-radius:999px;font-size:14.5px;color:var(--muted);
  transition:.2s;white-space:nowrap;
}
.main-nav a:hover,.main-nav a.active{color:var(--white);background:var(--graphite-2);}
.nav-toggle{
  display:none;width:42px;height:42px;border-radius:10px;border:1px solid var(--line-strong);
  background:var(--graphite);align-items:center;justify-content:center;flex-direction:column;gap:4px;cursor:pointer;
}
.nav-toggle span{width:20px;height:2px;background:var(--white);display:block;}

/* ---------- Hero ---------- */
.hero{padding:64px 0 40px;}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--cyan-soft);
  background:rgba(34,211,238,0.08);border:1px solid rgba(34,211,238,0.25);
  padding:6px 14px;border-radius:999px;margin-bottom:18px;
}
.hero h1{font-size:clamp(28px,4.2vw,44px);line-height:1.3;font-weight:800;letter-spacing:.3px;}
.hero .lead{margin-top:18px;color:var(--muted);font-size:16.5px;max-width:56ch;}
.hero-actions{display:flex;gap:14px;margin-top:28px;flex-wrap:wrap;}
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:13px 24px;border-radius:12px;
  font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;transition:.2s;
}
.btn-primary{background:linear-gradient(135deg,var(--purple),#6d28d9);color:#fff;box-shadow:0 12px 30px -10px rgba(139,92,246,0.6);}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 16px 34px -10px rgba(139,92,246,0.75);}
.btn-ghost{background:var(--graphite);border-color:var(--line-strong);color:var(--white);}
.btn-ghost:hover{border-color:var(--purple-soft);}
.hero-art{border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--line);background:var(--graphite);}

/* ---------- 通用板块 ---------- */
.section{padding:56px 0;}
.section-tight{padding:40px 0;}
.section-head{max-width:760px;margin:0 0 30px;}
.tag{
  display:inline-block;font-size:12.5px;color:var(--purple-soft);
  background:rgba(139,92,246,0.1);border:1px solid rgba(139,92,246,0.28);
  padding:4px 12px;border-radius:999px;margin-bottom:14px;
}
.section-head h2{font-size:clamp(22px,3vw,30px);font-weight:800;letter-spacing:.2px;}
.section-head p{margin-top:12px;color:var(--muted);font-size:15.5px;}

/* ---------- 图表容器 ---------- */
.diagram{
  background:var(--graphite);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:22px;margin:28px 0;overflow-x:auto;
}
.diagram figcaption{margin-top:14px;font-size:13.5px;color:var(--muted-2);text-align:center;}
.diagram svg{width:100%;height:auto;display:block;min-width:280px;}

/* ---------- 文章 ---------- */
.article{
  background:var(--graphite);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:34px clamp(18px,4vw,40px);margin-bottom:26px;
}
.article-meta{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:14px;}
.article-cat{
  font-size:12.5px;color:var(--cyan-soft);background:rgba(34,211,238,0.08);
  border:1px solid rgba(34,211,238,0.25);padding:4px 12px;border-radius:999px;
}
.article-idx{font-size:12.5px;color:var(--muted-2);}
.article h3{font-size:clamp(19px,2.6vw,25px);font-weight:800;line-height:1.5;}
.article .content{margin-top:16px;color:var(--muted);font-size:15.5px;}
.article .content p{margin:0 0 15px;}
.article .content p:last-child{margin-bottom:0;}
.article .content strong{color:var(--white);}
.compare{
  display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:18px 0;
}
.compare div{background:var(--graphite-2);border:1px solid var(--line);border-radius:var(--radius-md);padding:14px 16px;}
.compare div b{display:block;color:var(--purple-soft);font-size:13.5px;margin-bottom:6px;letter-spacing:.3px;}
.compare div span{font-size:14px;color:var(--muted);}
.limit-box{
  border-left:3px solid var(--orange);background:rgba(255,138,76,0.07);
  padding:12px 16px;border-radius:0 var(--radius-sm) var(--radius-sm) 0;font-size:14.5px;color:var(--muted);margin-top:16px;
}
.limit-box b{color:var(--orange);}

/* ---------- 观察短文 ---------- */
.observe-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.observe-card{
  background:var(--graphite);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:24px;
}
.observe-card .tag{margin-bottom:10px;}
.observe-card h3{font-size:17px;font-weight:700;line-height:1.5;margin-bottom:10px;}
.observe-card p{font-size:14.5px;color:var(--muted);margin:0 0 10px;}

/* ---------- 摘要卡片网格 ---------- */
.summary-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.summary-card{
  background:var(--graphite);border:1px solid var(--line);border-radius:var(--radius-md);
  padding:20px;display:flex;flex-direction:column;gap:10px;transition:.2s;
}
.summary-card:hover{border-color:var(--purple-soft);transform:translateY(-2px);}
.summary-card .tag{align-self:flex-start;}
.summary-card h4{font-size:16px;font-weight:700;line-height:1.5;}
.summary-card p{font-size:14px;color:var(--muted);}
.summary-card .more{margin-top:auto;font-size:13.5px;color:var(--cyan-soft);}
.summary-foot{margin-top:18px;text-align:center;}

/* ---------- App 预览卡 ---------- */
.app-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;}
.app-card{
  background:var(--graphite);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:26px;
}
.app-card h3{font-size:18px;font-weight:800;margin-bottom:10px;}
.app-card p{color:var(--muted);font-size:14.5px;margin:0 0 10px;}

/* ---------- 功能网格（App 8 项） ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;}
.feature-item{
  background:var(--graphite);border:1px solid var(--line);border-radius:var(--radius-md);
  padding:18px;text-align:center;
}
.feature-item .num{
  width:30px;height:30px;border-radius:50%;background:rgba(139,92,246,0.15);
  color:var(--purple-soft);display:flex;align-items:center;justify-content:center;
  margin:0 auto 10px;font-size:13px;font-weight:700;border:1px solid rgba(139,92,246,0.35);
}
.feature-item h4{font-size:14px;font-weight:700;}

/* ---------- FAQ ---------- */
.faq-list{display:flex;flex-direction:column;gap:10px;}
.faq-item{background:var(--graphite);border:1px solid var(--line);border-radius:var(--radius-md);overflow:hidden;}
.faq-q{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:16px 20px;cursor:pointer;font-size:15px;font-weight:600;
}
.faq-q .plus{font-size:20px;color:var(--purple-soft);transition:transform .25s;flex:none;}
.faq-item.open .faq-q .plus{transform:rotate(45deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease;}
.faq-item.open .faq-a{max-height:600px;}
.faq-a p{padding:0 20px 18px;color:var(--muted);font-size:14.5px;margin:0;}

/* ---------- 公司介绍 / 声明 ---------- */
.about-box{
  background:var(--graphite);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:30px clamp(18px,4vw,40px);
}
.about-box h2{font-size:22px;font-weight:800;margin-bottom:16px;}
.about-box p{color:var(--muted);font-size:15px;margin:0 0 14px;}
.disclaimer{
  border:1px dashed var(--line-strong);border-radius:var(--radius-md);
  padding:18px 20px;font-size:13.5px;color:var(--muted-2);margin-top:18px;
}
.disclaimer + .disclaimer{margin-top:12px;}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--line);margin-top:40px;padding:44px 0 26px;background:var(--midnight-2);}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:32px;}
.footer-col h5{font-size:14px;color:var(--white);margin-bottom:14px;letter-spacing:.4px;}
.footer-col li{margin-bottom:9px;}
.footer-col a{color:var(--muted);font-size:14px;}
.footer-col a:hover{color:var(--cyan-soft);}
.footer-col p{color:var(--muted-2);font-size:13.5px;margin:0 0 8px;}
.footer-bottom{
  margin-top:34px;padding-top:20px;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;
  font-size:13px;color:var(--muted-2);
}

/* ---------- 面包屑 ---------- */
.breadcrumb{padding:16px 0 0;font-size:13px;color:var(--muted-2);}
.breadcrumb a{color:var(--muted-2);}
.breadcrumb a:hover{color:var(--cyan-soft);}
.breadcrumb span{margin:0 6px;}

/* ---------- 回到顶部 ---------- */
.back-top{
  position:fixed;right:22px;bottom:22px;width:46px;height:46px;border-radius:50%;
  background:var(--purple);color:#fff;border:none;display:none;align-items:center;justify-content:center;
  cursor:pointer;box-shadow:0 10px 24px -8px rgba(139,92,246,0.7);z-index:90;font-size:18px;
}
.back-top.show{display:flex;}

/* ---------- 匹配矩阵 / 关系图 tab ---------- */
.tabbar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px;}
.tabbar button{
  padding:8px 16px;border-radius:999px;border:1px solid var(--line-strong);
  background:var(--graphite-2);color:var(--muted);font-size:13.5px;cursor:pointer;transition:.2s;
}
.tabbar button.active{background:var(--purple);border-color:var(--purple);color:#fff;}
.tab-panel{display:none;}
.tab-panel.active{display:block;}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr;}
  .hero-art{order:-1;}
  .observe-grid,.summary-grid{grid-template-columns:repeat(2,1fr);}
  .app-grid{grid-template-columns:1fr;}
  .feature-grid{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:768px){
  .main-nav{
    position:fixed;top:68px;left:0;right:0;bottom:0;background:var(--midnight-2);
    flex-direction:column;align-items:stretch;padding:18px;gap:4px;
    transform:translateX(-100%);transition:transform .25s ease;overflow-y:auto;
  }
  .main-nav.open{transform:translateX(0);}
  .main-nav a{padding:14px 16px;font-size:16px;border-radius:12px;}
  .nav-toggle{display:flex;}
  .compare{grid-template-columns:1fr;}
  .observe-grid,.summary-grid{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr;}
}
@media (max-width:430px){
  .container{padding:0 16px;}
  .hero{padding:40px 0 28px;}
  .article{padding:24px 16px;}
  .feature-grid{grid-template-columns:1fr 1fr;}
}