/* =========================================================
   QChat 官网首页 — 视觉系统（对齐小程序 v2.0 设计文档）
   主色 #0C447C / 辅色 #185FA5 / 成功 #1D9E75 / 付费 #D85A30
   ========================================================= */
:root{
  --primary:#0C447C;
  --primary-2:#185FA5;
  --teal:#1D9E75;
  --coral:#D85A30;
  --bg:#F6F6F6;
  --card:#FFFFFF;
  --ink:#2C2C2A;
  --ink-2:#5F5E5A;
  --ink-3:#888780;
  --line:#E8E8E6;
  --grad:linear-gradient(135deg,#0C447C 0%,#185FA5 100%);
  --grad-soft:linear-gradient(135deg,#0C447C 0%,#185FA5 55%,#1D9E75 130%);
  --shadow-sm:0 2px 12px rgba(12,68,124,.06);
  --shadow-md:0 8px 24px rgba(12,68,124,.12);
  --shadow-lg:0 18px 48px rgba(12,68,124,.18);
  --radius:18px;
  --radius-sm:12px;
  --maxw:1180px;
  --font:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--ink);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
section{position:relative}

/* ---------- 导航 ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.82);
  backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px;color:var(--primary);letter-spacing:.3px}
.brand .mark{width:32px;height:32px;border-radius:9px;background:var(--grad);display:grid;place-items:center;box-shadow:var(--shadow-sm)}
.brand .mark svg{width:18px;height:18px}
.nav-links{display:flex;gap:30px;align-items:center}
.nav-links a{font-size:15px;color:var(--ink-2);font-weight:500;transition:color .2s}
.nav-links a:hover{color:var(--primary)}
.nav-cta{display:flex;align-items:center;gap:14px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:12px;font-weight:600;font-size:15px;cursor:pointer;
  padding:11px 22px;border:1px solid transparent;transition:all .2s;white-space:nowrap;
}
.btn-primary{background:var(--primary);color:#fff;box-shadow:var(--shadow-sm)}
.btn-primary:hover{background:var(--primary-2);transform:translateY(-1px);box-shadow:var(--shadow-md)}
.btn-ghost{background:#fff;color:var(--primary);border:1px solid var(--primary)}
.btn-ghost:hover{background:#F0F4F8}
.btn-light{background:rgba(255,255,255,.16);color:#fff;border:1px solid rgba(255,255,255,.4)}
.btn-light:hover{background:rgba(255,255,255,.28)}
.btn-lg{padding:14px 30px;font-size:16px}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;width:40px;height:40px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--ink);margin:5px auto;transition:.3s}

/* ---------- Hero ---------- */
.hero{padding:64px 0 72px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:54px;align-items:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  background:#EAF1F8;color:var(--primary-2);
  font-size:13px;font-weight:600;padding:7px 14px;border-radius:999px;margin-bottom:22px;
}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--teal);box-shadow:0 0 0 4px rgba(29,158,117,.18)}
.hero h1{
  font-size:46px;line-height:1.22;font-weight:800;letter-spacing:-.5px;color:var(--ink);
  margin-bottom:20px;
}
.hero h1 .hl{
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero p.lead{font-size:18px;color:var(--ink-2);max-width:520px;margin-bottom:30px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:34px}
.hero-stats{display:flex;gap:34px}
.hero-stats .s b{display:block;font-size:26px;font-weight:800;color:var(--primary)}
.hero-stats .s span{font-size:13px;color:var(--ink-3)}

/* Hero 群聊视觉 */
.chat-card{
  background:#fff;border-radius:22px;box-shadow:var(--shadow-lg);
  border:1px solid var(--line);overflow:hidden;
}
.chat-head{
  background:var(--grad);color:#fff;padding:16px 20px;display:flex;align-items:center;gap:12px;
}
.chat-head .ava{width:38px;height:38px;border-radius:11px;background:rgba(255,255,255,.2);display:grid;place-items:center;font-weight:700;font-size:15px}
.chat-head .meta b{font-size:15px;display:block;line-height:1.2}
.chat-head .meta span{font-size:12px;opacity:.82}
.chat-head .live{margin-left:auto;font-size:12px;background:rgba(255,255,255,.18);padding:4px 10px;border-radius:999px;display:flex;align-items:center;gap:6px}
.chat-head .live i{width:7px;height:7px;border-radius:50%;background:var(--teal);box-shadow:0 0 0 3px rgba(29,158,117,.35);display:inline-block}
.chat-body{padding:18px 18px 22px;background:#FBFCFE;display:flex;flex-direction:column;gap:14px;min-height:330px}
.msg{display:flex;gap:10px;align-items:flex-start;max-width:92%}
.msg .av{width:34px;height:34px;border-radius:10px;flex:0 0 34px;display:grid;place-items:center;color:#fff;font-size:14px;font-weight:700}
.msg .bubble{background:#fff;border:1px solid var(--line);border-radius:4px 14px 14px 14px;padding:9px 13px;box-shadow:var(--shadow-sm)}
.msg .nm{font-size:12px;font-weight:700;margin-bottom:2px}
.msg .tx{font-size:13.5px;color:var(--ink)}
.msg.me{align-self:flex-end;flex-direction:row-reverse}
.msg.me .bubble{background:var(--primary);color:#fff;border:none;border-radius:14px 4px 14px 14px}
.msg.me .nm{color:#fff;opacity:.85;text-align:right}
.typing{display:flex;gap:10px;align-items:center;color:var(--ink-3);font-size:13px}
.typing .dots{display:flex;gap:4px}
.typing .dots i{width:6px;height:6px;border-radius:50%;background:var(--ink-3);animation:tb 1.2s infinite}
.typing .dots i:nth-child(2){animation-delay:.2s}.typing .dots i:nth-child(3){animation-delay:.4s}
@keyframes tb{0%,60%,100%{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-4px)}}

/* ---------- 通用区块标题 ---------- */
.section{padding:76px 0}
.section.alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{text-align:center;max-width:680px;margin:0 auto 50px}
.kicker{color:var(--primary-2);font-weight:700;font-size:14px;letter-spacing:1px;text-transform:uppercase;margin-bottom:12px}
.sec-head h2{font-size:34px;font-weight:800;letter-spacing:-.4px;margin-bottom:14px}
.sec-head p{font-size:17px;color:var(--ink-2)}

/* ---------- 功能网格 ---------- */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feat{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 26px;
  box-shadow:var(--shadow-sm);transition:transform .25s,box-shadow .25s,border-color .25s;
}
.feat:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:#D7E2EE}
.feat .ic{width:48px;height:48px;border-radius:13px;background:#EAF1F8;display:grid;place-items:center;margin-bottom:18px;color:var(--primary)}
.feat .ic svg{width:24px;height:24px}
.feat h3{font-size:18px;font-weight:700;margin-bottom:8px}
.feat p{font-size:14.5px;color:var(--ink-2)}

/* ---------- Agent 角色墙 ---------- */
.agent-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.agent{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 20px;
  box-shadow:var(--shadow-sm);transition:transform .25s,box-shadow .25s;position:relative;overflow:hidden;
}
.agent::before{content:"";position:absolute;inset:0 0 auto 0;height:4px;background:var(--ac,#0C447C)}
.agent:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.agent .top{display:flex;align-items:center;gap:13px;margin-bottom:14px}
.agent .av{width:50px;height:50px;border-radius:14px;flex:0 0 50px;display:grid;place-items:center;color:#fff;font-size:20px;font-weight:700;box-shadow:var(--shadow-sm)}
.agent .nm{font-size:17px;font-weight:700}
.agent .role{font-size:12.5px;color:var(--ink-3);margin-top:1px}
.agent .cap{display:inline-block;font-size:12px;font-weight:600;color:var(--primary-2);background:#EAF1F8;padding:4px 10px;border-radius:999px;margin-bottom:12px}
.agent .desc{font-size:13.5px;color:var(--ink-2);min-height:42px}
.tag-hot{position:absolute;top:14px;right:14px;font-size:11px;font-weight:700;color:#fff;background:var(--coral);padding:3px 9px;border-radius:999px}

/* ---------- 双特性（Q视频 / 社区） ---------- */
.duo{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.panel{
  border-radius:var(--radius);padding:38px 36px;color:#fff;position:relative;overflow:hidden;
  box-shadow:var(--shadow-md);min-height:240px;display:flex;flex-direction:column;justify-content:flex-end;
}
.panel.blue{background:linear-gradient(135deg,#0C447C,#185FA5)}
.panel.teal{background:linear-gradient(135deg,#15795B,#1D9E75)}
.panel .ptag{font-size:13px;opacity:.85;font-weight:600;margin-bottom:8px}
.panel h3{font-size:26px;font-weight:800;margin-bottom:10px}
.panel p{font-size:15px;opacity:.92;max-width:420px}
.panel .deco{position:absolute;right:-30px;top:-30px;width:180px;height:180px;border-radius:50%;background:rgba(255,255,255,.1)}
.panel .deco2{position:absolute;right:40px;bottom:-50px;width:120px;height:120px;border-radius:30px;background:rgba(255,255,255,.08);transform:rotate(15deg)}

/* ---------- 场景 ---------- */
.scn-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.scn{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;box-shadow:var(--shadow-sm);transition:.25s}
.scn:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.scn .n{width:40px;height:40px;border-radius:11px;background:var(--grad);color:#fff;display:grid;place-items:center;font-weight:800;margin-bottom:16px}
.scn h3{font-size:17px;font-weight:700;margin-bottom:7px}
.scn p{font-size:14px;color:var(--ink-2)}

/* ---------- 价格 ---------- */
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;align-items:stretch}
.plan{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px 28px;
  box-shadow:var(--shadow-sm);display:flex;flex-direction:column;position:relative;
}
.plan.feature{border:2px solid var(--primary);box-shadow:var(--shadow-md)}
.plan .flag{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:var(--grad);color:#fff;font-size:12.5px;font-weight:700;padding:5px 16px;border-radius:999px;box-shadow:var(--shadow-sm)}
.plan .pname{font-size:15px;font-weight:700;color:var(--primary-2);letter-spacing:.5px}
.plan .price{font-size:40px;font-weight:800;margin:10px 0 2px;color:var(--ink)}
.plan .price small{font-size:15px;font-weight:600;color:var(--ink-3)}
.plan .pdesc{font-size:13.5px;color:var(--ink-3);margin-bottom:20px;min-height:38px}
.plan ul{list-style:none;display:flex;flex-direction:column;gap:11px;margin-bottom:24px;flex:1}
.plan li{font-size:14px;color:var(--ink-2);display:flex;align-items:flex-start;gap:9px}
.plan li svg{width:17px;height:17px;flex:0 0 17px;color:var(--teal);margin-top:3px}
.plan .btn{width:100%}

/* ---------- CTA 带 ---------- */
.cta-band{padding:0 0 80px}
.cta-inner{
  background:var(--grad-soft);border-radius:26px;padding:56px 48px;text-align:center;color:#fff;
  box-shadow:var(--shadow-lg);position:relative;overflow:hidden;
}
.cta-inner::after{content:"";position:absolute;left:-60px;bottom:-80px;width:260px;height:260px;border-radius:50%;background:rgba(255,255,255,.08)}
.cta-inner::before{content:"";position:absolute;right:-40px;top:-70px;width:200px;height:200px;border-radius:40px;background:rgba(255,255,255,.07);transform:rotate(18deg)}
.cta-inner h2{font-size:32px;font-weight:800;margin-bottom:12px;position:relative}
.cta-inner p{font-size:17px;opacity:.92;margin-bottom:28px;position:relative}
.cta-inner .hero-actions{justify-content:center;position:relative}

/* ---------- 体验区（二维码占位） ---------- */
.try-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.try-copy h2{font-size:30px;font-weight:800;margin-bottom:14px}
.try-copy p{font-size:16px;color:var(--ink-2);margin-bottom:20px}
.try-steps{display:flex;flex-direction:column;gap:14px;margin-bottom:8px}
.try-steps .st{display:flex;gap:12px;align-items:flex-start}
.try-steps .st .n{width:26px;height:26px;flex:0 0 26px;border-radius:50%;background:var(--primary);color:#fff;font-size:13px;font-weight:700;display:grid;place-items:center}
.try-steps .st div{font-size:14.5px;color:var(--ink-2)}
.qr-box{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;
  box-shadow:var(--shadow-md);text-align:center;max-width:300px;margin:0 auto;
}
.qr-box .qr{
  width:200px;height:200px;margin:0 auto 14px;border-radius:14px;
  background:
    repeating-conic-gradient(#0C447C 0% 25%, #fff 0% 50%) 0/28px 28px;
  border:1px solid var(--line);display:grid;place-items:center;color:var(--primary);font-size:13px;font-weight:600;text-align:center;padding:10px;
}
.qr-box .cap{font-size:13.5px;color:var(--ink-2);font-weight:600}
.qr-box .sub{font-size:12px;color:var(--ink-3);margin-top:4px}
.note-inline{font-size:12.5px;color:var(--ink-3);margin-top:14px;background:#F0F4F8;padding:10px 14px;border-radius:10px}

/* ---------- 页脚 ---------- */
.footer{background:#0B1F33;color:#C7D2DE;padding:54px 0 30px}
.footer .fg{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px;margin-bottom:36px}
.footer .brand{color:#fff;margin-bottom:14px}
.footer .fdesc{font-size:14px;color:#9FB0C0;max-width:300px}
.footer h4{color:#fff;font-size:14px;margin-bottom:16px;font-weight:700}
.footer ul{list-style:none;display:flex;flex-direction:column;gap:10px}
.footer ul a{font-size:14px;color:#9FB0C0;transition:.2s}
.footer ul a:hover{color:#fff}
.footer .fb{display:flex;align-items:center;justify-content:space-between;border-top:1px solid #1B3247;padding-top:22px;font-size:13px;color:#7E90A2;flex-wrap:wrap;gap:10px}
.footer .fb a{color:#7E90A2}
.footer .fb a:hover{color:#fff}
.footer .beian{display:flex;align-items:center;gap:22px;flex-wrap:wrap;margin-top:14px;padding-top:16px;border-top:1px solid #1B3247;font-size:13px;color:#7E90A2}
.footer .beian a{display:inline-flex;align-items:center;gap:6px;color:#7E90A2;text-decoration:none}
.footer .beian a:hover{color:#fff}
.footer .beian-ico{width:14px;height:14px;display:inline-block;object-fit:contain;vertical-align:middle}

/* ---------- 滚动揭示 ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media(max-width:980px){
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .feat-grid{grid-template-columns:repeat(2,1fr)}
  .agent-grid{grid-template-columns:repeat(2,1fr)}
  .scn-grid{grid-template-columns:repeat(2,1fr)}
  .price-grid{grid-template-columns:1fr}
  .duo{grid-template-columns:1fr}
  .try-grid{grid-template-columns:1fr;text-align:center}
  .try-steps{align-items:flex-start;text-align:left;max-width:320px;margin:0 auto 8px}
  .footer .fg{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .nav-links,.nav-cta .btn-ghost{display:none}
  .nav-toggle{display:block}
  .nav-links.open{display:flex;position:absolute;top:66px;left:0;right:0;background:#fff;flex-direction:column;gap:0;padding:8px 0;border-bottom:1px solid var(--line);box-shadow:var(--shadow-md)}
  .nav-links.open a{padding:13px 24px}
  .hero h1{font-size:34px}
  .sec-head h2{font-size:27px}
  .feat-grid,.agent-grid,.scn-grid{grid-template-columns:1fr}
  .hero-stats{gap:22px}
  .wrap{padding:0 18px}
  .section{padding:54px 0}
}