:root{
  --bg:#ffffff;
  --text:#111827;
  --text-soft:#4b5563;
  --muted:#6b7280;
  --line:#e8ecf4;
  --primary:#4f7cff;
  --primary-dark:#3a63dd;
  --accent:#8b5cf6;
  --soft:#f6f8ff;
  --radius:16px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:15px;line-height:1.7;-webkit-font-smoothing:antialiased;
}
a{text-decoration:none;color:inherit}
h1,h2,h3,p{margin:0}
.container{width:100%;max-width:1140px;margin:0 auto;padding:0 24px}

/* 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 rgba(232,236,244,.9);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px;gap:20px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:16px;letter-spacing:-.01em}
.logo-mark{
  width:34px;height:34px;border-radius:10px;display:grid;place-items:center;color:#fff;font-weight:800;
  background:linear-gradient(135deg,var(--primary),var(--accent));box-shadow:0 4px 12px rgba(79,124,255,.35);
}
.nav-links{display:flex;align-items:center;gap:22px;font-size:14px;color:var(--text-soft)}
.nav-links a:hover{color:var(--text)}
.nav-user{font-size:13px;color:var(--muted)}
.nav-login{font-weight:500}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:42px;padding:0 20px;border-radius:11px;font-size:14px;font-weight:600;
  border:1px solid transparent;cursor:pointer;transition:.18s;white-space:nowrap;
}
.btn-primary{background:linear-gradient(135deg,var(--primary),#6b5cf6);color:#fff;box-shadow:0 8px 20px rgba(79,124,255,.25)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 12px 26px rgba(79,124,255,.32)}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--text-soft)}
.btn-ghost:hover{border-color:#c9d3e8;color:var(--text)}
.btn-sm{height:36px;padding:0 15px;font-size:13px;border-radius:9px}
.btn-lg{height:48px;padding:0 26px;font-size:15px;border-radius:12px}

/* 提示 */
.flash-wrap{padding-top:16px}
.flash{padding:12px 16px;border-radius:11px;font-size:14px;margin-bottom:10px}
.flash-success{background:#ecfdf3;color:#067647;border:1px solid #c9f0dc}
.flash-error{background:#fef3f2;color:#b42318;border:1px solid #fbd5d2}

/* Hero */
.hero{position:relative;overflow:hidden;padding:72px 0 84px}
.hero::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(760px 420px at 12% -6%,rgba(79,124,255,.14),transparent 62%),
    radial-gradient(700px 460px at 92% 8%,rgba(139,92,246,.12),transparent 60%),
    linear-gradient(180deg,#fbfcff 0%,#ffffff 78%);
}
.hero-inner{display:grid;grid-template-columns:1.15fr .85fr;gap:60px;align-items:center}
.pill{
  display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:600;
  color:var(--primary);background:rgba(79,124,255,.08);border:1px solid rgba(79,124,255,.16);
  padding:5px 13px;border-radius:99px;
}
.pill i{width:6px;height:6px;border-radius:50%;background:var(--primary);box-shadow:0 0 0 4px rgba(79,124,255,.14)}
h1{
  font-size:clamp(34px,4.6vw,54px);line-height:1.18;letter-spacing:-.03em;
  font-weight:800;margin:20px 0 16px;
}
.grad{background:linear-gradient(120deg,var(--primary) 10%,var(--accent) 90%);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{font-size:17px;color:var(--text-soft);margin-bottom:10px}
.hero-desc{font-size:14.5px;color:var(--muted);max-width:520px}
.hero-actions{display:flex;gap:12px;margin-top:28px;flex-wrap:wrap}
.hero-note{display:flex;gap:22px;margin-top:24px;font-size:13px;color:var(--muted);flex-wrap:wrap}

/* Hero 卡片 */
.hero-card{
  background:#fff;border:1px solid var(--line);border-radius:20px;overflow:hidden;
  box-shadow:0 24px 60px rgba(23,37,84,.10);transform:rotate(.4deg);
}
.hc-head{display:flex;align-items:center;gap:10px;padding:14px 18px;border-bottom:1px solid var(--line);background:#fbfcff}
.hc-dots{display:flex;gap:5px}
.hc-dots i{width:8px;height:8px;border-radius:50%;background:#e3e8f2}
.hc-dots i:first-child{background:#ffd1d1}
.hc-dots i:nth-child(2){background:#ffe8bd}
.hc-dots i:nth-child(3){background:#c9f0dc}
.hc-title{font-size:12.5px;color:var(--muted);font-weight:500}
.hc-body{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border-bottom:1px solid var(--line)}
.hc-stat{background:#fff;padding:18px 20px}
.hc-stat span{display:block;font-size:12px;color:var(--muted)}
.hc-stat strong{display:block;font-size:26px;font-weight:750;letter-spacing:-.02em;margin-top:2px}
.hc-list{padding:16px 18px 6px}
.hc-list-title{font-size:11.5px;color:var(--muted);letter-spacing:.06em;text-transform:uppercase;margin-bottom:10px}
.hc-row{display:flex;align-items:center;gap:10px;padding:8px 0}
.hc-avatar{
  width:28px;height:28px;border-radius:50%;display:grid;place-items:center;flex:0 0 28px;
  background:linear-gradient(135deg,#eef3ff,#f4eeff);color:var(--primary);font-size:12px;font-weight:700;text-transform:uppercase;
}
.hc-name{font-size:13px;font-weight:500;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.hc-time{font-size:11.5px;color:#9aa4b5}
.hc-empty{font-size:12.5px;color:var(--muted);padding:10px 0 16px}
.hc-foot{
  display:flex;align-items:center;gap:8px;padding:12px 18px;border-top:1px solid var(--line);
  background:#fbfcff;font-size:12px;color:var(--muted);
}
.dot-live{width:6px;height:6px;border-radius:50%;background:#22c55e;box-shadow:0 0 0 3px rgba(34,197,94,.15)}

/* 特性 */
.features{padding:26px 0 72px}
.section-head{text-align:center;max-width:620px;margin:0 auto 40px}
.section-head h2{font-size:clamp(24px,3vw,32px);font-weight:750;letter-spacing:-.02em}
.section-head p{color:var(--muted);margin-top:10px;font-size:14.5px}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feature{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;
  transition:.2s;
}
.feature:hover{transform:translateY(-3px);box-shadow:0 18px 40px rgba(23,37,84,.08);border-color:#dbe3f3}
.feature-ico{
  width:44px;height:44px;border-radius:12px;display:grid;place-items:center;font-size:19px;
  background:linear-gradient(135deg,#eef3ff,#f6f0ff);color:var(--primary);margin-bottom:16px;
}
.feature h3{font-size:16px;font-weight:700;margin-bottom:8px}
.feature p{font-size:13.5px;color:var(--muted);line-height:1.75}

/* 数据条 */
.stats{padding:0 0 84px}
.stats-inner{
  background:linear-gradient(120deg,#101a33,#1c2650 55%,#2a1e4d);border-radius:22px;
  padding:40px 42px;display:flex;align-items:center;justify-content:space-between;gap:40px;
  color:#fff;box-shadow:0 24px 60px rgba(16,26,51,.22);flex-wrap:wrap;
}
.stats-text h2{font-size:23px;font-weight:700;letter-spacing:-.01em}
.stats-text p{font-size:13.5px;color:#a9b4cc;margin-top:8px;max-width:420px}
.stats-nums{display:flex;gap:44px}
.stats-nums strong{display:block;font-size:30px;font-weight:750;letter-spacing:-.02em;background:linear-gradient(120deg,#fff,#b9c7ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.stats-nums span{font-size:12px;color:#93a0bd}

/* 页脚 */
.footer{border-top:1px solid var(--line);background:#fbfcff;padding:36px 0 22px}
.footer-inner{display:flex;align-items:flex-start;justify-content:space-between;gap:24px;flex-wrap:wrap}
.footer strong{font-size:15px}
.footer p{font-size:12.5px;color:var(--muted);margin-top:4px}
.footer-links{display:flex;gap:22px;font-size:13px;color:var(--text-soft);flex-wrap:wrap}
.footer-links a:hover{color:var(--primary)}
.icp{font-size:12px;color:#9aa4b5;margin-top:18px;padding-top:16px;border-top:1px solid var(--line)}

@media (max-width:960px){
  .hero-inner{grid-template-columns:1fr;gap:44px}
  .hero-card{transform:none;max-width:480px}
  .feature-grid{grid-template-columns:1fr}
  .stats-inner{padding:32px 26px;gap:26px}
  .stats-nums{gap:30px}
  .nav-links a:not(.btn){display:none}
}
@media (max-width:560px){
  .hero{padding:48px 0 60px}
  h1{font-size:32px}
  .hero-actions .btn{width:100%}
  .stats-nums{width:100%;justify-content:space-between;gap:12px}
  .stats-nums strong{font-size:24px}
  .footer-inner{flex-direction:column}
}