/* ===================== 基础变量 ===================== */
:root{
  --bg:#eef2f8;
  --bg-alt:#e3ebf5;
  --surface:rgba(255,255,255,.72);
  --surface-2:rgba(255,255,255,.9);
  --border:rgba(30,60,110,.14);
  --text:#0f1b2d;
  --muted:#46566f;
  --water:#0ea5e9;          /* 玄青水 */
  --fire:#e11d48;           /* 朱砂火 */
  --primary:#0ea5e9;        /* 玄青 */
  --primary-2:#e11d48;      /* 朱砂 */
  --grad:linear-gradient(120deg,#0ea5e9,#e11d48);  /* 水火既济·落地版 */
  --glow:0 0 30px rgba(14,165,233,.16), 0 0 30px rgba(225,29,72,.10);
  --maxw:1180px;
  --radius:16px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--text);line-height:1.7;overflow-x:hidden;
  /* 水火既济·落地版：上方玄青水辉光 + 下方朱砂火辉光，阴阳平衡 */
  background:
    radial-gradient(ellipse 70% 44% at 50% -8%, rgba(14,165,233,.16), transparent 60%),
    radial-gradient(ellipse 70% 44% at 50% 110%, rgba(225,29,72,.16), transparent 60%),
    var(--bg);
  background-attachment:fixed;
}
a{color:inherit;text-decoration:none}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ===================== 按钮 ===================== */
.btn{display:inline-block;padding:12px 26px;border-radius:999px;font-weight:600;font-size:15px;cursor:pointer;border:1px solid transparent;transition:.25s}
.btn-primary{background:var(--grad);color:#04111f;box-shadow:var(--glow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 55px rgba(34,211,238,.5)}
.btn-ghost{border-color:var(--border);color:var(--text);background:var(--surface)}
.btn-ghost:hover{border-color:var(--primary-2);color:var(--primary-2)}
.btn.full{width:100%;text-align:center}

/* ===================== 导航 ===================== */
.navbar{position:fixed;top:0;left:0;right:0;z-index:100;transition:.3s;padding:18px 0}
.navbar.scrolled{background:rgba(238,242,248,.9);backdrop-filter:blur(14px);border-bottom:1px solid var(--border);padding:12px 0}
.nav-inner{display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:19px}
.logo-mark{font-size:22px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;filter:drop-shadow(0 0 10px rgba(56,189,248,.4))}
.nav-links{display:flex;gap:30px}
.nav-links a{color:var(--muted);font-size:15px;font-weight:500;transition:.2s;position:relative}
.nav-links a:hover{color:var(--text)}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:var(--grad);transition:.25s}
.nav-links a:hover::after{width:100%}
.nav-cta{padding:9px 20px;font-size:14px}
.nav-toggle{display:none;background:none;border:none;color:var(--text);font-size:24px;cursor:pointer}

/* ===================== Hero ===================== */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;padding:120px 0 60px;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0}
.grid-overlay{position:absolute;inset:0;background-image:linear-gradient(rgba(59,130,246,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(59,130,246,.08) 1px,transparent 1px);background-size:48px 48px;mask-image:radial-gradient(ellipse 80% 70% at 50% 40%,#000 30%,transparent 75%)}
.orb{position:absolute;border-radius:50%;filter:blur(80px);opacity:.55;animation:float 14s ease-in-out infinite}
.orb-1{width:440px;height:440px;background:#0ea5e9;top:-90px;left:-60px}      /* 水蓝 */
.orb-2{width:400px;height:400px;background:#f43f5e;bottom:-110px;right:-40px;animation-delay:-4s}  /* 火红 */
.orb-3{width:320px;height:320px;background:#8b5cf6;top:40%;left:55%;animation-delay:-8s}  /* 水火交融·紫 */
@keyframes float{0%,100%{transform:translate(0,0)}50%{transform:translate(30px,-40px)}}
.hero-inner{position:relative;z-index:1;max-width:820px}
.hero-tag{display:inline-block;padding:7px 16px;border:1px solid var(--border);border-radius:999px;font-size:13px;color:var(--primary-2);letter-spacing:2px;margin-bottom:22px;background:var(--surface)}
.hero-title{font-size:clamp(34px,5.5vw,60px);line-height:1.18;font-weight:800;letter-spacing:-1px}
.hero-sub{margin:24px 0 36px;color:var(--muted);font-size:18px;max-width:640px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.hero-stats{display:flex;gap:42px;margin-top:64px;flex-wrap:wrap}
.hstat{position:relative}
.hstat b{font-size:38px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hstat span{font-size:22px;color:var(--primary-2);font-weight:700;margin-left:2px}
.hstat p{color:var(--muted);font-size:14px;margin-top:2px}

/* ===================== 通用区块 ===================== */
.section{padding:100px 0}
.section-alt{background:var(--bg-alt)}
.section-head{text-align:center;max-width:720px;margin:0 auto 60px}
.eyebrow{display:inline-block;font-size:13px;letter-spacing:3px;color:var(--primary-2);font-weight:600;margin-bottom:14px}
.section-head h2{font-size:clamp(26px,3.4vw,40px);font-weight:800;letter-spacing:-.5px}
.section-head .section-sub{font-size:clamp(17px,2vw,22px);font-weight:700;color:var(--text);margin-top:10px}
.section-head p{color:var(--muted);margin-top:16px;font-size:16px}

/* ===================== 卡片 ===================== */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:34px 28px;transition:.3s;position:relative;overflow:hidden}
.card::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 50% 0,rgba(59,130,246,.18),transparent 60%);opacity:0;transition:.3s}
.card:hover{transform:translateY(-6px);border-color:rgba(34,211,238,.4);box-shadow:0 20px 50px rgba(0,0,0,.4)}
.card:hover::before{opacity:1}
.card-icon{font-size:34px;margin-bottom:18px;filter:drop-shadow(0 0 10px rgba(34,211,238,.4))}
.card h3{font-size:19px;margin-bottom:10px}
.card p{color:var(--muted);font-size:15px}

/* ===================== 关于 ===================== */
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center}
.about-text h2{font-size:clamp(26px,3.2vw,38px);font-weight:800;margin:14px 0 20px}
.about-text p{color:var(--muted);margin-bottom:16px;font-size:16px}
.about-badges{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
.badge{padding:8px 16px;border:1px solid var(--border);border-radius:999px;font-size:13px;color:var(--text);background:var(--surface)}
.about-visual{display:flex;justify-content:center;align-items:center;min-height:340px}
.glow-box{position:relative;width:300px;height:300px;display:flex;align-items:center;justify-content:center}
.ring{position:absolute;inset:0;border:1px solid var(--border);border-radius:50%;border-top-color:var(--primary-2);animation:spin 8s linear infinite}
.ring-2{inset:30px;border-top-color:var(--primary);animation-duration:12s;animation-direction:reverse}
.core{text-align:center;font-weight:800;font-size:28px;letter-spacing:1px}
.core small{display:block;font-size:14px;color:var(--muted);font-weight:500;letter-spacing:3px;margin-top:6px}
@keyframes spin{to{transform:rotate(360deg)}}

/* ===================== 数据 ===================== */
.stats-section{background:linear-gradient(180deg,var(--bg),var(--bg-alt))}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.stat-box{text-align:center;padding:40px 20px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface)}
.stat-box b{font-size:clamp(36px,5vw,56px);font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat-box span{font-size:26px;color:var(--primary-2);font-weight:700}
.stat-box p{color:var(--muted);margin-top:8px;font-size:15px}

/* ===================== 特性 ===================== */
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.feature{padding:30px 24px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);transition:.3s}
.feature:hover{border-color:rgba(34,211,238,.4);transform:translateY(-4px)}
.feature-no{font-size:30px;font-weight:800;color:transparent;background:var(--grad);-webkit-background-clip:text;background-clip:text;margin-bottom:12px}
.feature h3{font-size:18px;margin-bottom:8px}
.feature p{color:var(--muted);font-size:14px}

/* ===================== 流程 ===================== */
.timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;position:relative}
.timeline::before{content:"";position:absolute;top:24px;left:12%;right:12%;height:2px;background:linear-gradient(90deg,var(--primary),var(--primary-2));opacity:.4}
.step{text-align:center;position:relative;z-index:1}
.step-dot{width:50px;height:50px;margin:0 auto 18px;border-radius:50%;background:var(--bg);border:2px solid var(--primary-2);display:flex;align-items:center;justify-content:center;font-weight:800;color:var(--primary-2);box-shadow:0 0 20px rgba(34,211,238,.3)}
.step h3{font-size:17px;margin-bottom:8px}
.step p{color:var(--muted);font-size:14px}

/* ===================== 联系 ===================== */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:54px;align-items:start}
.contact-info h2{font-size:clamp(26px,3.2vw,38px);font-weight:800;margin:12px 0 14px}
.contact-lead{color:var(--muted);margin-bottom:28px}
.contact-list{list-style:none;display:flex;flex-direction:column;gap:18px}
.contact-list li{display:flex;flex-direction:column;gap:4px;padding-bottom:16px;border-bottom:1px solid var(--border)}
.contact-list span{font-size:13px;color:var(--primary-2);letter-spacing:1px}
.contact-list a,.contact-list p{font-size:16px;color:var(--text)}
.contact-form{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:32px;box-shadow:0 12px 32px rgba(20,40,80,.07)}
.field{margin-bottom:18px}
.field label{display:block;font-size:14px;margin-bottom:8px;color:var(--muted)}
.field input,.field select,.field textarea{width:100%;padding:12px 14px;background:var(--bg);border:1px solid var(--border);border-radius:10px;color:var(--text);font-size:15px;font-family:inherit;transition:.2s}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--primary-2);box-shadow:0 0 0 3px rgba(34,211,238,.15)}
.form-note{font-size:12px;color:var(--muted);margin-top:12px;line-height:1.6}

/* ===================== 页脚 ===================== */
.footer{border-top:1px solid var(--border);background:var(--bg-alt)}
.footer-inner{display:grid;grid-template-columns:1fr;gap:40px;padding:60px 0 40px}
.footer-brand-solo{text-align:center}
.footer-brand-solo .logo{justify-content:center}
.footer-brand-solo p{margin-left:auto;margin-right:auto}
.footer-brand p{color:var(--muted);font-size:14px;margin-top:14px;max-width:380px}
.footer-links h4{font-size:15px;margin-bottom:16px}
.footer-links a,.footer-links p{display:block;color:var(--muted);font-size:14px;margin-bottom:10px;transition:.2s}
.footer-links a:hover{color:var(--primary-2)}
.footer-bottom{border-top:1px solid var(--border);padding:22px 0;text-align:center}
.footer-bottom p{color:var(--muted);font-size:13px}
.beian a{color:var(--muted)}
.beian a:hover{color:var(--primary-2)}

/* ===================== 动画 ===================== */
.reveal{opacity:0;transform:translateY(28px);transition:.7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* ===================== 响应式 ===================== */
@media(max-width:920px){
  .cards,.features,.stats-grid,.timeline{grid-template-columns:repeat(2,1fr)}
  .about-grid,.contact-grid{grid-template-columns:1fr;gap:40px}
  .footer-inner{grid-template-columns:1fr 1fr}
  .timeline::before{display:none}
}
@media(max-width:680px){
  .nav-links{position:fixed;top:64px;right:0;width:70%;max-width:300px;height:calc(100vh - 64px);background:rgba(238,242,248,.97);flex-direction:column;padding:30px;gap:22px;transform:translateX(100%);transition:.3s;border-left:1px solid var(--border)}
  .nav-links.open{transform:translateX(0)}
  .nav-toggle{display:block}
  .nav-cta{display:none}
  .cards,.features,.stats-grid,.timeline{grid-template-columns:1fr}
  .hero-stats{gap:26px}
  .footer-inner{grid-template-columns:1fr}
  .section{padding:70px 0}
  .logo{font-size:16px}
  .hero-title{font-size:clamp(30px,8vw,42px)}
  .hero-sub{font-size:16px}
  .hstat b{font-size:30px}
  .hstat span{font-size:18px}
  .about-visual{min-height:260px}
  .glow-box{width:240px;height:240px}
  .contact-grid{gap:36px}
  .contact-form{padding:24px}
}
@media(max-width:380px){
  .hero-stats{gap:18px}
  .hstat b{font-size:26px}
  .container{padding:0 18px}
}

/* ===================== 仅「明」主题（水火既济·落地版）已作为全站唯一默认配色，无暗色与切换 ===================== */