:root{
  --blue-600:#1d4ed8; --blue-700:#1e40af; --blue-50:#eff4ff;
  --ink:#0f172a; --gray:#64748b; --line:#e2e8f0; --bg:#ffffff;
  --radius:14px; --shadow:0 8px 30px rgba(15,23,42,.08);
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7}
.container{max-width:1120px;margin:0 auto;padding:0 24px}
a{text-decoration:none;color:inherit}

/* 导航 */
.nav{position:sticky;top:0;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);z-index:100}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px}
.logo-mark{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,var(--blue-600),#38bdf8);display:inline-block}
.nav-links{display:flex;gap:32px}
.nav-links a{font-size:15px;color:var(--gray);transition:color .2s}
.nav-links a:hover,.nav-links a.active{color:var(--blue-600);font-weight:600}
.menu-btn{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.menu-btn span{width:22px;height:2px;background:var(--ink);border-radius:2px;transition:.3s}
.menu-btn.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-btn.open span:nth-child(2){opacity:0}
.menu-btn.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* Hero */
.hero{padding:110px 0 90px;background:linear-gradient(160deg,#f8fafc 0%,var(--blue-50) 100%)}
.hero-tag{display:inline-block;font-size:13px;color:var(--blue-600);background:#fff;border:1px solid #c7d7fe;border-radius:999px;padding:4px 14px;margin-bottom:20px}
.hero h1{font-size:44px;line-height:1.25;letter-spacing:-.5px}
.hero-sub{margin:20px 0 32px;max-width:560px;color:var(--gray);font-size:17px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}

/* 按钮 */
.btn{display:inline-block;padding:12px 28px;border-radius:10px;font-size:15px;transition:.25s;cursor:pointer;border:none}
.btn-primary{background:var(--blue-600);color:#fff}
.btn-primary:hover{background:var(--blue-700);transform:translateY(-2px);box-shadow:0 8px 20px rgba(29,78,216,.3)}
.btn-ghost{background:#fff;color:var(--blue-600);border:1px solid #c7d7fe}
.btn-ghost:hover{border-color:var(--blue-600)}
.btn-block{width:100%}

/* 区块 */
.section{padding:80px 0}
.section-alt{background:#f8fafc}
.section-title{font-size:30px;text-align:center;margin-bottom:12px}
.section-title.left{text-align:left}
.section-desc{text-align:center;color:var(--gray);margin-bottom:48px}
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:1fr 1fr}
.grid-4{grid-template-columns:repeat(4,1fr)}

/* 统计 */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat strong{font-size:34px;color:var(--blue-600);display:block}
.stat strong span{font-size:16px;margin-left:2px}
.stat p{color:var(--gray);font-size:14px;margin-top:4px}

/* 卡片 */
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px 28px;transition:.3s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#c7d7fe}
.card-icon{width:46px;height:46px;border-radius:12px;background:var(--blue-50);color:var(--blue-600);font-size:22px;display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.card h3{font-size:18px;margin-bottom:10px}
.card p{color:var(--gray);font-size:14.5px}

/* 页头 */
.page-hero{padding:80px 0;background:linear-gradient(160deg,#f8fafc,var(--blue-50));text-align:center}
.page-hero h1{font-size:38px}
.page-hero p{color:var(--gray);margin-top:10px}

/* 企业信息卡 */
.fact-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px}
.fact-card h3{margin-bottom:18px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.fact-card dl{display:grid;grid-template-columns:auto 1fr;gap:10px 20px;font-size:14.5px}
.fact-card dt{color:var(--gray);white-space:nowrap}
.fact-card dd{font-weight:500}

/* 时间线 */
.timeline{max-width:640px;margin:0 auto}
.tl-item{display:flex;gap:24px;padding:24px 0;border-bottom:1px solid var(--line)}
.tl-item:last-child{border-bottom:none}
.tl-year{flex-shrink:0;width:72px;font-weight:700;color:var(--blue-600);font-size:18px}
.tl-item h3{font-size:17px;margin-bottom:4px}
.tl-item p{color:var(--gray);font-size:14.5px}

/* 步骤 */
.step{text-align:center;padding:24px 16px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}
.step span{font-size:26px;font-weight:800;color:#c7d7fe}
.step h3{margin:8px 0 6px;font-size:16px}
.step p{color:var(--gray);font-size:13.5px}

/* CTA */
.cta-box{background:linear-gradient(135deg,var(--blue-600),var(--blue-700));border-radius:20px;padding:56px 40px;text-align:center;color:#fff}
.cta-box h2{font-size:28px;margin-bottom:10px}
.cta-box p{opacity:.85;margin-bottom:26px}
.cta-box .btn-primary{background:#fff;color:var(--blue-600)}
.cta-box .btn-primary:hover{box-shadow:0 8px 20px rgba(0,0,0,.2)}

/* 联系页 */
.contact-item{padding:18px 0;border-bottom:1px solid var(--line)}
.contact-item strong{display:block;color:var(--blue-600);font-size:14px;margin-bottom:4px}
.contact-item p{color:var(--ink);font-size:15px}
.contact-form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow)}
.contact-form h3{margin-bottom:20px}
.contact-form label{display:block;font-size:14px;font-weight:600;margin-bottom:16px}
.contact-form input,.contact-form textarea{width:100%;margin-top:6px;padding:11px 14px;border:1px solid var(--line);border-radius:9px;font-size:14px;font-family:inherit;transition:border .2s}
.contact-form input:focus,.contact-form textarea:focus{outline:none;border-color:var(--blue-600)}
.form-tip{margin-top:14px;font-size:13px;color:#16a34a;text-align:center;opacity:0;transition:.3s}
.form-tip.show{opacity:1}

/* 页脚 */
.footer{background:#0f172a;color:#94a3b8;padding:56px 0 32px;margin-top:40px}
.footer-inner{display:flex;justify-content:space-between;gap:32px;flex-wrap:wrap}
.footer-logo{color:#fff;font-weight:700;font-size:17px;margin-bottom:8px}
.footer a:hover{color:#fff}
.footer-links{display:flex;gap:24px}
.copyright{width:100%;border-top:1px solid #1e293b;padding-top:24px;font-size:13px}

/* 动画 */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.reveal.visible{opacity:1;transform:none}

/* 响应式 */
@media(max-width:860px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-2{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .hero h1{font-size:32px}
  .menu-btn{display:flex}
  .nav-links{position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;gap:0;border-bottom:1px solid var(--line);max-height:0;overflow:hidden;transition:max-height .3s}
  .nav-links.open{max-height:240px}
  .nav-links a{padding:14px 24px;border-top:1px solid var(--line)}
}
@media(max-width:520px){
  .grid-4{grid-template-columns:1fr}
  .section{padding:56px 0}
  .cta-box{padding:40px 24px}
}