:root {
    --primary: #1a56db;
    --primary-dark: #1e3a8a;
    --accent: #38bdf8;
    --bg: #ffffff;
    --bg-soft: #f6f8fb;
    --text: #1f2937;
    --text-light: #6b7280;
    --radius: 14px;
    --shadow: 0 8px 30px rgba(30, 58, 138, .08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: "PingFang SC", "Microsoft YaHei", "WenQuanYi Micro Hei", system-ui, -apple-system, sans-serif;
    color: var(--text); background: var(--bg); line-height: 1.7;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
.container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }

/* ===== 导航栏 ===== */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(255,255,255,.85); backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0,0,0,.05); transition: .3s;
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.logo-mark {
    width: 38px; height: 38px; border-radius: 10px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff; display: flex; align-items: center; justify-content: center; font-size: 15px;
}
.logo-text { font-size: 17px; letter-spacing: .5px; }
.nav-links { display: flex; gap: 30px; }
.nav-links a { font-size: 15px; color: var(--text-light); position: relative; transition: .2s; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a.active::after {
    content: ""; position: absolute; left: 0; right: 0; bottom: -6px; height: 2px;
    background: var(--primary); border-radius: 2px;
}
.menu-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; }
.menu-toggle span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; }

/* ===== Hero ===== */
.hero {
    padding: 140px 0 80px; overflow: hidden; position: relative;
    background: radial-gradient(1200px 500px at 80% -10%, rgba(56,189,248,.18), transparent),
                radial-gradient(900px 400px at 0% 30%, rgba(26,86,219,.10), transparent);
}
.hero-inner { display: grid; grid-template-columns: 1.1fr .9fr; gap: 50px; align-items: center; }
.hero-tag { font-size: 13px; letter-spacing: 3px; color: var(--primary); font-weight: 600; }
.hero h1 { font-size: 52px; line-height: 1.2; margin: 14px 0; font-weight: 800; }
.hero h1 span { background: linear-gradient(90deg, var(--primary), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-desc { color: var(--text-light); font-size: 16px; max-width: 480px; margin-bottom: 28px; }
.hero-actions { display: flex; gap: 14px; }
.btn {
    display: inline-block; padding: 12px 26px; border-radius: 10px; font-size: 15px;
    font-weight: 600; cursor: pointer; border: 0; transition: .25s;
}
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: #fff; box-shadow: 0 6px 18px rgba(26,86,219,.3); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(26,86,219,.35); }
.btn-ghost { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-ghost:hover { background: var(--primary); color: #fff; }
.hero-visual {
    position: relative; border-radius: 22px; overflow: hidden;
    box-shadow: var(--shadow); transform: rotate(-1.5deg);
}
.hero-visual img { width: 100%; height: 360px; object-fit: cover; }
.hero-scroll {
    position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
    width: 26px; height: 42px; border: 2px solid var(--text-light); border-radius: 14px;
    display: flex; justify-content: center; cursor: pointer;
}
.hero-scroll span {
    width: 4px; height: 8px; background: var(--text-light); border-radius: 2px;
    margin-top: 8px; animation: scrollDot 1.4s infinite;
}
@keyframes scrollDot { 0%{opacity:1;transform:translateY(0)} 100%{opacity:0;transform:translateY(14px)} }

/* ===== 通用区块 ===== */
.section { padding: 90px 0; }
.section-head { text-align: center; margin-bottom: 50px; }
.section-head.left { text-align: left; }
.section-sub { font-size: 13px; letter-spacing: 3px; color: var(--primary); font-weight: 600; }
.section-head h2 { font-size: 34px; margin-top: 6px; font-weight: 800; }
.section-head.light h2 { color: #fff; }

/* ===== 关于我们 ===== */
.about { background: var(--bg-soft); }
.about-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.about-card {
    background: #fff; border-radius: var(--radius); padding: 30px 26px;
    box-shadow: var(--shadow); transition: .3s; text-align: center;
}
.about-card:hover { transform: translateY(-6px); }
.about-card img { width: 100%; height: 160px; object-fit: cover; border-radius: 10px; margin-bottom: 18px; }
.about-card h3 { font-size: 19px; margin-bottom: 10px; }
.about-card p { color: var(--text-light); font-size: 14px; }

/* ===== 业务领域 ===== */
.business { background: linear-gradient(135deg, var(--primary-dark), var(--primary)); color: #fff; }
.biz-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.biz-item {
    background: rgba(255,255,255,.10); border: 1px solid rgba(255,255,255,.18);
    border-radius: var(--radius); padding: 28px 20px; text-align: center; transition: .3s; backdrop-filter: blur(4px);
}
.biz-item:hover { background: rgba(255,255,255,.18); transform: translateY(-4px); }
.biz-icon { font-size: 38px; margin-bottom: 12px; }
.biz-item h3 { font-size: 17px; margin-bottom: 8px; }
.biz-item p { font-size: 13px; color: rgba(255,255,255,.82); }

/* ===== 数据统计 ===== */
.stats { background: var(--bg); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-item { padding: 20px; }
.stat-num { font-size: 46px; font-weight: 800; background: linear-gradient(90deg, var(--primary), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat-item p { color: var(--text-light); margin-top: 4px; font-size: 14px; }

/* ===== 联系我们 ===== */
.contact { background: var(--bg-soft); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: start; }
.contact-list { list-style: none; margin-top: 20px; }
.contact-list li { display: flex; gap: 14px; margin-bottom: 20px; align-items: flex-start; }
.contact-list span { font-size: 22px; }
.contact-list b { font-size: 15px; }
.contact-list p { color: var(--text-light); font-size: 14px; }
.contact-form {
    background: #fff; border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow);
    display: flex; flex-direction: column; gap: 14px;
}
.contact-form h3 { font-size: 20px; margin-bottom: 4px; }
.contact-form input, .contact-form textarea {
    width: 100%; padding: 12px 14px; border: 1px solid #e5e7eb; border-radius: 10px;
    font-size: 14px; font-family: inherit; transition: .2s; resize: vertical;
}
.contact-form input:focus, .contact-form textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26,86,219,.12); }
.form-tip { font-size: 13px; color: var(--primary); min-height: 18px; }

/* ===== 页脚 ===== */
.footer { background: #0f172a; color: #cbd5e1; padding: 60px 0 0; }
.footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; padding-bottom: 40px; }
.logo-light .logo-mark { background: linear-gradient(135deg, var(--accent), var(--primary)); }
.logo-light .logo-text { color: #fff; }
.footer-col p { font-size: 14px; margin-top: 14px; }
.footer-col h4 { font-size: 16px; color: #fff; margin-bottom: 14px; }
.footer-col a { display: block; font-size: 14px; color: #94a3b8; margin-bottom: 8px; transition: .2s; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.08); padding: 20px 0; text-align: center;
    font-size: 13px; color: #64748b;
}
.footer-bottom p { margin: 4px 0; }

/* ===== 响应式 ===== */
@media (max-width: 900px) {
    .hero h1 { font-size: 40px; }
    .hero-inner, .contact-grid { grid-template-columns: 1fr; }
    .hero-visual { order: -1; }
    .about-grid { grid-template-columns: 1fr; }
    .biz-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-inner { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
    .menu-toggle { display: flex; }
    .nav-links { position: fixed; top: 68px; left: 0; right: 0; flex-direction: column; gap: 0;
        background: #fff; padding: 10px 24px; box-shadow: 0 12px 24px rgba(0,0,0,.08);
        transform: translateY(-150%); transition: .3s; }
    .nav-links.open { transform: translateY(0); }
    .nav-links a { padding: 12px 0; border-bottom: 1px solid #f1f5f9; }
    .hero h1 { font-size: 32px; }
    .section { padding: 64px 0; }
    .biz-grid, .stats-grid { grid-template-columns: 1fr; }
}