/* ===== 基础变量（科技蓝主题） ===== */
:root {
  --primary: #1f6feb;
  --primary-dark: #1450b8;
  --accent: #00b8d9;
  --ink: #1d2733;
  --muted: #6b7785;
  --bg: #ffffff;
  --bg-alt: #f4f7fb;
  --border: #e3e9f0;
  --radius: 14px;
  --shadow: 0 8px 30px rgba(31, 111, 235, 0.08);
  --maxw: 1140px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

a { color: var(--primary); text-decoration: none; }

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo {
  width: 38px; height: 38px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; font-weight: 700; font-size: 20px;
  display: flex; align-items: center; justify-content: center;
}
.brand-name { font-weight: 700; font-size: 18px; color: var(--ink); display: flex; flex-direction: column; line-height: 1.1; }
.brand-name small { font-size: 10px; font-weight: 500; color: var(--muted); letter-spacing: 1px; }
.nav { display: flex; gap: 28px; }
.nav a { color: var(--ink); font-size: 15px; font-weight: 500; transition: color .2s; }
.nav a:hover { color: var(--primary); }
.nav-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--ink); }

/* ===== 首屏 ===== */
.hero {
  background: linear-gradient(135deg, #0e3a8c 0%, #1f6feb 55%, #00b8d9 100%);
  color: #fff; padding: 96px 0 110px; text-align: center;
}
.hero-tag { letter-spacing: 3px; font-size: 14px; opacity: .9; margin-bottom: 18px; }
.hero h1 { font-size: 40px; font-weight: 800; margin-bottom: 16px; letter-spacing: 1px; }
.hero-sub { font-size: 18px; opacity: .92; margin-bottom: 34px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 13px 30px; border-radius: 999px;
  font-size: 15px; font-weight: 600; transition: transform .15s, box-shadow .2s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: #fff; color: var(--primary); box-shadow: 0 10px 24px rgba(0,0,0,.18); }
.btn-ghost { background: transparent; color: #fff; border: 1.5px solid rgba(255,255,255,.7); }

/* ===== 区块通用 ===== */
.section { padding: 76px 0; }
.section-alt { background: var(--bg-alt); }
.section-title { text-align: center; font-size: 30px; font-weight: 800; margin-bottom: 14px; position: relative; }
.section-title::after {
  content: ""; display: block; width: 56px; height: 4px; border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  margin: 14px auto 0;
}
.section-desc { text-align: center; color: var(--muted); max-width: 760px; margin: 0 auto 40px; font-size: 16px; }

/* ===== 数据条 ===== */
.facts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin: 8px 0 44px; }
.fact { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 16px; text-align: center; box-shadow: var(--shadow); }
.fact-num { font-size: 30px; font-weight: 800; color: var(--primary); }
.fact-num span { font-size: 16px; }
.fact-label { color: var(--muted); font-size: 14px; margin-top: 6px; }

/* ===== 信息卡 ===== */
.info-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow); max-width: 820px; margin: 0 auto; }
.info-card h3 { font-size: 19px; margin-bottom: 18px; }
.info-list { list-style: none; }
.info-list li { display: flex; padding: 12px 0; border-bottom: 1px dashed var(--border); font-size: 15px; }
.info-list li:last-child { border-bottom: none; }
.info-list li span { width: 150px; color: var(--muted); flex-shrink: 0; }
.info-list li b { font-weight: 600; }

/* ===== 经营项目 ===== */
.biz-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.biz-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow); transition: transform .2s, box-shadow .2s; }
.biz-card:hover { transform: translateY(-4px); box-shadow: 0 14px 40px rgba(31,111,235,.14); }
.biz-icon { font-size: 34px; margin-bottom: 12px; }
.biz-card h3 { font-size: 20px; margin-bottom: 10px; }
.biz-card p { color: var(--muted); margin-bottom: 14px; }
.biz-card ul { list-style: none; }
.biz-card ul li { position: relative; padding-left: 20px; font-size: 14.5px; margin: 8px 0; color: var(--ink); }
.biz-card ul li::before { content: "✓"; position: absolute; left: 0; color: var(--primary); font-weight: 700; }

/* ===== 优势 ===== */
.adv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.adv-item { background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 22px; }
.adv-item h3 { font-size: 18px; margin-bottom: 10px; color: var(--primary); }
.adv-item p { color: var(--muted); font-size: 14.5px; }

/* ===== 联系 ===== */
.contact-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 30px; align-items: start; }
.contact-info { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
.contact-row { display: flex; padding: 12px 0; border-bottom: 1px dashed var(--border); font-size: 15px; }
.contact-row:last-child { border-bottom: none; }
.contact-row span { width: 140px; color: var(--muted); flex-shrink: 0; }
.contact-row b { font-weight: 600; }
.contact-note { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
.contact-note h3 { font-size: 19px; margin-bottom: 12px; }
.contact-note p { color: var(--muted); font-size: 15px; }
.contact-note .muted { font-size: 13px; margin-top: 12px; }

/* ===== 页脚 ===== */
.site-footer { background: #0e1b2e; color: #c7d2e0; padding: 40px 0 30px; }
.footer-top { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; margin-bottom: 18px; }
.footer-brand { display: flex; align-items: center; gap: 10px; font-weight: 600; color: #fff; }
.copyright { font-size: 13px; color: #93a3b8; }
.beian { display: flex; gap: 22px; flex-wrap: wrap; border-top: 1px solid rgba(255,255,255,.1); padding-top: 18px; }
.beian a { color: #9fb3c8; font-size: 13px; }
.beian a:hover { color: #fff; }

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .facts, .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .biz-grid, .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: #fff; flex-direction: column; gap: 0; border-bottom: 1px solid var(--border); padding: 8px 0; }
  .nav.open { display: flex; }
  .nav a { padding: 12px 20px; }
  .nav-toggle { display: block; }
  .hero { padding: 70px 0 80px; }
  .hero h1 { font-size: 28px; }
  .hero-sub { font-size: 16px; }
  .section { padding: 54px 0; }
  .section-title { font-size: 24px; }
  .facts, .adv-grid { grid-template-columns: 1fr; }
  .info-list li { flex-direction: column; gap: 2px; }
  .info-list li span { width: auto; }
  .contact-row { flex-direction: column; gap: 2px; }
  .contact-row span { width: auto; }
}