/* 基础与主题 */
:root {
  --brand: #005bbb;
  --brand-ink: #0a1f44;
  --text: #1f2937;
  --muted: #6b7280;
  --bg: #ffffff;
  --bg-alt: #f6f8fb;
  --border: #e5e7eb;
  --radius: 12px;
  --shadow: 0 8px 24px rgba(10,31,68,0.08);
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Noto Sans SC', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, 'PingFang SC', 'Microsoft Yahei', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
.container { width: min(1120px, 92%); margin: 0 auto; }

/* 头部导航 */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.8);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 12px 0; }
.logo { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--brand-ink); }
.logo-mark { display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; background: var(--brand); color: #fff; font-weight: 700; }
.logo-text { font-weight: 700; }
.nav-toggle { display: none; }
.nav-menu { display: flex; gap: 18px; list-style: none; padding: 0; margin: 0; }
.nav-menu a { display: inline-block; padding: 8px 10px; color: var(--text); text-decoration: none; border-radius: 8px; }
.nav-menu a:hover { background: var(--bg-alt); }
.nav-menu a.active { color: var(--brand); font-weight: 600; }

/* Hero */
.hero { background: linear-gradient(180deg, #eaf2ff 0%, #fff 60%); }
.hero-inner { padding: 72px 0; text-align: center; }
.hero h1 { margin: 0 0 12px; font-size: clamp(28px, 4vw, 40px); line-height: 1.2; color: var(--brand-ink); }
.hero p { margin: 0 auto; max-width: 780px; color: var(--muted); }
.hero-cta { margin-top: 22px; display: flex; gap: 12px; justify-content: center; }

/* Buttons */
.btn { display: inline-block; padding: 10px 16px; border-radius: 10px; border: 1px solid var(--border); text-decoration: none; color: var(--text); background: #fff; }
.btn:hover { box-shadow: var(--shadow); }
.btn-primary { background: var(--brand); color: #fff; border-color: transparent; }
.btn-primary:hover { filter: brightness(0.95); }

/* Highlights */
.highlights { padding: 36px 0 8px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.card .icon { font-size: 28px; }
.card h3 { margin: 8px 0; }

/* Trust */
.trust { padding: 24px 0 8px; }
.reasons { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 18px; padding: 0; margin: 10px 0 0; list-style: none; }
.reasons li { background: var(--bg-alt); border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; }

/* CTA */
.cta { padding: 36px 0 54px; }
.cta-inner { background: linear-gradient(180deg, #fff, #eef4ff); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; text-align: center; box-shadow: var(--shadow); }

/* 页 */
.page { padding: 28px 0 40px; }
.grid-2 { display: grid; grid-template-columns: 1.2fr 1fr; gap: 24px; }
.panel { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }

.timeline { list-style: none; padding: 0; margin: 10px 0 0; }
.timeline li { display: grid; grid-template-columns: 100px 1fr; gap: 12px; padding: 12px 0; border-bottom: 1px dashed var(--border); }
.timeline .year { font-weight: 700; color: var(--brand); }

.service-list { display: grid; grid-template-columns: 1fr; gap: 16px; }
.service { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }
.service h2 { margin-top: 0; }

.contact-grid { align-items: start; }
.contact-list { list-style: none; padding: 0; margin: 0 0 18px; }
.contact-form { display: grid; gap: 12px; }
.form-row label { display: grid; gap: 6px; }
input, textarea { width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; font: inherit; }
input:focus, textarea:focus { outline: 2px solid #b9d4ff; border-color: #b9d4ff; }
.map { aspect-ratio: 4/3; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.map iframe { width: 100%; height: 100%; }

/* 页脚 */
.site-footer { border-top: 1px solid var(--border); background: #fff; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 18px; padding: 24px 0; }
.footer-brand { font-weight: 700; margin-bottom: 8px; }
.footer-title { font-weight: 600; margin-bottom: 8px; }
.footer-links { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin: 6px 0; }
.footer-links a { color: var(--text); text-decoration: none; }
.footer-links a:hover { text-decoration: underline; }

copyright { display: block; }
.site-footer .copyright { border-top: 1px solid var(--border); text-align: center; padding: 12px; color: var(--muted); font-size: 14px; }

/* 响应式 */
@media (max-width: 960px) {
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .reasons { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; align-items: center; gap: 8px; padding: 8px 10px; border-radius: 8px; border: 1px solid var(--border); background: #fff; }
  .nav-menu { position: absolute; right: 4%; top: 56px; display: none; flex-direction: column; background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 8px; box-shadow: var(--shadow); }
  .nav-menu.open { display: flex; }
  .grid-3 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}