:root {
  --blue-50: #EFF6FF;
  --blue-100: #DBEAFE;
  --blue-200: #BFDBFE;
  --blue-400: #60A5FA;
  --blue-500: #3B82F6;
  --blue-600: #2563EB;
  --ink: #1E3A5F;
  --slate: #475569;
  --muted: #94A3B8;
  --bg: #F8FBFF;
  --white: #FFFFFF;
  --border: #E2ECF7;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(37, 99, 235, 0.08);
  --maxw: 1120px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { font-weight: 600; font-size: 17px; color: var(--ink); display: flex; align-items: center; gap: 10px; }
.brand .logo {
  width: 30px; height: 30px; border-radius: 8px;
  background: linear-gradient(135deg, var(--blue-400), var(--blue-600));
  display: inline-block;
}
.nav-links { display: flex; gap: 28px; list-style: none; }
.nav-links a { color: var(--slate); font-size: 15px; transition: color .2s; }
.nav-links a:hover, .nav-links a.active { color: var(--blue-600); }
.nav-toggle { display: none; background: none; border: 0; font-size: 22px; color: var(--ink); cursor: pointer; }

/* hero */
.hero { background: linear-gradient(135deg, var(--blue-50), var(--blue-100)); padding: 96px 0 88px; text-align: center; }
.hero .eyebrow {
  display: inline-block; font-size: 13px; color: var(--blue-600);
  background: #fff; border: 1px solid var(--blue-200);
  padding: 6px 14px; border-radius: 999px; margin-bottom: 22px;
}
.hero h1 { font-size: 40px; line-height: 1.25; color: var(--ink); margin-bottom: 18px; font-weight: 600; }
.hero p.lead { font-size: 18px; color: var(--slate); max-width: 660px; margin: 0 auto 32px; }
.hero-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; }
.btn { display: inline-block; padding: 12px 26px; border-radius: 10px; font-size: 15px; font-weight: 500; transition: .2s; }
.btn-primary { background: var(--blue-500); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { background: var(--blue-600); }
.btn-ghost { background: #fff; color: var(--blue-600); border: 1px solid var(--blue-200); }
.btn-ghost:hover { border-color: var(--blue-400); }

/* page hero (inner pages) */
.page-hero { background: linear-gradient(135deg, var(--blue-50), var(--blue-100)); padding: 64px 0; text-align: center; }
.page-hero h1 { font-size: 32px; color: var(--ink); font-weight: 600; }
.page-hero .sub { color: var(--blue-600); font-size: 14px; margin-top: 6px; letter-spacing: 1px; }

/* sections */
.section { padding: 72px 0; }
.section-alt { background: #fff; }
.section h2 { font-size: 28px; color: var(--ink); margin-bottom: 10px; font-weight: 600; }
.section .sub { color: var(--muted); margin-bottom: 36px; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); }
.card h3 { font-size: 18px; margin-bottom: 8px; color: var(--ink); }
.card p { color: var(--slate); font-size: 14px; }

.news-list { display: flex; flex-direction: column; gap: 14px; }
.news-item { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 22px; box-shadow: var(--shadow); }
.news-item .date { color: var(--muted); font-size: 13px; }
.news-item h3 { font-size: 16px; color: var(--ink); margin-top: 4px; }

/* contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.info-item { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.info-item .label { color: var(--muted); font-size: 13px; margin-bottom: 6px; }
.info-item .val { color: var(--ink); font-size: 16px; }

/* placeholder */
.placeholder {
  border: 1.5px dashed var(--blue-200);
  background: var(--blue-50);
  color: var(--slate);
  border-radius: var(--radius);
  padding: 22px;
  font-size: 14px;
}
.placeholder.sm { padding: 14px; }

/* footer */
.site-footer { background: var(--white); border-top: 1px solid var(--border); padding: 28px 0; color: var(--muted); font-size: 13px; }
.site-footer .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

/* responsive */
@media (max-width: 860px) {
  .nav-links {
    position: absolute; top: 64px; left: 0; right: 0; background: #fff;
    flex-direction: column; gap: 0; padding: 8px 20px;
    border-bottom: 1px solid var(--border); display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links li { padding: 12px 0; border-bottom: 1px solid var(--border); }
  .nav-toggle { display: block; }
  .cards { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 30px; }
}