:root {
  --primary: #2f6bff;
  --primary-dark: #1f4fd6;
  --ink: #1c2330;
  --muted: #6b7280;
  --bg: #ffffff;
  --bg-soft: #f5f7fb;
  --border: #e6e9f0;
  --radius: 12px;
  --shadow: 0 6px 24px rgba(20, 40, 90, 0.08);
  --maxw: 1180px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { font-weight: 800; font-size: 20px; color: var(--primary); letter-spacing: .5px; }
.nav-links { display: flex; gap: 22px; margin-left: auto; }
.nav-links a { color: var(--ink); font-weight: 500; padding: 6px 0; position: relative; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px; background: var(--primary); border-radius: 2px;
}
.nav-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; margin-left: auto; }

/* Hero */
.hero { padding: 72px 0 56px; background: linear-gradient(135deg, #eef3ff 0%, #f7f9ff 60%, #ffffff 100%); }
.hero h1 { font-size: 40px; line-height: 1.25; margin: 0 0 16px; }
.hero .sub { font-size: 18px; color: var(--muted); max-width: 720px; }
.hero .cta { margin-top: 28px; display: flex; gap: 14px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 22px; border-radius: 10px; font-weight: 600; cursor: pointer; border: 1px solid transparent; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: #fff; color: var(--primary); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--primary); }

/* Sections */
.section { padding: 60px 0; }
.section.soft { background: var(--bg-soft); }
.section-head { text-align: center; margin-bottom: 36px; }
.section-head .eyebrow { color: var(--primary); font-weight: 700; letter-spacing: 2px; font-size: 13px; }
.section-head h2 { font-size: 30px; margin: 8px 0 6px; }
.section-head p { color: var(--muted); margin: 0; }

/* Grid */
.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: transform .15s ease, box-shadow .15s ease; }
.card:hover { transform: translateY(-4px); }
.card .thumb { aspect-ratio: 16/10; background: var(--bg-soft); display: flex; align-items: center; justify-content: center; color: var(--muted); font-size: 14px; overflow: hidden; }
.card .thumb img { width: 100%; height: 100%; object-fit: cover; }
.card .body { padding: 16px 18px; }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card .tag { display: inline-block; background: #eef3ff; color: var(--primary); font-size: 12px; padding: 2px 10px; border-radius: 20px; margin-bottom: 8px; }
.card p { color: var(--muted); margin: 0; font-size: 14px; }
.card .meta { color: #9aa3b2; font-size: 13px; margin-top: 10px; }

/* About */
.about-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.about-wrap .text { white-space: pre-line; color: #3a4252; }
.advantages { list-style: none; padding: 0; margin: 18px 0 0; display: flex; flex-wrap: wrap; gap: 10px; }
.advantages li { background: #eef3ff; color: var(--primary); padding: 8px 14px; border-radius: 8px; font-weight: 600; font-size: 14px; }
.mission { font-size: 22px; font-weight: 800; color: var(--primary); margin-top: 14px; }

/* News list */
.news-item { display: grid; grid-template-columns: 120px 1fr; gap: 16px; padding: 16px; border: 1px solid var(--border); border-radius: var(--radius); background: #fff; cursor: pointer; transition: box-shadow .15s; }
.news-item:hover { box-shadow: var(--shadow); }
.news-item .date { color: var(--primary); font-weight: 700; }
.news-item h3 { margin: 0 0 6px; font-size: 17px; }
.news-item p { margin: 0; color: var(--muted); font-size: 14px; }

/* Detail */
.detail { max-width: 860px; margin: 0 auto; padding: 40px 20px; }
.detail h1 { font-size: 32px; margin: 0 0 12px; }
.detail .meta { color: var(--muted); margin-bottom: 24px; }
.detail .cover { border-radius: var(--radius); overflow: hidden; margin-bottom: 24px; }
.detail .content { font-size: 16px; color: #2c3340; }
.back { display: inline-block; margin-bottom: 18px; color: var(--primary); font-weight: 600; }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.contact-info p { margin: 8px 0; }
.contact-info .label { color: var(--muted); display: inline-block; width: 64px; }
.contact-form input, .contact-form textarea { width: 100%; padding: 12px 14px; border: 1px solid var(--border); border-radius: 8px; margin-bottom: 12px; font-size: 14px; font-family: inherit; }
.contact-form textarea { min-height: 120px; resize: vertical; }

/* Footer */
.site-footer { background: #0f1830; color: #c7cfe0; padding: 40px 0 18px; margin-top: 40px; }
.site-footer .container { display: flex; flex-wrap: wrap; gap: 30px; justify-content: space-between; }
.site-footer h4 { color: #fff; margin: 0 0 10px; }
.site-footer a { color: #c7cfe0; }
.site-footer a:hover { color: #fff; }
.copyright { text-align: center; color: #7e88a3; font-size: 13px; padding-top: 18px; border-top: 1px solid #1d294a; margin-top: 18px; }

/* Loading */
.loading { text-align: center; color: var(--muted); padding: 80px 0; }

@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .about-wrap, .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0; flex-direction: column; background: #fff; padding: 16px 20px; border-bottom: 1px solid var(--border); gap: 14px; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .hero h1 { font-size: 30px; }
}