:root {
  --sky: #1677a0;
  --sky-dark: #0d4f6b;
  --ink: #1a2a33;
  --muted: #5b6b73;
  --line: #d7e3e8;
  --bg: #f4f7f8;
  --white: #fff;
  --accent: #c9a227;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.75;
}

a { color: var(--sky); text-decoration: none; }
img, video { max-width: 100%; display: block; }
.wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }

.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 76px;
}
.brand {
  display: flex;
  flex-direction: column;
  color: var(--sky-dark);
  font-weight: 700;
  letter-spacing: 0.04em;
}
.brand small { font-weight: 400; color: var(--muted); font-size: 12px; letter-spacing: 0.08em; }
.nav { display: flex; flex-wrap: wrap; gap: 4px 18px; }
.nav a { color: var(--ink); padding: 8px 0; }
.nav a.active, .nav a:hover { color: var(--sky); }
.header-phone { color: var(--sky-dark); font-weight: 700; white-space: nowrap; }
.menu-btn {
  display: none;
  border: 1px solid var(--line);
  background: var(--white);
  padding: 8px 12px;
  cursor: pointer;
}

.hero {
  background: linear-gradient(160deg, #0d4f6b 0%, #1677a0 55%, #2a9bb8 100%);
  color: var(--white);
  padding: 72px 0 80px;
}
.hero h1 { margin: 0 0 12px; font-size: clamp(28px, 4vw, 42px); letter-spacing: 0.06em; }
.hero p { margin: 0 0 14px; max-width: 720px; font-size: 17px; opacity: 0.95; }
.hero .meta { opacity: 0.85; font-size: 15px; }
.btns { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn {
  display: inline-block;
  padding: 10px 22px;
  border-radius: 2px;
  background: var(--accent);
  color: #1a1608;
  font-weight: 700;
}
.btn.ghost { background: transparent; color: var(--white); border: 1px solid rgba(255,255,255,.55); }

.section { padding: 64px 0; }
.section.alt { background: var(--bg); }
.kicker { color: var(--sky); font-size: 13px; letter-spacing: 0.18em; margin: 0 0 8px; }
h2 { margin: 0 0 16px; font-size: 28px; }
h3 { margin: 0 0 10px; font-size: 20px; color: var(--sky-dark); }
.lead { font-size: 17px; color: var(--muted); max-width: 800px; }

.grid-3, .grid-2 { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: 1fr 1fr; }
.card {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 22px;
}
.card img { height: 180px; width: 100%; object-fit: cover; margin: 0 0 14px; }
.card h3 { margin-top: 0; }

.figure { margin: 0 0 22px; }
.figure img, .figure video {
  width: 100%;
  max-height: 480px;
  object-fit: cover;
  background: #111;
}
.caption { color: var(--muted); font-size: 13px; margin-top: 8px; }

.list { padding-left: 18px; }
.list li { margin: 8px 0; }

.contact-box {
  background: var(--sky-dark);
  color: var(--white);
  padding: 28px;
}
.contact-box a { color: #d8f1ff; font-size: 22px; font-weight: 700; }

.site-footer {
  background: #0a2d3d;
  color: #c9dbe3;
  padding: 36px 0 20px;
  font-size: 14px;
}
.site-footer a { color: #e8f6fb; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 24px; margin-bottom: 24px; }
.copy { border-top: 1px solid rgba(255,255,255,.12); padding-top: 14px; opacity: 0.75; }

@media (max-width: 860px) {
  .menu-btn { display: block; }
  .nav { display: none; width: 100%; flex-direction: column; padding-bottom: 12px; }
  .nav.open { display: flex; }
  .header-inner { flex-wrap: wrap; }
  .grid-3, .grid-2, .foot-grid { grid-template-columns: 1fr; }
  .header-phone { display: none; }
}