:root {
  --bg-1: #060d2d;
  --bg-2: #0e1e57;
  --panel: rgba(12, 24, 66, 0.86);
  --border: rgba(111, 170, 255, 0.72);
  --text: #e9f2ff;
  --muted: #b7c8ec;
  --accent: #ffdf57;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 50% 12%, #1a2f78 0%, #0b173f 45%, #070b24 100%);
}

.container {
  width: min(980px, 94vw);
  margin: 22px auto 40px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.lang-switch,
.nav-links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.chip {
  text-decoration: none;
  color: #dce9ff;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 12px;
  background: rgba(12, 24, 63, 0.8);
  font-size: 14px;
}

.chip.active {
  color: var(--accent);
  border-color: rgba(255, 223, 87, 0.85);
}

.card {
  border: 2px solid var(--border);
  border-radius: 16px;
  background: linear-gradient(170deg, rgba(18, 34, 82, 0.88), rgba(8, 16, 45, 0.92));
  padding: 24px;
  box-shadow: 0 16px 42px rgba(0, 0, 0, 0.35);
}

h1 {
  margin: 0 0 8px;
  font-size: clamp(28px, 5vw, 48px);
  color: var(--accent);
}

h2 {
  margin: 20px 0 8px;
  font-size: clamp(20px, 3.4vw, 30px);
}

p,
li {
  color: var(--muted);
  line-height: 1.7;
  font-size: 16px;
}

a {
  color: #8ad9ff;
}

.cta-wrap {
  margin-top: 18px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.cta {
  text-decoration: none;
  color: #062044;
  font-weight: 800;
  border-radius: 12px;
  padding: 10px 16px;
  background: linear-gradient(180deg, #8ad5ff, #53a2ea);
}

.cta.secondary {
  color: #eaf4ff;
  background: rgba(28, 52, 118, 0.9);
  border: 1px solid var(--border);
}

.footer-note {
  margin-top: 14px;
  font-size: 13px;
  color: #9eb2db;
}