:root {
  --bg: #0b1220;
  --panel: #121b2e;
  --text: #ecf2ff;
  --muted: #b7c2de;
  --primary: #4ea6ff;
  --accent: #7cf2c8;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 20% 20%, #17243d 0%, var(--bg) 55%);
}

a {
  color: inherit;
  text-decoration: none;
}

.hero {
  min-height: 86vh;
  padding: 24px 6vw 56px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

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

.logo {
  font-weight: 700;
  letter-spacing: 0.4px;
}

.nav-links {
  display: flex;
  gap: 18px;
  color: var(--muted);
}

.nav-links a:hover {
  color: var(--accent);
}

.hero-content {
  max-width: 840px;
  margin-top: 96px;
}

.badge {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid rgba(124, 242, 200, 0.45);
  border-radius: 999px;
  color: var(--accent);
  font-size: 14px;
}

h1 {
  font-size: clamp(34px, 6vw, 64px);
  margin: 18px 0;
  line-height: 1.15;
}

.subtitle {
  color: var(--muted);
  font-size: clamp(16px, 2.2vw, 22px);
  line-height: 1.8;
  max-width: 760px;
}

.cta {
  display: inline-block;
  margin-top: 24px;
  padding: 12px 22px;
  background: linear-gradient(90deg, var(--primary), #68c0ff);
  color: #041223;
  font-weight: 700;
  border-radius: 10px;
}

.section {
  padding: 64px 6vw;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02));
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 14px;
  padding: 22px;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.card p,
.highlight p,
.contact p {
  color: var(--muted);
  line-height: 1.9;
}

.highlight {
  background: rgba(78, 166, 255, 0.08);
  border-top: 1px solid rgba(78, 166, 255, 0.35);
  border-bottom: 1px solid rgba(78, 166, 255, 0.35);
}

.footer {
  padding: 24px 6vw 36px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--muted);
}

.footer a {
  color: #8fccff;
}

.footer a:hover {
  color: var(--accent);
}

@media (max-width: 680px) {
  .nav-links {
    width: 100%;
    flex-wrap: wrap;
    gap: 10px 16px;
  }
}