* {
  box-sizing: border-box;
}

:root {
  color-scheme: light;
  --bg: #f6f8fb;
  --card: #ffffff;
  --text: #172033;
  --muted: #5f6b7a;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --border: #e5eaf2;
  --soft: #eef4ff;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
  color: var(--text);
  background: radial-gradient(circle at top left, #e8f1ff 0, transparent 34rem), var(--bg);
}

.container {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(229, 234, 242, 0.85);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(12px);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
}

.brand {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
  text-decoration: none;
  color: var(--text);
  font-weight: 800;
  font-size: 20px;
}

.brand span {
  color: var(--muted);
  font-weight: 500;
  font-size: 12px;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}

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

.hero {
  padding: 72px 0 48px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 28px;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  border: 1px solid #cfe0ff;
  border-radius: 999px;
  padding: 4px 12px;
  color: var(--primary-dark);
  background: var(--soft);
  font-size: 13px;
  font-weight: 600;
}

h1 {
  margin: 18px 0 16px;
  font-size: clamp(36px, 7vw, 66px);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.lead {
  margin: 0;
  color: var(--muted);
  font-size: 18px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 12px;
  border: 1px solid var(--primary);
  color: #fff;
  background: var(--primary);
  text-decoration: none;
  font-weight: 700;
}

.button.secondary {
  color: var(--primary);
  background: #fff;
}

.preview-card,
.card {
  border: 1px solid var(--border);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 18px 48px rgba(23, 32, 51, 0.08);
}

.preview-card {
  padding: 28px;
}

.app-icon {
  display: block;
  width: 86px;
  height: 86px;
  border-radius: 24px;
  background: #fff;
  box-shadow: inset 0 0 0 1px var(--border);
  object-fit: cover;
}

.preview-card h2 {
  margin: 18px 0 8px;
  font-size: 24px;
}

.meta-list {
  padding: 0;
  margin: 18px 0 0;
  list-style: none;
  color: var(--muted);
  font-size: 14px;
}

.meta-list li + li {
  margin-top: 8px;
}

.section {
  padding: 36px 0;
}

.section h2 {
  margin: 0 0 18px;
  font-size: 28px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.card {
  padding: 22px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.card p,
.card li {
  color: var(--muted);
}

.legal-page {
  padding: 44px 0 64px;
}

.legal-card {
  padding: 32px;
}

.legal-card h1 {
  margin-top: 0;
  font-size: clamp(30px, 5vw, 46px);
}

.legal-card h2 {
  margin-top: 30px;
  font-size: 21px;
}

.footer {
  margin-top: 44px;
  padding: 28px 0;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}

.footer a {
  color: var(--primary);
  text-decoration: none;
}

@media (max-width: 760px) {
  .nav-inner,
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .nav-inner {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
  }

  .hero {
    padding-top: 48px;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .legal-card {
    padding: 22px;
  }
}