:root {
  color-scheme: light;
  --bg: #f7f9fc;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #4b5563;
  --primary: #0f62fe;
  --primary-dark: #0a4fd1;
  --border: #e5e7eb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.hero {
  padding: 88px 0 72px;
  background: linear-gradient(145deg, #ffffff 0%, #eef4ff 100%);
  border-bottom: 1px solid var(--border);
}

.tag {
  display: inline-block;
  margin: 0 0 14px;
  padding: 4px 10px;
  border-radius: 999px;
  background: #e8f0ff;
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
}

h1 {
  margin: 0 0 16px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.2;
}

.subtitle {
  margin: 0 0 26px;
  max-width: 740px;
  color: var(--muted);
  font-size: 18px;
}

.btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  text-decoration: none;
  padding: 11px 18px;
  border-radius: 10px;
  font-weight: 600;
  transition: background 0.2s ease;
}

.btn:hover {
  background: var(--primary-dark);
}

.section {
  padding: 62px 0;
}

.section-alt {
  background: #eef3f9;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

h2 {
  margin: 0 0 14px;
  font-size: clamp(24px, 3vw, 34px);
}

.lead {
  margin: 0;
  color: var(--muted);
  max-width: 840px;
}

.cards {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 18px;
}

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

.card p {
  margin: 0;
  color: var(--muted);
}

.footer {
  padding: 24px 0 34px;
  background: #ffffff;
}

.footer p {
  margin: 6px 0;
  color: #6b7280;
  font-size: 14px;
}

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

.footer a:hover {
  text-decoration: underline;
}

@media (max-width: 900px) {
  .cards {
    grid-template-columns: 1fr;
  }
}