:root {
  --bg: #f6f8fc;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --border: #e5e7eb;
  --shadow: 0 8px 24px rgba(15, 23, 42, .08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: linear-gradient(180deg, #eef4ff 0%, var(--bg) 160px);
  color: var(--text);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 18px 60px;
}

.hero {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 28px;
  box-shadow: var(--shadow);
}

.hero h1 {
  margin: 0 0 10px;
  font-size: 34px;
}

.hero p {
  margin: 0 0 18px;
  color: var(--muted);
}

.search-box input {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 14px;
  outline: none;
  font-size: 16px;
  background: #fff;
}

.groups {
  margin-top: 24px;
  display: grid;
  gap: 20px;
}

.group {
  background: rgba(255,255,255,.72);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 18px;
  backdrop-filter: blur(8px);
}

.group h2 {
  margin: 0 0 14px;
  font-size: 18px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}

.card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: #c7d2fe;
}

.card-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--primary);
}

.card-desc {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

@media (max-width: 640px) {
  .hero h1 { font-size: 26px; }
  .hero { padding: 20px; }
}