* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #f5f5f7;
  color: #333;
  line-height: 1.6;
}

.hero {
  background: linear-gradient(135deg, #3355ff 0%, #5577ff 100%);
  color: #fff;
  text-align: center;
  padding: 80px 20px;
}

.hero h1 {
  font-size: 2.5em;
  font-weight: 800;
  margin-bottom: 12px;
}

.tagline {
  font-size: 1.2em;
  opacity: 0.85;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 20px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-bottom: 60px;
}

.card {
  background: #fff;
  border-radius: 16px;
  padding: 32px 24px;
  text-decoration: none;
  color: inherit;
  border: 1px solid #e8e8e8;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.card-icon {
  font-size: 2.5em;
  margin-bottom: 12px;
}

.card h2 {
  font-size: 1.2em;
  margin-bottom: 8px;
}

.card p {
  font-size: 0.92em;
  color: #666;
}

.card-blue { border-top: 4px solid #3355ff; }
.card-green { border-top: 4px solid #22aa44; }
.card-purple { border-top: 4px solid #8844cc; }

.about {
  background: #fff;
  border-radius: 16px;
  padding: 40px 32px;
  border: 1px solid #e8e8e8;
}

.about h2 {
  font-size: 1.4em;
  margin-bottom: 12px;
}

.about p {
  margin-bottom: 12px;
  color: #555;
}

.contact a {
  color: #3355ff;
  text-decoration: none;
}

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

footer {
  text-align: center;
  padding: 32px 20px;
  color: #999;
  font-size: 0.88em;
}