* { margin: 0; padding: 0; box-sizing: border-box; } body { font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); min-height: 100vh; display: flex; justify-content: center; align-items: center; padding: 20px; } .card { background: #fff; border-radius: 16px; padding: 40px 30px; max-width: 520px; width: 100%; box-shadow: 0 20px 50px rgba(0,0,0,0.2); text-align: center; } .card h1 { color: #333; font-size: 1.8rem; margin-bottom: 12px; } .card p { color: #666; line-height: 1.7; font-size: 1rem; } .card .highlight { color: #667eea; font-weight: 600; }