:root{font-family:Arial,Microsoft YaHei,sans-serif;color:#182336;background:#f6f8fb}body{margin:0}main{max-width:960px;margin:48px auto;padding:0 24px}h1{font-size:28px;margin:0 0 24px}.preview-card{background:#fff;border:1px solid #e2e8f0;border-radius:12px;box-shadow:0 1px 3px #1823360d}.preview-card-header{padding:20px 24px 0}.preview-card-title{font-size:18px;margin:0}.preview-card-content{padding:20px 24px}