*{margin:0;padding:0;box-sizing:border-box}:root{--color-primary: #e74c3c;--color-bg: #f5f5f5;--color-card: #fff;--color-text: #333;--color-text-light: #666;--color-border: #e8e8e8;--radius: 12px;--shadow: 0 2px 12px rgba(0, 0, 0, .08)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--color-bg);color:var(--color-text);line-height:1.6}a{text-decoration:none;color:inherit}.app-header{background:var(--color-card);padding:0 24px;height:56px;display:flex;align-items:center;box-shadow:0 1px 4px #0000000f;position:sticky;top:0;z-index:100}.app-header .logo{font-size:18px;font-weight:700;color:var(--color-primary)}.app-main{max-width:960px;margin:0 auto;padding:24px 16px}.hero{text-align:center;padding:48px 0 32px}.hero h1{font-size:32px;margin-bottom:8px}.hero p{color:var(--color-text-light);font-size:16px}.product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}.product-card{background:var(--color-card);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .2s,box-shadow .2s;display:block}.product-card:hover{transform:translateY(-4px);box-shadow:0 6px 20px #0000001f}.card-img{width:100%;height:200px;overflow:hidden;background:#e0e0e0}.card-img img{width:100%;height:100%;object-fit:cover}.card-img.placeholder{display:flex;align-items:center;justify-content:center;color:#999;font-size:14px}.card-body{padding:16px}.card-title{font-size:18px;font-weight:600;margin-bottom:4px}.card-subtitle{color:var(--color-text-light);font-size:13px;margin-bottom:8px}.card-desc{font-size:14px;color:var(--color-text-light);margin-bottom:12px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.card-meta{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:#999}.product-detail{max-width:800px;margin:0 auto}.back-link{display:inline-block;margin-bottom:16px;color:var(--color-primary);font-size:14px}.back-link:hover{text-decoration:underline}.product-content{background:var(--color-card);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow)}.product-content h1{font-size:26px;margin-bottom:8px;line-height:1.4}.product-content h2{font-size:20px;margin:28px 0 12px;padding-bottom:8px;border-bottom:2px solid var(--color-primary)}.product-content p{margin-bottom:12px;color:var(--color-text);font-size:15px}.product-content img{max-width:100%;border-radius:8px;margin:12px 0}.product-content strong{color:var(--color-primary)}.product-content .guide-box{background:#faf5f0;border-left:4px solid var(--color-primary);padding:16px 20px;border-radius:0 8px 8px 0;margin:20px 0}.product-content .guide-box h3{font-size:16px;margin-bottom:8px}.product-content .guide-box .guide-item{margin-bottom:6px;font-size:14px}.product-content .tip{color:var(--color-text-light);font-size:13px;font-style:italic}.product-content hr{border:none;border-top:1px solid var(--color-border);margin:24px 0}.product-content .meta-bar{color:var(--color-text-light);font-size:13px;margin-bottom:20px}.loading,.empty{text-align:center;padding:80px 0;color:var(--color-text-light);font-size:16px}@media(max-width:640px){.hero h1{font-size:24px}.product-grid{grid-template-columns:1fr}.product-content{padding:20px}}