:root{--primary:#e63946;--accent:#ff9f1c;--bg:#f8f9fa;--card:#fff;--border:#dee2e6;--muted:#6c757d;--radius:12px}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:#212529}
header{background:linear-gradient(135deg,var(--primary) 0%,#ff6b6b 100%);padding:0 20px;position:sticky;top:0;z-index:100;box-shadow:0 2px 8px rgba(230,57,70,.3)}
.header-inner{max-width:1100px;margin:0 auto;display:flex;align-items:center;height:64px;gap:16px}
.logo{color:#fff;font-size:22px;font-weight:700;white-space:nowrap;text-decoration:none}
.logo span{color:var(--accent)}
.search-wrap{flex:1;display:flex;max-width:640px}
.search-wrap input{flex:1;padding:11px 16px;border:none;border-radius:var(--radius) 0 0 var(--radius);font-size:15px;outline:none}
.search-wrap button{padding:11px 24px;background:var(--accent);color:#fff;border:none;border-radius:0 var(--radius) var(--radius) 0;font-size:15px;font-weight:700;cursor:pointer;white-space:nowrap}
.search-wrap button:hover{background:#e08e0b}
main{max-width:1100px;margin:0 auto;padding:28px 16px 60px}
.hot{margin-bottom:28px}
.hot h3{font-size:15px;color:var(--muted);margin-bottom:10px}
.hot-tags{display:flex;flex-wrap:wrap;gap:8px}
.hot-tag{padding:6px 14px;background:var(--card);border:1.5px solid var(--border);border-radius:20px;font-size:13px;cursor:pointer;text-decoration:none;color:#333;transition:all .15s}
.hot-tag:hover{border-color:var(--primary);color:var(--primary)}
.result-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}
.result-header h2{font-size:17px}
.result-header span{font-size:13px;color:var(--muted)}
.savings-bar{background:#fff3cd;border-radius:10px;padding:12px 18px;margin-bottom:20px;font-size:14px;color:#856404}
.savings-bar strong{font-size:17px;color:var(--primary)}
.product-list{display:flex;flex-direction:column;gap:12px}
.product-card{background:var(--card);border-radius:var(--radius);box-shadow:0 2px 10px rgba(0,0,0,.07);padding:16px 20px;display:flex;align-items:center;gap:16px;transition:transform .15s,box-shadow .15s}
.product-card:hover{transform:translateY(-2px);box-shadow:0 4px 16px rgba(0,0,0,.1)}
.product-card.best{border:2px solid var(--primary)}
.card-img{width:80px;height:80px;object-fit:contain;border-radius:8px;background:#f5f5f5;flex-shrink:0}
.card-img-placeholder{width:80px;height:80px;border-radius:8px;background:#f0f0f0;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:24px}
.card-info{flex:1;min-width:0}
.card-platform{display:inline-block;padding:2px 10px;border-radius:5px;font-size:12px;font-weight:700;color:#fff;margin-bottom:6px}
.p-淘宝{background:#ff5500}.p-京东{background:#e31616}.p-拼多多{background:#e02080}
.p-苏宁{background:#0073e6}.p-天猫{background:#cc0000}.p-外国书屋{background:#20a169}
.card-title{font-size:15px;line-height:1.4;margin-bottom:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.card-price-wrap{display:flex;align-items:baseline;gap:8px}
.card-price{font-size:22px;font-weight:700;color:var(--primary)}
.card-price::before{content:'¥';font-size:13px;font-weight:400;vertical-align:super}
.card-origin{font-size:13px;color:var(--muted);text-decoration:line-through}
.best-badge{font-size:11px;background:var(--primary);color:#fff;padding:2px 7px;border-radius:4px}
.card-right{display:flex;flex-direction:column;align-items:flex-end;gap:8px;flex-shrink:0}
.btn-buy{display:inline-block;padding:9px 22px;background:var(--primary);color:#fff;border-radius:8px;text-decoration:none;font-size:14px;font-weight:700;white-space:nowrap}
.btn-buy:hover{background:#c1121f}
.empty{text-align:center;padding:80px 20px;color:var(--muted)}
.empty .icon{font-size:52px;margin-bottom:16px}
.empty h3{font-size:18px;margin-bottom:8px;color:#444}
.api-notice{background:#e8f4fd;border-left:4px solid #0073e6;border-radius:8px;padding:12px 16px;margin-bottom:20px;font-size:13px;color:#0056b3}
footer{background:#222;color:#aaa;text-align:center;padding:24px;font-size:13px}
footer a{color:#ccc;text-decoration:none}
.back-top{display:none;position:fixed;bottom:76px;right:16px;width:42px;height:42px;background:var(--primary);color:#fff;border:none;border-radius:50%;font-size:20px;line-height:1;cursor:pointer;box-shadow:0 2px 10px rgba(0,0,0,.25);z-index:98;align-items:center;justify-content:center;transition:opacity .2s}
.back-top.show{display:flex}
.mobile-nav{display:none;position:fixed;bottom:0;left:0;right:0;background:#fff;border-top:1px solid var(--border);height:56px;align-items:stretch;justify-content:space-around;z-index:100;padding-bottom:env(safe-area-inset-bottom,0px)}
.mobile-nav a{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;color:var(--muted);text-decoration:none;font-size:11px;transition:color .15s}
.mobile-nav a .mn-icon{font-size:20px;line-height:1}
.mobile-nav a.active,.mobile-nav a:hover{color:var(--primary)}

/* 加载动画 */
.loading-wrap{text-align:center;padding:60px 20px}
.spinner{display:inline-block;width:40px;height:40px;border:4px solid #eee;border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite;margin-bottom:16px}
@keyframes spin{to{transform:rotate(360deg)}}
.loading-wrap p{color:var(--muted);font-size:15px}

@media(max-width:640px){
  .mobile-nav{display:flex}
  main{padding:14px 10px calc(56px + 20px + env(safe-area-inset-bottom,0px))}
  footer{padding:16px 16px calc(56px + 16px + env(safe-area-inset-bottom,0px));font-size:11px}
  .header-inner{height:52px;gap:8px}
  .logo{font-size:18px}
  .search-wrap input{padding:9px 12px;font-size:14px}
  .search-wrap button{padding:9px 14px;font-size:14px}
  .hot{margin-bottom:14px}
  .hot h3{font-size:13px}
  .hot-tag{font-size:12px;padding:5px 10px}
  .result-header{margin-bottom:10px}
  .result-header h2{font-size:14px}
  .result-header span{font-size:11px}
  .savings-bar{padding:10px 12px;font-size:13px;margin-bottom:12px}
  .savings-bar strong{font-size:15px}
  .api-notice{font-size:12px;padding:8px 12px;margin-bottom:10px}
  .product-list{gap:8px}
  .product-card{padding:12px;gap:10px}
  .card-img,.card-img-placeholder{width:60px;height:60px}
  .card-img-placeholder{font-size:18px}
  .card-platform{font-size:11px;padding:1px 7px;margin-bottom:3px}
  .card-title{font-size:13px;line-height:1.5;margin-bottom:5px;white-space:normal;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
  .card-price{font-size:18px}
  .card-origin{font-size:12px}
  .card-right{gap:4px}
  .btn-buy{padding:9px 10px;font-size:13px;border-radius:6px;min-width:58px;text-align:center}
  .empty{padding:40px 16px}
  .empty .icon{font-size:40px;margin-bottom:10px}
  .empty h3{font-size:16px}
  .empty p{font-size:13px}
}