:root {
  --walnut: #3E2723; --walnut-light: #5D4037; --walnut-mid: #8D6E63;
  --cream: #F5F0EB; --cream-dark: #E8DDD3; --white: #FFFFFF;
  --text: #2C2416; --text-light: #6B5E52; --gold: #B8976A;
  --max-width: 1200px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--text);background:var(--white);line-height:1.8;font-size:16px}

/* Nav（与全站一致） */
nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,0.95);backdrop-filter:blur(10px);border-bottom:1px solid var(--cream-dark);padding:0 24px}
.nav-inner{max-width:var(--max-width);margin:0 auto;display:flex;align-items:center;justify-content:space-between;height:64px}
.nav-brand{font-size:20px;font-weight:700;color:var(--walnut);letter-spacing:2px;text-decoration:none}
.nav-links{display:flex;gap:32px;list-style:none}
.nav-links a{text-decoration:none;color:var(--text-light);font-size:14px;transition:color 0.2s}
.nav-links a:hover{color:var(--walnut)}
.nav-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px;background:none;border:none;width:36px;height:36px;justify-content:center}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--walnut);transition:all 0.3s;border-radius:1px}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.nav-mobile{display:none;position:fixed;top:64px;left:0;right:0;bottom:0;background:rgba(255,255,255,0.98);backdrop-filter:blur(10px);z-index:99;padding:24px;flex-direction:column;gap:8px}
.nav-mobile.active{display:flex}
.nav-mobile a{display:block;padding:16px 8px;font-size:17px;color:var(--walnut);text-decoration:none;border-bottom:1px solid var(--cream-dark);letter-spacing:1px}
.nav-mobile a:hover{color:var(--gold)}

/* Breadcrumb */
.breadcrumb{max-width:var(--max-width);margin:84px auto 0;padding:16px 24px 0;font-size:13px;color:var(--text-light)}
.breadcrumb a{color:var(--walnut-mid);text-decoration:none}
.breadcrumb a:hover{color:var(--walnut)}

/* Product Detail 主区 */
.product-detail{max-width:var(--max-width);margin:0 auto;padding:32px 24px 24px;display:grid;grid-template-columns:1fr 1fr;gap:48px}
.pd-gallery{position:sticky;top:90px;align-self:start}
.pd-main-img{width:100%;border:1px solid var(--cream-dark);border-radius:2px;background:var(--cream);display:block}
.pd-thumbs{display:flex;gap:12px;margin-top:12px}
.pd-thumb{width:72px;height:60px;object-fit:cover;border:2px solid transparent;border-radius:2px;cursor:pointer;opacity:0.7;transition:all 0.2s}
.pd-thumb.active{border-color:var(--walnut);opacity:1}

.pd-info h1{font-size:26px;font-weight:500;color:var(--walnut);letter-spacing:1px;margin-bottom:6px}
.pd-code{font-size:13px;color:var(--text-light);margin-bottom:10px}
.pd-tags{display:flex;gap:8px;margin-bottom:16px}
.pd-tag{padding:3px 10px;font-size:11px;border-radius:2px;background:var(--cream);color:var(--walnut-light);letter-spacing:1px}
.pd-price{display:flex;align-items:baseline;gap:10px;margin-bottom:20px}
.pd-price .label{font-size:14px;color:var(--text-light)}
.pd-price .num{font-size:30px;font-weight:700;color:var(--walnut)}
.pd-price .unit{font-size:14px;color:var(--text-light)}
.pd-desc{font-size:15px;color:var(--text-light);line-height:1.9;margin-bottom:20px;border-top:1px solid var(--cream-dark);padding-top:20px}
.pd-params{width:100%;border-collapse:collapse;font-size:14px}
.pd-params td{padding:9px 0;border-bottom:1px solid var(--cream);color:var(--text)}
.pd-params td:first-child{color:var(--text-light);width:96px}
.pd-params td:last-child{color:var(--walnut)}

/* 选配区 */
.selector{max-width:var(--max-width);margin:0 auto;padding:8px 24px 0}
.selector-head{display:flex;align-items:baseline;gap:12px;margin-bottom:8px;padding-bottom:12px;border-bottom:1px solid var(--cream-dark)}
.selector-head h2{font-size:20px;font-weight:500;color:var(--walnut);letter-spacing:1px}
.selector-head span{font-size:13px;color:var(--text-light)}
.option-list{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:20px 0}
.option-card{position:relative;border:1px solid var(--cream-dark);border-radius:2px;padding:20px;transition:all 0.2s;background:var(--white)}
.option-card:hover{border-color:var(--walnut-mid)}
.option-card.selected{border-color:var(--walnut);box-shadow:0 2px 16px rgba(62,39,35,0.08)}
.option-top{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}
.option-name{font-size:16px;font-weight:600;color:var(--walnut);margin-bottom:4px}
.option-type{display:inline-block;padding:2px 8px;font-size:11px;border-radius:2px;background:var(--cream);color:var(--walnut-mid);margin-bottom:8px}
.option-meta{font-size:13px;color:var(--text-light);line-height:1.9}
.option-price{font-size:17px;font-weight:700;color:var(--walnut);white-space:nowrap;margin-left:8px}
.option-qty{display:flex;align-items:center;gap:10px;margin-top:14px}
.option-qty button{width:30px;height:30px;border:1px solid var(--cream-dark);background:var(--white);color:var(--walnut);font-size:16px;cursor:pointer;border-radius:2px;font-family:inherit;line-height:1}
.option-qty button:hover{border-color:var(--walnut);background:var(--walnut);color:var(--white)}
.option-qty .num{min-width:30px;text-align:center;font-size:15px;font-weight:600;color:var(--walnut)}
.option-check{position:absolute;top:14px;right:14px;width:22px;height:22px;border:1px solid var(--cream-dark);border-radius:2px;background:var(--white);display:flex;align-items:center;justify-content:center;font-size:13px;color:var(--white);transition:all 0.15s;cursor:pointer}
.option-check.on{background:var(--walnut);border-color:var(--walnut)}
.option-card.selected .option-check.on{color:var(--cream)}
.empty-options{background:var(--cream);border:1px dashed var(--walnut-mid);border-radius:2px;padding:40px;text-align:center;color:var(--text-light);font-size:15px;margin:20px 0}
.empty-options a{color:var(--walnut);margin-left:6px}

/* 价格汇总条 */
.summary-bar{position:sticky;bottom:0;left:0;right:0;z-index:90;background:rgba(255,255,255,0.96);backdrop-filter:blur(10px);border-top:1px solid var(--cream-dark)}
.summary-inner{max-width:var(--max-width);margin:0 auto;padding:16px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.summary-total{display:flex;align-items:baseline;gap:8px}
.summary-total .label{font-size:14px;color:var(--text-light)}
.summary-total .num{font-size:28px;font-weight:700;color:var(--walnut)}
.summary-total .unit{font-size:13px;color:var(--text-light)}
.summary-btn{padding:13px 40px;background:var(--walnut);color:var(--white);border:none;border-radius:2px;font-size:15px;letter-spacing:2px;cursor:pointer;font-family:inherit;transition:background 0.2s}
.summary-btn:hover{background:var(--walnut-light)}
.summary-btn:disabled{background:#ccc;cursor:not-allowed}

/* 下单表单弹层 */
.modal-mask{position:fixed;inset:0;background:rgba(0,0,0,0.45);z-index:200;display:none;align-items:center;justify-content:center;padding:20px}
.modal-mask.show{display:flex}
.modal{background:var(--white);border-radius:4px;max-width:480px;width:100%;padding:36px 32px;position:relative;max-height:90vh;overflow-y:auto}
.modal h3{font-size:20px;color:var(--walnut);font-weight:500;margin-bottom:6px;letter-spacing:1px}
.modal .sub{font-size:13px;color:var(--text-light);margin-bottom:22px}
.modal-close{position:absolute;top:14px;right:16px;background:none;border:none;font-size:22px;color:var(--text-light);cursor:pointer;font-family:inherit}
.form-row{margin-bottom:16px}
.form-row label{display:block;font-size:13px;color:var(--walnut);margin-bottom:6px;font-weight:600}
.form-row input,.form-row textarea{width:100%;padding:11px 12px;border:1px solid var(--cream-dark);border-radius:2px;font-size:14px;font-family:inherit;color:var(--text);transition:border 0.2s}
.form-row input:focus,.form-row textarea:focus{outline:none;border-color:var(--walnut)}
.form-row textarea{resize:vertical;min-height:64px}
.order-summary{background:var(--cream);border-radius:2px;padding:14px 16px;font-size:13px;color:var(--text);line-height:1.9;margin-bottom:18px}
.order-summary b{color:var(--walnut)}
.submit-btn{width:100%;padding:14px;border:none;border-radius:2px;background:var(--walnut);color:var(--white);font-size:15px;letter-spacing:2px;cursor:pointer;font-family:inherit;transition:background 0.2s}
.submit-btn:hover{background:var(--walnut-light)}
.submit-btn:disabled{background:#ccc;cursor:not-allowed}
.form-tip{font-size:12px;color:var(--text-light);text-align:center;margin-top:12px}
.form-err{color:#c0392b;font-size:13px;margin-top:8px;text-align:center}
.success-box{text-align:center;padding:20px 0}
.success-box .icon{font-size:44px;margin-bottom:12px}
.success-box h4{font-size:20px;color:var(--walnut);margin-bottom:8px;font-weight:600}
.success-box p{font-size:14px;color:var(--text-light);margin-bottom:20px}
.success-box .btn{display:inline-block;padding:11px 32px;background:var(--walnut);color:var(--white);border:none;border-radius:2px;font-size:14px;letter-spacing:1px;cursor:pointer;font-family:inherit;text-decoration:none}

/* 相关推荐 / 其他产品 */
.more-products{max-width:var(--max-width);margin:40px auto 80px;padding:0 24px}
.more-products h2{font-size:20px;color:var(--walnut);font-weight:500;margin-bottom:20px;letter-spacing:1px;padding-bottom:12px;border-bottom:1px solid var(--cream-dark)}
.more-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.more-card{border:1px solid var(--cream-dark);border-radius:2px;overflow:hidden;text-decoration:none;transition:box-shadow 0.3s;display:block}
.more-card:hover{box-shadow:0 4px 24px rgba(0,0,0,0.06)}
.more-card img{width:100%;aspect-ratio:4/3;object-fit:cover;display:block}
.more-card .name{padding:14px 16px 6px;font-size:15px;font-weight:600;color:var(--walnut)}
.more-card .price{padding:0 16px 14px;font-size:14px;color:var(--gold)}

/* Footer */
footer{background:#1A1210;color:rgba(255,255,255,0.4);padding:48px 24px;text-align:center;font-size:13px;margin-top:0}
footer .brand{color:var(--cream);font-size:18px;font-weight:700;letter-spacing:2px;margin-bottom:12px}

/* Responsive */
@media(max-width:1024px){
  .product-detail{grid-template-columns:1fr;gap:32px}
  .pd-gallery{position:static}
  .more-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .nav-links{display:none}.nav-toggle{display:flex}
  nav{padding:0 16px}.nav-inner{height:56px}.nav-brand{font-size:18px}
  .breadcrumb{margin-top:72px;padding:12px 16px 0}
  .product-detail{padding:20px 16px 16px}
  .pd-info h1{font-size:22px}
  .pd-price .num{font-size:26px}
  .option-list{grid-template-columns:1fr}
  .summary-inner{padding:12px 16px}
  .summary-total .num{font-size:24px}
  .summary-btn{padding:12px 24px;font-size:14px}
  .more-grid{grid-template-columns:1fr}
  footer{padding:36px 16px}
}
@media(max-width:480px){
  .summary-inner{flex-direction:column;gap:10px;align-items:stretch}
  .summary-total{justify-content:center}
  .summary-btn{width:100%}
  .modal{padding:28px 20px}
}