/* ============================================================
   电线电缆模块 (dxdl) 样式表
   主色调: #0B3B5F (深蓝)
   辅助色: #D97706 (铜橙)
   中性色: #F4F7FA (浅灰)
   ============================================================ */

/* CSS 变量 */
:root {
    --primary: #0B3B5F;
    --primary-dark: #072A45;
    --primary-light: #1A5276;
    --accent: #D97706;
    --accent-dark: #B86405;
    --accent-light: #F59E0B;
    --gray-50: #F8FAFC;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-400: #94A3B8;
    --gray-500: #64748B;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1E293B;
    --gray-900: #0F172A;
    --white: #FFFFFF;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,.08);
    --shadow-lg: 0 10px 30px rgba(0,0,0,.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition: all .3s ease;
}

/* ============================================================
   重置 & 基础
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--gray-50);
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; }
ul, ol { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 15px; }
.section { padding: 50px 0; }
.section-gray { background: var(--gray-100); }

/* ============================================================
   顶部公告栏
   ============================================================ */
.top-bar {
    background: var(--primary-dark);
    color: rgba(255,255,255,.8);
    font-size: 12px;
    line-height: 36px;
}
.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.top-bar a { color: rgba(255,255,255,.8); margin-left: 20px; }
.top-bar a:hover { color: var(--accent); }
.top-bar i { margin-right: 4px; }

/* ============================================================
   头部主体
   ============================================================ */
.header-main {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 15px 0;
}
.header-content { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.logo img { height: 80px; }
.header-search { flex: 1; max-width: 480px; }
.search-box {
    display: flex;
    border: 2px solid var(--primary);
    border-radius: 50px;
    overflow: hidden;
    background: var(--white);
}
.search-input {
    flex: 1;
    border: none;
    padding: 10px 18px;
    font-size: 14px;
    outline: none;
    color: var(--gray-800);
}
.search-btn {
    background: var(--primary);
    color: var(--white);
    border: none;
    padding: 10px 22px;
    cursor: pointer;
    font-size: 16px;
    transition: var(--transition);
}
.search-btn:hover { background: var(--primary-light); }
.header-hotline {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--primary);
}
.header-hotline i { font-size: 28px; color: var(--accent); }
.hotline-text span { display: block; font-size: 11px; color: var(--gray-500); }
.hotline-text strong { font-size: 16px; color: var(--primary); }

/* ============================================================
   主导航
   ============================================================ */
.nav-main {
    background: var(--primary);
    box-shadow: 0 2px 8px rgba(0,0,0,.15);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.nav-list { display: flex; margin: 0; }
.nav-list > li { position: relative; }
.nav-list > li > a {
    display: block;
    padding: 14px 22px;
    color: rgba(255,255,255,.9);
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
}
.nav-list > li > a i { margin-right: 6px; }
.nav-list > li:hover > a,
.nav-list > li.active > a {
    background: var(--primary-light);
    color: var(--white);
}
.nav-list > li.active > a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 3px;
    background: var(--accent);
    border-radius: 2px;
}
.sub-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 180px;
    background: var(--white);
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-sm);
    z-index: 100;
    padding: 8px 0;
}
.nav-list > li:hover .sub-nav { display: block; }
.sub-nav li a {
    display: block;
    padding: 10px 20px;
    color: var(--gray-700);
    font-size: 14px;
    transition: var(--transition);
}
.sub-nav li a:hover {
    background: var(--gray-100);
    color: var(--accent);
    padding-left: 24px;
}
.mob-toggle {
    display: none;
    cursor: pointer;
    padding: 8px;
}
.mob-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--white);
    margin: 5px 0;
    border-radius: 2px;
}

/* ============================================================
   页面横幅
   ============================================================ */
.page-banner {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary), var(--primary-light));
    padding: 50px 0;
    text-align: center;
    color: var(--white);
}
.banner-content h1 { font-size: 32px; font-weight: 700; margin-bottom: 8px; }
.banner-content p { font-size: 16px; opacity: .8; }

/* ============================================================
   面包屑
   ============================================================ */
.breadcrumb-bar {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 12px 0;
    font-size: 13px;
}
.breadcrumb-bar a,
.breadcrumb-bar .current { margin: 0 4px; }
.breadcrumb-bar .sep { color: var(--gray-400); margin: 0 4px; font-size: 10px; }
.breadcrumb-bar .current { color: var(--gray-500); }

/* ============================================================
   产品布局（列表页）
   ============================================================ */
.product-layout { display: flex; gap: 30px; align-items: flex-start; }

/* 侧边栏 */
.product-sidebar { width: 260px; flex-shrink: 0; }
.sidebar-widget {
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 20px;
    margin-bottom: 20px;
}
.widget-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 15px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--gray-200);
}
.widget-title i { margin-right: 8px; color: var(--accent); }

.category-list > li { margin-bottom: 4px; }
.category-list > li > a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    color: var(--gray-700);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-weight: 500;
}
.category-list > li > a:hover,
.category-list > li.active > a {
    background: var(--primary);
    color: var(--white);
}
.category-list .count { font-size: 12px; opacity: .7; }
.sub-category { padding-left: 20px; margin-top: 4px; display: none; }
.category-list > li.expanded .sub-category { display: block; }
.sub-category li a {
    display: block;
    padding: 6px 14px;
    font-size: 13px;
    color: var(--gray-500);
    border-radius: var(--radius-sm);
}
.sub-category li a:hover,
.sub-category li.active a { color: var(--accent); background: var(--gray-100); }

.sidebar-contact .contact-phone { text-align: center; margin: 10px 0; }
.sidebar-contact .contact-phone i { font-size: 28px; color: var(--accent); display: block; margin-bottom: 8px; }
.sidebar-contact .contact-phone strong {
    font-size: 20px;
    color: var(--primary);
}
.sidebar-contact .contact-desc { text-align: center; font-size: 12px; color: var(--gray-500); }

/* 产品主区域 */
.product-main { flex: 1; min-width: 0; }

/* 工具栏 */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--white);
    padding: 14px 20px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: 20px;
}
.result-count { font-size: 14px; color: var(--gray-600); }
.result-count strong { color: var(--accent); }
.btn-back {
    font-size: 13px;
    color: var(--primary);
    margin-left: 15px;
}
.btn-back i { margin-right: 4px; }
.search-tip { font-size: 13px; color: var(--gray-500); }
.search-tip strong { color: var(--accent); }

/* 产品网格 */
.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.product-card {
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: var(--transition);
}
.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.card-link { display: block; color: inherit; }
.card-link:hover { color: inherit; }
.card-image {
    position: relative;
    height: 200px;
    background: var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .5s ease;
}
.product-card:hover .card-image img { transform: scale(1.05); }
.card-tag {
    position: absolute;
    top: 10px;
    left: 10px;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    color: var(--white);
}
.tag-hot { background: #EF4444; }
.tag-new { background: var(--accent); }
.card-body { padding: 16px; }
.card-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-800);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 8px;
    min-height: 42px;
}
.card-meta { margin-bottom: 10px; }
.meta-item {
    display: block;
    font-size: 12px;
    color: var(--gray-500);
    margin-bottom: 2px;
}
.meta-item i { width: 16px; color: var(--accent); }
.card-params {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}
.param-badge {
    display: inline-block;
    padding: 2px 8px;
    background: var(--gray-100);
    border-radius: 4px;
    font-size: 11px;
    color: var(--gray-600);
}
.param-badge i { margin-right: 3px; color: var(--primary); }
.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 12px;
    border-top: 1px solid var(--gray-200);
}
.price { font-size: 16px; font-weight: 700; color: var(--accent); }
.btn-detail {
    font-size: 12px;
    color: var(--gray-500);
    transition: var(--transition);
}
.product-card:hover .btn-detail { color: var(--accent); }

/* 分页 */
.pagination-wrapper {
    margin-top: 30px;
    text-align: center;
}
.pagination-wrapper ul.pagination {
    display: inline-flex;
    gap: 4px;
}
.pagination-wrapper ul.pagination li { display: inline; }
.pagination-wrapper ul.pagination li span,
.pagination-wrapper ul.pagination li a {
    display: inline-block;
    padding: 8px 14px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    color: var(--gray-600);
    font-size: 13px;
    background: var(--white);
    transition: var(--transition);
}
.pagination-wrapper ul.pagination li a:hover {
    border-color: var(--primary);
    color: var(--primary);
}
.pagination-wrapper ul.pagination li.active span {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}
.pagination-wrapper ul.pagination li.disabled span {
    color: var(--gray-300);
    cursor: not-allowed;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}
.empty-icon { font-size: 64px; color: var(--gray-300); margin-bottom: 20px; }
.empty-state h3 { font-size: 20px; color: var(--gray-700); margin-bottom: 10px; }
.empty-state p { color: var(--gray-500); margin-bottom: 24px; }
.btn-primary {
    display: inline-block;
    padding: 10px 28px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50px;
    font-size: 14px;
    transition: var(--transition);
}
.btn-primary:hover { background: var(--primary-light); color: var(--white); }

/* ============================================================
   产品详情页
   ============================================================ */
.product-detail-header {
    display: flex;
    gap: 30px;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 30px;
    margin-bottom: 30px;
}

/* 产品图库 */
.detail-gallery { width: 480px; flex-shrink: 0; }
.gallery-main {
    width: 100%;
    height: 380px;
    background: var(--gray-100);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 10px;
}
.gallery-main img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.gallery-thumbs {
    display: flex;
    gap: 8px;
}
.thumb-item {
    width: 70px;
    height: 70px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
}
.thumb-item:hover,
.thumb-item.active { border-color: var(--accent); }

/* 产品信息 */
.detail-info { flex: 1; min-width: 0; }
.detail-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
    line-height: 1.4;
}
.detail-tags { margin-bottom: 12px; }
.detail-tags .tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 500;
    margin-right: 6px;
}
.tag-hot { background: #FEE2E2; color: #DC2626; }
.tag-new { background: #FEF3C7; color: var(--accent-dark); }
.tag-views { background: var(--gray-100); color: var(--gray-500); }
.detail-brief {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 20px;
    padding: 12px 16px;
    background: var(--gray-50);
    border-left: 3px solid var(--accent);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.detail-params-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}
.param-item {
    padding: 8px 12px;
    background: var(--gray-50);
    border-radius: var(--radius-sm);
}
.param-label {
    display: block;
    font-size: 11px;
    color: var(--gray-500);
    margin-bottom: 2px;
    text-transform: uppercase;
    letter-spacing: .5px;
}
.param-value {
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-800);
}
.detail-price {
    background: linear-gradient(135deg, var(--gray-50), var(--white));
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: 18px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.price-label { font-size: 14px; color: var(--gray-500); }
.price-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--accent);
}
.price-inquiry {
    font-size: 18px;
    font-weight: 600;
    color: var(--accent);
}
.btn-inquiry {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    background: var(--accent);
    color: var(--white);
    border-radius: 50px;
    font-size: 15px;
    font-weight: 600;
    transition: var(--transition);
}
.btn-inquiry:hover {
    background: var(--accent-dark);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(217,119,6,.3);
}

/* ============================================================
   Tab 切换
   ============================================================ */
.detail-tabs {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}
.tabs-nav {
    display: flex;
    border-bottom: 2px solid var(--gray-200);
    background: var(--gray-50);
}
.tabs-nav li {
    padding: 14px 24px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-600);
    transition: var(--transition);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
}
.tabs-nav li i { margin-right: 6px; }
.tabs-nav li:hover { color: var(--primary); }
.tabs-nav li.active {
    color: var(--primary);
    border-bottom-color: var(--accent);
}
.tabs-content { padding: 30px; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.rich-content { line-height: 2; color: var(--gray-700); }
.rich-content h3 {
    font-size: 18px;
    color: var(--primary);
    margin: 20px 0 10px;
}
.rich-content h3:first-child { margin-top: 0; }
.rich-content p { margin-bottom: 10px; }
.rich-content ul { margin: 10px 0; padding-left: 20px; }
.rich-content ul li { list-style: disc; margin-bottom: 6px; }

/* 参数表格 */
.param-table {
    width: 100%;
    border-collapse: collapse;
}
.param-table thead th {
    background: var(--primary);
    color: var(--white);
    padding: 12px 16px;
    font-size: 14px;
    text-align: left;
}
.param-table thead th:first-child { border-radius: var(--radius-sm) 0 0 0; }
.param-table thead th:last-child { border-radius: 0 var(--radius-sm) 0 0; }
.param-table tbody tr { transition: var(--transition); }
.param-table tbody tr:nth-child(even) { background: var(--gray-50); }
.param-table tbody tr:hover { background: var(--gray-100); }
.param-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--gray-200);
    font-size: 14px;
}
.param-key { font-weight: 600; color: var(--gray-700); width: 40%; }
.param-val { color: var(--gray-600); }
.empty-param {
    text-align: center;
    padding: 40px;
    color: var(--gray-400);
    font-size: 14px;
}
.empty-param i { font-size: 32px; display: block; margin-bottom: 10px; }

/* ============================================================
   推荐产品区域
   ============================================================ */
.section-header {
    text-align: center;
    margin-bottom: 30px;
}
.section-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 6px;
}
.section-title i { color: var(--accent); margin-right: 8px; }
.section-desc { font-size: 14px; color: var(--gray-500); }
.recommend-grid { grid-template-columns: repeat(4, 1fr); }

/* ============================================================
   页脚
   ============================================================ */
.footer-main {
    background: var(--gray-800);
    color: rgba(255,255,255,.7);
    padding-top: 50px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 30px;
    padding-bottom: 30px;
}
.footer-col h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 16px;
    position: relative;
    padding-bottom: 10px;
}
.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--accent);
}
.footer-about p { line-height: 1.8; margin-bottom: 16px; }
.footer-contact p { margin-bottom: 6px; font-size: 13px; }
.footer-contact i { width: 20px; color: var(--accent); margin-right: 6px; }
.footer-links li { margin-bottom: 8px; }
.footer-links a {
    color: rgba(255,255,255,.6);
    font-size: 13px;
    transition: var(--transition);
}
.footer-links a:hover { color: var(--accent); padding-left: 4px; }
.qr-codes {
    display: flex;
    gap: 15px;
}
.qr-item { text-align: center; }
.qr-item img {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-sm);
    margin-bottom: 6px;
}
.qr-item span { display: block; font-size: 12px; color: rgba(255,255,255,.5); }
.footer-bottom {
    width: 100%;
    border-top: 1px solid #000;
    padding: 20px 0;
    text-align: center;
    font-size: 14px;
    background:var(--gray-900);
    line-height: 16px;
}
.footer-bottom hr {
    width: 100%;
    margin: -20px 0 0;
    margin-bottom: 30px;
    border: none;
    border-top: 1px solid #484848;
}
.footer-bottom a { color: rgba(255,255,255,.5); }
.footer-bottom a:hover { color: var(--accent); }
.copyright-row {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 6px 14px;
    text-align: center;
    line-height: 1.6;
}
.copyright-row .beian-icon {
    height: 16px;
    width: auto;
    display: block;
    margin-right: -10px;
}
.copyright-row .full-name {
    width: 100%;
    /*color: rgba(255,255,255,.35);*/
    font-size: 14px;
    color:#fed58e;
}
.friend-links { margin-top: 6px; }

/* --- 平台优势网格 --- */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

/* ============================================================
   响应式设计
   ============================================================ */

/* 平板 (≤992px) */
@media (max-width: 992px) {
    .product-grid { grid-template-columns: repeat(2, 1fr); }
    .recommend-grid { grid-template-columns: repeat(2, 1fr); }
    .advantages-grid { grid-template-columns: repeat(2, 1fr); }
    .product-layout { flex-direction: column; }
    .product-sidebar { width: 100%; }
    .category-list { display: flex; flex-wrap: wrap; gap: 6px; }
    .category-list > li { flex: 0 0 auto; }
    .category-list > li > a { padding: 6px 14px; }
    .sub-category { display: none !important; }
    .product-detail-header { flex-direction: column; }
    .detail-gallery { width: 100%; }
    .gallery-main { height: 320px; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .nav-list > li > a i { display: none; }
    .header-hotline { display: none; }
    .detail-params-grid { grid-template-columns: 1fr; }
}

/* 手机 (≤768px) */
@media (max-width: 768px) {
    .top-bar .top-bar-right { display: none; }
    .header-search { max-width: 100%; }
    .search-input { font-size: 13px; }
    .mob-toggle { display: block; }
    .nav-list { display: none; flex-direction: column; }
    .nav-list.open { display: flex; }
    .sub-nav {
        position: static;
        box-shadow: none;
        border-radius: 0;
        background: var(--primary-dark);
    }
    .sub-nav li a { color: rgba(255,255,255,.7); }
    .sub-nav li a:hover { background: transparent; color: var(--accent); }
    .nav-list > li > a { padding: 12px 18px; border-bottom: 1px solid rgba(255,255,255,.1); }
    .page-banner { padding: 30px 0; }
    .banner-content h1 { font-size: 22px; }
    .product-grid { grid-template-columns: 1fr; }
    .recommend-grid { grid-template-columns: 1fr; }
    .advantages-grid { grid-template-columns: 1fr; }
    .gallery-main { height: 240px; }
    .thumb-item { width: 50px; height: 50px; }
    .detail-price { flex-direction: column; gap: 12px; }
    .tabs-nav li { padding: 10px 14px; font-size: 13px; }
    .footer-grid { grid-template-columns: 1fr; }
    .qr-codes { justify-content: center; }
}

/* 小手机 (≤480px) */
@media (max-width: 480px) {
    .toolbar { flex-direction: column; gap: 8px; align-items: flex-start; }
    .card-params { display: none; }
}