/* ========================================
   DCD 德诚智造 - 产品详情页 样式表
   ======================================== */

/* ---- 基础重置 & 变量 ---- */
:root {
    --color-primary: #1a1a2e;
    --color-accent: #d4a84b;
    --color-accent-hover: #c19a3e;
    --color-bg: #ffffff;
    --color-bg-light: #f8f9fa;
    --color-bg-dark: #1a1a2e;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-text-muted: #999999;
    --color-border: #e8e8e8;
    --color-footer-bg: #141428;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1240px;
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--color-text);
    line-height: 1.6;
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ---- 顶部导航栏 ---- */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.logo-img {
    height: 38px;
    width: auto;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 2px;
}

.nav-list {
    display: flex;
    gap: 36px;
}

.nav-link {
    font-size: 15px;
    color: var(--color-text);
    position: relative;
    padding: 4px 0;
    font-weight: 500;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition);
}

.nav-link:hover {
    color: var(--color-accent);
}

.nav-link:hover::after,
.nav-item.active .nav-link::after {
    width: 100%;
}

.nav-item.active .nav-link {
    color: var(--color-accent);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-search {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: var(--color-text);
    border-radius: 50%;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-search:hover {
    background: var(--color-bg-light);
    color: var(--color-accent);
}

.btn-language {
    background: none;
    border: 1px solid var(--color-border);
    padding: 6px 14px;
    font-size: 13px;
    cursor: pointer;
    border-radius: var(--radius-sm);
    color: var(--color-text-light);
    transition: var(--transition);
    font-weight: 500;
}

.btn-language:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.btn-mobile-menu {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.btn-mobile-menu span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

/* ---- 面包屑 ---- */
.breadcrumb {
    background: var(--color-bg-light);
    padding: 14px 0;
    font-size: 14px;
    color: var(--color-text-muted);
    border-bottom: 1px solid var(--color-border);
}

.breadcrumb a {
    color: var(--color-text-light);
}

.breadcrumb a:hover {
    color: var(--color-accent);
}

.breadcrumb .separator {
    margin: 0 10px;
    color: #ccc;
}

.breadcrumb .current {
    color: var(--color-text);
    font-weight: 500;
}

/* ---- 产品主区域 ---- */
.product-main {
    padding: 48px 0 60px;
}

.product-layout {
    display: grid;
    grid-template-columns: 90px 1fr 380px;
    gap: 32px;
    align-items: flex-start;
}

/* 缩略图 */
.product-thumbnails {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.thumbnail {
    width: 90px;
    height: 90px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.thumbnail:hover {
    border-color: var(--color-accent);
    transform: translateX(3px);
}

.thumbnail.active {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 2px rgba(212, 168, 75, 0.2);
}

.thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 主图区域 */
.product-gallery {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-bg-light);
    cursor: zoom-in;
    aspect-ratio: 1 / 1;
    max-height: 540px;
}

.main-image {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.main-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform 0.4s ease;
}

.product-gallery:hover .main-image img {
    transform: scale(1.05);
}

.gallery-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.9);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    opacity: 0;
    color: var(--color-text);
}

.product-gallery:hover .gallery-btn {
    opacity: 1;
}

.gallery-btn.prev { left: 12px; }
.gallery-btn.next { right: 12px; }

.gallery-btn:hover {
    background: var(--color-accent);
    color: #fff;
}

.zoom-hint {
    position: absolute;
    bottom: 12px;
    right: 16px;
    font-size: 12px;
    color: var(--color-text-muted);
    background: rgba(255, 255, 255, 0.85);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    pointer-events: none;
}

/* 产品信息 */
.product-info {
    padding-top: 4px;
}

.product-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 12px;
    line-height: 1.3;
}

.product-rating {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.stars {
    display: flex;
    gap: 2px;
}

.star {
    color: #e0e0e0;
    font-size: 16px;
}

.star.filled {
    color: var(--color-accent);
}

.review-count {
    font-size: 13px;
    color: var(--color-text-muted);
}

.product-desc {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--color-border);
}

/* 产品特点 */
.product-features {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 28px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
}

.feature-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    background: rgba(212, 168, 75, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-text h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 2px;
}

.feature-text p {
    font-size: 13px;
    color: var(--color-text-muted);
}

/* 产品操作按钮 */
.product-actions {
    display: flex
;
    gap: 12px;
    align-items: center;
    margin-top: 80px;
}

.btn-primary {
    flex: 1;
    padding: 14px 28px;
    background: var(--color-accent);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(212, 168, 75, 0.35);
}

.btn-secondary {
    padding: 14px 22px;
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: var(--color-primary);
    color: #fff;
}

.btn-favorite {
    width: 48px;
    height: 48px;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    flex-shrink: 0;
}

.btn-favorite:hover {
    border-color: #e74c3c;
    color: #e74c3c;
}

.btn-favorite.active {
    border-color: #e74c3c;
    color: #e74c3c;
    background: #fef0ef;
}

.btn-favorite.active svg {
    fill: #e74c3c;
}

/* ---- 产品参数 ---- */
.product-params {
    padding: 60px 0;
    background: var(--color-bg-light);
}

.section-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--color-primary);
    text-align: center;
    margin-bottom: 40px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 50px;
    height: 3px;
    background: var(--color-accent);
    margin: 14px auto 0;
    border-radius: 2px;
}

.params-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.param-card {
    background: #fff;
    padding: 28px 20px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid transparent;
}

.param-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: rgba(212, 168, 75, 0.3);
}

.param-icon {
    margin-bottom: 14px;
    display: flex;
    justify-content: center;
}

.param-card h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.param-card p {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.6;
}

/* ---- 产品详情 ---- */
.product-detail {
    padding: 60px 0 80px;
}

.detail-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 40px;
    border-bottom: 2px solid var(--color-border);
}

.detail-tab {
    padding: 14px 32px;
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-light);
    background: none;
    border: none;
    cursor: pointer;
    position: relative;
    transition: var(--transition);
    white-space: nowrap;
}

.detail-tab::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-accent);
    transform: scaleX(0);
    transition: transform var(--transition);
}

.detail-tab:hover {
    color: var(--color-accent);
}

.detail-tab.active {
    color: var(--color-accent);
    font-weight: 600;
}

.detail-tab.active::after {
    transform: scaleX(1);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 详情内容 */
.detail-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.detail-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.detail-image img {
    width: 100%;
    height: auto;
}

.detail-text h3 {
    font-size: 22px;
    color: var(--color-primary);
    margin-bottom: 18px;
    font-weight: 700;
}

.detail-text p {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.9;
    margin-bottom: 14px;
}

.detail-text ul {
    margin-top: 16px;
}

.detail-text ul li {
    font-size: 14px;
    color: var(--color-text-light);
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
}

.detail-text ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 14px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-accent);
}

/* 规格表 */
.specs-table-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

.specs-table {
    width: 100%;
    border-collapse: collapse;
}

.specs-table tr {
    border-bottom: 1px solid var(--color-border);
}

.specs-table tr:last-child {
    border-bottom: none;
}

.specs-table td {
    padding: 16px 20px;
    font-size: 14px;
}

.specs-table td:first-child {
    font-weight: 600;
    color: var(--color-primary);
    width: 180px;
    background: rgba(212, 168, 75, 0.04);
}

.specs-table td:last-child {
    color: var(--color-text-light);
}

/* 应用场景 */
.application-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.app-card {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    background: #fff;
}

.app-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.app-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.app-card h4 {
    font-size: 16px;
    font-weight: 600;
    padding: 16px 16px 4px;
    color: var(--color-primary);
}

.app-card p {
    font-size: 13px;
    color: var(--color-text-muted);
    padding: 0 16px 16px;
    line-height: 1.6;
}

/* 下载列表 */
.download-list {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.download-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.download-item:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-sm);
}

.download-item span {
    flex: 1;
    font-size: 14px;
    color: var(--color-text);
    font-weight: 500;
}

.btn-download {
    padding: 8px 22px;
    background: var(--color-accent);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.btn-download:hover {
    background: var(--color-accent-hover);
}

/* ---- 页脚 ---- */
.footer {
    background: var(--color-footer-bg);
    color: #b0b0c0;
    padding: 56px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-col h4 {
    color: #fff;
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 12px;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--color-accent);
}

.footer-col p {
    font-size: 13px;
    line-height: 1.8;
    margin-bottom: 18px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.06);
    color: #b0b0c0;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--color-accent);
    color: #fff;
    transform: translateY(-2px);
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    font-size: 13px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--color-accent);
    padding-left: 6px;
}

.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 14px;
    font-size: 13px;
    line-height: 1.6;
}

.footer-contact svg {
    flex-shrink: 0;
    margin-top: 2px;
}

.footer-bottom {
    text-align: center;
    padding: 22px 0;
    font-size: 13px;
    color: #666;
}

/* ---- 模态框 ---- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.9);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
}

.modal-content img {
    max-width: 80vw;
    max-height: 80vh;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.modal-close {
    position: absolute;
    top: -44px;
    right: 0;
    background: none;
    border: none;
    color: #fff;
    cursor: pointer;
    padding: 6px;
    transition: var(--transition);
}

.modal-close:hover {
    opacity: 0.7;
    transform: rotate(90deg);
}

.modal-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.15);
    border: none;
    color: #fff;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    backdrop-filter: blur(4px);
}

.modal-nav:hover {
    background: rgba(255, 255, 255, 0.3);
}

.modal-nav.prev { left: -60px; }
.modal-nav.next { right: -60px; }

/* ---- 响应式 ---- */
@media (max-width: 1200px) {
    .product-layout {
        grid-template-columns: 80px 1fr 340px;
        gap: 24px;
    }
}

@media (max-width: 1024px) {
    .nav-list {
        gap: 20px;
    }
    
    .product-layout {
        grid-template-columns: 1fr 1fr;
    }
    
    .product-thumbnails {
        grid-row: 2;
        flex-direction: row;
        grid-column: 1 / -1;
        overflow-x: auto;
    }
    
    .thumbnail {
        flex-shrink: 0;
        width: 72px;
        height: 72px;
    }
    
    .params-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .application-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .detail-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .header-inner {
        height: 60px;
    }
    
    .nav {
        display: none;
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: #fff;
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
    }
    
    .nav.active {
        display: block;
    }
    
    .nav-list {
        flex-direction: column;
        gap: 0;
        padding: 8px 0;
    }
    
    .nav-item {
        padding: 0;
    }
    
    .nav-link {
        display: block;
        padding: 14px 24px;
        border-bottom: 1px solid var(--color-bg-light);
    }
    
    .btn-mobile-menu {
        display: flex;
    }
    
    .product-layout {
        grid-template-columns: 1fr;
    }
    
    .product-thumbnails {
        order: 2;
        grid-column: 1;
    }
    
    .product-gallery {
        order: 1;
        max-height: 400px;
    }
    
    .product-info {
        order: 3;
    }
    
    .params-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    
    .application-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .detail-tabs {
        flex-wrap: wrap;
        gap: 4px;
    }
    
    .detail-tab {
        padding: 12px 20px;
        font-size: 14px;
    }
    
    .specs-table td:first-child {
        width: 120px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .product-title {
        font-size: 22px;
    }
    
    .product-actions {
        flex-wrap: wrap;
    }
    
    .btn-primary {
        flex: 1 1 100%;
    }
    
    .params-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .application-grid {
        grid-template-columns: 1fr;
    }
    
    .detail-tabs {
        flex-direction: column;
    }
    
    .detail-tab {
        width: 100%;
        text-align: center;
    }
    
    .modal-nav.prev { left: 8px; }
    .modal-nav.next { right: 8px; }
}