/* 全局重置 & 基础样式（通用） */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto', sans-serif;
}

:root {
    /* 核心配色（严格匹配参考图） */
    --primary-blue: #003366;
    --secondary-blue: #0066CC;
    --white: #FFFFFF;
    --light-gray: #F5F5F5;
    --gray: #777777;
    --black: #333333;
    --dark-blue: #002244;
    --border-gray: #ddd;
    --star-yellow: #FFC107;
    --transition: all 0.3s ease;
}

body {
    color: var(--black);
    line-height: 1.6;
    font-size: 16px;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

/* 按钮样式（通用） */
.btn {
    display: inline-block;
    padding: 12px 24px;
    text-decoration: none;
    border-radius: 0;
    font-weight: 600;
    text-transform: uppercase;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 14px;
}

.quote-btn {
    background-color: var(--secondary-blue);
    color: var(--white);
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
}

.quote-btn:hover {
    background-color: var(--primary-blue);
}

/* 头部样式（通用） */
.header {
    background-color: var(--white);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo img {
    height: 40px;
}

/* 主导航样式（通用） */
.main-nav ul,
.main-nav li,
.dropdown-menu,
.dropdown-menu li {
    list-style: none !important;
    list-style-type: none !important;
}

.main-nav > ul {
    display: flex;
}

.main-nav > ul > li {
    position: relative;
    margin: 0 15px;
}

.main-nav ul li a {
    color: var(--black);
    text-decoration: none;
    font-weight: 500;
    text-transform: capitalize;
    font-size: 14px;
    padding: 10px 0;
    display: block;
    text-indent: 0;
}

.main-nav ul li a.active {
    color: var(--secondary-blue);
    font-weight: 700;
}

.main-nav ul li a:hover {
    color: var(--secondary-blue);
}

.main-nav ul li a i {
    font-size: 10px;
    margin-left: 5px;
}

/* 下拉菜单样式（通用） */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--white);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    width: 200px;
    display: none;
    flex-direction: column;
    padding: 10px 0;
    z-index: 1001;
    padding-left: 0 !important;
    margin-left: 0 !important;
}

.dropdown-menu li {
    padding: 8px 15px;
    margin: 0;
    width: 100%;
}

.dropdown:hover .dropdown-menu {
    display: flex;
}

/* 头部CTA（通用） */
.header-cta {
    display: flex;
    align-items: center;
    gap: 20px;
}

.header-cta .phone {
    color: var(--black);
    text-decoration: none;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 5px;
}

.header-cta .phone i {
    color: var(--secondary-blue);
}

/* 汉堡菜单（通用） */
.hamburger {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--black);
    cursor: pointer;
}

/* -------------------------- Product Detail 专属样式 -------------------------- */
/* 面包屑导航 */
.breadcrumb {
    background-color: var(--light-gray);
    padding: 10px 0;
    border-bottom: 1px solid var(--border-gray);
}

.breadcrumb ul {
    display: flex;
    list-style: none;
    align-items: center;
    font-size: 14px;
}

.breadcrumb ul li {
    margin-right: 8px;
    color: var(--gray);
}

.breadcrumb ul li a {
    color: var(--secondary-blue);
    text-decoration: none;
}

.breadcrumb ul li a:hover {
    text-decoration: underline;
}

.breadcrumb ul li i {
    font-size: 10px;
    color: var(--gray);
    margin: 0 5px;
}

/* 产品头部区域 */
.product-header {
    padding: 30px 0;
    border-bottom: 1px solid var(--border-gray);
}

.product-header-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: flex-start;
}

/* 产品图片画廊 */
.product-gallery .main-img {
    width: 100%;
    height: auto;
    margin-bottom: 15px;
    border: 1px solid var(--border-gray);
}

.thumbnails {
    display: flex;
    align-items: center;
    gap: 10px;
}

.thumb-nav {
    background: var(--white);
    border: 1px solid var(--border-gray);
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.thumb-nav:hover {
    background: var(--light-gray);
}

.thumb-list {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    padding: 5px 0;
    scrollbar-width: thin;
}

.thumb {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border: 2px solid var(--white);
    cursor: pointer;
    transition: var(--transition);
}

.thumb.active {
    border-color: var(--secondary-blue);
}

.thumb:hover {
    opacity: 0.8;
}

/* 产品基本信息 */
.product-info h1 {
    font-size: 32px;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 10px;
    line-height: 1.2;
}

.rating {
    display: flex;
    align-items: center;
    gap: 5px;
    margin-bottom: 15px;
}

.rating i {
    color: var(--star-yellow);
    font-size: 16px;
}

.rating span {
    font-size: 14px;
    color: var(--gray);
    margin-left: 5px;
}

.product-info .desc {
    font-size: 16px;
    color: var(--gray);
    margin-bottom: 20px;
    line-height: 1.8;
}

.product-features {
    list-style: none;
    margin-bottom: 30px;
}

.product-features li {
    margin-bottom: 10px;
    font-size: 14px;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.product-features li i {
    color: var(--secondary-blue);
    margin-top: 3px;
}

.action-buttons {
    display: flex;
    gap: 15px;
}

.contact-btn {
    background-color: var(--white);
    color: var(--secondary-blue);
    border: 1px solid var(--secondary-blue);
}

.contact-btn:hover {
    background-color: var(--secondary-blue);
    color: var(--white);
}

/* 产品核心优势 */
.product-benefits {
    padding: 30px 0;
    background-color: var(--light-gray);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
    text-align: center;
}

.benefit-item {
    padding: 20px 10px;
}

.benefit-item i {
    font-size: 32px;
    color: var(--secondary-blue);
    margin-bottom: 10px;
}

.benefit-item h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 5px;
    color: var(--primary-blue);
}

.benefit-item p {
    font-size: 12px;
    color: var(--gray);
}

/* 产品标签页 */
.product-tabs {
    padding: 40px 0;
}

.tabs-nav {
    display: flex;
    border-bottom: 2px solid var(--border-gray);
    margin-bottom: 20px;
}

.tab-btn {
    background: var(--white);
    border: none;
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    color: var(--black);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: var(--transition);
}

.tab-btn.active {
    color: var(--secondary-blue);
    border-bottom-color: var(--secondary-blue);
}

.tab-btn:hover:not(.active) {
    color: var(--secondary-blue);
    border-bottom-color: var(--light-gray);
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

/* 规格参数标签 */
.specs-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

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

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

.specs-table table td {
    padding: 12px 10px;
    font-size: 14px;
}

.specs-table table td:first-child {
    font-weight: 600;
    width: 30%;
    color: var(--primary-blue);
}

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

.specs-img img {
    width: 100%;
    height: auto;
    border: 1px solid var(--border-gray);
}

/* 产品详情标签 */
.details-content {
    padding: 10px;
}

.details-content h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-blue);
    margin: 20px 0 10px;
}

.details-content p {
    font-size: 14px;
    color: var(--gray);
    line-height: 1.8;
    margin-bottom: 15px;
}

.details-content ol {
    padding-left: 20px;
    font-size: 14px;
    color: var(--gray);
}

.details-content ol li {
    margin-bottom: 8px;
}

/* 应用场景标签 */
.applications-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 15px;
}

.app-item {
    text-align: center;
}

.app-item img {
    width: 100%;
    height: 120px;
    object-fit: cover;
    margin-bottom: 10px;
    border: 1px solid var(--border-gray);
}

.app-item h4 {
    font-size: 14px;
    font-weight: 500;
    color: var(--black);
}

/* 相关产品标签 */
.related-products-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

.related-product {
    border: 1px solid var(--border-gray);
    padding: 15px;
    text-align: center;
}

.related-product img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    margin-bottom: 10px;
    border-bottom: 1px solid var(--border-gray);
    padding-bottom: 5px;
}

.related-product h4 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 15px;
    color: var(--black);
}

.details-btn {
    background-color: var(--white);
    color: var(--secondary-blue);
    border: 1px solid var(--secondary-blue);
    padding: 8px 16px;
    font-size: 12px;
    text-transform: uppercase;
}

.details-btn:hover {
    background-color: var(--secondary-blue);
    color: var(--white);
}

/* FAQ标签 */
.faq-content {
    padding: 10px;
}

.faq-item {
    margin-bottom: 15px;
    border: 1px solid var(--border-gray);
}

.faq-question {
    padding: 15px;
    background-color: var(--light-gray);
    font-size: 16px;
    font-weight: 600;
    color: var(--primary-blue);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-answer {
    padding: 0 15px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer.show {
    padding: 15px;
    max-height: 500px;
}

.faq-answer p {
    font-size: 14px;
    color: var(--gray);
    line-height: 1.8;
}

/* 底部CTA横幅 */
.cta-banner {
    background-color: var(--primary-blue);
    padding: 40px 0;
    color: var(--white);
    margin: 20px 0;
}

.cta-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cta-text h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 10px;
}

.cta-text p {
    font-size: 16px;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: 15px;
}

.whatsapp-btn {
    background-color: #25D366;
    color: var(--white);
    display: flex;
    align-items: center;
    gap: 8px;
}

.whatsapp-btn:hover {
    background-color: #128C7E;
}

/* 页脚样式（通用） */
.footer {
    background-color: var(--primary-blue);
    color: var(--white);
    padding: 60px 0 20px;
}

.footer-container {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 30px;
    margin-bottom: 40px;
}

.footer-col h3, .footer-col h4 {
    text-transform: uppercase;
    margin-bottom: 20px;
    font-size: 18px;
    color: var(--white);
    font-weight: 700;
}

.footer-about p {
    color: #ccc;
    margin-bottom: 20px;
    line-height: 1.8;
}

.social-links a {
    color: var(--white);
    font-size: 18px;
    margin-right: 15px;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--secondary-blue);
}

.footer-col ul {
    list-style: none;
}

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

.footer-col ul li a {
    color: #ccc;
    text-decoration: none;
    transition: var(--transition);
    font-size: 14px;
}

.footer-col ul li a:hover {
    color: var(--white);
    padding-left: 5px;
}

.contact-list li {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
    font-size: 14px;
    color: #ccc;
}

.contact-list li i {
    margin-right: 10px;
    color: var(--secondary-blue);
    width: 16px;
    text-align: center;
}

.footer-bottom {
    border-top: 1px solid #444;
    padding-top: 20px;
    text-align: center;
}

.footer-bottom .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.footer-bottom p {
    color: #ccc;
    font-size: 14px;
}

.footer-links a {
    color: #ccc;
    text-decoration: none;
    font-size: 14px;
    margin-left: 15px;
}

.footer-links a:hover {
    color: var(--white);
}

/* 响应式样式（通用+专属） */
@media (max-width: 992px) {
    /* Product Detail 专属响应式 */
    .product-header-wrapper {
        grid-template-columns: 1fr;
    }

    .benefits-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .specs-grid {
        grid-template-columns: 1fr;
    }

    .applications-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .related-products-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .cta-wrapper {
        flex-direction: column;
        text-align: center;
        gap: 20px;
    }

    /* 通用响应式 */
    .footer-container {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    /* 通用响应式 */
    .hamburger {
        display: block;
    }

    .main-nav {
        position: fixed;
        top: 0;
        right: 0;
        height: 100vh;
        width: 250px;
        background-color: var(--primary-blue);
        transform: translateX(100%);
        transition: var(--transition);
        padding: 30px;
        z-index: 999;
    }

    .main-nav.active {
        transform: translateX(0);
    }

    .main-nav > ul {
        flex-direction: column;
    }

    .main-nav > ul > li {
        margin: 15px 0;
    }

    .main-nav ul li a {
        color: var(--white);
        font-size: 16px;
    }

    .dropdown-menu {
        position: static;
        background-color: #004080;
        width: 100%;
        margin-top: 10px;
    }

    .header-cta {
        display: none;
    }

    /* Product Detail 专属响应式 */
    .product-info h1 {
        font-size: 24px;
    }

    .action-buttons {
        flex-direction: column;
    }

    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .tabs-nav {
        overflow-x: auto;
        flex-wrap: nowrap;
    }

    .tab-btn {
        padding: 10px 15px;
        font-size: 14px;
    }

    .applications-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .related-products-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* 通用响应式 */
    .footer-container {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-bottom .container {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        margin-top: 10px;
    }

    .footer-links a {
        margin: 0 5px;
    }
}

@media (max-width: 576px) {
    /* Product Detail 专属响应式 */
    .product-header, .product-benefits, .product-tabs {
        padding: 20px 0;
    }

    .benefits-grid {
        grid-template-columns: 1fr;
    }

    .applications-grid {
        grid-template-columns: 1fr;
    }

    .related-products-grid {
        grid-template-columns: 1fr;
    }

    .cta-banner {
        padding: 30px 0;
    }

    .cta-buttons {
        flex-direction: column;
        width: 100%;
    }

    .cta-buttons .btn {
        width: 100%;
        text-align: center;
    }

    /* 通用响应式 */
    .footer-container {
        grid-template-columns: 1fr;
    }
}