/* ==========================================================================
   1. CORE VARIABLES & RESET (高端外贸站轻奢蓝色配色与细节配置)
   ========================================================================== */
:root {
    --primary-color: #1967d2;     /* 核心主题商务蓝，匹配页面字体蓝色 */
    --primary-hover: #1557b0;     /* 悬停加深蓝色 */
    --primary-light: rgba(25, 103, 210, 0.1); /* 淡蓝透明底色 */
    --primary-light-2: rgba(25, 103, 210, 0.05);
    --dark-color: #222222;                  /* 高级深灰（非纯黑，去死板感） */
    --gray-text: #666666;                   /* 常态文本与描述 */
    --light-bg-1: #f4f7fc;                  /* 浅蓝灰：区块隔离，替换原浅绿 */
    --light-bg-2: #f8fafe;                  /* 淡雅浅蓝灰：News区块隔离 */
    --border-color: #e2e8f0;                /* 更淡的现代边框线 */
    --white: #ffffff;
    --radius-main: 8px;                     /* 核心高级微圆角：去除生硬直角的关键 */
    --radius-btn: 4px;                      /* 按钮专用精致小圆角 */
    --transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1); /* 欧美大厂偏爱的缓动阻尼曲线 */
    --max-width: 1200px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--white);
    color: var(--dark-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* 模块间距精细化拉开 */
section {
    padding: 90px 0;
    width: 100%;
}

.container {
    width: 90%;
    max-width: var(--max-width);
    margin: 0 auto;
}

.full-width {
    width: 100% !important;
    max-width: 100% !important;
    padding: 0 !important;
}

/* 带有下划线点缀的中央大标题 */
.section-title-wrapper {
    text-align: center;
    margin-bottom: 55px;
}

.section-title {
    font-size: 2.1rem;
    font-weight: 500;
    color: var(--dark-color);
    text-transform: capitalize;
    display: inline-block;
    position: relative;
    padding-bottom: 15px;
    letter-spacing: 0.5px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

/* ==========================================================================
   2. SCROLL REVEAL ANIMATION (页面下滑渐显动画)
   ========================================================================== */
.reveal-on-scroll {
    opacity: 0;
    transform: translateY(35px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: transform, opacity;
}

.reveal-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================================
   3. PRELOADER (首次进入页面轻量载入转圈)
   ========================================================================== */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--white);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.4s ease, visibility 0.4s ease;
}

.spinner {
    width: 42px;
    height: 42px;
    border: 3px solid var(--primary-light);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 0.75s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

#preloader.fade-out {
    opacity: 0;
    visibility: hidden;
}

/* ==========================================================================
   4. HEADER & NAV (吸顶导航及 Hover 交互)
   ========================================================================== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px); /* 增加背景模糊，更显精致 */
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 75px;
}

.logo {
    text-decoration: none;
    display: flex;
    align-items: center;
}

.logo img {
    height: 42px;
    width: auto;
    display: block;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 35px;
}

.nav-link {
    text-decoration: none;
    color: var(--gray-text);
    font-size: 1.0rem;
    font-weight: 400;
    position: relative;
    padding: 6px 0;
    transition: var(--transition);
}

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

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

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

.nav-link.active {
    color: var(--dark-color);
    font-weight: 700;
}

.nav-link.active::after {
    width: 100%;
    background-color: var(--dark-color);
}

.hamburger {
    display: none;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--dark-color);
}

/* ==========================================================================
   5. 100% FULL-WIDTH SLIDER (100%全宽大图轮播)
   ========================================================================== */
.slider-wrapper {
    width: 100%;
    height: 720px;                               /* 修改：改为 100vh 实现占满整屏 */
    min-height: 720px;
    max-height: 720px;
    margin-top: 0;                               /* 修改：消除 margin-top，让图片置顶从最上方开始 */
    padding-top: 75px;                           /* 增加：用 padding 撑开顶部吸顶导航的高度，防止文字被遮挡 */
    position: relative;
    overflow: hidden;
    background-color: #f0f0f0;
}

.slider-container {
    width: 100%;
    height: 100%;
    position: relative;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.9s cubic-bezier(0.25, 1, 0.5, 1), visibility 0.9s ease;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.slide.active {
    opacity: 1;
    visibility: visible;
}

.slider-dots {
    position: absolute;
    bottom: 25px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
    z-index: 10;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.45);
    cursor: pointer;
    transition: var(--transition);
}

.dot.active, .dot:hover {
    background-color: var(--primary-color);
    transform: scale(1.25);
}

/* ==========================================================================
   6. GLOBAL COMPONENTS (公共精致按钮基类)
   ========================================================================== */
.btn {
    display: inline-block;
    padding: 12px 28px;
    font-size: 0.85rem;
    text-transform: capitalize;
    text-decoration: none;
    border-radius: var(--radius-btn);
    transition: var(--transition);
    cursor: pointer;
    text-align: center;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
    border: 1px solid transparent;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 8px 20px var(--primary-light);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--gray-text);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    color: var(--white);
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 6px 15px var(--primary-light);
    transform: translateY(-2px);
}

.view-more-container {
    text-align: center;
    margin-top: 50px;
}

.btn-view-more {
    padding: 14px 75px;
    background-color: var(--primary-color);
    color: var(--white);
    font-size: 0.9rem;
    font-weight: 500;
}

.btn-view-more:hover {
    background-color: var(--dark-color);
    box-shadow: 0 10px 25px rgba(34,34,34,0.15);
    transform: translateY(-3px);
}

/* ==========================================================================
   7. INTERNAL HERO BANNER (子页面大 Banner)
   ========================================================================== */
.inner-banner {
    background: linear-gradient(rgba(0,0,0,0.35), rgba(0,0,0,0.35)), url('https://images.unsplash.com/photo-1513519245088-0e12902e5a38?auto=format&fit=crop&w=1920&q=80') no-repeat center center/cover;
    height: 240px;
    display: flex;
    align-items: center;
    color: var(--white);
    margin-top: 75px;
}

.inner-banner h1 {
    font-size: 2.2rem;
    font-weight: 500;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.breadcrumb {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.8);
}

.breadcrumb a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
}

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

/* ==========================================================================
   8. FOOTER (统一色调通栏页脚)
   ========================================================================== */
footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 70px 0 25px 0;
    font-size: 0.85rem;
}

footer .logo-footer {
    display: block;
    text-decoration: none;
    margin-bottom: 25px;
}

footer .logo-footer img {
    height: 42px;
    width: auto;
    display: block;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 45px;
}

.footer-col h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 22px;
    text-transform: capitalize;
}

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

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col ul li a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: var(--transition);
}

.footer-col ul li a:hover {
    padding-left: 6px;
    color: var(--dark-color);
}

.subscribe-form {
    display: flex;
    margin-top: 18px;
    max-width: 100%;
}

.subscribe-input {
    flex: 1;
    padding: 11px 14px;
    border: 1px solid var(--white);
    border-right: none;
    outline: none;
    font-size: 0.85rem;
    border-radius: var(--radius-btn) 0 0 var(--radius-btn);
}

.subscribe-btn {
    background-color: var(--dark-color);
    color: var(--white);
    border: 1px solid var(--dark-color);
    padding: 0 18px;
    cursor: pointer;
    transition: var(--transition);
    border-radius: 0 var(--radius-btn) var(--radius-btn) 0;
    font-size: 0.85rem;
}

.subscribe-btn:hover {
    background-color: #000000;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    padding-top: 25px;
    text-align: center;
    color: rgba(255, 255, 255, 0.75);
    font-size: 0.8rem;
}

/* ==========================================================================
   9. CORE RESPONSIVE (响应式折叠适配)
   ========================================================================== */
@media (max-width: 992px) {
    .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 30px; }
}

@media (max-width: 768px) {
    section { padding: 65px 0; }
    .hamburger { display: block; }
    .slider-wrapper { height: 48vh; min-height: 340px; }
    
    .nav-menu {
        position: fixed;
        top: 75px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 75px);
        background-color: rgba(255, 255, 255, 0.98);
        flex-direction: column;
        align-items: center;
        padding-top: 45px;
        gap: 25px;
        transition: var(--transition);
        box-shadow: 0 15px 30px rgba(0,0,0,0.08);
    }

    .nav-menu.active { left: 0; }
    .footer-grid { grid-template-columns: 1fr; gap: 25px; }
}
/* ==========================================================================
   10. PRODUCT DETAIL PAGE STYLES (产品详情页深度定制)
   ========================================================================== */
.product-main-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 50px;
    align-items: start;
}

/* 左侧媒体库结构 - 大图+缩略图网格 */
.product-media-gallery {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* 主图容器 */
.main-image-container {
    background-color: var(--light-bg-1);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-main);
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.02);
}

.main-product-image {
    width: 100%;
    aspect-ratio: 4/3;
    object-fit: cover;
}

.main-image-box {
    width: 100%;
    aspect-ratio: 4/3;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: #a0aec0;
    gap: 15px;
    font-size: 0.95rem;
    background: linear-gradient(135deg, var(--light-bg-2) 0%, #eef2f9 100%);
}

.main-image-box i {
    font-size: 4rem;
    opacity: 0.6;
}

/* 缩略图网格 */
.thumbnail-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.thumbnail-item {
    aspect-ratio: 1;
    background-color: var(--light-bg-1);
    border: 2px solid transparent;
    overflow: hidden;
}

.thumbnail-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-btn);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    color: #a0aec0;
    cursor: pointer;
    transition: var(--transition);
}

.thumbnail-item:hover {
    border-color: var(--primary-color);
    background-color: var(--primary-light-2);
    color: var(--primary-color);
}

.thumbnail-item.active {
    border-color: var(--primary-color);
    background-color: var(--primary-light);
    color: var(--primary-color);
}

/* 右侧产品信息排版 */
.product-info-panel {
    padding: 10px 0;
}

.product-title {
    font-size: 2.2rem;
    font-weight: 600;
    line-height: 1.25;
    color: var(--dark-color);
    margin-bottom: 30px;
    letter-spacing: -0.5px;
}

.product-features-list {
    list-style: none;
    margin-bottom: 40px;
    padding-left: 0;
}

.product-features-list li {
    font-size: 0.95rem;
    color: var(--gray-text);
    padding: 6px 0;
    line-height: 1.6;
}

/* 核心询盘与即时通讯组件区 */
.cta-action-box {
    display: flex;
    flex-direction: column;
    gap: 15px;
    max-width: 420px;
}

.btn-rfq {
    width: 100%;
    padding: 16px;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}

.whatsapp-direct-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background-color: #285eb8; /* WhatsApp 官方绿，保留不改动 */
    color: var(--white);
    text-decoration: none;
    padding: 12px;
    border-radius: var(--radius-btn);
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(37, 211, 102, 0.2);
    transition: var(--transition);
}

.whatsapp-direct-btn:hover {
    background-color: #128C7E;
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(37, 211, 102, 0.35);
}

/* 移动端响应式断点适配 */
@media (max-width: 992px) {
    .product-main-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .product-title {
        font-size: 1.8rem;
        margin-bottom: 20px;
    }
    .cta-action-box {
        max-width: 100%;
    }
}

/* ==========================================================================
   11. PRODUCT DETAIL ADDITIONAL SECTIONS (产品详情附加区域)
   ========================================================================== */

/* 子标题样式 */
.sub-section-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 25px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary-color);
    display: inline-block;
    letter-spacing: 0.5px;
}

/* 独立规格表格区域 - 四列网格样式 */
.spec-section-wrapper {
    margin-top: 60px;
}

.section-badge {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--white);
    font-size: 1rem;
    font-weight: 600;
    padding: 8px 22px;
    border-radius: 6px;
    margin-bottom: 20px;
}

.spec-grid-table {
    width: 100%;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-main);
    overflow: hidden;
}

.spec-grid-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    border-bottom: 1px solid var(--border-color);
}

.spec-grid-row:last-child {
    border-bottom: none;
}

.spec-grid-cell {
    display: flex;
    align-items: center;
    padding: 14px 24px;
    gap: 12px;
}

.spec-grid-cell:first-child {
    border-right: 1px solid var(--border-color);
}

.spec-key {
    font-weight: 700;
    color: var(--dark-color);
    font-size: 0.9rem;
    white-space: nowrap;
    min-width: 120px;
}

.spec-val {
    color: var(--gray-text);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .spec-grid-row {
        grid-template-columns: 1fr;
    }

    .spec-grid-cell:first-child {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
}
.spec-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 25px;
    border: 1px solid #ddd;
}

.spec-table tr {
    border-bottom: 1px solid #ddd;
}

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

.spec-table td {
    padding: 12px 15px;
    font-size: 0.9rem;
}

.spec-table .spec-label {
    font-weight: 600;
    color: var(--dark-color);
    background-color: #f5f5f5;
    width: 35%;
    min-width: 130px;
}

.spec-table td:last-child {
    color: var(--gray-text);
    background-color: var(--white);
}

/* 独立视频区域样式 */
.video-section-wrapper {
    margin-bottom: 50px;
}

.video-section-wrapper .section-badge {
    margin-bottom: 20px;
}

.product-video-container {
    width: 100%;
    border-radius: var(--radius-main);
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.06);
}

.product-video-container video {
    width: 100%;
    display: block;
    border-radius: var(--radius-main);
}

/* 描述内容样式 */
.desc-content-text {
    background-color: var(--white);
    padding: 25px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-main);
    line-height: 1.8;
}

.desc-content-text p {
    margin-bottom: 15px;
    font-size: 0.95rem;
    color: var(--gray-text);
    text-align: justify;
}

.desc-content-text p:last-child {
    margin-bottom: 0;
}

/* 相关产品区域 */
.related-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.related-card {
    background-color: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-main);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.related-card:hover {
    box-shadow: 0 8px 25px rgba(0,0,0,0.08);
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.related-img-placeholder {
    width: 100%;
    aspect-ratio: 4/3;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, var(--light-bg-1) 0%, var(--light-bg-2) 100%);
    font-size: 2.5rem;
    color: var(--primary-color);
    opacity: 0.7;
}

.related-card h3 {
    padding: 18px 20px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--dark-color);
    margin: 0;
}

/* 询盘表单样式 */
.inquiry-form-section {
    background-color: var(--light-bg-1);
    padding: 40px;
    border-radius: var(--radius-main);
    margin-top: 60px;
}

.inquiry-form {
    max-width: 800px;
    margin: 0 auto;
}

.form-group-row {
    display: flex;
    gap: 25px;
    margin-bottom: 20px;
}

.form-input-box {
    flex: 1;
}

.form-input-box label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 8px;
}

.form-input-box input,
.form-input-box textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-btn);
    font-size: 0.9rem;
    color: var(--dark-color);
    background-color: var(--white);
    outline: none;
    transition: var(--transition);
}

.form-input-box input:focus,
.form-input-box textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.form-input-box textarea {
    resize: vertical;
    min-height: 120px;
}

.form-input-box input::placeholder,
.form-input-box textarea::placeholder {
    color: #a0aec0;
}

.form-submit-btn {
    margin-top: 15px;
    padding: 14px 40px;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* 移动端响应式适配 */
@media (max-width: 992px) {
    .related-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .inquiry-form-section {
        padding: 25px;
    }
    
    .form-group-row {
        flex-direction: column;
        gap: 15px;
    }
    
    .video-container {
        aspect-ratio: 4/3;
    }
    
    .play-icon-trigger-large {
        width: 70px;
        height: 70px;
        font-size: 1.6rem;
    }
}

@media (max-width: 768px) {
    .related-grid {
        grid-template-columns: 1fr;
    }
    
    .sub-section-title {
        font-size: 1.3rem;
    }
}