/* ============================================
   高端房车外贸网站 - 黑白灰风格主样式
   ============================================ */

/* 重置与基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #000000;
    --primary-dark: #1a1a1a;
    --secondary-color: #333333;
    --text-dark: #111111;
    --text-gray: #666666;
    --text-light: #999999;
    --bg-light: #f5f5f5;
    --bg-white: #ffffff;
    --border-color: #e5e5e5;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
}

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

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

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 28px;
    font-size: 16px;
    font-weight: 600;
    text-align: center;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background-color: #222222;
    color: white;
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: white;
}

.btn-lg {
    padding: 16px 36px;
    font-size: 18px;
}

/* ============================================
   头部导航
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.logo img {
    height: 160px;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 8px;
}

.main-nav a {
    display: block;
    padding: 10px 16px;
    color: var(--text-dark);
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--primary-color);
    background-color: rgba(0, 0, 0, 0.06);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

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

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

/* ============================================
   Hero 全屏大图
   ============================================ */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: #000000;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.6;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(0,0,0,0.2) 0%, rgba(0,0,0,0.4) 100%);
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    color: white;
    max-width: 800px;
    padding: 0 20px;
}

.hero h1 {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.hero p {
    font-size: 22px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.scroll-down {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    color: white;
    font-size: 14px;
    text-align: center;
    animation: bounce 2s infinite;
    z-index: 10;
}

.scroll-down svg {
    width: 24px;
    height: 24px;
    margin-top: 8px;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* ============================================
   新增首页板块样式
   ============================================ */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-card {
    text-align: center;
    padding: 30px 20px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: var(--primary-color);
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-gray);
    font-size: 14px;
    line-height: 1.7;
}

.series-header {
    text-align: center;
    margin-bottom: 40px;
}

.series-header h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
}

.series-subtitle {
    font-size: 16px;
    color: var(--text-gray);
}

.engineering-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.engineering-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.material-item {
    margin-bottom: 30px;
}

.material-item:last-child {
    margin-bottom: 0;
}

.material-item h4 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 10px;
}

.material-item p {
    color: var(--text-gray);
    line-height: 1.7;
}

.oem-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.oem-item {
    background: white;
    padding: 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.oem-item:hover {
    box-shadow: var(--shadow-md);
}

.oem-item h4 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.oem-item p {
    color: var(--text-gray);
    line-height: 1.7;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-list .faq-item {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.faq-list .faq-item:last-child {
    border-bottom: none;
}

.faq-list .faq-item h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
}

.faq-list .faq-item p {
    color: var(--text-gray);
    line-height: 1.7;
}

.cta-section {
    background: #000000 !important;
    color: white;
}

.cta-section .btn-outline {
    border-color: white;
    color: white;
}

.cta-section .btn-outline:hover {
    background: white;
    color: black;
}

/* ============================================
   通用区块样式
   ============================================ */
.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-gray);
    max-width: 600px;
    margin: 0 auto;
}

.section-divider {
    width: 60px;
    height: 4px;
    background-color: var(--primary-color);
    margin: 20px auto 0;
    border-radius: 2px;
}

/* ============================================
   产品卡片
   ============================================ */
.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.product-card {
    background-color: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.product-image {
    position: relative;
    height: 280px;
    overflow: hidden;
    background-color: var(--bg-light);
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

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

.product-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    background-color: var(--secondary-color);
    color: white;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
}

.product-info {
    padding: 24px;
}

.product-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.product-desc {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 16px;
    line-height: 1.6;
}

.product-price {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 16px;
}

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

.product-footer .btn {
    flex: 1;
    padding: 10px 16px;
    font-size: 14px;
}

/* ============================================
   分类卡片
   ============================================ */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.category-card {
    position: relative;
    height: 300px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.category-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.category-card:hover img {
    transform: scale(1.1);
}

.category-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.7) 100%);
    display: flex;
    align-items: flex-end;
    padding: 30px;
}

.category-info {
    color: white;
}

.category-info h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
}

.category-info p {
    font-size: 14px;
    opacity: 0.9;
}

/* ============================================
   案例展示
   ============================================ */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.case-card {
    background-color: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.case-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.case-image {
    height: 240px;
    overflow: hidden;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.case-card:hover .case-image img {
    transform: scale(1.05);
}

.case-content {
    padding: 24px;
}

.case-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.case-meta {
    display: flex;
    gap: 16px;
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 16px;
}

.case-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.case-excerpt {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ============================================
   FAQ 样式
   ============================================ */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: white;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
}

.faq-question {
    padding: 20px 24px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--primary-color);
}

.faq-question .icon {
    width: 24px;
    height: 24px;
    transition: var(--transition);
    flex-shrink: 0;
}

.faq-item.active .faq-question .icon {
    transform: rotate(180deg);
}

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

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer-content {
    padding: 0 24px 20px;
    color: var(--text-gray);
    line-height: 1.8;
}

/* ============================================
   选配定制系统
   ============================================ */
.configurator {
    padding: 40px 0;
}

.configurator-header {
    text-align: center;
    margin-bottom: 50px;
}

.configurator-header h1 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 16px;
}

.configurator-header p {
    font-size: 18px;
    color: var(--text-gray);
}

.configurator-steps {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 50px;
}

.step {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-light);
    font-weight: 500;
}

.step.active {
    color: var(--primary-color);
}

.step.completed {
    color: var(--text-dark);
}

.step-number {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
}

.step.active .step-number {
    background-color: var(--primary-color);
    color: white;
}

.step.completed .step-number {
    background-color: #000000;
    color: white;
}

.vehicles-selector {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 40px;
}

.vehicle-card {
    background-color: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 30px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

.vehicle-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.vehicle-card.selected {
    border-color: var(--primary-color);
    background-color: rgba(0, 0, 0, 0.03);
    box-shadow: var(--shadow-lg);
}

.vehicle-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
}

.vehicle-card h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 8px;
}

.vehicle-card p {
    color: var(--text-gray);
    font-size: 14px;
}

.packages-selector {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 40px;
}

.package-card {
    background-color: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
}

.package-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.package-card.selected {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-xl);
}

.package-header {
    padding: 24px;
    text-align: center;
    background-color: var(--bg-light);
    border-bottom: 1px solid var(--border-color);
}

.package-card.selected .package-header {
    background-color: var(--primary-color);
    color: white;
}

.package-header h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
}

.package-price {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
}

.package-card.selected .package-price {
    color: white;
}

.package-body {
    padding: 24px;
}

.package-features {
    list-style: none;
}

.package-features li {
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
    color: var(--text-gray);
    display: flex;
    align-items: center;
    gap: 10px;
}

.package-features li:last-child {
    border-bottom: none;
}

.package-features li::before {
    content: '✓';
    color: #000000;
    font-weight: bold;
}

/* 配置详情区 */
.config-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.config-section {
    background-color: white;
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow-md);
}

.config-section h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--border-color);
}

.standard-list, .upgrade-list {
    list-style: none;
}

.standard-item, .upgrade-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid var(--border-color);
}

.standard-item:last-child, .upgrade-item:last-child {
    border-bottom: none;
}

.item-image {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    flex-shrink: 0;
    background-color: var(--bg-light);
}

.item-info {
    flex: 1;
}

.item-name {
    font-weight: 600;
    margin-bottom: 4px;
}

.item-desc {
    font-size: 13px;
    color: var(--text-gray);
}

.item-price {
    font-weight: 600;
    color: var(--primary-color);
    flex-shrink: 0;
}

.upgrade-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

/* 价格汇总 */
.price-summary {
    position: sticky;
    top: 100px;
    background-color: white;
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow-lg);
}

.price-summary h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--border-color);
}

.price-row {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    font-size: 15px;
    color: var(--text-gray);
}

.price-row.total {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
    padding-top: 20px;
    margin-top: 10px;
    border-top: 2px solid var(--border-color);
}

.price-row.total .price {
    color: var(--primary-color);
}

.quote-form {
    margin-top: 30px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-dark);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 15px;
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.08);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.submit-btn {
    width: 100%;
    padding: 16px;
    font-size: 16px;
    font-weight: 600;
}

/* ============================================
   联系页面
   ============================================ */
.contact-section {
    padding: 100px 0;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 20px;
}

.contact-info > p {
    font-size: 16px;
    color: var(--text-gray);
    margin-bottom: 40px;
    line-height: 1.8;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.contact-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: rgba(0, 0, 0, 0.06);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon svg {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
}

.contact-item h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
}

.contact-item p {
    color: var(--text-gray);
    font-size: 15px;
}

.contact-form-card {
    background-color: white;
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.contact-form-card h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 30px;
}

/* ============================================
   WhatsApp 悬浮按钮
   ============================================ */
.whatsapp-float {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 999;
    width: 60px;
    height: 60px;
    background-color: #000000;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
    animation: pulse 2s infinite;
}

.whatsapp-float:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

.whatsapp-float svg {
    width: 30px;
    height: 30px;
    color: white;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 0, 0, 0.3); }
    70% { box-shadow: 0 0 0 15px rgba(0, 0, 0, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 0, 0, 0); }
}

/* ============================================
   页脚
   ============================================ */
.footer {
    background-color: #000000;
    color: #999999;
    padding: 80px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 50px;
}

.footer-col h4 {
    color: white;
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 24px;
}

.footer-col p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-logo {
    font-size: 24px;
    font-weight: 700;
    color: white;
    margin-bottom: 16px;
}

.footer-links {
    list-style: none;
}

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

.footer-links a {
    color: #999999;
    font-size: 14px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
    padding-left: 5px;
}

.footer-contact li {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 14px;
}

.footer-bottom {
    border-top: 1px solid #333333;
    padding-top: 30px;
    text-align: center;
    font-size: 14px;
}

/* ============================================
   页面Banner
   ============================================ */
.page-banner {
    height: 400px;
    background: #000000;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    margin-top: 80px;
    position: relative;
    overflow: hidden;
}

.page-banner img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.4;
}

.page-banner-content {
    position: relative;
    z-index: 1;
}

.page-banner h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
}

.page-banner p {
    font-size: 18px;
    opacity: 0.9;
}

.breadcrumb {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
    font-size: 14px;
    opacity: 0.8;
}

.breadcrumb a {
    color: white;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
    .products-grid,
    .cases-grid,
    .categories-grid,
    .vehicles-selector,
    .packages-selector {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .config-details {
        grid-template-columns: 1fr;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
    }

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

    .engineering-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

@media (max-width: 768px) {
    .main-nav {
        display: none;
        position: absolute;
        top: 80px;
        left: 0;
        right: 0;
        background-color: white;
        box-shadow: var(--shadow-lg);
        padding: 20px;
    }
    
    .main-nav.active {
        display: block;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 0;
    }
    
    .main-nav a {
        padding: 15px;
        border-bottom: 1px solid var(--border-color);
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero h1 {
        font-size: 36px;
    }
    
    .hero p {
        font-size: 18px;
    }
    
    .section-title {
        font-size: 30px;
    }
    
    .products-grid,
    .cases-grid,
    .categories-grid,
    .vehicles-selector,
    .packages-selector {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .page-banner h1 {
        font-size: 32px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .configurator-steps {
        flex-wrap: wrap;
        gap: 20px;
    }

    /* 定制页移动端价格固定底部 */
    .configurator {
        padding-bottom: 180px;
    }
    .price-summary {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        top: auto;
        border-radius: 0;
        z-index: 999;
        box-shadow: 0 -4px 12px rgba(0,0,0,0.1);
        padding: 20px;
    }
    .price-summary h3 {
        display: none;
    }
    .price-row {
        padding: 8px 0;
    }
    .price-row.total {
        padding-top: 12px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero h1 {
        font-size: 28px;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 24px;
    }

    .whatsapp-float {
        width: 50px;
        height: 50px;
        bottom: 20px;
        right: 20px;
    }
}

/* ============================================
   工具类
   ============================================ */
.text-center { text-align: center; }
.text-primary { color: var(--primary-color); }
.text-gray { color: var(--text-gray); }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
.mt-40 { margin-top: 40px; }
.mb-40 { margin-bottom: 40px; }