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

:root {
    --primary-color: #165DFF;
    --primary-dark: #0D47A1;
    --text-dark: #333333;
    --text-light: #666666;
    --bg-light: #F5F5F5;
    --bg-dark: #2A2A2A;
    --white: #FFFFFF;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.15);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background-color: var(--white);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--white);
    box-shadow: var(--shadow);
}

.header-top {
    background: var(--bg-light);
    padding: 8px 0;
    font-size: 14px;
    color: var(--text-light);
}

.header-top-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.contact-info {
    display: flex;
    gap: 30px;
}

.contact-info span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.social-icons {
    display: flex;
    gap: 15px;
}

.social-icon {
    color: var(--text-light);
    transition: color 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.social-icon:hover {
    color: var(--primary-color);
}

.navbar {
    padding: 15px 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.navbar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

/* 导航栏右侧内容（移动端菜单按钮和图标） */
.navbar-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

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

.logo-img {
    height: 60px;
    width: auto;
    object-fit: contain;
}

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

.nav-item {
    position: relative;
}

.nav-item a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 15px;
    padding: 10px 0;
    display: block;
    transition: color 0.3s ease;
}

.nav-item a:hover,
.nav-item.active a {
    color: var(--primary-color);
}

.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--white);
    min-width: 150px;
    box-shadow: var(--shadow);
    border-radius: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    list-style: none;
    padding: 10px 0;
}

.nav-item.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li a {
    padding: 10px 20px;
    font-size: 14px;
}

.dropdown-menu li a:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

.btn-primary {
    display: inline-block;
    background: var(--primary-color);
    color: var(--white);
    padding: 12px 28px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(22, 93, 255, 0.4);
}

/* 导航栏图标 */
.navbar-icons {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-dark);
    font-size: 24px;
    cursor: pointer;
    padding: 10px;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.mobile-menu-btn:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

/* 移动端导航菜单 */
.mobile-nav {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    z-index: 999;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease-out;
}

.mobile-nav.active {
    max-height: 800px;
}

.mobile-nav-menu {
    list-style: none;
    padding: 15px;
}

.mobile-nav-item {
    margin-bottom: 8px;
}

.mobile-nav-item a {
    display: block;
    padding: 10px 0;
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 15px;
    transition: color 0.3s ease;
}

.mobile-nav-item a:hover,
.mobile-nav-item.active a {
    color: var(--primary-color);
}

/* 移动端下拉菜单 */
.mobile-dropdown-menu {
    list-style: none;
    padding-left: 20px;
    margin-top: 5px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.mobile-dropdown-menu.active {
    max-height: 500px;
}

.mobile-dropdown-menu li {
    margin-bottom: 5px;
}

.mobile-dropdown-menu li a {
    font-size: 14px;
    padding: 8px 0;
}

.mobile-dropdown-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 15px;
    cursor: pointer;
    padding: 10px 0 10px 5px;
    transition: color 0.3s ease;
}

.mobile-dropdown-toggle:hover {
    color: var(--primary-color);
}

.mobile-dropdown-toggle::after {
    content: '▼';
    font-size: 10px;
    margin-right: 25px;
    transition: transform 0.3s ease;
}

.mobile-dropdown-toggle.active::after {
    transform: rotate(180deg);
}

/* 移动端通知和用户菜单样式 */
.mobile-notification-item,
.mobile-user-item {
    border-top: 1px solid #eee;
    padding-top: 10px;
    margin-top: 8px;
}

.mobile-notification-item .mobile-dropdown-toggle,
.mobile-user-item .mobile-dropdown-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    text-align: left;
}

.mobile-notification-badge {
    background: #ff4d4f;
    color: white;
    font-size: 11px;
    padding: 2px 6px;
    border-radius: 10px;
    margin-left: 8px;
    min-width: 16px;
    text-align: center;
}

.mobile-notification-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.mobile-notification-link .menu-badge {
    background: #165DFF;
    color: white;
    font-size: 11px;
    padding: 2px 6px;
    border-radius: 10px;
}

.icon-item {
    position: relative;
}

.icon-btn {
    background: none;
    border: none;
    color: var(--text-dark);
    font-size: 20px; /* 增大图标大小 */
    cursor: pointer;
    padding: 12px; /* 增大按钮大小 */
    border-radius: 50%;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.icon-btn:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

/* 通知徽章 */
.notification-badge {
    position: absolute;
    top: -2px;
    right: -2px;
    background: #FF4D4F;
    color: var(--white);
    font-size: 10px; /* 缩小字体大小 */
    font-weight: 600;
    width: 16px; /* 缩小徽章大小 */
    height: 16px; /* 缩小徽章大小 */
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: translate(30%, -30%);
    /* 移除动画效果 */
}

/* 图标下拉菜单 */
.icon-item .dropdown-menu {
    right: 0;
    left: auto;
    min-width: 120px; /* 调整宽度以匹配参考截图 */
    background: var(--white);
    border-radius: 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    padding: 0;
    z-index: 1000;
    border: 1px solid #E0E0E0;
}

.icon-item .dropdown-menu li {
    list-style: none;
}

.icon-item .dropdown-menu li a {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    color: var(--text-dark);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    border-radius: 0;
}

.menu-text {
    margin-right: 8px;
}

.menu-badge {
    background: #FF4D4F;
    color: var(--white);
    font-size: 10px;
    font-weight: 600;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-item .dropdown-menu li a:hover {
    background: var(--primary-color);
    color: var(--white);
}

.icon-item .dropdown-menu li a:hover .menu-badge {
    background: var(--white);
    color: var(--primary-color);
}

.icon-item .dropdown-menu li a.active {
    background: var(--primary-color);
    color: var(--white);
}

.icon-item .dropdown-menu li a.active .menu-badge {
    background: var(--white);
    color: var(--primary-color);
}

.icon-item.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* 响应式适配 */
@media (max-width: 768px) {
    .navbar-icons {
        gap: 10px;
    }
    
    .icon-btn {
        font-size: 18px;
        padding: 8px;
    }
    
    .icon-item .dropdown-menu {
        min-width: 140px;
        right: -10px;
    }
    
    .icon-item .dropdown-menu li a {
        padding: 10px 16px;
        font-size: 13px;
    }
}

.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 70px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    animation: slide 30s infinite;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    flex-shrink: 0;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
}

@keyframes slide {
    0% { transform: translateX(0); }
    16.66% { transform: translateX(0); }
    20% { transform: translateX(-100%); }
    36.66% { transform: translateX(-100%); }
    40% { transform: translateX(-200%); }
    56.66% { transform: translateX(-200%); }
    60% { transform: translateX(-300%); }
    76.66% { transform: translateX(-300%); }
    80% { transform: translateX(-400%); }
    96.66% { transform: translateX(-400%); }
    100% { transform: translateX(-500%); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: var(--white);
    padding-top: 0;
    transform: translateY(-180px);
}

.title-box {
    background: rgba(255, 255, 255, 0.05);
    padding: 15px 20px;
    border-radius: 8px;
    display: inline-block;
    text-align: center;
    backdrop-filter: blur(5px);
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: 20px;
    font-weight: 400;
    margin-bottom: 0;
    opacity: 0.95;
}

.search-box {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow-hover);
    max-width: 900px;
    margin: 0 auto;
    transform: translateY(170px);
}

.search-row {
    display: flex;
    gap: 20px;
    align-items: flex-end;
}

.search-field {
    flex: 1;
    text-align: left;
}

.search-field label {
    display: block;
    font-size: 14px;
    color: #FFFFFF;
    margin-bottom: 8px;
    font-weight: 500;
}

.search-field select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #E0E0E0;
    border-radius: 6px;
    font-size: 15px;
    color: var(--text-dark);
    background: var(--white);
    cursor: pointer;
    transition: border-color 0.3s ease;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 15px center;
}

.search-field select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn-search {
    background: var(--primary-color);
    color: var(--white);
    padding: 12px 40px;
    border: none;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-search:hover {
    background: var(--primary-dark);
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 50px;
    color: var(--text-dark);
}

.section-title.light {
    color: var(--white);
}

.hot-cars {
    padding: 80px 0;
    background: var(--white);
}

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

.car-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

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

.car-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.car-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.car-tag {
    position: absolute;
    top: 15px;
    left: 15px;
    padding: 5px 12px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
    color: var(--white);
}

.car-tag.hot {
    background: #FF4D4F;
}

.car-tag.new {
    background: #52C41A;
}

.car-tag.quality {
    background: var(--primary-color);
}

.car-info {
    padding: 20px;
}

.car-name {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-dark);
    text-align: center;
}

.car-tags {
    display: flex;
    gap: 8px;
    margin-bottom: 15px;
}

.tag {
    background: var(--bg-light);
    color: var(--text-light);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 12px;
}

.car-price {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.car-price .price {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.car-price .unit {
    font-size: 14px;
    color: var(--text-light);
}

.advantages {
    padding: 80px 0;
    background: var(--bg-dark);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.advantage-card {
    text-align: center;
    padding: 40px 30px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.advantage-card:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-5px);
}

.advantage-icon {
    margin-bottom: 25px;
}

.advantage-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 15px;
}

.advantage-desc {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
}

/* ==================== 标题字体大小调整 ==================== */
.advantage-section-title,
.process-section-title,
.car-show-title {
    font-size: 48px !important; /* 调整为48px */
}

.car-show-title,
.process-section-title {
    color: #000000 !important; /* 黑色字体 */
}

.advantage-section-title {
    color: #ffffff !important; /* 白色字体 */
}

@media (max-width: 768px) {
    .advantage-section-title,
    .process-section-title,
    .car-show-title {
        font-size: 36px !important;
    }
}

@media (max-width: 480px) {
    .advantage-section-title,
    .process-section-title,
    .car-show-title {
        font-size: 28px !important;
    }
}

/* ==================== 翻转卡片样式 ==================== */

.flip-card {
    background: transparent !important;
    perspective: 1000px;
    cursor: pointer;
    padding: 0 !important;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    min-height: 280px;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.flip-card.flipped .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 30px;
    box-sizing: border-box;
}

/* 卡片正面 - 蓝色系配色 */
.flip-card-front {
    background: linear-gradient(135deg, #165DFF 0%, #0B4EC7 100%);
    color: white;
}

.flip-card-front .advantage-icon svg {
    fill: #ffffff;
}

.flip-card-front .advantage-title {
    color: #ffffff;
    font-size: 24px;
    font-weight: 600;
    margin: 0;
}

/* 卡片背面 - 深蓝色 */
.flip-card-back {
    background: linear-gradient(135deg, #0B4EC7 0%, #083a9a 100%);
    color: white;
    transform: rotateY(180deg);
}

.flip-card-text {
    font-size: 15px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.95);
    text-align: center;
    margin: 0;
    padding: 0 10px;
}

/* 确保三张卡片背面文字大小完全一致 */
.flip-card-back .flip-card-text {
    font-size: 15px;
    line-height: 1.8;
    letter-spacing: 0.3px;
}

/* 响应式适配 - 翻转卡片 */
@media (max-width: 768px) {
    .flip-card-inner {
        min-height: 240px;
    }
    
    .flip-card-front,
    .flip-card-back {
        padding: 30px 20px;
    }
    
    .flip-card-front .advantage-title {
        font-size: 20px;
    }
    
    .flip-card-back .flip-card-text {
        font-size: 14px;
        line-height: 1.7;
    }
}

@media (max-width: 480px) {
    .flip-card-inner {
        min-height: 220px;
    }
    
    .flip-card-front,
    .flip-card-back {
        padding: 25px 15px;
    }
    
    .flip-card-front .advantage-title {
        font-size: 18px;
    }
    
    .flip-card-back .flip-card-text {
        font-size: 13px;
        line-height: 1.6;
    }
}

.popular-models {
    padding: 80px 0;
    background: var(--bg-light);
    scroll-margin-top: 100px;
}

.models-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.model-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    display: flex;
    transition: all 0.3s ease;
}

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

.model-image {
    width: 45%;
    height: 200px;
    flex-shrink: 0;
}

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

.model-info {
    padding: 25px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.model-meta {
    display: flex;
    gap: 20px;
    margin-bottom: 12px;
    font-size: 13px;
    color: var(--text-light);
}

.model-name {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.model-price {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.model-price .price {
    font-size: 26px;
    font-weight: 700;
    color: var(--primary-color);
}

.model-price .unit {
    font-size: 14px;
    color: var(--text-light);
}

.brand-strength {
    padding: 80px 0;
    background: var(--bg-dark);
}

.strength-content {
    display: flex;
    gap: 60px;
    align-items: flex-start; /* 改为顶部对齐 */
    margin-bottom: 60px;
}

.strength-left {
    flex: 1;
}

.strength-image {
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 25px;
}

.strength-image img {
    width: 100%;
    height: 280px;
    object-fit: cover;
}

.strength-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 15px;
}

.strength-desc {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
}

.strength-right {
    flex: 1;
}

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

.stat-item {
    text-align: center;
    padding: 30px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
}

/* 数据数字 - 醒目的蓝色 */
.stat-number {
    display: block;
    font-size: 42px;
    font-weight: 700;
    color: #165DFF; /* 使用品牌蓝色 */
    margin-bottom: 10px;
    text-shadow: 0 0 20px rgba(22, 93, 255, 0.3); /* 添加发光效果增强视觉吸引力 */
}

/* 标签文字 - 浅灰色，与数字形成对比 */
.stat-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5); /* 更浅的灰色 */
    font-weight: 400;
    letter-spacing: 0.5px;
}

.brand-logos {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 12px 8px;
    padding: 40px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.brand-logo {
    width: 100%;
    aspect-ratio: 1 / 1.15; /* 正六边形比例 */
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff !important;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s ease;
    cursor: pointer;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
    position: relative;
}

.brand-logo:hover {
    transform: scale(1.08);
    filter: brightness(1.1);
}

.brand-logo span {
    text-align: center;
    line-height: 1.2;
    color: #ffffff !important;
    z-index: 1;
    padding: 0 8px;
}

/* 蓝色系 - 8种随机蓝色 */
.brand-logo.color-1 { background: linear-gradient(135deg, #E3F2FD 0%, #BBDEFB 100%); }
.brand-logo.color-2 { background: linear-gradient(135deg, #BBDEFB 0%, #90CAF9 100%); }
.brand-logo.color-3 { background: linear-gradient(135deg, #90CAF9 0%, #64B5F6 100%); }
.brand-logo.color-4 { background: linear-gradient(135deg, #64B5F6 0%, #42A5F5 100%); }
.brand-logo.color-5 { background: linear-gradient(135deg, #42A5F5 0%, #2196F3 100%); }
.brand-logo.color-6 { background: linear-gradient(135deg, #2196F3 0%, #1E88E5 100%); }
.brand-logo.color-7 { background: linear-gradient(135deg, #1E88E5 0%, #1976D2 100%); }
.brand-logo.color-8 { background: linear-gradient(135deg, #1976D2 0%, #1565C0 100%); }

.process {
    padding: 80px 0;
    background: var(--white);
}

.process-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.process-card {
    text-align: center;
    padding: 40px 25px;
    background: linear-gradient(135deg, #165DFF 0%, #0B4EC7 100%); /* 蓝色渐变背景 */
    border-radius: 12px;
    position: relative;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.process-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(22, 93, 255, 0.4);
    background: linear-gradient(135deg, #1a6aff 0%, #0d5ad4 100%);
}

.process-number {
    position: absolute;
    top: 15px;
    left: 20px;
    font-size: 48px;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.15); /* 黑底上的浅色数字 */
}

.process-icon {
    margin-bottom: 20px;
}

.process-icon svg {
    fill: #ffffff; /* 白色图标，在蓝色背景上清晰可见 */
}

.process-title {
    font-size: 18px;
    font-weight: 600;
    color: #ffffff; /* 白色标题 */
    margin-bottom: 10px;
}

.process-desc {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7); /* 浅灰色描述文字 */
}

.footer {
    background: var(--bg-dark);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 40px;
}

.footer-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 20px;
}

.footer-desc {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-contact p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 8px;
}

.footer-contact strong {
    color: rgba(255, 255, 255, 0.8);
}

.footer-news {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.news-item {
    display: flex;
    flex-direction: column;
    gap: 5px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.news-item:hover .news-title {
    color: var(--primary-color);
}

.news-date {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
}

.news-title {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.5;
}

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

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

.footer-links a {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.mt-20 {
    margin-top: 20px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.copyright {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
}

.footer-social {
    display: flex;
    gap: 15px;
}

.footer-social .social-icon {
    color: rgba(255, 255, 255, 0.6);
}

.footer-social .social-icon:hover {
    color: var(--primary-color);
}

.privacy-link {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

@media (max-width: 1200px) {
    .cars-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 1024px) {
    .cars-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .process-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .strength-content {
        flex-direction: column;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* 筛选区样式 */
.filter-section {
    background: var(--bg-light);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 20px;
}

.filter-group {
    margin-bottom: 15px;
    padding-bottom: 12px;
    border-bottom: 1px solid #E0E0E0;
}

.filter-group:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.filter-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 10px;
    color: #000000;
}

/* 品牌索引 */
.brand-index {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 15px;
}

.index-item {
    padding: 6px 12px;
    background: var(--white);
    border: 1px solid #E0E0E0;
    border-radius: 4px;
    text-decoration: none;
    color: var(--text-light);
    font-size: 14px;
    transition: all 0.3s ease;
}

.index-item:hover,
.index-item.active {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

/* 品牌图标 */
.brand-icons {
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    gap: 10px;
}

.brand-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0;
    background: var(--white);
    border: 1px solid #E0E0E0;
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-dark);
    transition: all 0.3s ease;
    overflow: hidden;
    aspect-ratio: 1 / 1;
}

.brand-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    border-color: var(--primary-color);
}

.brand-logo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all 0.3s ease;
}

.brand-item:hover .brand-logo {
    transform: scale(1.1);
}

.brand-name {
    font-size: 14px;
    margin-top: 8px;
}

/* 价格选项 */
.price-options {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 15px;
}

.price-item {
    padding: 6px 10px;
    background: var(--white);
    border: 1px solid #E0E0E0;
    border-radius: 4px;
    text-decoration: none;
    color: var(--text-light);
    font-size: 14px;
    transition: all 0.3s ease;
}

.price-item:hover,
.price-item.active {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

/* 自定义价格 */
.price-custom {
    display: flex;
    align-items: center;
    gap: 10px;
}

.price-input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid #E0E0E0;
    border-radius: 4px;
    font-size: 14px;
}

.price-separator {
    color: var(--text-light);
}

.price-btn {
    padding: 8px 20px;
    font-size: 14px;
}

/* 级别选项 */
.level-options {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 15px;
}

.level-item {
    display: inline-block;
    padding: 6px 10px;
    background: var(--white);
    border: 1px solid #E0E0E0;
    border-radius: 4px;
    text-decoration: none;
    color: var(--text-light);
    font-size: 14px;
    transition: all 0.3s ease;
}

.level-item:hover,
.level-item.active {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

.level-icon {
    font-size: 14px;
    margin-right: 4px;
}

.level-name {
    font-size: 14px;
}

/* 能源选项 */
.energy-options {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 15px;
}

.energy-item {
    padding: 6px 10px;
    background: var(--white);
    border: 1px solid #E0E0E0;
    border-radius: 4px;
    text-decoration: none;
    color: var(--text-light);
    font-size: 14px;
    transition: all 0.3s ease;
    display: inline-block;
}

.energy-item:hover,
.energy-item.active {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

/* 其他筛选 */
.other-filters {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.filter-select {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.filter-select label {
    font-size: 14px;
    font-weight: 600;
    color: #000000;
}

.filter-select select {
    padding: 8px 12px;
    border: 1px solid #E0E0E0;
    border-radius: 4px;
    font-size: 14px;
    color: var(--text-light);
    background: var(--white);
    cursor: pointer;
    transition: all 0.3s ease;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666666' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.filter-select select:hover,
.filter-select select:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 2px rgba(22, 93, 255, 0.1);
    background: var(--white);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23165DFF' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
}

.filter-select option {
    background: var(--white);
    color: var(--text-dark);
    padding: 8px 12px;
}

/* 已选条件 */
.selected-conditions {
    background: var(--white);
    border: 1px solid #E0E0E0;
    border-radius: 8px;
    padding: 15px;
}

.conditions-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

.condition-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: var(--bg-light);
    border: 1px solid #E0E0E0;
    border-radius: 15px;
    font-size: 14px;
    color: var(--text-dark);
}

.condition-remove {
    cursor: pointer;
    color: var(--text-light);
    font-size: 16px;
    transition: color 0.3s ease;
}

.condition-remove:hover {
    color: #FF4D4F;
}

.clear-conditions {
    background: none;
    border: none;
    color: var(--primary-color);
    font-size: 14px;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.clear-conditions:hover {
    background: rgba(22, 93, 255, 0.1);
}

/* 车源展示区 */
.cars-display {
    background: var(--white);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow);
}

/* 顶部标签栏 */
.display-tabs {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #E0E0E0;
}

.tab-item {
    padding: 10px 20px;
    text-decoration: none;
    color: var(--text-light);
    font-size: 14px;
    font-weight: 500;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.tab-item:hover,
.tab-item.active {
    color: var(--primary-color);
    background: rgba(22, 93, 255, 0.1);
}

/* 右侧功能区 */
.display-functions {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
}

.function-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.function-item label {
    font-size: 14px;
    color: var(--text-light);
}

.sort-select {
    padding: 6px 12px;
    border: 1px solid #E0E0E0;
    border-radius: 4px;
    font-size: 14px;
    color: var(--text-dark);
    background: var(--white);
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.sort-select:hover,
.sort-select:focus {
    border-color: var(--primary-color);
    outline: none;
}

/* 车源卡片 */
.cars-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.car-card {
    background: var(--white);
    border: 1px solid #E0E0E0;
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.car-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.car-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.car-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.car-info {
    padding: 15px;
}

.car-name {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.car-meta {
    display: flex;
    gap: 15px;
    margin-bottom: 10px;
    font-size: 14px;
    color: var(--text-light);
}

.car-price {
    display: flex;
    align-items: baseline;
    gap: 4px;
    margin-bottom: 10px;
}

.car-price .price {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
}

.car-price .unit {
    font-size: 14px;
    color: var(--text-light);
}

.car-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tag {
    background: var(--bg-light);
    color: var(--text-light);
    padding: 3px 8px;
    border-radius: 3px;
    font-size: 12px;
}

@media (max-width: 1200px) {
    .cars-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header-top {
        display: none;
    }
    
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
        z-index: 1001;
        font-size: 24px;
        padding: 15px;
        margin-right: 10px;
        min-width: 44px;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    /* 移动端热门车型页面布局 */
    .cars-container {
        flex-direction: column;
        padding: 0 20px;
        gap: 20px;
    }
    
    .cars-sidebar {
        width: 100%;
        position: relative;
        top: 0;
    }
    
    .cars-main {
        padding: 20px;
    }
    
    .hot-cars-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .car-card {
        width: 100%;
        max-width: 100%;
        height: auto;
        min-height: 300px;
    }
    
    .car-image {
        height: 200px;
    }
    
    .cars-section h2 {
        font-size: 24px;
    }
    
    .cars-section p {
        font-size: 14px;
    }
    
    .navbar-icons {
        display: none;
    }
    
    .navbar-content {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0 20px;
    }
    
    .hero {
        margin-top: 90px;
        min-height: 250px;
        height: auto;
        position: relative;
        padding: 0;
    }
    
    .hero-bg {
        min-height: 250px;
    }
    
    .hero-bg img {
        width: 100%;
        height: 100%;
        object-fit: contain;
        object-position: center top;
    }
    
    .hero-content {
        transform: translateY(0);
        padding: 20px;
        position: relative;
        margin-top: 250px;
        text-align: center;
    }
    
    .title-box {
        background: transparent;
        backdrop-filter: none;
        padding: 10px 15px;
    }
    
    .hero-title {
        font-size: 20px;
        color: #000000;
        text-shadow: none;
        margin-bottom: 5px;
    }
    
    .hero-subtitle {
        font-size: 14px;
        color: #000000;
        opacity: 1;
    }
    
    .search-row {
        flex-direction: column;
    }
    
    .search-box {
        padding: 20px;
    }
    
    .btn-search {
        width: 100%;
    }
    
    .cars-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .models-grid {
        grid-template-columns: 1fr;
    }
    
    .model-card {
        flex-direction: column;
    }
    
    .model-image {
        width: 100%;
        height: 180px;
    }
    
    .process-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
        padding: 20px;
    }
    
    .stat-item {
        padding: 30px 20px;
        background: rgba(255, 255, 255, 0.1);
        border-radius: 12px;
    }
    
    .stat-number {
        font-size: 32px;
        font-weight: 700;
        color: #165DFF;
        margin-bottom: 8px;
    }
    
    .stat-label {
        font-size: 14px;
        color: rgba(255, 255, 255, 0.8);
    }
    
    .strength-image {
        margin-bottom: 20px;
    }
    
    .strength-image img {
        height: auto;
        max-height: 250px;
        object-fit: cover;
    }
    
    .strength-title {
        font-size: 20px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    
    .brand-logos {
        grid-template-columns: repeat(4, 1fr);
        gap: 8px 6px;
    }

    .brand-logo {
        font-size: 12px;
        aspect-ratio: 1 / 1.15;
    }

    .brand-logo span {
        padding: 0 4px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    /* 响应式筛选区 */
    .other-filters {
        grid-template-columns: 1fr;
    }
    
    .brand-icons {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .display-functions {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    /* 响应式容器 */
    .container {
        padding: 0 20px;
    }
    
    /* 响应式关于我们页面 */
    .about-content {
        flex-direction: column;
        padding: 0 20px;
    }
    
    .about-sidebar {
        width: 100%;
        position: static;
        margin-bottom: 20px;
    }
    
    /* 响应式联系我们页面 */
    .contact-content {
        flex-direction: column;
        padding: 0 20px;
    }
    
    .contact-sidebar {
        width: 100%;
        position: static;
        margin-bottom: 20px;
    }
    
    /* 响应式服务页面 */
    .services-content {
        flex-direction: column;
        padding: 0 20px;
    }
    
    .services-sidebar {
        width: 100%;
        position: static;
        margin-bottom: 20px;
    }
    
    /* 响应式车源页面 */
    .cars-content {
        flex-direction: column;
        padding: 0 20px;
    }
    
    .cars-sidebar {
        width: 100%;
        position: static;
        margin-bottom: 20px;
    }
}