/* ==================== 全局样式 - 品牌官网风格 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #000000;
    --secondary-color: #1a1a1a;
    --accent-color: #0066ff;
    --bg-light: #ffffff;
    --bg-gray: #f5f5f5;
    --text-primary: #000000;
    --text-secondary: #666666;
    --gradient-brand: linear-gradient(135deg, #0066ff 0%, #00ccff 100%);
    --shadow-subtle: 0 2px 20px rgba(0, 0, 0, 0.08);
    --shadow-card: 0 4px 30px rgba(0, 0, 0, 0.12);
    --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-light);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 60px;
}

/* ==================== 导航栏 - 简约风格 ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    transition: var(--transition-smooth);
}

.navbar.scrolled {
    box-shadow: var(--shadow-subtle);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 60px;
}

.logo h1 {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--text-primary);
    margin: 0;
}

.logo span {
    font-size: 12px;
    color: var(--text-secondary);
    display: block;
    margin-top: 2px;
    letter-spacing: 2px;
}

.nav-links {
    display: flex;
    gap: 40px;
    align-items: center;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition-smooth);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: var(--transition-smooth);
}

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

.nav-link.cta {
    background: var(--accent-color);
    color: white;
    padding: 12px 28px;
    border-radius: 6px;
    font-weight: 600;
    box-shadow: var(--shadow-subtle);
}

.nav-link.cta:hover {
    background: #0055cc;
    transform: translateY(-2px);
    box-shadow: var(--shadow-card);
}

.nav-link.cta::after {
    display: none;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    z-index: 1001;
    padding: 10px;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.hamburger:hover {
    background: rgba(0, 0, 0, 0.1);
}

.hamburger span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-smooth);
    display: block;
}

/* 移动端菜单 */
.nav-links.active {
    display: flex !important;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    gap: 15px;
    z-index: 1000;
}

.nav-links.active .nav-link {
    padding: 12px 15px;
    border-radius: 8px;
    transition: background 0.3s;
}

.nav-links.active .nav-link:hover {
    background: var(--bg-gray);
}

.nav-links.active .nav-link.cta {
    background: var(--accent-color);
    color: white;
}

/* 汉堡菜单激活状态 */
.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* ==================== Hero Section - 大图背景风格 ==================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at 30% 50%, rgba(0, 102, 255, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 70% 80%, rgba(0, 204, 255, 0.06) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    width: 100%;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(0, 102, 255, 0.1);
    border-radius: 30px;
    font-size: 13px;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 30px;
    animation: fadeInUp 1s ease;
}

.hero-title {
    font-size: 72px;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -2px;
    margin-bottom: 30px;
    animation: fadeInUp 1s ease 0.2s backwards;
}

.gradient-text {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 50px;
    max-width: 600px;
    animation: fadeInUp 1s ease 0.3s backwards;
}

.hero-actions {
    display: flex;
    gap: 20px;
    animation: fadeInUp 1s ease 0.4s backwards;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 36px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    transition: var(--transition-smooth);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent-color);
    color: white;
    box-shadow: var(--shadow-subtle);
}

.btn-primary:hover {
    background: #0055cc;
    transform: translateY(-2px);
    box-shadow: var(--shadow-card);
}

.btn-secondary {
    background: white;
    color: var(--text-primary);
    border: 1px solid #e0e0e0;
}

.btn-secondary:hover {
    border-color: var(--text-primary);
    transform: translateY(-2px);
}

/* ==================== 产品展示框 - 现代卡片风格 ==================== */
.hero-product {
    background: white;
    border-radius: 20px;
    padding: 60px;
    margin-top: 80px;
    box-shadow: var(--shadow-card);
    animation: fadeInUp 1s ease 0.5s backwards;
}

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

.product-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.product-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    font-weight: 400;
}

.product-flow {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
    margin-bottom: 40px;
}

.flow-card {
    background: var(--bg-gray);
    border-radius: 16px;
    padding: 35px 25px;
    text-align: center;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.flow-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-brand);
    transform: scaleX(0);
    transition: var(--transition-smooth);
}

.flow-card:hover::before {
    transform: scaleX(1);
}

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

.flow-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 15px;
    opacity: 0.15;
    position: relative;
    z-index: 1;
}

.flow-icon {
    width: 70px;
    height: 70px;
    margin: -60px auto 20px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: var(--accent-color);
    box-shadow: var(--shadow-subtle);
    transition: var(--transition-smooth);
    position: relative;
    z-index: 2;
}

.flow-card:hover .flow-icon {
    background: var(--accent-color);
    color: white;
    transform: scale(1.1);
}

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

.flow-description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.flow-highlight {
    display: inline-block;
    padding: 6px 16px;
    background: var(--accent-color);
    color: white;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
}

.product-cta {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #e0e0e0;
}

.cta-content {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 12px 28px;
    background: var(--bg-gray);
    border-radius: 30px;
    color: var(--text-secondary);
    font-size: 14px;
    transition: var(--transition-smooth);
}

.cta-content:hover {
    background: var(--accent-color);
    color: white;
}

.cta-content i {
    font-size: 18px;
}

/* ==================== 统计数据 ==================== */
.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 80px;
    padding-top: 40px;
    border-top: 1px solid #e0e0e0;
    animation: fadeInUp 1s ease 0.6s backwards;
}

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

.stat-number {
    font-size: 56px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -1px;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ==================== Section 通用样式 ==================== */
section {
    padding: 120px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-badge {
    display: inline-block;
    padding: 8px 20px;
    background: rgba(0, 102, 255, 0.1);
    border-radius: 30px;
    font-size: 12px;
    font-weight: 600;
    color: var(--accent-color);
    letter-spacing: 2px;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.section-title {
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
}

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

.service-card {
    background: white;
    padding: 50px 40px;
    border-radius: 16px;
    transition: var(--transition-smooth);
    border: 1px solid #f0f0f0;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

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

.service-icon {
    width: 70px;
    height: 70px;
    background: var(--bg-gray);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}
    font-size: 28px;
    color: var(--accent-color);
    margin-bottom: 25px;
    transition: var(--transition-smooth);
}

.service-card:hover .service-icon {
    background: var(--accent-color);
    color: white;
}

.service-card h3 {
    font-size: 22px;
    font-weight: 600;
    margin: 15px 0;
    color: var(--text-primary);
}

.service-card p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 25px;
}

.service-link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    transition: var(--transition-smooth);
}

.service-link:hover {
    gap: 10px;
}

/* ==================== 营销咨询 ==================== */
.marketing-section {
    background: var(--bg-gray);
}

.marketing-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.marketing-visual {
    position: relative;
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.visual-container {
    width: 100%;
    height: 100%;
    background: white;
    border-radius: 20px;
    box-shadow: var(--shadow-card);
    display: flex;
    align-items: center;
    justify-content: center;
}

.circle-bg {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, var(--accent-color) 0%, #00ccff 100%);
    border-radius: 50%;
    position: relative;
    animation: pulse 3s ease-in-out infinite;
}

.stat-card {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    padding: 40px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-subtle);
}

.stat-value {
    font-size: 48px;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.feature-item {
    display: flex;
    gap: 25px;
    margin-bottom: 35px;
    align-items: flex-start;
}

.feature-icon {
    width: 50px;
    height: 50px;
    background: var(--accent-color);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: white;
    flex-shrink: 0;
}

.feature-content h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.feature-content p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ==================== 视频方案 ==================== */
.video-section {
    background: var(--bg-light);
}

.video-tabs {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 50px;
}

.tab-btn {
    padding: 12px 30px;
    border: none;
    background: var(--bg-gray);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border-radius: 8px;
    transition: var(--transition-smooth);
}

.tab-btn.active,
.tab-btn:hover {
    background: var(--accent-color);
    color: white;
}

.video-content {
    min-height: 400px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

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

.video-card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-subtle);
    transition: var(--transition-smooth);
}

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

.video-thumbnail {
    height: 220px;
    background: var(--gradient-brand);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.service-icon-wrapper {
    font-size: 70px;
    color: white;
    opacity: 0.9;
    animation: float 3s ease-in-out infinite;
}

.video-info {
    padding: 30px;
}

.video-info h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.video-info p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
}

.training-content {
    text-align: center;
    padding: 60px;
    background: white;
    border-radius: 16px;
}

.training-content h3 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.training-content p {
    color: var(--text-secondary);
    font-size: 16px;
    margin-bottom: 40px;
}

.feature-list {
    list-style: none;
    display: inline-block;
    text-align: left;
}

.feature-list li {
    padding: 12px 0;
    color: var(--text-primary);
    font-size: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.feature-list i {
    color: var(--accent-color);
}

/* ==================== 新零售 ==================== */
.retail-section {
    background: var(--bg-gray);
}

.retail-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    align-items: center;
}

.retail-tags {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.tag {
    padding: 20px 30px;
    background: white;
    border-radius: 10px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    box-shadow: var(--shadow-subtle);
    transition: var(--transition-smooth);
}

.tag:hover {
    background: var(--accent-color);
    color: white;
    transform: translateX(10px);
}

.retail-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
}

.retail-card {
    background: white;
    padding: 35px;
    border-radius: 12px;
    box-shadow: var(--shadow-subtle);
    transition: var(--transition-smooth);
}

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

.card-icon {
    width: 60px;
    height: 60px;
    background: var(--bg-gray);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--accent-color);
    margin-bottom: 20px;
}

.retail-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

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

/* ==================== 商用车 ==================== */
.truck-section {
    background: var(--bg-light);
}

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

.truck-card {
    background: white;
    padding: 50px 40px;
    border-radius: 16px;
    border: 1px solid #f0f0f0;
    transition: var(--transition-smooth);
}

.truck-card:hover {
    border-color: var(--accent-color);
    box-shadow: var(--shadow-card);
}

.truck-number {
    font-size: 56px;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 20px;
    opacity: 0.2;
}

.truck-card h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.truck-card p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
}

/* ==================== 海外辅导 ==================== */
.overseas-section {
    background: var(--accent-color);
    color: white;
    position: relative;
    overflow: hidden;
}

.overseas-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--accent-color) 0%, #00ccff 100%);
}

.map-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 70%, rgba(255,255,255,0.1) 0%, transparent 50%);
}

.overseas-content {
    position: relative;
    z-index: 2;
}

.overseas-content .section-title,
.overseas-content .section-subtitle {
    color: white;
}

.overseas-content .section-badge {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.overseas-features {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-top: 60px;
}

.feature-box {
    text-align: center;
    color: white;
}

.feature-box i {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-box h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 10px;
}

.feature-box p {
    font-size: 14px;
    opacity: 0.9;
}

/* ==================== 关于我们 ==================== */
.about-section {
    background: var(--bg-light);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-text h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.about-text p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-mission {
    background: var(--bg-gray);
    padding: 30px;
    border-radius: 12px;
    border-left: 4px solid var(--accent-color);
}

.about-mission h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.about-mission p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
}

.stat-box {
    background: white;
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow-subtle);
    transition: var(--transition-smooth);
}

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

.stat-icon {
    width: 60px;
    height: 60px;
    background: var(--bg-gray);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 24px;
    color: var(--accent-color);
}

.stat-box .stat-number {
    font-size: 42px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.stat-box .stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ==================== 联系我们 ==================== */
.contact-section {
    background: var(--bg-gray);
}

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

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.info-card {
    background: white;
    padding: 30px;
    border-radius: 12px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
    box-shadow: var(--shadow-subtle);
    transition: var(--transition-smooth);
}

.info-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-card);
}

.info-icon {
    width: 50px;
    height: 50px;
    background: var(--accent-color);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: white;
    flex-shrink: 0;
}

.info-content h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.info-content p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
}

.qq-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    margin-top: 10px;
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 13px;
}

.contact-form-wrapper {
    background: white;
    padding: 50px;
    border-radius: 16px;
    box-shadow: var(--shadow-card);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.form-group {
    position: relative;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px 20px;
    padding-left: 50px;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    transition: var(--transition-smooth);
    background: var(--bg-gray);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    background: white;
}

.form-group i {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 16px;
}

.form-group textarea i {
    top: 20px;
    transform: none;
}

.btn-submit {
    background: var(--accent-color);
    color: white;
    padding: 16px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-submit:hover {
    background: #0055cc;
    transform: translateY(-2px);
    box-shadow: var(--shadow-card);
}

/* ==================== Footer ==================== */
.footer {
    background: var(--secondary-color);
    color: white;
    padding: 80px 0 30px;
}

.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 15px;
    letter-spacing: -0.5px;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
}

.footer-links h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
}

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

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

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition-smooth);
}

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

.footer-contact p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
    transition: var(--transition-smooth);
}

.social-links a:hover {
    background: var(--accent-color);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 13px;
}

/* ==================== 回到顶部 ==================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 20px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
    box-shadow: var(--shadow-subtle);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: #0055cc;
    transform: translateY(-3px);
}

/* ==================== 动画 ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes bounceRight {
    0%, 100% {
        transform: translateX(0);
    }
    50% {
        transform: translateX(5px);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1200px) {
    .container {
        padding: 0 40px;
    }

    .hero-title {
        font-size: 60px;
    }

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

@media (max-width: 992px) {
    .nav-links {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .hero-title {
        font-size: 48px;
    }

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

    .marketing-content,
    .retail-content,
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }

    .services-grid,
    .video-grid,
    .truck-grid,
    .retail-cards,
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 12px;
    }

    section {
        padding: 30px 0;
    }

    /* 首屏优化 */
    .hero {
        padding: 60px 0 40px;
    }

    .hero-title {
        font-size: 24px;
        line-height: 1.3;
        margin-bottom: 12px;
    }

    .hero-subtitle {
        font-size: 13px;
        margin-bottom: 20px;
    }

    .hero-actions {
        flex-direction: column;
        gap: 10px;
    }

    .hero-actions .btn {
        width: 100%;
        text-align: center;
        padding: 12px 20px;
        font-size: 14px;
    }

    /* 产品流程四个小模块 - 两行显示 */
    .product-flow {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 8px;
        padding: 0;
    }

    .flow-card {
        padding: 12px 8px 8px;
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
        min-height: auto;
        position: relative;
        overflow: visible;
    }

    .flow-number {
        font-size: 14px;
        font-weight: 700;
        margin-bottom: 8px;
        margin-top: 0;
        color: var(--accent-color);
    }

    .flow-icon {
        width: 40px;
        height: 40px;
        border-radius: 50%;
        background: linear-gradient(135deg, var(--accent-color) 0%, #00ccff 100%);
        color: white;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 18px;
        margin: 0 auto 10px;
        flex-shrink: 0;
        box-shadow: 0 2px 8px rgba(0, 102, 255, 0.3);
    }

    .flow-title {
        font-size: 13px;
        margin-bottom: 6px;
        font-weight: 600;
        color: var(--text-primary);
        line-height: 1.3;
    }

    .flow-description {
        font-size: 10px;
        line-height: 1.4;
        color: var(--text-secondary);
        margin-bottom: 8px;
        flex-grow: 1;
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    .flow-highlight {
        background: var(--bg-gray);
        padding: 4px 10px;
        border-radius: 12px;
        font-size: 10px;
        color: var(--accent-color);
        font-weight: 600;
        white-space: nowrap;
        margin-top: auto;
    }

    /* 统计数据 - 一行显示 */
    .hero-stats {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 8px;
        padding: 12px 10px;
    }

    .stat-item {
        padding: 10px;
    }

    .stat-icon {
        width: 32px;
        height: 32px;
        font-size: 14px;
    }

    .stat-number {
        font-size: 20px !important;
        margin: 5px 0;
    }

    .stat-label {
        font-size: 10px !important;
    }

    /* 核心服务产品 - 两行显示 */
    .services-grid {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 10px;
    }

    /* 其他卡片保持单列 */
    .video-grid,
    .truck-grid,
    .retail-cards,
    .about-stats,
    .footer-top,
    .overseas-features {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .service-card,
    .video-card,
    .truck-card,
    .retail-card,
    .feature-item {
        padding: 12px;
    }

    /* 服务体系小字隐藏 */
    .service-card p {
        display: none;
    }

    .service-card h3 {
        font-size: 14px !important;
        margin-bottom: 8px !important;
    }

    .service-icon {
        width: 36px;
        height: 36px;
        font-size: 16px;
        margin-bottom: 10px;
    }

    .service-link {
        font-size: 11px;
        padding: 5px 10px;
    }

    /* 底部统计数据 - 手机版隐藏 */
    .about-stats {
        display: none !important;
    }

    /* 新零售 - 手机版只显示右侧卡片区 */
    .retail-content {
        grid-template-columns: 1fr !important;
        gap: 12px;
    }

    .retail-left {
        display: none !important;
    }

    .retail-cards {
        grid-template-columns: 1fr !important;
        gap: 12px;
    }

    .retail-card {
        padding: 15px;
    }

    .retail-card h3 {
        font-size: 15px !important;
        margin-bottom: 8px !important;
    }

    .retail-card p {
        font-size: 12px !important;
        line-height: 1.4;
    }
}

    /* 导航栏优化 */
    .navbar {
        padding: 12px 0;
    }

    .nav-links {
        display: none;
    }

    .hamburger {
        display: flex !important;
        position: relative;
        z-index: 1002;
        padding: 8px;
    }

    .hamburger span {
        width: 22px;
    }

    /* 表单优化 */
    .form-row {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .form-group input,
    .form-group textarea,
    .form-group select {
        padding: 10px 12px;
        font-size: 14px;
    }

    .btn-submit {
        padding: 12px 24px;
        font-size: 14px;
    }

    /* Footer优化 */
    .footer-top {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 30px 0;
    }

    .footer-bottom {
        padding: 20px 0;
        font-size: 12px;
    }

    /* 字体优化 */
    h2 {
        font-size: 20px !important;
        margin-bottom: 15px !important;
    }

    h3 {
        font-size: 16px !important;
        margin-bottom: 10px !important;
    }

    p {
        font-size: 13px !important;
        line-height: 1.5;
    }

    /* 统计数字优化 */
    .counter-number {
        font-size: 32px !important;
        margin-bottom: 5px;
    }

    .counter-label {
        font-size: 11px !important;
    }

    /* 列表优化 */
    ul, ol {
        padding-left: 20px;
    }

    li {
        margin-bottom: 5px;
        font-size: 13px;
    }

    /* 卡片标题优化 */
    .card-title {
        font-size: 16px !important;
        margin-bottom: 8px !important;
    }

    .card-text {
        font-size: 12px !important;
        line-height: 1.4;
    }
}