/* ========== 基础重置 ========== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary: #e63946;
    --primary-dark: #c1121f;
    --secondary: #457b9d;
    --text: #1d3557;
    --text-light: #6c757d;
    --bg: #ffffff;
    --bg-light: #f8f9fa;
    --border: #dee2e6;
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --radius: 8px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
}

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

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

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

ul {
    list-style: none;
}

/* ========== 通用类 ========== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 5rem 0;
}

.section-title {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text);
}

.bg-light {
    background: var(--bg-light);
}

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

/* ========== 按钮 ========== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    text-align: center;
}

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

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

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

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

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-block {
    display: block;
    width: 100%;
}

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

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

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

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

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

/* ========== Hero 区域 ========== */
.hero {
    padding: 10rem 0 6rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    background-size: cover;
    background-position: center;
    color: white;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

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

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

/* ========== 页面标题 ========== */
.page-header {
    padding: 8rem 0 4rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    background-size: cover;
    background-position: center;
    color: white;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.page-header p {
    opacity: 0.9;
}

/* ========== 特色/优势 ========== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

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

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 0.5rem;
    color: var(--text);
}

.feature-card p {
    color: var(--text-light);
}

/* ========== 产品卡片 ========== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.products-grid-full {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

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

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

.product-image {
    height: 200px;
    overflow: hidden;
    background: 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-card h3 {
    padding: 1rem 1rem 0.5rem;
    color: var(--text);
}

.product-card > p {
    padding: 0 1rem 1rem;
    color: var(--text-light);
    font-size: 0.9rem;
}

.product-info {
    padding: 1.5rem;
}

.product-info h3 {
    padding: 0;
    margin-bottom: 0.5rem;
}

.product-info p {
    padding: 0;
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.product-features {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.product-features span {
    background: var(--bg-light);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--text-light);
}

/* ========== 产品分类标签 ========== */
.category-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.category-tab {
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--border);
    background: white;
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
}

.category-tab:hover,
.category-tab.active {
    border-color: var(--primary);
    color: var(--primary);
}

.category-tab.active {
    background: var(--primary);
    color: white;
}

/* ========== 品牌/机型 ========== */
.brands-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
}

.brand-item {
    background: white;
    padding: 1.5rem;
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow);
}

.brand-item h3 {
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.brand-item p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* ========== 关于我们 ========== */
.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    align-items: start;
}

.about-text h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text);
}

.about-text p {
    margin-bottom: 1rem;
    color: var(--text-light);
    line-height: 1.8;
}

.about-stats {
    display: grid;
    gap: 1.5rem;
}

.stat-item {
    background: var(--primary);
    color: white;
    padding: 1.5rem;
    border-radius: var(--radius);
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
}

.stat-label {
    opacity: 0.9;
}

/* 企业文化 */
.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.value-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow);
}

.value-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.value-card h3 {
    color: var(--primary);
    margin-bottom: 1rem;
}

.value-card p {
    color: var(--text-light);
}

/* 关于页面带图片布局 */
.about-content-with-image {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 3rem;
    align-items: center;
}

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

/* 统计数据网格 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.stats-grid .stat-item {
    background: var(--primary);
    color: white;
    padding: 2rem;
    border-radius: var(--radius);
    text-align: center;
}

/* 团队网格 */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    text-align: center;
}

.team-card {
    padding: 2rem;
}

.team-avatar {
    width: 150px;
    height: 150px;
    margin: 0 auto 1rem;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.team-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.team-role {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* 选择理由 */
.reasons-list {
    max-width: 800px;
    margin: 0 auto;
}

.reason-item {
    display: flex;
    gap: 2rem;
    padding: 2rem 0;
    border-bottom: 1px solid var(--border);
}

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

.reason-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary);
    opacity: 0.3;
    line-height: 1;
}

.reason-content h3 {
    margin-bottom: 0.5rem;
    color: var(--text);
}

.reason-content p {
    color: var(--text-light);
}

/* ========== 联系我们 ========== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
}

.contact-info h2 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
}

.contact-item {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.contact-icon {
    font-size: 1.5rem;
}

.contact-item h3 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.contact-item p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.contact-item a {
    color: var(--primary);
    font-weight: 500;
}

/* 表单 */
.contact-form-wrapper h2 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
}

.contact-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.1);
}

/* 地图 */
.map-section {
    height: 400px;
    background: var(--bg-light);
}

.map-container {
    height: 100%;
    background: linear-gradient(135deg, var(--secondary) 0%, var(--text) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.map-overlay {
    text-align: center;
}

.map-info {
    background: white;
    padding: 2rem 3rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
}

.map-info h3 {
    margin-bottom: 1rem;
    color: var(--text);
}

.map-info p {
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.map-info .btn {
    margin-top: 1rem;
}

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

.faq-item {
    background: white;
    padding: 1.5rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
}

.faq-item h3 {
    color: var(--primary);
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.faq-item p {
    color: var(--text-light);
}

/* ========== CTA ========== */
.cta {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    text-align: center;
}

.cta h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.cta p {
    opacity: 0.9;
    margin-bottom: 2rem;
}

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

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

/* ========== 页脚 ========== */
.footer {
    background: var(--text);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.footer-col h4 {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
}

.footer-col p {
    color: rgba(255,255,255,0.7);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.footer-col ul li {
    margin-bottom: 0.75rem;
}

.footer-col a {
    color: rgba(255,255,255,0.7);
}

.footer-col a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-bottom p {
    color: rgba(255,255,255,0.5);
    font-size: 0.9rem;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1rem;
        gap: 0;
        box-shadow: var(--shadow);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu li {
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--border);
    }

    .nav-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 2rem;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .about-content-with-image {
        grid-template-columns: 1fr;
    }

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

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

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

    .contact-form {
        grid-template-columns: 1fr;
    }

    .reason-item {
        flex-direction: column;
        gap: 1rem;
    }

    .category-tabs {
        gap: 0.5rem;
    }

    .category-tab {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .about-stats {
        grid-template-columns: 1fr;
    }

    .stat-item {
        display: flex;
        align-items: center;
        justify-content: space-between;
        text-align: left;
    }

    .stat-number {
        font-size: 2rem;
    }
}