/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1a56db;
    --secondary-color: #f97316;
    --accent-color: #00d9ff;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #fff;
    --bg-light: #f8fafc;
    --bg-dark: #1a1a2e;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background: var(--bg-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

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

a:hover {
    text-decoration: underline;
}

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

/* 按钮 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    color: #fff;
    box-shadow: 0 4px 15px rgba(26, 86, 219, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #1e40af, var(--primary-color));
    transform: translateY(-2px);
    text-decoration: none;
    box-shadow: 0 6px 20px rgba(26, 86, 219, 0.4);
}

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

.btn-outline:hover {
    background: var(--primary-color);
    color: #fff;
    text-decoration: none;
}

.btn-small {
    padding: 8px 16px;
    font-size: 14px;
}

.btn-large {
    padding: 16px 32px;
    font-size: 18px;
}

.btn-full {
    width: 100%;
}

/* 顶部导航 */
.header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 20px;
}

.logo h1 {
    font-size: 24px;
    color: var(--primary-color);
}

.logo span {
    font-size: 12px;
    color: var(--text-light);
}

.nav {
    display: flex;
    gap: 30px;
}

.nav a {
    color: var(--text-color);
    font-weight: 500;
    padding: 8px 0;
    border-bottom: 2px solid transparent;
}

.nav a:hover,
.nav a.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    text-decoration: none;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.language-switch {
    font-size: 14px;
}

.language-switch .active {
    color: var(--primary-color);
    font-weight: 600;
}

.contact-quick {
    background: var(--secondary-color);
    color: #fff;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
}

/* 主横幅 */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, #1e40af 100%);
    color: #fff;
    padding: 150px 0 100px;
    margin-top: 70px;
}

.hero-content {
    max-width: 600px;
}

.hero h2 {
    font-size: 48px;
    margin-bottom: 20px;
}

.hero p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 30px;
}

.hero-buttons {
    display: flex;
    gap: 15px;
}

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

.hero .btn-outline {
    border-color: #fff;
    color: #fff;
}

.hero .btn-outline:hover {
    background: #fff;
    color: var(--primary-color);
}

/* 章节标题 */
.section-title {
    font-size: 36px;
    text-align: center;
    margin-bottom: 50px;
    color: var(--text-color);
}

/* 产品中心 */
.products {
    padding: 80px 0;
    background: var(--bg-light);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.product-card {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    transition: transform 0.3s, box-shadow 0.3s;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.12);
}

.product-image {
    height: 200px;
    background: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.product-info {
    padding: 20px;
}

.product-info h3 {
    font-size: 18px;
    margin-bottom: 10px;
}

.product-info p {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 15px;
}

/* 公司优势 */
.advantages {
    padding: 80px 0;
}

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

.advantage-item {
    text-align: center;
    padding: 30px;
}

.advantage-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.advantage-item h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

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

/* 服务支持 */
.services {
    padding: 80px 0;
    background: var(--bg-light);
}

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

.service-item {
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
}

.service-item h3 {
    font-size: 18px;
    margin-bottom: 15px;
    color: var(--primary-color);
}

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

/* 联系我们 */
.contact {
    padding: 80px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-info h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.contact-info p {
    margin-bottom: 20px;
}

.contact-info .phone {
    font-size: 28px;
    font-weight: 700;
    color: var(--secondary-color);
}

.contact-form {
    background: var(--bg-light);
    padding: 30px;
    border-radius: 12px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 16px;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* 页脚 */
.footer {
    background: #1e293b;
    color: #fff;
    padding: 60px 0 30px;
}

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

.footer-col h4 {
    font-size: 18px;
    margin-bottom: 20px;
}

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

.footer-col li {
    margin-bottom: 10px;
}

.footer-col a {
    color: #94a3b8;
}

.footer-col a:hover {
    color: #fff;
}

.footer-col p {
    color: #94a3b8;
    margin-bottom: 10px;
}

.footer-bottom {
    border-top: 1px solid #334155;
    padding-top: 20px;
    text-align: center;
    color: #94a3b8;
    font-size: 14px;
}

/* 响应式 */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav {
        gap: 15px;
    }
    
    .hero h2 {
        font-size: 32px;
    }
    
    .advantages-grid,
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .advantages-grid,
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
}

/* ==================== 产品详情页面 ==================== */
.product-detail {
    padding: 100px 0 60px;
}

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

.product-header h1 {
    font-size: 36px;
    color: var(--text-color);
    margin-bottom: 15px;
}

.product-header .slogan {
    font-size: 20px;
    color: var(--primary-color);
    font-weight: 600;
}

.product-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.product-gallery .main-image {
    background: var(--bg-light);
    border-radius: 12px;
    overflow: hidden;
}

.placeholder-image.large {
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    font-weight: bold;
    color: var(--primary-color);
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

.product-specs h2 {
    font-size: 22px;
    margin: 30px 0 15px;
    color: var(--text-color);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 10px;
}

.product-specs h2:first-child {
    margin-top: 0;
}

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

.features-list li {
    padding: 10px 0;
    font-size: 16px;
    border-bottom: 1px solid var(--border-color);
}

.specs-table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
}

.specs-table th,
.specs-table td {
    padding: 12px 15px;
    text-align: left;
    border: 1px solid var(--border-color);
}

.specs-table th {
    background: var(--bg-light);
    font-weight: 600;
}

.specs-table tr:hover td {
    background: #f8fafc;
}

.compare-table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
}

.compare-table th,
.compare-table td {
    padding: 15px;
    text-align: center;
    border: 1px solid var(--border-color);
}

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

.compare-table .highlight {
    background: #ecfdf5;
    color: var(--success-color);
    font-weight: 600;
}

.applications {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 15px 0;
}

.applications .tag {
    background: var(--bg-light);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    color: var(--text-light);
}

.product-cta {
    margin-top: 40px;
    display: flex;
    gap: 15px;
}

/* ==================== 联系页面 ==================== */
.page-banner {
    background: linear-gradient(135deg, var(--primary-color) 0%, #3b82f6 100%);
    color: #fff;
    padding: 120px 0 60px;
    text-align: center;
}

.page-banner h1 {
    font-size: 42px;
    margin-bottom: 15px;
}

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

.contact-page {
    padding: 60px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-info-detailed h2,
.contact-form-detailed h2 {
    font-size: 28px;
    margin-bottom: 30px;
    color: var(--text-color);
}

.contact-block {
    margin-bottom: 30px;
    padding: 20px;
    background: var(--bg-light);
    border-radius: 12px;
}

.contact-block h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.contact-block p {
    margin: 8px 0;
    color: var(--text-light);
}

.contact-block a {
    color: var(--primary-color);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.checkbox-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: normal;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
}

/* ==================== 服务卡片 ==================== */
.service-card {
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    transition: transform 0.3s, box-shadow 0.3s;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.12);
}

.service-icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.service-card h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--text-color);
}

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

/* ==================== 关于我们统计 ==================== */
.about-stats {
    display: flex;
    gap: 40px;
    margin-top: 30px;
}

.stat {
    text-align: center;
}

.stat .number {
    display: block;
    font-size: 48px;
    font-weight: 700;
    color: var(--primary-color);
}

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

/* ==================== 响应式调整 ==================== */
@media (max-width: 768px) {
    .product-content {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .checkbox-group {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .product-cta {
        flex-direction: column;
    }
}