/* 全局样式 */
:root {
    --primary-color: #0d9488;
    --primary-dark: #0f766e;
    --primary-light: #14b8a6;
    --secondary-color: #059669;
    --accent-color: #10b981;
    --text-dark: #1f2937;
    --text-gray: #6b7280;
    --text-light: #9ca3af;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 导航栏 */
.navbar {
    background: var(--bg-white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.brand-icon {
    font-size: 32px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-menu a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

/* 首页横幅 */
.hero {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 50%, var(--secondary-color) 100%);
    color: white;
    padding: 100px 24px 80px;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 52px;
    font-weight: bold;
    margin-bottom: 16px;
}

.hero-subtitle {
    font-size: 22px;
    opacity: 0.95;
    margin-bottom: 40px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 36px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn:hover {
    transform: translateY(-2px);
}

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

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 80px;
    margin-top: 60px;
}

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

.stat-number {
    display: block;
    font-size: 42px;
    font-weight: bold;
}

.stat-label {
    font-size: 16px;
    opacity: 0.9;
}

/* 通用区块 */
section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-title {
    font-size: 36px;
    font-weight: bold;
    color: var(--text-dark);
    margin-bottom: 12px;
}

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

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

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 28px;
}

.product-card {
    background: white;
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    position: relative;
    overflow: hidden;
}

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

.product-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.product-icon {
    font-size: 56px;
    margin-bottom: 16px;
}

.product-card h3 {
    font-size: 20px;
    font-weight: bold;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.product-card > p {
    color: var(--text-gray);
    margin-bottom: 16px;
    line-height: 1.7;
}

.product-features {
    list-style: none;
    padding-top: 16px;
    border-top: 1px solid #e5e7eb;
}

.product-features li {
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 6px;
}

/* 核心优势 */
.advantage-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 32px;
}

.advantage-item {
    text-align: center;
    padding: 32px;
}

.advantage-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: bold;
    margin: 0 auto 20px;
}

.advantage-item h3 {
    font-size: 22px;
    font-weight: bold;
    color: var(--text-dark);
    margin-bottom: 12px;
}

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

/* 应用案例 */
.cases {
    background: var(--bg-light);
}

.case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.case-item {
    background: white;
    padding: 40px 32px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

.case-item:hover {
    transform: translateY(-4px);
}

.case-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.case-item h3 {
    font-size: 20px;
    font-weight: bold;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.case-item p {
    color: var(--text-gray);
}

/* 服务流程 */
.process {
    background: linear-gradient(135deg, #f0fdfa 0%, #ecfdf5 100%);
}

.process-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.step {
    text-align: center;
    padding: 24px;
    background: white;
    border-radius: 16px;
    box-shadow: var(--shadow);
    min-width: 140px;
}

.step-icon {
    font-size: 36px;
    margin-bottom: 12px;
}

.step-number {
    width: 36px;
    height: 36px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    margin: 0 auto 12px;
}

.step h3 {
    font-size: 16px;
    font-weight: bold;
    color: var(--text-dark);
    margin-bottom: 6px;
}

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

.step-arrow {
    font-size: 28px;
    color: var(--primary-color);
}

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

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

.contact-title {
    font-size: 36px;
    font-weight: bold;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.contact-desc {
    font-size: 18px;
    color: var(--text-gray);
    margin-bottom: 32px;
}

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

.contact-row {
    display: flex;
    align-items: center;
    gap: 16px;
}

.contact-icon {
    font-size: 32px;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-light);
    border-radius: 12px;
}

.contact-row strong {
    display: block;
    color: var(--text-dark);
    font-size: 14px;
    margin-bottom: 4px;
}

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

.cta-box {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 48px;
    border-radius: 24px;
    text-align: center;
    color: white;
}

.cta-box h3 {
    font-size: 28px;
    font-weight: bold;
    margin-bottom: 12px;
}

.cta-box > p {
    margin-bottom: 32px;
    opacity: 0.95;
}

.btn-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: white;
    color: var(--primary-color);
    padding: 18px 48px;
    border-radius: 50px;
    font-size: 20px;
    font-weight: bold;
    text-decoration: none;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.cta-note {
    margin-top: 20px;
    font-size: 14px;
    opacity: 0.85;
}

/* 页脚 */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 40px 24px;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 12px;
}

.footer-slogan {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 16px;
}

.footer-copy {
    font-size: 14px;
    opacity: 0.6;
}

/* 响应式 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-stats {
        flex-direction: column;
        gap: 32px;
    }

    .section-title {
        font-size: 28px;
    }

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

    .process-steps {
        flex-direction: column;
    }

    .step-arrow {
        transform: rotate(90deg);
    }
}