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

:root {
    --primary-blue: #0f4c81;
    --light-blue: #1e88e5;
    --accent-blue: #42a5f5;
    --dark-gray: #2c3e50;
    --medium-gray: #607d8b;
    --light-gray: #eceff1;
    --white: #ffffff;
    --shadow-light: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-medium: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-heavy: 0 16px 48px rgba(0, 0, 0, 0.16);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-light);
    z-index: 1000;
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-blue);
    letter-spacing: 2px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark-gray);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: var(--transition);
}

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

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

/* 首屏 Banner 区 */
.hero {
    margin-top: 72px;
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #0f4c81 0%, #1e88e5 50%, #42a5f5 100%);
    opacity: 0.05;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(15, 76, 129, 0.1) 0%, transparent 70%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.6; }
    50% { transform: scale(1.1); opacity: 0.3; }
}

.hero-content {
    position: relative;
    text-align: center;
    z-index: 1;
    padding: 80px 24px;
}

.hero-title {
    font-size: clamp(28px, 4vw, 48px);
    font-weight: 800;
    color: var(--dark-gray);
    margin-bottom: 24px;
    line-height: 1.2;
    letter-spacing: 1px;
    white-space: nowrap;
    width: 100%;
    text-align: center;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--medium-gray);
    margin-bottom: 48px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.cta-button {
    display: inline-block;
    padding: 16px 48px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--light-blue) 100%);
    color: var(--white);
    text-decoration: none;
    font-weight: 600;
    font-size: 18px;
    border-radius: 8px;
    transition: var(--transition);
    box-shadow: var(--shadow-medium);
    position: relative;
    overflow: hidden;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: var(--transition);
}

.cta-button:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-heavy);
}

.cta-button:hover::before {
    left: 100%;
}

/* 核心业务矩阵区 */
.services {
    padding: 120px 0;
    background: var(--light-gray);
}

.section-title {
    text-align: center;
    font-size: 36px;
    font-weight: 700;
    color: var(--dark-gray);
    margin-bottom: 64px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue), var(--accent-blue));
    margin: 16px auto 0;
    border-radius: 2px;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.service-card {
    background: var(--white);
    border-radius: 16px;
    padding: 40px 32px;
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.04);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue), var(--accent-blue));
    opacity: 0;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-heavy);
}

.service-card:hover::before {
    opacity: 1;
}

.card-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(15, 76, 129, 0.1) 0%, rgba(66, 165, 245, 0.1) 100%);
    border-radius: 20px;
    color: var(--primary-blue);
    transition: var(--transition);
}

.card-icon svg {
    width: 40px;
    height: 40px;
}

.service-card:hover .card-icon {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--accent-blue) 100%);
    color: var(--white);
    transform: scale(1.1);
}

.card-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--dark-gray);
    margin-bottom: 16px;
}

.card-description {
    font-size: 15px;
    color: var(--medium-gray);
    line-height: 1.7;
    margin-bottom: 24px;
}

.product-button {
    display: inline-block;
    padding: 12px 32px;
    background: linear-gradient(135deg, var(--light-blue) 0%, var(--accent-blue) 100%);
    color: var(--white);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    border-radius: 8px;
    transition: var(--transition);
    box-shadow: var(--shadow-light);
}

.product-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--light-blue) 100%);
}

/* 页脚 */
.footer {
    background: var(--dark-gray);
    color: var(--white);
    padding: 64px 0 32px;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.footer-logo {
    font-size: 32px;
    font-weight: 800;
    letter-spacing: 3px;
    color: var(--accent-blue);
}

.footer-info {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.contact-item {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.8);
}

.contact-label {
    font-weight: 600;
    color: var(--accent-blue);
}

.copyright {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-title {
        font-size: 32px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .nav-links {
        display: none;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 32px;
        text-align: center;
    }
    
    .section-title {
        font-size: 28px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero-title {
        font-size: 24px;
    }
    
    .cta-button {
        padding: 14px 36px;
        font-size: 16px;
    }
    
    .service-card {
        padding: 32px 24px;
    }
}