/* Google Material Design 风格 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --google-blue: #1a73e8;
    --google-blue-light: #4285f4;
    --google-red: #ea4335;
    --google-yellow: #fbbc05;
    --google-green: #34a853;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --text-tertiary: #80868b;
    --surface: #ffffff;
    --surface-variant: #f8f9fa;
    --outline: #dadce0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--surface);
    -webkit-font-smoothing: antialiased;
}

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

/* 导航 - Google风格 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--surface);
    z-index: 1000;
    padding: 12px 0;
    border-bottom: 1px solid var(--outline);
}

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

.logo img {
    height: 36px;
    width: auto;
    display: block;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.25px;
    transition: color 0.2s;
    text-transform: uppercase;
}

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

/* 首屏 - Google风格白色背景 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: var(--surface);
    color: var(--text-primary);
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 20%;
    right: 10%;
    width: 200px;
    height: 200px;
    background: var(--google-blue);
    opacity: 0.08;
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 10%;
    left: 5%;
    width: 150px;
    height: 150px;
    background: var(--google-yellow);
    opacity: 0.1;
    border-radius: 50%;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 56px;
    font-weight: 400;
    margin-bottom: 16px;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.hero .subtitle {
    font-size: 24px;
    font-weight: 400;
    margin-bottom: 24px;
    color: var(--google-blue);
}

.hero .desc {
    font-size: 16px;
    max-width: 700px;
    margin: 0 auto;
    color: var(--text-secondary);
    line-height: 1.8;
    font-weight: 300;
}

/* 通用标题 */
.section-title {
    font-size: 32px;
    font-weight: 400;
    text-align: center;
    margin-bottom: 16px;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.section-desc {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 48px;
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1.7;
    font-weight: 300;
}

/* 关于我们 */
.about {
    padding: 80px 0;
    background: var(--surface-variant);
}

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

.about-content p {
    margin-bottom: 20px;
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    font-weight: 300;
}

/* 专业服务 - Google卡片风格 */
.services {
    padding: 80px 0;
    background: var(--surface);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--surface);
    padding: 32px 24px;
    border-radius: 16px;
    border: 1px solid var(--outline);
    transition: all 0.2s ease;
    text-align: center;
}

.service-card:hover {
    border-color: transparent;
    box-shadow: 0 1px 2px 0 rgba(60,64,67,0.3), 0 1px 3px 1px rgba(60,64,67,0.15);
}

.service-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 20px;
    color: var(--google-blue);
}

.service-icon svg {
    width: 100%;
    height: 100%;
}

.service-card:nth-child(2) .service-icon {
    color: var(--google-red);
}

.service-card:nth-child(3) .service-icon {
    color: var(--google-green);
}

.service-card h3 {
    font-size: 20px;
    font-weight: 500;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.service-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    font-weight: 300;
}

/* 合作伙伴 */
.partners {
    padding: 80px 0;
    background: var(--surface-variant);
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
}

.partner-card {
    background: var(--surface);
    padding: 24px 16px;
    border-radius: 12px;
    text-align: center;
    border: 1px solid var(--outline);
    transition: all 0.2s;
}

.partner-card:hover {
    box-shadow: 0 1px 2px 0 rgba(60,64,67,0.3), 0 1px 3px 1px rgba(60,64,67,0.15);
}

.partner-card h4 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.partner-card p {
    font-size: 12px;
    color: var(--text-tertiary);
    line-height: 1.5;
    font-weight: 300;
}

/* 联系我们 */
.contact {
    padding: 80px 0;
    background: var(--surface);
}

.contact-info {
    max-width: 640px;
    margin: 0 auto;
    background: var(--surface);
    border: 1px solid var(--outline);
    border-radius: 16px;
    overflow: hidden;
}

.contact-item {
    display: flex;
    padding: 20px 24px;
    border-bottom: 1px solid var(--outline);
    align-items: center;
}

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

.contact-item .label {
    width: 80px;
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 14px;
    flex-shrink: 0;
}

.contact-item .value {
    flex: 1;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 400;
}

.contact-item .phone {
    font-size: 18px;
    font-weight: 500;
    color: var(--google-blue);
}

/* 页脚 */
footer {
    background: var(--surface-variant);
    border-top: 1px solid var(--outline);
    padding: 32px 0;
    text-align: center;
}

footer p {
    font-size: 13px;
    color: var(--text-tertiary);
    margin: 4px 0;
    font-weight: 300;
}

.beian {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.beian img {
    height: 16px;
    width: auto;
    display: inline-block;
    vertical-align: middle;
}

.beian .divider {
    color: var(--outline);
}

/* 响应式 */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .partners-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero h1 {
        font-size: 36px;
    }
    
    .hero .subtitle {
        font-size: 20px;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .section-title {
        font-size: 28px;
    }
}

@media (max-width: 480px) {
    .partners-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        border-radius: 0;
        border-left: none;
        border-right: none;
    }
    
    .contact-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
    
    .contact-item .label {
        width: auto;
    }
}