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

:root {
    --primary-color: #0066cc;
    --secondary-color: #004a99;
    --text-color: #333;
    --light-text: #666;
    --background-color: #f8f9fa;
    --white: #ffffff;
    --accent-color: #ff9800;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

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

/* 导航栏 */
.navbar {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-img {
    height: 45px;
    width: auto;
    object-fit: contain;
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

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

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

/* 英雄区 */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 150px 0 100px;
    text-align: center;
    margin-top: 60px;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero p {
    font-size: 1.5rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--white);
    padding: 15px 40px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.cta-button:hover {
    transform: translateY(-2px);
    background-color: #e68900;
}

/* 通用部分样式 */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: var(--text-color);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--primary-color);
    margin: 15px auto 0;
}

/* 服务卡片 */
.services {
    background-color: var(--background-color);
}

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

.service-card {
    background: var(--white);
    border-radius: 10px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: transform 0.3s ease;
}

.service-card:hover {
    transform: translateY(-10px);
}

.service-icon {
    color: var(--primary-color);
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-color);
}

.service-card p {
    color: var(--light-text);
    line-height: 1.8;
}

/* 标注案例 */
.cases {
    background-color: var(--white);
}

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

.case-card {
    background: var(--background-color);
    border-radius: 10px;
    padding: 40px 30px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: transform 0.3s ease;
}

.case-card:hover {
    transform: translateY(-5px);
}

.case-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.case-card p {
    color: var(--light-text);
    line-height: 1.8;
}

/* 优势部分 */
.advantages {
    background-color: var(--background-color);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.advantage-item {
    text-align: center;
    padding: 30px 20px;
    background: var(--white);
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
}

.advantage-icon {
    width: 80px;
    height: 80px;
    background-color: rgba(0, 102, 204, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: var(--primary-color);
}

.advantage-item h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--text-color);
}

.advantage-item p {
    color: var(--light-text);
    line-height: 1.6;
}

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

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

.contact-info h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: var(--text-color);
}

.contact-info > p {
    margin-bottom: 30px;
    color: var(--light-text);
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 15px;
    color: var(--text-color);
}

.contact-item svg {
    color: var(--primary-color);
    flex-shrink: 0;
}

.contact-form {
    background: var(--background-color);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 15px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-family: inherit;
    font-size: 1rem;
}

.contact-form textarea {
    resize: vertical;
}

.contact-form button {
    width: 100%;
    background-color: var(--primary-color);
    color: var(--white);
    padding: 15px;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.contact-form button:hover {
    background-color: var(--secondary-color);
}

/* 页脚 */
footer {
    background-color: #1a1a1a;
    color: #ccc;
    padding: 50px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    align-items: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-logo-img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.footer-logo .logo-text {
    color: var(--white);
}

.footer-links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.footer-links a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--white);
}

.footer-copyright {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #333;
}

/* 移动端菜单样式 */
.hamburger {
    display: none;
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--primary-color);
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    height: 100vh;
    background: var(--white);
    box-shadow: -5px 0 20px rgba(0,0,0,0.1);
    z-index: 1001;
    transition: right 0.3s ease;
    display: flex;
    flex-direction: column;
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu-header {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #e0e0e0;
}

.mobile-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.mobile-logo-img {
    height: 35px;
    width: auto;
}

.mobile-logo-text {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.close-menu {
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--text-color);
}

.mobile-nav-menu {
    flex: 1;
    padding: 20px;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.mobile-nav-link {
    display: block;
    padding: 15px 20px;
    text-decoration: none;
    color: var(--text-color);
    font-size: 1.1rem;
    font-weight: 500;
    border-radius: 10px;
    transition: all 0.3s ease;
    background: #f8f9fa;
}

.mobile-nav-link:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateX(10px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1.2rem;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        display: none;
    }

    .hamburger {
        display: block;
    }
    
    .services-grid,
    .cases-grid,
    .advantages-grid {
        grid-template-columns: 1fr;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .service-card,
    .case-card,
    .advantage-item {
        padding: 30px 20px;
    }

    .contact-form input,
    .contact-form textarea {
        padding: 12px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.5rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .service-card h3,
    .case-card h3,
    .advantage-item h3 {
        font-size: 1.2rem;
    }

    .cta-button {
        padding: 12px 25px;
        font-size: 0.9rem;
    }

    .hero {
        padding: 80px 0 40px;
    }

    .services-grid,
    .cases-grid,
    .advantages-grid {
        gap: 20px;
    }

    .service-card,
    .case-card,
    .advantage-item {
        padding: 25px 15px;
    }
}