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

body {
    font-family: 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    transition: all 0.3s ease;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo h2 {
    color: #2563eb;
    font-weight: 700;
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #2563eb;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #2563eb;
    transition: width 0.3s ease;
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* 主页横幅 */
.hero {
    min-height: 48vh;
    padding-top: 120px;
    padding-bottom: 24px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.hero-container {
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 32px;
    width: 100%;
    height: 100%;
}

.hero-content {
    max-width: 520px;
    margin: 0 auto;
    text-align: center;
    padding: 0 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
}

.hero-title {
    font-size: 2.1rem;
    font-weight: 700;
    color: white;
    margin-bottom: 1.3rem !important;
    line-height: 1.15;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.92);
    margin-bottom: 1.3rem !important;
    font-weight: 400;
    line-height: 1.3;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1.3rem !important;
}

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    cursor: pointer;
    text-align: center;
}

.btn-primary {
    background: #2563eb;
    color: white;
}

.btn-primary:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: #2563eb;
    transform: translateY(-2px);
}

/* 章节通用样式 */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.1rem;
    color: #6b7280;
    max-width: 600px;
    margin: 0 auto;
}

/* 关于我们 */
.about {
    padding: 4rem 0;
    background: #f8fafc;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.about-text {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.stat-item {
    text-align: center;
    background: white;
    padding: 2rem 1.5rem;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: #2563eb;
    margin-bottom: 0.8rem;
    line-height: 1;
}

.stat-label {
    font-size: 1.1rem;
    color: #6b7280;
    font-weight: 500;
}

/* 服务项目 */
.services {
    padding: 4rem 0;
    background: white;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.service-card {
    background: white;
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid #e5e7eb;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    border-color: #2563eb;
}

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.service-icon i {
    font-size: 2rem;
    color: white;
}

.service-card h3 {
    font-size: 1.5rem;
    color: #1f2937;
    margin-bottom: 1rem;
    font-weight: 600;
}

.service-card p {
    color: #6b7280;
    line-height: 1.6;
}

/* 联系我们 - 优化布局 */
.contact {
    padding: 3rem 0;
    background: #f8fafc;
}

.contact-content {
    display: flex;
    justify-content: center;
    align-items: center;
}

.contact-form {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 450px;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #2563eb;
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
    max-height: 120px;
}

/* 页脚 */
.footer {
    background: #1f2937;
    color: white;
    padding: 2rem 0 1rem;
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 2rem;
}

.footer-section {
    text-align: center;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: #f9fafb;
    font-size: 1.2rem;
}

.footer-section ul {
    list-style: none;
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
}

.footer-section ul li {
    margin-bottom: 0;
}

.footer-section ul li a {
    color: #d1d5db;
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 1rem;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.footer-section ul li a:hover {
    color: #2563eb;
    background: rgba(37, 99, 235, 0.1);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #374151;
    color: #9ca3af;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu .nav-item {
        margin: 1rem 0;
    }

    .nav-link {
        font-size: 1.1rem;
        padding: 0.5rem 1rem;
    }

    .hero {
        padding-top: 100px;
        min-height: 40vh;
    }

    .hero-container {
        padding: 0 4vw;
        width: 100%;
        height: 100%;
    }
    
    .hero-content {
        text-align: center;
        margin-bottom: 12px;
        padding: 20px 10px;
        width: 100%;
    }
    
    .hero-title {
        font-size: 1.6rem;
        margin-bottom: 0.8rem !important;
        line-height: 1.2;
    }
    
    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: 1rem !important;
        line-height: 1.4;
    }

    .hero-buttons {
        margin-top: 1.2rem !important;
    }

    .btn {
        padding: 12px 24px;
        font-size: 0.95rem;
    }

    .about {
        padding: 2rem 0;
    }

    .about-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 1rem;
        margin-top: 1.5rem;
    }

    .stat-item {
        padding: 1.8rem 1rem;
    }

    .stat-number {
        font-size: 2.2rem;
        margin-bottom: 0.5rem;
    }

    .stat-label {
        font-size: 0.9rem;
    }

    .services {
        padding: 2rem 0;
    }

    .services-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .service-card {
        padding: 2rem 1.5rem;
    }

    .service-icon {
        width: 60px;
        height: 60px;
        margin-bottom: 1rem;
    }

    .service-icon i {
        font-size: 1.5rem;
    }

    .service-card h3 {
        font-size: 1.3rem;
    }

    .service-card p {
        font-size: 0.95rem;
    }

    .contact {
        padding: 2rem 0;
    }

    .contact-form {
        padding: 1.5rem;
        max-width: 100%;
    }

    .form-group input,
    .form-group textarea {
        padding: 0.7rem;
        font-size: 0.95rem;
    }

    .form-group textarea {
        min-height: 70px;
    }

    .footer {
        padding: 1.5rem 0 1rem;
    }

    .section-header h2 {
        font-size: 1.8rem;
    }

    .section-header p {
        font-size: 1rem;
    }

    .container {
        padding: 0 15px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 10px;
    }

    .hero {
        min-height: 35vh;
        padding-top: 90px;
        padding-bottom: 6px;
    }
    
    .hero-content {
        padding: 0 2px;
        text-align: center;
        width: 100%;
    }
    
    .hero-title {
        font-size: 1.3rem;
        margin-bottom: 0.6rem !important;
    }
    
    .hero-subtitle {
        font-size: 0.9rem;
        margin-bottom: 0.8rem !important;
        line-height: 1.3;
    }

    .hero-buttons {
        margin-top: 0.8rem !important;
    }

    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
        width: 100%;
        max-width: 200px;
    }

    .about {
        padding: 1.5rem 0;
    }

    .about-stats {
        grid-template-columns: 1fr;
        gap: 1rem;
        margin-top: 1rem;
    }

    .stat-item {
        padding: 1.5rem;
    }

    .stat-number {
        font-size: 2rem;
        margin-bottom: 0.4rem;
    }

    .stat-label {
        font-size: 0.85rem;
    }

    .services {
        padding: 1.5rem 0;
    }

    .service-card {
        padding: 1.5rem 1rem;
    }

    .service-icon {
        width: 50px;
        height: 50px;
    }

    .service-icon i {
        font-size: 1.2rem;
    }

    .service-card h3 {
        font-size: 1.1rem;
    }

    .service-card p {
        font-size: 0.9rem;
    }

    .contact {
        padding: 1.5rem 0;
    }

    .contact-form {
        padding: 1.2rem;
    }

    .form-group input,
    .form-group textarea {
        padding: 0.6rem;
        font-size: 0.9rem;
    }

    .form-group textarea {
        min-height: 60px;
    }

    .section-header h2 {
        font-size: 1.5rem;
    }

    .section-header p {
        font-size: 0.9rem;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}