/* 全局样式 */
:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --text-color: #1f2937;
    --light-text: #6b7280;
    --background: #ffffff;
    --section-bg: #f3f4f6;
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* 导航栏样式 */
.navbar {
    background: var(--background);
    box-shadow: 0 2px 4px 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: 1rem 2rem;
}

.logo h1 {
    font-size: 1.8rem;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

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

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

/* 按钮样式 */
.btn-primary {
    background: var(--primary-color);
    color: white !important;
    padding: 0.8rem 1.5rem;
    border-radius: 0.5rem;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

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

.btn-secondary {
    background: transparent;
    color: var(--primary-color) !important;
    padding: 0.8rem 1.5rem;
    border-radius: 0.5rem;
    text-decoration: none;
    border: 2px solid var(--primary-color);
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white !important;
}

/* 主页横幅样式 */
.hero {
    background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
    color: white;
    padding: 8rem 0 6rem;
    text-align: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-content .sub-text {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    color: rgba(255, 255, 255, 0.9);
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* 产品功能样式 */
.features {
    padding: 5rem 0;
    background: #f8f9fa;
}

.features h2 {
    text-align: center;
    margin-bottom: 4rem;
    font-size: 2.5rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease;
}

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

.feature-icon {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    color: #333;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.feature-card p {
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.feature-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.feature-list li {
    color: #666;
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.feature-list li::before {
    content: "✓";
    color: var(--primary-color);
    position: absolute;
    left: 0;
}

/* 响应式调整 */
@media (max-width: 1200px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        padding: 0 2rem;
    }
}

@media (max-width: 768px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
}

/* 核心优势样式 */
.advantages {
    padding: 5rem 0;
}

.advantages h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.advantage-item {
    padding: 2rem;
    border-radius: 1rem;
    background: var(--section-bg);
}

.advantage-content h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

/* 关于我们样式 */
.about {
    padding: 5rem 0;
    background: #f8f9fa;
}

.about h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    color: #333;
}

.about-intro {
    max-width: 1000px;
    margin: 0 auto 4rem;
    text-align: center;
}

.about-intro p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #666;
}

.about-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.about-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease;
    text-align: center;
}

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

.card-icon {
    color: #1a73e8;
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.about-card h3 {
    color: #333;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.about-card p {
    color: #666;
    line-height: 1.8;
}

/* 响应式调整 */
@media (max-width: 1200px) {
    .about-cards {
        grid-template-columns: repeat(3, 1fr);
        padding: 0 2rem;
    }
}

@media (max-width: 992px) {
    .about-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .about-cards {
        grid-template-columns: 1fr;
    }
    
    .about-intro {
        padding: 0 1.5rem;
    }
    
    .about-card {
        padding: 1.5rem;
    }
}

/* 联系我们样式 */
.contact {
    padding: 5rem 0;
    background: #fff;
}

.contact h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    color: #333;
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.contact-form {
    background: #fff;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.05);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #333;
    font-weight: 500;
}

.required {
    color: #e74c3c;
    margin-left: 0.2rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 0.5rem;
    font-size: 1rem;
    color: #333;
    transition: border-color 0.3s ease;
}

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

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #1a73e8;
}

.btn-submit {
    width: 100%;
    padding: 1rem;
    background: #1a73e8;
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.btn-submit:hover {
    background: #1557b0;
}

/* 成功弹窗样式 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
    max-width: 400px;
    width: 90%;
}

.modal-content h3 {
    color: #333;
    margin-bottom: 1rem;
}

.modal-content p {
    color: #666;
    margin-bottom: 1.5rem;
}

.btn-close {
    padding: 0.8rem 2rem;
    background: #1a73e8;
    color: white;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.btn-close:hover {
    background: #1557b0;
}

@media (max-width: 768px) {
    .contact-form {
        padding: 1.5rem;
    }
}

/* 弹窗样式 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
}

.modal-content {
    position: relative;
    background-color: #fff;
    margin: 5% auto;
    padding: 2rem;
    width: 90%;
    max-width: 500px;
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.close-button {
    position: absolute;
    right: 1.5rem;
    top: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--light-text);
}

.close-button:hover {
    color: var(--text-color);
}

/* 表单样式 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #e5e7eb;
    border-radius: 0.375rem;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* 成功提示样式 */
#successModal .modal-content {
    text-align: center;
    max-width: 400px;
}

#successModal h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

#successModal p {
    margin-bottom: 1.5rem;
    color: var(--light-text);
}

/* 页脚样式 */
.footer {
    background: #f8f9fa;
    padding: 2rem 0;
    margin-top: 2rem;
}

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

.copyright {
    color: #666;
    margin-bottom: 0.5rem;
}

.icp {
    color: #999;
    font-size: 0.9rem;
}

.icp a {
    color: #999;
    text-decoration: none;
    transition: color 0.3s ease;
}

.icp a:hover {
    color: #666;
}

@media (max-width: 768px) {
    .footer {
        padding: 1.5rem 0;
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .features-grid,
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
    
    .feature-list {
        padding-left: 0.5rem;
    }
    
    .modal-content {
        margin: 10% auto;
        padding: 1.5rem;
        width: 95%;
    }
}