/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #e5e5e5;
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

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

.logo-img {
    width: 40px;
    height: 40px;
}

.logo-text {
    font-size: 24px;
    font-weight: bold;
    color: #1976D2;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 30px;
}

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

.nav-link:hover {
    color: #1976D2;
}

.nav-login-btn {
    background: linear-gradient(135deg, #1976D2, #1565C0);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 25px;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.nav-login-btn:hover {
    transform: translateY(-2px);
}

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

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* 首页横幅 */
.hero-section {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #f6f7fb 0%, #e3f2fd 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: bold;
    color: #1976D2;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.3rem;
    color: #666;
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-bottom: 40px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: bold;
    color: #1976D2;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    color: #666;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

.btn-primary, .btn-secondary {
    padding: 15px 30px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, #1976D2, #1565C0);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(25, 118, 210, 0.3);
}

.btn-secondary {
    background: transparent;
    color: #1976D2;
    border: 2px solid #1976D2;
}

.btn-secondary:hover {
    background: #1976D2;
    color: white;
}

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

.hero-img {
    width: 100%;
    max-width: 500px;
    height: auto;
}

/* 功能特色 */
.features-section {
    padding: 80px 0;
    background: white;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: bold;
    color: #333;
    margin-bottom: 20px;
}

.section-subtitle {
    font-size: 1.2rem;
    color: #666;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature-card {
    text-align: center;
    padding: 40px 20px;
    border-radius: 20px;
    background: #f8f9fa;
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: bold;
    color: #333;
    margin-bottom: 15px;
}

.feature-desc {
    color: #666;
    line-height: 1.6;
}

/* 产品优势 */
.advantages-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #f6f7fb 0%, #e3f2fd 100%);
}

.advantages-content {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.advantage-item {
    display: flex;
    align-items: center;
    gap: 30px;
    padding: 30px;
    background: white;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.advantage-number {
    font-size: 3rem;
    font-weight: bold;
    color: #1976D2;
    min-width: 80px;
}

.advantage-text h3 {
    font-size: 1.5rem;
    font-weight: bold;
    color: #333;
    margin-bottom: 10px;
}

.advantage-text p {
    color: #666;
    line-height: 1.6;
}

/* 价格方案 */
.pricing-section {
    padding: 80px 0;
    background: white;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.pricing-card {
    background: white;
    border-radius: 20px;
    padding: 40px 30px;
    text-align: center;
    border: 2px solid #e5e5e5;
    position: relative;
    transition: transform 0.3s ease;
}

.pricing-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.pricing-card.featured {
    border-color: #1976D2;
    transform: scale(1.05);
}

.pricing-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #1976D2, #1565C0);
    color: white;
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: bold;
}

.pricing-title {
    font-size: 1.5rem;
    font-weight: bold;
    color: #333;
    margin-bottom: 20px;
}

.pricing-price {
    margin-bottom: 30px;
}

.price-currency {
    font-size: 1.5rem;
    color: #666;
}

.price-amount {
    font-size: 3rem;
    font-weight: bold;
    color: #1976D2;
}

.price-period {
    font-size: 1rem;
    color: #666;
}

.pricing-features {
    margin-bottom: 30px;
}

.feature-item {
    padding: 10px 0;
    color: #666;
}

.pricing-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #1976D2, #1565C0);
    color: white;
    border: none;
    border-radius: 10px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

.pricing-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(25, 118, 210, 0.3);
}

/* 联系我们 */
.contact-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #f6f7fb 0%, #e3f2fd 100%);
}

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

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.contact-item {
    text-align: center;
    padding: 30px;
    background: white;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.contact-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.contact-text h4 {
    font-size: 1.2rem;
    font-weight: bold;
    color: #333;
    margin-bottom: 10px;
}

.contact-text p {
    color: #666;
    margin-bottom: 10px;
}

.qr-code {
    width: 120px;
    height: 120px;
    border-radius: 10px;
    margin-top: 10px;
}

/* 登录模态框 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 0;
    border-radius: 20px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: 30px 30px 20px;
    border-bottom: 1px solid #e5e5e5;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.5rem;
    font-weight: bold;
    color: #333;
}

.modal-close {
    font-size: 2rem;
    color: #999;
    cursor: pointer;
    line-height: 1;
}

.modal-close:hover {
    color: #333;
}

.modal-body {
    padding: 30px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #333;
}

.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e5e5e5;
    border-radius: 10px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #1976D2;
}

.login-submit-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #1976D2, #1565C0);
    color: white;
    border: none;
    border-radius: 10px;
    font-weight: bold;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.login-submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(25, 118, 210, 0.3);
}

.login-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 0.9rem;
    color: #666;
}

.privacy-link {
    color: #1976D2;
    text-decoration: none;
}

.privacy-link:hover {
    text-decoration: underline;
}

/* 页脚 */
.footer {
    background: #333;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.footer-logo-img {
    width: 30px;
    height: 30px;
}

.footer-logo-text {
    font-size: 1.5rem;
    font-weight: bold;
    color: #1976D2;
}

.footer-desc {
    color: #ccc;
    line-height: 1.6;
}

.footer-section h4 {
    font-size: 1.2rem;
    font-weight: bold;
    margin-bottom: 20px;
    color: white;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

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

.footer-section ul li a:hover {
    color: #1976D2;
}

.social-links {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.social-link {
    color: #ccc;
    text-decoration: none;
    padding: 8px 12px;
    border: 1px solid #555;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.social-link:hover {
    color: #1976D2;
    border-color: #1976D2;
}

.footer-bottom, .footer-bottom a {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #555;
    color: #ccc;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        justify-content: center;
        gap: 20px;
    }
    
    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .advantage-item {
        flex-direction: column;
        text-align: center;
        gap: 20px;
    }
    
    .advantage-number {
        min-width: auto;
    }
    
    .pricing-card.featured {
        transform: none;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-primary, .btn-secondary {
        width: 100%;
        max-width: 300px;
    }
}

/* 滚动动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

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