/* 响应式设计 */

/* 大屏幕设备 (1200px 及以上) */
@media (min-width: 1200px) {
    .container {
        max-width: 1140px;
    }
    
    .hero-content h1 {
        font-size: 3.5rem;
    }
    
    .feature-items {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 中等屏幕设备 (992px - 1199px) */
@media (max-width: 1199px) and (min-width: 992px) {
    .container {
        max-width: 960px;
    }
    
    .feature-items {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 小屏幕设备 (768px - 991px) */
@media (max-width: 991px) and (min-width: 768px) {
    .container {
        max-width: 720px;
        padding: 0 15px;
    }
    
    .hero {
        padding: 60px 0;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .features {
        padding: 60px 0;
    }
    
    .features h2 {
        font-size: 2rem;
    }
    
    .feature-items {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
    
    .benefits {
        padding: 60px 0;
    }
    
    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 超小屏幕设备 (767px 及以下) */
@media (max-width: 767px) {
    .container {
        padding: 0 15px;
    }
    
    /* 导航栏 */
    .nav-container {
        flex-direction: column;
        gap: 1rem;
        padding: 0 15px;
    }
    
    .nav-logo h1 {
        font-size: 1.5rem;
    }
    
    /* 英雄区域 */
    .hero {
        padding: 40px 0;
    }
    
    .hero-content h1 {
        font-size: 2rem;
        line-height: 1.2;
    }
    
    .hero-content p {
        font-size: 1rem;
        padding: 0 1rem;
    }
    
    /* 功能区域 */
    .features {
        padding: 40px 0;
    }
    
    .features h2 {
        font-size: 1.8rem;
        margin-bottom: 2rem;
    }
    
    .features-grid {
        gap: 2rem;
    }
    
    .feature-category h3 {
        font-size: 1.5rem;
        margin-bottom: 1rem;
    }
    
    .feature-items {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .feature-card {
        padding: 1.5rem 1rem;
    }
    
    .feature-icon {
        font-size: 2.5rem;
    }
    
    .feature-card h4 {
        font-size: 1.1rem;
    }
    
    .feature-card p {
        font-size: 0.9rem;
    }
    
    /* 特性介绍 */
    .benefits {
        padding: 40px 0;
    }
    
    .benefits h2 {
        font-size: 1.8rem;
        margin-bottom: 2rem;
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .benefit-item {
        padding: 1.5rem;
    }
    
    .benefit-icon {
        font-size: 2.5rem;
    }
    
    /* 表单元素 */
    .btn {
        width: 100%;
        padding: 14px 20px;
        font-size: 1rem;
    }
    
    .form-input {
        padding: 14px 16px;
        font-size: 16px; /* 防止iOS缩放 */
    }
    
    .file-upload-label {
        padding: 1.5rem 1rem;
    }
}

/* 超小屏幕设备 (480px 及以下) */
@media (max-width: 480px) {
    .container {
        padding: 0 10px;
    }
    
    .nav-container {
        padding: 0 10px;
    }
    
    .hero-content h1 {
        font-size: 1.8rem;
    }
    
    .hero-content p {
        font-size: 0.95rem;
    }
    
    .features h2,
    .benefits h2 {
        font-size: 1.6rem;
    }
    
    .feature-category h3 {
        font-size: 1.3rem;
    }
    
    .feature-card,
    .benefit-item {
        padding: 1rem;
    }
    
    .feature-icon,
    .benefit-icon {
        font-size: 2rem;
    }
    
    .feature-card h4,
    .benefit-item h3 {
        font-size: 1rem;
    }
    
    .feature-card p,
    .benefit-item p {
        font-size: 0.85rem;
    }
}

/* 横屏模式优化 */
@media (max-height: 500px) and (orientation: landscape) {
    .hero {
        padding: 30px 0;
    }
    
    .hero-content h1 {
        font-size: 2rem;
        margin-bottom: 0.5rem;
    }
    
    .features,
    .benefits {
        padding: 40px 0;
    }
}

/* 打印样式 */
@media print {
    .navbar,
    .footer,
    .language-switcher {
        display: none;
    }
    
    .hero {
        background: none;
        color: black;
        padding: 20px 0;
    }
    
    .feature-card {
        box-shadow: none;
        border: 1px solid #ccc;
        break-inside: avoid;
    }
    
    .features-grid {
        display: block;
    }
    
    .feature-items {
        display: block;
    }
    
    .feature-card {
        margin-bottom: 1rem;
        page-break-inside: avoid;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .feature-card {
        border: 2px solid #000;
    }
    
    .btn {
        border: 2px solid #000;
    }
    
    .form-input {
        border: 2px solid #000;
    }
}

/* 减少动画模式支持 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .feature-card:hover {
        transform: none;
    }
    
    .benefit-item:hover {
        transform: none;
    }
    
    .btn:hover {
        transform: none;
    }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
    body {
        background-color: #1a202c;
        color: #e2e8f0;
    }
    
    .features {
        background: #2d3748;
    }
    
    .feature-card {
        background: #4a5568;
        border-color: #718096;
        color: #e2e8f0;
    }
    
    .feature-card h4 {
        color: #f7fafc;
    }
    
    .feature-card p {
        color: #cbd5e0;
    }
    
    .benefits {
        background: #1a202c;
    }
    
    .benefit-item {
        background: #2d3748;
        color: #e2e8f0;
    }
    
    .benefit-item h3 {
        color: #f7fafc;
    }
    
    .benefit-item p {
        color: #cbd5e0;
    }
    
    .form-input {
        background: #2d3748;
        border-color: #4a5568;
        color: #e2e8f0;
    }
    
    .file-upload-label {
        background: #2d3748;
        border-color: #4a5568;
        color: #e2e8f0;
    }
}