/* ============================================
   跨设备响应式优化样式表
   ============================================ */

/* 基础设置 */
* {
    box-sizing: border-box;
}

/* 确保图片和媒体自适应 */
img, video, iframe {
    max-width: 100%;
    height: auto;
}

/* ============================================
   导航栏响应式优化
   ============================================ */

/* 平板设备 (768px - 1024px) */
@media (max-width: 1024px) and (min-width: 769px) {
    .nav-menu {
        padding: 0.5rem 1rem;
    }

    .nav-content {
        max-width: 100%;
        padding: 0 1rem;
    }

    .nav-brand h2 {
        font-size: 1.3rem;
    }

    .nav-links {
        gap: 0.8rem;
    }

    .nav-links li a {
        font-size: 0.9rem;
        padding: 0.5rem 0.8rem;
    }
}

/* 手机设备 (最大768px) */
@media (max-width: 768px) {
    .nav-menu {
        position: sticky;
        top: 0;
        z-index: 1000;
        background: white;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }

    .nav-content {
        flex-wrap: wrap;
        padding: 0.5rem;
    }

    .nav-brand h2 {
        font-size: 1.2rem;
    }

    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 0;
        padding: 1rem 0;
        overflow-y: auto;
        max-height: 70vh;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links li {
        width: 100%;
        text-align: center;
        border-bottom: 1px solid #f0f0f0;
    }

    .nav-links li:last-child {
        border-bottom: none;
    }

    .nav-links li a {
        display: block;
        padding: 1rem;
        font-size: 1rem;
        width: 100%;
    }

    .nav-actions {
        flex-direction: column;
        gap: 0.5rem;
        padding: 1rem;
    }

    .nav-actions button {
        width: 100%;
    }

    /* 移动端汉堡菜单按钮 */
    .mobile-menu-btn {
        display: block;
        position: absolute;
        right: 1rem;
        top: 50%;
        transform: translateY(-50%);
        background: none;
        border: none;
        font-size: 1.5rem;
        cursor: pointer;
        padding: 0.5rem;
    }

    .user-menu {
        flex-direction: column;
        align-items: center;
        gap: 0.5rem;
    }

    .user-dropdown {
        position: static;
        display: none;
        width: 100%;
        box-shadow: none;
        border: 1px solid #e0e0e0;
        border-radius: 8px;
    }

    .user-dropdown.active {
        display: block;
    }
}

/* 小屏手机 (最大480px) */
@media (max-width: 480px) {
    .nav-brand h2 {
        font-size: 1rem;
    }

    .nav-links li a {
        font-size: 0.9rem;
        padding: 0.8rem;
    }
}

/* ============================================
   Hero区域响应式
   ============================================ */

@media (max-width: 768px) {
    .header {
        padding: 3rem 1rem 2rem;
    }

    .hero-title {
        font-size: 1.8rem !important;
        line-height: 1.3;
    }

    .hero-subtitle {
        font-size: 0.95rem !important;
        line-height: 1.6;
    }

    .hero-actions {
        flex-direction: column;
        gap: 1rem;
    }

    .hero-actions button {
        width: 100%;
        justify-content: center;
    }

    .hero-stats {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 1rem;
    }

    .stat-value {
        font-size: 1.5rem !important;
    }

    .stat-label {
        font-size: 0.8rem !important;
    }
}

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

    .hero-stats {
        grid-template-columns: 1fr 1fr !important;
        gap: 0.8rem !important;
    }

    .stat-value {
        font-size: 1.3rem !important;
    }
}

/* ============================================
   卡片和网格响应式
   ============================================ */

@media (max-width: 1024px) {
    .features-grid,
    .card-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
}

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

    .section-header {
        padding: 0;
    }

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

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

/* ============================================
   表单响应式
   ============================================ */

@media (max-width: 768px) {
    .form-grid {
        grid-template-columns: 1fr !important;
        gap: 1rem;
    }

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

    .form-input,
    .form-select,
    .form-textarea {
        font-size: 16px; /* 防止iOS自动缩放 */
    }

    button {
        min-height: 44px; /* 触摸友好 */
    }
}

/* ============================================
   表格响应式
   ============================================ */

@media (max-width: 768px) {
    .data-table,
    .table-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    table {
        font-size: 0.85rem;
    }

    table th,
    table td {
        padding: 0.5rem;
        white-space: nowrap;
    }
}

/* ============================================
   按钮和操作响应式
   ============================================ */

@media (max-width: 768px) {
    .btn {
        font-size: 0.9rem;
        padding: 0.6rem 1rem;
    }

    .btn-sm {
        font-size: 0.85rem;
        padding: 0.5rem 0.8rem;
    }

    .action-buttons {
        flex-direction: column;
        gap: 0.5rem;
    }

    .action-buttons button {
        width: 100%;
    }
}

/* ============================================
   模态框响应式
   ============================================ */

@media (max-width: 768px) {
    .modal-content {
        width: 95% !important;
        max-width: none !important;
        margin: 1rem !important;
        max-height: 90vh;
        overflow-y: auto;
    }

    .modal-header {
        padding: 1rem;
    }

    .modal-body {
        padding: 1rem;
    }

    .modal-footer {
        padding: 1rem;
        flex-direction: column;
        gap: 0.5rem;
    }

    .modal-footer button {
        width: 100%;
    }
}

/* ============================================
   步骤导航响应式
   ============================================ */

@media (max-width: 768px) {
    .steps-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .steps {
        min-width: 500px;
        padding: 1rem;
    }

    .step {
        padding: 0.5rem;
    }

    .step-number {
        width: 28px;
        height: 28px;
        font-size: 0.9rem;
    }

    .step-title {
        font-size: 0.85rem;
    }
}

/* ============================================
   证据材料展示响应式
   ============================================ */

@media (max-width: 768px) {
    .evidence-section {
        padding: 1rem;
        margin-top: 2rem;
    }

    .evidence-card {
        padding: 1rem;
        margin-bottom: 1rem;
    }

    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
        margin-bottom: 1rem;
    }

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

    .feature-grid,
    .metrics-grid,
    .compliance-grid {
        grid-template-columns: 1fr;
        gap: 0.8rem;
    }

    .feature-item,
    .metric-item,
    .compliance-item {
        padding: 1rem;
    }

    .metric-value {
        font-size: 1.5rem;
    }

    .protection-item {
        flex-direction: column;
        text-align: left;
        padding: 1rem;
    }

    .protection-icon {
        margin-bottom: 0.5rem;
    }

    .compliance-item {
        flex-direction: column;
        text-align: center;
    }

    .compliance-icon {
        margin-bottom: 0.5rem;
    }
}

/* ============================================
   算法信息页面响应式
   ============================================ */

@media (max-width: 768px) {
    .algorithm-detail {
        padding: 1rem;
    }

    .detail-section {
        margin-bottom: 2rem;
    }

    .detail-section h3 {
        font-size: 1.2rem;
    }

    .code-block {
        font-size: 0.8rem;
        padding: 0.8rem;
        overflow-x: auto;
    }
}

/* ============================================
   数据管理页面响应式
   ============================================ */

@media (max-width: 768px) {
    .data-management-container {
        padding: 1rem;
    }

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

    .data-table {
        font-size: 0.85rem;
    }

    .pagination {
        flex-wrap: wrap;
        justify-content: center;
    }

    .pagination button {
        margin: 0.25rem;
        padding: 0.4rem 0.6rem;
        font-size: 0.85rem;
    }
}

/* ============================================
   文本和字体响应式
   ============================================ */

@media (max-width: 768px) {
    body {
        font-size: 14px;
        line-height: 1.6;
    }

    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    h4 {
        font-size: 1.1rem;
    }

    p {
        font-size: 0.95rem;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 13px;
    }

    h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.3rem;
    }

    h3 {
        font-size: 1.15rem;
    }
}

/* ============================================
   间距和布局响应式
   ============================================ */

@media (max-width: 768px) {
    .container,
    .content-container {
        padding: 1rem;
    }

    section {
        padding: 2rem 0;
    }

    .section-header {
        margin-bottom: 1.5rem;
    }

    .section-header h2 {
        margin-bottom: 0.5rem;
    }
}

/* ============================================
   触摸优化
   ============================================ */

@media (hover: none) and (pointer: coarse) {
    /* 增大触摸目标 */
    button,
    a,
    .btn {
        min-height: 44px;
        min-width: 44px;
        padding: 0.8rem 1rem;
    }

    /* 移除悬停效果 */
    .btn:hover,
    .card:hover {
        transform: none;
    }

    /* 添加触摸反馈 */
    button:active,
    a:active {
        opacity: 0.7;
    }
}

/* ============================================
   横屏模式优化
   ============================================ */

@media (max-width: 768px) and (orientation: landscape) {
    .hero-stats {
        grid-template-columns: repeat(4, 1fr) !important;
        gap: 0.5rem !important;
    }

    .header {
        padding: 1rem;
    }

    .hero-title {
        font-size: 1.4rem !important;
    }
}

/* ============================================
   打印样式
   ============================================ */

@media print {
    .nav-menu,
    .hero-actions,
    .mobile-menu-btn {
        display: none;
    }

    .header {
        page-break-after: avoid;
    }

    section {
        page-break-inside: avoid;
    }
}

/* ============================================
   辅助功能增强
   ============================================ */

/* 高对比度模式 */
@media (prefers-contrast: high) {
    .btn-primary {
        border: 2px solid #000;
    }

    .card {
        border: 2px solid #000;
    }
}

/* 减少动画（用户偏好） */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    body {
        background-color: #1a1a1a;
        color: #e0e0e0;
    }

    .nav-menu {
        background-color: #2d2d2d;
    }

    .card {
        background-color: #2d2d2d;
        border-color: #404040;
    }

    input,
    textarea,
    select {
        background-color: #2d2d2d;
        color: #e0e0e0;
        border-color: #404040;
    }
}