/* 响应式设计补充样式 */

/* 大屏幕 (1200px+) */
@media (min-width: 1200px) {
    .container {
        max-width: 1400px;
    }
    
    .home-container {
        grid-template-columns: 1fr 350px;
    }
    
    .videos-grid {
        grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    }
    
    .shorts-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

/* 中等屏幕 (768px - 1199px) */
@media (min-width: 768px) and (max-width: 1199px) {
    .nav-container {
        padding: 1rem 1.5rem;
    }
    
    .nav-search {
        margin: 0 1rem;
    }
    
    .home-container {
        grid-template-columns: 1fr 280px;
        gap: 1.5rem;
    }
    
    .content-section {
        padding: 1.5rem;
    }
    
    .content-section .section-header {
        padding: 1.5rem;
        margin: -1.5rem -1.5rem 1.5rem -1.5rem;
    }
    
    .videos-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
        gap: 1.5rem;
    }
    
    .shorts-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 0.25rem !important;
    }
}

/* 平板竖屏 (576px - 767px) */
@media (min-width: 576px) and (max-width: 767px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    
    .nav-search {
        order: 2;
        width: 100%;
        margin: 0;
    }
    
    .nav-menu {
        order: 1;
        width: 100%;
        justify-content: center;
    }
    
    .nav-user {
        order: 3;
    }
    
    .home-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .content-section {
        padding: 1rem;
    }
    
    .content-section .section-header {
        padding: 1rem;
        margin: -1rem -1rem 1rem -1rem;
    }
    
    .sidebar {
        order: -1;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }
    
    .videos-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 1rem;
    }
    
    .shorts-grid {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 1rem !important;
        padding: 1rem !important;
    }
    
    .video-categories {
        justify-content: center;
    }
    
    .create-post-actions {
        justify-content: center;
    }
    
    .post-image img {
        max-height: 250px;
        max-width: 100%;
    }
    
    .post-video video {
        max-width: 100%;
        max-height: 300px;
    }
}

/* 手机横屏 (480px - 575px) */
@media (min-width: 480px) and (max-width: 575px) {
    .nav-container {
        flex-wrap: wrap;
        padding: 0.75rem;
    }
    
    .nav-brand {
        font-size: 1.3rem;
    }
    
    .content-section {
        padding: 0.75rem;
    }
    
    .content-section .section-header {
        padding: 0.75rem;
        margin: -0.75rem -0.75rem 0.75rem -0.75rem;
    }
    
    .nav-menu {
        width: 100%;
        justify-content: space-around;
        margin: 0.5rem 0;
    }
    
    .nav-item {
        padding: 0.4rem;
        min-width: 60px;
    }
    
    .nav-item i {
        font-size: 1.1rem;
    }
    
    .nav-item span {
        font-size: 0.75rem;
    }
    
    .nav-search {
        width: 100%;
        margin: 0.5rem 0 0 0;
    }
    
    .home-container {
        grid-template-columns: 1fr;
        gap: 0.75rem;
        padding: 0.75rem 0;
    }
    
    .content-section {
        padding: 0.5rem;
    }
    
    .sidebar {
        order: -1;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.75rem;
    }
    
    .videos-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 0.75rem;
    }
    
    .shorts-grid {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 1rem !important;
        padding: 1rem !important;
    }
    
    .video-categories {
        gap: 0.25rem;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .category-btn {
        padding: 0.3rem 0.6rem;
        font-size: 0.8rem;
    }
    
    .create-post-actions {
        gap: 0.5rem;
        justify-content: center;
    }
    
    .action-btn {
        min-width: 60px;
        padding: 0.5rem;
    }
    
    .action-btn i {
        font-size: 1rem;
    }
    
    .action-btn span {
        font-size: 0.7rem;
    }
    
    .post-image img {
        max-height: 180px;
        max-width: 100%;
    }
}

/* 手机竖屏 (320px - 479px) */
@media (max-width: 479px) {
    .container {
        padding: 0 5px;
    }
    
    .nav-container {
        flex-direction: column;
        padding: 0.5rem;
        gap: 0.75rem;
    }
    
    .content-section {
        padding: 0.5rem;
    }
    
    .content-section .section-header {
        padding: 0.5rem;
        margin: -0.5rem -0.5rem 0.5rem -0.5rem;
    }
    
    .nav-brand {
        font-size: 1.2rem;
        align-self: center;
    }
    
    .nav-menu {
        width: 100%;
        justify-content: space-around;
        order: 1;
    }
    
    .nav-item {
        padding: 0.3rem;
        min-width: 50px;
    }
    
    .nav-item i {
        font-size: 1rem;
    }
    
    .nav-item span {
        font-size: 0.7rem;
    }
    
    .nav-search {
        width: 100%;
        order: 2;
        margin: 0;
    }
    
    .nav-search input {
        padding: 0.6rem 0.8rem;
        font-size: 0.9rem;
    }
    
    .nav-user {
        order: 3;
        align-self: center;
    }
    
    .user-dropdown {
        padding: 0.3rem;
    }
    
    .user-avatar {
        width: 28px;
        height: 28px;
    }
    
    .user-name {
        font-size: 0.9rem;
    }
    
    .home-container {
        grid-template-columns: 1fr;
        gap: 0.5rem;
        padding: 0.5rem 0;
    }
    
    .sidebar {
        order: -1;
        display: block;
    }
    
    .user-info-card,
    .trending-card,
    .suggestions-card {
        margin-bottom: 1rem;
    }
    
    .videos-grid {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
    
    .shorts-grid {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 1rem !important;
        padding: 1rem !important;
    }
    
    .video-categories {
        gap: 0.25rem;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .category-btn {
        padding: 0.25rem 0.5rem;
        font-size: 0.75rem;
    }
    
    .create-post-card {
        padding: 1rem;
    }
    
    .create-post-header {
        margin-bottom: 0.75rem;
    }
    
    .create-post-btn {
        padding: 0.6rem 0.8rem;
        font-size: 0.9rem;
    }
    
    .create-post-actions {
        gap: 0.25rem;
        justify-content: center;
    }
    
    .action-btn {
        min-width: 50px;
        padding: 0.4rem;
    }
    
    .action-btn i {
        font-size: 0.9rem;
    }
    
    .action-btn span {
        font-size: 0.65rem;
    }
    
    .post-card {
        padding: 1rem;
    }
    
    .post-header {
        margin-bottom: 0.75rem;
    }
    
    .post-image img {
        max-height: 200px;
        max-width: 100%;
    }
    
    .post-video video {
        max-width: 100%;
        max-height: 250px;
    }
    
    .post-actions-bar {
        gap: 0.5rem;
    }
    
    .video-card {
        margin-bottom: 0.5rem;
    }
    
    /* 视频页面侧边栏响应式 */
    .videos-layout {
        flex-direction: column;
        gap: 15px;
    }
    
    .videos-sidebar {
        width: 100%;
        position: static;
        order: 2;
    }
    
    .videos-main {
        order: 1;
    }
    
    .sidebar-menu {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .sidebar-item {
        flex: 1;
        min-width: calc(50% - 4px);
        justify-content: center;
        padding: 8px 12px;
        font-size: 13px;
    }
    
    .sidebar-item i {
        margin-right: 6px;
        font-size: 14px;
    }
    
    /* 短视频页面侧边栏响应式 */
    .shorts-layout {
        flex-direction: column;
        gap: 15px;
    }
    
    .shorts-sidebar {
        width: 100%;
        position: static;
        order: 2;
    }
    
    .shorts-main {
        order: 1;
    }
    
    .video-info {
        padding: 0.75rem;
    }
    
    .video-title h3 {
        font-size: 0.9rem;
    }
    
    .video-stats {
        gap: 0.5rem;
        font-size: 0.75rem;
    }
    
    .short-card {
        margin-bottom: 0.5rem;
    }
    
    .short-info {
        padding: 0.75rem;
    }
    
    .short-title h3 {
        font-size: 0.8rem;
    }
    
    .short-stats {
        gap: 0.5rem;
    }
    
    .stat-item {
        font-size: 0.75rem;
    }
    
    .short-actions {
        gap: 0.25rem;
    }
    
    .modal-content {
        width: 95%;
        margin: 0.5rem;
    }
    
    .modal-header {
        padding: 1rem;
    }
    
    .modal-body {
        padding: 1rem;
    }
    
    .modal-footer {
        padding: 1rem;
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .btn {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }
    
    .form-group {
        margin-bottom: 1rem;
    }
    
    .form-group input,
    .form-group textarea,
    .form-group select {
        padding: 0.6rem;
        font-size: 0.9rem;
    }
    
    .file-upload-area {
        padding: 1rem;
    }
    
    .upload-placeholder i {
        font-size: 1.5rem;
    }
    
    .upload-placeholder p {
        font-size: 0.9rem;
    }
    
    .upload-placeholder small {
        font-size: 0.8rem;
    }
}

/* 超小屏幕 (小于320px) */
@media (max-width: 319px) {
    .container {
        padding: 0 2px;
    }
    
    .nav-container {
        padding: 0.25rem;
    }
    
    .nav-brand {
        font-size: 1rem;
    }
    
    .nav-item {
        min-width: 40px;
        padding: 0.2rem;
    }
    
    .nav-item i {
        font-size: 0.9rem;
    }
    
    .nav-item span {
        font-size: 0.6rem;
    }
    
    .nav-search input {
        padding: 0.5rem 0.6rem;
        font-size: 0.8rem;
    }
    
    .user-avatar {
        width: 24px;
        height: 24px;
    }
    
    .user-name {
        font-size: 0.8rem;
    }
    
    .videos-grid,
    .shorts-grid {
        grid-template-columns: 1fr;
    }
    
    .create-post-actions {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .action-btn {
        width: 100%;
        min-width: auto;
    }
    
    .modal-content {
        width: 98%;
        margin: 0.25rem;
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: 0.75rem;
    }
}

/* 横屏模式优化 */
@media (orientation: landscape) and (max-height: 500px) {
    .auth-container {
        padding: 1rem;
    }
    
    .auth-card {
        max-height: 95vh;
        overflow-y: auto;
    }
    
    .auth-header {
        padding: 1rem 2rem 0.5rem;
    }
    
    .auth-form {
        padding: 1rem 2rem;
    }
    
    .auth-footer {
        padding: 0.5rem 2rem 1rem;
    }
}

/* 高分辨率屏幕优化 */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .user-avatar,
    .author-avatar {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: -ms-interpolation-mode: nearest-neighbor;
        image-rendering: pixelated;
    }
    
    .video-thumbnail img,
    .short-video video {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: -ms-interpolation-mode: nearest-neighbor;
        image-rendering: pixelated;
    }
}

/* 打印样式 */
@media print {
    .navbar,
    .sidebar,
    .modal,
    .image-viewer {
        display: none !important;
    }
    
    .main-feed {
        width: 100% !important;
    }
    
    .post-card,
    .video-card,
    .short-card {
        break-inside: avoid;
        margin-bottom: 1rem;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
}

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

/* 高对比度模式 */
@media (prefers-contrast: high) {
    .btn-primary {
        background: #000;
        color: #fff;
        border: 2px solid #000;
    }
    
    .btn-outline {
        border: 2px solid #000;
        color: #000;
    }
    
    .nav-item.active {
        background: #000;
        color: #fff;
    }
    
    .action-btn.liked {
        color: #000;
        font-weight: bold;
    }
}