/* =============================================
   移动端全面优化 - 2024最佳实践
   基于响应式设计原则和WCAG 2.1标准
   ============================================= */

/* =============================================
   1. 全局移动端基础优化
   ============================================= */
@media (max-width: 768px) {
    /* 导航栏优化 */
    .navbar {
        padding: 8px 12px;
        height: auto;
        min-height: 56px;
    }
    
    .navbar-brand {
        font-size: 1rem;
    }
    
    .navbar-brand .logo {
        font-size: 1.2rem;
    }
    
    .navbar-menu {
        display: none;
    }
    
    .navbar-search {
        flex: 1;
        max-width: 200px;
        margin: 0 8px;
    }
    
    .search-box input {
        font-size: 14px;
        padding: 8px 12px;
    }
    
    .navbar-actions {
        gap: 4px;
    }
    
    .navbar-actions .btn {
        padding: 6px 12px;
        font-size: 0.8rem;
    }
    
    /* 用户头像下拉菜单优化 */
    .user-dropdown-menu {
        position: fixed;
        top: 56px;
        left: 0;
        right: 0;
        width: 100%;
        border-radius: 0 0 16px 16px;
        max-height: 60vh;
        overflow-y: auto;
    }
    
    /* 页面容器优化 */
    .page-container {
        padding: 12px;
        padding-bottom: calc(70px + env(safe-area-inset-bottom, 0px));
    }
    
    /* 卡片圆角优化 */
    .card, .content-section, .sidebar-card {
        border-radius: 12px;
    }
    
    /* 按钮触摸优化 */
    .btn {
        min-height: 44px;
        padding: 10px 16px;
    }
    
    /* 表单优化 */
    .form-input, .form-select, .form-textarea {
        font-size: 16px; /* 防止iOS自动缩放 */
        padding: 12px;
    }
}

/* =============================================
   2. 首页移动端优化
   ============================================= */
@media (max-width: 768px) {
    /* 主布局 */
    .main-content {
        display: block;
    }
    
    .right-sidebar {
        display: none;
    }
    
    /* 轮播图优化 */
    .hero-banner {
        margin: -12px -12px 16px;
        border-radius: 0;
    }
    
    .carousel {
        aspect-ratio: 16/9;
    }
    
    .carousel-item .carousel-content {
        padding: 16px;
    }
    
    .carousel-item h3 {
        font-size: 1.1rem;
        line-height: 1.3;
    }
    
    .carousel-item p {
        font-size: 0.85rem;
        -webkit-line-clamp: 2;
    }
    
    .carousel-control {
        width: 32px;
        height: 32px;
    }
    
    /* 快捷分类 */
    .quick-categories {
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
        padding: 12px;
    }
    
    .quick-category-item {
        padding: 12px 8px;
        border-radius: 10px;
    }
    
    .quick-category-icon {
        width: 36px;
        height: 36px;
        font-size: 1rem;
    }
    
    .quick-category-name {
        font-size: 0.75rem;
        margin-top: 6px;
    }
    
    /* 图书卡片网格 */
    .book-cards-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
    }
    
    .book-card {
        border-radius: 10px;
    }
    
    .book-card .cover {
        aspect-ratio: 3/4;
        border-radius: 8px;
    }
    
    .book-card .title {
        font-size: 0.8rem;
        -webkit-line-clamp: 2;
    }
    
    .book-card .author {
        font-size: 0.7rem;
    }
    
    /* 漫画专区 */
    .comics-section {
        gap: 10px;
    }
    
    .comics-item {
        padding: 10px;
        gap: 10px;
    }
    
    .comics-item .cover {
        width: 50px;
        height: 67px;
    }
    
    .comics-item .title {
        font-size: 0.85rem;
    }
    
    .comics-item .author {
        font-size: 0.7rem;
    }
    
    .comics-item .intro {
        font-size: 0.65rem;
        -webkit-line-clamp: 2;
    }
    
    /* 最新上传 */
    .new-books-page {
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
    }
    
    .new-book-item {
        padding: 10px;
        gap: 10px;
    }
    
    .new-book-item .cover {
        width: 50px;
        height: 67px;
    }
    
    /* 排行榜侧边栏替代 - 移动端显示为横向标签 */
    .sidebar-card {
        margin-bottom: 16px;
    }
    
    .sidebar-rank-list {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }
    
    .sidebar-rank-list li {
        padding: 8px;
        background: var(--bg-secondary);
        border-radius: 8px;
    }
}

/* 小屏幕手机优化 */
@media (max-width: 375px) {
    .book-cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .quick-categories {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .carousel-item h3 {
        font-size: 1rem;
    }
    
    .carousel-item p {
        display: none;
    }
}

/* =============================================
   3. 图书详细页移动端优化
   ============================================= */
@media (max-width: 768px) {
    .book-detail-page {
        padding: 0;
    }
    
    /* 图书头部 */
    .book-header {
        flex-direction: column;
        align-items: flex-start;
        padding: 16px;
        gap: 16px;
    }
    
    .book-header .cover-wrapper {
        width: 100%;
        display: flex;
        gap: 16px;
    }
    
    .book-cover-large {
        width: 100px;
        height: 140px;
        flex-shrink: 0;
    }
    
    .book-header-info {
        flex: 1;
        min-width: 0;
    }
    
    .book-header-info h1 {
        font-size: 1.2rem;
        line-height: 1.4;
        margin-bottom: 8px;
    }
    
    .book-meta-info {
        gap: 6px;
    }
    
    .book-meta-info .meta-item {
        font-size: 0.8rem;
    }
    
    /* 评分区域 */
    .book-rating-section {
        padding: 16px;
        margin: 0;
        border-radius: 0;
    }
    
    .rating-container {
        flex-direction: row;
        gap: 16px;
        align-items: center;
    }
    
    .rating-score {
        font-size: 2rem;
    }
    
    /* 操作按钮 */
    .book-actions {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 8px;
        padding: 12px 16px;
        position: sticky;
        bottom: 0;
        background: var(--bg-primary);
        border-top: 1px solid var(--border-color);
        z-index: 100;
    }
    
    .book-actions .btn {
        padding: 12px;
        font-size: 0.85rem;
    }
    
    .book-actions .btn-read {
        grid-column: span 2;
    }
    
    /* 图书简介 */
    .book-intro {
        padding: 16px;
        margin: 0;
    }
    
    .book-intro .intro-content {
        font-size: 0.9rem;
        line-height: 1.8;
    }
    
    /* 章节列表 */
    .book-chapters {
        padding: 16px;
        margin: 0;
    }
    
    .chapter-list {
        grid-template-columns: 1fr;
        gap: 4px;
    }
    
    .chapter-item {
        padding: 12px;
        font-size: 0.9rem;
        border-radius: 8px;
    }
    
    /* 标签页 */
    .book-tabs {
        position: sticky;
        top: 56px;
        z-index: 50;
        background: var(--bg-primary);
        padding: 0 16px;
    }
    
    .book-tabs .tab-btn {
        padding: 12px 16px;
        font-size: 0.9rem;
    }
    
    /* 相似图书 */
    .similar-books {
        padding: 16px;
    }
    
    .similar-books-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
    }
}

/* =============================================
   4. 阅读页移动端优化
   ============================================= */
@media (max-width: 768px) {
    /* Vue阅读器容器 */
    .book-reader {
        padding-top: 56px;
    }
    
    .reader-header {
        height: 56px;
        padding: 0 12px;
    }
    
    .reader-header .book-title {
        font-size: 0.9rem;
        max-width: 150px;
    }
    
    .reader-header .header-btn {
        width: 36px;
        height: 36px;
    }
    
    .reader-content {
        height: calc(100vh - 56px);
    }
    
    /* TXT阅读器 */
    .txt-reader {
        padding: 0;
    }
    
    .txt-sidebar {
        position: fixed;
        left: 0;
        top: 56px;
        bottom: 0;
        width: 280px;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 1000;
    }
    
    .txt-sidebar.show {
        transform: translateX(0);
    }
    
    .txt-main {
        margin-left: 0;
        padding: 16px;
    }
    
    .txt-content {
        padding: 16px;
        font-size: 1rem;
        line-height: 1.8;
    }
    
    .chapter-title {
        font-size: 1.2rem;
    }
    
    /* 底部工具栏 */
    .txt-toolbar {
        left: 0;
        right: 0;
        height: auto;
        padding: 12px;
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .toolbar-group {
        gap: 6px;
    }
    
    .toolbar-btn {
        width: 40px;
        height: 40px;
    }
    
    .encoding-select {
        font-size: 0.75rem;
        padding: 6px 8px;
    }
    
    /* PDF阅读器 */
    .pdf-reader {
        padding: 0;
    }
    
    .pdf-toolbar {
        padding: 8px;
        gap: 8px;
    }
    
    .pdf-toolbar button {
        padding: 8px 12px;
        font-size: 0.8rem;
    }
    
    /* EPUB阅读器 */
    .epub-reader {
        padding: 0;
    }
    
    .epub-toolbar {
        flex-wrap: wrap;
        padding: 8px;
    }
    
    /* 摸鱼模式 */
    .fishing-mode {
        padding: 8px;
    }
    
    .fishing-mode .toolbar {
        padding: 8px;
        gap: 8px;
    }
    
    .fishing-mode .document-page {
        padding: 16px;
        font-size: 0.9rem;
    }
    
    /* 章节导航 */
    .chapter-nav {
        flex-direction: row;
        gap: 8px;
        padding: 12px;
    }
    
    .chapter-nav .nav-btn {
        flex: 1;
        justify-content: center;
        padding: 12px;
    }
}

/* =============================================
   5. 社区页移动端优化
   ============================================= */
@media (max-width: 768px) {
    .community-page {
        padding: 0;
    }
    
    /* 发布区域 */
    .compose-section {
        padding: 12px;
        margin: 0;
    }
    
    .compose-placeholder {
        padding: 16px;
        border-radius: 12px;
    }
    
    .compose-placeholder .avatar {
        width: 36px;
        height: 36px;
    }
    
    .compose-placeholder .hint {
        font-size: 0.9rem;
    }
    
    /* 帖子列表 */
    .posts-container {
        padding: 12px;
    }
    
    .post-card {
        padding: 12px;
        margin-bottom: 12px;
        border-radius: 12px;
    }
    
    .post-header {
        gap: 10px;
    }
    
    .post-header .avatar {
        width: 40px;
        height: 40px;
    }
    
    .post-header .username {
        font-size: 0.9rem;
    }
    
    .post-header .time {
        font-size: 0.75rem;
    }
    
    .post-content {
        font-size: 0.9rem;
        line-height: 1.6;
    }
    
    .post-images {
        grid-template-columns: repeat(3, 1fr);
        gap: 6px;
    }
    
    .post-images img {
        aspect-ratio: 1;
        border-radius: 8px;
    }
    
    /* 帖子操作栏 */
    .post-actions {
        gap: 0;
        padding-top: 12px;
    }
    
    .post-action {
        flex: 1;
        justify-content: center;
        padding: 8px;
        font-size: 0.8rem;
    }
    
    .post-action svg {
        width: 18px;
        height: 18px;
    }
    
    /* 热门话题 */
    .trending-topics {
        padding: 12px;
        margin: 0;
    }
    
    .topic-list {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .topic-item {
        padding: 8px 12px;
        font-size: 0.8rem;
        border-radius: 20px;
    }
    
    /* 评论区域 */
    .comments-section {
        padding: 12px;
    }
    
    .comment-item {
        padding: 10px 0;
    }
    
    .comment-item .avatar {
        width: 32px;
        height: 32px;
    }
    
    .comment-item .username {
        font-size: 0.85rem;
    }
    
    .comment-item .content {
        font-size: 0.85rem;
    }
    
    /* 评论输入框 */
    .comment-input {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        padding: 12px;
        background: var(--bg-primary);
        border-top: 1px solid var(--border-color);
        z-index: 100;
    }
    
    .comment-input input {
        flex: 1;
        padding: 10px 14px;
        font-size: 14px;
        border-radius: 20px;
    }
}

/* =============================================
   6. 底部导航栏（移动端专用）
   ============================================= */
@media (max-width: 768px) {
    .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: 60px;
        background: var(--bg-primary);
        border-top: 1px solid var(--border-color);
        z-index: 1000;
        padding-bottom: env(safe-area-inset-bottom, 0);
    }
    
    .mobile-bottom-nav .nav-item {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 4px;
        padding: 8px;
        color: var(--text-secondary);
        text-decoration: none;
        transition: all 0.2s;
    }
    
    .mobile-bottom-nav .nav-item.active {
        color: var(--primary-color);
    }
    
    .mobile-bottom-nav .nav-item svg {
        width: 22px;
        height: 22px;
    }
    
    .mobile-bottom-nav .nav-item span {
        font-size: 0.7rem;
    }
    
    /* 为底部导航留出空间 */
    .page-container {
        padding-bottom: calc(70px + env(safe-area-inset-bottom, 0));
    }
}

/* 桌面端隐藏底部导航 */
@media (min-width: 769px) {
    .mobile-bottom-nav {
        display: none;
    }
}

/* =============================================
   7. 触摸交互优化
   ============================================= */
@media (pointer: coarse) {
    /* 增大所有可点击元素的触摸区域 */
    .btn, 
    .nav-item,
    .post-action,
    .chapter-item,
    .book-card,
    .category-item {
        min-height: 44px;
        min-width: 44px;
    }
    
    /* 禁用hover效果（触摸设备上不需要） */
    .book-card:hover,
    .post-card:hover,
    .chapter-item:hover {
        transform: none;
    }
    
    /* 激活状态替代hover */
    .book-card:active,
    .post-card:active,
    .chapter-item:active {
        transform: scale(0.98);
        opacity: 0.9;
    }
    
    /* 滚动优化 */
    .book-scroll-container,
    .posts-container,
    .chapter-list {
        -webkit-overflow-scrolling: touch;
    }
}

/* =============================================
   8. 加载状态优化
   ============================================= */
@media (max-width: 768px) {
    .loading-overlay {
        padding: 20px;
    }
    
    .loading-spinner {
        width: 40px;
        height: 40px;
    }
    
    .loading-text {
        font-size: 0.9rem;
    }
    
    /* 骨架屏优化 */
    .skeleton {
        border-radius: 8px;
    }
    
    .skeleton-card {
        padding: 12px;
        gap: 10px;
    }
    
    .skeleton-cover {
        width: 60px;
        height: 80px;
        border-radius: 6px;
    }
}

/* =============================================
   9. 深色模式移动端适配
   ============================================= */
@media (max-width: 768px) {
    [data-theme="dark"] .navbar {
        background: rgba(26, 26, 46, 0.95);
        border-bottom-color: rgba(255, 255, 255, 0.1);
    }
    
    [data-theme="dark"] .mobile-bottom-nav {
        background: rgba(26, 26, 46, 0.95);
        border-top-color: rgba(255, 255, 255, 0.1);
    }
    
    [data-theme="dark"] .book-actions {
        background: rgba(26, 26, 46, 0.95);
        border-top-color: rgba(255, 255, 255, 0.1);
    }
    
    [data-theme="dark"] .comment-input {
        background: rgba(26, 26, 46, 0.95);
        border-top-color: rgba(255, 255, 255, 0.1);
    }
}

/* =============================================
   10. 横屏模式优化
   ============================================= */
@media (max-height: 500px) and (orientation: landscape) {
    .navbar {
        height: 48px;
    }
    
    .mobile-bottom-nav {
        height: 48px;
    }
    
    .carousel {
        aspect-ratio: 21/6;
    }
    
    .carousel-item .carousel-content {
        padding: 8px 16px;
    }
    
    .carousel-item h3 {
        font-size: 0.9rem;
    }
    
    .carousel-item p {
        display: none;
    }
}

/* =============================================
   11. 折叠屏优化
   ============================================= */
@media (min-width: 769px) and (max-width: 1024px) {
    .page-container {
        padding: 16px 24px;
    }
    
    .book-cards-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .quick-categories {
        grid-template-columns: repeat(6, 1fr);
    }
}

/* =============================================
   12. 无障碍优化
   ============================================= */
@media (max-width: 768px) {
    /* 焦点可见性 */
    *:focus {
        outline: 2px solid var(--primary-color);
        outline-offset: 2px;
    }
    
    /* 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 {
            border: 2px solid currentColor;
        }
        
        .book-card,
        .post-card {
            border: 1px solid var(--text-primary);
        }
    }
}