/* 书架页面样式 - 优化版 */

/* ==================== CSS变量扩展 ==================== */
:root {
    --header-height: 64px;
    --header-height-mobile: 56px;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --card-shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.15);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
}

/* ==================== 页面头部 ==================== */
.app-header {
    background: var(--header-bg, linear-gradient(135deg, #667eea 0%, #764ba2 100%));
    padding: 0 var(--spacing-lg);
    height: var(--header-height);
    box-shadow: 0 2px 20px rgba(102, 126, 234, 0.3);
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
}

.header-content {
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-container a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: white;
}

.app-logo {
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-sm);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.app-name {
    font-size: 1.3rem;
    font-weight: 700;
    color: white;
    letter-spacing: -0.5px;
}

.header-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* 局域网访问信息 */
.lan-access-info {
    display: flex;
    align-items: center;
    gap: 6px;
    color: rgba(255, 255, 255, 0.95);
    font-size: 0.85rem;
    background: rgba(255, 255, 255, 0.18);
    padding: 6px 12px;
    border-radius: 20px;
    backdrop-filter: blur(4px);
    font-family: 'Consolas', 'Monaco', monospace;
}

.lan-access-info .lan-icon {
    font-size: 1rem;
}

.lan-access-info #lanUrl {
    color: #fff;
    font-weight: 500;
}

.lan-access-info .copy-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 4px;
    padding: 2px 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lan-access-info .copy-btn:hover {
    background: rgba(255, 255, 255, 0.35);
    transform: scale(1.05);
}

.lan-access-info .copy-btn:active {
    transform: scale(0.95);
}

.open-source-notice {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.8rem;
    background: rgba(255, 255, 255, 0.15);
    padding: 6px 12px;
    border-radius: 20px;
    backdrop-filter: blur(4px);
}

.tutorial-link,
.github-link {
    color: white;
    text-decoration: none;
    font-size: 0.9rem;
    opacity: 0.9;
    transition: all var(--transition-fast);
    padding: 6px 12px;
    border-radius: var(--border-radius-sm);
}

.tutorial-link:hover,
.github-link:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.15);
}

.github-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    transition: transform var(--transition-fast);
}

.github-link:hover .github-icon {
    transform: scale(1.1);
}

.theme-toggle {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    width: 38px;
    height: 38px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(15deg);
}

.theme-icon {
    font-size: 1.1rem;
}

[data-theme="light"] .dark-icon,
[data-theme="dark"] .light-icon {
    display: none;
}

/* ==================== 主内容区 ==================== */
.bookshelf-main {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    min-height: calc(100vh - var(--header-height));
}

.bookshelf-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.page-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.page-title::before {
    content: '📚';
    font-size: 1.5rem;
}

.toolbar-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 10px 20px;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.btn:active {
    transform: scale(0.97);
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--hover-bg);
    border-color: var(--text-secondary);
}

.btn-danger {
    background: linear-gradient(135deg, #dc3545 0%, #c82333 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(220, 53, 69, 0.3);
}

.btn-danger:hover {
    background: linear-gradient(135deg, #e04555 0%, #d63343 100%);
    box-shadow: 0 6px 20px rgba(220, 53, 69, 0.4);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.85rem;
}

.btn-icon {
    font-size: 1.1rem;
    font-weight: 600;
}

/* ==================== 书籍网格 ==================== */
.books-container {
    min-height: 400px;
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: var(--spacing-lg);
}

/* ==================== 书籍卡片 ==================== */
.book-card {
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: all var(--transition-normal);
    cursor: pointer;
    position: relative;
}

.book-card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--border-radius-md);
    border: 2px solid transparent;
    transition: border-color var(--transition-fast);
    pointer-events: none;
}

.book-card:hover {
    transform: translateY(-6px) scale(1.02);
    box-shadow: var(--card-shadow-hover);
}

.book-card:hover::after {
    border-color: rgba(102, 126, 234, 0.5);
}

.book-card:active {
    transform: translateY(-2px) scale(1.01);
}

.book-cover {
    aspect-ratio: 3 / 4;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.book-card:hover .book-cover img {
    transform: scale(1.05);
}

/* 书籍封面悬停遮罩 */
.book-cover::before {
    content: '查看详情';
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.9rem;
    font-weight: 500;
    opacity: 0;
    transition: opacity var(--transition-fast);
    z-index: 1;
}

.book-card:hover .book-cover::before {
    opacity: 1;
}

.book-cover-placeholder {
    font-size: 3rem;
    color: rgba(255, 255, 255, 0.8);
}

.book-info {
    padding: var(--spacing-sm);
}

.book-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 6px 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.3;
}

.book-card-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ==================== 空状态 ==================== */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    text-align: center;
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 16px;
}

.empty-state h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin: 0 0 8px 0;
}

.empty-state p {
    color: var(--text-secondary);
    margin: 0 0 24px 0;
}

.empty-state-small {
    padding: 40px 20px;
    text-align: center;
    color: var(--text-secondary);
}

/* ==================== 模态框 ==================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    box-sizing: border-box;
}

.modal.active {
    display: flex;
    animation: modalFadeIn 0.25s ease;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes modalSlideUp {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.modal-content {
    position: relative;
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    width: 100%;
    max-width: 480px;
    max-height: calc(100vh - var(--spacing-xl));
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 25px 80px rgba(0, 0, 0, 0.25);
    animation: modalSlideUp 0.3s ease;
}

.modal-content.modal-large {
    max-width: 800px;
}

.modal-content.modal-small {
    max-width: 400px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    background: var(--card-bg);
    position: sticky;
    top: 0;
    z-index: 1;
}

.modal-header h2 {
    margin: 0;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    background: var(--hover-bg);
    border: none;
    font-size: 1.3rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    line-height: 1;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    color: var(--text-primary);
    background: var(--border-color);
}

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    flex: 1;
    -webkit-overflow-scrolling: touch;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    background: var(--card-bg);
    position: sticky;
    bottom: 0;
}

/* ==================== 表单样式 ==================== */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-group label .required {
    color: #dc3545;
}

.form-group input[type="text"] {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    background: var(--input-bg);
    color: var(--text-primary);
    transition: border-color 0.2s;
}

.form-group input[type="text"]:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-hint {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 8px;
}

/* ==================== 封面上传 ==================== */
.cover-upload-area {
    cursor: pointer;
}

.cover-preview {
    aspect-ratio: 3 / 4;
    max-width: 200px;
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--hover-bg);
    transition: border-color 0.2s;
}

.cover-preview:hover {
    border-color: #667eea;
}

.cover-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.cover-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.upload-icon {
    font-size: 2rem;
}

/* ==================== 书籍详情 ==================== */
.book-detail-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.book-info-section {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.book-cover-large {
    width: 140px;
    flex-shrink: 0;
    aspect-ratio: 3 / 4;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.book-cover-large img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-meta {
    flex: 1;
    min-width: 0;
}

.book-meta h3 {
    font-size: 1.3rem;
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.3;
    word-break: break-word;
}

.meta-item {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: var(--spacing-xs) 0;
    display: flex;
    gap: 4px;
}

.meta-item span:first-child {
    color: var(--text-primary);
    font-weight: 500;
    flex-shrink: 0;
}

.book-actions {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

/* ==================== 章节列表 ==================== */
.chapters-section {
    border-top: 1px solid var(--border-color);
    padding-top: var(--spacing-md);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.section-header h3 {
    font-size: 1.05rem;
    margin: 0;
    color: var(--text-primary);
    font-weight: 600;
}

.chapters-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    max-height: 280px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding-right: 4px;
}

/* 自定义滚动条 */
.chapters-list::-webkit-scrollbar {
    width: 6px;
}

.chapters-list::-webkit-scrollbar-track {
    background: var(--hover-bg);
    border-radius: 3px;
}

.chapters-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.chapters-list::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

.chapter-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--hover-bg);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
    gap: var(--spacing-sm);
}

.chapter-item:hover {
    background: var(--border-color);
}

.chapter-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
    min-width: 0;
}

.chapter-order {
    font-size: 0.8rem;
    color: var(--text-secondary);
    min-width: 32px;
    flex-shrink: 0;
}

.chapter-title {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chapter-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.chapter-actions {
    display: flex;
    gap: 6px;
    opacity: 1;
    flex-shrink: 0;
}

.chapter-action-btn {
    background: none;
    border: none;
    padding: 6px 10px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s;
}

.chapter-action-btn:hover {
    background: var(--card-bg);
    color: var(--text-primary);
}

.chapter-action-btn.danger:hover {
    color: #dc3545;
}

.chapter-enter-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white !important;
    font-weight: 500;
}

.chapter-enter-btn:hover {
    background: linear-gradient(135deg, #7b8eef 0%, #8a5cb5 100%) !important;
    color: white !important;
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.chapter-read-btn {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: white !important;
    font-weight: 500;
}

.chapter-read-btn:hover:not(:disabled) {
    background: linear-gradient(135deg, #34ce57 0%, #38d9a9 100%) !important;
    color: white !important;
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(40, 167, 69, 0.4);
}

.chapter-read-btn:disabled {
    background: var(--border-color);
    color: var(--text-secondary) !important;
    cursor: not-allowed;
    opacity: 0.6;
}

/* ==================== Toast 通知 ==================== */
.toast {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: rgba(0, 0, 0, 0.75);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 0.95rem;
    opacity: 0;
    transition: all 0.3s;
    z-index: 99999; /* 最高层级，确保在编辑模式等所有元素之上 */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    background: rgba(82, 196, 26, 0.85);
    color: white;
}

.toast.error {
    background: rgba(255, 77, 79, 0.85);
    color: white;
}

.toast.info {
    background: rgba(24, 144, 255, 0.85);
    color: white;
}

.toast.warning {
    background: rgba(250, 173, 20, 0.85);
    color: white;
}

/* ==================== 响应式设计 ==================== */

/* 平板设备 */
@media (max-width: 1024px) {
    .books-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: var(--spacing-md);
    }

    .modal-content.modal-large {
        max-width: 90%;
    }
}

/* 手机设备 - 横屏 */
@media (max-width: 768px) {
    :root {
        --header-height: var(--header-height-mobile);
    }

    .app-header {
        padding: 0 var(--spacing-md);
    }

    .app-name {
        font-size: 1.1rem;
    }

    .app-logo {
        width: 36px;
        height: 36px;
    }

    .header-links {
        gap: var(--spacing-xs);
    }

    .header-links .lan-access-info {
        display: none;
    }

    .header-links .open-source-notice {
        display: none;
    }

    .header-links .tutorial-link {
        display: none;
    }

    .bookshelf-main {
        padding: var(--spacing-md);
    }

    .bookshelf-toolbar {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: stretch;
    }

    .toolbar-actions {
        justify-content: stretch;
    }

    .toolbar-actions .btn {
        flex: 1;
        justify-content: center;
    }

    .page-title {
        font-size: 1.4rem;
    }

    .page-title::before {
        font-size: 1.2rem;
    }

    .books-grid {
        grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
        gap: var(--spacing-sm);
    }

    /* 移动端模态框全屏显示 */
    .modal {
        padding: 0;
    }

    .modal-content {
        width: 100%;
        max-width: 100%;
        height: 100%;
        max-height: 100%;
        border-radius: 0;
        animation: modalSlideUp 0.3s ease;
    }

    .modal-content.modal-large,
    .modal-content.modal-small {
        max-width: 100%;
    }

    .modal-header {
        padding: var(--spacing-md);
    }

    .modal-body {
        padding: var(--spacing-md);
    }

    .modal-footer {
        padding: var(--spacing-md);
    }

    .book-info-section {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .book-cover-large {
        width: 120px;
    }

    .book-meta h3 {
        font-size: 1.15rem;
    }

    .book-actions {
        justify-content: center;
    }

    .meta-item {
        justify-content: center;
    }

    .section-header {
        flex-direction: column;
        align-items: stretch;
    }

    .section-header .btn {
        width: 100%;
        justify-content: center;
    }

    .chapters-list {
        max-height: 250px;
    }

    .chapter-item {
        flex-wrap: wrap;
        padding: var(--spacing-sm);
    }

    .chapter-info {
        width: 100%;
        margin-bottom: var(--spacing-xs);
    }

    .chapter-actions {
        width: 100%;
        justify-content: flex-end;
    }

    /* 移动端书籍卡片封面提示不显示 */
    .book-cover::before {
        display: none;
    }
}

/* 手机设备 - 竖屏小屏 */
@media (max-width: 480px) {
    .books-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }

    .book-info {
        padding: var(--spacing-xs);
    }

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

    .btn {
        padding: 8px 16px;
        font-size: 0.9rem;
    }

    .btn-sm {
        padding: 6px 12px;
        font-size: 0.8rem;
    }

    .chapter-action-btn {
        padding: 8px 12px;
        font-size: 0.75rem;
    }

    .empty-state {
        padding: 60px var(--spacing-md);
    }

    .empty-icon {
        font-size: 3rem;
    }

    .empty-state h2 {
        font-size: 1.2rem;
    }

    .toast {
        left: var(--spacing-md);
        right: var(--spacing-md);
        transform: translateY(100px);
        width: auto;
    }

    .toast.show {
        transform: translateY(0);
    }
}

/* 超小屏幕 */
@media (max-width: 360px) {
    .books-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xs);
    }

    .toolbar-actions {
        flex-direction: column;
    }

    .book-cover-large {
        width: 100px;
    }
}

/* ==================== 暗色主题 ==================== */
[data-theme="dark"] {
    --card-bg: #1e1e2e;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --border-color: #3a3a4a;
    --hover-bg: #2a2a3a;
    --input-bg: #2a2a3a;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    --card-shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.3);
}

[data-theme="light"] {
    --card-bg: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #666680;
    --border-color: #e0e0e8;
    --hover-bg: #f5f5f8;
    --input-bg: #ffffff;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --card-shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.15);
}

body {
    background: var(--hover-bg);
    color: var(--text-primary);
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .book-card:hover {
        transform: none;
        box-shadow: var(--card-shadow);
    }

    .book-card:active {
        transform: scale(0.98);
    }

    .btn:hover {
        transform: none;
    }

    .chapter-actions {
        opacity: 1;
    }
}

/* iOS 安全区域适配 */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .modal-footer {
        padding-bottom: calc(var(--spacing-md) + env(safe-area-inset-bottom));
    }

    .toast {
        bottom: calc(24px + env(safe-area-inset-bottom));
    }
}

/* ==================== 搜索和筛选栏 ==================== */
.filter-bar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    box-shadow: var(--card-shadow);
}

.search-box {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    position: relative;
}

.search-box input {
    flex: 1;
    padding: 10px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 0.95rem;
    background: var(--input-bg);
    color: var(--text-primary);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.search-box input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.search-btn, .clear-search-btn {
    padding: 10px 14px;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 1rem;
}

.search-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.search-btn:hover {
    transform: scale(1.05);
}

.clear-search-btn {
    background: var(--hover-bg);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.clear-search-btn:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.tag-filter {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.filter-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.tag-chips {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    flex: 1;
}

.tag-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
    background: var(--hover-bg);
    color: var(--text-primary);
    border: 2px solid transparent;
}

.tag-chip:hover {
    background: var(--tag-color, #667eea);
    color: white;
}

.tag-chip.active {
    background: var(--tag-color, #667eea);
    color: white;
    border-color: var(--tag-color, #667eea);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.tag-count {
    background: rgba(255, 255, 255, 0.3);
    padding: 1px 6px;
    border-radius: 10px;
    font-size: 0.7rem;
}

.no-tags {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-style: italic;
}

/* ==================== 批量操作栏 ==================== */
.batch-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-lg);
    color: white;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.batch-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.95rem;
}

.batch-info input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.batch-actions {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

/* ==================== 书籍卡片扩展 ==================== */
.book-card.batch-mode {
    cursor: pointer;
}

.book-card.selected {
    outline: 3px solid #667eea;
    outline-offset: -3px;
}

.book-card.selected::after {
    border-color: #667eea;
}

.book-checkbox {
    position: absolute;
    top: 8px;
    left: 8px;
    z-index: 10;
    background: white;
    border-radius: 4px;
    padding: 2px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.book-checkbox input {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.book-tags {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
    margin-top: 6px;
}

.book-tag {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.7rem;
    color: white;
    white-space: nowrap;
    max-width: 60px;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ==================== 标签输入 ==================== */
.tag-input-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.selected-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    min-height: 32px;
}

.selected-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.85rem;
    color: white;
}

.remove-tag {
    cursor: pointer;
    font-weight: bold;
    opacity: 0.8;
    transition: opacity 0.2s;
}

.remove-tag:hover {
    opacity: 1;
}

.tag-dropdown {
    position: relative;
}

.tag-dropdown input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
    background: var(--input-bg);
    color: var(--text-primary);
}

.tag-dropdown input:focus {
    outline: none;
    border-color: #667eea;
}

.tag-suggestions {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    max-height: 200px;
    overflow-y: auto;
    z-index: 100;
    margin-top: 4px;
}

.tag-suggestion {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 10px 14px;
    cursor: pointer;
    transition: background 0.2s;
}

.tag-suggestion:hover {
    background: var(--hover-bg);
}

.tag-suggestion .tag-color {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}

.tag-suggestion.new-tag {
    border-top: 1px solid var(--border-color);
    color: #667eea;
    font-weight: 500;
}

.tag-suggestion .tag-icon {
    font-size: 1.1rem;
}

/* ==================== 标签管理 ==================== */
.tag-manage-form {
    margin-bottom: var(--spacing-lg);
}

.form-row {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.form-row input[type="text"] {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
    background: var(--input-bg);
    color: var(--text-primary);
}

.form-row input[type="color"] {
    width: 44px;
    height: 44px;
    padding: 2px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    background: var(--input-bg);
}

.tag-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    max-height: 300px;
    overflow-y: auto;
}

.tag-manage-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--hover-bg);
    border-radius: var(--border-radius-sm);
}

.tag-color-dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    flex-shrink: 0;
}

.tag-manage-item .tag-name {
    flex: 1;
    font-weight: 500;
    color: var(--text-primary);
}

.tag-manage-item .tag-book-count {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.tag-edit-btn, .tag-delete-btn {
    padding: 4px 10px;
    border: none;
    border-radius: 4px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
}

.tag-edit-btn {
    background: var(--card-bg);
    color: var(--text-primary);
}

.tag-edit-btn:hover {
    background: var(--border-color);
}

.tag-delete-btn {
    background: transparent;
    color: #dc3545;
}

.tag-delete-btn:hover {
    background: rgba(220, 53, 69, 0.1);
}

.no-tags-message {
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-lg);
    font-style: italic;
}

/* ==================== 批量标签选择 ==================== */
.batch-tag-select {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    max-height: 250px;
    overflow-y: auto;
    margin-top: var(--spacing-md);
}

.batch-tag-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--hover-bg);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: background 0.2s;
}

.batch-tag-option:hover {
    background: var(--border-color);
}

.batch-tag-option input {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* ==================== 章节拖拽排序 ==================== */
.chapter-drag-handle {
    cursor: grab;
    padding: 4px 8px;
    color: var(--text-secondary);
    font-size: 1.2rem;
    user-select: none;
    transition: color 0.2s;
}

.chapter-drag-handle:hover {
    color: var(--text-primary);
}

.chapter-item.dragging {
    opacity: 0.5;
    background: var(--border-color);
}

.chapter-item.drag-over {
    border-top: 2px solid #667eea;
}

.chapter-item[draggable="true"] {
    cursor: default;
}

.chapter-item[draggable="true"]:active {
    cursor: grabbing;
}

/* ==================== 书籍详情标签区域 ==================== */
.detail-tags-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    margin: var(--spacing-sm) 0;
}

.meta-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.detail-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    flex: 1;
}

.detail-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.8rem;
    color: white;
}

.remove-detail-tag {
    cursor: pointer;
    font-weight: bold;
    opacity: 0.7;
    transition: opacity 0.2s;
    margin-left: 2px;
}

.remove-detail-tag:hover {
    opacity: 1;
}

.btn-add-tag {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    border: 2px dashed var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-add-tag:hover {
    border-color: #667eea;
    color: #667eea;
    background: rgba(102, 126, 234, 0.1);
}

.no-tags-hint {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-style: italic;
}

/* ==================== 快速添加标签模态框 ==================== */
.quick-tag-input {
    margin-bottom: var(--spacing-md);
}

.quick-tag-input input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 0.95rem;
    background: var(--input-bg);
    color: var(--text-primary);
}

.quick-tag-input input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.quick-tag-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-height: 280px;
    overflow-y: auto;
}

.quick-tag-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 10px 14px;
    background: var(--hover-bg);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all 0.2s;
}

.quick-tag-item:hover {
    background: var(--border-color);
}

.quick-tag-item .tag-add-icon {
    margin-left: auto;
    color: #667eea;
    font-weight: bold;
    opacity: 0;
    transition: opacity 0.2s;
}

.quick-tag-item:hover .tag-add-icon {
    opacity: 1;
}

.quick-tag-item.new-tag {
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
    font-weight: 500;
}

.quick-tag-item.new-tag:hover {
    background: rgba(102, 126, 234, 0.2);
}

.quick-tag-item .tag-icon {
    font-size: 1.1rem;
}

/* ==================== 响应式补充 ==================== */
@media (max-width: 768px) {
    .filter-bar {
        padding: var(--spacing-sm);
    }
    
    .search-box {
        flex-wrap: wrap;
    }
    
    .search-box input {
        width: 100%;
    }
    
    .tag-filter {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .batch-toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .batch-actions {
        justify-content: center;
    }
    
    .form-row {
        flex-wrap: wrap;
    }
    
    .form-row input[type="text"] {
        flex: 1 1 100%;
    }
    
    .detail-tags-section {
        flex-direction: column;
        align-items: flex-start;
    }
}