* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4a6cf7;
    --primary-hover: #3951c6;
    --secondary-color: #6c757d;
    --secondary-hover: #8e44ad;
    --success-color: #28a745;
    --success-hover: #27ae60;
    --danger-color: #e64c5c;
    --danger-hover: #c0392b;
    --warning-color: #ffcd39;
    --info-color: #17a2b8;
    --text-color: #333;
    --text-secondary: #7f8c8d;
    --bg-color: #fff;
    --card-bg: #fff;
    --border-color: #e9ecef;
    --input-bg: #fff;
    --input-border: #ced4da;
    --table-header-bg: #f8f9fa;
    --table-border: #dee2e6;
    --table-row-hover: #f8f9fa;
    --table-row-selected: #e8f0fe;
    --modal-bg: #fff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0, 0, 0, 0.08);
}

/* 夜间模式颜色变量 */
.dark-mode {
    --primary-color: #6d8fff;
    --primary-hover: #5273ff;
    --secondary-color: #a5b0bd;
    --success-color: #4bd269;
    --danger-color: #ff5b69;
    --warning-color: #ffd54f;
    --info-color: #42c9df;
    --text-color: #ffffff;
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --border-color: #333333;
    --input-bg: #2a2a2a;
    --input-border: #444444;
    --table-header-bg: #252525;
    --table-border: #333333;
    --table-row-hover: #2c2c2c;
    --table-row-selected: #363f54;
    --modal-bg: #1e1e1e;
    --shadow-color: rgba(0, 0, 0, 0.5);
}

/* 添加夜间模式下的通用元素样式 */
.dark-mode body {
    background-color: var(--bg-color);
    color: var(--text-color);
}

.dark-mode h1, 
.dark-mode h2, 
.dark-mode h3 {
    color: #ffffff;
}

.dark-mode .card, 
.dark-mode .word-card, 
.dark-mode .form-card, 
.dark-mode .alphabet-container,
.dark-mode .word-details-popup,
.dark-mode .word-details-content {
    background-color: var(--card-bg);
    border-color: var(--border-color);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
}

.dark-mode #definition-container,
.dark-mode #definition-content,
.dark-mode .definition-item {
    background-color: #252525;
    color: #ffffff;
    border-color: #444444;
}

.dark-mode .word-definition-item {
    background-color: #252525;
    border-left-color: var(--primary-color);
}

.dark-mode .definition-example {
    color: #8ecdff;
}

.dark-mode .definition-note {
    color: #7bdb8e;
}

.dark-mode .definition-part-of-speech {
    color: #ff8f9d;
}

.dark-mode input, 
.dark-mode select, 
.dark-mode textarea {
    background-color: var(--input-bg);
    border-color: var(--input-border);
    color: var(--text-color);
}

.dark-mode .word-table {
    background-color: var(--card-bg);
    color: var(--text-color);
}

.dark-mode .word-table th {
    background-color: var(--table-header-bg);
    color: #ffffff;
    border-color: #444444;
}

.dark-mode .word-table td {
    border-color: var(--table-border);
    background-color: #232323;
}

.dark-mode .word-row:hover td {
    background-color: var(--table-row-hover);
}

.dark-mode .word-row.selected td {
    background-color: var(--table-row-selected);
}

.dark-mode .search-input {
    background-color: var(--input-bg);
    color: #ffffff;
}

.dark-mode .search-icon {
    color: #aaaaaa;
}

.dark-mode .action-btn {
    background-color: #333333;
    color: #ffffff;
}

.dark-mode .action-btn:hover {
    background-color: #444444;
}

.dark-mode .export-btn, 
.dark-mode .add-btn {
    background-color: var(--primary-color);
}

.dark-mode .export-btn:hover, 
.dark-mode .add-btn:hover {
    background-color: var(--primary-hover);
}

.dark-mode .back-btn {
    background-color: #333333;
    color: #ffffff;
}

.dark-mode .back-btn:hover {
    background-color: #444444;
}

.dark-mode .back-to-top-btn,
.dark-mode .word-nav-btn,
.dark-mode .action-icon-btn {
    background-color: #333333;
    color: #ffffff;
}

.dark-mode .back-to-top-btn:hover,
.dark-mode .word-nav-btn:hover,
.dark-mode .action-icon-btn:hover {
    background-color: #444444;
}

.dark-mode .word-actions-fixed {
    background-color: #1a1a1a;
    border-color: #444444;
}

.dark-mode .table-btn {
    background-color: #333333;
    color: #ffffff;
}

.dark-mode .table-btn:hover {
    background-color: #444444;
}

.dark-mode .word-details-header {
    border-color: #444444;
}

.dark-mode .encouragement {
    color: #a0b4d0;
}

.dark-mode .prev-word-info {
    color: #a0b4d0;
}

.dark-mode #prevWordText {
    color: #8ecdff;
}

.dark-mode .close-details-btn:hover {
    background-color: #333333;
}

/* 主题切换按钮样式 */
.theme-toggle-btn {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--card-bg);
    box-shadow: 0 2px 8px var(--shadow-color);
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.theme-toggle-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px var(--shadow-color);
}

.theme-toggle-btn svg {
    width: 20px;
    height: 20px;
    stroke: var(--text-color);
}

@media (max-width: 768px) {
    .theme-toggle-btn {
        width: 36px;
        height: 36px;
        top: 15px;
        left: 15px;
    }
    
    .theme-toggle-btn svg {
        width: 18px;
        height: 18px;
    }
}

body {
    font-family: 'Noto Sans SC', 'Microsoft YaHei', Arial, sans-serif;
    background-color: var(--light-bg);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 30px auto;
    padding: 20px;
    position: relative;
}

h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #2c3e50;
    font-weight: 500;
    letter-spacing: 0.5px;
}

.word-card {
    background-color: white;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    padding: 30px;
    margin-bottom: 20px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.word-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.08), 0 3px 6px rgba(0, 0, 0, 0.1);
}

#current-word {
    font-size: 48px;
    text-align: center;
    margin-bottom: 30px;
    font-weight: bold;
    color: var(--primary-color);
    letter-spacing: 1px;
    transition: all 0.3s ease;
}

#definition-container {
    background-color: #f8f9fa;
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 25px;
    border-left: 4px solid var(--primary-color);
    animation: slideUp 0.3s ease-out;
}

#definition-content {
    font-size: 16px;
}

.definition-item {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #eee;
    transition: transform 0.2s;
}

.definition-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.definition-item:hover {
    transform: translateX(5px);
}

.part-of-speech {
    display: inline-block;
    font-weight: bold;
    color: var(--danger-color);
    margin-right: 10px;
}

.meaning, .example, .note {
    margin-top: 8px;
    padding-left: 15px;
}

.example {
    color: var(--primary-color);
    font-style: italic;
}

.note {
    color: var(--success-color);
}

.button-group {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.btn:active {
    transform: translateY(0);
}

.btn svg {
    margin-right: 4px;
}

.btn.primary {
    background-color: var(--primary-color);
    color: white;
}

.btn.primary:hover {
    background-color: var(--primary-hover);
}

#show-definition {
    background-color: #f1c40f;
    color: #333;
}

#show-definition:hover {
    background-color: #f39c12;
}

.hidden {
    display: none !important;
}

/* 右上角按钮 */
.word-list-btn {
    position: absolute;
    top: 10px;
    right: 20px;
    background-color: var(--success-color);
    color: white;
    padding: 8px 15px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}

.word-list-btn:hover {
    background-color: var(--success-hover);
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

/* 单词列表页面样式 */
.header-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    flex-wrap: wrap;
}

.header-section h1 {
    margin-bottom: 0;
}

.search-section {
    display: flex;
    align-items: center;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
    width: 250px;
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    z-index: 2;
    pointer-events: none;
}

.input-container {
    position: relative;
    width: 100%;
}

.search-input {
    padding: 10px 35px 10px 35px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    width: 100%;
    transition: all 0.2s;
    box-sizing: border-box;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 108, 247, 0.1);
}

.clear-search-btn {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: #999;
    padding: 4px;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color 0.2s, color 0.2s;
    z-index: 3;
}

.clear-search-btn:hover {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--danger-color);
}

.clear-search-btn svg {
    width: 16px;
    height: 16px;
}

.table-container {
    background-color: white;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    overflow: hidden;
    margin-bottom: 30px;
}

.word-table {
    width: 100%;
    border-collapse: collapse;
    background-color: white;
    table-layout: fixed;
}

.word-table th, .word-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    height: 50px;
    box-sizing: border-box;
    vertical-align: middle;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 设置列宽比例 */
.word-table th:nth-child(1), 
.word-table td:nth-child(1) {
    width: 15%;
}

.word-table th:nth-child(2), 
.word-table td:nth-child(2) {
    width: 10%;
}

.word-table th:nth-child(3), 
.word-table td:nth-child(3) {
    width: 25%;
}

.word-table th:nth-child(4), 
.word-table td:nth-child(4) {
    width: 25%;
}

.word-table th:nth-child(5), 
.word-table td:nth-child(5) {
    width: 25%;
}

.word-table th {
    background-color: var(--primary-color);
    color: white;
    font-weight: 500;
    position: sticky;
    top: 0;
    z-index: 10;
}

.word-cell {
    font-weight: 500;
    color: var(--primary-color);
}

.word-row:hover {
    background-color: #f5f5f5;
}

.word-row.selected td {
    background-color: #e3f2fd;
}

.word-row.selected .word-cell {
    border-left: 3px solid var(--primary-color);
    padding-left: 12px;
}

.word-cell.marked {
    position: relative;
    color: var(--primary-color);
    font-weight: 600;
    background: linear-gradient(to right, rgba(231, 76, 60, 0.05), transparent);
    border-left: 3px solid var(--danger-color);
    padding-left: 12px;
    transition: all 0.2s ease;
}

.mark-indicator {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--danger-color);
    margin-right: 6px;
    position: relative;
    top: 1px;
    opacity: 0.85;
    transition: all 0.2s;
}

.word-row:hover .mark-indicator {
    opacity: 1;
    transform: scale(1.1);
}

/* 悬停和选中状态的标记单词 */
.word-row:hover .word-cell.marked {
    background: linear-gradient(to right, rgba(231, 76, 60, 0.08), rgba(231, 76, 60, 0.01));
}

.word-row.selected .word-cell.marked {
    background: linear-gradient(to right, rgba(231, 76, 60, 0.1), #e3f2fd);
    border-left: 3px solid var(--danger-color);
}

.action-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.action-buttons-right {
    display: flex;
    gap: 10px;
}

.action-btn, .back-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 15px;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.2s;
    font-weight: 500;
}

.toggle-btn {
    background-color: #f39c12;
    color: white;
    border: none;
    cursor: pointer;
    font-size: 14px;
}

.toggle-btn:hover {
    background-color: #e67e22;
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.export-btn {
    background-color: #3498db;
    color: white;
}

.export-btn:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.back-btn {
    background-color: var(--primary-color);
    color: white;
}

.back-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.add-btn {
    background-color: var(--success-color);
    color: white;
}

.add-btn:hover {
    background-color: var(--success-hover);
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.action-cell {
    white-space: nowrap;
}

.table-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    margin: 2px;
    border-radius: 6px;
    text-decoration: none;
    font-size: 14px;
    color: white;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

.edit-btn {
    background-color: var(--primary-color);
}

.edit-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.add-def-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 8px 12px;
    margin: 2px;
    border-radius: 6px;
    text-decoration: none;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.add-def-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.add-def-btn svg {
    width: 16px;
    height: 16px;
    stroke: white;
}

/* 不应用伪元素到add-def-btn */
.add-def-btn::before,
.add-def-btn::after {
    content: none;
}

.mark-btn {
    background-color: #f39c12;
    color: white;
}

.mark-btn:hover {
    background-color: #e67e22;
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.mark-btn.marked {
    background-color: #e74c3c;
}

.mark-btn.marked svg {
    fill: white;
}

.delete-btn {
    background-color: var(--danger-color);
}

.delete-btn:hover {
    background-color: var(--danger-hover);
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.delete-form {
    display: inline;
}

/* 固定在顶部的操作区 */
.word-actions-fixed {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 0;
    transform: translateY(-100%);
    transition: transform 0.3s ease-in-out;
}

.word-actions-fixed:not(.hidden) {
    transform: translateY(0);
}

.word-actions-content {
    max-width: 1000px;
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.selected-word-text {
    font-weight: 500;
    color: var(--primary-color);
    font-size: 16px;
}

.action-buttons {
    display: flex;
    gap: 10px;
}

/* 表单样式 */
.form-card {
    background-color: white;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    padding: 25px;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 15px;
}

.form-label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: #2c3e50;
}

.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    transition: all 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(74, 108, 247, 0.2);
}

textarea.form-control {
    min-height: 80px;
    resize: vertical;
}

.form-text {
    color: var(--text-secondary);
    font-size: 12px;
    margin-top: 3px;
    display: block;
}

.definition-form {
    background-color: #f8f9fa;
    border-radius: 8px;
    padding: 18px;
    margin-bottom: 20px;
    border-left: 3px solid var(--primary-color);
}

.definition-form h3 {
    margin-bottom: 12px;
    color: var(--primary-color);
    font-weight: 500;
    font-size: 16px;
}

.add-definition-btn {
    margin-bottom: 18px;
    background-color: var(--primary-color);
    color: white;
    padding: 0;
    font-size: 14px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.add-definition-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.12);
}

.add-definition-btn::before,
.add-definition-btn::after {
    content: '';
    position: absolute;
    background-color: white;
}

.add-definition-btn::before {
    width: 16px;
    height: 2px;
    border-radius: 1px;
}

.add-definition-btn::after {
    width: 2px;
    height: 16px;
    border-radius: 1px;
}

/* 隐藏SVG图标 */
.add-definition-btn svg {
    display: none;
}

.remove-definition-btn {
    background-color: var(--danger-color);
    color: white;
    margin-top: 8px;
    padding: 6px 12px;
    font-size: 13px;
}

.remove-definition-btn:hover {
    background-color: var(--danger-hover);
}

.submit-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 12px 24px;
    font-size: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.submit-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.12);
}

.continue-btn {
    background-color: var(--success-color);
}

.continue-btn:hover {
    background-color: var(--success-hover);
}

.form-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-start;
    margin-top: 24px;
}

/* 按钮行动区样式 */
.form-actions .btn {
    min-width: 150px;
    padding: 12px 24px;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border-radius: 10px;
    transition: all 0.3s ease;
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.1);
}

.button-actions {
    display: flex;
    justify-content: flex-start;
    margin: 20px 0 10px;
}

.button-actions .btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.06);
}

/* 紧凑布局样式 */
.compact-layout h1 {
    margin-bottom: 15px;
    font-size: 24px;
}

.compact-layout .container {
    max-width: 900px;
    margin: 20px auto;
    padding: 15px;
}

.compact-layout .back-btn {
    margin-bottom: 15px;
    display: inline-block;
}

/* 两列表单布局 */
.two-col-form {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.two-col-form .form-group {
    flex: 1 1 calc(50% - 15px);
    min-width: 250px;
}

.two-col-form .form-group.full-width {
    flex: 1 1 100%;
}

/* 自适应布局 */
@media (max-width: 768px) {
    .two-col-form .form-group {
        flex: 1 1 100%;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes pulse {
    0% { opacity: 0.6; }
    50% { opacity: 1; }
    100% { opacity: 0.6; }
}

.loading {
    animation: pulse 1.5s infinite;
}

.word-appear {
    animation: fadeIn 0.5s ease-out;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .word-table th, .word-table td {
        padding: 10px;
    }
    
    .search-input {
        width: 180px;
    }
    
    .header-section {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .search-section {
        width: 100%;
    }
    
    .search-input {
        width: 100%;
    }
    
    .word-actions-content {
        flex-direction: column;
        gap: 10px;
    }
    
    .action-buttons-right {
        margin-top: 10px;
        flex-wrap: wrap;
        justify-content: flex-end;
    }
    
    .action-bar {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .toggle-btn, .export-btn, .add-btn {
        font-size: 13px;
        padding: 8px 10px;
    }
}

/* 特效与状态 */
.btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

/* 单词显示区域 */
.word-display {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 30px;
}

.word-actions {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    gap: 10px;
}

.action-icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 5px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.action-icon-btn:hover {
    color: var(--primary-color);
    background-color: rgba(74, 108, 247, 0.1);
}

.action-icon-btn.marked {
    color: var(--danger-color);
}

.action-icon-btn.marked svg {
    fill: var(--danger-color);
}

/* 词性和释义区域布局 */
.definition-header {
    margin-bottom: 8px;
}

/* 标记的单词在列表中的样式 */
.word-cell.marked {
    position: relative;
    color: var(--primary-color);
    background: linear-gradient(to right, rgba(231, 76, 60, 0.08), transparent);
    border-left: 3px solid var(--danger-color);
    font-weight: 600;
    transition: all 0.2s ease;
}

.word-cell.marked::after {
    content: "";
    position: absolute;
    top: 12px;
    right: 10px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--danger-color);
    opacity: 0.8;
}

/* 当整行悬停时标记效果增强 */
.word-row:hover .word-cell.marked {
    background: linear-gradient(to right, rgba(231, 76, 60, 0.12), rgba(231, 76, 60, 0.05));
}

/* 简单视图表格样式 */
.word-table.simple-view {
    width: 100%;
    table-layout: fixed;
}

.word-table.simple-view th {
    background-color: var(--primary-color);
    color: white;
    font-weight: 500;
    padding: 15px 20px;
}

.word-table.simple-view .word-cell {
    font-size: 20px;
    padding: 20px;
    transition: all 0.2s;
    width: 100%;
    text-align: center;
}

.word-table.simple-view tr:hover .word-cell {
    background-color: #f8f9fa;
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.word-table.simple-view tr.selected .word-cell {
    background-color: #e3f2fd;
    border-left: 3px solid var(--primary-color);
}

.word-table.simple-view .word-cell.marked {
    color: var(--primary-color);
    background: linear-gradient(to right, rgba(231, 76, 60, 0.08), transparent);
    border-left: 3px solid var(--danger-color);
    font-weight: 600;
    text-align: center;
}

.action-btn.toggle-btn.active {
    background-color: var(--primary-color);
    color: white;
}

.action-btn.toggle-btn.active:hover {
    background-color: var(--primary-hover);
}

.no-marked-hint {
    text-align: center;
    color: var(--danger-color);
    font-size: 0.9rem;
    margin-top: 10px;
    padding: 8px;
    border-radius: 6px;
    background-color: rgba(231, 76, 60, 0.1);
}

.input-with-button {
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

.input-with-button .form-control {
    flex: 1;
}

.generate-example-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 8px 16px;
    font-size: 14px;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 6px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.generate-example-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.12);
}

.generate-example-btn:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.loading-spinner {
    animation: spin 1s linear infinite;
    display: inline-block;
    vertical-align: middle;
    margin-right: 5px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.generate-note-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 8px 16px;
    font-size: 14px;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 6px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.generate-note-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.12);
}

.generate-note-btn:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* 自动保存提示 */
.auto-save-indicator {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 8px 16px;
    border-radius: 4px;
    font-size: 14px;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1000;
}

.auto-save-indicator.show {
    opacity: 1;
}

/* 键盘快捷键提示 */
.keyboard-shortcut {
    color: #666;
    font-size: 12px;
    margin-left: 8px;
}

/* 禁用状态样式 */
.submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* 表单验证提示 */
.form-error {
    color: #dc3545;
    font-size: 12px;
    margin-top: 4px;
    display: none;
}

.form-error.show {
    display: block;
}

/* 输入框验证状态 */
input:invalid,
textarea:invalid {
    border-color: #dc3545;
}

input:valid,
textarea:valid {
    border-color: #28a745;
}

/* 自动保存状态指示器 */
.auto-save-status {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 8px 16px;
    border-radius: 4px;
    font-size: 14px;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1000;
}

.auto-save-status.show {
    opacity: 1;
}

/* 工具提示 */
[data-tooltip] {
    position: relative;
}

[data-tooltip]:before {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 5px 10px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    border-radius: 4px;
    font-size: 12px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

[data-tooltip]:hover:before {
    opacity: 1;
    visibility: visible;
}

/* 响应式优化 */
@media (max-width: 768px) {
    .auto-save-status {
        bottom: 10px;
        right: 10px;
        font-size: 12px;
        padding: 6px 12px;
    }
    
    [data-tooltip]:before {
        display: none;
    }
}

/* 夜间模式下表单元素的优化 */
.dark-mode .form-control,
.dark-mode input[type="text"],
.dark-mode input[type="email"],
.dark-mode input[type="password"],
.dark-mode input[type="number"],
.dark-mode input[type="search"],
.dark-mode textarea,
.dark-mode select {
    background-color: #2a2a2a !important;
    color: #ffffff !important;
    border-color: #444444 !important;
}

.dark-mode .form-control:focus,
.dark-mode input:focus,
.dark-mode textarea:focus,
.dark-mode select:focus {
    background-color: #333333 !important;
    border-color: var(--primary-color) !important;
    box-shadow: 0 0 0 3px rgba(109, 143, 255, 0.25) !important;
}

/* 夜间模式下表单标签的优化 */
.dark-mode .form-label,
.dark-mode label {
    color: #000000 !important;
}

/* 夜间模式下表单提示文字的优化 */
.dark-mode .form-text,
.dark-mode small {
    color: #b0b0b0 !important;
}

/* 夜间模式下词义标题的优化 */
.dark-mode .definition-form h3 {
    color: #000000;
    border-bottom-color: #444444;
}

/* 修复edit_word和add_word界面中的"单词"标签颜色 */
.dark-mode label[for="word"] {
    color: #ffffff !important;
    font-weight: 500;
}

/* 优化夜间模式下的按钮状态 */
.dark-mode .btn.primary, 
.dark-mode #next-word,
.dark-mode #show-definition,
.dark-mode .submit-btn,
.dark-mode .generate-example-btn,
.dark-mode .generate-note-btn,
.dark-mode .add-definition-btn {
    color: #ffffff;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.3);
}

.dark-mode .btn.primary:hover, 
.dark-mode #next-word:hover,
.dark-mode #show-definition:hover,
.dark-mode .submit-btn:hover,
.dark-mode .generate-example-btn:hover,
.dark-mode .generate-note-btn:hover,
.dark-mode .add-definition-btn:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

/* 优化删除按钮样式 */
.dark-mode .remove-definition-btn {
    background-color: #3a3a3a;
    color: #ffffff;
    border-color: #555555;
}

.dark-mode .remove-definition-btn:hover {
    background-color: #444444;
}

/* 确保两列表单布局的优化 */
.dark-mode .two-col-form {
    border-color: #444444;
}

/* 优化添加词义按钮 */
.dark-mode .add-definition-btn {
    background-color: #3a3a3a;
    border-color: #555555;
}

/* 优化词性选择下拉框 */
.dark-mode select option {
    background-color: #333333;
    color: #ffffff;
}

/* 优化自动保存提示 */
.dark-mode .auto-save-indicator,
.dark-mode .auto-save-status {
    background-color: #333333;
    color: #e0e0e0;
    border-color: #555555;
}

/* 夜间模式下按钮内图标 */
.dark-mode .btn svg,
.dark-mode .action-btn svg,
.dark-mode .word-nav-btn svg,
.dark-mode .back-to-top-btn svg {
    stroke: #ffffff;
}

/* 确保disabled按钮的样式正确 */
.dark-mode .btn:disabled,
.dark-mode input:disabled,
.dark-mode select:disabled,
.dark-mode textarea:disabled {
    background-color: #333333 !important;
    color: #888888 !important;
    opacity: 0.7;
}

/* 修复在夜间模式下"仅显示单词"状态下选中行的颜色 */
.dark-mode .word-table.simple-view tr.selected .word-cell {
    background-color: var(--table-row-selected);
}

/* 朗读按钮样式 */
#speak-word-btn {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    width: 38px;
    height: 38px;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

#speak-word-btn:hover {
    transform: scale(1.1);
    background-color: var(--primary-hover);
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.15);
}

#speak-word-btn:active {
    transform: scale(0.95);
}

.dark-mode #speak-word-btn {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

.dark-mode #speak-word-btn:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.4);
}

/* 添加朗读中状态样式 */
#speak-word-btn.playing {
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

/* 上一个单词朗读按钮样式 */
.prev-word-speak-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    margin-left: 6px;
    padding: 0;
    vertical-align: middle;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: all 0.2s ease;
}

.prev-word-speak-btn:hover {
    transform: scale(1.1);
    background-color: var(--primary-hover);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.15);
}

.prev-word-speak-btn:active {
    transform: scale(0.95);
}

.dark-mode .prev-word-speak-btn {
    background-color: var(--primary-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.dark-mode .prev-word-speak-btn:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.4);
}

/* word_list页面喇叭按钮样式 */
.speak-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    margin-left: 10px;
    padding: 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    transition: all 0.2s ease;
    vertical-align: middle;
}

.speak-btn:hover {
    transform: scale(1.1);
    background-color: var(--primary-hover);
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.15);
}

.speak-btn:active {
    transform: scale(0.95);
}

.speak-btn.playing {
    animation: pulse 1.5s infinite;
}

.word-title-container {
    display: flex;
    align-items: center;
}

.selected-word-container {
    display: flex;
    align-items: center;
}

.dark-mode .speak-btn {
    background-color: var(--primary-color);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

.dark-mode .speak-btn:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.4);
}