/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

/* 导航栏 */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: #667eea;
}

.nav-logo i {
    margin-right: 10px;
    font-size: 2rem;
}

.nav-menu {
    display: flex;
    gap: 10px;
}

.nav-btn {
    background: none;
    border: none;
    padding: 10px 15px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    color: #666;
}

.nav-btn:hover {
    background: #f0f0f0;
    color: #667eea;
}

.nav-btn.active {
    background: #667eea;
    color: white;
}

/* 主要内容区域 */
.main-content {
    max-width: 1200px;
    margin: 20px auto;
    padding: 0 20px;
}

.container {
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

/* 头部样式 */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

.header h1, .header h2 {
    margin-bottom: 15px;
    font-size: 2rem;
}

.stats {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 20px;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.1rem;
}

/* 标签页内容 */
.tab-content {
    display: none;
    padding: 30px;
}

.tab-content.active {
    display: block;
}

/* 筛选区域 */
.filter-section {
    margin-bottom: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.filter-section label {
    font-weight: 600;
    color: #555;
}

.filter-section select {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 1rem;
    min-width: 150px;
}

/* 词条网格 */
.entries-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

/* 词条卡片 */
.entry-card {
    background: white;
    border: 1px solid #e0e0e0;
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.entry-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
}

.entry-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.entry-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
}

.entry-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 5px;
}

.entry-category {
    background: #667eea;
    color: white;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

.entry-explanation {
    color: #666;
    margin-bottom: 15px;
    line-height: 1.5;
}

.entry-actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #666;
}

.empty-state i {
    font-size: 4rem;
    color: #ddd;
    margin-bottom: 20px;
}

.empty-state h3 {
    margin-bottom: 10px;
    color: #333;
}

/* 表单样式 */
.form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #555;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.category-input {
    display: flex;
    gap: 10px;
}

.category-input select {
    flex: 1;
}

.form-actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

/* 按钮样式 */
.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #f8f9fa;
    color: #666;
    border: 2px solid #e0e0e0;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-secondary:hover {
    background: #e9ecef;
    border-color: #667eea;
    color: #667eea;
}

.btn-danger {
    background: #dc3545;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-danger:hover {
    background: #c82333;
    transform: translateY(-2px);
}

/* 搜索区域 */
.search-section {
    margin-bottom: 30px;
}

.search-input {
    display: flex;
    gap: 15px;
    max-width: 500px;
}

.search-input input {
    flex: 1;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
}

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

/* 分类管理 */
.categories-section {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 30px;
}

.add-category {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
}

.category-form {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.category-form input {
    flex: 1;
}

.categories-list {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
}

.category-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background: white;
    border-radius: 8px;
    margin-bottom: 10px;
    border: 1px solid #e0e0e0;
}

.category-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.category-name {
    font-weight: 600;
    color: #333;
}

.category-count {
    background: #667eea;
    color: white;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.8rem;
}

/* 导出区域 */
.export-section {
    display: grid;
    gap: 30px;
}

.export-options,
.import-section,
.backup-section {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
}

.export-buttons {
    display: flex;
    gap: 15px;
    margin-top: 15px;
    flex-wrap: wrap;
}

.import-area {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-top: 15px;
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 0;
    border-radius: 15px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.modal-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-radius: 15px 15px 0 0;
}

.modal-close {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background 0.3s ease;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

.modal-body {
    padding: 20px;
}

/* 通知提示 */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: #28a745;
    color: white;
    padding: 15px 20px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    z-index: 3000;
    display: none;
    align-items: center;
    gap: 10px;
    max-width: 400px;
}

.notification.error {
    background: #dc3545;
}

.notification.warning {
    background: #ffc107;
    color: #333;
}

.notification-close {
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 代码块样式 */
.code-block {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 6px;
    padding: 15px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.4;
    overflow-x: auto;
    margin: 10px 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        height: auto;
        padding: 15px 20px;
    }
    
    .nav-menu {
        margin-top: 15px;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .stats {
        flex-direction: column;
        gap: 15px;
    }
    
    .entries-grid {
        grid-template-columns: 1fr;
    }
    
    .categories-section {
        grid-template-columns: 1fr;
    }
    
    .export-buttons {
        flex-direction: column;
    }
    
    .search-input {
        flex-direction: column;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .category-input {
        flex-direction: column;
    }
    
    .modal-content {
        width: 95%;
        margin: 10% auto;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 0 10px;
    }
    
    .header {
        padding: 20px;
    }
    
    .header h1 {
        font-size: 1.5rem;
    }
    
    .tab-content {
        padding: 20px;
    }
    
    .filter-section {
        flex-direction: column;
        align-items: stretch;
    }
}