/* 自定义样式 */
.word-card {
    background-color: #f8f9fa;
    border: 2px solid #dee2e6;
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.word-card:hover {
    background-color: #e9ecef;
    border-color: #adb5bd;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.word-card.unknown {
    background-color: #ffebee;
    border-color: #f44336;
}

.word-text {
    font-size: 16px;
    font-weight: 500;
    color: #495057;
    word-break: break-word;
}

.question-text {
    font-size: 20px;
    font-weight: 600;
    color: #212529;
    margin-bottom: 20px;
}

.options-container {
    margin-top: 20px;
}

.form-check {
    margin-bottom: 15px;
    padding: 10px;
    border: 1px solid #dee2e6;
    border-radius: 5px;
    transition: background-color 0.2s ease;
}

.form-check:hover {
    background-color: #f8f9fa;
}

.form-check-input:checked + .form-check-label {
    font-weight: 600;
    color: #0d6efd;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .word-grid {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 8px !important;
    }
    
    .word-card {
        padding: 10px;
        min-height: 60px;
    }
    
    .word-text {
        font-size: 14px;
    }
    
    .question-text {
        font-size: 18px;
    }
}

/* 动画效果 */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

/* 卡片悬停效果 */
.card {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

/* 按钮样式增强 */
.btn {
    transition: all 0.2s ease;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

/* 表格样式 */
.table th {
    border-top: none;
    font-weight: 600;
}

.table-hover tbody tr:hover {
    background-color: rgba(0,123,255,0.1);
}

/* 进度条样式 */
.progress {
    border-radius: 10px;
    overflow: hidden;
}

.progress-bar {
    transition: width 0.6s ease;
}

/* 模态框样式 */
.modal-content {
    border-radius: 10px;
    border: none;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.modal-header {
    border-bottom: 1px solid #dee2e6;
    border-radius: 10px 10px 0 0;
}

.modal-footer {
    border-top: 1px solid #dee2e6;
    border-radius: 0 0 10px 10px;
}

/* 统计卡片样式 */
.card.bg-primary,
.card.bg-success,
.card.bg-info,
.card.bg-warning {
    border: none;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.card.bg-primary:hover,
.card.bg-success:hover,
.card.bg-info:hover,
.card.bg-warning:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}

/* 徽章样式 */
.badge {
    font-size: 0.85em;
    padding: 0.5em 0.75em;
}

/* 导航栏样式 */
.navbar-brand {
    font-weight: 600;
}

.navbar-nav .nav-link {
    font-weight: 500;
}

/* 表单样式 */
.form-control:focus {
    border-color: #0d6efd;
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.form-select:focus {
    border-color: #0d6efd;
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

/* 警告框样式 */
.alert {
    border: none;
    border-radius: 8px;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #0d6efd;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 文件列表样式 */
.file-item {
    transition: all 0.2s ease;
    border: 1px solid #dee2e6;
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 10px;
}

.file-item:hover {
    border-color: #adb5bd;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transform: translateY(-1px);
}

.file-item .btn-outline-danger {
    opacity: 0.7;
    transition: opacity 0.2s ease;
}

.file-item:hover .btn-outline-danger {
    opacity: 1;
}

.file-item .btn-outline-danger:hover {
    transform: scale(1.1);
}

/* 删除确认对话框样式 */
.delete-confirmation {
    background-color: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 8px;
    padding: 15px;
    margin: 10px 0;
}

.delete-confirmation ul {
    margin-bottom: 0;
    padding-left: 20px;
}

.delete-confirmation li {
    margin-bottom: 5px;
}