.tool-fullwidth {
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0;
}

/* Tool shell */
.game-tool {
    max-width: 100%;
    margin: 0 auto;
}

.game-tool.editor-section,
.editor-section.game-tool {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.game-tool .card {
    border: 1px solid var(--color-border, #e5e7eb);
    box-shadow: var(--shadow-sm, 0 1px 3px rgba(0, 0, 0, 0.06));
    border-radius: var(--radius, 12px);
    background: var(--color-surface, #fff);
}

.game-tool .card-body {
    padding: 1.25rem 1.35rem;
}

.game-tool .card-title {
    color: var(--color-text, #1f2937);
    font-weight: 700;
    font-size: 1.05rem;
}

.game-tool .form-control,
.game-tool .form-select,
.game-tool .select-input,
.game-tool textarea {
    border-radius: 8px;
    border: 1px solid var(--color-border, #e5e7eb);
}

.game-tool .form-control:focus,
.game-tool .form-select:focus,
.game-tool textarea:focus {
    border-color: var(--color-primary, #0d9488);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

.game-tool .btn-primary {
    background: var(--color-primary, #0d9488);
    border-color: var(--color-primary, #0d9488);
}

.game-tool .btn-primary:hover {
    background: var(--color-primary-hover, #0f766e);
    border-color: var(--color-primary-hover, #0f766e);
}

.game-tool .alert {
    border-radius: 10px;
}

[data-theme="dark"] .game-tool .card {
    background: var(--color-surface, #1f2937);
    border-color: var(--color-border, #374151);
}

[data-theme="dark"] .game-tool .card-title,
[data-theme="dark"] .game-tool .form-label,
[data-theme="dark"] .game-tool {
    color: var(--color-text, #f9fafb);
}

[data-theme="dark"] .game-tool .text-muted,
[data-theme="dark"] .game-tool .form-text {
    color: var(--color-text-secondary, #9ca3af) !important;
}

[data-theme="dark"] .game-tool .form-control,
[data-theme="dark"] .game-tool .form-select,
[data-theme="dark"] .game-tool textarea {
    background: #111827;
    color: var(--color-text, #f9fafb);
    border-color: var(--color-border, #374151);
}

/* --- tool: division-table-trainer --- */
/* 除法训练器样式 */
.division-trainer {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* 控制面板样式 */
.control-panel {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.control-panel .form-label {
    color: white;
    font-size: 14px;
    margin-bottom: 8px;
}

.control-panel .form-select {
    border: none;
    border-radius: 8px;
    padding: 10px 15px;
    font-size: 14px;
    background: rgba(255, 255, 255, 0.9);
    transition: all 0.3s ease;
}

.control-panel .form-select:focus {
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
    background: white;
}

.control-panel .btn {
    border-radius: 8px;
    padding: 10px 20px;
    font-weight: 600;
    transition: all 0.3s ease;
}

/* 问题显示区域 */
.question-display {
    text-align: center;
    margin: 40px 0;
    padding: 30px;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.question-text {
    font-size: 3.5rem;
    font-weight: bold;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    margin: 0;
}

/* 反馈消息 */
.feedback-message {
    text-align: center;
    padding: 15px 30px;
    border-radius: 10px;
    font-size: 18px;
    font-weight: 600;
    margin: 20px 0;
    animation: fadeIn 0.5s ease;
}

.feedback-message.success {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
}

.feedback-message.error {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    color: white;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 答案网格 */
.answer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 15px;
    margin: 30px 0;
    padding: 0 20px;
}

.answer-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 12px;
    padding: 20px;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    min-height: 80px;
}

.answer-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.answer-btn:active {
    transform: translateY(-1px);
}

.answer-btn:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

.answer-btn.correct {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    animation: correctPulse 0.6s ease;
}

.answer-btn.incorrect {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    animation: incorrectShake 0.6s ease;
}

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

@keyframes incorrectShake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* 下一题按钮 */
.next-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 12px;
    padding: 15px 30px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.next-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

/* 统计面板 */
.statistics-panel {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 15px;
    padding: 25px;
    margin-top: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.stat-item {
    text-align: center;
    color: white;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 5px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.stat-label {
    font-size: 14px;
    opacity: 0.9;
    font-weight: 500;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .question-text {
        font-size: 2.5rem;
    }
    
    .answer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    
    .answer-btn {
        font-size: 20px;
        padding: 15px;
        min-height: 60px;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .control-panel .row {
        text-align: center;
    }
    
    .control-panel .col-md-3 {
        margin-bottom: 15px;
    }
}

@media (max-width: 480px) {
    .division-trainer {
        padding: 10px;
    }
    
    .question-text {
        font-size: 2rem;
    }
    
    .answer-grid {
        grid-template-columns: 1fr;
    }
    
    .answer-btn {
        font-size: 18px;
        padding: 12px;
        min-height: 50px;
    }
}