/**
 * 解题系统组件样式
 */

.problem-solver {
    width: 100%;
}

.problem-solver-header {
    margin-bottom: 30px;
    text-align: center;
}

.problem-solver-header h3 {
    font-size: 1.8rem;
    margin-bottom: 12px;
    color: var(--ls-text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.problem-solver-header h3 i {
    color: var(--ls-primary);
}

.problem-solver-desc {
    color: var(--ls-text-secondary);
    font-size: 1rem;
}

.problem-empty {
    text-align: center;
    padding: 60px 20px;
    color: var(--ls-text-secondary);
}

.problem-empty i {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.5;
}

.problem-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 24px;
}

.problem-card {
    transition: var(--ls-transition);
}

.problem-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--ls-shadow-lg);
    border-color: var(--ls-primary);
}

.problem-card-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 16px;
    gap: 12px;
}

.problem-card-header h4 {
    margin: 0;
    font-size: 1.2rem;
    color: var(--ls-text-primary);
    flex: 1;
}

.difficulty-badge {
    font-size: 0.75rem;
    padding: 4px 10px;
    border-radius: 99px;
    white-space: nowrap;
}

.difficulty-1, .difficulty-2 {
    background: var(--ls-secondary);
    color: white;
}

.difficulty-3, .difficulty-4 {
    background: var(--ls-accent);
    color: white;
}

.difficulty-5 {
    background: var(--ls-danger);
    color: white;
}

.problem-card-body {
    margin-bottom: 20px;
}

.problem-description {
    color: var(--ls-text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.problem-kps {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.problem-kps strong {
    font-size: 0.9rem;
    color: var(--ls-text-secondary);
}

.problem-card-actions {
    display: flex;
    gap: 12px;
}

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

/* 工作区样式 */
.problem-workspace {
    margin-top: 30px;
}

.problem-workspace-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--ls-border-color);
}

.problem-workspace-header h3 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--ls-text-primary);
    flex: 1;
}

.back-btn {
    color: var(--ls-text-secondary);
}

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

.problem-info {
    margin-bottom: 30px;
}

.problem-description-full {
    background: var(--ls-bg-secondary);
    padding: 20px;
    border-radius: var(--ls-radius-md);
    margin-bottom: 20px;
    line-height: 1.8;
    color: var(--ls-text-primary);
}

.prerequisites-panel {
    background: linear-gradient(135deg, var(--ls-primary-light), transparent);
    padding: 20px;
    border-radius: var(--ls-radius-md);
    border-left: 4px solid var(--ls-primary);
}

.prerequisites-panel h4 {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 12px 0;
    color: var(--ls-primary);
    font-size: 1.1rem;
}

.prerequisites-panel p {
    margin: 0 0 16px 0;
    color: var(--ls-text-secondary);
    font-size: 0.95rem;
}

.prerequisites-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.prerequisite-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--ls-bg-primary);
    border-radius: var(--ls-radius-md);
}

.kp-desc {
    font-size: 0.9rem;
    color: var(--ls-text-secondary);
    flex: 1;
}

.problem-sandbox {
    margin: 30px 0;
}

.problem-ai-assistant {
    margin-top: 30px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .problem-list {
        grid-template-columns: 1fr;
    }

    .problem-card-actions {
        flex-direction: column;
    }

    .problem-workspace-header {
        flex-direction: column;
        align-items: flex-start;
    }
}