/**
 * LunaStudy 学习阶段视图样式
 */

/* 阶段容器 */
.stage-container {
    margin-bottom: 30px;
}

/* 当前位置提示条 */
.stage-current-indicator {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 20px 24px;
    background: linear-gradient(135deg, var(--ls-primary-light) 0%, var(--ls-bg-secondary) 100%);
    border: 2px solid var(--ls-primary);
    border-radius: var(--ls-radius-lg);
    margin-bottom: 24px;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.15);
}

.stage-current-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.stage-current-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--ls-text-secondary);
    font-weight: 500;
}

.stage-current-label i {
    color: var(--ls-primary);
}

.stage-current-details {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.stage-current-name {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--ls-text-primary);
}

.stage-current-progress {
    font-size: 1rem;
    color: var(--ls-text-secondary);
    font-weight: 500;
}

.stage-current-hint {
    font-size: 0.85rem;
    color: var(--ls-text-secondary);
    margin: 0;
    line-height: 1.5;
}

.stage-next-action-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--ls-primary);
    color: white;
    border: none;
    border-radius: var(--ls-radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
}

.stage-next-action-btn:hover {
    background: var(--ls-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
}

.stage-next-action-btn:active {
    transform: translateY(0);
}

.stage-next-action-btn i {
    font-size: 0.9rem;
}

/* 阶段视图 */
.stage-view {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* 阶段选择器 */
.stage-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}

/* 阶段卡片 */
.stage-card {
    background: var(--ls-bg-secondary);
    border: 2px solid var(--ls-border-color);
    border-radius: var(--ls-radius-lg);
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.stage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--ls-primary);
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.stage-card:hover {
    border-color: var(--ls-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.15);
}

.stage-card:hover::before {
    transform: scaleY(1);
}

.stage-card.active {
    border-color: var(--ls-primary);
    background: var(--ls-primary-light);
    box-shadow: 0 4px 16px rgba(79, 70, 229, 0.2);
}

.stage-card.active::before {
    transform: scaleY(1);
}

.stage-card.locked {
    opacity: 0.6;
    cursor: not-allowed;
    background: var(--ls-bg-tertiary);
}

.stage-card.locked:hover {
    transform: none;
    border-color: var(--ls-border-color);
}

/* 阶段卡片头部 */
.stage-card-header {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
}

.stage-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--ls-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.stage-card.active .stage-number {
    background: var(--ls-primary-dark);
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
}

.stage-info {
    flex: 1;
    min-width: 0;
}

.stage-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--ls-text-primary);
    margin: 0 0 6px 0;
    line-height: 1.4;
}

.stage-description {
    font-size: 0.9rem;
    color: var(--ls-text-secondary);
    margin: 0;
    line-height: 1.5;
}

.stage-lock-icon {
    color: var(--ls-text-tertiary);
    font-size: 1.2rem;
    flex-shrink: 0;
}

/* 阶段卡片主体 */
.stage-card-body {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.stage-goal {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 10px;
    background: var(--ls-bg-tertiary);
    border-radius: var(--ls-radius);
    font-size: 0.9rem;
    color: var(--ls-text-secondary);
    line-height: 1.5;
}

.stage-goal i {
    color: var(--ls-primary);
    margin-top: 2px;
    flex-shrink: 0;
}

/* 阶段进度 */
.stage-progress {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.stage-progress-bar {
    width: 100%;
    height: 8px;
    background: var(--ls-bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.stage-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--ls-primary) 0%, var(--ls-primary-light) 100%);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.stage-card.active .stage-progress-fill {
    background: linear-gradient(90deg, var(--ls-primary-dark) 0%, var(--ls-primary) 100%);
    box-shadow: 0 0 8px rgba(79, 70, 229, 0.4);
}

.stage-progress-text {
    font-size: 0.85rem;
    color: var(--ls-text-secondary);
    font-weight: 500;
}

/* 阶段元信息 */
.stage-meta {
    display: flex;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--ls-text-tertiary);
}

.stage-time,
.stage-difficulty {
    display: flex;
    align-items: center;
    gap: 6px;
}

.stage-time i,
.stage-difficulty i {
    font-size: 0.9rem;
}

/* 阶段详情 */
.stage-details {
    background: var(--ls-bg-secondary);
    border: 1px solid var(--ls-border-color);
    border-radius: var(--ls-radius-lg);
    padding: 24px;
}

.stage-details-header {
    margin-bottom: 20px;
}

.stage-details-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--ls-text-primary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.stage-details-header i {
    color: var(--ls-primary);
}

.stage-details-body {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* 完成条件 */
.stage-completion-criteria h4,
.stage-nodes-preview h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--ls-text-primary);
    margin: 0 0 12px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.stage-completion-criteria h4 i,
.stage-nodes-preview h4 i {
    color: var(--ls-primary);
}

.criteria-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.criterion-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    background: var(--ls-bg-tertiary);
    border-radius: var(--ls-radius);
    font-size: 0.9rem;
    color: var(--ls-text-secondary);
    transition: all 0.2s ease;
}

.criterion-item.completed {
    background: rgba(16, 185, 129, 0.1);
    color: var(--ls-text-primary);
}

.criterion-item.completed i {
    color: #10b981;
}

.criterion-item:not(.completed) i {
    color: var(--ls-text-tertiary);
}

/* 节点预览 */
.nodes-preview-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.node-preview-tag {
    display: inline-block;
    padding: 6px 12px;
    background: var(--ls-bg-tertiary);
    border: 1px solid var(--ls-border-color);
    border-radius: var(--ls-radius);
    font-size: 0.85rem;
    color: var(--ls-text-secondary);
}

.node-preview-more {
    display: inline-block;
    padding: 6px 12px;
    font-size: 0.85rem;
    color: var(--ls-text-tertiary);
    font-style: italic;
}

/* 错误和空状态 */
.stage-error,
.stage-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--ls-text-secondary);
}

.stage-error i,
.stage-empty i {
    font-size: 2rem;
    color: var(--ls-text-tertiary);
    margin-bottom: 12px;
}

.stage-error p,
.stage-empty p {
    margin: 0;
    font-size: 0.95rem;
}

/* 面包屑导航 - 已移除，保留样式以备将来需要 */
/*
.kpn-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: var(--ls-bg-secondary);
    border-radius: var(--ls-radius);
    font-size: 0.9rem;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--ls-text-secondary);
    transition: color 0.2s ease;
}

.breadcrumb-item:hover {
    color: var(--ls-primary);
}

.breadcrumb-item.active {
    color: var(--ls-text-primary);
    font-weight: 500;
}

.breadcrumb-item i {
    font-size: 0.85rem;
}

.breadcrumb-separator {
    color: var(--ls-text-tertiary);
    font-size: 0.75rem;
}
*/

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

    .stage-card {
        padding: 16px;
    }

    .stage-details {
        padding: 16px;
    }

    .stage-current-indicator {
        flex-direction: column;
        align-items: stretch;
        padding: 16px;
    }

    .stage-next-action-btn {
        width: 100%;
        justify-content: center;
    }

    .stage-current-name {
        font-size: 1.1rem;
    }

    /* 面包屑导航样式已移除
    .kpn-breadcrumb {
        flex-wrap: wrap;
        font-size: 0.85rem;
    }
    */
}