/* 学习模式专用样式：学科详情、学习卡片、知识点列表与详情等 */

/* 学科详情视图：面包屑与返回按钮 */
.portal-breadcrumb {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 4px;
    width: 100%;
    min-height: 32px;
}

.portal-breadcrumb__back {
    border: none;
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 500;
    color: var(--um-text-primary);
    background: var(--um-bg-secondary);
    border: 1px solid var(--um-border);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    box-shadow: var(--um-shadow);
    transition: background 0.15s ease, border-color 0.15s ease, transform 0.1s ease, box-shadow 0.15s ease;
}

.portal-breadcrumb__back:hover {
    background: var(--um-bg-hover);
    border-color: var(--um-accent);
    color: var(--um-text-primary);
    transform: translateY(-0.5px);
    box-shadow: var(--um-shadow);
}

.portal-breadcrumb__back:active {
    transform: translateY(0);
    box-shadow: 0 4px 10px rgba(15, 23, 42, 0.9);
}

.portal-breadcrumb__label {
    font-size: 12px;
    color: var(--um-text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
    flex: 1 1 auto;
}

/* 面包屑展开/收起按钮 */
.portal-breadcrumb__toggle {
    border: none;
    padding: 2px 6px;
    border-radius: 9999px;
    font-size: 11px;
    color: var(--um-text-secondary);
    background: transparent;
    cursor: pointer;
    transition: background 0.12s ease, color 0.12s ease, transform 0.08s ease;
}

.portal-breadcrumb__toggle:hover {
    background: var(--um-bg-hover);
    color: var(--um-text-primary);
    transform: translateY(-0.5px);
}

.portal-breadcrumb__toggle {
    margin-left: auto;
    flex: 0 0 auto;
}

/* 行业通用：头部导航行（返回 + 可点击面包屑） */
.portal-header-nav-row {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    min-width: 0;
}

.portal-breadcrumb__trail {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-width: 0;
    flex: 1 1 auto;
    white-space: nowrap;
    overflow: hidden;
}

.portal-breadcrumb__sep {
    color: var(--um-text-muted);
    flex: 0 0 auto;
}

.portal-breadcrumb__crumb {
    border: none;
    background: transparent;
    color: var(--um-text-secondary);
    font-size: 12px;
    padding: 2px 4px;
    border-radius: 6px;
    cursor: pointer;
    flex: 0 1 auto;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
}

.portal-breadcrumb__crumb:hover {
    color: var(--um-text-primary);
    background: var(--um-bg-hover);
}

.portal-breadcrumb__current {
    color: var(--um-text-primary);
    font-size: 12px;
    font-weight: 600;
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 折叠状态：隐藏文字标签，仅保留返回按钮与折叠图标 */
.portal-breadcrumb.is-collapsed .portal-breadcrumb__label {
    display: none;
}

/* 页面级整体进度条（根节点与学科详情页通用） */
.portal-summary-progress {
    margin-top: 4px;
    height: 8px;
}

/* 学科详情视图布局 */
.portal-subject-detail {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.portal-subject-detail__summary {
    padding: 10px 12px;
    border-radius: 12px;
    background: var(--um-bg-secondary);
    border: 1px solid var(--um-border);
    box-shadow: var(--um-shadow);
}

.portal-subject-detail__summary-title {
    margin: 0 0 4px;
    font-size: 14px;
    font-weight: 600;
    color: var(--um-text-primary);
}

.portal-subject-detail__summary-text {
    margin: 0 0 8px;
    font-size: 13px;
    color: var(--um-text-secondary);
}

.portal-subject-detail__summary-progress {
    margin-top: 2px;
}

.portal-home-card--learning .portal-home-header {
	margin-bottom: 14px;
	padding: 10px 12px 12px;
	border-radius: 12px;
	background: var(--um-bg-secondary);
	border: 1px solid var(--um-border);
	box-shadow: var(--um-shadow);
	display: flex;
	flex-direction: column;
	gap: 4px;
	align-items: center;
	text-align: center;
}

.portal-home-card--learning .portal-home-header h2 {
	margin: 0;
	font-size: 18px;
	font-weight: 600;
	color: var(--um-text-primary);
}

.portal-home-card--learning .portal-home-header p {
	margin: 0;
	font-size: 13px;
	color: var(--um-text-secondary);
}

.portal-home-card--kp-list .portal-home-header,
.portal-home-card--kp-detail .portal-home-header {
    margin-bottom: 14px;
    padding: 10px 12px 12px;
    border-radius: 12px;
    background: var(--um-bg-secondary);
    border: 1px solid var(--um-border);
    box-shadow: var(--um-shadow);
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: stretch;
    text-align: left;
}

/* 知识点详情页：顶部工具区固定，正文区域独立滚动 */
.portal-home-card--kp-detail {
    display: flex;
    flex-direction: column;
    min-height: 560px;
    max-height: calc(100vh - 150px);
    min-width: 0;
    max-width: 100%;
}

.portal-home-card--kp-list .portal-home-header h2,
.portal-home-card--kp-detail .portal-home-header h2 {
    margin: 0;
    font-size: 19px;
    font-weight: 600;
    color: var(--um-text-primary);
    line-height: 1.3;
}

.portal-home-card--kp-list .portal-home-header p,
.portal-home-card--kp-detail .portal-home-header p {
    margin: 0;
    font-size: 13px;
    color: var(--um-text-secondary);
    line-height: 1.45;
}

.portal-home-card--kp-list .portal-breadcrumb {
    justify-content: flex-start;
}

.portal-home-card--kp-list .portal-kp-filter {
    justify-content: flex-start;
    align-items: center;
}

.portal-home-card--kp-detail .portal-kp-detail__title-row {
    width: 100%;
    justify-content: space-between;
    align-items: flex-start;
    gap: 10px;
}

.portal-home-card--kp-detail .portal-kp-detail__title-right {
    margin-left: auto;
}

.portal-subject-detail__list-section {
    padding: 8px 0 4px;
}

.portal-subject-detail__section-title {
    margin: 0 0 6px;
    font-size: 13px;
    font-weight: 600;
    color: var(--um-text-primary);
}

.portal-subject-detail__list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.portal-subject-detail__row {
    padding: 6px 8px;
    border-radius: 10px;
    background: var(--um-bg-panel);
    border: 1px solid var(--um-border);
    box-shadow: var(--um-shadow);
}

.portal-subject-detail__name {
    font-size: 13px;
    color: var(--um-text-primary);
    margin-bottom: 4px;
}

.portal-subject-detail__stat {
    font-size: 12px;
    color: var(--um-text-secondary);
    margin-bottom: 4px;
}

.portal-subject-detail__progress {
    height: 8px;
}

/* 学习进度卡片区域 */
.portal-learning-body {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 14px;
}

/* 知识点网格视图 */
.portal-kp-list {
    margin-top: 10px;
    /* 不再单独滚动，由 portal-content 统一滚动 */
    overflow: visible;
    padding-right: 4px;
}

/* 知识点列表顶部筛选条 */
.portal-kp-filter {
    margin-top: 8px;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    font-size: 12px;
}

.portal-kp-filter__btn {
    border-radius: 9999px;
    font-size: 12px;
    background: transparent;
    color: var(--um-text-secondary);
    transition: background 0.15s ease, color 0.15s ease, transform 0.08s ease;
}

.portal-kp-filter__btn:hover {
    background: var(--um-bg-hover);
    color: var(--um-text-primary);
    transform: translateY(-0.5px);
}

.portal-kp-filter__btn.is-active {
    background: linear-gradient(135deg, var(--um-accent), var(--um-accent-hover));
    color: var(--um-text-on-accent);
}

.portal-kp-grid {
    margin-top: 14px;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

@media (max-width: 960px) {
    .portal-kp-grid {
        grid-template-columns: 1fr;
    }
}

.portal-kp-card {
    border-radius: 12px;
    padding: 10px 12px;
    background: var(--um-bg-panel);
    border: 1px solid var(--um-border);
    box-shadow: var(--um-shadow);
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

/* 未掌握的知识点卡片：淡橙色基调 + 左侧强调条 */
.portal-kp-card--pending {
    border-color: color-mix(in srgb, var(--um-warning) 60%, var(--um-border));
    background: linear-gradient(135deg,
                    color-mix(in srgb, var(--um-warning) 6%, transparent) 0%,
                    transparent 50%),
                var(--um-bg-panel);
    position: relative;
}

.portal-kp-card--pending::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    bottom: 8px;
    width: 3px;
    border-radius: 0 2px 2px 0;
    background: linear-gradient(180deg, var(--um-warning), color-mix(in srgb, var(--um-warning) 50%, var(--um-accent)));
}

/* 已掌握的知识点卡片：绿色渐变背景 + 发光边框 + 左侧成功条 */
.portal-kp-card--completed {
    border-color: var(--um-success);
    background: linear-gradient(135deg,
                    color-mix(in srgb, var(--um-success) 12%, transparent) 0%,
                    color-mix(in srgb, var(--um-success) 4%, transparent) 50%,
                    transparent 100%),
                var(--um-bg-panel);
    box-shadow: 
        0 0 0 1px color-mix(in srgb, var(--um-success) 25%, transparent),
        0 4px 12px color-mix(in srgb, var(--um-success) 15%, transparent),
        var(--um-shadow);
    position: relative;
}

.portal-kp-card--completed::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    bottom: 8px;
    width: 4px;
    border-radius: 0 2px 2px 0;
    background: linear-gradient(180deg, var(--um-success), color-mix(in srgb, var(--um-success) 70%, var(--um-accent)));
}

/* 已掌握卡片标题带成功色 */
.portal-kp-card--completed .portal-kp-card__title {
    color: var(--um-success);
}

/* 已掌握卡片悬停时增强发光 */
.portal-kp-card--completed:hover {
    box-shadow: 
        0 0 0 2px color-mix(in srgb, var(--um-success) 40%, transparent),
        0 6px 20px color-mix(in srgb, var(--um-success) 25%, transparent),
        var(--um-shadow);
}

.portal-kp-card__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.portal-kp-card__head-right {
    display: flex;
    align-items: center;
    gap: 6px;
}

.portal-kp-card__title {
    margin: 0;
    font-size: 14px;
    font-weight: 600;
    color: var(--um-text-primary);
}

.portal-kp-card__difficulty {
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 9999px;
    border: 1px solid var(--um-accent);
    color: var(--um-accent);
    white-space: nowrap;
}

.portal-kp-card__status {
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 9999px;
    background: linear-gradient(135deg, var(--um-success), var(--um-accent));
    color: var(--um-text-on-accent);
    font-weight: 600;
    white-space: nowrap;
}

.portal-kp-card__body {
    font-size: 13px;
    color: var(--um-text-secondary);
    display: flex;
    flex-direction: column;
    gap: 4px;
    border-top: 1px dashed rgba(249, 250, 251, 0.35);
    padding-top: 6px;
    margin-top: 4px;
}

.portal-kp-card__summary {
    margin: 0;
}

.portal-kp-card__meta {
    font-size: 12px;
    color: var(--um-text-secondary);
}

.portal-kp-card__actions {
    margin-top: 8px;
    display: flex;
    justify-content: flex-end;
}

/* 知识点详情视图 */
.portal-kp-detail-scroll {
    margin-top: 10px;
    flex: 1 1 auto;
    min-height: 0;
    overflow: auto;
    padding-right: 4px;
}

.portal-kp-detail {
    margin-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* 学习模式内部：顶部状态条固定，便于长内容时保留核心导航信息 */
.portal-kp-teaching__top {
    position: sticky;
    top: 0;
    z-index: 3;
    background: var(--um-bg-panel);
    padding-bottom: 6px;
}

.portal-kp-detail__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.portal-kp-detail__meta-item {
    font-size: 12px;
    color: var(--um-text-secondary);
}

.portal-kp-detail__section {
    padding-top: 4px;
}

.portal-kp-detail__section-title {
    margin: 0 0 4px;
    font-size: 14px;
    font-weight: 600;
    color: var(--um-text-primary);
}

.portal-kp-detail__section-body {
    font-size: 13px;
    color: var(--um-text-secondary);
    /* 嵌套自带版式（大盒子、表格、代码）时避免把外层 flex 布局撑出视口 */
    max-width: 100%;
    min-width: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.portal-kp-detail__embed {
    margin-top: 8px;
    border-radius: 12px;
    border: 1px solid var(--um-border);
    overflow: hidden;
    background: var(--um-bg-primary);
    position: relative;
    min-height: 360px;
}

.portal-kp-detail__embed iframe {
    width: 100%;
    height: 69vh;
    max-height: 69vh;
    min-height: 320px;
    border: none;
    background: #ffffff;
}

/* 外部链接 iframe 顶部遮挡层（用于遮住飞书等站点的登录导航条） */
.portal-kp-detail__mask {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 65px;
    background: var(--um-bg-primary);
    z-index: 2;
    pointer-events: none;
}

.portal-kp-detail__title-row {
    margin-top: 4px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    flex-wrap: wrap;
}

.portal-kp-detail__title {
    margin: 0;
}

.portal-kp-detail__title-right {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
    flex-wrap: wrap;
}

/* 知识点详情标题右侧控件整体容器（难度/标签 + 视图切换 + 资源文件 + 掌握按钮） */
.portal-kp-detail__tools {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    padding: 8px 10px;
    border: 1px solid var(--um-border);
    border-radius: 10px;
    background: color-mix(in srgb, var(--um-bg-secondary) 84%, transparent);
}

/* 详情右侧工具栏展开/收起按钮 */
.portal-kp-detail__tools-toggle {
    border: none;
    padding: 2px 6px;
    border-radius: 9999px;
    font-size: 11px;
    color: var(--um-text-secondary);
    background: transparent;
    cursor: pointer;
    transition: background 0.12s ease, color 0.12s ease, transform 0.08s ease;
}

.portal-kp-detail__tools-toggle:hover {
    background: var(--um-bg-hover);
    color: var(--um-text-primary);
    transform: translateY(-0.5px);
}

/* 折叠状态：隐藏标签、视图切换按钮和资源按钮，仅保留难度徽章与掌握按钮 */
.portal-kp-detail__tools.is-collapsed .portal-kp-detail__meta-item,
.portal-kp-detail__tools.is-collapsed .portal-kp-detail__actions {
    display: none;
}

.portal-kp-detail__actions {
    margin-top: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

/* 内容导航区：用于强调“这里有可查看内容” */
.portal-kp-detail__view-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.portal-kp-detail__view-nav-title {
    font-size: 11px;
    font-weight: 700;
    color: var(--um-text-secondary);
    letter-spacing: 0.3px;
    text-transform: uppercase;
}

.portal-kp-detail__view-tabs {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.portal-kp-detail__view-tab {
    border-radius: 9999px;
    padding: 5px 12px;
    font-size: 12px;
    border: 1px solid color-mix(in srgb, var(--um-accent) 35%, var(--um-border));
    background: color-mix(in srgb, var(--um-accent) 16%, var(--um-bg-panel));
    color: var(--um-text-primary);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all 0.15s ease;
}

.portal-kp-detail__view-tab::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 9999px;
    background: color-mix(in srgb, var(--um-accent) 82%, #fff);
}

.portal-kp-detail__view-tab:hover {
    border-color: var(--um-accent);
    transform: translateY(-0.5px);
}

.portal-kp-detail__view-tab.is-active {
    background: linear-gradient(135deg, var(--um-accent), var(--um-accent-hover));
    color: var(--um-text-on-accent);
    border-color: transparent;
    box-shadow: 0 6px 14px rgba(56, 189, 248, 0.38);
}

.portal-kp-detail__view-tab.is-active::before {
    background: var(--um-text-on-accent);
}

/* 状态操作区：与内容导航显著区分 */
.portal-kp-detail__status-actions {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: auto;
    flex-wrap: wrap;
}

.portal-kp-detail__resource-btn {
    border-radius: 9999px;
    padding: 5px 12px;
    font-size: 12px;
    border: 1px solid color-mix(in srgb, var(--um-success) 40%, var(--um-border));
    background: color-mix(in srgb, var(--um-success) 16%, var(--um-bg-panel));
    color: var(--um-text-primary);
    cursor: pointer;
    transition: all 0.15s ease;
}

.portal-kp-detail__resource-btn:hover {
    border-color: var(--um-success);
    transform: translateY(-0.5px);
}

.portal-kp-detail__btn {
    border-radius: 9999px;
    padding: 5px 14px;
    font-size: 13px;
    border: none;
    background: linear-gradient(135deg, var(--um-accent), var(--um-accent-hover));
    color: var(--um-text-on-accent);
    cursor: pointer;
    box-shadow: 0 6px 16px rgba(56, 189, 248, 0.45);
    transition: background 0.15s ease, box-shadow 0.15s ease, transform 0.1s ease;
}

.portal-kp-detail__btn:hover {
    background: linear-gradient(135deg, var(--um-accent-hover), var(--um-accent));
    box-shadow: 0 8px 20px rgba(56, 189, 248, 0.65);
    transform: translateY(-0.5px);
}

.portal-kp-detail__btn:active {
    box-shadow: 0 3px 8px rgba(15, 23, 42, 0.9);
    transform: translateY(0);
}

.portal-kp-detail__btn.is-active {
    background: linear-gradient(135deg, var(--um-success), var(--um-accent));
    box-shadow: 0 7px 18px rgba(34, 197, 94, 0.55);
}

.portal-kp-detail__master-btn {
    border-radius: 9999px;
    padding: 4px 14px;
    min-width: 82px;
    font-size: 12px;
    border: 1px solid var(--um-border);
    background: var(--um-bg-panel);
    color: var(--um-text-primary);
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.55);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease, transform 0.1s ease;
}

.portal-kp-detail__master-btn.is-on {
    background: linear-gradient(135deg, var(--um-success), var(--um-accent));
    border-color: var(--um-success);
    color: var(--um-text-on-accent);
    box-shadow: 0 7px 18px rgba(34, 197, 94, 0.55);
}

.portal-kp-detail__master-btn:hover {
    transform: translateY(-0.5px);
}

/* 学习卡片整体结构与风格 */
.portal-learning-card {
    flex: 1 1 100%;
    min-width: 100%;
    border-radius: 12px;
    padding: 0 12px 0 0;
    background: var(--um-bg-panel);
    border: 1px solid var(--um-border);
    box-shadow: var(--um-shadow);
    box-sizing: border-box;
    position: relative;
    overflow: hidden;
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.portal-learning-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--um-shadow);
    border-color: var(--um-accent);
}

.portal-learning-card--child {
    border-radius: 10px;
    padding: 4px 6px 4px;
    background: var(--um-bg-secondary);
    border-color: var(--um-border);
    box-shadow: none;
    transform: none;
}

/* 学习卡片整体布局：左缩略图 + 右侧内容一体化 */
.portal-learning-card__inner {
    position: relative;
}

.portal-learning-card__side {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    width: 112px;
}

.portal-learning-card__content {
    margin-left: 120px;
    padding: 10px 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 10px;
}

.portal-learning-card__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.portal-learning-card__head h3 {
    margin: 0;
    font-size: 15px;
    font-weight: 600;
    color: var(--um-text-primary);
}

.portal-learning-card__stat {
    font-size: 12px;
}

.portal-learning-card__progress-row {
    margin-top: 6px;
}

.portal-learning-card__desc {
    margin-top: 6px;
    font-size: 13px;
    color: var(--um-text-secondary);
}

.portal-learning-card__progress {
    position: relative;
    width: 100%;
    height: 10px;
    border-radius: 9999px;
    background: var(--um-bg-secondary);
    overflow: hidden;
    margin: 0;
}

.portal-learning-card__progress-bar {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    border-radius: 9999px;
    background: linear-gradient(90deg, var(--um-success), var(--um-accent));
    transition: width 0.22s ease-out;
}

.portal-learning-card__actions {
    margin-top: 8px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 10px;
}

.portal-learning-card__btn {
    border-radius: 9999px;
    font-size: 13px;
    font-weight: 500;
}

.portal-learning-card__children {
    margin-top: 6px;
    padding: 4px 0;
    border-radius: 0;
    background: transparent;
    border: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.portal-learning-empty {
    margin: 4px 0 0;
    font-size: 13px;
    color: var(--um-text-secondary);
}

.portal-learning-loading h2 {
    font-size: 16px;
}

/* 学习卡片：手机端紧凑布局（保持左右结构，尽量减少高度） */
@media (max-width: 640px) {
    .portal-learning-card {
        padding: 4px 8px 4px 0;
    }

    .portal-learning-card__inner {
        display: flex;
        align-items: stretch;
    }

    .portal-learning-card__side {
        position: relative;
        top: auto;
        bottom: auto;
        left: 0;
        width: 84px;
        flex: 0 0 84px;
        overflow: hidden; /* 裁剪溢出的图片，避免遮挡右侧内容 */
        border-top-left-radius: 10px;
        border-bottom-left-radius: 10px;
    }

    .portal-learning-card__thumb,
    .portal-learning-card__thumb img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        display: block;
    }

    .portal-learning-card__content {
        margin-left: 8px; /* 与缩略图之间留一点空隙 */
        padding: 4px 0 4px;
        gap: 4px;
    }

    .portal-learning-card__head {
        gap: 6px;
        align-items: flex-start;
    }

    .portal-learning-card__head h3 {
        font-size: 13px;
    }

    .portal-learning-card__stat {
        font-size: 11px;
        white-space: nowrap;
    }

    .portal-learning-card__progress-row {
        margin-top: 4px;
    }

    /* 手机端为节省高度，隐藏学科简介文本 */
    .portal-learning-card__desc {
        display: none;
    }

    .portal-learning-card__actions {
        margin-top: 4px;
        justify-content: flex-start;
        gap: 6px;
        flex-wrap: wrap;
    }

    .portal-learning-card__actions .portal-learning-card__btn {
        font-size: 12px;
        min-width: 0;
    }
}

/* 移动端/小屏下的知识点详情自适配调整 */
@media (max-width: 960px) {
    /* 面包屑在小屏下使用更紧凑结构：默认折叠，仅显示返回按钮和折叠图标 */
    .portal-breadcrumb {
        margin-bottom: 4px;
        gap: 4px;
    }

    .portal-header-nav-row {
        gap: 6px;
    }

    .portal-breadcrumb__trail {
        gap: 4px;
    }

    .portal-breadcrumb__back {
        padding: 5px 10px;
    }

    .portal-home-card--kp-list .portal-home-header,
    .portal-home-card--kp-detail .portal-home-header {
        gap: 6px;
        padding: 10px;
    }

    .portal-home-card--kp-detail {
        max-height: none;
        min-height: 0;
    }

    .portal-kp-detail__status-actions {
        margin-left: 0;
        width: 100%;
        justify-content: flex-start;
    }

    /* 小屏下「学习中 / 进度」与操作按钮分两行，避免横向挤压与垂直错位 */
    .portal-kp-teaching__status-row {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
    }

    .portal-kp-teaching__status-left {
        width: 100%;
    }

    .portal-kp-teaching__status-right {
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .portal-kp-teaching__status-right > .student-btn {
        width: 100%;
        min-height: 44px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .portal-kp-detail-scroll {
        /* 小屏下以页面滚动为主，避免双滚动条影响手势 */
        max-height: none;
        overflow: visible;
        padding-right: 0;
    }

    .portal-kp-detail__embed {
        /* 交给内部 iframe 自然决定高度 */
        min-height: 0;
    }

    .portal-kp-detail__embed iframe {
        /* 小屏下不固定 65vh，高度随内容自适应 */
        height: auto;
        max-height: none;
        min-height: 240px;
    }

    /* 详细内容整体宽度适配屏幕 */
    .portal-kp-detail__section-body {
        max-width: 100%;
        overflow-x: hidden;
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    /* 教程模板常见 .container：作者常写 max-width:900px 但未写 width:100%，小屏会被宽表格/长行撑出视口 */
    .portal-kp-detail__section-body .container {
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
    }

    .portal-kp-detail__section-body * {
        box-sizing: border-box;
        max-width: 100%;
    }

    /* 详细内容富文本区域在小屏下的自适应处理 */
    .portal-kp-detail__section-body img {
        max-width: 100%;
        height: auto;
        display: block;
        margin: 8px auto;
    }

    .portal-kp-detail__section-body table {
        width: 100%;
        max-width: 100%;
        table-layout: fixed;
        border-collapse: collapse;
        overflow-x: auto;
        display: block;
    }

    .portal-kp-detail__section-body td,
    .portal-kp-detail__section-body th {
        word-wrap: break-word;
        word-break: break-word;
    }
}

/* 知识点详情：窄屏手机（行业常见断点）单列排版、触控高度与信息可读性 */
@media (max-width: 640px) {
    .portal-home-card--kp-detail .portal-header-nav-row {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .portal-home-card--kp-detail .portal-breadcrumb__back {
        align-self: flex-start;
    }

    /* 面包屑允许换行，避免「人工智能训…」式截断 */
    .portal-home-card--kp-detail .portal-breadcrumb__trail {
        white-space: normal;
        overflow: visible;
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        row-gap: 4px;
        column-gap: 4px;
    }

    .portal-home-card--kp-detail .portal-breadcrumb__current {
        flex: 1 1 100%;
        min-width: 0;
        overflow: visible;
        text-overflow: unset;
        white-space: normal;
        word-break: break-word;
        line-height: 1.4;
    }

    .portal-home-card--kp-detail .portal-breadcrumb__crumb {
        white-space: normal;
        text-overflow: unset;
        overflow: visible;
        max-width: 100%;
    }

    .portal-home-card--kp-detail .portal-kp-detail__title-row {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
    }

    .portal-home-card--kp-detail .portal-kp-detail__title {
        font-size: clamp(16px, 4.2vw, 18px);
        line-height: 1.35;
        word-break: break-word;
    }

    .portal-home-card--kp-detail .portal-kp-detail__title-right {
        margin-left: 0;
        width: 100%;
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .portal-home-card--kp-detail .portal-kp-detail__tools-toggle {
        align-self: flex-end;
    }

    .portal-kp-detail__tools {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
        padding: 10px 12px;
    }

    .portal-kp-detail__meta {
        width: 100%;
        justify-content: flex-start;
    }

    .portal-kp-detail__view-nav {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        width: 100%;
    }

    .portal-kp-detail__view-tabs {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(148px, 1fr));
        gap: 8px;
        width: 100%;
    }

    .portal-kp-detail__view-tab {
        justify-content: center;
        min-height: 40px;
        padding: 8px 10px;
        font-size: 12px;
    }

    .portal-kp-detail__status-actions {
        display: flex;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 8px;
        width: 100%;
        margin-left: 0;
        align-items: stretch;
    }

    .portal-kp-detail__resource-btn {
        flex: 1 1 calc(50% - 4px);
        min-height: 40px;
        justify-content: center;
        display: inline-flex;
        align-items: center;
    }

    .portal-kp-detail__master-btn {
        flex: 1 1 auto;
        min-width: 0;
        min-height: 40px;
        font-size: 12px;
        padding: 8px 14px;
        font-weight: 600;
    }

    .portal-kp-detail__status-actions > *:only-child {
        flex: 1 1 100%;
    }
}

/* 循序学习（教学节点）与测验弹窗 */
.portal-kp-teaching {
    margin-bottom: 18px;
    min-width: 0;
    max-width: 100%;
}

.portal-kp-teaching__top {
    margin-bottom: 12px;
}

.portal-kp-teaching__status-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 8px;
}

.portal-kp-teaching__status-left {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.portal-kp-teaching__status-right {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
    flex-wrap: wrap;
}

/* 闯关说明：放在主内容区节点标题下，不占用吸顶条高度，避免遮挡左侧节点列表 */
.portal-kp-teaching__test-hint {
    margin: 0 0 10px;
    padding: 8px 10px;
    border-radius: 8px;
    font-size: 12px;
    line-height: 1.45;
    color: var(--um-text-secondary);
    background: color-mix(in srgb, var(--um-accent) 10%, var(--um-bg-secondary));
    border: 1px solid color-mix(in srgb, var(--um-accent) 22%, var(--um-border));
}

.portal-kp-teaching__stat {
    font-size: 12px;
    color: var(--um-text-secondary);
}

.portal-kp-teaching__progress {
    height: 8px;
    border-radius: 9999px;
    background: var(--um-bg-secondary);
    border: 1px solid var(--um-border);
    overflow: hidden;
}

.portal-kp-teaching__progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--um-accent), var(--um-accent-hover));
    width: 0%;
}

.portal-kp-teaching__layout {
    display: grid;
    /* minmax(0,1fr) 避免列被子元素最小内容宽度撑开导致小屏横向溢出 */
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 12px;
    align-items: start;
    min-width: 0;
}

.portal-kp-teaching__nav {
    position: sticky;
    top: 12px;
    align-self: start;
    border-radius: 12px;
    border: 1px solid var(--um-border);
    background: var(--um-bg-secondary);
    box-shadow: var(--um-shadow);
    padding: 10px;
}

.portal-kp-teaching__nav-title {
    font-size: 12px;
    color: var(--um-text-secondary);
    margin-bottom: 8px;
}

.portal-kp-teaching__nav-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-height: 62vh;
    overflow: auto;
    padding-right: 4px;
}

/* 未解锁节点：disabled 按钮不响应 hover，用外层承载 title 提示 */
.portal-kp-teaching__nav-item-wrap {
    display: block;
    width: 100%;
}

.portal-kp-teaching__nav-item-wrap--locked {
    cursor: not-allowed;
}

.portal-kp-teaching__nav-item-wrap--locked .portal-kp-teaching__nav-item {
    width: 100%;
    pointer-events: none;
}

.portal-kp-teaching__nav-item {
    text-align: left;
    border-radius: 12px;
    border: 1px solid transparent;
    background: transparent;
    color: var(--um-text-primary);
    padding: 8px 10px;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease, transform 0.08s ease;
}

.portal-kp-teaching__nav-item:hover {
    background: var(--um-bg-hover);
    border-color: var(--um-border);
    transform: translateY(-0.5px);
}

.portal-kp-teaching__nav-item.is-active {
    border-color: var(--um-accent);
    background: rgba(99, 102, 241, 0.10);
}

.portal-kp-teaching__nav-item.is-locked {
    opacity: 0.55;
    cursor: not-allowed;
}

.portal-kp-teaching__nav-item:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none;
}

.portal-kp-teaching__nav-item:disabled:hover {
    background: transparent;
    border-color: transparent;
    transform: none;
}

.portal-kp-teaching__nav-item.is-done .portal-kp-teaching__nav-item-meta {
    color: var(--um-accent);
}

.portal-kp-teaching__nav-item-title {
    display: block;
    font-size: 13px;
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 2px;
}

.portal-kp-teaching__nav-item-meta {
    display: block;
    font-size: 12px;
    color: var(--um-text-secondary);
}

.portal-kp-teaching__main {
    min-width: 0;
}

.portal-kp-teaching__qa {
    margin-top: 12px;
}

.portal-kp-teaching__qa-title {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 8px;
}

.portal-kp-teaching__qa-input {
    width: 100%;
    resize: vertical;
    min-height: 74px;
}

.portal-kp-teaching__qa-tools {
    margin-top: 8px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.portal-kp-teaching__qa-meta {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.portal-kp-teaching__qa-remain {
    font-size: 12px;
    color: var(--um-text-secondary);
}

.portal-kp-teaching__qa-count {
    font-size: 12px;
    color: var(--um-text-secondary);
}

.portal-kp-teaching__qa-answer {
    margin-top: 10px;
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid var(--um-border);
    background: var(--um-bg-secondary);
    font-size: 13px;
    line-height: 1.6;
    white-space: pre-wrap;
}

@media (max-width: 960px) {
    .portal-kp-teaching__layout {
        grid-template-columns: minmax(0, 1fr);
    }
    .portal-kp-teaching__nav {
        position: relative;
        top: auto;
    }
    .portal-kp-teaching__nav-list {
        max-height: 240px;
    }
}

.portal-kp-teaching__node-title {
    margin: 8px 0 10px;
    font-size: 15px;
    font-weight: 600;
}

.portal-teaching-msg--ok {
    color: var(--um-accent);
    font-weight: 500;
}

.portal-kp-teaching__hint {
    margin-top: 12px;
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid var(--um-border);
    background: var(--um-bg-secondary);
}

.portal-kp-teaching__hint-title {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
}

.portal-kp-teaching__hint-body {
    font-size: 13px;
    line-height: 1.6;
    white-space: pre-wrap;
}

.portal-teaching-modal {
    position: fixed;
    inset: 0;
    z-index: 12000;
    background: rgba(15, 23, 42, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    box-sizing: border-box;
}

.portal-teaching-modal__panel {
    width: 100%;
    max-width: 720px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.portal-teaching-modal__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 12px 14px;
    border-bottom: 1px solid var(--um-border);
}

.portal-teaching-modal__title {
    margin: 0;
    font-size: 16px;
}

.portal-teaching-modal__body {
    padding: 12px 14px;
    overflow-y: auto;
    flex: 1;
    min-height: 120px;
}

.portal-teaching-modal__ai {
    padding: 10px 14px;
    border-top: 1px solid var(--um-border);
    background: var(--um-bg-secondary);
}

.portal-teaching-modal__ai-title {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
}

.portal-teaching-modal__ai-body {
    font-size: 13px;
    line-height: 1.55;
    white-space: pre-wrap;
}

.portal-teaching-modal__footer {
    padding: 10px 14px;
    border-top: 1px solid var(--um-border);
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.portal-teaching-q {
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px dashed var(--um-border);
}

.portal-teaching-q__label {
    font-size: 12px;
    color: var(--um-text-secondary);
    margin-bottom: 6px;
}

.portal-teaching-q__stem {
    margin-bottom: 8px;
}

.portal-teaching-q__opt {
    display: flex;
    gap: 8px;
    align-items: flex-start;
    margin: 6px 0;
    cursor: pointer;
    font-size: 14px;
}

.portal-teaching-q__fib {
    margin: 8px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.portal-teaching-q__fib input.student-input {
    flex: 1;
    min-width: 0;
}