/* Learning follows the public documentation language: a concise introduction,
   a readable curriculum and one focused reading surface. */
body[data-theme-area="frontend"] .learning-page {
    --learning-reading-width: 740px;
    width: 100%;
    max-width: none;
    margin-inline: 0;
    padding-bottom: 48px;
    color: var(--ink);
}

body[data-theme-area="frontend"] :is(.learning-tracks-page, .learning-track-detail, .learning-room-page, .learning-progress-page) {
    width: 100%;
    max-width: none;
}

body[data-theme-area="frontend"] :is(.learning-page-heading, .learning-room-heading).page-head {
    width: 100%;
    max-width: none;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
}

body[data-theme-area="frontend"] .learning-row-meta,
body[data-theme-area="frontend"] .learning-heading-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 7px 12px;
    margin-top: 14px;
    color: var(--ink-muted);
    font-size: .84rem;
    line-height: 1.5;
}

body[data-theme-area="frontend"] .learning-row-meta span + span::before {
    content: '·';
    margin-right: 12px;
    color: var(--border-strong);
}

body[data-theme-area="frontend"] :is(.learning-heading-meta a, .learning-text-action, .learning-resource-links a, .learning-room-row-side a, .learning-task-pagination a) {
    color: var(--accent);
    font-weight: 600;
    text-decoration: none;
}

body[data-theme-area="frontend"] :is(.learning-heading-meta a, .learning-text-action, .learning-resource-links a, .learning-room-row-side a, .learning-task-pagination a):hover { text-decoration: underline; }

body[data-theme-area="frontend"] .learning-guest-note {
    max-width: 760px;
    margin: 12px 0 0;
    color: var(--ink-muted) !important;
    font-size: .875rem !important;
}

body[data-theme-area="frontend"] .learning-guest-note a { color: var(--accent); font-weight: 600; }

body[data-theme-area="frontend"] .learning-track-heading-aside {
    display: grid;
    flex: 0 1 360px;
    gap: 10px;
    min-width: 300px;
    margin-left: auto;
}

body[data-theme-area="frontend"] .learning-track-heading-aside .learning-row-meta {
    justify-content: flex-end;
    margin: 0;
}

body[data-theme-area="frontend"] .learning-track-heading-aside .learning-header-progress {
    max-width: none;
    margin-top: 0;
}

body[data-theme-area="frontend"] .learning-detail-heading:has(.learning-hero-cover) {
    flex-wrap: wrap;
}

body[data-theme-area="frontend"] .learning-detail-heading .learning-hero-cover {
    order: 5;
    flex: 0 0 min(520px, 100%);
}

/* Route archive */
body[data-theme-area="frontend"] .learning-filter {
    width: 100%;
    margin: 0 0 20px;
}

body[data-theme-area="frontend"] .learning-filter .archive-filter-grid { align-items: end; }

body[data-theme-area="frontend"] .learning-route-section-head {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 24px;
    margin: 0 0 14px;
}

body[data-theme-area="frontend"] .learning-route-section-head h2 {
    margin: 5px 0 0;
    color: var(--ink);
    font-size: 1.35rem;
    font-weight: 680;
    letter-spacing: -.016em;
}

body[data-theme-area="frontend"] .learning-route-section-head > span {
    color: var(--ink-muted);
    font-size: .84rem;
}

body[data-theme-area="frontend"] .learning-track-archive.package-archive {
    width: 100%;
    margin: 0;
    padding: 0 !important;
    border: 0 !important;
    border-radius: 0 !important;
    background: transparent !important;
    box-shadow: none !important;
}

body[data-theme-area="frontend"] .learning-track-row.package-line {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 232px;
    gap: 36px;
    align-items: stretch;
    margin: 0;
    padding: 32px 34px;
    overflow: hidden;
    border: 1px solid var(--border-strong);
    border-radius: 10px;
    background: var(--surface);
    box-shadow: 0 14px 34px color-mix(in srgb, var(--ink) 7%, transparent);
}

body[data-theme-area="frontend"] .learning-track-row.package-line::before {
    content: '';
    position: absolute;
    inset: 0 auto 0 0;
    width: 4px;
    background: var(--accent);
}

body[data-theme-area="frontend"] .learning-track-row.package-line:last-child { margin-bottom: 0; }

body[data-theme-area="frontend"] .learning-track-row:has(> .track-cover) { grid-template-columns: 144px minmax(0, 1fr) 210px; }

body[data-theme-area="frontend"] .track-cover {
    display: block;
    width: 144px;
    height: 96px;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 7px;
    background: var(--surface-alt);
}

body[data-theme-area="frontend"] .track-cover img { display: block; width: 100%; height: 100%; object-fit: cover; }
body[data-theme-area="frontend"] .learning-track-row .package-line-main { min-width: 0; max-width: 860px; }
body[data-theme-area="frontend"] .learning-track-row .package-facts { margin-top: 0; }

body[data-theme-area="frontend"] .learning-track-row .package-title {
    margin: 7px 0 0;
    color: var(--ink);
    font-size: 1.42rem;
    font-weight: 680;
    line-height: 1.4;
}

body[data-theme-area="frontend"] .learning-track-row .package-title a { color: inherit; text-decoration: none; }
body[data-theme-area="frontend"] .learning-track-row .package-title a:hover { color: var(--accent); }

body[data-theme-area="frontend"] .learning-track-row .package-summary {
    max-width: 720px;
    margin: 9px 0 0;
    color: var(--ink-muted);
    font-size: .93rem;
    line-height: 1.65;
}

body[data-theme-area="frontend"] .learning-room-names {
    position: relative;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    margin: 16px 0 0;
    padding: 0;
    color: var(--ink);
    font-size: .84rem;
    line-height: 1.5;
    list-style: none;
}

body[data-theme-area="frontend"] .learning-room-names::before {
    content: '';
    position: absolute;
    top: 12px;
    right: calc(16.666% - 1px);
    left: 12px;
    height: 1px;
    background: var(--border);
}

body[data-theme-area="frontend"] .learning-room-names li {
    position: relative;
    display: grid;
    gap: 6px;
    align-content: start;
    min-width: 0;
}

body[data-theme-area="frontend"] .learning-room-step-number {
    position: relative;
    z-index: 1;
    display: inline-flex;
    width: 25px;
    height: 25px;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--surface);
    color: var(--accent);
    font-size: .7rem;
    font-weight: 650;
    font-variant-numeric: tabular-nums;
}

body[data-theme-area="frontend"] .learning-track-row .package-line-aside {
    display: grid;
    width: 100%;
    gap: 13px;
    align-content: center;
    justify-items: stretch;
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface-alt);
    text-align: left;
}

body[data-theme-area="frontend"] .track-progress-line,
body[data-theme-area="frontend"] .learning-header-progress {
    display: grid;
    width: 100%;
    max-width: 620px;
    gap: 8px;
    margin-top: 16px;
}

body[data-theme-area="frontend"] :is(.track-progress-line, .learning-header-progress) > div {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    color: var(--ink-muted);
    font-size: .82rem;
}

body[data-theme-area="frontend"] :is(.track-progress-line, .learning-header-progress) strong {
    color: var(--ink);
    font-size: .86rem;
    font-variant-numeric: tabular-nums;
}

body[data-theme-area="frontend"] :is(progress.learning-progress, .learning-header-progress progress, .learning-room-progress progress) {
    display: block;
    width: 100%;
    height: 5px;
    margin: 0;
    overflow: hidden;
    border: 0;
    border-radius: 999px;
    background: var(--border);
}

body[data-theme-area="frontend"] progress::-webkit-progress-bar { background: var(--border); }
body[data-theme-area="frontend"] progress::-webkit-progress-value { background: var(--accent); }
body[data-theme-area="frontend"] progress::-moz-progress-bar { background: var(--accent); }

body[data-theme-area="frontend"] .learning-inline-cta {
    justify-self: stretch;
    justify-content: center;
    min-height: 36px;
    margin: 0;
    font-size: .875rem;
}

/* Route curriculum */
body[data-theme-area="frontend"] .learning-track-detail .learning-detail-heading > .learning-row-meta {
    flex: 0 1 auto;
    justify-content: flex-end;
    margin: 0 0 0 auto;
}

body[data-theme-area="frontend"] .learning-track-workspace {
    display: grid;
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
}

body[data-theme-area="frontend"] .learning-track-summary-panel {
    position: sticky;
    top: 20px;
    display: grid;
    gap: 16px;
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    box-shadow: 0 1px 2px color-mix(in srgb, var(--ink) 5%, transparent);
}

body[data-theme-area="frontend"] .learning-track-summary-score {
    display: flex;
    align-items: baseline;
    gap: 7px;
}

body[data-theme-area="frontend"] .learning-track-summary-score strong {
    color: var(--ink);
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
}

body[data-theme-area="frontend"] .learning-track-summary-score span,
body[data-theme-area="frontend"] .learning-track-summary-panel > p {
    color: var(--ink-muted);
    font-size: .82rem;
    line-height: 1.6;
}

body[data-theme-area="frontend"] .learning-track-summary-panel > p { margin: 0; }
body[data-theme-area="frontend"] .learning-track-summary-panel .btn { justify-content: center; }

body[data-theme-area="frontend"] .learning-hero-cover {
    width: min(100%, 520px);
    margin: 14px 0;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 7px;
    background: var(--surface-alt);
}

body[data-theme-area="frontend"] .learning-hero-cover img { display: block; width: 100%; max-height: 188px; object-fit: cover; }

body[data-theme-area="frontend"] .learning-room-list {
    display: block;
    width: 100%;
    margin: 0;
    padding: 24px 28px !important;
    border: 1px solid var(--border) !important;
    border-radius: 8px !important;
    background: var(--surface) !important;
    box-shadow: 0 1px 2px color-mix(in srgb, var(--ink) 5%, transparent) !important;
}

body[data-theme-area="frontend"] .learning-list-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 20px;
    padding: 0 0 18px;
    border-bottom: 1px solid var(--border);
}

body[data-theme-area="frontend"] .learning-list-heading h2 {
    margin: 0;
    color: var(--ink);
    font-size: 1.32rem;
    font-weight: 680;
}

body[data-theme-area="frontend"] .learning-list-heading p {
    margin: 0;
    color: var(--ink-muted);
    font-size: .82rem;
}

body[data-theme-area="frontend"] .learning-room-row {
    position: relative;
    display: grid;
    grid-template-columns: 48px minmax(0, 1fr) 112px;
    gap: 20px;
    align-items: center;
    padding: 26px 0;
    border-bottom: 1px solid var(--border);
}

body[data-theme-area="frontend"] .learning-room-row:last-child { border-bottom: 0; }

body[data-theme-area="frontend"] .learning-room-index {
    display: inline-flex;
    width: 38px;
    height: 38px;
    align-items: center;
    justify-content: center;
    border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--border));
    border-radius: 50%;
    background: color-mix(in srgb, var(--accent) 7%, var(--surface));
    color: var(--accent);
    font-size: .78rem;
    font-weight: 650;
    font-variant-numeric: tabular-nums;
}
body[data-theme-area="frontend"] .learning-room-row.is-complete .learning-room-index { color: var(--success, var(--accent)); }

body[data-theme-area="frontend"] .learning-room-row h2 {
    margin: 0;
    color: var(--ink);
    font-size: 1.12rem;
    font-weight: 650;
    line-height: 1.45;
}

body[data-theme-area="frontend"] .learning-room-row h2 a { color: inherit; text-decoration: none; }
body[data-theme-area="frontend"] .learning-room-row h2 a:hover { color: var(--accent); }

body[data-theme-area="frontend"] .learning-room-row p {
    margin: 6px 0 0;
    color: var(--ink-muted);
    font-size: .9rem;
    line-height: 1.62;
}

body[data-theme-area="frontend"] .learning-room-row-side {
    display: grid;
    gap: 5px;
    justify-items: end;
    color: var(--ink-muted);
    font-size: .82rem;
    text-align: right;
    white-space: nowrap;
}

/* Training room */
body[data-theme-area="frontend"] .learning-room-heading .learning-room-progress {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px 20px;
    align-items: end;
    flex: 0 1 340px;
    width: min(100%, 340px);
    max-width: 340px;
    margin: 0 0 0 auto;
}

body[data-theme-area="frontend"] .learning-room-progress .learning-row-meta { margin: 0; }

body[data-theme-area="frontend"] .learning-room-progress > strong {
    color: var(--ink);
    font-size: .84rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

body[data-theme-area="frontend"] .learning-room-progress progress { grid-column: 1 / -1; }

body[data-theme-area="frontend"] .learning-room-layout {
    display: grid;
    grid-template-columns: 240px minmax(0, 820px);
    gap: 32px;
    align-items: start;
    width: min(100%, 1092px);
    margin-inline: auto;
}

body[data-theme-area="frontend"] .learning-room-page .learning-guest-note {
    width: min(100%, 1092px);
    max-width: none;
    margin: 12px auto 0;
}

body[data-theme-area="frontend"] .learning-task-sidebar {
    position: sticky;
    top: 20px;
    padding: 18px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    box-shadow: none;
}

body[data-theme-area="frontend"] .learning-task-sidebar > p {
    margin: 0 8px 10px;
    color: var(--ink-muted);
    font-size: .76rem;
    font-weight: 650;
    letter-spacing: .02em;
}

body[data-theme-area="frontend"] .learning-task-nav { display: grid; }

body[data-theme-area="frontend"] :is(.learning-task-sidebar, .learning-task-menu) nav.learning-task-nav a {
    display: grid;
    grid-template-columns: 26px minmax(0, 1fr);
    gap: 8px;
    padding: 10px 8px;
    border: 0 !important;
    border-left: 2px solid transparent !important;
    border-radius: 0 !important;
    background: transparent;
    color: var(--ink-muted);
    font-size: .87rem;
    line-height: 1.45;
    text-decoration: none;
}

body[data-theme-area="frontend"] :is(.learning-task-sidebar, .learning-task-menu) nav.learning-task-nav a:hover { color: var(--ink); }

body[data-theme-area="frontend"] :is(.learning-task-sidebar, .learning-task-menu) nav.learning-task-nav a.is-active {
    border-left-color: var(--accent) !important;
    color: var(--ink);
    font-weight: 620;
}

body[data-theme-area="frontend"] .learning-task-nav-index { color: var(--ink-muted); font-size: .76rem; font-variant-numeric: tabular-nums; }
body[data-theme-area="frontend"] .learning-task-nav-title { min-width: 0; }

body[data-theme-area="frontend"] .learning-reading-column {
    min-width: 0;
    padding: clamp(28px, 3vw, 36px);
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    box-shadow: 0 1px 2px color-mix(in srgb, var(--ink) 5%, transparent);
}

body[data-theme-area="frontend"] .learning-room-intro {
    max-width: var(--learning-reading-width);
    margin: 0 auto 28px;
    padding: 0 0 28px;
    border-bottom: 1px solid var(--border);
    color: var(--ink);
    line-height: 1.8;
}

body[data-theme-area="frontend"] :is(.learning-room-intro, .learning-task-content) > :first-child { margin-top: 0; }
body[data-theme-area="frontend"] :is(.learning-room-intro, .learning-task-content) > :last-child { margin-bottom: 0; }
body[data-theme-area="frontend"] .learning-task-reading header {
    max-width: var(--learning-reading-width);
    margin-inline: auto;
}

body[data-theme-area="frontend"] .learning-task-reading header > div {
    display: flex;
    gap: 8px;
    align-items: baseline;
    color: var(--ink-muted);
    font-size: .82rem;
}

body[data-theme-area="frontend"] .learning-task-reading header > div span + span::before { content: '·'; margin-right: 8px; }

body[data-theme-area="frontend"] .learning-task-reading h2 {
    margin: 8px 0 0;
    color: var(--ink);
    font-size: clamp(1.55rem, 2.2vw, 1.8rem);
    font-weight: 670;
    letter-spacing: -.018em;
    line-height: 1.32;
}

body[data-theme-area="frontend"] .learning-task-reading h2 a { color: inherit; text-decoration: none; }

body[data-theme-area="frontend"] .learning-task-content {
    max-width: var(--learning-reading-width);
    margin: 24px auto 0;
    color: var(--ink);
    font-size: 1rem;
    line-height: 1.82;
}

body[data-theme-area="frontend"] :is(.learning-task-content, .learning-room-intro) :is(p, li) { color: var(--ink); }
body[data-theme-area="frontend"] .learning-task-content :is(h1, h2, h3, h4) { color: var(--ink); line-height: 1.36; }
body[data-theme-area="frontend"] .learning-task-content h2 { font-size: 1.32rem; }
body[data-theme-area="frontend"] .learning-task-content h3 { font-size: 1.1rem; }

body[data-theme-area="frontend"] .learning-task-content blockquote {
    margin: 20px 0;
    padding-left: 16px;
    border-left: 2px solid var(--border-strong);
    color: var(--ink-muted);
}

body[data-theme-area="frontend"] .learning-task-content pre {
    max-width: 100%;
    padding: 16px;
    overflow: auto;
    border: 1px solid var(--border);
    border-radius: 7px;
    background: var(--surface-sunken, var(--surface-alt));
}

body[data-theme-area="frontend"] .learning-task-content table { width: 100%; border-collapse: collapse; }
body[data-theme-area="frontend"] .learning-task-content :is(th, td) { padding: 8px 12px; border: 1px solid var(--border); text-align: left; }
body[data-theme-area="frontend"] .learning-task-content img { max-width: 100%; height: auto; }

body[data-theme-area="frontend"] .learning-resource-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 20px;
    max-width: var(--learning-reading-width);
    margin: 20px auto 0;
    font-size: .88rem;
}

body[data-theme-area="frontend"] .learning-checkpoint {
    max-width: var(--learning-reading-width);
    margin: 38px auto 0;
    padding: 24px;
    border: 0;
    border-radius: 8px;
    background: var(--surface-alt);
}

body[data-theme-area="frontend"] .learning-checkpoint header { display: grid; gap: 6px; }
body[data-theme-area="frontend"] .learning-checkpoint-kind { color: var(--ink-muted); font-size: .8rem; }

body[data-theme-area="frontend"] .learning-checkpoint h3 {
    margin: 0;
    color: var(--ink);
    font-size: 1.08rem;
    font-weight: 650;
    line-height: 1.45;
}

body[data-theme-area="frontend"] .learning-checkpoint > .prose-content {
    max-width: 680px;
    margin-top: 14px;
    color: var(--ink);
    line-height: 1.72;
}

body[data-theme-area="frontend"] .learning-checkpoint > .prose-content p { color: var(--ink); }

body[data-theme-area="frontend"] .learning-answer-form { display: grid; gap: 10px; margin-top: 18px; }
body[data-theme-area="frontend"] .learning-answer-form .form-control { width: 100%; max-width: 640px; }
body[data-theme-area="frontend"] .learning-answer-form .btn { justify-self: start; }

body[data-theme-area="frontend"] .learning-option {
    display: flex;
    gap: 11px;
    align-items: flex-start;
    max-width: 660px;
    padding: 11px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--surface);
    color: var(--ink);
    cursor: pointer;
}

body[data-theme-area="frontend"] .learning-option input { flex: 0 0 auto; margin-top: .3rem; }
body[data-theme-area="frontend"] .learning-option .prose-content > * { margin: 0; }

body[data-theme-area="frontend"] .learning-answer-status { display: flex; gap: 8px; align-items: baseline; margin-top: 14px; font-size: .88rem; }
body[data-theme-area="frontend"] .learning-answer-status span { color: var(--ink-muted); }
body[data-theme-area="frontend"] .learning-answer-status.is-success { color: var(--success, var(--accent)); }
body[data-theme-area="frontend"] :is(.learning-answer-status.is-warning, .learning-answer-status.is-danger) { color: var(--warning, var(--accent)); }
body[data-theme-area="frontend"] [data-question-state] { display: none; }
body[data-theme-area="frontend"] [data-question-state].is-solved { display: block; margin-top: 10px; color: var(--success, var(--accent)); font-size: .82rem; }

body[data-theme-area="frontend"] .learning-hint { max-width: 680px; margin-top: 16px; color: var(--ink); font-size: .88rem; }
body[data-theme-area="frontend"] .learning-hint summary { color: var(--ink); font-weight: 600; cursor: pointer; }

body[data-theme-area="frontend"] .learning-hint-item {
    margin-top: 14px;
    padding-left: 12px;
    border-left: 2px solid var(--border-strong);
    color: var(--ink);
}

body[data-theme-area="frontend"] .learning-hint-item + .learning-hint-item { padding-top: 14px; border-top: 1px solid var(--border); }
body[data-theme-area="frontend"] .learning-hint-item > strong { display: block; margin-bottom: 6px; }
body[data-theme-area="frontend"] .learning-hint-item :is(div, p) { margin: 6px 0 0; color: var(--ink); }
body[data-theme-area="frontend"] .learning-hint form { margin-top: 10px; }
body[data-theme-area="frontend"] .learning-hint form .learning-text-action { padding: 0; border: 0; background: transparent; cursor: pointer; font: inherit; }

body[data-theme-area="frontend"] .learning-task-complete {
    max-width: var(--learning-reading-width);
    margin: 30px auto 0;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

body[data-theme-area="frontend"] .learning-task-pagination {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    max-width: var(--learning-reading-width);
    margin: 36px auto 0;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    font-size: .88rem;
}

body[data-theme-area="frontend"] .learning-task-pagination span { min-height: 1px; }

body[data-theme-area="frontend"] .learning-task-menu {
    display: none;
    margin: 0 0 16px;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 7px;
    background: var(--surface);
}

body[data-theme-area="frontend"] .learning-task-menu summary { color: var(--ink); font-weight: 600; cursor: pointer; }
body[data-theme-area="frontend"] .learning-task-menu .learning-task-nav { margin-top: 10px; }

/* Progress records */
body[data-theme-area="frontend"] :is(.learning-timeline-list, .learning-history-note) {
    padding: 20px 24px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    box-shadow: 0 1px 2px color-mix(in srgb, var(--ink) 5%, transparent);
}

body[data-theme-area="frontend"] .learning-timeline-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
}

body[data-theme-area="frontend"] .learning-timeline-row:last-child { border-bottom: 0; }
body[data-theme-area="frontend"] .learning-timeline-row h2 { margin: 0; color: var(--ink); font-size: .98rem; }
body[data-theme-area="frontend"] .learning-timeline-row :is(p, time) { margin: 4px 0 0; color: var(--ink-muted); font-size: .84rem; }
body[data-theme-area="frontend"] .learning-timeline-row time { white-space: nowrap; }

body[data-theme-area="frontend"] .learning-history-note { margin-top: 22px; color: var(--ink); font-size: .88rem; }
body[data-theme-area="frontend"] .learning-history-note h2 { margin: 0; color: var(--ink); font-size: .98rem; }
body[data-theme-area="frontend"] .learning-history-note p { margin: 6px 0 14px; color: var(--ink-muted); }
body[data-theme-area="frontend"] .learning-history-note > div { padding: 11px 0; border-top: 1px solid var(--border); }
body[data-theme-area="frontend"] .learning-history-note span { float: right; color: var(--ink-muted); }

body[data-theme-area="frontend"] :is(.track-cover, .learning-track-row a, .learning-room-row a, .learning-task-nav a, .learning-option, .learning-hint summary):focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

body[data-theme-area="frontend"] :is(.learning-inline-cta, .learning-answer-form .btn, .learning-task-complete .btn):active { transform: scale(.98); }

@media (hover: hover) and (pointer: fine) {
    body[data-theme-area="frontend"] .learning-track-row .package-title a,
    body[data-theme-area="frontend"] .learning-room-row h2 a { transition: color 160ms ease; }
}

@media (max-width: 991.98px) {
    body[data-theme-area="frontend"] :is(.learning-page-heading, .learning-room-heading).page-head {
        flex-wrap: wrap;
    }

    body[data-theme-area="frontend"] .learning-track-heading-aside,
    body[data-theme-area="frontend"] .learning-room-heading .learning-room-progress {
        flex: 1 0 100%;
        width: 100%;
        max-width: 620px;
        min-width: 0;
        margin-left: 0;
    }

    body[data-theme-area="frontend"] .learning-track-heading-aside .learning-row-meta {
        justify-content: flex-start;
    }

    body[data-theme-area="frontend"] .learning-track-workspace {
        grid-template-columns: 230px minmax(0, 1fr);
    }

    body[data-theme-area="frontend"] .learning-track-row.package-line,
    body[data-theme-area="frontend"] .learning-track-row:has(> .track-cover) { grid-template-columns: minmax(0, 1fr) 190px; }

    body[data-theme-area="frontend"] .learning-track-row:has(> .track-cover) .track-cover { grid-column: 1 / -1; }
    body[data-theme-area="frontend"] .learning-room-layout { grid-template-columns: 1fr; gap: 16px; }
    body[data-theme-area="frontend"] .learning-task-sidebar { display: none; }
    body[data-theme-area="frontend"] .learning-task-menu { display: block; }
    body[data-theme-area="frontend"] .learning-reading-column { max-width: 820px; }
}

@media (max-width: 575.98px) {
    body[data-theme-area="frontend"] .learning-page { padding-bottom: 32px; }

    body[data-theme-area="frontend"] :is(.learning-page-heading, .learning-room-heading).page-head {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
        margin-bottom: 20px;
        padding: 20px 0 16px;
    }

    body[data-theme-area="frontend"] .learning-filter { margin-bottom: 14px; }

    body[data-theme-area="frontend"] .learning-route-section-head {
        align-items: flex-start;
        flex-direction: column;
        gap: 6px;
    }

    body[data-theme-area="frontend"] .learning-track-row.package-line,
    body[data-theme-area="frontend"] .learning-track-row:has(> .track-cover) {
        grid-template-columns: 1fr;
        gap: 15px;
        padding: 20px;
    }

    body[data-theme-area="frontend"] .learning-track-row:has(> .track-cover) .track-cover { grid-column: auto; }
    body[data-theme-area="frontend"] .track-cover { width: 100%; height: auto; aspect-ratio: 16 / 8; }

    body[data-theme-area="frontend"] .learning-room-names {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    body[data-theme-area="frontend"] .learning-room-names::before {
        top: 12px;
        bottom: 12px;
        left: 12px;
        width: 1px;
        height: auto;
    }

    body[data-theme-area="frontend"] .learning-room-names li {
        grid-template-columns: 25px minmax(0, 1fr);
        gap: 10px;
        align-items: center;
    }

    body[data-theme-area="frontend"] .learning-track-row .package-line-aside {
        padding: 15px 0 0;
        border: 0;
        border-top: 1px solid var(--border);
        border-radius: 0;
        background: transparent;
    }

    body[data-theme-area="frontend"] .learning-track-detail .learning-detail-heading > .learning-row-meta {
        justify-content: flex-start;
        margin-left: 0;
    }

    body[data-theme-area="frontend"] .learning-track-workspace { grid-template-columns: 1fr; gap: 16px; }
    body[data-theme-area="frontend"] .learning-track-summary-panel { position: static; padding: 20px; }
    body[data-theme-area="frontend"] .learning-room-list { padding: 20px !important; }

    body[data-theme-area="frontend"] .learning-list-heading {
        align-items: flex-start;
        flex-direction: column;
        gap: 6px;
        padding: 0 0 14px;
        border-bottom: 1px solid var(--border);
    }

    body[data-theme-area="frontend"] .learning-room-row {
        grid-template-columns: 38px minmax(0, 1fr);
        gap: 12px;
        padding: 19px 0;
    }

    body[data-theme-area="frontend"] .learning-room-row-side {
        grid-column: 2;
        display: flex;
        justify-content: space-between;
        text-align: left;
    }

    body[data-theme-area="frontend"] .learning-room-heading .learning-room-progress { grid-template-columns: 1fr; }
    body[data-theme-area="frontend"] .learning-room-progress progress { grid-row: 3; }
    body[data-theme-area="frontend"] .learning-reading-column { padding: 20px 18px; }
    body[data-theme-area="frontend"] .learning-task-reading h2 { font-size: 1.5rem; }
    body[data-theme-area="frontend"] .learning-checkpoint { margin-top: 30px; padding: 18px; }
    body[data-theme-area="frontend"] .learning-answer-form .form-control { max-width: none; }
    body[data-theme-area="frontend"] .learning-task-pagination { margin-top: 30px; font-size: .84rem; }
    body[data-theme-area="frontend"] .learning-timeline-row { grid-template-columns: 1fr; }
    body[data-theme-area="frontend"] .learning-timeline-row time { white-space: normal; }
    body[data-theme-area="frontend"] .learning-history-note span { display: block; float: none; margin-top: 4px; }
}

@media (prefers-reduced-motion: reduce) {
    body[data-theme-area="frontend"] .learning-track-row a,
    body[data-theme-area="frontend"] .learning-room-row a { transition-duration: .01ms; }
}