:root {
  --site-ink: #354552;
  --site-heading: #476675;
  --site-muted: #60727c;
  --site-accent: #fb8f68;
  --site-accent-ink: #9a4325;
  --site-accent-tint: #fdf0ea;
  --site-paper: #fafafa;
  --site-surface: #ffffff;
  --site-tint: #edf2f4;
  --site-line: #dbe3e7;
  --site-focus: #315d73;
  --site-scrollbar: #8b9fa9;
  --site-scrollbar-hover: #607b88;
  --site-font-body: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --site-font-serif: "Songti SC", "STSong", "Source Han Serif SC", "Noto Serif CJK SC", "SimSun", serif;
  --site-ai-soft: #8eaab7;
  --site-grid: #e6ecef;
}

.library-page, .library-page * { box-sizing: border-box; }
.library-page {
  margin: 0;
  color: var(--site-ink);
  background: var(--site-paper);
  font: 16px/1.75 var(--site-font-body);
  -webkit-font-smoothing: antialiased;
}
/* Links are underlined in the line colour and at least 44px tall; on hover the text turns accent and the
   underline follows it. :where() keeps these defaults at element specificity, so a single class overrides them. */
:where(.library-page) a, .library-bar a { display: inline-flex; align-items: center; min-height: 44px; color: inherit; }
:where(.library-page) a { text-decoration: underline; text-decoration-color: var(--site-line); text-underline-offset: 5px; }
.library-bar a { text-decoration: none; }
:where(.library-page) a, .library-page button, .library-bar a { cursor: pointer; }
.library-page a:focus-visible, .library-page button:focus-visible, .library-bar a:focus-visible {
  outline: 3px solid var(--site-focus);
  outline-offset: 5px;
}
:where(.library-page) a:hover, .library-bar a:hover { color: var(--site-accent-ink); text-decoration-color: currentColor; }
.library-page a:active, .library-page button:active, .library-bar a:active { opacity: .75; }
/* Links inside running text stay inline. */
:where(.changelog-day li, .video-sources, .outline-content, .session-bubble, .session-detail) a { display: inline; }
/* These underline in the text colour. */
.library-heading > a, .changelog-day li a, .outline-nav a, .outline-content a, .poster-actions a, .poster-neighbours a, .poster-gallery-footer a, .poster-history-link { text-decoration-color: currentColor; }
/* Cards and pictures that are links carry no underline. */
.sessions-card, .poster-preview, .poster-detail-image { text-decoration: none; }
.library-page :disabled { cursor: wait; }
.library-page ::selection { background: var(--site-accent); color: var(--site-ink); }
.library-page { scrollbar-color: var(--site-scrollbar) var(--site-paper); scrollbar-width: auto; }
.library-page * { scrollbar-color: var(--site-scrollbar) var(--site-paper); }
.library-page::-webkit-scrollbar, .library-page ::-webkit-scrollbar { width: 12px; height: 12px; }
.library-page::-webkit-scrollbar-track, .library-page ::-webkit-scrollbar-track { background: var(--site-paper); }
.library-page::-webkit-scrollbar-thumb, .library-page ::-webkit-scrollbar-thumb {
  background: var(--site-scrollbar); border: 3px solid var(--site-paper); border-radius: 12px;
}
.library-page::-webkit-scrollbar-thumb:hover, .library-page ::-webkit-scrollbar-thumb:hover { background: var(--site-scrollbar-hover); }
.library-page::-webkit-scrollbar-thumb:active, .library-page ::-webkit-scrollbar-thumb:active { background: var(--site-heading); }
.library-wrap { width: min(640px, calc(100% - 48px)); margin: 64px auto; }
.library-wrap h1, .video-heading h1, .sessions-heading h1, .session-title { margin: 0; color: var(--site-heading); font-size: 22px; font-weight: 600; line-height: 1.4; }
.library-section { display: grid; grid-template-columns: 112px minmax(0, 1fr); column-gap: 28px; margin-bottom: 28px; }
.library-section h2 { margin: 0; padding-top: 11px; color: var(--site-muted); font-size: 13px; font-weight: 400; }
.library-section ul { list-style: none; margin: 0; padding: 0; }
.library-heading { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 40px; color: var(--site-muted); }
.library-heading > a { font-size: 12px; }
.library-comments { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--site-line); }
.library-comments h2 { margin: 0; font-size: 18px; font-weight: 600; color: var(--site-heading); }
.library-comments > p { margin: 8px 0 16px; font-size: 14px; color: var(--site-muted); }
.library-comments [data-comments-retry] { padding: 8px 12px; border: 1px solid var(--site-line); background: var(--site-surface); color: var(--site-ink); font: inherit; cursor: pointer; }
.library-comments [data-comments-retry]:hover { background: var(--site-tint); }
.library-comments #course-comments { min-height: 220px; }
.library-comments #course-comments .twikoo { color: var(--site-ink); }
.library-comments #course-comments .tk-meta-input, .library-comments #course-comments .tk-submit > .tk-row > .tk-avatar { display: none; }
.comment-persona:not([hidden]) { display: flex; gap: 12px; align-items: center; margin: 16px 0 12px; font-size: 14px; color: var(--site-heading); }
.comment-persona img { flex: none; border-radius: 6px; }
.library-comments #course-comments .tk-avatar { flex: none; width: 36px; height: 36px; }
.library-comments #course-comments .tk-avatar img { width: 36px; height: 36px; border-radius: 6px; }
.library-comments #course-comments .tk-submit { margin-top: 0; }
.library-comments #course-comments .tk-submit .tk-col { margin-left: 0; }
.library-comments #course-comments .tk-input__inner, .library-comments #course-comments .tk-textarea__inner { font-family: var(--site-font-body); color: var(--site-ink); background: var(--site-surface); border-color: var(--site-line); }
.library-comments #course-comments .tk-textarea__inner { min-height: 144px; padding: 12px; font-size: 14px; line-height: 24px; resize: none; }
.library-comments #course-comments .tk-input__inner:focus, .library-comments #course-comments .tk-textarea__inner:focus { outline: 2px solid var(--site-focus); outline-offset: 2px; }
.library-comments #course-comments .tk-preview, .library-comments #course-comments .tk-submit .__markdown { display: none; }
.library-comments #course-comments .tk-button--primary { background: var(--site-heading); border-color: var(--site-heading); }
.library-comments #course-comments .tk-button--primary:hover:not(:disabled) { background: var(--site-focus); border-color: var(--site-focus); }
.library-comments #course-comments .tk-nick { color: var(--site-heading); }
.library-comments #course-comments .tk-comment { margin-top: 24px; overflow-wrap: anywhere; }
.library-comments #course-comments .tk-comment > .tk-avatar { margin: 4px 12px 0 0; }
.library-comments #course-comments .tk-main > .tk-row { align-items: center; flex-wrap: wrap; column-gap: 12px; }
.library-comments #course-comments .tk-meta { align-items: center; min-height: 36px; font-size: 14px; line-height: 24px; }
.library-comments #course-comments .tk-content { margin-top: 4px; line-height: 28px; }
.library-comments #course-comments .tk-content p { margin: 0; }
.library-comments #course-comments .tk-content p + p { margin-top: 8px; }
.library-comments #course-comments .tk-input__count { right: 12px; bottom: 8px; }
.library-comments #course-comments [role="button"]:focus-visible { outline: 2px solid var(--site-focus); outline-offset: 4px; }
.library-comments #course-comments .tk-comment img { max-width: 100%; height: auto; }
/* Keep the embedded controls in the site's quiet text-and-line vocabulary. */
.library-comments #course-comments .twikoo { font-family: var(--site-font-body); }
.library-comments #course-comments .tk-comments-title { margin: 24px 0 0; line-height: 24px; color: var(--site-heading); font-size: 15px; font-weight: 500; }
.library-comments #course-comments .tk-comments-count { font-size: inherit; font-weight: inherit; }
.library-comments #course-comments .tk-action { display: flex; flex-wrap: wrap; gap: 0 12px; }
.library-comments #course-comments .tk-action-link,
.library-comments #course-comments .tk-submit-action-icon { display: inline-flex; align-items: center; gap: 5px; min-height: 44px; width: auto; color: var(--site-muted); font: inherit; font-size: 13px; }
.library-comments #course-comments [data-action-label]::after { content: attr(data-action-label); white-space: nowrap; }
.library-comments #course-comments .tk-submit .tk-row.actions { margin-left: 0; margin-block: 8px 0; }
.library-comments #course-comments .tk-comments-actions > .tk-icon.__comments { color: var(--site-muted); width: 32px; height: 44px; padding: 9px; }
.library-comments #course-comments .tk-comments-actions > .tk-icon.__active { color: var(--site-surface); background: var(--site-heading); box-shadow: none; }
.library-comments #course-comments .tk-action-icon { color: inherit; }
.library-comments #course-comments .tk-action-link { margin-left: 0; }
.library-comments #course-comments .tk-action-link:hover,
.library-comments #course-comments .tk-submit-action-icon:hover { color: var(--site-heading); }
.library-comments #course-comments .tk-submit-action-icon .tk-icon { width: 16px; height: 16px; }
.library-comments #course-comments .tk-time,
.library-comments #course-comments .tk-footer { color: var(--site-muted); }
.library-comments #course-comments .tk-footer { font-size: 12px; }
.library-comments #course-comments .tk-textarea__inner::placeholder { color: var(--site-muted); font-size: 14px; opacity: 1; }

/* The back link takes a row of its own. As a block, its bottom margin collapses into the next heading's top
   margin, so each page keeps its own gap. */
.library-back { display: flex; width: fit-content; margin-bottom: 24px; font-size: 14px; }
.changelog-wrap { margin-top: 32px; }
.changelog-day h2 { font-variant-numeric: tabular-nums; }
.changelog-day li { padding-block: 8px; }
.library-row { display: grid; grid-template-columns: minmax(0, 1fr) 80px; gap: 16px; align-items: baseline; }
.library-entry { position: relative; min-width: 0; justify-self: start; }
.library-entry a { padding-block: 8px; }
.library-date { color: var(--site-muted); font-size: 12px; white-space: nowrap; text-align: right; font-variant-numeric: tabular-nums; }
.library-status { margin-left: 8px; color: var(--site-accent-ink); font-size: 11px; white-space: nowrap; }
.library-sessions { margin-left: 12px; color: var(--site-muted); font-size: 12px; white-space: nowrap; }
.library-tooltip { display: none; position: absolute; z-index: 10; top: 100%; left: 0; width: 300px; max-width: calc(100vw - 48px); padding: 12px 16px; color: var(--site-ink); background: var(--site-surface); border: 1px solid var(--site-line); border-radius: 6px; box-shadow: 0 6px 20px #35455214; font-size: 13px; line-height: 1.8; }
.library-tooltip p { margin: 0; }
.library-tooltip p + p { margin-top: 8px; color: var(--site-muted); }
.library-entry:not([data-dismissed]):focus-within .library-tooltip { display: block; }
@media (hover: hover) {
  .library-entry:not([data-dismissed]):hover .library-tooltip { display: block; }
}
.library-intro { display: none; }
@media (max-width: 540px), (hover: none) {
  .library-intro { display: block; position: fixed; z-index: 10000; top: 8px; left: 12px; right: 12px; box-sizing: border-box; padding: 12px 44px 12px 16px; border: 1px solid var(--site-line); border-radius: 6px; background: var(--site-surface); color: var(--site-ink); box-shadow: 0 4px 16px #35455214; font: 13px/1.7 var(--site-font-body); }
  .library-intro p { margin: 0; }
  .library-intro p + p { margin-top: 6px; }
  .library-intro button { position: absolute; right: 0; top: 0; width: 44px; height: 44px; padding: 0; border: 0; background: transparent; color: inherit; font: 22px var(--site-font-body); cursor: pointer; }
  .library-intro button:focus-visible { outline: 3px solid var(--site-focus); }
  .library-intro[hidden] { display: none; }
}
.library-skip { position: absolute; top: -100px; left: 20px; z-index: 10; background: var(--site-surface); padding: 12px; }
.library-skip:focus { top: 12px; }
.library-bar { width: min(1320px, calc(100% - 36px)); margin: 14px auto; display: flex; gap: 20px; align-items: center; font: 14px/1.6 var(--site-font-body); color: var(--site-ink); }
.library-bar a:last-child { margin-left: auto; }
.library-bar { flex-wrap: wrap; }
@media (max-width: 540px) {
  .library-section { grid-template-columns: 1fr; }
  .library-section h2 { padding-top: 0; margin-bottom: 6px; }
  .library-wrap { margin-block: 36px; }
}
@media (prefers-reduced-motion: reduce) {
  .library-page *, .library-bar * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}
@media (forced-colors: active) {
  .library-page, .library-page * { scrollbar-color: auto; }
  .library-page a:focus-visible, .library-page button:focus-visible { outline-color: Highlight; }
}

.video-wrap { width: min(960px, calc(100% - 48px)); margin: 32px auto 64px; }
.video-heading h1 { line-height: 1.5; }
.video-heading p:last-child { max-width: 640px; margin: 8px 0 0; }
.video-player { display: block; box-sizing: border-box; width: 100%; aspect-ratio: 16 / 9; margin: 24px 0 16px; border: 1px solid var(--site-line); border-radius: 6px; background: var(--site-tint); }
.video-notes { max-width: 640px; color: var(--site-muted); font-size: 13px; line-height: 1.8; }
.video-notes p { margin: 0; }
.video-notes p + p { margin-top: 6px; }
.video-downloads { display: flex; flex-wrap: wrap; gap: 0 24px; margin-top: 8px; font-size: 14px; }
.video-sources { max-width: 640px; margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--site-line); font-size: 14px; }
.video-sources h2 { margin: 0; color: var(--site-heading); font-size: 16px; font-weight: 600; }
.video-sources > p { margin: 6px 0 12px; color: var(--site-muted); font-size: 13px; }
.video-sources ol { margin: 0; padding-left: 1.6em; }
.video-sources li { padding-block: 6px; }
.video-sources li span { margin-left: 8px; color: var(--site-muted); font-size: 12px; }
@media (orientation: portrait) {
  /* site.js switches to the portrait cut under the same condition. */
  .video-player { aspect-ratio: 9 / 16; width: min(100%, calc((100vh - 64px) * 9 / 16)); width: min(100%, calc((100svh - 64px) * 9 / 16)); margin-inline: auto; }
}

.outline-wrap { width: min(840px, calc(100% - 48px)); margin: 32px auto 64px; }
.outline-wrap h1, .outline-wrap h2, .outline-wrap h3 { color: var(--site-heading); line-height: 1.5; }
.outline-wrap h1 { margin: 24px 0 8px; font-size: 28px; font-weight: 600; }
.outline-date { margin-top: 0; color: var(--site-muted); font-size: 13px; }
.outline-nav { display: flex; flex-wrap: wrap; gap: 0 24px; margin: 24px 0 36px; padding-block: 12px; border-block: 1px solid var(--site-line); font-size: 14px; }
.outline-content { overflow-wrap: anywhere; }
.outline-content h2 { margin: 48px 0 20px; font-size: 22px; scroll-margin-top: 24px; }
.outline-content h3 { margin: 36px 0 16px; font-size: 19px; scroll-margin-top: 24px; }
.outline-content p, .outline-content li { max-width: 44em; }
.outline-content p { margin: 16px 0; }
.outline-content li + li { margin-top: 8px; }
.outline-content img { display: block; width: 100%; height: auto; aspect-ratio: auto; }
.outline-table { overflow-x: auto; margin-block: 24px; }
.outline-scroll-hint { display: none; }
@media (max-width: 727px) {
  .outline-scroll-hint { display: block; position: sticky; left: 0; width: fit-content; margin-bottom: 8px; color: var(--site-muted); font-size: 12px; }
}
.outline-table:focus-visible { outline: 3px solid var(--site-focus); outline-offset: 4px; }
.outline-table table { width: 100%; min-width: 680px; border-collapse: collapse; font-size: 14px; }
.outline-table th, .outline-table td { padding: 12px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--site-line); }
.outline-table th { color: var(--site-heading); font-weight: 600; }
.outline-table td:first-child { width: 52px; }
.outline-table td:nth-child(2) { width: 180px; }
.outline-table td:nth-child(4) { width: 160px; }
.outline-table a { display: inline-block; min-height: 0; padding-block: 8px; }
.outline-lesson-table table { table-layout: fixed; }
.outline-lesson-table caption { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.outline-lesson-table .outline-chapter-column { width: 22%; }
.outline-lesson-table .outline-section-column { width: 30%; }
.outline-lesson-table td:nth-child(n) { width: auto; }
.outline-lesson-table thead th { border-bottom: 2px solid var(--site-line); }
.outline-lesson-table tbody + tbody tr:first-child > * { border-top: 2px solid var(--site-line); }
.outline-lesson-table th[scope="rowgroup"] { color: var(--site-ink); padding-right: 20px; }
.outline-lesson-table th[scope="row"] { font-weight: 400; }
@media (max-width: 540px) {
  .outline-wrap { width: calc(100% - 32px); margin-top: 16px; }
  .outline-wrap h1 { font-size: 24px; }
  .outline-content ul, .outline-content ol { padding-left: 24px; }
}
@media print {
  .outline-wrap .library-back, .outline-nav, .outline-date { display: none; }
  .outline-wrap { width: 100%; margin: 0; }
  .outline-table { overflow: visible; }
  .outline-table table { min-width: 0; }
}

/* Poster archive: a quiet comparison surface; the artwork carries the colour. */
.poster-gallery { width: min(1320px, calc(100% - 64px)); margin: 24px auto 64px; }
.poster-gallery-heading { display: flex; justify-content: space-between; align-items: end; gap: 32px; margin: 32px 0; }
.poster-eyebrow { margin: 0 0 12px; font-size: 13px; color: var(--site-muted); }
.poster-gallery h1 { margin: 0 0 14px; color: var(--site-ink); font-size: clamp(30px, 4vw, 48px); font-weight: 600; line-height: 1.3; letter-spacing: -.04em; }
.poster-gallery-heading p:last-child { margin-bottom: 0; }
.poster-collection-note { flex: none; text-align: right; color: var(--site-muted); font: 14px/1.8 "Helvetica Neue", var(--site-font-body); }
.poster-section-nav { display: flex; gap: 12px 30px; flex-wrap: wrap; padding: 14px 0; border-block: 1px solid var(--site-line); }
.poster-section-nav a { gap: 8px; }
.poster-section-nav span { font-size: 12px; color: var(--site-muted); font-variant-numeric: tabular-nums; }
.poster-group { margin-top: 56px; scroll-margin-top: 24px; }
.poster-group-heading { margin-bottom: 24px; }
.poster-group-heading h2 { margin: 0 0 6px; font-size: 23px; font-weight: 600; color: var(--site-heading); }
.poster-group-heading p { margin: 0; color: var(--site-muted); font-size: 14px; }
.poster-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px 24px; }
.poster-grid-featured { display: block; }
.poster-card { min-width: 0; scroll-margin-top: 24px; }
.poster-preview { display: flex; align-items: center; justify-content: center; width: 100%; aspect-ratio: 1.45; padding: 18px; background: var(--site-tint); border: 1px solid var(--site-line); }
.poster-card-current { display: grid; grid-template-columns: minmax(0, 460px) minmax(0, 1fr); align-items: center; gap: 48px; }
.poster-card-current .poster-preview { aspect-ratio: auto; }
.poster-card-current .poster-preview img { height: auto; }
.poster-card-current .poster-caption { padding-top: 0; max-width: 520px; }
.poster-card-current .poster-card-meta { justify-content: flex-start; gap: 8px 20px; }
.poster-preview img { display: block; width: 100%; height: 100%; object-fit: contain; }
.poster-preview:hover { border-color: var(--site-heading); }
.poster-caption { padding-top: 18px; }
.poster-card-meta { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 2px 12px; font-size: 12px; color: var(--site-muted); }
.poster-card-meta span:first-child { font-weight: 600; color: var(--site-heading); }
.poster-card h3 { margin: 8px 0 6px; font-size: 18px; font-weight: 600; line-height: 1.5; }
.poster-card-current h3 { font-size: clamp(22px, 2.5vw, 32px); margin-block: 16px; }
.poster-card h3 a { display: inline-block; min-height: 0; padding-block: 5px; text-decoration: none; }
.poster-caption p { margin: 0; font-size: 14px; }
.poster-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 20px; margin-top: 8px; }
.poster-actions a, .poster-neighbours a, .poster-gallery-footer a, .poster-history-link { font-size: 14px; }
.poster-pdf { color: var(--site-accent-ink); font-weight: 600; }
.poster-pdf:hover { color: var(--site-ink); }
.poster-card-current .poster-actions { margin-top: 20px; }
.poster-history-link { margin-top: 24px; }
.poster-caption .poster-note { margin-top: 6px; color: var(--site-muted); font-size: 12px; }
.poster-gallery-footer { display: flex; justify-content: space-between; align-items: baseline; gap: 24px; border-top: 1px solid var(--site-line); margin-top: 56px; padding-top: 24px; font-size: 14px; }
.poster-gallery-footer p { margin: 0; }
.poster-gallery-footer a { flex: none; }
.poster-detail-heading { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-top: 28px; }
.poster-detail-heading h1 { font-size: clamp(26px, 3vw, 38px); }
.poster-detail-heading p { margin-bottom: 0; }
.poster-detail-heading .poster-actions { flex: none; }
.poster-detail-note { margin: 20px 0 24px; color: var(--site-muted); font-size: 14px; }
.poster-detail-image { display: block; padding: 24px; background: var(--site-tint); border: 1px solid var(--site-line); cursor: zoom-in; }
.poster-detail-image img { display: block; max-width: 100%; width: auto; height: auto; margin: auto; }
.poster-detail-image:hover { border-color: var(--site-heading); }
.poster-neighbours { display: grid; grid-template-columns: 1fr auto 1fr; gap: 20px; align-items: start; margin-top: 24px; }
.poster-neighbours > span:last-child { text-align: right; }
@media (max-width: 1000px) {
  .poster-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .poster-card-current { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 28px; }
  .poster-detail-heading { display: block; }
}
@media (max-width: 600px) {
  .poster-gallery { width: calc(100% - 32px); margin-top: 12px; }
  .poster-gallery-heading { display: block; margin: 24px 0; }
  .poster-collection-note { text-align: left; margin-top: 16px; }
  .poster-collection-note br { display: initial; }
  .poster-section-nav { gap: 0 24px; }
  .poster-grid { grid-template-columns: 1fr; gap: 36px; }
  .poster-group { margin-top: 40px; }
  .poster-card-current { display: block; }
  .poster-card-current .poster-preview { padding: 16px; }
  .poster-card-current .poster-caption { padding-top: 18px; }
  .poster-gallery-footer, .poster-neighbours { display: block; }
  .poster-neighbours > span { display: block; }
  .poster-neighbours > span:last-child { text-align: left; }
  .poster-detail-image { padding: 8px; }
}

/* Sessions: one time axis everywhere; coral is the person, blue-grey the AI; the person's words in Songti. */
.sessions-wrap, .session-wrap { width: min(800px, calc(100% - 48px)); margin: 32px auto 64px; }
.sessions-heading h1, .session-title { margin: 32px 0 6px; }
.sessions-heading p { max-width: 44em; margin: 0; color: var(--site-muted); font-size: 15px; }
.sessions-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 16px; margin-top: 32px; }
.sessions-card-task { margin: 0; font-size: 15px; font-weight: 600; line-height: 1.6; }
.sessions-page { display: block; color: var(--site-muted); font-size: 13px; font-weight: 400; font-variant-numeric: tabular-nums; }
.sessions-card { display: flex; flex-direction: column; align-items: stretch; gap: 10px; padding: 16px 18px 18px; border: 1px solid var(--site-line); border-radius: 12px; background: var(--site-surface); }
.sessions-card:hover { color: inherit; border-color: var(--site-ai-soft); }
.sessions-card-head { display: flex; justify-content: space-between; margin: -6px 0 0; color: var(--site-muted); font-size: 13px; }
.sessions-card-head b { color: var(--site-ink); font-weight: 600; }
.sessions-card-head span { color: var(--site-muted); font-variant-numeric: tabular-nums; }
.sessions-card-you, .sessions-card-ai { margin: 0; padding: 8px 14px; border-radius: 16px; }
/* Clamp the text inside the bubble so a cut line never shows through the bubble's padding. */
.sessions-card-you span, .sessions-card-ai span { display: -webkit-box; overflow: hidden; -webkit-box-orient: vertical; -webkit-line-clamp: 3; }
.sessions-card-you { align-self: flex-end; max-width: 90%; border-bottom-right-radius: 5px; background: var(--site-accent-tint); font: 15px/1.75 var(--site-font-serif); }
.sessions-card-ai { align-self: flex-start; max-width: 90%; border: 1px solid var(--site-line); border-bottom-left-radius: 5px; color: var(--site-ink); font-size: 14px; line-height: 1.7; }
.sessions-card-pair { display: flex; align-items: flex-start; gap: 14px; }
.sessions-card-pair img { flex: none; width: 96px; height: auto; aspect-ratio: 236 / 334; object-fit: contain; border: 1px solid var(--site-line); background: var(--site-surface); }
.sessions-card-pair .sessions-card-you { min-width: 0; max-width: none; overflow-wrap: anywhere; }
.sessions-card-pair.is-wide img { width: 150px; aspect-ratio: 3 / 2; }
.sessions-card-pair .sessions-card-you span { -webkit-line-clamp: 5; }
.sessions-hatch { stroke: #c5d1d7; stroke-width: 2; }
.sessions-you { fill: var(--site-accent); }

.session-summary { max-width: 40em; margin: 0; color: var(--site-muted); font-size: 15px; }
.session-player { margin-top: 28px; }
.session-player.is-active { position: sticky; top: 0; z-index: 2; padding: 12px 0 10px; background: var(--site-paper); box-shadow: 0 10px 12px -12px #35455240; }
.session-player.is-active .session-stage { min-height: 96px; padding-block: 16px; }
.session-player.is-active .session-poster { grid-template-columns: minmax(0, 110px) minmax(0, 1fr); gap: 20px; }

.session-stage { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: 24px; min-height: 120px; padding: 24px 28px; border-radius: 10px; background: var(--site-tint); }
.session-play { display: grid; place-items: center; width: 52px; height: 52px; padding: 0; border: 0; border-radius: 50%; background: var(--site-heading); }
.session-play svg { width: 20px; height: 20px; fill: var(--site-surface); }
.session-now { min-width: 0; container-type: inline-size; }
.session-lead { margin: 0; font-size: 17px; }
.session-now-time { margin: 0; color: var(--site-muted); font-size: 13px; font-variant-numeric: tabular-nums; }
.session-now-what { margin: 2px 0 0; overflow: hidden; font-size: 21px; line-height: 1.5; white-space: nowrap; text-overflow: ellipsis; }
.session-now-what.is-you { color: var(--site-accent-ink); font-family: var(--site-font-serif); }
.session-now-sub { margin: 4px 0 0; overflow: hidden; color: var(--site-muted); font-size: 14px; white-space: nowrap; text-overflow: ellipsis; }
.session-ends { display: grid; grid-template-columns: repeat(2, minmax(0, 150px)) minmax(0, 1fr); gap: 20px; align-items: end; }
.session-poster { display: grid; grid-template-columns: minmax(0, 180px) minmax(0, 1fr); gap: 28px; align-items: center; }
.session-ends figure, .session-poster figure { margin: 0; }
.session-ends img, .session-poster img { display: block; width: 100%; height: auto; aspect-ratio: 236 / 334; object-fit: contain; border: 1px solid var(--site-line); background: var(--site-surface); }
.session-ends figcaption, .session-poster figcaption { margin-top: 6px; color: var(--site-muted); font-size: 13px; }
/* Slides and diagrams are landscape. Their versions share one 3:2 box, so the stage keeps its size from one
   version to the next. */
.session-ends.is-wide { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.session-ends.is-wide .session-lead { grid-column: 1 / -1; }
.session-poster.is-wide { grid-template-columns: minmax(0, 340px) minmax(0, 1fr); }
.session-player.is-active .session-poster.is-wide { grid-template-columns: minmax(0, 240px) minmax(0, 1fr); }
.session-ends.is-wide img, .session-poster.is-wide img { aspect-ratio: 3 / 2; }
/* The stage narrows long before the page does, so lay out by its own width. */
@container (max-width: 520px) {
  .session-ends { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .session-ends .session-lead { grid-column: 1 / -1; }
  .session-poster { grid-template-columns: minmax(0, 1fr); }
  .session-poster figure { max-width: 180px; }
  /* A landscape version stays beside the text; stacked at full width it would fill the sticky player. */
  .session-poster.is-wide, .session-player.is-active .session-poster.is-wide { grid-template-columns: minmax(0, 150px) minmax(0, 1fr); gap: 14px; }
  .session-poster.is-wide figure { max-width: none; }
}
.session-scrubber { display: block; width: 100%; height: auto; margin-top: 12px; overflow: visible; touch-action: none; }
.session-scrubber.is-ready { cursor: pointer; }
.session-scrubber:focus-visible, .session-play:focus-visible, .session-chip > summary:focus-visible { outline: 3px solid var(--site-focus); outline-offset: 3px; }
.session-busy { fill: var(--site-heading); opacity: .55; }
.session-idle { fill: var(--site-heading); opacity: .2; }
.session-playhead { stroke: var(--site-ink); stroke-width: 2; }
.session-log { display: flex; flex-direction: column; gap: 14px; margin: 40px 0 0; padding: 0; list-style: none; }
.session-time { align-self: center; color: var(--site-muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.session-entry { display: flex; flex-direction: column; align-items: flex-start; transition: opacity .2s; }
.session-entry.is-future { opacity: .3; }
.session-log.is-replaying .is-future { display: none; }
.session-log.is-replaying .session-entry, .session-log.is-replaying .session-time { animation: session-arrive .35s ease-out; }
@keyframes session-arrive { from { opacity: 0; transform: translateY(6px); } }
.session-you { align-items: flex-end; }
.session-bubble { max-width: min(36em, 85%); padding: 10px 16px; overflow-wrap: anywhere; border-radius: 18px; }
.session-you .session-bubble { border-bottom-right-radius: 6px; background: var(--site-accent-tint); font: 17px/1.85 var(--site-font-serif); }
.session-ai .session-bubble { border: 1px solid var(--site-line); border-bottom-left-radius: 6px; background: var(--site-surface); }
.session-entry.is-current .session-bubble, .session-entry.is-current .session-chip > summary { box-shadow: 0 0 0 2px var(--site-ai-soft); }
.session-bubble p, .session-detail p { margin: 0; }
.session-bubble p + p, .session-bubble ul, .session-bubble ol, .session-bubble table { margin-top: 8px; }
.session-bubble ul, .session-bubble ol { padding-left: 1.4em; }
/* Table cells keep numbers whole; a table too wide for its bubble scrolls sideways. */
.session-bubble table { display: block; max-width: 100%; overflow-x: auto; border-collapse: collapse; }
.session-bubble th, .session-bubble td { padding: 3px 14px 3px 0; overflow-wrap: normal; text-align: left; vertical-align: top; font-variant-numeric: tabular-nums; }
.session-who { display: block; margin-bottom: 2px; color: var(--site-muted); font: 12px/1.6 var(--site-font-body); }
.session-chip { max-width: 92%; }
.session-chip > summary { display: inline-flex; align-items: center; gap: 10px; min-height: 36px; padding: 4px 14px; border: 1px solid var(--site-line); border-radius: 999px; color: var(--site-muted); font-size: 13px; cursor: pointer; list-style: none; }
.session-chip > summary::-webkit-details-marker { display: none; }
.session-chip > summary::before { content: ""; flex: none; width: 6px; height: 6px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: rotate(-45deg); }
.session-chip[open] > summary::before { transform: rotate(45deg); }
.session-chip-body { margin: 8px 0 0 6px; padding: 2px 0 2px 14px; border-left: 2px solid var(--site-line); }
.session-chip-stats { margin: 0 0 6px; color: var(--site-muted); font-size: 13px; }
.session-steps { margin: 0; padding: 0; list-style: none; font-size: 13px; }
.session-steps li { padding: 2px 0; }
.session-steps summary, .session-step { display: grid; grid-template-columns: 72px minmax(0, 1fr); gap: 8px; color: var(--site-ink); cursor: default; }
.session-steps summary { cursor: pointer; }
.session-steps summary span, .session-step span { overflow-wrap: anywhere; }
.session-steps time { color: var(--site-muted); font-variant-numeric: tabular-nums; }
.session-steps pre { max-height: 320px; margin: 6px 0 8px 80px; padding: 10px 12px; overflow: auto; border: 1px solid var(--site-line); border-radius: 4px; background: var(--site-surface); font: 12px/1.6 ui-monospace, "SF Mono", Menlo, Consolas, monospace; white-space: pre-wrap; overflow-wrap: anywhere; }
.session-detail { margin: 4px 0 8px 80px; color: var(--site-muted); }
.session-thumbs { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0 0; }
.session-steps .session-thumbs { margin-left: 80px; }
.session-thumbs img { display: block; width: 96px; height: auto; border: 1px solid var(--site-line); background: var(--site-surface); }
.session-files .session-bubble { display: grid; gap: 6px; }
.session-file { display: grid; grid-template-columns: 56px minmax(0, 1fr); gap: 12px; align-items: center; padding: 6px; border-radius: 10px; }
.session-file:hover { color: inherit; background: var(--site-tint); }
.session-file img { display: block; width: 56px; height: auto; aspect-ratio: 236 / 334; object-fit: cover; border: 1px solid var(--site-line); background: var(--site-surface); }
.session-file b, .session-video b { display: block; font-weight: 600; }
.session-file small, .session-video small { display: block; color: var(--site-muted); font-size: 13px; }
.session-video { margin: 0; padding: 6px; }
.session-video video { display: block; width: 100%; height: auto; margin-bottom: 8px; border: 1px solid var(--site-line); border-radius: 6px; background: var(--site-surface); }
.session-audio { display: grid; gap: 6px; margin: 4px 0 8px 80px; padding: 0; list-style: none; }
.session-audio li { display: grid; grid-template-columns: 8em minmax(0, 1fr); gap: 8px; align-items: center; }
.session-audio audio { width: 100%; height: 32px; }
.session-note { margin: 40px 0 0; padding-top: 16px; border-top: 1px solid var(--site-line); color: var(--site-muted); font-size: 13px; }
@media (max-width: 540px) {
  .sessions-wrap, .session-wrap { width: calc(100% - 32px); margin-top: 16px; }
  .session-stage { gap: 16px; padding: 18px; }
  .session-now-what { font-size: 18px; }
  .session-bubble { max-width: 90%; }
  .session-steps summary, .session-step { grid-template-columns: 1fr; gap: 0; }
  .session-steps pre, .session-detail, .session-steps .session-thumbs, .session-audio { margin-left: 0; }
  .session-audio li { grid-template-columns: 1fr; gap: 2px; }
}