@layer lab {
  body { background: var(--color-paper); color: var(--color-ink); }
  body > header {
    width: min(100%, var(--content-max));
    margin-inline: auto;
    padding: max(2rem, env(safe-area-inset-top)) max(var(--page-gutter), env(safe-area-inset-right)) 2rem max(var(--page-gutter), env(safe-area-inset-left));
    border-bottom: 1px solid var(--color-line);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
  }
  body > header > a { white-space: nowrap; font: 400 1.15rem/1 var(--font-display); letter-spacing: .04em; text-decoration: none; }
  .header-actions { display: flex; align-items: center; justify-content: flex-end; gap: clamp(.8rem,2vw,1.5rem); }
  .header-nav { display: flex; align-items: center; gap: clamp(1rem,2vw,1.8rem); }
  .header-nav a, .header-menu nav a { color: var(--color-muted); font-size: .68rem; letter-spacing: .12em; text-decoration: none; text-transform: uppercase; white-space: nowrap; }
  .header-nav a:hover, .header-menu nav a:hover { color: var(--color-ink); }
  .header-menu { display: none; position: relative; }
  .header-menu summary { width: var(--tap-size); height: var(--tap-size); display: grid; place-items: center; border: 1px solid var(--color-ink); border-radius: 999px; cursor: pointer; list-style: none; font-size: 1.15rem; }
  .header-menu summary::-webkit-details-marker { display: none; }
  .header-menu nav { position: absolute; z-index: 10; top: calc(100% + .6rem); right: 0; min-width: 10rem; padding: .45rem 1rem; border: 1px solid var(--color-line); background: var(--color-paper); box-shadow: 0 .5rem 1.5rem rgb(0 0 0 / 8%); }
  .header-menu nav a { min-height: var(--tap-size); display: flex; align-items: center; }
  .signout { margin: 0; }
  .signout input { display: none; }
  body > main { width: min(100%, var(--content-max)); margin-inline: auto; padding: clamp(3rem,7vw,7rem) var(--page-gutter) var(--section-space); }
  main.login { max-width: 48rem; margin-inline: auto; }
  main > nav { display: flex; flex-wrap: wrap; gap: .5rem clamp(1.2rem,3vw,2.5rem); margin-bottom: clamp(3rem,6vw,6rem); padding-bottom: 1.25rem; border-bottom: 1px solid var(--color-line); }
  main > nav a { min-height: var(--tap-size); display: inline-flex; align-items: center; color: var(--color-muted); font-size: .68rem; letter-spacing: .14em; text-decoration: none; text-transform: uppercase; }
  main > nav a:hover { color: var(--color-ink); }
  h1 { max-width: 18ch; margin: .8rem 0 1.5rem; font: 400 clamp(2.7rem,6vw,6rem)/1.04 var(--font-display); letter-spacing: -.045em; overflow-wrap: anywhere; }
  h1 em { color: var(--color-gold); font-style: normal; font-weight: 400; }
  .modules-heading { max-width: none; white-space: nowrap; overflow-wrap: normal; }
  .modules-heading span, .modules-heading em { display: inline; }
  .archive-title-en { margin: clamp(-1rem,-1.5vw,-.55rem) 0 1.5rem; color: var(--color-gold); font: 400 clamp(1.1rem,2vw,1.55rem)/1.35 var(--font-display); }
  h1:has(+ .muted) { max-width: none; }
  h2 { margin-bottom: 1rem; font: 400 clamp(1.35rem,2.4vw,2rem)/1.2 var(--font-display); }
  p { line-height: 1.7; }
  .eyebrow { color: var(--color-muted); font-size: .65rem; letter-spacing: .2em; line-height: 1.5; text-transform: uppercase; }
  .muted { color: var(--color-muted); }
  .panel { margin: clamp(2rem,4vw,3.5rem) 0 0; padding: clamp(1.5rem,3vw,2.5rem) 0; border-top: 1px solid var(--color-line); }
  .panel > :last-child { margin-bottom: 0; }
  .notice { margin: 2rem 0; padding: 1.2rem 1.4rem; border-left: 2px solid var(--color-gold); background: rgb(188 167 123 / 10%); color: var(--color-muted); font-size: .88rem; }
  .stats { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: clamp(1rem,2.5vw,2rem); margin-top: clamp(2rem,4vw,3rem); }
  .stats .panel { margin: 0; padding: 1.5rem; border: 1px solid var(--color-line); }
  .stats strong { display: block; margin-bottom: 1rem; font: 400 clamp(2rem,4vw,3.5rem)/1 var(--font-display); white-space: nowrap; }
  label { display: block; margin: 1.2rem 0 .5rem; color: var(--color-muted); font-size: .78rem; letter-spacing: .06em; }
  input, select, textarea { display: block; width: 100%; margin-top: .55rem; padding: .9rem 1rem; border: 1px solid var(--color-line); border-radius: 0; background: transparent; color: var(--color-ink); font: inherit; }
  textarea { resize: vertical; }
  button, .button { min-height: var(--tap-size); padding: .8rem 1.2rem; border: 1px solid var(--color-ink); border-radius: 999px; background: var(--color-ink); color: #fff; cursor: pointer; font: 400 .7rem/1 var(--font-ui); letter-spacing: .1em; text-transform: uppercase; }
  .button { display: inline-flex; align-items: center; justify-content: center; text-decoration: none; }
  button:hover, .button:hover { background: transparent; color: var(--color-ink); }
  button.secondary, .button.secondary { background: transparent; color: var(--color-ink); }
  button.secondary:hover, .button.secondary:hover { background: var(--color-ink); color: #fff; }
  button:focus-visible, .button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, audio:focus-visible { outline: 2px solid var(--color-gold); outline-offset: 4px; }
  .search { display: flex; align-items: end; gap: 1rem; margin: 2rem 0; }
  .search label { flex: 1; margin: 0; }
  .record { display: grid; grid-template-columns: 6rem minmax(0,1fr) 5.5rem; gap: 1rem; padding: 1.25rem .5rem; border-top: 1px solid var(--color-line); color: var(--color-ink); font-size: .86rem; text-decoration: none; align-items: center; }
  .record:hover { background: rgb(188 167 123 / 8%); }
  .record span { overflow-wrap: anywhere; }
  .record > span:last-child { white-space: nowrap; text-align: right; }
  .record-link-mark { font-family: Arial, Helvetica, sans-serif; font-style: normal; }
  .date { color: var(--color-muted); font-variant-numeric: tabular-nums; }
  .file-title { max-width: none; font-size: clamp(2.2rem,5vw,4.5rem); }
  .recording-heading .file-title { margin-bottom: clamp(.55rem,1.2vw,.85rem); line-height: 1; }
  .recording-meta { margin: 0; font-size: clamp(1rem,1.6vw,1.2rem); line-height: 1.5; }
  .player audio { display: block; width: 100%; margin: 1.25rem 0; accent-color: var(--color-gold); }
  details summary { min-height: var(--tap-size); padding: .8rem 0; cursor: pointer; color: var(--color-muted); }
  blockquote { margin: 1rem 0; padding: 1rem 1.25rem; border-left: 2px solid var(--color-gold); background: rgb(188 167 123 / 8%); }
  article[id] { scroll-margin-top: 1.5rem; }
  .segment { padding: 1rem 0; border-top: 1px solid var(--color-line); }
  .lesson-summary > h2 { max-width: min(100%,34ch); margin-bottom: .35rem; font-size: clamp(2rem,4vw,3.7rem); text-wrap: balance; word-break: auto-phrase; }
  .lesson-summary > h2 .title-line { display: block; }
  .lesson-summary > h2 .title-phrase { display: inline-block; }
  .lesson-summary > h2 .title-term { white-space: nowrap; }
  .summary-en { color: var(--color-gold); font: 400 clamp(1.15rem,2vw,1.6rem)/1.35 var(--font-display); }
  .summary-overview { max-width: 100%; margin: 2rem 0 clamp(2rem,5vw,4rem); font-size: clamp(1rem,1.6vw,1.2rem); }
  .summary-overview p + p, .summary-section p + p, .summary-actions p + p { margin-top: .75rem; color: var(--color-muted); }
  .summary-section { display: grid; grid-template-columns: 2.25rem minmax(0,1fr); column-gap: clamp(1rem,2.5vw,2.5rem); padding: clamp(1.8rem,4vw,3rem) 0; border-top: 1px solid var(--color-line); }
  .summary-section .eyebrow { grid-row: 1 / span 5; font-size: .9rem; letter-spacing: .14em; }
  .summary-section h3, .summary-actions h3 { margin: 0 0 1rem; font: 400 clamp(1.35rem,2.3vw,2rem)/1.25 var(--font-display); }
  .summary-section h3 span { display: block; }
  .summary-section h3 span[lang="en"] { margin-top: .35rem; color: var(--color-muted); font-size: .72em; }
  .summary-section details { margin-top: .75rem; }
  button.time-evidence { min-height: 2.25rem; margin: .25rem .55rem .25rem 0; padding: .45rem .7rem; border-color: var(--color-line); border-radius: 0; background: transparent; color: var(--color-muted); font-size: .7rem; letter-spacing: .04em; text-transform: none; }
  button.time-evidence:hover { border-color: var(--color-gold); background: rgb(188 167 123 / 8%); color: var(--color-ink); }
  button.time-evidence.is-playing { border-color: var(--color-gold); background: var(--color-ink); color: #fff; }
  .summary-section details { margin-top: .75rem; }
  .summary-actions { margin-top: 2rem; padding: clamp(1.3rem,3vw,2rem); border-left: 2px solid var(--color-gold); background: rgb(188 167 123 / 8%); }
  .summary-actions p { white-space: pre-line; }
  .spec { max-width: 100%; white-space: pre-wrap; overflow-wrap: anywhere; color: var(--color-muted); font: .82rem/1.75 var(--font-ui); }
  .note { white-space: pre-wrap; overflow-wrap: anywhere; }
  code, strong { font-variant-numeric: tabular-nums; }
}

@media (max-width: 700px) {
  .lesson-summary > h2 .title-phrase { display: inline; }
}

@layer lab {
  @media (min-width: 64.001rem) {
    .archive-heading { max-width: none; white-space: nowrap; overflow-wrap: normal; }
  }
  @media (max-width: 64rem) {
    body > header { padding-block: max(1.25rem,env(safe-area-inset-top)) 1.25rem; }
    body > main { padding-top: 2.5rem; }
    main > nav { margin-bottom: 3rem; }
    .stats { grid-template-columns: repeat(3,minmax(0,1fr)); gap: clamp(.45rem,2vw,1rem); }
    .stats .panel { display: block; }
    .stats .panel { padding: clamp(.75rem,3vw,1.5rem); }
    .stats strong { margin: 0 0 .75rem; font-size: clamp(1.45rem,7vw,3rem); }
    .stats .panel p { margin: 0; text-align: left; }
    .record { grid-template-columns: 5.7rem minmax(0,1fr) 5.2rem; gap: .65rem; }
    .search { align-items: stretch; flex-direction: column; }
    .search button { width: 100%; }
    input, select, textarea { font-size: 16px; }
    h1:has(+ .muted) em { display: block; }
  }
  @media (max-width: 30rem) {
    body > header { gap: .75rem; }
    body > header > a { font-size: clamp(.78rem,3.8vw,1rem); }
    .header-actions { gap: .45rem; }
    .header-nav { display: none; }
    .header-menu { display: block; order: 2; }
    .signout { order: 1; }
    .signout button { padding-inline: .8rem; font-size: .62rem; }
    main > nav { gap: .35rem 1rem; }
    main > nav a { font-size: .62rem; letter-spacing: .09em; }
    .archive-heading em { display: block; white-space: nowrap; }
    .modules-heading { white-space: normal; }
    .modules-heading span, .modules-heading em { display: block; }
    .modules-heading em { white-space: nowrap; }
    .stats strong { font-size: clamp(1.35rem,6vw,2.25rem); }
    .stats .panel p { font-size: clamp(.62rem,2.8vw,.78rem); line-height: 1.45; overflow-wrap: anywhere; }
    .summary-section { display: block; }
    .summary-section .eyebrow { margin-bottom: .75rem; }
  }
}