body { background: var(--page); }
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(rgba(248, 250, 252, 0.28), rgba(248, 250, 252, 0.28)), url("images/bg-lesson5.webp") center / cover no-repeat;
}
html[data-theme='dark'] body::before { background: linear-gradient(rgba(15, 23, 42, 0.86), rgba(15, 23, 42, 0.86)), url("images/bg-lesson5.webp") center / cover no-repeat; }
.journey, .task, .stage-heading { background: rgba(255, 255, 255, 0.94); }
html[data-theme='dark'] .journey, html[data-theme='dark'] .task, html[data-theme='dark'] .stage-heading { background: rgba(24, 34, 53, 0.95); }
.stage-heading { padding: 10px 16px; border: 1.5px solid var(--line); border-radius: var(--radius-md); }
@media print { body::before { display: none; } .journey, .task, .stage-heading { background: transparent; } }

.day-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(150px, 100%), 1fr)); gap: 10px; margin: 16px 0; }
.day-grid span { display: block; padding: 12px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); font-size: 20px; font-weight: 700; }
.day-grid small, .trait-grid small { display: block; font-size: 13px; font-weight: 400; color: var(--muted); }
.compare-rows p { padding: 10px 0; margin: 0; border-bottom: 1px solid var(--line); }
.compare-rows p:last-child { border-bottom: 0; }
.compare-rows span { color: var(--primary); }
.two-boxes { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin: 16px 0; }
.box-card { border: 2px solid var(--line); border-radius: var(--radius-md); padding: 18px; background: var(--surface); }
.box-card:first-child { border-color: var(--primary); }
.box-card:last-child { border-color: var(--secondary); }
.box-card h3 { font-size: 19px; }
.box-card .grammar-example { font-size: 18px; margin: 8px 0; }
.week-story { border-left: 4px solid var(--primary); padding-left: 16px; font-size: 20px; }
.week-story p { margin-bottom: 8px; }
.trait-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(170px, 100%), 1fr)); gap: 14px; margin: 16px 0; }
.trait-grid figure { margin: 0; border: 1px solid var(--line); border-radius: var(--radius-md); overflow: hidden; background: var(--surface); }
.trait-grid img { display: block; width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: cover; }
.trait-grid figcaption { padding: 8px 10px; font-weight: 700; }
.word-line { font-size: 17px; }
.summary-list li { margin-bottom: 8px; }
.link-row { display: flex; gap: 10px; flex-wrap: wrap; margin: 20px 0; }
.link-row .btn { font-size: 18px; padding: 12px 22px; }
.btn.primary { background: var(--primary); color: #ffffff; border-color: var(--primary); }
:root[data-theme='dark'] .btn.primary { color: #0f172a; }
.sort-boxes { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin: 18px 0; }
.sort-box { border: 2px dashed var(--line); border-radius: var(--radius-md); padding: 12px; min-height: 140px; background: var(--surface); }
.sort-box > button.drop { width: 100%; margin-bottom: 8px; text-align: left; justify-content: flex-start; flex-direction: column; align-items: flex-start; gap: 0; min-height: 52px; }
.sort-box > button.drop small { font-weight: 400; color: var(--muted); }
.sort-bank { display: flex; flex-wrap: wrap; gap: 8px; padding: 12px; border: 1px dashed var(--line); border-radius: var(--radius-md); min-height: 64px; }
.chip { font-size: 17px; text-align: left; }
.chip.wrong { border-color: var(--danger); background: var(--danger-soft); color: var(--danger-text); }
.chip.right { border-color: var(--success-border); background: var(--success-soft); color: var(--success-text); }
.chip.right::after { content: '✓'; margin-left: 8px; font-weight: 700; }
.chip.wrong::after { content: '✕'; margin-left: 8px; font-weight: 700; }
.chip:disabled, .sort-box > button.drop:disabled { opacity: 1; cursor: default; }
.sort-box > button.drop:disabled, .chip:disabled:not(.right):not(.wrong) { background: var(--soft); color: var(--text); }
.sort-box > button.drop:disabled small { color: var(--text); }
.notice { margin: 8px 0 0; font-weight: 600; color: var(--danger-text); }
.notice:empty { display: none; }
.sort-box .chip { display: flex; width: 100%; margin-top: 6px; }
.match-rows { display: grid; gap: 14px; margin: 18px 0; }
.match-row { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 12px; align-items: center; }
.match-row select { min-height: 44px; padding: 8px 10px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); font-size: 17px; }
.match-row select.answer-correct { border-color: var(--success-border); background: var(--success-soft); }
.formula { font-size: 21px; font-weight: 800; margin: 10px 0; }
.formula b { color: var(--primary); }
.form-table { display: grid; gap: 8px; margin: 10px 0; }
.form-table p { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; }
.form-table span { padding: 8px 14px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); font-size: 19px; font-weight: 700; }
.form-table .with-s span { border-color: var(--primary); }
.memo { background: var(--surface); border-left: 4px solid var(--primary); padding: 8px 12px; margin: 10px 0; }
.gap-rows { list-style: decimal inside; display: grid; gap: 14px; margin: 18px 0; padding: 0; }
.gap-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: 19px; overflow-wrap: anywhere; }
.gap-row input { width: min(9.5em, 100%); min-height: 44px; padding: 8px 10px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); color: inherit; font-size: 18px; }
.gap-row input.answer-correct { border-color: var(--success-border); background: var(--success-soft); }
.gap-row input.answer-incorrect { border-color: var(--danger); background: var(--danger-soft); }
.gap-verb { color: var(--muted); font-weight: 700; }
.match-row select.answer-incorrect { border-color: var(--danger); background: var(--danger-soft); }
.cue { padding: 14px 18px; background: var(--secondary-light); border-radius: var(--radius-md); margin: 16px 0; }
.manual-row { margin-top: 12px; }
.hint-panel { margin-top: 16px; padding: 14px 18px; border-left: 4px solid var(--secondary); background: var(--secondary-light); border-radius: 0 var(--radius-md) var(--radius-md) 0; }
html { scroll-padding-top: 120px; }
:root { --muted: #475569; }
@media (max-width: 760px), (max-height: 500px) {
  html { scroll-padding-top: 16px; }
  .topbar { position: static; }
}
@media (max-width: 760px) {
  .two-boxes, .sort-boxes, .match-row { grid-template-columns: 1fr; }
}
@media print {
  :root[data-theme='dark'] {
    color-scheme: light; --primary: #4f46e5; --primary-hover: #4338ca; --primary-light: #eef2ff; --secondary: #0284c7; --secondary-light: #e0f2fe;
    --page: #ffffff; --surface: #ffffff; --soft: #f1f5f9; --text: #0f172a; --muted: #475569; --line: #cbd5e1;
    --success-border: #15803d; --success-text: #166534; --success-soft: #dcfce7; --danger: #dc2626; --danger-text: #991b1b; --danger-soft: #fee2e2;
    --yellow-soft: #fef3c7; --header-bg: #ffffff;
  }
  .link-row { display: none; }
}
h2, .task .prompt, .task .instruction, .task .body-copy, .gap-row, .trait-grid figcaption, .chip, .token, .option-text, .brand-title { overflow-wrap: anywhere; }
.trait-grid, .day-grid { min-width: 0; }
.brand { min-height: 44px; }
.token, .chip { min-height: 44px; }
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }

.pic-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(150px, 100%), 1fr)); gap: 12px; margin: 16px 0; min-width: 0; }
.pic-card { margin: 0; padding: 0 0 10px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); text-align: center; overflow: hidden; }
.pic-card img { display: block; width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: cover; margin-bottom: 8px; }
.pic-card figcaption { font-weight: 700; font-size: 19px; padding: 0 8px; overflow-wrap: anywhere; }
.pic-card small { display: block; font-size: 14px; font-weight: 400; color: var(--muted); }
.hero-pic { margin: 0 0 16px; border-radius: var(--radius-md); overflow: hidden; border: 1px solid var(--line); line-height: 0; }
.hero-pic img { display: block; width: 100%; height: auto; max-height: 260px; object-fit: cover; object-position: center 40%; }
.song-card, .scene-card, .exercise-card { border: 2px solid var(--secondary); border-radius: 16px; background: var(--secondary-light); padding: 16px 18px; margin: 14px 0; font-size: 19px; line-height: 1.65; overflow-wrap: anywhere; }
.song-card p, .scene-card p, .exercise-card p { margin: 0 0 12px; }
.song-card p:last-child, .scene-card p:last-child, .exercise-card p:last-child { margin-bottom: 0; }
.song-card .song-indent { padding-left: 2em; }
.word-list { columns: 2 200px; column-gap: 24px; }
.talk-list { font-size: 19px; line-height: 1.6; padding-left: 1.4em; }
@media (max-width: 760px) {
  .song-card .song-indent { padding-left: 1em; }
  .topbar { backdrop-filter: none; }
  .hero-pic img { max-height: 170px; }
  .pic-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .pic-card figcaption { font-size: 17px; }
}