/* Advanced multi-skill activities and separate unit assessments — v0.6.0 */
.unit-pages-section { padding: 66px 0 82px; }
.unit-page-list { display: grid; gap: 16px; }
.unit-page-card {
    display: grid;
    grid-template-columns: 64px minmax(0, 1fr) auto auto;
    align-items: center;
    gap: 22px;
    padding: 27px 30px;
    border: 1px solid var(--line);
    border-radius: 22px;
    color: var(--ink);
    background: var(--surface);
    box-shadow: 0 12px 42px rgba(30, 41, 59, .06);
    text-decoration: none;
    transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.unit-page-card:hover { transform: translateY(-2px); border-color: var(--primary); box-shadow: 0 18px 48px rgba(49, 46, 129, .12); }
.unit-page-order { color: color-mix(in srgb, var(--primary) 62%, var(--muted)); font-family: Georgia, serif; font-size: 31px; }
.unit-page-card h3 { margin: 0 0 7px; font-size: 23px; }
.unit-page-card p { margin: 0 0 13px; color: var(--muted); line-height: 1.6; }
.unit-page-card > small { color: var(--muted); font-weight: 750; white-space: nowrap; }
.unit-page-card > b { color: var(--primary); font-size: 22px; }
.page-skill-chips { display: flex; flex-wrap: wrap; gap: 7px; }
.page-skill-chips span { padding: 6px 9px; border: 1px solid color-mix(in srgb, var(--chip-color, var(--primary)) 35%, var(--line)); border-radius: 999px; color: var(--chip-color, var(--primary)); background: color-mix(in srgb, var(--chip-color, var(--primary)) 8%, var(--surface)); font-size: 10px; font-weight: 850; }
.hero-skill-chips { margin-top: 18px; }
.hero-skill-chips span { --chip-color: var(--primary); }

.unit-assessment-section { padding: 68px 0 96px; border-top: 1px solid var(--line); background: linear-gradient(180deg, var(--surface-soft), var(--surface)); }
.assessment-separator { display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 22px; margin-bottom: 28px; }
.assessment-separator > span { display: grid; min-width: 116px; min-height: 116px; place-items: center; border-radius: 28px; color: #fff; background: linear-gradient(135deg, #111827, #4f46e5); font-size: 12px; font-weight: 950; letter-spacing: .12em; }
.assessment-separator h2 { margin: 0 0 8px; font-size: 34px; }
.assessment-separator p { margin: 0; color: var(--muted); }
.assessment-card-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 15px; }
.assessment-link-card { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 23px; border: 1px solid var(--line); border-radius: 18px; color: var(--ink); background: var(--surface); text-decoration: none; }
.assessment-link-card strong, .assessment-link-card span { display: block; }
.assessment-link-card strong { margin-bottom: 6px; font-size: 18px; }
.assessment-link-card span { color: var(--muted); font-size: 12px; }
.assessment-link-card b { color: var(--primary); white-space: nowrap; }

.lesson-sidebar a { display: flex; align-items: center; gap: 8px; }
.lesson-sidebar a > span { width: 7px; height: 7px; border-radius: 50%; background: var(--dot); }
.advanced-activity-card { position: relative; border-top: 4px solid var(--activity-accent); }
.activity-label-line { display: flex; flex-wrap: wrap; align-items: center; gap: 7px; }
.activity-label-line > span { color: var(--activity-accent) !important; }
.activity-label-line b, .activity-label-line em { padding: 5px 8px; border-radius: 999px; font-size: 9px; font-style: normal; font-weight: 900; letter-spacing: .06em; text-transform: uppercase; }
.activity-label-line b { color: var(--activity-accent); background: color-mix(in srgb, var(--activity-accent) 10%, var(--surface)); }
.activity-label-line em { color: var(--muted); background: var(--surface-soft); }
.activity-state { display: grid; justify-items: end; gap: 8px; }
.complete-badge { padding: 6px 10px; border-radius: 999px; color: #047857; background: #d1fae5; font-size: 10px; font-weight: 900; }
.activity-lock { display: grid; justify-items: center; gap: 7px; padding: 42px 28px; color: var(--muted); background: repeating-linear-gradient(135deg, var(--surface-soft), var(--surface-soft) 12px, var(--surface) 12px, var(--surface) 24px); text-align: center; }
.activity-lock > span { font-size: 28px; }
.activity-lock strong { color: var(--ink); font-size: 18px; }
.activity-lock p { margin: 0; }
.advanced-activity-card.is-locked .quiz-form,
.advanced-activity-card.is-locked .listening-player,
.advanced-activity-card.is-locked .transcript-panel,
.advanced-activity-card.is-locked .teacher-feedback-card,
.advanced-activity-card.is-locked .review-pending-card { display: none; }

.listening-player { display: grid; grid-template-columns: minmax(150px, .8fr) minmax(260px, 2fr) auto; align-items: center; gap: 18px; padding: 20px 34px; border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--activity-accent) 5%, var(--surface)); }
.listening-player strong, .listening-player small { display: block; }
.listening-player small { margin-top: 4px; color: var(--muted); }
.listening-player audio { width: 100%; }
.speed-control { display: grid; gap: 4px; color: var(--muted); font-size: 10px; font-weight: 850; }
.speed-control select { padding: 8px; border: 1px solid var(--line); border-radius: 9px; color: var(--ink); background: var(--surface); }
.transcript-panel { margin: 20px 34px 0; padding: 15px 18px; border: 1px dashed color-mix(in srgb, var(--activity-accent) 38%, var(--line)); border-radius: 14px; background: var(--surface-soft); }
.transcript-panel summary { color: var(--activity-accent); cursor: pointer; font-weight: 850; }
.transcript-panel p { margin: 12px 0 0; color: var(--muted); white-space: pre-wrap; line-height: 1.75; }

.voice-recorder { display: grid; gap: 13px; padding: 17px; border: 1px dashed color-mix(in srgb, var(--primary) 40%, var(--line)); border-radius: 15px; background: var(--surface-soft); }
.recorder-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 9px; }
.recorder-actions > span { margin-left: auto; color: var(--primary); font-variant-numeric: tabular-nums; font-weight: 900; }
.voice-recorder audio { width: 100%; }
.voice-recorder input[type="file"] { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.voice-recorder small { color: var(--muted); line-height: 1.55; }
.writing-answer textarea { min-height: 180px; resize: vertical; }
.writing-answer > small { justify-self: end; color: var(--muted); }
.draft-status { min-height: 18px; color: var(--muted); font-size: 11px; }
.flashcard { position: relative; display: grid; width: 100%; min-height: 180px; place-items: center; padding: 24px; border: 1px solid var(--line); border-radius: 18px; color: var(--ink); background: linear-gradient(135deg, var(--surface), var(--surface-soft)); cursor: pointer; font: inherit; text-align: center; transform-style: preserve-3d; }
.flashcard-front, .flashcard-back { font-size: 20px; font-weight: 850; }
.flashcard-back { display: none; color: var(--primary); }
.flashcard.is-flipped .flashcard-front { display: none; }
.flashcard.is-flipped .flashcard-back { display: block; }
.teacher-feedback-card, .review-pending-card { margin: 20px 34px 0; padding: 16px 18px; border-radius: 14px; }
.teacher-feedback-card { border: 1px solid #a7f3d0; color: #065f46; background: #ecfdf5; }
.teacher-feedback-card span { font-size: 10px; font-weight: 950; letter-spacing: .08em; text-transform: uppercase; }
.teacher-feedback-card p { margin: 7px 0 0; white-space: pre-wrap; }
.review-pending-card { color: #854d0e; background: #fef3c7; }
.manual-assignment-note { display: grid; gap: .3rem; margin: 1rem 0; padding: .9rem 1rem; border: 1px solid #f0d58b; border-radius: 14px; color: #684b00; background: #fff8df; }
.manual-assignment-note span { font-size: .9rem; line-height: 1.5; }

.assessment-hero { padding: 56px 0; color: #fff; background: linear-gradient(135deg, #111827, #312e81 62%, #4f46e5); }
.assessment-hero .back-link { color: #c7d2fe; }
.assessment-hero h1 { margin: 18px 0 11px; font-size: clamp(38px, 6vw, 64px); }
.assessment-hero p { max-width: 720px; color: #dbeafe; line-height: 1.7; }
.assessment-facts { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 22px; }
.assessment-facts span { padding: 8px 11px; border: 1px solid rgba(255,255,255,.2); border-radius: 999px; background: rgba(255,255,255,.08); font-size: 11px; font-weight: 800; }
.assessment-section, .assessment-result-section { min-height: 55vh; padding: 62px 0 96px; background: var(--surface-soft); }
.assessment-form { display: grid; gap: 18px; }
.assessment-history { display: grid; gap: 8px; margin-top: 34px; padding: 22px; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); }
.assessment-history h2 { margin: 0 0 8px; }
.assessment-history span { color: var(--muted); }
.assessment-result-card { display: grid; justify-items: center; padding: 52px 34px; border: 1px solid var(--line); border-radius: 26px; background: var(--surface); box-shadow: 0 18px 58px rgba(30,41,59,.1); text-align: center; }
.assessment-result-card h1 { margin: 15px 0 20px; }
.result-score { display: grid; width: 150px; height: 150px; place-items: center; border-radius: 50%; color: #fff; background: linear-gradient(135deg, var(--primary), var(--violet)); font-size: 38px; }
.result-pending { padding: 15px 20px; border-radius: 14px; color: #854d0e; background: #fef3c7; }

.teacher-page-section { min-height: 62vh; padding: 58px 0 96px; background: var(--surface-soft); }
.teacher-page-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 28px; margin-bottom: 30px; }
.teacher-page-heading h1, .review-hero h1 { margin: 12px 0 8px; font-size: clamp(34px, 5vw, 54px); }
.teacher-page-heading p, .review-hero p { margin: 0; color: var(--muted); }
.review-list { display: grid; gap: 10px; }
.review-row { display: grid; grid-template-columns: 1.3fr 1fr auto; align-items: center; gap: 20px; padding: 20px 22px; border: 1px solid var(--line); border-radius: 16px; color: var(--ink); background: var(--surface); text-decoration: none; }
.review-row strong, .review-row span, .review-row small { display: block; }
.review-row span, .review-row small { margin-top: 4px; color: var(--muted); }
.review-row b { color: var(--primary); }
.review-hero { margin: 26px 0; }
.review-form { display: grid; gap: 18px; }
.review-answer-card, .rubric-panel, .feedback-field { padding: 24px; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); }
.review-answer-card header { display: flex; justify-content: space-between; color: var(--primary); font-size: 11px; font-weight: 900; text-transform: uppercase; }
.review-answer-card h2 { margin: 14px 0; font-size: 18px; }
.review-answer-card audio { width: 100%; }
.student-written-answer { padding: 16px; border-radius: 12px; background: var(--surface-soft); white-space: pre-wrap; line-height: 1.7; }
.score-field { display: flex; align-items: center; gap: 9px; margin-top: 17px; }
.score-field input { width: 100px; padding: 10px; border: 1px solid var(--line); border-radius: 9px; }
.auto-grade-note { color: var(--muted); }
.rubric-panel h2 { margin-top: 0; }
.rubric-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.rubric-grid label, .feedback-field { display: grid; gap: 7px; }
.rubric-grid label { padding: 15px; border-radius: 12px; background: var(--surface-soft); }
.rubric-grid small { color: var(--muted); }
.rubric-grid input, .feedback-field textarea { padding: 11px; border: 1px solid var(--line); border-radius: 10px; color: var(--ink); background: var(--surface); }

@media (max-width: 820px) {
    .unit-page-card { grid-template-columns: 48px minmax(0, 1fr) auto; }
    .unit-page-card > small { grid-column: 2 / -1; }
    .assessment-card-grid, .rubric-grid { grid-template-columns: 1fr; }
    .listening-player { grid-template-columns: 1fr; }
    .review-row { grid-template-columns: 1fr auto; }
    .review-row > div:nth-child(2) { grid-column: 1 / -1; }
}

@media (max-width: 600px) {
    .unit-page-card { grid-template-columns: 1fr auto; padding: 21px; }
    .unit-page-order { font-size: 23px; }
    .unit-page-card > div, .unit-page-card > small { grid-column: 1 / -1; }
    .assessment-separator { grid-template-columns: 1fr; }
    .assessment-separator > span { min-width: 0; min-height: 72px; }
    .activity-card-header { padding: 23px 20px; }
    .quiz-form { padding: 22px 18px 27px; }
    .listening-player { padding: 18px 20px; }
    .transcript-panel, .teacher-feedback-card, .review-pending-card { margin-inline: 20px; }
    .matching-grid, .ordering-grid { grid-template-columns: 1fr; }
    .teacher-page-heading { align-items: flex-start; flex-direction: column; }
    .review-row { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
    .unit-page-card, .flashcard { transition: none; }
}