/* ═══════════════════════════════════════════════
   Pflege Akademie — Lesson UI Components
   Sidebar layout + lesson blocks (notes, steps,
   keypoints, exam questions)
   Deep midnight design language — requires style.css
   ═══════════════════════════════════════════════ */

/* ── Lesson page layout (sidebar + main) ── */
.lesson-layout {
    display: flex;
    min-height: calc(100vh - 70px);
    padding-top: 70px;
}

.lesson-sidebar {
    width: 280px;
    flex-shrink: 0;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-subtle);
    padding: var(--space-md) 0;
    position: sticky;
    top: 70px;
    height: calc(100vh - 70px);
    overflow-y: auto;
}

.lesson-sidebar-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    padding: 0 var(--space-sm) var(--space-xs);
}

.lesson-sidebar-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 11px var(--space-sm);
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.86rem;
    border-left: 3px solid transparent;
    transition: all 0.25s var(--ease-out);
}

.lesson-sidebar-item:hover {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-primary);
}

.lesson-sidebar-item.active {
    background: rgba(60, 168, 118, 0.08);
    border-left-color: var(--accent-teal);
    color: var(--accent-teal);
}

.lesson-sidebar-item .ls-icon { font-size: 1.05rem; flex-shrink: 0; }
.lesson-sidebar-item .ls-text { flex: 1; line-height: 1.35; }

.lesson-main {
    flex: 1;
    padding: var(--space-md);
    max-width: 900px;
}

.lesson-breadcrumb {
    font-size: 0.83rem;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
}
.lesson-breadcrumb a { color: var(--accent-teal); text-decoration: none; }
.lesson-breadcrumb a:hover { text-decoration: underline; }

/* ── Module header ── */
.lesson-header { margin-bottom: var(--space-md); }
.lesson-header-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    font-family: var(--font-mono);
    color: var(--accent-teal);
    background: rgba(60, 168, 118, 0.08);
    border: 1px solid var(--border-accent);
    border-radius: var(--radius-full);
    padding: 4px 14px;
    margin-bottom: 10px;
}
.lesson-header h1 {
    font-family: var(--font-display);
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: 700;
    letter-spacing: -0.01em;
}
.lesson-header p { color: var(--text-muted); font-size: 0.9rem; margin-top: 4px; }

/* ── Chapter (lesson) blocks ── */
.lsn-chapter {
    background: var(--grad-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin-bottom: var(--space-md);
}

.lsn-chapter-head {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: var(--space-sm);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--border-subtle);
}

.lsn-chapter-num {
    width: 32px; height: 32px;
    border-radius: 50%;
    background: var(--grad-teal);
    color: #06251f;
    display: flex; align-items: center; justify-content: center;
    font-weight: 700;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    flex-shrink: 0;
}

.lsn-chapter-head h2 { font-size: 1.05rem; font-weight: 600; }

/* Notes block */
.lsn-notes {
    font-size: 0.9rem;
    line-height: 1.85;
    color: var(--text-primary);
}
.lsn-notes b { color: var(--accent-teal); font-weight: 600; }

/* Procedure steps */
.lsn-steps { margin: var(--space-sm) 0; }
.lsn-steps h4 {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-teal);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 10px;
}
.lsn-step {
    padding: 9px 14px 9px 16px;
    margin: 5px 0;
    background: var(--bg-primary);
    border-left: 3px solid var(--accent-teal);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.87rem;
    line-height: 1.6;
    color: var(--text-secondary);
    counter-increment: step;
}
.lsn-steps { counter-reset: step; }
.lsn-step::before {
    content: counter(step) '. ';
    font-weight: 700;
    color: var(--accent-teal);
    font-family: var(--font-mono);
}

/* Key points */
.lsn-keypoints {
    background: rgba(60, 168, 118, 0.05);
    border: 1px solid var(--border-accent);
    border-radius: var(--radius-sm);
    padding: var(--space-sm);
    margin: var(--space-sm) 0;
}
.lsn-keypoints h4 {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-teal);
    margin-bottom: 8px;
}
.lsn-keypoints ul { list-style: none; }
.lsn-keypoints li {
    padding: 4px 0 4px 20px;
    position: relative;
    font-size: 0.87rem;
    color: var(--text-primary);
    line-height: 1.6;
}
.lsn-keypoints li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-mint);
    font-weight: 700;
}

/* Exam question block */
.lsn-exam-q {
    background: var(--bg-primary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: var(--space-sm);
    margin: var(--space-sm) 0;
}
.lsn-q-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--accent-lavender);
    margin-bottom: 6px;
}
.lsn-q-text { font-weight: 600; font-size: 0.92rem; margin-bottom: 10px; color: var(--text-primary); }
.lsn-q-option {
    display: block;
    padding: 8px 14px;
    margin: 4px 0;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-subtle);
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: all 0.2s var(--ease-out);
}
.lsn-q-option:hover { border-color: var(--accent-teal); }
.lsn-q-option.reveal-correct { background: rgba(60, 168, 118, 0.12); border-color: var(--accent-mint); color: var(--accent-mint); }
.lsn-q-explanation {
    margin-top: 10px;
    padding: 10px;
    background: rgba(167, 139, 250, 0.06);
    border-left: 3px solid var(--accent-lavender);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.84rem;
    color: var(--text-secondary);
    display: none;
}
.lsn-q-explanation.show { display: block; }

/* Bottom prev/next nav */
.lesson-bottom-nav {
    display: flex;
    justify-content: space-between;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-subtle);
    flex-wrap: wrap;
}
.lesson-bottom-nav > div { display: flex; gap: var(--space-xs); flex-wrap: wrap; }

/* Responsive */
@media (max-width: 900px) {
    .lesson-layout { flex-direction: column; }
    .lesson-sidebar {
        width: 100%;
        position: static;
        height: auto;
        max-height: 300px;
        border-right: none;
        border-bottom: 1px solid var(--border-subtle);
    }
    .lesson-main { max-width: 100%; }
}

/* Video links (B2C content expansion 2026-08-02) */
.lsn-video-link {
    display: flex; align-items: baseline; gap: 10px;
    padding: 8px 0; font-size: 0.9rem; color: var(--text-secondary);
    text-decoration: none; border-bottom: 1px solid var(--border-subtle);
}
.lsn-video-link:last-child { border-bottom: none; }
.lsn-video-link:hover { color: var(--accent-teal); }
.lsn-video-channel {
    font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-muted);
    white-space: nowrap; margin-left: auto; padding-left: 12px;
}
.lsn-chapter .lsn-video-link { margin-top: 4px; }


/* ---------- SOURCES & VIDEOS DROPDOWN ---------- */
.sources-box {
    margin-top: 18px;
    background: var(--surface-2);
    border: 1px solid var(--line);
    border-radius: 10px;
    overflow: hidden;
}
.sources-box > summary {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 13px 16px;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--ink);
    list-style: none;
    user-select: none;
    transition: background-color 0.15s;
}
.sources-box > summary::-webkit-details-marker { display: none; }
.sources-box > summary:hover { background: var(--surface-3); }
.sources-box > summary .src-icon {
    width: 26px; height: 26px; border-radius: 7px;
    background: var(--accent-soft); color: var(--accent);
    display: grid; place-items: center; flex-shrink: 0;
}
.sources-box > summary .src-icon svg { width: 14px; height: 14px; }
.sources-box > summary .src-count {
    margin-left: auto;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--accent);
    background: var(--accent-soft);
    border-radius: 100px;
    padding: 3px 10px;
}
.sources-box > summary::after {
    content: '';
    width: 10px; height: 10px;
    border-right: 2px solid var(--muted);
    border-bottom: 2px solid var(--muted);
    transform: rotate(45deg);
    transition: transform 0.2s;
    flex-shrink: 0;
}
.sources-box[open] > summary::after { transform: rotate(-135deg); }
.sources-list { padding: 4px 16px 12px; }
.src-item {
    display: flex; align-items: flex-start; gap: 10px;
    padding: 9px 0; text-decoration: none;
    border-top: 1px solid var(--line);
    color: var(--ink);
}
.src-item:first-child { border-top: none; }
.src-item:hover .src-title { color: var(--accent); }
.src-play {
    width: 24px; height: 24px; border-radius: 6px;
    background: var(--accent); color: #fff;
    display: grid; place-items: center; flex-shrink: 0; margin-top: 1px;
}
.src-play svg { width: 11px; height: 11px; }
.src-meta { min-width: 0; flex: 1; }
.src-title { font-size: 0.84rem; font-weight: 600; line-height: 1.45; transition: color 0.15s; }
.src-sub {
    display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
    font-size: 0.72rem; color: var(--muted); margin-top: 4px;
}
.src-channel { font-weight: 600; }
.src-dur { font-family: 'JetBrains Mono', monospace; font-size: 0.7rem; color: var(--faint); }
.src-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 6px; }
.src-tag {
    font-size: 0.66rem; font-weight: 600; letter-spacing: 0.03em;
    color: var(--accent); background: var(--accent-soft);
    border: 1px solid var(--accent-line);
    border-radius: 100px; padding: 2px 9px;
}
.src-note { font-size: 0.75rem; color: var(--muted); font-style: italic; margin-top: 4px; }

/* ═══════════════════════════════════════════════
   QUIZ / EXAM STATE TREATMENTS (per design-system-reference §4)
   Using --success / --error semantic tokens.
   Principle: no red during active answering; red only in results + explanation.
   ═══════════════════════════════════════════════ */

/* Correct answer — green accent, checkmark feel */
.lsn-q-option.correct,
.quiz-option.correct {
    background: rgba(26,125,82,0.08);
    border-color: var(--success);
    color: var(--success);
}
/* Incorrect answer — amber left-border, gentle, not red-flash */
.lsn-q-option.incorrect,
.quiz-option.incorrect {
    background: var(--amber-soft);
    border-color: var(--amber);
    color: var(--amber);
}
/* Selected but unrevealed */
.lsn-q-option.selected,
.quiz-option.selected {
    border-color: var(--accent);
    background: var(--accent-soft);
    color: var(--ink);
}
/* Disabled / locked state (after submission) */
.lsn-q-option:disabled,
.lsn-q-option.disabled,
.quiz-option:disabled,
.quiz-option.disabled {
    cursor: not-allowed; opacity: 0.65;
    pointer-events: none;
}
/* Revealed answer panel — subtle card, success accent */
.lsn-reveal-panel,
.quiz-reveal-panel {
    background: var(--surface);
    border: 1px solid var(--success);
    border-radius: 10px;
    padding: 16px 18px;
    margin-top: 14px;
    font-size: 0.86rem; color: var(--ink-soft); line-height: 1.7;
}
.lsn-reveal-panel .reveal-answer,
.quiz-reveal-panel .reveal-answer {
    font-weight: 700; color: var(--success); margin-bottom: 6px;
    font-family: 'JetBrains Mono', monospace; font-size: 0.8rem;
}
/* Final result summary — for exam results page */
.lsn-result-summary,
.quiz-result-summary {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 22px 24px;
    text-align: center;
}
.lsn-result-summary .result-score {
    font-family: 'Fraunces', Georgia, serif;
    font-size: 2.4rem; font-weight: 600; color: var(--accent);
    letter-spacing: -0.02em;
}
.lsn-result-summary .result-label {
    font-size: 0.78rem; color: var(--muted);
    text-transform: uppercase; letter-spacing: 0.1em;
    margin-top: 4px;
}
/* Error-state result (failed) */
.lsn-result-summary.failed { border-color: var(--error); }
.lsn-result-summary.failed .result-score { color: var(--error); }