/* =====================================================
   Lesson Page — Layout & Component Styles
   Dark theme is inherited from main.css
   ===================================================== */

/* Lesson headings use foreground colour so light mode works correctly */
h1, h2, h3, h4, h5, h6 { color: var(--fg); }

/* =====================================================
   LESSON LAYOUT — Sidebar + body
   ===================================================== */

.lesson-nav {
  position: fixed;
  top: var(--nav-h); left: 0;
  width: 220px;
  height: calc(100vh - var(--nav-h));
  background: var(--bg);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 1.5rem 1rem 2rem;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.lesson-nav-logo {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--fg);
  text-decoration: none;
  margin-bottom: 1.5rem;
  display: block;
  letter-spacing: -0.01em;
  opacity: 0.9;
}
.lesson-nav-logo:hover { opacity: 1; color: var(--amber); }

.lesson-nav-lesson {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--fg);
  line-height: 1.4;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.lesson-nav-toc {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
  flex: 1;
}

.lesson-nav-item {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.45rem 0.6rem;
  border-radius: 6px;
  font-size: 0.8125rem;
  color: var(--fg-muted);
  text-decoration: none;
  transition: color 0.15s, background 0.15s;
  line-height: 1.3;
}
.lesson-nav-item:hover { color: var(--fg); background: var(--bg-subtle); opacity: 1; }
.lesson-nav-item.active { color: var(--amber); background: rgba(232,197,71,0.1); }
.lesson-nav-item.active:hover { color: var(--amber); }

.lesson-nav-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px; height: 18px;
  background: var(--bg-subtle);
  border-radius: 4px;
  font-size: 0.6875rem;
  font-weight: 700;
  flex-shrink: 0;
  color: var(--fg);
}
.lesson-nav-item.active .lesson-nav-num {
  background: rgba(232,197,71,0.2);
  color: var(--amber);
}

.lesson-nav-back {
  display: block;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--fg-muted);
  text-decoration: none;
  transition: color 0.15s;
}
.lesson-nav-back:hover { color: var(--fg-muted); }

/* Main body */
.lesson-body {
  margin-left: 220px;
  padding-top: var(--nav-h);
  min-height: 100vh;
  background: var(--body-bg);
}

/* Content column */
.lesson-content {
  max-width: 700px;
  margin: 0 auto;
  padding: 3rem 2.5rem 6rem;
}

/* Loading state */
#lesson-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  gap: 1rem;
  color: var(--fg-muted);
  font-size: 0.875rem;
}

/* Mobile: sidebar collapses to horizontal top bar */
@media (max-width: 768px) {
  .lesson-nav {
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    width: 100%;
    height: auto;
    flex-direction: row;
    flex-wrap: nowrap;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0.75rem 1rem;
    border-right: none;
    border-bottom: 1px solid var(--border);
    z-index: 150;
    gap: 0.5rem;
    align-items: center;
  }
  .lesson-nav-logo { margin-bottom: 0; white-space: nowrap; flex-shrink: 0; }
  .lesson-nav-lesson { display: none; }
  .lesson-nav-toc { flex-direction: row; flex: none; gap: 0.25rem; }
  .lesson-nav-back { margin-top: 0; padding-top: 0; border-top: none; white-space: nowrap; }

  .lesson-body { margin-left: 0; padding-top: calc(var(--nav-h) + 56px); }
  .lesson-content { padding: 2rem 1.25rem 4rem; }
}

/* =====================================================
   STICKY PROGRESS BAR
   ===================================================== */

.lesson-progress-sticky {
  position: fixed;
  top: var(--nav-h);
  left: 220px;
  right: 0;
  height: 3px;
  background: var(--bg-muted);
  z-index: 150;
}

.lesson-progress-sticky-fill {
  height: 100%;
  width: 0%;
  background: var(--amber);
  transition: width 0.2s ease;
}

@media (max-width: 768px) {
  .lesson-progress-sticky {
    left: 0;
    top: calc(var(--nav-h) + 56px); /* main nav + mobile horizontal lesson nav */
  }
}

/* =====================================================
   LESSON HEADER
   ===================================================== */

.lesson-header {
  padding-bottom: var(--sp-6);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--sp-7);
}
.lesson-header-meta {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-wrap: wrap;
  margin-bottom: var(--sp-4);
  font-size: var(--fs-3);
  color: var(--fg-muted);
}
.lesson-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--sp-5);
  color: var(--fg);
}
.lesson-progress-row {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}
.lesson-progress-label {
  font-size: var(--fs-2);
  color: var(--fg-muted);
  white-space: nowrap;
}

/* =====================================================
   SECTION DIVIDER
   ===================================================== */

.lesson-section { margin-bottom: var(--sp-9); }
.lesson-section-heading {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-5);
  padding-bottom: var(--sp-3);
  border-bottom: 1px solid var(--border);
}
.lesson-section-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px; height: 26px;
  background: var(--amber);
  color: #0f1117;
  font-size: var(--fs-2);
  font-weight: 800;
  border-radius: 6px;
  flex-shrink: 0;
}
.lesson-section-heading h2 {
  font-size: var(--fs-5);
  margin: 0;
  color: var(--fg);
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* =====================================================
   CONTEXT
   ===================================================== */

.context-text {
  font-size: var(--fs-6);
  line-height: 1.85;
  padding: var(--sp-6);
  background: var(--bg);
  border: 1px solid var(--border);
  border-left: 3px solid var(--amber);
  border-radius: 10px;
  margin-bottom: var(--sp-3);
  color: var(--fg);
}
.context-help {
  font-size: var(--fs-3);
  color: var(--fg-muted);
  margin-top: var(--sp-2);
}

/* =====================================================
   VOCAB CARDS
   ===================================================== */

.vocab-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: var(--sp-5);
  margin-bottom: var(--sp-4);
}
.vocab-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--sp-4);
  margin-bottom: var(--sp-3);
}
.vocab-card-word {
  font-size: var(--fs-7);
  font-weight: 700;
  color: var(--fg);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--sp-1);
}
.vocab-card-pos {
  font-size: var(--fs-2);
  color: var(--fg-muted);
  font-style: italic;
}
.vocab-card-definition {
  font-size: var(--fs-4);
  color: var(--fg);
  margin-bottom: var(--sp-3);
  line-height: 1.65;
}
.vocab-card-context {
  font-size: var(--fs-3);
  color: var(--fg);
  font-style: italic;
  background: rgba(232,197,71,0.06);
  border-left: 2px solid rgba(232,197,71,0.4);
  padding: var(--sp-2) var(--sp-4);
  border-radius: 0 6px 6px 0;
  margin-bottom: var(--sp-3);
  line-height: 1.55;
}
.vocab-card-register {
  font-size: var(--fs-2);
  color: var(--fg-muted);
  margin-bottom: var(--sp-3);
  line-height: 1.5;
}
.vocab-card-register strong { color: var(--fg); }
.vocab-card-collocations {
  margin-bottom: var(--sp-4);
}
.vocab-card-collocations-label {
  font-size: var(--fs-2);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--amber);
  margin-bottom: var(--sp-2);
}
.vocab-colloc-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
}
.vocab-colloc-chip {
  font-size: var(--fs-2);
  color: var(--fg);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: var(--sp-1) var(--sp-3);
  white-space: nowrap;
}
.vocab-card-examples {
  list-style: none;
  border-left: 2px solid rgba(232,197,71,0.3);
  padding-left: var(--sp-4);
  margin-bottom: var(--sp-4);
}
.vocab-card-example {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  padding: var(--sp-2) 0;
  border-bottom: 1px solid var(--border-muted);
  font-size: var(--fs-4);
  color: var(--fg);
  font-style: italic;
  min-height: 44px;
}
.vocab-card-example:last-child { border-bottom: none; }
.vocab-card-actions {
  display: flex;
  gap: var(--sp-2);
  flex-wrap: wrap;
  padding-top: var(--sp-3);
  border-top: 1px solid var(--border-muted);
  align-items: center;
}
.vocab-save-note {
  font-size: var(--fs-2);
  color: var(--fg-muted);
  margin-left: auto;
}

/* =====================================================
   QUIZ
   ===================================================== */

.quiz-instruction {
  font-size: var(--fs-3);
  color: var(--fg-muted);
  margin-bottom: var(--sp-5);
  margin-top: calc(-1 * var(--sp-3));
}
.quiz-question {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: var(--sp-4);
  margin-bottom: var(--sp-4);
}
.quiz-question-text {
  font-size: var(--fs-4);
  font-weight: 500;
  margin-bottom: var(--sp-3);
  color: var(--fg);
}
.quiz-explanation {
  display: none;
  font-size: var(--fs-3);
  color: var(--fg);
  padding: var(--sp-2) var(--sp-3);
  background: rgba(232,197,71,0.08);
  border-left: 3px solid var(--amber);
  border-radius: 0 6px 6px 0;
  margin-top: var(--sp-2);
  line-height: 1.5;
}

/* =====================================================
   FINAL QUIZ CONTAINER
   ===================================================== */

.final-quiz {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: var(--sp-5);
}
.final-quiz h3 { margin-bottom: var(--sp-2); color: var(--fg); }
.final-quiz-result {
  text-align: center;
  padding: var(--sp-7) var(--sp-5);
  border-top: 1px solid var(--border);
  margin-top: var(--sp-5);
}
.final-quiz-score {
  font-size: var(--fs-8);
  font-weight: 700;
  color: var(--amber);
  margin-bottom: var(--sp-2);
}
.final-quiz-message {
  font-size: var(--fs-4);
  color: var(--fg);
  margin-bottom: var(--sp-4);
}

/* =====================================================
   UPGRADE GATE
   ===================================================== */

.upgrade-banner {
  background: rgba(232,197,71,0.06);
  border: 1px solid rgba(232,197,71,0.2);
  border-left: 3px solid var(--amber);
}
.upgrade-banner h3 { color: var(--fg); }
.upgrade-banner p { color: var(--fg-muted); }

/* =====================================================
   WORD PANEL — slide-in detail
   ===================================================== */

.word-panel-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  color: var(--fg-muted);
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  z-index: 10;
  flex-shrink: 0;
}
.word-panel-close:hover {
  background: var(--border);
  color: var(--fg);
}

/* =====================================================
   ACTIVE PRACTICE
   ===================================================== */

.ap-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: var(--sp-5);
}
.ap-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  margin-bottom: var(--sp-5);
  flex-wrap: wrap;
}
.ap-part-label {
  font-size: var(--fs-2);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--amber);
}
.ap-progress-row {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}
.ap-progress-bar { width: 100px; }
.ap-progress-count {
  font-size: var(--fs-2);
  color: var(--fg-muted);
  white-space: nowrap;
}

/* Prompts */
.ap-prompt {
  font-size: var(--fs-5);
  line-height: 1.65;
  color: var(--fg);
  margin-bottom: var(--sp-5);
}
.ap-cloze {
  font-size: var(--fs-5);
  line-height: 1.85;
  color: var(--fg);
  margin-bottom: var(--sp-5);
}
.ap-blank {
  display: inline-block;
  min-width: 72px;
  border-bottom: 2px solid var(--amber);
  color: var(--amber);
  margin: 0 2px;
  vertical-align: baseline;
}
.ap-situation {
  background: rgba(232,197,71,0.05);
  border-left: 3px solid var(--amber);
  border-radius: 0 8px 8px 0;
  padding: var(--sp-4) var(--sp-5);
  margin-bottom: var(--sp-5);
}
.ap-situation-text {
  color: var(--fg);
  font-size: var(--fs-4);
  line-height: 1.7;
  margin-bottom: var(--sp-3);
}
.ap-situation-quote {
  color: var(--fg);
  font-size: var(--fs-5);
  line-height: 1.7;
  margin: 0;
  font-style: italic;
}

/* Option grid */
.ap-options {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}
.ap-option {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: var(--sp-3) var(--sp-4);
  text-align: left;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: var(--fs-4);
  color: var(--fg);
  line-height: 1.4;
  transition: border-color 0.12s, background 0.12s;
}
.ap-option:hover:not(:disabled) {
  border-color: var(--fg-subtle);
  background: var(--bg-muted);
}
.ap-option--correct {
  border-color: var(--green) !important;
  background: rgba(34,197,94,0.1) !important;
  color: var(--green) !important;
}
.ap-option--wrong {
  border-color: #ef4444 !important;
  background: rgba(239,68,68,0.1) !important;
  color: #ef4444 !important;
}
.ap-option--dim { opacity: 0.35; }
.ap-option:disabled { cursor: default; }

/* Reveal panel */
.ap-reveal {
  margin-top: var(--sp-5);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--border);
}
.ap-reveal-inline {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}
.ap-verdict {
  font-size: var(--fs-4);
  font-weight: 700;
}
.ap-verdict--correct { color: var(--green); }
.ap-verdict--wrong   { color: #ef4444; }

/* Part transition screen */
.ap-transition {
  text-align: center;
  padding: var(--sp-8) var(--sp-5);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.ap-transition-prev {
  font-size: var(--fs-3);
  color: var(--fg-muted);
  margin-bottom: var(--sp-5);
}
.ap-transition-next-label {
  font-size: var(--fs-2);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: var(--sp-2);
}
.ap-transition-title {
  font-size: var(--fs-6);
  margin-bottom: var(--sp-2);
}
.ap-transition-desc {
  font-size: var(--fs-4);
  color: var(--fg);
  margin: var(--sp-2) 0 var(--sp-6);
  line-height: 1.6;
}

/* Summary screen */
.ap-summary {
  padding: var(--sp-8) var(--sp-5);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-align: center;
}
.ap-summary-score {
  font-size: 3rem;
  font-weight: 800;
  color: var(--amber);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: var(--sp-3);
}
.ap-summary-message {
  font-size: var(--fs-4);
  color: var(--fg);
  line-height: 1.6;
  margin-bottom: var(--sp-6);
  max-width: 36ch;
  margin-left: auto;
  margin-right: auto;
}
.ap-summary-breakdown {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: var(--sp-4);
  margin-bottom: var(--sp-6);
  text-align: left;
}
.ap-summary-row {
  display: flex;
  justify-content: space-between;
  gap: var(--sp-4);
  padding: var(--sp-2) 0;
  border-bottom: 1px solid var(--border-muted);
  font-size: var(--fs-3);
  color: var(--fg);
}
.ap-summary-row:last-child { border-bottom: none; }
.ap-summary-row span:last-child {
  font-weight: 700;
  color: var(--fg);
  white-space: nowrap;
}
.ap-no-review {
  font-size: var(--fs-3);
  color: var(--fg-muted);
  margin-bottom: var(--sp-6);
}

/* Words to review */
.ap-words-to-review {
  margin-bottom: var(--sp-6);
  text-align: left;
}
.ap-words-to-review h4 {
  font-size: var(--fs-4);
  font-weight: 600;
  color: var(--fg);
  margin-bottom: var(--sp-3);
  text-align: center;
}
.ap-review-cards {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  margin-bottom: var(--sp-4);
}
.ap-review-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: var(--sp-3) var(--sp-4);
}
.ap-review-card-word {
  font-size: var(--fs-4);
  font-weight: 700;
  color: var(--fg);
  margin-bottom: var(--sp-1);
}
.ap-review-card-def {
  font-size: var(--fs-3);
  color: var(--fg);
  line-height: 1.5;
}
.ap-add-queue-btn {
  width: 100%;
}
.ap-summary-actions {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  align-items: center;
}

/* =====================================================
   VOCABULARY STEP-THROUGH CARDS
   ===================================================== */

.vc-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: var(--sp-6);
}
.vc-card-header {
  display: flex;
  justify-content: flex-end;
  margin-bottom: var(--sp-4);
}
.vc-progress {
  font-size: var(--fs-2);
  font-weight: 600;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.vc-word {
  font-size: 2rem;
  font-weight: 700;
  color: var(--amber);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: var(--sp-2);
}
.vc-pos {
  font-size: var(--fs-2);
  color: var(--fg-muted);
  font-style: italic;
  margin-bottom: var(--sp-4);
}
.vc-definition {
  font-size: 1.1rem;
  color: var(--fg);
  line-height: 1.65;
  margin-bottom: var(--sp-5);
}
.vc-example {
  font-size: var(--fs-4);
  color: var(--fg);
  font-style: italic;
  background: rgba(232,197,71,0.06);
  border-left: 3px solid var(--amber);
  border-radius: 0 6px 6px 0;
  padding: var(--sp-3) var(--sp-4);
  margin-bottom: var(--sp-5);
  line-height: 1.6;
}
.vc-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}
.vc-transition {
  text-align: center;
  padding: var(--sp-8) var(--sp-5);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.vc-transition-title {
  font-size: var(--fs-6);
  font-weight: 700;
  color: var(--fg);
  margin-bottom: var(--sp-3);
}
.vc-transition-sub {
  font-size: var(--fs-4);
  color: var(--fg-muted);
  line-height: 1.6;
  margin-bottom: var(--sp-6);
  max-width: 38ch;
  margin-left: auto;
  margin-right: auto;
}
.vc-test-wrap {
  text-align: center;
  padding-top: var(--sp-6);
}

/* =====================================================
   RESPONSIVE
   ===================================================== */

@media (max-width: 640px) {
  .context-text { padding: var(--sp-4); font-size: var(--fs-5); }
  .vocab-colloc-chips { gap: var(--sp-1); }
}

/* =====================================================
   PASSAGE AUDIO PLAYER
   ===================================================== */

.passage-player {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: var(--sp-3) var(--sp-4);
  margin-bottom: var(--sp-4);
  text-decoration: none;
  color: inherit;
}

.passage-player--locked {
  cursor: pointer;
  opacity: 0.85;
  transition: opacity 0.15s;
}
.passage-player--locked:hover { opacity: 1; }

.passage-player-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  min-width: 44px;
  border-radius: 50%;
  background: var(--amber);
  border: none;
  cursor: pointer;
  color: #0f1117;
  transition: background 0.15s, transform 0.1s;
  flex-shrink: 0;
}
.passage-player-btn:hover:not(:disabled) { background: #f5d55a; transform: scale(1.05); }
.passage-player-btn:active:not(:disabled) { transform: scale(0.97); }
.passage-player-btn:disabled { cursor: default; }

.passage-player-btn--locked {
  background: rgba(232,197,71,0.15);
  color: var(--amber);
}
.passage-player-btn--locked:hover { background: rgba(232,197,71,0.25); transform: none; }

.passage-player-body {
  flex: 1;
  min-width: 0;
}

.passage-player-title {
  font-size: var(--fs-3);
  font-weight: 600;
  color: var(--fg);
  margin-bottom: var(--sp-2);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.passage-player-badge {
  font-size: var(--fs-1);
  font-weight: 700;
  color: #0f1117;
  background: var(--amber);
  border-radius: 4px;
  padding: 2px 6px;
  letter-spacing: 0.04em;
  flex-shrink: 0;
}

.passage-player-track {
  height: 12px;
  display: flex;
  align-items: center;
  cursor: pointer;
  position: relative;
}
.passage-player-track--locked { cursor: default; }
.passage-player-track::before {
  content: '';
  position: absolute;
  left: 0; right: 0;
  height: 4px;
  background: var(--bg-subtle);
  border-radius: 2px;
}
.passage-player-fill {
  position: absolute;
  left: 0;
  height: 4px;
  background: var(--amber);
  border-radius: 2px;
  width: 0%;
  transition: width 0.1s linear;
  pointer-events: none;
}

.pp-spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(15,17,23,0.3);
  border-top-color: #0f1117;
  border-radius: 50%;
  animation: pp-spin 0.7s linear infinite;
}
@keyframes pp-spin { to { transform: rotate(360deg); } }

/* =====================================================
   GATED PASSAGE PREVIEW
   ===================================================== */

.gated-passage-wrap {
  position: relative;
}

/* Blur overlay: fades from clear at top to blurred at bottom */
.gated-blur-cover {
  position: absolute;
  inset: 0;
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  -webkit-mask-image: linear-gradient(to bottom, transparent 35%, black 80%);
  mask-image: linear-gradient(to bottom, transparent 35%, black 80%);
  pointer-events: none;
}

/* Hard fade to page background at very bottom edge */
.gated-passage-wrap::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 72px;
  background: linear-gradient(to bottom, transparent, var(--body-bg, #0f1117));
  pointer-events: none;
  z-index: 1;
}

/* =====================================================
   SECONDARY HIGHLIGHTS — dotted underline + tooltip
   ===================================================== */

.sec-mark {
  position: relative;
  border-bottom: 1.5px dotted var(--amber, #e8c547);
  cursor: pointer;
  display: inline;
}

.sec-tooltip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-elevated, #1e2130);
  border: 1px solid var(--border, rgba(255,255,255,0.12));
  border-left: 3px solid var(--amber, #e8c547);
  color: var(--fg, #f0f0f0);
  font-size: 0.8rem;
  line-height: 1.5;
  padding: 10px 12px 10px;
  border-radius: 6px;
  width: 220px;
  white-space: normal;
  z-index: 100;
  pointer-events: auto;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
}

.sec-tooltip-phrase {
  font-weight: 600;
  color: var(--amber, #e8c547);
  margin-bottom: 4px;
  font-size: 0.8rem;
}

.sec-tooltip-def {
  color: var(--fg-muted, #9ca3af);
  margin-bottom: 10px;
  font-size: 0.78rem;
  line-height: 1.5;
}

.sec-save-btn {
  display: block;
  width: 100%;
  padding: 6px 10px;
  background: var(--amber, #e8c547);
  color: #1a1a1a;
  border: none;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  line-height: 1.4;
  transition: opacity 0.15s;
}

.sec-save-btn:hover:not(:disabled) { opacity: 0.88; }
.sec-save-btn:disabled { cursor: default; }

/* =====================================================
   STAGED LESSON — Sidebar stage indicators
   ===================================================== */

.lesson-stage-item {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.45rem 0.6rem;
  border-radius: 6px;
  font-size: 0.8125rem;
  color: var(--fg-muted);
  line-height: 1.3;
  user-select: none;
}
.lesson-stage-item.active {
  color: var(--amber);
  background: rgba(232,197,71,0.1);
}
.lesson-stage-item.active .lesson-nav-num {
  background: rgba(232,197,71,0.2);
  color: var(--amber);
}
.lesson-stage-item.done {
  color: var(--fg-muted);
  opacity: 0.6;
}
.lesson-stage-item.done .lesson-nav-num {
  background: rgba(34,197,94,0.15);
  color: var(--green, #22c55e);
}

/* =====================================================
   STAGED LESSON — Start screen
   ===================================================== */

.ls-start-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--sp-7) var(--sp-6);
  margin-top: var(--sp-2);
}
.ls-start-desc {
  font-size: var(--fs-5);
  color: var(--fg);
  line-height: 1.65;
  margin-bottom: var(--sp-5);
}
.ls-register {
  font-size: var(--fs-3);
  color: var(--fg-muted);
  margin-bottom: var(--sp-5);
  line-height: 1.5;
}
.ls-register a { color: var(--amber); text-decoration: underline; }

/* =====================================================
   STAGED LESSON — Stage footer (next button)
   ===================================================== */

.ls-stage-footer {
  padding: var(--sp-6) 0 var(--sp-4);
  text-align: right;
}

/* =====================================================
   STAGED LESSON — End screen
   ===================================================== */

.ls-end-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--sp-7) var(--sp-6);
  margin-top: var(--sp-2);
}
.ls-end-msg {
  font-size: var(--fs-7);
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.02em;
  margin-bottom: var(--sp-5);
}
.ls-end-save-section {
  margin-bottom: var(--sp-5);
}
.ls-end-save-label {
  font-size: var(--fs-3);
  font-weight: 600;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--sp-3);
}
.ls-end-words {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
}
.ls-end-word-row {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: var(--sp-1) var(--sp-3);
  font-size: var(--fs-3);
  color: var(--fg);
}
.ls-saved-check {
  color: var(--green, #22c55e);
  font-weight: 700;
  font-size: 0.75rem;
}
.ls-end-actions {
  display: flex;
  gap: var(--sp-3);
  flex-wrap: wrap;
  align-items: center;
  padding-top: var(--sp-5);
  border-top: 1px solid var(--border);
  margin-top: var(--sp-5);
}