/* ========== LESSON VIEWER ========== */
/* Renders inside #modalBody (the shared scene modal), which already scrolls. */

/* ----- launcher card on subject pages ----- */
.learn-launch {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #fff;
  border-radius: 20px;
  padding: 22px 24px;
  margin: 20px 0;
  box-shadow: 0 10px 30px rgba(102, 126, 234, 0.35);
}
.learn-launch h3 { margin: 0 0 4px; font-size: 1.5rem; }
.learn-launch p  { margin: 0 0 14px; opacity: 0.92; }
.learn-btn {
  background: #fff;
  color: #5a3fc0;
  border: none;
  border-radius: 30px;
  padding: 11px 20px;
  margin: 5px 8px 0 0;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
}
.learn-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(0,0,0,0.2); }

/* ----- This Week board + launcher (replaces the lesson reader) ----- */
.this-week {
  background: #fff;
  border: 2px solid #e6e0ff;
  border-radius: 20px;
  padding: 20px 24px;
  margin: 20px 0;
  box-shadow: 0 8px 24px rgba(102, 126, 234, 0.12);
}
.this-week h3 { margin: 0 0 8px; color: #5a3fc0; font-size: 1.4rem; }
.tw-note { color: #777; font-size: 0.9rem; margin: 0 0 10px; }
.tw-topic { margin: 4px 0 10px; color: #333; }
.tw-list { margin: 0 0 14px; padding-left: 20px; line-height: 1.55; }
.tw-list li { margin: 6px 0; color: #333; }
.tw-launch { display: flex; flex-wrap: wrap; gap: 12px; }
.tw-btn {
  flex: 1; min-width: 200px; text-align: center; padding: 12px 18px;
  border-radius: 30px; font-weight: 700; text-decoration: none; color: #fff;
  transition: transform 0.15s;
}
.tw-btn:hover { transform: translateY(-2px); }
.tw-gc   { background: linear-gradient(135deg, #4285f4 0%, #2b6cd4 100%); }
.tw-khan { background: linear-gradient(135deg, #14bf96 0%, #0d9488 100%); }

/* ----- index: list of lessons ----- */
.lesson-index h2 { color: #5a3fc0; margin: 0 0 4px; }
.lesson-sub { color: #666; margin: 0 0 16px; }
.lesson-list { display: flex; flex-direction: column; gap: 10px; }
.lesson-item {
  display: block;
  width: 100%;
  text-align: left;
  background: #f7f5ff;
  border: 2px solid #e6e0ff;
  border-radius: 14px;
  padding: 12px 14px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
}
.lesson-item:hover { border-color: #a99bf0; background: #f0ecff; transform: translateX(3px); }
.li-title { display: block; font-weight: 700; font-size: 1.08rem; color: #3d2f7a; }
.li-tag {
  display: inline-block; margin-top: 3px; font-size: 0.72rem; font-weight: 700;
  color: #5a3fc0; background: #e6e0ff; border-radius: 20px; padding: 2px 9px;
}
.li-idea {
  display: block; margin-top: 5px; color: #555; font-size: 0.9rem; line-height: 1.4;
}

/* ----- hub of sets (history room) ----- */
.lesson-sets { display: flex; flex-direction: column; gap: 12px; }
.lesson-set {
  display: flex; align-items: center; gap: 14px; width: 100%; text-align: left;
  background: #f7f5ff; border: 2px solid #e6e0ff; border-radius: 16px;
  padding: 16px; cursor: pointer; transition: border-color 0.15s, transform 0.1s;
}
.lesson-set:hover:not([disabled]) { border-color: #a99bf0; transform: translateX(3px); }
.lesson-set[disabled] { opacity: 0.5; cursor: default; }
.ls-emoji { font-size: 2rem; }
.ls-text b { display: block; font-size: 1.1rem; color: #3d2f7a; }
.ls-text small { color: #777; }

/* ----- one lesson ----- */
.lesson-head { margin-bottom: 8px; }
.lesson-back {
  background: #ece8ff; color: #5a3fc0; border: none; border-radius: 20px;
  padding: 7px 14px; font-size: 0.9rem; font-weight: 700; cursor: pointer;
}
.lesson-back:hover { background: #ddd6ff; }
.lesson-title { color: #3d2f7a; margin: 12px 0 4px; }
.lesson-tag {
  display: inline-block; font-size: 0.78rem; font-weight: 700; color: #5a3fc0;
  background: #e6e0ff; border-radius: 20px; padding: 3px 12px;
}
.lesson-big {
  background: #fff8e1; border-left: 5px solid #f6c744; border-radius: 10px;
  padding: 12px 14px; margin: 14px 0; line-height: 1.5; color: #4a4a2a;
}
.lesson-links { display: flex; flex-wrap: wrap; gap: 10px; margin: 4px 0 6px; }
.lesson-khan, .lesson-gc {
  display: inline-block; padding: 10px 16px; color: #fff;
  border-radius: 30px; font-weight: 700; text-decoration: none;
  transition: transform 0.15s;
}
.lesson-khan { background: linear-gradient(135deg, #14bf96 0%, #0d9488 100%);
  box-shadow: 0 4px 12px rgba(13, 148, 136, 0.3); }
.lesson-gc   { background: linear-gradient(135deg, #4285f4 0%, #2b6cd4 100%);
  box-shadow: 0 4px 12px rgba(66, 133, 244, 0.3); }
.lesson-khan:hover, .lesson-gc:hover { transform: translateY(-2px); }

.lesson-explain { line-height: 1.65; color: #333; margin: 14px 0; }
.lesson-h { color: #5a3fc0; margin: 22px 0 8px; font-size: 1.2rem; }

.lesson-ex {
  background: #f2fbf6; border: 1px solid #cdeede; border-radius: 12px;
  padding: 12px 14px; margin: 10px 0; line-height: 1.55;
}
.ex-problem { font-weight: 700; color: #1f7a54; margin: 0 0 6px; }
.lesson-ex ol { margin: 6px 0 6px 18px; }
.lesson-ex li { margin: 3px 0; }
.ex-answer { margin: 6px 0 0; color: #1f7a54; }

.lesson-facts { line-height: 1.6; margin: 8px 0 8px 18px; }
.lesson-facts li { margin: 5px 0; }

.lesson-miss {
  background: #fff3f0; border-left: 5px solid #ff8a65; border-radius: 10px;
  padding: 10px 14px; margin: 10px 0; line-height: 1.5;
}
.miss-what { font-weight: 700; color: #c0492b; margin: 0 0 5px; }
.miss-why, .miss-fix { margin: 4px 0; font-size: 0.94rem; color: #444; }

.lesson-check {
  background: #f5f3ff; border: 1px solid #e0d9ff; border-radius: 10px;
  padding: 10px 14px; margin: 8px 0;
}
.lesson-check summary {
  cursor: pointer; font-weight: 700; color: #3d2f7a; list-style: none;
}
.lesson-check summary::before { content: '❓ '; }
.lesson-check[open] summary::before { content: '✅ '; }
.lesson-check p { margin: 8px 0 0; color: #1f7a54; line-height: 1.5; }

.lesson-note {
  border-radius: 12px; padding: 12px 14px; margin: 12px 0; line-height: 1.55;
}
.note-hands  { background: #eef6ff; border-left: 5px solid #5b9bff; color: #24425f; }
.note-parent { background: #fdf0f7; border-left: 5px solid #e07fb4; color: #5a2c47; }

.lesson-prereq { color: #888; font-size: 0.86rem; margin: 16px 0 0; }
.lesson-foot { margin-top: 20px; text-align: center; }