/* ===== Tricky Problem / Brain-break Puzzle Block ===== */

:root {
  --puz_bg: #fdf2f8;
  --puz_border: #db2777;
  --puz_title: #9d174d;
  --puz_text: #4a044e;
  --puz_radius: 14px;

  --puz_badge_bg: #db2777;
  --puz_badge_text: #ffffff;

  --puz_problem_bg: #ffffff;
  --puz_problem_border: #fbcfe8;

  --puz_section_bg: #ffffff;
  --puz_section_border: #f9a8d4;

  --puz_solution_accent: #7c3aed;
  --puz_solution_bg: #f5f3ff;
  --puz_solution_border: #c4b5fd;

  --puz_answer_accent: #059669;
  --puz_answer_bg: #ecfdf5;
  --puz_answer_border: #6ee7b7;

  --puz_chevron_color: #9d174d;
}

/* ---------- Container ---------- */
.lesson_puzzle {
  position: relative;
  background: var(--puz_bg);
  border: 2px solid var(--puz_border);
  border-radius: var(--puz_radius);
  padding: 20px 22px;
  margin: 26px 0;
  box-shadow: 0 4px 14px rgba(219, 39, 119, 0.15);
}

/* ---------- Badge ---------- */
.lesson_puzzle_badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  background: var(--puz_badge_bg);
  color: var(--puz_badge_text);
  padding: 4px 14px;
  border-radius: 100px;
  margin-bottom: 12px;
}

/* ---------- Title ---------- */
.lesson_puzzle_title {
  margin: 0 0 12px 0;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--puz_title);
}

/* ---------- Problem statement ---------- */
.lesson_puzzle_problem {
  background: var(--puz_problem_bg);
  border: 1px solid var(--puz_problem_border);
  border-radius: 10px;
  padding: 14px 18px;
  font-size: 1.08rem;
  line-height: 1.65;
  color: var(--puz_text);
  margin-bottom: 16px;
}

/* ---------- Shared collapsible section styling ---------- */
.lesson_puzzle_section {
  background: var(--puz_section_bg);
  border: 1px solid var(--puz_section_border);
  border-radius: 10px;
  margin-bottom: 10px;
  overflow: hidden;
}

.lesson_puzzle_section:last-child {
  margin-bottom: 0;
}

.lesson_puzzle_section summary {
  list-style: none;
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  font-weight: 700;
  font-size: 1rem;
}

.lesson_puzzle_section summary::-webkit-details-marker {
  display: none;
}

.lesson_puzzle_section summary::after {
  content: "";
  margin-left: auto;
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  background: currentColor;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E") no-repeat center / contain;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E") no-repeat center / contain;
  transition: transform 0.2s ease;
}

.lesson_puzzle_section[open] summary::after {
  transform: rotate(180deg);
}

.lesson_puzzle_section_body {
  padding: 0 16px 16px 16px;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--puz_text);
}

/* ---------- Solution variant (violet) ---------- */
.lesson_puzzle_solution {
  background: var(--puz_solution_bg);
  border-color: var(--puz_solution_border);
}
.lesson_puzzle_solution summary {
  color: var(--puz_solution_accent);
}

/* ---------- Answer variant (green) ---------- */
.lesson_puzzle_answer {
  background: var(--puz_answer_bg);
  border-color: var(--puz_answer_border);
}
.lesson_puzzle_answer summary {
  color: var(--puz_answer_accent);
}

/* ---------- Loading / error states (used by the loader script) ---------- */
.lesson_puzzle_loading,
.lesson_puzzle_error {
  font-size: 0.95rem;
  font-style: italic;
  color: var(--puz_text);
  opacity: 0.75;
}

.lesson_puzzle_error {
  color: #b91c1c;
  font-style: normal;
}

/* ---------- Mobile adaptation ---------- */
@media (max-width: 480px) {
  .lesson_puzzle {
    padding: 16px 16px;
  }
  .lesson_puzzle_title {
    font-size: 1.15rem;
  }
  .lesson_puzzle_problem {
    padding: 12px 14px;
    font-size: 1rem;
  }
}