/* ============================================================
   Lesson Activities — shared styles for all interactive
   activity types (quiz, sort-buckets, count-points,
   match-pairs, order-sequence, flip-cards, stepper).

   Every activity is scoped under .lesson-activity so these
   rules never leak into site chrome. Colors follow the
   DESIGN GUIDELINES Material palette (senior-friendly,
   WCAG AA checked).
   ============================================================ */

.lesson-activity {
  --la-ink: #212121;          /* Grey 900 */
  --la-muted: #616161;        /* Grey 700 — 5.3:1 on grey 200 */
  --la-line: #CFD8DC;         /* Blue Grey 100 — visible edge on white */
  --la-paper: #FFFFFF;
  --la-panel: #F5F5F5;        /* Grey 100 */
  --la-orange: #FB8C00;       /* Orange 600 — lesson-section accent */
  --la-teal: #00796B;         /* Teal 700 — 5.3:1 on white (text) */
  --la-teal-line: #00BFA5;    /* site accent teal — borders/outlines */
  --la-teal-soft: #E0F2F1;
  --la-amber: #FFC107;        /* Amber 500 — primary action */
  --la-amber-dark: #FFA000;
  --la-green: #2E7D32;        /* success text */
  --la-green-line: #4CAF50;   /* Green 500 — check */
  --la-green-bg: #E8F5E9;
  --la-red: #D32F2F;          /* Red 700 — 5:1 on white */
  --la-red-line: #EF9A9A;
  --la-red-bg: #FFEBEE;
  --la-gold: #BF360C;         /* "reasonable" verdict */
  --la-gold-bg: #FFF8E1;
  --la-radius: 12px;
  --la-pad: clamp(18px, 3vw, 28px);

  max-width: 720px;
  margin: 1.5rem auto 2.5rem;
  padding: var(--la-pad);
  /* Soft teal fill + teal edge so panels don't melt into the grey page
     (DESIGN GUIDELINES teal / amber palette; contrast inspired by the
     tinted mock panels, not white-on-grey). */
  background: var(--la-teal-soft);
  border: 2px solid var(--la-teal-line);
  border-left: 6px solid var(--la-teal);
  border-radius: 16px;
  box-shadow: 0 6px 18px rgba(0, 121, 107, 0.12);
  color: var(--la-ink);
  font-family: "Roboto", system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: var(--senior-body-size, 1.25rem); /* Match lesson body text size */
  line-height: 1.6;
}
.lesson-activity *, .lesson-activity *::before, .lesson-activity *::after { box-sizing: border-box; }
.lesson-activity :focus-visible { outline: 2px solid var(--la-teal); outline-offset: 2px; }
.lesson-activity button { font: inherit; color: inherit; }

/* ---- Shared primitives ---- */

.la-prompt {
  margin: 0 0 14px;
  font-size: 1.35rem; /* One step above the activity body text */
  font-weight: 700;
  line-height: 1.4;
  color: var(--la-teal);
}

.la-progress {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(0, 121, 107, 0.12);
  color: var(--la-teal);
  font-size: 0.9rem;
  font-weight: 700;
}

.la-auction {
  margin: 0 0 14px;
  font-size: 1.05rem;
}
.la-auction strong {
  background: var(--la-teal-soft);
  padding: 4px 9px;
  border-radius: 8px;
  margin-right: 6px;
  display: inline-block;
}

/* typography-improvements-test.css gives every ul/ol a 4rem right margin;
   activity panels manage their own spacing, so cancel it here (the higher
   specificity wins the !important tie). */
.lesson-activity ul,
.lesson-activity ol {
  margin-right: 0 !important;
}

.la-hand {
  list-style: none;
  margin: 0 0 16px;
  padding: 14px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 18px;
  background: var(--la-paper);
  border: 1px solid var(--la-line);
  border-left: 4px solid var(--la-teal-line);
  border-radius: var(--la-radius);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.06);
}
.la-hand li { margin: 0; white-space: nowrap; font-variant-numeric: tabular-nums; }
.la-hand .la-sym { font-size: 1.35rem; display: inline-block; width: 30px; }
.la-hand.la-hand--inline { margin: 0; }

/* Labeled hands side by side (Dummy / You, Hand A / Hand B) */
.la-hands { display: flex; gap: 16px; flex-wrap: wrap; margin: 0 0 16px; }
.la-hands .la-hand-fig { flex: 1 1 220px; margin: 0; }
.la-hand-label { margin: 0 0 6px; font-weight: 700; font-size: 0.95rem; color: var(--la-muted); }
/* Half-width cards can't fit two suits per row (long holdings overflow),
   so side-by-side hands list one suit per line. */
.la-hands .la-hand { max-width: none; grid-template-columns: 1fr; }

/* Single-suit combination (dummy over declarer) */
.la-combo {
  display: grid;
  gap: 10px;
  margin: 0 0 16px;
  padding: 14px 16px;
  background: var(--la-paper);
  border: 1px solid var(--la-line);
  border-left: 4px solid var(--la-teal-line);
  border-radius: var(--la-radius);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.06);
}
.la-combo-row { display: flex; align-items: center; gap: 12px; }
.la-combo-label { min-width: 90px; font-weight: 700; font-size: 0.95rem; color: var(--la-muted); }
.la-combo-cards { font-size: 1.2rem; font-variant-numeric: tabular-nums; }
.la-combo .la-sym { font-size: 1.3rem; }

.la-answers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0 0 4px;
}
.la-answer {
  text-align: left;
  border: 2px solid var(--la-line);
  border-radius: var(--la-radius);
  padding: 11px 13px;
  min-height: 44px;
  background: var(--la-paper);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.la-answer:hover:not(:disabled) { border-color: var(--la-teal-line); background: #F7FFFE; }
.la-answer:disabled { cursor: default; }
.la-answer.selected { outline: 3px solid rgba(0, 121, 107, 0.25); }
.la-answer.correct { border-color: var(--la-green-line); background: var(--la-green-bg); }
.la-answer.wrong { border-color: var(--la-red-line); background: var(--la-red-bg); }
.la-answer.correct::after { content: "\2713"; float: right; font-weight: 700; color: var(--la-green); margin-left: 8px; }
.la-answer.wrong::after { content: "\2715"; float: right; font-weight: 700; color: var(--la-red); margin-left: 8px; }
.la-answers--stack { grid-template-columns: 1fr; }

/* Activity embedded inside a coloured exercise panel (e.g. .bright-block).
   Stay white so the panel reads clearly on the orange exercise block. */
.lesson-activity.lesson-activity--onbright {
  margin: 0 auto;
  background: var(--la-paper);
  border-color: rgba(255, 255, 255, 0.55);
  border-left-color: var(--la-amber);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);
}
.lesson-activity.lesson-activity--onbright .la-prompt {
  color: var(--la-ink);
}

/* Stepper: deep-teal header band (site teal standing in for the mock's
   solid header), white body area below. */
.lesson-activity.lesson-activity--stepper {
  padding-top: 0;
  background: var(--la-paper);
  border-left-width: 2px;
  border-left-color: var(--la-teal-line);
  overflow: hidden;
}
.lesson-activity--stepper .la-activity-header {
  background: var(--la-teal-soft);
  border-bottom: 2px solid var(--la-teal-line);
  margin: 0 calc(-1 * var(--la-pad)) var(--la-pad);
  padding: 1.1rem var(--la-pad) 1.15rem;
}
.lesson-activity--stepper .la-activity-header .la-prompt {
  margin: 0;
  color: var(--la-teal) !important;
  font-size: 1.35rem !important;
  font-weight: 700 !important;
}
.lesson-activity--stepper .la-progress {
  background: rgba(255, 255, 255, 0.65);
  color: var(--la-teal) !important;
  margin-bottom: 0;
  margin-top: 0.55rem;
}

/* Clickable auction chips (find-error) */
.la-bidchips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 4px; }
.la-bidchips .la-answer { flex: 0 0 auto; }
.la-bidchips.la-bidchips--stack { flex-direction: column; align-items: stretch; }
.la-bidchips.la-bidchips--stack .la-answer { flex: 1 1 auto; }

/* Stage divider (plan-play) */
.la-divider { border: 0; border-top: 1px solid var(--la-line); margin: 18px 0; }

/* Collapsed by default; opens with an animated height change (grid-rows
   0fr -> 1fr) so the reveal doesn't jump. Browsers without the fr transition
   simply snap open, same as before. */
.la-feedback {
  display: grid;
  grid-template-rows: 0fr;
  margin-top: 0;
  border: 1px solid transparent;
  border-radius: var(--la-radius);
  padding: 0 16px;
  background: transparent;
  opacity: 0;
  transition: grid-template-rows 300ms ease, opacity 250ms ease,
    margin-top 300ms ease, padding 300ms ease,
    background-color 250ms ease, border-color 250ms ease;
}
.la-feedback__inner {
  min-height: 0;
  overflow: hidden;
}
.la-feedback.show {
  grid-template-rows: 1fr;
  margin-top: 14px;
  padding: 14px 16px;
  background: var(--la-paper);
  border-color: var(--la-line);
  opacity: 1;
}
.la-feedback h4 { margin: 0 0 6px; font-size: 1.05rem; }
.la-feedback p { margin: 0; }
.la-feedback.correct { border-color: var(--la-green-line); background: var(--la-green-bg); }
.la-feedback.correct h4 { color: var(--la-green); }
.la-feedback.reasonable { border-color: var(--la-amber); background: var(--la-gold-bg); }
.la-feedback.reasonable h4 { color: var(--la-gold); }
.la-feedback.incorrect { border-color: var(--la-red-line); background: var(--la-red-bg); }
.la-feedback.incorrect h4 { color: var(--la-red); }

.la-actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 14px; }

.la-btn {
  border: 2px solid var(--la-teal-line);
  border-radius: 999px;
  padding: 9px 22px;
  min-height: 44px;
  background: var(--la-paper);
  color: var(--la-teal);
  cursor: pointer;
  font-weight: 700;
}
.la-btn:hover:not(:disabled) { background: var(--la-teal-soft); }
.la-btn:disabled { opacity: 0.5; cursor: default; }
.la-btn--primary {
  background: var(--la-amber);
  border-color: var(--la-amber-dark);
  color: var(--la-ink);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}
.la-btn--primary:hover:not(:disabled) { background: var(--la-amber-dark); }

/* ---- Count points ---- */

.la-counter { display: flex; align-items: center; gap: 12px; margin: 6px 0 4px; }
.la-counter button {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 2px solid var(--la-teal-line);
  background: var(--la-paper);
  color: var(--la-teal);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
}
.la-counter button:hover:not(:disabled) { background: var(--la-teal-soft); }
.la-counter button:disabled { opacity: 0.45; cursor: default; }
.la-counter output {
  min-width: 72px;
  text-align: center;
  font-size: 1.7rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* ---- Match pairs ---- */

.la-match { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 18px; margin-bottom: 4px; }
.la-match-col { display: grid; gap: 10px; align-content: start; }
.la-match .la-answer.matched {
  border-color: var(--la-green-line);
  background: var(--la-green-bg);
  cursor: default;
}
.la-match .la-answer.matched::after { content: "\2713"; float: right; font-weight: 700; color: var(--la-green); }

/* ---- Order sequence ---- */

.la-order-slots {
  min-height: 54px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  padding: 10px;
  margin: 0 0 12px;
  border: 2px dashed var(--la-line);
  border-radius: var(--la-radius);
  counter-reset: la-step;
}
.la-order-slots .la-chip {
  counter-increment: la-step;
  background: var(--la-teal-soft);
  border: 1px solid var(--la-teal-line);
  border-radius: 999px;
  padding: 8px 14px;
  font-weight: 700;
}
.la-order-slots .la-chip::before { content: counter(la-step) ". "; color: var(--la-teal); }
.la-order-pool { display: grid; gap: 10px; }
.la-order-pool .la-answer.used { opacity: 0.35; cursor: default; }

/* ---- Flip cards ---- */

.la-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 12px; }
.la-flip {
  position: relative;
  min-height: 130px;
  border: 0;
  padding: 0;
  background: none;
  cursor: pointer;
  perspective: 800px;
  text-align: center;
}
.la-flip-inner {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 130px;
  transition: transform 0.45s;
  transform-style: preserve-3d;
}
.la-flip[aria-pressed="true"] .la-flip-inner { transform: rotateY(180deg); }
.la-flip-face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 14px;
  border-radius: var(--la-radius);
  backface-visibility: hidden;
  line-height: 1.45;
}
.la-flip-front {
  background: var(--la-teal);
  color: #FFFFFF;
  font-size: 1.15rem;
  font-weight: 700;
}
.la-flip-back {
  background: var(--la-gold-bg);
  border: 1px solid var(--la-amber);
  color: var(--la-ink);
  transform: rotateY(180deg);
  font-size: 0.98rem;
}
.la-flip-hint { display: block; margin-top: 8px; color: var(--la-muted); font-size: 0.9rem; }

/* ---- Stepper ---- */

.la-step-body { margin: 0 0 14px; }
.la-step-body p { margin: 0 0 10px; }

/* ---- Responsive ---- */

@media (max-width: 560px) {
  .la-answers, .la-match { grid-template-columns: 1fr; }
  .la-hand { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .lesson-activity * { transition: none !important; }
}