/* Lesson player, question types, feedback and end-of-session screens. */

.player {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--paper);
}

/* ------------------------------------------------------------- top bar */
.player-top {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: var(--s3);
  padding: var(--s2) var(--s4);
  padding-top: calc(var(--s2) + env(safe-area-inset-top, 0px));
  background: var(--paper);
}
.player-progress {
  flex: 1;
  height: 16px;
  border: var(--bw) solid var(--edge);
  border-radius: 999px;
  background: var(--sunken);
  overflow: hidden;
}
.player-progress > i {
  display: block;
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: var(--brand);
  background-image: linear-gradient(to bottom, rgba(255, 255, 255, 0.35) 0 35%, transparent 35%);
  transition: width 0.5s var(--ease-out);
}
.player[data-mode='review'] .player-progress > i { background-color: var(--violet); }
.player-combo {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  min-width: 44px;
  justify-content: center;
  font-weight: 800;
  color: var(--orange-text);
}
.player-combo svg { color: var(--orange); }

/* ---------------------------------------------------------------- stage */
.player-body { flex: 1; display: flex; flex-direction: column; }
.player-stage {
  width: min(720px, 100%);
  margin: 0 auto;
  padding: var(--s5) var(--s5) var(--s10);
  flex: 1;
}
/* minmax(0, 1fr): a wide child (a long line of code) scrolls inside itself instead of stretching the step */
.step { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--s5); outline: none; }
.step-badges { display: flex; flex-wrap: wrap; gap: var(--s2); }
.step-title { font-size: clamp(1.45rem, 3.6vw, 1.9rem); }
.step-text { font-size: 1.15rem; }
.step-figures { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--s4); justify-items: center; }
.step-figure { width: 100%; display: grid; grid-template-columns: minmax(0, 1fr); justify-items: center; }
.step-input { min-width: 0; }
.step-instruction { color: var(--ink-3); font-size: var(--fs-sm); font-weight: 700; margin: 0 0 var(--s2); }
.step-instruction code { color: var(--ink-2); }
.step-input > div > .step-instruction:last-child { margin: var(--s3) 0 0; font-weight: 500; }

.lesson-intro, .step-interstitial { justify-items: center; text-align: center; padding-top: clamp(1rem, 8vh, 5rem); gap: var(--s4); }
.lesson-intro .intro-title { font-size: clamp(2rem, 6vw, 3rem); }
.lesson-intro .md, .step-interstitial .md { color: var(--ink-2); max-width: 46ch; font-size: var(--fs-xl); line-height: 1.4; }

/* -------------------------------------------------------------- options */
.options { display: grid; gap: var(--s3); }
.options.is-grid { grid-template-columns: repeat(var(--cols, 2), minmax(0, 1fr)); }
.option {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--s3);
  width: 100%;
  min-height: 60px;
  padding: 0.75rem 1rem;
  border: var(--bw) solid var(--edge);
  border-radius: var(--r);
  background: var(--surface);
  color: var(--ink);
  font-size: var(--fs-lg);
  line-height: 1.35;
  text-align: left;
  box-shadow: 3px 3px 0 var(--drop);
  transition: transform 0.09s ease, box-shadow 0.09s ease, background-color 0.15s ease, border-color 0.15s ease, opacity 0.2s ease;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.option:hover { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--drop); }
.option:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--drop); }
.option-key {
  flex: none;
  display: grid; place-items: center;
  width: 30px; height: 30px;
  border: var(--bw) solid var(--hair);
  border-radius: 50%;
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--ink-3);
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.options.is-multi .option-key { border-radius: 8px; }
.option-body { flex: 1; min-width: 0; display: grid; gap: var(--s2); }
.option-figure { display: block; }
.option-mark { flex: none; display: grid; place-items: center; width: 24px; }
.option[aria-checked='true'] { background: var(--blue-soft); border-color: var(--blue); box-shadow: 3px 3px 0 var(--blue); }
.option[aria-checked='true'] .option-key { background: var(--blue); border-color: var(--blue); color: #1D1B26; }
.option.is-correct { background: var(--green-soft); border-color: var(--green); box-shadow: 3px 3px 0 var(--green); }
.option.is-correct .option-key { background: var(--green); border-color: var(--green); color: #1D1B26; }
.option.is-correct .option-mark { color: var(--green-text); }
.option.is-wrong { background: var(--red-soft); border-color: var(--red); box-shadow: none; transform: none; }
.option.is-wrong .option-key { background: var(--red); border-color: var(--red); color: #1D1B26; }
.option.is-wrong .option-mark { color: var(--red-text); }
.option.is-wrong .option-body { text-decoration: line-through; text-decoration-color: var(--red); text-decoration-thickness: 2px; opacity: 0.75; }
.option:disabled, .option.is-locked { pointer-events: none; }
.option.is-dim { opacity: 0.5; box-shadow: none; }
.option.is-locked:not(.is-correct):not(.is-wrong):not([aria-checked='true']) { box-shadow: none; }
@media (max-width: 480px) {
  .options.is-grid:not(.has-figures):not(.is-tiny) { grid-template-columns: minmax(0, 1fr); }
  .options.is-grid.is-tiny, .options.is-grid.has-figures { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .option { padding: 0.65rem 0.75rem; gap: var(--s2); }
}

/* ---------------------------------------------------- typed-answer rows */
.answer-row { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: var(--s3); }
.answer-affix { font-size: var(--fs-xl); font-weight: 700; }
.answer-box { position: relative; max-width: 100%; }
.answer-input {
  max-width: 100%;
  min-height: 64px;
  padding: 0.5rem 1rem;
  border: var(--bw) solid var(--edge);
  border-radius: var(--r);
  background: var(--surface);
  color: var(--ink);
  font-size: 1.6rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-align: center;
  box-shadow: inset 3px 3px 0 var(--sunken);
  transition: border-color 0.15s ease, background-color 0.15s ease;
}
.answer-input.is-text { font-size: 1.3rem; font-weight: 600; }
.answer-input.is-math { font-family: var(--font-mono); font-variant-ligatures: none; font-size: 1.15rem; }
.answer-input::placeholder { color: var(--ink-3); font-weight: 500; }
.answer-input:focus { outline: none; border-color: var(--focus); box-shadow: inset 3px 3px 0 var(--sunken), 0 0 0 3px rgba(63, 140, 255, 0.3); }
.answer-row.is-right .answer-input { border-color: var(--green); background: var(--green-soft); }
.answer-row.is-wrong .answer-input { border-color: var(--red); background: var(--red-soft); }
.answer-row.is-revealed .answer-input { border-color: var(--blue); background: var(--blue-soft); }
.expr-preview { min-height: 2.4rem; display: grid; place-items: center; margin-top: var(--s3); font-size: 1.2rem; color: var(--ink-2); }
.expr-preview.is-bad { color: var(--ink-3); }
.step-input .expr-preview + .step-instruction { text-align: center; }

/* ------------------------------------------------------------- sortable */
.sort-list { list-style: none; display: grid; gap: var(--s2); }
.sort-label { font-size: var(--fs-xs); font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); text-align: center; padding: var(--s1) 0; }
.sort-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--s2);
  min-height: 54px;
  padding: 0.5rem 0.9rem 0.5rem 0.4rem;
  border: var(--bw) solid var(--edge);
  border-radius: var(--r);
  background: var(--surface);
  font-size: var(--fs-lg);
  box-shadow: 3px 3px 0 var(--drop);
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
  transition: transform 0.18s var(--ease-out), box-shadow 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
}
.sort-item.is-dragging { z-index: 5; cursor: grabbing; box-shadow: 7px 7px 0 var(--drop); transition: box-shadow 0.15s ease; background: var(--yellow-soft); }
.sort-item.is-selected { border-color: var(--blue); background: var(--blue-soft); box-shadow: 3px 3px 0 var(--blue); }
.sort-grip { flex: none; display: grid; place-items: center; width: 36px; height: 40px; color: var(--ink-3); touch-action: none; cursor: grab; }
.sort-text, .sort-code { flex: 1; min-width: 0; }
.sort-list.is-code .sort-item { font-size: var(--fs-md); }
.sort-code { font-family: var(--font-mono); font-variant-ligatures: none; font-size: 0.95rem; white-space: pre; overflow-x: auto; background: none; border: 0; padding: 0; }
.sort-mark { flex: none; width: 22px; display: grid; place-items: center; }
.sort-item.is-right { border-color: var(--green); background: var(--green-soft); }
.sort-item.is-right .sort-mark { color: var(--green-text); }
.sort-item.is-wrong { border-color: var(--red); background: var(--red-soft); }
.sort-item.is-wrong .sort-mark { color: var(--red-text); }
.sort-list.is-locked .sort-item { cursor: default; box-shadow: none; }
.sort-list.is-locked .sort-grip { visibility: hidden; }

/* ------------------------------------------------------ chips and zones */
.chip-pool {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--s2);
  min-height: 64px;
  padding: var(--s3);
  border: var(--bw) dashed var(--hair);
  border-radius: var(--r-lg);
  transition: border-color 0.15s ease, background-color 0.15s ease;
}
.chip-token {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.35rem 0.85rem;
  border: var(--bw) solid var(--edge);
  border-radius: 12px;
  background: var(--surface);
  color: var(--ink);
  font-size: var(--fs-md);
  font-weight: 650;
  box-shadow: 2px 2px 0 var(--drop);
  cursor: grab;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  transition: box-shadow 0.12s ease, background-color 0.15s ease, border-color 0.15s ease;
  animation: pop-in 0.25s var(--ease-spring) both;
}
.chip-token.is-dragging { z-index: 30; position: relative; cursor: grabbing; box-shadow: 6px 6px 0 var(--drop); background: var(--yellow-soft); animation: none; }
.chip-token.is-selected { border-color: var(--blue); background: var(--blue-soft); box-shadow: 2px 2px 0 var(--blue); }
.chip-token.is-right { border-color: var(--green); background: var(--green-soft); box-shadow: none; }
.chip-token.is-wrong { border-color: var(--red); background: var(--red-soft); box-shadow: none; }
.is-target:not(.is-filled), .chip-pool.is-target, .bucket.is-target { border-color: var(--blue); cursor: pointer; }
.is-over { background: var(--blue-soft); border-color: var(--blue) !important; }

.match { display: grid; gap: var(--s4); }
.match-rows { display: grid; gap: var(--s2); }
.match-row { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); align-items: center; gap: var(--s2); }
.match-left {
  min-height: 52px;
  display: flex; align-items: center;
  padding: 0.4rem 0.85rem;
  border: var(--bw) solid var(--edge);
  border-radius: 12px;
  background: var(--sunken);
  font-weight: 650;
}
.match-arrow { color: var(--ink-3); font-weight: 800; }
.match-slot {
  min-height: 52px;
  display: flex; align-items: center; justify-content: center;
  padding: 3px;
  border: var(--bw) dashed var(--hair);
  border-radius: 12px;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}
.match-slot .chip-token { width: 100%; justify-content: center; }
@media (max-width: 480px) { .match-arrow { display: none; } .match-row { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }

.bucketing { display: grid; gap: var(--s4); }
.buckets { display: grid; grid-template-columns: repeat(var(--cols, 2), minmax(0, 1fr)); gap: var(--s3); }
.bucket {
  display: flex; flex-direction: column;
  min-height: 150px;
  border: var(--bw) solid var(--edge);
  border-radius: var(--r-lg);
  background: var(--surface);
  overflow: hidden;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}
.bucket { min-width: 0; }
.bucket-title { padding: var(--s2) var(--s3); background: var(--sunken); border-bottom: var(--bw) solid var(--edge); font-weight: 800; text-align: center; }
.bucket-body { flex: 1; display: flex; flex-wrap: wrap; align-content: flex-start; justify-content: center; gap: var(--s2); padding: var(--s3); }
@media (max-width: 560px) { .buckets { grid-template-columns: repeat(min(var(--cols, 2), 2), minmax(0, 1fr)); } }

/* ------------------------------------------------------------ fill-ins */
.fill { font-size: 1.2rem; line-height: 2.4; }
.fill .math-display { line-height: 1.4; }
.blank { display: inline-block; vertical-align: baseline; margin: 0 0.15em; }
.blank-input, .blank-select {
  min-height: 44px;
  padding: 0.2rem 0.5rem;
  border: var(--bw) solid var(--edge);
  border-radius: 10px;
  background: var(--surface);
  color: var(--ink);
  font-size: inherit;
  font-weight: 700;
  text-align: center;
  max-width: 100%;
}
.blank-select { text-align: left; padding-right: 0.3rem; }
.blank-input:focus, .blank-select:focus { outline: none; border-color: var(--focus); box-shadow: 0 0 0 3px rgba(63, 140, 255, 0.3); }
.blank.is-right .blank-input, .blank.is-right .blank-select { border-color: var(--green); background: var(--green-soft); }
.blank.is-wrong .blank-input, .blank.is-wrong .blank-select { border-color: var(--red); background: var(--red-soft); }

/* -------------------------------------------------------------- slider */
.slider-q { display: grid; gap: var(--s2); padding: var(--s4) var(--s2); }
.slider-readout { display: flex; align-items: baseline; justify-content: center; gap: var(--s2); }
.slider-value { font-family: var(--font-display); font-variation-settings: 'SOFT' 100; font-weight: 800; font-size: 3rem; line-height: 1; font-variant-numeric: tabular-nums; }
.slider-ends { display: flex; justify-content: space-between; color: var(--ink-3); font-size: var(--fs-sm); font-weight: 700; }
.slider-q.is-right .slider-value { color: var(--green-text); }
.slider-q.is-wrong .slider-value { color: var(--red-text); }
.slider-q.is-revealed .slider-value { color: var(--blue-text); }

/* ------------------------------------------------------------- reflect */
.reflect { display: grid; gap: var(--s3); }
.reflect-input { font-size: var(--fs-lg); }
.reflect-model { padding: var(--s4); border: var(--bw) solid var(--violet); border-radius: var(--r-lg); background: var(--violet-soft); }
.reflect-model .eyebrow { color: var(--violet-text); margin-bottom: var(--s2); }
.reflect-rating { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s2); }

/* ------------------------------------------------- hints + explanation */
.step-hints { display: grid; gap: var(--s3); }
.step-hints:empty { display: none; }
.hint-card { padding: var(--s3) var(--s4); border: var(--bw) solid var(--yellow); border-radius: var(--r-lg); background: var(--yellow-soft); }
.hint-head { display: flex; align-items: center; gap: var(--s2); margin-bottom: var(--s1); font-size: var(--fs-xs); font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; color: var(--yellow-text); }
.hint-card .md { font-size: var(--fs-md); }
.explain-card { padding: var(--s4); border: var(--bw) solid var(--hair); border-left: 6px solid var(--blue); border-radius: var(--r-lg); background: var(--surface); }
.explain-head { display: flex; align-items: center; gap: var(--s2); margin-bottom: var(--s2); font-size: var(--fs-xs); font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; color: var(--blue-text); }
.explain-card .md { font-size: 1.05rem; }

/* ----------------------------------------------------------- bottom bar */
.player-bottom {
  position: sticky;
  bottom: 0;
  z-index: 20;
  border-top: var(--bw) solid var(--hair);
  background: var(--surface);
  padding: var(--s3) var(--s4);
  padding-bottom: calc(var(--s3) + env(safe-area-inset-bottom, 0px));
  transition: background-color 0.25s ease, border-color 0.25s ease;
}
.player-bottom-inner { width: min(720px, 100%); margin: 0 auto; display: flex; flex-wrap: wrap; align-items: center; gap: var(--s3) var(--s4); }
.player-actions { display: flex; align-items: center; gap: var(--s2); margin-left: auto; }
.player-actions-left { display: flex; align-items: center; gap: var(--s1); min-width: 0; }
.player-primary { min-width: 150px; }
.hint-btn { color: var(--yellow-text); }
.hint-btn.is-nudge { animation: wiggle 0.5s ease 2; background: var(--yellow-soft); }
.player-bottom[data-state='correct'] { background: var(--green-soft); border-top-color: var(--green); }
.player-bottom[data-state='wrong'] { background: var(--red-soft); border-top-color: var(--red); }
.player-bottom[data-state='revealed'] { background: var(--blue-soft); border-top-color: var(--blue); }
.player-bottom[data-state='predict'] { background: var(--violet-soft); border-top-color: var(--violet); }

.verdict { display: flex; align-items: center; gap: var(--s3); flex: 1 1 260px; min-width: 0; }
.verdict .mascot { flex: none; }
.verdict-text { min-width: 0; }
.verdict-title { font-family: var(--font-display); font-variation-settings: 'SOFT' 100; font-weight: 750; font-size: var(--fs-xl); line-height: 1.2; }
.player-bottom[data-state='correct'] .verdict-title { color: var(--green-text); }
.player-bottom[data-state='wrong'] .verdict-title { color: var(--red-text); }
.player-bottom[data-state='revealed'] .verdict-title { color: var(--blue-text); }
.player-bottom[data-state='predict'] .verdict-title { color: var(--violet-text); }
.verdict-message { margin-top: 2px; }
.verdict-extras { display: flex; flex-wrap: wrap; gap: var(--s2); margin-top: var(--s2); }
.xp-chip, .combo-chip, .note-chip {
  display: inline-flex; align-items: center; gap: 0.25rem;
  padding: 0.12rem 0.55rem;
  border-radius: 999px;
  font-size: var(--fs-sm);
  font-weight: 800;
  background: var(--surface);
  border: var(--bw) solid var(--hair);
}
.xp-chip svg { color: var(--orange); }
.combo-chip svg { color: var(--red); }

.confidence { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s2); flex: 1 1 auto; }
.confidence-label { font-size: var(--fs-sm); font-weight: 700; color: var(--ink-2); margin-right: var(--s1); }
.confidence .filter { min-height: 36px; padding: 0.2rem 0.75rem; }

@media (max-width: 560px) {
  .player-stage { padding: var(--s4) var(--s4) var(--s8); }
  .player-actions { flex: 1 1 100%; }
  .player-primary { flex: 1 1 auto; }
  .verdict { flex-basis: 100%; }
  .verdict .mascot { width: 44px; height: auto; }
  .verdict-title { font-size: var(--fs-lg); }
}

/* -------------------------------------------------------------- summary */
.player.is-summary { align-items: center; }
.summary { width: min(620px, 100%); margin: 0 auto; padding: var(--s8) var(--s5) var(--s12); display: grid; gap: var(--s5); }
.summary-hero { display: grid; justify-items: center; gap: var(--s2); text-align: center; }
.summary-hero h1 { font-size: clamp(2rem, 7vw, 3rem); }
.summary-hero .mascot { animation: bob 2.4s ease-in-out infinite; }
.summary-stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s3); }
.summary-stat {
  display: grid; justify-items: center; gap: 2px;
  padding: var(--s4) var(--s2);
  border: var(--bw) solid var(--edge);
  border-radius: var(--r-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  text-align: center;
}
.summary-stat-icon { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; background: var(--accent-soft); color: var(--accent-text); }
.summary-stat-value { font-family: var(--font-display); font-variation-settings: 'SOFT' 100; font-weight: 800; font-size: 1.6rem; line-height: 1.2; font-variant-numeric: tabular-nums; }
.summary-stat-label { font-size: var(--fs-xs); font-weight: 700; color: var(--ink-3); }
.summary-card { padding: var(--s4) var(--s5); border: var(--bw) solid var(--hair); border-radius: var(--r-lg); background: var(--surface); display: grid; gap: var(--s3); }
.summary-goal, .summary-memory { display: flex; align-items: center; gap: var(--s4); }
.summary-goal-title { font-weight: 800; font-size: var(--fs-lg); line-height: 1.25; }
.summary-streak { display: grid; justify-items: center; color: var(--orange-text); line-height: 1.05; font-size: 1.3rem; }
.summary-streak svg { color: var(--orange); }
.summary-memory-icon { flex: none; display: grid; place-items: center; width: 52px; height: 52px; border-radius: 16px; background: var(--violet-soft); color: var(--violet-text); }
.summary-recap { list-style: none; display: grid; gap: var(--s2); }
.summary-recap li { display: flex; gap: var(--s2); align-items: flex-start; font-size: var(--fs-lg); }
.summary-recap li svg { flex: none; margin-top: 5px; color: var(--green-text); }
.summary-teaser { text-align: center; font-size: var(--fs-lg); color: var(--ink-2); font-style: italic; }
.summary-actions { display: grid; gap: var(--s3); justify-items: center; margin-top: var(--s2); }
.summary-actions > .btn { width: min(420px, 100%); white-space: normal; text-align: center; }
.ach-row { display: flex; align-items: center; gap: var(--s3); }
.ach-icon { flex: none; display: grid; place-items: center; width: 46px; height: 46px; border: var(--bw) solid var(--edge-strong); border-radius: 14px; background: var(--accent); color: #1D1B26; box-shadow: var(--shadow-sm); }
.ach-title { font-weight: 800; }
@media (max-width: 420px) { .summary-stat-value { font-size: 1.3rem; } }

.summary-edit { margin: var(--s2) 0 0; }