:root {
  --bg: #faf9f6;
  --surface: #ffffff;
  --fg: #1a1a1a;
  --muted: #777;
  --accent: #2a5db0;
  --correct: #2a8c3f;
  --incorrect: #c14040;
  --border: #e3e3df;
  --radius: 6px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
}

header {
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--surface);
}

h1 {
  font-size: 1rem;
  margin: 0;
  font-weight: 600;
  letter-spacing: 0.02em;
  flex-grow: 1;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--fg);
  cursor: pointer;
}
.icon-btn:hover { background: var(--tint-neutral); border-color: var(--border); }
.icon-btn[aria-expanded="true"] {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.page-link {
  font-size: 0.85rem;
  color: var(--muted);
  text-decoration: none;
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius);
}
.page-link:hover { color: var(--accent); background: var(--tint-neutral); }

.layout {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 2rem;
  max-width: 1120px;
  margin: 1.5rem auto;
  padding: 0 1.5rem;
}
/* Collapsed: hide the sidebar entirely, main spans full width. */
.layout.collapsed {
  grid-template-columns: minmax(0, 1fr);
  max-width: 880px;
}
.layout.collapsed #filter-bar {
  display: none;
}

main { min-width: 0; }

.loading { color: var(--muted); text-align: center; }

#filter-bar {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  position: sticky;
  top: 1rem;
  align-self: start;
}
.filter-row {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.filter-row .label {
  font-size: 0.7rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0 0.5rem 0.3rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.3rem;
}
.filter-row button {
  font: inherit;
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-align: left;
  padding: 0.35rem 0.6rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--fg);
  cursor: pointer;
  font-size: 0.85rem;
  width: 100%;
}
.filter-row button:hover { background: var(--tint-neutral); }
/* Empty filter chips (count == 0 and not currently selected) are hidden
   entirely — offering a choice that leads to nothing is just noise.
   Currently-selected empty chips stay visible so the user can see why
   the practice queue is empty. Applies to every chip inside the filter
   bar regardless of which row it lives in. */
.filter-row button.empty,
#filter-bar button.empty { display: none; }
.filter-row button.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}
.filter-row .count {
  font-size: 0.7rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.filter-row button.active .count {
  color: rgba(255, 255, 255, 0.85);
}

/* On narrow screens, collapse the sidebar back into a top bar with
   horizontally-wrapped pills so it works on mobile. */
@media (max-width: 720px) {
  .layout {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  #filter-bar {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.75rem 1.5rem;
  }
  .filter-row {
    flex: 0 1 auto;
  }
  .filter-row .label {
    padding: 0;
    border-bottom: none;
    margin-bottom: 0.25rem;
  }
  .filter-row {
    display: flex;
    flex-direction: row;
    gap: 0.3rem;
    align-items: center;
    flex-wrap: wrap;
  }
  .filter-row .label {
    margin: 0 0.3rem 0 0;
  }
  .filter-row button {
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.25rem 0.7rem;
    width: auto;
    font-size: 0.8rem;
  }
  .filter-row button.active {
    border-color: var(--accent);
  }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  grid-template-areas:
    "meta    meta"
    "prompt  prompt"
    "clues   answer"
    "reveal  reveal"
    "actions actions";
  column-gap: 1.5rem;
  row-gap: 0.75rem;
  align-items: start;
}

/* Stem-assembly cards need the full width for the palette / slots. */
.card--assembly {
  grid-template-areas:
    "meta    meta"
    "prompt  prompt"
    "clues   clues"
    "answer  answer"
    "reveal  reveal"
    "actions actions";
}

.card-meta {
  grid-area: meta;
  font-size: 0.8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0;
}

.card > .prompt { grid-area: prompt; }
.card > .clue-tray { grid-area: clues; margin: 0; }
.card > answer-choices { grid-area: answer; margin: 0; }
.card > stem-assembler { grid-area: answer; margin: 0; }
.card > .answer { grid-area: reveal; }
.card > .actions { grid-area: actions; margin: 0; }

.prompt {
  font-size: 1.85rem;
  font-weight: 500;
  margin: 0;
}

.prompt.secondary {
  font-size: 1.3rem;
  color: var(--accent);
  margin: 0 0 0.25rem;
}

/* Article gender colour-coding — common Dutch-learner convention.
 * de (common gender, most nouns) -> blue
 * het (neuter)                    -> orange / red */
.article {
  display: inline-block;
  font-weight: 700;
  padding: 0 0.25rem;
  border-radius: 4px;
  margin-right: 0.05rem;
}
/* theme.css overrides these with var(--de) / var(--het); kept here as
   a sensible fallback for stylesheets loaded without theme.css. */
.article.art-de  { color: var(--de);  background: var(--de-2); }
.article.art-het { color: var(--het); background: var(--het-2); }

.etym {
  color: var(--muted);
  font-style: italic;
  margin: 0;
}

.clue-tray {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

@media (max-width: 640px) {
  .card, .card--assembly {
    grid-template-columns: 1fr;
    grid-template-areas:
      "meta"
      "prompt"
      "clues"
      "answer"
      "reveal"
      "actions";
  }
  .prompt { font-size: 1.5rem; }
}

button {
  font: inherit;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  cursor: pointer;
  color: var(--fg);
}

button:hover { background: var(--tint-neutral); }
button[hidden] { display: none; }
button.primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}
button.primary:hover { background: #234d96; }
button.danger {
  background: var(--incorrect);
  color: white;
  border-color: var(--incorrect);
}
button.danger:hover { background: #a83434; }

#progress {
  display: flex;
  gap: 5px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
}
.dot.current { background: var(--accent); }
.dot.correct { background: var(--correct); }
.dot.incorrect { background: var(--incorrect); }

footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 0.75rem 1.5rem;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}
.reset-link {
  background: none;
  border: none;
  color: var(--muted);
  text-decoration: underline;
  cursor: pointer;
  font: inherit;
  padding: 0;
}
.reset-link:hover { color: var(--incorrect); }

/* Keyboard hint badge — used inside answer-choices buttons and palette stems */
.key-hint {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.35rem;
  height: 1.35rem;
  padding: 0 0.3rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--muted);
  background: var(--tint-neutral);
  border: 1px solid var(--border);
  border-radius: 4px;
  flex-shrink: 0;
}

/* answer-choices and text-choices atoms */
answer-choices,
text-choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin: 1rem 0;
}
@media (max-width: 480px) {
  answer-choices,
  text-choices { grid-template-columns: 1fr; }
}

answer-choices button.choice,
text-choices button.choice {
  text-align: left;
  padding: 0.6rem 0.8rem;
  min-height: 3rem;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  transition: background 120ms, border-color 120ms, opacity 120ms;
}
answer-choices .choice-text,
text-choices .choice-text { flex: 1; }
answer-choices button.choice:disabled,
text-choices button.choice:disabled { cursor: default; }
answer-choices button.choice.correct,
text-choices button.choice.correct {
  background: var(--status-correct-bg);
  border-color: var(--correct);
  color: var(--status-correct-fg);
  font-weight: 600;
}
answer-choices button.choice.incorrect,
text-choices button.choice.incorrect {
  background: var(--status-incorrect-bg);
  border-color: var(--incorrect);
  color: var(--status-incorrect-fg);
  text-decoration: line-through;
}
answer-choices button.choice.dim,
text-choices button.choice.dim {
  opacity: 0.45;
}

/* stem-assembler atom */
stem-assembler { display: block; margin: 1rem 0; }

stem-assembler .slots {
  display: flex;
  gap: 0.4rem;
  align-items: center;
  flex-wrap: wrap;
  padding: 1rem;
  background: var(--tint-neutral);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  min-height: 4rem;
}

stem-assembler .slot {
  font: inherit;
  min-width: 5.5rem;
  min-height: 3rem;
  padding: 0.4rem 0.7rem;
  border: 1px dashed #bbb;
  border-radius: var(--radius);
  background: var(--surface);
  cursor: pointer;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  line-height: 1.2;
}
stem-assembler .slot.filled { border-style: solid; border-color: var(--border); }
stem-assembler .slot.correct {
  background: var(--status-correct-bg); border-color: var(--correct); color: var(--status-correct-fg);
}
stem-assembler .slot.incorrect {
  background: var(--status-incorrect-bg); border-color: var(--incorrect); color: var(--status-incorrect-fg);
}
stem-assembler .slot:disabled { cursor: default; }
stem-assembler .slot-placeholder { color: #bbb; font-size: 1.3rem; }
stem-assembler .slot-plus { color: var(--muted); font-size: 1.2rem; padding: 0 0.1rem; }

stem-assembler .palette {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

stem-assembler .palette-stem {
  font: inherit;
  padding: 0.5rem 0.75rem 0.5rem 1.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  cursor: pointer;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  line-height: 1.2;
  min-width: 5.5rem;
  position: relative;
}
stem-assembler .palette-stem .key-hint {
  position: absolute;
  top: 0.25rem;
  left: 0.3rem;
  min-width: 1.1rem;
  height: 1.1rem;
  font-size: 0.6rem;
  padding: 0 0.25rem;
}
stem-assembler .palette-stem:disabled .key-hint { opacity: 0.4; }
stem-assembler .palette-stem:hover:not(:disabled) { background: var(--tint-neutral); }
stem-assembler .palette-stem:disabled { opacity: 0.25; cursor: default; }

stem-assembler .stem-dutch { font-weight: 500; }
stem-assembler .stem-meaning-small {
  color: var(--muted);
  font-size: 0.75rem;
  margin-top: 0.15rem;
}

.practice-hint {
  color: var(--muted);
  font-size: 0.85rem;
  font-style: italic;
  margin: 0.5rem 0 0;
}

/* POS badge — small label next to the prompt */
.pos-badge {
  display: inline-block;
  vertical-align: middle;
  margin-left: 0.6rem;
  padding: 0.15rem 0.55rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: lowercase;
  color: var(--muted);
  background: var(--tint-neutral);
  border-radius: 999px;
  border: 1px solid var(--border);
}

/* clue-audio atom — inline speaker icon next to the Dutch prompt */
clue-audio {
  display: inline-flex;
  vertical-align: middle;
  margin-left: 0.6rem;
}
clue-audio .audio-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  transition: color 120ms, border-color 120ms, background 120ms;
}
clue-audio .audio-btn:hover { color: var(--accent); border-color: var(--accent); }
clue-audio .audio-btn:active { background: var(--tint-neutral); }
clue-audio svg { display: block; }

/* clue-image atom */
clue-image { display: block; }
clue-image img {
  display: block;
  max-width: 100%;
  max-height: 200px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

/* clue-sentence atom */
clue-sentence { display: block; }
clue-sentence .sentence-nl {
  font-style: italic;
  margin: 0.25rem 0 0.25rem;
  color: var(--fg);
}
clue-sentence .sentence-en {
  margin: 0.15rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

/* clue-stems atom */
clue-stems {
  display: block;
  font-size: 0.95rem;
  color: var(--fg);
}
clue-stems .stem { color: var(--fg); }
clue-stems .stem-meaning { color: var(--muted); margin-left: 0.2em; }
clue-stems .stem-plus { color: var(--muted); margin: 0 0.3em; }
clue-stems .stem-miss { color: var(--incorrect); }
clue-stems button.clue-btn {
  font-size: 0.85rem;
  padding: 0.3rem 0.7rem;
  color: var(--muted);
}

/* ── Dialogues ─────────────────────────────────────────────────────────────── */

.dlg-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.dlg-card {
  display: block;
  width: 100%;
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  cursor: pointer;
  transition: border-color 0.12s, box-shadow 0.12s;
}
.dlg-card:hover {
  border-color: var(--accent);
  box-shadow: 0 2px 8px rgba(0,0,0,0.07);
}

.dlg-card__header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
  flex-wrap: wrap;
}
.dlg-card__level {
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--accent);
  color: white;
  border-radius: 3px;
  padding: 0.1rem 0.45rem;
  letter-spacing: 0.03em;
}
.dlg-card__cat {
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.dlg-card__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}
.dlg-card__context {
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: 0.3rem;
  line-height: 1.4;
}
.dlg-card__speakers {
  font-size: 0.8rem;
  color: var(--muted);
}

.dlg-diff {
  font-size: 0.72rem;
  border-radius: 3px;
  padding: 0.1rem 0.45rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.dlg-diff--1 { background: var(--status-correct-bg);   color: var(--status-correct-fg); }
.dlg-diff--2 { background: var(--status-partial-bg);   color: var(--status-partial-fg); }
.dlg-diff--3 { background: var(--status-incorrect-bg); color: var(--status-incorrect-fg); }

.dlg-score {
  margin-left: auto;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.1rem 0.5rem;
  border-radius: 3px;
}
.dlg-score--perfect  { background: var(--status-correct-bg); color: var(--status-correct-fg); }
.dlg-score--partial  { background: var(--status-partial-bg); color: var(--status-partial-fg); }

/* Exercise wrapper */
.dlg-exercise {
  max-width: 680px;
}
.dlg-back {
  margin-bottom: 1rem;
}
.dlg-meta {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}
.dlg-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
}
.dlg-context {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0 0 1rem;
  line-height: 1.5;
}

/* Speakers */
.dlg-speakers {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}
.dlg-speaker {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.dlg-speaker__initial {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}
.dlg-speaker__name {
  font-weight: 600;
  font-size: 0.9rem;
}
.dlg-speaker__role {
  font-size: 0.8rem;
  color: var(--muted);
}

/* Audio player */
.dlg-player {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: var(--tint-neutral);
  border-radius: var(--radius);
}
.dlg-play-btn {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.15s;
}
.dlg-play-btn:hover { background: #1e4a9a; }
.dlg-play-btn.playing { background: #2a8c3f; }
.dlg-play-hint {
  font-size: 0.875rem;
  color: var(--muted);
}

/* Questions */
.dlg-q-nav {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}
.dlg-q-progress {
  font-size: 0.85rem;
  color: var(--muted);
  margin-left: auto;
}
.dlg-replay {
  font-size: 0.82rem;
}
.dlg-q-type {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.5rem;
}
.dlg-question {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 0.2rem;
  line-height: 1.4;
}
.dlg-question-en {
  font-size: 0.875rem;
  color: var(--muted);
  margin: 0 0 1.25rem;
}
.dlg-options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
}
.dlg-option {
  text-align: left;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  cursor: pointer;
  font-size: 0.9rem;
  line-height: 1.45;
  transition: border-color 0.12s, background 0.12s;
}
.dlg-option:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--tint-blue);
}
.dlg-option:disabled { cursor: default; }
.dlg-option--correct  { border-color: var(--correct);  background: var(--status-correct-bg);   color: var(--status-correct-fg); }
.dlg-option--incorrect { border-color: var(--incorrect); background: var(--status-incorrect-bg); color: var(--status-incorrect-fg); }

.dlg-explanation {
  padding: 0.75rem 1rem;
  background: var(--tint-neutral);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.875rem;
  line-height: 1.55;
  margin-bottom: 1rem;
}

/* Done / results */
.dlg-score-banner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  margin-bottom: 1.25rem;
}
.dlg-score-banner--perfect  { background: var(--status-correct-bg); color: var(--status-correct-fg); }
.dlg-score-banner--partial  { background: var(--status-partial-bg); color: var(--status-partial-fg); }
.dlg-score-num {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
}
.dlg-score-msg { font-size: 1rem; font-weight: 600; }

.dlg-summary {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}
.dlg-summary-item {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
}
.dlg-summary-item--correct   { background: var(--status-correct-bg); }
.dlg-summary-item--incorrect { background: var(--status-incorrect-bg); }
.dlg-summary-icon {
  font-weight: 700;
  flex-shrink: 0;
}
.dlg-summary-item--correct   .dlg-summary-icon { color: var(--correct); }
.dlg-summary-item--incorrect .dlg-summary-icon { color: var(--incorrect); }
.dlg-summary-q { flex: 1; }

/* Vocabulary section */
.dlg-vocab-section {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  margin-bottom: 1.5rem;
}
.dlg-vocab-section > summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  user-select: none;
  padding: 0.1rem 0;
}
.dlg-vocab-list {
  margin: 0.75rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.dlg-vocab-item { display: contents; }
.dlg-vocab-word {
  font-weight: 700;
  font-size: 0.95rem;
  margin: 0 0 0.15rem;
}
.dlg-vocab-note {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--fg);
  margin: 0 0 0.1rem;
}
.dlg-vocab-note-en {
  font-size: 0.82rem;
  color: var(--muted);
  margin: 0 0 0.6rem;
}