/*
 * quiz.css — Shared styles for General-Work ESL quiz pages
 *
 * Used by:
 *   Dairy/dairy_quiz.html
 *   Landscaping/tools_quiz.html
 *   (add new topic subfolders as needed)
 *
 * Font: system sans-serif stack — no external font loading required
 * Stack: Helvetica Neue, Arial, Liberation Sans, sans-serif
 *
 * CSS custom properties (variables) are defined in :root.
 * Per-topic color overrides can be added in a <style> block in each HTML file
 * by redefining any variable, e.g.:
 *   :root { --accent: #5c3a1a; }
 *
 * Future interaction modules:
 *   drag-drop.css    — drag-and-drop matching exercises   [STUB — not yet implemented]
 *   flashcard.css    — flip-card vocabulary review        [STUB — not yet implemented]
 *   imagemap.css     — clickable image-map exercises      [STUB — not yet implemented]
 *   audio-player.css — styled <audio> element wrapper     [STUB — not yet implemented]
 */

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── DESIGN TOKENS ── */
:root {
  /* Brand greens */
  --accent-dark:   #1a5c1a;
  --accent-mid:    #2e7d32;
  --accent-light:  #e8f5e9;
  --accent-border: #a5d6a7;

  /* Feedback colors */
  --correct:       #2e7d32;
  --correct-bg:    #e8f5e9;
  --wrong:         #c62828;
  --wrong-bg:      #ffebee;
  --wrong-border:  #ef9a9a;

  /* Neutral tones */
  --neutral:       #f5f5f5;
  --page-bg:       #f0f4f0;
  --card-bg:       #ffffff;

  /* Text */
  --text:          #1a1a1a;
  --subtext:       #555555;

  /* Card header (light — keeps text readable without color reversal) */
  --header-bg:     #e8f4fd;
  --header-border: #b3d7f0;
  --header-text:   #1a1a1a;

  /* Scenario / narrative highlight */
  --note-bg:       #fff8e1;
  --note-border:   #ffe082;

  /* Minimum tap target — Apple HIG / Android Material: 44px */
  --tap-min:       44px;

  /* Layout */
  --max-width:     700px;
  --radius-card:   12px;
  --radius-btn:    8px;
  --radius-pill:   20px;
}

/* ── BASE ── */
body {
  font-family: 'Helvetica Neue', Arial, 'Liberation Sans', sans-serif;
  background: var(--page-bg);
  color: var(--text);
  min-height: 100vh;
  padding: 24px 16px 48px;
}

/* ── HEADER ── */
header {
  max-width: var(--max-width);
  margin: 0 auto 20px;
  text-align: center;
}
header h1 {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--accent-dark);
  margin-bottom: 4px;
}
header p {
  font-size: 0.9rem;
  color: var(--subtext);
  line-height: 1.5;
}

/* ── SCENARIO SELECTOR ── */
.scenario-selector {
  max-width: var(--max-width);
  margin: 0 auto 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}
.scenario-btn {
  min-height: var(--tap-min);
  padding: 7px 16px;
  border: 2px solid var(--accent-border);
  border-radius: var(--radius-pill);
  background: var(--card-bg);
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-dark);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  text-align: center;
  line-height: 1.4;
}
.scenario-btn:hover { background: var(--accent-light); }
.scenario-btn.active {
  background: var(--accent-light);
  color: var(--text);
  font-weight: 900;
  border-color: var(--accent-mid);
}

/* ── NARRATIVE / SCENARIO NOTE ── */
.narrative {
  max-width: var(--max-width);
  margin: 0 auto 18px;
  background: var(--note-bg);
  border: 1.5px solid var(--note-border);
  border-radius: var(--radius-card);
  padding: 13px 18px;
  font-size: 0.92rem;
  line-height: 1.6;
}
.narrative-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-dark);
  margin-bottom: 5px;
}

/* ── PROGRESS BAR ── */
.progress-bar-wrap {
  max-width: var(--max-width);
  margin: 0 auto 8px;
  background: #ddd;
  border-radius: 6px;
  height: 8px;
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  background: var(--accent-mid);
  border-radius: 6px;
  transition: width 0.4s ease;
}
.progress-label {
  max-width: var(--max-width);
  margin: 0 auto 16px;
  font-size: 0.82rem;
  color: var(--subtext);
  text-align: right;
}

/* ── QUESTION CARD ── */
.card {
  max-width: var(--max-width);
  margin: 0 auto 16px;
  background: var(--card-bg);
  border-radius: var(--radius-card);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  overflow: hidden;
  border: 1.5px solid var(--accent-border);
}
.card-header {
  background: var(--header-bg);
  color: var(--header-text);
  padding: 12px 18px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  border-bottom: 1.5px solid var(--header-border);
}
.q-number {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-dark);
  background: rgba(46,125,50,0.1);
  border-radius: 4px;
  padding: 2px 8px;
  white-space: nowrap;
  margin-top: 2px;
}

/* English sentence shown in the card header */
.eng-prompt {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  flex: 1;
  color: var(--text);
}
/* Underlined keyword within the sentence */
.eng-prompt u {
  text-decoration: underline;
  color: var(--accent-dark);
}

/* ── AUDIO BUTTONS (text-to-speech triggers) ──────────────────────────────
 * .audio-btn       — question-level speaker (in card header)
 * .option-audio-btn — per-option speaker (left of each answer row)
 *
 * Both meet the 44px minimum tap target via min-width / min-height.
 * The option speaker is visually smaller but its tap area is padded to 44px.
 */
.audio-btn,
.option-audio-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.3rem;
  line-height: 1;
  border-radius: 4px;
  transition: transform 0.1s;
  flex-shrink: 0;
}
.audio-btn {
  /* Question-level: sits in card header row */
  min-width: var(--tap-min);
  min-height: var(--tap-min);
  padding: 4px;
  margin-top: -6px;   /* vertically centre with first line of prompt text */
}
.option-audio-btn {
  /* Per-option: narrower column, full row height via flex stretch */
  min-width: var(--tap-min);
  align-self: stretch;   /* fills the option-row height */
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 6px;
  font-size: 1.1rem;
}
.audio-btn:hover,
.option-audio-btn:hover       { transform: scale(1.2); }
.audio-btn.playing,
.option-audio-btn.playing     { animation: pulse 0.6s ease-in-out infinite alternate; }
@keyframes pulse { from { opacity: 1; } to { opacity: 0.4; } }

/*
 * STUB: audio-player styles for <audio> element wrappers
 * Uncomment and complete when .mp3 playback is needed.
 *
 * .audio-player { ... }
 * .audio-player audio { width: 100%; ... }
 */

/* ── SLOW MODE BUTTON ──
 * Injected inline into the <header> <p> tag by quiz.js at init time.
 * Full opacity by default (available/inviting).
 * Dimmed when slow mode is ON (.rate-btn--active) — engaged, tap to cancel.
 * Brightens to full on hover regardless of state.
 */
.rate-label {
  font-size: 0.9rem;
  color: var(--subtext);
  white-space: nowrap;
}
.rate-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px;
  border-radius: 4px;
  min-width: var(--tap-min);
  min-height: var(--tap-min);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  opacity: 1;
  transition: opacity 0.2s;
  vertical-align: middle;
}
.rate-btn:hover        { opacity: 1; }
.rate-btn--active      { opacity: 0.35; }

/* ── ANSWER OPTIONS ── */
.options {
  padding: 14px 18px 18px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

/*
 * Each answer is an .option-row: a flex container holding
 * the speaker button and the selectable answer button side by side.
 */
.option-row {
  display: flex;
  align-items: stretch;
  gap: 8px;
}

.option-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;                      /* fills remaining width after speaker button */
  min-height: var(--tap-min);   /* 44px tap target */
  padding: 11px 16px;
  border: 2px solid #ddd;
  border-radius: var(--radius-btn);
  background: var(--neutral);
  cursor: pointer;
  font-family: inherit;
  font-size: 1rem;
  color: var(--text);
  text-align: left;
  transition: border-color 0.15s, background 0.15s;
}
.option-btn:hover:not(:disabled) {
  border-color: var(--accent-mid);
  background: var(--accent-light);
}
.option-btn .letter {
  font-weight: 900;
  font-size: 0.85rem;
  color: var(--subtext);
  min-width: 20px;
}
.option-btn.correct {
  border-color: var(--correct);
  background: var(--correct-bg);
  color: var(--correct);
  font-weight: 700;
}
.option-btn.wrong {
  border-color: var(--wrong);
  background: var(--wrong-bg);
  color: var(--wrong);
  text-decoration: line-through;
}
.option-btn:disabled { cursor: default; }

/* ── FEEDBACK BAR ── */
.feedback {
  max-width: var(--max-width);
  margin: 0 auto 14px;
  padding: 11px 16px;
  border-radius: var(--radius-btn);
  font-size: 0.92rem;
  font-weight: 700;
  display: none;
}
.feedback.show    { display: block; }
.feedback.correct { background: var(--correct-bg); color: var(--correct);  border: 1.5px solid var(--accent-border); }
.feedback.wrong   { background: var(--wrong-bg);   color: var(--wrong);    border: 1.5px solid var(--wrong-border); }

/* ── NAV BUTTONS ── */
.nav-row {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 12px;
}
.nav-btn {
  min-height: var(--tap-min);
  padding: 11px 28px;
  border: none;
  border-radius: var(--radius-btn);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s;
  text-align: center;
  line-height: 1.4;
}
#btn-prev               { background: #e0e0e0; color: var(--subtext); }
#btn-prev:hover         { background: #ccc; }
#btn-next               { background: var(--accent-mid); color: #fff; margin-left: auto; }
#btn-next:hover         { background: var(--accent-dark); }
#btn-next:disabled      { background: #aaa; cursor: default; }

/* ── END SCREEN ── */
.end-screen {
  max-width: var(--max-width);
  margin: 0 auto;
  background: var(--card-bg);
  border-radius: var(--radius-card);
  border: 1.5px solid var(--accent-border);
  padding: 36px 28px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  display: none;
}
.end-screen h2 { font-size: 1.4rem; font-weight: 900; color: var(--accent-dark); margin-bottom: 10px; }
.end-screen p  { font-size: 1rem;   color: var(--subtext); margin-bottom: 22px; }
.restart-btn {
  min-height: var(--tap-min);
  background: var(--accent-mid);
  color: #fff;
  border: none;
  border-radius: var(--radius-btn);
  padding: 11px 30px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s;
  margin: 0 6px;
}
.restart-btn:hover { background: var(--accent-dark); }

/*
 * STUBS — future interaction types
 *
 * STUB: drag-drop.css
 *   .drag-item { ... }
 *   .drop-zone { ... }
 *   .drop-zone.over { ... }
 *
 * STUB: flashcard.css
 *   .flashcard-wrap { perspective: 800px; }
 *   .flashcard { transform-style: preserve-3d; transition: transform 0.5s; }
 *   .flashcard.flipped { transform: rotateY(180deg); }
 *   .flashcard-front, .flashcard-back { backface-visibility: hidden; }
 *
 * STUB: imagemap.css
 *   .imagemap-wrap { position: relative; display: inline-block; }
 *   .imagemap-target { position: absolute; cursor: pointer; ... }
 */