/* ============================================================
   CLOCK TEACHER — Mobile-first stylesheet
   ============================================================ */

/* --- Custom properties ------------------------------------ */
:root {
  --primary:        #4A6FD4;
  --primary-dark:   #3355BB;
  --secondary:      #FF9800;
  --secondary-dark: #E65100;
  --green:          #43A047;
  --green-dark:     #2E7D32;
  --red:            #E53935;
  --bg:             #EEF2FF;
  --card-bg:        #FFFFFF;
  --text:           #212121;
  --text-muted:     #757575;
  --border:         #C5CAE9;
  --shadow:         rgba(63, 81, 181, 0.2);

  /* Clock colours */
  --clock-face:     #FFFDE7;
  --clock-border:   #3F51B5;
  --am-num:         #1A237E;
  --pm-num:         #B71C1C;
  --hour-hand:      #1565C0;
  --min-hand:       #C62828;

  --radius-lg:  1.2rem;
  --radius-md:  0.8rem;
  --radius-sm:  0.5rem;

  --transition: 0.2s ease;
}

/* --- Reset & base ----------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

#app {
  height: 100%;
  position: relative;
  overflow: hidden;
}

/* --- Screen system ---------------------------------------- */
.screen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  transform: translateX(30px);
  overflow-y: auto;
  overflow-x: hidden;
}

.screen.active {
  opacity: 1;
  pointer-events: all;
  transform: translateX(0);
}

/* --- Language switcher ------------------------------------ */
.lang-switcher {
  display: flex;
  gap: 0.3rem;
}

.lang-btn {
  padding: 0.35rem 0.75rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  letter-spacing: 0.03em;
}

.lang-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.lang-btn:not(.active):hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* ============================================================
   HOME SCREEN
   ============================================================ */
#screen-home {
  background: linear-gradient(160deg, #dbe8ff 0%, #f0e8ff 100%);
}

.home-header {
  display: flex;
  justify-content: flex-end;
  padding: 1rem 1.2rem 0;
}

.home-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1rem 1.2rem 2rem;
  gap: 0.6rem;
}

.app-logo {
  font-size: clamp(3rem, 15vw, 5rem);
  line-height: 1;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.15));
}

.app-title {
  font-size: clamp(1.5rem, 6vw, 2.5rem);
  font-weight: 800;
  color: var(--primary-dark);
  text-align: center;
}

.app-subtitle {
  font-size: clamp(0.9rem, 3.5vw, 1.2rem);
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 0.5rem;
}

.game-grid {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  width: 100%;
  max-width: 420px;
}

.game-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.3rem;
  background: var(--card-bg);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  box-shadow: 0 4px 16px var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  text-align: left;
}

.game-card:active {
  transform: scale(0.97);
  box-shadow: 0 2px 8px var(--shadow);
}

.game-card:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

.card-1 { border-left: 5px solid #4A6FD4; }
.card-2 { border-left: 5px solid #FF9800; }
.card-3 { border-left: 5px solid #43A047; }

.game-icon {
  font-size: clamp(2rem, 8vw, 2.8rem);
  flex-shrink: 0;
  line-height: 1;
}

.game-card-title {
  font-size: clamp(1rem, 4.5vw, 1.3rem);
  font-weight: 700;
  color: var(--text);
}

.game-card-desc {
  font-size: clamp(0.8rem, 3vw, 0.95rem);
  color: var(--text-muted);
  margin-top: 0.15rem;
}

/* ============================================================
   GAME SCREENS — shared header / level bar
   ============================================================ */
.game-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 1rem;
  background: var(--primary);
  color: #fff;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.18);
}

.btn-back {
  background: rgba(255,255,255,0.2);
  border: none;
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 1.3rem;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--transition);
}

.btn-back:hover { background: rgba(255,255,255,0.35); }
.btn-back:active { background: rgba(255,255,255,0.1); }

.game-header-title {
  flex: 1;
  font-size: clamp(0.95rem, 4vw, 1.25rem);
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* --- Level bar -------------------------------------------- */
.level-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  background: #fff;
  border-bottom: 2px solid var(--border);
  flex-shrink: 0;
  flex-wrap: wrap;
}

.level-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.level-btns {
  display: flex;
  gap: 0.35rem;
}

.level-btn {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: transparent;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-muted);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.level-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.level-btn:not(.active):hover {
  border-color: var(--primary);
  color: var(--primary);
}

.level-name {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.score-display {
  margin-left: auto;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary);
}

/* --- Clock wrapper ---------------------------------------- */
.clock-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem;
  min-height: 0;
}

.clock-wrap canvas {
  width: min(85vw, 85vh - 220px, 360px);
  height: min(85vw, 85vh - 220px, 360px);
  max-width: 360px;
  max-height: 360px;
  touch-action: none;
  border-radius: 50%;
  filter: drop-shadow(0 6px 18px rgba(63,81,181,0.25));
}

/* --- Game controls --------------------------------------- */
.game-controls {
  padding: 0.8rem 1rem 1.2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.7rem;
  flex-shrink: 0;
}

/* Hear-answer button */
.btn-hear {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  max-width: 360px;
  padding: 0.9rem 1.5rem;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-size: clamp(1rem, 4.5vw, 1.2rem);
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(74,111,212,0.4);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

.btn-hear:hover  { background: var(--primary-dark); }
.btn-hear:active { transform: scale(0.97); box-shadow: none; }

/* Answer text display */
.answer-display {
  font-size: clamp(1.1rem, 5vw, 1.5rem);
  font-weight: 800;
  color: var(--primary-dark);
  text-align: center;
  min-height: 1.8rem;
  transition: opacity 0.3s;
}

/* Next button */
.btn-next {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  max-width: 360px;
  padding: 0.8rem 1.5rem;
  background: var(--secondary);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-size: clamp(0.95rem, 4vw, 1.1rem);
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 3px 10px rgba(255,152,0,0.35);
  transition: background var(--transition), transform var(--transition);
}

.btn-next:hover  { background: var(--secondary-dark); }
.btn-next:active { transform: scale(0.97); }

/* ============================================================
   GAME 2 — Set the Clock
   ============================================================ */
.target-time-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.5rem 1rem;
  flex-shrink: 0;
}

.target-label {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
}

.target-time {
  font-size: clamp(2rem, 9vw, 3rem);
  font-weight: 800;
  color: var(--primary-dark);
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

.btn-speak-small {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.2rem;
  line-height: 1;
  opacity: 0.7;
  transition: opacity var(--transition);
}
.btn-speak-small:hover { opacity: 1; }

.hint-text {
  font-size: 1rem;
  font-weight: 700;
  text-align: center;
  min-height: 1.4rem;
  color: var(--text-muted);
  transition: color 0.3s;
}

.hint-text.correct { color: var(--green); }
.hint-text.wrong   { color: var(--red); }

.g2-button-row {
  display: flex;
  gap: 0.7rem;
  width: 100%;
  max-width: 360px;
}

.btn-check {
  flex: 1;
  padding: 0.85rem 1rem;
  background: var(--green);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-size: clamp(0.95rem, 4vw, 1.1rem);
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 3px 10px rgba(67,160,71,0.35);
  transition: background var(--transition), transform var(--transition);
}
.btn-check:hover  { background: var(--green-dark); }
.btn-check:active { transform: scale(0.97); }

/* ============================================================
   GAME 3 — Multiple Choice
   ============================================================ */
.choices-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
  padding: 0.8rem 1rem;
  flex-shrink: 0;
}

.choice-btn {
  padding: 1rem 0.5rem;
  background: var(--card-bg);
  border: 3px solid var(--border);
  border-radius: var(--radius-md);
  font-size: clamp(1rem, 5vw, 1.4rem);
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
  box-shadow: 0 2px 8px var(--shadow);
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.03em;
}

.choice-btn:hover  { border-color: var(--primary); color: var(--primary); }
.choice-btn:active { transform: scale(0.97); }
.choice-btn.correct { background: #E8F5E9; border-color: var(--green); color: var(--green-dark); }
.choice-btn.wrong   { background: #FFEBEE; border-color: var(--red);   color: var(--red); }

.feedback-display {
  text-align: center;
  font-size: clamp(1.1rem, 5vw, 1.4rem);
  font-weight: 800;
  min-height: 2rem;
  padding: 0.5rem 1rem 1rem;
  transition: color 0.3s;
  flex-shrink: 0;
}

.feedback-display.correct { color: var(--green); }
.feedback-display.wrong   { color: var(--red); }

/* ============================================================
   UTILITY — Animations
   ============================================================ */
@keyframes popIn {
  0%   { transform: scale(0.85); opacity: 0; }
  70%  { transform: scale(1.06); }
  100% { transform: scale(1);    opacity: 1; }
}

.pop-in { animation: popIn 0.3s ease forwards; }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60%  { transform: translateX(-6px); }
  40%, 80%  { transform: translateX(6px); }
}

.shake { animation: shake 0.4s ease; }

/* ============================================================
   DESKTOP — wider layout
   ============================================================ */
@media (min-width: 600px) {
  .home-main {
    justify-content: flex-start;
    padding-top: 2rem;
  }

  .game-grid {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
  }

  .game-card {
    flex-direction: column;
    width: 160px;
    align-items: center;
    text-align: center;
    padding: 1.5rem 1rem;
  }

  .game-card-desc {
    display: block;
  }

  .clock-wrap canvas {
    max-width: 400px;
    max-height: 400px;
  }

  .choices-grid {
    max-width: 480px;
    margin: 0 auto;
  }

  .game-controls {
    padding-bottom: 2rem;
  }
}