@import url('https://fonts.googleapis.com/css2?family=Fredoka:wght@400;500;600;700&family=Noto+Sans+TC:wght@400;500;700&display=swap');

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

:root {
  --primary: #6C5CE7;
  --secondary: #FD79A8;
  --accent: #00CEC9;
  --yellow: #FDCB6E;
  --green: #6BCB77;
  --red: #FF6B6B;
  --blue: #4D96FF;
  --bg: #DFE6E9;
  --card: #FFFFFF;
  --text: #2D3436;
  --shadow: 0 8px 32px rgba(0,0,0,0.15);
  --radius: 20px;
}

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  font-family: 'Fredoka', 'Noto Sans TC', sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  color: var(--text);
}

/* Screens */
.screen {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 10;
}
.screen.active { display: flex; }

/* ─── Menu ─────────────────── */
#screen-menu {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(160deg, #667eea 0%, #764ba2 40%, #f093fb 100%);
  gap: 20px;
}

.menu-title {
  text-align: center;
  animation: bounceIn 0.8s ease;
}
.menu-title h1 {
  font-size: clamp(2rem, 6vw, 3.5rem);
  color: #fff;
  text-shadow: 3px 3px 0 #6C5CE7, 6px 6px 0 rgba(0,0,0,0.2);
  line-height: 1.2;
}
.menu-title p {
  font-size: 1.2rem;
  color: rgba(255,255,255,0.9);
  margin-top: 8px;
}
.menu-emoji {
  font-size: 4rem;
  animation: float 3s ease-in-out infinite;
}

.menu-buttons {
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
}

.btn {
  font-family: inherit;
  font-size: 1.2rem;
  font-weight: 600;
  padding: 14px 40px;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  box-shadow: var(--shadow);
  min-width: 260px;
}
.btn:hover { transform: scale(1.05) translateY(-2px); }
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: linear-gradient(135deg, var(--yellow), #F39C12);
  color: #fff;
}
.btn-secondary {
  background: linear-gradient(135deg, var(--accent), #00B894);
  color: #fff;
}
.btn-danger {
  background: linear-gradient(135deg, var(--red), #EE5A24);
  color: #fff;
}
.btn-purple {
  background: linear-gradient(135deg, var(--primary), #A29BFE);
  color: #fff;
}
.btn-outline {
  background: rgba(255,255,255,0.2);
  color: #fff;
  border: 2px solid rgba(255,255,255,0.5);
  backdrop-filter: blur(10px);
}
.btn-exit {
  background: #2D3436;
  color: #fff;
  border: none;
  font-weight: 700;
  letter-spacing: 0.5px;
}
.btn-exit:hover { background: #111; }
.modal-box .btn-outline,
.result-box .btn-outline {
  background: #EEF2FF;
  color: #4C1D95;
  border: 3px solid #6C5CE7;
}

.btn-sound {
  position: fixed;
  top: 16px; right: 16px;
  z-index: 100;
  width: 48px; height: 48px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.3);
  font-size: 1.4rem;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: transform 0.15s;
}
.btn-sound:hover { transform: scale(1.1); }

.btn-voice {
  position: fixed;
  top: 16px; right: 72px;
  z-index: 100;
  width: 48px; height: 48px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.3);
  font-size: 1.4rem;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: transform 0.15s;
}
.btn-voice:hover { transform: scale(1.1); }

.menu-progress {
  margin-top: 12px !important;
  font-size: 0.95rem !important;
  background: rgba(255,255,255,0.2);
  display: inline-block;
  padding: 6px 16px;
  border-radius: 20px;
}

.star-row { margin-top: 6px; font-size: 0.9rem; letter-spacing: 2px; }

.timer-track {
  width: 120px;
  height: 8px;
  background: rgba(0,0,0,0.12);
  border-radius: 8px;
  margin-top: 6px;
  overflow: hidden;
}
.timer-bar {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, #6BCB77, #00CEC9);
  border-radius: 8px;
  transition: width 0.3s linear, background 0.3s;
}
.timer-bar.warn { background: linear-gradient(90deg, #FDCB6E, #F39C12); }
.timer-bar.danger { background: linear-gradient(90deg, #FF6B6B, #EE5A24); }

.btn-speak { background: linear-gradient(135deg, #00CEC9, #0984E3) !important; }
.btn-pause { background: linear-gradient(135deg, #FDCB6E, #E17055) !important; }
.btn-quit { background: linear-gradient(135deg, #b2bec3, #636e72) !important; }

.mini-speak {
  border: none;
  background: #E8DAFF;
  border-radius: 50%;
  width: 28px; height: 28px;
  cursor: pointer;
  font-size: 0.8rem;
  vertical-align: middle;
  margin-left: 6px;
}
.mini-speak:hover { background: #D0BFFF; }

.result-stars {
  font-size: 2rem;
  letter-spacing: 4px;
  margin: 8px 0;
}

/* ─── Character Select ─────── */
#screen-characters {
  flex-direction: column;
  background: transparent;
  padding: 20px;
  overflow-y: auto;
}
.char-preview-bg {
  position: fixed;
  inset: 0;
  background: linear-gradient(160deg, rgba(161,140,209,0.7), rgba(251,194,235,0.7));
  z-index: -1;
  pointer-events: none;
}
#screen-characters .screen-header,
#screen-characters .char-grid,
#screen-characters .screen-footer {
  position: relative;
  z-index: 2;
}

.screen-header {
  text-align: center;
  color: #fff;
  margin-bottom: 16px;
}
.screen-header h2 { font-size: 2rem; text-shadow: 2px 2px 0 rgba(0,0,0,0.15); }

.char-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
}

.char-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px 12px;
  text-align: center;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, border 0.2s;
  box-shadow: var(--shadow);
  border: 3px solid transparent;
}
.char-card:hover { transform: translateY(-4px); }
.char-card.selected {
  border-color: var(--primary);
  transform: scale(1.05);
  box-shadow: 0 0 0 4px rgba(108,92,231,0.3), var(--shadow);
}
.char-emoji { font-size: 3rem; }
.char-name { font-weight: 700; font-size: 1rem; margin-top: 4px; }
.char-name-zh { font-size: 0.85rem; color: #636e72; }
.char-desc { font-size: 0.75rem; color: var(--primary); margin-top: 4px; }

.char-preview-area {
  width: 100%;
  height: 200px;
  position: relative;
  margin-bottom: 16px;
}
#char-preview-canvas {
  width: 100%;
  height: 100%;
}

.screen-footer {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 20px;
  padding-bottom: 20px;
}

/* ─── Tense Select ─────────── */
#screen-tenses {
  flex-direction: column;
  background: linear-gradient(160deg, #89f7fe, #66a6ff);
  padding: 20px;
  overflow-y: auto;
}

.tense-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  max-width: 1000px;
  margin: 0 auto;
  width: 100%;
}

.tense-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: var(--shadow);
  border-left: 5px solid;
  position: relative;
}
.tense-card:hover { transform: translateY(-4px) scale(1.02); }
.tense-emoji { font-size: 2.5rem; }
.tense-name { font-weight: 700; font-size: 1rem; margin-top: 6px; }
.tense-name-zh { font-size: 0.85rem; color: #636e72; }

.badge {
  display: inline-block;
  font-size: 0.7rem;
  padding: 3px 8px;
  border-radius: 20px;
  margin-top: 8px;
  margin-right: 4px;
}
.badge.taught { background: #DFF9E9; color: #27AE60; }
.badge.new { background: #FFF3CD; color: #F39C12; }
.badge.score { background: #E8DAFF; color: #6C5CE7; }

/* ─── Teaching ─────────────── */
#screen-teach {
  flex-direction: column;
  background: linear-gradient(160deg, #ffecd2, #fcb69f);
  padding: 20px;
  overflow-y: auto;
}

.teach-container {
  max-width: 700px;
  margin: 0 auto;
  width: 100%;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.teach-progress {
  background: rgba(255,255,255,0.4);
  border-radius: 20px;
  height: 12px;
  margin-bottom: 16px;
  overflow: hidden;
}
.teach-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 20px;
  transition: width 0.4s ease;
  width: 0;
}

#teach-content {
  background: var(--card);
  border-radius: var(--radius);
  padding: 30px;
  flex: 1;
  box-shadow: var(--shadow);
  overflow-y: auto;
}

.teach-header { text-align: center; }
.teach-big-emoji { font-size: 4rem; display: block; margin-bottom: 8px; }
.teach-sub { color: #636e72; margin-top: 8px; font-size: 1.1rem; }

.formula-box {
  background: linear-gradient(135deg, #E8DAFF, #FFEEF8);
  padding: 16px;
  border-radius: 12px;
  text-align: center;
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: 20px;
  color: var(--primary);
}

.teach-list { list-style: none; padding: 0; }
.teach-list li {
  padding: 12px 16px;
  margin: 8px 0;
  background: #F8F9FA;
  border-radius: 12px;
  border-left: 4px solid var(--primary);
  font-size: 1rem;
  line-height: 1.5;
}

.example-card {
  background: #F0F9FF;
  border-radius: 12px;
  padding: 16px;
  margin: 10px 0;
  border-left: 4px solid var(--blue);
}
.ex-en { font-weight: 600; font-size: 1.1rem; }
.ex-zh { color: #636e72; margin-top: 4px; }

.signal-words {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0;
}
.signal-tag {
  background: linear-gradient(135deg, var(--yellow), #F39C12);
  color: #fff;
  padding: 8px 16px;
  border-radius: 20px;
  font-weight: 600;
  font-size: 0.9rem;
}
.teach-tip {
  text-align: center;
  color: var(--primary);
  font-weight: 500;
  margin-top: 16px;
}

.ready-box { text-align: center; padding: 20px; }
.ready-emoji { font-size: 5rem; animation: float 2s ease-in-out infinite; }

.teach-nav {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 16px;
  flex-wrap: wrap;
}
.teach-slide-num {
  text-align: center;
  color: rgba(255,255,255,0.8);
  font-size: 0.9rem;
  margin-top: 8px;
}

/* ─── Game ─────────────────── */
#screen-game {
  flex-direction: column;
  pointer-events: none;
  background: transparent;
}

#game-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  z-index: 1;
  display: none;
  pointer-events: auto;
}

.game-hud {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 12px 16px;
  pointer-events: none;
}

.hud-panel {
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  padding: 10px 16px;
  box-shadow: var(--shadow);
  pointer-events: auto;
}
.hud-panel div { font-size: 0.9rem; font-weight: 600; }
.hud-score { color: var(--primary); font-size: 1.2rem !important; }

.question-panel {
  position: fixed;
  top: 86px;
  bottom: auto;
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-radius: var(--radius);
  padding: 12px 22px;
  text-align: center;
  box-shadow: var(--shadow);
  max-width: 90%;
  min-width: 280px;
  pointer-events: none;
}
#question-text {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
}
#question-hint {
  font-size: 0.85rem;
  color: #636e72;
  margin-top: 6px;
}
#q-progress {
  font-size: 0.8rem;
  color: var(--primary);
  margin-top: 4px;
}

.game-controls {
  position: fixed;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
  max-width: 95vw;
  pointer-events: auto;
}

.btn-regen {
  background: linear-gradient(135deg, #A29BFE, var(--primary));
  color: #fff;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 10px 16px;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.15s;
  pointer-events: auto;
  min-width: auto;
}
.btn-regen:hover { transform: scale(1.05); }

.crosshair {
  position: fixed;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  z-index: 15;
  pointer-events: none;
  width: 40px; height: 40px;
}
.crosshair::before, .crosshair::after {
  content: '';
  position: absolute;
  background: rgba(255,255,255,0.8);
  box-shadow: 0 0 4px rgba(0,0,0,0.3);
}
.crosshair::before {
  width: 2px; height: 24px;
  top: 8px; left: 19px;
}
.crosshair::after {
  width: 24px; height: 2px;
  top: 19px; left: 8px;
}

.muzzle-flash {
  position: fixed;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 60px; height: 60px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,200,0,0.8), transparent);
  z-index: 16;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.05s;
}
.muzzle-flash.active { opacity: 1; }

.feedback-msg {
  position: fixed;
  top: 30%;
  left: 50%;
  transform: translateX(-50%) scale(0.8);
  z-index: 30;
  padding: 16px 32px;
  border-radius: 50px;
  font-size: 1.3rem;
  font-weight: 700;
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
}
.feedback-msg.show {
  opacity: 1;
  transform: translateX(-50%) scale(1);
}
.feedback-msg.correct { background: var(--green); color: #fff; }
.feedback-msg.wrong { background: var(--red); color: #fff; }
.feedback-msg.info { background: var(--blue); color: #fff; }

/* ─── Result ───────────────── */
#screen-result {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(160deg, #667eea, #764ba2);
  gap: 16px;
}
.result-box {
  background: var(--card);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
  box-shadow: var(--shadow);
  max-width: 400px;
  animation: bounceIn 0.6s ease;
}
#result-icon { font-size: 5rem; }
#result-title { font-size: 2rem; font-weight: 700; margin: 12px 0; color: var(--primary); }
#result-score { font-size: 1.5rem; font-weight: 600; color: var(--green); }
#result-detail { color: #636e72; margin-top: 8px; }
.result-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 20px;
  align-items: center;
}

/* ─── Modals ───────────────── */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 50;
  background: rgba(0,0,0,0.5);
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}
.modal.active { display: flex; }

.modal-box {
  background: var(--card);
  border-radius: var(--radius);
  padding: 30px;
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--shadow);
  animation: bounceIn 0.4s ease;
}
.modal-box h2 { text-align: center; margin-bottom: 16px; color: var(--primary); }
.modal-close {
  display: block;
  margin: 16px auto 0;
}

.how-steps { list-style: none; }
.how-steps li {
  padding: 10px 0;
  border-bottom: 1px solid #eee;
  font-size: 1rem;
  line-height: 1.5;
}
.how-steps li:last-child { border: none; }

.level-btn {
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  padding: 16px;
  border: none;
  border-radius: 16px;
  color: #fff;
  cursor: pointer;
  transition: transform 0.15s;
  text-align: center;
  line-height: 1.6;
  min-width: 140px;
}
.level-btn:hover { transform: scale(1.05); }

#level-grid {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 16px;
}

/* ─── Animations ───────────── */
@keyframes bounceIn {
  0% { transform: scale(0.5); opacity: 0; }
  70% { transform: scale(1.05); }
  100% { transform: scale(1); opacity: 1; }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.2); border-radius: 3px; }

@media (max-width: 600px) {
  .game-controls { bottom: 8px; gap: 6px; }
  .btn-regen { padding: 8px 12px; font-size: 0.8rem; }
  .question-panel { top: 78px; bottom: auto; padding: 12px 16px; min-width: 0; width: 92%; }
  #question-text { font-size: 1.05rem; }
  .teach-nav { gap: 8px; }
  .btn { min-width: 120px; padding: 12px 18px; font-size: 1rem; }
  .btn-voice { right: 68px; width: 42px; height: 42px; }
  .btn-sound { width: 42px; height: 42px; }
}