/* =============================================
   MindWorld School — Flash Number
   Design System Styles
   ============================================= */

:root {
  --primary: #FF7C00;
  --primary-light: #FF9D40;
  --primary-dark: #E86E00;
  --bg: #FDFCF5;
  --surface: #FFFFFF;
  --success: #4CAF50;
  --danger: #FF4444;
  --text: #2D2D2D;
  --text-light: #666666;
  --shadow: rgba(0,0,0,.07);
  --shadow-btn: rgba(255,124,0,0.3);
}

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

html, body {
  height: 100%;
  font-family: 'Nunito', sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
}

body {
  display: flex;
  flex-direction: column;
  height: 100dvh;
}

.app-header {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 2px 12px rgba(0,0,0,.15);
}

.header-title {
  font-size: 1.2rem;
  font-weight: 900;
  letter-spacing: 0.5px;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.sound-toggle {
  background: rgba(255,255,255,.2);
  border: none;
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 1.1rem;
  cursor: pointer;
  transition: background .2s;
  color: #fff;
}
.sound-toggle:hover { background: rgba(255,255,255,.35); }

.lang-capsule {
  display: flex;
  background: rgba(255,255,255,.15);
  border-radius: 50px;
  overflow: hidden;
  padding: 3px;
  gap: 2px;
}
.lang-btn {
  border: none;
  background: transparent;
  color: rgba(255,255,255,.8);
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 0.75rem;
  padding: 4px 9px;
  border-radius: 50px;
  cursor: pointer;
  transition: background .2s, color .2s;
}
.lang-btn.active {
  background: #fff;
  color: var(--primary);
}

.app-main {
  flex: 1;
  overflow-y: auto;
  position: relative;
}

.app-footer {
  flex-shrink: 0;
  background: var(--primary);
  color: #fff;
  text-align: center;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 8px;
}

.screen {
  display: none;
  height: 100%;
  overflow-y: auto;
}
.screen.active { display: block; }

.screen-inner {
  max-width: 540px;
  margin: 0 auto;
  padding: 20px 16px 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.screen-title {
  font-size: 1.5rem;
  font-weight: 900;
  text-align: center;
  color: var(--text);
}

.setting-block {
  background: var(--surface);
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 4px 20px var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.setting-label {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text);
}
.hidden { display: none !important; }

.mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.mode-btn {
  background: var(--bg);
  border: 2px solid transparent;
  border-radius: 12px;
  padding: 12px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--text-light);
  transition: all .2s;
}
.mode-btn .mode-icon { font-size: 1.5rem; }
.mode-btn:hover { border-color: var(--primary-light); color: var(--primary); }
.mode-btn.active {
  border-color: var(--primary);
  background: linear-gradient(135deg, #fff5ec, #fff);
  color: var(--primary);
  box-shadow: 0 2px 10px var(--shadow-btn);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.chip {
  background: var(--bg);
  border: 2px solid #eee;
  border-radius: 50px;
  padding: 6px 16px;
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all .18s;
  color: var(--text-light);
}
.chip:hover { border-color: var(--primary-light); color: var(--primary); }
.chip.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  box-shadow: 0 2px 8px var(--shadow-btn);
}

.time-slider {
  width: 100%;
  -webkit-appearance: none;
  height: 6px;
  border-radius: 3px;
  background: linear-gradient(to right, var(--primary) 0%, var(--primary-light) 100%);
  outline: none;
  cursor: pointer;
}
.time-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 2px 8px var(--shadow-btn);
  cursor: pointer;
}
.time-slider::-moz-range-thumb {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 2px 8px var(--shadow-btn);
  cursor: pointer;
  border: none;
}
.slider-minmax {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-light);
  font-weight: 600;
}

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 0;
}
.toggle-switch { position: relative; display: inline-block; width: 46px; height: 26px; }
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute; cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background: #ccc;
  border-radius: 26px;
  transition: .3s;
}
.toggle-slider:before {
  content: '';
  position: absolute;
  height: 20px; width: 20px;
  left: 3px; bottom: 3px;
  background: white;
  border-radius: 50%;
  transition: .3s;
}
input:checked + .toggle-slider { background: var(--primary); }
input:checked + .toggle-slider:before { transform: translateX(20px); }

.btn-primary {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border: none;
  border-radius: 12px;
  padding: 14px 28px;
  font-family: 'Nunito', sans-serif;
  font-weight: 900;
  font-size: 1rem;
  cursor: pointer;
  box-shadow: 0 4px 15px var(--shadow-btn);
  transition: transform .15s, box-shadow .15s;
  text-align: center;
  width: 100%;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px var(--shadow-btn); }
.btn-primary:active { transform: translateY(0); }
.btn-primary.btn-large { padding: 16px; font-size: 1.1rem; }

.btn-secondary {
  display: inline-block;
  background: var(--surface);
  color: var(--primary);
  border: 2px solid var(--primary);
  border-radius: 12px;
  padding: 12px 24px;
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: background .2s, color .2s;
  text-align: center;
  flex: 1;
}
.btn-secondary:hover { background: var(--primary); color: #fff; }

.confirm-summary {
  background: var(--surface);
  border-radius: 16px;
  padding: 18px;
  box-shadow: 0 4px 20px var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.confirm-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.95rem;
}
.confirm-row span:first-child { color: var(--text-light); }
.confirm-row span:last-child { font-weight: 700; color: var(--text); }
.confirm-btns {
  display: flex;
  gap: 10px;
}

#screen-play {
  display: none;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  position: relative;
}
#screen-play.active { display: flex; }

.hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px 4px;
  font-weight: 700;
  font-size: 0.95rem;
  flex-shrink: 0;
  gap: 8px;
}
.hud-center { color: var(--primary); font-weight: 900; font-size: 1rem; flex: 1; text-align: center; }
.hud-right-group { display: flex; align-items: center; gap: 6px; }

.hud-btn {
  background: rgba(0,0,0,.06);
  border: none;
  border-radius: 8px;
  padding: 4px 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: background .2s;
  line-height: 1;
}
.hud-btn:hover { background: rgba(0,0,0,.13); }
.hud-btn-exit {
  font-size: 0.85rem;
  font-weight: 900;
  color: var(--text-light);
}
.hud-btn-exit:hover { background: rgba(255,68,68,.12); color: var(--danger); }

.progress-bar-wrap {
  height: 6px;
  background: #eee;
  flex-shrink: 0;
  margin: 0 16px;
  border-radius: 3px;
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  border-radius: 3px;
  transition: width linear;
}

.series-progress {
  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-light);
  padding: 4px 0;
  flex-shrink: 0;
}

.play-area {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  overflow: hidden;
}

.phase {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  animation: fadeIn .25s ease;
}

.countdown-number {
  font-size: 7rem;
  font-weight: 900;
  color: var(--primary);
  animation: countdownPulse .8s ease forwards;
}

.number-display {
  font-size: clamp(60px, 15vw, 120px);
  font-weight: 900;
  color: var(--text);
  letter-spacing: 6px;
  animation: numberAppear .3s cubic-bezier(0.34,1.56,0.64,1) forwards;
  text-align: center;
  word-break: break-all;
}
.number-display.disappear { animation: numberDisappear .4s ease forwards; }

.input-prompt {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-light);
  text-align: center;
}
.answer-input {
  width: 100%;
  max-width: 320px;
  font-family: 'Nunito', sans-serif;
  font-size: 2.2rem;
  font-weight: 900;
  text-align: center;
  letter-spacing: 6px;
  padding: 14px;
  border: 3px solid #eee;
  border-radius: 16px;
  outline: none;
  background: var(--surface);
  color: var(--text);
  transition: border-color .2s;
}
.answer-input:focus { border-color: var(--primary); }
.answer-input.correct-anim { border-color: var(--success); animation: correctBounce .4s ease; }
.answer-input.wrong-anim { border-color: var(--danger); animation: wrongShake .4s ease; }

.result-icon { font-size: 3.5rem; }
.result-text {
  font-size: 1.5rem;
  font-weight: 900;
  text-align: center;
}
.result-text.correct { color: var(--success); }
.result-text.wrong { color: var(--danger); }
.result-detail {
  font-size: 1rem;
  color: var(--text-light);
  font-weight: 600;
  text-align: center;
}

.lives-display { display: flex; gap: 4px; font-size: 1.2rem; }
.heart { transition: transform .3s; }
.heart.lost { animation: heartBreak .4s ease forwards; }

/* ---- PAUSE OVERLAY ---- */
.pause-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(253,252,245,.93);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}
.pause-card {
  background: var(--surface);
  border-radius: 20px;
  padding: 32px 28px;
  box-shadow: 0 8px 32px rgba(0,0,0,.12);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 14px;
  width: min(320px, 88vw);
}
.pause-title {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--text);
  text-align: center;
  margin-bottom: 4px;
}

.results-inner { align-items: center; }

.mascot-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.mascot-img {
  width: 100px;
  height: 100px;
  object-fit: contain;
}
.mascot-msg {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  text-align: center;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  width: 100%;
}
.stat-card {
  background: var(--surface);
  border-radius: 16px;
  padding: 14px;
  box-shadow: 0 4px 20px var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  text-align: center;
}
.stat-card.highlight {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
}
.stat-icon { font-size: 1.4rem; }
.stat-value {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--text);
}
.stat-card.highlight .stat-value { color: #fff; font-size: 2.2rem; }
.stat-label { font-size: 0.8rem; font-weight: 600; color: var(--text-light); }
.stat-card.highlight .stat-label { color: rgba(255,255,255,.85); }

.results-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  width: 100%;
}
.results-btns .btn-primary,
.results-btns .btn-secondary { flex: 1; min-width: 120px; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes numberAppear {
  from { transform: scale(0.5); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}
@keyframes numberDisappear {
  from { opacity: 1; filter: blur(0); }
  to { opacity: 0; filter: blur(12px); }
}
@keyframes correctBounce {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.12); }
}
@keyframes wrongShake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-10px); }
  40% { transform: translateX(10px); }
  60% { transform: translateX(-8px); }
  80% { transform: translateX(8px); }
}
@keyframes countdownPulse {
  from { transform: scale(1.5); opacity: 1; }
  to { transform: scale(0.8); opacity: 0; }
}
@keyframes heartBreak {
  0% { transform: scale(1); }
  50% { transform: scale(1.3); }
  100% { transform: scale(0); opacity: 0; }
}

@media (max-width: 480px) {
  .number-display { font-size: clamp(48px, 18vw, 72px); }
  .countdown-number { font-size: 5rem; }
  .answer-input { font-size: 1.8rem; letter-spacing: 4px; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 769px) {
  .number-display { font-size: 110px; }
  .screen-inner { padding: 28px 24px 32px; }
}