/* ============================================
   MATH CHAMP — Styles
   ============================================ */

:root {
  --purple: #6c5ce7;
  --purple-dark: #5a4bd1;
  --pink: #e84393;
  --orange: #f39c12;
  --green: #00b894;
  --red: #e74c3c;
  --blue: #0984e3;
  --bg-start: #6c5ce7;
  --bg-end: #a29bfe;
  --text: #2d3436;
  --text-light: #636e72;
  --white: #ffffff;
  --shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.2);
  --radius: 1rem;
  --radius-sm: 0.75rem;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
}

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, var(--bg-start), var(--bg-end));
  color: var(--text);
  min-height: 100dvh;
}

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

/* ============================================
   SCREENS
   ============================================ */

.screen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  opacity: 0;
  pointer-events: none;
  transform: scale(0.95);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.screen.active {
  opacity: 1;
  pointer-events: auto;
  transform: scale(1);
}

/* ============================================
   HOME SCREEN
   ============================================ */

.home-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: safe center;
  padding: 1.5rem;
  gap: 2rem;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.logo {
  text-align: center;
}

.logo-icon {
  font-size: 4rem;
  display: block;
  animation: pulse 2s ease-in-out infinite;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.2));
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.logo h1 {
  font-size: 2.625rem;
  font-weight: 800;
  color: var(--white);
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  margin-top: 0.5rem;
}

.subtitle {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1.125rem;
  margin-top: 0.25rem;
}

/* ============================================
   MENU BUTTONS
   ============================================ */

.menu-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  width: 100%;
  max-width: 21.25rem;
}

.btn {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: var(--shadow);
  text-align: left;
  position: relative;
  overflow: hidden;
}

.btn:active {
  transform: scale(0.97);
}

.btn-icon {
  font-size: 1.75rem;
  flex-shrink: 0;
}

.btn-label {
  font-weight: 700;
  font-size: 1.125rem;
  display: block;
}

.btn-desc {
  font-size: 0.8125rem;
  opacity: 0.7;
  display: block;
}

.btn-play {
  background: var(--white);
  color: var(--purple);
}

.btn-practice {
  background: var(--white);
  color: var(--blue);
}

.btn-challenge {
  background: var(--white);
  color: var(--orange);
}

/* ============================================
   STATS BAR
   ============================================ */

.stats-bar {
  display: flex;
  gap: 1.5rem;
  padding: 1rem 1.5rem;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(0.625rem);
  -webkit-backdrop-filter: blur(0.625rem);
  border-radius: var(--radius);
}

.stat {
  text-align: center;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--white);
  display: block;
}

.stat-label {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.7);
  text-transform: uppercase;
  letter-spacing: 0.0313rem;
}

/* ============================================
   TABLE PICKER
   ============================================ */

.picker-content {
  flex: 1;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.picker-content h2 {
  color: var(--white);
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
}

.back-btn {
  align-self: flex-start;
  background: rgba(255, 255, 255, 0.2);
  border: none;
  color: var(--white);
  font-size: 1rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: 1.25rem;
  cursor: pointer;
  margin-bottom: 1rem;
  transition: background 0.2s;
}

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

.table-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  width: 100%;
  max-width: 21.25rem;
}

.table-btn {
  aspect-ratio: 1;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1.75rem;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.15s ease;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  position: relative;
}

.table-btn:active {
  transform: scale(0.95);
}

.table-btn .mastery {
  font-size: 0.625rem;
  font-weight: 600;
  opacity: 0.7;
}

.table-btn .mastery-star {
  position: absolute;
  top: 0.375rem;
  right: 0.375rem;
  font-size: 1rem;
}

.table-btn-1  { background: #ff6b6b; color: white; }
.table-btn-2  { background: #ee5a24; color: white; }
.table-btn-3  { background: #f39c12; color: white; }
.table-btn-4  { background: #fdcb6e; color: #5a4e3a; }
.table-btn-5  { background: #00b894; color: white; }
.table-btn-6  { background: #00cec9; color: white; }
.table-btn-7  { background: #0984e3; color: white; }
.table-btn-8  { background: #6c5ce7; color: white; }
.table-btn-9  { background: #e84393; color: white; }
.table-btn-10 { background: #fd79a8; color: white; }
.table-btn-11 { background: #636e72; color: white; }
.table-btn-12 { background: #2d3436; color: white; }

/* ============================================
   GAME SCREEN
   ============================================ */

.game-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  gap: 0.75rem;
}

.game-header .back-btn {
  margin-bottom: 0;
  font-size: 1.25rem;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.game-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.streak {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--white);
}

.streak-fire {
  font-size: 1.5rem;
  transition: transform 0.2s ease;
}

.streak-fire.big {
  transform: scale(1.5);
}

.score {
  font-size: 1rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.8);
}

.timer {
  background: rgba(255, 255, 255, 0.2);
  padding: 0.5rem 1rem;
  border-radius: 1.25rem;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--white);
}

.timer.warning {
  background: var(--red);
  animation: timerPulse 0.5s ease-in-out infinite;
}

@keyframes timerPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.game-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 1.25rem 1.5rem;
  gap: 1.5rem;
}

/* ============================================
   PROBLEM DISPLAY
   ============================================ */

.problem-container {
  text-align: center;
}

.problem {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  font-size: 3rem;
  font-weight: 800;
  color: var(--white);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  transition: transform 0.2s ease;
}

.problem.correct {
  animation: correctBounce 0.5s ease;
}

.problem.wrong {
  animation: wrongShake 0.4s ease;
}

@keyframes correctBounce {
  0% { transform: scale(1); }
  30% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

@keyframes wrongShake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-0.75rem); }
  40% { transform: translateX(0.75rem); }
  60% { transform: translateX(-0.5rem); }
  80% { transform: translateX(0.5rem); }
}

.problem-answer {
  min-width: 5rem;
  padding: 0.25rem 0.75rem;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  display: inline-block;
}

.problem-answer.has-value {
  background: rgba(255, 255, 255, 0.3);
}

.feedback {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 0.75rem;
  min-height: 2.25rem;
  color: var(--white);
  transition: opacity 0.2s;
}

.feedback.correct-fb {
  color: #55efc4;
}

.feedback.wrong-fb {
  color: #fab1a0;
}

/* ============================================
   NUMPAD
   ============================================ */

.numpad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.625rem;
  max-width: 20rem;
  margin: 0 auto;
  width: 100%;
}

.num-btn {
  height: 4rem;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1.5rem;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.9);
  color: var(--text);
  cursor: pointer;
  transition: transform 0.1s ease, background 0.1s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.num-btn:active {
  transform: scale(0.93);
  background: rgba(255, 255, 255, 1);
}

.num-btn-clear {
  background: rgba(255, 255, 255, 0.5);
  font-size: 1.375rem;
}

.num-btn-go {
  background: var(--green);
  color: var(--white);
  font-size: 1.25rem;
  font-weight: 800;
}

.num-btn-go:active {
  background: #00a884;
}

/* ============================================
   RESULTS SCREEN
   ============================================ */

.results-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  gap: 1.5rem;
}

.results-header {
  text-align: center;
}

.results-emoji {
  font-size: 4rem;
  display: block;
  animation: pulse 2s ease-in-out infinite;
}

.results-header h2 {
  font-size: 2rem;
  color: var(--white);
  margin-top: 0.5rem;
}

.results-stats {
  display: flex;
  gap: 1.5rem;
  padding: 1.25rem 2rem;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(0.625rem);
  -webkit-backdrop-filter: blur(0.625rem);
  border-radius: var(--radius);
}

.result-stat {
  text-align: center;
}

.result-stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--white);
  display: block;
}

.result-stat-label {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.7);
  text-transform: uppercase;
  letter-spacing: 0.0313rem;
}

.trouble-spots {
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  width: 100%;
  max-width: 21.25rem;
}

.trouble-spots h3 {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.0625rem;
  margin-bottom: 0.75rem;
}

.trouble-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.9);
  font-size: 1rem;
  font-weight: 600;
}

.trouble-item:last-child {
  border-bottom: none;
}

.trouble-item .correct-answer {
  color: #55efc4;
}

.results-buttons {
  display: flex;
  gap: 0.75rem;
  width: 100%;
  max-width: 21.25rem;
}

.results-buttons .btn {
  flex: 1;
  justify-content: center;
  text-align: center;
}

.results-buttons .btn-label {
  font-size: 1rem;
}

/* ============================================
   DAILY STREAK
   ============================================ */

.daily-streak {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(0.625rem);
  -webkit-backdrop-filter: blur(0.625rem);
  padding: 0.5rem 1.25rem;
  border-radius: 1.5rem;
}

.daily-fire {
  font-size: 1.5rem;
  animation: pulse 2s ease-in-out infinite;
}

.daily-count {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--white);
}

.daily-label {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.8);
  font-weight: 600;
}

/* ============================================
   EXTRA MENU BUTTONS
   ============================================ */

.btn-progress {
  background: var(--white);
  color: #00b894;
}

.btn-scores {
  background: var(--white);
  color: #e84393;
}

.btn-review {
  background: var(--white);
  color: #e74c3c;
  width: 100%;
}

/* ============================================
   MASCOT
   ============================================ */

.mascot {
  font-size: 3rem;
  text-align: center;
  transition: transform 0.3s ease;
  filter: drop-shadow(0 2px 6px rgba(0,0,0,0.15));
}

.mascot.bounce {
  animation: mascotBounce 0.5s ease;
}

.mascot.shake {
  animation: mascotShake 0.4s ease;
}

.mascot.dance {
  animation: mascotDance 0.8s ease;
}

@keyframes mascotBounce {
  0%   { transform: translateY(0) scale(1); }
  30%  { transform: translateY(-1rem) scale(1.2); }
  50%  { transform: translateY(-0.5rem) scale(1.1); }
  100% { transform: translateY(0) scale(1); }
}

@keyframes mascotShake {
  0%, 100% { transform: rotate(0deg); }
  20% { transform: rotate(-12deg); }
  40% { transform: rotate(12deg); }
  60% { transform: rotate(-8deg); }
  80% { transform: rotate(8deg); }
}

@keyframes mascotDance {
  0%   { transform: translateY(0) rotate(0deg); }
  20%  { transform: translateY(-0.625rem) rotate(-8deg); }
  40%  { transform: translateY(0) rotate(8deg); }
  60%  { transform: translateY(-0.625rem) rotate(-8deg); }
  80%  { transform: translateY(0) rotate(8deg); }
  100% { transform: translateY(0) rotate(0deg); }
}

/* ============================================
   PROGRESS MAP
   ============================================ */

.progress-content {
  flex: 1;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.progress-content h2 {
  color: var(--white);
  font-size: 1.75rem;
  margin-bottom: 0.25rem;
}

.progress-subtitle {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
  margin-bottom: 0.75rem;
}

.progress-legend {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.75rem;
  font-weight: 600;
}

.legend-dot {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 0.1875rem;
}

.legend-new      { background: rgba(255,255,255,0.2); }
.legend-learning { background: #fdcb6e; }
.legend-good     { background: #00b894; }
.legend-mastered { background: #6c5ce7; }

.progress-grid {
  display: grid;
  grid-template-columns: 1.5rem repeat(12, 1fr);
  gap: 0.1875rem;
  width: 100%;
  max-width: 25rem;
}

.grid-header {
  font-size: 0.6875rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
}

.grid-cell {
  aspect-ratio: 1;
  border-radius: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.5625rem;
  font-weight: 700;
  transition: transform 0.15s;
  cursor: default;
}

.grid-cell:hover {
  transform: scale(1.15);
  z-index: 1;
}

.grid-cell.cell-new      { background: rgba(255,255,255,0.15); color: rgba(255,255,255,0.4); }
.grid-cell.cell-learning { background: #fdcb6e; color: #5a4e3a; }
.grid-cell.cell-good     { background: #00b894; color: white; }
.grid-cell.cell-mastered { background: #6c5ce7; color: white; }

.progress-summary {
  margin-top: 1rem;
  padding: 0.75rem 1.25rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.875rem;
  font-weight: 600;
  text-align: center;
}

/* ============================================
   HIGH SCORES
   ============================================ */

.scores-content {
  flex: 1;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.scores-content h2 {
  color: var(--white);
  font-size: 1.75rem;
  margin-bottom: 1.25rem;
}

.scores-section {
  width: 100%;
  max-width: 21.25rem;
  margin-bottom: 1.5rem;
}

.scores-section h3 {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.0625rem;
  margin-bottom: 0.5rem;
}

.scores-list {
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  overflow: hidden;
}

.score-entry {
  display: flex;
  align-items: center;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--white);
}

.score-entry:last-child {
  border-bottom: none;
}

.score-rank {
  font-size: 1.125rem;
  font-weight: 800;
  width: 2rem;
  text-align: center;
}

.score-rank.gold   { color: #fdcb6e; }
.score-rank.silver { color: #dfe6e9; }
.score-rank.bronze { color: #e17055; }

.score-details {
  flex: 1;
  margin-left: 0.75rem;
}

.score-value {
  font-size: 1.125rem;
  font-weight: 700;
}

.score-date {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.5);
}

.score-accuracy {
  font-size: 0.875rem;
  font-weight: 700;
  color: #55efc4;
}

.scores-empty {
  padding: 1.25rem;
  text-align: center;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.875rem;
}

/* ============================================
   NEW HIGH SCORE BANNER
   ============================================ */

.new-high-score {
  font-size: 1.125rem;
  font-weight: 800;
  color: #fdcb6e;
  text-align: center;
  animation: highScorePulse 0.6s ease-in-out infinite alternate;
}

@keyframes highScorePulse {
  from { transform: scale(1); opacity: 0.8; }
  to   { transform: scale(1.05); opacity: 1; }
}

/* ============================================
   CONFETTI
   ============================================ */

#confetti-canvas {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 100;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (min-height: 50rem) {
  .problem {
    font-size: 3.5rem;
  }
  .num-btn {
    height: 4.5rem;
    font-size: 1.75rem;
  }
  .home-content {
    gap: 2.5rem;
  }
  .mascot {
    font-size: 3.5rem;
  }
}

@media (max-height: 37.5rem) {
  .logo-icon { font-size: 2.5rem; }
  .logo h1 { font-size: 2rem; }
  .home-content { gap: 0.75rem; }
  .daily-streak { padding: 0.25rem 0.875rem; }
  .daily-count { font-size: 1.375rem; }
  .menu-buttons { gap: 0.5rem; }
  .btn { padding: 0.75rem 1rem; }
  .problem { font-size: 2.25rem; }
  .num-btn { height: 3.25rem; font-size: 1.25rem; }
  .game-body { gap: 0.5rem; }
  .mascot { font-size: 2rem; }
}

/* Safe area padding for notched devices */
@supports (padding-top: env(safe-area-inset-top)) {
  .game-header {
    padding-top: calc(1rem + env(safe-area-inset-top));
  }
  .home-content {
    padding-top: calc(1.5rem + env(safe-area-inset-top));
  }
  .picker-content {
    padding-top: calc(1.5rem + env(safe-area-inset-top));
  }
  .progress-content {
    padding-top: calc(1.5rem + env(safe-area-inset-top));
  }
  .scores-content {
    padding-top: calc(1.5rem + env(safe-area-inset-top));
  }
  .numpad {
    padding-bottom: env(safe-area-inset-bottom);
  }
}