/* Reset and Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

:root {
  --bg-dark: #0f172a;
  --bg-darker: #020617;
  --primary: #3b82f6;
  --primary-glow: rgba(59, 130, 246, 0.5);
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.5);
  --warning: #f59e0b;
  --danger: #ef4444;
  --text-light: #f8fafc;
  --text-muted: #94a3b8;
  --card-back-bg: linear-gradient(135deg, #1e293b, #0f172a);
  --card-front-bg: linear-gradient(135deg, #1e293b, #334155);
  --glass-bg: rgba(15, 23, 42, 0.75);
  --glass-border: rgba(255, 255, 255, 0.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  background-color: var(--bg-darker);
  color: var(--text-light);
  overflow: hidden;
  height: 100vh;
  width: 100vw;
}

/* App Layout Shell */
.memory-game {
  display: flex;
  flex-direction: column;
  height: 100%;
  width: 100%;
  max-width: 500px;
  margin: 0 auto;
  position: relative;
  background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-darker) 100%);
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

/* Header Topbar */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 56px 12px 16px;
  border-bottom: 1px solid var(--glass-border);
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(10px);
}

.home-link {
  font-size: 24px;
  color: var(--text-muted);
  text-decoration: none;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all 0.2s ease;
  background: rgba(255, 255, 255, 0.05);
}

.home-link:active {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-light);
  transform: scale(0.95);
}

.topbar h1 {
  font-size: 16px;
  font-weight: 700;
  text-align: center;
}

#brandText {
  font-size: 10px;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  text-align: center;
  font-weight: 800;
}

.language-picker {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--text-muted);
}

#languageLabel {
  display: none; /* Hide on small screens, select label is implicit */
}

.language-picker select {
  background: #1e293b;
  border: 1px solid var(--glass-border);
  color: var(--text-light);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 12px;
  outline: none;
  cursor: pointer;
}

.language-picker select option {
  background-color: #1e293b;
  color: var(--text-light);
}

/* Gameplay HUD */
.game-hud {
  display: grid;
  grid-template-columns: 1.2fr 0.9fr 0.9fr;
  gap: 10px;
  padding: 10px 16px;
  background: rgba(15, 23, 42, 0.2);
  border-bottom: 1px solid var(--glass-border);
}

.hud-item {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
}

.hud-item span {
  font-size: 11px;
  color: var(--text-muted);
}

.hud-item div {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 3px;
  overflow: hidden;
}

.hud-item i {
  display: block;
  height: 100%;
  background: var(--primary);
  border-radius: 3px;
  width: 0%;
  transition: width 0.3s ease;
}

.hud-item-score, .hud-item-moves {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
}

.hud-item-score span, .hud-item-moves span {
  font-size: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.hud-item-score strong, .hud-item-moves strong {
  font-size: 18px;
  font-weight: 700;
}

/* Stage / Level Selector */
.stage-select {
  flex: 1;
  min-height: 0;
  padding: 24px 16px calc(42px + env(safe-area-inset-bottom));
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stage-select h2 {
  font-size: 20px;
  margin-bottom: 20px;
  font-weight: 700;
  text-align: center;
}

.stage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  width: 100%;
  max-width: 360px;
  padding-bottom: 8px;
}

.stage-card {
  width: 100%;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 14px;
  padding: 16px;
  color: var(--text-light);
  text-align: left;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.stage-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), transparent);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.stage-card.unlocked:active {
  transform: scale(0.97);
}

.stage-card.unlocked:hover::before {
  opacity: 1;
}

.stage-card.locked {
  opacity: 0.4;
  cursor: not-allowed;
}

.stage-card span {
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 4px;
}

.stage-card.locked span {
  color: var(--text-muted);
}

.stage-card strong {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
}

.stage-card small {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
}

.stage-card .stars-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  font-size: 14px;
  letter-spacing: -2px;
}

/* Card Board Panel */
.game-board-panel {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  overflow: hidden;
}

.card-grid {
  display: grid;
  width: 100%;
  max-width: 380px;
  max-height: calc(100vh - 240px);
  gap: 10px;
  justify-content: center;
  align-content: center;
}

/* Card Styling */
.card {
  perspective: 600px;
  cursor: pointer;
  aspect-ratio: 1 / 1;
  position: relative;
  user-select: none;
  width: 100%;
}

.card-inner {
  width: 100%;
  height: 100%;
  transition: transform 0.4s cubic-bezier(0.3, 0.8, 0.4, 1.1);
  transform-style: preserve-3d;
  position: relative;
  border-radius: 12px;
}

.card.flipped .card-inner {
  transform: rotateY(180deg);
}

.card.matched .card-inner {
  transform: rotateY(180deg) scale(0.95);
  pointer-events: none;
}

.card-front, .card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  transition: all 0.2s ease;
}

.card-back {
  background: var(--card-back-bg);
  border: 2px solid rgba(59, 130, 246, 0.35);
  box-shadow: inset 0 0 15px rgba(59, 130, 246, 0.15);
}

.card:active:not(.flipped):not(.matched) .card-back {
  border-color: var(--primary);
  transform: scale(0.95);
}

.card-back svg {
  width: 50%;
  height: 50%;
  stroke: var(--primary);
  filter: drop-shadow(0 0 4px var(--primary-glow));
}

.card-front {
  background: var(--card-front-bg);
  border: 2px solid rgba(255, 255, 255, 0.15);
  transform: rotateY(180deg);
  padding: 8px;
}

.card-front svg {
  width: 80%;
  height: 80%;
}

.card.matched .card-front {
  border-color: var(--success);
  box-shadow: 0 0 12px var(--success-glow);
}

/* Feedback / Footer */
.feedback {
  padding: 14px 16px;
  text-align: center;
  border-top: 1px solid var(--glass-border);
  background: rgba(15, 23, 42, 0.3);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 70px;
}

#feedbackText {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
}

.combo-badge {
  font-size: 11px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--warning), #ea580c);
  color: #fff;
  padding: 2px 8px;
  border-radius: 10px;
  margin-top: 6px;
  box-shadow: 0 2px 6px rgba(245, 158, 11, 0.3);
  animation: popIn 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.28);
}

/* Popups & Overlays */
.result-panel {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--glass-bg);
  backdrop-filter: blur(15px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 100;
  animation: fadeIn 0.3s ease;
}

.result-card {
  background: linear-gradient(135deg, #1e293b, #0f172a);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 24px;
  padding: 30px 24px;
  width: 100%;
  max-width: 340px;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  animation: scaleIn 0.4s cubic-bezier(0.18, 0.89, 0.32, 1.28);
}

.result-card h2 {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 12px;
}

.star-rating {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin: 16px 0;
  font-size: 32px;
}

.star-rating .star {
  opacity: 0.2;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.star-rating .star.active {
  opacity: 1;
  transform: scale(1.2);
  filter: drop-shadow(0 0 8px rgba(245, 158, 11, 0.5));
}

#resultText {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.5;
}

.result-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.result-actions button, .result-actions a {
  width: 100%;
  padding: 12px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
  text-decoration: none;
  display: block;
}

#nextLevelBtn {
  background: var(--success);
  color: #fff;
}

#nextLevelBtn:active {
  transform: scale(0.97);
  background: #059669;
}

#againBtn {
  background: var(--primary);
  color: #fff;
}

#againBtn:active {
  transform: scale(0.97);
  background: #2563eb;
}

#stageSelectBtn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--glass-border);
  color: var(--text-light);
}

#stageSelectBtn:active {
  transform: scale(0.97);
  background: rgba(255, 255, 255, 0.12);
}

.lobby-btn {
  background: transparent;
  color: var(--text-muted);
}

.lobby-btn:active {
  color: var(--text-light);
}

/* Loading Panel */
.loading-panel {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-darker);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 200;
}

.loading-card {
  text-align: center;
  width: 100%;
  max-width: 280px;
}

.loading-card strong {
  display: block;
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

.loading-card span {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.loading-card div {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 4px;
  overflow: hidden;
}

#loadingFill {
  display: block;
  height: 100%;
  background: var(--primary);
  width: 0%;
  border-radius: 4px;
  transition: width 0.1s linear;
}

/* Sound Toggle (dynamically added by sound.js) */
.sound-toggle {
  position: absolute !important;
  top: env(safe-area-inset-top, 0px) !important;
  right: 16px !important;
  margin-top: 12px !important;
  z-index: 10 !important;
  background: rgba(255, 255, 255, 0.05) !important;
  border: 1px solid var(--glass-border) !important;
  color: var(--text-light) !important;
  width: 40px !important;
  height: 40px !important;
  border-radius: 50% !important;
  font-size: 16px !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  cursor: pointer !important;
  outline: none !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2) !important;
}

.sound-toggle:active {
  transform: scale(0.9) !important;
  background: rgba(255, 255, 255, 0.12) !important;
}

/* Helpers */
.hidden {
  display: none !important;
}

/* Keyframe Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scaleIn {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

@keyframes popIn {
  0% { transform: scale(0.5); opacity: 0; }
  70% { transform: scale(1.1); }
  100% { transform: scale(1); opacity: 1; }
}
html,
body,
button,
a,
canvas,
[role="button"] {
  -webkit-user-select: none;
  user-select: none;
}

input,
textarea,
select,
[contenteditable="true"] {
  -webkit-user-select: text;
  user-select: text;
}