/* ================================================================
   MATCHING GAME — Player UI Styles
   Premium dark theme with glassmorphism & micro-animations
   ================================================================ */

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

:root {
  --bg-primary: #0a0a1a;
  --bg-secondary: #12122a;
  --bg-card: rgba(255, 255, 255, 0.05);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --bg-glass: rgba(255, 255, 255, 0.06);
  --border-glass: rgba(255, 255, 255, 0.1);
  --text-primary: #f0f0ff;
  --text-secondary: #8888aa;
  --accent: #7c5cfc;
  --accent-glow: rgba(124, 92, 252, 0.4);
  --accent-light: #a78bfa;
  --success: #34d399;
  --success-glow: rgba(52, 211, 153, 0.4);
  --warning: #fbbf24;
  --card-face: linear-gradient(135deg, #1e1e3a 0%, #2a2a50 100%);
  --card-back: linear-gradient(135deg, #7c5cfc 0%, #a78bfa 50%, #7c5cfc 100%);
  --card-matched: linear-gradient(135deg, #065f46 0%, #047857 100%);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Outfit', system-ui, -apple-system, sans-serif;
}

html {
  font-size: 16px;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Screen Manager ---------- */
.screen {
  display: none;
  min-height: 100dvh;
}
.screen.active {
  display: flex;
  flex-direction: column;
}

/* ---------- Lobby ---------- */
.lobby-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  padding: 2rem;
  position: relative;
  text-align: center;
}

.logo-glow {
  position: absolute;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  border-radius: 50%;
  filter: blur(60px);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -65%);
  pointer-events: none;
  animation: pulse-glow 4s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 0.5; transform: translate(-50%, -65%) scale(1); }
  50% { opacity: 0.8; transform: translate(-50%, -65%) scale(1.1); }
}

.lobby-title {
  font-size: clamp(3rem, 10vw, 5rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-light), var(--accent), #e879f9);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
  z-index: 1;
}

.lobby-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 600;
}

/* Difficulty Selector */
.difficulty-selector {
  margin-top: 2rem;
  text-align: center;
}

/* Player Name Section */
.player-name-section {
  margin-top: 2.5rem;
  display: flex;
  justify-content: center;
}

.player-name-display {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  transition: var(--transition);
}

.player-name-display:hover {
  background: rgba(255, 255, 255, 0.05);
}

.player-name-text {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.player-name-edit-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: 1px solid var(--border-glass);
  border-radius: 50%;
  background: var(--bg-glass);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  flex-shrink: 0;
}

.player-name-edit-btn:hover {
  color: var(--accent-light);
  border-color: var(--accent);
  background: rgba(124, 92, 252, 0.15);
}

.player-name-input-wrap {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-glass);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 0.35rem 0.5rem 0.35rem 1rem;
  box-shadow: 0 0 20px var(--accent-glow);
  animation: fade-in 0.2s ease;
}

.player-name-input-wrap.hidden {
  display: none !important;
}

.player-name-input {
  font-family: var(--font);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  background: transparent;
  border: none;
  outline: none;
  width: 160px;
  caret-color: var(--accent-light);
}

.player-name-input::placeholder {
  color: var(--text-secondary);
  font-weight: 400;
}

.player-name-confirm-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  cursor: pointer;
  transition: var(--transition);
  flex-shrink: 0;
}

.player-name-confirm-btn:hover {
  background: var(--accent-light);
  box-shadow: 0 0 15px var(--accent-glow);
}

.difficulty-label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.difficulty-options {
  display: flex;
  gap: 0.5rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius);
  padding: 0.35rem;
}

.diff-btn {
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 700;
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.diff-btn.active {
  background: var(--accent);
  color: white;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.diff-btn:not(.active):hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

/* Mode Selector */
.mode-selector {
  margin-top: 1.5rem;
  text-align: center;
}

.mode-btn {
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 700;
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.mode-btn.active {
  background: var(--accent);
  color: white;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.mode-btn:not(.active):hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.time-limit-config {
  margin-top: 1rem;
  animation: fade-in 0.3s ease;
}

.time-limit-options {
  display: flex;
  gap: 0.4rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius);
  padding: 0.35rem;
  justify-content: center;
}

.time-btn {
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 0.5rem 0.9rem;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.time-btn.active {
  background: #e74c3c;
  color: white;
  box-shadow: 0 4px 15px rgba(231, 76, 60, 0.35);
}

.time-btn:not(.active):hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.hidden {
  display: none !important;
}

/* Preview Toggle */
.preview-selector {
  margin-top: 1.5rem;
  text-align: center;
}

.preview-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
}

.preview-toggle input[type="checkbox"] {
  display: none;
}

.toggle-switch {
  position: relative;
  width: 48px;
  height: 26px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--border-glass);
  border-radius: 13px;
  transition: var(--transition);
  flex-shrink: 0;
}

.toggle-switch::before {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  background: var(--text-secondary);
  border-radius: 50%;
  transition: var(--transition);
}

.preview-toggle input:checked + .toggle-switch {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 15px var(--accent-glow);
}

.preview-toggle input:checked + .toggle-switch::before {
  transform: translateX(22px);
  background: white;
}

.toggle-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition);
}

.preview-toggle input:checked ~ .toggle-label {
  color: var(--text-primary);
}

/* Preview Duration Config */
.preview-duration-config {
  margin-top: 1rem;
  animation: fade-in 0.3s ease;
}

.preview-duration-options {
  display: flex;
  gap: 0.4rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius);
  padding: 0.35rem;
  justify-content: center;
}

.preview-btn {
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 0.5rem 0.9rem;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.preview-btn.active {
  background: var(--accent);
  color: white;
  box-shadow: 0 4px 15px var(--accent-glow);
}

.preview-btn:not(.active):hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

/* Preview Countdown Overlay */
.preview-countdown {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 90;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(1px);
  pointer-events: none;
}

.preview-countdown.active {
  display: flex;
}

.preview-number {
  font-size: clamp(5rem, 20vw, 10rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-light), #e879f9);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: countdown-pulse 1s ease-in-out;
  text-shadow: none;
  filter: drop-shadow(0 0 30px var(--accent-glow));
}

.preview-hint {
  font-size: 1.1rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.8);
  margin-top: 0.5rem;
  letter-spacing: 0.05em;
}

@keyframes countdown-pulse {
  0% { opacity: 0; transform: scale(1.5); }
  30% { opacity: 1; transform: scale(1); }
  80% { opacity: 1; transform: scale(1); }
  100% { opacity: 0.6; transform: scale(0.95); }
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font);
  font-size: 1.15rem;
  font-weight: 700;
  padding: 1rem 2.5rem;
  border: none;
  border-radius: 60px;
  background: linear-gradient(135deg, var(--accent), #a855f7);
  color: white;
  cursor: pointer;
  margin-top: 2.5rem;
  transition: var(--transition);
  box-shadow: 0 8px 30px var(--accent-glow);
  position: relative;
  overflow: hidden;
}

.btn-primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 40%, rgba(255,255,255,0.2) 50%, transparent 60%);
  transform: translateX(-100%);
  transition: transform 0.6s;
}

.btn-primary:hover::after {
  transform: translateX(100%);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px var(--accent-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.7rem 1.8rem;
  border: 1px solid var(--border-glass);
  border-radius: 60px;
  background: var(--bg-glass);
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
}

/* ---------- Game Screen ---------- */
.game-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-glass);
}

.room-code-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.9rem;
  background: var(--bg-glass);
  border: 1px solid var(--accent);
  border-radius: 60px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-light);
  text-transform: lowercase;
  letter-spacing: 0.05em;
  box-shadow: 0 0 15px var(--accent-glow);
  white-space: nowrap;
}

.room-code-badge:empty {
  display: none;
}

/* Game Player Name (in header) */
.game-player-name {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.9rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: 60px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-primary);
  text-transform: capitalize;
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 150px;
  transition: var(--transition);
}

.game-player-name:empty {
  display: none;
}

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  background: var(--bg-glass);
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition);
  backdrop-filter: blur(10px);
  flex-shrink: 0;
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent);
}

.header-stats {
  display: flex;
  gap: 0.75rem;
  flex: 1;
  justify-content: center;
}

.stat {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 0.5rem 1rem;
  backdrop-filter: blur(10px);
}

.stat-icon {
  font-size: 1rem;
}

.stat-value {
  font-size: 1.1rem;
  font-weight: 700;
  min-width: 2ch;
  text-align: center;
}

.stat-value.danger {
  color: #ef4444;
  -webkit-text-fill-color: #ef4444;
  animation: blink 1s steps(1) infinite;
}

/* Card Grid */
.card-grid {
  display: grid;
  gap: 0.5rem;
  padding: 1rem;
  flex: 1;
  align-content: center;
  justify-content: center;
}

/* Responsive grid columns — fixed-width so gap is always consistent */
.card-grid.cols-3 { grid-template-columns: repeat(3, auto); }
.card-grid.cols-4 { grid-template-columns: repeat(4, auto); }
.card-grid.cols-5 { grid-template-columns: repeat(5, auto); }
.card-grid.cols-6 { grid-template-columns: repeat(6, auto); }

/* Card — sized to fill available space, constrained by viewport height */
.card {
  width: clamp(70px, 26vw, 140px);
  aspect-ratio: 3 / 4;
  max-height: calc((100dvh - 7rem) / var(--grid-rows, 4) - 0.5rem);
  perspective: 800px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}

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

.card-face,
.card-back {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-sm);
  backface-visibility: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(1.5rem, 6vw, 2.5rem);
  border: 1px solid var(--border-glass);
}

.card-back {
  background: var(--card-back);
  background-size: 200% 200%;
  animation: gradient-shift 3s ease infinite;
  box-shadow: 0 4px 15px rgba(124, 92, 252, 0.2);
}

@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.card-back::after {
  content: '?';
  font-size: clamp(1.8rem, 7vw, 3rem);
  font-weight: 800;
  color: rgba(255, 255, 255, 0.5);
}

.card-face {
  background: var(--card-face);
  transform: rotateY(180deg);
}

.card.matched .card-face {
  background: var(--card-matched);
  border-color: var(--success);
  box-shadow: 0 0 20px var(--success-glow);
}

.card.matched {
  animation: match-bounce 0.5s ease;
}

@keyframes match-bounce {
  0%, 100% { transform: scale(1); }
  30% { transform: scale(1.1); }
  60% { transform: scale(0.95); }
}

.card:not(.flipped):not(.matched):active .card-inner {
  transform: scale(0.95);
}

/* Game Footer */
.game-footer {
  display: flex;
  justify-content: center;
  padding: 0.75rem 1rem 1.25rem;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-glass);
}

/* ---------- Game Over Overlay ---------- */
.overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  animation: fade-in 0.3s ease;
}

.overlay.active {
  display: flex;
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

.overlay-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: calc(var(--radius) * 1.5);
  padding: 2.5rem 2rem;
  text-align: center;
  max-width: 360px;
  width: 100%;
  position: relative;
  animation: slide-up 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.5);
}

@keyframes slide-up {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.overlay-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
}

.results {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.result-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
}

.result-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
}

.result-value {
  font-size: 1.6rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-light), var(--success));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.overlay-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: center;
}

.overlay-buttons .btn-primary {
  margin-top: 0;
}

.overlay-buttons .btn-secondary {
  font-size: 0.85rem;
  padding: 0.55rem 1.5rem;
}

.btn-danger {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font);
  font-size: 1.05rem;
  font-weight: 700;
  padding: 0.85rem 2rem;
  border: none;
  border-radius: 60px;
  background: linear-gradient(135deg, #e74c3c, #c0392b);
  color: white;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 6px 24px rgba(231, 76, 60, 0.35);
}

.btn-danger:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(231, 76, 60, 0.45);
}

.abandon-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

/* ---------- Confetti Burst ---------- */
.confetti-burst {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  pointer-events: none;
}

.confetti-burst::before,
.confetti-burst::after {
  content: '';
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 2px;
}

/* ---------- Connection Status ---------- */
.connection-dot {
  position: fixed;
  top: 1rem;
  right: 1rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 8px var(--success-glow);
  z-index: 50;
  transition: var(--transition);
}

.connection-dot.disconnected {
  background: #ef4444;
  box-shadow: 0 0 8px rgba(239, 68, 68, 0.5);
  animation: blink 1s steps(1) infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* ---------- Responsive ---------- */
@media (max-width: 360px) {
  .card-grid { gap: 0.4rem; padding: 0.6rem; }
  .stat { padding: 0.4rem 0.7rem; }
  .game-header { gap: 0.8rem; }
}

@media (min-width: 768px) {
  .card-grid { padding: 1.5rem; }
}