/* Premium styling for Chess Variants App.
   Aesthetics: Modern Dark Mode, Glassmorphism, Neon/Emerald Accents, No Emojis.
   Optimized for iOS (Safari, Chrome) Full Screen Viewport. */

:root {
  /* Premium Light Mode Colors */
  --bg-color: #f5f6fa;
  --bg-gradient: radial-gradient(circle at top, #ffffff, #eef1f6);
  --card-bg: rgba(255, 255, 255, 0.82);
  --card-border: rgba(0, 0, 0, 0.08);
  --text-main: #1f2937;
  --text-muted: #6b7280;
  --accent-neon: #1062fe; /* Premium iOS Blue */
  --accent-purple: #818cf8;
  --shadow-premium: 0 8px 30px rgba(0, 0, 0, 0.04), 0 1px 3px rgba(0, 0, 0, 0.02);
  --panel-shadow: 0 15px 35px rgba(0, 0, 0, 0.06);
  
  /* Buttons */
  --btn-sec-bg: rgba(0, 0, 0, 0.04);
  --btn-sec-border: rgba(0, 0, 0, 0.08);
  
  /* Inputs */
  --input-bg: rgba(255, 255, 255, 0.9);
  --input-border: rgba(0, 0, 0, 0.12);
  
  /* Brand */
  --brand-grad: linear-gradient(135deg, #1f2937, #4b5563);
  
  /* Lobby Rows */
  --row-bg: rgba(0, 0, 0, 0.02);
  --row-border: rgba(0, 0, 0, 0.04);

  /* Default Piece Colors (Classic) */
  --p-white-fill: #ffffff;
  --p-white-stroke: #1e2430;
  --p-white-detail: #8b9bb4;

  --p-black-fill: #2c323f;
  --p-black-stroke: #0a0b0d;
  --p-black-detail: #ffffff;

  --p-red-fill: #e11d48;
  --p-red-stroke: #4c0519;
  --p-red-detail: #ffffff;

  --p-blue-fill: #2563eb;
  --p-blue-stroke: #1e3a8a;
  --p-blue-detail: #ffffff;

  --p-yellow-fill: #d97706;
  --p-yellow-stroke: #451a03;
  --p-yellow-detail: #ffffff;

  --p-green-fill: #16a34a;
  --p-green-stroke: #064e3b;
  --p-green-detail: #ffffff;

  --p-grey-fill: #4b5563;
  --p-grey-stroke: #111827;
  --p-grey-detail: #d1d5db;

  /* Board Themes (Defaults for Emerald-Glass) */
  --sq-selected: rgba(16, 185, 129, 0.35);
  --sq-highlight: rgba(16, 185, 129, 0.2);
  --sq-check: rgba(239, 68, 68, 0.7);
  --sq-last-move: rgba(245, 158, 11, 0.35);
  
  /* Moving chess board background grid color */
  --bg-grid-color: rgba(0, 0, 0, 0.035);
}

/* Dark Mode Override */
body.mode-dark {
  --bg-color: #08090c;
  --bg-gradient: radial-gradient(circle at top, #141824, #08090c);
  --card-bg: rgba(20, 24, 33, 0.65);
  --card-border: rgba(255, 255, 255, 0.08);
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --accent-neon: #00f2fe;
  --accent-purple: #4facfe;
  --shadow-premium: 0 10px 40px rgba(0, 0, 0, 0.5);
  --panel-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
  
  /* Buttons */
  --btn-sec-bg: rgba(255, 255, 255, 0.05);
  --btn-sec-border: rgba(255, 255, 255, 0.08);
  
  /* Inputs */
  --input-bg: rgba(0, 0, 0, 0.2);
  --input-border: rgba(255, 255, 255, 0.08);
  
  /* Brand */
  --brand-grad: linear-gradient(135deg, #ffffff, #8b9bb4);
  
  /* Lobby Rows */
  --row-bg: rgba(255, 255, 255, 0.02);
  --row-border: rgba(255, 255, 255, 0.04);

  /* Piece Colors (Classic) */
  --p-black-fill: #252a37;
  --p-black-stroke: #0b0c10;
  --p-black-detail: #d2d8e6;

  /* Board Themes (Defaults for Emerald-Glass) */
  --sq-selected: rgba(0, 242, 254, 0.45);
  --sq-highlight: rgba(0, 242, 254, 0.25);
  --sq-check: rgba(255, 59, 48, 0.7);
  --sq-last-move: rgba(255, 204, 0, 0.3);
  
  /* Moving chess board background grid color */
  --bg-grid-color: rgba(255, 255, 255, 0.025);
}

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

body {
  font-family: 'Outfit', sans-serif;
  background-color: var(--bg-color);
  background-image: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-main);
  min-height: 100vh;
  min-height: -webkit-fill-available;
  overflow-x: hidden;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  z-index: -1;
  background-image: 
    linear-gradient(45deg, var(--bg-grid-color) 25%, transparent 25%, transparent 75%, var(--bg-grid-color) 75%, var(--bg-grid-color)),
    linear-gradient(45deg, var(--bg-grid-color) 25%, transparent 25%, transparent 75%, var(--bg-grid-color) 75%, var(--bg-grid-color));
  background-size: 80px 80px;
  background-position: 0 0, 40px 40px;
  animation: move-bg 35s linear infinite;
  pointer-events: none;
}

@keyframes move-bg {
  0% {
    transform: translate(0, 0) rotate(0deg);
  }
  100% {
    transform: translate(80px, 80px) rotate(0deg);
  }
}

body.game-active {
  overflow: hidden;
  height: 100vh;
  height: -webkit-fill-available;
}

html {
  height: -webkit-fill-available;
}

#app {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
}

/* Loader Screen */
.initial-loader {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  gap: 20px;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 3px solid rgba(255, 255, 255, 0.05);
  border-radius: 50%;
  border-top-color: var(--accent-neon);
  animation: spin 1s linear infinite;
}

.loader-text {
  font-size: 1.1rem;
  color: var(--text-muted);
  font-weight: 300;
  letter-spacing: 0.1rem;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Toast System */
.toast-container {
  position: fixed;
  top: calc(20px + env(safe-area-inset-top));
  left: 50%;
  transform: translateX(-50%) translateY(-100px);
  z-index: 9999;
  background: rgba(13, 17, 28, 0.9);
  border: 1px solid var(--accent-neon);
  padding: 12px 24px;
  border-radius: 30px;
  font-size: 0.95rem;
  font-weight: 600;
  box-shadow: 0 10px 30px rgba(0, 242, 254, 0.15);
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  pointer-events: none;
  text-align: center;
  max-width: 90%;
  color: #fff;
}

.toast-container.show {
  transform: translateX(-50%) translateY(0);
}

/* Premium Button Styling */
.btn-premium {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  gap: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: inherit;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-neon));
  color: #000;
  box-shadow: 0 4px 15px rgba(0, 242, 254, 0.25);
  font-weight: 800;
}

.btn-primary:active {
  transform: scale(0.97);
  box-shadow: 0 2px 5px rgba(0, 242, 254, 0.1);
}

.btn-secondary {
  background: var(--btn-sec-bg);
  border-color: var(--btn-sec-border);
  color: var(--text-main);
}

.btn-secondary:active {
  background: var(--btn-sec-bg);
  opacity: 0.8;
  transform: scale(0.97);
}

/* Glass Card containers */
.glass-panel {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: 20px;
  box-shadow: var(--panel-shadow);
}

/* ──────────────────────────────────────────────────────────────────────────
   1. HOME SCREEN / LOBBY BROWSER
   ────────────────────────────────────────────────────────────────────────── */

.home-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 24px;
  padding-top: calc(60px + env(safe-area-inset-top));
  padding-bottom: calc(32px + env(safe-area-inset-bottom));
  min-height: 100vh;
  min-height: -webkit-fill-available;
  gap: 24px;
  width: 100%;
}

.brand-section {
  text-align: center;
  margin-bottom: 8px;
}

.brand-section h1 {
  font-size: 2.8rem;
  font-weight: 800;
  background: var(--brand-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.03em;
  margin-bottom: 4px;
}

/* Settings cog button */
.btn-settings-icon {
  position: absolute;
  top: calc(16px + env(safe-area-inset-top));
  right: 16px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  color: var(--text-main);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-premium);
  z-index: 999;
  transition: all 0.2s ease;
}

.btn-settings-icon:active {
  transform: scale(0.92);
  background: var(--btn-sec-bg);
}

.lobby-player-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--row-bg);
  border: 1px solid var(--row-border);
}

.brand-section p {
  color: var(--text-muted);
  font-size: 1rem;
  font-weight: 300;
  letter-spacing: 0.05em;
}

.variant-selector {
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.variant-card {
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.variant-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: transparent;
  transition: background 0.25s ease;
}

.variant-card.selected {
  border-color: rgba(0, 242, 254, 0.3);
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.1);
  background: rgba(0, 242, 254, 0.04);
}

.variant-card.selected::before {
  background: linear-gradient(to bottom, var(--accent-purple), var(--accent-neon));
}

.variant-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.variant-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-main);
}

.variant-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.35;
}

.action-buttons {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 420px;
  gap: 12px;
}

.lobby-browser-btn {
  border-color: rgba(0, 242, 254, 0.2);
  color: var(--accent-neon);
}

/* Public Lobby Browser Overlay */
.lobby-browser-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(4, 5, 8, 0.9);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  animation: fadeIn 0.25s ease;
}

.lobby-browser-content {
  width: 100%;
  max-width: 500px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  padding: 24px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.modal-title {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.modal-close-btn {
  background: none;
  border: none;
  cursor: pointer;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
}

.modal-close-svg {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: var(--text-muted);
  stroke-width: 2.5;
  stroke-linecap: round;
}

.lobby-list {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-right: 4px;
}

.lobby-item {
  padding: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.lobby-details {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.lobby-host {
  font-weight: 600;
  font-size: 0.95rem;
}

.lobby-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.lobby-actions {
  display: flex;
  gap: 8px;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.8rem;
  border-radius: 8px;
}

.lobby-empty {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 300;
}

/* ──────────────────────────────────────────────────────────────────────────
   2. LOBBY SCREEN (Setup timers, teams, player list, spectator list)
   ────────────────────────────────────────────────────────────────────────── */

.lobby-container {
  display: flex;
  flex-direction: column;
  padding: 24px;
  padding-top: calc(40px + env(safe-area-inset-top));
  padding-bottom: calc(32px + env(safe-area-inset-bottom));
  min-height: 100vh;
  min-height: -webkit-fill-available;
  gap: 20px;
  width: 100%;
}

.lobby-headline {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.lobby-code-box {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.lobby-code-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.lobby-code-value {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent-neon);
  letter-spacing: 0.05em;
  line-height: 1;
}

.lobby-panels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  flex: 1;
}

@media (min-width: 768px) or (orientation: landscape) {
  .lobby-panels {
    grid-template-columns: 1.2fr 1fr;
  }
}

.panel-header {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.lobby-players-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.lobby-player-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.02);
}

.player-identity {
  display: flex;
  align-items: center;
  gap: 10px;
}

.player-index-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.player-index-white { background-color: #ffffff; border: 1px solid #666; }
.player-index-black { background-color: #2c2c35; border: 1px solid #fff; }
.player-index-0 { background-color: #ffffff; border: 1px solid #666; }
.player-index-1 { background-color: #2c2c35; border: 1px solid #fff; }
.player-index-red { background-color: var(--p-red-fill); }
.player-index-blue { background-color: var(--p-blue-fill); }
.player-index-yellow { background-color: var(--p-yellow-fill); }
.player-index-green { background-color: var(--p-green-fill); }

.player-role-badge {
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
  text-transform: uppercase;
}

.role-player {
  background: rgba(0, 242, 254, 0.15);
  color: var(--accent-neon);
}

.role-spectator {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
}

/* Settings configuration */
.lobby-settings-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.settings-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.settings-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.select-premium {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-main);
  padding: 12px;
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.95rem;
  cursor: pointer;
  outline: none;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.select-premium:focus {
  border-color: var(--accent-neon);
}

.custom-time-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.input-premium {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-main);
  padding: 12px;
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.95rem;
  outline: none;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.input-premium:focus {
  border-color: var(--accent-neon);
}

.lobby-actions-footer {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: auto;
}

/* ──────────────────────────────────────────────────────────────────────────
   3. GAME BOARD SCREEN (Unified layout, swappable Bughouse, 4-Player board)
   ────────────────────────────────────────────────────────────────────────── */

.game-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  padding-top: calc(10px + env(safe-area-inset-top));
  padding-bottom: calc(10px + env(safe-area-inset-bottom));
  overflow: hidden;
  position: relative;
}

.game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 16px 10px 16px;
  height: 48px;
}

.game-title-info {
  display: flex;
  flex-direction: column;
}

.game-variant-badge {
  font-size: 0.75rem;
  color: var(--accent-neon);
  text-transform: uppercase;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.game-status-label {
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--text-main);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 2px;
}

.game-status-label::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--text-muted);
}

.game-status-label.my-turn {
  color: var(--accent-neon);
}

.game-status-label.my-turn::before {
  background-color: var(--accent-neon);
  box-shadow: 0 0 8px var(--accent-neon);
  animation: pulse-turn-dot 1s infinite alternate;
}

@keyframes pulse-turn-dot {
  from { opacity: 0.5; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1.2); }
}

.game-actions-header {
  display: flex;
  gap: 8px;
}

.game-workspace {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 10px;
  position: relative;
}

.turn-banner {
  position: absolute;
  top: 10px;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-neon));
  color: #000;
  font-weight: 800;
  text-transform: uppercase;
  padding: 6px 18px;
  border-radius: 20px;
  font-size: 0.85rem;
  box-shadow: 0 4px 15px rgba(0, 242, 254, 0.3);
  z-index: 10;
  letter-spacing: 0.05em;
  pointer-events: none;
  animation: pulse-turn 1.5s infinite alternate;
}

@keyframes pulse-turn {
  from { transform: scale(1); opacity: 0.9; }
  to { transform: scale(1.05); opacity: 1; }
}

.player-tag {
  width: 100%;
  max-width: 440px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.02);
  border-radius: 8px;
  font-size: 0.9rem;
  margin-bottom: 6px;
  border: 1px solid rgba(255, 255, 255, 0.03);
}

.player-tag.active {
  background: rgba(0, 242, 254, 0.05);
  border-color: rgba(0, 242, 254, 0.15);
}

.player-info {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

.player-timer {
  font-family: monospace;
  font-size: 1rem;
  font-weight: 800;
  background: rgba(0, 0, 0, 0.2);
  padding: 4px 10px;
  border-radius: 6px;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.player-timer.low-time {
  color: #ff3b30;
  animation: blink-time 0.8s infinite;
}

@keyframes blink-time {
  50% { opacity: 0.4; }
}

/* ──────────────────────────────────────────────────────────────────────────
   4. CHESSBOARDS AND PIECES
   ────────────────────────────────────────────────────────────────────────── */

.board-wrapper {
  position: relative;
  width: 100%;
  max-width: min(90vw, 52vh, 440px);
  aspect-ratio: 1 / 1;
  background-color: var(--board-border);
  padding: 4px;
  border-radius: 12px;
  box-shadow: var(--shadow-premium);
  overflow: hidden;
  margin: 6px 0;
}

.board-wrapper.board-4player {
  max-width: min(90vw, 52vh, 440px);
}

.board-grid-8x8 {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  width: 100%;
  height: 100%;
  border-radius: 8px;
  overflow: hidden;
}

.board-grid-14x14 {
  display: grid;
  grid-template-columns: repeat(14, 1fr);
  grid-template-rows: repeat(14, 1fr);
  width: 100%;
  height: 100%;
  border-radius: 8px;
  overflow: hidden;
}

.square-cell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.15s ease;
  aspect-ratio: 1 / 1;
}

.square-cell.light {
  background-color: var(--sq-light);
}

.square-cell.dark {
  background-color: var(--sq-dark);
}

.square-cell.out-of-bounds {
  visibility: hidden;
  pointer-events: none;
}

.square-cell.selected-sq {
  background-color: var(--sq-selected) !important;
}

.square-cell.last-move-sq::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--sq-last-move);
  pointer-events: none;
}

.square-cell.check-sq {
  background-color: var(--sq-check) !important;
  animation: pulse-check 0.8s infinite alternate;
}

@keyframes pulse-check {
  from { box-shadow: inset 0 0 10px #ff3b30; }
  to { box-shadow: inset 0 0 25px #ff3b30; }
}

.move-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--sq-highlight);
  pointer-events: none;
  z-index: 2;
  box-shadow: 0 0 8px rgba(0, 242, 254, 0.4);
}

.capture-ring {
  width: 82%;
  height: 82%;
  border-radius: 50%;
  border: 3.5px solid var(--sq-highlight);
  position: absolute;
  pointer-events: none;
  z-index: 2;
  box-shadow: inset 0 0 8px rgba(0, 242, 254, 0.4), 0 0 8px rgba(0, 242, 254, 0.4);
}

/* Custom Pieces Rendering with theme support */
.piece {
  width: 90%;
  height: 90%;
  z-index: 5;
  transition: transform 0.25s cubic-bezier(0.25, 1, 0.5, 1);
  filter: drop-shadow(0 3px 6px rgba(0, 0, 0, 0.3));
}

.piece:active {
  transform: scale(1.12);
}

/* Color classes injecting fills & strokes */
.piece.color-white {
  --piece-fill: var(--p-white-fill);
  --piece-stroke: var(--p-white-stroke);
  --piece-detail: var(--p-white-detail);
}

.piece.color-black {
  --piece-fill: var(--p-black-fill);
  --piece-stroke: var(--p-black-stroke);
  --piece-detail: var(--p-black-detail);
}

.piece.color-red {
  --piece-fill: var(--p-red-fill);
  --piece-stroke: var(--p-red-stroke);
  --piece-detail: var(--p-red-detail);
}

.piece.color-blue {
  --piece-fill: var(--p-blue-fill);
  --piece-stroke: var(--p-blue-stroke);
  --piece-detail: var(--p-blue-detail);
}

.piece.color-yellow {
  --piece-fill: var(--p-yellow-fill);
  --piece-stroke: var(--p-yellow-stroke);
  --piece-detail: var(--p-yellow-detail);
}

.piece.color-green {
  --piece-fill: var(--p-green-fill);
  --piece-stroke: var(--p-green-stroke);
  --piece-detail: var(--p-green-detail);
}

.piece.color-grey {
  --piece-fill: var(--p-grey-fill);
  --piece-stroke: var(--p-grey-stroke);
  --piece-detail: var(--p-grey-detail);
  opacity: 0.65;
}

/* ──────────────────────────────────────────────────────────────────────────
   5. BUGHOUSE SPLIT-VIEW AND RESERVES
   ────────────────────────────────────────────────────────────────────────── */

.bughouse-container {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 440px;
  position: relative;
  align-items: center;
}

.partner-board-preview {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 100px;
  height: 100px;
  background-color: var(--board-border);
  padding: 2px;
  border-radius: 8px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.4);
  cursor: pointer;
  z-index: 100;
  overflow: hidden;
  border: 2px solid var(--card-border);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.partner-board-preview:active {
  transform: scale(0.95);
  border-color: var(--accent-neon);
}

.partner-board-preview .square-cell {
  pointer-events: none;
}

.partner-board-preview .piece {
  width: 85%;
  height: 85%;
  filter: none;
}

.reserve-bar {
  display: flex;
  width: 100%;
  max-width: 440px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: 8px;
  padding: 6px 12px;
  gap: 12px;
  margin: 6px 0;
  overflow-x: auto;
  align-items: center;
}

.reserve-item {
  position: relative;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.03);
  transition: all 0.15s ease;
}

.reserve-item.selected {
  border-color: var(--accent-neon);
  background: rgba(0, 242, 254, 0.1);
  box-shadow: 0 0 10px rgba(0, 242, 254, 0.2);
}

.reserve-item .piece {
  width: 80%;
  height: 80%;
}

.reserve-count {
  position: absolute;
  bottom: -2px;
  right: -2px;
  background: var(--accent-neon);
  color: #000;
  font-size: 0.65rem;
  font-weight: 800;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 5px rgba(0,0,0,0.3);
}

/* ──────────────────────────────────────────────────────────────────────────
   6. CUSTOMIZATION PANEL (Board / Piece Theme configuration)
   ────────────────────────────────────────────────────────────────────────── */

.customizer-drawer {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: var(--card-bg);
  border-top: 1px solid var(--card-border);
  border-top-left-radius: 24px;
  border-top-right-radius: 24px;
  backdrop-filter: blur(25px);
  -webkit-backdrop-filter: blur(25px);
  z-index: 1005;
  padding: 24px;
  padding-bottom: calc(24px + env(safe-area-inset-bottom));
  transform: translateY(100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.1);
}

.customizer-drawer.show {
  transform: translateY(0);
}

.customizer-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  z-index: 1004;
  display: none;
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}

.customizer-backdrop.show {
  display: block;
}

.theme-options-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.theme-option-btn {
  padding: 12px;
  border-radius: 10px;
  background: var(--btn-sec-bg);
  border: 1px solid var(--btn-sec-border);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.85rem;
  text-align: center;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  transition: all 0.2s ease;
}

.theme-option-btn.selected {
  border-color: var(--accent-neon);
  color: var(--accent-neon);
  background: rgba(16, 98, 254, 0.08);
}

body.mode-dark .theme-option-btn.selected {
  background: rgba(0, 242, 254, 0.08);
}

/* Board Themes */
/* EMERALD (Default) */
body.theme-emerald {
  --sq-light: #f1f5f9;
  --sq-dark: #10b981;
  --board-border: #1e293b;
}
body.mode-dark.theme-emerald {
  --sq-light: #eceff4;
  --sq-dark: #0d7b70;
  --board-border: #131b26;
}

/* WOOD */
body.theme-wood {
  --sq-light: #f0d9b5;
  --sq-dark: #b58863;
  --board-border: #855833;
}

/* SLATE */
body.theme-slate {
  --sq-light: #e2e8f0;
  --sq-dark: #64748b;
  --board-border: #334155;
}

/* COSMIC-NEON */
body.theme-neon {
  --sq-light: #1e1e2d;
  --sq-dark: #0d0e14;
  --board-border: #1a1b26;
  --sq-last-move: rgba(255, 0, 127, 0.2);
}
body.theme-neon .square-cell.light,
body.theme-neon .preview-cell.light {
  box-shadow: inset 0 0 1px rgba(0, 242, 254, 0.15);
}
body.theme-neon .square-cell.dark,
body.theme-neon .preview-cell.dark {
  box-shadow: inset 0 0 1px rgba(79, 172, 254, 0.15);
}

/* MARBLE (Gilded Marble) */
body.theme-marble {
  --sq-light: #f5f5f7;
  --sq-dark: #1f2024;
  --board-border: #0e0e10;
  --sq-last-move: rgba(212, 175, 55, 0.25);
}
body.theme-marble .square-cell.light,
body.theme-marble .preview-cell.light {
  background-image: radial-gradient(circle at 30% 20%, rgba(212, 175, 55, 0.05) 0%, transparent 60%),
                    linear-gradient(135deg, rgba(212, 175, 55, 0.03) 12%, transparent 12.5%, transparent 87%, rgba(212, 175, 55, 0.03) 87.5%),
                    linear-gradient(45deg, rgba(212, 175, 55, 0.03) 12%, transparent 12.5%, transparent 87%, rgba(212, 175, 55, 0.03) 87.5%);
  box-shadow: inset 0 0 4px rgba(212, 175, 55, 0.15);
}
body.theme-marble .square-cell.dark,
body.theme-marble .preview-cell.dark {
  background-image: radial-gradient(circle at 70% 80%, rgba(212, 175, 55, 0.08) 0%, transparent 50%),
                    linear-gradient(135deg, rgba(212, 175, 55, 0.05) 25%, transparent 25.5%, transparent 74%, rgba(212, 175, 55, 0.05) 74.5%);
  box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.8), inset 0 0 2px rgba(212, 175, 55, 0.2);
}

/* ROYAL (Royal Velvet) */
body.theme-royal {
  --sq-light: #fffcf0;
  --sq-dark: #3b1e54;
  --board-border: #210936;
  --sq-last-move: rgba(255, 215, 0, 0.3);
}
body.theme-royal .square-cell.light,
body.theme-royal .preview-cell.light {
  box-shadow: inset 0 0 3px rgba(255, 215, 0, 0.2);
}
body.theme-royal .square-cell.dark,
body.theme-royal .preview-cell.dark {
  background-image: radial-gradient(circle at center, #4c256c 0%, #311449 100%);
  box-shadow: inset 0 0 6px rgba(255, 215, 0, 0.15);
}

/* Piece Themes */
/* Cyber Theme (Neon Outlines + Gradient Fills) */
.pieces-cyber .piece {
  filter: drop-shadow(0 0 5px var(--piece-fill));
}
.pieces-cyber .piece.color-white {
  --piece-fill: url(#cyan-glow);
  --piece-stroke: #032152;
  --piece-detail: #ffffff;
}
.pieces-cyber .piece.color-black {
  --piece-fill: url(#pink-glow);
  --piece-stroke: #4a0515;
  --piece-detail: #ffffff;
}
.pieces-cyber .piece.color-red {
  --piece-fill: #ff003c;
  --piece-stroke: #5e0c07;
  --piece-detail: #ffffff;
  filter: drop-shadow(0 0 5px #ff003c);
}
.pieces-cyber .piece.color-blue {
  --piece-fill: #00d2ff;
  --piece-stroke: #032152;
  --piece-detail: #ffffff;
  filter: drop-shadow(0 0 5px #00d2ff);
}
.pieces-cyber .piece.color-yellow {
  --piece-fill: #ffea00;
  --piece-stroke: #544402;
  --piece-detail: #18191d;
  filter: drop-shadow(0 0 5px #ffea00);
}
.pieces-cyber .piece.color-green {
  --piece-fill: #00ff66;
  --piece-stroke: #084717;
  --piece-detail: #ffffff;
  filter: drop-shadow(0 0 5px #00ff66);
}

/* Metallic Theme (Gold vs Silver Gradients) */
.pieces-metallic .piece {
  filter: drop-shadow(0 3px 6px rgba(0,0,0,0.4));
}
.pieces-metallic .piece.color-white {
  --piece-fill: url(#silver-grad);
  --piece-stroke: #1e293b;
  --piece-detail: #f8fafc;
}
.pieces-metallic .piece.color-black {
  --piece-fill: url(#gold-grad);
  --piece-stroke: #4a3b00;
  --piece-detail: #fffbeb;
}
.pieces-metallic .piece.color-red {
  --piece-fill: url(#ruby-grad);
  --piece-stroke: #4c0000;
  --piece-detail: #ffccd5;
}
.pieces-metallic .piece.color-blue {
  --piece-fill: url(#sapphire-grad);
  --piece-stroke: #03153c;
  --piece-detail: #dbeafe;
}
.pieces-metallic .piece.color-yellow {
  --piece-fill: url(#gold-grad);
  --piece-stroke: #4a3b00;
  --piece-detail: #fffbeb;
}
.pieces-metallic .piece.color-green {
  --piece-fill: url(#emerald-grad);
  --piece-stroke: #022010;
  --piece-detail: #dcfce7;
}

/* Neo Theme (Clean geometric layout) */
.pieces-neo .piece {
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.22));
}

/* Alpha Theme (Staunton publishing layout) */
.pieces-alpha .piece {
  filter: drop-shadow(0 3px 6px rgba(0, 0, 0, 0.28));
  --alpha-fill: var(--piece-fill);
  --alpha-stroke: var(--piece-stroke);
}
.pieces-alpha .piece.color-black {
  --alpha-fill: var(--p-black-fill);
  --alpha-stroke: var(--p-black-detail);
}

/* ──────────────────────────────────────────────────────────────────────────
   7. CHAT & SPECTATORS LAYOUT
   ────────────────────────────────────────────────────────────────────────── */

.spectators-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 10px;
}

.spectator-icon-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-neon);
  animation: pulse-dot 1.5s infinite;
}

@keyframes pulse-dot {
  50% { opacity: 0.3; }
}

.fade-in {
  animation: fadeIn 0.25s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.98); }
  to { opacity: 1; transform: scale(1); }
}

/* Co-play move suggestions pulsing dashed borders */
.square-cell.suggested-from::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  right: 3px;
  bottom: 3px;
  border: 3px dashed var(--accent-neon);
  border-radius: 8px;
  pointer-events: none;
  z-index: 12;
  animation: pulse-suggestion 1s infinite alternate;
}

.square-cell.suggested-to::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  right: 3px;
  bottom: 3px;
  border: 3px dashed var(--accent-purple);
  border-radius: 8px;
  pointer-events: none;
  z-index: 12;
  animation: pulse-suggestion 1s infinite alternate;
}

@keyframes pulse-suggestion {
  from { opacity: 0.4; transform: scale(0.97); }
  to { opacity: 1; transform: scale(1.02); }
}

/* Theme Preview inside Settings Drawer */
.theme-preview-box {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 20px;
  padding: 12px;
  background: rgba(0, 0, 0, 0.02);
  border: 1px dashed var(--card-border);
  border-radius: 12px;
}

body.mode-dark .theme-preview-box {
  background: rgba(255, 255, 255, 0.02);
}

.mini-preview-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  width: 130px;
  height: 130px;
  border: 5px solid var(--board-border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-premium);
  background-color: var(--board-border);
}

.preview-cell {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  aspect-ratio: 1 / 1;
}

.preview-cell.light {
  background-color: var(--sq-light);
}

.preview-cell.dark {
  background-color: var(--sq-dark);
}

.preview-cell svg {
  width: 76%;
  height: 76%;
  display: block;
}

/* ──────────────────────────────────────────────────────────────────────────
   8. RESPONSIVE LANDSCAPE ORIENTATION OVERRIDES
   ────────────────────────────────────────────────────────────────────────── */
@media (orientation: landscape) {
  /* Home Screen Overrides */
  .home-container {
    padding-top: calc(20px + env(safe-area-inset-top));
    padding-bottom: calc(16px + env(safe-area-inset-bottom));
    gap: 16px;
    justify-content: center;
  }

  .brand-section {
    margin-bottom: 0;
  }

  .brand-section h1 {
    font-size: 2.2rem;
  }

  .brand-section p {
    font-size: 0.8rem;
  }

  .variant-selector {
    max-width: 860px;
    flex-direction: row;
    gap: 12px;
  }

  .variant-card {
    flex: 1;
    min-width: 200px;
    padding: 12px 16px;
    gap: 4px;
  }

  .variant-title {
    font-size: 1rem;
  }

  .variant-desc {
    font-size: 0.75rem;
    line-height: 1.25;
  }

  /* Lobby Screen Overrides */
  .lobby-container {
    padding: 16px 24px;
    padding-top: calc(16px + env(safe-area-inset-top));
    padding-bottom: calc(16px + env(safe-area-inset-bottom));
  }

  .lobby-headline {
    margin-bottom: 12px;
  }

  /* Game Screen Overrides */
  .game-container {
    padding-top: calc(4px + env(safe-area-inset-top));
    padding-bottom: calc(4px + env(safe-area-inset-bottom));
  }

  .game-workspace {
    display: grid;
    grid-template-columns: auto minmax(260px, 320px);
    grid-auto-rows: min-content;
    column-gap: 24px;
    row-gap: 8px;
    align-content: center;
    justify-content: center;
    padding: 6px 24px;
    height: calc(100vh - 48px - env(safe-area-inset-top) - env(safe-area-inset-bottom));
    box-sizing: border-box;
    overflow-y: hidden;
  }

  .board-wrapper {
    grid-column: 1;
    grid-row: 1 / span 12;
    align-self: center;
    justify-self: center;
    max-width: min(85vw, 75vh, 440px) !important;
    margin: 0 !important;
  }

  /* Sidebar items in game workspace */
  .game-workspace > :not(.board-wrapper):not(.partner-board-preview) {
    grid-column: 2;
  }

  .player-tag {
    max-width: 100% !important;
    margin: 0 !important;
    padding: 6px 10px !important;
  }

  .player-info {
    font-size: 0.85rem !important;
  }

  .player-timer {
    font-size: 0.9rem !important;
    padding: 3px 8px !important;
  }

  .reserve-bar {
    max-width: 100% !important;
    margin: 0 !important;
    padding: 4px 10px !important;
    gap: 8px !important;
  }

  .partner-board-preview {
    grid-column: 2;
    position: static;
    width: 80px;
    height: 80px;
    margin: 4px auto !important;
    box-shadow: var(--shadow-premium);
  }
}

/* ──────────────────────────────────────────────────────────────────────────
   9. HOLO SPRITE SHEET THEME (Gemini-Generated Icons)
   ────────────────────────────────────────────────────────────────────────── */
.piece-sprite {
  width: 90%;
  height: 90%;
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
  display: block;
  z-index: 5;
  transition: transform 0.25s cubic-bezier(0.25, 1, 0.5, 1);
  mix-blend-mode: screen; /* Dynamically extracts transparent shapes from solid black bg */
}

/* Make active scale effects match SVG pieces */
.piece-sprite:active {
  transform: scale(1.12);
}

/* Align theme preview display sizing */
.preview-cell .piece-sprite {
  width: 76%;
  height: 76%;
}

/* Colorshift CSS filters for each player color (Base is Cyan) */
.piece-sprite.color-white {
  filter: saturate(0) brightness(1.7) contrast(1.1); /* Desaturate to pure glowing white icon */
}

.piece-sprite.color-black {
  filter: hue-rotate(185deg) saturate(1.8) brightness(1.25); /* Gorgeous glowing magenta/pink icon */
}

.piece-sprite.color-red {
  filter: hue-rotate(145deg) saturate(2.2) brightness(1.1); /* Glowing neon red icon */
}

.piece-sprite.color-blue {
  filter: hue-rotate(0deg) saturate(1.6) brightness(1.1); /* Neon cyan/blue icon */
}

.piece-sprite.color-yellow {
  filter: hue-rotate(225deg) saturate(2.4) brightness(1.15); /* Glowing neon gold/yellow icon */
}

.piece-sprite.color-green {
  filter: hue-rotate(75deg) saturate(2.2) brightness(1.15); /* Glowing emerald green icon */
}