/* ===================================================================
   XO ARENA - CYBER ESPORTS DESIGN SYSTEM
   Modern Dark Glassmorphism, Neon Highlights, Micro-animations
   =================================================================== */

:root {
  --bg-primary: #080c16;
  --bg-secondary: #0f172a;
  --bg-card: rgba(16, 24, 43, 0.75);
  --bg-card-hover: rgba(22, 34, 60, 0.85);
  --bg-overlay: rgba(5, 8, 15, 0.85);

  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.2);
  --border-glow: rgba(0, 242, 254, 0.35);

  /* Neon Brand Colors */
  --neon-cyan: #00f2fe;
  --neon-cyan-dark: #00b4d8;
  --neon-pink: #f72585;
  --neon-pink-dark: #b5179e;
  --neon-gold: #ffd166;
  --neon-green: #06d6a0;
  --neon-purple: #7209b7;
  --neon-red: #ef476f;

  /* Typography */
  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Shadows */
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.6);
  --shadow-cyan: 0 0 24px rgba(0, 242, 254, 0.35);
  --shadow-pink: 0 0 24px rgba(247, 37, 133, 0.35);
  --shadow-gold: 0 0 24px rgba(255, 209, 102, 0.45);

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: #f1f5f9;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Ambient Background Glows */
body::before, body::after {
  content: '';
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(120px);
  opacity: 0.22;
  z-index: 0;
}

body::before {
  top: -10vw;
  left: -10vw;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, var(--neon-cyan), transparent 70%);
}

body::after {
  bottom: -15vw;
  right: -10vw;
  width: 55vw;
  height: 55vw;
  background: radial-gradient(circle, var(--neon-pink), transparent 70%);
}

/* App Container */
.app-container {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.25rem 2rem;
}

/* ===================================================================
   TOP NAVBAR
   =================================================================== */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2rem;
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 12, 22, 0.7);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  text-decoration: none;
  user-select: none;
}

.brand-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.2), rgba(247, 37, 133, 0.2));
  border: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.25rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.brand-icon::after {
  content: '';
  position: absolute;
  inset: -50%;
  background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  animation: shine 4s infinite linear;
}

@keyframes shine {
  0% { transform: translateX(-100%) rotate(45deg); }
  50%, 100% { transform: translateX(100%) rotate(45deg); }
}

.brand-icon .x-mark {
  color: var(--neon-cyan);
  text-shadow: 0 0 10px var(--neon-cyan);
}

.brand-icon .o-mark {
  color: var(--neon-pink);
  text-shadow: 0 0 10px var(--neon-pink);
  margin-left: -2px;
}

.brand-text {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(90deg, #ffffff, #cbd5e1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.brand-tag {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  background: linear-gradient(90deg, var(--neon-cyan), var(--neon-pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  padding: 0.15rem 0.45rem;
  border-radius: 6px;
  border: 1px solid rgba(0, 242, 254, 0.3);
}

/* Nav Stats / Online Badge */
.nav-center {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.online-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.85rem;
  border-radius: 9999px;
  background: rgba(6, 214, 160, 0.1);
  border: 1px solid rgba(6, 214, 160, 0.25);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--neon-green);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--neon-green);
  box-shadow: 0 0 8px var(--neon-green);
  animation: pulse 2s infinite ease-in-out;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

/* Nav Actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.user-chip {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.35rem 0.85rem 0.35rem 0.45rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.user-chip:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

.user-chip-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.user-chip-info {
  display: flex;
  flex-direction: column;
}

.user-chip-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
}

.user-chip-record {
  font-size: 0.7rem;
  color: #94a3b8;
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: #94a3b8;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  font-size: 1.15rem;
}

.icon-btn:hover {
  color: #fff;
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

.icon-btn.active {
  color: var(--neon-cyan);
  border-color: var(--neon-cyan);
  box-shadow: 0 0 12px rgba(0, 242, 254, 0.25);
}

/* ===================================================================
   LOBBY VIEW
   =================================================================== */
.lobby-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 1.75rem;
}

@media (max-width: 980px) {
  .lobby-grid {
    grid-template-columns: 1fr;
  }
}

/* Hero / Announcement Card */
.hero-card {
  background: linear-gradient(135deg, rgba(22, 34, 60, 0.9), rgba(14, 20, 36, 0.95));
  border: 1px solid rgba(0, 242, 254, 0.2);
  border-radius: 20px;
  padding: 1.75rem 2rem;
  margin-bottom: 1.75rem;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.hero-card::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 250px;
  height: 250px;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.15), transparent 70%);
  pointer-events: none;
}

.hero-title {
  font-family: var(--font-display);
  font-size: 1.65rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.hero-title span {
  background: linear-gradient(90deg, var(--neon-cyan), #fff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  color: #94a3b8;
  font-size: 0.95rem;
  max-width: 600px;
}

/* Mode Selection Cards */
.section-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: #e2e8f0;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.modes-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-bottom: 2rem;
}

@media (max-width: 768px) {
  .modes-container {
    grid-template-columns: 1fr;
  }
}

.mode-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  padding: 1.5rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.mode-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 18px;
  padding: 1px;
  background: linear-gradient(135deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.mode-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--neon-cyan);
  transform: translateY(-4px);
  box-shadow: var(--shadow-cyan);
}

.mode-card.active {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.25);
  background: linear-gradient(145deg, rgba(22, 34, 60, 0.9), rgba(16, 24, 43, 0.9));
}

.mode-badge {
  align-self: flex-start;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  margin-bottom: 0.85rem;
}

.mode-badge.classic {
  background: rgba(0, 242, 254, 0.15);
  color: var(--neon-cyan);
  border: 1px solid rgba(0, 242, 254, 0.3);
}

.mode-badge.blitz {
  background: rgba(247, 37, 133, 0.15);
  color: var(--neon-pink);
  border: 1px solid rgba(247, 37, 133, 0.3);
}

.mode-badge.pro {
  background: rgba(255, 209, 102, 0.15);
  color: var(--neon-gold);
  border: 1px solid rgba(255, 209, 102, 0.3);
}

.mode-name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.4rem;
}

.mode-desc {
  font-size: 0.85rem;
  color: #94a3b8;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.mode-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: #cbd5e1;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* Action Hub */
.action-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.4rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  user-select: none;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-cyan-dark));
  color: #04101e;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(0, 242, 254, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(0, 242, 254, 0.45);
}

.btn-secondary {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: #f1f5f9;
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.btn-pink {
  background: linear-gradient(135deg, var(--neon-pink), var(--neon-pink-dark));
  color: #fff;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(247, 37, 133, 0.35);
}

.btn-pink:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(247, 37, 133, 0.5);
}

.btn-danger {
  background: rgba(239, 71, 111, 0.15);
  border: 1px solid rgba(239, 71, 111, 0.3);
  color: #ff4d6d;
}

.btn-danger:hover {
  background: rgba(239, 71, 111, 0.25);
  border-color: rgba(239, 71, 111, 0.6);
}

.btn-sm {
  padding: 0.45rem 0.85rem;
  font-size: 0.82rem;
  border-radius: 8px;
}

/* ===================================================================
   ONLINE PLAYERS PANEL (LOBBY RIGHT SIDEBAR)
   =================================================================== */
.online-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-md);
  max-height: 820px;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.panel-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.search-box {
  position: relative;
  margin-bottom: 1rem;
}

.search-input {
  width: 100%;
  padding: 0.65rem 1rem 0.65rem 2.4rem;
  background: rgba(10, 15, 28, 0.6);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: #fff;
  font-size: 0.85rem;
  outline: none;
  transition: all var(--transition-fast);
}

.search-input:focus {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 10px rgba(0, 242, 254, 0.2);
}

.search-icon {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: #64748b;
  font-size: 0.9rem;
}

.players-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  overflow-y: auto;
  padding-right: 0.25rem;
  flex-grow: 1;
}

/* Custom Scrollbar */
.players-list::-webkit-scrollbar,
.chat-messages::-webkit-scrollbar {
  width: 6px;
}

.players-list::-webkit-scrollbar-track,
.chat-messages::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.02);
  border-radius: 10px;
}

.players-list::-webkit-scrollbar-thumb,
.chat-messages::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 10px;
}

.players-list::-webkit-scrollbar-thumb:hover,
.chat-messages::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 242, 254, 0.4);
}

/* Player Card */
.player-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1rem;
  background: rgba(14, 21, 38, 0.6);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  transition: all var(--transition-fast);
}

.player-card:hover {
  background: rgba(20, 30, 54, 0.8);
  border-color: var(--border-hover);
  transform: translateX(2px);
}

.player-card.is-self {
  border-color: rgba(0, 242, 254, 0.35);
  background: rgba(0, 242, 254, 0.05);
}

.player-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.player-avatar {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.07);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  position: relative;
  flex-shrink: 0;
}

.player-status-dot {
  position: absolute;
  bottom: -2px;
  right: -2px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid var(--bg-primary);
}

.status-lobby {
  background-color: var(--neon-green);
  box-shadow: 0 0 6px var(--neon-green);
}

.status-in_game {
  background-color: var(--neon-pink);
  box-shadow: 0 0 6px var(--neon-pink);
}

.status-in_queue, .status-waiting_room {
  background-color: var(--neon-gold);
  box-shadow: 0 0 6px var(--neon-gold);
}

.player-details {
  display: flex;
  flex-direction: column;
}

.player-name-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.player-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: #fff;
  max-width: 120px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.self-badge {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--neon-cyan);
  background: rgba(0, 242, 254, 0.15);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
}

.player-meta {
  font-size: 0.75rem;
  color: #94a3b8;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.challenge-btn {
  padding: 0.45rem 0.85rem;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: 8px;
  border: 1px solid rgba(0, 242, 254, 0.35);
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.15), rgba(0, 242, 254, 0.05));
  color: var(--neon-cyan);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  transition: all var(--transition-fast);
}

.challenge-btn:hover:not(:disabled) {
  background: var(--neon-cyan);
  color: #080c16;
  box-shadow: 0 0 14px rgba(0, 242, 254, 0.4);
  transform: translateY(-1px);
}

.challenge-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  border-color: rgba(255, 255, 255, 0.1);
  color: #94a3b8;
}

.empty-players {
  text-align: center;
  padding: 2.5rem 1rem;
  color: #64748b;
  font-size: 0.9rem;
}

.empty-players-icon {
  font-size: 2.5rem;
  margin-bottom: 0.6rem;
  opacity: 0.6;
}

/* ===================================================================
   GAME ARENA VIEW
   =================================================================== */
.game-view {
  display: none;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
}

.game-view.active {
  display: flex;
}

.lobby-view.hidden {
  display: none;
}

/* Match Header & VS Bar */
.game-header {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 1.25rem 1.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-md);
  position: relative;
}

.player-duel-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1.25rem;
  border-radius: 14px;
  background: rgba(10, 15, 28, 0.6);
  border: 2px solid transparent;
  transition: all var(--transition-normal);
  position: relative;
  min-width: 220px;
}

.player-duel-card.x-player {
  border-color: rgba(0, 242, 254, 0.2);
}

.player-duel-card.o-player {
  border-color: rgba(247, 37, 133, 0.2);
  flex-direction: row-reverse;
  text-align: right;
}

.player-duel-card.active-turn {
  transform: scale(1.03);
}

.player-duel-card.x-player.active-turn {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 25px rgba(0, 242, 254, 0.4);
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.12), rgba(10, 15, 28, 0.8));
}

.player-duel-card.o-player.active-turn {
  border-color: var(--neon-pink);
  box-shadow: 0 0 25px rgba(247, 37, 133, 0.4);
  background: linear-gradient(135deg, rgba(247, 37, 133, 0.12), rgba(10, 15, 28, 0.8));
}

.duel-avatar {
  width: 50px;
  height: 50px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  position: relative;
}

.mark-tag {
  position: absolute;
  top: -6px;
  right: -6px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 900;
  box-shadow: var(--shadow-sm);
}

.mark-tag.x-tag {
  background: var(--neon-cyan);
  color: #04101e;
}

.mark-tag.o-tag {
  background: var(--neon-pink);
  color: #fff;
}

.duel-name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  max-width: 120px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.duel-score {
  font-size: 0.8rem;
  color: #94a3b8;
  font-weight: 600;
}

.duel-turn-timer {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--neon-gold);
  margin-top: 0.15rem;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

/* Match Center Status */
.duel-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  text-align: center;
}

.vs-badge {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.1rem;
  letter-spacing: 2px;
  color: #64748b;
}

.match-mode-pill {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.65rem;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 9999px;
  color: #cbd5e1;
}

.turn-indicator-text {
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
}

/* ===================================================================
   BOARD ARENA
   =================================================================== */
.board-container {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.board-grid {
  display: grid;
  gap: 8px;
  user-select: none;
  background: rgba(14, 21, 38, 0.8);
  padding: 12px;
  border-radius: 18px;
  box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

/* Mode-specific Grid styling */
.board-grid.grid-3x3 {
  grid-template-columns: repeat(3, 110px);
  grid-template-rows: repeat(3, 110px);
  gap: 12px;
}

.board-grid.grid-5x5 {
  grid-template-columns: repeat(5, 75px);
  grid-template-rows: repeat(5, 75px);
  gap: 8px;
}

.board-grid.grid-10x10 {
  grid-template-columns: repeat(10, 44px);
  grid-template-rows: repeat(10, 44px);
  gap: 4px;
  padding: 8px;
}

@media (max-width: 600px) {
  .board-grid.grid-3x3 {
    grid-template-columns: repeat(3, 85px);
    grid-template-rows: repeat(3, 85px);
    gap: 8px;
  }
  .board-grid.grid-5x5 {
    grid-template-columns: repeat(5, 54px);
    grid-template-rows: repeat(5, 54px);
    gap: 5px;
  }
  .board-grid.grid-10x10 {
    grid-template-columns: repeat(10, 31px);
    grid-template-rows: repeat(10, 31px);
    gap: 2px;
    padding: 4px;
  }
}

/* Board Cell */
.cell {
  background: rgba(22, 34, 60, 0.85);
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.board-grid.grid-10x10 .cell {
  border-radius: 6px;
}

.cell:hover:not(.taken) {
  background: rgba(30, 48, 84, 0.95);
  border-color: rgba(255, 255, 255, 0.25);
  transform: scale(0.98);
}

.cell.taken {
  cursor: default;
}

/* Cell Marks */
.cell-mark {
  font-family: var(--font-display);
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  animation: markPop 0.25s var(--transition-bounce) forwards;
}

@keyframes markPop {
  0% { transform: scale(0.2) rotate(-15deg); opacity: 0; }
  70% { transform: scale(1.15) rotate(5deg); }
  100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

.grid-3x3 .cell-mark {
  font-size: 3.5rem;
}
.grid-5x5 .cell-mark {
  font-size: 2.2rem;
}
.grid-10x10 .cell-mark {
  font-size: 1.4rem;
}

.mark-x {
  color: var(--neon-cyan);
  text-shadow: 0 0 16px var(--neon-cyan);
}

.mark-o {
  color: var(--neon-pink);
  text-shadow: 0 0 16px var(--neon-pink);
}

/* Ghost Preview on hover */
.cell.ghost-x::before {
  content: 'X';
  font-family: var(--font-display);
  font-weight: 900;
  color: rgba(0, 242, 254, 0.25);
  opacity: 0.7;
}
.cell.ghost-o::before {
  content: 'O';
  font-family: var(--font-display);
  font-weight: 900;
  color: rgba(247, 37, 133, 0.25);
  opacity: 0.7;
}
.grid-3x3 .cell.ghost-x::before, .grid-3x3 .cell.ghost-o::before { font-size: 3.5rem; }
.grid-5x5 .cell.ghost-x::before, .grid-5x5 .cell.ghost-o::before { font-size: 2.2rem; }
.grid-10x10 .cell.ghost-x::before, .grid-10x10 .cell.ghost-o::before { font-size: 1.4rem; }

/* Last move highlight */
.cell.last-move {
  box-shadow: inset 0 0 0 2px var(--neon-gold), 0 0 12px rgba(255, 209, 102, 0.4);
}

/* Winning cells highlight */
.cell.winning-cell {
  background: linear-gradient(135deg, rgba(255, 209, 102, 0.35), rgba(255, 183, 3, 0.2)) !important;
  border-color: var(--neon-gold) !important;
  box-shadow: 0 0 20px var(--neon-gold), inset 0 0 12px var(--neon-gold);
  animation: winningPulse 1.2s infinite alternate ease-in-out;
  z-index: 2;
}

@keyframes winningPulse {
  0% { transform: scale(1); filter: brightness(1); }
  100% { transform: scale(1.04); filter: brightness(1.3); }
}

/* Game Footer & In-Game Controls */
.game-bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.emotes-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-card);
  padding: 0.4rem 0.6rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.emote-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: transparent;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.emote-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: scale(1.2);
}

.game-actions-group {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

/* Emote Floating Overlay */
.floating-emote {
  position: absolute;
  font-size: 2.8rem;
  pointer-events: none;
  animation: floatUp 2s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
  z-index: 50;
  text-shadow: 0 4px 12px rgba(0, 0, 0, 0.6);
}

@keyframes floatUp {
  0% { opacity: 0; transform: translateY(20px) scale(0.5); }
  20% { opacity: 1; transform: translateY(-10px) scale(1.2); }
  80% { opacity: 1; transform: translateY(-70px) scale(1); }
  100% { opacity: 0; transform: translateY(-110px) scale(0.8); }
}

/* Chat Drawer */
.chat-drawer {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  height: 180px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.chat-messages {
  flex-grow: 1;
  padding: 0.85rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.85rem;
}

.chat-bubble {
  padding: 0.35rem 0.75rem;
  border-radius: 8px;
  max-width: 80%;
  word-break: break-word;
}

.chat-bubble.mine {
  align-self: flex-end;
  background: rgba(0, 242, 254, 0.15);
  border: 1px solid rgba(0, 242, 254, 0.3);
  color: #fff;
}

.chat-bubble.theirs {
  align-self: flex-start;
  background: rgba(247, 37, 133, 0.15);
  border: 1px solid rgba(247, 37, 133, 0.3);
  color: #fff;
}

.chat-input-bar {
  display: flex;
  border-top: 1px solid var(--border-color);
  padding: 0.4rem 0.6rem;
  gap: 0.4rem;
  background: rgba(10, 15, 28, 0.5);
}

.chat-input {
  flex-grow: 1;
  background: transparent;
  border: none;
  outline: none;
  color: #fff;
  font-size: 0.85rem;
}

/* ===================================================================
   MODALS
   =================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1.25rem;
  animation: fadeIn 0.2s ease;
}

.modal-overlay.active {
  display: flex;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-box {
  background: linear-gradient(135deg, rgba(22, 34, 60, 0.95), rgba(14, 20, 36, 0.98));
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 24px;
  width: 100%;
  max-width: 480px;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  animation: scaleUp 0.25s var(--transition-bounce);
  position: relative;
}

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

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.modal-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.modal-close-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #94a3b8;
  font-size: 1.25rem;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  line-height: 1;
}

.modal-close-btn:hover {
  background: rgba(239, 71, 111, 0.2);
  border-color: rgba(239, 71, 111, 0.4);
  color: #ff4d6d;
  transform: scale(1.05);
}

/* Challenge Modal Details */
.challenge-countdown-bar {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  overflow: hidden;
  margin: 1.25rem 0;
}

.challenge-countdown-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--neon-cyan), var(--neon-pink));
  width: 100%;
  transition: width 1s linear;
}

.challenger-preview {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: rgba(10, 15, 28, 0.6);
  border-radius: 16px;
  border: 1px solid var(--border-color);
  margin-bottom: 1.25rem;
}

.challenger-avatar {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

/* Form Groups in Modals */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: #cbd5e1;
  margin-bottom: 0.45rem;
}

.form-input, .form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  background: rgba(10, 15, 28, 0.8);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  color: #fff;
  font-size: 0.95rem;
  outline: none;
  transition: all var(--transition-fast);
}

.form-input:focus, .form-select:focus {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 12px rgba(0, 242, 254, 0.25);
}

.avatar-selector {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.avatar-option {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
  border: 2px solid transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.avatar-option:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: scale(1.1);
}

.avatar-option.selected {
  border-color: var(--neon-cyan);
  background: rgba(0, 242, 254, 0.15);
  box-shadow: 0 0 10px rgba(0, 242, 254, 0.3);
}

/* ===================================================================
   TOAST NOTIFICATIONS
   =================================================================== */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  z-index: 9999;
  pointer-events: none;
}

.toast {
  background: rgba(16, 24, 43, 0.95);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  padding: 0.85rem 1.25rem;
  border-radius: 14px;
  color: #fff;
  font-size: 0.9rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  pointer-events: auto;
  animation: slideInRight 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
  max-width: 380px;
}

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

.toast.toast-success {
  border-color: rgba(6, 214, 160, 0.4);
}
.toast.toast-error {
  border-color: rgba(239, 71, 111, 0.4);
}
.toast.toast-info {
  border-color: rgba(0, 242, 254, 0.4);
}

/* Matchmaking Overlay Spinner */
.queue-overlay {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2.5rem;
  text-align: center;
}

.queue-overlay.active {
  display: flex;
}

.radar-spinner {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  border: 3px solid rgba(0, 242, 254, 0.15);
  border-top-color: var(--neon-cyan);
  border-right-color: var(--neon-pink);
  animation: spin 1.2s infinite linear;
  margin-bottom: 1.5rem;
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.2);
}

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