/* ===== RESET & VARIABLES ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
    font-family: "Outfit", sans-serif;
}

:root {
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --primary: #667eea;
  --primary-dark: #5a67d8;
  --secondary: #f093fb;
  --accent-x: #4f46e5;
  --accent-o: #ec4899;
  --bg-light: #eef2ff;
  --bg-card: #ffffff;
  --bg-elevated: #f8fafc;
  --border: #e2e8f0;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-light: #94a3b8;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow-md: 0 8px 16px -4px rgba(0,0,0,0.1);
  --shadow-lg: 0 16px 32px -8px rgba(0,0,0,0.15);
  --shadow-xl: 0 24px 48px -12px rgba(0,0,0,0.2);
  --shadow-3d: 0 8px 0 rgba(0,0,0,0.1);
  --shadow-3d-hover: 0 4px 0 rgba(0,0,0,0.1);
  --shadow-3d-active: 0 2px 0 rgba(0,0,0,0.1);
  --shadow-3d-card: 0 20px 25px -12px rgba(0,0,0,0.2), 0 8px 0 -2px rgba(102,126,234,0.3);
  --shadow-3d-cell: 0 6px 0 rgba(0,0,0,0.08);
  --shadow-3d-cell-hover: 0 3px 0 rgba(0,0,0,0.08);
  --shadow-3d-btn: 0 5px 0 #4a3b8c;
  --shadow-3d-btn-hover: 0 2px 0 #4a3b8c;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
}

/* Dark theme variables */
body.dark-theme {
  --bg-light: #0a0a14;
  --bg-card: #111827;
  --bg-elevated: #1e293b;
  --border: #334155;
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-light: #64748b;
  --shadow-lg: 0 16px 32px -8px rgba(0,0,0,0.4);
  --shadow-xl: 0 24px 48px -12px rgba(0,0,0,0.5);
  --shadow-3d: 0 8px 0 rgba(0,0,0,0.3);
  --shadow-3d-hover: 0 4px 0 rgba(0,0,0,0.3);
  --shadow-3d-active: 0 2px 0 rgba(0,0,0,0.3);
  --shadow-3d-card: 0 20px 25px -12px rgba(0,0,0,0.4), 0 8px 0 -2px rgba(102,126,234,0.2);
  --shadow-3d-cell: 0 6px 0 rgba(0,0,0,0.2);
  --shadow-3d-cell-hover: 0 3px 0 rgba(0,0,0,0.2);
}

body {
  font-family: 'Inter', sans-serif;
  background:
      linear-gradient(rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.8)),
    url("images/lightbg.png"),
    linear-gradient(145deg, var(--bg-light) 0%, #e0e7ff 100%);
  background-size: cover, cover, cover;
  background-position: center, center, center;
  background-repeat: no-repeat, no-repeat, no-repeat;
  min-height: 100vh;
  height: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: background 0.3s ease, color 0.3s ease;
  position: relative;
  overflow-x: hidden;
  overflow-y: auto;
  perspective: 1200px;
}

body.dark-theme {
  background:
    linear-gradient(rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.8)),
    url("images/darkbg.png"),
    linear-gradient(145deg, #0a0a14 0%, #0f0f1a 100%);
  background-size: cover, cover, cover;
  background-position: center, center, center;
  background-repeat: no-repeat, no-repeat, no-repeat;
}

/* Particles Background with 3D float */
.particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
  transform-style: preserve-3d;
}

.particle {
  position: absolute;
  background: linear-gradient(135deg, #667eea, #764ba2);
  border-radius: 50%;
  opacity: 0.12;
  animation: float3d 18s infinite ease-in-out;
  box-shadow: 0 0 20px rgba(102,126,234,0.3);
}

@keyframes float3d {
  0%, 100% { 
    transform: translateY(0) translateZ(0) rotate(0deg); 
  }
  25% { 
    transform: translateY(-60px) translateZ(50px) rotate(90deg); 
  }
  50% { 
    transform: translateY(-120px) translateZ(100px) rotate(180deg); 
  }
  75% { 
    transform: translateY(-60px) translateZ(50px) rotate(270deg); 
  }
}

#app {
  width: 100%;
  max-width: 650px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
  height: auto;
  min-height: 100vh;
  padding: 20px;
  box-sizing: border-box;
  overflow: visible;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hidden {
  display: none !important;
}

/* ===== LOADING SCREEN ===== */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    linear-gradient(rgba(10, 10, 20, 0.5), rgba(10, 10, 20, 0.7)),
    url("images/lightbg.png"),
    linear-gradient(145deg, var(--bg-light) 0%, #e0e7ff 100%);
  background-size: cover, cover, cover;
  background-position: center, center, center;
  background-repeat: no-repeat, no-repeat, no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}

body.dark-theme .loading-screen {
  background:
    linear-gradient(rgba(0, 0, 0, 0.65), rgba(0, 0, 0, 0.85)),
    url("images/darkbg.png"),
    linear-gradient(145deg, #0a0a14 0%, #0f0f1a 100%);
  background-size: cover, cover, cover;
  background-position: center, center, center;
  background-repeat: no-repeat, no-repeat, no-repeat;
}

.loading-screen.fade-out {
  opacity: 0;
  pointer-events: none;
}

.loading-container {
  text-align: center;
  transform: translateZ(50px);
}

.premium-loader {
  position: relative;
  width: 120px;
  height: 120px;
  margin: 0 auto 30px;
  transform-style: preserve-3d;
}

.loader-ring, .loader-ring2 {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 3px solid transparent;
  border-radius: 50%;
  box-shadow: 0 0 20px rgba(255,255,255,0.3);
}

.loader-ring {
  border-top-color: rgba(255,255,255,0.9);
  animation: spin3d 1s linear infinite;
}

.loader-ring2 {
  border-right-color: rgba(255,255,255,0.5);
  width: 80%;
  height: 80%;
  top: 10%;
  left: 10%;
  animation: spin3d 1.5s linear infinite reverse;
}

@keyframes spin3d {
  to { transform: rotate3d(0, 0, 1, 360deg); }
}

.loader-logo {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) translateZ(20px);
}

.loader-logo i {
  font-size: 40px;
  color: white;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.2));
}

.loading-title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: 3px;
  color: white;
  margin-bottom: 25px;
  text-shadow: 0 4px 12px rgba(0,0,0,0.3);
  transform: translateZ(20px);
}

.loading-progress {
  width: 250px;
  height: 4px;
  background: rgba(255,255,255,0.3);
  border-radius: 10px;
  margin: 0 auto 15px;
  overflow: hidden;
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.1);
}

.progress-bar {
  width: 0%;
  height: 100%;
  background: white;
  border-radius: 10px;
  animation: progressAnim 2.2s ease forwards;
  box-shadow: 0 0 8px white;
}

@keyframes progressAnim {
  0% { width: 0%; }
  100% { width: 100%; }
}

.loading-status {
  color: rgba(255,255,255,0.9);
  font-size: 13px;
  font-weight: 500;
  text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

/* ===== SETTINGS SCREEN - FULLY RESPONSIVE ===== */
.settings-screen {
  position: relative;
  width: 100%;
  min-height: auto;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  perspective: 800px;
  padding: 0;
}

.settings-container {
  width: 100%;
  position: relative;
  padding: 0;
}

.settings-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 40%, rgba(102,126,234,0.1), transparent);
  pointer-events: none;
  filter: blur(30px);
  z-index: -1;
}

.premium-card {
  background: var(--bg-card);
  border-radius: 32px;
  padding: 28px 24px;
  position: relative;
  box-shadow: var(--shadow-3d-card), var(--shadow-xl);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(102,126,234,0.3);
  transition: all 0.3s ease;
  transform: translateY(0) translateZ(0);
  width: 100%;
}

.premium-card:hover {
  transform: translateY(-4px) translateZ(10px);
  box-shadow: 0 24px 30px -12px rgba(0,0,0,0.25), 0 8px 0 -2px rgba(102,126,234,0.4);
}

.card-badge {
  position: absolute;
  top: -12px;
  right: 20px;
  background: var(--primary-gradient);
  padding: 5px 14px;
  border-radius: 40px;
  font-size: 10px;
  font-weight: 700;
  color: white;
  letter-spacing: 1px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
  transform: translateY(0) translateZ(20px);
  white-space: nowrap;
}

.card-badge i {
  margin-right: 5px;
}

.settings-header {
  text-align: center;
  margin-bottom: 28px;
  position: relative;
}

.header-glow {
  position: absolute;
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 70px;
  height: 70px;
  background: radial-gradient(circle, rgba(102,126,234,0.2), transparent);
  border-radius: 50%;
  filter: blur(15px);
}

.header-icon {
  font-size: 42px;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 10px;
  filter: drop-shadow(0 4px 8px rgba(102,126,234,0.3));
}

.settings-header h2 {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-main);
  text-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.settings-header p {
  color: var(--text-muted);
  font-size: 12px;
}

.settings-group {
  margin-bottom: 24px;
}

.settings-row {
  display: flex;
  gap: 14px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.settings-group.half {
  flex: 1;
  min-width: 0;
  margin-bottom: 0;
}

.settings-group label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.mode-selector {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.mode-option {
  flex: 1;
  min-width: 120px;
  background: var(--bg-elevated);
  border: 2px solid var(--border);
  border-radius: 20px;
  padding: 14px 12px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-3d);
  transform: translateY(-2px);
}

.mode-option:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 rgba(0,0,0,0.1);
}

.mode-option i {
  font-size: 24px;
  color: var(--text-muted);
  transition: all 0.3s;
}

.option-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.option-title {
  font-weight: 700;
  font-size: 14px;
  color: var(--text-main);
}

.option-desc {
  font-size: 10px;
  color: var(--text-muted);
}

.mode-option.active {
  background: linear-gradient(135deg, #667eea15, #764ba215);
  border-color: var(--primary);
  box-shadow: 0 6px 0 rgba(102,126,234,0.3);
  transform: translateY(-2px);
}

.mode-option.active i {
  color: var(--primary);
}

.premium-input {
  position: relative;
}

.input-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  color: var(--text-muted);
}

.premium-input input {
  width: 100%;
  background: var(--bg-elevated);
  border: 2px solid var(--border);
  padding: 13px 16px 13px 44px;
  border-radius: 28px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-main);
  transition: all 0.2s;
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.05), 0 2px 0 rgba(0,0,0,0.05);
}

.premium-input input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(102,126,234,0.2), inset 0 1px 2px rgba(0,0,0,0.05);
}

.difficulty-selector {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.diff-card {
  flex: 1;
  min-width: 90px;
  background: var(--bg-elevated);
  border: 2px solid var(--border);
  border-radius: 18px;
  padding: 12px 6px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--shadow-3d);
  transform: translateY(-2px);
}

.diff-card:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 rgba(0,0,0,0.1);
}

.diff-card i {
  font-size: 20px;
  display: block;
  margin-bottom: 5px;
  color: var(--text-muted);
}

.diff-card span {
  font-weight: 700;
  font-size: 12px;
  display: block;
  color: var(--text-main);
}

.diff-card small {
  font-size: 9px;
  color: var(--text-muted);
}

.diff-card.active {
  background: var(--primary-gradient);
  border-color: transparent;
  box-shadow: 0 6px 0 #4a3b8c;
  transform: translateY(-2px);
}

.diff-card.active i,
.diff-card.active span,
.diff-card.active small {
  color: white;
}

.theme-selector {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.theme-option {
  flex: 1;
  min-width: 100px;
  background: var(--bg-elevated);
  border: 2px solid var(--border);
  border-radius: 28px;
  padding: 11px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--shadow-3d);
  transform: translateY(-2px);
  text-align: center;
}

.theme-option:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 rgba(0,0,0,0.1);
}

.theme-option i {
  margin-right: 6px;
}

.theme-option.active {
  background: var(--primary-gradient);
  border-color: transparent;
  color: white;
  box-shadow: 0 6px 0 #4a3b8c;
  transform: translateY(-2px);
}

.btn-premium {
  width: 100%;
  background: var(--primary-gradient);
  border: none;
  padding: 16px;
  border-radius: 40px;
  font-size: 16px;
  font-weight: 700;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all 0.1s ease;
  box-shadow: var(--shadow-3d-btn);
  transform: translateY(-2px);
}

.btn-premium:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 0 #4a3b8c;
}

.btn-premium:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 #4a3b8c;
}

.btn-shine {
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: shine 3s infinite;
}

@keyframes shine {
  to { left: 100%; }
}

/* ===== GAME SCREEN ===== */
.game-screen {
  display: flex;
  flex-direction: column;
  gap: clamp(12px, 2vh, 20px);
  flex: 1;
  min-height: 0;
  justify-content: space-between;
}

.premium-header {
  background: var(--bg-card);
  border-radius: 40px;
  padding: clamp(12px, 2vh, 18px) clamp(16px, 2vw, 22px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-3d-card), var(--shadow-md);
  border: 1px solid var(--border);
  transition: all 0.3s ease;
  transform: translateZ(5px);
}

.player-premium-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-elevated);
  padding: 8px 16px;
  border-radius: 60px;
  transition: all 0.3s ease;
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.02), 0 2px 4px rgba(0,0,0,0.05);
}

.player-icon {
  width: 44px;
  height: 44px;
  background: var(--bg-card);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 700;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.x-card .player-icon {
  color: var(--accent-x);
  border: 2px solid var(--accent-x);
  box-shadow: 0 4px 12px rgba(79,70,229,0.3);
}

.o-card .player-icon {
  color: var(--accent-o);
  border: 2px solid var(--accent-o);
  box-shadow: 0 4px 12px rgba(236,72,153,0.3);
}

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

.player-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--text-muted);
}

.player-name {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
}

.player-score {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-main);
  margin-left: 8px;
  text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.vs-premium {
  text-align: center;
}

.vs-premium i {
  font-size: 18px;
  color: var(--primary);
  animation: pulse3d 2s infinite;
  filter: drop-shadow(0 2px 4px rgba(102,126,234,0.5));
}

@keyframes pulse3d {
  0%, 100% { opacity: 1; transform: scale(1) translateZ(0); }
  50% { opacity: 0.7; transform: scale(1.15) translateZ(10px); }
}

.vs-premium span {
  font-size: 11px;
  font-weight: 700;
  display: block;
  color: var(--text-muted);
}

.control-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.turn-display {
  flex: 1;
  background: var(--bg-card);
  border-radius: 60px;
  padding: 10px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-3d), var(--shadow-md);
  transform: translateY(-2px);
}

.turn-ring {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--primary-gradient);
  animation: turnPulse3d 1s ease infinite;
  box-shadow: 0 0 8px var(--primary);
}

@keyframes turnPulse3d {
  0%, 100% { opacity: 0.5; width: 4px; transform: translateZ(0); }
  50% { opacity: 1; width: 8px; transform: translateZ(5px); }
}

.turn-display i {
  font-size: 16px;
  color: var(--primary);
  animation: rotate3d 2s linear infinite;
}

@keyframes rotate3d {
  from { transform: rotate(0deg) translateZ(0); }
  to { transform: rotate(360deg) translateZ(10px); }
}

.turn-display span {
  font-weight: 700;
  font-size: 13px;
  color: var(--text-main);
}

.action-group {
  display: flex;
  gap: 10px;
}

.premium-icon-btn {
  width: 44px;
  height: 44px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.1s ease;
  font-size: 16px;
  box-shadow: var(--shadow-3d);
  transform: translateY(-2px);
}

.premium-icon-btn:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-4px);
  box-shadow: 0 6px 0 #4a3b8c;
}

.premium-icon-btn:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 #4a3b8c;
}

/* Game Board */
.board-container {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  flex: 1;
  min-height: 0;
  perspective: 800px;
  margin: 10px 0;
}

.board-glow {
  position: absolute;
  top: -20px;
  left: -20px;
  right: -20px;
  bottom: -20px;
  background: radial-gradient(circle, rgba(102,126,234,0.15), transparent);
  border-radius: 60px;
  pointer-events: none;
  filter: blur(20px);
}

.game-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: clamp(6px, 1.2vmin, 10px);
  width: min(58vh, 60vw, 380px);
  height: min(58vh, 60vw, 380px);
  aspect-ratio: 1 / 1;
  position: relative;
  z-index: 1;
  transform-style: preserve-3d;
  transform: rotateX(2deg) translateZ(10px);
}

.cell {
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(28px, 6vmin, 44px);
  font-weight: 800;
  cursor: pointer;
  transition: all 0.12s linear;
  box-shadow: var(--shadow-3d-cell), var(--shadow-md);
  aspect-ratio: 1 / 1;
  line-height: 1;
  min-height: 0;
  transform: translateY(-3px) translateZ(5px);
  background: linear-gradient(145deg, var(--bg-card) 0%, var(--bg-elevated) 100%);
}

.cell:hover {
  transform: translateY(-6px) translateZ(10px);
  border-color: var(--primary);
  box-shadow: 0 9px 0 rgba(0,0,0,0.08), var(--shadow-lg);
}

.cell:active {
  transform: translateY(2px) translateZ(0);
  box-shadow: 0 2px 0 rgba(0,0,0,0.08);
}

.cell.x-move {
  color: var(--accent-x);
  animation: popIn3d 0.18s cubic-bezier(0.34, 1.3, 0.64, 1);
  text-shadow: 0 0 8px rgba(79,70,229,0.5);
}

.cell.o-move {
  color: var(--accent-o);
  animation: popIn3d 0.18s cubic-bezier(0.34, 1.3, 0.64, 1);
  text-shadow: 0 0 8px rgba(236,72,153,0.5);
}

@keyframes popIn3d {
  0% { 
    transform: scale(0.3) translateY(10px) translateZ(-20px); 
    opacity: 0; 
  }
  100% { 
    transform: scale(1) translateY(-3px) translateZ(5px); 
    opacity: 1; 
  }
}

.cell.win-highlight {
  background: linear-gradient(145deg, rgba(102,126,234,0.2), rgba(118,75,162,0.2));
  border-color: var(--primary);
  animation: winPulse3d 0.4s ease;
  box-shadow: 0 0 20px rgba(102,126,234,0.5), var(--shadow-3d-cell);
}

@keyframes winPulse3d {
  0%, 100% { transform: scale(1) translateY(-3px) translateZ(5px); }
  50% { transform: scale(1.05) translateY(-6px) translateZ(15px); }
}

.action-footer {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 5px;
}

.footer-premium {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 10px 24px;
  border-radius: 40px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.1s ease;
  box-shadow: var(--shadow-3d);
  transform: translateY(-2px);
}

.footer-premium:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 0 rgba(0,0,0,0.1);
}

.footer-premium:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 rgba(0,0,0,0.1);
}

.footer-premium.primary {
  background: var(--primary-gradient);
  border: none;
  color: white;
  box-shadow: var(--shadow-3d-btn);
}

.footer-premium.primary:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 0 #4a3b8c;
}

.footer-premium.primary:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 #4a3b8c;
}

/* ===== MODALS ===== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.75);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1500;
  visibility: hidden;
  opacity: 0;
  transition: all 0.25s;
}

.modal.active {
  visibility: visible;
  opacity: 1;
}

.modal-container {
  background: var(--bg-card);
  border-radius: 40px;
  padding: 28px 24px;
  width: 90%;
  max-width: 380px;
  text-align: center;
  animation: modalPop3d 0.35s cubic-bezier(0.34, 1.2, 0.64, 1);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-3d-card), var(--shadow-xl);
  transform-style: preserve-3d;
}

@keyframes modalPop3d {
  from {
    opacity: 0;
    transform: scale(0.85) translateY(30px) translateZ(-50px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0) translateZ(0);
  }
}

.result-container {
  max-width: 360px;
}

.result-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 16px;
  background: linear-gradient(145deg, rgba(102,126,234,0.2), rgba(118,75,162,0.2));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

.result-icon i {
  font-size: 42px;
  color: var(--warning);
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.2));
}

.modal-container h2, .modal-container h3 {
  font-size: 26px;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--text-main);
}

.modal-container p {
  color: var(--text-muted);
  margin-bottom: 24px;
  font-size: 14px;
}

.result-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.premium-btn {
  flex: 1;
  min-width: 120px;
  padding: 13px;
  border-radius: 40px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.1s ease;
  border: none;
  font-family: inherit;
  box-shadow: var(--shadow-3d);
  transform: translateY(-2px);
}

.premium-btn:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 rgba(0,0,0,0.1);
}

.premium-btn.primary {
  background: var(--primary-gradient);
  color: white;
  box-shadow: var(--shadow-3d-btn);
}

.premium-btn.primary:active {
  box-shadow: 0 2px 0 #4a3b8c;
}

.premium-btn.secondary {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-main);
}

.premium-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.premium-grid-btn {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 11px;
  border-radius: 32px;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  transition: all 0.1s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  box-shadow: var(--shadow-3d);
  transform: translateY(-2px);
}

.premium-grid-btn:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 rgba(0,0,0,0.1);
}

.premium-grid-btn:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: 0 6px 0 #4a3b8c;
}

.modal-header-stats {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.modal-close {
  background: none;
  border: none;
  font-size: 26px;
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.2s;
}

.modal-close:hover {
  color: var(--error);
  transform: scale(1.1);
}

.modal-icon-center {
  width: 65px;
  height: 65px;
  margin: 0 auto 14px;
  background: linear-gradient(145deg, rgba(102,126,234,0.2), rgba(118,75,162,0.2));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 12px rgba(0,0,0,0.1);
}

.modal-icon-center i {
  font-size: 32px;
  color: var(--primary);
}

.stats-content {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.stat-card {
  background: var(--bg-elevated);
  padding: 14px;
  border-radius: 22px;
  text-align: center;
  transition: all 0.2s;
  box-shadow: var(--shadow-3d);
  transform: translateY(-2px);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 0 rgba(0,0,0,0.1);
}

.stat-label {
  display: block;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 5px;
}

.stat-value {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary);
  text-shadow: 0 2px 4px rgba(102,126,234,0.3);
}

/* ===== TOAST NOTIFICATION ===== */
.toast-premium {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px) translateZ(20px);
  background: var(--text-main);
  color: white;
  padding: 10px 20px;
  border-radius: 60px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 500;
  z-index: 1600;
  transition: all 0.3s ease;
  opacity: 0;
  visibility: hidden;
  box-shadow: var(--shadow-3d), var(--shadow-lg);
  white-space: nowrap;
}

.toast-premium.show {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0) translateZ(20px);
}

.toast-premium i {
  font-size: 14px;
}

/* ===== RESPONSIVE DESIGN - MOBILE FIRST SETTINGS FIX ===== */
/* Small phones (up to 480px) */
@media (max-width: 480px) {
  body {
    padding: 0;
    height: auto;
    min-height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
  }

  #app {
    height: auto;
    min-height: 100vh;
    overflow: visible;
    padding: 16px;
    width: 100%;
    max-width: 100%;
  }

  .game-screen,
  .settings-screen,
  .settings-container {
    max-width: 100%;
    overflow-x: hidden;
  }

  /* Settings Screen Mobile Fix */
  .settings-screen {
    padding: 0;
    min-height: auto;
  }

  .settings-container {
    padding: 0;
  }

  .premium-card {
    padding: 20px 16px;
    border-radius: 28px;
    width: 100%;
    margin: 0;
  }

  .premium-card:hover {
    transform: translateY(-2px) translateZ(5px);
  }

  .card-badge {
    top: 8px;
    right: 12px;
    font-size: 9px;
    padding: 4px 12px;
    border-radius: 16px;
  }

  .settings-header {
    margin-bottom: 20px;
  }

  .settings-header h2 {
    font-size: 22px;
  }

  .settings-header p {
    font-size: 11px;
  }

  .header-icon {
    font-size: 36px;
  }

  .settings-group {
    margin-bottom: 20px;
  }

  .settings-row {
    flex-direction: column;
    gap: 16px;
    margin-bottom: 20px;
  }

  .settings-group.half {
    width: 100%;
    margin-bottom: 0;
  }

  .settings-group label {
    font-size: 10px;
    margin-bottom: 8px;
  }

  /* Mode selector - column on mobile */
  .mode-selector {
    flex-direction: column;
    gap: 10px;
  }

  .mode-option {
    width: 100%;
    min-width: unset;
    padding: 12px;
    border-radius: 18px;
  }

  .mode-option i {
    font-size: 22px;
  }

  .option-title {
    font-size: 13px;
  }

  .option-desc {
    font-size: 10px;
  }

  /* Difficulty selector - row wrap on mobile */
  .difficulty-selector {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .diff-card {
    min-width: calc(33% - 6px);
    flex: 1 1 auto;
    padding: 10px 4px;
    border-radius: 16px;
  }

  .diff-card i {
    font-size: 18px;
  }

  .diff-card span {
    font-size: 11px;
  }

  .diff-card small {
    font-size: 8px;
  }

  /* Theme selector - row on mobile */
  .theme-selector {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .theme-option {
    min-width: calc(50% - 4px);
    flex: 1 1 auto;
    padding: 10px;
    font-size: 12px;
    border-radius: 24px;
  }

  /* Input field */
  .premium-input input {
    padding: 12px 16px 12px 42px;
    font-size: 13px;
    border-radius: 24px;
  }

  .input-icon {
    left: 14px;
    font-size: 13px;
  }

  /* Button */
  .btn-premium {
    padding: 14px;
    font-size: 15px;
    border-radius: 36px;
    margin-top: 6px;
  }

  /* Game screen adjustments */
  .game-board {
    width: min(70vw, 320px);
    height: min(70vw, 320px);
    gap: 8px;
  }

  .cell {
    font-size: 32px;
    border-radius: 18px;
  }

  .premium-header {
    padding: 8px 10px;
    flex-wrap: nowrap;
    justify-content: space-between;
    gap: 8px;
  }

  .player-premium-card {
    padding: 4px 6px;
    flex: 1 1 0;
    min-width: 0;
  }

  .player-icon {
    width: 32px;
    height: 32px;
    font-size: 16px;
  }

  .player-name {
    font-size: 9px;
  }

  .player-score {
    font-size: 16px;
  }

  .player-label {
    font-size: 8px;
  }

  .vs-premium i {
    font-size: 14px;
  }

  .vs-premium span {
    font-size: 9px;
  }

  .player-stats {
    display: flex;
  }

  .vs-premium i {
    font-size: 16px;
  }

  .vs-premium span {
    font-size: 10px;
  }

  .control-bar {
    flex-wrap: wrap;
  }

  .turn-display {
    padding: 8px 14px;
  }

  .turn-display span {
    font-size: 12px;
  }

  .action-group {
    gap: 8px;
  }

  .premium-icon-btn {
    width: 40px;
    height: 40px;
    font-size: 15px;
  }

  .footer-premium {
    padding: 8px 18px;
    font-size: 12px;
  }

  .footer-premium span {
    display: inline-block;
  }

  /* Modals */
  .modal-container {
    padding: 22px 18px;
    border-radius: 32px;
    width: 92%;
  }

  .modal-container h2, .modal-container h3 {
    font-size: 22px;
  }

  .result-icon {
    width: 70px;
    height: 70px;
  }

  .result-icon i {
    font-size: 36px;
  }

  .premium-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .stats-content {
    grid-template-columns: 1fr;
    gap: 12px;
  }

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

  .premium-btn {
    padding: 12px;
    min-width: unset;
  }
}

/* Extra small phones (up to 380px) */
@media (max-width: 380px) {
  #app {
    padding: 12px;
  }

  .premium-card {
    padding: 16px 14px;
    border-radius: 24px;
  }

  .settings-header h2 {
    font-size: 20px;
  }

  .mode-option {
    padding: 10px;
    gap: 10px;
  }

  .mode-option i {
    font-size: 20px;
  }

  .diff-card {
    min-width: calc(33% - 6px);
    padding: 8px 3px;
  }

  .diff-card i {
    font-size: 16px;
  }

  .diff-card span {
    font-size: 10px;
  }

  .theme-option {
    padding: 8px;
    font-size: 11px;
  }

  .game-board {
    width: min(75vw, 280px);
    height: min(75vw, 280px);
    gap: 6px;
  }

  .cell {
    font-size: 28px;
    border-radius: 14px;
  }

  .player-icon {
    width: 34px;
    height: 34px;
    font-size: 16px;
  }

  .player-score {
    font-size: 20px;
  }

  .player-name {
    font-size: 10px;
  }

  .footer-premium span {
    display: none;
  }

  .footer-premium {
    padding: 8px 14px;
  }

  .footer-premium i {
    margin: 0;
  }
}

/* Medium phones (481px - 640px) */
@media (min-width: 481px) and (max-width: 640px) {
  #app {
    padding: 20px;
  }

  .premium-card {
    padding: 28px 24px;
    border-radius: 36px;
  }

  .mode-selector {
    flex-direction: row;
  }

  .difficulty-selector {
    flex-direction: row;
  }

  .theme-selector {
    flex-direction: row;
  }

  .game-board {
    width: min(55vw, 360px);
    height: min(55vw, 360px);
  }
}

/* Landscape mode fix */
@media (max-height: 500px) and (orientation: landscape) {
  body {
    height: auto;
    min-height: 100vh;
  }

  #app {
    height: auto;
    min-height: 100vh;
    padding: 12px;
  }

  .settings-screen {
    min-height: auto;
  }

  .premium-card {
    padding: 16px 20px;
  }

  .settings-header {
    margin-bottom: 12px;
  }

  .settings-header h2 {
    font-size: 20px;
  }

  .settings-group {
    margin-bottom: 12px;
  }

  .settings-row {
    margin-bottom: 12px;
    gap: 12px;
  }

  .mode-option {
    padding: 8px 12px;
  }

  .mode-option i {
    font-size: 20px;
  }

  .diff-card {
    padding: 8px 4px;
  }
}

/* ===== UTILITY CLASSES ===== */
.text-center {
  text-align: center;
}

.mt-2 {
  margin-top: 8px;
}

.mt-3 {
  margin-top: 16px;
}

.mb-2 {
  margin-bottom: 8px;
}

.mb-3 {
  margin-bottom: 16px;
}

/* ===== SCROLLBAR STYLING ===== */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-elevated);
  border-radius: 10px;
}

::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-dark);
}

body.dark-theme .toast-premium {
  color: #0f172a;
}