/* ===== CSS VARIABLES ===== */
:root {
  --bg: #0f172a;
  --card: #0b1220;
  --p1-accent: #10b981;
  --p2-accent: #f97316;
  --muted: #94a3b8;
  --primary-green: #00EA98;
  --primary-green-hover: #00d689;
  --player-blue: #3B82F6;
  --computer-yellow: #EAB308;
  --canvas-border: rgba(34, 197, 94, 0.3);
}

/* ===== BASE STYLES ===== */
html,
body {
  height: 100%;
  margin: 0;
  font-family: Inter, system-ui, Segoe UI, Roboto, Arial;
  touch-action: manipulation;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

body {
  background: linear-gradient(180deg, #041738 0%, #052045 50%, #062A5A 100%);
  color: #e6eef8;
  min-height: 100vh;
}

.hidden {
  display: none !important;
}

/* ===== WELCOME SCREEN ===== */
.welcome-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-y: auto;
  padding: 20px;
  box-sizing: border-box;
}

.welcome-content {
  background: transparent;
  border-radius: 20px;
  padding: 40px;
  max-width: 600px;
  width: 100%;
  text-align: center;
}

.app-logo {
  font-family: 'Orbitron', monospace;
  font-weight: 900;
  font-size: clamp(32px, 12vw, 52px);
  letter-spacing: 1.5px;
  color: var(--primary-green);
  text-transform: uppercase;
  margin: 0 0 40px 0;
  text-align: center;
  text-shadow: 
    0 0 12px rgba(0, 234, 152, 0.3),
    0 0 16px rgba(0, 234, 152, 0.2),
    0 0 5px rgba(0, 234, 152, 0.08);
}

.welcome-content h2 {
  margin: 0 0 30px 0;
  font-size: 36px;
  color: #ffffff;
  font-weight: 700;
  text-shadow: 0 2px 10px rgba(0, 234, 152, 0.3);
}

.welcome-content p {
  margin: 0 0 16px 0;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.8);
}

.welcome-content .rules {
  text-align: left;
  margin: 30px 0;
  padding: 24px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.welcome-content .rules h3 {
  margin: 0 0 16px 0;
  color: var(--computer-yellow);
  font-size: 20px;
  font-weight: 600;
}

.welcome-content .rules ul {
  margin: 0;
  padding-left: 24px;
  color: rgba(255, 255, 255, 0.9);
}

.welcome-content .rules li {
  margin: 12px 0;
  line-height: 1.6;
}

/* ===== GRID SELECTOR ===== */
.grid-selector {
  margin: 24px 0;
}

.grid-selector-label {
  margin-bottom: 16px;
  color: rgba(255, 255, 255, 0.9);
  font-weight: 500;
}

.grid-chips {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.grid-chip {
  background: rgba(10, 46, 92, 0.8);
  border: 3px solid rgba(26, 74, 127, 0.6);
  color: var(--primary-green);
  padding: 14px 22px;
  border-radius: 18px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: all 0.3s ease;
  min-width: 110px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 3px rgba(0, 0, 0, 0.15);
}

.grid-chip::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at 50% 50%,
    rgba(0, 234, 152, 0.05) 0%,
    rgba(0, 234, 152, 0.02) 40%,
    transparent 100%
  );
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.grid-chip:hover {
  transform: translateY(-2px);
}

.grid-chip.selected {
  border: 4px solid var(--primary-green);
  box-shadow:
    0 0 6px rgba(0, 234, 152, 0.15),
    0 0 4px rgba(0, 234, 152, 0.10),
    0 0 3px rgba(0, 0, 0, 0.15);
}

.grid-chip.selected::before {
  opacity: 1;
}

/* ===== BUTTONS ===== */
.welcome-buttons,
.popup-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 32px;
}

.welcome-btn,
.popup-btn {
  background: transparent;
  border: 1.5px solid rgba(148, 163, 184, 0.6);
  color: var(--muted);
  padding: 12px 20px;
  border-radius: clamp(6px, 8px, 16px);
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  transition: all 0.3s ease;
  min-width: 36px;
  min-height: 36px;
}

.welcome-btn:hover,
.popup-btn:hover {
  background: rgba(148, 163, 184, 0.15);
  border-color: rgba(148, 163, 184, 0.8);
  transform: translateY(-1px);
}

.welcome-btn.primary,
.popup-btn.primary {
  background: var(--primary-green);
  color: #041738;
  border: none;
  font-weight: 700;
  letter-spacing: 1.2px;
  padding: clamp(6px, 14px, 14px) clamp(20px, 24px, 24px);
  border-radius: clamp(6px, 8px, 8px);
  box-shadow: 
    0 0 10px rgba(0, 234, 152, 0.25),
    0 0 5px rgba(0, 234, 152, 0.08),
    0 4px 12px rgba(0, 234, 152, 0.4);
}

.welcome-btn.primary:hover,
.popup-btn.primary:hover {
  background: var(--primary-green-hover);
  box-shadow: 
    0 0 12px rgba(0, 234, 152, 0.3),
    0 0 6px rgba(0, 234, 152, 0.1),
    0 6px 16px rgba(0, 234, 152, 0.5);
  transform: translateY(-2px);
}

.welcome-btn.secondary,
.popup-btn.secondary {
  background: rgba(148, 163, 184, 0.1);
  border: 1.5px solid rgba(148, 163, 184, 0.6);
  border-radius: clamp(6px, 8px, 8px);
  padding: clamp(4px, 6px, 6px) clamp(12px, 14px, 14px);
  min-width: 40px;
  min-height: 40px;
}

.welcome-btn.secondary:hover,
.popup-btn.secondary:hover {
  background: rgba(148, 163, 184, 0.15);
  border-color: rgba(148, 163, 184, 0.8);
  color: var(--p1-accent);
}

.popup-buttons {
  margin-top: 24px;
}

/* ===== POPUP ===== */
.popup-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  box-sizing: border-box;
}

.popup {
  background: linear-gradient(135deg, #0A2E5C, #052045);
  border-radius: 16px;
  padding: 32px;
  max-width: 500px;
  width: 100%;
  text-align: left;
  border: 2px solid var(--primary-green);
  box-shadow: 
    0 0 20px rgba(0, 234, 152, 0.3),
    0 0 2px rgba(0, 234, 152, 0.3),
    0 30px 30px rgba(0, 0, 0, 0.5);
  position: relative;
  max-height: 90vh;
  overflow-y: auto;
}

.popup-close-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  background: #041738;
  border: 1.5px solid var(--primary-green);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--primary-green);
  z-index: 10;
}

.popup-close-btn:hover {
  background: rgba(0, 234, 152, 0.1);
  transform: scale(1.05);
}

.popup-close-btn svg {
  width: 18px;
  height: 18px;
}

.popup h2 {
  margin: 0px;
  font-size: clamp(24px, 5vw, 28px);
  color: var(--p1-accent);
  font-weight: 700;
  text-align: center;
}

/* Game Over popup specific */
.popup--game-over {
  max-width: 400px;
  padding: 20px;
  text-align: center;
}

.game-over-icon {
  display: block;
  font-size: 5.5rem;
  line-height: 1;
  margin: 0 0 2px 0;
  text-align: center;
}

.popup--game-over .game-over-icon + h2 {
  margin-top: 0;
}

.game-over-description {
  text-align: center;
}

/* Game Over popup buttons - same width and border-radius */
.popup--game-over .popup-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.popup--game-over .popup-btn {
  flex: 1;
  border-radius: 8px;
  min-width: 100px;
}

.popup--game-over .popup-btn.primary {
  border-radius: 8px;
}

.popup-section {
  margin-bottom: 20px;
}

.popup-section-header {
  font-size: clamp(16px, 3.5vw, 18px);
  color: var(--p1-accent);
  font-weight: 700;
  margin: 0 0 12px 0;
}

.popup-section-content {
  font-size: clamp(12px, 2.5vw, 14px);
  color: var(--muted);
  line-height: 1.4;
  margin: 0;
}

.popup-rules-list {
  margin: 0;
  padding-left: 20px;
  list-style: decimal;
  color: var(--muted);
}

.popup-rules-list li {
  margin: 6px 0;
  line-height: 1.4;
  font-size: clamp(12px, 2.5vw, 14px);
}

/* ===== GAME CONTAINER ===== */
.game-container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  overflow: hidden;
}

.particles-canvas {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  z-index: 0;
  pointer-events: none;
  display: block !important;
}

.game-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100vh;
  padding: 0 20px;
  box-sizing: border-box;
}

/* ===== CONTROLS ===== */
.left-controls,
.right-controls {
  position: absolute;
  top: 10px;
  z-index: 10;
  display: flex;
  flex-direction: row;
  gap: 8px;
  align-items: center;
}

.left-controls {
  left: 10px;
}

.right-controls {
  right: 10px;
}

.top-center-controls {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  flex-direction: row;
  gap: 12px;
  align-items: center;
  justify-content: center;
}

.home-button {
  background: rgba(148, 163, 184, 0.1);
  border: 1.5px solid rgba(148, 163, 184, 0.6);
  border-radius: clamp(6px, 8px, 8px);
  padding: clamp(4px, 6px, 6px);
  width: clamp(36px, 40px, 40px);
  height: clamp(36px, 40px, 40px);
  min-width: clamp(36px, 40px, 40px);
  min-height: clamp(36px, 40px, 40px);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 500;
  font-size: 10px;
  white-space: nowrap;
  box-sizing: border-box;
}

.home-button span {
  display: none;
}

.home-button svg {
  width: clamp(16px, 18px, 18px);
  height: clamp(16px, 18px, 18px);
  transition: all 0.3s ease;
  color: inherit;
}

.home-button:hover {
  transform: translateY(-1px);
  background: rgba(148, 163, 184, 0.15);
}

.home-button:hover svg {
  transform: scale(1.1);
}

#soundBtn.sound-enabled svg,
#howToPlayBtn.sound-enabled svg {
  color: var(--p1-accent);
}

#soundBtn.sound-disabled svg,
#howToPlayBtn.sound-disabled svg {
  color: var(--muted);
}

#homeBtn svg {
  color: var(--primary-green);
}

#homeBtn:hover svg {
  color: var(--primary-green-hover);
}

#resetBtn svg {
  color: var(--primary-green);
}

#resetBtn:hover svg {
  color: var(--primary-green-hover);
}

#resetBtn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

#resetBtn:disabled:hover {
  transform: none;
  background: rgba(148, 163, 184, 0.1);
}

#resetBtn:disabled svg {
  color: rgba(0, 234, 152, 0.5);
}

/* Game mode display - no styles needed, just text */

.game-mode-value {
  font-size: 14px;
  font-weight: 700;
  color: var(--primary-green);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ===== SCORE DISPLAY ===== */
.score-item {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.1),
    rgba(255, 255, 255, 0.05)
  );
  border-radius: 12px;
  padding: 10px 14px;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(15px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2), 0 2px 8px rgba(0, 0, 0, 0.1);
  position: relative;
  overflow: hidden;
  min-width: 60px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.score-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--p1-accent);
  opacity: 0.8;
}

.score-item.computer::before {
  background: var(--p2-accent);
}

.score-value {
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 2px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  text-align: center;
  width: 100%;
}

.score-label {
  font-size: 9px;
  color: rgba(255, 255, 255, 0.7);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  font-weight: 500;
  text-align: center;
  width: 100%;
}

.turn-display {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.1),
    rgba(255, 255, 255, 0.05)
  );
  border-radius: 12px;
  padding: 10px 14px;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(15px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2), 0 2px 8px rgba(0, 0, 0, 0.1);
  position: relative;
  overflow: hidden;
  min-width: 110px;
  width: 110px;
  box-sizing: border-box;
}

.turn-display::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--player-blue), var(--computer-yellow));
  opacity: 0.8;
}

.turn-text {
  font-size: 10px;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 2px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  font-weight: 500;
}

.turn-player {
  font-size: 16px;
  font-weight: 700;
  color: #ffffff;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.turn-player.player {
  color: var(--player-blue);
}

.turn-player.computer {
  color: var(--computer-yellow);
}

/* ===== GAME BOARD ===== */
.game-board {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
  padding: 2px;
  border-radius: 20px;
  background: linear-gradient(135deg, #041738, #052045, #062A5A);
  border: 1px solid var(--canvas-border);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  aspect-ratio: 1 / 1;
  width: 480px;
  max-height: 90vh;
}

#boardCanvas {
  display: block !important;
  position: relative;
  z-index: 1;
  border-radius: 16px;
  background: transparent;
  border: none;
  touch-action: manipulation;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  cursor: pointer;
  aspect-ratio: 1 / 1;
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (min-width: 1200px) {
  .left-controls {
    top: 15px;
    left: 15px;
    gap: 10px;
  }

  .top-center-controls {
    top: 15px;
    gap: 16px;
  }

  .right-controls {
    top: 15px;
    right: 15px;
  }

  .game-mode-value {
    font-size: 16px;
  }

  .score-item {
    padding: 12px 16px;
    min-width: 70px;
  }

  .score-value {
    font-size: 24px;
  }

  .score-label {
    font-size: 11px;
  }

  .turn-display {
    padding: 12px 16px;
    min-width: 120px;
    width: 120px;
  }

  .turn-player {
    font-size: 18px;
  }

  .game-board {
    width: 480px;
  }
}

@media (min-width: 768px) and (max-width: 1199px) {
  .left-controls {
    top: 12px;
    left: 12px;
  }

  .top-center-controls {
    top: 12px;
    gap: 14px;
  }

  .right-controls {
    top: 12px;
    right: 12px;
  }

  .game-mode-value {
    font-size: 14px;
  }

  .score-item {
    padding: 10px 14px;
    min-width: 65px;
  }

  .score-value {
    font-size: 22px;
  }

  .score-label {
    font-size: 10px;
  }

  .turn-display {
    padding: 10px 14px;
    min-width: 115px;
    width: 115px;
  }

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

  .game-board {
    width: 400px;
  }
}

@media (min-width: 481px) and (max-width: 767px) {
  .left-controls {
    top: 10px;
    left: 10px;
    gap: 6px;
  }

  .top-center-controls {
    top: 60px;
    gap: 10px;
  }

  .right-controls {
    top: 10px;
    right: 10px;
  }

  .game-mode-value {
    font-size: 12px;
  }

  .score-item {
    padding: 8px 12px;
    min-width: 55px;
  }

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

  .score-label {
    font-size: 9px;
  }

  .turn-display {
    padding: 8px 12px;
    min-width: 105px;
    width: 105px;
  }

  .turn-player {
    font-size: 14px;
  }

  .game-board {
    width: 90vw;
  }
}

/* Mobile: Move score/turn to next row */
@media (max-width: 767px) {
  .top-center-controls {
    top: 60px;
  }
}

@media (max-width: 480px) {
  .welcome-content {
    padding: 24px;
    max-width: 100%;
  }

  .welcome-content h2 {
    font-size: 28px;
    margin-bottom: 20px;
  }

  .welcome-content .rules {
    padding: 16px;
    margin: 20px 0;
  }

  .welcome-content .rules h3 {
    font-size: 18px;
  }

  .welcome-btn {
    padding: 12px 24px;
    font-size: 16px;
  }

  .game-content {
    padding: 0 10px;
  }

  .left-controls {
    top: 8px;
    left: 8px;
    gap: 6px;
  }

  .top-center-controls {
    top: 58px;
    gap: 8px;
  }

  .right-controls {
    top: 8px;
    right: 8px;
  }

  .game-mode-value {
    font-size: 11px;
  }

  .score-item {
    padding: 6px 8px;
    min-width: 40px;
  }

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

  .score-label {
    font-size: 7px;
  }

  .turn-display {
    padding: 6px 8px;
    min-width: 100px;
    width: 100px;
  }

  .turn-player {
    font-size: 12px;
  }

  .game-board {
    width: 90vw;
  }

  .popup {
    padding: 24px 20px;
    max-height: 85vh;
  }

  .popup-close-btn {
    width: 28px;
    height: 28px;
    top: 8px;
    right: 8px;
  }

  .popup-close-btn svg {
    width: 16px;
    height: 16px;
  }
}

@media (max-width: 320px) {
  .game-content {
    padding: 0 5px;
  }

  .left-controls {
    top: 5px;
    left: 5px;
    gap: 4px;
  }

  .top-center-controls {
    top: 55px;
    gap: 6px;
  }

  .right-controls {
    top: 5px;
    right: 5px;
  }

  .home-button {
    padding: 2px;
  }

  .home-button svg {
    width: 16px;
    height: 16px;
  }

  .game-mode-value {
    font-size: 10px;
  }

  .score-item {
    padding: 5px 7px;
    min-width: 35px;
  }

  .score-value {
    font-size: 14px;
  }

  .score-label {
    font-size: 6px;
  }

  .turn-display {
    padding: 5px 7px;
    min-width: 90px;
    width: 90px;
  }

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

  .game-board {
    width: 95vw;
  }
}

@media (orientation: landscape) and (max-height: 500px) {
  .left-controls {
    top: 5px;
    left: 5px;
    gap: 4px;
  }

  .top-center-controls {
    top: 55px;
    gap: 6px;
  }

  .right-controls {
    top: 5px;
    right: 5px;
  }

  .home-button {
    padding: 2px;
  }

  .home-button svg {
    width: 16px;
    height: 16px;
  }

  .game-mode-value {
    font-size: 11px;
  }

  .score-item {
    padding: 5px 8px;
    min-width: 40px;
  }

  .score-value {
    font-size: 14px;
  }

  .turn-display {
    padding: 5px 8px;
    min-width: 95px;
    width: 95px;
  }

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

  .game-board {
    width: 60vh;
  }
}

@media (min-width: 768px) and (max-width: 1024px) and (orientation: portrait) {
  .game-board {
    width: 70vw;
  }
}

@media (min-width: 768px) and (max-width: 1024px) and (orientation: landscape) {
  .game-board {
    width: 50vh;
  }
}

canvas {
  width: 100% !important;
  height: 100% !important;
}