/* ===== 2048 GAME - UNIFIED DESKTOP/MOBILE UX STYLESHEET ===== */
/* Consistent User Experience Across All Devices */

/* ===== CSS RESET & GLOBAL STYLES ===== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ===== CSS VARIABLES - UNIFIED VALUES ===== */
:root {
  /* Official 2048 Color Palette */
  --color-bg-main: #faf8ef;
  --color-bg-grid: #bbada0;
  --color-text-primary: #776e65;
  --color-text-dark: #f9f6f2;
  --color-button-primary: #8f7a66;
  --color-button-hover: #9f8a76;
  --color-border-light: #e8e0d6;
  --color-border-dark: #bbada0;
  --color-accent-gold: #edc22e;
  --color-accent-green: #4CAF50;
  --color-accent-blue: #2196F3;
  --color-accent-red: #f44336;
  --color-shadow: rgba(119, 110, 101, 0.35);
  
  /* Legacy variables for backward compatibility */
  --bg-color: var(--color-bg-main);
  --text-color: var(--color-text-primary);
  --grid-bg-color: var(--color-bg-grid);
  --grid-cell-color: rgba(238, 228, 218, 0.35);
  --button-bg: var(--color-button-primary);
  --button-text: var(--color-text-dark);
  --score-bg: var(--color-bg-grid);
  
  /* Dark Theme Colors */
  --color-dark-bg-main: #1a1a1a;
  --color-dark-bg-secondary: #2c2c2c;
  --color-dark-text: #f0f0f0;
  --color-dark-border: #444;
  --color-dark-button: #bbada0;
  
  /* UNIFIED DIMENSIONS - Same across all devices */
  --tile-size: clamp(70px, 15vw, 85px);
  --tile-gap: clamp(8px, 2vw, 12px);
  --font-size-tile: clamp(32px, 7vw, 44px);
  --font-size-tile-small: clamp(28px, 6vw, 36px);
  --font-size-tile-smallest: clamp(22px, 5vw, 28px);
  --font-size-tile-tiny: clamp(18px, 4vw, 24px);
  
  /* UNIFIED TYPOGRAPHY */
  --font-size-logo: clamp(40px, 8vw, 60px);
  --font-size-button: 14px;
  --font-size-score-label: 12px;
  --font-size-score-value: clamp(18px, 4vw, 20px);
  --font-size-mode-title: 14px;
  --font-size-timer: 13px;
  --font-size-mode-btn: 11px;
  
  /* UNIFIED SPACING */
  --spacing-xs: 6px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 20px;
  --spacing-xxl: 24px;
  
  /* UNIFIED PADDING */
  --padding-button: 10px 14px;
  --padding-score-box: 8px 16px;
  --padding-modal: var(--spacing-xxl);
  --padding-card: var(--spacing-lg);
  
  /* Animation variables */
  --tile-transition: all 0.15s ease-in-out;
  --button-transition: all 0.2s ease;
}

/* ===== BODY & GLOBAL STYLES ===== */
body {
  font-family: 'Clear Sans', 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
  display: flex;
  justify-content: center;
  padding: var(--spacing-xl) var(--spacing-md);
  transition: all 0.3s ease;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Theme overrides */
body.theme-dark {
  --bg-color: var(--color-dark-bg-main);
  --text-color: var(--color-dark-text);
  --grid-bg-color: var(--color-dark-bg-secondary);
  --grid-cell-color: rgba(68, 68, 68, 0.35);
  --score-bg: var(--color-dark-bg-secondary);
  --color-bg-main: var(--color-dark-bg-main);
  --color-text-primary: var(--color-dark-text);
  --color-border-light: var(--color-dark-border);
  --color-border-dark: #555;
  --color-button-primary: var(--color-dark-button);
  --color-button-hover: #ccbbaa;
}

/* SEO Hidden Content */
.seo-hidden {
  position: absolute !important;
  left: -10000px !important;
  top: auto !important;
  width: 1px !important;
  height: 1px !important;
  overflow: hidden !important;
}

/* ===== LAYOUT - UNIFIED STRUCTURE ===== */
.main-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl);
  width: 100%;
}

.game-wrapper {
  width: min(400px, 100%);
  margin-bottom: var(--spacing-xl);
}

/* ===== HEADER - UNIFIED ===== */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.logo {
  font-size: var(--font-size-logo);
  font-weight: bold;
  color: var(--color-text-primary);
  margin: 0;
}

/* ===== SCORES - UNIFIED ===== */
.score-wrapper {
  display: flex;
  justify-content: center;
  width: 100%;
}

.scores {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.score-box {
  background-color: #f3f1e8;
  color: #7e7465; 
  padding: var(--padding-score-box);
  border-radius: 10px; 
  text-align: center;
  font-family: 'Clear Sans', 'Helvetica Neue', Arial, sans-serif;
  min-width: 80px;
  border: 2px solid #eae6d9; 
  box-shadow: none;
  transition: all 0.2s ease-in-out;
}

.score-label {
  font-size: var(--font-size-score-label);
  font-weight: 600;
  color: #a09889;
  margin-bottom: 2px;
}

.score-value {
  font-size: var(--font-size-score-value);
  font-weight: 700;
  color: #7e7465;
}

/* ===== MODE DISPLAY - UNIFIED LAYOUT ===== */
.mode-section {
  margin: var(--spacing-md) 0;
  text-align: center;
}

.mode-display {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid rgba(187, 173, 160, 0.3);
  margin-bottom: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.mode-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex: 1;
  min-width: 0;
}

.mode-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  flex-shrink: 0;
}

.mode-title-compact {
  font-size: var(--font-size-mode-title);
  font-weight: bold;
  color: var(--text-color, #776e65);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  white-space: nowrap;
}

.mode-title-compact i {
  width: 14px;
  height: 14px;
}

.timer-compact {
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(143, 122, 102, 0.15);
  padding: 4px var(--spacing-sm);
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-weight: 600;
  font-size: var(--font-size-timer);
  color: var(--button-bg, #8f7a66);
  white-space: nowrap;
}

.timer-compact i {
  width: 12px;
  height: 12px;
}

.timer-compact.timer-warning {
  background: rgba(255, 153, 0, 0.2);
  color: #ff9900;
}

.timer-compact.timer-critical {
  background: rgba(255, 68, 68, 0.2);
  color: #ff4444;
  animation: pulse 1s infinite;
}

.mode-btn {
  background: #8f7a66;
  color: white;
  border: none;
  padding: 6px var(--spacing-sm);
  border-radius: 4px;
  cursor: pointer;
  font-size: var(--font-size-mode-btn);
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 3px;
  white-space: nowrap;
  min-height: 32px;
}

.mode-btn:hover {
  background: #9f8a76;
  transform: translateY(-1px);
}

.mode-btn i {
  width: 12px;
  height: 12px;
}

/* ===== GAME CONTAINER - UNIFIED ===== */
.game-container {
  position: relative;
  background: var(--grid-bg-color);
  border-radius: 6px;
  padding: var(--tile-gap);
  width: 100%;
  aspect-ratio: 1 / 1;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  transition: all 0.3s ease;
  overflow: hidden;
  touch-action: manipulation;
}

.game-container:hover {
  box-shadow: 0 0 15px rgba(0,0,0,0.15);
}

/* ===== GRID SYSTEM - UNIFIED ===== */
.grid-container {
  position: absolute;
  top: var(--tile-gap);
  left: var(--tile-gap);  
  width: calc(100% - calc(var(--tile-gap) * 2));
  height: calc(100% - calc(var(--tile-gap) * 2));
  z-index: 1;
  overflow: hidden;
}

.tile-container {
  position: absolute;
  top: var(--tile-gap);
  left: var(--tile-gap);
  width: calc(100% - calc(var(--tile-gap) * 2));
  height: calc(100% - calc(var(--tile-gap) * 2));
  z-index: 2;
  overflow: hidden;
}

.grid-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--tile-gap);
}

.grid-row:last-child {
  margin-bottom: 0;
}

.grid-cell {
  width: var(--tile-size);
  height: var(--tile-size);
  background: var(--grid-cell-color);
  border-radius: 6px;
  transition: background 0.3s ease;
}

.grid-cell:hover {
  background: rgba(238, 228, 218, 0.5);
  transform: scale(1.02);
}

.theme-dark .grid-cell:hover {
  background: rgba(68, 68, 68, 0.5);
}

/* ===== TILES - UNIFIED SIZING ===== */
.tile {
  position: absolute;
  width: var(--tile-size);
  height: var(--tile-size);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-tile);
  font-weight: bold;
  color: #776e65;
  transition: var(--tile-transition);
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  user-select: none;
  line-height: 1;
  will-change: transform;
}

.tile:hover {
  box-shadow: 0 3px 6px rgba(0,0,0,0.12);
  transform: translateY(-0.5px);
}

.tile.tile-new {
  animation: tileAppear 200ms ease 100ms;
  animation-fill-mode: backwards;
}

.tile.tile-merged {
  animation: tileMerge 200ms ease;
}

/* ===== TILE COLORS & FONT SIZES - UNIFIED ===== */
.tile-2    { background: #eee4da; color: #776e65; }
.tile-4    { background: #ede0c8; color: #776e65; }
.tile-8    { background: #f2b179; color: #f9f6f2; }
.tile-16   { background: #f59563; color: #f9f6f2; }
.tile-32   { background: #f67c5f; color: #f9f6f2; }
.tile-64   { background: #f65e3b; color: #f9f6f2; }
.tile-128  { background: #edcf72; color: #f9f6f2; font-size: var(--font-size-tile-small); }
.tile-256  { background: #edcc61; color: #f9f6f2; font-size: var(--font-size-tile-small); }
.tile-512  { background: #edc850; color: #f9f6f2; font-size: var(--font-size-tile-small); }
.tile-1024 { background: #edc53f; color: #f9f6f2; font-size: var(--font-size-tile-smallest); }
.tile-2048 { background: #edc22e; color: #f9f6f2; font-size: var(--font-size-tile-smallest); box-shadow: 0 0 20px rgba(237, 194, 46, 0.3); }
.tile-super { background: #3c3a32; color: #f9f6f2; font-size: var(--font-size-tile-tiny); }

/* Dark theme tile colors */
.theme-dark .tile-2    { background: #3c3c3c; color: #f0f0f0; }
.theme-dark .tile-4    { background: #4a4a4a; color: #f0f0f0; }
.theme-dark .tile-8    { background: #ff6b35; color: #f9f6f2; }
.theme-dark .tile-16   { background: #f7931e; color: #f9f6f2; }
.theme-dark .tile-32   { background: #ffb700; color: #f9f6f2; }
.theme-dark .tile-64   { background: #c1272d; color: #f9f6f2; }
.theme-dark .tile-128  { background: #662d91; color: #f9f6f2; }
.theme-dark .tile-256  { background: #2e3192; color: #f9f6f2; }
.theme-dark .tile-512  { background: #0072ce; color: #f9f6f2; }
.theme-dark .tile-1024 { background: #00a651; color: #f9f6f2; }
.theme-dark .tile-2048 { background: #ffd700; color: #2c2c2c; box-shadow: 0 0 20px rgba(255, 215, 0, 0.4); }
.theme-dark .tile-super { background: #ff1493; color: #f9f6f2; }

/* ===== MESSAGE OVERLAY - UNIFIED ===== */
.message {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 3;
  width: 100%;
  height: 100%;
  background: rgba(238, 228, 218, 0.85);
  border-radius: 6px;
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  backdrop-filter: blur(2px);
  gap: var(--spacing-lg);
}

.theme-dark .message {
  background: rgba(44, 44, 44, 0.9);
}

.message.win {
  background: rgba(237, 194, 46, 0.9);
}

.message.lose {
  background: rgba(255, 87, 87, 0.9);
}

.message h1 {
  font-size: clamp(28px, 6vw, 38px);
  margin-bottom: var(--spacing-xl);
  color: var(--text-color);
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
  text-align: center;
}

.message button {
  background: var(--button-bg);
  color: var(--button-text);
  border: none;
  padding: var(--padding-button);
  margin: 5px;
  border-radius: 6px;
  font-size: var(--font-size-button);
  font-weight: 600;
  cursor: pointer;
  transition: var(--button-transition);
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  min-height: 44px;
}

.message button:hover {
  background: #9f8a76;
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.message button:active {
  transform: translateY(0);
}

/* ===== CONTROLS - UNIFIED LAYOUT ===== */
.controls {
  margin-top: var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.controls-left,
.controls-right {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.btn {
  background: var(--button-bg);
  color: var(--button-text);
  border: none;
  padding: var(--padding-button);
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--button-transition);
  font-size: var(--font-size-button);
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.btn:hover {
  background: #9f8a76;
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

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

.btn.small {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-button);
  min-width: 36px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

.btn:focus {
  outline: 2px solid var(--button-bg);
  outline-offset: 2px;
}

/* ===== SEO CONTENT - UNIFIED ===== */
.seo-content {
  background: rgba(255, 255, 255, 0.8);
  border-radius: 12px;
  padding: var(--spacing-xxl);
  margin: var(--spacing-xl) 0;
  text-align: left;
  line-height: 1.6;
  color: #776e65;
  width: 100%;
  max-width: 800px;
  margin-top: 0;
}

.seo-content h2 {
  color: #8f7a66;
  margin-bottom: var(--spacing-lg);
  font-size: clamp(20px, 4vw, 24px);
}

.seo-content h3 {
  color: #8f7a66;
  margin: var(--spacing-xl) 0 var(--spacing-md) 0;
  font-size: clamp(16px, 3vw, 18px);
}

.seo-content p {
  margin-bottom: var(--spacing-lg);
}

.seo-content ul {
  margin: var(--spacing-lg) 0;
  padding-left: 25px;
}

.seo-content li {
  margin-bottom: var(--spacing-sm);
}

/* ===== MODAL COMPONENTS - UNIFIED STYLES ===== */

/* Base Modal Styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(119, 110, 101, 0.8);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 1;
}

.modal-container {
  background: var(--color-bg-main);
  border-radius: 12px;
  box-shadow: 0 20px 40px var(--color-shadow);
  width: min(90vw, 600px);
  max-height: 90vh;
  overflow: hidden;
  position: relative;
  border: 2px solid var(--color-border-dark);
}

.modal-header {
  background: var(--color-button-primary);
  color: var(--color-text-dark);
  padding: var(--spacing-xl) var(--padding-modal);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 3px solid var(--color-bg-grid);
}

.modal-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: clamp(16px, 3vw, 18px);
  font-weight: 700;
  margin: 0;
}

.modal-close {
  background: rgba(249, 246, 242, 0.2);
  border: none;
  color: var(--color-text-dark);
  width: 36px;
  height: 36px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: bold;
  transition: background-color 0.2s ease;
}

.modal-close:hover {
  background: rgba(249, 246, 242, 0.3);
}

.modal-content {
  padding: var(--padding-modal);
  overflow-y: auto;
  max-height: calc(90vh - 140px);
  color: var(--color-text-primary);
}

.modal-actions {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  padding: var(--spacing-xl) var(--padding-modal);
  background: var(--color-border-light);
  border-top: 1px solid var(--color-border-dark);
}

.modal-btn {
  background: var(--color-button-primary);
  color: var(--color-text-dark);
  border: none;
  padding: var(--padding-button);
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  font-size: var(--font-size-button);
  transition: background-color 0.2s ease;
  min-height: 44px;
}

.modal-btn:hover {
  background: var(--color-button-hover);
}

.modal-btn.secondary {
  background: transparent;
  color: var(--color-text-primary);
  border: 2px solid var(--color-button-primary);
}

.modal-btn.secondary:hover {
  background: var(--color-button-primary);
  color: var(--color-text-dark);
}

/* Mode Selector Modal - UNIFIED */
.mode-selector-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(119, 110, 101, 0.8);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
}

.mode-selector-modal {
  background: var(--color-bg-main);
  border-radius: 12px;
  padding: 0;
  box-shadow: 0 20px 40px var(--color-shadow);
  width: min(90vw, 500px);
  max-height: 90vh;
  overflow: hidden;
  border: 2px solid var(--color-border-dark);
}

.mode-selector-modal h2 {
  background: var(--color-button-primary);
  color: var(--color-text-dark);
  margin: 0;
  padding: var(--spacing-xl) var(--padding-modal);
  font-size: clamp(16px, 3vw, 18px);
  font-weight: 700;
  text-align: center;
  border-bottom: 3px solid var(--color-bg-grid);
}

.mode-options {
  padding: var(--padding-modal);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.mode-option-btn {
  background: var(--color-bg-main);
  border: 2px solid var(--color-border-light);
  border-radius: 8px;
  padding: var(--spacing-xl);
  cursor: pointer;
  text-align: left;
  color: var(--color-text-primary);
  transition: all 0.2s ease;
  position: relative;
  min-height: 70px;
}

.mode-option-btn:hover {
  border-color: var(--color-button-primary);
  background: rgba(143, 122, 102, 0.05);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(143, 122, 102, 0.2);
}

.mode-option-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: clamp(14px, 3vw, 16px);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-button-primary);
}

.mode-option-desc {
  font-size: var(--font-size-button);
  opacity: 0.8;
  line-height: 1.4;
}

.mode-selector-close {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--color-text-primary);
  padding: var(--spacing-lg);
  font-size: var(--font-size-button);
  font-weight: 600;
  cursor: pointer;
  border-top: 1px solid var(--color-border-light);
  transition: background-color 0.2s ease;
  min-height: 50px;
}

.mode-selector-close:hover {
  background: var(--color-border-light);
}

/* ===== SHARE MODAL - UNIFIED ===== */
.share-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(119, 110, 101, 0.8);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
}

.share-modal {
  background: var(--color-bg-main);
  border-radius: 12px;
  width: min(90vw, 500px);
  max-height: 90vh;
  overflow: hidden;
  border: 2px solid var(--color-border-dark);
  box-shadow: 0 20px 40px var(--color-shadow);
  display: flex;
  flex-direction: column;
}

.share-header {
  background: var(--color-button-primary);
  color: var(--color-text-dark);
  padding: var(--spacing-xl) var(--padding-modal);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 3px solid var(--color-bg-grid);
}

.share-header h3 {
  margin: 0;
  font-size: clamp(16px, 3vw, 18px);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.share-close {
  background: rgba(249, 246, 242, 0.2);
  border: none;
  color: var(--color-text-dark);
  width: 36px;
  height: 36px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: bold;
  transition: background-color 0.2s ease;
}

.share-close:hover {
  background: rgba(249, 246, 242, 0.3);
}

.share-content {
  padding: var(--padding-modal);
  overflow-y: auto;
  max-height: calc(90vh - 140px);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.share-preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--color-text-dark);
  border-radius: 8px;
  border: 2px solid var(--color-border-light);
}

.share-preview canvas {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(119, 110, 101, 0.2);
}

.preview-download-btn {
  background: var(--color-accent-blue);
  color: var(--color-text-dark);
  border: none;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  transition: all 0.2s ease;
}

.preview-download-btn:hover {
  background: #1976D2;
  transform: translateY(-1px);
}

.text-preview {
  text-align: center;
  padding: var(--spacing-xl);
  background: linear-gradient(135deg, var(--color-accent-blue), var(--color-accent-green));
  color: white;
  border-radius: 8px;
}

.preview-title {
  font-size: clamp(16px, 3vw, 18px);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.preview-score,
.preview-best {
  font-size: var(--font-size-button);
  margin-bottom: 4px;
  opacity: 0.9;
}

.share-text-container {
  position: relative;
  background: var(--color-text-dark);
  border-radius: 8px;
  border: 2px solid var(--color-border-light);
  overflow: hidden;
}

.share-text {
  padding: var(--spacing-lg);
  font-size: var(--font-size-button);
  line-height: 1.4;
  color: var(--color-text-primary);
  min-height: 60px;
  background: none;
  border: none;
  resize: none;
  width: 100%;
  box-sizing: border-box;
}

.edit-share-text {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  background: var(--color-button-primary);
  color: var(--color-text-dark);
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  opacity: 0.8;
  transition: all 0.2s ease;
}

.edit-share-text:hover {
  opacity: 1;
  transform: scale(1.1);
}

.share-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--spacing-md);
}

.share-btn {
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  font-weight: 600;
  font-size: 13px;
  transition: all 0.2s ease;
  text-decoration: none;
  color: white;
  position: relative;
  overflow: hidden;
  min-height: 48px;
}

.share-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}

.share-btn:hover::before {
  left: 100%;
}

.share-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

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

.share-btn.facebook {
  background: #1877f2;
}

.share-btn.facebook:hover {
  background: #166fe5;
}

.share-btn.twitter {
  background: #1da1f2;
}

.share-btn.twitter:hover {
  background: #1991db;
}

.share-btn.whatsapp {
  background: #25d366;
}

.share-btn.whatsapp:hover {
  background: #20bd5a;
}

.share-btn.copy {
  background: #6c757d;
}

.share-btn.copy:hover {
  background: #5a6268;
}

.share-btn.download {
  background: var(--color-accent-blue);
}

.share-btn.download:hover {
  background: #1976D2;
}

.share-btn.native {
  background: var(--color-button-primary);
  grid-column: 1 / -1;
}

.share-btn.native:hover {
  background: var(--color-button-hover);
}

/* Share Modal Dark Theme */
.theme-dark .share-modal {
  background: var(--color-dark-bg-main);
  color: var(--color-dark-text);
  border-color: var(--color-dark-border);
}

.theme-dark .share-preview,
.theme-dark .share-text-container {
  background: var(--color-dark-bg-secondary);
  border-color: var(--color-dark-border);
}

.theme-dark .share-text {
  color: var(--color-dark-text);
}

/* Help Modal - UNIFIED */
.help-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(119, 110, 101, 0.8);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
}

.help-modal {
  background: var(--color-bg-main);
  border-radius: 12px;
  width: min(90vw, 800px);
  max-height: 90vh;
  overflow: hidden;
  border: 2px solid var(--color-border-dark);
  box-shadow: 0 20px 40px var(--color-shadow);
  display: flex;
  flex-direction: column;
}

.help-header {
  background: var(--color-button-primary);
  color: var(--color-text-dark);
  padding: var(--spacing-xl) var(--padding-modal);
  text-align: center;
  position: relative;
  border-bottom: 3px solid var(--color-bg-grid);
}

.help-title {
  margin: 0 0 var(--spacing-sm) 0;
  font-size: clamp(18px, 4vw, 20px);
  font-weight: 700;
}

.help-subtitle {
  margin: 0;
  font-size: var(--font-size-button);
  opacity: 0.9;
}

.help-close {
  position: absolute;
  top: var(--spacing-lg);
  right: var(--spacing-xl);
  background: rgba(249, 246, 242, 0.2);
  border: none;
  color: var(--color-text-dark);
  width: 36px;
  height: 36px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 18px;
  font-weight: bold;
  transition: background-color 0.2s ease;
}

.help-close:hover {
  background: rgba(249, 246, 242, 0.3);
}

.help-tabs {
  display: flex;
  background: var(--color-border-light);
  border-bottom: 1px solid var(--color-border-dark);
}

.help-tab {
  flex: 1;
  padding: var(--spacing-md) var(--spacing-lg);
  background: none;
  border: none;
  color: var(--color-text-primary);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  min-height: 50px;
}

.help-tab:hover {
  background: rgba(143, 122, 102, 0.1);
}

.help-tab.active {
  background: var(--color-bg-main);
  color: var(--color-button-primary);
  border-bottom: 3px solid var(--color-button-primary);
}

.help-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--padding-modal);
}

.help-tab-content {
  display: none;
}

.help-tab-content.active {
  display: block;
}

.help-section-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--padding-modal);
  padding-bottom: var(--spacing-lg);
  border-bottom: 2px solid var(--color-border-light);
}

.help-section-icon {
  font-size: clamp(20px, 4vw, 24px);
}

.help-section-title {
  margin: 0;
  color: var(--color-button-primary);
  font-size: clamp(16px, 3vw, 18px);
  font-weight: 700;
}

.help-cards {
  display: grid;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.help-cards.two-cols {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.help-card {
  background: var(--color-text-dark);
  border-radius: 8px;
  padding: var(--spacing-xl);
  border: 2px solid var(--color-border-light);
  box-shadow: 0 4px 12px rgba(119, 110, 101, 0.1);
}

.help-card-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--color-border-light);
}

.help-card-icon {
  width: 36px;
  height: 36px;
  background: var(--color-button-primary);
  color: var(--color-text-dark);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.help-card-title {
  color: var(--color-button-primary);
  font-size: clamp(14px, 3vw, 16px);
  font-weight: 700;
  margin: 0;
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.feature-item:last-child {
  border-bottom: none;
}

.feature-icon {
  font-size: clamp(14px, 3vw, 16px);
  margin-top: 2px;
  flex-shrink: 0;
}

.feature-content {
  flex: 1;
}

.feature-title {
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 2px;
}

.feature-desc {
  font-size: 13px;
  color: var(--color-text-primary);
  opacity: 0.8;
}

/* Controls Grid - UNIFIED */
.controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.control-group {
  background: var(--color-text-dark);
  border-radius: 8px;
  padding: var(--spacing-xl);
  border: 2px solid var(--color-border-light);
}

.control-group-title {
  color: var(--color-button-primary);
  font-size: clamp(14px, 3vw, 16px);
  font-weight: 700;
  margin: 0 0 var(--spacing-lg) 0;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.control-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.control-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;  
  border-bottom: 1px solid var(--color-border-light);
}

.control-item:last-child {
  border-bottom: none;
}

.control-action {
  font-weight: 500;
  color: var(--color-text-primary);
  font-size: var(--font-size-button);
}

.control-keys {
  display: flex;
  gap: 4px;
  align-items: center;
}

.key-combo {
  background: var(--color-border-light);
  border: 1px solid var(--color-border-dark);
  border-radius: 4px;
  padding: 4px var(--spacing-sm);
  font-family: 'Courier New', monospace;
  font-size: 12px;
  font-weight: bold;
  color: var(--color-text-primary);
}

/* Tips Grid - UNIFIED */
.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-lg);
}

.tip-card {
  background: var(--color-text-dark);
  border-radius: 8px;
  padding: var(--spacing-lg);
  border: 2px solid var(--color-border-light);
  transition: all 0.2s ease;
}

.tip-card:hover {
  border-color: var(--color-button-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(143, 122, 102, 0.2);
}

.tip-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.tip-icon {
  font-size: clamp(16px, 3vw, 18px);
}

.tip-title {
  color: var(--color-button-primary);
  font-size: var(--font-size-button);
  font-weight: 600;
  margin: 0;
}

.tip-content {
  color: var(--color-text-primary);
  font-size: 13px;
  line-height: 1.4;
  margin: 0;
}

/* Achievement Grid - UNIFIED */
.achievement-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.achievement-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  background: var(--color-text-dark);
  border-radius: 8px;
  padding: var(--spacing-md) var(--spacing-lg);
  border: 2px solid var(--color-accent-gold);
  border-left-width: 4px;
}

.achievement-emoji {
  font-size: clamp(18px, 4vw, 20px);
  flex-shrink: 0;
}

.achievement-info {
  flex: 1;
}

.achievement-name {
  font-weight: 600;
  color: var(--color-button-primary);
  margin-bottom: 2px;
  font-size: var(--font-size-button);
}

.achievement-desc {
  font-size: 12px;
  color: var(--color-text-primary);
  opacity: 0.8;
}

.help-actions {
  padding: var(--spacing-xl) var(--padding-modal);
  background: var(--color-border-light);
  border-top: 1px solid var(--color-border-dark);
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
}

.help-btn {
  padding: var(--padding-button);
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  font-size: var(--font-size-button);
  transition: all 0.2s ease;
  border: none;
  min-height: 44px;
}

.help-btn-primary {
  background: var(--color-button-primary);
  color: var(--color-text-dark);
}

.help-btn-primary:hover {
  background: var(--color-button-hover);
}

.help-btn-secondary {
  background: transparent;
  color: var(--color-text-primary);
  border: 2px solid var(--color-button-primary);
}

.help-btn-secondary:hover {
  background: var(--color-button-primary);
  color: var(--color-text-dark);
}

/* ===== ACHIEVEMENT SYSTEM - UNIFIED ===== */
.achievement-notification {
  position: fixed;
  top: var(--spacing-xl);
  right: var(--spacing-xl);
  min-width: 300px;
  max-width: min(400px, calc(100vw - 40px));
  background: var(--color-button-primary);
  color: var(--color-text-dark);
  border-radius: 8px;
  padding: 0;
  font-weight: 600;
  z-index: 1001;
  border: 2px solid var(--color-bg-grid);
  box-shadow: 0 8px 24px var(--color-shadow);
}

.achievement-header {
  display: flex;
  align-items: center;
  padding: var(--spacing-lg);
  position: relative;
}

.achievement-icon {
  width: 36px;
  height: 36px;
  margin-right: var(--spacing-md);
  padding: var(--spacing-sm);
  border-radius: 6px;
  background: var(--color-text-dark);
  color: var(--color-button-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.achievement-content {
  flex: 1;
  min-width: 0;
}

.achievement-title {
  font-size: var(--font-size-button);
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--color-text-dark);
}

.achievement-description {
  font-size: 12px;
  line-height: 1.3;
  color: rgba(249, 246, 242, 0.9);
}

.achievement-rarity {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-md);
  font-size: 9px;
  font-weight: 600;
  padding: 2px var(--spacing-xs);
  border-radius: 4px;
  background: rgba(249, 246, 242, 0.2);
  color: var(--color-text-dark);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Achievement Rarity Colors - UNIFIED */
.achievement-notification.rarity-common {
  background: var(--color-button-primary);
}

.achievement-notification.rarity-uncommon {
  background: var(--color-accent-blue);
}

.achievement-notification.rarity-rare {
  background: var(--color-accent-green);
}

.achievement-notification.rarity-epic {
  background: #9C27B0;
}

.achievement-notification.rarity-legendary {
  background: var(--color-accent-gold);
  color: var(--color-text-primary);
}

.achievement-notification.rarity-legendary .achievement-icon {
  background: var(--color-text-primary);
  color: var(--color-accent-gold);
}

.achievement-notification.rarity-legendary .achievement-title,
.achievement-notification.rarity-legendary .achievement-description {
  color: var(--color-text-primary);
}

/* Achievement Gallery - UNIFIED */
.achievement-gallery {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--color-bg-main);
  border-radius: 12px;
  padding: 0;
  border: 2px solid var(--color-border-dark);
  z-index: 1001;
  width: min(90vw, 800px);
  max-height: 90vh;
  overflow: hidden;
  box-shadow: 0 20px 40px var(--color-shadow);
}

.achievement-gallery-header {
  background: var(--color-button-primary);
  color: var(--color-text-dark);
  padding: var(--spacing-xl) var(--padding-modal);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 3px solid var(--color-bg-grid);
}

.achievement-gallery-title {
  font-size: clamp(16px, 3vw, 18px);
  font-weight: 700;
  color: var(--color-text-dark);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.achievement-close {
  background: rgba(249, 246, 242, 0.2);
  border: none;
  color: var(--color-text-dark);
  width: 36px;
  height: 36px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: bold;
  transition: background-color 0.2s ease;
}

.achievement-close:hover {
  background: rgba(249, 246, 242, 0.3);
}

.achievement-gallery-content {
  padding: var(--padding-modal);
  overflow-y: auto;
  max-height: calc(90vh - 120px);
  background: var(--color-bg-main);
}

.achievement-stats {
  display: flex;
  gap: var(--spacing-lg);
  margin-bottom: var(--padding-modal);
  padding: var(--spacing-lg);
  background: var(--color-text-dark);
  border-radius: 8px;
  border: 2px solid var(--color-border-light);
  flex-wrap: wrap;
  justify-content: center;
}

.achievement-stat {
  text-align: center;
  flex: 1;
  min-width: 80px;
}

.achievement-stat-value {
  font-size: clamp(18px, 4vw, 20px);
  font-weight: 700;
  color: var(--color-button-primary);
  margin-bottom: 4px;
}

.achievement-stat-label {
  font-size: 11px;
  color: var(--color-text-primary);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.achievement-gallery .achievement-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.achievement-card {
  background: var(--color-text-dark);
  border-radius: 8px;
  padding: var(--spacing-lg);
  border: 2px solid var(--color-border-light);
  transition: all 0.2s ease;
}

.achievement-card.unlocked {
  border-color: var(--color-button-primary);
  background: var(--color-bg-main);
}

.achievement-card.locked {
  opacity: 0.6;
  background: var(--color-border-light);
}

.achievement-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(143, 122, 102, 0.2);
}

.achievement-card-header {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.achievement-card-icon {
  width: 36px;
  height: 36px;
  margin-right: var(--spacing-md);
  padding: var(--spacing-sm);
  border-radius: 6px;
  background: var(--color-button-primary);
  color: var(--color-text-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.achievement-card.locked .achievement-card-icon {
  background: var(--color-bg-grid);
  color: var(--color-text-primary);
  opacity: 0.6;
}

.achievement-card-info {
  flex: 1;
  min-width: 0;
}

.achievement-card-title {
  font-size: var(--font-size-button);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 2px;
}

.achievement-card.locked .achievement-card-title {
  color: var(--color-bg-grid);
}

.achievement-card-rarity {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-button-primary);
}

.achievement-card.locked .achievement-card-rarity {
  color: var(--color-bg-grid);
}

.achievement-card-description {
  font-size: 13px;
  color: var(--color-text-primary);
  line-height: 1.4;
}

.achievement-card.locked .achievement-card-description {
  color: var(--color-bg-grid);
}

.achievement-unlock-date {
  font-size: 10px;
  color: var(--color-button-primary);
  margin-top: var(--spacing-sm);
  font-weight: 500;
}

/* ===== STATISTICS PANEL - UNIFIED ===== */
.stats-panel {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--color-bg-main);
  border-radius: 12px;
  padding: 0;
  box-shadow: 0 20px 40px var(--color-shadow);
  z-index: 1001;
  width: min(90vw, 700px);
  max-height: 90vh;
  overflow: hidden;
  border: 2px solid var(--color-border-dark);
}

.stats-header {
  background: var(--color-button-primary);
  color: var(--color-text-dark);
  padding: var(--spacing-xl) var(--padding-modal);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 3px solid var(--color-bg-grid);
}

.stats-header h3 {
  margin: 0;
  font-size: clamp(16px, 3vw, 18px);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.close-stats {
  background: rgba(249, 246, 242, 0.2);
  border: none;
  color: var(--color-text-dark);
  width: 36px;
  height: 36px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: bold;
  transition: background-color 0.2s ease;
}

.close-stats:hover {
  background: rgba(249, 246, 242, 0.3);
}

.stats-content {
  padding: var(--padding-modal);
  overflow-y: auto;
  max-height: calc(90vh - 120px);
}

.stats-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: var(--padding-modal);
  background: var(--color-border-light);
  border-radius: 8px;
  padding: 4px;
}

.stats-tab {
  flex: 1;
  padding: var(--spacing-md) var(--spacing-lg);
  background: none;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  transition: all 0.2s ease;
  min-height: 44px;
}

.stats-tab:hover {
  background: rgba(143, 122, 102, 0.1);
}

.stats-tab.active {
  background: var(--color-button-primary);
  color: var(--color-text-dark);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--padding-modal);
}

.stat-card {
  background: var(--color-text-dark);
  border-radius: 8px;
  padding: var(--spacing-lg);
  text-align: center;
  border: 2px solid var(--color-border-light);
  cursor: pointer;
  transition: all 0.2s ease;
}

.stat-card:hover {
  border-color: var(--color-button-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(143, 122, 102, 0.2);
}

.stat-icon {
  font-size: clamp(20px, 4vw, 24px);
  margin-bottom: var(--spacing-sm);
  display: block;
  color: var(--color-button-primary);
}

.stat-value {
  font-size: clamp(18px, 4vw, 20px);
  font-weight: 700;
  color: var(--color-button-primary);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 11px;
  color: var(--color-text-primary);
  opacity: 0.8;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.mode-stats {
  margin-top: var(--padding-modal);
}

.mode-stats h4 {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: clamp(14px, 3vw, 16px);
  font-weight: 600;
}

.mode-stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-text-dark);
  border-radius: 6px;
  margin-bottom: var(--spacing-sm);
  border-left: 4px solid var(--color-button-primary);
  transition: all 0.2s ease;
}

.mode-stat-row:hover {
  background: rgba(143, 122, 102, 0.05);
  transform: translateX(4px);
}

.mode-stat-name {
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-text-primary);
  font-size: var(--font-size-button);
}

.mode-stat-values {
  display: flex;
  gap: var(--spacing-lg);
  font-size: var(--font-size-button);
  color: var(--color-text-primary);
}

.mode-stat-values span {
  color: var(--color-button-primary);
  font-weight: 600;
}

/* Continue Playing Button - UNIFIED */
.continue-playing-btn {
  background: var(--color-accent-green);
  color: var(--color-text-dark);
  border: none;
  padding: var(--padding-button);
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  font-size: var(--font-size-button);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  justify-content: center;
  margin: var(--spacing-md) auto 0;
  transition: all 0.2s ease;
  min-height: 44px;
}

.continue-playing-btn:hover {
  background: #45a049;
  transform: translateY(-1px);
}

/* ===== ENHANCED BUTTON ANIMATIONS - UNIFIED ===== */
.btn.animate-success {
  background: var(--color-accent-green) !important;
  transform: scale(1.05);
  animation: successPulse 0.6s ease-out;
}

.btn.animate-error {
  background: var(--color-accent-red) !important;
  transform: scale(1.05);
  animation: errorShake 0.6s ease-out;
}

@keyframes successPulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1.05); }
}

@keyframes errorShake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

/* ===== LOADING STATES - UNIFIED ===== */
.share-btn.loading {
  pointer-events: none;
  opacity: 0.7;
  position: relative;
}

.share-btn.loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* ===== ANIMATIONS - UNIFIED ===== */
/* Tile animations */
@keyframes tileAppear {
  0% {
    opacity: 0;
    transform: scale(0);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes tileMerge {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.7;
    transform: scale(1.05);
  }
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ===== DARK THEME OVERRIDES - UNIFIED ===== */
.theme-dark .mode-display {
  background: rgba(68, 68, 68, 0.3);
  border-color: rgba(255, 255, 255, 0.1);
}

.theme-dark .timer-compact {
  background: rgba(255, 255, 255, 0.1);
}

.theme-dark .daily-info {
  background: rgba(76, 175, 80, 0.2);
  border-color: rgba(76, 175, 80, 0.4);
}

.theme-dark .seo-content {
  background: rgba(68, 68, 68, 0.8);
  color: #f0f0f0;
}

.theme-dark .seo-content h2,
.theme-dark .seo-content h3 {
  color: #bbada0;
}

.theme-dark .modal-container,
.theme-dark .mode-selector-modal,
.theme-dark .stats-panel,
.theme-dark .achievement-gallery,
.theme-dark .help-modal {
  background: var(--color-dark-bg-main);
  color: var(--color-dark-text);
  border-color: var(--color-dark-border);
}

.theme-dark .help-card,
.theme-dark .achievement-card,
.theme-dark .stat-card,
.theme-dark .mode-stat-row,
.theme-dark .achievement-stats,
.theme-dark .control-group,
.theme-dark .tip-card {
  background: var(--color-dark-bg-secondary);
  border-color: var(--color-dark-border);
}

.theme-dark .key-combo {
  background: var(--color-dark-border);
  border-color: #666;
  color: var(--color-dark-text);
}

/* ===== ENHANCED ACCESSIBILITY - UNIFIED ===== */
.share-btn:focus,
.edit-share-text:focus,
.preview-download-btn:focus,
.btn:focus,
.modal-btn:focus,
.help-btn:focus {
  outline: 2px solid var(--color-accent-blue);
  outline-offset: 2px;
}

.theme-dark .share-btn:focus,
.theme-dark .edit-share-text:focus,
.theme-dark .preview-download-btn:focus,
.theme-dark .btn:focus,
.theme-dark .modal-btn:focus,
.theme-dark .help-btn:focus {
  outline-color: var(--color-accent-gold);
}

/* ===== TOOLTIP STYLES - UNIFIED ===== */
.share-btn[title] {
  position: relative;
}

.share-btn[title]:hover::before {
  content: attr(title);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: 4px var(--spacing-sm);
  border-radius: 4px;
  font-size: 11px;
  white-space: nowrap;
  z-index: 1001;
  margin-bottom: 4px;
}

/* ===== RESPONSIVE DESIGN - MOBILE ONLY FINE-TUNING ===== */
/* Remove most responsive breakpoints to maintain consistency */

@media (max-width: 480px) {
  /* Only adjust what's absolutely necessary for very small screens */
  .main-container {
    padding: var(--spacing-md);
  }
  
  .achievement-notification {
    top: var(--spacing-md);
    right: var(--spacing-md);
    left: var(--spacing-md);
    min-width: auto;
    max-width: none;
  }
  
  .achievement-stats {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }
  
  .mode-stat-values {
    flex-direction: column;
    gap: 4px;
    text-align: right;
    font-size: 12px;
  }
}

/* ===== TOUCH OPTIMIZATIONS - UNIFIED ===== */
@media (hover: none) and (pointer: coarse) {
  /* Ensure all interactive elements have adequate touch targets */
  .btn,
  .mode-btn,
  .modal-btn,
  .help-btn,
  .share-btn {
    min-height: 44px;
    min-width: 44px;
  }
  
  /* Prevent text selection during touch - but allow for reading content */
  * {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
  }
  
  /* Allow text selection for reading content */
  .seo-content,
  .help-content,
  .share-text,
  .achievement-description,
  .feature-desc,
  .tip-content {
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    user-select: text;
  }
}

/* ===== HIGH DPI DISPLAYS - UNIFIED ===== */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .tile,
  .grid-cell {
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
  }
}

/* ===== ACCESSIBILITY - UNIFIED ===== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-contrast: high) {
  .tile {
    border: 2px solid;
  }
  
  .grid-cell {
    border: 1px solid;
  }
}

/* ===== PERFORMANCE OPTIMIZATIONS - UNIFIED ===== */
.tile,
.grid-cell,
.btn {
  will-change: transform;
}

/* Force hardware acceleration */
.game-container,
.tile-container,
.grid-container {
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
}

/* ===== PRINT STYLES - UNIFIED ===== */
@media print {
  .controls,
  .mode-section,
  .share-overlay,
  .modal-overlay,
  .achievement-notification {
    display: none !important;
  }
  
  .game-wrapper {
    max-width: none;
    width: 100%;
  }
  
  body {
    background: white;
    color: black;
  }
}