:root { --color-bg: #1a1a1f; --color-surface: #232329; --color-border: #3a3a42; --color-text: #e8e8eb; --color-text-muted: #8a8a94; --color-primary: #6366f1; --color-primary-hover: #818cf8; --color-player-x: #6366f1; --color-player-o: #f59e0b; --space-2: 8px; --space-3: 12px; --space-4: 16px; --radius-sm: 4px; --radius-md: 8px; --radius-lg: 12px; --duration-fast: 100ms; --duration-normal: 200ms; --ease-out: cubic-bezier(0, 0, 0.2, 1); --ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275); } @media (prefers-color-scheme: light) { :root { --color-bg: #f8f9fa; --color-surface: #ffffff; --color-border: #e0e0e6; --color-text: #1a1a1f; --color-text-muted: #6b6b78; --color-primary: #5558e3; --color-primary-hover: #6366f1; --color-player-x: #5558e3; --color-player-o: #d97706; } } *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; } html, body { height: 100%; width: 100%; overflow: hidden; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background-color: var(--color-bg); color: var(--color-text); -webkit-font-smoothing: antialiased; } body { display: flex; align-items: center; justify-content: center; padding: var(--space-3); box-sizing: border-box; } .game-wrapper { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: var(--space-3); width: 100%; height: 100%; max-width: min(90vmin, 400px); max-height: 100%; animation: fadeIn var(--duration-normal) var(--ease-out); } @keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } } .board { display: grid; grid-template-columns: repeat(3, 1fr); grid-template-rows: repeat(3, 1fr); gap: clamp(4px, 1vmin, 8px); width: 100%; max-width: min(80vmin, 350px); aspect-ratio: 1 / 1; background-color: var(--color-border); padding: clamp(4px, 1vmin, 8px); border-radius: var(--radius-lg); flex-shrink: 0; } .cell { display: flex; align-items: center; justify-content: center; background-color: var(--color-surface); border: none; border-radius: var(--radius-md); font-size: clamp(2rem, 15vw, 3rem); font-weight: 700; color: var(--color-text); cursor: pointer; transition: background-color var(--duration-fast) var(--ease-out), transform var(--duration-fast) var(--ease-spring); -webkit-tap-highlight-color: transparent; } .cell:hover:not(:disabled) { background-color: var(--color-bg); } .cell:active:not(:disabled) { transform: scale(0.95); } .cell:focus-visible { outline: 2px solid var(--color-primary); outline-offset: -2px; } .cell:disabled { cursor: default; } .cell[data-symbol="X"] { color: var(--color-player-x); animation: popIn var(--duration-normal) var(--ease-spring); } .cell[data-symbol="O"] { color: var(--color-player-o); animation: popIn var(--duration-normal) var(--ease-spring); } @keyframes popIn { 0% { transform: scale(0.5); opacity: 0; } 70% { transform: scale(1.1); } 100% { transform: scale(1); opacity: 1; } } .cell.winning { animation: winPulse 0.6s ease-in-out infinite alternate; } @keyframes winPulse { from { transform: scale(1); } to { transform: scale(1.05); } } .status { font-size: 0.9375rem; font-weight: 500; color: var(--color-text-muted); text-align: center; min-height: 1.5em; padding: var(--space-2) var(--space-3); background: var(--color-surface); border-radius: var(--radius-md); transition: all var(--duration-normal) var(--ease-out); } .status.your-turn { color: var(--color-primary); background: rgba(99, 102, 241, 0.1); } .status.opponent-turn { color: var(--color-text-muted); } .status.win { color: #22c55e; background: rgba(34, 197, 94, 0.1); animation: bounceIn var(--duration-normal) var(--ease-spring); } .status.lose { color: #ef4444; background: rgba(239, 68, 68, 0.1); } .status.draw { color: var(--color-text-muted); background: var(--color-surface); } @keyframes bounceIn { 0% { transform: scale(0.8); } 50% { transform: scale(1.05); } 100% { transform: scale(1); } } .reset-btn { padding: var(--space-2) var(--space-4); background-color: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); font-size: 0.875rem; font-weight: 500; color: var(--color-text); cursor: pointer; transition: background-color var(--duration-fast) var(--ease-out), transform var(--duration-fast) var(--ease-spring); -webkit-tap-highlight-color: transparent; } .reset-btn:hover { background-color: var(--color-bg); } .reset-btn:active { transform: scale(0.97); } .reset-btn:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; } .reset-btn.hidden { display: none; } @media (max-width: 360px), (max-height: 500px) { body { padding: var(--space-2); } .game-wrapper { gap: var(--space-2); } .board { gap: 3px; padding: 3px; max-width: min(75vmin, 280px); } .cell { font-size: clamp(1.5rem, 12vmin, 2.5rem); } .status { font-size: 0.75rem; padding: var(--space-1) var(--space-2); } .reset-btn { font-size: 0.75rem; padding: var(--space-1) var(--space-3); } } @media (max-height: 400px) { .game-wrapper { flex-direction: row; flex-wrap: wrap; justify-content: center; gap: var(--space-2); } .board { max-width: min(70vmin, 250px); } .status { order: -1; width: auto; } } @media (min-height: 700px) and (min-width: 400px) { .board { max-width: min(85vmin, 380px); } .cell { font-size: clamp(2.5rem, 15vmin, 4rem); } } @media (prefers-reduced-motion: reduce) { .cell, .status, .reset-btn { transition: none; } .cell[data-symbol], .cell.winning, .status.win { animation: none; } }