:root{--bg-color: #e8e8e8;--cell-hidden-bg: #c0c0c0;--cell-hidden-border-light: #ffffff;--cell-hidden-border-dark: #808080;--cell-revealed-bg: #d0d0d0;--cell-exploded-bg: #ff4444;--accent: #4a90d9;--text-color: #222}*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg-color);color:var(--text-color);overflow-x:hidden;user-select:none;-webkit-user-select:none}.app{display:flex;flex-direction:column;align-items:center;padding:8px;min-height:100vh;max-width:520px;margin:0 auto}.title{font-size:22px;font-weight:700;margin-bottom:8px;text-align:center}