:root{color-scheme:dark;font-family:system-ui,-apple-system,Segoe UI,sans-serif}html,body{margin:0;padding:0;height:100%;background:#14161c;color:#e8e8ec;overscroll-behavior:none}#app{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100vh;width:100vw;box-sizing:border-box;padding:8px;gap:8px}#hud-row{width:min(100vmin,100%);flex:0 0 auto}#board-wrap{position:relative;flex:1 1 auto;min-height:0;width:100%;display:flex;align-items:center;justify-content:center}#board{touch-action:none;max-width:100%;max-height:100%}.hud{display:flex;justify-content:space-between;gap:8px;padding:6px 12px;background:#ffffff0d;border-radius:8px}.hud-item{display:flex;flex-direction:column;align-items:center;gap:2px;flex:1}.hud-label{font-size:10px;letter-spacing:.05em;color:#9aa0ac}.hud-value{font-weight:600;font-variant-numeric:tabular-nums}.hud-mute{flex:0 0 auto;align-self:center;border:none;background:none;font-size:18px;line-height:1;padding:4px 6px;cursor:pointer;color:inherit}.hud-mute:hover{opacity:.75}.game-over-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#0000008c}.game-over-overlay.hidden{display:none}.game-over-card{background:#1e2129;border-radius:12px;padding:24px 32px;text-align:center;box-shadow:0 8px 30px #0006}.game-over-card h1{margin:0 0 12px;font-size:22px;letter-spacing:.05em}.go-row{margin:4px 0;font-size:14px;color:#c7c9d1}.go-row span{font-weight:700;color:#fff}.go-new-highscore{margin:8px 0 0;font-size:13px;font-weight:700;letter-spacing:.05em;color:#ffd166}.go-new-highscore.hidden{display:none}.go-buttons{display:flex;gap:10px;margin-top:16px}.go-retry,.go-title{padding:8px 20px;font-size:14px;font-weight:600;border:none;border-radius:6px;color:#fff;cursor:pointer}.go-retry{background:#3b82f6}.go-retry:hover{background:#2563eb}.go-title{background:#ffffff1a}.go-title:hover{background:#ffffff2e}.title-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#000000b3;z-index:1}.title-overlay.hidden{display:none}.title-card{background:#1e2129;border-radius:12px;padding:28px 32px;text-align:center;box-shadow:0 8px 30px #0006}.title-card h1{margin:0 0 4px;font-size:28px;letter-spacing:.08em}.title-sub{margin:0 0 20px;font-size:13px;color:#9aa0ac}.difficulty-list{display:flex;flex-direction:column;gap:10px}.difficulty-option{display:flex;flex-direction:column;align-items:center;gap:2px;padding:10px 28px;border:2px solid transparent;border-radius:8px;background:#ffffff0f;color:#e8e8ec;cursor:pointer}.difficulty-option:hover{background:#ffffff1f}.difficulty-option.selected{border-color:#3b82f6}.difficulty-name{font-size:15px;font-weight:700;letter-spacing:.05em}.difficulty-meta{font-size:11px;color:#9aa0ac}.difficulty-highscore{font-size:11px;color:#ffd166;margin-top:2px}