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auto;touch-action:none;user-select:none;cursor:pointer}.practice-piece.placed{visibility:hidden}.practice-board .gap{background:color-mix(in srgb,var(--accent),var(--paper) 85%);outline-width:2px}.practice-board .line-cleared{background:color-mix(in srgb,var(--accent),var(--paper) 92%)}@media(max-height:600px){.practice-board{width:140px;margin-top:6px}.practice-board.line-board{width:130px}.practice-tray{min-height:44px}.practice-piece{padding-block:4px}.tutorial{gap:6px}.tutorial-actions,.tutorial .lesson-tip{margin-top:4px}}body{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}input,textarea,[contenteditable=true],[contenteditable=true] *{-webkit-user-select:text;user-select:text;-webkit-touch-callout:default}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}