:root{--body-bg: #f0f2f5;--game-bg: white;--text-color: #333;--border-color: #ccc;--border-strong-color: #333;--cell-bg: white;--cell-given-bg: #f0f0f0;--cell-given-text: #000;--cell-filled-text: #007bff;--cell-selected-bg: #cce5ff;--cell-selected-outline: #007bff;--cell-same-value-bg: #e6f2ff;--cell-error-text: #dc3545;--cell-error-bg: #f8d7da;--cell-correct-bg: #A8D4B4;--btn-bg: #f0f0f0;--btn-border: #bbb;--btn-text: #212529;--btn-hover-bg: #e0e0e0;--btn-primary-bg: #67a9e4;--btn-primary-text: white;--btn-primary-hover-bg: #538bbc;--timer-color: #67a9e4;--modal-bg: white;--modal-overlay-bg: rgba(0, 0, 0, .45);--tooltip-bg: #333;--tooltip-text: white;--link-color: #007bff;--icon-color: #212529;--theme-toggle-icon-hover-bg: rgba(0, 0, 0, .05);--gotd-active-bg: #F5B000;--gotd-active-hover-bg: #FFCA28;--gotd-completed-bg: mediumseagreen;--gotd-completed-hover-bg: #3CB371;--footer-text-color: #777;--lang-modal-btn-bg: var(--btn-bg);--lang-modal-btn-hover-bg: 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