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var(--bk-lift);position:absolute}.bk-board{transform:var(--bk-turn) translateZ(calc(var(--bk-th) / 2));background: linear-gradient(155deg, #ffffff2b 0%, #fff0 42%, #00000029 100%), var(--bk-noise), var(--bk-weave), var(--bk-cloth);background-size:auto,128px 128px,auto,auto;border-radius:2px 4px 4px 2px;inset:0;overflow:hidden;box-shadow:inset 1px 1px #ffffff38,inset -1px -1px #0003,inset -2px 0 3px -1px #ffffff1a}.bk-mat--paper .bk-board{background:linear-gradient(155deg, #ffffffa6 0%, #fff0 45%, #13252e0f 100%), var(--bk-noise), var(--bk-cloth);background-size:auto,128px 128px,auto;box-shadow:inset 0 0 0 1px #13252e12,inset -1px -1px #13252e14}.bk-back{transform:var(--bk-turn) translateZ(calc(var(--bk-th) / -2));background:linear-gradient(155deg, #00000026, #00000059), var(--bk-cloth);border-radius:2px 4px 4px 2px;inset:0;box-shadow:0 2px 2px #13252e40}.bk--cover .bk-back{display:none}.bk-spineface{top:0;left:calc((var(--bk-cw) - var(--bk-th)) / 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