:root {
    --cell-size: 45px;
    --board-bg: #F7F3E8;
    --cell-border: #DCD0B9;
    --container-bg: #ffffff;
    --text-color: #555;
    --soft-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #f0f0f0;
    user-select: none;
    color: var(--text-color);
}

.main-container {
    display: flex;
    justify-content: center;
    gap: 20px;
    /*padding: 20px;*/
}

.left-container, .right-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.header-container {
    text-align: center;
}

#game-board {
    display: grid;
    grid-template-columns: repeat(7, var(--cell-size));
    grid-template-rows: repeat(9, var(--cell-size));
    border: 3px solid #A98C78;
    border-radius: 8px;
    background-color: var(--board-bg);
    position: relative;
    box-shadow: var(--soft-shadow), inset 0 0 10px rgba(0, 0, 0, 0.03);
}

.cell {
    width: var(--cell-size);
    height: var(--cell-size);
    border: 1px solid #ccc;
    box-sizing: border-box;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 14px;
    color: #a09080;
}

.cell-month {
    color: blue;
}

.cell-date {
    color: black;
}

.cell-day {
    color: green;
}

.cell-filler {
    color: gray;
}


#pieces-container {
    width: 820px;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    padding: 15px;
    background: var(--container-bg);
    border: 2px dashed var(--cell-border);
    border-radius: 10px;
}

.piece-slot {
    position: relative;
}

.pentomino-piece {
    display: grid;
    position: absolute;
    top: 0;
    left: 0;
    transition: transform 0.15s cubic-bezier(0.2, 0.8, 0.2, 1);
    pointer-events: none;
}

.pentomino-piece.dragging {
    cursor: grabbing;
    z-index: 1000;
    transform: scale(1.05);
}

#game-board > .pentomino-piece {
    position: absolute;
}

.piece-block {
    width: var(--cell-size);
    height: var(--cell-size);
    cursor: grab;
    pointer-events: auto;
    box-sizing: border-box;
    border-radius: 8px;
    border: 1px solid rgba(0, 0, 0, 0.05);
    box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.3),
    inset 0 -1px 1px rgba(0, 0, 0, 0.05);
}

.piece-theme-0 .piece-block {
    background-color: #F0A500;
}

.piece-theme-1 .piece-block {
    background-color: #A0A0A0;
}

.piece-theme-2 .piece-block {
    background-color: #4A4A4A;
}

.piece-theme-3 .piece-block {
    background-color: #F3E5AB;
}

.piece-theme-4 .piece-block {
    background-color: #F5F5F5;
    border: 1px solid #E0E0E0; /* 하얀색은 테두리가 필요 */
}

.piece-theme-5 .piece-block {
    background-color: #8C92AC;
}

.piece-theme-6 .piece-block {
    background-color: #D2691E;
}

.piece-theme-7 .piece-block {
    background-color: #FFC0CB;
}

.piece-theme-8 .piece-block {
    background-color: #2C3E50;
}

.piece-theme-9 .piece-block {
    background-color: #FFFACD;
}

.piece-theme-10 .piece-block {
    background-color: #8D6E63;
}

.piece-theme-11 .piece-block {
    background-color: #C8A2C8;
}

.toast {
    visibility: hidden;
    min-width: 280px;
    background-color: #333;
    color: #fff;
    text-align: center;
    border-radius: 5px;
    padding: 16px;
    position: fixed;
    z-index: 1001;
    left: 50%;
    bottom: 30px;
    font-size: 16px;

    transform: translatex(-50%) translateY(30px);
    opacity: 0;

    transition: opacity 0.5s, transform 0.5s cubic-bezier(0.25, 0.1, 0.25, 1) 0s, -webkit-transform 0.5s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.toast.show {
    visibility: visible;
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}