/* Game Layout */
.puzzle-area {
    width: 100%;
    max-width: 900px;
}

.puzzle-header {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 2rem;
    gap: 1rem;
}

.date-display {
    min-width: 200px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

#current-date {
    font-size: 1.25rem;
    font-weight: 600;
}

.game-container {
    display: flex;
    justify-content: center;
    gap: 2rem;
    align-items: flex-start;
    flex-wrap: wrap;
}

/* Controls */
.left-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 160px;
}

.right-controls {
    display: flex;
    flex-direction: row;
    gap: 1rem;
    justify-content: center;
    width: 100%;
    margin-top: 1rem;
}

/* Numpad */
.numpad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    background: #fff;
    padding: 1rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.num-btn {
    aspect-ratio: 1;
    border: 1px solid var(--border-color);
    background: var(--bg-color);
    border-radius: 4px;
    font-size: 1.1rem;
    font-weight: 400;
    font-family: 'Noto Serif JP', serif;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.2s;
}

.num-btn:hover {
    background-color: var(--btn-hover);
    border-color: var(--text-color);
}

.num-btn:active {
    background-color: var(--border-color);
    transform: translateY(1px);
}

.action-btn {
    grid-column: span 2;
}

.delete-btn {
    grid-column: 2 / 4;
    border: 1px solid var(--error-color);
    color: var(--error-color);
    background: #fff;
    border-radius: 8px;
    font-size: 1.25rem;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
}

.delete-btn:hover {
    background-color: #fff5f5;
}

/* Mode Controls */
.mode-toggle {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    background: #fff;
    padding: 0.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    width: 100%;
}

.mode-btn {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    width: 100%;
    border: 1px solid transparent;
    border-radius: 8px;
    background: transparent;
    cursor: pointer;
    font-weight: 500;
    color: var(--secondary-color);
    transition: all 0.2s;
}

.mode-btn.active {
    background-color: #f4eee1;
    color: var(--primary-color);
    border-color: #dcd0b9;
}

.kbd-hint {
    font-size: 0.65rem;
    padding: 2px 4px;
    background-color: #eee;
    border-radius: 3px;
    border: 1px solid #b4b4b4;
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2), 0 2px 0 0 rgba(255, 255, 255, 0.7) inset;
    color: #333;
    margin-left: auto;
    font-family: 'Inter', sans-serif;
    font-weight: 700;
}

.mode-btn.active .kbd-hint {
    background-color: #f7f7f7;
    border-color: #dcd0b9;
    color: var(--primary-color);
}


/* Puzzle Grid */
.puzzle-grid {
    display: grid;
    background-color: var(--cell-border);
    gap: 0;
    border: 2px solid var(--cell-border);
    user-select: none;
    box-shadow: var(--shadow-md);
}

.cell {
    background-color: var(--grid-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    cursor: pointer;
    aspect-ratio: 1;
    width: 80px;
    height: 80px;
    border: 1px solid rgba(0, 0, 0, 0.05);
    transition: background-color 0.3s ease;
}

.puzzle-grid.show-grid .cell {
    border: 1px solid var(--cell-border);
}

.cell.selected {
    background-color: #f1ebd7;
}

.cell:hover:not(.selected) {
    background-color: #f8f9fa;
}

.arrow {
    position: absolute;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    pointer-events: none;
    z-index: 1;
}

.arrow img {
    width: 85%;
    height: 85%;
    object-fit: contain;
    opacity: 0.8;
}

.cell-value {
    position: absolute;
    font-size: 1.5rem;
    font-weight: 700;
    z-index: 10;
    color: var(--primary-color);
    pointer-events: none;
}

.cell-value.initial {
    color: var(--text-color);
}

.cell-value.error {
    color: var(--error-color);
}

.pencil-marks {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    padding: 2px;
    pointer-events: none;
    z-index: 2;
}

.pencil-mark {
    font-size: 1rem;
    font-weight: 600;
    color: var(--pencil-color);
    display: flex;
    justify-content: center;
    align-items: center;
    line-height: 1;
}

/* Control Buttons */
.control-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    border: 1px solid transparent;
    border-radius: 4px;
    font-weight: 500;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: transparent;
    color: var(--text-color);
}

.control-btn.primary {
    background-color: transparent;
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.control-btn.primary:hover {
    background-color: var(--primary-color);
    color: white;
}

.control-btn.secondary {
    border-color: var(--border-color);
    color: var(--secondary-color);
}

.control-btn.secondary:hover {
    background-color: var(--btn-hover);
    color: var(--text-color);
}

.control-btn.danger {
    border-color: var(--error-color);
    color: var(--error-color);
}

.control-btn.danger:hover {
    background-color: var(--error-color);
    color: white;
}

/* Responsive */
.center-column {
    display: flex;
    flex-direction: column;
    align-items: center;
}

@media (max-width: 1024px),
(pointer: coarse) {
    .game-container {
        flex-direction: column;
        align-items: center;
    }

    .left-controls {
        margin-top: 0 !important;
        flex-direction: row;
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }

    .right-controls {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }
}

/* Only hide side numpad on touch devices which use the popup modal */
@media (pointer: coarse) {
    .left-controls .numpad {
        display: none;
    }
}

/* Numpad in Modal */
.popup-numpad {
    border: none;
    box-shadow: none;
    padding: 0;
    background: transparent;
}

.numpad-modal-content {
    max-width: 260px;
    padding: 1rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

#numpad-modal {
    background: transparent;
    backdrop-filter: none;
}

#numpad-modal .modal-content {
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
}

.mobile-num-btn {
    font-size: 1rem;
    padding: 0.5rem;
    background-color: rgba(255, 255, 255, 0.8);
}

#btn-close-numpad {
    margin-top: 0.75rem !important;
    padding: 0.5rem;
    font-size: 0.9rem;
}