/* Modal Overlay: Semi-transparent background blur */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

/* Modal: Centred window with customisable dimensions */
.modal {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: var(--color-bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 5px 30px var(--color-shadow);
    z-index: 1001;
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
}

/* Show/hide modal and overlay */
.modal.show,
.modal-overlay.show {
    display: block;
}

/* Modal header with title and close button */
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-bg-secondary);
}

.modal-title {
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--text-xl);
    cursor: pointer;
    color: var(--color-text-secondary);
}

.modal-close:hover {
    color: var(--color-text-primary);
}

/* Cart items container with vertical scroll */
.cart-items {
    max-height: calc(80vh - 200px);
    overflow-y: auto;
    margin-bottom: var(--spacing-lg);
}

/* Cart item: Book display with cover, info and controls */
.cart-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-bg-secondary);
}

.cart-item:last-child {
    border-bottom: none;
}

.cart-item-cover {
    width: 60px;
    height: 80px;
    background-size: cover;
    background-position: center;
    border-radius: var(--border-radius-sm);
    margin-right: var(--spacing-md);
}

.cart-item-info {
    flex-grow: 1;
}

.cart-item-title {
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
    font-family: var(--font-heading);
}

.cart-item-author {
    color: var(--color-text-secondary);
    font-size: var(--text-xs);
    margin-bottom: var(--spacing-xs);
}

.cart-item-price {
    color: var(--secondary-500);
    font-weight: 600;
    font-family: var(--font-button);
}

/* Cart item controls: Quantity adjusters and remove button */
.cart-item-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-right: var(--spacing-md);
}

.quantity-btn {
    width: 30px;
    height: 30px;
    border: 1px solid var(--color-bg-secondary);
    background: var(--color-bg-primary);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: var(--color-text-primary);
    transition: all var(--transition-speed) var(--transition-timing);
    font-family: var(--font-button);
}

.quantity-btn:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-text-secondary);
}

.quantity-input {
    width: 50px;
    height: 30px;
    border: 1px solid var(--color-bg-secondary);
    border-radius: var(--border-radius-sm);
    text-align: center;
    font-size: var(--text-sm);
    font-family: var(--font-button);
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    appearance: none;
    -moz-appearance: textfield;
}

.quantity-input::-webkit-inner-spin-button,
.quantity-input::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.remove-btn {
    width: 30px;
    height: 30px;
    border: none;
    background: none;
    color: var(--color-danger);
    cursor: pointer;
    padding: 0;
    font-size: var(--text-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition-speed) var(--transition-timing);
}

.remove-btn:hover {
    color: var(--color-danger-hover);
}

/* Cart summary: Total price and checkout button */
.cart-total {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    border-top: 2px solid var(--color-bg-secondary);
    margin-top: var(--spacing-md);
}

.total-label {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    font-family: var(--font-heading);
}

.total-amount {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--secondary-500);
    font-family: var(--font-button);
}

.checkout-btn {
    display: block;
    width: 100%;
    padding: var(--spacing-md);
    background-color: var(--secondary-500);
    color: var(--color-bg-primary);
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: var(--text-md);
    font-weight: 600;
    cursor: pointer;
    font-family: var(--font-button);
}

.checkout-btn:hover {
    background-color: var(--secondary-900);
}

/* Empty cart notification */
.empty-cart {
    text-align: center;
    padding: var(--spacing-xl) 0;
    color: var(--color-text-secondary);
}

.empty-cart i {
    font-size: var(--text-xxl);
    margin-bottom: var(--spacing-md);
    display: block;
}

/* Portrait mode: Vertical controls layout */
@media (orientation: portrait) {
    .cart-item-controls {
        flex-direction: column;
        margin-right: var(--spacing-sm);
        gap: var(--spacing-xs);
    }

    .quantity-btn.plus {
        order: 1;
    }

    .quantity-input {
        order: 2;
    }

    .quantity-btn.minus {
        order: 3;
    }

    .remove-btn {
        order: 4;
    }

    .quantity-btn {
        width: 24px;
        height: 24px;
        font-size: var(--text-sm);
    }

    .quantity-input {
        width: 36px;
        height: 24px;
        font-size: var(--text-xs);
    }

    .remove-btn {
        width: 24px;
        height: 24px;
        font-size: var(--text-sm);
    }
}