/* Base modal styles */
.modal {
    --modal-zindex: 1055;
    --modal-width: 500px;
    --modal-padding: 1rem;
    --modal-margin: 0.5rem;
    --modal-color: #212529;
    --modal-bg: #fff;
    --modal-border-color: rgba(0,0,0,0.2);
    --modal-border-width: 1px;
    --modal-border-radius: 0.5rem;
    --modal-box-shadow: 0 0.5rem 1rem rgba(0,0,0,0.15);
    --modal-inner-border-radius: 0.5rem;
    --modal-header-padding-x: 1rem;
    --modal-header-padding-y: 0.5rem;
    --modal-header-border-color: #dee2e6;
    --modal-header-border-width: 1px;
    --modal-title-line-height: 1.5;
    --modal-footer-gap: 0.5rem;
    --modal-footer-bg: transparent;
    --modal-footer-border-color: #dee2e6;
    --modal-footer-border-width: 1px;
    position: fixed;
    top: 0;
    left: 0;
    z-index: var(--modal-zindex);
    display: none;
    width: 100%;
    height: 100%;
    overflow-x: hidden;
    overflow-y: auto;
    background-color: rgba(0,0,0,0.5); /* semi-transparent background */
    outline: 0;
    align-items: center; /* vertical center */
    justify-content: center; /* horizontal center */
}

/* Position wrapper */
.modal-dialog {
    position: relative;
    width: auto;
    margin: var(--modal-margin);
    pointer-events: none;
}

.modal.show .modal-dialog {
    transform: translateY(0);
}

.modal-dialog-centered {
    display: flex;
    align-items: center;
    min-height: calc(100% - var(--modal-margin) * 2);
}

.modal-dialog-scrollable {
    height: calc(100% - var(--modal-margin) * 2);
}

    .modal-dialog-scrollable .modal-content {
        max-height: 100%;
        overflow: hidden;
    }

    .modal-dialog-scrollable .modal-body {
        overflow-y: auto;
    }

/* Modal content */
.modal-content {
    position: relative;
    display: flex;
    flex-direction: column;
    width: 100%;
    color: var(--modal-color);
    pointer-events: auto;
    background-color: var(--modal-bg);
    background-clip: padding-box;
    border: var(--modal-border-width) solid var(--modal-border-color);
    border-radius: var(--modal-border-radius);
    box-shadow: var(--modal-box-shadow);
    outline: 0;
}

/* Backdrop */
.modal-backdrop {
    --backdrop-zindex: 1050;
    --backdrop-bg: #000;
    --backdrop-opacity: 0.5;
    position: fixed;
    top: 0;
    left: 0;
    z-index: var(--backdrop-zindex);
    width: 100vw;
    height: 100vh;
    background-color: var(--backdrop-bg);
    opacity: var(--backdrop-opacity);
}

/* Header */
.modal-header {
    display: flex;
    flex-shrink: 0;
    align-items: center;
    justify-content: space-between;
    padding: var(--modal-header-padding-y) var(--modal-header-padding-x);
    border-bottom: var(--modal-header-border-width) solid var(--modal-header-border-color);
    border-top-left-radius: var(--modal-inner-border-radius);
    border-top-right-radius: var(--modal-inner-border-radius);
}

    .modal-header .btn-close {
        padding: 0.25rem 0.25rem;
        margin: -0.25rem -0.25rem -0.25rem auto;
    }

/* Title */
.modal-title {
    margin-bottom: 0;
    line-height: var(--modal-title-line-height);
}

/* Body */
.modal-body {
    position: relative;
    flex: 1 1 auto;
    padding: var(--modal-padding);
}

/* Footer */
.modal-footer {
    display: flex;
    flex-shrink: 0;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
    padding: calc(var(--modal-padding) - var(--modal-footer-gap) * 0.5);
    background-color: var(--modal-footer-bg);
    border-top: var(--modal-footer-border-width) solid var(--modal-footer-border-color);
    border-bottom-left-radius: var(--modal-inner-border-radius);
    border-bottom-right-radius: var(--modal-inner-border-radius);
}

    .modal-footer > * {
        margin: calc(var(--modal-footer-gap) * 0.5);
    }

/* Sizes */
@media (min-width: 576px) {
    .modal-dialog {
        max-width: var(--modal-width);
        margin: 1.75rem auto;
    }

    .modal-sm {
        --modal-width: 300px;
    }
}

@media (min-width: 992px) {
    .modal-lg {
        --modal-width: 800px;
    }

    .modal-xl {
        --modal-width: 1140px;
    }
}