:root {
    --sdp-selected: #005fcc;
    --sdp-selected-invert: #ffffff;
    --sdp-prev-month: #888888;
    --sdp-next-month: #888888;
    --sdp-disabled: #1010104d;
    --sdp-disabled-invert: #ffffff;
    --sdp-background: #ffffff;
    --sdp-border: #dddddd;
    --sdp-shadow: 0deg 0% 50%;
    --sdp-icon: #4a4a4acc;
    --sdp-nav-button-background: #f5f5f5;
    --sdp-nav-button-background-hover: #eeeeee;
    --sdp-days-of-week: #4a4a4a;
}

@keyframes fadeIn {
    from {
        transform: translateY(-40px) scale(0.75);
        opacity: 0;
    }
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}
@keyframes fadeOut {
    from {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
    to {
        transform: translateY(-40px) scale(0.75);
        opacity: 0;
    }
}

[data-controller="datepicker"] {
    position: relative;
}
.sdp-cal {
    z-index: 1;
    position: absolute;
    margin-top: 5px;
    box-sizing: border-box;
    width: fit-content;
    border: 1px solid var(--sdp-border);
    border-radius: 5px;
    padding: 15px;
    background: var(--sdp-background);
    box-shadow: 0 1.25em 1.25em -0.9375em hsl(var(--sdp-shadow) / 0.3);
}
.sdp-cal.fade-in {
    animation: fadeIn 0.1s ease-out;
}
.sdp-cal.fade-out {
    animation: fadeOut 0.1s ease-out;
}
@media (prefers-reduced-motion) {
    .sdp-cal.fade-in, .sdp-cal.fade-out {
        animation: none
    }
}
.sdp-cal button {
    border: none;
    background: none;
    padding: 0;
}

.sdp-nav {
    margin-bottom: 1.2em;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.sdp-nav-dropdowns, .sdp-nav-buttons {
    display: flex;
}
.sdp-nav-dropdowns select {
    -moz-appearance: none;
    -webkit-appearance: none;
    background: var(--sdp-background);
    color: currentColor;
    padding: 1px 12px 1px 1px;
    border: 1px solid transparent;
    font-size: 1.1em;
    font-weight: 500;
    cursor: pointer;
}
.sdp-nav-dropdowns > div {
    display: flex;
    align-items: center;
}
.sdp-nav-dropdowns > div::after {
    content: " ";
    border: 2px solid var(--sdp-icon);
    border-top: 0;
    border-right: 0;
    width: 0.3em;
    height: 0.3em;
    transform: translateY(-1px) rotate(-45deg);
    right: 10px;
    position: relative;
}
.sdp-nav-buttons button {
    display: flex;
    place-content: center;
    place-items: center;
    border-radius: 50%;
    width: 1.5em;
    height: 1.5em;
    color: var(--sdp-icon);
    background-color: var(--sdp-nav-button-background);
    cursor: pointer;
}
.sdp-nav-buttons button:hover {
    background-color: var(--sdp-nav-button-background-hover);
}
.sdp-nav-buttons svg {
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    width: 0.75em;
    height: 0.75em;
}
.sdp-goto-today {
    margin-left: 0.3em;
    margin-right: 0.3em;
}

.sdp-days-of-week, .sdp-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    place-items: center;
    gap: 0.3em;
}
.sdp-days-of-week {
    margin-bottom: 0.7em;
}
.sdp-days-of-week div {
    text-transform: uppercase;
    font-size: 0.8em;
    color: var(--sdp-days-of-week);
    font-weight: 600;
}

.sdp-days button {
    width: 4.5ch;
    height: 4.5ch;
    border-radius: 50%;
    background-color: transparent;
}
.sdp-days button:not([aria-disabled]) {
    color: currentColor;
    cursor: pointer;
}
.sdp-days button[aria-disabled] {
    color: var(--sdp-disabled);
}

.sdp-days button:not([aria-disabled]).sdp-selected {
    background-color: var(--sdp-selected);
    color: var(--sdp-selected-invert);
}
.sdp-days button[aria-disabled].sdp-selected {
    background-color: var(--sdp-disabled);
    color: var(--sdp-disabled-invert);
}

.sdp-days button:not([aria-disabled]).sdp-today {
    border: 1px solid var(--sdp-selected);
}
.sdp-days button[aria-disabled].sdp-today {
    border: 1px solid var(--sdp-disabled);
}

/* Ideally we would use outline and outline-offset for the :hover and :focus
 * styles.  But Safari's outline doesn't follow the border-radius; it is square.
 * https://bugs.webkit.org/show_bug.cgi?id=231433
 * https://bugs.webkit.org/show_bug.cgi?id=20807
 */
.sdp-days button:hover,
.sdp-days button:focus {
    outline: none;
}

.sdp-days button:not([aria-disabled]):hover,
.sdp-days button:not([aria-disabled]):focus {
    border: 2px solid var(--sdp-selected);
}
.sdp-days button[aria-disabled]:hover,
.sdp-days button[aria-disabled]:focus {
    border: 2px solid var(--sdp-disabled);
}

.sdp-days button:not([aria-disabled]).sdp-selected:hover,
.sdp-days button:not([aria-disabled]).sdp-selected:focus {
    border: 2px solid var(--sdp-selected-invert);
    box-shadow: 0 0 0 2px var(--sdp-selected);
}
.sdp-days button[aria-disabled].sdp-selected:hover,
.sdp-days button[aria-disabled].sdp-selected:focus {
    border: 2px solid var(--sdp-disabled-invert);
    box-shadow: 0 0 0 2px var(--sdp-disabled);
}

.sdp-days button:not([aria-disabled]).sdp-today:hover,
.sdp-days button:not([aria-disabled]).sdp-today:focus {
    border: 2px solid var(--sdp-selected);
}
.sdp-days button[aria-disabled].sdp-today:hover,
.sdp-days button[aria-disabled].sdp-today:focus {
    border: 2px solid var(--sdp-disabled);
}

.sdp-days button:not([aria-disabled]).sdp-prev-month {
    color: var(--sdp-prev-month);
}
.sdp-days button:not([aria-disabled]).sdp-next-month {
    color: var(--sdp-next-month);
}
.sdp-days button[aria-disabled].sdp-prev-month,
.sdp-days button[aria-disabled].sdp-next-month {
    color: var(--sdp-disabled);
}
Explicar