/*
 * noVNC general input element CSS
 * Copyright (C) 2025 The noVNC authors
 * noVNC is licensed under the MPL 2.0 (see LICENSE.txt)
 * This file is licensed under the 2-Clause BSD license (see LICENSE.txt).
 */

/*
 * Common for all inputs
 */
:root {
    --input-xpadding: 1em;
}

input, input::file-selector-button, button, select, textarea {
    /* Respect standard font settings */
    font: inherit;

    /* Disable default rendering */
    appearance: none;

    padding: 0.5em var(--input-xpadding);
    border: 1px solid var(--novnc-lightgrey);
    border-radius: 6px;
}

/*
 * Button activations
 */

/* A color overlay that depends on the activation level. The level can then be
   set for different states on an element, for example hover and click on a
   <button>. */
input, button, select, option,
input::file-selector-button,
.button-activations {
    --button-activation-level: 0;
    /* Note that CSS variables aren't functions, beware when inheriting */
    --button-activation-alpha: calc(0.08 * var(--button-activation-level));
    /* FIXME: We want the image() function instead of the linear-gradient()
              function below. But it's not supported in the browsers yet. */
    --button-activation-overlay:
        linear-gradient(rgba(0, 0, 0, var(--button-activation-alpha))
        100%, transparent);
    --button-activation-overlay-light:
        linear-gradient(rgba(255, 255, 255, calc(0.23 * var(--button-activation-level)))
        100%, transparent);
}
.button-activations {
    background-image: var(--button-activation-overlay);

    /* Disable Chrome's touch tap highlight to avoid conflicts with overlay */
    -webkit-tap-highlight-color: transparent;
}
/* When we want the light overlay on activations instead.
   This is best used on elements with darker backgrounds. */
.button-activations.light-overlay {
    background-image: var(--button-activation-overlay-light);
    /* Can't use the normal blend mode since that gives washed out colors. */
    /* FIXME: For elements with these activation overlays we'd like only
              the luminosity to change. The proprty "background-blend-mode" set
              to "luminosity" sounds good, but it doesn't work as intended,
              see: https://bugzilla.mozilla.org/show_bug.cgi?id=1806417 */
    background-blend-mode: overlay;
}

input:hover, button:hover, select:hover, option:hover,
input::file-selector-button:hover,
.button-activations:hover {
    --button-activation-level: 1;
}
/* Unfortunately we have to disable the :hover effect on touch devices,
   otherwise the style lingers after tapping the button. */
@media (any-pointer: coarse) {
    input:hover, button:hover, select:hover, option:hover,
    input::file-selector-button:hover,
    .button-activations:hover {
        --button-activation-level: 0;
    }
}
input:active, button:active, select:active, option:active,
input::file-selector-button:active,
.button-activations:active {
    --button-activation-level: 2;
}
input:disabled, button:disabled, select:disabled, select:disabled option,
input:disabled::file-selector-button,
.button-activations:disabled {
    --button-activation-level: 0;
}

/*
 * Buttons
 */
input[type=button],
input[type=color],
input[type=image],
input[type=reset],
input[type=submit],
input::file-selector-button,
button,
select {
    border-bottom-width: 2px;
    color: black;
    font-weight: bold;
    background-color: var(--novnc-buttongrey);
    background-image: var(--button-activation-overlay);

    /* Disable Chrome's touch tap highlight */
    -webkit-tap-highlight-color: transparent;
}

/*
 * Select dropdowns
 */
select {
    --select-arrow: url('data:image/svg+xml;utf8, \
        <svg width="11" height="6" version="1.1" viewBox="0 0 11 6" \
             xmlns="http://www.w3.org/2000/svg"> \
            <path d="m10.5.5-5 5-5-5" fill="none" \
                  stroke="black" stroke-width="1.5" \
                  stroke-linecap="round" stroke-linejoin="round"/> \
        </svg>');

    /* FIXME: A bug in Firefox, requires a workaround for the background:
              https://bugzilla.mozilla.org/show_bug.cgi?id=1810958 */
    /* The dropdown list will show the select element's background above and
       below the options in Firefox. We want the entire dropdown to be white. */
    background-color: white;
    /* However, we don't want the select element to actually show a white
       background, so let's place a gradient above it with the color we want. */
    --grey-background: linear-gradient(var(--novnc-buttongrey) 100%,
                                       transparent);
    background-image:
        var(--select-arrow),
        var(--button-activation-overlay),
        var(--grey-background);
    background-position: calc(100% - var(--input-xpadding)), left top, left top;
    background-repeat: no-repeat;
    padding-right: calc(2*var(--input-xpadding) + 11px);
}
/* FIXME: :active isn't set when the <select> is opened in Firefox:
          https://bugzilla.mozilla.org/show_bug.cgi?id=1805406 */
select:active {
    /* Rotated arrow */
    background-image: url('data:image/svg+xml;utf8, \
        <svg width="11" height="6" version="1.1" viewBox="0 0 11 6" \
             xmlns="http://www.w3.org/2000/svg" transform="rotate(180)"> \
            <path d="m10.5.5-5 5-5-5" fill="none" \
                  stroke="black" stroke-width="1.5" \
                  stroke-linecap="round" stroke-linejoin="round"/> \
        </svg>'),
        var(--button-activation-overlay),
        var(--grey-background);
}
option {
    /* Prevent Chrome from inheriting background-color from the <select> */
    background-color: white;
    color: black;
    font-weight: normal;
    background-image: var(--button-activation-overlay);
}

/*
 * Shared between checkboxes and radiobuttons
 */

input[type=radio],
input[type=checkbox] {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    border-color: transparent;
    background-color: var(--novnc-buttongrey);
    background-image: var(--button-activation-overlay);
    /* Disable Chrome's touch tap highlight to avoid conflicts with overlay */
    -webkit-tap-highlight-color: transparent;
    width: 16px;
    --checkradio-height: 16px;
    height: var(--checkradio-height);
    padding: 0;
    margin: 0 6px 0 0;
    /* Don't have transitions for outline in order to be consistent
       with other elements */
    transition: all 0.2s, outline-color 0s, outline-offset 0s;

    /* A transparent outline in order to work around a graphical clipping issue
       in WebKit. See bug: https://bugs.webkit.org/show_bug.cgi?id=256003 */
    outline: 1px solid transparent;
    position: relative; /* Since ::before & ::after are absolute positioned */

    /* We want to align with the middle of capital letters, this requires
       a workaround. The default behavior is to align the bottom of the element
       on top of the text baseline, this is too far up.
       We want to push the element down half the difference in height between
       it and a capital X. In our font, the height of a capital "X" is 0.698em.
     */
    vertical-align: calc(0px - (var(--checkradio-height) - 0.698em) / 2);
    /* FIXME: Could write 1cap instead of 0.698em, but it's only supported in
              Firefox as of 2023 */
    /* FIXME: We probably want to use round() here, see bug 8148 */
}
input[type=radio]:focus-visible,
input[type=checkbox]:focus-visible {
    outline-color: var(--novnc-lightblue);
}
input[type=checkbox]::before,
input[type=checkbox]::after,
input[type=radio]::before,
input[type=radio]::after {
    content: "";
    display: block; /* width & height doesn't work on inline elements */
    transition: inherit;
    /* Let's prevent the pseudo-elements from taking up layout space so that
       the ::before and ::after pseudo-elements can be in the same place. This
       is also required for vertical-align: baseline to work like we want it to
       on radio/checkboxes. If the pseudo-elements take up layout space, the
       baseline of text inside them will be used instead. */
    position: absolute;
}
input[type=checkbox]::after,
input[type=radio]::after {
    width: 10px;
    height: 2px;
    background-color: transparent;
    border-radius: 2px;
}

/*
 * Checkboxes
 */
input[type=checkbox] {
    border-radius: 4px;
}
input[type=checkbox]:checked,
input[type=checkbox]:indeterminate {
    background-color: var(--novnc-blue);
    background-image: var(--button-activation-overlay-light);
    background-blend-mode: overlay;
}
input[type=checkbox]::before {
    width: 25%;
    height: 55%;
    border-style: solid;
    border-color: transparent;
    border-width: 0 2px 2px 0;
    border-radius: 1px;
    transform: translateY(-1px) rotate(35deg);
}
input[type=checkbox]:checked::before {
    border-color: white;
}
input[type=checkbox]:indeterminate::after {
    background-color: white;
}

/*
 * Radiobuttons
 */
input[type=radio] {
    border-radius: 50%;
    border: 1px solid transparent; /* To ensure a smooth transition */
}
input[type=radio]:checked {
    border: 4px solid var(--novnc-blue);
    background-color: white;
    /* button-activation-overlay should be removed from the radio
       element to not interfere with button-activation-overlay-light
       that is set on the ::before element. */
    background-image: none;
}
input[type=radio]::before {
    width: inherit;
    height: inherit;
    border-radius: inherit;
    /* We can achieve the highlight overlay effect on border colors by
       setting button-activation-overlay-light on an element that stays
       on top (z-axis) of the element with a border. */
    background-image: var(--button-activation-overlay-light);
    mix-blend-mode: overlay;
    opacity: 0;
}
input[type=radio]:checked::before {
    opacity: 1;
}
input[type=radio]:indeterminate::after {
    background-color: black;
}

/*
 * Range sliders
 */
input[type=range] {
    border: unset;
    border-radius: 3px;
    height: 20px;
    padding: 0;
    background: transparent;
}
/* -webkit-slider.. & -moz-range.. cant be in selector lists:
   https://bugs.chromium.org/p/chromium/issues/detail?id=1154623 */
input[type=range]::-webkit-slider-runnable-track {
    background-color: var(--novnc-blue);
    height: 6px;
    border-radius: 3px;
}
input[type=range]::-moz-range-track {
    background-color: var(--novnc-blue);
    height: 6px;
    border-radius: 3px;
}
input[type=range]::-webkit-slider-thumb {
    appearance: none;
    width: 18px;
    height: 20px;
    border-radius: 6px;
    background-color: white;
    background-image: var(--button-activation-overlay);
    /* Disable Chrome's touch tap highlight to avoid conflicts with overlay */
    -webkit-tap-highlight-color: transparent;
    border: 1px solid dimgray;
    margin-top: -7px;
}
input[type=range]::-moz-range-thumb {
    appearance: none;
    width: 18px;
    height: 20px;
    border-radius: 6px;
    background-color: white;
    background-image: var(--button-activation-overlay);
    border: 1px solid dimgray;
    margin-top: -7px;
}

/*
 * File choosers
 */
input[type=file] {
    background-image: none;
    border: none;
}
input::file-selector-button {
    margin-right: 6px;
}

/*
 * Focus (tab)
 */
input:focus-visible,
input:focus-visible::file-selector-button,
button:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--novnc-lightblue);
    outline-offset: 1px;
}
input[type=file]:focus-visible {
    outline: none; /* We outline the button instead of the entire element */
}

/*
 * Disabled
 */
input:disabled,
input:disabled::file-selector-button,
button:disabled,
select:disabled,
textarea:disabled {
    opacity: 0.4;
}
select:disabled {
    background-image:
        var(--select-arrow),
        var(--grey-background);
}
input[type=image]:disabled {
    /* See Firefox bug:
       https://bugzilla.mozilla.org/show_bug.cgi?id=1798304 */
    cursor: default;
}