/*
 * <x-button>: M3 Expressive's buttons — label button, icon button and toggle — and the page's
 * create action that is a FAB on a compact window.
 *
 * Geometry from androidx Compose Material 3's tokens (Apache-2.0), per `data-md-size`:
 *
 *   size  height  label padding  gap   type         icon (label / icon-only)  outline  square  pressed
 *   xs    32px    16px           8px   label-lg     20 / 20px                 1px      md      sm
 *   sm    40px    16px           8px   label-lg     20 / 24px                 1px      md      sm
 *   md    56px    24px           8px   title-md     24 / 24px                 1px      lg      md
 *   lg    96px    48px           12px  headline-sm  32 / 32px                 2px      xl      lg
 *   xl    136px   64px           16px  headline-lg  40 / 40px                 3px      xl      lg
 *
 * (ButtonXSmall…XLargeTokens; the xs padding is the 16px Phase D settled on, ACT-09.) An icon button
 * (`data-md-icon-button`) is as tall and `narrow`, `default` or `wide` across by
 * XSmall…XLargeIconButtonTokens: 28/32/40, 32/40/52, 48/56/72, 64/96/128 and 104/136/184px. The
 * views size the glyphs through `<x-icon size>`; `--md-button-icon` carries the same size for the
 * loading indicator that stands in for the glyph while the button's action runs.
 *
 * Shape: round (`--md-sys-shape-corner-full`) by default; `data-md-shape="square"` and a selected
 * button take the size's square corner, a selected square icon button turns round, and every one
 * squares off to the pressed corner under the finger. Those corner rules are wrapped in `:where()`,
 * so they carry no specificity at all: a group's stylesheet (button-group.css, split-button.css)
 * reshapes the buttons inside it with any selector, without a specificity fight.
 *
 * Colour: `data-md-color` picks the roles a variant draws with; the variants set
 * `--md-button-container`, `--md-button-label`, `--md-button-outline` and `--md-button-elevation`,
 * which one rule paints, so the disabled treatment (on-surface at 10% behind 38% text,
 * FilledButtonTokens.DisabledContainerOpacity and DisabledLabelTextOpacity) replaces them with a
 * plain declaration. Primary's tonal button is secondary-container and its standard icon button
 * on-surface-variant, as M3 draws them; the text button's label is primary, as Compose draws it,
 * not the token's on-surface-variant, which its own source marks as wrong; a selected text button
 * takes the tonal container (the library's deliberate deviations, docs/audits/m3-alignment).
 *
 * Motion: corners, padding, margins and `bottom` on the fast spatial spring, colour and shadow on
 * the fast effects spring beside it — a colour must never overshoot (tokens/motion.css).
 *
 * The button renders the foundation's `md-state-layer` and `md-focus-ring`
 * (foundation/interaction.css), and, at `xs` and `sm` where it draws under 48px, `md-touch-target`
 * too; nothing here copies their rules.
 *
 * `data-md-compact-fab`: below `medium` (600px) the button is an extended FAB in the thumb zone —
 * fixed 16px from the end, 56px tall with 16px padding, the large corner, `title-md`,
 * primary-container at elevation 3 (ExtendedFabPrimaryTokens) — lifted clear of a bottom bar and
 * of a snackbar on screen (`--material-bottom-bar`, `--material-snackbar-height`), because M3 puts a
 * snackbar above a FAB and never over one. From `medium` it is the button it was written as.
 * `data-md-responsive` on the label hides it below `expanded` (840px).
 */

@layer material.reset, material.tokens, material.base, material.layout, material.components, material.text, material.visibility;

@import './icon.css';
@import './loading.css';
@import './tooltip.css';

@layer material.components {
    [data-md-button] {
        --md-button-color: var(--md-sys-color-primary);
        --md-button-on-color: var(--md-sys-color-on-primary);
        --md-button-tone: var(--md-sys-color-secondary-container);
        --md-button-on-tone: var(--md-sys-color-on-secondary-container);
        --md-button-tone-selected: var(--md-sys-color-secondary);
        --md-button-on-tone-selected: var(--md-sys-color-on-secondary);
        --md-button-quiet: var(--md-sys-color-on-surface-variant);

        --md-button-container: transparent;
        --md-button-label: var(--md-button-color);
        --md-button-outline: transparent;
        --md-button-elevation: none;

        display: inline-flex;
        flex-shrink: 0;
        align-items: center;
        justify-content: center;
        block-size: var(--md-button-height);
        background-color: var(--md-button-container);
        color: var(--md-button-label);
        box-shadow: var(--md-button-elevation);
        white-space: nowrap;
        cursor: pointer;
        -webkit-user-select: none;
        user-select: none;
        transition-property: border-radius, padding, margin, bottom, background-color, color, box-shadow;
        transition-duration:
            var(--md-sys-motion-spatial-fast-duration), var(--md-sys-motion-spatial-fast-duration),
            var(--md-sys-motion-spatial-fast-duration), var(--md-sys-motion-spatial-fast-duration),
            var(--md-sys-motion-effects-fast-duration), var(--md-sys-motion-effects-fast-duration), var(--md-sys-motion-effects-fast-duration);
        transition-timing-function:
            var(--md-sys-motion-spatial-fast), var(--md-sys-motion-spatial-fast),
            var(--md-sys-motion-spatial-fast), var(--md-sys-motion-spatial-fast),
            var(--md-sys-motion-effects-fast), var(--md-sys-motion-effects-fast), var(--md-sys-motion-effects-fast);
    }

    /* Sizes. */
    [data-md-button][data-md-size='xs'] {
        --md-button-height: 32px;
        --md-button-padding: var(--md-sys-measurement-space200);
        --md-button-gap: var(--md-sys-measurement-space100);
        --md-button-icon: 20px;
        --md-button-outline-width: 1px;
        --md-button-square: var(--md-sys-shape-corner-md);
        --md-button-pressed: var(--md-sys-shape-corner-sm);
        --md-button-narrow: 28px;
        --md-button-default: 32px;
        --md-button-wide: 40px;
    }

    [data-md-button][data-md-size='sm'] {
        --md-button-height: 40px;
        --md-button-padding: var(--md-sys-measurement-space200);
        --md-button-gap: var(--md-sys-measurement-space100);
        --md-button-icon: 20px;
        --md-button-outline-width: 1px;
        --md-button-square: var(--md-sys-shape-corner-md);
        --md-button-pressed: var(--md-sys-shape-corner-sm);
        --md-button-narrow: 32px;
        --md-button-default: 40px;
        --md-button-wide: 52px;
    }

    [data-md-button][data-md-size='sm'][data-md-icon-button] {
        --md-button-icon: 24px;
    }

    [data-md-button][data-md-size='md'] {
        --md-button-height: 56px;
        --md-button-padding: var(--md-sys-measurement-space300);
        --md-button-gap: var(--md-sys-measurement-space100);
        --md-button-icon: 24px;
        --md-button-outline-width: 1px;
        --md-button-square: var(--md-sys-shape-corner-lg);
        --md-button-pressed: var(--md-sys-shape-corner-md);
        --md-button-narrow: 48px;
        --md-button-default: 56px;
        --md-button-wide: 72px;
    }

    [data-md-button][data-md-size='lg'] {
        --md-button-height: 96px;
        --md-button-padding: var(--md-sys-measurement-space600);
        --md-button-gap: 12px;
        --md-button-icon: 32px;
        --md-button-outline-width: 2px;
        --md-button-square: var(--md-sys-shape-corner-xl);
        --md-button-pressed: var(--md-sys-shape-corner-lg);
        --md-button-narrow: 64px;
        --md-button-default: 96px;
        --md-button-wide: 128px;
    }

    [data-md-button][data-md-size='xl'] {
        --md-button-height: 136px;
        --md-button-padding: var(--md-sys-measurement-space800);
        --md-button-gap: var(--md-sys-measurement-space200);
        --md-button-icon: 40px;
        --md-button-outline-width: 3px;
        --md-button-square: var(--md-sys-shape-corner-xl);
        --md-button-pressed: var(--md-sys-shape-corner-lg);
        --md-button-narrow: 104px;
        --md-button-default: 136px;
        --md-button-wide: 184px;
    }

    [data-md-button]:not([data-md-icon-button]) {
        gap: var(--md-button-gap);
        padding-inline: var(--md-button-padding);
    }

    [data-md-button]:not([data-md-icon-button]):is([data-md-size='xs'], [data-md-size='sm']) {
        font: var(--md-sys-typescale-label-lg);
        letter-spacing: var(--md-sys-typescale-label-lg-tracking);
        font-variation-settings: normal;
    }

    [data-md-button]:not([data-md-icon-button])[data-md-size='md'] {
        font: var(--md-sys-typescale-title-md);
        letter-spacing: var(--md-sys-typescale-title-md-tracking);
        font-variation-settings: normal;
    }

    [data-md-button]:not([data-md-icon-button])[data-md-size='lg'] {
        font: var(--md-sys-typescale-headline-sm);
        letter-spacing: var(--md-sys-typescale-headline-sm-tracking);
        font-variation-settings: normal;
    }

    [data-md-button]:not([data-md-icon-button])[data-md-size='xl'] {
        font: var(--md-sys-typescale-headline-lg);
        letter-spacing: var(--md-sys-typescale-headline-lg-tracking);
        font-variation-settings: normal;
    }

    [data-md-button][data-md-icon-button] {
        --md-button-width: var(--md-button-default);

        inline-size: var(--md-button-width);

        &[data-md-width='narrow'] {
            --md-button-width: var(--md-button-narrow);
        }

        &[data-md-width='wide'] {
            --md-button-width: var(--md-button-wide);
        }
    }

    /* Shape, without specificity: a group reshapes the buttons in it. */
    :where([data-md-button]) {
        border-radius: var(--md-sys-shape-corner-full);
    }

    :where([data-md-button]):where([data-md-shape='square'], [data-md-selected='true']) {
        border-radius: var(--md-button-square);
    }

    :where([data-md-button]):where([data-md-icon-button][data-md-shape='square'][data-md-selected='true']) {
        border-radius: var(--md-sys-shape-corner-full);
    }

    :where([data-md-button]):where(:active) {
        border-radius: var(--md-button-pressed);
    }

    /* Colour roles. */
    [data-md-button][data-md-color='secondary'] {
        --md-button-color: var(--md-sys-color-secondary);
        --md-button-on-color: var(--md-sys-color-on-secondary);
        --md-button-tone: var(--md-sys-color-secondary-container);
        --md-button-on-tone: var(--md-sys-color-on-secondary-container);
    }

    [data-md-button][data-md-color='tertiary'] {
        --md-button-color: var(--md-sys-color-tertiary);
        --md-button-on-color: var(--md-sys-color-on-tertiary);
        --md-button-tone: var(--md-sys-color-tertiary-container);
        --md-button-on-tone: var(--md-sys-color-on-tertiary-container);
    }

    [data-md-button][data-md-color='error'] {
        --md-button-color: var(--md-sys-color-error);
        --md-button-on-color: var(--md-sys-color-on-error);
        --md-button-tone: var(--md-sys-color-error-container);
        --md-button-on-tone: var(--md-sys-color-on-error-container);
    }

    [data-md-button][data-md-color='success'] {
        --md-button-color: var(--md-sys-color-success);
        --md-button-on-color: var(--md-sys-color-on-success);
        --md-button-tone: var(--md-sys-color-success-container);
        --md-button-on-tone: var(--md-sys-color-on-success-container);
    }

    [data-md-button][data-md-color='warning'] {
        --md-button-color: var(--md-sys-color-warning);
        --md-button-on-color: var(--md-sys-color-on-warning);
        --md-button-tone: var(--md-sys-color-warning-container);
        --md-button-on-tone: var(--md-sys-color-on-warning-container);
    }

    [data-md-button][data-md-color='info'] {
        --md-button-color: var(--md-sys-color-info);
        --md-button-on-color: var(--md-sys-color-on-info);
        --md-button-tone: var(--md-sys-color-info-container);
        --md-button-on-tone: var(--md-sys-color-on-info-container);
    }

    /* Every colour but primary selects into the colour itself and is quiet in it. */
    [data-md-button]:not([data-md-color='primary']) {
        --md-button-tone-selected: var(--md-button-color);
        --md-button-on-tone-selected: var(--md-button-on-color);
        --md-button-quiet: var(--md-button-color);
    }

    /* Variants. */
    [data-md-button][data-md-variant='filled'] {
        --md-button-container: var(--md-button-color);
        --md-button-label: var(--md-button-on-color);

        &[data-md-selected='false'] {
            --md-button-container: var(--md-sys-color-surface-container);
            --md-button-label: var(--md-sys-color-on-surface-variant);
        }
    }

    [data-md-button][data-md-variant='tonal'] {
        --md-button-container: var(--md-button-tone);
        --md-button-label: var(--md-button-on-tone);

        &[data-md-selected='true'] {
            --md-button-container: var(--md-button-tone-selected);
            --md-button-label: var(--md-button-on-tone-selected);
        }
    }

    [data-md-button][data-md-variant='outlined'] {
        --md-button-label: var(--md-button-quiet);
        --md-button-outline: var(--md-sys-color-outline-variant);

        border: var(--md-button-outline-width) solid var(--md-button-outline);

        &[data-md-selected='true'] {
            --md-button-container: var(--md-sys-color-inverse-surface);
            --md-button-label: var(--md-sys-color-inverse-on-surface);
            --md-button-outline: transparent;
        }
    }

    [data-md-button][data-md-variant='elevated'] {
        --md-button-container: var(--md-sys-color-surface-container-low);
        --md-button-elevation: var(--md-sys-elevation-1);

        &[data-md-selected='true'] {
            --md-button-container: var(--md-button-color);
            --md-button-label: var(--md-button-on-color);
        }
    }

    [data-md-button][data-md-variant='text'][data-md-icon-button]:not([data-md-selected='true']) {
        --md-button-label: var(--md-button-quiet);
    }

    [data-md-button][data-md-variant='text']:not([data-md-icon-button])[data-md-selected='true'] {
        --md-button-container: var(--md-button-tone);
        --md-button-label: var(--md-button-on-tone);
    }

    @media (hover: hover) {
        [data-md-button]:is([data-md-variant='filled'], [data-md-variant='tonal']):hover {
            --md-button-elevation: var(--md-sys-elevation-1);
        }

        [data-md-button][data-md-variant='elevated']:hover {
            --md-button-elevation: var(--md-sys-elevation-2);
        }
    }

    /* Disabled: no state layer, no shadow, M3's disabled colours over whatever the variant set. */
    [data-md-button]:is(:disabled, [aria-disabled='true']) {
        box-shadow: none;
        color: color-mix(in srgb, var(--md-sys-color-on-surface) calc(var(--md-sys-state-disabled-content-opacity) * 100%), transparent);
    }

    [data-md-button]:is([data-md-variant='filled'], [data-md-variant='tonal'], [data-md-variant='elevated'], [data-md-variant='outlined'][data-md-selected='true']):is(:disabled, [aria-disabled='true']) {
        background-color: color-mix(in srgb, var(--md-sys-color-on-surface) 10%, transparent);
    }

    [data-md-button]:disabled {
        cursor: not-allowed;
    }

    [data-md-button][aria-disabled='true'] {
        pointer-events: none;
    }

    /* The glyph's place, and the loading indicator that stands in for it. */
    [data-md-button-icon] {
        display: contents;
    }

    [data-md-button-spinner] {
        align-items: center;
        justify-content: center;
    }

    [data-md-button-spinner] > [data-md-loading] {
        inline-size: var(--md-button-icon);
        block-size: var(--md-button-icon);
        color: currentColor;
    }

    @media (width < 840px) {
        [data-md-button] > [data-md-responsive] {
            display: none;
        }
    }

    @media (width < 600px) {
        [data-md-button][data-md-compact-fab] {
            --md-button-height: 56px;
            --md-button-padding: var(--md-sys-measurement-space200);
            --md-button-gap: var(--md-sys-measurement-space100);

            position: fixed;
            inset-inline-end: var(--md-sys-measurement-space200);
            bottom: calc(var(--material-bottom-bar, 0px) + var(--material-snackbar-height, 0px) + var(--md-sys-measurement-space200));
            z-index: 30;
            border-radius: var(--md-sys-shape-corner-lg);
            background-color: var(--md-sys-color-primary-container);
            color: var(--md-sys-color-on-primary-container);
            box-shadow: var(--md-sys-elevation-3);
            font: var(--md-sys-typescale-title-md);
            letter-spacing: var(--md-sys-typescale-title-md-tracking);
            font-variation-settings: normal;
        }

        [data-md-button][data-md-compact-fab] [data-md-icon] {
            inline-size: 24px;
            block-size: 24px;
        }
    }
}