/* The page takes the selected theme's editor colors (--page-bg, --page-fg, set by js/playground.js); every other
   color is mixed from those two so the chrome follows light and dark themes alike. */
:root {
    --page-bg: #1e1e1e;
    --page-fg: #d4d4d4;
    --muted: color-mix(in srgb, var(--page-fg) 62%, var(--page-bg));
    --line: color-mix(in srgb, var(--page-fg) 16%, var(--page-bg));
    --panel: color-mix(in srgb, var(--page-fg) 5%, var(--page-bg));
    --control: color-mix(in srgb, var(--page-fg) 9%, var(--page-bg));
    --accent: color-mix(in srgb, var(--page-fg) 28%, var(--page-bg));
    --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
    --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --code-size: 13.5px;
    --code-line: 1.55;
    --code-pad: 16px;
    color-scheme: light dark;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    background: var(--page-bg);
    color: var(--page-fg);
    font: 14px/1.45 var(--sans);
}

a {
    color: inherit;
}

code {
    font-family: var(--mono);
}

.loading {
    display: grid;
    place-items: center;
    min-height: 100vh;
    color: var(--muted);
}

.page {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Toolbar */

.toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: end;
    gap: 10px 14px;
    padding: 10px 16px;
    border-bottom: 1px solid var(--line);
}

.brand {
    display: flex;
    align-items: center;
    gap: 8px;
    align-self: center;
    margin-right: 6px;
    font-weight: 600;
    font-size: 16px;
    text-decoration: none;
}

.brand-sub {
    font-weight: 400;
    color: var(--muted);
}

.field {
    display: flex;
    flex-direction: column;
    gap: 2px;
    font-size: 11px;
    color: var(--muted);
}

select, button {
    font: 13px var(--sans);
    color: var(--page-fg);
    background: var(--control);
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 5px 9px;
}

select {
    min-width: 150px;
    max-width: 230px;
}

option, optgroup {
    background: var(--page-bg);
    color: var(--page-fg);
}

button {
    cursor: pointer;
}

button:hover:not(:disabled), select:hover {
    border-color: var(--accent);
}

button:disabled {
    opacity: .5;
    cursor: default;
}

select:focus-visible, button:focus-visible, .editor-input:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 1px;
}

.segmented {
    display: flex;
}

.segmented button {
    border-radius: 0;
    max-width: 160px;
}

.segmented .clip {
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.segmented button:first-child {
    border-radius: 6px 0 0 6px;
}

.segmented button:last-child {
    border-radius: 0 6px 6px 0;
    border-left: 0;
}

.segmented button.active {
    background: var(--accent);
}

.actions {
    display: flex;
    gap: 8px;
    margin-left: auto;
}

/* Tooltips: data-tip on a control, shown under it on hover and on keyboard focus. */

[data-tip] {
    position: relative;
}

[data-tip]::after {
    content: attr(data-tip);
    position: absolute;
    top: calc(100% + 6px);
    left: 50%;
    z-index: 10;
    width: max-content;
    max-width: 260px;
    padding: 5px 8px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: var(--page-bg);
    color: var(--page-fg);
    font: 12px/1.35 var(--sans);
    font-weight: 400;
    text-align: left;
    white-space: normal;
    box-shadow: 0 4px 12px rgb(0 0 0 / .25);
    transform: translateX(-50%);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .12s, visibility .12s;
}

[data-tip]:hover::after, [data-tip]:focus-visible::after {
    opacity: 1;
    visibility: visible;
    transition-delay: .3s;
}

/* The actions sit at the right edge and the disclosure at the bottom left: keep their tooltips on screen. */
.actions [data-tip]::after {
    left: auto;
    right: 0;
    transform: none;
}

.disclosure[data-tip]::after {
    top: auto;
    bottom: calc(100% + 4px);
    left: 0;
    transform: none;
}

/* Editor: a transparent textarea over the highlighted pre, same metrics, scroll synchronized by script. */

.workspace {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 340px;
    flex: 1;
    min-height: 0;
}

.editor {
    position: relative;
    height: calc(100vh - 150px);
    min-height: 320px;
    border-right: 1px solid var(--line);
}

.editor-output, .editor-input {
    position: absolute;
    inset: 0;
}

.editor-output .tint, .editor-input {
    margin: 0;
    padding: var(--code-pad);
    font-family: var(--mono);
    font-size: var(--code-size);
    line-height: var(--code-line);
    tab-size: 4;
    white-space: pre;
    letter-spacing: normal;
    font-variant-ligatures: none;
}

.editor-output .tint {
    height: 100%;
    overflow: hidden;
    /* Room below the last line, so the pre can scroll as far as the textarea. */
    padding-bottom: calc(var(--code-pad) + 3em);
}

.editor-output .tint code {
    font: inherit;
}

.editor-input {
    width: 100%;
    height: 100%;
    border: 0;
    border-radius: 0;
    resize: none;
    overflow: auto;
    color: transparent;
    -webkit-text-fill-color: transparent;
    background: transparent;
    caret-color: var(--page-fg);
    outline: none;
}

.editor-input::selection {
    background: color-mix(in srgb, var(--page-fg) 22%, transparent);
}

/* Inspector */

.inspector {
    padding: 12px 16px 20px;
    overflow: auto;
    height: calc(100vh - 150px);
    min-height: 320px;
    background: var(--panel);
    font-size: 13px;
}

.inspector h2 {
    margin: 0 0 8px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--muted);
}

.inspector h3 {
    margin: 16px 0 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--muted);
}

.hint {
    color: var(--muted);
}

.token-text {
    padding: 6px 10px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: var(--page-bg);
    overflow-x: auto;
    white-space: pre;
}

.facts, .rules {
    display: grid;
    grid-template-columns: max-content minmax(0, 1fr);
    gap: 4px 12px;
    margin: 10px 0 0;
}

dt {
    color: var(--muted);
}

dd {
    margin: 0;
    overflow-wrap: anywhere;
}

.swatch {
    display: inline-block;
    width: 11px;
    height: 11px;
    margin-right: 6px;
    vertical-align: -1px;
    border: 1px solid var(--line);
    border-radius: 2px;
}

.scopes {
    margin: 0;
    padding-left: 22px;
    font-size: 12.5px;
}

.scopes li {
    overflow-wrap: anywhere;
    color: var(--muted);
}

.scopes li.innermost {
    color: var(--page-fg);
    font-weight: 600;
}

.rule-meta {
    display: block;
    color: var(--muted);
    font-size: 12px;
}

/* Status line */

.status {
    display: flex;
    flex-wrap: wrap;
    gap: 4px 18px;
    padding: 6px 16px;
    border-top: 1px solid var(--line);
    font-size: 12px;
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

.status .message {
    color: var(--page-fg);
}

/* HTML output */

.html-output {
    padding: 6px 16px 24px;
    border-top: 1px solid var(--line);
}

.disclosure {
    background: none;
    border: 0;
    padding: 6px 0;
    font-weight: 600;
}

.chevron {
    display: inline-block;
    width: 1em;
}

.html-output h3 {
    margin: 12px 0 6px;
    font-size: 12px;
    color: var(--muted);
}

.source {
    margin: 0;
    max-height: 420px;
    overflow: auto;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: var(--panel);
    font: 12px/1.5 var(--mono);
    white-space: pre;
}

/* Narrow screens: the inspector goes under the editor. */

@media (max-width: 860px) {
    .workspace {
        grid-template-columns: minmax(0, 1fr);
    }

    .editor {
        height: 60vh;
        border-right: 0;
        border-bottom: 1px solid var(--line);
    }

    .inspector {
        height: auto;
        min-height: 0;
    }

    .actions {
        margin-left: 0;
    }
}

/* Blazor's error bar. */

#blazor-error-ui {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 8px 16px;
    background: #ffd54f;
    color: #000;
    z-index: 1000;
}

#blazor-error-ui .dismiss {
    cursor: pointer;
    position: absolute;
    right: 12px;
    top: 8px;
}