/* diagram: Mermaid figures in chat answers and their full-screen viewer (js/chat-diagram.js), plus the hidden
   renderer frame. The SVG is shown as an <img>; colours here only frame it (the diagram colours come from the
   same tokens via the theme the script sends to the renderer). */

.diagram-frame {
    position: fixed;
    inset-block-start: 0;
    inset-inline-start: 0;
    width: 100vw;
    height: 100vh;
    visibility: hidden;
    pointer-events: none;
    z-index: -1;
    border: 0;
}

.diagram {
    display: block;
    margin: var(--s-3) 0;
    background-color: var(--ink-1);
    border: 1px solid var(--rule);
    border-radius: var(--r-2);
}

.diagram__bar {
    display: flex;
    align-items: center;
    gap: var(--s-2);
    padding: var(--s-1) var(--s-2) var(--s-1) var(--s-3);
    border-bottom: 1px solid var(--rule);
}

.diagram__label {
    flex: 1 1 auto;
    font: 400 var(--t-xs) / var(--lh-xs) var(--font-mono);
    color: var(--paper-lo);
}

.diagram__btn {
    position: relative;
    padding: 0 var(--s-2);
    font: 400 var(--t-xs) / var(--lh-xs) var(--font-ui);
    color: var(--paper-lo);
    background-color: var(--ink-2);
    border: 1px solid var(--rule-strong);
    border-radius: var(--r-1);
    cursor: pointer;
}

.diagram__btn:hover:not(:disabled),
.diagram__btn:focus-visible {
    color: var(--paper-hi);
}

.diagram__btn:focus-visible,
.diagram__open:focus-visible,
.diagram__source:focus-visible,
.diagram-dialog__scroll:focus-visible {
    outline: var(--focus-w) solid var(--accent);
    outline-offset: var(--focus-offset);
}

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

.diagram__btn[aria-pressed="true"] {
    color: var(--paper-hi);
    border-color: var(--accent);
}

.diagram__view {
    display: flex;
    justify-content: center;
    padding: var(--s-3);
}

.diagram__view[hidden],
.diagram__source[hidden],
.diagram__error[hidden] {
    display: none;
}

/* Reserved height while rendering, so the answer does not jump when the image arrives. */
.diagram[data-state="rendering"] .diagram__view,
.diagram:not([data-state]) .diagram__view {
    min-height: 12rem;
    background: linear-gradient(90deg, transparent, var(--ink-2), transparent) 0 0 / 200% 100% no-repeat;
    animation: diagram-pulse 1.4s linear infinite;
}

@media (max-width: 599.98px) {
    .diagram[data-state="rendering"] .diagram__view,
    .diagram:not([data-state]) .diagram__view {
        min-height: 18rem;
    }
}

@keyframes diagram-pulse {
    from { background-position: 100% 0; }
    to { background-position: -100% 0; }
}

.diagram__open {
    display: block;
    max-width: 100%;
    padding: 0;
    background: none;
    border: 0;
    cursor: zoom-in;
}

.diagram__img {
    display: block;
    max-width: 100%;
    height: auto;
}

.diagram__source {
    margin: 0;
    padding: var(--s-3) var(--s-4);
    overflow-x: auto;
    font: 400 var(--t-sm) / var(--lh-sm) var(--font-mono);
    color: var(--paper);
    tab-size: 4;
    scrollbar-width: thin;
    scrollbar-color: var(--rule-strong) transparent;
}

.diagram__source code {
    padding: 0;
    font: inherit;
    background: none;
    border-radius: 0;
}

.diagram__error {
    margin: 0;
    padding: var(--s-2) var(--s-3);
    overflow-x: auto;
    font: 400 var(--t-xs) / var(--lh-sm) var(--font-mono);
    color: var(--caution);
    white-space: pre-wrap;
    border-top: 1px solid var(--rule);
}


/* Full-screen viewer. */
.diagram-dialog {
    position: fixed;
    inset: 0;
    z-index: var(--z-dialog);
    width: 100vw;
    max-width: none;
    height: 100dvh;
    max-height: none;
    margin: 0;
    padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
    color: var(--paper);
    background-color: var(--ink-1);
    border: 0;
}

.diagram-dialog[open] {
    display: flex;
    flex-direction: column;
}

.diagram-dialog::backdrop {
    background-color: var(--ink-0);
    opacity: .8;
}

.diagram-dialog__bar {
    display: flex;
    align-items: center;
    gap: var(--s-2);
    padding: var(--s-2) var(--s-3);
    border-bottom: 1px solid var(--rule);
}

.diagram-dialog__title {
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
    font: 400 var(--t-sm) / var(--lh-sm) var(--font-ui);
    color: var(--paper-hi);
    text-overflow: ellipsis;
    white-space: nowrap;
}

.diagram-dialog .diagram__btn {
    min-width: var(--tap);
    min-height: var(--tap);
    font-size: var(--t-sm);
    color: var(--paper);
}

.diagram-dialog__scroll {
    display: flex;
    flex: 1 1 auto;
    min-height: 0;
    overflow: auto;
    touch-action: none;
    cursor: grab;
}

.diagram-dialog__img {
    flex: none;
    margin: auto;
    max-width: none;
    user-select: none;
    -webkit-user-drag: none;
}

@media (max-width: 899.98px), (pointer: coarse) {
    .diagram__btn {
        min-height: var(--tap);
        min-width: var(--tap);
    }

    .diagram__bar {
        padding-block: 0;
    }

    .diagram__view {
        padding: var(--s-2);
    }
}

@media (prefers-reduced-motion: reduce) {
    .diagram[data-state="rendering"] .diagram__view,
    .diagram:not([data-state]) .diagram__view {
        animation: none;
        background: none;
    }
}