/* Comment threads (static/js/comments.js) on blog posts and arena
   submissions, on the public pages and in the app; and the box every
   RenderUtils.renderUntrusted render lives in (.mb-untrusted), wherever it
   is used. Self-contained — the app doesn't load public.css — and tokens
   only (var(--…)), so a thread follows the page's theme in light and dark. */

/* ── Untrusted content ──
   The sanitizer already admits no style attribute, no positioning and no
   embeds; this is the second wall. Paint containment clips anything that
   still reaches past the box, and makes it the containing block of any
   fixed-position descendant, so nothing in it can cover the page. */
.mb-untrusted {
    overflow-wrap: anywhere;
    contain: content;
    min-width: 0;
}
.mb-untrusted-plain { white-space: pre-wrap; }
.mb-untrusted > :first-child { margin-top: 0; }
.mb-untrusted > :last-child { margin-bottom: 0; }
.mb-untrusted p { margin: 0 0 0.7em; }
.mb-untrusted h1, .mb-untrusted h2, .mb-untrusted h3,
.mb-untrusted h4, .mb-untrusted h5, .mb-untrusted h6 {
    font-family: var(--font-display); color: var(--text-strong);
    line-height: 1.3; margin: 1em 0 0.4em; font-size: 1em;
}
.mb-untrusted h1 { font-size: 1.25em; }
.mb-untrusted h2 { font-size: 1.15em; }
.mb-untrusted h3 { font-size: 1.05em; }
.mb-untrusted ul, .mb-untrusted ol { margin: 0 0 0.7em; padding-left: 1.5em; }
.mb-untrusted li { margin: 0.15em 0; }
.mb-untrusted li:has(> .mb-task, > p:first-child > .mb-task:first-child) { list-style: none; }
.mb-untrusted .mb-task { display: inline-block; width: 1.3em; margin-left: -1.3em; color: var(--text-3); }
.mb-untrusted blockquote {
    margin: 0 0 0.7em; padding: 0.1em 0 0.1em 0.9em;
    border-left: 3px solid var(--border-4); color: var(--text-3);
}
.mb-untrusted code {
    font-family: var(--font-mono); font-size: 0.86em;
    background: var(--surface-4); padding: 0.1em 0.3em; border-radius: var(--radius-xs);
}
.mb-untrusted pre {
    margin: 0 0 0.7em; padding: 0.7rem 0.9rem; overflow-x: auto;
    background: var(--surface-3); border-radius: var(--radius-md); font-size: 0.86em; line-height: 1.5;
}
.mb-untrusted pre code { background: none; padding: 0; font-size: inherit; }
.mb-untrusted table {
    display: block; max-width: 100%; overflow-x: auto;
    border-collapse: collapse; margin: 0 0 0.7em; font-size: 0.94em;
}
.mb-untrusted th, .mb-untrusted td {
    padding: 0.3em 0.75em; border-bottom: 1px solid var(--border-3);
    /* .mb-untrusted's `anywhere` would let a column shrink to one letter
       (it lowers min-content); the table scrolls sideways instead. */
    overflow-wrap: break-word;
}
.mb-untrusted th:not([align]) { text-align: left; }
.mb-untrusted thead th { border-bottom: 2px solid var(--border-4); font-weight: 650; color: var(--text-strong); }
.mb-untrusted hr { border: none; border-top: 1px solid var(--border-3); margin: 1em 0; }
.mb-untrusted img { max-width: 100%; height: auto; border-radius: var(--radius-sm); vertical-align: middle; }
.mb-untrusted a:not(.mb-xref) {
    color: var(--link); text-decoration: underline;
    text-decoration-thickness: 1px; text-underline-offset: 2px;
}
.mb-untrusted .math-display { margin: 0.5em 0; overflow-x: auto; overflow-y: hidden; }
.mb-untrusted .katex-display { margin: 0.25em 0; }
.mb-untrusted .mb-theorem { margin: 0.7em 0; }

/* ── The thread ── */
.cm {
    font-family: var(--font-ui); font-size: 0.95rem; line-height: 1.55; color: var(--text-1);
}
.cm-sr-only {
    position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
.cm-head { margin: 0 0 1rem; }
.cm-title {
    margin: 0; font-family: var(--font-display);
    font-size: 1.15rem; font-weight: 650; letter-spacing: -0.01em; color: var(--text-strong);
}
.cm-title:focus { outline: none; }

/* Notices: the approval queue, a closed thread, a failed load. */
.cm-notices { display: flex; flex-direction: column; gap: 0.5rem; margin-bottom: 1rem; }
.cm-notices:empty { display: none; }
.cm-notice {
    padding: 0.6rem 0.9rem; border-radius: var(--radius-lg); font-size: 0.87rem;
    background: var(--surface-2); color: var(--text-2); border: 1px solid var(--border-3);
}
.cm-notice-warning { background: var(--warning-bg); color: var(--warning-deep); border-color: var(--warning-border); }
.cm-notice-error {
    display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.5rem 0.75rem;
    background: var(--danger-bg); color: var(--danger-strong); border-color: var(--danger-border);
}
.cm-notice-closed strong { color: var(--text-strong); }

/* Buttons and links */
.cm-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 0.35rem;
    padding: 0.45rem 0.95rem; border: 1px solid transparent; border-radius: var(--radius-md);
    font: inherit; font-size: 0.85rem; font-weight: 600; line-height: 1.2;
    text-decoration: none; white-space: nowrap; cursor: pointer;
    transition: background 0.15s, border-color 0.15s, color 0.15s, opacity 0.15s;
}
.cm-btn-sm { padding: 0.36rem 0.8rem; font-size: 0.82rem; }
.cm-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.cm-btn:disabled { opacity: 0.45; cursor: default; }
.cm .cm-btn-primary { background: var(--accent); color: var(--text-inverse); }
.cm .cm-btn-primary:hover:not(:disabled) { background: var(--accent-hover); color: var(--text-inverse); }
.cm .cm-btn-secondary { background: var(--surface-1); color: var(--text-1); border-color: var(--border-4); }
.cm .cm-btn-secondary:hover:not(:disabled) { background: var(--surface-3); color: var(--text-strong); }
.cm .cm-btn-ghost { background: none; color: var(--text-3); }
.cm .cm-btn-ghost:hover:not(:disabled) { background: var(--surface-3); color: var(--text-strong); }
.cm .cm-btn-danger { background: var(--danger-btn); color: var(--text-inverse); }
.cm .cm-btn-danger:hover:not(:disabled) { background: var(--danger); color: var(--text-inverse); }

.cm-link {
    border: none; background: none; padding: 0.15rem 0; cursor: pointer;
    font: inherit; font-weight: 600; color: var(--text-3); border-radius: var(--radius-xs);
    transition: color 0.15s;
}
.cm-link:hover:not(:disabled) { color: var(--text-strong); }
.cm-link:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.cm-link:disabled { opacity: 0.5; cursor: default; }
.cm-link-strong { color: var(--accent-deep); }
.cm-link-strong:hover:not(:disabled) { color: var(--accent-hover); }
.cm-link-danger:hover:not(:disabled) { color: var(--danger-strong); }

/* The gate shown to readers who can't write */
.cm-compose-slot { margin-bottom: 1.4rem; }
.cm-compose-slot:empty { display: none; }
.cm-gate {
    display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
    gap: 0.6rem 1rem; padding: 0.8rem 1rem;
    background: var(--surface-1); border: 1px dashed var(--border-5); border-radius: var(--radius-lg);
    color: var(--text-2); font-size: 0.9rem;
}
.cm-gate-actions { display: flex; gap: 0.5rem; }

/* Avatars: initials on one of the tag hues, picked by user id. */
.cm-avatar {
    flex-shrink: 0; display: inline-flex; align-items: center; justify-content: center;
    width: 34px; height: 34px; border-radius: 50%;
    font-size: 0.76rem; font-weight: 700; letter-spacing: 0.02em; user-select: none;
    background: var(--tag-blue-bg); color: var(--tag-blue-fg);
}
.cm-avatar[data-hue="1"] { background: var(--tag-green-bg); color: var(--tag-green-fg); }
.cm-avatar[data-hue="2"] { background: var(--tag-amber-bg); color: var(--tag-amber-fg); }
.cm-avatar[data-hue="3"] { background: var(--tag-pink-bg); color: var(--tag-pink-fg); }
.cm-avatar[data-hue="4"] { background: var(--tag-violet-bg); color: var(--tag-violet-fg); }
.cm-avatar[data-hue="5"] { background: var(--tag-teal-bg); color: var(--tag-teal-fg); }
.cm-avatar[data-hue="6"] { background: var(--tag-slate-bg); color: var(--tag-slate-fg); }
.cm-avatar[data-hue="7"] { background: var(--tag-red-bg); color: var(--tag-red-fg); }
.cm-avatar-blank { background: var(--surface-3); border: 1px dashed var(--border-5); }

/* The composer: Write / Preview tabs over the box, hints and buttons under it */
.cm-composer { display: flex; align-items: flex-start; gap: 0.75rem; }
.cm-composer-avatar { display: flex; padding-top: 0.15rem; }
.cm-editor {
    flex: 1; min-width: 0;
    background: var(--surface-1); border: 1px solid var(--border-4); border-radius: var(--radius-lg);
    transition: border-color 0.15s, box-shadow 0.15s;
}
.cm-editor:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-bg); }
.cm-tabs {
    display: flex; gap: 0.15rem; padding: 0.35rem 0.45rem 0;
    background: var(--surface-2); border-bottom: 1px solid var(--border-3);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.cm-tab {
    margin-bottom: -1px; padding: 0.32rem 0.75rem;
    border: 1px solid transparent; border-radius: var(--radius-md) var(--radius-md) 0 0;
    background: none; cursor: pointer;
    font: inherit; font-size: 0.8rem; font-weight: 600; color: var(--text-3);
}
.cm-tab:hover { color: var(--text-strong); }
.cm-tab[aria-selected="true"] {
    background: var(--surface-1); color: var(--text-strong);
    border-color: var(--border-3); border-bottom-color: var(--surface-1);
}
.cm-tab:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.cm-input {
    display: block; width: 100%; min-height: 4.6rem; margin: 0; padding: 0.65rem 0.8rem;
    border: none; outline: none; resize: none; background: transparent; color: var(--text-1);
    font: inherit; font-size: 0.93rem; line-height: 1.5;
}
/* The box around it shows focus (.cm-editor:focus-within); themes outline a
   focused textarea, which would draw a second ring inside the first. */
.cm-input:focus { outline: none; }
.cm-item-compose .cm-input, .cm-main .cm-input { min-height: 3.4rem; }
.cm-input::placeholder { color: var(--text-5); }
/* Its height is the textarea's, set as it opens (comments.js), so Write ↔
   Preview never moves the thread; the minimums match the textarea's. */
.cm-preview {
    min-height: 4.6rem; max-height: 50vh; overflow-y: auto; padding: 0.65rem 0.8rem;
    font-family: var(--font-reading); font-size: 1rem; line-height: 1.62;
}
.cm-item-compose .cm-preview, .cm-main .cm-preview { min-height: 3.4rem; }
.cm-preview:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.cm-preview-empty { margin: 0; color: var(--text-3); font-family: var(--font-ui); font-size: 0.9rem; }
.cm-foot {
    display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem 0.75rem;
    padding: 0.45rem 0.5rem 0.45rem 0.8rem; border-top: 1px solid var(--border-2);
}
.cm-hint { flex: 1 1 12rem; min-width: 0; font-size: 0.76rem; color: var(--text-3); }
.cm-hint kbd {
    display: inline-block; margin: 0 0.1rem; padding: 0 0.3rem;
    font-family: var(--font-ui); font-size: 0.7rem; line-height: 1.5; color: var(--text-3);
    background: var(--surface-2); border: 1px solid var(--border-4); border-bottom-width: 2px;
    border-radius: var(--radius-xs);
}
@media (hover: none) { .cm-hint-keys { display: none; } }
.cm-counter { font-size: 0.76rem; color: var(--text-3); font-variant-numeric: tabular-nums; }
.cm-counter-over { color: var(--danger-strong); font-weight: 650; }
.cm-error { flex-basis: 100%; order: 10; font-size: 0.82rem; color: var(--danger-strong); }
.cm-counter:empty, .cm-error:empty { display: none; }
.cm-buttons { display: flex; gap: 0.4rem; margin-left: auto; }

/* Comments */
.cm-list, .cm-replies { list-style: none; margin: 0; padding: 0; }
.cm-list > .cm-item { padding: 1.1rem 0; }
.cm-list > .cm-item:first-child { padding-top: 0.2rem; }
.cm-list > .cm-item + .cm-item { border-top: 1px solid var(--border-2); }
.cm-comment { display: flex; align-items: flex-start; gap: 0.75rem; border-radius: var(--radius-lg); }
.cm-comment:focus { outline: none; }
.cm-comment:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.cm-main { flex: 1; min-width: 0; }
.cm-meta {
    display: flex; flex-wrap: wrap; align-items: center; gap: 0.15rem 0.5rem;
    margin-bottom: 0.2rem; font-size: 0.85rem; line-height: 1.4;
}
.cm-author { font-weight: 650; color: var(--text-strong); overflow-wrap: anywhere; }
.cm .cm-time { font-size: 0.8rem; color: var(--text-3); text-decoration: none; }
.cm .cm-time:hover { color: var(--text-3); text-decoration: underline; }
.cm-edited { font-size: 0.78rem; color: var(--text-3); }
.cm-badge {
    display: inline-flex; align-items: center; padding: 0.04rem 0.45rem;
    border-radius: var(--radius-pill); white-space: nowrap;
    font-size: 0.68rem; font-weight: 650; letter-spacing: 0.02em;
    background: var(--surface-4); color: var(--text-3);
}
.cm-badge-accent { background: var(--accent-bg); color: var(--accent-deep); }
.cm-badge-warning { background: var(--warning-bg); color: var(--warning-deep); }
.cm-badge-muted { background: var(--surface-4); color: var(--text-3); }
.cm-body { font-family: var(--font-reading); font-size: 1rem; line-height: 1.62; color: var(--text-1); }
.cm-is-hidden .cm-body { opacity: 0.6; }
.cm-placeholder { margin: 0.35rem 0 0.1rem; font-size: 0.9rem; font-style: italic; color: var(--text-3); }
.cm-actions {
    display: flex; flex-wrap: wrap; align-items: center; gap: 0.1rem 0.95rem;
    margin-top: 0.35rem; font-size: 0.8rem;
}
.cm-actions-empty { display: none; }
.cm-action-error { font-weight: 500; color: var(--danger-strong); }
.cm-action-error:empty { display: none; }
.cm-actions.cm-confirm {
    gap: 0.4rem 0.5rem; margin-top: 0.5rem; padding: 0.4rem 0.45rem 0.4rem 0.75rem;
    background: var(--danger-wash); border: 1px solid var(--danger-border); border-radius: var(--radius-md);
}
.cm-confirm-text { flex: 1 1 14rem; font-weight: 600; color: var(--danger-deep); }
.cm-confirm-buttons { display: flex; gap: 0.4rem; margin-left: auto; }
.cm-actions.cm-confirm .cm-action-error { flex-basis: 100%; }
.cm-main > .cm-composer { margin-top: 0.4rem; }

/* Replies: one level, hung from a line under the parent's avatar so they
   line up with its text. */
.cm-replies {
    display: flex; flex-direction: column; gap: 1rem;
    margin: 0.95rem 0 0 16px; padding-left: 28px; border-left: 2px solid var(--border-2);
}
.cm-item-reply .cm-avatar { width: 28px; height: 28px; font-size: 0.68rem; }
.cm-item-compose .cm-composer-avatar { padding-top: 0.1rem; }

.cm-loading { margin: 0; font-size: 0.9rem; color: var(--text-3); }
.cm-empty {
    margin: 0; padding: 1.4rem 1rem; text-align: center;
    font-size: 0.9rem; color: var(--text-3);
    border: 1px dashed var(--border-4); border-radius: var(--radius-lg);
}

/* Arriving from an email's #comment-N link */
@keyframes cm-flash {
    from { background: var(--accent-bg); box-shadow: 0 0 0 6px var(--accent-bg); }
    to { background: transparent; box-shadow: 0 0 0 6px transparent; }
}
.cm-flash { animation: cm-flash 2.4s ease-out; }

@media (max-width: 520px) {
    .cm-composer > .cm-composer-avatar, .cm-hint-keys { display: none; }
    .cm-avatar { width: 30px; height: 30px; font-size: 0.7rem; }
    .cm-comment { gap: 0.6rem; }
    .cm-replies { margin-left: 14px; padding-left: 12px; }
    .cm-foot { padding-left: 0.65rem; }
    .cm-gate { padding: 0.75rem 0.85rem; }
}
@media (prefers-reduced-motion: reduce) {
    .cm-flash { animation: none; }
    .cm-editor, .cm-btn, .cm-link { transition: none; }
}