/* Hallmark · redesign: USA Standard reference · compound catalogue + research profiles
 * palette: navy / cream / red · typography: restrained local Avenir Next sans
 * navigation: four destinations · no sidebar · no repeated chat panels
 * user-directed revision of the first forum prototype, 2026-10-26
 * pre-emit critique: P5 H4 E4 S5 R5 V5 */
* { box-sizing: border-box; }
html { overflow-x: clip; scroll-padding-top: 1rem; }
body { margin: 0; overflow-x: clip; background: var(--color-paper); color: var(--color-ink); font-family: var(--font-body); font-size: 15px; line-height: 1.55; -webkit-font-smoothing: antialiased; }
button, input, textarea, select { font: inherit; }
button, a, input, select, textarea { -webkit-tap-highlight-color: var(--color-transparent); }
button { cursor: pointer; }
button, a { touch-action: manipulation; }
button:disabled, input:disabled { opacity: .58; cursor: not-allowed; }
a { color: inherit; text-underline-offset: .2em; }
svg { flex-shrink: 0; }
img, svg { max-width: 100%; }
::selection { background: var(--color-paper-3); color: var(--color-accent); }
:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 3px; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { min-width: 0; overflow-wrap: anywhere; }
h1 { font-family: var(--font-display); font-size: var(--text-display); font-weight: 500; line-height: 1.16; letter-spacing: -.035em; }
h2 { font-family: var(--font-display); font-weight: 500; line-height: 1.28; letter-spacing: -.018em; }
h3 { font-size: var(--text-md); font-weight: 600; line-height: 1.35; }
input, textarea, select { width: 100%; min-width: 0; border: 1px solid var(--color-rule-strong); border-radius: var(--radius); background: var(--color-surface); color: var(--color-ink); min-height: 48px; padding: 11px 12px; outline-offset: 2px; }
input::placeholder, textarea::placeholder { color: var(--color-muted); opacity: 1; }
textarea { resize: vertical; min-height: 108px; line-height: 1.55; }
input[aria-invalid="true"], textarea[aria-invalid="true"] { border-color: var(--color-error); }
label { display: block; margin-bottom: 7px; font-weight: 600; font-size: .875rem; }
form > label:not(:first-child) { margin-top: 18px; }
.icon { width: 20px; height: 20px; vertical-align: middle; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: clip; clip-path: inset(50%); white-space: nowrap; border: 0; }
.skip-link { position: absolute; top: -80px; left: 16px; z-index: 10; padding: 12px; background: var(--color-accent); color: var(--color-accent-ink); }
.skip-link:focus { top: 10px; }
.button { display: inline-flex; gap: 9px; justify-content: center; align-items: center; min-height: 48px; padding: 11px 17px; border: 1px solid var(--color-transparent); border-radius: var(--radius); font-size: .875rem; font-weight: 600; line-height: 1.3; white-space: nowrap; text-decoration: none; transition: background-color var(--duration) var(--ease-out), color var(--duration) var(--ease-out); }
.button:active:not(:disabled) { transform: translateY(1px); }
.button-primary { background: var(--color-accent); color: var(--color-accent-ink); }
.button-outline { background: var(--color-transparent); color: var(--color-ink); border-color: var(--color-rule-strong); }
.button-quiet { background: var(--color-transparent); color: var(--color-ink); }
.text-button { display: inline-flex; min-height: 48px; align-items: center; background: var(--color-transparent); color: var(--color-accent); border: 0; padding: 10px 8px; font-size: .875rem; text-decoration: underline; text-underline-offset: .22em; white-space: nowrap; }
.text-link { min-height: 48px; display: inline-flex; align-items: center; gap: 9px; color: var(--color-accent); font-size: .875rem; font-weight: 600; text-decoration: none; white-space: nowrap; }
.text-link .icon { width: 17px; height: 17px; }
.full-width { width: 100%; }
.muted { color: var(--color-muted); }
.account-button span { max-width: 74px; overflow: clip; text-overflow: ellipsis; }
.main-content { min-width: 0; outline: none; }
.page-heading { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 20px; margin-bottom: 24px; }
.page-heading p { margin-top: 10px; max-width: 46ch; color: var(--color-muted); font-size: .9375rem; line-height: 1.6; }
.page-heading > .button { min-height: 48px; padding-block: 10px; }
.heading-note { color: var(--color-muted); font-size: .875rem; white-space: nowrap; }
.notice { display: none; }
.notice.is-visible { display: block; border: 1px solid var(--color-rule); border-radius: var(--radius); background: var(--color-success-paper); color: var(--color-success); padding: 12px 16px; margin-bottom: 24px; }
.notice.notice-error { background: var(--color-error-paper); color: var(--color-error); }
.mobile-categories { margin-bottom: 16px; }
.mobile-categories label { font-size: .8125rem; }
.inline-controls { display: flex; gap: 8px; }
.inline-controls select { flex: 1; }
.search-form { position: relative; display: flex; width: 100%; }
.search-form input { padding-inline: 43px 48px; border-color: var(--color-rule); background: var(--color-surface); color: var(--color-ink); min-height: 50px; }
.search-icon { position: absolute; inset-inline-start: 14px; top: 14px; color: var(--color-muted); pointer-events: none; }
.search-submit { position: absolute; right: 1px; top: 1px; min-width: 48px; height: 48px; border: 0; border-radius: var(--radius); background: var(--color-transparent); color: var(--color-muted); }
.listing-toolbar { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-top: 22px; border-bottom: 1px solid var(--color-rule); }
.listing-tabs { display: flex; gap: 20px; }
.listing-tabs a { display: flex; align-items: center; min-height: 48px; color: var(--color-muted); font-size: .875rem; text-decoration: none; white-space: nowrap; border-bottom: 2px solid var(--color-transparent); }
.listing-tabs a.is-current { color: var(--color-ink); border-bottom-color: var(--color-accent); font-weight: 600; }
.listing-label { display: none; font-size: .75rem; color: var(--color-muted); text-align: right; }
.thread-row { display: grid; grid-template-columns: minmax(0, 1fr) 48px; column-gap: 10px; padding: 24px 0; border-bottom: 1px solid var(--color-rule); }
.thread-content { min-width: 0; }
.thread-category { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; font-size: .75rem; line-height: 1.5; margin-bottom: 8px; }
.thread-category a { color: var(--color-accent); text-decoration: none; }
.featured-label { color: var(--color-muted); font-size: .6875rem; border: 1px solid var(--color-rule); padding: 1px 7px; border-radius: 3px; white-space: nowrap; }
.thread-row h2 { font-family: var(--font-body); font-size: 1.0625rem; font-weight: 600; line-height: 1.45; letter-spacing: -.015em; }
.thread-row h2 a { display: block; min-height: 48px; text-decoration: none; }
.thread-preview { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: clip; margin-top: 7px; color: var(--color-muted); font-size: .875rem; line-height: 1.6; }
.thread-meta { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-top: 14px; color: var(--color-muted); font-size: .6875rem; }
.thread-meta time { white-space: nowrap; }
.meta-dot { display: none; }
.author-mark { display: inline-flex; justify-content: center; align-items: center; width: 24px; height: 24px; border-radius: 50%; background: var(--color-paper-2); color: var(--color-ink-2); font-size: .6875rem; flex-shrink: 0; font-weight: 600; }
.editorial-mark { font-family: var(--font-display); font-size: .875rem; background: var(--color-paper-3); color: var(--color-accent); font-weight: 700; }
.reply-count { display: flex; flex-direction: column; align-items: center; align-self: center; min-width: 48px; min-height: 48px; color: var(--color-muted); text-decoration: none; font-size: .8125rem; line-height: 1.4; font-variant-numeric: tabular-nums; gap: 4px; }
.reply-count .icon { width: 18px; height: 18px; }
.reply-count-label { display: none; font-size: .6875rem; }
.community-note { display: flex; align-items: flex-start; gap: 12px; color: var(--color-muted); font-size: .8125rem; margin-top: 24px; line-height: 1.65; }
.community-note > .icon { margin-top: 2px; }
.community-note a { color: var(--color-ink-2); }
.ask-form label { font-size: .75rem; font-weight: 500; color: var(--color-ink-2); }
.ask-form textarea { border-color: var(--color-rule-strong); font-size: .875rem; padding: 13px; min-height: 112px; }
.ask-form-bottom { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; margin-top: 12px; }
.ask-form-bottom > span { font-size: .6875rem; color: var(--color-muted); }
.ask-form .button { min-height: 48px; padding: 10px 13px; font-size: .8125rem; }
.ask-form .button .icon { width: 16px; height: 16px; }
.empty-state { padding: 36px 0; color: var(--color-muted); }
.empty-state > .icon { margin-bottom: 14px; width: 28px; height: 28px; }
.empty-state h2 { font-size: 1.5rem; color: var(--color-ink); margin-bottom: 10px; }
.empty-state p { max-width: 48ch; font-size: .875rem; }
.empty-state .text-link { margin-top: 12px; }
.library-list { margin-top: 16px; }
.library-item { border-bottom: 1px solid var(--color-rule); padding: 28px 0 22px; }
.library-item h2 { font-size: 1.625rem; margin-block: 9px; }
.library-item h2 a { display: block; min-height: 48px; text-decoration: none; }
.library-item > p { font-size: .9375rem; line-height: 1.7; color: var(--color-muted); max-width: 60ch; }
.library-item > .text-link { font-size: .8125rem; margin-top: 10px; }
.article-kind { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; color: var(--color-accent); font-size: .75rem; }
.article-kind > span { color: var(--color-muted); }
.back-link { display: inline-flex; min-height: 48px; align-items: center; margin-top: -12px; margin-bottom: 24px; font-size: .8125rem; text-decoration: none; color: var(--color-muted); white-space: nowrap; }
.article-view h1 { margin-top: 16px; line-height: 1.18; }
.article-summary { font-size: 1.0625rem; color: var(--color-ink-2); line-height: 1.7; margin-top: 20px; max-width: 60ch; }
.article-byline { display: flex; flex-wrap: wrap; gap: 10px; color: var(--color-muted); font-size: .75rem; padding-block: 22px; border-bottom: 1px solid var(--color-rule); margin-bottom: 30px; }
.prose { color: var(--color-ink-2); font-size: 1rem; line-height: 1.85; overflow-wrap: anywhere; }
.prose p { margin-bottom: 1.25em; }
.prose p:last-child { margin-bottom: 0; }
.prose section + section { margin-top: 32px; }
.prose h2 { color: var(--color-ink); font-size: 1.625rem; margin-bottom: 14px; }
.article-sources { margin-top: 36px; padding-top: 24px; border-top: 1px solid var(--color-rule); }
.article-sources > h2 { font-size: 1.625rem; margin-bottom: 14px; }
.source-list { padding: 0; margin: 0; list-style: none; }
.source-list li { display: flex; gap: 12px; padding-block: 12px; border-bottom: 1px solid var(--color-rule); font-size: .875rem; }
.source-list li:last-child { border-bottom: 0; }
.source-list li > div { min-width: 0; }
.source-number { display: flex; align-items: center; justify-content: center; width: 24px; height: 24px; flex-shrink: 0; background: var(--color-paper-3); color: var(--color-accent); border-radius: 3px; font-size: .6875rem; font-variant-numeric: tabular-nums; }
.source-list a { display: block; min-height: 48px; color: var(--color-accent); overflow-wrap: anywhere; }
.source-list .icon { width: 12px; height: 12px; margin-inline-start: 3px; }
.source-type { display: block; color: var(--color-muted); font-size: .6875rem; margin-top: 4px; }
.article-view > .text-link { margin-top: 24px; }
.topic-view h1 { margin-block: 12px 20px; }
.topic-byline, .reply-heading { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: .8125rem; }
.topic-byline time, .reply-heading time { color: var(--color-muted); font-weight: 400; font-size: .6875rem; }
.topic-body { margin-top: 28px; }
.report-button { padding-inline: 0; margin-top: 8px; font-size: .6875rem; color: var(--color-muted); }
.replies { padding-top: 28px; margin-top: 22px; border-top: 1px solid var(--color-rule); }
.replies > h2 { font-size: 1.625rem; margin-bottom: 20px; }
.replies > .muted { font-size: .875rem; }
.reply { padding-block: 24px; border-bottom: 1px solid var(--color-rule); }
.reply:first-of-type { padding-top: 6px; }
.reply > .prose { margin-top: 16px; }
.reply-compose { padding: 24px 20px; margin-top: 30px; background: var(--color-paper-2); color: var(--color-ink); border-radius: var(--radius); }
.reply-compose h3 { font-family: var(--font-display); font-size: 1.5rem; font-weight: 500; }
.reply-compose > p { color: var(--color-muted); font-size: .875rem; margin-top: 6px; }
.reply-compose > .button { margin-top: 18px; }
.form-bottom { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; margin-top: 14px; }
.form-bottom > span { font-size: .75rem; }
.ask-workspace { max-width: 780px; }
.ask-intro-compact { color: var(--color-muted); font-size: .875rem; max-width: 60ch; margin-bottom: 24px; }
.ask-intro { padding-block: 24px 28px; border-top: 1px solid var(--color-rule); }
.large-genie-symbol { display: inline-flex; align-items: center; justify-content: center; width: 48px; height: 48px; background: var(--color-paper-3); color: var(--color-accent); border-radius: 50%; margin-bottom: 16px; }
.large-genie-symbol .icon { width: 25px; height: 25px; }
.ask-intro h2 { font-size: 1.75rem; margin-bottom: 12px; }
.ask-intro p { max-width: 58ch; color: var(--color-muted); font-size: .9375rem; line-height: 1.8; }
.ask-workspace .ask-form { background: var(--color-paper-2); color: var(--color-ink); padding: 20px; border: 1px solid var(--color-rule); border-radius: 8px; }
.ask-workspace .ask-form label { font-size: .875rem; }
.ask-workspace .ask-form textarea { font-size: 1rem; }
.ask-workspace .ask-form .button { min-height: 48px; font-size: .875rem; }
.question-starters { display: flex; flex-direction: column; margin-top: 24px; gap: 8px; }
.question-starters > span { font-size: .75rem; color: var(--color-muted); margin-bottom: 2px; }
.starter-button { display: flex; align-items: center; justify-content: space-between; text-align: start; min-height: 48px; padding: 11px 0; border: 0; border-bottom: 1px solid var(--color-rule); background: var(--color-transparent); color: var(--color-ink-2); font-size: .875rem; gap: 12px; white-space: nowrap; }
.starter-button .icon { width: 17px; height: 17px; color: var(--color-accent); }
.ask-footnote { color: var(--color-muted); font-size: .75rem; margin-top: 30px; max-width: 64ch; }
.chat-answer { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--color-rule); }
.answer-heading { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; font-size: .875rem; margin-bottom: 14px; color: var(--color-accent); }
.answer-heading > span { font-size: .6875rem; color: var(--color-muted); }
.answer-prose { font-size: .875rem; line-height: 1.8; }
.answer-sources { margin-top: 14px; }
.answer-sources li { font-size: .75rem; gap: 8px; }
.answer-feedback { display: flex; align-items: center; flex-wrap: wrap; gap: 4px 8px; font-size: .6875rem; color: var(--color-muted); margin-top: 14px; }
.answer-feedback .text-button { font-size: .75rem; }
.answer-loading { display: flex; align-items: center; gap: 8px; color: var(--color-muted); font-size: .8125rem; margin-top: 24px; min-height: 48px; }
.loading-dot { width: 8px; height: 8px; background: var(--color-accent); border-radius: 50%; animation: reading 1.3s ease-in-out infinite; }
@keyframes reading { 50% { opacity: .3; } }
.inline-error { padding: 14px; margin-top: 18px; background: var(--color-error-paper); color: var(--color-error); border-radius: var(--radius); font-size: .875rem; }
.asked-question { margin-top: 30px; }
.asked-question > span { font-size: .6875rem; color: var(--color-muted); }
.asked-question > p { margin-top: 6px; font-size: 1.125rem; font-family: var(--font-display); }
.ask-result .answer-prose { font-size: 1rem; }
.ask-result .answer-sources li { font-size: .875rem; }
.about-view { max-width: 760px; }
.ownership-note { margin-top: 12px; color: var(--color-muted); max-width: 60ch; }
.about-view > .prose { margin-top: 36px; }
.about-view > .text-link { margin-top: 30px; }
.modal { width: min(440px, calc(100% - 32px)); max-height: calc(100dvh - 40px); border: 1px solid var(--color-rule); background: var(--color-surface); color: var(--color-ink); border-radius: 10px; padding: 32px 22px 24px; box-shadow: var(--shadow-dialog); }
.modal-wide { width: min(640px, calc(100% - 32px)); }
dialog:modal { overscroll-behavior: contain; }
dialog::backdrop { background: var(--color-backdrop); overflow: hidden; overscroll-behavior: contain; }
.modal h2 { font-size: 1.875rem; padding-inline-end: 24px; }
.modal-close { display: flex; align-items: center; justify-content: center; position: absolute; inset-inline-end: 6px; top: 6px; width: 48px; height: 48px; border: 0; background: var(--color-transparent); color: var(--color-muted); border-radius: var(--radius); }
.modal-intro { color: var(--color-muted); font-size: .875rem; line-height: 1.7; margin-top: 10px; margin-bottom: 24px; }
.field-hint { font-size: .75rem; color: var(--color-muted); line-height: 1.6; margin-top: 7px; }
.password-wrap { position: relative; }
.password-wrap input { padding-inline-end: 62px; }
.password-toggle { position: absolute; inset-inline-end: 1px; top: 1px; height: 46px; min-width: 55px; border: 0; background: var(--color-transparent); color: var(--color-muted); font-size: .75rem; }
.form-status { color: var(--color-error); min-height: 1.5em; margin-block: 12px; font-size: .8125rem; line-height: 1.6; }
.form-status.is-success { color: var(--color-success); }
.auth-switch { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 0 4px; border-top: 1px solid var(--color-rule); padding-top: 14px; margin-top: 24px; font-size: .8125rem; color: var(--color-muted); }
.auth-switch .text-button { font-size: .8125rem; }
.submission { padding-block: 16px; border-bottom: 1px solid var(--color-rule); }
.submission h3 { margin-block: 8px; font-size: 1rem; }
.submission p { color: var(--color-muted); font-size: .8125rem; overflow-wrap: anywhere; }
.submission time { display: block; font-size: .6875rem; color: var(--color-muted); margin-top: 10px; }
.status-label { display: inline-flex; padding: 3px 8px; background: var(--color-paper-2); color: var(--color-ink-2); border-radius: 3px; font-size: .6875rem; text-transform: capitalize; }
.status-published { background: var(--color-success-paper); color: var(--color-success); }
.status-rejected { background: var(--color-error-paper); color: var(--color-error); }
.account-actions { margin-top: 24px; }
.admin-login { max-width: 560px; padding-top: 20px; border-top: 1px solid var(--color-rule); }
.admin-login .button { margin-top: 20px; }
.admin-toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; border-block: 1px solid var(--color-rule); padding-block: 12px; }
.admin-toolbar > span { margin-inline-end: auto; font-size: .875rem; }
.metrics-panel { padding-block: 24px; border-bottom: 1px solid var(--color-rule); }
.metrics-panel summary { cursor: pointer; min-height: 48px; display: flex; align-items: center; font-weight: 600; }
.metrics-panel dl { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); margin-block: 8px 0; gap: 18px; }
.metrics-panel dt { color: var(--color-muted); font-size: .75rem; text-transform: capitalize; }
.metrics-panel dd { margin: 3px 0 0; font-family: var(--font-display); font-size: 1.5rem; font-variant-numeric: tabular-nums; }
.review-item { padding-block: 24px; border-bottom: 1px solid var(--color-rule); }
.review-item h2 { font-size: 1.5rem; margin-block: 8px; }
.review-item > .muted { font-size: .75rem; }
.review-item > .prose { margin-top: 18px; font-size: .9375rem; }
.review-actions { display: flex; gap: 12px; margin-top: 24px; }
.reports { margin-top: 32px; }
@media (hover: hover) and (pointer: fine) {
  .button-primary:hover:not(:disabled) { background: var(--color-accent-hover); color: var(--color-accent-ink); }
  .button-outline:hover:not(:disabled), .button-quiet:hover:not(:disabled), .nav-link:hover, .category-link:hover { background: var(--color-paper-2); color: var(--color-accent); }
  .thread-row h2 a:hover, .text-link:hover, .reading-link:hover, .library-item h2 a:hover, .footer a:hover { color: var(--color-accent); text-decoration: underline; }
  .starter-button:hover, .text-button:hover, .back-link:hover { color: var(--color-accent); }
  input:hover, textarea:hover, select:hover { background: var(--color-paper); color: var(--color-ink); }
  .modal-close:hover, .search-submit:hover { background: var(--color-paper-2); color: var(--color-ink); }
}
@media (min-width: 25rem) {
  .account-button span { max-width: 100px; }
  .thread-meta { font-size: .75rem; }
}
@media (min-width: 40rem) {
  .page-heading { flex-wrap: nowrap; gap: 24px; margin-bottom: 28px; }
  .thread-row { grid-template-columns: minmax(0, 1fr) 48px; column-gap: 24px; padding-block: 25px; }
  .reply-count-label { display: inline; }
  .listing-label { display: inline; }
  .meta-dot { display: inline; }
  .thread-meta { gap: 8px; }
  .thread-preview { -webkit-line-clamp: 1; }
  .thread-row h2 { font-size: 1.125rem; }
  .modal { padding: 36px 32px 28px; }
  .topic-byline time, .reply-heading time { margin-inline-start: auto; }
  .ask-workspace .ask-form { padding: 24px; }
  .question-starters { align-items: flex-start; }
  .starter-button { width: 100%; }
}
@media (min-width: 58rem) {
  .mobile-categories { display: none; }
  .account-button span { max-width: 160px; }
  .ask-intro { padding-top: 36px; }
  .about-view h1 { max-width: 18ch; }
}
@media (min-width: 76rem) {
  .ask-form label { font-size: .6875rem; }
  .ask-form-bottom > span { font-size: .625rem; }
  .ask-form .button { padding-inline: 11px; }
  .page-heading { align-items: flex-start; }
  .page-heading > .button { margin-top: 4px; }
  .page-heading p { font-size: .875rem; max-width: 38ch; }
}
@media (min-width: 90rem) {
  .page-heading p { max-width: 48ch; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* USA Standard reference direction: navy, cream and red; compound information first. */
body { font-size: 16px; }
h1, h2, h3 { font-family: var(--font-display); }
h1 { font-weight: 500; letter-spacing: -.035em; }
h2 { font-weight: 500; letter-spacing: -.025em; }
.button { border-radius: 3px; font-weight: 600; }
.button-primary { background: var(--color-action); color: var(--color-accent-ink); }
.site-header { background: var(--color-accent); color: var(--color-accent-ink); }
.header-inner { max-width: 1440px; margin-inline: auto; padding: 18px 20px 0; display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 12px; }
.site-wordmark { display: flex; align-items: center; font-size: 1.375rem; font-weight: 600; letter-spacing: -.04em; text-decoration: none; min-height: 48px; white-space: nowrap; }
.site-wordmark span { font-weight: 400; }
.header-account { grid-column: 2; grid-row: 1; }
.header-account .button { color: var(--color-accent-ink); background: var(--color-transparent); border-color: var(--color-transparent); min-height: 48px; padding-inline: 8px; }
.header-account .account-button span { max-width: 76px; }
.site-nav { grid-column: 1 / -1; display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.site-nav a { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 8px 0 13px; text-decoration: none; font-size: .8125rem; white-space: nowrap; border-bottom: 3px solid var(--color-transparent); }
.site-nav a[aria-current="page"] { border-bottom-color: var(--color-accent-ink); font-weight: 600; }
.page-shell { max-width: 1440px; margin: 0 auto; padding: 36px 20px 56px; min-height: calc(100dvh - 300px); }
.page-shell-home { padding-top: 0; }
.page-shell-forum, .page-shell-library, .page-shell-topic, .page-shell-article, .page-shell-about, .page-shell-moderation { max-width: 1080px; }
.page-shell-ask { max-width: 940px; }
.page-heading { margin-bottom: 28px; }
.page-heading p { color: var(--color-muted); max-width: 55ch; }
.home-intro { display: grid; gap: 8px; padding: 40px 0 32px; border-bottom: 1px solid var(--color-rule); }
.home-copy h1 { color: var(--color-accent); font-size: clamp(2.75rem, 5vw, 4rem); font-weight: 500; line-height: 1.08; letter-spacing: -.035em; }
.home-copy > p { font-size: 1.125rem; line-height: 1.65; max-width: 27ch; margin-top: 24px; color: var(--color-ink-2); }
.home-copy > .button { margin-top: 24px; padding-inline: 20px; }
.home-science { display: flex; align-items: center; min-width: 0; }
.chemical-diagram { margin: 4px 0 0; width: 100%; color: var(--color-molecule); }
.chemical-diagram svg { width: 100%; height: auto; display: block; overflow: visible; }
.chem-labels { font-family: var(--font-body); font-size: 29px; font-weight: 500; }
.chem-bond, .chem-pointer { stroke: var(--color-action); }
.chem-annotation { font-family: var(--font-body); fill: var(--color-action); font-size: 19px; font-weight: 600; }
.chemical-diagram figcaption { max-width: 51ch; margin: 0 auto; font-size: .8125rem; line-height: 1.7; color: var(--color-muted); }
.chemical-diagram figcaption strong { font-weight: 600; color: var(--color-accent); }
.compound-section { padding-top: 36px; scroll-margin-top: 24px; }
.section-title { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 24px; }
.section-title h2 { font-size: 1.625rem; color: var(--color-accent); }
.section-title > a { display: inline-flex; align-items: center; gap: 8px; min-height: 48px; font-size: .8125rem; text-decoration: none; white-space: nowrap; }
.section-title .icon { width: 16px; height: 16px; }
.compound-grid { display: grid; grid-template-columns: minmax(0, 1fr); border-top: 1px solid var(--color-rule); }
.compound-card { min-width: 0; border-bottom: 1px solid var(--color-rule); }
.compound-card-link { display: flex; height: 100%; flex-direction: column; padding: 24px 0; text-decoration: none; color: var(--color-ink); }
.compound-card-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; }
.compound-card h3 { color: var(--color-accent); font-size: 1.375rem; line-height: 1.25; font-weight: 600; letter-spacing: -.035em; }
.compound-card-top .icon { margin-top: 5px; width: 18px; height: 18px; }
.compound-area { font-size: .875rem; line-height: 1.65; color: var(--color-ink-2); margin-top: 10px; }
.compound-formula { color: var(--color-accent); font-size: 1.125rem; font-weight: 600; letter-spacing: .01em; line-height: 1.8; padding-top: 24px; margin-top: auto; }
.compound-formula sub, .profile-formula sub { font-size: .65em; vertical-align: sub; line-height: 0; }
.compound-evidence { font-size: .75rem; line-height: 1.6; color: var(--color-muted); margin-top: 6px; }
.compound-search { max-width: 660px; margin-bottom: 32px; }
.home-explanation { display: grid; gap: 32px; padding-top: 44px; }
.home-explanation h2 { color: var(--color-accent); font-size: 1.625rem; margin-bottom: 16px; }
.home-explanation p { color: var(--color-ink-2); max-width: 55ch; line-height: 1.75; font-size: .9375rem; }
.home-explanation .text-link { margin-top: 12px; }
.site-footer { background: var(--color-accent); color: var(--color-accent-ink); display: flex; justify-content: space-between; flex-wrap: wrap; align-items: center; gap: 24px; padding: 32px max(20px, calc((100% - 1360px)/2)); }
.site-footer p { font-size: .75rem; line-height: 1.6; }
.site-footer nav { display: flex; align-items: center; flex-wrap: wrap; gap: 24px; }
.site-footer nav a { min-height: 48px; display: inline-flex; align-items: center; text-decoration: none; font-size: .8125rem; white-space: nowrap; }
.mobile-categories { display: block; max-width: 360px; }
.thread-row { padding-block: 24px; }
.thread-row h2 { font-size: 1.125rem; }
.thread-preview { -webkit-line-clamp: 2; }
.thread-meta { font-size: .75rem; }
.editorial-mark { font-family: var(--font-body); font-size: .625rem; background: var(--color-paper-3); color: var(--color-accent); }
.thread-category a { color: var(--color-muted); }
.community-note { border-top: 1px solid var(--color-rule); padding-top: 20px; }
.article-view h1, .topic-view h1 { max-width: 23ch; font-size: clamp(2rem, 4vw, 3.25rem); }
.article-kind { color: var(--color-muted); }
.article-summary { font-size: 1.125rem; }
.article-view .prose { max-width: 72ch; }
.article-byline { font-size: .75rem; }
.prose h2, .article-sources > h2 { font-size: 1.5rem; font-weight: 600; color: var(--color-accent); }
.library-item h2 { font-size: 1.5rem; font-weight: 600; color: var(--color-accent); }
.library-item h2 a { min-height: auto; }
.library-item { padding-block: 28px; }
.article-view > .text-link { margin-top: 24px; }
.back-link { font-size: .8125rem; margin-bottom: 20px; }
.peptide-heading { display: flex; flex-direction: column; gap: 28px; padding-bottom: 30px; border-bottom: 1px solid var(--color-rule); }
.peptide-heading h1 { color: var(--color-accent); font-size: clamp(2.25rem, 4vw, 4rem); line-height: 1.1; }
.peptide-heading > div:first-child > p { margin-top: 16px; color: var(--color-ink-2); font-size: 1.0625rem; max-width: 54ch; line-height: 1.65; }
.profile-formula { display: flex; flex-direction: column; gap: 8px; align-items: flex-start; }
.profile-formula > span { font-size: .75rem; color: var(--color-muted); }
.profile-formula > strong { color: var(--color-accent); font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 600; letter-spacing: .01em; overflow-wrap: anywhere; }
.profile-main { display: grid; gap: 36px; padding-top: 32px; }
.profile-copy { min-width: 0; }
.profile-copy.prose { font-size: 1rem; line-height: 1.85; }
.profile-copy.prose section + section { margin-top: 32px; }
.profile-copy.prose h2 { font-size: 1.5rem; }
.evidence-summary { font-weight: 600; color: var(--color-accent); font-size: .875rem; }
.approval-note { border-top: 1px solid var(--color-rule); padding-top: 28px; }
.formula-panel { padding: 24px; background: var(--color-paper-2); color: var(--color-ink); align-self: start; border-radius: 3px; }
.formula-panel h2 { font-size: 1.375rem; color: var(--color-accent); margin-bottom: 14px; }
.formula-panel > p { font-size: .875rem; line-height: 1.75; color: var(--color-ink-2); }
.atom-counts { margin: 22px 0 0; }
.atom-counts > div { display: grid; grid-template-columns: 32px minmax(0, 1fr); gap: 10px; align-items: baseline; border-top: 1px solid var(--color-rule); padding-block: 12px; }
.atom-counts dt { font-size: 1.25rem; font-weight: 600; color: var(--color-accent); }
.atom-counts dd { margin: 0; font-size: .8125rem; color: var(--color-ink-2); }
.atom-counts dd strong { font-variant-numeric: tabular-nums; color: var(--color-accent); }
.sequence-details { border-top: 1px solid var(--color-rule); margin-top: 12px; padding-top: 8px; }
.sequence-details summary { display: list-item; min-height: 48px; padding-block: 12px; cursor: pointer; font-size: .8125rem; font-weight: 600; color: var(--color-accent); }
.sequence-details p, .sequence-note { font-size: .75rem; line-height: 1.75; color: var(--color-muted); margin-top: 12px; }
.sequence { word-break: break-word; overflow-wrap: anywhere; color: var(--color-ink-2); }
.profile-sources { margin-top: 36px; padding-top: 28px; border-top: 1px solid var(--color-rule); max-width: 900px; }
.profile-sources h2 { color: var(--color-accent); font-size: 1.5rem; margin-bottom: 12px; }
.review-date { margin-top: 20px; color: var(--color-muted); font-size: .75rem; }
.field-citations { display: flex; align-items: center; gap: 8px; font-size: .75rem; color: var(--color-muted); margin-top: 8px; }
.field-citations a { display: inline-flex; align-items: center; justify-content: center; min-width: 32px; min-height: 40px; color: var(--color-accent); text-decoration: none; }
.formula-panel .formula-note { margin-top: 16px; font-size: .75rem; color: var(--color-muted); }
.source-number { border-radius: 0; background: var(--color-paper-3); color: var(--color-accent); }
.source-list li { font-size: .875rem; line-height: 1.65; }
.source-list a { min-height: auto; }
.ask-workspace { max-width: none; }
.ask-workspace .ask-form { padding: 20px; border: 1px solid var(--color-rule); background: var(--color-paper-2); color: var(--color-ink); border-radius: 3px; }
.ask-workspace .ask-form textarea { min-height: 130px; }
.question-starters { margin-top: 18px; gap: 0; }
.starter-button { padding-block: 14px; }
.asked-question > p { font-size: 1rem; font-weight: 600; }
.answer-heading > strong { color: var(--color-accent); }
.answer-prose { font-size: 1rem; }
.about-view { max-width: 800px; }
.about-view h1 { max-width: none; color: var(--color-accent); }
.modal { border-radius: 4px; }
.modal h2 { font-size: 1.75rem; color: var(--color-accent); font-weight: 600; letter-spacing: -.035em; }
.modal-intro { margin-top: 12px; }
.reply-compose h3 { font-family: var(--font-body); font-size: 1.25rem; font-weight: 600; color: var(--color-accent); }
@media (hover: hover) and (pointer: fine) {
  .button-primary:hover:not(:disabled) { background: var(--color-action-hover); color: var(--color-accent-ink); }
  .header-account .button:hover { background: var(--color-accent-hover); color: var(--color-accent-ink); }
  .site-nav a:hover, .site-footer a:hover { text-decoration: underline; }
  .compound-card-link:hover .compound-card-top h3 { text-decoration: underline; text-underline-offset: .15em; }
  .compound-card-link:hover .compound-card-top .icon { transform: translateX(3px); }
}
@media (min-width: 40rem) {
  .header-inner { padding: 16px 32px 0; }
  .site-wordmark { font-size: 1.625rem; }
  .site-nav { gap: 32px; justify-content: flex-start; }
  .site-nav a { font-size: .875rem; }
  .page-shell { padding: 48px 32px 72px; }
  .page-shell-home { padding-top: 0; }
  .home-intro { padding-block: 48px; }
  .home-copy > p { max-width: 37ch; }
  .chemical-diagram { max-width: 620px; margin: 12px auto 0; }
  .chemical-diagram figcaption { text-align: center; }
  .compound-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 28px; }
  .compound-card-link { padding-block: 28px; }
  .compound-card h3 { font-size: 1.5rem; }
  .section-title h2 { font-size: 2rem; }
  .home-explanation { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px; padding-top: 48px; }
  .home-explanation h2 { font-size: 1.75rem; }
  .site-footer { padding: 36px 32px; }
  .page-heading p { font-size: 1rem; }
  .peptide-heading { flex-direction: row; justify-content: space-between; gap: 32px; }
  .profile-formula { min-width: 230px; padding-top: 8px; }
  .profile-formula > strong { font-size: 1.5rem; }
  .profile-main { padding-top: 40px; }
  .question-starters { flex-direction: row; flex-wrap: wrap; gap: 10px 24px; }
  .starter-button { width: auto; gap: 16px; }
}
@media (min-width: 62rem) {
  .header-inner { display: flex; justify-content: space-between; gap: 32px; padding: 24px 40px; min-height: 104px; }
  .site-wordmark { font-size: 1.75rem; }
  .site-nav { gap: 32px; margin-inline-start: auto; }
  .site-nav a { padding-block: 12px 10px; }
  .header-account { margin-inline-start: 24px; }
  .header-account .account-button span { max-width: 140px; }
  .page-shell { padding-inline: 40px; }
  .home-intro { grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 40px; align-items: center; padding-block: 64px; }
  .home-copy > p { font-size: 1.25rem; max-width: 31ch; }
  .home-copy > .button { margin-top: 32px; }
  .chemical-diagram { margin-top: 0; }
  .chemical-diagram figcaption { text-align: start; max-width: 47ch; padding-inline: 20px; }
  .compound-section { padding-top: 48px; }
  .compound-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); column-gap: 36px; }
  .compound-card-link { padding-block: 32px; }
  .compound-card h3 { font-size: 1.625rem; }
  .compound-area { font-size: .9375rem; }
  .compound-formula { font-size: 1.25rem; padding-top: 28px; }
  .home-explanation { gap: 100px; padding-top: 60px; }
  .home-explanation h2 { font-size: 2rem; }
  .home-explanation p { font-size: 1rem; }
  .profile-main { grid-template-columns: minmax(0, 1fr) 340px; gap: 64px; }
  .profile-formula { min-width: 300px; }
  .profile-formula > strong { font-size: 1.875rem; }
  .profile-copy.prose section + section { margin-top: 36px; }
  .profile-copy.prose h2 { font-size: 1.75rem; }
  .formula-panel { padding: 28px; }
  .site-footer { padding: 40px max(40px, calc((100% - 1360px)/2)); }
}

.regulatory-details { border-top: 1px solid var(--color-rule); margin-top: var(--space-8); padding-top: var(--space-3); }
.regulatory-details summary { color: var(--color-accent); cursor: pointer; font-size: 1.125rem; font-weight: 500; min-height: 48px; align-content: center; }
.regulatory-details[open] summary { margin-bottom: var(--space-3); }

/* Compact site-wide conversation; the native dialog keeps keyboard focus contained. */
.genie-launcher { position: fixed; z-index: 20; right: max(20px, env(safe-area-inset-right)); bottom: max(20px, env(safe-area-inset-bottom)); display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 52px; padding: 12px 20px; border: 1px solid var(--color-accent-ink); border-radius: 28px; background: var(--color-accent); color: var(--color-accent-ink); box-shadow: 0 5px 20px #13266b20; font-size: .9375rem; font-weight: 500; cursor: pointer; }
.genie-launcher:hover { background: var(--color-accent-hover); }
.genie-dialog { position: fixed; inset: auto 20px 20px auto; margin: 0; padding: 0; width: min(440px, calc(100vw - 40px)); height: min(650px, calc(100dvh - 40px)); max-height: calc(100dvh - 40px); max-width: none; border: 1px solid var(--color-rule); border-radius: 8px; background: var(--color-paper); color: var(--color-ink); box-shadow: var(--shadow-dialog); overflow: hidden; }
.genie-dialog[open] { display: flex; flex-direction: column; }
.genie-dialog::backdrop { background: #13266b20; }
.genie-dialog-header { flex: 0 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 12px; background: var(--color-accent); color: var(--color-accent-ink); padding: 18px 12px 20px 22px; }
.genie-dialog-header h2 { font-size: 1.375rem; font-weight: 500; letter-spacing: -.025em; }
.genie-dialog-header p { font-size: .75rem; line-height: 1.6; margin-top: 7px; }
.genie-close { flex-shrink: 0; width: 48px; height: 48px; display: grid; place-items: center; border: 0; background: none; color: inherit; cursor: pointer; border-radius: 3px; }
.genie-close:hover { background: #ffffff12; }
.genie-close:focus-visible { outline-color: var(--color-accent-ink); }
.chat-content { display: flex; flex-direction: column; min-height: 0; }
.genie-dialog .chat-content { flex: 1; }
.chat-messages { min-height: 0; overflow-y: auto; overscroll-behavior: contain; padding: 24px; flex: 1; }
.chat-welcome > p { font-size: 1.25rem; color: var(--color-accent); font-weight: 500; line-height: 1.5; }
.chat-welcome .question-starters { display: flex; flex-direction: column; align-items: flex-start; margin-top: 16px; }
.chat-welcome .starter-button { min-height: 48px; padding-block: 12px; text-align: left; font-size: .8125rem; }
.chat-content .ask-form { flex: 0 0 auto; padding: 16px; border: 0; border-top: 1px solid var(--color-rule); border-radius: 0; background: var(--color-surface); }
.chat-content .ask-form textarea { min-height: 82px; max-height: 160px; font-size: 1rem; resize: vertical; }
.chat-content .ask-form-bottom { margin-top: 8px; gap: 8px; }
.chat-content .ask-form-bottom > span { max-width: 175px; font-size: .625rem; line-height: 1.5; }
.chat-content .ask-form .button { min-height: 48px; padding-inline: 16px; }
.chat-turn + .chat-turn { margin-top: 30px; padding-top: 24px; border-top: 1px solid var(--color-rule); }
.chat-turn .asked-question { margin: 0 0 18px; padding: 12px 14px; background: var(--color-paper-2); border-radius: 3px; }
.chat-turn .asked-question > p { font-size: .9375rem; line-height: 1.65; overflow-wrap: anywhere; font-weight: 500; }
.chat-turn .chat-answer { margin: 0; padding: 0; border: 0; }
.chat-turn .answer-heading { margin-bottom: 8px; }
.chat-turn .answer-prose { font-size: .9375rem; line-height: 1.75; overflow-wrap: anywhere; }
.chat-turn .answer-notice { margin-top: 14px; font-size: .6875rem; color: var(--color-muted); line-height: 1.6; }
.chat-turn .answer-sources { margin-top: 16px; }
.chat-turn .answer-sources li { font-size: .75rem; }
.ask-workspace.chat-content { min-height: 450px; max-height: min(760px, calc(100dvh - 220px)); border: 1px solid var(--color-rule); border-radius: 4px; overflow: hidden; }
.ask-workspace .chat-messages { min-height: 220px; }
.site-footer { padding-bottom: 90px; }
@media (max-width: 480px) {
  .genie-launcher { right: max(14px, env(safe-area-inset-right)); bottom: max(14px, env(safe-area-inset-bottom)); min-height: 50px; padding: 11px 17px; }
  .genie-dialog { inset: auto 8px max(8px, env(safe-area-inset-bottom)) 8px; width: calc(100vw - 16px); height: min(620px, calc(100dvh - 16px)); max-height: calc(100dvh - 16px); }
  .genie-dialog-header { padding: 14px 8px 16px 18px; }
  .chat-messages { padding: 20px 18px; }
  .chat-content .ask-form { padding: 12px; }
  .chat-content .ask-form-bottom > span { max-width: 140px; }
  .chat-content .ask-form textarea { min-height: 76px; }
  .ask-workspace.chat-content { max-height: 650px; }
}