:root { color-scheme: light; --ink: #172033; --muted: #4c5a70; --surface: #ffffff; --wash: #f2f5fa; --line: #c7d0df; --accent: #0645ad; --accent-dark: #04337e; --focus: #ffbf00; }
* { box-sizing: border-box; }
html { font-family: system-ui, -apple-system, "Segoe UI", sans-serif; line-height: 1.55; color: var(--ink); background: var(--wash); }
body { margin: 0; }
a { color: var(--accent); text-decoration-thickness: .12em; text-underline-offset: .16em; }
a:hover { color: var(--accent-dark); }
.container { width: min(100% - 2rem, 72rem); margin-inline: auto; }
.site-header { padding: 3rem 0 2.5rem; color: #fff; background: #132d55; }
.eyebrow { margin: 0 0 .25rem; font-size: .875rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
h1, h2, h3 { line-height: 1.2; }
h1 { margin: 0; font-size: clamp(2rem, 4vw, 3.25rem); }
h2 { margin: 0; font-size: clamp(1.5rem, 3vw, 2.1rem); }
h3 { margin: 0; font-size: 1.25rem; }
.lead { max-width: 52rem; margin: 1rem 0 0; font-size: 1.125rem; }
.site-nav { background: var(--surface); border-bottom: 1px solid var(--line); }
.nav-inner { display: flex; flex-wrap: wrap; gap: 1.25rem; padding-block: .85rem; }
main { padding-block: 2rem 4rem; }
.preview-notice { margin-bottom: 2rem; padding: 1rem 1.25rem; border-left: .35rem solid #956d00; background: #fff6d8; }
.page-heading { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.button { cursor: pointer; padding: .65rem 1rem; border: 2px solid var(--accent); border-radius: .35rem; font: inherit; font-weight: 700; }
.button.secondary { color: var(--accent); background: var(--surface); }
.button:hover { background: #eaf1ff; }
.topic-list { display: grid; gap: 1rem; }
.topic-card { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem 2rem; padding: 1.25rem; background: var(--surface); border: 1px solid var(--line); border-radius: .5rem; }
.topic-main { min-width: min(100%, 30rem); flex: 1 1 60%; }
.topic-meta { display: flex; flex-wrap: wrap; gap: .35rem 1.25rem; margin: .7rem 0 0; color: var(--muted); font-size: .95rem; }
.topic-activity { display: flex; flex: 0 1 12rem; flex-direction: column; align-items: flex-start; color: var(--muted); }
.activity-label { font-size: .875rem; font-weight: 700; }
.subscription { margin-top: .45rem; padding: .15rem .5rem; border-radius: 1rem; color: #27420e; background: #e7f3d8; font-size: .875rem; }
.pagination { margin-top: 2rem; padding: 1rem; background: var(--surface); border: 1px solid var(--line); }
.pagination-summary { margin: 0 0 .5rem; font-weight: 700; }
.pagination ul { display: flex; flex-wrap: wrap; gap: .5rem; padding: 0; margin: 0; list-style: none; }
.pagination a { display: inline-block; padding: .45rem .7rem; border: 1px solid var(--line); border-radius: .3rem; }
.pagination a[aria-current="page"] { color: #fff; background: var(--accent); border-color: var(--accent); }
.simple-section { margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }
.site-footer { padding: 1.5rem 0; color: #fff; background: #132d55; }
.skip-link { position: absolute; z-index: 2; top: .5rem; left: .5rem; padding: .65rem 1rem; color: #fff; background: #000; transform: translateY(-180%); }
.skip-link:focus { transform: translateY(0); }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
:focus-visible { outline: .25rem solid var(--focus); outline-offset: .2rem; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; } }
.breadcrumb { margin-bottom: 1.5rem; color: var(--muted); }
.message-list { display: grid; gap: 1rem; padding: 0; list-style: none; }
.message-card { padding: 1.25rem; background: var(--surface); border: 1px solid var(--line); border-radius: .5rem; }
.message-card header { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: .5rem 1rem; border-bottom: 1px solid var(--line); }
.message-card h4 { margin: 0; font-size: 1.1rem; }
.message-card header p { margin: 0; color: var(--muted); }
.message-body { min-height: 5rem; padding-block: .75rem; }
.message-card footer { font-size: .9rem; }
.topic-actions, .form-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.5rem; }
.button { display: inline-block; color: #fff; background: var(--accent); text-decoration: none; }
.button.secondary { color: var(--accent); background: var(--surface); }
.reply-form { max-width: 48rem; padding: 1.25rem; background: var(--surface); border: 1px solid var(--line); border-radius: .5rem; }
.form-field { display: grid; gap: .5rem; }
.form-field label { font-weight: 700; }
.form-field textarea { width: 100%; min-height: 12rem; padding: .75rem; color: var(--ink); background: #fff; border: 2px solid var(--line); border-radius: .35rem; font: inherit; }
.form-field textarea:focus { border-color: var(--accent); }
.form-field p { margin: 0; color: var(--muted); }
button.button { border: 2px solid var(--accent); font: inherit; }

.empty-state, .error-state { padding: 1.25rem; background: var(--surface); border: 1px solid var(--line); border-left: .35rem solid var(--accent); border-radius: .5rem; }
.error-state { border-left-color: #a32020; }
.error-state h3, .empty-state h3 { margin-top: 0; }

.data-status { margin-bottom: 1.5rem; padding: .85rem 1rem; color: #27420e; background: #e7f3d8; border-left: .35rem solid #4f7d21; }

.notification { margin: 1rem 0; padding: .9rem 1rem; border-left: .35rem solid var(--accent); background: var(--surface); }
.notification-success { border-left-color: #4f7d21; background: #e7f3d8; }
.notification-error { border-left-color: #a32020; background: #fff0f0; }

.category-panel { margin: .75rem 0; background: var(--surface); border: 1px solid var(--line); border-radius: .6rem; }
.category-panel > summary { padding: 1rem 1.2rem; cursor: pointer; overflow-wrap: anywhere; }
.category-panel > summary h3 { display: inline; font-size: 1.15rem; }
.category-panel > summary span { color: var(--muted); }
.category-content { padding: 0 1.2rem 1rem; overflow-wrap: anywhere; }
.category-topics { padding-left: 1.5rem; }
.category-topics li { padding: .6rem 0; }
.category-topics span { color: var(--muted); }

/* Presentation and spacing between forum sections. */
main > section + section { margin-top: 2.5rem; }
.forum-welcome section { scroll-margin-top: 1rem; }
.forum-welcome p, .welcome-steps { max-width: 70ch; }
.welcome-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr)); gap: 1rem; margin-top: 1.5rem; }
.welcome-card { padding: 1.25rem; border: 1px solid var(--line); border-radius: .6rem; background: var(--surface); }
.welcome-card p { margin-bottom: 0; }
.welcome-steps { padding-left: 1.5rem; }
.welcome-steps li { padding: .5rem 0 .5rem .25rem; }
.welcome-join { padding: 1.5rem; border-left: .35rem solid var(--accent); background: var(--surface); border-radius: .5rem; }
.site-header .button { background: #fff; color: var(--accent); border-color: #fff; }
.site-header .button:hover { background: #eaf1ff; color: var(--accent-dark); }