:root {
  --color-primary:      #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light:#eff6ff;
  --color-success:      #10b981;
  --color-bg:           #f8fafc;
  --color-surface:      #ffffff;
  --color-border:       #e2e8f0;
  --color-text:         #0f172a;
  --color-muted:        #64748b;
  --color-result-bg:    #f0fdf4;
  --color-result-border:#bbf7d0;
  --radius:             0.5rem;
  --radius-lg:          0.75rem;
  --shadow:             0 1px 3px rgba(0,0,0,.08);
  --shadow-md:          0 4px 6px rgba(0,0,0,.07);
  --font:               system-ui, -apple-system, "Segoe UI", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: var(--font); background: var(--color-bg); color: var(--color-text); line-height: 1.65; }

/* ── Layout ─────────────────────────────────────────── */
.site-header { background: var(--color-surface); border-bottom: 1px solid var(--color-border); position: sticky; top: 0; z-index: 100; }
.site-header__inner { max-width: 1200px; margin: 0 auto; padding: .875rem 1.5rem; display: flex; align-items: center; gap: 2rem; }
.site-logo { font-size: 1.25rem; font-weight: 800; color: var(--color-primary); text-decoration: none; letter-spacing: -.03em; }
.site-logo span { color: var(--color-text); }
.site-search { flex: 1; max-width: 480px; margin: 0 1.5rem; }
.site-search__input { width: 100%; padding: .55rem .9rem; border: 1px solid var(--color-border); border-radius: .5rem; font-size: .9rem; background: var(--color-bg); color: var(--color-text); }
.site-search__input:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(37,99,235,.12); }
.site-header__link { font-size: .9rem; font-weight: 600; color: var(--color-muted); text-decoration: none; padding: .55rem .9rem; border-radius: .4rem; transition: color .15s, background .15s; }
.site-header__link:hover { color: var(--color-primary); background: var(--color-primary-light); }
.site-categories { border-top: 1px solid var(--color-border); background: var(--color-surface); }
.site-categories__list { max-width: 1200px; margin: 0 auto; padding: .65rem 1.5rem; display: flex; flex-wrap: wrap; gap: .35rem 1.5rem; list-style: none; align-items: center; justify-content: center; }
.site-categories__link { font-size: .8rem; font-weight: 500; color: var(--color-muted); text-decoration: none; text-transform: capitalize; white-space: nowrap; transition: color .15s; }
.site-categories__link:hover { color: var(--color-primary); }
.category-overview { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: .75rem; margin-bottom: 2.5rem; }
.category-overview__card { display: flex; align-items: center; gap: 1rem; padding: 1rem 1.25rem; background: #fff; border: 1px solid var(--color-border); border-radius: .75rem; text-decoration: none; color: var(--color-text); transition: border-color .15s, transform .15s, box-shadow .15s; }
.category-overview__card:hover { border-color: var(--color-primary); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(37,99,235,.08); }
.category-overview__icon { font-size: 1.75rem; line-height: 1; flex-shrink: 0; }
.category-overview__name { font-size: .95rem; font-weight: 700; margin-bottom: .15rem; }
.category-overview__count { font-size: .8rem; color: var(--color-muted); }
.category-overview__card--discover { background: linear-gradient(135deg, #f8fafc, #eff6ff); border-color: var(--color-primary); }
.category-overview__card--discover .category-overview__count { color: var(--color-text); font-style: italic; }

.popular-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem; margin-bottom: 2.5rem; }
.popular-card { display: flex; flex-direction: column; background: #fff; border: 1px solid var(--color-border); border-radius: .75rem; padding: 1.25rem 1.5rem; text-decoration: none; color: var(--color-text); transition: border-color .15s, transform .15s, box-shadow .15s; }
.popular-card:hover { border-color: var(--color-primary); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(37,99,235,.08); }
.popular-card__title { font-size: 1.0625rem; font-weight: 700; margin-bottom: .5rem; line-height: 1.3; }
.popular-card__desc { font-size: .85rem; color: var(--color-muted); line-height: 1.5; margin: 0 0 .75rem; flex: 1; }
.popular-card__cat { font-size: .7rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--color-primary); }

.site-footer { background: var(--color-text); color: #94a3b8; padding: 3rem 1.5rem 1.5rem; font-size: .875rem; margin-top: 4rem; }
.site-footer__inner { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 1fr 2fr 1fr; gap: 3rem; }
.site-footer__inner--secondary { margin-top: 2.5rem; padding-top: 2.5rem; border-top: 1px solid #1f2937; }
.site-footer__brand { display: flex; flex-direction: column; gap: .5rem; }
.site-footer__logo { font-size: 1.5rem; font-weight: 800; letter-spacing: -.03em; color: #fff; text-decoration: none; }
.site-footer__logo span { color: var(--color-primary); }
.site-footer__tagline { font-size: 1.125rem; font-weight: 700; color: #fff; margin: .5rem 0 0; }
.site-footer__sub { font-size: .85rem; color: #94a3b8; margin: 0; }
.site-footer__col h3 { color: #fff; font-size: .95rem; font-weight: 700; margin: 0 0 1rem; letter-spacing: -.01em; }
.site-footer__col ul { list-style: none; padding: 0; margin: 0; }
.site-footer__col li { margin-bottom: .5rem; }
.site-footer__col a { color: #cbd5e1; text-decoration: none; font-size: .875rem; transition: color .15s; }
.site-footer__col a:hover { color: #fff; }
.site-footer__cats { display: grid; grid-template-columns: repeat(3, 1fr); gap: .35rem 1.5rem; }
.site-footer__cats li { margin-bottom: 0; text-transform: capitalize; }
.site-footer__bottom { max-width: 1200px; margin: 2.5rem auto 0; padding-top: 1.5rem; border-top: 1px solid #1f2937; text-align: center; color: #64748b; font-size: .8rem; display: flex; flex-direction: column; gap: .5rem; align-items: center; }
.site-footer__legal { display: flex; gap: .5rem; flex-wrap: wrap; justify-content: center; }
.site-footer__legal a { color: #94a3b8; text-decoration: none; }
.site-footer__legal a:hover { color: #fff; }
.site-footer__sep { color: #475569; }
@media (max-width: 768px) {
  .site-footer__inner { grid-template-columns: 1fr; gap: 2rem; }
  .site-footer__cats { grid-template-columns: repeat(2, 1fr); }
}
.container { max-width: 860px; margin: 0 auto; padding: 0 1.5rem; }
.container--wide { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

/* ── Breadcrumb ──────────────────────────────────────── */
.breadcrumb { font-size: .8125rem; color: var(--color-muted); padding: 1rem 0; display: flex; gap: .4rem; align-items: center; }
.breadcrumb a { color: var(--color-muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--color-primary); }

/* ── Page header ─────────────────────────────────────── */
.page-header { padding: 1.5rem 0 1rem; }
.page-header__category { display: inline-block; font-size: .75rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--color-primary); background: var(--color-primary-light); border-radius: 999px; padding: .25rem .75rem; margin-bottom: .75rem; }
.page-header h1 { font-size: 2.25rem; font-weight: 800; line-height: 1.2; letter-spacing: -.03em; margin-bottom: .75rem; }
.page-header__intro { font-size: 1.0625rem; color: var(--color-muted); max-width: 640px; line-height: 1.7; }
.page-header__updated { font-size: .8125rem; color: var(--color-muted); margin-top: .75rem; font-style: italic; }
.page-header__updated time { color: var(--color-text); font-weight: 600; font-style: normal; }
.page-header__byline { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--color-border); display: flex; flex-wrap: wrap; gap: 1.5rem; font-size: .85rem; }
.page-header__byline strong { display: block; font-size: .7rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--color-muted); margin-bottom: .25rem; }
.page-header__byline span { color: var(--color-text); }

.helpful { display: flex; align-items: center; gap: 1rem; margin-top: 1.5rem; padding: 1rem 1.25rem; background: var(--color-primary-light); border-radius: .5rem; flex-wrap: wrap; }
.helpful__count { font-size: .9rem; color: var(--color-text); }
.helpful__count strong { color: var(--color-primary); font-weight: 700; }
.helpful__btn { padding: .55rem 1.1rem; background: var(--color-primary); color: #fff; border: none; border-radius: .4rem; font-weight: 600; font-size: .875rem; cursor: pointer; transition: background .15s, transform .1s; }
.helpful__btn:hover:not(:disabled) { background: #1d4ed8; transform: translateY(-1px); }
.helpful__btn:active:not(:disabled) { transform: translateY(0); }
.helpful--voted { background: #10b981 !important; cursor: default; }

.toc { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: .5rem; padding: 1.25rem 1.5rem; margin: 1.5rem 0 2rem; }
.toc__title { font-size: .75rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--color-muted); margin-bottom: .75rem; }
.toc__list { list-style: decimal inside; padding: 0; margin: 0; columns: 2; column-gap: 2rem; }
.toc__list li { padding: .2rem 0; break-inside: avoid; }
.toc__list a { color: var(--color-primary); text-decoration: none; font-size: .9rem; }
.toc__list a:hover { text-decoration: underline; }
@media (max-width: 640px) {
  .toc__list { columns: 1; }
}

.helpful__btn--ghost { background: #fff !important; color: var(--color-primary) !important; border: 1px solid var(--color-primary) !important; }
.helpful__btn--ghost:hover:not(:disabled) { background: var(--color-primary-light) !important; }

.share-modal { position: fixed; inset: 0; background: rgba(15,23,42,.7); display: none; align-items: center; justify-content: center; z-index: 1000; padding: 1rem; }
.share-modal--open { display: flex; }
.share-modal__dialog { background: #fff; border-radius: .75rem; padding: 2rem; max-width: 480px; width: 100%; position: relative; max-height: 90vh; overflow-y: auto; }
.share-modal__close { position: absolute; top: .75rem; right: 1rem; background: none; border: none; font-size: 1.75rem; line-height: 1; color: var(--color-muted); cursor: pointer; }
.share-modal__close:hover { color: var(--color-text); }
.share-modal__head h3 { font-size: 1.25rem; font-weight: 800; margin: 0 0 .25rem; }
.share-modal__subtitle { font-size: .9rem; color: var(--color-muted); margin: 0 0 1rem; }
.share-modal__lead { font-size: .85rem; color: var(--color-muted); margin: .5rem 0 1rem; line-height: 1.55; }
.share-modal__check { display: flex; align-items: center; gap: .5rem; font-size: .875rem; color: var(--color-text); margin-bottom: .75rem; cursor: pointer; }
.share-modal__url-row { display: flex; gap: .5rem; margin-bottom: 1.25rem; }
.share-modal__url { flex: 1; padding: .55rem .75rem; border: 1px solid var(--color-border); border-radius: .4rem; font-size: .85rem; background: var(--color-surface); }
.share-modal__copy { padding: .55rem 1rem; background: var(--color-primary); color: #fff; border: none; border-radius: .4rem; font-weight: 600; font-size: .85rem; cursor: pointer; }
.share-modal__networks { display: flex; gap: .5rem; flex-wrap: wrap; }
.share-net { flex: 1; min-width: 110px; padding: .65rem; color: #fff; border: none; border-radius: .4rem; font-weight: 600; font-size: .85rem; cursor: pointer; }
.share-net--fb { background: #1877f2; }
.share-net--tw { background: #000; }
.share-net--li { background: #0a66c2; }

.embed-form { display: flex; flex-direction: column; gap: .75rem; }
.embed-form label { display: flex; flex-direction: column; font-size: .8rem; font-weight: 600; color: var(--color-text); gap: .3rem; }
.embed-form input { padding: .55rem .75rem; border: 1px solid var(--color-border); border-radius: .4rem; font-size: .9rem; }
.embed-form input:focus { outline: none; border-color: var(--color-primary); }
.embed-form__legal { font-size: .75rem; color: var(--color-muted); line-height: 1.5; margin: .25rem 0 .25rem; }
.embed-form__legal a { color: var(--color-primary); }
.embed-success { text-align: center; padding: 1rem 0; }
.embed-success p { font-size: 1.0625rem; margin-bottom: 1rem; color: #10b981; font-weight: 600; }

.cite-tabs { display: flex; gap: .25rem; margin-bottom: 1rem; border-bottom: 1px solid var(--color-border); }
.cite-tab { padding: .6rem 1rem; background: none; border: none; font-size: .85rem; color: var(--color-muted); cursor: pointer; font-weight: 600; border-bottom: 2px solid transparent; margin-bottom: -1px; }
.cite-tab--active { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.cite-output { width: 100%; padding: .75rem; border: 1px solid var(--color-border); border-radius: .4rem; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .82rem; line-height: 1.5; resize: vertical; background: var(--color-surface); }
.cite-thanks { font-size: .8rem; color: var(--color-muted); line-height: 1.55; margin: 1rem 0 0; font-style: italic; }

/* ── Calculator widget ───────────────────────────────── */
.calc-widget { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); box-shadow: var(--shadow-md); overflow: hidden; margin: 2rem 0; }
.calc-widget__header { background: var(--color-primary); color: #fff; padding: 1rem 1.5rem; font-size: .9375rem; font-weight: 600; }
.calc-widget__body { display: grid; grid-template-columns: 1fr 1fr; }
.calc-inputs { padding: 1.5rem; border-right: 1px solid var(--color-border); }
.calc-results { padding: 1.5rem; background: #fafbfc; }
.calc-group { margin-bottom: 1.125rem; }
.calc-group label { display: block; font-size: .8125rem; font-weight: 600; color: var(--color-muted); margin-bottom: .35rem; text-transform: uppercase; letter-spacing: .05em; }
.calc-input-row { display: flex; gap: .375rem; }
.calc-input-row input { flex: 1; padding: .5rem .75rem; border: 1.5px solid var(--color-border); border-radius: var(--radius); font-size: 1rem; font-family: var(--font); background: #fff; }
.calc-input-row input:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(37,99,235,.12); }
.calc-input-row select { padding: .5rem .5rem; border: 1.5px solid var(--color-border); border-radius: var(--radius); font-size: .875rem; background: #f8fafc; cursor: pointer; }
.calc-hint { font-size: .75rem; color: var(--color-muted); margin-top: .3rem; }
.calc-divider { border: none; border-top: 1px dashed var(--color-border); margin: 1.25rem 0; }
.calc-section-label { font-size: .6875rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--color-muted); margin-bottom: .75rem; }
.calc-result-card { background: var(--color-result-bg); border: 1.5px solid var(--color-result-border); border-radius: var(--radius); padding: 1rem 1.125rem; margin-bottom: .875rem; }
.calc-result-card--secondary { background: #fff; border-color: var(--color-border); }
.calc-result-label { font-size: .75rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--color-muted); display: block; margin-bottom: .3rem; }
.calc-result-value { font-size: 1.75rem; font-weight: 800; color: var(--color-text); line-height: 1; display: flex; align-items: baseline; gap: .35rem; }
.calc-result-unit { font-size: .9rem; font-weight: 500; color: var(--color-muted); }
.calc-result-alt { font-size: .8125rem; color: var(--color-muted); margin-top: .35rem; }
.calc-empty { font-size: .875rem; color: var(--color-muted); font-style: italic; }

/* ── Punnett square ──────────────────────────────────── */
.punnett-table { border-collapse: collapse; font-size: .8rem; width: 100%; }
.punnett-table th, .punnett-table td { border: 1px solid var(--color-border); padding: .35rem .5rem; text-align: center; min-width: 48px; }
.punnett-table th { background: #f1f5f9; font-weight: 700; color: var(--color-muted); }
.punnett-dominant { background: #dbeafe; font-weight: 600; }
.punnett-recessive { background: #fef3c7; }

/* ── Gestation / milestone timeline ─────────────────── */
.calc-milestone { display: flex; align-items: flex-start; gap: .5rem; margin-bottom: .5rem; font-size: .8125rem; }
.calc-milestone__icon { width: 1.25rem; text-align: center; flex-shrink: 0; color: var(--color-primary); font-weight: 700; }
.calc-milestone--done .calc-milestone__icon { color: #22c55e; }
.calc-milestone__label { flex: 1; font-weight: 600; }
.calc-milestone__date { color: var(--color-muted); white-space: nowrap; }

/* ── Ratio rows ──────────────────────────────────────── */
.ratio-row { display: flex; justify-content: space-between; padding: .25rem 0; border-bottom: 1px solid var(--color-border); font-size: .8125rem; }
.ratio-row:last-child { border-bottom: none; }

/* ── Content ─────────────────────────────────────────── */
.content { margin-top: 3rem; }
.content h2 { font-size: 1.5rem; font-weight: 700; letter-spacing: -.02em; margin: 2.5rem 0 .875rem; padding-top: 1rem; border-top: 1px solid var(--color-border); }
.content h3 { font-size: 1.125rem; font-weight: 700; margin: 1.5rem 0 .5rem; }
.content p { margin-bottom: 1rem; }
.content ul, .content ol { padding-left: 1.5rem; margin-bottom: 1rem; }
.content li { margin-bottom: .4rem; }
.content code { background: #f1f5f9; padding: .15em .4em; border-radius: .25rem; font-size: .9em; font-family: monospace; }

.formula-block { background: #1e293b; color: #e2e8f0; border-radius: var(--radius-lg); padding: 1.25rem 1.5rem; font-family: monospace; font-size: .9375rem; line-height: 1.8; margin: 1.25rem 0; overflow-x: auto; }
.formula-block .var { color: #93c5fd; }
.formula-block .op  { color: #f472b6; }
.formula-block .val { color: #86efac; }

.data-table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: .9rem; }
.data-table th { background: var(--color-primary); color: #fff; padding: .625rem .875rem; text-align: left; font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; }
.data-table td { padding: .5rem .875rem; border-bottom: 1px solid var(--color-border); }
.data-table tr:nth-child(even) td { background: #f8fafc; }
.data-table tr:hover td { background: var(--color-primary-light); }

.faq { margin-top: 1rem; }
.faq-item { border: 1px solid var(--color-border); border-radius: var(--radius); margin-bottom: .625rem; overflow: hidden; }
.faq-item summary { padding: .875rem 1.125rem; cursor: pointer; font-weight: 600; font-size: .9375rem; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 1.25rem; color: var(--color-primary); }
.faq-item[open] summary::after { content: "−"; }
.faq-item[open] summary { border-bottom: 1px solid var(--color-border); }
.faq-item .faq-answer { padding: .875rem 1.125rem; color: var(--color-muted); }

.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: .75rem; margin-top: 1rem; }
.related-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: .875rem 1rem; text-decoration: none; color: var(--color-text); transition: border-color .15s, box-shadow .15s; display: block; }
.related-card:hover { border-color: var(--color-primary); box-shadow: var(--shadow-md); }
.related-card__cat { font-size: .7rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--color-primary); margin-bottom: .25rem; }
.related-card__title { font-size: .875rem; font-weight: 600; }

/* ── Homepage ─────────────────────────────────────────── */
.home-header { padding: 3rem 0 2rem; text-align: center; }
.home-header h1 { font-size: 3rem; font-weight: 900; letter-spacing: -.04em; margin-bottom: .75rem; }
.home-header h1 em { color: var(--color-primary); font-style: normal; }
.home-header p { color: var(--color-muted); font-size: 1.125rem; }
.category-section { margin-bottom: 2.5rem; }
.category-section h2 { font-size: 1.125rem; font-weight: 700; text-transform: capitalize; margin-bottom: 1rem; display: flex; align-items: center; gap: .5rem; }
.category-section h2::after { content: ""; flex: 1; height: 1px; background: var(--color-border); }
.calc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: .625rem; }
.calc-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: .75rem 1rem; text-decoration: none; color: var(--color-text); font-size: .875rem; font-weight: 500; transition: border-color .15s; display: flex; align-items: center; gap: .5rem; }
.calc-card::before { content: "→"; color: var(--color-primary); }
.calc-card:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* ── Tool page two-column layout ────────────────────── */
.tool-layout { display: grid; grid-template-columns: 1fr 380px; gap: 3rem; align-items: start; padding-bottom: 4rem; }
.tool-content { min-width: 0; }
.tool-sidebar { position: sticky; top: 80px; }
.tool-sidebar .calc-widget { max-width: 100%; }
@media (max-width: 900px) {
  .tool-layout { grid-template-columns: 1fr; }
  .tool-sidebar { position: static; order: -1; }
}

/* ── Omni-style single-column variable rows ─────────── */
.omni-var { margin-bottom: 1rem; }
.omni-var__label { font-size: .8125rem; font-weight: 600; color: var(--color-muted); margin-bottom: .35rem; text-transform: uppercase; letter-spacing: .05em; }
.omni-var__row { display: flex; align-items: stretch; gap: .375rem; }
.omni-var__input { flex: 1; padding: .6rem .875rem; border: 1.5px solid var(--color-border); border-radius: var(--radius); font-size: 1rem; font-family: var(--font); background: #fff; }
.omni-var__input:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(37,99,235,.12); }
.omni-var__unit { padding: .6rem .625rem; border: 1.5px solid var(--color-border); border-radius: var(--radius); font-size: .875rem; background: #f8fafc; cursor: pointer; min-width: 72px; }
.omni-var__unit--static { padding: .6rem .625rem; border: 1.5px solid var(--color-border); border-radius: var(--radius); font-size: .875rem; background: #f1f5f9; color: var(--color-muted); min-width: 72px; display: flex; align-items: center; justify-content: center; font-weight: 500; }
.omni-var__unit--output { padding: .6rem .625rem; border: 1.5px solid #bfdbfe; border-radius: var(--radius); background: var(--color-primary-light); font-size: .875rem; font-weight: 600; color: var(--color-muted); min-width: 72px; display: flex; align-items: center; justify-content: center; }
.omni-var--output .omni-var__label { color: var(--color-primary); }
.omni-var__result { flex: 1; padding: .6rem .875rem; background: var(--color-primary-light); border: 1.5px solid #bfdbfe; border-radius: var(--radius); font-size: 1.125rem; font-weight: 700; color: var(--color-text); }
.omni-separator { border: none; border-top: 2px dashed var(--color-border); margin: 1.25rem 0; }

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 640px) {
  .calc-widget__body { grid-template-columns: 1fr; }
  .calc-inputs { border-right: none; border-bottom: 1px solid var(--color-border); }
  .page-header h1 { font-size: 1.75rem; }
  .home-header h1 { font-size: 2rem; }
}