@font-face { font-family: 'QRS Noto Sans SC'; src: url('fonts/NotoSansSC.woff') format('woff'); font-style: normal; font-weight: 100 900; font-display: swap; }
@font-face { font-family: 'QRS Noto Serif SC'; src: url('fonts/NotoSerifSC.woff') format('woff'); font-style: normal; font-weight: 200 900; font-display: swap; }
@font-face { font-family: 'QRS Frutiger'; src: url('fonts/Frutiger45Light.otf') format('opentype'); font-style: normal; font-weight: 300; font-display: swap; }
:root {
    --font-body: 'QRS Frutiger', 'QRS Noto Sans SC', 'Segoe UI', sans-serif;
    --font-sans: var(--font-body);
    --font-heading: 'Playfair Display', 'QRS Noto Serif SC', serif;
}
/* Frutiger is for body/UI text. Heading families and weights follow V1. */
body { font-weight: 300; }
input, select, button { font-family: var(--font-body); }
main[data-page="math_notes"] {
    --font-body: 'QRS Frutiger', 'QRS Noto Sans SC', 'Segoe UI', sans-serif;
    --font-sans: var(--font-body);
    --font-heading: var(--font-body);
    font-family: var(--font-body);
}
main[data-page="math_notes"] h2,
main[data-page="math_notes"] h3,
main[data-page="math_notes"] h4,
main[data-page="math_notes"] .font-serif { font-family: var(--font-body) !important; }
/* Serif is reserved for the site banner and the homepage society title. */
#header { --font-body: 'Playfair Display', 'QRS Noto Serif SC', serif; --font-sans: var(--font-body); --font-heading: var(--font-body); }
main { --font-heading: 'QRS Frutiger', 'QRS Noto Sans SC', 'Segoe UI', sans-serif; }
main h1, main h2, main h3, main h4,
main .section-title, main .card-title, main .publication-title { font-weight: 300; }
main .hero-title { font-family: 'Playfair Display', 'QRS Noto Serif SC', serif !important; font-weight: 700; }
main .hero-subtitle { font-family: var(--font-body); }
main[data-page="math_notes"] h1 { font-family: var(--font-body) !important; }
/* Keep editorial titles light even when a template adds font-bold utilities. */
main .section-title,
main .publication-year,
main h2,
main h3,
main h4 {
    font-family: 'QRS Frutiger', 'QRS Noto Sans SC', 'Segoe UI', sans-serif !important;
    font-weight: 300 !important;
    font-synthesis: none;
}
#site-footer { --font-heading: var(--font-body); }