:root { color-scheme: light; font-family: system-ui, -apple-system, "Segoe UI", sans-serif; color: #203344; background: #f3f5f5; line-height: 1.7; }
* { box-sizing: border-box; }
body { margin: 0; padding: 24px 16px; }
.page { width: min(820px, 100%); margin: 0 auto; }
header, main, footer { background: #fff; border: 1px solid #dce4e8; border-radius: 16px; box-shadow: 0 12px 32px -18px rgba(24, 50, 75, .28); }
header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 16px 22px; }
.brand { display: flex; align-items: center; gap: 12px; color: #18324b; text-decoration: none; }
.brand img { width: 68px; height: 52px; object-fit: contain; }
.brand strong { display: block; font-size: 1.05rem; }
.brand span { display: block; color: #607181; font-size: .82rem; }
nav { display: flex; flex-wrap: wrap; gap: 4px 16px; }
nav a { display: inline-block; padding: 12px 4px; font-size: .9rem; font-weight: 650; }
a { color: #126d70; }
main { margin-top: 20px; padding: clamp(22px, 5vw, 48px); }
h1, h2 { color: #18324b; line-height: 1.25; }
h1 { margin: 0 0 8px; font-size: clamp(1.7rem, 5vw, 2.4rem); }
h2 { margin: 28px 0 8px; font-size: 1.25rem; }
.meta { color: #607181; font-size: .9rem; margin: 0 0 18px; }
.formula, .example { padding: 14px 18px; border-left: 4px solid #147d78; background: #f1f7f7; border-radius: 0 8px 8px 0; overflow-x: auto; }
.formula { font-family: "Cambria Math", "Times New Roman", serif; font-size: 1.1rem; }
.cta { display: inline-block; margin: 8px 0; padding: 14px 18px; min-height: 48px; border-radius: 8px; background: #18324b; color: #fff; font-weight: 700; text-decoration: none; }
.cta:hover, .cta:focus-visible { background: #10283e; }
.article-list { list-style: none; padding: 0; margin: 20px 0 0; display: grid; gap: 14px; }
.article-list li { padding: 16px 18px; border: 1px solid #dce4e8; border-radius: 12px; }
.article-list a { font-weight: 700; font-size: 1.05rem; }
.article-list p { margin: 6px 0 0; color: #526576; }
table { border-collapse: collapse; width: 100%; }
th, td { border: 1px solid #dce4e8; padding: 8px 12px; text-align: left; }
footer { margin-top: 20px; padding: 16px 22px; color: #526576; font-size: .9rem; }
footer a { display: inline-block; padding: 12px 4px; margin-right: 12px; }
@media (max-width: 560px) {
    body { padding: 12px; }
    header { align-items: flex-start; flex-direction: column; padding: 14px; }
    main { padding: 22px 18px; }
}