@font-face{font-family:Manrope;src:url(fonts/ManropeVariable.woff2) format('woff2');font-display:swap;font-weight:200 800}
:root{color-scheme:light;--ink:#18202b;--muted:#566172;--line:#dce2e9;--accent:#245acb;--paper:#f7f8fa;--radius:14px}
*{box-sizing:border-box}html{scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.7 Manrope,system-ui,sans-serif}a{color:var(--accent);text-underline-offset:4px}a:focus-visible{outline:3px solid var(--accent);outline-offset:4px;border-radius:4px}header,footer{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;max-width:1120px;margin:auto;padding:24px}header{border-bottom:1px solid var(--line)}header nav,footer{display:flex;flex-wrap:wrap;gap:12px 24px}header nav a,footer a{display:inline-flex;align-items:center;min-height:44px}header nav a{text-decoration:none;color:var(--ink)}.wordmark{display:flex;align-items:center;gap:8px;text-decoration:none;color:var(--ink);font-weight:600;letter-spacing:.07em}.wordmark b{font-weight:800}main{max-width:960px;padding:48px 24px 64px;margin:auto;min-width:0}h1{font-size:clamp(2rem,5vw,3.5rem);line-height:1.2;letter-spacing:-.045em;max-width:850px;margin:16px 0 24px;text-wrap:balance}h2{font-size:1.4rem;line-height:1.35;letter-spacing:-.025em}p,li{max-width:78ch}.eyebrow{font-size:.8rem;font-weight:800;letter-spacing:.07em;color:var(--muted)}.lead{font-size:1.2rem;line-height:1.65}.english-title,.note{color:var(--muted)}.button{display:inline-flex;align-items:center;justify-content:center;gap:16px;min-height:48px;padding:12px 20px;background:var(--accent);color:white;font-weight:750;text-decoration:none;border-radius:12px;margin:16px 0 24px}.button:hover{background:#17459f}section{margin-top:40px;padding-top:24px;border-top:1px solid var(--line)}li{padding-block:6px}.formula{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px;overflow:auto}.formula .katex{font-size:1.1em}.formula .katex-display{margin:.5em 0}.skip{position:fixed;left:16px;top:-80px;z-index:2;background:white;padding:12px}.skip:focus{top:12px}.back{display:inline-flex;align-items:center;min-height:44px}.catalog-list{list-style:none;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.catalog-list li{padding:0;min-width:0}.catalog-list a{display:grid;grid-template-columns:1fr auto;gap:4px 12px;min-height:100%;padding:18px;border:1px solid var(--line);border-radius:var(--radius);background:white;text-decoration:none;color:var(--ink);height:100%}.catalog-list a:hover{border-color:var(--accent)}.catalog-list small{grid-column:1;color:var(--muted)}.catalog-list a>span:last-child{grid-column:2;grid-row:1/3;align-self:center}.grade-nav{display:flex;gap:12px;flex-wrap:wrap}.grade-nav a{padding:10px 16px;border:1px solid var(--line);border-radius:10px;min-height:44px}.locale-link{font-size:.9rem}footer{border-top:1px solid var(--line);font-size:.9rem}.note{padding:16px;border-left:3px solid var(--line)}@media(max-width:600px){header,footer{padding:16px}main{padding:32px 20px 48px}.catalog-list{grid-template-columns:1fr}header{gap:8px}header nav{gap:8px 16px}.formula{padding:10px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}@media print{header,footer,.button,.back,.skip{display:none}body{background:white}main{padding:0;max-width:none}.formula{overflow:visible}}