:root { --ink:#132421; --muted:#5f716b; --teal:#0a7c72; --teal-dark:#075f57; --paper:#fbfcf7; --mint:#eaf6f1; --cream:#fff7e7; --line:#dce7df; --max:900px; }
* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body { margin:0; color:var(--ink); background:linear-gradient(180deg,#eaf6f1 0,var(--paper) 30%,#fff 100%); font:16px/1.65 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif; overflow-x:hidden; }
a { color:var(--teal-dark); }
.shell { width:min(var(--max),calc(100% - 40px)); margin:0 auto; }
.site-header { border-bottom:1px solid var(--line); background:rgba(251,252,247,.95); }
.header-inner { display:flex; align-items:center; justify-content:space-between; gap:18px; min-height:72px; }
.brand { color:var(--ink); font-size:1.15rem; font-weight:900; text-decoration:none; }
.brand span { color:#3c8b2e; }
.header-links { display:flex; flex-wrap:wrap; gap:14px; font-size:.92rem; font-weight:750; }
.hero { padding:72px 0 38px; }
.eyebrow { margin:0 0 12px; color:var(--teal); font-size:.78rem; font-weight:900; letter-spacing:.12em; text-transform:uppercase; }
h1,h2,h3 { margin:0; line-height:1.16; letter-spacing:-.035em; }
h1 { max-width:820px; font-size:clamp(2.25rem,6vw,4.25rem); }
h2 { margin-top:42px; font-size:clamp(1.65rem,3vw,2.45rem); }
h3 { font-size:1.18rem; }
.lede { max-width:760px; margin-top:20px; color:var(--muted); font-size:clamp(1.05rem,2vw,1.2rem); }
.actions { display:flex; flex-wrap:wrap; gap:12px; margin-top:26px; }
.button { display:inline-flex; align-items:center; justify-content:center; min-height:46px; padding:10px 16px; border:1px solid var(--teal); border-radius:10px; background:var(--teal); color:#fff; font-weight:850; text-decoration:none; }
.button.secondary { background:#fff; color:var(--teal-dark); }
.content { padding:18px 0 72px; }
.content p { max-width:780px; margin:14px 0 0; }
.content ul,.content ol { max-width:780px; padding-left:24px; }
.content li + li { margin-top:8px; }
.formula { margin-top:22px; padding:20px 22px; border-left:4px solid var(--teal); border-radius:0 14px 14px 0; background:var(--mint); font-size:1.08rem; font-weight:800; }
.example { margin-top:22px; padding:22px; border:1px solid var(--line); border-radius:16px; background:#fff; }
.example p { margin-top:8px; }
.note { color:var(--muted); font-size:.94rem; }
.related { margin-top:42px; padding:24px; border-radius:18px; background:var(--cream); }
.related h2 { margin-top:0; font-size:1.5rem; }
.related-links { display:flex; flex-wrap:wrap; gap:12px 18px; margin-top:14px; }
.related-links a { font-weight:800; }
footer { padding:28px 0 48px; border-top:1px solid var(--line); color:var(--muted); font-size:.92rem; }
.footer-inner { display:flex; flex-wrap:wrap; justify-content:space-between; gap:14px; }
@media (max-width:620px) { .shell { width:min(var(--max),calc(100% - 28px)); } .header-inner { align-items:flex-start; padding:14px 0; } .header-links { justify-content:flex-end; gap:8px 12px; } .hero { padding:48px 0 24px; } .actions { flex-direction:column; align-items:stretch; } .button { width:100%; } }