* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: #f4f7f5; color: #103f4a; font: 17px/1.7 system-ui, -apple-system, sans-serif; }
a { color: inherit; text-underline-offset: 4px; overflow-wrap: anywhere; }
a:focus-visible { outline: 3px solid #2f8f79; outline-offset: 5px; }
header, main, footer { max-width: 860px; margin: auto; padding: 24px; }
header { display: flex; justify-content: space-between; gap: 20px; align-items: center; }
.brand { display: flex; align-items: center; gap: 10px; font-size: 26px; font-weight: 800; letter-spacing: -1px; text-decoration: none; }
.brand img { width: 38px; height: 38px; border-radius: 10px; }
nav { display: flex; flex-wrap: wrap; gap: 16px; font-size: 14px; }
.hero { background: #071f2a; color: #f4f7f5; padding: 40px; border-radius: 28px; margin: 8px 0 30px; }
.eyebrow { color: #86e0c2; font-size: 12px; letter-spacing: 2px; font-weight: 700; }
h1 { font-size: clamp(30px, 6vw, 46px); line-height: 1.1; letter-spacing: -1.5px; margin: 16px 0; }
h2 { font-size: 23px; line-height: 1.25; margin: 0 0 16px; }
p { margin: 12px 0; }
section { background: white; border: 1px solid #dce8e4; border-radius: 20px; padding: 26px; margin: 16px 0; scroll-margin-top: 20px; }
.toc { display: grid; gap: 8px; font-size: 15px; }
.meta, footer { font-size: 13px; color: #5f7378; }
.button { display: inline-block; background: #103f4a; color: white; border-radius: 14px; padding: 12px 20px; text-decoration: none; margin: 8px 0; }
.notice { border-left: 4px solid #2f8f79; padding: 12px 16px; background: #e7f7f1; border-radius: 8px; }
.skip { position: absolute; left: -10000px; }
.skip:focus { left: 16px; top: 16px; background: white; padding: 10px; }
footer { padding-bottom: 44px; border-top: 1px solid #dce8e4; }
@media (max-width: 520px) {
  header, main, footer { padding: 18px; }
  header { align-items: flex-start; flex-direction: column; gap: 6px; }
  .hero { padding: 26px; }
  section { padding: 20px; }
  body { font-size: 16px; }
}