:root {
  --ink: #111111;
  --paper: #f7f4ef;
  --accent: #cbff54;
  --muted: #615e59;
  --rule: rgba(17, 17, 17, .14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { background: var(--paper); color: var(--ink); font-family: Arial, Helvetica, sans-serif; margin: 0; }
a { color: inherit; }
.page { min-height: 100vh; overflow: hidden; }
.shell { margin: 0 auto; max-width: 1240px; padding: 0 32px; }
.nav { align-items: center; border-bottom: 1px solid var(--rule); display: flex; justify-content: space-between; min-height: 74px; }
.brand { font-size: 22px; font-weight: 800; letter-spacing: -.07em; text-decoration: none; }
.brand span { color: var(--accent-ink, var(--ink)); }
.eyebrow { font-size: 12px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.button { background: var(--ink); border: 1px solid var(--ink); border-radius: 999px; color: var(--paper); display: inline-block; font-size: 15px; font-weight: 700; padding: 14px 22px; text-decoration: none; transition: transform .15s ease; }
.button:hover { transform: translateY(-2px); }
.button.light { background: var(--accent); border-color: var(--accent); color: var(--ink); }
.hero { padding: 80px 0 48px; position: relative; }
.hero::after { background: var(--accent); border-radius: 50%; content: ""; filter: blur(1px); height: 44vw; max-height: 620px; opacity: .86; position: absolute; right: -18vw; top: -15vw; width: 44vw; z-index: -1; }
.hero-grid { align-items: end; display: grid; gap: 50px; grid-template-columns: minmax(0, 1.35fr) minmax(260px, .65fr); }
h1 { font-size: clamp(52px, 8vw, 116px); letter-spacing: -.085em; line-height: .9; margin: 18px 0 30px; max-width: 980px; }
.lede { font-size: 22px; line-height: 1.4; margin: 0; max-width: 580px; }
.account-card { backdrop-filter: blur(10px); background: color-mix(in srgb, var(--paper) 80%, transparent); border: 1px solid var(--rule); border-radius: 20px; padding: 28px; }
.account-mark { align-items: center; display: flex; font-size: 30px; font-weight: 800; letter-spacing: -.06em; min-height: 86px; }
.account-mark::before { background: var(--accent); border-radius: 50%; content: ""; display: inline-block; height: 14px; margin-right: 10px; width: 14px; }
.account-card p { color: var(--muted); line-height: 1.45; margin: 16px 0 0; }
.proof { border-bottom: 1px solid var(--rule); border-top: 1px solid var(--rule); display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 54px; }
.proof div { min-height: 128px; padding: 24px 18px; }
.proof div + div { border-left: 1px solid var(--rule); }
.proof strong { display: block; font-size: 30px; letter-spacing: -.06em; margin-bottom: 8px; }
.proof span { color: var(--muted); font-size: 14px; line-height: 1.3; }
.section { padding: 110px 0; }
.section.dark { background: var(--ink); color: var(--paper); }
.section-grid { display: grid; gap: 70px; grid-template-columns: minmax(200px, .6fr) minmax(0, 1.4fr); }
h2 { font-size: clamp(36px, 4vw, 64px); letter-spacing: -.07em; line-height: .95; margin: 16px 0 0; }
.principles { border-top: 1px solid currentColor; }
.principle { border-bottom: 1px solid currentColor; display: grid; gap: 24px; grid-template-columns: 80px 1fr; padding: 28px 0; }
.principle b { font-size: 13px; letter-spacing: .08em; }
.principle h3 { font-size: 26px; letter-spacing: -.045em; margin: 0 0 8px; }
.principle p { color: color-mix(in srgb, currentColor 68%, transparent); line-height: 1.5; margin: 0; max-width: 590px; }
.book { background: var(--accent); color: var(--ink); padding: 100px 0; }
.book-inner { align-items: end; display: flex; gap: 48px; justify-content: space-between; }
.book h2 { max-width: 680px; }
.book p { line-height: 1.5; max-width: 380px; }
.book .button { white-space: nowrap; }
.footer { color: var(--muted); display: flex; font-size: 13px; justify-content: space-between; padding: 26px 0; }

@media (max-width: 700px) {
  .shell { padding: 0 20px; }
  .nav { min-height: 66px; }
  .nav .button { padding: 10px 15px; }
  .hero { padding-top: 58px; }
  .hero-grid, .section-grid { grid-template-columns: 1fr; }
  .proof { grid-template-columns: 1fr; }
  .proof div + div { border-left: 0; border-top: 1px solid var(--rule); }
  .section { padding: 76px 0; }
  .principle { grid-template-columns: 48px 1fr; }
  .book-inner { align-items: start; flex-direction: column; }
  .footer { gap: 12px; }
}