:root {
  --ink: #0f2233;
  --muted: #4d6273;
  --line: #d8e1e8;
  --paper: #ffffff;
  --mist: #f3f6f8;
  --sea: #0b5e7a;
  --sea-dark: #084a60;
  --signal: #e8f3f6;
  --radius: 10px;
  --wrap: 1080px;
  font-size: 17px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--sea); }
a:hover { color: var(--sea-dark); }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.wrap.narrow { max-width: 720px; }

.site-header { border-bottom: 1px solid var(--line); background: var(--paper); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.site-header nav { display: flex; gap: 24px; white-space: nowrap; }
.site-header nav a { color: var(--muted); text-decoration: none; font-size: 0.94rem; }
.site-header nav a:hover { color: var(--ink); }

.wordmark { font-weight: 700; font-size: 1.25rem; letter-spacing: -0.01em; color: var(--ink); text-decoration: none; margin: 0; }
.wordmark span { color: var(--sea); }
.wordmark.small { font-size: 1.05rem; }

.hero { padding: 88px 0 72px; background: linear-gradient(180deg, var(--signal) 0%, var(--paper) 100%); }
.eyebrow { text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.78rem; font-weight: 600; color: var(--sea); margin: 0 0 16px; }
h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 20px; max-width: 16ch; }
.lead { font-size: 1.18rem; color: var(--muted); max-width: 60ch; margin: 0 0 32px; }

.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button {
  display: inline-block; padding: 12px 20px; border-radius: 8px; border: 1px solid var(--line);
  color: var(--ink); background: var(--paper); text-decoration: none; font-weight: 600; font-size: 0.97rem;
}
.button:hover { border-color: var(--sea); color: var(--sea-dark); }
.button.primary { background: var(--sea); border-color: var(--sea); color: #fff; }
.button.primary:hover { background: var(--sea-dark); border-color: var(--sea-dark); color: #fff; }

section { padding: 64px 0; }
.problem { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.grid.three { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.problem h2 { font-size: 1.1rem; margin: 0 0 8px; }
.problem p { margin: 0; color: var(--muted); }

.section-title { font-size: 1.7rem; letter-spacing: -0.01em; margin: 0 0 32px; }

.steps { list-style: none; counter-reset: step; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px 48px; }
.steps li { counter-increment: step; position: relative; padding-left: 52px; }
.steps li::before {
  content: counter(step); position: absolute; left: 0; top: 0; width: 34px; height: 34px; border-radius: 50%;
  background: var(--signal); color: var(--sea-dark); font-weight: 700; display: grid; place-items: center;
}
.steps h3 { margin: 4px 0 6px; font-size: 1.05rem; }
.steps p { margin: 0; color: var(--muted); }

.sample { background: var(--mist); }
.card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px 28px; max-width: 720px; }
.card-row { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.card-title { font-weight: 700; font-size: 1.1rem; }
.badge { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; padding: 4px 10px; border-radius: 999px; }
.badge.required { background: #e3f1e8; color: #1d6b3a; }
.card dl { margin: 0; }
.card dl div { display: grid; grid-template-columns: 110px 1fr; gap: 12px; padding: 8px 0; border-top: 1px solid var(--line); }
.card dt { color: var(--muted); font-size: 0.92rem; }
.card dd { margin: 0; }
.card-note { margin: 16px 0 0; font-size: 0.85rem; color: var(--muted); }

.survey h2 { font-size: 1.7rem; margin: 0 0 12px; }
.survey p { color: var(--muted); margin: 0 0 24px; }

.prose { padding-top: 56px; padding-bottom: 72px; }
.prose h1 { font-size: 2.2rem; max-width: none; }
.prose h2 { font-size: 1.2rem; margin: 36px 0 8px; }
.prose p { color: var(--ink); }
.updated { color: var(--muted); font-size: 0.92rem; }

.site-footer { border-top: 1px solid var(--line); padding: 32px 0 48px; font-size: 0.9rem; color: var(--muted); }
.footer-inner { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.site-footer p { margin: 0 0 8px; }

@media (max-width: 760px) {
  :root { font-size: 16px; }
  .hero { padding: 56px 0 48px; }
  .grid.three, .steps { grid-template-columns: 1fr; gap: 28px; }
  .site-header nav { gap: 16px; }
  .card { padding: 20px; }
  .card dl div { grid-template-columns: 1fr; gap: 2px; }
}

@media (max-width: 480px) {
  .nav-optional { display: none; }
}