:root {
  color-scheme: light;
  --ink: #102c28;
  --muted: #526763;
  --paper: #f6f2e9;
  --card: #fffdf8;
  --accent: #df7654;
  --line: #d8ded9;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: Inter, ui-sans-serif, system-ui, sans-serif; }
header, main { width: min(920px, calc(100% - 32px)); margin-inline: auto; }
header { padding: 72px 0 36px; }
h1, h2 { font-family: Georgia, serif; line-height: 1.04; margin: 0; }
h1 { max-width: 760px; font-size: clamp(2.5rem, 7vw, 5rem); }
h2 { font-size: clamp(1.7rem, 4vw, 2.6rem); }
.demo-nav { display: flex; gap: 8px; margin-bottom: 48px; }
.demo-nav a, .demo-nav span { border: 1px solid var(--line); border-radius: 999px; padding: 9px 14px; color: var(--ink); font-size: .88rem; font-weight: 750; text-decoration: none; }
.demo-nav a:hover, .demo-nav a:focus-visible { border-color: var(--accent); outline: none; }
.demo-nav [aria-current="page"] { background: var(--ink); border-color: var(--ink); color: white; }
.eyebrow { color: #37645c; font-size: .76rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.lede { max-width: 720px; color: var(--muted); font-size: 1.15rem; line-height: 1.7; }
.persona-help { max-width: 520px; color: var(--muted); line-height: 1.55; }
.warning, .personas, .lab-card, .adapter { border: 1px solid var(--line); border-radius: 20px; background: var(--card); }
.warning { display: flex; gap: 12px; padding: 18px 22px; background: #fff2df; }
.personas { display: flex; justify-content: space-between; gap: 20px; align-items: center; padding: 24px; margin: 18px 0; }
.persona-buttons, .actions { display: flex; gap: 10px; flex-wrap: wrap; }
button { border: 1px solid var(--line); border-radius: 999px; padding: 13px 18px; background: white; color: var(--ink); cursor: pointer; font: inherit; font-weight: 700; }
button:hover, button:focus-visible, .choice.selected { border-color: var(--accent); box-shadow: 0 0 0 3px rgb(223 118 84 / 15%); outline: none; }
.lab-card { padding: clamp(24px, 5vw, 52px); min-height: 430px; }
.step { color: var(--muted); font-weight: 700; }
.choices { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 36px 0; }
.choice { border-radius: 14px; min-height: 88px; }
.actions { justify-content: space-between; }
.primary { background: var(--accent); color: white; border-color: var(--accent); }
button:disabled { opacity: .4; cursor: not-allowed; }
.metrics { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin: 28px 0; }
.metrics article { padding: 20px; border-radius: 14px; background: #edf2ef; }
.metrics span { display: block; font-family: Georgia, serif; font-size: 2rem; }
.metrics small { display: block; color: var(--muted); margin-top: 5px; }
.disclaimer { padding: 16px; border-left: 4px solid var(--accent); background: #fff4ee; }
.adapter { margin: 18px 0 72px; padding: 24px; }
[hidden] { display: none !important; }

@media (max-width: 700px) {
  header { padding-top: 42px; }
  .personas { align-items: flex-start; flex-direction: column; }
  .choices, .metrics { grid-template-columns: 1fr; }
  .warning { flex-direction: column; }
}