:root {
  --ink: #111012;
  --muted: #6b646a;
  --paper: #fbfaf8;
  --line: rgba(17, 16, 18, 0.12);
  --petal: #e54f88;
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 8%, rgba(255, 205, 224, 0.58), transparent 27rem),
    radial-gradient(circle at 90% 80%, rgba(255, 238, 214, 0.7), transparent 30rem),
    var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", sans-serif;
  -webkit-font-smoothing: antialiased;
}

main { width: min(100% - 2rem, 48rem); margin: 0 auto; padding: 4rem 0; }
nav { display: flex; gap: 1rem; margin-bottom: 3rem; }
a { color: var(--ink); text-underline-offset: 0.2em; }
h1 { margin: 0; font-size: clamp(2.4rem, 7vw, 4.5rem); letter-spacing: -0.055em; }
h2 { margin: 2.25rem 0 0.65rem; font-size: 1.25rem; }
p, li { color: var(--muted); line-height: 1.72; }
strong { color: var(--ink); }
.effective { color: var(--petal); font-weight: 700; }
.card { margin-top: 2rem; padding: clamp(1.3rem, 4vw, 2rem); border: 1px solid var(--line); border-radius: 1.4rem; background: rgba(255,255,255,0.72); }
.card h2:first-child { margin-top: 0; }