:root {
  color-scheme: light;
  --ink: #172b3a;
  --muted: #5c6974;
  --line: #d9e0e6;
  --paper: #f7f4ef;
  --gold: #a7854d;
  --green: #2e7d4f;
  --blue: #3a6ea5;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: #ffffff;
}

header {
  background: var(--ink);
  color: #fffaf2;
  padding: 24px max(28px, calc((100vw - 1120px) / 2));
  border-bottom: 4px solid var(--gold);
}

main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 34px 28px 56px;
}

h1 {
  margin: 0;
  font-size: 28px;
  letter-spacing: 0;
}

h2 {
  margin: 32px 0 12px;
  font-size: 20px;
}

p {
  line-height: 1.65;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: #fff;
}

.card.phase0 {
  border-left: 6px solid var(--green);
}

.card.phase1 {
  border-left: 6px solid var(--blue);
}

.card.phase2 {
  border-left: 6px solid var(--gold);
}

.card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.card p {
  margin: 0 0 14px;
}

a {
  color: #1c5d8f;
  text-decoration: none;
  font-weight: 700;
}

a:hover {
  text-decoration: underline;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.links a {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 12px;
  background: var(--paper);
}

code {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 2px 5px;
}

.note {
  margin-top: 30px;
  padding: 14px 16px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
}