:root {
  color-scheme: dark;
  --ink: #f3efe4;
  --muted: #b7b1a2;
  --bg: #121410;
  --paper: #1c1f18;
  --line: rgba(243, 239, 228, 0.14);
  --lime: #e2f08a;
  --coral: #ffb087;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: auto;
  scroll-padding-bottom: 140px;
}

body {
  margin: 0;
  background:
    radial-gradient(900px 420px at 10% -10%, rgba(226, 240, 138, 0.16), transparent 60%),
    var(--bg);
  color: var(--ink);
  font-family: "Literata", "Iowan Old Style", Palatino, serif;
  font-size: 1.125rem;
  line-height: 1.6;
}

h1, h2, h3, .wordmark, .steps, .card strong, .cell {
  font-family: Syne, "Avenir Next", sans-serif;
  letter-spacing: -0.03em;
}

a { color: var(--lime); }

.wrap {
  width: min(880px, calc(100% - 48px));
  margin: 0 auto;
}

header.top {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: baseline;
  padding: 28px 0 8px;
  color: var(--muted);
  font-family: Syne, sans-serif;
  font-size: 0.95rem;
}

.wordmark { color: var(--ink); font-weight: 700; }

h1 {
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  line-height: 0.95;
  font-weight: 700;
  margin: 28px 0 12px;
}

.lede {
  font-size: 1.3rem;
  max-width: 38rem;
  color: var(--muted);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 32px 0 12px;
  padding: 0;
  list-style: none;
}

.steps li {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  min-height: 140px;
}

.steps span {
  display: block;
  color: var(--lime);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

h2 { font-size: 1.8rem; margin: 48px 0 8px; }

.note {
  color: var(--muted);
  margin-top: 0;
}

.strip {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-behavior: auto;
  padding: 8px 4px 18px;
  margin: 12px 0 8px;
}

.card {
  flex: 0 0 240px;
  height: 280px;
  border-radius: 18px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: #1a1c16;
  box-shadow: var(--shadow);
}

.card strong { font-size: 1.5rem; line-height: 1.1; }
.card em { font-style: normal; font-family: Syne, sans-serif; font-size: 0.85rem; }

.board {
  height: 380px;
  overflow: auto;
  scroll-behavior: auto;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: #171a14;
}

.board-canvas {
  width: 1680px;
  height: 980px;
  display: grid;
  grid-template-columns: repeat(12, 140px);
  grid-template-rows: repeat(7, 140px);
}

.cell {
  display: grid;
  place-items: center;
  border: 1px solid rgba(243, 239, 228, 0.08);
  color: var(--muted);
  font-size: 0.95rem;
}

.cell.mark {
  background: rgba(226, 240, 138, 0.16);
  color: var(--lime);
}

article p { margin: 0 0 1rem; }

footer {
  color: var(--muted);
  padding: 48px 0 180px;
  font-family: Syne, sans-serif;
  font-size: 0.9rem;
}

@media (max-width: 640px) {
  .steps { grid-template-columns: 1fr; }
  .steps li { min-height: 0; }
}