:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
  color: #202020;
  background: #f4f4f1;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  line-height: 1.8;
}

.memo {
  width: min(820px, calc(100% - 32px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 64px 72px 120px;
  background: #fff;
}

.memo-header {
  padding-bottom: 28px;
  border-bottom: 1px solid #d8d8d2;
}

.label,
.updated {
  margin: 0;
  color: #777;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
}

h1 {
  margin: 8px 0 4px;
  font-size: clamp(1.55rem, 4vw, 2.1rem);
  line-height: 1.4;
}

section {
  padding: 34px 0;
  border-bottom: 1px solid #e8e8e3;
}

h2 {
  margin: 0 0 16px;
  font-size: 1.15rem;
}

h3 {
  margin: 24px 0 6px;
  font-size: 1rem;
}

p,
ul {
  margin: 8px 0;
}

ul {
  padding-left: 1.4em;
}

.note-block {
  margin-top: 14px;
  padding: 2px 20px 18px;
  border-left: 3px solid #d2d2cc;
}

.timeline {
  margin: 0;
}

.timeline div {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  padding: 10px 0;
}

.timeline dt {
  color: #666;
  font-size: 0.9rem;
}

.timeline dd {
  margin: 0;
}

.free-note {
  min-height: 180px;
  padding: 18px;
  background: #fafaf7;
}

@media (max-width: 640px) {
  .memo {
    width: 100%;
    padding: 36px 22px 80px;
  }

  .timeline div {
    grid-template-columns: 1fr;
    gap: 0;
  }
}