:root {
  --paper: #f2efe7;
  --ink: #1c211d;
  --muted: #686d66;
  --line: #cbc8be;
  --accent: #b6482d;
  --card: rgba(255, 255, 255, .34);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(28, 33, 29, .035) 1px, transparent 1px),
    var(--paper);
  background-size: 100% 32px;
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", sans-serif;
  line-height: 1.65;
}

a { color: inherit; }
.site-header, main, footer { width: min(1120px, calc(100% - 48px)); margin-inline: auto; }
.site-header {
  height: 92px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 700; letter-spacing: -.02em; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; color: var(--paper); background: var(--ink); font-size: 12px; letter-spacing: .08em; }
nav { display: flex; gap: 28px; }
nav a { color: var(--muted); text-decoration: none; font-size: 14px; }
nav a:hover { color: var(--accent); }

.hero { min-height: 650px; padding: 124px 0 110px; border-bottom: 1px solid var(--line); }
.eyebrow { margin: 0 0 20px; color: var(--accent); font-size: 12px; font-weight: 750; letter-spacing: .16em; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 850px; margin-bottom: 36px; font-family: ui-serif, Georgia, "Noto Serif SC", serif; font-size: clamp(52px, 8vw, 104px); line-height: 1.05; letter-spacing: -.055em; font-weight: 560; }
.intro { max-width: 650px; margin-bottom: 34px; color: var(--muted); font-size: 18px; }
.text-link { color: var(--accent); font-weight: 700; text-decoration: none; border-bottom: 1px solid currentColor; padding-bottom: 4px; }

.section { padding: 100px 0; border-bottom: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: 1fr 2fr; align-items: end; margin-bottom: 52px; }
.section-heading h2, .about-section h2 { margin-bottom: 0; font-family: ui-serif, Georgia, "Noto Serif SC", serif; font-size: clamp(36px, 5vw, 60px); font-weight: 560; letter-spacing: -.04em; }
.note-list { border-top: 1px solid var(--ink); }
.note-list article { display: grid; grid-template-columns: 1fr 2fr 60px; gap: 28px; padding: 32px 0; border-bottom: 1px solid var(--line); }
.note-list time, .note-no { color: var(--muted); font-size: 13px; }
.note-list h3 { margin-bottom: 7px; font-size: 19px; }
.note-list p { margin-bottom: 0; color: var(--muted); }
.note-no { text-align: right; }

.topic-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.topic-grid article { min-height: 280px; padding: 28px; background: var(--card); border: 1px solid var(--line); display: flex; flex-direction: column; }
.topic-grid span { color: var(--accent); font-size: 12px; }
.topic-grid h3 { margin: auto 0 12px; font-family: ui-serif, Georgia, serif; font-size: 32px; font-weight: 560; }
.topic-grid p { margin: 0; color: var(--muted); }
.about-section { display: grid; grid-template-columns: 1fr 2fr; gap: 32px; }
.about-section div > p { max-width: 600px; margin: 24px 0 0; color: var(--muted); font-size: 17px; }
footer { min-height: 150px; display: flex; justify-content: space-between; align-items: center; color: var(--muted); font-size: 13px; }

@media (max-width: 720px) {
  .site-header, main, footer { width: min(100% - 28px, 1120px); }
  nav { gap: 14px; }
  nav a:first-child { display: none; }
  .hero { min-height: auto; padding: 88px 0; }
  h1 { font-size: clamp(46px, 15vw, 72px); }
  .section { padding: 72px 0; }
  .section-heading, .about-section { grid-template-columns: 1fr; }
  .note-list article { grid-template-columns: 1fr; gap: 8px; }
  .note-no { display: none; }
  .topic-grid { grid-template-columns: 1fr; }
  .topic-grid article { min-height: 220px; }
  footer { flex-direction: column; justify-content: center; gap: 8px; align-items: flex-start; }
}