:root {
  --bg: #fbfaf7;
  --paper: #ffffff;
  --ink: #191919;
  --muted: #66645f;
  --line: #d8d3c8;
  --accent: #225c56;
  --accent-soft: #eef4f1;
  --code: #f2efe8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
  font-size: 18px;
  line-height: 1.65;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--ink);
}

.site-header {
  align-items: baseline;
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 24px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1120px;
  padding: 24px 20px 18px;
}

.brand {
  align-items: baseline;
  color: var(--ink);
  display: inline-flex;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.96rem;
  font-weight: 700;
  gap: 10px;
  text-decoration: none;
}

.brand-mark {
  border: 1px solid var(--ink);
  display: inline-flex;
  font-size: 0.78rem;
  justify-content: center;
  min-width: 38px;
  padding: 2px 5px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.site-nav a {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.84rem;
  text-decoration: none;
}

.site-nav a[aria-current="page"],
.site-nav a:hover {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.nav-toggle {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
  display: none;
  font: inherit;
  padding: 4px 8px;
}

.hero,
.page-hero {
  border-bottom: 1px solid var(--line);
  margin: 0 auto;
  max-width: 1120px;
  padding: clamp(48px, 8vw, 92px) 20px clamp(34px, 6vw, 64px);
}

.hero-content {
  max-width: 820px;
}

.eyebrow,
.kicker,
.meta {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.78rem;
  letter-spacing: 0;
  margin: 0 0 12px;
  text-transform: none;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  font-size: clamp(2.55rem, 8vw, 5.9rem);
  font-weight: 520;
  line-height: 1;
  max-width: 900px;
}

h2 {
  font-size: clamp(1.45rem, 3vw, 2.3rem);
  font-weight: 520;
  line-height: 1.15;
}

h3 {
  font-size: 1.12rem;
  font-weight: 650;
  line-height: 1.25;
}

.hero-copy,
.page-hero p {
  color: var(--muted);
  font-size: clamp(1.08rem, 2vw, 1.28rem);
  margin-top: 20px;
  max-width: 780px;
}

.section,
.content {
  margin: 0 auto;
  max-width: 1120px;
  padding: clamp(36px, 6vw, 72px) 20px;
}

.notebook-grid {
  display: grid;
  gap: clamp(28px, 6vw, 72px);
  grid-template-columns: minmax(180px, 280px) minmax(0, 1fr);
}

.profile-note {
  border-top: 1px solid var(--ink);
  color: var(--muted);
  padding-top: 14px;
}

.index-list,
.post-list,
.research-list,
.tool-list {
  border-top: 1px solid var(--ink);
  display: grid;
}

.index-row,
.post-row,
.research-row,
.tool-row {
  border-bottom: 1px solid var(--line);
  display: grid;
  gap: 8px;
  padding: 22px 0;
}

.index-row h2,
.post-row h2,
.research-row h2,
.tool-row h2 {
  font-size: clamp(1.28rem, 2.5vw, 1.8rem);
}

.index-row p,
.post-row p,
.research-row p,
.tool-row p,
.content p,
.article p,
.article li {
  color: var(--muted);
}

.notes {
  border-top: 1px solid var(--line);
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(180px, 280px) minmax(0, 1fr);
}

.notes ul {
  color: var(--muted);
  display: grid;
  gap: 8px;
  list-style: square;
  margin: 0;
  padding-left: 20px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.tag {
  background: var(--code);
  border: 1px solid var(--line);
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.72rem;
  padding: 2px 7px;
}

.article {
  margin: 0 auto;
  max-width: 860px;
  padding: clamp(36px, 7vw, 78px) 20px;
}

.article h1 {
  font-size: clamp(2.1rem, 5vw, 4rem);
  margin-bottom: 22px;
}

.article h2 {
  border-top: 1px solid var(--line);
  font-size: clamp(1.35rem, 2.6vw, 1.9rem);
  margin-top: 36px;
  padding-top: 22px;
}

.article p {
  margin-top: 16px;
}

.article ul {
  display: grid;
  gap: 8px;
  margin: 16px 0 0;
  padding-left: 22px;
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  display: flex;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.78rem;
  gap: 16px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1120px;
  padding: 22px 20px 34px;
}

@media (max-width: 760px) {
  body {
    font-size: 17px;
  }

  .site-header {
    align-items: center;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    display: none;
    flex-direction: column;
    left: 0;
    padding: 14px 20px 18px;
    position: absolute;
    right: 0;
    top: 74px;
  }

  .site-nav.is-open {
    display: flex;
  }

  .notebook-grid,
  .notes {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-direction: column;
  }
}