:root {
  --ink: #1a1a1a;
  --paper: #fefefe;
  --accent: #1e4976;
  --muted: #6b7280;
  --rule: #d4d4d4;
  --surface: #f7f6f4;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: Georgia, 'Times New Roman', serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ── Site Header ── */
.site-header {
  border-bottom: 2px solid var(--ink);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 760px;
  margin: 0 auto;
}
.site-name {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
}
.site-name span {
  color: var(--accent);
}
.site-header nav a {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  margin-left: 24px;
}
.site-header nav a:hover { color: var(--ink); }

/* ── Container ── */
.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ── Index: Category chips ── */
.filter-bar {
  padding: 32px 0 16px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.chip {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 12px;
  padding: 4px 14px;
  border: 1px solid var(--rule);
  border-radius: 20px;
  background: none;
  cursor: pointer;
  color: var(--muted);
  letter-spacing: 0.03em;
}
.chip:hover, .chip.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ── Index: Article list ── */
.article-list { padding-bottom: 60px; }
.article-item {
  display: block;
  padding: 24px 0;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  color: inherit;
}
.article-item:hover h2 { color: var(--accent); }
.article-item .meta {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 6px;
  display: flex;
  gap: 12px;
  align-items: center;
}
.category-badge {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 1px 8px;
  font-size: 11px;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.article-item h2 {
  font-size: 20px;
  line-height: 1.3;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}
.article-item p {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.5;
}

/* ── Article page ── */
.article-wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px 80px;
}
.article-masthead {
  border-bottom: 2px solid var(--ink);
  padding: 32px 0 20px;
  margin-bottom: 40px;
}
.article-masthead .kicker {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 10px;
}
.article-masthead h1 {
  font-size: 38px;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}
.article-masthead .deck {
  font-size: 18px;
  color: var(--muted);
  font-style: italic;
  margin-bottom: 14px;
}
.article-masthead .byline {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 12px;
  color: var(--muted);
}

/* ── Author box ── */
.author-box {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 24px 0;
  margin: 48px 0 32px;
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
}
.author-box strong { color: var(--ink); }
.author-box a { color: var(--accent); }

/* ── Email capture ── */
.email-capture {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 24px;
  margin: 32px 0;
  text-align: center;
}
.email-capture p {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 14px;
}
.email-capture form {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}
.email-capture input[type="email"] {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 14px;
  padding: 8px 14px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  width: 240px;
  outline: none;
}
.email-capture input[type="email"]:focus { border-color: var(--accent); }
.email-capture button {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 20px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}
.email-capture button:hover { background: #16355a; }

/* ── About page ── */
.about-wrap {
  max-width: 680px;
  margin: 40px auto;
  padding: 0 20px 80px;
}
.about-wrap h1 {
  font-size: 32px;
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}
.about-wrap h2 {
  font-size: 18px;
  margin: 36px 0 12px;
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-size: 12px;
  color: var(--muted);
}
.about-wrap p {
  font-size: 17px;
  margin-bottom: 18px;
  line-height: 1.75;
}
.about-wrap a { color: var(--accent); }
.contact-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 8px;
}
.contact-links a {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 18px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  color: var(--accent);
  text-decoration: none;
}
.contact-links a:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ── 404 ── */
.not-found {
  text-align: center;
  padding: 100px 20px;
}
.not-found h1 {
  font-size: 80px;
  font-weight: 700;
  color: var(--rule);
  line-height: 1;
  margin-bottom: 16px;
}
.not-found p {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  color: var(--muted);
  margin-bottom: 24px;
}
.not-found a {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 13px;
  color: var(--accent);
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .article-masthead h1 { font-size: 26px; }
  .article-item h2 { font-size: 17px; }
  .email-capture form { flex-direction: column; align-items: center; }
  .email-capture input[type="email"] { width: 100%; max-width: 300px; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e8e6e1;
    --paper: #141414;
    --accent: #6fa8d4;
    --muted: #9ca3af;
    --rule: #2a2a2a;
    --surface: #1e1e1e;
  }
}