:root {
  --paper: #f4efe4;
  --card: #fbf8f1;
  --ink: #2b2a26;
  --muted: #6f6a5f;
  --line: #d9d0bd;
  --accent: #c2541f;
  --accent-soft: #f1d9c8;
  --green: #3d6b4f;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --serif: Georgia, "Times New Roman", "PT Serif", serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1c1b18;
    --card: #24231f;
    --ink: #ebe5d8;
    --muted: #a39d90;
    --line: #3a3832;
    --accent: #e8814d;
    --accent-soft: #3b2a20;
    --green: #8fc0a0;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.65;
}

a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--line);
  padding: 22px 0 18px;
}
.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
}
.brand img { width: 38px; height: 38px; }
.brand-name {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.01em;
}
.brand-tag {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  font-weight: 400;
}
.nav { font-family: var(--sans); font-size: 15px; }
.nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 18px;
}
.nav a:first-child { margin-left: 0; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }

/* Hero */
.hero { padding: 44px 0 20px; }
.freq {
  display: inline-block;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--green);
  border: 1px solid var(--green);
  border-radius: 3px;
  padding: 2px 8px;
  margin-bottom: 14px;
}
.hero h1 {
  font-family: var(--sans);
  font-size: clamp(28px, 6vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
}
.hero p { color: var(--muted); margin: 0; max-width: 34em; }

/* Post list */
.posts { list-style: none; padding: 0; margin: 28px 0 48px; }
.posts li {
  border-top: 1px dashed var(--line);
  padding: 22px 0;
}
.posts li:last-child { border-bottom: 1px dashed var(--line); }
.posts .meta {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
}
.posts h2 {
  font-family: var(--sans);
  font-size: 22px;
  line-height: 1.3;
  margin: 4px 0 6px;
}
.posts h2 a { color: var(--ink); text-decoration: none; }
.posts h2 a:hover { color: var(--accent); }
.posts p { margin: 0; }

/* Article */
article { padding: 36px 0 40px; }
article h1 {
  font-family: var(--sans);
  font-size: clamp(26px, 5.5vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 6px 0 10px;
}
article h2 {
  font-family: var(--sans);
  font-size: 22px;
  margin: 34px 0 8px;
}
article .meta {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
}
article .lead { font-size: 20px; color: var(--muted); }

.note {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  padding: 14px 18px;
  margin: 24px 0;
  border-radius: 0 4px 4px 0;
}
.note strong { font-family: var(--sans); }

table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 15px;
  margin: 18px 0;
  background: var(--card);
}
th, td {
  text-align: left;
  padding: 9px 10px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th { font-weight: 600; }
.table-scroll { overflow-x: auto; }

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 1px 5px;
}

.back {
  display: inline-block;
  margin-top: 30px;
  font-family: var(--sans);
  font-size: 15px;
}

/* 404 */
.lost { padding: 70px 0; text-align: center; }
.lost .code {
  font-family: var(--mono);
  font-size: 64px;
  color: var(--accent);
  line-height: 1;
}
.lost img { width: 96px; height: 96px; margin-bottom: 16px; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 22px 0 34px;
  font-family: var(--sans);
  font-size: 14px;
  color: var(--muted);
}
.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
}
.site-footer a { color: var(--muted); }

@media (max-width: 520px) {
  body { font-size: 17px; }
  .nav a { margin-left: 14px; }
}