:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --text: #1c1b19;
  --muted: #6b675f;
  --rule: #e6e2d9;
  --accent: #b4461f;
  --accent-soft: #f6e7df;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151412;
    --surface: #1d1c19;
    --text: #ece8df;
    --muted: #9c978c;
    --rule: #2f2d29;
    --accent: #e8825a;
    --accent-soft: #2e211b;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 var(--sans);
  padding-inline: 20px;
}

.wrap { max-width: 720px; margin: 0 auto; }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

header.site {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 24px;
  padding-block: 28px;
  border-bottom: 1px solid var(--rule);
}

.logo {
  font-family: var(--mono);
  font-size: 15px;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.logo span { color: var(--accent); }

nav { display: flex; gap: 20px; font-size: 15px; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--text); }

.hero { padding-block: 72px 56px; }

h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.2; letter-spacing: -0.01em; }

h1 { font-size: clamp(34px, 6vw, 48px); margin: 0 0 20px; }

.lede { font-size: 20px; color: var(--muted); margin: 0; max-width: 34em; }

section { padding-block: 40px; border-top: 1px solid var(--rule); }

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0 0 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 28px;
}
.card h3 { font-size: 26px; margin: 0 0 10px; }
.card p { margin: 0 0 20px; }

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: 8px;
  overflow: hidden;
  margin: 0 0 22px;
}
.stat { background: var(--surface); padding: 14px 16px; }
.stat b { display: block; font-family: var(--serif); font-size: 26px; font-weight: 600; font-variant-numeric: tabular-nums; }
.stat small { color: var(--muted); font-size: 13px; line-height: 1.35; display: block; }

.links { display: flex; flex-wrap: wrap; gap: 10px 22px; font-size: 15px; }

ol.posts { list-style: none; margin: 0; padding: 0; counter-reset: post; }
ol.posts li {
  counter-increment: post;
  display: grid;
  grid-template-columns: 2.2em 1fr;
  gap: 4px;
  padding-block: 16px;
  border-bottom: 1px solid var(--rule);
}
ol.posts li:last-child { border-bottom: 0; }
ol.posts li::before { content: counter(post, decimal-leading-zero); font-family: var(--mono); font-size: 13px; color: var(--muted); padding-top: 4px; }
.post-title { font-family: var(--serif); font-size: 20px; line-height: 1.3; }
.post-sub { grid-column: 2; color: var(--muted); font-size: 15px; }

.soon {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 4px;
  padding: 1px 6px;
  margin-left: 8px;
  vertical-align: 3px;
}

footer { padding-block: 40px 56px; border-top: 1px solid var(--rule); color: var(--muted); font-size: 14px; }

/* ---------- series on home ---------- */
.series { margin-bottom: 36px; }
.series:last-child { margin-bottom: 0; }
.series-head { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 4px 16px; margin-bottom: 4px; }
.series-head h3 { font-size: 24px; margin: 0; }
.series-count { font-family: var(--mono); font-size: 12px; color: var(--muted); }
.series-desc { color: var(--muted); margin: 0 0 8px; }
.post-link { color: var(--text); text-decoration: none; }
.post-link:hover .post-title { color: var(--accent); }
.post-meta { grid-column: 2; font-family: var(--mono); font-size: 12px; color: var(--muted); margin-top: 4px; }

/* ---------- article ---------- */
.crumbs { font-family: var(--mono); font-size: 13px; color: var(--muted); padding-top: 40px; }
.crumbs a { color: var(--muted); }
article.post { padding-block: 16px 48px; }
article.post > header { padding-block: 16px 32px; border-bottom: 1px solid var(--rule); margin-bottom: 32px; }
article.post h1 { font-size: clamp(32px, 5.5vw, 44px); }
.byline { font-family: var(--mono); font-size: 13px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 4px 16px; margin-top: 16px; }
article.post h2 { font-size: 30px; margin: 56px 0 16px; scroll-margin-top: 24px; }
article.post h2 .num { font-family: var(--mono); font-size: 15px; color: var(--accent); display: block; margin-bottom: 6px; letter-spacing: 0; }
article.post h3 { font-size: 21px; margin: 32px 0 10px; }
article.post p, article.post li { max-width: 40em; }
article.post ul, article.post ol { padding-left: 1.3em; }
article.post li { margin-bottom: 6px; }
article.post strong { font-weight: 600; }
.te { font-family: "Noto Sans Telugu", "Kohinoor Telugu", "Telugu Sangam MN", var(--sans); }

.toc { background: var(--surface); border: 1px solid var(--rule); border-radius: 10px; padding: 18px 22px; margin: 0 0 16px; }
.toc p { margin: 0 0 8px; font-family: var(--mono); font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.toc ol { margin: 0; padding-left: 1.4em; font-size: 16px; }
.toc li { margin-bottom: 2px; }

.concept { border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 8px 8px 0; padding: 14px 18px; margin: 24px 0; }
.concept .label { display: block; font-family: var(--mono); font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: var(--accent); margin-bottom: 4px; }
.concept p { margin: 0 0 8px; } .concept p:last-child { margin-bottom: 0; }

.lesson { border: 1px solid var(--rule); background: var(--surface); border-radius: 8px; padding: 14px 18px; margin: 24px 0; }
.lesson .label { display: block; font-family: var(--mono); font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin-bottom: 4px; }
.lesson p { margin: 0; }

.table-wrap { overflow-x: auto; margin: 20px 0 24px; border: 1px solid var(--rule); border-radius: 8px; background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: 15px; font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 9px 14px; border-bottom: 1px solid var(--rule); white-space: nowrap; }
th { font-weight: 600; color: var(--muted); font-size: 13px; }
tr:last-child td { border-bottom: 0; }
td.num, th.num { text-align: right; }
tr.best td { font-weight: 600; }

pre { background: var(--surface); border: 1px solid var(--rule); border-radius: 8px; padding: 14px 16px; overflow-x: auto; font: 14px/1.55 var(--mono); margin: 20px 0; }
code { font-family: var(--mono); font-size: .88em; }
p code, li code, td code { background: var(--accent-soft); padding: 1px 5px; border-radius: 4px; }

figure { margin: 28px 0; }
figure .fig-body { background: var(--surface); border: 1px solid var(--rule); border-radius: 10px; padding: 18px; overflow-x: auto; }
figcaption { color: var(--muted); font-size: 14px; margin-top: 8px; }
svg text { font-family: var(--sans); }

.cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 24px 0; }
.btn { display: inline-block; border: 1px solid var(--rule); background: var(--surface); color: var(--text); text-decoration: none; border-radius: 8px; padding: 10px 16px; font-size: 15px; }
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { color: #fff; opacity: .9; }