/* ---------- design tokens ---------- */
:root {
  --bg: #fbfbfa;
  --bg-elev: #ffffff;
  --bg-code: #1f2330;
  --fg: #181a20;
  --fg-muted: #585d6b;
  --fg-dim: #8a8f9e;
  --accent: #d8472b;
  --accent-soft: rgba(216, 71, 43, 0.08);
  --rule: #e7e5e0;
  --rule-strong: #c8c5be;
  --warn: #b87a00;
  --good: #197a4d;
  --code-fg: #e6e6e6;
  --code-comment: #8b95a3;
  --code-string: #d3a8a0;
  --code-keyword: #f59e6c;
  --code-fn: #84a8ff;
  --code-type: #b4d3a3;
  --shadow: 0 1px 0 rgba(20, 24, 32, 0.04), 0 4px 14px rgba(20, 24, 32, 0.06);

  --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, "Roboto Mono", monospace;
  --font-display: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  --w-wide: 1180px;
  --w-text: 760px;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--w-wide); margin: 0 auto; padding: 0 24px; }
.container--narrow { max-width: var(--w-text); margin: 0 auto; padding: 0 24px; }

/* ---------- header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(251, 251, 250, 0.94);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--rule);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.site-header__brand {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  color: var(--fg);
  font-weight: 700;
  font-family: var(--font-display);
  letter-spacing: -0.01em;
}
.site-header__brand:hover { text-decoration: none; }
.site-header__title { font-size: 18px; }
.site-header__title-accent { color: var(--accent); }
.site-header__version {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-dim);
  padding: 2px 6px;
  border: 1px solid var(--rule-strong);
  border-radius: 4px;
}
.site-nav { display: flex; gap: 22px; align-items: center; }
.site-nav__link {
  color: var(--fg-muted);
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font-display);
}
.site-nav__link:hover { color: var(--fg); text-decoration: none; }
.site-nav__link--github { color: var(--fg); }

@media (max-width: 640px) {
  .site-nav { gap: 14px; }
  .site-nav__link { font-size: 13px; }
  .site-header__version { display: none; }
}

/* ---------- main ---------- */
.site-main { padding: 0 0 96px; min-height: calc(100vh - 56px - 320px); }

/* ---------- hero ---------- */
.hero {
  padding: 96px 0 56px;
  border-bottom: 1px solid var(--rule);
  background:
    radial-gradient(ellipse 800px 360px at 70% -20%, var(--accent-soft), transparent 60%),
    linear-gradient(to bottom, #ffffff, var(--bg));
}
.hero__inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.hero__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 16px;
}
.hero__title {
  font-size: 52px;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
  font-weight: 700;
  font-family: var(--font-display);
}
.hero__title em { font-style: normal; color: var(--accent); }
.hero__subtitle {
  font-size: 19px;
  line-height: 1.5;
  color: var(--fg-muted);
  margin: 0 0 28px;
  max-width: 560px;
}
.hero__buttons { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 14px;
  font-family: var(--font-display);
  border: 1px solid transparent;
  transition: background 120ms ease, border-color 120ms ease, transform 120ms ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn--primary { background: var(--fg); color: var(--bg-elev); }
.btn--primary:hover { background: #2a2e3a; }
.btn--ghost { background: transparent; color: var(--fg); border-color: var(--rule-strong); }
.btn--ghost:hover { border-color: var(--fg); }

.hero__code {
  background: var(--bg-code);
  color: var(--code-fg);
  border-radius: 10px;
  padding: 22px 24px;
  box-shadow: var(--shadow);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.65;
}
.hero__code pre { margin: 0; }
.hero__code .c-kw { color: var(--code-keyword); }
.hero__code .c-fn { color: var(--code-fn); }
.hero__code .c-st { color: var(--code-string); }
.hero__code .c-ty { color: var(--code-type); }
.hero__code .c-cm { color: var(--code-comment); }

@media (max-width: 880px) {
  .hero { padding: 56px 0 40px; }
  .hero__inner { grid-template-columns: 1fr; gap: 32px; }
  .hero__title { font-size: 36px; }
  .hero__subtitle { font-size: 17px; }
}

/* ---------- section ---------- */
.section { padding: 80px 0; border-bottom: 1px solid var(--rule); }
.section--quiet { background: var(--bg-elev); }
.section__title {
  font-size: 14px;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 16px;
}
.section__heading {
  font-size: 32px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
  font-weight: 700;
  font-family: var(--font-display);
}
.section__lede {
  font-size: 18px;
  color: var(--fg-muted);
  max-width: 720px;
  margin: 0 0 40px;
}

/* feature grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
@media (max-width: 880px) { .feature-grid { grid-template-columns: 1fr; gap: 20px; } }
.feature {
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 24px;
  transition: border-color 150ms ease, transform 150ms ease;
}
.feature:hover { border-color: var(--rule-strong); transform: translateY(-2px); }
.feature__icon {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.feature__title { font-size: 17px; font-weight: 600; margin: 0 0 10px; font-family: var(--font-display); }
.feature__body { color: var(--fg-muted); font-size: 15px; line-height: 1.6; margin: 0; }

/* combinator pills */
.combinator-list {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin-top: 24px;
}
.combinator {
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 5px 12px;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  color: var(--fg);
  background: var(--bg-elev);
}

/* metrics table */
.metrics {
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  border-radius: 10px;
  overflow: hidden;
}
.metrics table { width: 100%; border-collapse: collapse; font-size: 14px; }
.metrics th, .metrics td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-mono);
}
.metrics th { background: #f6f5f1; font-weight: 600; color: var(--fg-muted); }
.metrics tr:last-child td { border-bottom: none; }
.metrics .row-async td { background: rgba(25, 122, 77, 0.04); }
.metrics .gap-strong { color: var(--accent); font-weight: 700; }

/* code (general) */
pre, code { font-family: var(--font-mono); }
code {
  background: rgba(20, 24, 32, 0.06);
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 0.9em;
}
pre {
  background: var(--bg-code);
  color: var(--code-fg);
  padding: 18px 20px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.6;
}
pre code { background: none; padding: 0; color: inherit; font-size: inherit; }

/* highlight.rb / rouge syntax */
.highlight { background: var(--bg-code) !important; border-radius: 8px; }
.highlight pre { margin: 0; background: transparent !important; }
.highlight .k, .highlight .kd, .highlight .kt, .highlight .kn { color: var(--code-keyword); }
.highlight .s, .highlight .s1, .highlight .s2, .highlight .se { color: var(--code-string); }
.highlight .c, .highlight .c1, .highlight .cm { color: var(--code-comment); font-style: italic; }
.highlight .nf, .highlight .nx, .highlight .py { color: var(--code-fn); }
.highlight .nc, .highlight .nt { color: var(--code-type); }
.highlight .n, .highlight .na { color: var(--code-fg); }
.highlight .mi, .highlight .mf, .highlight .mh { color: var(--code-keyword); }

/* ---------- post body ---------- */
.post { padding: 64px 0; }
.post__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.post__title {
  font-size: 38px;
  line-height: 1.18;
  letter-spacing: -0.015em;
  margin: 0 0 12px;
  font-weight: 700;
  font-family: var(--font-display);
}
.post__subtitle {
  font-size: 19px;
  color: var(--fg-muted);
  margin: 0 0 18px;
}
.post__meta {
  font-size: 13px;
  color: var(--fg-dim);
  font-family: var(--font-mono);
  margin-bottom: 36px;
  display: flex;
  gap: 10px;
}
.post__dot { color: var(--rule-strong); }
.post__header { margin-bottom: 32px; padding-bottom: 24px; border-bottom: 1px solid var(--rule); }
.post__body { font-size: 17px; line-height: 1.72; color: var(--fg); }
.post__body p { margin: 0 0 1.1em; }
.post__body h2 {
  font-size: 24px;
  font-weight: 700;
  font-family: var(--font-display);
  letter-spacing: -0.01em;
  margin: 56px 0 16px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
}
.post__body h3 {
  font-size: 19px;
  font-weight: 600;
  font-family: var(--font-display);
  margin: 36px 0 12px;
}
.post__body h4 { font-size: 16px; font-weight: 600; margin: 28px 0 10px; color: var(--fg-muted); text-transform: uppercase; letter-spacing: 0.04em; }
.post__body blockquote {
  margin: 24px 0;
  padding: 14px 22px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  color: var(--fg-muted);
  font-style: italic;
  border-radius: 0 6px 6px 0;
}
.post__body ul, .post__body ol { padding-left: 1.6em; }
.post__body li { margin-bottom: 0.5em; }
.post__body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: 24px 0;
  font-family: var(--font-mono);
}
.post__body th, .post__body td {
  border: 1px solid var(--rule);
  padding: 8px 12px;
  text-align: left;
}
.post__body th { background: #f6f5f1; font-weight: 600; }
.post__body strong { color: var(--fg); font-weight: 600; }
.post__body em { font-style: italic; color: var(--fg-muted); }
.post__body hr { border: none; border-top: 1px solid var(--rule); margin: 48px 0; }
.post__footer {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  color: var(--fg-muted);
  font-size: 14px;
}

/* ---------- blog index ---------- */
.blog-index { padding: 64px 0; }
.blog-index__heading {
  font-size: 32px;
  font-weight: 700;
  font-family: var(--font-display);
  letter-spacing: -0.01em;
  margin: 0 0 12px;
}
.blog-index__lede { color: var(--fg-muted); font-size: 17px; margin: 0 0 40px; }
.post-list { list-style: none; padding: 0; margin: 0; }
.post-card {
  padding: 24px 0;
  border-bottom: 1px solid var(--rule);
}
.post-card:last-child { border-bottom: none; }
.post-card__date { font-family: var(--font-mono); font-size: 12px; color: var(--fg-dim); letter-spacing: 0.04em; }
.post-card__title {
  display: block;
  font-size: 20px;
  font-weight: 700;
  font-family: var(--font-display);
  color: var(--fg);
  margin: 6px 0 8px;
  letter-spacing: -0.01em;
}
.post-card__title:hover { color: var(--accent); text-decoration: none; }
.post-card__subtitle { color: var(--fg-muted); font-size: 15px; margin: 0; }

/* ---------- examples page ---------- */
.example { margin: 56px 0; }
.example__heading { font-size: 22px; font-weight: 600; font-family: var(--font-display); margin: 0 0 8px; }
.example__lede { color: var(--fg-muted); font-size: 16px; margin: 0 0 18px; }

/* ---------- footer ---------- */
.site-footer {
  background: var(--bg-elev);
  border-top: 1px solid var(--rule);
  padding: 48px 0 32px;
  color: var(--fg-muted);
  font-size: 14px;
}
.site-footer__inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 40px;
}
@media (max-width: 880px) { .site-footer__inner { grid-template-columns: 1fr; gap: 24px; } }
.site-footer__title {
  font-family: var(--font-display);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 12px;
}
.site-footer__lede { font-size: 14px; line-height: 1.55; margin: 0 0 12px; }
.site-footer__copy { font-size: 13px; color: var(--fg-dim); margin: 0; }
.site-footer__links { list-style: none; padding: 0; margin: 0; }
.site-footer__links li { margin-bottom: 8px; }
.site-footer__snippet {
  background: var(--bg-code);
  color: var(--code-fg);
  border-radius: 6px;
  padding: 12px 14px;
  font-size: 12px;
  line-height: 1.55;
  overflow-x: auto;
  margin: 0;
}
.site-footer__snippet code { background: transparent; padding: 0; color: inherit; font-size: inherit; }

/* ---------- 404 ---------- */
.page-404 {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 120px 24px;
}
.page-404 h1 { font-size: 72px; margin: 0 0 12px; font-family: var(--font-display); }
.page-404 p { font-size: 18px; color: var(--fg-muted); }