/* Apple-inspired design: system SF font, frosted nav, generous space, soft surfaces. */
:root {
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --card: #ffffff;
  --ink: #1d1d1f;
  --ink-2: #424245;
  --muted: #6e6e73;
  --line: #d2d2d7;
  --line-soft: #e8e8ed;
  --accent: #0066cc;
  --accent-hover: #0077ed;
  --code-bg: #f5f5f7;
  --nav-bg: rgba(255, 255, 255, 0.72);
  --shadow: 0 2px 6px rgba(0, 0, 0, 0.04), 0 12px 32px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.06), 0 24px 48px rgba(0, 0, 0, 0.10);
  --radius: 18px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --bg-alt: #161617;
    --card: #1c1c1e;
    --ink: #f5f5f7;
    --ink-2: #d1d1d6;
    --muted: #a1a1a6;
    --line: #424245;
    --line-soft: #2c2c2e;
    --accent: #2997ff;
    --accent-hover: #47a6ff;
    --code-bg: #1c1c1e;
    --nav-bg: rgba(22, 22, 23, 0.72);
    --shadow: 0 0 0 1px rgba(255, 255, 255, 0.06);
    --shadow-hover: 0 0 0 1px rgba(255, 255, 255, 0.14), 0 24px 48px rgba(0, 0, 0, 0.5);
  }
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.47;
  letter-spacing: -0.022em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; text-underline-offset: 3px; }

.wrap { max-width: 980px; margin: 0 auto; padding: 0 22px; }

/* ---------- Frosted nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--nav-bg);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--line-soft);
}
.header-row { display: flex; align-items: center; justify-content: space-between; height: 52px; }
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--ink); font-weight: 600; font-size: 17px; letter-spacing: -0.01em;
}
.brand:hover { color: var(--ink); text-decoration: none; }
.brand-mark {
  display: inline-grid; place-items: center;
  width: 28px; height: 28px; border-radius: 8px;
  background: linear-gradient(135deg, #2f6fdf, #7a5af8);
  color: #fff; font-size: 12px; font-weight: 700; letter-spacing: 0;
}
.nav { display: flex; gap: 26px; }
.nav a { color: var(--ink-2); font-size: 14px; letter-spacing: -0.01em; opacity: 0.88; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); opacity: 1; text-decoration: none; }

main.wrap { min-height: 70vh; }

/* ---------- Home ---------- */
.hero { padding: 96px 0 56px; text-align: center; }
.hero h1 {
  margin: 0;
  font-size: clamp(44px, 7vw, 80px);
  line-height: 1.05;
  font-weight: 700;
  letter-spacing: -0.035em;
}
.lede {
  margin: 18px auto 0;
  max-width: 640px;
  color: var(--muted);
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.35;
  font-weight: 400;
  letter-spacing: -0.015em;
}

.posts { padding-bottom: 96px; }
.section-label {
  margin: 0 0 20px;
  font-size: 28px; font-weight: 700; letter-spacing: -0.025em;
}
.post-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 20px; }
.post-card {
  display: block;
  padding: 32px 36px;
  border-radius: var(--radius);
  background: var(--bg-alt);
  color: var(--ink);
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}
.post-card:hover {
  text-decoration: none;
  color: var(--ink);
  background: var(--card);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px) scale(1.005);
}
.post-card h3 {
  margin: 8px 0 10px;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.025em;
}
.post-card p { margin: 0; color: var(--ink-2); font-size: 17px; }
.read-more { display: inline-block; margin-top: 18px; color: var(--accent); font-size: 17px; }
.post-card:hover .read-more { text-decoration: underline; text-underline-offset: 3px; }
.post-meta { color: var(--muted); font-size: 14px; letter-spacing: -0.01em; }

/* ---------- Post ---------- */
.post { max-width: 760px; margin: 0 auto; padding: 56px 0 96px; }
.post-header { padding-bottom: 32px; margin-bottom: 40px; border-bottom: 1px solid var(--line-soft); }
.post-header h1 {
  margin: 18px 0 0;
  font-size: clamp(34px, 5.2vw, 52px);
  line-height: 1.08;
  font-weight: 700;
  letter-spacing: -0.03em;
}
.post-header .lede { margin: 16px 0 0; text-align: left; max-width: none; font-size: 21px; }
.post-header .post-meta { margin-top: 20px; }
.back { font-size: 14px; }
.post-footer { margin-top: 64px; padding-top: 24px; border-top: 1px solid var(--line-soft); }

.prose { font-size: 18px; line-height: 1.6; color: var(--ink); }
.prose > * + * { margin-top: 1.1em; }
.prose p, .prose ul, .prose ol { margin-bottom: 0; }
.prose h2 {
  margin: 2.4em 0 0.6em;
  font-size: 32px; line-height: 1.15; font-weight: 700; letter-spacing: -0.028em;
}
.prose h3 {
  margin: 2em 0 0.4em;
  font-size: 23px; line-height: 1.2; font-weight: 600; letter-spacing: -0.02em;
}
.prose h2 + *, .prose h3 + * { margin-top: 0; }
.prose strong { font-weight: 600; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li + li { margin-top: 0.45em; }
.prose li::marker { color: var(--muted); }
.prose hr { border: 0; height: 1px; background: var(--line-soft); margin: 3em 0; }
.prose blockquote {
  margin-left: 0; padding: 4px 0 4px 20px;
  border-left: 3px solid var(--accent); color: var(--ink-2);
}

/* Charts: full-bleed rounded "product shot" frames */
.prose p:has(> img:only-child) { margin: 2em 0; }
.prose img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* Tables: clean, scrollable on phones */
.prose table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  font-size: 15px;
  line-height: 1.4;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  margin: 1.8em 0;
}
.prose thead th {
  color: var(--muted);
  font-weight: 600;
  font-size: 13px;
  text-transform: none;
  border-bottom: 1px solid var(--line);
}
.prose th, .prose td { padding: 11px 14px; text-align: left; vertical-align: top; }
.prose td { border-bottom: 1px solid var(--line-soft); }
.prose tbody tr:hover td { background: var(--bg-alt); }
.prose th:first-child, .prose td:first-child { padding-left: 0; }

/* Code */
.prose code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--code-bg);
  padding: 0.15em 0.4em;
  border-radius: 6px;
  letter-spacing: 0;
}
.prose pre {
  font-family: var(--mono);
  background: var(--code-bg);
  padding: 20px 22px;
  border-radius: 14px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.6;
  letter-spacing: 0;
}
.prose pre code { background: none; padding: 0; font-size: inherit; }
.highlight .c, .highlight .c1, .highlight .cm { color: var(--muted); font-style: italic; }
.highlight .s, .highlight .s1, .highlight .s2 { color: #c41a16; }
.highlight .k, .highlight .kd, .highlight .nb { color: #9b2393; }
.highlight .m, .highlight .mi, .highlight .mf { color: #1c00cf; }
@media (prefers-color-scheme: dark) {
  .highlight .s, .highlight .s1, .highlight .s2 { color: #fc6a5d; }
  .highlight .k, .highlight .kd, .highlight .nb { color: #fc5fa3; }
  .highlight .m, .highlight .mi, .highlight .mf { color: #d0bf69; }
}

/* ---------- Footer ---------- */
.site-footer { background: var(--bg-alt); border-top: 1px solid var(--line-soft); }
.footer-row {
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  padding-top: 20px; padding-bottom: 28px;
  color: var(--muted); font-size: 12px; letter-spacing: -0.01em;
}
.footer-row a { color: var(--ink-2); }

/* ---------- Small screens ---------- */
@media (max-width: 640px) {
  body { font-size: 17px; }
  .wrap { padding: 0 16px; }
  .nav { gap: 18px; }
  .hero { padding: 64px 0 40px; }
  .post-card { padding: 24px 22px; }
  .post { padding-top: 36px; }
  .prose { font-size: 17px; }
  .prose h2 { font-size: 26px; }
  .prose h3 { font-size: 20px; }
}