:root {
  --ink: #1d1d1f;
  --ink-soft: #6e6e73;
  --line: #d2d2d7;
  --bg: #ffffff;
  --bg-soft: #f5f5f7;
  --accent: #0066cc;
  --ok: #1d7a3e;
  --code-bg: #f5f5f7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f5f5f7;
    --ink-soft: #a1a1a6;
    --line: #3a3a3c;
    --bg: #000000;
    --bg-soft: #1d1d1f;
    --accent: #2997ff;
    --ok: #48d597;
    --code-bg: #1d1d1f;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  padding: 0 24px 96px;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text",
        "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", sans-serif;
  max-width: 860px;
  margin-inline: auto;
}

header {
  padding: 80px 0 40px;
  text-align: center;
}

h1 {
  font-size: clamp(40px, 7vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 12px;
  font-weight: 700;
}

.sub {
  color: var(--ink-soft);
  font-size: 19px;
  margin: 0;
}

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.12em 0.4em;
  border-radius: 4px;
}

.cta {
  display: inline-block;
  margin-top: 18px;
  padding: 11px 22px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-size: 15px;
  font-weight: 550;
  transition: opacity 0.15s, transform 0.15s;
}

.cta:hover { opacity: 0.88; transform: translateY(-1px); }

.hero { margin: 8px 0 72px; }

.hero figcaption {
  font-size: 14px;
  color: var(--ink-soft);
  margin-top: 12px;
  text-align: center;
}

.hero img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 18px;
  border: 1px solid var(--line);
}

section { margin: 0 0 72px; }

h2 {
  font-size: 30px;
  letter-spacing: -0.02em;
  font-weight: 650;
  margin: 0 0 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

h3 {
  font-size: 17px;
  font-weight: 650;
  margin: 0 0 6px;
}

.lede {
  font-size: 19px;
  color: var(--ink-soft);
  margin: 0 0 24px;
}

.note {
  font-size: 15px;
  color: var(--ink-soft);
  margin: 14px 0 0;
}

.dim { color: var(--ink-soft); }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 16px;
}

th, td {
  text-align: left;
  padding: 12px 10px;
  border-bottom: 1px solid var(--line);
}

th {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  font-weight: 600;
}

td:not(:first-child), th:not(:first-child) { text-align: right; }

td.ok {
  color: var(--ok);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

td { font-variant-numeric: tabular-nums; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 18px;
}

figure { margin: 0; }

figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  border: 1px solid var(--line);
  transition: transform 0.18s ease, border-color 0.18s ease;
}

figure a { display: block; }

figure a:hover img {
  transform: translateY(-2px);
  border-color: var(--accent);
}

figcaption {
  font-size: 14px;
  color: var(--ink-soft);
  margin-top: 8px;
  text-align: center;
}

.cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 26px 32px;
}

.cols p {
  font-size: 15px;
  color: var(--ink-soft);
  margin: 0;
}

pre {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  font-size: 14px;
  line-height: 1.6;
}

pre code { background: none; padding: 0; font-size: inherit; }

ol.gotchas { padding-left: 22px; }
ol.gotchas li { margin-bottom: 14px; }
ol.gotchas strong { font-weight: 650; }

ul { padding-left: 22px; }
li { margin-bottom: 8px; }

a { color: var(--accent); }

footer {
  border-top: 1px solid var(--line);
  padding-top: 24px;
  color: var(--ink-soft);
  font-size: 14px;
}

footer p { margin: 0; }