/* graingraph.com: plain CSS, no build step, no external requests. */
:root {
  color-scheme: light dark;
  --bg: #faf8f3;
  --surface: #ffffff;
  --code-bg: #f2eee3;
  --text: #1d1b16;
  --muted: #5b564b;
  --border: #e3ddcd;
  --accent: #b45309;
  --accent-text: #ffffff;
  --accent-soft: #fbeedd;
  --teal: #0f766e;
  --teal-soft: #dff3ef;
  --shadow: 0 1px 2px rgba(29, 27, 22, .06), 0 8px 24px rgba(29, 27, 22, .06);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14130f;
    --surface: #1c1a15;
    --code-bg: #1f1d17;
    --text: #efeadc;
    --muted: #aaa28f;
    --border: #302c23;
    --accent: #f0b04a;
    --accent-text: #1a1408;
    --accent-soft: #2b2314;
    --teal: #5eead4;
    --teal-soft: #12302c;
    --shadow: none;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 1rem/1.6 var(--font);
  text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; }
a { color: var(--accent); text-underline-offset: .18em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
code, pre { font-family: var(--mono); font-variant-ligatures: none; }
code { font-size: .92em; }
:not(pre) > code { background: var(--code-bg); padding: .1em .35em; border-radius: 5px; }

.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--accent); color: var(--accent-text); padding: 8px 14px; border-radius: 6px; z-index: 10; }
.skip:focus { left: 8px; }

/* header */
.site-header { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); }
.bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 60px; flex-wrap: wrap; padding-block: 8px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 1.15rem; letter-spacing: -.01em; }
.brand svg { width: 30px; height: 30px; }
.brand .n { fill: var(--accent); }
.brand .e { stroke: var(--accent); }
nav ul { display: flex; flex-wrap: wrap; gap: 4px 18px; list-style: none; margin: 0; padding: 0; align-items: center; }
nav a { color: var(--muted); text-decoration: none; font-size: .95rem; padding: 6px 2px; }
nav a:hover { color: var(--text); }

/* buttons */
.btn { display: inline-block; padding: 11px 20px; border-radius: 10px; font-weight: 600; text-decoration: none; border: 1px solid transparent; font-size: 1rem; }
.btn.primary { background: var(--accent); color: var(--accent-text); }
.btn.primary:hover { filter: brightness(1.07); }
.btn.secondary { border-color: var(--border); color: var(--text); background: var(--surface); }
.btn.secondary:hover { border-color: var(--accent); }
.btn.small { padding: 6px 14px; font-size: .9rem; }

/* hero */
.hero { padding: clamp(48px, 9vw, 104px) 0 clamp(36px, 6vw, 64px); }
.eyebrow { color: var(--accent); font-weight: 700; letter-spacing: .08em; text-transform: uppercase; font-size: .8rem; margin: 0 0 14px; }
h1 { font-size: clamp(2rem, 5.2vw, 3.6rem); line-height: 1.08; letter-spacing: -.025em; margin: 0 0 20px; max-width: 18em; text-wrap: balance; }
.lede { font-size: clamp(1.05rem, 1.6vw, 1.25rem); color: var(--muted); max-width: 44em; margin: 0 0 28px; }
.lede code { color: var(--text); }
.cta { display: flex; flex-wrap: wrap; gap: 12px; }

/* sections */
section { padding: clamp(36px, 6vw, 64px) 0; }
section + section { border-top: 1px solid var(--border); }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); line-height: 1.15; letter-spacing: -.02em; margin: 0 0 12px; }
h3 { font-size: 1.1rem; margin: 0 0 8px; }
.sub { color: var(--muted); max-width: 46em; margin: 0 0 28px; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 440px), 1fr)); gap: 18px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 22px; box-shadow: var(--shadow); }
.card p { margin: 0; color: var(--muted); }
.card .tag { display: inline-block; font-size: .75rem; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; color: var(--accent); margin-bottom: 8px; }

/* code */
.code { position: relative; margin: 0; }
pre { margin: 0; padding: 16px 18px; background: var(--code-bg); border: 1px solid var(--border); border-radius: 12px; overflow-x: auto; font-size: .86rem; line-height: 1.55; tab-size: 2; }
.code.has-copy pre { padding-top: 40px; }
.code .copy { position: absolute; top: 8px; right: 8px; font: inherit; font-size: .78rem; padding: 3px 10px; border-radius: 6px; border: 1px solid var(--border); background: var(--surface); color: var(--muted); cursor: pointer; }
.code .copy:hover { color: var(--text); border-color: var(--accent); }
.stack { display: grid; grid-template-columns: minmax(0, 1fr); gap: 28px; }
.stack > *, .two > * { min-width: 0; }
.wrapcode pre { white-space: pre-wrap; overflow-wrap: anywhere; }
.two { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 440px), 1fr)); gap: 20px; align-items: start; }
.label { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin: 0 0 8px; font-weight: 600; }
.pill { font-size: .78rem; font-weight: 700; padding: 3px 10px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); white-space: nowrap; }
.pill.teal { background: var(--teal-soft); color: var(--teal); }
.note { color: var(--muted); font-size: .95rem; max-width: 52em; margin: 20px 0 0; }

.steps { counter-reset: s; list-style: none; padding: 0; margin: 0 0 24px; display: grid; gap: 14px; }
.steps li { counter-increment: s; position: relative; padding-left: 44px; }
.steps li::before { content: counter(s); position: absolute; left: 0; top: 0; width: 30px; height: 30px; display: grid; place-items: center; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font-weight: 700; }

/* footer */
footer { border-top: 1px solid var(--border); padding: 32px 0 48px; color: var(--muted); font-size: .92rem; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 28px; justify-content: space-between; }
footer ul { display: flex; flex-wrap: wrap; gap: 8px 18px; list-style: none; padding: 0; margin: 0; }
footer a { color: var(--muted); }
footer a:hover { color: var(--text); }
footer p { margin: 0; }
footer .legal { flex-basis: 100%; margin: 4px 0 0; font-size: .85rem; max-width: 60em; }

@media (max-width: 560px) {
  .wrap { padding: 0 16px; }
  nav li:has(> .btn) { display: none; } /* the hero and footer link to GitHub */
  .bar { justify-content: center; }
  .btn { width: 100%; text-align: center; }
  .btn.small { width: auto; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }