:root {
  --bg: #f7f5f0;
  --surface: #fffefb;
  --ink: #1c1b19;
  --muted: #5d5a53;
  --line: #ddd8cc;
  --accent: #0f5c4d;
  --accent-ink: #ffffff;
  --accent-soft: #e2efe9;
  --warn: #9a3412;
  --serif: ui-serif, "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --gutter: 16px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14130f; --surface: #1c1b17; --ink: #efece4; --muted: #aaa597;
    --line: #34322b; --accent: #5fc4a9; --accent-ink: #0b1a15; --accent-soft: #1b2b26; --warn: #fb923c;
  }
}
:root[data-theme="dark"] {
  --bg: #14130f; --surface: #1c1b17; --ink: #efece4; --muted: #aaa597;
  --line: #34322b; --accent: #5fc4a9; --accent-ink: #0b1a15; --accent-soft: #1b2b26; --warn: #fb923c;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 17px/1.6 var(--sans);
}
.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 var(--gutter); }
@media (min-width: 720px) { :root { --gutter: 28px; } }

a { color: var(--accent); text-underline-offset: 3px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 3px; }
.skip { position: absolute; left: -999px; top: 0; background: var(--accent); color: var(--accent-ink); padding: 8px 14px; z-index: 10; }
.skip:focus { left: 8px; top: 8px; }

h1, h2, h3, h4 { font-family: var(--serif); line-height: 1.15; margin: 0; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.1rem, 6.2vw, 3.6rem); font-weight: 700; }
h2 { font-size: clamp(1.6rem, 4vw, 2.2rem); }
h3 { font-size: 1.2rem; }
p { margin: 0; }

header.top { padding: 18px 0; }
header.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.brand { font: 700 1.15rem var(--serif); color: var(--ink); text-decoration: none; display: inline-flex; align-items: center; gap: 8px; }
.brand svg { width: 24px; height: 24px; }
.nav a { color: var(--muted); font-size: 0.95rem; margin-left: 18px; text-decoration: none; }
.nav a:hover { color: var(--ink); }
.nav a.cta-link { color: var(--accent); font-weight: 600; }
@media (max-width: 520px) { .nav a:not(.cta-link) { display: none; } }

.hero { padding: 40px 0 56px; }
.hero .eyebrow { font: 600 0.8rem var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); margin-bottom: 16px; }
.hero h1 { max-width: 16ch; }
.hero .lede { margin-top: 20px; max-width: 58ch; font-size: 1.15rem; color: var(--muted); }
.hero .actions { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.btn {
  display: inline-block; background: var(--accent); color: var(--accent-ink);
  font: 600 1rem var(--sans); padding: 12px 22px; border-radius: 8px; border: 0;
  text-decoration: none; cursor: pointer; min-height: 44px;
}
.btn:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; color: var(--accent); border: 1.5px solid var(--accent); }
.btn[disabled] { opacity: 0.6; cursor: progress; }

section { padding: 48px 0; border-top: 1px solid var(--line); }
section > .wrap > h2 + p { margin-top: 12px; max-width: 60ch; color: var(--muted); }

.cards { display: grid; gap: 16px; margin-top: 28px; grid-template-columns: 1fr; }
@media (min-width: 760px) { .cards { grid-template-columns: repeat(3, 1fr); } }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 22px; }
.card h3 { margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 0.97rem; }

.steps { counter-reset: s; list-style: none; padding: 0; margin: 28px 0 0; display: grid; gap: 16px; grid-template-columns: 1fr; }
@media (min-width: 760px) { .steps { grid-template-columns: repeat(3, 1fr); } }
.steps li { counter-increment: s; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 22px; }
.steps li::before { content: counter(s); display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font: 700 0.95rem var(--mono); margin-bottom: 12px; }
.steps strong { display: block; font-family: var(--serif); font-size: 1.15rem; margin-bottom: 4px; }
.steps span { color: var(--muted); font-size: 0.97rem; }

/* Sample sheets */
.tabs { display: none; margin-top: 28px; gap: 8px; flex-wrap: wrap; }
.js .tabs { display: flex; }
.tab {
  font: 600 0.95rem var(--sans); color: var(--muted); background: transparent;
  border: 1.5px solid var(--line); border-radius: 999px; padding: 9px 18px; cursor: pointer; min-height: 44px;
}
.tab[aria-selected="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.sheets { margin-top: 20px; display: grid; gap: 28px; }
.js .sheet[hidden] { display: none; }

.sheet { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; box-shadow: 0 1px 0 var(--line), 0 14px 30px -22px rgba(0,0,0,.35); }
.sheet-head { padding: 22px 22px 18px; border-bottom: 1px solid var(--line); background: var(--accent-soft); }
.sheet-kind { font: 600 0.75rem var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); }
.sheet-head h3 { font-size: clamp(1.3rem, 3.6vw, 1.75rem); margin: 6px 0 12px; }
.meta { display: flex; flex-wrap: wrap; gap: 6px 22px; margin: 0; font-size: 0.88rem; color: var(--muted); }
.meta div { display: flex; gap: 6px; }
.meta dt { font-weight: 600; color: var(--ink); }
.meta dd { margin: 0; }
.sheet-body { padding: 8px 22px 22px; }
.field { padding: 16px 0; border-bottom: 1px dashed var(--line); }
.field:last-child { border-bottom: 0; }
.field h4 { font: 700 0.78rem var(--mono); letter-spacing: 0.07em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
.field p, .field li { font-size: 0.97rem; }
.field ul { margin: 0; padding-left: 1.2em; }
.field li { margin: 2px 0; }
.two { display: grid; gap: 0 28px; grid-template-columns: 1fr; }
@media (min-width: 760px) { .two { grid-template-columns: 1fr 1fr; } }
.table-wrap { overflow-x: auto; margin-top: 4px; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; min-width: 480px; }
caption { text-align: left; font-size: 0.85rem; color: var(--muted); padding-bottom: 6px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font: 700 0.75rem var(--mono); letter-spacing: 0.05em; text-transform: uppercase; color: var(--muted); }
td.id, td.num, code { font-family: var(--mono); font-size: 0.85em; }
td.num { text-align: right; white-space: nowrap; }
th.num { text-align: right; }
.note { margin-top: 14px; font-size: 0.85rem; color: var(--muted); }

/* Waitlist */
.waitlist-box { margin-top: 24px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 24px; max-width: 560px; }
form label { display: block; font-weight: 600; margin: 0 0 6px; font-size: 0.97rem; }
form .opt { font-weight: 400; color: var(--muted); }
form input[type="email"], form textarea {
  width: 100%; font: inherit; color: var(--ink); background: var(--bg);
  border: 1.5px solid var(--line); border-radius: 8px; padding: 11px 12px; min-height: 44px;
}
form textarea { min-height: 84px; resize: vertical; }
form .row { margin-bottom: 16px; }
form .fine { font-size: 0.85rem; color: var(--muted); margin-top: 12px; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.status { margin-top: 14px; font-weight: 600; min-height: 1.5em; }
.status.ok { color: var(--accent); }
.status.err { color: var(--warn); }

footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 0.9rem; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }

.prose { padding: 32px 0 56px; max-width: 70ch; }
.prose h1 { font-size: 2.2rem; margin-bottom: 20px; }
.prose h2 { font-size: 1.35rem; margin: 28px 0 8px; }
.prose p, .prose li { color: var(--ink); }
.prose ul { padding-left: 1.2em; }

.brand svg rect { fill: var(--accent); }
table.compact { min-width: 0; }
table.compact th { text-transform: none; letter-spacing: 0; font: 600 0.9rem var(--sans); color: var(--ink); width: 45%; }

/* Blog */
.prose .crumbs { font-size: 0.9rem; margin-bottom: 8px; }
.prose .byline { color: var(--muted); font-size: 0.9rem; margin-bottom: 16px; }
.prose .notice { background: var(--accent-soft); border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; font-size: 0.93rem; margin: 0 0 24px; }
.prose article p, .prose article li { margin: 0 0 12px; }
.prose .cta { margin-top: 32px; }
.post-list { list-style: none; padding: 0; margin: 28px 0 0; display: grid; gap: 16px; }
.post-list li { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; }
.post-list h2 { font-size: 1.2rem; margin: 0 0 6px; }
.post-list p { margin: 0; color: var(--muted); font-size: 0.97rem; }

/* Language switcher */
header.top .wrap { flex-wrap: wrap; row-gap: 6px; }
.lang { display: flex; gap: 2px; font: 600 0.8rem var(--mono); }
.lang a, .lang .current { padding: 4px 7px; border-radius: 6px; text-decoration: none; }
.lang a { color: var(--muted); }
.lang a:hover { color: var(--ink); background: var(--accent-soft); }
.lang .current { background: var(--accent-soft); color: var(--accent); }

/* 404 page: a spec sheet with an empty required field */
.nf-block { max-width: 640px; margin: 24px auto 40px; }
.nf-block[hidden] { display: none; }
.nf-sheet .sheet-head h1 { font-size: clamp(1.5rem, 5vw, 2rem); margin: 6px 0 12px; }
.nf-path { word-break: break-all; }
.nf-missing { color: var(--warn); font-style: italic; }
.nf-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }


/* Blog: your-own-numbers calculator */
.calc { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; margin: 16px 0 24px; display: grid; gap: 14px; max-width: 520px; }
.calc label { display: block; font-weight: 600; font-size: 0.95rem; margin-bottom: 4px; }
.calc input { width: 100%; font: inherit; color: var(--ink); background: var(--bg); border: 1.5px solid var(--line); border-radius: 8px; padding: 10px 12px; min-height: 44px; }
.calc .calc-out { margin: 0; font-weight: 600; color: var(--accent); min-height: 1.5em; }