/* Shared design system for HTS Calculator, NutrientGraph and Cosmetic Rules.
   System fonts, no external requests, no cookies. Each site appends its brand accent tokens
   (light and dark) after this file at build time; everything else is identical across brands. */
:root {
  --bg: #ffffff;
  --surface: #f5f7f9;
  --fg: #14171a;
  --muted: #4a5560;
  --border: #cfd6dd;
  --accent: #0b5cad;
  --accent-strong: #084786;
  --accent-fg: #ffffff;
  --code-bg: #eef1f4;
  --code-fg: #1b2530;
  --note-bg: #fff4d6;
  --note-fg: #4d3800;
  --note-border: #c99a00;
  --ok: #17663a;
  --bad: #a1161b;
  --focus: #b3006b;
  --radius: 8px;
  --max: 72rem;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1419;
    --surface: #161d24;
    --fg: #e8eaed;
    --muted: #a9b3bd;
    --border: #34404b;
    --accent: #7cb7ff;
    --accent-strong: #a8ceff;
    --accent-fg: #0b1420;
    --code-bg: #1b232c;
    --code-fg: #dfe6ee;
    --note-bg: #2f2709;
    --note-fg: #f5e3a6;
    --note-border: #8a6d12;
    --ok: #7fd6a2;
    --bad: #ff9a9e;
    --focus: #ff7cc6;
  }
}
:root[data-theme="dark"] {
  --bg: #0f1419; --surface: #161d24; --fg: #e8eaed; --muted: #a9b3bd; --border: #34404b;
  --accent: #7cb7ff; --accent-strong: #a8ceff; --accent-fg: #0b1420; --code-bg: #1b232c; --code-fg: #dfe6ee;
  --note-bg: #2f2709; --note-fg: #f5e3a6; --note-border: #8a6d12; --ok: #7fd6a2; --bad: #ff9a9e; --focus: #ff7cc6;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { color: var(--accent-strong); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
img, svg { max-width: 100%; height: auto; }
h1, h2, h3, h4 { line-height: 1.25; margin: 1.6em 0 0.5em; }
h1 { font-size: clamp(1.8rem, 4vw, 2.5rem); margin-top: 0.4em; letter-spacing: -0.01em; overflow-wrap: anywhere; }
h2 { font-size: 1.45rem; }
h3 { font-size: 1.15rem; }
h4 { font-size: 1rem; }
p, ul, ol, dl { margin: 0 0 1em; }
code, pre, kbd { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.9em; }
code { background: var(--code-bg); color: var(--code-fg); padding: 0.1em 0.35em; border-radius: 4px; overflow-wrap: anywhere; }
pre { background: var(--code-bg); color: var(--code-fg); padding: 1rem; border-radius: var(--radius); overflow-x: auto; line-height: 1.45; max-height: 32rem; border: 1px solid var(--border); }
pre code { background: none; padding: 0; overflow-wrap: normal; }

.skip { position: absolute; left: -9999px; top: 0; }
.skip:focus { left: 1rem; top: 1rem; z-index: 10; background: var(--bg); padding: 0.5rem 1rem; border: 2px solid var(--focus); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }

header.site { border-bottom: 1px solid var(--border); background: var(--bg); }
header.site .bar { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 1.5rem; padding-top: 0.75rem; padding-bottom: 0.75rem; }
.brand { display: inline-flex; align-items: center; gap: 0.45rem; font-weight: 700; font-size: 1.15rem; text-decoration: none; color: var(--fg); white-space: nowrap; }
.brand .mark { color: var(--accent); flex: none; }
.brand .tag { font-size: 0.72rem; }
nav.main { margin-left: auto; }
nav.main ul { list-style: none; display: flex; flex-wrap: wrap; gap: 0.25rem 1.1rem; margin: 0; padding: 0; }
nav.main a { text-decoration: none; color: var(--fg); padding: 0.25rem 0; display: inline-block; }
nav.main a:hover, nav.main a[aria-current="page"] { color: var(--accent); text-decoration: underline; }
@media (max-width: 40rem) { nav.main { margin-left: 0; width: 100%; } }

.banner { background: var(--note-bg); color: var(--note-fg); border-bottom: 1px solid var(--note-border); font-size: 0.92rem; }
.banner .wrap { padding-top: 0.45rem; padding-bottom: 0.45rem; }
.note { background: var(--note-bg); color: var(--note-fg); border: 1px solid var(--note-border); border-radius: var(--radius); padding: 0.75rem 1rem; margin: 1rem 0; }
.note a { color: inherit; }
.note > :last-child { margin-bottom: 0; }

.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 0.25rem; padding: 0; margin: 1rem 0 0; font-size: 0.9rem; color: var(--muted); }
.crumbs li + li::before { content: "/"; margin: 0 0.4rem 0 0.15rem; color: var(--muted); }

main { padding-bottom: 3rem; }
.hero { padding: 2.25rem 0 1rem; }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 46rem; }
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 1.25rem 0; align-items: center; }
.actions.tight { margin: 0.25rem 0; }
.btn { display: inline-block; padding: 0.6rem 1.1rem; border-radius: var(--radius); background: var(--accent); color: var(--accent-fg); text-decoration: none; font-weight: 600; border: 2px solid var(--accent); cursor: pointer; font-size: 1rem; font-family: inherit; }
.btn:hover { background: var(--accent-strong); border-color: var(--accent-strong); color: var(--accent-fg); }
.btn.secondary { background: transparent; color: var(--accent); }
.btn.secondary:hover { background: var(--surface); color: var(--accent-strong); }
.btn[disabled] { opacity: 0.6; cursor: not-allowed; }
.small-btn { padding: 0.3rem 0.7rem; font-size: 0.9rem; }

.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); }
.card { border: 1px solid var(--border); border-radius: var(--radius); padding: 1.1rem 1.2rem; background: var(--surface); }
.card h2, .card h3 { margin-top: 0; }
.card > :last-child { margin-bottom: 0; }
.stat { font-size: 1.6rem; font-weight: 700; display: block; line-height: 1.2; font-variant-numeric: tabular-nums; }
.stat-label { color: var(--muted); font-size: 0.92rem; }
.stats { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr)); margin: 1rem 0; padding: 0; list-style: none; }
.stats li { border-left: 3px solid var(--accent); padding-left: 0.75rem; }
.muted { color: var(--muted); }
.small { font-size: 0.9rem; }
.tag { display: inline-block; font-size: 0.8rem; font-weight: 600; padding: 0.05rem 0.5rem; border-radius: 999px; border: 1px solid var(--border); background: var(--bg); color: var(--muted); vertical-align: middle; }
.method { font-family: ui-monospace, Menlo, monospace; font-weight: 700; font-size: 0.85rem; padding: 0.1rem 0.45rem; border-radius: 4px; border: 1px solid var(--border); background: var(--bg); margin-right: 0.4rem; }
.cols { columns: 2 18rem; column-gap: 2rem; }
.cols li { break-inside: avoid; }
ul.plain { list-style: none; padding: 0; }
dl.facts { display: grid; grid-template-columns: minmax(8rem, max-content) 1fr; gap: 0.35rem 1rem; }
dl.facts dt { font-weight: 600; }
dl.facts dd { margin: 0; overflow-wrap: anywhere; }
@media (max-width: 30rem) { dl.facts { grid-template-columns: 1fr; } dl.facts dd { margin-bottom: 0.5rem; } }

.table-wrap { overflow-x: auto; margin: 0.5rem 0 1.25rem; border: 1px solid var(--border); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: 0.95rem; }
caption { text-align: left; font-weight: 600; padding: 0.6rem 0.75rem; }
th, td { text-align: left; padding: 0.45rem 0.75rem; border-top: 1px solid var(--border); vertical-align: top; }
thead th { background: var(--surface); border-top: none; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
table.dense { font-size: 0.88rem; }
table.dense th, table.dense td { padding: 0.35rem 0.55rem; }
td.desc { min-width: 14rem; }
td.code, th.code { white-space: nowrap; font-family: ui-monospace, Menlo, monospace; font-size: 0.9em; }
.indent-1 { padding-left: 1.4rem; } .indent-2 { padding-left: 2.4rem; } .indent-3 { padding-left: 3.4rem; } .indent-4 { padding-left: 4.4rem; } .indent-5 { padding-left: 5.4rem; }

ol.steps { counter-reset: s; list-style: none; padding: 0; }
ol.steps li { counter-increment: s; position: relative; padding-left: 2.5rem; margin-bottom: 0.9rem; }
ol.steps li::before { content: counter(s); position: absolute; left: 0; top: 0; width: 1.8rem; height: 1.8rem; border-radius: 50%; background: var(--accent); color: var(--accent-fg); display: grid; place-items: center; font-weight: 700; font-size: 0.9rem; }

details { border: 1px solid var(--border); border-radius: var(--radius); padding: 0.5rem 1rem; margin: 0.75rem 0; background: var(--bg); }
details > summary { cursor: pointer; font-weight: 600; padding: 0.25rem 0; }
details[open] > summary { margin-bottom: 0.5rem; }

.plans { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); margin: 1.5rem 0; }
.plan { border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; display: flex; flex-direction: column; background: var(--surface); }
.plan.featured { border: 2px solid var(--accent); }
.plan h2 { margin: 0 0 0.25rem; font-size: 1.3rem; }
.price { font-size: 2rem; font-weight: 700; margin: 0.25rem 0; }
.price small { font-size: 0.95rem; color: var(--muted); font-weight: 400; }
.plan ul { padding-left: 1.1rem; flex: 1; }

form.stack, .stack { display: grid; gap: 0.9rem; max-width: 34rem; }
label, .label { font-weight: 600; display: block; margin-bottom: 0.25rem; }
input[type="email"], input[type="text"], input[type="password"], input[type="search"], input[type="number"], input[type="date"], select, textarea {
  width: 100%; padding: 0.5rem 0.65rem; font-size: 1rem; font-family: inherit; border: 1px solid var(--muted); border-radius: 6px; background: var(--bg); color: var(--fg);
}
textarea { min-height: 7rem; font-family: ui-monospace, Menlo, monospace; font-size: 0.9rem; }
fieldset { border: 1px solid var(--border); border-radius: var(--radius); padding: 0.75rem 1rem; margin: 0; }
legend { font-weight: 600; padding: 0 0.25rem; }
.check { display: flex; gap: 0.5rem; align-items: flex-start; }
.check label { font-weight: 400; margin: 0; }
.check input { margin-top: 0.35rem; width: 1.1rem; height: 1.1rem; flex: none; }
.checks { display: flex; flex-wrap: wrap; gap: 0.25rem 1.25rem; }
.hint { color: var(--muted); font-size: 0.9rem; margin-top: 0.25rem; }
.status { min-height: 1.5rem; }
.status.ok { color: var(--ok); }
.status.bad { color: var(--bad); }
.keybox { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.keybox input { flex: 1 1 18rem; font-family: ui-monospace, Menlo, monospace; }
.mono { font-family: ui-monospace, Menlo, monospace; }
.turnstile { min-height: 1rem; }
progress { width: 100%; max-width: 20rem; height: 0.9rem; accent-color: var(--accent); vertical-align: middle; }
.form-grid { display: grid; gap: 0.75rem 1rem; grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr)); align-items: end; }

footer.site { border-top: 1px solid var(--border); color: var(--muted); font-size: 0.9rem; }
footer.site .wrap { padding-top: 1.5rem; padding-bottom: 2rem; display: flex; flex-wrap: wrap; gap: 0.5rem 2rem; justify-content: space-between; }
footer.site .wrap > div { max-width: 40rem; }
footer.site ul { list-style: none; display: flex; flex-wrap: wrap; gap: 0.25rem 1rem; padding: 0; margin: 0; align-content: flex-start; }
footer.site a { color: var(--muted); }

.op { border-top: 1px solid var(--border); padding-top: 0.5rem; margin-top: 2rem; }
.op h3 { margin-top: 0.75rem; }
.toc { columns: 2 16rem; padding-left: 1.1rem; }
.lang-list { display: flex; flex-wrap: wrap; gap: 0.5rem 1rem; list-style: none; padding: 0; }
.filter { max-width: 28rem; margin: 1rem 0; }

@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }
@media print { header.site nav, .banner, footer.site, .actions { display: none; } }
.plan .soon { margin: 0.75rem 0 0; }

/* ---- brand: NutrientGraph (from config/brands.json) ---- */
:root { --accent: #a3361a; --accent-strong: #7f2912; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --accent: #ff9f80; --accent-strong: #ffc2ad; } }
:root[data-theme="dark"] { --accent: #ff9f80; --accent-strong: #ffc2ad; }