/* Static guide pages. Same palette as the React homepage (W_TOKENS), but
   plain HTML + CSS so crawlers and AI answer engines read the full text
   without running JavaScript. */
:root {
  --bg: #0A0C0D; --bg-section: #0F1213; --bg-card: #14171A;
  --fg: #FFFFFF; --muted: #A4ABAE; --faint: #6E7679;
  --mint: #08D8AB; --mint-soft: rgba(8,216,171,0.10); --mint-bd: rgba(8,216,171,0.30);
  --warn: #F2A356; --warn-soft: rgba(242,163,86,0.10); --warn-bd: rgba(242,163,86,0.32);
  --border: rgba(255,255,255,0.08); --border-strong: rgba(255,255,255,0.16);
  --serif: Fraunces, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", Inter, system-ui, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--fg); font-family: var(--sans); -webkit-text-size-adjust: 100%; }
a { color: var(--mint); }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible { outline: 2px solid var(--mint); outline-offset: 3px; }

.nav { position: sticky; top: 0; z-index: 10; background: rgba(10,12,13,0.86); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.nav-in { max-width: 1040px; margin: 0 auto; padding: 12px 20px; display: flex; align-items: center; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--fg); text-decoration: none; font-weight: 700; }
.brand img { width: 28px; height: 28px; border-radius: 7px; }
.nav-links { display: flex; gap: 18px; margin-left: auto; font-size: 14px; }
.nav-links a { color: var(--muted); text-decoration: none; }
.nav-links a:hover { color: var(--fg); }
.get { background: var(--fg); color: #0A0C0D !important; padding: 8px 14px; border-radius: 10px; font-weight: 700; font-size: 13px; text-decoration: none; white-space: nowrap; }
@media (max-width: 640px) { .nav-links .hide-sm { display: none; } }

.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
.hero { padding: 56px 0 8px; }
.eyebrow { color: var(--mint); font-size: 12px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; }
h1 { font-family: var(--serif); font-weight: 600; font-size: clamp(34px, 6vw, 52px); line-height: 1.05; letter-spacing: -0.02em; margin: 12px 0 14px; }
.lede { color: var(--muted); font-size: 18px; line-height: 1.55; margin: 0; }
.meta { color: var(--faint); font-size: 13px; margin-top: 14px; }

.prose { font-size: 17px; line-height: 1.7; color: #E6E8E9; padding: 8px 0 24px; }
.prose h2 { font-family: var(--serif); font-weight: 600; font-size: 28px; line-height: 1.2; color: var(--fg); margin: 44px 0 12px; }
.prose h3 { font-size: 19px; color: var(--fg); margin: 28px 0 8px; }
.prose p, .prose li { color: #D5D9DA; }
.prose ul, .prose ol { padding-left: 22px; }
.prose li { margin: 6px 0; }
.prose code, .formula { font-family: ui-monospace, "SF Mono", Menlo, monospace; background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px; padding: 1px 6px; font-size: 0.92em; }
.formula { display: block; padding: 12px 14px; margin: 12px 0; overflow-x: auto; white-space: nowrap; }

.table-wrap { overflow-x: auto; margin: 16px 0; border: 1px solid var(--border); border-radius: 12px; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { color: var(--muted); font-weight: 600; background: var(--bg-section); }
tr:last-child td { border-bottom: none; }

.note { background: var(--warn-soft); border: 1px solid var(--warn-bd); border-radius: 12px; padding: 14px 16px; color: #F4D9BC; font-size: 14px; line-height: 1.55; margin: 20px 0; }
.card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px; padding: 20px; }

details { border-bottom: 1px solid var(--border); padding: 14px 0; }
details summary { cursor: pointer; font-weight: 600; color: var(--fg); list-style: none; }
details summary::-webkit-details-marker { display: none; }
details summary::after { content: "+"; float: right; color: var(--mint); }
details[open] summary::after { content: "–"; }
details p { margin: 10px 0 0; }

.cta { margin: 36px 0; padding: 24px; border-radius: 18px; background: linear-gradient(135deg, rgba(8,216,171,0.14), rgba(138,111,240,0.10)); border: 1px solid var(--mint-bd); }
.cta h2 { margin: 0 0 8px !important; font-size: 24px !important; }
.cta p { margin: 0 0 16px; color: var(--muted); }
.btn { display: inline-block; background: var(--mint); color: #0A0C0D; font-weight: 700; text-decoration: none; padding: 12px 20px; border-radius: 12px; }

.related { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; margin: 16px 0 40px; }
.related a { display: block; text-decoration: none; color: var(--fg); background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 14px; font-weight: 600; font-size: 15px; }
.related a span { display: block; color: var(--muted); font-weight: 400; font-size: 13px; margin-top: 4px; }

.foot { border-top: 1px solid var(--border); margin-top: 40px; padding: 28px 0 48px; color: var(--faint); font-size: 13px; line-height: 1.6; }
.foot a { color: var(--muted); margin-right: 14px; }

/* Calculator */
.calc { display: grid; gap: 14px; }
.calc label { display: grid; gap: 6px; font-size: 14px; color: var(--muted); font-weight: 600; }
.calc .row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 520px) { .calc .row { grid-template-columns: 1fr; } }
.calc input, .calc select { width: 100%; background: var(--bg); color: var(--fg); border: 1px solid var(--border-strong); border-radius: 10px; padding: 12px; font-size: 17px; font-family: var(--sans); }
.calc .unit { display: grid; grid-template-columns: 1fr auto; gap: 8px; }
.calc .unit select { width: auto; }
.result { margin-top: 6px; border-radius: 14px; background: var(--mint-soft); border: 1px solid var(--mint-bd); padding: 18px; }
.result .big { font-family: var(--serif); font-size: 44px; font-weight: 600; line-height: 1; color: var(--fg); }
.result .big small { font-family: var(--sans); font-size: 16px; color: var(--muted); font-weight: 500; }
.result dl { display: grid; grid-template-columns: auto 1fr; gap: 6px 16px; margin: 14px 0 0; font-size: 15px; }
.result dt { color: var(--muted); }
.result dd { margin: 0; color: var(--fg); font-weight: 600; }
.warn-line { color: var(--warn); font-size: 14px; margin-top: 10px; }
.syringe { margin-top: 14px; height: 18px; border-radius: 9px; background: var(--bg); border: 1px solid var(--border-strong); overflow: hidden; }
.syringe i { display: block; height: 100%; width: 0; background: var(--mint); transition: width .25s ease; }