/* ElectroCratx — Design System
   Concept: the visual language of an electrical schematic sheet.
   Paper-blue grid ground, ink-navy type, copper-wire accent for links/CTAs,
   terminal-green accent reserved for "measured value" data only.
*/

:root {
  --paper: #EDF1F3;
  --paper-raised: #FFFFFF;
  --ink: #16212B;
  --ink-soft: #45566329;
  --ink-muted: #526270;
  --grid-line: #C4D2DA;
  --copper: #B0602E;
  --copper-dark: #8A4A22;
  --copper-tint: #F1DDCB;
  --volt-green: #1F6E4A;
  --volt-green-tint: #DCEEE3;
  --danger: #A83A32;
  --radius: 2px;
  --serif: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --sans: "IBM Plex Sans", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", "SF Mono", Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 28px 28px;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--copper-dark); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--copper); }

img, svg { max-width: 100%; }

.wrap {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header / Nav ---------- */

.site-header {
  border-bottom: 2px solid var(--ink);
  background: var(--paper-raised);
  position: sticky;
  top: 0;
  z-index: 50;
}

.site-header .wrap {
  max-width: 1080px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
}

.logo {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
  color: var(--ink);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo .mark { color: var(--copper); }

.site-nav { display: flex; gap: 26px; font-family: var(--sans); font-size: 0.92rem; }
.site-nav a { color: var(--ink); text-decoration: none; font-weight: 500; }
.site-nav a:hover { color: var(--copper-dark); }

/* ---------- Hero ---------- */

.hero {
  max-width: 1080px;
  margin: 0 auto;
  padding: 64px 24px 40px;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--copper-dark);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--copper-dark);
  display: inline-block;
}

h1 {
  font-family: var(--sans);
  font-weight: 700;
  font-size: clamp(2rem, 4.4vw, 3.1rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 20px;
  max-width: 16ch;
}

.hero-tagline {
  font-size: 1.2rem;
  color: var(--ink-muted);
  max-width: 60ch;
  margin: 0 0 8px;
}

/* ---------- Feature cards / circuit grid ---------- */

.circuit-grid {
  max-width: 1080px;
  margin: 40px auto 0;
  padding: 0 24px 20px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--ink);
}

.circuit-card {
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  padding: 26px 22px 24px;
  background: var(--paper-raised);
  text-decoration: none;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background 0.15s ease;
}
.circuit-card:hover { background: var(--copper-tint); }

.circuit-card .node {
  width: 34px; height: 34px;
  border: 1.5px solid var(--copper-dark);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); color: var(--copper-dark); font-size: 0.9rem;
}

.circuit-card h3 {
  font-family: var(--sans);
  font-size: 1.02rem;
  margin: 6px 0 0;
}

.circuit-card p {
  font-size: 0.92rem;
  color: var(--ink-muted);
  margin: 0;
  line-height: 1.5;
}

@media (max-width: 820px) {
  .circuit-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .circuit-grid { grid-template-columns: 1fr; }
}

/* ---------- Prose sections ---------- */

main.article, .prose-section {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-block {
  padding: 44px 0;
  border-bottom: 1px solid var(--grid-line);
}
.section-block:last-of-type { border-bottom: none; }

h2 {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 1.6rem;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  scroll-margin-top: 90px;
}

h3 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.18rem;
  margin: 30px 0 12px;
  color: var(--ink);
  scroll-margin-top: 90px;
}

h3.product-name {
  border-left: 4px solid var(--copper);
  padding-left: 12px;
}

p { margin: 0 0 18px; }
ul, ol { padding-left: 22px; margin: 0 0 18px; }
li { margin-bottom: 8px; }

.lede {
  font-size: 1.18rem;
  color: var(--ink);
}
.lede::first-letter {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 3.1rem;
  float: left;
  line-height: 0.85;
  padding: 4px 8px 0 0;
  color: var(--copper-dark);
}

/* ---------- Data tables ---------- */

.data-table-wrap { overflow-x: auto; margin: 22px 0 28px; border: 1px solid var(--ink); }

table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 0.9rem;
  background: var(--paper-raised);
}

thead th {
  background: var(--ink);
  color: var(--paper);
  text-align: left;
  padding: 10px 14px;
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

tbody td {
  padding: 10px 14px;
  border-top: 1px solid var(--grid-line);
  vertical-align: top;
}

tbody tr:nth-child(even) { background: #F5F7F8; }

td.num, th.num { font-family: var(--mono); }

.table-caption {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-muted);
  padding: 8px 14px;
  border-top: 1px solid var(--grid-line);
  background: var(--paper);
}

/* ---------- Callouts ---------- */

.spec-callout {
  border: 1px solid var(--ink);
  border-left: 4px solid var(--volt-green);
  background: var(--volt-green-tint);
  padding: 16px 20px;
  font-size: 0.94rem;
  margin: 22px 0;
}
.spec-callout strong { color: var(--volt-green); font-family: var(--mono); }

.source-note {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-muted);
  border-top: 1px dashed var(--grid-line);
  padding-top: 10px;
  margin-top: -6px;
}

.pull-quote {
  font-family: var(--sans);
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--ink);
  border-left: 3px solid var(--copper);
  padding-left: 18px;
  margin: 28px 0;
}

/* ---------- TOC ---------- */

.toc {
  border: 1px solid var(--ink);
  background: var(--paper-raised);
  padding: 20px 24px;
  margin: 8px 0 8px;
}
.toc-title {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--copper-dark);
  margin: 0 0 10px;
}
.toc ol { columns: 2; column-gap: 32px; padding-left: 18px; margin: 0; }
.toc a { text-decoration: none; font-family: var(--sans); font-size: 0.94rem; }
.toc a:hover { text-decoration: underline; }

@media (max-width: 600px) {
  .toc ol { columns: 1; }
}

/* ---------- Comparison scenario cards ---------- */

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px;
  margin: 24px 0;
}
.scenario-card {
  border: 1px solid var(--ink);
  background: var(--paper-raised);
  padding: 16px 18px;
}
.scenario-card .label {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--copper-dark);
  display: block;
  margin-bottom: 6px;
}
.scenario-card strong { font-family: var(--sans); display: block; margin-bottom: 4px; }

/* ---------- FAQ ---------- */

.faq-item { border-top: 1px solid var(--grid-line); padding: 18px 0; }
.faq-item:last-child { border-bottom: 1px solid var(--grid-line); }
.faq-q {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.02rem;
  margin: 0 0 8px;
  display: flex;
  gap: 10px;
}
.faq-q::before { content: "Q"; color: var(--copper); font-family: var(--mono); }
.faq-a { margin: 0; padding-left: 22px; color: var(--ink-muted); }

/* ---------- Author box ---------- */

.author-box {
  max-width: 760px;
  margin: 10px auto 60px;
  padding: 24px 24px 24px 24px;
  border: 1px solid var(--ink);
  background: var(--paper-raised);
  display: flex;
  gap: 18px;
  align-items: flex-start;
}
.author-avatar {
  width: 52px; height: 52px;
  border: 1.5px solid var(--copper-dark);
  border-radius: 50%;
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono);
  color: var(--copper-dark);
  font-size: 1rem;
  background: var(--copper-tint);
}
.author-box .name { font-family: var(--sans); font-weight: 700; margin: 0 0 4px; }
.author-box .role { font-family: var(--mono); font-size: 0.78rem; color: var(--copper-dark); margin: 0 0 10px; }
.author-box p.bio { font-size: 0.92rem; color: var(--ink-muted); margin: 0; }

/* ---------- Related / internal links ---------- */

.related-box {
  border: 1px dashed var(--ink);
  padding: 18px 22px;
  margin: 30px 0;
  font-size: 0.94rem;
  background: var(--paper);
}
.related-box .label {
  font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--copper-dark); display: block; margin-bottom: 8px;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 2px solid var(--ink);
  margin-top: 60px;
  background: var(--paper-raised);
}
.site-footer .wrap {
  max-width: 1080px;
  padding: 32px 24px 40px;
  font-family: var(--sans);
  font-size: 0.86rem;
  color: var(--ink-muted);
}
.site-footer .foot-links { margin-bottom: 10px; }
.site-footer a { color: var(--ink-muted); margin-right: 18px; }
.site-footer .disclosure { font-family: var(--mono); font-size: 0.78rem; color: var(--volt-green); margin-top: 10px; }

/* ---------- Misc ---------- */

.section-label {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.divider-bolt {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 8px 0 30px;
  color: var(--grid-line);
}
.divider-bolt::before, .divider-bolt::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--grid-line);
}