/* ============================================================
   Industrial Fieldbook — evidence-backed industrial intelligence
   Static CSS. No frameworks, no external fonts, no JS dependencies.
   Palette: paper, charcoal ink, muted field grey, burnt-copper accent.
   ============================================================ */

:root {
  --paper: #f4f3ef;
  --surface: #ffffff;
  --ink: #1b1a17;
  --muted: #6f6d64;
  --faint: #9b988d;
  --line: #e1dfd7;
  --line-strong: #c9c6ba;
  --accent: #a1540f;      /* burnt copper */
  --accent-ink: #ffffff;
  --well: #ecebe4;        /* subtle field background for tables/notes */

  --serif: Georgia, "Times New Roman", "Iowan Old Style", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */
.site-header {
  background: var(--ink);
  color: #f2f1ec;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 18px;
  padding-bottom: 18px;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}
.mark {
  width: 34px; height: 34px;
  border: 1px solid #6f6a5a;
  display: grid;
  place-items: center;
  color: var(--accent);
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
}
.brand .name {
  font-family: var(--serif);
  font-size: 19px;
  letter-spacing: 0.01em;
  font-weight: 700;
}
.brand .name small {
  display: block;
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #b5b1a3;
  margin-top: 1px;
}
.site-nav ul {
  list-style: none;
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}
.site-nav a {
  display: block;
  padding: 7px 11px;
  color: #e5e3da;
  text-decoration: none;
  font-size: 14px;
  border: 1px solid transparent;
}
.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: #fff;
  border-color: #55503f;
}

/* ---------- Hero ---------- */
.hero {
  padding: 88px 0 64px;
  border-bottom: 1px solid var(--line);
}
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 18px;
}
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(30px, 4.4vw, 46px);
  line-height: 1.15;
  margin: 0 0 20px;
  max-width: 18ch;
}
.lede {
  font-size: 19px;
  color: #3d3b35;
  max-width: 60ch;
  margin: 0 0 30px;
}
.hero .sub {
  color: var(--muted);
  font-size: 16px;
  max-width: 64ch;
  margin: 0;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 12px 20px;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: #f7f6f1;
  transition: background .15s ease, color .15s ease;
}
.btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn.btn-accent {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn.btn-accent:hover {
  background: var(--ink);
  border-color: var(--ink);
}
.btn.btn-ghost {
  background: transparent;
  color: var(--ink);
}
.btn.btn-ghost:hover {
  background: var(--ink);
  color: #fff;
}
.btn-dl {
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--ink);
}
.btn-dl:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: transparent;
}
.btn-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.prose-placeholder {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--accent);
  background: #f3ecdf;
  border: 1px dashed var(--accent);
  padding: 3px 8px;
}

/* ---------- Sections ---------- */
.section { padding: 64px 0; border-bottom: 1px solid var(--line); }
.section:last-child { border-bottom: 0; }
.section-label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 12px;
}
h2 {
  font-family: var(--serif);
  font-size: 26px;
  line-height: 1.25;
  margin: 0 0 18px;
}
h3 {
  font-family: var(--serif);
  font-size: 19px;
  margin: 26px 0 8px;
}
.sec-intro { color: var(--muted); max-width: 62ch; margin: 0 0 24px; }

/* Method list */
.method { list-style: none; padding: 0; margin: 0 0 12px; counter-reset: m; }
.method li {
  counter-increment: m;
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 14px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}
.method li::before {
  content: counter(m, decimal-leading-zero);
  font-family: var(--mono);
  color: var(--accent);
  font-size: 14px;
  padding-top: 2px;
}
.method strong { display: block; grid-column: 2; font-size: 16px; }
.method span { grid-column: 2; color: var(--muted); font-size: 15px; }

/* Product / report card */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 28px;
}
.card .kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 8px;
}
.card h3 { margin-top: 0; }
.stats {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  margin: 18px 0 20px;
}
.stat .n {
  font-family: var(--serif);
  font-size: 34px;
  font-weight: 700;
  color: var(--ink);
}
.stat .l {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}
.price {
  font-family: var(--serif);
  font-size: 26px;
  font-weight: 700;
  margin: 4px 0;
}
.price small {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 400;
  color: var(--muted);
}

/* Definition / comparison table */
.tbl { width: 100%; border-collapse: collapse; font-size: 15px; }
.tbl th, .tbl td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.tbl th {
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  border-bottom: 1px solid var(--line-strong);
}
.tbl tr.check td .ok::before { content: "✓  "; color: var(--accent); }
.anyway-list { color: var(--muted); font-size: 15px; }

/* Disclosure / caution block */
.note {
  background: var(--well);
  border-left: 3px solid var(--accent);
  padding: 16px 20px;
  margin: 22px 0;
  font-size: 14.5px;
  color: #3a3831;
}
.note strong { display: block; margin-bottom: 4px; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: #b5b1a3;
  font-size: 14px;
  margin-top: 0;
}
.site-footer .wrap {
  padding-top: 36px;
  padding-bottom: 36px;
  display: grid;
  gap: 24px;
  grid-template-columns: 1fr auto;
}
.foot-brand {
  font-family: var(--serif);
  color: #f2f1ec;
  font-weight: 700;
  font-size: 17px;
  margin-bottom: 6px;
}
.site-footer a { color: #d8d5c9; }
.foot-links { display: flex; gap: 18px; flex-wrap: wrap; justify-content: flex-end; }
.foot-links a { text-decoration: none; color: #ccc8ba; }
.foot-links a:hover { color: #fff; }
.foot-meta { font-size: 12.5px; margin-top: 14px; grid-column: 1 / -1; }

/* ---------- Forms/contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}
.contact-grid .kv { margin: 0 0 14px; }
.kv .k {
  font-family: var(--mono);
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
}
.kv .v { font-size: 16px; }

/* ---------- FAQ ---------- */
details {
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
}
details summary {
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: 16px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
}
details summary::-webkit-details-marker { display: none; }
details summary::after { content: "+"; font-family: var(--mono); color: var(--accent); }
details[open] summary::after { content: "–"; }
details .a { color: var(--muted); padding-top: 10px; max-width: 68ch; font-size: 15px; }

/* ---------- Utility ---------- */
.mt2 { margin-top: 24px; }
.mt3 { margin-top: 36px; }
.center { text-align: center; }
.muted { color: var(--muted); }
.mono { font-family: var(--mono); font-size: 13px; color: var(--muted); }

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .site-header .wrap { flex-direction: column; align-items: flex-start; }
  .site-nav ul { justify-content: flex-start; font-size: 13px; }
  .hero { padding: 56px 0 44px; }
  .contact-grid { grid-template-columns: 1fr; }
  .site-footer .wrap { grid-template-columns: 1fr; }
  .foot-links { justify-content: flex-start; }
  .tbl { font-size: 14px; }
  .tbl th, .tbl td { padding: 10px 8px; }
}
/* ============================================================
   Catalog additions (Phase 3). Same palette and variables as the
   original stylesheet; nothing above is modified.
   ============================================================ */
.crumbs {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 14px;
}
.crumbs a { text-decoration: none; }

.cat-group { margin: 0 0 8px; }
.cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 20px;
  margin: 24px 0 0;
}
.product-card {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 22px 22px 18px;
  display: flex;
  flex-direction: column;
}
.product-card .kicker {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 6px;
}
.product-card h3 {
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.3;
  margin: 0 0 8px;
}
.product-card h3 a { color: var(--ink); text-decoration: none; }
.product-card h3 a:hover { color: var(--accent); }
.product-card .desc { color: var(--muted); font-size: 14.5px; margin: 0 0 14px; }
.card-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
  margin: 0 0 14px;
}
.card-stats div { min-width: 76px; }
.card-stats .n {
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.1;
}
.card-stats .l {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--muted);
}
.card-foot { margin-top: auto; display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.price-tag {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 10px;
}
.price-tag small { font-family: var(--sans); font-size: 13px; font-weight: 400; color: var(--muted); }

.badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .07em;
  text-transform: uppercase;
  padding: 3px 8px;
  border: 1px solid var(--line-strong);
  color: var(--muted);
  background: var(--well);
}
.badge.gate { border-color: var(--accent); color: var(--accent); background: #f7ece0; }

.btn.is-disabled {
  opacity: .55;
  cursor: not-allowed;
  border-style: dashed;
}
.btn.is-disabled:hover { background: var(--accent); border-color: var(--accent); }

.config-pending {
  background: #f7ece0;
  border: 1px dashed var(--accent);
  padding: 12px 16px;
  font-size: 14px;
  color: #4a3520;
  margin: 18px 0;
}
.config-pending code {
  font-family: var(--mono);
  font-size: 12.5px;
  background: #fff;
  padding: 1px 4px;
  border: 1px solid var(--line);
}
.config-pending-inline {
  font-size: 12.5px;
  color: var(--muted);
  margin: 10px 0 0;
  max-width: 46ch;
}

.offering { display: grid; grid-template-columns: 1fr 320px; gap: 30px; align-items: start; }
.offering .buybox {
  background: var(--surface);
  border: 1px solid var(--line-strong);
  padding: 22px;
  position: sticky;
  top: 20px;
}
.offering .buybox h3 { margin-top: 0; font-size: 17px; }
.offering ul.inc { list-style: none; padding: 0; margin: 0 0 16px; font-size: 14.5px; color: var(--muted); }
.offering ul.inc li { padding: 5px 0 5px 18px; position: relative; }
.offering ul.inc li::before { content: "\2713"; position: absolute; left: 0; color: var(--accent); }

.stat-row { display: flex; flex-wrap: wrap; gap: 26px; margin: 16px 0 20px; }

.kv-list { margin: 0; }
.kv-list div { display: grid; grid-template-columns: 210px 1fr; gap: 12px; padding: 7px 0;
  border-bottom: 1px solid var(--line); font-size: 14.5px; }
.kv-list .k { font-family: var(--mono); font-size: 11.5px; letter-spacing: .06em;
  text-transform: uppercase; color: var(--muted); padding-top: 2px; }

@media (max-width: 860px) {
  .offering { grid-template-columns: 1fr; }
  .offering .buybox { position: static; }
  .kv-list div { grid-template-columns: 1fr; gap: 2px; }
}