/* Chapman Services LLC — shared stylesheet
   Design concept: "operational blueprint" — a schematic, instrument-panel
   read that mirrors the subject matter (systems, data, process clarity)
   rather than a generic dark-SaaS or cream/serif template. */

:root {
  --color-bg: #161c24;
  --color-surface: #1c2530;
  --color-surface-2: #232f3d;
  --color-line: #34435a;
  --color-line-soft: #263242;
  --color-text: #e7ecf2;
  --color-text-muted: #93a1b4;
  --color-text-faint: #5c6a7e;
  --color-signal: #5fd4c1;
  --color-cta: #f2a65a;
  --color-cta-dark: #d98a3d;

  --font-display: "Space Grotesk", "Arial Narrow", sans-serif;
  --font-body: "IBM Plex Sans", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", "Courier New", monospace;

  --max-width: 1180px;
  --edge: clamp(20px, 5vw, 64px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--color-bg);
  background-image:
    linear-gradient(var(--color-line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-line-soft) 1px, transparent 1px);
  background-size: 64px 64px;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
img { max-width: 100%; display: block; }

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--edge);
}

/* ---------- coordinate label (signature detail) ---------- */
.coord {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
  text-transform: uppercase;
}

/* ---------- header / nav ---------- */
.site-header {
  border-bottom: 1px solid var(--color-line);
  background: rgba(22, 28, 36, 0.9);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 50;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: 0.01em;
}

.logo-mark {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  object-fit: contain;
}

.logo-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-faint);
  letter-spacing: 0.06em;
  margin-left: 2px;
}

nav.primary-nav ul {
  list-style: none;
  display: flex;
  gap: clamp(18px, 3vw, 36px);
  margin: 0;
  padding: 0;
}

nav.primary-nav a {
  text-decoration: none;
  font-size: 14px;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  position: relative;
  padding-bottom: 4px;
  transition: color 0.15s ease;
}

nav.primary-nav a:hover,
nav.primary-nav a[aria-current="page"] {
  color: var(--color-signal);
}

nav.primary-nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: var(--color-signal);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-line);
  color: var(--color-text);
  width: 40px;
  height: 40px;
  border-radius: 4px;
  cursor: pointer;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 13px 22px;
  border-radius: 3px;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--color-cta);
  color: #191008;
  font-weight: 600;
}
.btn-primary:hover { background: var(--color-cta-dark); }

.btn-ghost {
  border-color: var(--color-line);
  color: var(--color-text);
}
.btn-ghost:hover { border-color: var(--color-signal); color: var(--color-signal); }

/* ---------- hero ---------- */
.hero {
  padding: clamp(64px, 10vw, 120px) 0 clamp(48px, 8vw, 96px);
  border-bottom: 1px solid var(--color-line);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-signal);
  margin: 0 0 18px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 4.6vw, 56px);
  line-height: 1.08;
  font-weight: 500;
  margin: 0 0 22px;
  letter-spacing: -0.01em;
}

.hero p.lede {
  font-size: clamp(16px, 1.6vw, 19px);
  color: var(--color-text-muted);
  max-width: 46ch;
  margin: 0 0 32px;
}

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- schematic diagram (signature element) ---------- */
.schematic {
  width: 100%;
  height: auto;
}
.schematic .node-label {
  font-family: var(--font-mono);
  font-size: 11px;
  fill: var(--color-text-muted);
  letter-spacing: 0.04em;
}
.schematic .node-label.hub { fill: var(--color-bg); }
.schematic .hub-fill { fill: var(--color-signal); }
.schematic .node-fill { fill: var(--color-surface-2); stroke: var(--color-line); }
.schematic .line {
  stroke: var(--color-line);
  stroke-width: 1;
  fill: none;
}
.schematic .line.active {
  stroke: var(--color-signal);
  stroke-dasharray: 4 3;
}

@media (prefers-reduced-motion: no-preference) {
  .schematic .line.active {
    stroke-dashoffset: 40;
    animation: dash 3.5s linear infinite;
  }
}
@keyframes dash {
  to { stroke-dashoffset: 0; }
}

/* ---------- section scaffolding ---------- */
section { padding: clamp(56px, 8vw, 96px) 0; }
section + section { border-top: 1px solid var(--color-line); }

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: 44px;
  flex-wrap: wrap;
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 500;
  margin: 8px 0 0;
  letter-spacing: -0.01em;
}

.section-head .coord { margin: 0; }

.section-intro {
  max-width: 62ch;
  color: var(--color-text-muted);
  margin-top: 12px;
}

/* ---------- pillar / service cards ---------- */
.pillars {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
}

.pillar {
  background: var(--color-surface);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.pillar .idx {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-signal);
}

.pillar h3 {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 500;
  margin: 0;
}

.pillar p {
  color: var(--color-text-muted);
  font-size: 14.5px;
  margin: 0;
}

.pillar a.card-link {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  text-decoration: none;
}
.pillar a.card-link:hover { color: var(--color-signal); }

/* ---------- long-form service blocks ---------- */
.service-block {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 40px;
  padding: 40px 0;
}
.service-block + .service-block { border-top: 1px solid var(--color-line-soft); }

.service-block .tag {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-faint);
  letter-spacing: 0.04em;
}

.service-block h3 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 500;
  margin: 6px 0 0;
}

.service-block .body {
  max-width: 68ch;
}
.service-block .body p { color: var(--color-text-muted); }
.service-block .body p:first-child { color: var(--color-text); }

.service-block ul.detail-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.service-block ul.detail-list li {
  font-size: 14.5px;
  color: var(--color-text-muted);
  padding-left: 18px;
  position: relative;
}
.service-block ul.detail-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 1px;
  background: var(--color-signal);
}

/* ---------- about / engagement range ---------- */
.range-scale {
  border: 1px solid var(--color-line);
  padding: 30px clamp(20px, 4vw, 40px);
  margin-top: 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.range-scale .range-track {
  grid-column: 1 / -1;
  height: 2px;
  background: linear-gradient(90deg, var(--color-line) 0%, var(--color-signal) 100%);
  position: relative;
  margin: 6px 0 26px;
}
.range-scale .range-track::before,
.range-scale .range-track::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  transform: translateY(-50%);
  background: var(--color-bg);
  border: 1px solid var(--color-line);
}
.range-scale .range-track::before { left: -2px; }
.range-scale .range-track::after { right: -2px; background: var(--color-signal); border-color: var(--color-signal); }

.range-scale h4 {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-signal);
  margin: 0 0 8px;
}
.range-scale p { margin: 0; color: var(--color-text-muted); font-size: 14.5px; }

.quote-block {
  border-left: 2px solid var(--color-signal);
  padding-left: 24px;
  margin: 44px 0;
  max-width: 62ch;
}
.quote-block p {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 400;
  line-height: 1.4;
  color: var(--color-text);
  margin: 0;
}

/* ---------- contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 5vw, 64px);
}

.contact-details dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px 18px;
  margin: 28px 0 0;
}
.contact-details dt {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  color: var(--color-text-faint);
  letter-spacing: 0.05em;
}
.contact-details dd {
  margin: 0;
  color: var(--color-text);
}
.contact-details a { color: var(--color-signal); text-decoration: none; }
.contact-details a:hover { text-decoration: underline; }

form.contact-form {
  display: grid;
  gap: 18px;
}
.field { display: grid; gap: 8px; }
.field label {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}
.field input,
.field textarea {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: 3px;
  padding: 12px 14px;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 15px;
  resize: vertical;
}
.field input:focus,
.field textarea:focus {
  outline: 2px solid var(--color-signal);
  outline-offset: 1px;
  border-color: var(--color-signal);
}
.form-note {
  font-size: 13px;
  color: var(--color-text-faint);
  margin-top: -4px;
}

/* ---------- footer ---------- */
footer.site-footer {
  border-top: 1px solid var(--color-line);
  padding: 40px 0;
}
footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
footer .coord { margin: 0; }
footer .foot-links { display: flex; gap: 24px; }
footer .foot-links a {
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
footer .foot-links a:hover { color: var(--color-signal); }

/* ---------- CTA band ---------- */
.cta-band {
  text-align: left;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
  padding: 44px clamp(24px, 4vw, 48px);
  border: 1px solid var(--color-line);
  background: var(--color-surface);
}
.cta-band h2 {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.6vw, 28px);
  font-weight: 500;
  margin: 0 0 6px;
}
.cta-band p { margin: 0; color: var(--color-text-muted); }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; }
  .pillars { grid-template-columns: 1fr 1fr; }
  .service-block { grid-template-columns: 1fr; gap: 10px; }
  .contact-grid { grid-template-columns: 1fr; }
  .range-scale { grid-template-columns: 1fr; }
  nav.primary-nav { display: none; }
  .nav-toggle { display: block; }
  body.nav-open nav.primary-nav {
    display: block;
    position: fixed;
    top: 76px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-line);
    padding: 20px var(--edge) 30px;
    z-index: 49;
  }
  body.nav-open nav.primary-nav ul { flex-direction: column; gap: 18px; }
}

@media (max-width: 560px) {
  .pillars { grid-template-columns: 1fr; }
}