/* Computedome — product-forward visual system
   Display: Source Serif 4 · Body: IBM Plex Sans · Labels/mono: IBM Plex Mono */

:root {
  --ink: #0e1414;
  --ink-soft: #3a4444;
  --paper: #faf9f6;
  --paper-dim: #f1efe9;
  --line: #dcd8cf;
  --navy: #0b1a2b;
  --navy-soft: #142a42;
  --accent: #ff6a2b;
  --accent-ink: #1a0800;
  --teal: #1f6f6a;
  --max: 1180px;
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: "Source Serif 4", Georgia, serif;
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.5em;
  color: var(--ink);
}

h1 { font-size: clamp(2.4rem, 5vw, 3.8rem); }
h2 { font-size: clamp(1.7rem, 3.2vw, 2.4rem); }
h3 { font-size: 1.25rem; }

p { margin: 0 0 1em; color: var(--ink-soft); }

a { color: inherit; }

.label {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.78rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--teal);
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 32px;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* Header / nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(250, 249, 246, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.wordmark {
  font-family: "Source Serif 4", serif;
  font-weight: 600;
  font-size: 1.3rem;
  text-decoration: none;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.wordmark span { color: var(--accent); }

nav.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

nav.main-nav a {
  font-size: 0.95rem;
  text-decoration: none;
  color: var(--ink-soft);
  transition: color 0.15s ease;
}

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

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--ink);
  color: var(--paper) !important;
  padding: 10px 18px;
  border-radius: 4px;
  font-size: 0.9rem !important;
  font-weight: 500;
}

.nav-cta:hover { background: var(--accent); color: var(--accent-ink) !important; }

.menu-toggle { display: none; }

/* Hero */
.hero {
  background: var(--navy);
  color: var(--paper);
  padding: 88px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero .wrap {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.hero h1 { color: #fff; }
.hero .lede { color: #c9d3d8; font-size: 1.15rem; max-width: 46ch; }

.hero-ctas {
  display: flex;
  gap: 16px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.98rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { transform: translateY(-1px); background: #ff7f47; }

.btn-secondary { background: transparent; color: #fff; border-color: rgba(255,255,255,0.35); }
.btn-secondary:hover { border-color: #fff; }

.btn-dark { background: var(--ink); color: var(--paper); }
.btn-dark:hover { background: var(--accent); color: var(--accent-ink); }

/* Loop diagram */
.loop-diagram { width: 100%; height: auto; }
.loop-diagram .node-label {
  font-family: "IBM Plex Mono", monospace;
  font-size: 13px;
  letter-spacing: 0.04em;
  fill: #eef2f2;
}
.loop-diagram .node-circle { fill: var(--navy-soft); stroke: var(--accent); stroke-width: 1.5; }
.loop-diagram .loop-arrow { stroke: rgba(255,255,255,0.35); stroke-width: 1.5; fill: none; }

/* Proof band */
.proof-band {
  background: var(--paper-dim);
  border-bottom: 1px solid var(--line);
  padding: 22px 0;
  text-align: center;
}
.proof-band p {
  margin: 0;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

/* Pillars */
.pillars { padding: 88px 0; }
.pillars-head { max-width: 60ch; margin-bottom: 48px; }

.pillar-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.pillar-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 32px 28px;
  text-decoration: none;
  color: inherit;
  display: block;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.pillar-card:hover { border-color: var(--accent); transform: translateY(-2px); }

.pillar-index {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 12px;
  display: block;
}

.pillar-card p { margin-bottom: 0; }

/* Section generic */
.section { padding: 80px 0; }
.section-alt { background: var(--paper-dim); }
.section-head { max-width: 70ch; margin-bottom: 40px; }

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}

.system-layer {
  display: grid;
  grid-template-columns: 0.5fr 1fr;
  gap: 40px;
  padding: 40px 0;
  border-top: 1px solid var(--line);
  align-items: start;
}
.system-layer:first-of-type { border-top: none; }

.system-layer h3 { margin-bottom: 12px; }

.performance-cta {
  margin-top: 16px;
  background: var(--navy);
  color: var(--paper);
  border-radius: 6px;
  padding: 40px;
  text-align: center;
}
.performance-cta p { color: #c9d3d8; margin-bottom: 20px; }

/* Timeline comparison */
.timeline-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin: 40px 0;
}
.timeline-card {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 28px;
  background: #fff;
}
.timeline-card.dome { border-color: var(--accent); background: #fff8f4; }
.timeline-card .label { display: block; margin-bottom: 10px; }
.timeline-steps { list-style: none; margin: 16px 0 0; padding: 0; }
.timeline-steps li {
  padding: 10px 0;
  border-top: 1px solid var(--line);
  font-size: 0.95rem;
}
.timeline-steps li:first-child { border-top: none; }

.reason-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}
.reason-grid div {
  border-left: 2px solid var(--accent);
  padding-left: 18px;
}

/* About */
.about-hero { padding: 72px 0 40px; max-width: 72ch; }
.boilerplate {
  background: var(--paper-dim);
  border-radius: 6px;
  padding: 32px 36px;
  font-size: 1rem;
  border: 1px solid var(--line);
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
}

.contact-intro .trust-list {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.form-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 36px;
}

.hidden-field { position: absolute; left: -9999px; }

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

form label {
  display: block;
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin-bottom: 16px;
}

form input, form textarea, form select {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 11px 12px;
  font: inherit;
  font-size: 0.95rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper);
  color: var(--ink);
}

form input:focus, form textarea:focus, form select:focus {
  outline: 2px solid var(--teal);
  outline-offset: 1px;
}

.optional { color: #9a958a; font-weight: 400; }

.submit-button {
  width: 100%;
  border: none;
  cursor: pointer;
  margin-top: 8px;
}

.submit-button:disabled { opacity: 0.6; cursor: not-allowed; }

.form-error { color: #b3261e; font-size: 0.9rem; }

.form-note { font-size: 0.82rem; color: #9a958a; margin-top: 14px; margin-bottom: 0; }

.form-success {
  text-align: center;
  padding: 40px 10px;
}
.form-success .success-icon {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--teal);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  margin: 0 auto 16px;
}
.form-success span {
  display: block;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 8px;
}

/* Footer */
footer.site-footer {
  border-top: 1px solid var(--line);
  padding: 48px 0 32px;
  background: var(--paper-dim);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  font-size: 0.9rem;
}
.footer-links a { text-decoration: none; color: var(--ink-soft); }
.footer-links a:hover { color: var(--ink); }

.footer-legal {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 0.8rem;
  color: #9a958a;
  line-height: 1.6;
}

@media (max-width: 900px) {
  .hero .wrap { grid-template-columns: 1fr; }
  .pillar-grid { grid-template-columns: 1fr; }
  .two-col { grid-template-columns: 1fr; }
  .system-layer { grid-template-columns: 1fr; }
  .timeline-compare { grid-template-columns: 1fr; }
  .reason-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .field-row { grid-template-columns: 1fr; }
  nav.main-nav { display: none; }
}