/* === Blueprint / Technical Draft === */
:root {
  --blueprint: #1e3a5f;
  --draft-line: #2a5a8a;
  --grid-line: #c8dce8;
  --paper: #e8edf2;
  --marker: #d45d2b;
  --stamp: #c41e3a;
  --ink: #1a1a2e;
  --highlight: #f0c040;
  --white: #ffffff;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Courier New', 'Consolas', 'Liberation Mono', monospace;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 40px 40px, 40px 40px;
  background-position: -1px -1px, -1px -1px;
  min-height: 100vh;
}

/* Title block at top */
.title-block {
  background: var(--blueprint);
  color: var(--white);
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 4px solid var(--highlight);
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
  position: sticky;
  top: 0;
  z-index: 100;
}
.title-block .logo { font-size: 18px; font-weight: bold; }
.title-block nav a {
  color: var(--white);
  text-decoration: none;
  margin-left: 20px;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s;
  font-size: 13px;
}
.title-block nav a:hover,
.title-block nav a.active {
  border-bottom-color: var(--highlight);
}
.hamburger { display: none; cursor: pointer; font-size: 22px; }

/* Main content as drafting table */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px;
}

/* Blueprint border frame */
.blueprint-frame {
  border: 2px solid var(--draft-line);
  padding: 32px;
  margin-bottom: 40px;
  background: var(--paper);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 40px 40px, 40px 40px;
  position: relative;
}
.blueprint-frame::before {
  content: '';
  position: absolute;
  top: -2px; left: -2px; right: -2px; bottom: -2px;
  border: 2px solid var(--highlight);
  pointer-events: none;
}

/* Stamp corner */
.stamp {
  position: absolute;
  top: 16px;
  right: 16px;
  border: 2px solid var(--stamp);
  color: var(--stamp);
  padding: 6px 12px;
  font-size: 11px;
  font-weight: bold;
  letter-spacing: 2px;
  text-transform: uppercase;
  transform: rotate(8deg);
  background: transparent;
}

h1 {
  font-size: 28px;
  color: var(--blueprint);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 24px;
  border-bottom: 3px solid var(--draft-line);
  padding-bottom: 12px;
}
h2 {
  font-size: 20px;
  color: var(--blueprint);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin: 32px 0 16px;
  padding-left: 12px;
  border-left: 4px solid var(--marker);
}
h3 {
  font-size: 17px;
  color: var(--draft-line);
  margin: 20px 0 12px;
  letter-spacing: 1px;
}
p { margin-bottom: 16px; }

/* Hero */
.hero-blueprint {
  text-align: center;
  padding: 80px 32px;
  position: relative;
  min-height: 400px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.hero-blueprint h1 {
  font-size: 42px;
  border: none;
  padding: 0;
  margin-bottom: 12px;
}
.hero-blueprint .subtitle {
  font-size: 18px;
  color: var(--draft-line);
  letter-spacing: 4px;
  text-transform: uppercase;
}
.hero-blueprint .crosshairs {
  position: absolute;
  width: 40px; height: 40px;
}
.hero-blueprint .crosshairs::before,
.hero-blueprint .crosshairs::after {
  content: '';
  position: absolute;
  background: var(--draft-line);
}
.hero-blueprint .crosshairs::before {
  width: 100%; height: 1px;
  top: 50%; left: 0;
}
.hero-blueprint .crosshairs::after {
  width: 1px; height: 100%;
  left: 50%; top: 0;
}
.crosshairs-tl { top: 20px; left: 20px; }
.crosshairs-tr { top: 20px; right: 20px; }
.crosshairs-bl { bottom: 20px; left: 20px; }
.crosshairs-br { bottom: 20px; right: 20px; }

/* Cards with blueprint borders */
.card-blueprint {
  border: 2px solid var(--draft-line);
  padding: 24px;
  margin-bottom: 20px;
  background: rgba(255,255,255,0.5);
  position: relative;
}
.card-blueprint .card-number {
  position: absolute;
  top: -10px; left: 12px;
  background: var(--paper);
  padding: 0 8px;
  font-size: 12px;
  color: var(--draft-line);
  letter-spacing: 1px;
}

/* Grid */
.blueprint-grid {
  display: grid;
  gap: 24px;
}
.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-3 { grid-template-columns: 1fr 1fr 1fr; }

/* Specification table */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 14px;
}
.spec-table th, .spec-table td {
  border: 1px solid var(--draft-line);
  padding: 10px 14px;
  text-align: left;
}
.spec-table th {
  background: var(--blueprint);
  color: var(--white);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 12px;
}
.spec-table tr:nth-child(even) td {
  background: rgba(200, 220, 232, 0.3);
}

/* Annotation lines */
.annotation {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin: 12px 0;
  padding: 12px;
  border-left: 3px solid var(--marker);
}
.annotation .label {
  font-size: 11px;
  color: var(--marker);
  text-transform: uppercase;
  letter-spacing: 2px;
  min-width: 80px;
}

/* Dimension lines */
.dimension {
  height: 0;
  border-top: 2px solid var(--draft-line);
  position: relative;
  margin: 24px 0;
}
.dimension::before {
  content: '◄'; position: absolute; left: 0; top: -8px;
  color: var(--draft-line); font-size: 16px;
}
.dimension::after {
  content: '►'; position: absolute; right: 0; top: -8px;
  color: var(--draft-line); font-size: 16px;
}
.dimension-text {
  text-align: center;
  font-size: 11px;
  color: var(--draft-line);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-top: -6px;
}

/* Contact form */
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--draft-line);
  margin-bottom: 6px;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 14px;
  border: 2px solid var(--draft-line);
  background: var(--white);
  font-family: 'Courier New', monospace;
  font-size: 15px;
  color: var(--ink);
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--marker);
}
.btn-blueprint {
  display: inline-block;
  padding: 14px 32px;
  background: var(--blueprint);
  color: var(--white);
  border: none;
  font-family: 'Courier New', monospace;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 3px;
  cursor: pointer;
  transition: background 0.2s;
}
.btn-blueprint:hover { background: var(--draft-line); }

/* Footer with title block */
.footer-block {
  background: var(--blueprint);
  color: var(--white);
  padding: 24px;
  font-size: 12px;
  text-align: center;
  letter-spacing: 1px;
  border-top: 4px solid var(--highlight);
  margin-top: 60px;
}
.footer-block a { color: var(--highlight); text-decoration: none; }
.footer-block .rev { font-size: 10px; opacity: 0.7; letter-spacing: 2px; }

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px; height: 44px;
  background: var(--blueprint);
  border: 2px solid var(--highlight);
  color: var(--white);
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  z-index: 200;
}
.back-to-top.visible { display: flex; }

/* Mobile nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--blueprint);
  z-index: 200;
  padding: 80px 40px;
}
.mobile-nav.active { display: flex; flex-direction: column; }
.mobile-nav a {
  color: var(--white);
  text-decoration: none;
  font-size: 24px;
  letter-spacing: 3px;
  text-transform: uppercase;
  padding: 16px 0;
  border-bottom: 1px solid rgba(255,255,255,0.2);
}
.mobile-nav .close-nav {
  position: absolute;
  top: 16px; right: 20px;
  font-size: 32px;
  color: var(--white);
  cursor: pointer;
}

/* Responsive */
@media (max-width: 768px) {
  .title-block nav { display: none; }
  .hamburger { display: block; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .hero-blueprint { padding: 40px 16px; min-height: 280px; }
  .hero-blueprint h1 { font-size: 28px; }
  .blueprint-frame { padding: 16px; }
  main { padding: 20px 12px; }
}