:root {
  --primary-color: #1a1a1a;
  --accent-color: #d4af37;
  --bg-color: #f8f9fa;
  --card-bg: #ffffff;
  --border-color: #e0e0e0;
  --text-main: #333333;
  --text-muted: #666666;
  --font-main: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --font-display: 'Georgia', serif;
  --wf-space-sm: 8px;
  --wf-space-md: 16px;
  --wf-space-lg: 24px;
  --wf-space-xl: 48px;
  --wf-space-2xl: 64px;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 4rem);
}

header {
  background: var(--primary-color);
  color: white;
  padding: var(--wf-space-lg) 0;
  border-bottom: 4px solid var(--accent-color);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  font-family: var(--font-display);
  font-size: 1.8rem;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: var(--wf-space-lg);
}

.nav-links a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  text-transform: uppercase;
  transition: color 0.3s;
}

.nav-links a:hover {
  color: var(--accent-color);
}

main {
  padding-bottom: var(--wf-space-2xl);
}

section {
  margin-top: var(--wf-space-xl);
}

main > :first-child {
  margin-top: 0;
}

.hero {
  background: white;
  padding: var(--wf-space-2xl) 0;
  border-bottom: 1px solid var(--border-color);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: 3rem;
  margin-bottom: var(--wf-space-md);
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 800px;
}

.blueprint-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--wf-space-xl);
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}

.card-header {
  padding: var(--wf-space-lg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #fcfcfc;
}

.card-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  margin: 0;
}

.card-content {
  padding: var(--wf-space-xl);
  display: flex;
  justify-content: center;
  align-items: center;
  background: #fff;
  overflow: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--primary-color);
  color: white;
  text-decoration: none;
  border-radius: 4px;
  font-weight: 600;
  transition: all 0.3s;
  border: none;
  cursor: pointer;
}

.btn:hover {
  background: var(--accent-color);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}

.btn-outline:hover {
  background: var(--primary-color);
  color: white;
}

/* Structural Diagram Styles */
.structural-diagram {
  position: relative;
  width: 100%;
  max-width: 900px;
  aspect-ratio: 1.4;
  border: 2px solid #333;
  background-color: #fff;
  padding: 40px;
}

.grid-lines {
  position: absolute;
  top: 40px;
  left: 40px;
  right: 40px;
  bottom: 40px;
  display: grid;
  grid-template-columns: 12fr 10fr 8fr 8fr 8fr 10fr 12fr;
  grid-template-rows: 5fr 15fr 8fr 12fr 7fr;
  border: 1px solid #999;
}

.grid-cell {
  border: 0.5px solid #ddd;
  position: relative;
}

.column-point {
  position: absolute;
  width: 12px;
  height: 12px;
  background: #000;
  top: -6px;
  left: -6px;
  z-index: 2;
}

.column-point::after {
  content: '✕';
  color: white;
  font-size: 8px;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
}

.dimension-line {
  position: absolute;
  font-size: 10px;
  color: #666;
  text-align: center;
}

.footer {
  margin-top: var(--wf-space-2xl);
  padding: var(--wf-space-xl) 0;
  background: var(--primary-color);
  color: white;
  text-align: center;
}

.download-bar {
  display: flex;
  justify-content: center;
  gap: var(--wf-space-md);
  margin-top: var(--wf-space-lg);
}

@media print {
  .no-print {
    display: none;
  }
  body {
    background: white;
  }
  .card {
    border: none;
    box-shadow: none;
  }
  .container {
    padding: 0;
  }
}