/* RDA Fab LLC - Metal / Industrial Theme */
:root {
  --bg-dark: #0f0f0f;
  --bg-charcoal: #1a1a1a;
  --bg-steel: #242424;
  --bg-card: #2a2a2a;
  --text-primary: #f0f0f0;
  --text-secondary: #b0b0b0;
  --text-muted: #777777;
  --accent: #c0c0c0;
  --accent-hover: #e0e0e0;
  --border: #3a3a3a;
  --highlight: #8a8a8a;
  --success: #4a7c59;
  --font-main: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --max-width: 1100px;
  --radius: 6px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* Typography */
h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.25;
  color: var(--text-primary);
}

h1 { font-size: 2.4rem; }
h2 { font-size: 1.8rem; margin-bottom: 1rem; }
h3 { font-size: 1.3rem; margin-bottom: 0.75rem; }

p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

/* Layout */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header / Nav */
header {
  background: var(--bg-charcoal);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  letter-spacing: 0.5px;
}

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

nav ul {
  display: flex;
  list-style: none;
  gap: 1.75rem;
}

nav a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
}

nav a:hover,
nav a.active {
  color: var(--text-primary);
}

.nav-cta {
  background: var(--accent);
  color: var(--bg-dark) !important;
  padding: 0.45rem 1rem;
  border-radius: var(--radius);
  font-weight: 600;
}

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

/* Mobile menu */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero */
.hero {
  background: linear-gradient(180deg, var(--bg-charcoal) 0%, var(--bg-dark) 100%);
  padding: 4.5rem 0 3.5rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.hero h1 {
  margin-bottom: 1rem;
  letter-spacing: -0.5px;
}

.hero .lead {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-dark);
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--bg-dark);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Sections */
section {
  padding: 3.5rem 0;
}

.section-title {
  text-align: center;
  margin-bottom: 2.5rem;
}

.section-title p {
  max-width: 550px;
  margin: 0.5rem auto 0;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.75rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.card:hover {
  border-color: var(--highlight);
}

.card-img {
  background: var(--bg-steel);
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.card-body {
  padding: 1.5rem;
}

.card-body h3 {
  margin-bottom: 0.5rem;
}

.card-body p {
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
}

.card-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

/* Specs table */
.specs-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

.specs-table th,
.specs-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.specs-table th {
  background: var(--bg-steel);
  color: var(--text-primary);
  font-weight: 600;
  width: 40%;
}

.specs-table td {
  color: var(--text-secondary);
}

/* Components list */
.component-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.component-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
}

.component-item h4 {
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
}

.component-item p {
  font-size: 0.85rem;
  margin: 0;
  color: var(--text-muted);
}

/* Forms */
.form-wrapper {
  max-width: 560px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.7rem 0.9rem;
  background: var(--bg-steel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

/* Footer */
footer {
  background: var(--bg-charcoal);
  border-top: 1px solid var(--border);
  padding: 2.5rem 0 1.5rem;
  margin-top: auto;
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-brand h3 {
  margin-bottom: 0.5rem;
}

.footer-brand p {
  font-size: 0.9rem;
}

.footer-col h4 {
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 0.4rem;
}

.footer-col a {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-col a:hover {
  color: var(--accent);
}

.footer-bottom {
  text-align: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Utilities */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mb-2 { margin-bottom: 1rem; }

/* Responsive */
@media (max-width: 768px) {
  h1 { font-size: 1.9rem; }
  h2 { font-size: 1.5rem; }

  .menu-toggle {
    display: block;
  }

  nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-charcoal);
    border-bottom: 1px solid var(--border);
    padding: 1rem;
  }

  nav.open {
    display: block;
  }

  nav ul {
    flex-direction: column;
    gap: 0.75rem;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .hero {
    padding: 3rem 0 2.5rem;
  }
}