/* Kahn Engineering Website Stylesheet */
/* Following design system from StyleD/kahn_engineering_design_system.json */

@import url('https://fonts.googleapis.com/css2?family=Josefin+Sans:wght@600;700&display=swap');

:root {
  /* Colors */
  --color-primary: #231105;
  --color-primary-light: #3D2A1E;
  --color-primary-dark: #1A0D04;
  --color-background: #FAF7E0;
  --color-background-alt: #F5F0DC;
  --color-surface: #F8F4E3;
  --color-surface-white: #FFFFFF;
  --color-accent: #8B5A3C;
  --color-accent-gold: #B8860B;
  --color-accent-rust: #A0522D;
  --color-border: #D4C9B8;
  --color-text: #231105;
  --color-text-secondary: #3D2A1E;
  --color-text-muted: #A69F8D;
  --color-text-inverse: #FAF7E0;
  
  /* Typography */
  --font-display: 'Josefin Sans', 'Bebas Neue', 'Oswald', sans-serif;
  --font-heading: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-body: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono: 'Courier New', Courier, monospace;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  --spacing-4xl: 96px;
  
  /* Effects */
  --border-radius: 0;
  --shadow-sm: 0 2px 8px rgba(35, 17, 5, 0.06);
  --shadow-md: 0 4px 16px rgba(35, 17, 5, 0.08);
  --shadow-lg: 0 8px 32px rgba(35, 17, 5, 0.1);
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: 36px;
  letter-spacing: 0.02em;
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: 28px;
  letter-spacing: 0.01em;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

h4 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.display-xl {
  font-family: var(--font-display);
  font-size: 72px;
  line-height: 1.1;
  letter-spacing: 0.15em;
  font-weight: 700;
}

.display-lg {
  font-family: var(--font-display);
  font-size: 48px;
  line-height: 1.15;
  letter-spacing: 0.1em;
  font-weight: 700;
}

p {
  margin-bottom: var(--spacing-md);
}

.body-lg {
  font-size: 18px;
  line-height: 1.6;
}

.body-sm {
  font-size: 14px;
  line-height: 1.5;
}

.caption {
  font-size: 12px;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-narrow {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-wide {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

section {
  padding: var(--spacing-4xl) var(--spacing-lg);
}

section.alt {
  background-color: var(--color-background-alt);
}

section.white {
  background-color: var(--color-surface-white);
}

/* Navigation */
nav {
  background-color: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  height: 80px;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  height: 50px;
  display: flex;
  align-items: center;
  max-width: 300px;
  flex-shrink: 0;
}

.logo a {
  display: flex;
  align-items: center;
  height: 100%;
  max-width: 100%;
}

.logo img {
  height: 100%;
  max-height: 50px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  display: block;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--spacing-xl);
  align-items: center;
}

.nav-links a {
  color: var(--color-text);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: color var(--transition-normal);
  position: relative;
}

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

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

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--color-text);
  cursor: pointer;
}

/* Hero Section */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background-color: var(--color-background);
  padding: var(--spacing-4xl) var(--spacing-lg);
}

.hero-content {
  max-width: 800px;
}

.hero h1 {
  margin-bottom: var(--spacing-lg);
}

.hero p {
  font-size: 18px;
  line-height: 1.8;
  margin-bottom: var(--spacing-2xl);
  color: var(--color-text-secondary);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 14px 32px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  border-radius: var(--border-radius);
  font-family: var(--font-heading);
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
}

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

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

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn-accent {
  background-color: var(--color-accent-rust);
  color: var(--color-text-inverse);
}

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

/* Cards */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius);
}

.card-elevated {
  background-color: var(--color-surface-white);
  border: none;
  box-shadow: var(--shadow-md);
}

.card h3 {
  margin-top: 0;
}

/* Grid */
.grid {
  display: grid;
  gap: var(--spacing-xl);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.feature-item {
  padding: var(--spacing-xl);
}

.feature-item h3 {
  color: var(--color-accent-rust);
  margin-bottom: var(--spacing-sm);
}

/* Dividers */
.divider {
  height: 1px;
  background-color: var(--color-border);
  margin: var(--spacing-2xl) 0;
  border: none;
}

.divider-decorative {
  height: 2px;
  width: 60px;
  background-color: var(--color-primary);
  margin: var(--spacing-lg) 0;
  border: none;
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  background-color: var(--color-surface-white);
  border: 1px solid var(--color-border);
  padding: 14px 16px;
  font-size: 16px;
  font-family: var(--font-body);
  border-radius: var(--border-radius);
  transition: border-color var(--transition-normal);
}

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

.form-group textarea {
  min-height: 150px;
  resize: vertical;
}

/* Footer */
footer {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--spacing-3xl) var(--spacing-lg) var(--spacing-lg);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
  color: var(--color-text-inverse);
  margin-bottom: var(--spacing-md);
}

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

.footer-section a {
  color: var(--color-border);
  text-decoration: none;
  transition: color var(--transition-normal);
}

.footer-section a:hover {
  color: var(--color-text-inverse);
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-primary-light);
  text-align: center;
  font-size: 14px;
  color: var(--color-text-muted);
}

/* Two Column Layout */
.two-column {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
}

.two-column img {
  width: 100%;
  height: auto;
  filter: sepia(10%) saturate(90%) brightness(98%);
}

/* Text Alignment */
.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

/* Utilities */
.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mt-2xl { margin-top: var(--spacing-2xl); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }

/* Solution Cards */
.solution-card {
  background-color: var(--color-surface-white);
  border: 1px solid var(--color-border);
  padding: var(--spacing-2xl);
  transition: all var(--transition-normal);
}

.solution-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
}

.solution-card h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.solution-card .icon {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
  color: var(--color-accent-rust);
}

/* Service List */
.service-list {
  list-style: none;
}

.service-list li {
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.service-list li:last-child {
  border-bottom: none;
}

.service-list li strong {
  color: var(--color-accent-rust);
  display: block;
  margin-bottom: var(--spacing-xs);
}

/* Responsive */
@media (max-width: 768px) {
  .logo {
    max-width: 200px;
    height: 40px;
  }
  
  .logo img {
    max-height: 40px;
  }
  
  .menu-toggle {
    display: block;
  }
  
  .nav-links {
    display: none;
    position: absolute;
    top: 80px;
    left: 0;
    right: 0;
    background-color: var(--color-background);
    flex-direction: column;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .display-xl {
    font-size: 48px;
  }
  
  .display-lg {
    font-size: 36px;
  }
  
  h1 {
    font-size: 28px;
  }
  
  .two-column {
    grid-template-columns: 1fr;
  }
  
  section {
    padding: var(--spacing-2xl) var(--spacing-md);
  }
  
  .hero {
    min-height: 60vh;
  }
}

@media (max-width: 480px) {
  .logo {
    max-width: 150px;
    height: 35px;
  }
  
  .logo img {
    max-height: 35px;
  }
  
  .display-xl {
    font-size: 36px;
  }
  
  .display-lg {
    font-size: 28px;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}