/* ===================================
   PIA Industries - Design System
   =================================== */

/* CSS Custom Properties */
:root {
  /* Colors - Primary Palette (Rich Navy Blue) */
  --color-navy: #1a3a5c;
  --color-navy-light: #2d5a8a;
  --color-navy-dark: #0d1f33;
  --color-navy-deep: #142840;
  
  /* Complementary Colors */
  --color-gold: #c9a962;
  --color-gold-light: #dbc78a;
  --color-gold-dark: #a88b3d;
  --color-copper: #c47d5f;
  --color-copper-light: #d9a08a;
  --color-steel-blue: #5a8ab8;
  --color-steel-blue-light: #a8c0d4;
  
  /* Legacy aliases for compatibility */
  --color-forest-green: var(--color-navy);
  --color-forest-green-light: var(--color-navy-light);
  --color-forest-green-dark: var(--color-navy-dark);
  
  /* Neutrals */
  --color-charcoal: #1e2a3a;
  --color-slate: #5a6b7d;
  --color-slate-light: #8a9bab;
  --color-light-gray: #f0f4f8;
  --color-white: #ffffff;
  --color-off-white: #f5f7fa;
  --color-cream: #f8f6f0;
  
  /* Semantic Colors */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;
  
  /* Typography */
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-accent: 'Montserrat', sans-serif;
  
  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 400ms ease-in-out;
  
  /* Layout */
  --max-width-sm: 640px;
  --max-width-md: 768px;
  --max-width-lg: 1024px;
  --max-width-xl: 1280px;
  --max-width-2xl: 1536px;
}

/* ===================================
   Reset & Base Styles
   =================================== */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-charcoal);
  background-color: var(--color-off-white);
  -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-navy-dark);
  margin-bottom: var(--space-4);
}

h1 {
  font-size: var(--text-5xl);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--text-4xl);
  letter-spacing: -0.01em;
}

h3 {
  font-size: var(--text-3xl);
}

h4 {
  font-size: var(--text-2xl);
}

h5 {
  font-size: var(--text-xl);
}

h6 {
  font-size: var(--text-lg);
}

p {
  margin-bottom: var(--space-4);
  color: var(--color-slate);
}

a {
  color: var(--color-navy);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-navy-light);
}

strong {
  font-weight: 600;
  color: var(--color-charcoal);
}

/* ===================================
   Navigation
   =================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--color-navy-dark);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-md);
  z-index: 1000;
  transition: all var(--transition-base);
}

.navbar.scrolled {
  box-shadow: var(--shadow-lg);
  background: var(--color-navy-deep);
}

.nav-container {
  max-width: var(--max-width-xl);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-white);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

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

.nav-logo img {
  filter: brightness(0) invert(1);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-8);
  align-items: center;
}

.nav-link {
  font-family: var(--font-accent);
  font-size: var(--text-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.85);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
}

.nav-link.active {
  color: var(--color-gold);
  font-weight: 600;
}

.nav-cta {
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-light));
  color: var(--color-navy-dark) !important;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-weight: 600;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  background: linear-gradient(135deg, var(--color-gold-light), var(--color-gold));
}

/* Mobile Menu Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background: var(--color-white);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

/* ===================================
   Hero Section
   =================================== */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--color-navy-dark) 0%, var(--color-navy) 40%, var(--color-navy-deep) 100%);
  overflow: hidden;
  padding-top: 80px;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.03)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
  opacity: 0.5;
}

.hero-container {
  position: relative;
  max-width: var(--max-width-xl);
  margin: 0 auto;
  padding: var(--space-12) var(--space-6);
  z-index: 1;
}

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

.hero-badge {
  display: inline-block;
  background: rgba(212, 175, 55, 0.2);
  color: var(--color-gold);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-family: var(--font-accent);
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-6);
  border: 1px solid rgba(212, 175, 55, 0.3);
}

.hero h1 {
  font-size: var(--text-6xl);
  color: var(--color-white);
  margin-bottom: var(--space-6);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: var(--text-xl);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--space-8);
  line-height: 1.6;
}

.hero-cta-group {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* ===================================
   Buttons
   =================================== */

.btn {
  display: inline-block;
  padding: var(--space-4) var(--space-8);
  font-family: var(--font-accent);
  font-size: var(--text-base);
  font-weight: 600;
  text-align: center;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-light));
  color: var(--color-navy-dark);
  box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-xl);
  background: linear-gradient(135deg, var(--color-gold-light), var(--color-gold));
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  border: 2px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-3px);
}

/* ===================================
   Cards & Glassmorphism
   =================================== */

.card {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-2xl);
}

.card-glass {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--color-white);
}

.card-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-light));
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-3xl);
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-md);
}

.card h3 {
  color: inherit;
  margin-bottom: var(--space-3);
}

.card p {
  color: inherit;
  opacity: 0.9;
}

/* ===================================
   Sections
   =================================== */

.section {
  padding: var(--space-20) var(--space-6);
}

.section-container {
  max-width: var(--max-width-xl);
  margin: 0 auto;
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--space-16);
}

.section-badge {
  display: inline-block;
  background: rgba(26, 58, 92, 0.1);
  color: var(--color-navy);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-family: var(--font-accent);
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-4);
}

.section-title {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-4);
}

.section-description {
  font-size: var(--text-lg);
  color: var(--color-slate);
}

/* ===================================
   Grid Layouts
   =================================== */

.grid {
  display: grid;
  gap: var(--space-8);
}

.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));
}

/* ===================================
   Utilities
   =================================== */

.container {
  max-width: var(--max-width-xl);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

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

.text-gradient {
  background: linear-gradient(135deg, var(--color-navy), var(--color-gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.bg-light {
  background-color: var(--color-light-gray);
}

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

.mb-4 {
  margin-bottom: var(--space-4);
}

.mb-8 {
  margin-bottom: var(--space-8);
}

.mt-8 {
  margin-top: var(--space-8);
}

/* ===================================
   Animations
   =================================== */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease-out forwards;
}

.fade-in {
  animation: fadeIn 0.6s ease-out forwards;
}

/* Stagger animations */
.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 768px) {
  :root {
    --text-5xl: 2.5rem;
    --text-6xl: 3rem;
  }
  
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-navy-dark);
    flex-direction: column;
    padding: var(--space-6);
    box-shadow: var(--shadow-lg);
    gap: var(--space-4);
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .hero h1 {
    font-size: var(--text-4xl);
  }
  
  .hero-subtitle {
    font-size: var(--text-lg);
  }
  
  .hero-cta-group {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .section {
    padding: var(--space-12) var(--space-4);
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: var(--text-3xl);
  }
  
  .section-title {
    font-size: var(--text-3xl);
  }
}