/* 
  DF Costruzioni - Premium Minimalist Design System 
*/
:root {
  /* Colors - Deep Premium Palette */
  --brand-primary: oklch(0.40 0.10 250); /* Deep Slate Blue */
  --brand-dark: oklch(0.15 0.05 250);   /* Near Black Navy */
  --brand-light: oklch(0.96 0.02 250);  /* Ultra subtle tint */
  
  --bg-white: oklch(0.99 0 0);
  
  --text-ink: oklch(0.20 0.02 250);
  --text-muted: oklch(0.55 0.02 250);
  
  --border-subtle: oklch(0.92 0.01 250);

  /* Typography - Minimalist */
  --font-sans: 'Inter', system-ui, sans-serif;
  --font-display: 'Inter', system-ui, sans-serif; /* Using Inter for everything to keep it sharp */
  
  /* Layout */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 8rem;
  
  --container-w: 1200px;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-white);
  color: var(--text-ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }

/* Utilities */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.bg-tint { background-color: var(--brand-light); }
.bg-dark { background-color: var(--brand-dark); color: var(--bg-white); }
.text-brand { color: var(--brand-primary); }

/* Minimalist Typography */
h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 400; /* Minimalist light weight */
  letter-spacing: -0.01em;
  color: var(--brand-dark);
}

.bg-dark h1, .bg-dark h2, .bg-dark h3 { color: var(--bg-white); }

/* Reduced sizes */
.display-large {
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 1.1;
  font-weight: 300;
  letter-spacing: -0.02em;
}

.heading-xl {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  line-height: 1.2;
  font-weight: 400;
}

.heading-lg {
  font-size: clamp(1.25rem, 2vw, 1.75rem);
  line-height: 1.3;
}

.body-lg {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 65ch;
  line-height: 1.6;
  font-weight: 300;
}

/* Animations */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

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

.animate-fade-up {
  animation: fadeUp 1s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  opacity: 0;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

/* Navigation */
.navbar {
  padding: var(--space-md) 0;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: transparent;
}

.navbar.dark-nav {
  position: relative;
  background-color: var(--bg-white);
  border-bottom: 1px solid var(--border-subtle);
}

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

.brand-logo {
  font-family: var(--font-display);
  font-size: 0.9rem; /* Minimalist */
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--bg-white);
  display: flex;
  align-items: center;
  gap: 1rem;
  text-transform: uppercase;
}

.dark-nav .brand-logo { color: var(--brand-dark); }

.logo-img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.nav-links {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.nav-item {
  font-weight: 400;
  color: rgba(255,255,255,0.8);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color 0.3s;
}

.dark-nav .nav-item { color: var(--text-muted); }
.nav-item:hover, .nav-item.active { color: var(--bg-white); }
.dark-nav .nav-item:hover, .dark-nav .nav-item.active { color: var(--brand-primary); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  border: 1px solid transparent;
}

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

.btn-primary:hover {
  background-color: transparent;
  border-color: var(--brand-primary);
  color: var(--brand-primary);
}

.navbar:not(.dark-nav) .btn-primary {
  background-color: var(--bg-white);
  color: var(--brand-dark);
}
.navbar:not(.dark-nav) .btn-primary:hover {
  background-color: transparent;
  color: var(--bg-white);
  border-color: var(--bg-white);
}

/* Cinematic Hero */
.hero-cinematic {
  height: 100vh;
  height: 100svh;
  position: relative;
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: var(--brand-dark);
}

.hero-bg {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  object-fit: cover;
  opacity: 0.5; /* Overlay effect */
  animation: fadeIn 2s ease-out;
  transform: scale(1.05); /* Subtle parallax starting point */
}

.hero-content {
  position: relative;
  z-index: 10;
  color: var(--bg-white);
  max-width: 800px;
}

.hero-content .display-large {
  color: var(--bg-white);
  margin-bottom: var(--space-md);
}

.hero-content .body-lg {
  color: rgba(255,255,255,0.8);
  margin-bottom: var(--space-lg);
}

/* Architectural Services Grid */
.arch-grid-section { padding: var(--space-xl) 0; }
.arch-header { margin-bottom: var(--space-xl); max-width: 700px; }

.arch-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px; /* Creates the thin border effect */
  background-color: var(--border-subtle);
  border: 1px solid var(--border-subtle);
}

.arch-card {
  background-color: var(--bg-white);
  padding: var(--space-lg);
  position: relative;
  overflow: hidden;
  transition: background-color 0.4s ease;
}

.arch-card:hover {
  background-color: var(--bg-tint);
}

.arch-card-number {
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
  letter-spacing: 0.1em;
}

.arch-card-title {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.arch-card-desc {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.6;
  font-weight: 300;
}

/* Footer */
.footer {
  background-color: var(--brand-dark);
  color: var(--bg-white);
  padding: var(--space-xl) 0 var(--space-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.footer-heading {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.5);
  margin-bottom: var(--space-sm);
}

.footer-text {
  color: rgba(255,255,255,0.8);
  font-size: 0.9rem;
  font-weight: 300;
}

.footer-bottom {
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.4);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}
/* --- Marketing & CRO Sections --- */
.btn-secondary {
  display: inline-block;
  padding: 1rem 2.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-decoration: none;
  border-radius: 4px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  background-color: transparent;
  color: var(--bg-white);
  border: 1px solid rgba(255,255,255,0.3);
}
.btn-secondary:hover {
  background-color: rgba(255,255,255,0.1);
  border-color: var(--bg-white);
}

.partner-band {
  background-color: var(--bg-tint);
  padding: 4rem 0;
  border-bottom: 1px solid var(--border-subtle);
  text-align: center;
}
.partner-title {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  margin-bottom: 2rem;
}
.partner-logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 4rem;
  flex-wrap: wrap;
}
.partner-logo-item {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 300;
  color: var(--brand-dark);
  opacity: 0.4;
  transition: opacity 0.3s;
}
.partner-logo-item:hover {
  opacity: 1;
}

.usp-section {
  padding: 8rem 0;
  background-color: var(--bg-white);
}
.usp-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
}
.usp-card {
  padding: 2.5rem;
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  background-color: var(--bg-light);
  transition: transform 0.3s ease;
}
.usp-card:hover {
  transform: translateY(-5px);
}
.usp-card h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}
.usp-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.lead-section {
  background-color: var(--brand-primary);
  color: white;
  padding: 6rem 0;
  text-align: center;
}
.lead-form-wrapper {
  max-width: 500px;
  margin: 2rem auto 0;
  display: flex;
  gap: 1rem;
}
.lead-input {
  flex: 1;
  padding: 1rem;
  border: none;
  border-radius: 4px;
  font-family: var(--font-body);
  outline: none;
}
.lead-btn {
  padding: 1rem 2rem;
  border: none;
  background-color: var(--brand-dark);
  color: white;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: opacity 0.3s;
}
.lead-btn:hover {
  opacity: 0.8;
}

.mobile-menu-btn { display: none; }

@media (max-width: 768px) {
  .arch-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .usp-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .partner-logos { gap: 2rem; flex-direction: column; }
  .lead-form-wrapper { flex-direction: column; }
  .hero-cinematic { align-items: flex-start; padding-top: 8rem; }
  
  /* Mobile Menu Styles */
  .mobile-menu-btn {
    display: block;
    background: none;
    border: none;
    color: var(--bg-white);
    font-size: 1.8rem;
    cursor: pointer;
    z-index: 101;
  }
  .dark-nav .mobile-menu-btn { color: var(--brand-dark); }
  
  .nav-links { 
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100vh; height: 100svh;
    background-color: var(--brand-dark);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    display: flex;
    opacity: 0;
    pointer-events: none;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 99;
  }
  
  .nav-links.nav-active {
    opacity: 1;
    pointer-events: auto;
  }
  
  .nav-links .nav-item {
    font-size: 1.5rem;
    color: var(--bg-white);
  }
  
  .nav-links .btn-primary {
    font-size: 1rem;
    margin-top: 1rem;
  }
}