/* =========================================
   DESIGN SYSTEM: THE ARCHITECTURAL EDITORIAL
   ========================================= */
:root {
  /* Colors */
  --primary: #001e40;
  --primary-container: #003366;
  --tertiary-container: #003a3a;
  --surface: #f8f9fa;
  --surface-container-low: #f3f4f5;
  --surface-container-lowest: #ffffff;
  --surface-container-highest: #e9ecef;
  --surface-dim: #e2e5e8;
  --on-surface: #191c1d;
  --on-surface-variant: #49454f;
  
  /* Borders & Shadows */
  --outline-variant: rgba(25, 28, 29, 0.15);
  --ambient-shadow: 0 12px 40px rgba(25, 28, 29, 0.06);
  --glass-bg: rgba(248, 249, 250, 0.85);
  
  /* Spacing Scale */
  --space-3: 1rem;
  --space-4: 1.4rem;
  --space-16: 5.5rem;
  --space-20: 7rem;
}

/* Base Reset */
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Inter', sans-serif;
  background-color: var(--surface);
  color: var(--on-surface);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, .display {
  font-family: 'Manrope', sans-serif;
  color: var(--on-surface);
  letter-spacing: -0.02em;
}
.display-lg { font-size: 3.5rem; font-weight: 700; line-height: 1.1; }
.display-sm { font-size: 2.25rem; font-weight: 600; line-height: 1.2; }
.body-lg { font-size: 1rem; color: var(--on-surface-variant); }
.label-md { font-size: 0.875rem; letter-spacing: 0.05em; text-transform: uppercase; font-weight: 600; }
.label-sm { font-size: 0.75rem; color: var(--on-surface-variant); text-transform: uppercase; font-weight: 600; }

/* Layout & Grid */
.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }
.section-spacing { padding: var(--space-16) 0; }
.grid { display: grid; gap: 2rem; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(400px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.flex-between { display: flex; justify-content: space-between; align-items: center; }

/* Navigation */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  padding: 1rem 0;
  border-bottom: 1px solid rgba(25,28,29,0.05); /* Ghost border fallback */
}
.nav-brand img { height: 80px; }
.nav-links { display: flex; gap: 2rem; align-items: center; }
.nav-links a {
  text-decoration: none; color: var(--on-surface-variant);
  font-weight: 600; font-size: 0.875rem; text-transform: uppercase;
  transition: color 0.3s;
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }

.nav-links.desktop-only a.active {
    color: var(--bs-primary-text-emphasis);
    border-bottom: 2px solid;
    padding-bottom: 4px!important;
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 28px; border-radius: 8px; text-decoration: none;
  font-family: 'Inter', sans-serif; border: none; cursor: pointer;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s;
  --bs-btn-padding-y:0.75rem!important; /*override bootstrap*/
  padding-top:0.75rem!important; /*override bootstrap*/
  padding-bottom:0.75rem!important; /*override bootstrap*/
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-container));
  color: #fff; box-shadow: 0 4px 14px rgba(0, 30, 64, 0.2);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0, 30, 64, 0.3); color: #fff; }
.btn-ghost { background: transparent; border: 1px solid var(--outline-variant); color: var(--on-surface); }
.btn-ghost:hover { background: var(--surface-container-low); }

/* Cards & Layout Tones */
.bg-low { background-color: var(--surface-container-low); }
.bg-white { background-color: var(--surface-container-lowest); }
.bg-primary-dark { background-color: var(--primary); color: #fff; }
.bg-primary-dark h2, .bg-primary-dark h3, .bg-primary-dark p { color: #fff; }
.card.bg-primary-dark { background-color: var(--primary); color: #fff; }

.card {
  background-color: var(--surface-container-lowest);
  border-radius: 12px; padding: 2.5rem;
  box-shadow: var(--ambient-shadow);
  transition: transform 0.4s ease;
  display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-5px); }

/* Form Elements */
.form-group { margin-bottom: 1.5rem; }
.form-control {
  background-color: var(--surface-container-highest);
  border: none; border-bottom: 2px solid transparent;
  padding: 16px; border-radius: 8px 8px 0 0;
  width: 100%; font-family: 'Inter', sans-serif; font-size: 1rem;
  transition: border-bottom-color 0.3s, background-color 0.3s;
}
.form-control:focus { outline: none; border-bottom-color: var(--primary); background-color: #e0e4e8; }
.form-label { display: block; margin-bottom: 0.5rem; }

/* Micro-interactions */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.8s ease, transform 0.8s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* Custom elements from designs */
.tag { display: inline-block; padding: 4px 12px; border-radius: 20px; font-size: 0.75rem; font-weight: 600; text-transform: uppercase; margin-bottom: 1rem; }
.tag-light { background: var(--surface-container-highest); color: var(--on-surface); }
.tag-dark { background: var(--tertiary-container); color: #fff; }

.comparison-table { width: 100%; border-collapse: collapse; margin-top: 2rem; }
.comparison-table th, .comparison-table td { padding: 1.5rem; text-align: left; border-bottom: 1px solid var(--outline-variant); }
.comparison-table th { background: var(--surface-container-low); font-family: 'Manrope', sans-serif; font-weight: 600; }
.check-icon { color: var(--primary); font-weight: bold; }
.cross-icon { color: var(--on-surface-variant); }

/* Footer */
.footer { background-color: var(--surface-container-low); padding: 4rem 0 2rem; border-top: 1px solid var(--outline-variant); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 2fr; gap: 2rem; }
.footer a { color: var(--on-surface-variant); text-decoration: none; display: block; margin-bottom: 0.5rem; }
.footer a:hover { color: var(--primary); }
.footer-bottom { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid rgba(25,28,29,0.1); display: flex; justify-content: space-between; font-size: 0.875rem; color: var(--on-surface-variant); }

/* =========================================
   MOBILE MENU OVERLAY & RESPONSIVENESS
   ========================================= */

/* Desktop / Mobile Visibility Toggles */
.desktop-only { display: flex; }
.mobile-only { display: none; }

/* Hamburger Button */
.mobile-menu-btn {
  background: none; border: none; cursor: pointer; 
  color: var(--primary); /*display: flex; */
  align-items: center; justify-content: center; padding: 0.25rem;
}
.mobile-menu-btn span { font-size: 2.5rem; }

/* Mobile Overlay Base */
.mobile-overlay {
  position: fixed; inset: 0; z-index: 1000; 
  display: flex; justify-content: flex-end;
}
.mobile-overlay.hidden { display: none; }

/* Dimmed Background */
.mobile-overlay-backdrop {
  position: absolute; inset: 0; 
  background: rgba(25, 28, 29, 0.6); 
  backdrop-filter: blur(4px);
  opacity: 0; transition: opacity 0.4s ease;
}

/* Side Panel Content */
.mobile-overlay-content {
  position: relative; width: 85%; max-width: 400px; height: 100%; 
  background: var(--surface-container-lowest); padding: 2rem; 
  display: flex; flex-direction: column; 
  transform: translateX(100%); transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1); 
  box-shadow: -10px 0 40px rgba(0,0,0,0.1);
}

/* Active State Transitions */
.mobile-overlay.active .mobile-overlay-backdrop { opacity: 1; }
.mobile-overlay.active .mobile-overlay-content { transform: translateX(0); }

/* Mobile Links Styling */
.mobile-nav-links { display: flex; flex-direction: column; gap: 1.5rem; }
.mobile-nav-links a {
  text-decoration: none; color: var(--on-surface-variant); 
  font-weight: 600; font-size: 1.25rem; 
  text-transform: uppercase; letter-spacing: 0.05em;
}
.mobile-nav-links a.active, .mobile-nav-links a:hover { color: var(--primary); }

/* =========================================
   MEDIA QUERIES (max-width: 992px)
   ========================================= */
@media (max-width: 992px) {
  /* Toggles */
  .desktop-only { display: none !important; }
  .mobile-only { display: block; }
  
  /* Typography Scaling */
  .display-lg { font-size: 2.5rem; }
  .display-sm { font-size: 2rem; }
  
  /* Spacing Adjustments */
  .section-spacing { padding: 4rem 0; }
  .container { padding: 0 1.5rem; }
  
  /* Layout Grid Breakdowns */
  .grid, .grid-2, .grid-3, .hero-asymmetric, .footer-grid {
    grid-template-columns: 1fr !important;
    gap: 2rem !important;
  }
  
  /* Specifically target split grids used in Contact and Location sections */
  div[style*="grid-template-columns: 1fr 1.5fr;"],
  div[style*="grid-template-columns: 1fr 2fr;"],
  div[style*="grid-template-columns: 1fr 1fr;"] {
    grid-template-columns: 1fr !important;
    gap: 2.5rem !important;
  }
  
  /* Custom fixes for specific elements */
  .col-span-2 { grid-column: span 1 !important; flex-direction: column !important; align-items: flex-start !important; }
  .col-span-2 > div:last-child { margin-top: 1.5rem; } /* Adds space above the icons in the Όλα-σε-ένα card */
  
  /* Comparison Table Scroll Fix */
  .comparison-table { width: 100%; min-width: 600px; }
  .table-wrapper { overflow-x: auto; -webkit-overflow-scrolling: touch; }
}