/* Modern Design System & Variables */
:root {
  /* Color Palette */
  --bg-primary: #f8fafc;
  --text-main: #0f172a;
  --text-muted: #475569;
  
  --etad-dark: #1c2156;
  --etad-medium: #4b529e;
  --etad-light: #7e84c4;
  
  /* Brand specific colors for cards */
  --color-parnassos-primary: #1c2156;
  --color-parnassos-bg: rgba(255, 255, 255, 0.88);
  --color-parnassos-border: rgba(255, 255, 255, 0.6);
  
  --color-diros-primary: #e6c594;
  --color-diros-text: #ffffff;
  --color-diros-bg: rgba(45, 38, 32, 0.82);
  --color-diros-border: rgba(230, 197, 148, 0.3);
  
  --color-vouliagmeni-primary: #a69259;
  --color-vouliagmeni-text: #2f3a22;
  --color-vouliagmeni-bg: rgba(240, 248, 245, 0.9);
  --color-vouliagmeni-border: rgba(255, 255, 255, 0.6);
  
  --color-achilleion-primary: #a33e2b;
  --color-achilleion-text: #4c1d13;
  --color-achilleion-bg: rgba(253, 244, 242, 0.9);
  --color-achilleion-border: rgba(255, 255, 255, 0.6);

  /* Fonts */
  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  /* Shadow & Transitions */
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 20px 25px -5px rgba(28, 33, 86, 0.08), 0 10px 10px -5px rgba(28, 33, 86, 0.04);
  --shadow-xl: 0 25px 50px -12px rgba(28, 33, 86, 0.18);
  
  --transition-smooth: cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset and Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Ambient glow blobs in background */
.ambient-glow {
  position: fixed;
  top: -10%;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  height: 600px;
  background: radial-gradient(circle at top, rgba(126, 132, 196, 0.08) 0%, rgba(248, 250, 252, 0) 70%);
  z-index: -1;
  pointer-events: none;
}

/* Header Styles */
.main-header {
  width: 100%;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid #e2e8f0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.01);
}

.header-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.logo-link {
  display: block;
  transition: transform 0.3s var(--transition-smooth);
}

.logo-link:hover {
  transform: scale(1.02);
}

.etad-logo {
  display: block;
  max-height: 48px;
  width: auto;
  object-fit: contain;
}

.header-title-container {
  text-align: right;
}

.header-title {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 3.5vw, 1.35rem);
  font-weight: 700;
  color: var(--etad-dark);
  letter-spacing: -0.02em;
}

.header-subtitle {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  display: block;
  margin-top: 0.1rem;
}

/* Main Layout Grid */
.portal-main {
  flex: 1;
  display: flex;
  align-items: center;
  padding: 3rem 2rem;
  max-width: 1240px;
  width: 100%;
  margin: 0 auto;
}

.grid-container {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.25rem;
}

/* Portal Cards */
.portal-card {
  position: relative;
  height: 350px;
  border-radius: 20px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(226, 232, 240, 0.8);
  transition: transform 0.5s var(--transition-smooth), 
              box-shadow 0.5s var(--transition-smooth);
}

.portal-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

/* Card Background Layer for parallax/zoom effect */
.card-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  transition: transform 0.8s var(--transition-smooth);
  z-index: 1;
}

.portal-card:hover .card-bg {
  transform: scale(1.08);
}

/* Overlay to ensure readability and structure */
.card-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, rgba(15, 23, 42, 0.15) 0%, rgba(15, 23, 42, 0.35) 100%);
  z-index: 2;
  transition: background-color 0.4s ease;
}

.portal-card:hover .card-overlay {
  background: linear-gradient(to bottom, rgba(15, 23, 42, 0.2) 0%, rgba(15, 23, 42, 0.4) 100%);
}

/* Mapping specific images with gradients as elegant fallback */
.card-parnassos .card-bg {
  background-image: url('assets/parnassos.png'), linear-gradient(135deg, #e2e8f0 0%, #cbd5e1 100%);
}
.card-diros .card-bg {
  background-image: url('assets/diros.png'), linear-gradient(135deg, #2a2521 0%, #171412 100%);
}
.card-vouliagmeni .card-bg {
  background-image: url('assets/vouliagmeni.png'), linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%);
}
.card-achilleion .card-bg {
  background-image: url('assets/achilleion.png'), linear-gradient(135deg, #ffedd5 0%, #fed7aa 100%);
}

/* Glassmorphic Central Box */
.card-glass {
  position: relative;
  width: 82%;
  height: 76%;
  border-radius: 16px;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  z-index: 3;
  transition: transform 0.5s var(--transition-smooth), 
              background-color 0.4s var(--transition-smooth),
              box-shadow 0.5s var(--transition-smooth);
  backdrop-filter: blur(12px) saturate(160%);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
  box-shadow: var(--shadow-sm);
}

.portal-card:hover .card-glass {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

/* Themes per Card */
.card-parnassos .card-glass {
  background-color: var(--color-parnassos-bg);
  border: 1px solid var(--color-parnassos-border);
  color: var(--color-parnassos-primary);
}
.card-parnassos:hover .card-glass {
  background-color: rgba(255, 255, 255, 0.94);
  border-color: rgba(255, 255, 255, 0.9);
}

.card-diros .card-glass {
  background-color: var(--color-diros-bg);
  border: 1px solid var(--color-diros-border);
  color: var(--color-diros-text);
}
.card-diros:hover .card-glass {
  background-color: rgba(45, 38, 32, 0.88);
  border-color: rgba(230, 197, 148, 0.5);
}

.card-vouliagmeni .card-glass {
  background-color: var(--color-vouliagmeni-bg);
  border: 1px solid var(--color-vouliagmeni-border);
  color: var(--color-vouliagmeni-text);
}
.card-vouliagmeni:hover .card-glass {
  background-color: rgba(240, 248, 245, 0.95);
  border-color: rgba(255, 255, 255, 0.9);
}

.card-achilleion .card-glass {
  background-color: var(--color-achilleion-bg);
  border: 1px solid var(--color-achilleion-border);
  color: var(--color-achilleion-text);
}
.card-achilleion:hover .card-glass {
  background-color: rgba(253, 244, 242, 0.96);
  border-color: rgba(255, 255, 255, 0.9);
}

/* Card Content Elements */
.card-brand-tag {
  font-size: clamp(0.55rem, 1.5vw, 0.65rem);
  font-weight: 800;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  margin-bottom: auto;
  opacity: 0.85;
}

.icon-wrapper {
  width: 150px;
  height: 95px;
  margin: 0.5rem 0 1rem 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.4s var(--transition-smooth);
}

.portal-card:hover .icon-wrapper {
  transform: translateY(-3px) scale(1.05);
}

.icon-wrapper img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
}

.card-title {
  font-family: var(--font-display);
  font-size: clamp(0.95rem, 2.5vw, 1.2rem);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin-bottom: auto;
}

/* Call to action element */
.card-action {
  margin-top: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  opacity: 0.85;
  transition: gap 0.3s var(--transition-smooth);
}

.portal-card:hover .card-action {
  gap: 0.65rem;
  opacity: 1;
}

.arrow-icon {
  width: 14px;
  height: 14px;
  transition: transform 0.3s var(--transition-smooth);
}

.portal-card:hover .arrow-icon {
  transform: translateX(2px);
}

/* Footer Styles */
.main-footer {
  width: 100%;
  border-top: 1px solid #e2e8f0;
  background: #ffffff;
  color: var(--text-muted);
  padding: 1.5rem 2rem;
  font-size: 0.8rem;
}

.footer-container {
  max-width: 1240px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.vat-info {
  margin-top: 0.2rem;
  font-size: 0.72rem;
  opacity: 0.75;
}

.contact-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.contact-link {
  color: var(--etad-medium);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s ease;
}

.contact-link:hover {
  color: var(--etad-dark);
  text-decoration: underline;
}

.separator {
  color: #cbd5e1;
}

/* Media Queries for Responsiveness */

/* Large Tablets & Small Desktops */
@media (max-width: 900px) {
  .grid-container {
    gap: 1.5rem;
  }
  .portal-card {
    height: 300px;
  }
  .card-title {
    font-size: 1.1rem;
  }
}

/* Tablets & Mobile Devices */
@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    text-align: center;
    padding: 1.5rem 1rem;
  }
  .header-title-container {
    text-align: center;
  }
  .portal-main {
    padding: 1.5rem 1rem;
  }
  .grid-container {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .portal-card {
    height: 280px;
  }
  .card-glass {
    width: 88%;
    height: 80%;
    padding: 1.5rem 1.25rem;
  }
  .footer-container {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }
  .contact-links {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .main-header {
    position: static;
  }
  .header-container {
    padding: 1.25rem 0.75rem;
  }
  .portal-main {
    padding: 1rem 0.75rem;
  }
  .portal-card {
    height: 250px;
  }
  .card-glass {
    width: 90%;
    height: 84%;
    padding: 1.25rem 1rem;
  }
  .icon-wrapper {
    width: 120px;
    height: 75px;
    margin: 0.25rem 0 0.75rem 0;
  }
  .card-action {
    margin-top: 0.75rem;
  }
}