/* --- Γενικά Στυλ --- */
        :root {
            --primary-color: #003A7A;
            --secondary-color: #003A7A;
            --light-blue: #E6F3FF;
            --dark-blue: #003A7A;
            --gray: #f4f4f4;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Roboto', 'Open Sans', 'Helvetica Neue', sans-serif;
            line-height: 1.6;
            color: #333;
            background: linear-gradient(to bottom right, #f5faff, #e6f0ff);
        }
        body {
    background-color: #ffffff;
    background-image: radial-gradient(circle at 1px 1px, #e0e0e0 1px, transparent 0);
    background-size: 20px 20px;
    color: #333;
}



        /* --- Κεφαλίδα --- */
        header {
            background-color: #003A7A;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        
.header-container {
  display: flex;
  flex-direction: row;
  justify-content: center; /* ✅ Κεντράρει όλο το περιεχόμενο */
  align-items: center;
  gap: 40px; /* απόσταση μεταξύ logo και nav */
  padding: 15px 20px;
}


.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}


        
        .logo h1 {
            color: #ffffff;
            font-size: 24px;
            margin-left: 8px;
        }
        
        .logo-img {
            height: 80px;
            width: 80px;
        }
        
        /* --- Πλοήγηση --- */
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: #ffffff;
            cursor: pointer;
        }
        
        .main-nav ul {
            display: flex;
            white-space: nowrap;
            list-style-type: none;
        }
        
        .main-nav li {
            margin-left: 30px;
        }
        
        .main-nav a {
            text-decoration: none;
            color: #ffffff;
            font-weight: 500;
            font-size: 16px;
            position: relative;
            transition: color 0.3s;
        }
        
        .main-nav a:hover {
            color: #b1b1b1;
        }
        
        .main-nav a.active {
            color: #ffffff;
        }
        
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: #ffffff;
        }
        
        /* --- Κύριο Περιεχόμενο --- */
        main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 40px 20px;
        }
        
        section {
            margin-bottom: 60px;
        }
        
        h2 {
            color: var(--primary-color);
            margin-bottom: 20px;
            font-size: 28px;
            position: relative;
        }
        
        h2::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 0;
            width: 60px;
            height: 3px;
            background-color: var(--secondary-color);
        }
        
        h3 {
            color: var(--dark-blue);
            margin: 25px 0 15px;
            font-size: 22px;
        }
        
        p {
            margin-bottom: 15px;
            font-size: 16px;
        }
        
        /* --- Κουμπιά --- */
        .button {
            display: inline-block;
            padding: 12px 24px;
            background-color: var(--primary-color);
            color: #fff;
            text-decoration: none;
            border-radius: 5px;
            font-weight: 500;
            transition: background-color 0.3s;
            margin-right: 15px;
            margin-bottom: 15px;
        }
        
        .button:hover {
            background-color: var(--dark-blue);
        }
        
        .button-outline {
            background-color: transparent;
            border: 2px solid var(--primary-color);
            color: var(--primary-color);
        }
        
        .button-outline:hover {
            background-color: var(--light-blue);
        }
        
        /* --- Κάρτες --- */
        .card {
            background-color: #fff;
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            padding: 25px;
            margin-bottom: 30px;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        
        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
        }
        
        .card h3 {
            margin-top: 0;
        }
        
        /* --- Hero Section --- */
        .hero {
            background-color: var(--light-blue);
            padding: 60px 0;
            text-align: center;
            margin-bottom: 40px;
        }
        
        .hero-content {
            max-width: 800px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        .hero h1 {
            color: var(--primary-color);
            font-size: 36px;
            margin-bottom: 20px;
        }
        
        .hero p {
            font-size: 18px;
            margin-bottom: 30px;
        }
        
        /* --- Feature Boxes --- */
        .feature-boxes {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }
        
        .feature-box {
            background-color: #fff;
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            padding: 30px;
            text-align: center;
            transition: transform 0.3s;
        }
        
        .feature-box:hover {
            transform: translateY(-5px);
        }
        
        .feature-box i {
            font-size: 48px;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        
        .feature-box h3 {
            margin-top: 0;
        }
        
        /* --- Steps --- */
        .steps {
            margin-top: 30px;
        }
        
        .step {
            display: flex;
            margin-bottom: 25px;
        }
        
        .step-number {
            background-color: var(--primary-color);
            color: white;
            width: 35px;
            height: 35px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            font-weight: bold;
            margin-right: 15px;
            flex-shrink: 0;
        }
        
        .step-content {
            flex: 1;
        }
        
        /* --- Info List --- */
        .info-list {
            list-style: none;
            margin-top: 20px;
        }
        
        .info-list li {
            padding: 12px 0;
            border-bottom: 1px solid #eee;
            display: flex;
            align-items: flex-start;
        }
        
        .info-list li:last-child {
            border-bottom: none;
        }
        
        .info-list i {
            color: var(--primary-color);
            margin-right: 15px;
            margin-top: 5px;
        }
        
        /* --- About Section --- */
        .team-members {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 25px;
            margin-top: 40px;
        }
        
        .member {
            text-align: center;
        }
        
        .member-image {
            width: 120px;
            height: 120px;
            border-radius: 50%;
            object-fit: cover;
            margin: 0 auto 15px;
        }
        
        .member h4 {
            margin-bottom: 5px;
            color: var(--dark-blue);
        }
        
        .member p {
            font-size: 14px;
            color: #666;
        }
        
        /* --- Footer --- */
        footer {
            background-color: var(--dark-blue);
            color: #fff;
            padding: 40px 0 20px;
        }
        
        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 30px;
        }
        
        .footer-section h3 {
            color: #fff;
            margin-top: 0;
            margin-bottom: 20px;
            font-size: 18px;
        }
        
        .footer-section ul {
            list-style: none;
        }
        
        .footer-section ul li {
            margin-bottom: 10px;
        }
        
        .footer-section a {
            color: #ddd;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-section a:hover {
            color: #fff;
            text-decoration: underline;
        }
        
        .social-links {
            display: flex;
            gap: 15px;
            margin-top: 15px;
        }
        
        .social-links a {
            color: #fff;
            font-size: 20px;
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            margin-top: 40px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #aaa;
            font-size: 14px;
        }
        
        /* --- Responsive Styles --- */
       @media (max-width: 768px) {
  .header-container {
    padding: 10px 20px;
  }

  .nav-toggle {
    display: block;
  }

  .main-nav {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background-color: #fff;
    height: 0;
    overflow: hidden;
    transition: height 0.3s;
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
  }

  .main-nav.active {
    height: auto;
    padding: 20px 0;
  }
.main-nav ul {
    flex-direction: column;
    align-items: center;
  }


  .main-nav li {
    margin: 15px 0;
  }

  .main-nav a {
    color: var(--primary-color); /* μπλε */
  }

  .main-nav a:hover {
    color: var(--secondary-color); /* ανοιχτότερο μπλε */
  }

  .main-nav a.active {
    color: var(--primary-color);
  }

  .main-nav a.active::after {
    background-color: var(--primary-color);
  }

  .hero {
    padding: 40px 0;
  }

  .hero h1 {
    font-size: 28px;
  }

  .feature-boxes {
    grid-template-columns: 1fr;
  }

  .button {
    display: block;
    width: 100%;
    text-align: center;
    margin-right: 0;
  }
}


        /* --- Tab System --- */
        .tab-container {
            margin-top: 30px;
        }

        .tabs {
            display: flex;
            flex-wrap: wrap;
            border-bottom: 1px solid #ddd;
            margin-bottom: 20px;
        }

        .tab-btn {
            padding: 10px 20px;
            background: none;
            border: none;
            cursor: pointer;
            font-size: 16px;
            font-weight: 500;
            color: #333;
            position: relative;
        }

        .tab-btn.active {
            color: var(--primary-color);
        }

        .tab-btn.active::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--primary-color);
        }

        .tab-content {
            display: none;
        }

        .tab-content.active {
            display: block;
        }

        /* --- Αρχική Σελίδα --- */
        .welcome-banner {
    background: rgba(255, 255, 255, 0.85);
    border: 1px solid #dde6f0;
    border-radius: 16px;
    padding: 50px 30px;
    margin-bottom: 50px;
    text-align: center;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
    backdrop-filter: blur(4px);
}


        .welcome-banner h2 {
    color: var(--primary-color);
    font-size: 30px;
    font-weight: 700;
    margin-bottom: 20px;
}

.welcome-banner p {
    font-size: 17px;
    color: #444;
    margin-bottom: 30px;
}

.welcome-banner .button {
    margin: 0 10px 10px;
}


        .welcome-banner h2::after {
            left: 50%;
            transform: translateX(-50%);
        }

        .quick-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 25px;
            margin-top: 40px;
        }

        .quick-link {
            background: #fff;
            border-radius: 8px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.08);
            overflow: hidden;
            transition: transform 0.3s;
        }

        .quick-link:hover {
            transform: translateY(-5px);
        }

        .quick-link-content {
            padding: 20px;
        }

        .quick-link h3 {
            margin-top: 0;
            font-size: 20px;
        }

        .quick-link p {
            margin-bottom: 20px;
            color: #666;
        }

        .btn-small {
            padding: 8px 16px;
            font-size: 14px;
        }

        /* --- Carousel --- */
        .carousel {
            position: relative;
            margin: 40px 0;
            border-radius: 10px;
            overflow: hidden;
            height: 300px;
        }

        .carousel-inner {
            position: relative;
            width: 100%;
            height: 100%;
        }

        .carousel-item {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            opacity: 0;
            transition: opacity 0.6s ease-in-out;
            background-size: cover;
            background-position: center;
        }

        .carousel-item.active {
            opacity: 1;
        }

        .carousel-caption {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 20px;
            background: linear-gradient(transparent, rgba(0,0,0,0.7));
            color: #fff;
        }

        .carousel-caption h3 {
            color: #fff;
            margin-top: 0;
        }

        .carousel-control {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            background: rgba(255,255,255,0.3);
            color: #fff;
            border: none;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            font-size: 20px;
            cursor: pointer;
            z-index: 10;
        }

        .carousel-prev {
            left: 10px;
        }

        .carousel-next {
            right: 10px;
        }

        .carousel-indicators {
            position: absolute;
            bottom: 10px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            gap: 8px;
            z-index: 10;
        }

        .carousel-indicator {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: rgba(255,255,255,0.5);
            cursor: pointer;
        }

        .carousel-indicator.active {
            background: #fff;
        }
        /* --- Modal Διόρθωση --- */
.modal {
  display: none; /* Κρύβει το modal αρχικά */
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0,0,0,0.6);
}

.modal-content {
  background-color: #fff;
  margin: 10% auto;
  padding: 30px;
  border-radius: 8px;
  width: 90%;
  max-width: 600px;
  position: relative;
  animation: fadeIn 0.3s ease-in-out;
}

.close-btn {
  position: absolute;
  top: 15px;
  right: 20px;
  font-size: 28px;
  font-weight: bold;
  color: #aaa;
  cursor: pointer;
}

.close-btn:hover {
  color: #000;
}

@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.tip-icon {
  position: fixed;
  bottom: 25px;
  right: 25px;
  background-color: #003a7a;
  color: #fff;
  font-size: 22px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  z-index: 1000;
  transition: transform 0.3s;
}

.tip-icon:hover {
  transform: scale(1.1);
}

.tip-bubble {
  position: fixed;
  bottom: 80px;
  right: 25px;
  background-color: #fff;
  color: #003a7a;
  padding: 15px 20px;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
  max-width: 280px;
  display: none;
  z-index: 999;
  font-size: 14px;
  animation: fadeIn 0.3s ease-in-out;
}

.tip-bubble .close-tip {
  position: absolute;
  top: 8px;
  right: 12px;
  background: none;
  border: none;
  color: #003a7a;
  font-size: 18px;
  cursor: pointer;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.email-popup {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  display: flex; justify-content: center; align-items: center;
  z-index: 9999;
}

.email-popup-content {
  background: #fff;
  padding: 30px;
  border-radius: 12px;
  text-align: center;
  max-width: 400px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.2);
  position: relative;
}

.email-popup input {
  padding: 10px;
  width: 90%;
  margin: 15px 0;
  border: 1px solid #ccc;
  border-radius: 6px;
}

.email-popup button {
  padding: 10px 20px;
  background-color: #003a7a;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

.email-popup .close-popup {
  position: absolute;
  top: 10px; right: 15px;
  font-size: 22px;
  cursor: pointer;
}
.feature-box img {
  width: 220px;
  height: 220px;
  object-fit: scale-down;
  display: block;
  margin: 0 auto 15px;
}