/* Σύνδεσμος παράκαμψης για screen readers */
.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.skip-link:focus {
  position: static;
  width: auto;
  height: auto;
  background: #007bff;
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 10000;
}

/* Βασικές ρυθμίσεις */
body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background-color: #f8f9fa;
  color: #212529;
  scroll-behavior: smooth;
  font-size: 16px;
}
h1, h2, h3 {
  font-weight: bold;
}

/* Header */
header {
  background-color: #343a40;
  color: white;
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 1000;
}
nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
  justify-content: center;
}
nav a {
  color: white;
  text-decoration: none;
}
nav a:hover,
nav a:focus {
  text-decoration: underline;
}

/* Hero */
.hero-banner {
  background: url('https://via.placeholder.com/1500x500') no-repeat center/cover;
  position: relative;
  height: 60vh;
  color: #fff;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
.hero-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.5);
}
.hero-banner h1,
.hero-banner p,
.hero-banner a {
  position: relative;
  z-index: 1;
}
.slogan {
  font-size: 1.5rem;
}
.cta-button {
  display: inline-block;
  background-color: #007bff;
  color: white;
  padding: 12px 24px;
  border-radius: 5px;
  transition: background-color 0.3s;
  margin-top: 1rem;
}
.cta-button:hover,
.cta-button:focus {
  background-color: #0056b3;
}

/* Welcome & Benefits */
.welcome-section {
  background-color: white;
  padding: 2rem;
  margin-top: -2rem;
  position: relative;
  z-index: 3;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
.benefits-container {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}
.benefit-box {
  background-color: white;
  border: 1px solid #dee2e6;
  padding: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  flex: 1;
  min-width: 200px;
  text-align: center;
}
.benefit-box i {
  font-size: 2.5rem;
  color: #007bff;
  margin-bottom: 1rem;
}

/* Courses */
#courses {
  background-color: #e9ecef;
  padding: 4rem 2rem;
}
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}
.course-card {
  background-color: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  text-align: left;
}
.course-card img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  margin-bottom: 1rem;
}
.course-card strong {
  color: #007bff;
}

/* Steps */
.steps-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  padding: 2rem 0;
}
.step-box {
  background-color: #f8f9fa;
  border: 1px solid #dee2e6;
  padding: 2rem;
  border-radius: 8px;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

/* About */
#about-us {
  background-color: #e9ecef;
  padding: 4rem 2rem;
  text-align: center;
}
.about-content {
  max-width: 900px;
  margin: 0 auto;
}
.bio-text {
  text-align: left;
}

/* Contact */
#contact {
  background-color: #fff;
  padding: 4rem 2rem;
}
.contact-info {
  margin-top: 2rem;
  font-size: 1.1rem;
}
.contact-info i {
  color: #007bff;
  margin-right: 10px;
}
.contact-form {
  max-width: 600px;
  margin: 2rem auto;
  text-align: left;
  padding: 2rem;
  border: 1px solid #dee2e6;
  border-radius: 8px;
  background-color: white;
}
.form-group {
  margin-bottom: 1.5rem;
}
.form-group label {
  display: block;
  font-weight: bold;
  margin-bottom: 0.5rem;
}
.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid #495057;
  border-radius: 5px;
  font-size: 1rem;
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: #007bff;
  outline: 3px solid #80bdff;
}
.contact-form button {
  width: 100%;
  border: none;
  font-size: 1rem;
  padding: 1rem;
}

/* Poster */
.poster-container {
  text-align: center;
  padding: 2rem 0;
}
.poster-container img {
  max-width: 100%;
  height: auto;
}

/* Footer */
footer {
  background-color: #343a40;
  color: white;
  padding: 1rem;
  text-align: center;
  font-size: 0.9rem;
}

/* Responsive tweaks */
@media (max-width: 768px) {
  .hero-banner {
    height: 40vh;
  }
  .hero-banner h1 {
    font-size: 2rem;
  }
  .slogan {
    font-size: 1.2rem;
  }
}