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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  background: #ffffff;
  color: #1a1a1a;
  line-height: 1.6;
}

header {
  text-align: center;
  background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
  color: #1a1a1a;
  padding: 50px 20px;
  border-bottom: 1px solid #e5e5e5;
}

header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 10px;
}

@media (max-width: 640px) {
  header {
    padding: 40px 15px;
  }
  
  header h1 {
    font-size: 1.75rem;
  }
}

.logo {
  width: 80px;
  height: auto;
  margin-bottom: 10px;
}

@media (max-width: 480px) {
  .logo {
    width: 60px;
  }
}

.subtitle {
  font-size: 1.1rem;
  color: #666;
  margin-top: 12px;
  font-weight: 400;
  letter-spacing: 0.3px;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 20px;
}

@media (max-width: 640px) {
  main {
    padding: 40px 15px;
  }
}

section {
  margin-bottom: 60px;
}

@media (max-width: 640px) {
  section {
    margin-bottom: 40px;
  }
}

h2 {
  font-size: 1.8rem;
  color: #1a1a1a;
  margin-bottom: 20px;
  font-weight: 600;
  letter-spacing: -0.3px;
}

ection p {
  font-size: 1rem;
  color: #555;
  line-height: 1.8;
}

.gallery {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.gallery img {
  width: calc(33% - 11px);
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
}

.gallery img:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

/* Mobile-first responsive gallery */
@media (max-width: 768px) {
  .gallery img {
    width: calc(50% - 8px);
  }
}

@media (max-width: 480px) {
  .gallery img {
    width: 100%;
  }
}

.flow-img {
  width: 100%;
  max-width: 800px;
  display: block;
  margin: 30px auto;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

ul {
  list-style-type: none;
  padding-left: 0;
}

ul li {
  background: #f8f9fa;
  margin: 12px 0;
  padding: 14px 16px;
  border-radius: 6px;
  border-left: 3px solid #1a1a1a;
  transition: all 0.2s ease;
}

ul li:hover {
  background: #eff0f1;
  transform: translateX(4px);
}

.btn {
  display: inline-block;
  margin: 10px 10px 10px 0;
  padding: 14px 28px;
  background: #1a1a1a;
  color: white;
  text-decoration: none;
  border-radius: 8px;
  min-width: 44px;
  min-height: 44px;
  text-align: center;
  font-weight: 500;
  font-size: 1rem;
  transition: all 0.3s ease;
  border: 2px solid #1a1a1a;
}

.btn:hover {
  background: white;
  color: #1a1a1a;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
  transform: translateY(-2px);
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* Mobile button improvements */
@media (max-width: 640px) {
  .buttons {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
    margin: 0;
  }
}

footer {
  text-align: center;
  padding: 30px 20px;
  background: #f8f9fa;
  font-size: 14px;
  color: #666;
  border-top: 1px solid #e5e5e5;
  margin-top: 80px;
}

.feedback-link {
  font-size: 14px;
  margin-top: 15px;
  color: #666;
}
.feedback-link a {
  color: #1a1a1a;
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px solid #1a1a1a;
  transition: all 0.2s ease;
}
.feedback-link a:hover {
  color: #666;
}


.video-container {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
  overflow: hidden;
  max-width: 100%;
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}


.swiper {
  width: 100%;
  max-width: 280px;  /* Μικρότερο από 400px */
  height: auto;
  margin: auto;
  margin-top: 1rem;
}

.swiper-slide img {
  width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  transition: box-shadow 0.3s ease;
}

.swiper-slide img:hover {
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.16);
}



.feedback-results {
  padding: 0;
  background-color: transparent;
  border-top: none;
}
.feedback-results h2 {
  font-size: 1.8rem;
  margin-bottom: 20px;
}
.feedback-results p {
  color: #666;
  margin-bottom: 20px;
}
.feedback-results iframe {
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}


.description {
  padding: 0;
}
.description p {
  font-size: 1.05rem;
  color: #555;
  margin-bottom: 16px;
  line-height: 1.8;
}
.description a {
  color: #1a1a1a;
  font-weight: 600;
  border-bottom: 2px solid #1a1a1a;
  text-decoration: none;
  transition: all 0.2s ease;
}
.description a:hover {
  color: #666;
  border-bottom-color: #666;
}

.personal-site-section {
  text-align: center;
  margin: 40px 0;
}
.personal-site-section .btn {
  padding: 14px 28px;
  background-color: #1a1a1a;
  color: white;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
}
.personal-site-section .btn:hover {
  background-color: white;
  color: #1a1a1a;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
  transform: translateY(-2px);
}




/* Sidebar styles */
.sidebar {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 2000;
  top: 0;
  left: 0;
  background-color: #ffffff;
  box-shadow: 2px 0 8px rgba(0, 0, 0, 0.12);
  overflow-x: hidden;
  transition: 0.3s ease;
  padding-top: 80px;
}

.sidebar a {
  padding: 14px 24px;
  text-decoration: none;
  font-size: 1rem;
  color: #1a1a1a;
  display: flex;
  align-items: center;
  transition: all 0.2s ease;
  min-height: 44px;
  font-weight: 500;
}

.sidebar a:hover {
  background-color: #f8f9fa;
  color: #1a1a1a;
  padding-left: 32px;
  border-left: 3px solid #1a1a1a;
}

/* Hamburger button */
.hamburger {
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 3000;
  font-size: 24px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 8px;
  cursor: pointer;
  color: #1a1a1a;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transition: all 0.2s ease;
}

.hamburger:hover {
  background: rgba(255, 255, 255, 1);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
}

/* Optional: hide hamburger when sidebar is open (you can toggle it in JS too) */
.sidebar.open + .hamburger {
  display: none;
}

/* Responsive tip */
@media (min-width: 768px) {
  .hamburger {
    display: block;
  }
}
html {
  scroll-behavior: smooth;
}