:root {
  --primary: #00e5ff;
  --secondary: #bc13fe;
  --text: #e6f1ff;
  --glass: rgba(17, 34, 64, 0.65);
  --glass-border: rgba(100, 255, 218, 0.15);
  --glass-hover: rgba(23, 42, 69, 0.85);
  --text-muted-1: #a8b2d1;
  --text-muted-2: #8892b0;
  --container-width: 1200px;
  --radius-thin: 2px;
  --radius-round: 10px;
  --radius-md: 14px;
  --radius-lg-icon: 18px;
  --radius-lg: 28px;
  --radius-pill: 100px;
  --blur-xs: 5px;
  --blur-sm: 10px;
  --blur-md: 12px;
  --blur-lg: 15px;
  --transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
  --transition-fast: 0.3s;
  --transition-med: 0.35s;
  --z-behind: -2;
  --z-grid: -1;
  --z-nav: 1000;
}

*, *::before, *::after {
  box-sizing: border-box;
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--primary) #020c1b;
}

body {
  background: linear-gradient(135deg, #020c1b 0%, #0a192f 50%, #0d1e38 100%);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  overflow-x: hidden;
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

[id] {
  scroll-margin-top: 110px;
}

@media (prefers-reduced-motion: no-preference) {
  :has(:target) {
    scroll-behavior: smooth;
  }
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(0, 229, 255, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 75% 20%, rgba(188, 19, 254, 0.05) 0%, transparent 35%),
    radial-gradient(circle at 40% 80%, rgba(0, 229, 255, 0.06) 0%, transparent 45%),
    radial-gradient(circle at 85% 90%, rgba(0, 180, 216, 0.07) 0%, transparent 30%);
  filter: blur(30px);
  z-index: var(--z-behind);
  pointer-events: none;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(rgba(0, 229, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: var(--z-grid);
  pointer-events: none;
  animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
  0% { transform: translateY(0); }
  100% { transform: translateY(40px); }
}

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: #020c1b; }
::-webkit-scrollbar-thumb {
  background: linear-gradient(to bottom, var(--primary), var(--secondary));
  border-radius: var(--radius-round);
}
::-webkit-scrollbar-thumb:hover { background: var(--primary); }

.section-title {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 40px;
  font-family: 'Space Grotesk', sans-serif;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text);
  text-shadow: 0 0 10px rgba(0, 229, 255, 0.3);
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 20px 80px;
}

.separator {
  margin: 20px 0;
  opacity: 0.2;
}

/* ---------- Page transitions ----------
   1) Το nav μένει ακίνητο ανάμεσα στις σελίδες
   2) Η παλιά σελίδα φεύγει προς τα πάνω (fade + blur)
   3) Το νέο περιεχόμενο ανεβαίνει από κάτω και "καθαρίζει" από το blur */

main.container {
  animation: pageEnter 0.65s 0.1s cubic-bezier(0.23, 1, 0.32, 1) forwards;
  opacity: 0;
  transform: translateY(28px);
  filter: blur(6px);
}

@keyframes pageEnter {
  to { opacity: 1; transform: none; filter: none; }
}

@view-transition {
  navigation: auto;
}

nav { view-transition-name: site-nav; }

::view-transition-old(root) {
  z-index: 2;
  mix-blend-mode: normal;
  animation: pageExit 0.28s cubic-bezier(0.4, 0, 1, 1) both;
}

::view-transition-new(root) {
  mix-blend-mode: normal;
  animation: none;
}

@keyframes pageExit {
  to { opacity: 0; transform: translateY(-14px); filter: blur(4px); }
}

::view-transition-group(site-nav) {
  animation-duration: 0.3s;
}

@media (prefers-reduced-motion: reduce) {
  ::view-transition-group(*),
  ::view-transition-old(*),
  ::view-transition-new(*) { animation: none !important; }
  main.container { animation: none; opacity: 1; transform: none; filter: none; }
}

nav {
  position: sticky;
  top: 0;
  width: 100%;
  padding: 20px 40px;
  background: transparent;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: var(--z-nav);
  margin-bottom: 60px;
  backdrop-filter: blur(var(--blur-xs));
  -webkit-backdrop-filter: blur(var(--blur-xs));
}

nav ul {
  margin: 0;
  padding: 0;
  display: flex;
  list-style: none;
  gap: 20px;
  align-items: center;
}

nav a {
  text-decoration: none;
  color: var(--text-muted-1);
  font-size: 0.95rem;
  font-weight: 700;
  padding: 10px 24px;
  border-radius: var(--radius-pill);
  transition: var(--transition);
  letter-spacing: 1.5px;
  display: inline-block;
}

nav a:hover {
  color: #ffffff;
}

nav a.active {
  background: linear-gradient(90deg, #71cbf4, #6af098);
  color: #020c1b;
  box-shadow: 0 4px 15px rgba(106, 240, 152, 0.3);
}

.nav-actions { display: flex; align-items: center; gap: 14px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 38px;
  height: 38px;
  background: transparent;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-round);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: var(--radius-thin);
  transition: var(--transition);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.profile-card {
  text-align: center;
  margin-bottom: 60px;
}

.profile-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 30px;
}

.profile-avatar {
  width: 120px;
  height: 120px;
  padding: 10px;
  border: 2px solid var(--primary);
  border-radius: var(--radius-lg-icon);
  background: var(--glass);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.2), inset 0 0 15px rgba(0, 229, 255, 0.1);
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-12px); box-shadow: 0 15px 25px rgba(0, 229, 255, 0.3), inset 0 0 15px rgba(0, 229, 255, 0.1); }
  100% { transform: translateY(0px); }
}

.profile-details h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 3.5rem;
  margin: 0;
  background: linear-gradient(90deg, #ffffff, var(--primary), #ffffff);
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: shine 4s linear infinite;
}

@keyframes shine {
  to { background-position: 200% center; }
}

.profile-details .subtitle {
  color: var(--text-muted-1);
  font-size: 1.1rem;
  margin-top: 5px;
}

.profile-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 30px;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-number {
  font-size: 2.2rem;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: bold;
  color: var(--primary);
  text-shadow: 0 0 8px rgba(0, 229, 255, 0.4);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted-2);
  letter-spacing: 1px;
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 25px;
  margin-bottom: 80px;
}

.bento-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 30px;
  backdrop-filter: blur(var(--blur-sm));
  -webkit-backdrop-filter: blur(var(--blur-sm));
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.bento-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(800px circle at var(--mouse-x) var(--mouse-y), rgba(255, 255, 255, 0.06), transparent 40%);
  opacity: 0;
  transition: opacity 0.5s;
  pointer-events: none;
}

.bento-card:hover::before { opacity: 1; }

.bento-card:hover {
  background: var(--glass-hover);
  border-color: rgba(0, 229, 255, 0.4);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4), inset 0 0 20px rgba(0, 229, 255, 0.05);
}

.card-icon {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 15px;
  filter: drop-shadow(0 0 5px rgba(0, 229, 255, 0.5));
}

.bento-card h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.5rem;
  margin-bottom: 15px;
}

.bento-card p {
  color: var(--text-muted-1);
  line-height: 1.6;
}

.fav-project-item {
  background: rgba(2, 12, 27, 0.5);
  padding: 15px;
  border-radius: var(--radius-md);
  margin-bottom: 15px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: var(--transition-fast);
}

.fav-project-item:hover {
  border-color: rgba(0, 229, 255, 0.3);
  background: rgba(17, 34, 64, 0.8);
  transform: translateX(5px);
}

.fav-project-item h4 {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1.1rem;
  margin: 0 0 8px 0;
}

.tag {
  font-size: 0.7rem;
  padding: 3px 8px;
  background: rgba(0, 229, 255, 0.1);
  color: var(--primary);
  border: 1px solid rgba(0, 229, 255, 0.3);
  border-radius: var(--radius-pill);
  font-weight: bold;
}

.project-search-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 480px;
  margin: 0 auto 30px;
  padding: 14px 22px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  backdrop-filter: blur(var(--blur-xs));
  transition: var(--transition);
}

.project-search-wrapper:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.2);
}

.project-search-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
}

.filter-container {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  color: var(--text-muted-1);
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.9rem;
  transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  background: rgba(0, 229, 255, 0.15);
  color: var(--primary);
  border-color: var(--primary);
  box-shadow: 0 0 10px rgba(0, 229, 255, 0.2);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
  margin-bottom: 50px;
}

.project-card {
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 30px;
  height: 380px;
  position: relative;
  transition: var(--transition);
  backdrop-filter: blur(var(--blur-sm));
  overflow: hidden;
}

.project-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  height: 3px;
  width: 0%;
  background: var(--primary);
  transition: var(--transition);
}

.project-card:hover {
  transform: translateY(-8px);
  background: var(--glass-hover);
  border-color: rgba(0, 229, 255, 0.3);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.5);
}

.project-card:hover::after {
  width: 100%;
  box-shadow: 0 -5px 15px rgba(0, 229, 255, 0.4);
}

.project-icon-wrapper img {
  width: 55px;
  height: 55px;
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  object-fit: cover;
  background: var(--glass-border);
}

.project-info {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.project-info h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.5rem;
  color: var(--text);
  margin: 0 0 12px 0;
}

.project-info p {
  color: var(--text-muted-1);
  font-size: 0.95rem;
  line-height: 1.6;
  margin: 0 0 20px 0;
}

.title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.title-row h3 { margin: 0; }

.badge-upcoming {
  background: var(--secondary);
  color: #fff;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}

.contact-card {
  max-width: 700px;
  margin: 0 auto;
  padding: 45px;
  border-radius: var(--radius-lg);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--blur-md));
  text-align: center;
}

.input-group {
  display: flex;
  flex-direction: column;
  margin-bottom: 22px;
  text-align: left;
}

.input-group input,
.input-group textarea {
  width: 100%;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background: rgba(2, 12, 27, 0.5);
  color: var(--text);
  font-family: inherit;
  transition: var(--transition-fast);
}

.input-group input:focus,
.input-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: rgba(17, 34, 64, 0.8);
  box-shadow: 0 0 15px rgba(0, 229, 255, 0.1);
}

.submit-btn {
  width: 100%;
  padding: 16px;
  border: none;
  border-radius: var(--radius-md);
  background: var(--primary);
  color: #020c1b;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition-med);
}

.submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(0, 229, 255, 0.4);
  background: #fff;
}

.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  display: flex;
  align-items: center;
  gap: 14px;
  max-width: 360px;
  padding: 16px 22px;
  border-radius: var(--radius-md);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--blur-md));
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(20px);
  transition: var(--transition);
  z-index: 9999;
}

.toast.show {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.toast i {
  font-size: 1.4rem;
}

.toast.success i { color: #6af098; }
.toast.error i { color: #ff4d6d; }

.toast p {
  margin: 0;
}

.toast p:first-child {
  font-weight: 700;
  margin-bottom: 2px;
}

.modern-footer {
  border-top: 1px solid var(--glass-border);
  background: rgba(2, 12, 27, 0.8);
  backdrop-filter: blur(var(--blur-md));
  padding: 60px 20px 20px;
  margin-top: auto;
  margin-bottom: 0;
  text-align: center;
}

.footer-container {
  max-width: var(--container-width);
  margin: 0 auto 30px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.footer-brand {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.8rem;
  color: var(--primary);
  margin: 0 0 10px 0;
}

.footer-desc {
  color: var(--text-muted-2);
  max-width: 400px;
  line-height: 1.6;
}

.social-group {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.social-group a {
  color: var(--text-muted-1);
  font-size: 1.5rem;
  transition: var(--transition);
}

.social-group a:hover {
  color: var(--primary);
  transform: translateY(-3px);
}

.footer-copyright {
  text-align: center;
  color: var(--text-muted-2);
  font-size: 0.85rem;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

#scrollTopBtn {
  position: fixed;
  right: 30px;
  bottom: 30px;
  width: 58px;
  height: 58px;
  border: none;
  border-radius: 50%;
  background: var(--primary);
  color: #020c1b;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(.9);
  transition: var(--transition);
  z-index: 9999;
  box-shadow: 0 5px 15px rgba(0, 229, 255, 0.3);
}

#scrollTopBtn.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

@media (max-width: 860px) {
  nav { flex-wrap: wrap; padding: 15px 20px; }
  nav ul {
    order: 3;
    width: 100%;
    flex-direction: column;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: var(--transition);
  }
  nav ul.nav-open {
    max-height: 420px;
    opacity: 1;
    margin-top: 16px;
  }
  .nav-toggle { display: flex; }
}

@media (max-width: 600px) {
  .profile-details h1 { font-size: 2.2rem; }
  .bento-grid, .projects-grid { grid-template-columns: 1fr; }
  .contact-card { padding: 30px 20px; }
  .toast { left: 20px; right: 20px; max-width: none; transform: translateY(20px); }
  .toast.show { transform: translateY(0); }
}

@media (max-width: 900px) {
  .projects-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}

/* Card Button Layout and Styling */
.project-card {
  height: auto; /* Adjust height dynamically to account for buttons */
}

.card-buttons {
  display: flex;
  gap: 10px;
  margin-top: 15px;
}

.card-btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 12px;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-pill);
  transition: var(--transition-fast);
  font-family: 'Space Grotesk', sans-serif;
}

.card-btn.primary-btn {
  background: var(--primary);
  color: #020c1b;
}

.card-btn.primary-btn:hover {
  background: #ffffff;
  box-shadow: 0 0 10px rgba(0, 229, 255, 0.4);
}

.card-btn.secondary-btn {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  border: 1px solid var(--glass-border);
}

.card-btn.secondary-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
}

.card-btn.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}