:root {
  /* Σταθερές χρωμάτων (μόνο light theme) */
  --primary-500: #2AB9C0;
  --primary-700: #14777E;
  --primary-900: #06373F;
  --accent-gold: #FFD479;
  --neutral-050: #FFFFFF;
  --neutral-100: #F4F7F8;
  --neutral-400: #C2CCD2;
  --neutral-700: #4A5A66;
  --neutral-800: #2E3943;
  --neutral-900: #181818;
  --danger: #F95F62;
  --success: #46C48A;
}

*,*::before,*::after{box-sizing:border-box;}
body{
  margin:0;
  font-family:'Source Sans 3',sans-serif;
  background:var(--neutral-100);
  color:var(--neutral-900);
  line-height:1.7;
}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;border-radius:6px;}
h1,h2,h3,h4,h5,h6{
  font-family:'Manrope',sans-serif;
  margin:0 0 .6rem 0;
  line-height:1.3;
}

/* ===== Top Navigation ===== */
header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--primary-500);
  color: var(--neutral-050);
  padding: .8rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background-color 0.3s ease, box-shadow 0.3s ease, backdrop-filter 0.3s ease;
  backdrop-filter: blur(0px);
}

header.scrolled {
  background-color: rgba(255, 255, 255, 0.9);
  color: var(--neutral-900);
  backdrop-filter: blur(12px);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

header.scrolled .logo {
  color: var(--primary-700);
}
.logo {
  font-size: 1.6rem;
  font-weight: 700;
  font-family: 'Courier New', Courier, monospace;
  width: 160px;
  min-width: 160px;
  white-space: nowrap;
  overflow: hidden;
}
nav {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 2rem;
  font-weight: 600;
  font-family: 'Manrope', sans-serif;
  z-index: 1;
}

nav a {
  transition: color 0.3s ease, opacity 0.3s ease;
}

nav a:hover {
  opacity: 0.8;
}

/* ===== Hero Section ===== */
.hero{
  padding:4rem 1rem 5rem;
  text-align:center;
  background:linear-gradient(180deg,var(--primary-500) 0%,var(--primary-700) 80%);
  color:var(--neutral-050);
}
.hero h1{font-size:2.8rem;font-weight:700;margin-bottom:1rem;}
.hero p{max-width:650px;margin:0 auto 2rem;font-size:1.2rem;opacity:.9;}
.btn-primary{
  background:var(--accent-gold);
  color:var(--neutral-900);
  padding:1rem 2.2rem;
  font-family:'Manrope',sans-serif;
  font-weight:600;
  border:none;
  border-radius:10px;
  cursor:pointer;
  transition:transform .15s ease,box-shadow .15s ease;
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 12px rgba(0,0,0,.1);}

/* ===== Apps Showcase ===== */
.apps-section{
  padding:4rem 1rem;
  max-width:1100px;
  margin:auto;
}
.apps-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
  gap:2rem;
}
.app-card{
  background:var(--neutral-050);
  border-radius:12px;
  overflow:hidden;
  box-shadow:0 4px 12px rgba(0,0,0,.05);
  display:flex;
  flex-direction:column;
  height:100%;
}
.app-card img{height:160px;object-fit:cover;}
.app-card-content{padding:1.4rem;flex:1;display:flex;flex-direction:column;}
.app-card h3{color:var(--primary-700);font-size:1.3rem;}
.app-card p{flex:1;color:var(--neutral-700);}
.badge{
  align-self:flex-start;
  background:var(--success);
  color:var(--neutral-050);
  padding:.25rem .6rem;
  font-size:.75rem;
  border-radius:4px;
  font-family:'Manrope',sans-serif;
  margin-top:.5rem;
}

/* ===== Features Section ===== */
.features{
  background:var(--neutral-050);
  padding:4rem 1rem 5rem;
}
.features-inner{max-width:1100px;margin:auto;text-align:center;}
.feature-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:2rem;margin-top:3rem;}
.feature-item{
  background:var(--neutral-100);
  padding:2rem;
  border-radius:10px;
  box-shadow:0 4px 12px rgba(0,0,0,.04);
}
.feature-item h3{color:var(--primary-700);font-size:1.2rem;margin-bottom:.5rem;}
.icon-circle{
  width:56px;height:56px;
  border-radius:50%;
  background:var(--primary-500);
  display:flex;align-items:center;justify-content:center;
  margin:0 auto 1rem;
  font-size:1.5rem;color:var(--neutral-050);
}

/* ===== CTA ===== */
.cta{
  background:var(--primary-900);
  color:var(--neutral-050);
  text-align:center;
  padding:3rem 1rem;
}
.cta h2{font-size:2rem;margin-bottom:1rem;}

/* ===== Footer ===== */
footer{
  text-align:center;
  padding:2rem 1rem;
  color:var(--neutral-700);
  font-size:.9rem;
}

@media(min-width:768px){
  .hero h1{font-size:3.2rem;}
}
.cursor {
  display: inline-block;
  background: none;
  color: var(--neutral-050);
  font-weight: bold;
  animation: blink 1s infinite;
}

@keyframes blink {
  0%, 50%, 100% { opacity: 1; }
  25%, 75% { opacity: 0; }
}

#back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background-color: #FFD479;
  color: #181818;
  border: none;
  border-radius: 50%;
  width: 48px;
  height: 48px;
  font-size: 1.5rem;
  font-weight: bold;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  z-index: 999;
}

#back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#back-to-top:hover {
  transform: translateY(-3px);
}
#back-to-top:active {
  transform: scale(0.95);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
}

@media (max-width: 768px) {
  header {
    flex-wrap: wrap;
    justify-content: center;
    padding: 1rem;
  }

  .logo {
    position: static;
    margin-bottom: 0.5rem;
    text-align: center;
  }

  nav {
    position: static;
    transform: none;
    flex-wrap: wrap;
    gap: 1.2rem;
    justify-content: center;
    margin-bottom: 0.5rem;
  }

  .hero h1 {
    font-size: 2rem;
    line-height: 1.3;
  }

  .hero p {
    font-size: 1rem;
    padding: 0 1rem;
  }

  .btn-primary {
    width: 90%;
    max-width: 300px;
  }

  .apps-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .app-card img {
    height: auto;
  }

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

  .features-inner h2 {
    font-size: 1.5rem;
  }

  .cta h2 {
    font-size: 1.5rem;
  }

  .cta p {
    padding: 0 1rem;
  }

  footer {
    padding: 1.5rem 1rem;
    font-size: 0.8rem;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  nav {
    gap: 0.8rem;
    font-size: 0.95rem;
  }

  .hero h1 {
    font-size: 1.6rem;
  }

  .hero p {
    font-size: 0.95rem;
  }
}
.contact-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  margin-top: 2rem;
  color: white;
  font-size: 1.1rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: 'Manrope', sans-serif;
}

.contact-item i {
  font-size: 1.4rem;
  color: var(--accent-gold);
}

/* ===== Partners (Logos) ===== */
.partners {
  background: var(--primary-900);        /* ίδιο με το contact */
  color: var(--neutral-050);
  padding: 3.5rem 1rem;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.partners-inner {
  max-width: 1100px;
  margin: 0 auto;
}
.partners h2 {
  text-align: center;
  font-family: 'Manrope', sans-serif;
  font-size: 1.8rem;
  color: var(--neutral-050);              /* λευκός τίτλος */
  margin: 0 0 1.75rem 0;
}

/* Carousel wrapper with edge-fade for polish */
.logo-carousel {
  position: relative;
  overflow: hidden;
  padding: 1rem 0;
  /* διακριτικό fade στις άκρες (δουλεύει και σε dark) */
  -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 5%, #000 95%, transparent 100%);
  mask-image: linear-gradient(90deg, transparent 0, #000 5%, #000 95%, transparent 100%);
}

.logo-track {
  display: flex;
  align-items: center;
  gap: clamp(2rem, 5vw, 4rem);
  width: max-content;
  animation: partners-scroll 30s linear infinite;
}
.logo-track:hover { animation-play-state: paused; }

/* Λογότυπα: καθαρό λευκό σε dark background για ομοιομορφία */
.partner-logo {
  height: clamp(28px, 5vw, 44px);
  width: auto;
  filter: brightness(0) invert(1) grayscale(100%);  /* “βάφει” λευκό */
  opacity: 0.9;
  transition: transform .2s ease, filter .2s ease, opacity .2s ease;
  user-select: none;
  -webkit-user-drag: none;
  /* ελαφρύ glow για ευκρίνεια σε πολύ σκούρα σημεία */
  filter: brightness(0) invert(1) grayscale(100%) drop-shadow(0 0 1px rgba(255,255,255,0.25));
}
.partner-logo:hover {
  /* στο hover εμφανίζεται το αυθεντικό (έγχρωμο) λογότυπο */
  filter: none;
  opacity: 1;
  transform: translateY(-2px);
}

@keyframes partners-scroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); } /* λειτουργεί γιατί διπλασιάσαμε τη σειρά λογοτύπων */
}

/* Static grid fallback (εμφανίζεται μόνο με reduced motion) */
.logo-grid {
  display: none;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1.5rem clamp(1rem, 3vw, 2.5rem);
  align-items: center;
  justify-items: center;
  margin-top: 1rem;
}

/* Respect reduced motion: σταματά η κίνηση και δείχνουμε grid */
@media (prefers-reduced-motion: reduce) {
  .logo-track { animation: none; }
  .logo-carousel { display: none; }
  .logo-grid { display: grid; }
}

@media (max-width: 768px) {
  .partners { padding: 2.5rem 1rem; }
  .partners h2 { font-size: 1.5rem; }
}