:root{
  --navy:#12304A;
  --teal:#0F8C8C;
  --gold:#C7A55B;
  --light:#F8FAFC;
  --text:#1E293B;
  --card:#FFFFFF;
}

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

body{
  font-family:Segoe UI, Arial, sans-serif;
  color:var(--text);
  background:var(--light);
  line-height:1.6;
}

header{
  background:var(--navy);
  color:white;
}

nav{
  max-width:1200px;
  margin:auto;
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:16px 20px;
}

.logo{
  font-size:1.6rem;
  font-weight:700;
  line-height:1.2;
}

.menu{
  display:flex;
  gap:24px;
}

.menu a{
  color:white;
  text-decoration:none;
  font-weight:600;
}

.hero{
  max-width:1200px;
  margin:auto;
  padding:60px 20px;
  display:grid;
  grid-template-columns:1.2fr 1fr;
  gap:40px;
  align-items:center;
}

.hero h1{
  font-size:3rem;
  margin-bottom:10px;
}

.hero h2{
  color:#cfe3ef;
  margin-bottom:20px;
  font-weight:500;
}

.hero p{
  margin-bottom:30px;
  font-size:1.1rem;
}

.btn{
  display:inline-block;
  background:var(--teal);
  color:white;
  text-decoration:none;
  padding:14px 24px;
  border-radius:8px;
  font-weight:700;
}

.hero img{
  width:100%;
  border-radius:16px;
  box-shadow:0 10px 30px rgba(0,0,0,.25);
}

.section{
  max-width:1200px;
  margin:auto;
  padding:70px 20px;
}

.section-title{
  text-align:center;
  margin-bottom:40px;
}

.section-title h2{
  color:var(--navy);
  font-size:2rem;
}

.cards{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:24px;
}

.card{
  background:white;
  padding:25px;
  border-radius:14px;
  box-shadow:0 4px 18px rgba(0,0,0,.08);
  transition:.25s;
}

.card:hover{
  transform:translateY(-4px);
}

.card h3{
  color:var(--navy);
  margin-bottom:10px;
}

.featured{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
  gap:24px;
}

.feature{
  background:var(--navy);
  color:white;
  padding:30px;
  border-radius:14px;
}

.about{
  background:white;
  padding:40px;
  border-radius:16px;
  box-shadow:0 4px 18px rgba(0,0,0,.08);
}

.about p{
  margin-bottom:18px;
}

/* Περιεχόμενα */

.contents-list a{
  display:block;
  padding:14px 18px;
  background:white;
  border-left:5px solid var(--teal);
  border-radius:10px;
  text-decoration:none;
  color:var(--text);
  font-weight:600;
  box-shadow:0 2px 8px rgba(0,0,0,.05);
  transition:all .2s ease;
}
.contents-list{
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:12px;
}
.contents-list a:hover{
  background:#F8FAFC;
  transform:translateX(6px);
  box-shadow:0 4px 12px rgba(0,0,0,.08);
}

/* Εικόνες */

.content-image{
  max-width:180px;
  width:100%;
  border-radius:12px;
  display:block;
  margin:20px auto;
}

.device-image{
  max-width:200px;
  width:50%;
  border-radius:12px;
  display:block;
  margin:20px auto;
}

.braille-image{
  width:260px;
  height:auto;
  display:block;
  margin:20px auto;
  border-radius:12px;
}

.imagecaption{
  font-size:0.9rem;
  color:#475569;
  text-align:center;
  margin-top:-5px;
  margin-bottom:15px;
}

footer{
  background:var(--navy);
  color:white;
  text-align:center;
  padding:40px 20px;
}

footer a{
  color:#cfe3ef;
}

/* Mobile Menu */

.mobile-menu{
  display:none;
}

.mobile-menu summary{
  list-style:none;
}

.mobile-menu summary::-webkit-details-marker{
  display:none;
}

/* Οι σύνδεσμοι παραμένουν κρυφοί */

.mobile-menu a{
  display:none;
}

/* Responsive */

@media(max-width:900px){

  .hero{
    grid-template-columns:1fr;
  }

  .menu{
    display:none;
  }

  .mobile-menu{
    display:block;
    margin-top:15px;
  }

  .mobile-menu summary{
    cursor:pointer;
    background:var(--teal);
    color:white;
    padding:12px 16px;
    border-radius:8px;
    font-weight:700;
    text-align:center;
  }

  .mobile-menu[open] a{
    display:block;
    background:white;
    color:var(--navy);
    text-decoration:none;
    padding:12px 16px;
    margin-top:6px;
    border-radius:8px;
    font-weight:600;
  }

  .hero h1{
    font-size:2.2rem;
  }

}