body {
  font-family: Arial, sans-serif;
  background-color: #ffffff;
  color: #000000;
  line-height: 1.6;
  margin: 0;
}

a {
  color: #005aa7;
}

a:focus, a:hover {
  outline: 2px dashed #000;
}

header, nav, main, footer {
  padding: 1rem;
}

header {
  background: #003366;
  color: white;
}

nav {
  background: #f2f2f2;
}

nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  gap: 1rem;
}

nav a {
  text-decoration: none;
  color: #003366;
  font-weight: bold;
}

main {
  padding: 2rem;
}

section {
  margin-bottom: 2rem;
}

footer {
  background: #003366;
  color: white;
  text-align: center;
  padding: 1rem;
}

img {
  max-width: 100%;
  height: auto;
}
.hero {
  background-image: url('pump.jpg');
  background-size: cover;
  background-position: center;
  height: calc(100vh - 120px); /* 100% του viewport ύψους - το ύψος του header+nav */
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  text-shadow: 1px 1px 4px #000;
  overflow: hidden;
}
main#home {
  margin: 0;
  padding: 0;
  width: 100%;
  height: calc(100vh - 120px); /* Ύψος χωρίς το header */
  overflow: hidden;
}
.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 1rem;
  justify-content: center;
  padding: 2rem 0;
}

.grid-item {
  width: 350px;
  height: 350px;
  background-color: #cccccc;
  background-image: linear-gradient(45deg, #dddddd 25%, #bbbbbb 25%, #bbbbbb 50%, #dddddd 50%, #dddddd 75%, #bbbbbb 75%, #bbbbbb 100%);
  background-size: 40px 40px;
  border: 2px solid #999999;
  border-radius: 4px;
  margin: 0 auto;
}
.grid-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}