:root {
  --primary: #0e4b8f;       /* βασικό χρώμα */
  --accent:  #f1b434;       /* δευτερεύον */
  --text:    #1b1b1b;
  --muted:   #6b7280;
  --bg:      #ffffff;
  --bg-alt:  #f7f7f7;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 1.5rem;
}

.site-header {
  background: var(--bg);
  border-bottom: 1px solid #eee;
}
.brand { padding: 1rem 1.5rem; }
.brand h1 {
  margin: 0 0 .25rem 0;
  font-size: 1.75rem;
  color: var(--primary);
  letter-spacing: 0.2px;
}
.subtitle { margin: 0; color: var(--muted); }

.hero {
  position: relative;
  min-height: 42vh;
  background-image: url('hero.jpg'); /* βάλε το δικό σου assets/hero.jpg */
  background-size: cover;
  background-position: center;
  display: grid;
  place-items: center;
}
.hero .overlay {
  background: linear-gradient(to bottom right, rgba(14,75,143,0.65), rgba(0,0,0,0.25));
  color: white;
  width: 100%;
  padding: 4rem 1.5rem;
  text-align: center;
}
.hero h2 { margin: 0 0 .5rem 0; font-size: clamp(1.6rem, 3vw, 2.2rem); }
.hero p  { margin: 0; opacity: 0.95; }

h3 {
  margin-top: 2rem;
  font-size: 1.35rem;
  color: var(--primary);
}
h4 {
  margin-bottom: .25rem;
  color: var(--text);
}

.year-list { list-style: none; padding-left: 0; }
.year-list > li { background: var(--bg-alt); margin-bottom: 1rem; border-radius: 10px; padding: 1rem; }
.file-list { list-style: none; padding-left: 0; margin: .5rem 0 0 0; }
.file-list li { margin: .35rem 0; }
a {
  color: var(--primary);
  text-decoration: none;
  border-bottom: 1px dashed rgba(14,75,143,0.35);
}
a:hover { text-decoration: underline; }
.site-footer {
  border-top: 1px solid #eee;
  padding: 1.25rem 1.5rem;
  color: var(--muted);
  text-align: center;
  font-size: .95rem;
}

/* Μικρές οθόνες */
@media (max-width: 640px) {
  .container { padding: 1rem; }
  .hero .overlay { padding: 3rem 1rem; }
}