/* Βασικές ρυθμίσεις & μεταβλητές */
*,*::before,*::after { box-sizing: border-box; }
html,body { margin: 0; padding: 0; }
:root{
  --bg: #0b1220;
  --panel: #0f172a;
  --panel-2: #0a1020;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --primary: #22d3ee;   /* κυανό */
  --primary-ink: #0e7490;
  --border: #1f2937;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(2,6,23,.35);
  --container: 1100px;
}
body{
  font-family: "Noto Sans", system-ui, -apple-system, Segoe UI, Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #0a1020, #060910 60%);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}
img{ max-width: 100%; height: auto; display: block; }
a{ color: inherit; text-decoration: none; }
.container{ max-width: var(--container); margin-inline: auto; padding: 0 1.25rem; }

/* Header / Nav */
.site-header{ position: sticky; top: 0; backdrop-filter: blur(10px); background: rgba(11,18,32,.6); border-bottom: 1px solid var(--border); z-index: 50; }
.nav{ display: flex; align-items: center; justify-content: space-between; min-height: 64px; gap: 1rem; }
.logo{ font-weight: 700; letter-spacing: .2px; }
.nav-links{ display: flex; align-items: center; gap: 1rem; }
.nav-links a{ color: var(--muted); padding: .5rem .75rem; border-radius: 10px; }
.nav-links a:hover, .nav-links a:focus{ color: var(--text); background: rgba(255,255,255,.07); }
.nav-toggle{ display: none; background: transparent; border: 1px solid var(--border); color: var(--text); padding: .55rem .75rem; border-radius: 10px; }

/* Buttons */
.btn{ display: inline-flex; align-items: center; gap: .5rem; padding: .75rem 1rem; border-radius: 12px; border: 1px solid var(--border); transition: transform .06s ease, background .2s, color .2s; }
.btn--primary{ background: var(--primary); color: #0b1320; border-color: transparent; font-weight: 600; }
.btn--primary:hover{ background: #67e8f9; transform: translateY(-1px); }
.btn--ghost{ background: transparent; color: var(--text); }
.btn--ghost:hover{ background: rgba(255,255,255,.07); transform: translateY(-1px); }

/* Sections */
.section{ padding: 68px 0; }
.section--alt{ background: radial-gradient(1200px 500px at 50% -150px, rgba(34,211,238,.15), transparent), linear-gradient(180deg, #0a1020, #0a0f1a); }
.section--cta{ background: linear-gradient(180deg, #0f172a, #0a1020); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

/* Hero */
.hero{ padding: 80px 0 56px; background: radial-gradient(900px 380px at 50% -120px, rgba(34,211,238,.10), transparent); }
.hero-grid{ display: grid; grid-template-columns: 280px 1fr; gap: 24px; align-items: center; }
.avatar{ width: 100%; aspect-ratio: 1/1; object-fit: cover; border-radius: 22px; border: 1px solid var(--border); box-shadow: var(--shadow); }
.hero h1{ font-size: clamp(28px, 5.5vw, 46px); line-height: 1.15; margin: 0 0 10px; }
.hero .accent{ color: var(--primary); }
.tagline{ color: var(--muted); font-size: clamp(16px, 2.5vw, 18px); margin: 0 0 18px; }
.cta{ display: flex; gap: .75rem; flex-wrap: wrap; }

/* Layout helpers */
.grid-2{ display: grid; grid-template-columns: 1.2fr .8fr; gap: 24px; }
.grid-3{ display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

/* Cards / gallery */
.card{ background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }
.card h3{ margin: 0 0 8px; }
.gallery__item{ border-radius: 14px; overflow: hidden; border: 1px solid var(--border); box-shadow: 0 6px 22px rgba(2,6,23,.28); }

/* Typography */
h1,h2,h3{ line-height: 1.2; margin: 0 0 12px; }
h2{ font-size: clamp(22px, 3.8vw, 28px); }
p{ margin: 0 0 14px; }
.bullets{ list-style: none; padding: 0; margin: 0; }
.bullets li{ margin: 0 0 10px; color: var(--muted); }
b,strong{ color: #fff; }

/* Footer */
.site-footer{ border-top: 1px solid var(--border); padding: 28px 0; background: rgba(4,7,15,.7); }
.footer-grid{ display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; }
.footer-nav{ display: flex; gap: 1rem; }

/* Responsive */
@media (max-width: 980px){
  .hero-grid{ grid-template-columns: 1fr; text-align: center; }
  .cta{ justify-content: center; }
}
@media (max-width: 860px){
  .grid-2{ grid-template-columns: 1fr; }
  .grid-3{ grid-template-columns: 1fr; }
  .nav-toggle{ display: inline-block; }
  .nav-links{ display: none; }
  .nav-links.is-open{ display: flex; flex-direction: column; position: absolute; top: 64px; right: 10px; background: var(--panel); border: 1px solid var(--border); padding: 10px; border-radius: 12px; }
}