/* = Reset & Base = */
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; font-family: 'Arial', sans-serif; color: #fff; }
body { background: #000; }

/* = Navigaatio = */
.main-nav {
  position: fixed; top: 0; width: 100%; padding: 20px 40px;
  display: flex; justify-content: space-between; align-items: center;
  background: rgba(0,0,0,0.5); z-index: 10;
}
.main-nav .logo {
  font-size: 1.5rem; font-weight: bold; letter-spacing: 2px;
}
.nav-links a {
  margin-left: 30px; font-size: 1rem; text-decoration: none; color: #fff;
  transition: color .3s;
}
.nav-links a:hover { color: #0ff; }

/* = Video Tausta ja Hero = */
.video-bg {
  position: relative; width: 100%; height: 100vh; overflow: hidden;
}
.video-bg video {
  position: absolute; top: 50%; left: 50%; min-width: 100%; min-height: 100%;
  transform: translate(-50%, -50%); object-fit: cover;
  filter: brightness(0.4) contrast(1.2);
}
.hero-overlay {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  text-align: center; padding: 0 20px;
}
.hero-overlay h1 {
  font-size: 3.5rem; letter-spacing: 4px;
  text-shadow: 0 0 20px #0ff;
}
.hero-overlay p {
  font-size: 1.3rem; margin: 20px 0;
}
.cta-button {
  padding: 1rem 2.5rem; font-size: 1.1rem;
  background: #0ff; color: #000; border: none; border-radius: 50px;
  text-decoration: none; letter-spacing: 1px;
  transition: all .3s;
}
.cta-button:hover {
  background: #0cf;
  box-shadow: 0 0 20px #0cf;
}

/* = Sisältö-osat = */
main {
  background: #080808;
  padding: 80px 20px 40px;
}
main section {
  max-width: 900px; margin: auto 0 60px; padding: 40px 0;
  border-bottom: 1px solid #222;
}
main section h2 {
  font-size: 2rem; margin-bottom: 16px;
}
main section p {
  font-size: 1rem; line-height: 1.6;
}

/* = Responsiivisuus = */
@media (max-width: 768px) {
  .hero-overlay h1 { font-size: 2.5rem; }
  .hero-overlay p { font-size: 1.1rem; }
  .nav-links a { margin-left: 20px; font-size: .9rem; }
}