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

body, html {
  height: 100%;
  font-family: 'Inter', sans-serif;
  background: #0a0a0a;
  color: #fefefe;
  overflow: hidden;
}

.fullscreen-container {
  position: relative;
  height: 100vh;
  width: 100vw;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: linear-gradient(135deg, #111111 30%, #1f1f1f 100%);
  overflow: hidden;
}

.grid-pattern {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image:
    linear-gradient(#2a2a2a 1px, transparent 1px),
    linear-gradient(90deg, #2a2a2a 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.18;
  z-index: 0;
  pointer-events: none;
  filter: drop-shadow(0 0 4px #222);
}

.header {
  position: absolute;
  top: 40px;
  left: 40px;
  z-index: 3;
}

.logo {
  width: 140px;

}

.main-content {
  z-index: 2;
  max-width: 600px;
  text-align: center;
  user-select: none;
  padding: 0 1rem;
}

.headline {
  font-size: 3.8rem;
  font-weight: 900;
  letter-spacing: 0.08rem;
  line-height: 1.05;
  margin-bottom: 1.6rem;
  color: #fff;
  text-shadow: 0 0 15px rgba(255,255,255,0.13);
}

.description {
  font-weight: 600;
  font-size: 1.3rem;
  color: #bbb;
  margin-bottom: 3rem;
  user-select: text;
}

.footer {
  position: absolute;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  font-size: 0.87rem;
  color: #555;
  user-select: none;
  text-align: center;
  width: 100%;
}

@media(max-width: 480px) {
  .headline {
    font-size: 2.5rem;
  }
  .description {
    font-size: 1rem;
  }
}