* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: #0f1115;
  color: #fff;
  display: flex;
  flex-direction: column;
}

.ad-slot {
  width: 100%;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #1a1d24;
}

.center-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.big-button {
  display: inline-block;
  padding: 2rem 4rem;
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #ff6b6b, #ff8e53);
  border: none;
  border-radius: 1.5rem;
  text-decoration: none;
  box-shadow: 0 10px 30px rgba(255, 107, 107, 0.4);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.big-button:hover {
  transform: scale(1.05);
  box-shadow: 0 14px 40px rgba(255, 107, 107, 0.55);
}

.big-button:active {
  transform: scale(0.98);
}