body {
  margin: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: #0f172a;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica, Arial;
}

html {
  overflow-y: scroll;
}

.main-content {
  flex: 1;
  display: flex;
  align-items: center;
  flex-direction: column;
  padding-top: 2rem;
}

.main-btn {
  font-size: 1.5em;
  padding: 1em 2em;
  border-radius: 8px;
  background: #38bdf8;
  color: #000;
  border: 1px solid #000;
  cursor: pointer;
  font-weight: 600;
  box-shadow: 0 2px 8px #0002;
  transition: background 0.2s;
  text-decoration: none;
}

.main-btn:hover {
  background: #0ea5e9;
}

.heading {
  display: inline-block;
  background: #38bdf8;
  color: #000;
  padding: 10px 20px 10px 20px;
  border-radius: 12px;
  font-size: 2.1rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  box-shadow: 0 2px 8px #0002;
  margin-bottom: 24px;
}

footer {
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
  text-align: center;
  font-size: 13px;
  color: #64748b;
  opacity: 0.7;
  user-select: none;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
  text-align: center;
}