:root {
  --day-bg: #faffff;
  --day-text: #0a1c1c;
  --night-bg: #0a1c1c;
  --night-text: #faffff;
  --blur: 0.6px;
  font-family: "Helvetica Neue", Arial, sans-serif;
  transition: background-color 0.5s ease, color 0.5s ease;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--day-bg);
  color: var(--day-text);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

body.night {
  background-color: var(--night-bg);
  color: var(--night-text);
}

.container {
  text-align: center;
  padding: 2rem;
}

h1 {
  font-size: 2.6rem;
  letter-spacing: 0.05em;
  filter: blur(var(--blur));
}

.desc {
  margin-bottom: 1rem;
  font-size: 1.2rem;
  opacity: 0.8;
}

input[type="email"] {
  padding: 0.5rem 1rem;
  border: 1px solid currentColor;
  border-radius: 6px;
  font-size: 1rem;
  width: 230px;
  background: transparent;
  color: inherit;
  transition: box-shadow 0.3s ease;
}

input[type="email"]:focus {
  outline: none;
  box-shadow: 0 0 6px currentColor;
}

button {
  padding: 0.5rem 1rem;
  border: none;
  color: inherit;
  margin: 0.5rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s ease;
}

body:not(.night) button {
  background-color: var(--day-text);
  color: var(--day-bg);
}

body.night button {
  background-color: var(--night-text);
  color: var(--night-bg);
}

button:hover {
  transform: scale(1.05);
  filter: blur(0.3px);
}

#message {
  margin-top: 1rem;
  font-size: 0.9rem;
  opacity: 0.85;
}