body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: linear-gradient(120deg, #232b4d 0%, #1a2233 100%);
  margin: 0;
  padding: 0;
  min-height: 100vh;
  position: relative;
}
header, footer {
  text-align: center;
  padding: 24px 0 12px 0;
  color: #7ecbff;
}
main {
  max-width: 950px;
  margin: 32px auto;
  background: rgba(30,40,70,0.97);
  border-radius: 18px;
  box-shadow: 0 8px 32px #7ecbff33;
  padding: 40px 32px 32px 32px;
  border: 1.5px solid #7ecbff;
}
#moon-bg {
  position: fixed;
  top: 0; left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}
.card {
  margin-bottom: 40px;
  background: rgba(255,255,255,0.22);
  border-radius: 1.2rem;
  box-shadow: 0 4px 24px #90caf933, 0 1.5px 0 #fff2;
  padding: 2rem 2.2rem 1.5rem 2.2rem;
  color: #222;
  backdrop-filter: blur(2px);
  transition: box-shadow 0.2s;
}
.card:hover {
  box-shadow: 0 8px 32px #90caf955, 0 2px 0 #fff3;
}
.card h2 {
  text-align: center;
  color: #7ecbff;
  margin-bottom: 12px;
  font-size: 1.2em;
}
.input-row {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
  justify-content: center;
  align-items: center;
}
.input-row input {
  padding: 7px 10px;
  border-radius: 6px;
  border: 1px solid #b3b3b3;
  font-size: 1em;
  background: #1a2233;
  color: #fff;
  min-width: 80px;
}
.input-row button, button {
  padding: 7px 16px;
  background: linear-gradient(90deg, #7ecbff 0%, #232b4d 100%);
  border: none;
  border-radius: 6px;
  color: #232b4d;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  box-shadow: 0 2px 8px #7ecbff33;
}
.input-row button:hover, button:hover {
  background: linear-gradient(90deg, #232b4d 0%, #7ecbff 100%);
  color: #fff;
}
canvas {
  display: block;
  margin: 0 auto 18px auto;
  background: #1a2233;
  border-radius: 8px;
  box-shadow: 0 2px 8px #7ecbff22;
}
.result {
  text-align: center;
  margin-top: 10px;
  font-size: 1.1em;
  color: #7ecbff;
  font-weight: 600;
  white-space: pre-line;
}
@media (max-width: 950px) {
  main { padding: 12px; }
  .card { padding: 10px 4px 8px 4px; }
}