body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #cfd8dc, #b0bec5);
  color: #0d1b2a;
  background-image: url('/css/noise.png');
}

header, footer {
  backdrop-filter: blur(12px);
  background-color: rgba(240, 248, 255, 0.5);
  border-bottom: 1px solid #90caf9;
  text-align: center;
  padding: 1em;
}

.logo {
  font-size: 1.8em;
  font-family: 'Roboto Mono', monospace;
  color: #0d1b2a;
  text-shadow: 0 0 1px rgba(0,0,0,0.2);
}

nav a {
  margin: 0 1em;
  text-decoration: none;
  color: #0d47a1;
}

nav a:hover {
  color: #42a5f5;
}

main {
  padding: 2em;
}

.calculator {
  background: rgba(255, 255, 255, 0.3);
  padding: 2em;
  border-radius: 20px;
  max-width: 600px;
  margin: auto;
  box-shadow: 0 0 20px rgba(0,0,0,0.1);
}

input, select {
  width: 100%;
  margin-top: 1em;
  padding: 0.7em;
  border: 1px solid #90caf9;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.4);
  color: #0d1b2a;
}

input:focus, select:focus {
  border-color: #42a5f5;
  outline: none;
  box-shadow: 0 0 5px #42a5f5;
}

button {
  margin-top: 1.5em;
  padding: 0.9em 1.8em;
  background: #42a5f5;
  border: none;
  border-radius: 8px;
  color: white;
  font-weight: bold;
  cursor: pointer;
}

button:hover {
  background: #2196f3;
}

footer {
  position: fixed;
  bottom: 0;
  width: 100%;
  font-size: 0.9em;
}

footer a {
  color: #1565c0;
  text-decoration: none;
}

footer a:hover {
  text-shadow: 0 0 4px #90caf9;
}