body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  padding: 0;
  background: #f4f6f9;
  color: #333;
}

body.dark {
  background: #1e1e1e;
  color: #f1f1f1;
}

header {
  background: #2b2d42;
  color: white;
  padding: 1.5rem;
  text-align: center;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

nav {
  margin-top: 1rem;
}

nav a,
#darkToggle {
  margin: 0 0.5rem;
  color: #8ecae6;
  text-decoration: none;
  font-weight: bold;
}

main {
  max-width: 900px;
  margin: auto;
  padding: 2rem;
}

section {
  margin-bottom: 2.5rem;
  background: white;
  padding: 1.5rem;
  border-radius: 10px;
  box-shadow: 0 1px 5px rgba(0,0,0,0.1);
}

body.dark section {
  background: #2b2b2b;
}

footer {
  text-align: center;
  padding: 1rem;
  background: #e0e0e0;
}

button {
  margin-top: 1rem;
  padding: 0.5rem 1rem;
  background: #219ebc;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background: #126782;
}

input {
  padding: 0.4rem;
  margin-right: 0.5rem;
  border-radius: 5px;
  border: 1px solid #ccc;
}

.hidden {
  display: none;
}

textarea.code-box {
  width: 100%;
  height: 120px;
  background: #1e1e1e;
  color: #f1f1f1;
  font-family: monospace;
  padding: 10px;
  border-radius: 5px;
  margin-top: 10px;
  border: none;
}