:root {
  --background-color: #f2f2f2;
  --text-color: #333;
  --header-background: #1a1a1a;
  --header-text: white;
  --nav-background: #333;
  --nav-text: white;
  --card-background: white;
  --button-background: #ffcc00;
  --button-text: #333;
  --footer-background: #111;
  --footer-text: white;
  --input-background: #fff;
  --input-text: #333;
  --input-border: #ccc;
}

body.dark-mode {
  --background-color: #121212;
  --text-color: #f2f2f2;
  --header-background: #1a1a1a;
  --header-text: white;
  --nav-background: #333;
  --nav-text: white;
  --card-background: #1e1e1e;
  --button-background: #ffcc00;
  --button-text: #333;
  --footer-background: #1e1e1e;
  --footer-text: #f2f2f2;
  --input-background: #333;
  --input-text: #f2f2f2;
  --input-border: #555;
}

body{
  font-family:Arial;
  margin:0;
  background: var(--background-color);
  color: var(--text-color);
  text-align:center;
  transition: background-color 0.3s, color 0.3s;
}

header{
  background: var(--header-background);
  color: var(--header-text);
  padding:20px;
  font-size:24px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

nav{
  background: var(--nav-background);
  padding:10px;
}

av a{
  color: var(--nav-text);
  margin:10px;
  text-decoration:none;
  transition: color 0.3s;
}

nav a:hover {
  color: #ffcc00;
}

.container{
  padding:40px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

button{
  padding:15px 25px;
  font-size:18px;
  background: var(--button-background);
  color: var(--button-text);
  border:none;
  border-radius:8px;
  cursor:pointer;
  margin-top: 10px;
  transition: transform 0.2s, box-shadow 0.2s;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.results{
  margin-top:30px;
  font-size:22px;
  line-height:2;
  animation: fadeIn 1s;
}

.card{
  background: var(--card-background);
  padding:20px;
  margin:20px auto;
  width:300px;
  border-radius:10px;
  box-shadow:0 5px 15px rgba(0,0,0,0.1);
  transition: box-shadow 0.3s, transform 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.ad{
  margin:40px;
  padding:30px;
  background:#ddd;
  width: 100%;
  max-width: 728px;
  box-sizing: border-box;
}

footer{
  background: var(--footer-background);
  color: var(--footer-text);
  padding:20px;
  margin-top:60px;
}

form label {
  display: block;
  margin-bottom: 5px;
  text-align: left;
}

form input, form textarea {
  width: 100%;
  padding: 10px;
  margin-bottom: 10px;
  border-radius: 5px;
  border: 1px solid var(--input-border);
  background-color: var(--input-background);
  color: var(--input-text);
  box-sizing: border-box;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}