:root {
  --primary-color: #007bff;
  --primary-glow: rgba(0, 123, 255, 0.5);
  --secondary-color: #6c757d;
  --background-color: #f8f9fa;
  --text-color: #333;
  --card-background: #fff;
  --card-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

body.dark-mode {
  --primary-color: #007bff;
  --primary-glow: rgba(0, 123, 255, 0.5);
  --secondary-color: #6c757d;
  --background-color: #1a1a1a;
  --text-color: #fff;
  --card-background: #2a2a2a;
  --card-shadow: 0 8px 25px rgba(255, 255, 255, 0.15);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  margin: 0;
  padding: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-image: linear-gradient(rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0.8)), url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='4' height='4' viewBox='0 0 4 4'%3E%3Cpath fill='%239C92AC' fill-opacity='0.11' d='M1 3h1v1H1V3zm2-2h1v1H3V1z'%3E%3C/path%3E%3C/svg%3E");
}

main {
  text-align: center;
}

h1 {
  color: var(--primary-color);
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.card {
  background-color: var(--card-background);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: var(--card-shadow);
  max-width: 400px;
  margin: 0 auto;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.2);
}

.numbers-container {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin: 20px 0;
}

.number {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.5rem;
  font-weight: bold;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

button {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 15px 30px;
  font-size: 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

button:hover {
  background-color: #0056b3;
  transform: translateY(-2px);
  box-shadow: 0 4px 15px var(--primary-glow);
}

.theme-switch-container {
  position: absolute;
  top: 20px;
  right: 20px;
}

#theme-switch-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 5px;
}

form {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-top: 20px;
}

form label {
  font-weight: bold;
  color: var(--text-color);
  text-align: left;
  margin-bottom: -10px;
}

form input[type="text"],
form input[type="email"],
form textarea {
  padding: 12px;
  border: 1px solid var(--secondary-color);
  border-radius: 8px;
  font-size: 1rem;
  background-color: var(--card-background);
  color: var(--text-color);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

form input[type="text"]:focus,
form input[type="email"]:focus,
form textarea:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px var(--primary-glow);
  outline: none;
}

form button[type="submit"] {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 15px 30px;
  font-size: 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

form button[type="submit"]:hover {
  background-color: #0056b3;
  transform: translateY(-2px);
  box-shadow: 0 4px 15px var(--primary-glow);
}

.partnership-link {
  margin-top: 20px;
  font-size: 1.1rem;
}

.partnership-link a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: bold;
}

.partnership-link a:hover {
  text-decoration: underline;
}