:root {
  --background-color: linear-gradient(to right, #a8dadc, #457b9d); /* Light blue gradient */
  --text-color: black; /* Changed to black for better contrast on light blue */
  --container-bg-color: rgba(255, 255, 255, 0.7); /* Slightly more opaque for light mode */
  --button-bg-color: #1d3557; /* Darker button for light mode */
  --button-hover-bg-color: #214f77;
  --button-disabled-bg-color: #cccccc;
  --box-shadow-color: rgba(0, 0,0, 0.2);
}

.dark-mode {
  --background-color: linear-gradient(to right, #0a0a0a, #333333);
  --text-color: #e0e0e0;
  --container-bg-color: rgba(0, 0, 0, 0.3);
  --button-bg-color: #34495e;
  --button-hover-bg-color: #2c3e50;
  --button-disabled-bg-color: #555555;
  --box-shadow-color: rgba(255, 255, 255, 0.1);
}

body {
  font-family: 'Helvetica Neue', sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: var(--background-color);
  color: var(--text-color);
  text-align: center;
  position: relative; /* Needed for absolute positioning of the button */
}

.container {
  background-color: var(--container-bg-color);
  padding: 40px;
  border-radius: 15px;
  box-shadow: 0 10px 25px var(--box-shadow-color);
  backdrop-filter: blur(10px);
}

h1 {
  margin-bottom: 30px;
  font-size: 2.5em;
}

#generate-btn {
  padding: 15px 30px;
  font-size: 1.2em;
  cursor: pointer;
  background-color: var(--button-bg-color);
  color: white;
  border: none;
  border-radius: 8px;
  margin-bottom: 30px;
  transition: background-color 0.3s, transform 0.2s;
}

#generate-btn:hover {
    background-color: var(--button-hover-bg-color);
    transform: scale(1.05);
}

#generate-btn:disabled {
    background-color: var(--button-disabled-bg-color);
    cursor: not-allowed;
}

#numbers-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
}

.number {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.8em;
  font-weight: bold;
  color: white;
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
  animation: pop-in 0.5s ease-out forwards;
}

/* Color ranges for lotto balls */
.number[data-color="yellow"] { background-color: #f1c40f; }
.number[data-color="blue"] { background-color: #3498db; }
.number[data-color="red"] { background-color: #e74c3c; }
.number[data-color="gray"] { background-color: #95a5a6; }
.number[data-color="green"] { background-color: #2ecc71; }

@keyframes pop-in {
  0% {
    transform: scale(0);
    opacity: 0;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }
    .number {
        width: 50px;
        height: 50px;
        font-size: 1.5em;
    }
}

#theme-toggle-btn {
  position: absolute; /* Position the button */
  top: 20px; /* From the top */
  right: 20px; /* From the right */
  padding: 10px 20px;
  font-size: 1em;
  cursor: pointer;
  background-color: var(--button-bg-color);
  color: var(--text-color); /* Use text color from theme */
  border: none;
  border-radius: 5px;
  transition: background-color 0.3s, transform 0.2s, color 0.3s; /* Add color to transition */
  z-index: 100; /* Ensure button is above other content */
}

#theme-toggle-btn:hover {
    background-color: var(--button-hover-bg-color);
    transform: scale(1.05);
}

/* Navigation styles */
nav {
  margin-top: -15px; /* Adjust as needed to position it correctly */
  margin-bottom: 20px;
}

nav a {
  color: var(--text-color);
  text-decoration: none;
  font-size: 1.1em;
  padding: 8px 15px;
  border-radius: 5px;
  transition: background-color 0.3s;
}

nav a:hover {
  background-color: var(--button-hover-bg-color);
}

/* Form styles */
#contact-form {
  display: flex;
  flex-direction: column;
  gap: 15px;
  width: 100%;
  max-width: 500px;
  margin-top: 20px;
}

.form-group {
  text-align: left;
}

.form-group label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
  background-color: rgba(255, 255, 255, 0.8);
  color: #333;
}

.dark-mode .form-group input[type="text"],
.dark-mode .form-group input[type="email"],
.dark-mode .form-group textarea {
  background-color: rgba(0, 0, 0, 0.5);
  color: #eee;
  border: 1px solid #555;
}

.form-group textarea {
  resize: vertical;
}

#submit-btn {
  padding: 15px 30px;
  font-size: 1.2em;
  cursor: pointer;
  background-color: var(--button-bg-color);
  color: white;
  border: none;
  border-radius: 8px;
  margin-top: 10px;
  transition: background-color 0.3s, transform 0.2s;
}

#submit-btn:hover {
    background-color: var(--button-hover-bg-color);
    transform: scale(1.05);
}

#form-status {
  margin-top: 15px;
  font-weight: bold;
  color: green;
}