:root {
  --bg-color: #f0f2f5;
  --card-bg: #fff;
  --text-color: #000;
  --text-muted: #666;
  --btn-bg: #4a90e2;
  --btn-hover: #357abd;
  --btn-text: #fff;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --input-border: #ddd;
  --input-focus: #4a90e2;
}

[data-theme='dark'] {
  --bg-color: #121212;
  --card-bg: #1e1e1e;
  --text-color: #ffffff;
  --text-muted: #aaaaaa;
  --btn-bg: #4a90e2;
  --btn-hover: #5aa0e8;
  --btn-text: #ffffff;
  --shadow-color: rgba(0, 0, 0, 0.5);
  --input-border: #444;
  --input-focus: #5aa0e8;
}

#theme-toggle {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  background: var(--card-bg);
  border: 1px solid var(--shadow-color);
  border-radius: 50%;
  width: 45px;
  height: 45px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: 0 4px 12px var(--shadow-color);
  transition: all 0.3s ease;
  z-index: 1000;
}

#theme-toggle:hover {
  transform: scale(1.1);
  background: var(--bg-color);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  padding: 3rem 0; /* Increased padding */
  transition: background-color 0.3s ease, color 0.3s ease;
}

#disqus_thread {
  margin-top: 1rem;
}

#app {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: 0 10px 25px var(--shadow-color);
  text-align: center;
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
  width: 100%;
  max-width: 500px;
}

h1, h2 {
  margin: 0 0 0.5rem;
}

p {
  margin: 0 0 2rem;
  color: var(--text-muted);
}

#numbers-container {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.number {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--btn-bg);
  color: var(--btn-text);
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.5rem;
  font-weight: bold;
  box-shadow: 0 4px 8px var(--shadow-color);
}

#generate-btn, #submit-btn {
  background: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  padding: 1rem 2rem;
  font-size: 1rem;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: background 0.3s ease, transform 0.1s ease;
  box-shadow: 0 4px 8px var(--shadow-color);
  width: 100%;
}

#generate-btn:hover, #submit-btn:hover {
  background: var(--btn-hover);
}

#generate-btn:active, #submit-btn:active {
  transform: scale(0.98);
}

/* Contact Form Styles */
#contact-form {
  text-align: left;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: bold;
  color: var(--text-color);
}

.form-group input, .form-group textarea {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid var(--input-border);
  border-radius: 0.5rem;
  background: var(--card-bg);
  color: var(--text-color);
  font-size: 1rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  box-sizing: border-box; /* Important for padding */
}

.form-group input:focus, .form-group textarea:focus {
  outline: none;
  border-color: var(--input-focus);
  box-shadow: 0 0 0 2px var(--shadow-color);
}