:root {
  --primary-color: #4a90e2; /* A softer blue */
  --secondary-color: #50e3c2; /* A vibrant teal */
  --background-start: #f4f7f9;
  --background-end: #d7e5f0;
  --text-color: #333;
  --white: #fff;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --container-background: var(--white);
  --header-color: var(--primary-color);
  --intro-text-color: #555;
  --ball-text-color: var(--text-color);
  --form-border-color: #ddd;
  --form-focus-border-color: var(--primary-color);
}

.dark-mode {
  --primary-color: #50e3c2; /* A vibrant teal */
  --secondary-color: #4a90e2; /* A softer blue */
  --background-start: #2c3e50;
  --background-end: #34495e;
  --text-color: #ecf0f1;
  --container-background: #34495e;
  --header-color: var(--primary-color);
  --intro-text-color: #bdc3c7;
  --ball-text-color: #2c3e50;
  --form-border-color: #555;
  --form-focus-border-color: var(--primary-color);
}

body {
  font-family: 'Helvetica Neue', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  margin: 0;
  padding: 2rem;
  background-image: linear-gradient(to top, var(--background-start), var(--background-end));
  color: var(--text-color);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  line-height: 1.6;
  transition: background-image 0.3s ease;
}

.container {
  background: var(--container-background);
  padding: 2.5rem;
  border-radius: 15px;
  box-shadow: 0 10px 30px var(--shadow-color);
  text-align: center;
  max-width: 800px;
  width: 100%;
  transition: background-color 0.3s ease;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.theme-toggle-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-label {
  font-size: 0.9rem;
  color: var(--text-color);
  white-space: nowrap;
}

*, *::before, *::after {
  box-sizing: border-box;
}

h1 {
  color: var(--header-color);
  margin: 0;
  font-size: 2.5rem;
  font-weight: 300;
}

button {
  background-color: var(--primary-color);
  color: var(--white);
  border: none;
  padding: 1rem 2rem;
  border-radius: 50px;
  cursor: pointer;
  font-size: 1.1rem;
  font-weight: 500;
  transition: all 0.3s ease;
  margin-top: 1rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

button:hover {
  transform: translateY(-3px);
  box-shadow: 0 7px 20px rgba(0, 0, 0, 0.3);
}

#lotto-numbers {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 1.5rem;
  gap: 1rem;
}

.lotto-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  width: 100%;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-color);
}

.lotto-row:last-child {
  border-bottom: none;
}

.number-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

.lotto-row .number-group:last-child {
  margin-left: 1rem; /* Space between main numbers and bonus group */
}

.number-intro {
  font-size: 1rem;
  font-weight: 500;
  margin-right: 0.5rem;
  white-space: nowrap;
  color: var(--intro-text-color);
}

.lotto-number {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  color: var(--ball-text-color);
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.5rem;
  margin: 0.25rem;
  font-weight: 700;
  animation: pop-in 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94) backwards;
  text-shadow: 0 1px 1px rgba(0,0,0,0.1);
  box-shadow: inset 0 -3px 4px rgba(0,0,0,0.1), 0 4px 8px rgba(0,0,0,0.15);
}

.bonus-number {
  border: 3px solid var(--secondary-color);
}

/* Contact Form */
#contact-form-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--form-border-color);
}

#contact-form-section h2 {
  color: var(--header-color);
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 500px;
  margin: 0 auto;
}

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

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-color);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid var(--form-border-color);
  border-radius: 8px;
  font-size: 1rem;
  color: var(--text-color);
  background-color: var(--container-background);
  transition: border-color 0.3s ease;
}

.form-group input[type="text"]:focus,
.form-group input[type="email"]:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--form-focus-border-color);
  box-shadow: 0 0 0 3px rgba(var(--form-focus-border-color), 0.2);
}

.contact-form button[type="submit"] {
  width: auto;
  align-self: center;
  margin-top: 1.5rem;
  /* Re-use general button styles but adjust margin */
}


/* Theme Switch */
.theme-switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
}

.theme-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: .4s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: .4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--primary-color);
}

input:checked + .slider:before {
  transform: translateX(26px);
}

/* Lotto Ball Colors */
.ball-color-1 { background-image: radial-gradient(circle, #fceb8d, #f9c941); } /* Yellow */
.ball-color-2 { background-image: radial-gradient(circle, #89cff0, #4a90e2); } /* Blue */
.ball-color-3 { background-image: radial-gradient(circle, #ff9a9e, #f96268); } /* Red */
.ball-color-4 { background-image: radial-gradient(circle, #a8e6cf, #50e3c2); } /* Green */
.ball-color-5 { background-image: radial-gradient(circle, #cfd9df, #a9b7c0); } /* Gray */

@keyframes pop-in {
  from {
    transform: scale(0.5);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

@media (max-width: 768px) {
  body {
    padding: 1rem;
  }

  .container {
    padding: 1rem;
  }

  .header {
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
  }

  h1 {
    font-size: 2rem;
  }

  .lotto-row {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }

  .number-group {
    justify-content: center;
  }

  .lotto-row .number-group:last-child {
    margin-left: 0; /* Reset for mobile */
    margin-top: 1rem; /* Add vertical space */
  }

  .lotto-number {
    width: 45px;
    height: 45px;
    font-size: 1.25rem;
  }

  .contact-form {
    padding: 0;
  }

  .contact-form button[type="submit"] {
    width: 100%;
  }
}