:root {
  --bg-color: #f0f2f5;
  --container-bg: #fff;
  --text-color: #333;
  --h1-color: #1c1e21;
  --button-bg: #4267b2;
  --button-hover-bg: #365899;
  --button-active-bg: #29487d;
  --button-text: #fff;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --button-shadow: rgba(66, 103, 178, 0.3);
}

[data-theme="dark"] {
  --bg-color: #18191a;
  --container-bg: #242526;
  --text-color: #e4e6eb;
  --h1-color: #e4e6eb;
  --button-bg: #2d88ff;
  --button-hover-bg: #1a73e8;
  --button-active-bg: #1558b0;
  --button-text: #fff;
  --shadow-color: rgba(0, 0, 0, 0.3);
  --button-shadow: rgba(45, 136, 255, 0.3);
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  transition: background-color 0.3s, color 0.3s;
}

.container {
  background-color: var(--container-bg);
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 10px 30px var(--shadow-color);
  text-align: center;
  width: 90%;
  max-width: 400px;
  position: relative;
  transition: background-color 0.3s, box-shadow 0.3s;
}

.theme-toggle {
  position: absolute;
  top: 15px;
  right: 15px;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  padding: 5px;
  border-radius: 50%;
  transition: transform 0.2s, background-color 0.2s;
}

.theme-toggle:hover {
  transform: scale(1.1);
  background-color: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .theme-toggle:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

h1 {
  color: var(--h1-color);
  font-size: 28px;
  margin-bottom: 20px;
  transition: color 0.3s;
}

.lotto-numbers {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  margin: 30px 0;
  gap: 10px;
}

.lotto-number {
  background-color: var(--button-bg);
  color: var(--button-text);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 24px;
  font-weight: bold;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  transform: scale(0);
  animation: popIn 0.5s ease-out forwards;
  transition: background-color 0.3s;
}

#generate-btn {
  background-color: var(--button-bg);
  color: var(--button-text);
  border: none;
  padding: 15px 30px;
  font-size: 18px;
  font-weight: bold;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.3s, transform 0.2s, box-shadow 0.3s;
  box-shadow: 0 4px 10px var(--button-shadow);
}

#generate-btn:hover {
  background-color: var(--button-hover-bg);
  transform: translateY(-2px);
}

#generate-btn:active {
  background-color: var(--button-active-bg);
  transform: translateY(0);
}

.contact-section, .comments-section {
  margin-top: 40px;
  text-align: left;
}

.contact-section hr, .comments-section hr {
  border: 0;
  border-top: 1px solid var(--shadow-color);
  margin-bottom: 20px;
}

.contact-section h3 {
  font-size: 18px;
  margin-bottom: 15px;
  color: var(--h1-color);
}

.form-group {
  margin-bottom: 15px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--shadow-color);
  border-radius: 6px;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: inherit;
  box-sizing: border-box;
}

.form-group textarea {
  height: 80px;
  resize: vertical;
}

.submit-btn {
  width: 100%;
  padding: 10px;
  background-color: var(--button-bg);
  color: var(--button-text);
  border: none;
  border-radius: 6px;
  font-weight: bold;
  cursor: pointer;
  transition: opacity 0.2s;
}

.submit-btn:hover {
  opacity: 0.9;
}

@keyframes popIn {
  to {
    transform: scale(1);
  }
}