:root {
  --bg-color: #f0f2f5;
  --text-color: #333;
  --title-color: #1a1a1a;
  --btn-gradient: linear-gradient(135deg, #6e8efb, #a777e3);
  --toggle-bg: #fff;
  --toggle-text: #333;
}

[data-theme="dark"] {
  --bg-color: #1a1a2e;
  --text-color: #e0e0e0;
  --title-color: #ffffff;
  --btn-gradient: linear-gradient(135deg, #4e54c8, #8f94fb);
  --toggle-bg: #333;
  --toggle-text: #fff;
}

body {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, 'Helvetica Neue', 'Segoe UI', 'Apple SD Gothic Neo', 'Noto Sans KR', 'Malgun Gothic', sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  margin: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s, color 0.3s;
}

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

#theme-btn {
  padding: 8px 16px;
  border-radius: 20px;
  border: none;
  background-color: var(--toggle-bg);
  color: var(--toggle-text);
  cursor: pointer;
  font-weight: 600;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  transition: all 0.3s;
}

h1 {
  margin-bottom: 40px;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--title-color);
  text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

#generator {
  padding: 16px 32px;
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  background: var(--btn-gradient);
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

#generator:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

#generator:active {
  transform: translateY(0);
}

.comments-section {
  width: 100%;
  max-width: 800px;
  margin-top: 60px;
  padding: 0 20px;
}

.contact-section {
  margin-top: 60px;
  width: 100%;
  max-width: 400px;
  background: var(--toggle-bg);
  padding: 30px;
  border-radius: 16px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
  margin-bottom: 40px;
}

.contact-section h2 {
  text-align: center;
  margin-bottom: 25px;
  font-size: 1.5rem;
  color: var(--title-color);
}

.form-group {
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
}

.form-group label {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-color);
}

.form-group input,
.form-group textarea {
  padding: 12px;
  border-radius: 8px;
  border: 1px solid #ddd;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: inherit;
  font-size: 1rem;
}

[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group textarea {
  border-color: #444;
}

#submit-btn {
  width: 100%;
  padding: 12px;
  border-radius: 8px;
  border: none;
  background: var(--btn-gradient);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.2s;
}

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

#numbers {
  display: flex;
  gap: 15px;
  margin-top: 40px;
  min-height: 60px;
  flex-wrap: wrap;
  justify-content: center;
}

.number {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
  box-shadow: 0 4px 10px rgba(0,0,0,0.2);
  text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
  animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) both;
}

@keyframes popIn {
  from { transform: scale(0); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* Korean Lotto Ball Colors */
.n-yellow { background: radial-gradient(circle at 30% 30%, #fbc02d, #f9a825); border: 2px solid #f9a825; }
.n-blue { background: radial-gradient(circle at 30% 30%, #448aff, #2979ff); border: 2px solid #2979ff; }
.n-red { background: radial-gradient(circle at 30% 30%, #ff5252, #ff1744); border: 2px solid #ff1744; }
.n-gray { background: radial-gradient(circle at 30% 30%, #9e9e9e, #757575); border: 2px solid #757575; }
.n-green { background: radial-gradient(circle at 30% 30%, #4caf50, #388e3c); border: 2px solid #388e3c; }