:root {
  --bg-color: #f8f9fa;
  --nav-bg: #ffffff;
  --container-bg: #ffffff;
  --text-color: #212529;
  --text-muted: #6c757d;
  --primary-color: #0d6efd;
  --accent-color: #4CAF50;
  --accent-hover: #45a049;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  --border-color: #dee2e6;
  --ball-bg: #e9ecef;
  --ball-text: #212529;
}

[data-theme="dark"] {
  --bg-color: #121212;
  --nav-bg: #1e1e1e;
  --container-bg: #1e1e1e;
  --text-color: #f8f9fa;
  --text-muted: #adb5bd;
  --primary-color: #3d8bfd;
  --accent-color: #388E3C;
  --accent-hover: #2E7D32;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  --border-color: #333;
  --ball-bg: #2d2d2d;
  --ball-text: #f8f9fa;
}

body {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
  margin: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  transition: background-color 0.3s, color 0.3s;
}

/* Navbar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 5%;
  background-color: var(--nav-bg);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-color);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-color);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.3s;
}

.nav-links a:hover {
  color: var(--primary-color);
}

/* Layout */
.content-wrapper {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem 5%;
}

.section-container {
  margin-bottom: 4rem;
  scroll-margin-top: 5rem;
}

/* Generator Section */
.app-container {
  text-align: center;
  background-color: var(--container-bg);
  padding: 3rem 2rem;
  border-radius: 15px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
}

.subtitle {
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.lotto-numbers {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin: 2.5rem 0;
  flex-wrap: wrap;
}

#generate-btn {
  background-color: var(--accent-color);
  color: white;
  padding: 12px 30px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.1rem;
  font-weight: 600;
  transition: transform 0.2s, background-color 0.3s;
}

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

/* Text Content Sections */
.text-content h2 {
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
  border-left: 5px solid var(--primary-color);
  padding-left: 1rem;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.guide-item {
  background-color: var(--container-bg);
  padding: 1.5rem;
  border-radius: 10px;
  border: 1px solid var(--border-color);
}

.guide-item h3 {
  margin-top: 0;
  color: var(--primary-color);
}

/* Ad Inquiry Form */
.ad-inquiry {
  background-color: var(--container-bg);
  padding: 2.5rem;
  border-radius: 15px;
  border: 1px solid var(--border-color);
}

.form-group {
  margin-bottom: 1.2rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--bg-color);
  color: var(--text-color);
  box-sizing: border-box;
}

.submit-btn {
  width: 100%;
  background-color: var(--primary-color);
  color: white;
  padding: 12px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
}

/* Footer */
.site-footer {
  background-color: var(--nav-bg);
  padding: 3rem 5%;
  border-top: 1px solid var(--border-color);
  margin-top: 4rem;
  text-align: center;
}

.footer-info p {
  margin: 0.5rem 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-links {
  margin-top: 1.5rem;
}

.footer-links a {
  color: var(--primary-color);
  text-decoration: none;
  font-size: 0.85rem;
  margin: 0 0.5rem;
}

/* Theme Toggle Button */
.theme-toggle {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  padding: 6px 12px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 500;
}

/* Lotto Ball Adjustments */
lotto-ball {
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@media (max-width: 600px) {
  .navbar {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
  }
  .nav-links {
    font-size: 0.8rem;
    gap: 0.8rem;
  }
}