:root {
  --background-color: #f8f9fa;
  --card-background-color: #ffffff;
  --primary-color: #2c3e50;
  --secondary-color: #3498db;
  --accent-color: #e67e22;
  --text-color: #333333;
  --sub-text-color: #666666;
  --shadow-color: rgba(0, 0, 0, 0.08);
  --font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
}

body.dark-theme {
  --background-color: #1a1a1a;
  --card-background-color: #2d2d2d;
  --primary-color: #ecf0f1;
  --secondary-color: #5dade2;
  --accent-color: #f39c12;
  --text-color: #e0e0e0;
  --sub-text-color: #aaaaaa;
  --shadow-color: rgba(0, 0, 0, 0.4);
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  cursor: pointer;
  background: var(--card-background-color);
  border: 1px solid var(--secondary-color);
  color: var(--text-color);
  padding: 8px 16px;
  border-radius: 20px;
  font-weight: 600;
  transition: all 0.3s ease;
  z-index: 1000;
  box-shadow: 0 2px 4px var(--shadow-color);
}

header {
  text-align: center;
  padding: 4rem 1rem 2rem;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  margin-bottom: 2rem;
}

header h1 {
  margin: 0;
  font-size: 2.5rem;
  font-weight: 800;
}

header p {
  opacity: 0.9;
  font-size: 1.1rem;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem 4rem;
  flex: 1;
}

.benefit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.benefit-card {
  background-color: var(--card-background-color);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: 0 4px 12px var(--shadow-color);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.benefit-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 24px var(--shadow-color);
}

.card-content {
  margin-bottom: 1.5rem;
}

.benefit-card h3 {
  color: var(--secondary-color);
  margin-top: 0;
  font-size: 1.3rem;
}

.benefit-card .amount {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-color);
  margin: 0.5rem 0;
}

.benefit-card .period {
  font-size: 0.9rem;
  color: var(--accent-color);
  margin-bottom: 1rem;
  background-color: rgba(230, 126, 34, 0.1);
  padding: 4px 8px;
  border-radius: 4px;
  display: inline-block;
}

body.dark-theme .benefit-card .period {
  background-color: rgba(243, 156, 18, 0.1);
}

.benefit-card p {
  font-size: 0.95rem;
  color: var(--sub-text-color);
  margin-bottom: 0;
}

.apply-btn {
  display: block;
  text-align: center;
  background-color: var(--secondary-color);
  color: white;
  text-decoration: none;
  padding: 10px;
  border-radius: 8px;
  font-weight: 600;
  transition: background-color 0.2s ease;
}

.apply-btn:hover {
  background-color: var(--primary-color);
}

footer {
  text-align: center;
  padding: 2rem;
  font-size: 0.9rem;
  color: var(--sub-text-color);
}

@media (max-width: 600px) {
  header h1 {
    font-size: 1.8rem;
  }
  .benefit-grid {
    grid-template-columns: 1fr;
  }
}