* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  background: #f8f8f8;
  color: var(--primary-black);
  line-height: 1.6;
  overflow-x: hidden;
}

.main-section {
  background: var(--primary-white);
  padding: 80px 20px;
  height: 100vh;
  display: flex;
  align-items: center;
}

.main-content {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.main-left {
  padding-top: 40px;
}

.main-title {
  font-size: 48px;
  font-weight: 700;
  color: var(--primary-black);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 40px;
  line-height: 1.2;
  font-family: var(--font-english);
  min-height: 180px;
}

.main-title::after {
  content: "|";
  animation: blink 0.7s infinite;
}

@keyframes blink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0;
  }
}

.main-description {
  font-size: 20px;
  line-height: 1.7;
  color: #666666;
  margin-bottom: 50px;
}

.main-right {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.expandable-item {
  border-bottom: 2px solid var(--primary-black);
}

.expandable-header {
  padding: 32px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: all 0.3s ease;
}

.expandable-header:hover {
  background: #f8f8f8;
  padding-left: 20px;
  padding-right: 20px;
  margin-left: -20px;
  margin-right: -20px;
  border-radius: 8px;
}

.expandable-left {
  display: flex;
  align-items: center;
  gap: 20px;
}

.expandable-number {
  font-size: 18px;
  font-weight: 700;
  background: var(--primary-black);
  color: var(--primary-white);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-english);
}

.expandable-title {
  font-size: 18px;
  color: var(--primary-black);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-family: var(--font-korean);
}

.expandable-icon {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-black);
  transition: transform 0.3s ease;
}

.expandable-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
  border-radius: 8px;
  margin-bottom: 8px;
}

.expandable-content.active {
  max-height: 250px;
}

.expandable-inner {
  padding: 32px 48px;
}

.expandable-inner p {
  font-size: 15px;
  line-height: 1.7;
  color: #666666;
  margin-bottom: 20px;
}

.learn-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary-black);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: opacity 0.2s ease;
  font-family: var(--font-english);
}

.learn-link:hover {
  opacity: 0.7;
}

@media (max-width: 1024px) {
  .main-content {
    grid-template-columns: 1fr;
    gap: 60px;
    text-align: left;
  }

  .main-left {
    padding-top: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 768px) {
  .main-section {
    padding: 60px 20px;
  }

  .main-content {
    gap: 40px;
  }

  .main-title {
    font-size: 28px;
    letter-spacing: 2px;
  }

  .expandable-header {
    padding: 24px 0;
  }

  .expandable-inner {
    padding: 24px 32px;
  }
}