:root {
  --color-primary: #2d3748;
  --color-secondary: #4a5568;
  --color-accent: #3182ce;
  --color-light: #718096;
  --color-border: #e2e8f0;
  --color-bg: #ffffff;
  --color-bg-subtle: #f7fafc;
}

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

body {
  font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-primary);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 60px 40px;
}

/* Header */
.header {
  margin-bottom: 50px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--color-border);
}

.header__name {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.header__title {
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--color-accent);
  margin-bottom: 20px;
}

.header__contact {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 0.9rem;
  color: var(--color-secondary);
}

.header__contact a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

.header__contact a:hover {
  color: var(--color-accent);
}

/* Section */
.section {
  margin-bottom: 45px;
}

.section__title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-light);
  margin-bottom: 20px;
}

/* Experience */
.experience {
  margin-bottom: 35px;
}

.experience:last-child {
  margin-bottom: 0;
}

.experience__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 5px;
  flex-wrap: wrap;
  gap: 10px;
}

.experience__company {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
}

.experience__period {
  font-size: 0.85rem;
  color: var(--color-light);
}

.experience__role {
  font-size: 0.95rem;
  color: var(--color-secondary);
  margin-bottom: 12px;
}

.experience__description {
  color: var(--color-secondary);
}

.experience__description ul {
  padding-left: 20px;
}

.experience__description li {
  margin-bottom: 6px;
}

/* Team Timeline */
.experience__teams {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.team-group {
  position: relative;
  padding-left: 24px;
  padding-bottom: 24px;
}

.team-group:last-child {
  padding-bottom: 0;
}

.team-group::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 0;
  width: 2px;
  background-color: var(--color-border);
}

.team-group:last-child::before {
  bottom: calc(100% - 8px);
  height: 0;
}

.team-group::after {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  width: 12px;
  height: 12px;
  background-color: var(--color-bg);
  border: 2px solid var(--color-accent);
  border-radius: 50%;
}

.team-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 10px;
  flex-wrap: wrap;
  gap: 8px;
}

.team-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-secondary);
}

.team-period {
  font-size: 0.8rem;
  color: var(--color-light);
}

/* Project Toggle */
.experience__projects {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.project {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background-color: var(--color-bg);
  transition: all 0.2s ease;
}

.project:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 8px rgba(49, 130, 206, 0.08);
}

.project[open] {
  background-color: var(--color-bg-subtle);
}

.project__title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  cursor: pointer;
  list-style: none;
  user-select: none;
  gap: 12px;
}

.project__title::-webkit-details-marker {
  display: none;
}

.project__title::before {
  content: '';
  width: 6px;
  height: 6px;
  border-right: 2px solid var(--color-light);
  border-bottom: 2px solid var(--color-light);
  transform: rotate(-45deg);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.project[open] .project__title::before {
  transform: rotate(45deg);
}

.project__name {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-primary);
  flex: 1;
}

.project__tech {
  font-size: 0.75rem;
  color: var(--color-light);
  background-color: var(--color-bg-subtle);
  padding: 3px 10px;
  border-radius: 12px;
  white-space: nowrap;
}

.project[open] .project__tech {
  background-color: var(--color-bg);
}

.project__content {
  padding: 0 16px 14px 34px;
  color: var(--color-secondary);
  animation: slideDown 0.2s ease;
}

.project__year {
  display: block;
  font-size: 0.8rem;
  color: var(--color-accent);
  font-weight: 500;
  text-align: right;
  margin-bottom: 8px;
}

.project__content ul {
  padding-left: 18px;
  margin: 0;
}

.project__content li {
  margin-bottom: 4px;
  font-size: 0.9rem;
  line-height: 1.6;
}

.project__content li:last-child {
  margin-bottom: 0;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Skills */
.skills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.skill-tag {
  padding: 6px 14px;
  background-color: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--color-secondary);
}

/* Education */
.education__item {
  margin-bottom: 15px;
}

.education__item:last-child {
  margin-bottom: 0;
}

.education__school {
  font-weight: 500;
  color: var(--color-primary);
}

.education__degree {
  font-size: 0.9rem;
  color: var(--color-secondary);
}

/* Print */
@media print {
  .container {
    padding: 30px;
    max-width: 100%;
  }

  body {
    font-size: 12px;
  }

  /* 인쇄 시 모든 프로젝트 펼침 */
  .project {
    border: none;
    background: none !important;
  }

  .project__content {
    display: block !important;
  }

  .project__title::before {
    display: none;
  }
}

/* Responsive */
@media (max-width: 600px) {
  .container {
    padding: 40px 24px;
  }

  .header__name {
    font-size: 1.8rem;
  }

  .header__contact {
    flex-direction: column;
    gap: 8px;
  }

  .experience__header {
    flex-direction: column;
    gap: 2px;
  }

  .project__title {
    flex-wrap: wrap;
    padding: 10px 14px;
  }

  .project__content {
    padding-left: 14px;
  }

  .team-group {
    padding-left: 20px;
  }

  .team-header {
    flex-direction: column;
    gap: 2px;
  }
}