.section {
  padding: 20px;
  padding-top: calc(var(--nav-height) + 5px);
}

@media screen and (max-width: 670px) {
  .section {
    padding-top: 20px;
  }
}

.section-content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px;
}

.section-title {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-direction: column;
  width: 100%;
  max-width: 600px;
  margin-bottom: 48px;
  gap: 16px;
  opacity: 0;
}

.section-title-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-text);
  width: 100%;
}

.section-title-text {
  font-size: 1rem;
  color: var(--color-text);
  line-height: 1.5;
  width: 100%;
}

.section-subtitle {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-direction: column;
  width: 100%;
  max-width: 600px;
  margin-top: 32px;
  gap: 16px;
}

.section-subtitle-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text);
  width: 100%;
}

.section-subtitle-text {
  font-size: 1rem;
  color: var(--color-text);
  line-height: 1.5rem;
  width: 100%;
}

.section-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.project-detail .section-cards {
  grid-template-columns: 1fr;
}

@media screen and (max-width: 1024px) {
  .section-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media screen and (max-width: 670px) {
  .section-cards {
    grid-template-columns: repeat(1, 1fr);
    gap: 24px;
  }

  .section-content {
    padding: 0;
  }
}

@media screen and (max-width: 480px) {
  .section {
    padding: 10px;
    padding-top: 20px;
  }

  .section-content {
    padding: 10px;
  }

  .section-cards {
    gap: 16px;
  }
}

.section-card {
  background: var(--color-invert);
  border-radius: 16px;
  border: 1px solid rgba(149, 18, 44, 0.2);
  display: flex;
  flex-direction: column;
  position: relative;
  margin-top: 10px;
  box-shadow: 0 1px 10px rgba(149, 18, 44, 0.1);
}

.section-card:hover {
  border-color: rgba(149, 18, 44, 0.4);
  box-shadow: 0 1px 10px rgba(149, 18, 44, 0.2);
}

.section-card-date {
  background: var(--color-invert);
  border-radius: 24px;
  border: 1px solid rgba(149, 18, 44, 0.2);
  height: 28px;
  padding: 0 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  top: -14px;
  left: 18px;
}

.section-card-date-text {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.02rem;
}

.section-card-title {
  padding: 16px 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 8px;
}

.section-card-title-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.section-card-title-text-title {
  font-size: 1.1rem;
  line-height: 1.4rem;
  font-weight: 700;
  color: var(--color-secondary);
}

.section-card-title-text-text {
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.7);
}

.section-card-title-image {
  width: 52px;
  height: 52px;
  border: none;
}

.section-card-content {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 0;
}

.section-card-content-text {
  font-size: 0.95rem;
  line-height: 1.5rem;
  font-weight: 400;
  color: var(--color-text);
}

.section-chips {
  width: 100%;
  display: flex;
  gap: 12px;
  margin-top: 0;
  flex-wrap: wrap;
}

.section-margin {
  height: 48px;
  width: 5px;
}

.section-chip {
  display: flex;
  flex-direction: row;
  gap: 12px;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 18px;
  border: 1px solid rgba(149, 18, 44, 0.2);
  background-color: rgba(149, 18, 44, 0.1);
  text-decoration: none;
  color: var(--color-text);
  border-radius: 300px;
  transition: all 0.3s, color 0.1s, background-color 0.2s, border-color 0.1s;
  transition-timing-function: cubic-bezier(0.44, -0.2, 0, 1.57);
}

.section-chip-back {
  background-color: rgba(238, 69, 64, 0.3);
  transition: all 0.3s ease;
}

.section-chip-back:hover {
  background-color: rgba(238, 69, 64, 0.6);
}

.section-chip:active {
  padding: 0 18px;
  margin: 0;
}

.section-chip-icon,
.section-chip-img {
  height: 22px;
}

.section-chip-text {
  font-size: 0.95rem;
  font-weight: 500;
  user-select: none;
}

.section.skills {
  margin-bottom: 96px;
}

/* Timeline Styles */
.timeline {
  position: relative;
  max-width: 1000px;
  margin: 0 auto;
  padding: 40px 0;
}

/* Timeline central line */
.timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(
    180deg,
    var(--color-secondary),
    var(--color-tertiary)
  );
  transform: translateX(-50%);
  z-index: 1;
}

.timeline-item {
  position: relative;
  width: 100%;
  margin-bottom: 60px;
  opacity: 0;
}

.timeline-item-left .timeline-content {
  margin-right: 55%;
  text-align: right;
}

.timeline-item-right .timeline-content {
  margin-left: 55%;
  text-align: left;
}

.timeline-marker {
  position: absolute;
  left: 50%;
  top: 30px;
  width: 16px;
  height: 16px;
  background: var(--color-secondary);
  border: 3px solid var(--color-invert);
  border-radius: 50%;
  transform: translateX(-50%);
  z-index: 2;
  box-shadow: 0 0 0 4px rgba(199, 43, 64, 0.2);
}

.timeline-marker::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 6px;
  height: 6px;
  background: var(--color-tertiary);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.timeline-date {
  background: var(--color-invert);
  border-radius: 20px;
  border: 1px solid rgba(149, 18, 44, 0.3);
  height: 32px;
  padding: 0 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  box-shadow: 0 2px 8px rgba(149, 18, 44, 0.1);
}

.timeline-item-left .timeline-date {
  margin-left: auto;
}

.timeline-item-right .timeline-date {
  margin-right: auto;
}

.timeline-date-text {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-secondary);
  letter-spacing: 0.02rem;
}

.timeline-card {
  background: var(--color-invert);
  border-radius: 16px;
  border: 1px solid rgba(149, 18, 44, 0.2);
  box-shadow: 0 4px 20px rgba(149, 18, 44, 0.1);
  overflow: hidden;
  transition: all 0.3s ease;
}

.timeline-card:hover {
  border-color: rgba(149, 18, 44, 0.4);
  box-shadow: 0 6px 30px rgba(149, 18, 44, 0.2);
  transform: translateY(-2px);
}

.timeline-card-header {
  padding: 20px 24px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.timeline-card-title {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.timeline-card-title-text {
  font-size: 1.1rem;
  line-height: 1.4rem;
  font-weight: 700;
  color: var(--color-secondary);
  margin: 0;
}

.timeline-card-subtitle {
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.7);
  margin: 0;
}

.timeline-card-image {
  width: 52px;
  height: 52px;
  border-radius: 8px;
  border: none;
  flex-shrink: 0;
}

.timeline-card-content {
  padding: 0 24px 24px;
}

.timeline-card-content-text {
  font-size: 0.95rem;
  line-height: 1.6rem;
  font-weight: 400;
  color: var(--color-text);
  margin: 0;
}

/* Mobile responsiveness for timeline */
@media screen and (max-width: 768px) {
  .timeline::before {
    left: 20px;
  }

  .timeline-item-left .timeline-content,
  .timeline-item-right .timeline-content {
    margin-left: 50px;
    margin-right: 0;
    text-align: left;
  }

  .timeline-marker {
    left: 20px;
  }

  .timeline-date {
    margin-right: auto;
    margin-left: 0;
  }
}

@media screen and (max-width: 480px) {
  .timeline {
    padding: 20px 0;
  }

  .timeline-item {
    margin-bottom: 40px;
  }

  .timeline-item-left .timeline-content,
  .timeline-item-right .timeline-content {
    margin-left: 40px;
  }

  .timeline::before {
    left: 15px;
  }

  .timeline-marker {
    left: 15px;
    width: 12px;
    height: 12px;
  }

  .timeline-card-header {
    padding: 16px 20px 12px;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .timeline-card-content {
    padding: 0 20px 20px;
  }
}