/* 포트폴리오 전용 스타일 */
:root {
  --primary-color: #0366d6;
  --accent-color: #2ecc71;
  --dark-color: #333;
  --light-color: #f8f8f8;
  --gray-color: #666;
  --border-color: #eee;
  --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  --transition-speed: 0.3s;
}

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

body {
  font-family: 'Pretendard Variable', -apple-system, BlinkMacSystemFont, system-ui, Roboto, 'Helvetica Neue', 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--dark-color);
  background-color: var(--light-color);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

a {
  text-decoration: none;
  color: var(--primary-color);
}

/* 헤더 스타일 */
.portfolio-header {
  background-color: var(--primary-color);
  color: white;
  padding: 60px 0 30px;
  text-align: center;
}

.back-link {
  display: inline-block;
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.9em;
  margin-bottom: 20px;
  transition: color var(--transition-speed);
}

.back-link:hover {
  color: white;
}

.portfolio-name {
  font-size: 2.5em;
  margin-bottom: 10px;
  font-weight: 700;
}

.portfolio-tagline {
  font-size: 1.2em;
  margin-bottom: 20px;
  font-weight: 300;
}

.social-links {
  margin-top: 20px;
}

.social-link {
  display: inline-block;
  font-size: 1.5em;
  color: white;
  margin: 0 10px;
  transition: transform var(--transition-speed);
}

.social-link:hover {
  transform: scale(1.2);
}

/* 메인 콘텐츠 스타일 */
.portfolio-main {
  padding: 60px 0;
}

.portfolio-title {
  font-size: 2em;
  margin-bottom: 20px;
  text-align: center;
}

.portfolio-intro {
  max-width: 800px;
  margin: 0 auto 40px;
  text-align: center;
  color: var(--gray-color);
  font-size: 1.1em;
  line-height: 1.6;
}

/* 포트폴리오 그리드 */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 30px;
  margin: 40px 0;
}

.portfolio-item {
  background-color: white;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition-speed);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.portfolio-item:hover {
  transform: translateY(-10px);
}

.portfolio-thumbnail {
  height: 200px;
  position: relative;
  overflow: hidden;
}

.thumbnail-image {
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  transition: transform var(--transition-speed);
}

.portfolio-item:hover .thumbnail-image {
  transform: scale(1.05);
}

.thumbnail-fallback {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3em;
  color: rgba(255, 255, 255, 0.9);
}

.theme-color-1 { background-color: #3498db; }
.theme-color-2 { background-color: #e74c3c; }
.theme-color-3 { background-color: #2ecc71; }
.theme-color-4 { background-color: #f39c12; }
.theme-color-5 { background-color: #9b59b6; }

.portfolio-content {
  padding: 25px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.portfolio-item-title {
  font-size: 1.4em;
  margin-bottom: 15px;
  color: var(--dark-color);
}

.portfolio-item-meta {
  display: flex;
  flex-wrap: wrap;
  margin-bottom: 15px;
  font-size: 0.85em;
  color: var(--gray-color);
}

.portfolio-date {
  margin-right: 15px;
  display: flex;
  align-items: center;
}

.portfolio-date i,
.portfolio-category i {
  margin-right: 5px;
}

.portfolio-item-excerpt {
  margin-bottom: 20px;
  color: var(--gray-color);
  line-height: 1.6;
  flex: 1;
}

.portfolio-readmore {
  display: inline-block;
  padding: 10px 20px;
  background-color: var(--primary-color);
  color: white;
  border-radius: 5px;
  font-weight: 500;
  transition: background-color var(--transition-speed);
  align-self: flex-start;
}

.portfolio-readmore:hover {
  background-color: #0256b9;
}

/* 푸터 스타일 */
.portfolio-footer {
  background-color: var(--dark-color);
  color: white;
  padding: 30px 0;
  text-align: center;
  font-size: 0.9em;
}

/* 반응형 스타일 */
@media (max-width: 768px) {
  .portfolio-grid {
    grid-template-columns: 1fr;
  }
  
  .portfolio-header {
    padding: 40px 0 20px;
  }
  
  .portfolio-name {
    font-size: 2em;
  }
}