body {
  font-family: 'Noto Sans KR', sans-serif;
  background-color: #f7f7f7;
  color: #222;
  margin: 0;
  padding: 0;
}

header, footer {
  background-color: #63dcf1;
  color: #fff;
  padding: 1rem 2rem;
}

header nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
}

header nav .logo {
  font-weight: 700;
  font-size: 1.5rem;
  color: #fff;
  text-decoration: none;
}

header nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
}

header nav ul li a {
  color: #fff;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
}

header nav ul li a:hover {
  color: #63dcf1;
}

main {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.project-detail {
  background-color: #fff;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.project-detail h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: #333;
}

.project-detail img {
  width: 100%;
  height: auto;
  border-radius: 12px;
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.project-detail p, .project-detail ul {
  font-size: 1.1rem;
  line-height: 1.6;
  color: #555;
  margin-bottom: 1rem;
}

.project-detail ul {
  padding-left: 1.2rem;
}

.project-detail ul li {
  margin-bottom: 0.5rem;
}

.project-detail h2 {
  font-size: 1.8rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: #444;
  border-bottom: 2px solid #63dcf1;
  padding-bottom: 0.3rem;
}

.detail-btn {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  margin-right: 1rem;
  border-radius: 24px;
  background-color: #e0e7ff;
  color: #3730a3;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(99,102,241,0.15);
  transition: background-color 0.3s, color 0.3s;
}

.detail-btn:hover {
  background-color: #6366f1;
  color: #fff;
}

footer p {
  text-align: center;
  font-size: 0.9rem;
  margin: 0;
}

@media (max-width: 768px) {
  main {
    max-width: 100%;
    padding: 0 0.5rem;
  }
  .project-detail {
    padding: 1rem 0.5rem;
    border-radius: 0;
    box-shadow: none;
  }
  .project-detail h1 {
    font-size: 1.5rem;
  }
  .project-detail h2 {
    font-size: 1.1rem;
    padding-bottom: 0.1rem;
  }
  .detail-btn {
    width: 100%;
    margin: 0.5rem 0 0 0;
    padding: 0.7rem 0;
    font-size: 1rem;
  }
  header nav, footer {
    flex-direction: column;
    padding: 1rem 0.5rem;
  }
  header nav ul {
    gap: 0.8rem;
  }
}

@media (max-width: 768px) {
  .section {
    width: 100%;
    max-width: 100%;
    margin: 1rem 0;        /* 위아래 간격 */
    padding: 1rem;         /* 내부 여백 */
    box-sizing: border-box;
  }
}

@media (max-width: 768px) {
  nav ul {
    display: flex;                 /* flexbox로 가로 정렬 */
    flex-direction: row;           /* 가로 방향 */
    gap: 1rem;                     /* 아이템 간 간격 */
    padding: 0;
    margin: 0;
    overflow-x: auto;              /* 가로 스크롤 가능하게 */
    -webkit-overflow-scrolling: touch; /* iOS에서 부드러운 스크롤 */
  }
  nav ul li {
    flex: 0 0 auto;                /* 아이템 크기 고정, 줄 바꿈 방지 */
  }
  nav ul li a {
    display: block;
    padding: 0.5rem 1rem;
    white-space: nowrap;           /* 텍스트 줄 바꿈 방지 */
  }
}

@media (max-width: 768px) {
  .project-card {
    width: 100%;           /* 카드가 화면 전체 너비를 사용 */
    max-width: 100%;
    margin-bottom: 1rem;   /* 카드 간 간격 */
    box-sizing: border-box;/* 패딩/보더 포함하여 크기 계산 */
  }
}

@media (max-width: 768px) {
  .detail-btn {
    opacity: 0 !important;
    pointer-events: none !important;
  }
  .project-card {
    cursor: pointer;
  }
}

/* 모바일에서 header 높이만큼 main 상단에 padding 추가 */
/* @media (max-width: 768px) {
  main {
    padding-top: 125px;
  }
} */