* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Pretendard', sans-serif;
}

body {
  background-color: #f4f9ff;
  color: #1a1a1a;
  transition: background-color 0.3s, color 0.3s;
}

body.dark {
  background-color: #1a1a1a;
  color: #f4f9ff;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px;
  background-color: #ffffff;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
}

body.dark header {
  background-color: #2a2a2a;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 15px;
}

.logo {
  height: clamp(80px, 6vw, 80px);
}

nav {
  display: flex;
  gap: 15px;
}

nav a {
  padding: 8px 16px;
  background-color: #e6f0ff;
  border-radius: 6px;
  color: #1e60c5;
  font-weight: bold;
  text-decoration: none;
  transition: background-color 0.3s, color 0.3s, transform 0.2s;
}

nav a:hover {
  background-color: #d0e3ff;
  transform: translateY(-2px);
}

body.dark nav a {
  background-color: #3a3a3a;
  color: #ffffff;
}

body.dark nav a:hover {
  background-color: #555;
}

#darkToggle {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  transition: transform 0.2s;
}

#darkToggle:hover {
  transform: rotate(15deg);
}

.intro {
  position: relative;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.intro-text {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  padding: 20px;
  text-align: center;
}

.intro h2 {
  font-size: clamp(3rem, 7vw, 5rem);
  margin-bottom: 20px;
}

.intro p {
  font-size: clamp(1rem, 2vw, 1.5rem);
  line-height: 1.6;
  white-space: nowrap;
}

.no-dark h2,
.no-dark p {
  color: white !important;
}

.intro-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)),
    url('../img/back.png') center/cover no-repeat;
  z-index: 1;
}

body.dark .intro-bg {
  opacity: 0.3;
}

/* 애니메이션 */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade {
  animation: fadeIn 1s ease-in-out both;
}

.animate-fade.delay {
  animation-delay: 0.5s;
}

.animate-slide {
  animation: slideUp 1s ease-in-out both;
}

.animate-fade-bg {
  animation: fadeIn 2s ease-out both;
}

/* Information 섹션 */
.info {
  margin-top: 80px;
  padding: 60px 20px;
  text-align: center;
}

.info h3 {
  font-size: 3.5rem;
  margin-bottom: 10px;
}

.info-desc {
  font-size: 1.1rem;
  margin-bottom: 40px;
  color: #555;
}

.stats {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 50px;
}

.stat {
  text-align: center;
}

.stat .count {
  font-size: 3rem;
  color: #1e60c5;
  display: block;
}

.stat p {
  font-size: 1rem;
  margin-top: 5px;
}

/* 구성원 프리뷰 */
.member-preview {
  margin-top: 100px;
  padding: 20px;
  text-align: center;
}

.member-preview h3 {
  font-size: 3.5rem;
  margin-bottom: 30px;
}

.member-preview-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
}

.member-card {
  background: white;
  padding: 1rem;
  border-radius: 10px;
  width: 150px;
  text-align: center;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s;
}

.member-card:hover {
  transform: translateY(-5px);
}

.member-card .avatar {
  width: 100%;
  aspect-ratio: 1/1;
  background: #eee;
  border-radius: 30%;
  margin-bottom: 0.5rem;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
}

.member-card.cloud .avatar {
  background-image: url('../img/cloud.jpg');
}

.member-card.cyber .avatar {
  background-image: url('../img/cyber.png');
}

.preview-more {
  margin-top: 30px;
  text-align: center;
}

/* 프로젝트 */
.project-preview {
  margin-top: 100px;
  text-align: center;
  padding: 20px;
}

.project-preview h3 {
  font-size: 3.5rem;
  margin-bottom: 30px;
}

.project-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 30px;
}

.project-card {
  width: 190px;
  background-color: #fff;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s;
}

.project-card img {
  width: 100%;
  height: 140px;
  object-fit: cover;
}

.project-card p {
  padding: 10px;
  font-weight: bold;
}

.project-card:hover {
  transform: translateY(-5px);
}

.project-preview h3,
.project-preview p,
.project-card p {
  color: #1a1a1a !important;
}

body.dark .project-preview h3,
body.dark .project-preview p,
body.dark .project-card p {
  color: #f4f4f4 !important;
}

.project-card {
  color: #1a1a1a;
}

body.dark .project-card {
  color: #1a1a1a;
}

/* 이벤트 */
.event {
  margin-top: 100px;
  padding: 20px;
  text-align: center;
}

.event h3 {
  font-size: 3.5rem;
  margin-bottom: 30px;
}

.event-grid {
  display: flex;
  flex-direction: column;
  gap: 40px;
  align-items: center;
}

.event-card {
  display: flex;
  background-color: #fff;
  border-radius: 15px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  overflow: hidden;
  width: 90%;
  max-width: 900px;
  height: 220px;
  transition: transform 0.2s;
}

.event-card:hover {
  transform: translateY(-5px);
}

.event-card img {
  width: 300px;
  height: 100%;
  object-fit: cover;
  flex-shrink: 0;
}

.event-text {
  flex: 1;
  padding: 30px 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: left;
}

.event-text h4 {
  font-size: 1.5rem;
  margin-bottom: 10px;
}

.event-text p {
  font-size: 1rem;
  color: #555;
}

body.dark .event-card {
  background-color: #333;
}

body.dark .event-text p {
  color: #ccc;
}

/* 푸터 */
footer {
  margin-top: 100px;
  padding: 20px;
  font-size: 0.9rem;
  color: #777;
  background-color: #f1f1f1;
  text-align: center;
}

body.dark footer {
  background-color: #2a2a2a;
  color: #ccc;
}

/* 반응형 */
@media (max-width: 768px) {
  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .header-right {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: 10px;
  }

  nav {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .stats {
    flex-direction: column;
    gap: 30px;
  }

  .project-grid,
  .event-grid {
    flex-direction: column;
    align-items: center;
  }

  .project-card,
  .event-card {
    width: 90%;
    max-width: 300px;
    flex-direction: column;
    height: auto;
  }

  .event-card img {
    width: 100%;
    height: 200px;
  }

  .event-text {
    text-align: center;
    padding: 20px;
  }
}

.banner-image {
  position: relative;
  background: url('../img/banner1.png') center/cover no-repeat;
  height: 650px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.banner-button {
  display: inline-block;
  padding: 14px 30px;
  background-color: #1e60c5;
  color: #ffffff;
  border-radius: 10px;
  font-size: 1.1rem;
  font-weight: bold;
  text-decoration: none;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  transition: background-color 0.3s, transform 0.2s;
}

.banner-button:hover {
  background-color: #154ea3;
  transform: translateY(-3px);
}

body.dark .banner-button {
  background-color: #3a70e0;
  color: #fff;
}

body.dark .banner-button:hover {
  background-color: #2b5fc0;
}

.member-card {
  color: #111 !important;
}

.member-card h4,
.member-card p {
  color: #111 !important;
}

.vision-section {
  margin-top: 100px;
  position: relative;
  height: 600px;
  color: white;
  text-align: center;
}

.vision-banner {
  background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)),
              url('../img/banner1.png') center/cover no-repeat;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.vision-content {
  display: flex;
  gap: 60px;
  flex-wrap: wrap;
  justify-content: center;
  padding: 40px;
}

.vision-item {
  max-width: 300px;
  padding: 20px;
}

.vision-emoji {
  font-size: 4rem;
  margin-bottom: 15px;
}

.vision-item h3 {
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.vision-item p {
  font-size: 1rem;
  line-height: 1.5;
  color: #ddd;
}

@media (max-width: 768px) {
  .vision-content {
    flex-direction: column;
    gap: 30px;
  }
}