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

body {
  font-family: 'Roboto Mono', monospace;
  background: #fff;
  color: #000;
}

/* Header */
header {
  border-bottom: 1px solid #e0e0e0;
  padding: 20px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 24px;
  font-weight: 300;
  letter-spacing: -0.5px;
}

nav {
  display: flex;
  gap: 30px;
}

nav a {
  text-decoration: none;
  color: #000;
  font-size: 14px;
  transition: opacity 0.2s;
}

nav a:hover {
  opacity: 0.6;
}

/* Main Content */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 60px 40px;
}

.page-title {
  font-size: 48px;
  font-weight: 300;
  margin-bottom: 60px;
  letter-spacing: -1px;
}

.section-title {
  font-size: 24px;
  font-weight: 400;
  margin-bottom: 40px;
}

/* Main Video Section */
.main-video-section {
  margin-bottom: 60px;
}

.video-container {
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.video-container iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.video-description {
  margin-top: 30px;
  text-align: center;
}

.project-title {
  font-size: 28px;
  font-weight: 400;
  margin-bottom: 15px;
  color: #000;
}

.project-description {
  font-size: 16px;
  line-height: 1.6;
  color: #666;
  width: 100%;
  margin: 0 auto;
}

/* Grid Layout */
.personas-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 30px;
  margin-bottom: 80px;
}

.persona-card {
  cursor: pointer;
  transition: transform 0.3s ease, opacity 0.3s ease;
  text-decoration: none;
  color: inherit;
  display: block;
}

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


.persona-image {
  width: 100%;
  aspect-ratio: 4/3;
  background: #f5f5f5;
  overflow: hidden;
  margin-bottom: 15px;
}

.persona-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.persona-name {
  font-size: 18px;
  font-weight: 400;
  margin-bottom: 5px;
}

.persona-tag {
  font-size: 13px;
  color: #666;
}

/* Detail Page */
.detail-page {
  display: none;
}

.detail-page.active {
  display: block;
}

.back-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #000;
  text-decoration: none;
  margin-bottom: 40px;
  font-size: 14px;
  transition: opacity 0.2s;
}

.back-button:hover {
  opacity: 0.6;
}

.detail-header {
  margin-bottom: 60px;
}

.detail-title {
  font-size: 40px;
  font-weight: 300;
  margin-bottom: 20px;
}

.detail-subtitle {
  font-size: 16px;
  color: #666;
}

.detail-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 60px;
  margin-bottom: 60px;
}

.video-section {
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
}

.video-section iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.info-section h3 {
  font-size: 18px;
  font-weight: 500;
  margin-bottom: 20px;
  margin-top: 30px;
}

.info-section h3:first-child {
  margin-top: 0;
}

.conversation-box {
  background: #f9f9f9;
  padding: 20px;
  border-radius: 4px;
  margin-bottom: 15px;
  line-height: 1.6;
  font-size: 14px;
}

.keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.keyword-tag {
  background: #000;
  color: #fff;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
}

@media (max-width: 768px) {
  .personas-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
  }

  .detail-content {
    grid-template-columns: 1fr;
  }

  header {
    padding: 15px 20px;
  }

  .container {
    padding: 40px 20px;
  }

  .page-title {
    font-size: 32px;
  }

  .video-container {
    max-width: 100%;
    margin-bottom: 40px;
  }

  .main-video-section {
    margin-bottom: 40px;
  }

  .project-title {
    font-size: 24px;
  }

  .project-description {
    font-size: 14px;
    padding: 0 20px;
  }

  .video-description {
    margin-top: 20px;
  }
}