:root {
  --primary-color: #2563eb;
  --secondary-color: #475569;
  --accent-color: #3b82f6;
  --background-bg: #f8fafc;
  --card-bg: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-radius: 12px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --transition: all 0.3s ease;
}

body {
  font-family: 'Noto Sans KR', 'Poppins', sans-serif;
  background-color: var(--background-bg);
  color: var(--text-primary);
  line-height: 1.6;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  letter-spacing: -0.025em;
}

/* Card Styles */
.project-card {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  height: 100%;
  border: 1px solid rgba(0, 0, 0, 0.05);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.project-card-header {
  padding: 1.5rem;
  background: linear-gradient(135deg, #eff6ff 0%, #ffffff 100%);
  border-bottom: 1px solid #f1f5f9;
}

.project-image-placeholder {
  height: 180px;
  background: linear-gradient(120deg, #a1c4fd 0%, #c2e9fb 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 3rem;
  font-weight: bold;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.project-card-body {
  padding: 1.5rem;
  flex-grow: 1;
}

.badge-group {
  background-color: #e0f2fe;
  color: #0369a1;
  font-weight: 600;
  padding: 0.35em 0.8em;
  border-radius: 9999px;
  font-size: 0.75rem;
  margin-bottom: 0.5rem;
  display: inline-block;
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.card-text-muted {
  font-size: 0.875rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-bottom: 1rem;
}

.info-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px dashed #e2e8f0;
  font-size: 0.9rem;
}

.info-item {
  display: flex;
  justify-content: space-between;
}

.info-label {
  color: var(--text-secondary);
  font-weight: 500;
}

.info-value {
  color: var(--text-primary);
  font-weight: 600;
  text-align: right;
}

.features-box {
  background: #f8fafc;
  border-radius: 8px;
  padding: 1rem;
  margin-top: 1rem;
  font-size: 0.85rem;
  color: #475569;
  /* line-clamp */
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  position: relative;
}

.btn-view-details {
  margin-top: auto;
  width: 100%;
  padding: 0.75rem;
  border-radius: 0 0 var(--border-radius) var(--border-radius);
  background-color: var(--card-bg);
  color: var(--primary-color);
  font-weight: 600;
  border-top: 1px solid #f1f5f9;
  text-align: center;
  text-decoration: none;
  transition: var(--transition);
}

.btn-view-details:hover {
  background-color: #f8fafc;
  color: var(--accent-color);
}

/* Category Tabs */
.nav-pills .nav-link {
  border-radius: 50px;
  padding: 0.5rem 1.25rem;
  margin-right: 0.5rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: white;
  border: 1px solid #e2e8f0;
  transition: var(--transition);
}

.nav-pills .nav-link:hover {
  background-color: #f1f5f9;
}

.nav-pills .nav-link.active {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
  box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.3);
}

/* Pagination */
.pagination .page-link {
  border: none;
  color: var(--text-secondary);
  border-radius: 8px;
  margin: 0 0.15rem;
  font-weight: 500;
}

.pagination .page-item.active .page-link {
  background-color: var(--primary-color);
  color: white;
  box-shadow: var(--shadow-md);
}

/* Animations */
[data-aos] {
  pointer-events: none;
}

[data-aos].aos-animate {
  pointer-events: auto;
}