/* ============================================
   COMPONENTS CSS - UI Components
   Digital Scholar Design System
   ============================================ */

/* ============================================
   TYPOGRAPHY COMPONENTS
   ============================================ */

.subtitle {
  font-family: var(--font-headings);
  font-size: var(--text-xl);
  font-style: italic;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

/* ============================================
   NAVIGATION
   ============================================ */

.main-nav {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: var(--color-blue);
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  padding: var(--space-md) 0;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.main-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.main-nav .logo {
  font-family: var(--font-headings);
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: white;
  text-decoration: none;
  border-bottom: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.main-nav .logo:hover {
  color: var(--color-teal);
  border-bottom: none;
}

.main-nav .logo-image {
  height: 2.5rem;
  width: auto;
  transition: transform var(--transition-fast);
}

.main-nav .logo:hover .logo-image {
  transform: scale(1.05);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: rgba(255, 255, 255, 0.85);
  border-bottom: 2px solid transparent;
  padding-bottom: 0.25rem;
  transition: all var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: white;
  border-bottom-color: var(--color-teal);
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.3);
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: rgba(255, 255, 255, 0.85);
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  border-color: var(--color-teal);
  color: var(--color-teal);
  background-color: rgba(0, 188, 140, 0.15);
}

/* Mobile Menu */
.mobile-menu-toggle {
  display: none;
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
  }

  .mobile-menu-toggle span {
    display: block;
    width: 1.5rem;
    height: 2px;
    background-color: white;
    transition: all var(--transition-base);
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    height: 100vh;
    width: 80%;
    max-width: 300px;
    background-color: var(--color-blue);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-3xl) var(--space-xl);
    box-shadow: var(--shadow-xl);
    transition: right var(--transition-slow);
  }

  .nav-links.open {
    right: 0;
  }

  .nav-links a {
    font-size: var(--text-base);
    width: 100%;
  }
}

/* ============================================
   HERO
   ============================================ */

.hero {
  padding: var(--space-4xl) 0 var(--space-3xl);
  text-align: center;
}

.hero-title {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: var(--text-xl);
  color: var(--text-secondary);
  font-weight: var(--font-normal);
  margin-bottom: var(--space-2xl);
}

.hero-cta {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================
   CARDS
   ============================================ */

.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-base);
}

.card:hover {
  border-color: var(--color-teal);
  box-shadow: var(--shadow-md);
}

.card-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.card-icon {
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-blue), var(--color-teal));
  color: white;
  border-radius: var(--border-radius-md);
  font-size: var(--text-2xl);
  flex-shrink: 0;
}

.card-title {
  font-family: var(--font-headings);
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin: 0;
}

.card-description {
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-md);
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-teal);
  font-weight: var(--font-medium);
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-link:hover {
  gap: var(--space-sm);
}

/* Card Grid */
.card-grid {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-xl);
  border-radius: var(--border-radius-md);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  line-height: 1.5;
}

.btn:hover {
  border-bottom: none;
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

/* Primary Button */
.btn-primary {
  background: linear-gradient(135deg, var(--color-blue), var(--color-teal));
  color: white;
  border-color: transparent;
}

.btn-primary:hover {
  box-shadow: 0 4px 12px rgba(0, 188, 140, 0.3);
}

/* Secondary Button */
.btn-secondary {
  background-color: transparent;
  color: var(--color-blue);
  border-color: var(--color-blue);
}

.btn-secondary:hover {
  background-color: var(--color-blue);
  color: white;
}

/* Tertiary Button */
.btn-tertiary {
  background-color: transparent;
  color: var(--text-secondary);
  border-color: var(--border-color);
}

.btn-tertiary:hover {
  border-color: var(--color-teal);
  color: var(--color-teal);
}

/* Button Sizes */
.btn-sm {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--text-sm);
}

.btn-lg {
  padding: var(--space-md) var(--space-2xl);
  font-size: var(--text-lg);
}

/* ============================================
   FORMS
   ============================================ */

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-base);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-teal);
  box-shadow: 0 0 0 3px rgba(0, 188, 140, 0.1);
}

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

.form-error {
  color: #dc3545;
  font-size: var(--text-sm);
  margin-top: var(--space-xs);
}

.form-success {
  color: var(--color-green);
  font-size: var(--text-sm);
  margin-top: var(--space-xs);
}

.form-honeypot {
  position: absolute;
  left: -9999px;
  opacity: 0;
  pointer-events: none;
}

/* ============================================
   SECTIONS
   ============================================ */

.section {
  padding: var(--space-2xl) 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-3xl);
}

.section-title {
  margin-bottom: var(--space-md);
}

.section-description {
  font-size: var(--text-lg);
  color: var(--text-secondary);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--space-3xl) 0 var(--space-xl);
  margin-top: auto;
}

.footer-content {
  text-align: center;
}

.footer-social {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  margin-bottom: var(--space-lg);
}

.footer-social a {
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-full);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  background: linear-gradient(135deg, var(--color-blue), var(--color-teal));
  border-color: transparent;
  color: white;
  transform: translateY(-2px);
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-lg);
  padding: 0;
  margin: 0;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

.footer-copyright {
  color: var(--text-tertiary);
  font-size: var(--text-sm);
}

/* ============================================
   UTILITIES
   ============================================ */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2xs) var(--space-sm);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: var(--border-radius-full);
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
}

.badge-teal {
  background-color: rgba(0, 188, 140, 0.1);
  color: var(--color-teal);
}

.badge-blue {
  background-color: rgba(55, 90, 127, 0.1);
  color: var(--color-blue);
}

.divider {
  height: 1px;
  background-color: var(--border-color);
  margin: var(--space-2xl) 0;
}

/* Skip to content */
.skip-to-content {
  position: absolute;
  top: -100px;
  left: var(--space-lg);
  background-color: var(--color-teal);
  color: white;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--border-radius-md);
  text-decoration: none;
  font-weight: var(--font-medium);
  z-index: var(--z-tooltip);
  transition: top var(--transition-fast);
}

.skip-to-content:focus {
  top: var(--space-lg);
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeInUp 0.6s ease-out;
}

.fade-in-delay-1 {
  animation: fadeInUp 0.6s ease-out 0.15s both;
}

.fade-in-delay-2 {
  animation: fadeInUp 0.6s ease-out 0.3s both;
}

.fade-in-delay-3 {
  animation: fadeInUp 0.6s ease-out 0.45s both;
}

/* ============================================
   RECENT POSTS (Bluesky Feed)
   ============================================ */

.recent-posts {
  padding: var(--space-xl) 0 var(--space-2xl);
}

.recent-posts-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.recent-posts-header span {
  padding-bottom: var(--space-xs);
  border-bottom: 2px solid var(--color-teal);
}

.recent-posts-header svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: currentColor;
}

.recent-posts-list {
  list-style: none;
  padding: 0;
  margin: 0;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.recent-posts-list li {
  margin-bottom: var(--space-2xs);
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
}

.recent-posts-list .post-date {
  color: var(--text-tertiary);
  font-size: var(--text-sm);
  flex-shrink: 0;
  min-width: 5rem;
}

.recent-posts-list a {
  color: var(--text-secondary);
  font-size: var(--text-base);
  line-height: 1.4;
  border-bottom: none;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.recent-posts-list a:hover {
  color: var(--link-hover);
}

.recent-posts-error {
  display: none;
}