/* Shared Utility Classes */

/* ============================================
   PAGE LAYOUT UTILITIES
   ============================================ */

.page-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.page-header {
  margin-bottom: 3rem;
}

.page-title {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-intro {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  max-width: 700px;
}

/* ============================================
   TAG COMPONENT
   ============================================ */

.tag {
  font-size: 0.75rem;
  padding: 0.25rem 0.625rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.tag:hover {
  background: var(--color-bg-elevated);
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.15);
}

.tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

/* ============================================
   CARD LIST UTILITIES
   ============================================ */

.card-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.card-list--compact {
  gap: 1.5rem;
}

/* Card hover effects */
.card-list > * {
  transition: all var(--transition-base);
}

.card-list > *:hover {
  transform: translateY(-4px);
}

/* Interactive card style */
.card-interactive {
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.card-interactive::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.1), transparent);
  transition: left var(--transition-base);
}

.card-interactive:hover::before {
  left: 100%;
}

.card-interactive:hover {
  border-color: var(--color-accent-muted);
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.15);
  transform: translateY(-6px);
}

/* ============================================
   EMPTY STATE
   ============================================ */

.empty-state {
  color: var(--color-text-secondary);
  font-style: italic;
  font-size: 1.125rem;
}

/* ============================================
   SCROLL ANIMATION UTILITIES
   ============================================ */

.fade-in-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-scroll.in-view {
  opacity: 1;
  transform: translateY(0);
}

.slide-in-left-scroll {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-left-scroll.in-view {
  opacity: 1;
  transform: translateX(0);
}

.slide-in-right-scroll {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-right-scroll.in-view {
  opacity: 1;
  transform: translateX(0);
}

.scale-in-scroll {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.scale-in-scroll.in-view {
  opacity: 1;
  transform: scale(1);
}

/* ============================================
   BUTTON HOVER EFFECTS
   ============================================ */

button,
input[type="button"],
input[type="submit"] {
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

button:hover,
input[type="button"]:hover,
input[type="submit"]:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.3);
}

button:active,
input[type="button"]:active,
input[type="submit"]:active {
  transform: translateY(0);
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
  .page-container {
    padding: 1.5rem 1rem;
  }

  .page-title {
    font-size: 2rem;
  }

  .page-intro {
    font-size: 1rem;
  }

  .tags-list {
    gap: 0.375rem;
  }

  .tag {
    font-size: 0.6875rem;
    padding: 0.1875rem 0.5rem;
  }
}