/* ========================================
   Modern UI Components
   ======================================== */

/* Modern Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--primary-color, #2563eb);
  color: #ffffff;
  border: 2px solid transparent;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: inherit;
  line-height: 1.5;
}

.btn:hover {
  background: var(--primary-color-dark, #1d4ed8);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
}

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

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

/* Button Variants */
.btn-secondary {
  background: #6b7280;
  border-color: #6b7280;
}

.btn-secondary:hover {
  background: #4b5563;
  border-color: #4b5563;
}

.btn-outline {
  background: transparent;
  color: var(--primary-color, #2563eb);
  border-color: var(--primary-color, #2563eb);
}

.btn-outline:hover {
  background: var(--primary-color, #2563eb);
  color: #ffffff;
}

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--primary-color, #2563eb);
}

.btn-ghost:hover {
  background: rgba(37, 99, 235, 0.1);
}

/* Button Sizes */
.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1rem;
}

.btn-full {
  width: 100%;
}

/* Badge Component */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.75rem;
  background: var(--primary-color, #2563eb);
  color: #ffffff;
  border-radius: 50px;
  font-size: 0.8125rem;
  font-weight: 600;
  line-height: 1.5;
}

.badge-secondary {
  background: #6b7280;
}

.badge-success {
  background: #10b981;
}

.badge-warning {
  background: #f59e0b;
}

.badge-danger {
  background: #ef4444;
}

.badge-outline {
  background: transparent;
  border: 2px solid currentColor;
}

/* Card Component */
.card {
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 1.5rem;
  transition: all 0.3s ease;
}

.card:hover {
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
  transform: translateY(-4px);
}

.card-header {
  margin: -1.5rem -1.5rem 1.5rem;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid #e5e7eb;
}

.card-title {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
  color: #111827;
}

.card-body {
  margin: 0;
}

.card-footer {
  margin: 1.5rem -1.5rem -1.5rem;
  padding: 1.25rem 1.5rem;
  border-top: 1px solid #e5e7eb;
  background: #f9fafb;
  border-radius: 0 0 12px 12px;
}

/* Alert Component */
.alert {
  padding: 1rem 1.25rem;
  border-radius: 8px;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.alert-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.alert-content {
  flex: 1;
}

.alert-title {
  margin: 0 0 0.25rem;
  font-weight: 600;
  font-size: 0.9375rem;
}

.alert-message {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.6;
}

.alert-info {
  background: #eff6ff;
  color: #1e40af;
  border: 1px solid #bfdbfe;
}

.alert-success {
  background: #ecfdf5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.alert-warning {
  background: #fffbeb;
  color: #92400e;
  border: 1px solid #fde68a;
}

.alert-danger {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

/* Progress Bar */
.progress {
  width: 100%;
  height: 8px;
  background: #e5e7eb;
  border-radius: 50px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--primary-color, #2563eb);
  border-radius: 50px;
  transition: width 0.6s ease;
  position: relative;
  overflow: hidden;
}

.progress-bar::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

/* Tooltip */
.tooltip {
  position: relative;
  display: inline-flex;
}

.tooltip-content {
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  padding: 0.5rem 0.75rem;
  background: #1f2937;
  color: #ffffff;
  font-size: 0.8125rem;
  white-space: nowrap;
  border-radius: 6px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  pointer-events: none;
  z-index: 1000;
}

.tooltip-content::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 4px solid transparent;
  border-top-color: #1f2937;
}

.tooltip:hover .tooltip-content {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(-4px);
}

/* Skeleton Loader */
.skeleton {
  background: linear-gradient(90deg, #f3f4f6 0%, #e5e7eb 50%, #f3f4f6 100%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: 4px;
}

@keyframes skeleton-loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

.skeleton-text {
  height: 1em;
  margin-bottom: 0.5rem;
}

.skeleton-title {
  height: 1.5em;
  width: 60%;
  margin-bottom: 1rem;
}

.skeleton-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
}

.skeleton-thumbnail {
  width: 100%;
  padding-top: 56.25%;
  border-radius: 8px;
  margin-bottom: 1rem;
}

/* Loading Spinner */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.spinner-lg {
  width: 40px;
  height: 40px;
  border-width: 3px;
}

/* Responsive Utilities */
@media (max-width: 640px) {
  .btn {
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
  }

  .card {
    padding: 1.25rem;
  }

  .card-header,
  .card-footer {
    margin: -1.25rem -1.25rem 1.25rem;
    padding: 1rem 1.25rem;
  }

  .card-footer {
    margin: 1.25rem -1.25rem -1.25rem;
  }
}