/* Modern Premium Design System for PTUpapers */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --primary-50: #eff6ff;
  --primary-100: #dbeafe;
  --primary-500: #3b82f6;
  --primary-600: #2563eb;
  --primary-700: #1d4ed8;
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-700: #334155;
  --slate-900: #0f172a;
}

/* Universal Font Inheritance for Form Elements */
input, button, select, textarea {
  font-family: inherit;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: #f8fafc;
  color: #0f172a;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: -0.011em;
}

code, kbd, samp, pre, .font-mono {
  font-family: var(--font-mono);
  font-feature-settings: 'liga' 0, 'calt' 0;
}

/* Enhanced Typography for Search Inputs */
.search-input-hero {
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  font-weight: 500;
  letter-spacing: -0.015em;
  color: #0f172a;
}

.search-input-hero::placeholder {
  font-weight: 400;
  letter-spacing: -0.01em;
  color: #94a3b8;
}

.search-input-filter {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: #0f172a;
}

.search-input-filter::placeholder {
  font-weight: 400;
  color: #94a3b8;
}

/* Dropdown Search Results Typography */
.search-result-title {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9375rem;
  letter-spacing: -0.018em;
  color: #0f172a;
}

.search-result-code {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.02em;
}

.search-result-meta {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: -0.006em;
  color: #64748b;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 7px;
  height: 7px;
}

::-webkit-scrollbar-track {
  background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 9999px;
}

::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

/* Utility fallbacks & enhancements */
.shadow-2xs {
  box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
}

.shadow-xs {
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 1px 2px -1px rgba(0, 0, 0, 0.05);
}

.text-xxs {
  font-size: 0.6875rem;
  line-height: 0.875rem;
}

.line-clamp-1 {
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Smooth Card Hover Transitions */
.paper-card {
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease;
}

.paper-card:hover {
  transform: translateY(-3px);
  border-color: #93c5fd;
  box-shadow: 0 12px 24px -6px rgba(37, 99, 235, 0.1), 0 4px 8px -2px rgba(0, 0, 0, 0.04);
}

/* Shimmer / Skeleton Animation */
@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

.skeleton {
  background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}