/* ============================================
   PDF TOOLS - PROFESSIONAL DESIGN SYSTEM
   Complete dark/light mode, animations, responsive
   ============================================ */

/* ---------- CSS CUSTOM PROPERTIES ---------- */
:root {
  --pdf-primary: #ef4444;
  --pdf-primary-dark: #dc2626;
  --pdf-primary-light: #f87171;
  --pdf-primary-bg: #fee2e2;
  --pdf-secondary: #8b5cf6;
  --pdf-secondary-bg: #ede9fe;
  --pdf-success: #10b981;
  --pdf-success-bg: #d1fae5;
  --pdf-warning: #f59e0b;
  --pdf-surface: #ffffff;
  --pdf-surface-2: #f9fafb;
  --pdf-surface-3: #f3f4f6;
  --pdf-border: #e5e7eb;
  --pdf-border-strong: #d1d5db;
  --pdf-text: #111827;
  --pdf-text-2: #6b7280;
  --pdf-text-3: #9ca3af;
  --pdf-radius-sm: 8px;
  --pdf-radius: 12px;
  --pdf-radius-lg: 16px;
  --pdf-shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --pdf-shadow-hover: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --pdf-font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --pdf-font-mono: 'JetBrains Mono', 'Courier New', monospace;
  --pdf-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}



/* ---------- BASE RESETS ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--pdf-font-body);
  background: var(--pdf-surface-2);
  color: var(--pdf-text);
  line-height: 1.5;
  transition: var(--pdf-transition);
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- HEADER ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--pdf-surface);
  border-bottom: 1px solid var(--pdf-border);
  backdrop-filter: blur(10px);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  gap: 2rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--pdf-text);
}

.logo-mark {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--pdf-primary), var(--pdf-primary-dark));
  border-radius: var(--pdf-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
}

/* ---------- BREADCRUMB ---------- */
.breadcrumb-nav {
  margin: 1.5rem 0 1rem;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  font-size: 0.875rem;
  color: var(--pdf-text-3);
}

.breadcrumb li + li::before {
  content: "›";
  margin-right: 0.5rem;
}

.breadcrumb a {
  color: var(--pdf-primary);
  text-decoration: none;
}

/* ---------- HERO SECTION ---------- */
.hero-section {
  margin: 2rem 0 3rem;
  animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--pdf-primary-bg);
  color: var(--pdf-primary);
  padding: 0.35rem 1rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--pdf-primary);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
}

#categoryTitle {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.gradient-text {
  background: linear-gradient(135deg, var(--pdf-primary), var(--pdf-primary-light));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--pdf-text-2);
  max-width: 600px;
  margin-bottom: 1.5rem;
}

.trust-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-size: 0.8rem;
  color: var(--pdf-success);
  font-weight: 500;
}

/* ---------- TOOL NAVIGATION ---------- */
.tool-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
  padding: 0.75rem 1rem;
  background: var(--pdf-surface);
  border: 1px solid var(--pdf-border);
  border-radius: var(--pdf-radius);
}

.tool-nav-btn {
  background: none;
  border: 1px solid var(--pdf-border);
  color: var(--pdf-text-2);
  font-family: var(--pdf-font-body);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: var(--pdf-radius-sm);
  cursor: pointer;
  transition: var(--pdf-transition);
}

.tool-nav-btn:hover,
.tool-nav-btn.active {
  background: var(--pdf-primary);
  border-color: var(--pdf-primary);
  color: white;
}

/* ---------- TOOL GRID ---------- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(450px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

/* ---------- CARDS ---------- */
.pdf-card {
  background: var(--pdf-surface);
  border: 1px solid var(--pdf-border);
  border-radius: var(--pdf-radius-lg);
  padding: 1.5rem;
  transition: var(--pdf-transition);
  position: relative;
  overflow: hidden;
  animation: fadeInUp 0.4s ease-out;
}

.pdf-card:nth-child(2) { animation-delay: 0.05s; }
.pdf-card:nth-child(3) { animation-delay: 0.1s; }
.pdf-card:nth-child(4) { animation-delay: 0.15s; }

.pdf-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--pdf-primary), var(--pdf-primary-light));
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.pdf-card:hover::before {
  transform: scaleX(1);
}

.pdf-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--pdf-shadow-hover);
}

.pdf-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--pdf-border);
}

.pdf-card-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--pdf-primary-bg), transparent);
  border-radius: var(--pdf-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  transition: var(--pdf-transition);
}

.pdf-card:hover .pdf-card-icon {
  transform: scale(1.05) rotate(5deg);
}

.pdf-card-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--pdf-text);
  flex: 1;
}

/* Focus Modal */
.pdf-focus-btn {
  padding: 0.35rem 0.75rem;
  font-size: 0.75rem;
}

.pdf-focus-btn.is-hidden {
  display: none !important;
}

.pdf-focus-inline-close {
  display: none !important;
}

.pdf-focus-inline-close.active {
  display: inline-flex !important;
}

.pdf-focus-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 9998;
  opacity: 0;
  pointer-events: none;
  transition: var(--pdf-transition);
}

.pdf-focus-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.pdf-focus-host {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.pdf-focus-host.active {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.pdf-card.is-focused {
  position: relative;
  width: min(900px, 90vw);
  max-height: 90vh;
  overflow: auto;
  box-shadow: var(--pdf-shadow-hover);
  pointer-events: auto;
  transform: none !important;
}

body.pdf-modal-open {
  overflow: hidden;
}

/* ---------- FORM ELEMENTS ---------- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 1rem;
}

input[type="file"] {
  width: 100%;
  font-family: var(--pdf-font-body);
  font-size: 0.875rem;
  background: var(--pdf-surface-2);
  border: 1.5px solid var(--pdf-border);
  border-radius: var(--pdf-radius-sm);
  padding: 0.6rem 0.75rem;
  color: var(--pdf-text);
  transition: var(--pdf-transition);
  cursor: pointer;
  margin-bottom: 0.75rem;
}

input[type="file"]:focus {
  outline: none;
  border-color: var(--pdf-primary);
  box-shadow: 0 0 0 3px var(--pdf-primary-bg);
}

input[type="text"], input[type="number"], select {
  width: 100%;
  font-family: var(--pdf-font-body);
  font-size: 0.875rem;
  background: var(--pdf-surface-2);
  border: 1.5px solid var(--pdf-border);
  border-radius: var(--pdf-radius-sm);
  padding: 0.6rem 0.75rem;
  color: var(--pdf-text);
  transition: var(--pdf-transition);
}

input:focus, select:focus {
  outline: none;
  border-color: var(--pdf-primary);
  box-shadow: 0 0 0 3px var(--pdf-primary-bg);
}

textarea {
  width: 100%;
  font-family: var(--pdf-font-body);
  font-size: 0.875rem;
  background: var(--pdf-surface-2);
  border: 1.5px solid var(--pdf-border);
  border-radius: var(--pdf-radius-sm);
  padding: 0.75rem;
  color: var(--pdf-text);
  transition: var(--pdf-transition);
  resize: vertical;
  min-height: 120px;
}

textarea:focus {
  outline: none;
  border-color: var(--pdf-primary);
  box-shadow: 0 0 0 3px var(--pdf-primary-bg);
}

label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--pdf-text-3);
  display: block;
  margin-bottom: 0.25rem;
}

/* File Meta */
.file-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
  background: var(--pdf-surface-3);
  border-radius: var(--pdf-radius-sm);
  padding: 0.75rem;
  margin: 0.75rem 0;
  font-size: 0.75rem;
}

.file-meta div {
  display: flex;
  flex-direction: column;
}

.file-meta strong {
  color: var(--pdf-text-2);
  font-size: 0.7rem;
  text-transform: uppercase;
}

.file-meta span {
  font-family: var(--pdf-font-mono);
  word-break: break-all;
}

/* Preview Frame */
.preview-wrap {
  margin-top: 1rem;
  border: 1px solid var(--pdf-border);
  border-radius: var(--pdf-radius);
  overflow: hidden;
  background: var(--pdf-surface-2);
}

iframe {
  width: 100%;
  min-height: 420px;
  border: 0;
}

/* ---------- BUTTONS ---------- */
.inline-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1rem 0;
}

.btn {
  padding: 0.6rem 1.25rem;
  border-radius: var(--pdf-radius-sm);
  font-family: var(--pdf-font-body);
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: var(--pdf-transition);
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--pdf-primary), var(--pdf-primary-dark));
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--pdf-shadow);
}

.btn-secondary {
  background: var(--pdf-surface-3);
  color: var(--pdf-text-2);
  border: 1px solid var(--pdf-border);
}

.btn-secondary:hover {
  background: var(--pdf-surface);
  color: var(--pdf-text);
  transform: translateY(-2px);
}

/* ---------- RESULT DISPLAY ---------- */
.result {
  background: var(--pdf-surface-2);
  border-radius: var(--pdf-radius);
  padding: 0.75rem;
  font-family: var(--pdf-font-mono);
  font-size: 0.75rem;
  border: 1px solid var(--pdf-border);
  margin-top: 0.5rem;
  word-break: break-word;
}

.pdf-hint {
  font-size: 0.78rem;
  color: var(--pdf-text-3);
  line-height: 1.45;
  margin-bottom: 0.6rem;
}

.pdf-msg-error {
  border-color: #ef4444 !important;
  background: #fef2f2 !important;
  color: #b91c1c !important;
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0;
  max-height: 220px;
  overflow-y: auto;
}

.prompt-chip {
  background: var(--pdf-surface-3);
  border: 1px solid var(--pdf-border);
  border-radius: 100px;
  padding: 0.35rem 0.85rem;
  font-size: 0.75rem;
  font-family: var(--pdf-font-mono);
  cursor: pointer;
  transition: var(--pdf-transition);
}

.prompt-chip:hover {
  background: var(--pdf-primary-bg);
  border-color: var(--pdf-primary);
  color: var(--pdf-primary);
}

.empty-hint {
  color: var(--pdf-text-3);
  font-style: italic;
  padding: 0.6rem;
}

.full-width {
  grid-column: 1 / -1;
}

/* ---------- AD SLOTS ---------- */
.ad-slot {
  background: linear-gradient(135deg, var(--pdf-surface-3), var(--pdf-surface));
  border: 2px dashed var(--pdf-border-strong);
  border-radius: var(--pdf-radius);
  padding: 2rem;
  text-align: center;
  color: var(--pdf-text-3);
  font-weight: 500;
  margin-bottom: 1.25rem;
}

/* ---------- FAQ SECTION ---------- */
.faq-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--pdf-border);
}

.faq-section h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-item {
  background: var(--pdf-surface);
  border: 1px solid var(--pdf-border);
  border-radius: var(--pdf-radius-sm);
  overflow: hidden;
  transition: var(--pdf-transition);
}

.faq-item[open] {
  border-color: var(--pdf-primary);
}

.faq-item summary {
  padding: 1rem 1.25rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

.faq-item summary::after {
  content: "+";
  float: right;
  color: var(--pdf-text-3);
}

.faq-item[open] summary::after {
  content: "−";
  color: var(--pdf-primary);
}

.faq-item p {
  padding: 0 1.25rem 1rem;
  color: var(--pdf-text-2);
  line-height: 1.6;
}

/* ---------- FOOTER ---------- */
.site-footer {
  background: var(--pdf-surface);
  border-top: 1px solid var(--pdf-border);
  margin-top: 4rem;
  padding: 1.5rem 0;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--pdf-text-3);
}

.footer-grid a {
  color: var(--pdf-primary);
  text-decoration: none;
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
  
  .tool-grid {
    grid-template-columns: 1fr;
  }
  
  .grid-2 {
    grid-template-columns: 1fr;
  }
.pdf-focus-host.active {
    padding: 0.5rem;
  }
  
  .pdf-card.is-focused {
    width: 95vw;
    padding: 1rem;
  }
  
  .file-meta {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .inline-row {
    flex-direction: column;
  }
  
  .tool-nav-btn {
    font-size: 0.75rem;
    padding: 0.4rem 0.8rem;
  }
  
  .hero-description {
    font-size: 1rem;
  }
  
  iframe {
    min-height: 300px;
  }
}

/* ---------- SCROLLBAR ---------- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--pdf-surface-3);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb {
  background: var(--pdf-primary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--pdf-primary-dark);
}