:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary-color: #475569;
  --secondary-hover: #334155;
  --success-color: #16a34a;
  --success-hover: #15803d;
  --danger-color: #dc2626;

  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --border-color: #e2e8f0;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --input-bg: #f1f5f9;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --transition-speed: 0.25s;
}

[data-theme="dark"] {
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --border-color: #334155;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --input-bg: #0f172a;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

.app-header {
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 24px;
  box-shadow: var(--shadow-sm);
}

.header-container {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-icon {
  font-size: 1.5rem;
  color: var(--primary-color);
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.icon-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: background-color var(--transition-speed) ease;
}

.icon-btn:hover {
  background-color: var(--input-bg);
}

.main-wrapper {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 40px 20px;
}

.app-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 800px;
  padding: 36px;
  transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

.title-section {
  text-align: center;
  margin-bottom: 28px;
}

.title-section h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.title-section .subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.hidden {
  display: none !important;
}

.dropzone-card {
  border: 2px dashed var(--primary-color);
  border-radius: var(--radius-md);
  background-color: rgba(37, 99, 235, 0.03);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

.dropzone-card:hover, .dropzone-card.dragover {
  background-color: rgba(37, 99, 235, 0.08);
  border-color: var(--primary-hover);
}

.dropzone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.icon-wrapper i {
  font-size: 3.5rem;
  color: var(--primary-color);
}

.dropzone-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
}

.dropzone-hint {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
}

.btn-primary {
  background-color: var(--primary-color);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
}

.btn-secondary {
  background-color: var(--input-bg);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

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

.btn-success {
  background-color: var(--success-color);
  color: #ffffff;
}

.btn-success:hover {
  background-color: var(--success-hover);
}

.btn-outline {
  background-color: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.btn-outline:hover {
  background-color: var(--input-bg);
  color: var(--text-main);
}

.btn-large {
  padding: 14px 28px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

.file-info-card {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.file-info-grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  align-items: center;
  background-color: var(--input-bg);
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

@media (max-width: 640px) {
  .file-info-grid {
    grid-template-columns: 1fr;
  }
}

.preview-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

#pdfPreviewCanvas {
  max-width: 100%;
  max-height: 220px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  background-color: #ffffff;
}

.preview-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.details-box {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.file-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.file-icon {
  font-size: 1.8rem;
  color: var(--danger-color);
}

.file-name-text {
  font-size: 1.1rem;
  font-weight: 600;
  word-break: break-all;
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.meta-item {
  display: flex;
  flex-direction: column;
}

.meta-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.meta-value {
  font-size: 0.95rem;
  font-weight: 600;
}

.action-bar {
  display: flex;
  gap: 16px;
  justify-content: center;
}

.progress-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 20px 0;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  font-weight: 600;
}

.progress-bar-container {
  width: 100%;
  height: 12px;
  background-color: var(--input-bg);
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background-color: var(--primary-color);
  transition: width 0.2s ease;
}

.spinner-container {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.spinner-icon {
  color: var(--primary-color);
}

.result-card {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 20px 0;
}

.success-icon-box i {
  font-size: 4rem;
  color: var(--success-color);
}

.result-summary {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.result-actions {
  display: flex;
  gap: 16px;
  margin-top: 10px;
}

.loading-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.overlay-content {
  background-color: var(--card-bg);
  padding: 30px 40px;
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.overlay-spinner {
  font-size: 2.5rem;
  color: var(--primary-color);
}

.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 1100;
}

.toast {
  background-color: var(--card-bg);
  color: var(--text-main);
  border-left: 4px solid var(--primary-color);
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  animation: slideIn 0.3s ease forwards;
}

.toast.toast-error {
  border-left-color: var(--danger-color);
}

.toast.toast-success {
  border-left-color: var(--success-color);
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}
/* Custom Settings Control Styling */
.settings-box {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 12px;
}

.setting-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 6px;
}

.setting-input {
  width: 80px;
  padding: 6px 10px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--card-bg);
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.95rem;
}

.setting-input:focus {
  outline: 2px solid var(--primary-color);
}