:root {
  --bg-color: #0f172a;
  --surface-color: #1e293b;
  --surface-hover: #334155;
  --border-color: #334155;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --success: #10b981;
  --success-hover: #059669;
  --danger: #ef4444;
  --radius: 8px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  padding: 2rem 1rem;
}

.container {
  max-width: 960px;
  margin: 0 auto;
}

.app-header {
  text-align: center;
  margin-bottom: 2rem;
}

.badge {
  display: inline-block;
  background-color: rgba(37, 99, 235, 0.2);
  color: #60a5fa;
  border: 1px solid rgba(37, 99, 235, 0.4);
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.app-header h1 {
  font-size: 1.85rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: var(--text-muted);
  font-size: 1rem;
}

.card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
}

/* Upload zone */
.drop-zone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius);
  padding: 3rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s;
}

.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--primary);
  background-color: rgba(37, 99, 235, 0.05);
}

.icon-upload {
  width: 48px;
  height: 48px;
  color: var(--primary);
  margin-bottom: 1rem;
}

.primary-text {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.secondary-text {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.file-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.file-name {
  font-size: 1.1rem;
  font-weight: 600;
}

.file-pages {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.btn-link {
  background: none;
  border: none;
  color: #60a5fa;
  cursor: pointer;
  font-size: 0.9rem;
  text-decoration: underline;
  margin-top: 0.5rem;
}

/* Controls Grid */
.controls-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 768px) {
  .controls-grid {
    grid-template-columns: 1fr;
  }
}

.slider-panel h3, .preview-panel h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.help-text {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.slider-container {
  margin-bottom: 1.5rem;
}

input[type=range] {
  width: 100%;
  accent-color: var(--primary);
  cursor: pointer;
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.label-opt.active {
  color: #60a5fa;
  font-weight: 600;
}

.preset-description {
  background-color: rgba(15, 23, 42, 0.6);
  border-left: 3px solid var(--primary);
  padding: 0.85rem 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-bottom: 1.5rem;
}

/* Preview */
.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.toggle-group {
  display: flex;
  background-color: #0f172a;
  border-radius: 6px;
  padding: 2px;
}

.btn-toggle {
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-toggle.active {
  background-color: var(--surface-color);
  color: var(--text-main);
  font-weight: 600;
}

.preview-frame {
  position: relative;
  background-color: #000;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
}

.preview-frame img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

.loader-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(15, 23, 42, 0.7);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  font-size: 0.85rem;
}

/* Boutons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.2s, transform 0.1s;
}

.btn:active {
  transform: scale(0.98);
}

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

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

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

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

.btn-secondary {
  background-color: var(--surface-hover);
  color: var(--text-main);
}

.btn-large {
  width: 100%;
  padding: 0.85rem 1.5rem;
  font-size: 1rem;
}

/* Spinner */
.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid rgba(255, 255, 255, 0.2);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner.large {
  width: 48px;
  height: 48px;
  border-width: 4px;
  margin-bottom: 1.5rem;
}

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

/* Processing */
.processing-card {
  text-align: center;
  padding: 3rem 1.5rem;
}

.processing-content {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.processing-content h2 {
  font-size: 1.35rem;
  margin-bottom: 0.5rem;
}

.processing-content p {
  color: var(--text-muted);
}

/* Resultats */
.result-card {
  text-align: center;
  padding: 2.5rem 1.5rem;
}

.icon-success {
  width: 56px;
  height: 56px;
  color: var(--success);
  margin-bottom: 1rem;
}

.success-banner h2 {
  font-size: 1.4rem;
  margin-bottom: 0.25rem;
}

.success-sub {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 2rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-box {
  background-color: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1rem;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: #60a5fa;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.result-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 380px;
  margin: 0 auto;
}

/* Auth card */
.auth-card {
  max-width: 480px;
  margin: 0 auto 1.5rem auto;
}

.inline-form {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
}

.inline-form input {
  flex: 1;
  background-color: #0f172a;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: var(--text-main);
  padding: 0.65rem 1rem;
  font-size: 0.95rem;
}

.error-msg {
  color: var(--danger);
  font-size: 0.85rem;
  margin-top: 0.5rem;
}

.app-footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-top: 3rem;
}