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

[hidden] {
  display: none !important;
}

:root {
  --bg: #0a0a0a;
  --surface: #141414;
  --surface-light: #1e1e1e;
  --border: #2a2a2a;
  --border-light: #333;
  --text: #e0e0e0;
  --text-dim: #777;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --red: #ef4444;
  --yellow: #f59e0b;
  --green: #22c55e;
  --radius: 6px;
  --radius-sm: 4px;
}

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 14px;
  display: flex;
  flex-direction: column;
  user-select: none;
  -webkit-user-select: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

button:disabled {
  opacity: 0.35;
  cursor: default;
}

input[type="text"] {
  font-family: inherit;
  font-size: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  outline: none;
}

input[type="text"]:focus {
  border-color: var(--accent);
}

/* ── Toolbar ── */
.toolbar {
  height: 48px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  flex-shrink: 0;
  gap: 8px;
  z-index: 100;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 4px;
}

.toolbar-divider {
  width: 1px;
  height: 24px;
  background: var(--border);
  margin: 0 6px;
}

.brand {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.3px;
  margin-right: 4px;
}

.brand-dot {
  color: var(--accent);
}

.tool-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 6px 10px;
  border-radius: var(--radius);
  color: var(--text-dim);
  transition: background 0.15s, color 0.15s;
}

.tool-btn:not(:disabled):hover {
  background: var(--surface-light);
  color: var(--text);
}

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

.tool-btn.primary:not(:disabled):hover {
  background: var(--accent-hover);
}

.tool-btn svg {
  flex-shrink: 0;
}

.btn-label {
  font-size: 13px;
}

/* Toggle groups */
.toggle-group {
  display: flex;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.toggle-btn {
  padding: 5px 12px;
  font-size: 13px;
  color: var(--text-dim);
  transition: background 0.15s, color 0.15s;
  border-right: 1px solid var(--border);
}

.toggle-btn:last-child {
  border-right: none;
}

.toggle-btn.active {
  background: var(--surface-light);
  color: var(--text);
}

.toggle-btn:not(.active):hover {
  background: rgba(255,255,255,0.04);
}

/* ── Main container ── */
.main-container {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

/* ── Sidebar ── */
.sidebar {
  width: 100px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  flex-shrink: 0;
  padding: 8px;
}

.thumbnail-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.thumbnail {
  aspect-ratio: 3/4;
  background: var(--surface-light);
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--text-dim);
  cursor: pointer;
  transition: border-color 0.15s;
  overflow: hidden;
  position: relative;
}

.thumbnail:hover {
  border-color: var(--border-light);
}

.thumbnail.active {
  border-color: var(--accent);
}

.thumbnail canvas {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* ── Canvas area ── */
.canvas-area {
  flex: 1;
  overflow: auto;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.canvas-area.mode-manual {
  cursor: crosshair;
}

.canvas-area.mode-auto {
  cursor: pointer;
}

/* ── Dropzone ── */
.dropzone {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

.dropzone-content {
  text-align: center;
  color: var(--text-dim);
}

.dropzone-content h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.dropzone-content .dropzone-sub {
  margin-bottom: 20px;
  font-size: 13px;
}

.dropzone-icon {
  margin-bottom: 16px;
  color: var(--border-light);
}

.upload-btn {
  background: var(--accent);
  color: #fff;
  padding: 10px 24px;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 14px;
  transition: background 0.15s;
}

.upload-btn:hover {
  background: var(--accent-hover);
}

.supported-formats {
  margin-top: 12px;
  font-size: 12px;
  color: var(--text-dim);
}

.dropzone.drag-over {
  background: rgba(59, 130, 246, 0.06);
  outline: 2px dashed var(--accent);
  outline-offset: -12px;
}

/* ── Viewer ── */
.viewer {
  width: 100%;
  padding: 20px;
}

.pages-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.page-wrapper {
  position: relative;
  background: #1a1a1a;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0,0,0,0.4);
  line-height: 0;
}

.page-wrapper .redact-canvas {
  display: block;
}

.page-wrapper .highlight-overlay {
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
}

/* ── Selection rectangle ── */
.selection-rect {
  position: fixed;
  border: 2px dashed var(--accent);
  background: rgba(59, 130, 246, 0.08);
  pointer-events: none;
  z-index: 200;
}

/* ── Find bar ── */
.find-bar {
  height: 48px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  z-index: 100;
}

.find-bar-inner {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 16px;
  width: 100%;
}

.find-label {
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  color: var(--text-dim);
}

.find-input {
  flex: 1;
  max-width: 360px;
}

.find-option {
  display: flex;
  align-items: center;
  gap: 3px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
  transition: background 0.15s, color 0.15s;
}

.find-option:hover {
  background: var(--surface-light);
}

.find-option input[type="checkbox"] {
  display: none;
}

.find-option:has(input:checked) {
  background: var(--accent);
  color: #fff;
}

.match-count {
  font-size: 13px;
  color: var(--text-dim);
  white-space: nowrap;
}

.find-btn {
  background: var(--red);
  color: #fff;
  padding: 6px 14px;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 13px;
  white-space: nowrap;
  transition: opacity 0.15s;
}

.find-btn:not(:disabled):hover {
  opacity: 0.85;
}

/* ── Context popup ── */
.context-popup {
  position: fixed;
  background: var(--surface-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 4px;
  z-index: 300;
  min-width: 200px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
}

.popup-action {
  display: block;
  width: 100%;
  text-align: left;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--text);
  transition: background 0.1s;
}

.popup-action:hover {
  background: rgba(255,255,255,0.06);
}

.popup-action.cancel {
  color: var(--text-dim);
  margin-top: 2px;
  border-top: 1px solid var(--border);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.popup-count {
  color: var(--text-dim);
  font-size: 12px;
}

/* ── Overlays ── */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
}

.overlay-box {
  background: var(--surface-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 24px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.shimmer-bar {
  width: 180px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--border) 0%, var(--border-light) 50%, var(--border) 100%);
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
}

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

/* ── Toast ── */
.toast {
  position: fixed;
  bottom: 64px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface-light);
  border: 1px solid var(--border-light);
  color: var(--text);
  padding: 8px 16px;
  border-radius: var(--radius);
  font-size: 13px;
  z-index: 400;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
  animation: toastIn 0.2s ease-out;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(8px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ── Privacy note ── */
.privacy-note {
  position: fixed;
  bottom: 8px;
  right: 12px;
  font-size: 11px;
  color: var(--text-dim);
  opacity: 0.6;
  z-index: 50;
  pointer-events: none;
}

/* ── Red flash for redaction preview ── */
.redact-flash {
  position: absolute;
  background: rgba(239, 68, 68, 0.35);
  pointer-events: none;
  animation: flash 0.2s ease-out forwards;
}

@keyframes flash {
  0% { opacity: 1; }
  100% { opacity: 0; }
}

/* ── Scrollbar ── */
.canvas-area::-webkit-scrollbar,
.sidebar::-webkit-scrollbar {
  width: 6px;
}

.canvas-area::-webkit-scrollbar-track,
.sidebar::-webkit-scrollbar-track {
  background: transparent;
}

.canvas-area::-webkit-scrollbar-thumb,
.sidebar::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

.canvas-area::-webkit-scrollbar-thumb:hover,
.sidebar::-webkit-scrollbar-thumb:hover {
  background: var(--border-light);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .sidebar {
    display: none !important;
  }

  .btn-label {
    display: none;
  }

  .toolbar {
    padding: 0 8px;
    gap: 4px;
  }

  .tool-btn {
    padding: 6px 8px;
  }

  .toggle-btn {
    padding: 5px 8px;
  }

  .find-bar-inner {
    padding: 0 8px;
    gap: 6px;
  }

  .find-label {
    display: none;
  }

  .find-input {
    max-width: none;
  }

  .privacy-note {
    display: none;
  }
}