:root {
  --bg: #0b0b0c;
  --fg: #f4f4f5;
  --muted: #a1a1aa;
  --accent: #3b82f6;
  --danger: #ef4444;
  --card: #18181b;
  --border: #27272a;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.4 -apple-system, system-ui, sans-serif;
  min-height: 100dvh;
  overscroll-behavior: none;
  overflow: hidden;
}

button {
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.8rem 0.9rem;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
}

button:disabled { opacity: 0.4; cursor: not-allowed; }
button:active:not(:disabled) { transform: scale(0.98); }

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

button.success {
  background: #22c55e;
  border-color: #22c55e;
  color: white;
}

button.danger {
  background: transparent;
  border-color: var(--border);
  color: var(--danger);
}

/* Fullscreen sections */
#library, #camera, #editor, #docsView, #settingsView, #pdfView {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

#camera {
  padding: 0;
  background: #000;
  z-index: 60;
}

#editor { z-index: 70; }
#docsView { z-index: 50; }
#settingsView { z-index: 80; }

/* Documents view */
.docs-topbar {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  align-items: center;
  flex: none;
}

.docs-search {
  flex: 1;
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.7rem 0.9rem;
  font-size: 0.9rem;
  outline: none;
}

.docs-search:focus { border-color: var(--accent); }

.docs-list {
  flex: 1;
  overflow-y: auto;
  padding: 0 1rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.docs-list:empty::after {
  content: "No documents yet. Scan and upload to get started.";
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
  padding: 3rem 1rem;
}

.doc-item {
  display: flex;
  gap: 0.75rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem;
  cursor: pointer;
  align-items: stretch;
}

.doc-item:active { transform: scale(0.99); }

.doc-info {
  flex: 1;
  min-width: 0;
}

.doc-info .doc-title {
  font-weight: 600;
  font-size: 0.95rem;
  margin: 0 0 0.25rem;
}

.doc-info .doc-summary {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0 0 0.4rem;
}

.doc-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.doc-tag {
  background: var(--border);
  color: var(--muted);
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-weight: 500;
}


.doc-thumb-wrap {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.doc-thumb {
  width: 98px;
  height: 128px;
  border-radius: 6px;
  background: #222;
  overflow: hidden;
}

.doc-thumb-date {
  font-size: 0.7rem;
  color: var(--muted);
  white-space: nowrap;
}

.doc-thumb img {
  width: 100%;
  height: 100%;
  border-radius: 6px;
  display: block;
  object-fit: cover;
  object-position: top left;
}


/* Settings */
.settings-inner {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: center;
  padding: 2rem;
  gap: 1rem;
  max-width: 400px;
  margin: 0 auto;
  width: 100%;
}

.settings-inner h2 {
  margin: 0;
  text-align: center;
}

.settings-input {
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.8rem;
  font-size: 1rem;
  outline: none;
}

.settings-input:focus { border-color: var(--accent); }

.settings-inner .actions {
  display: flex;
  gap: 0.5rem;
}

.settings-inner .actions button { flex: 1; }

/* Upload toast on viewer */
.upload-status {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  z-index: 20;
  color: white;
  font-weight: 500;
}

.upload-status .spinner {
  width: 32px;
  height: 32px;
  border: 3px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* Pull to refresh */
.pull-indicator {
  position: absolute;
  top: env(safe-area-inset-top);
  left: 0;
  right: 0;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--card);
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  transform: translateY(-100%);
  z-index: 10;
  pointer-events: none;
}

.pull-indicator.smooth {
  transition: transform 220ms ease;
}

.pull-indicator.active {
  color: var(--accent);
}

.pull-indicator.busy::after {
  content: "";
  display: inline-block;
  width: 14px;
  height: 14px;
  margin-left: 0.6rem;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  vertical-align: middle;
}

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

/* Empty state */
.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 2rem;
  text-align: center;
}

.empty-state h1 { margin: 0; font-size: 2rem; letter-spacing: -0.02em; line-height: 1; }
.empty-state p { margin: 0; color: var(--muted); }
.empty-state .primary, .empty-state .success { min-width: 200px; }
.title-block {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
}
.title-block .version {
  font-size: 0.78rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}
.empty-state .status-msg {
  font-size: 0.8rem;
  min-height: 1.1em;
}
.empty-state .status-msg:empty { visibility: hidden; }

/* Library viewer */
#viewerWrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.viewer-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  gap: 0.5rem;
  flex: none;
}

.chip-btn {
  padding: 0.55rem 1rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  flex: none;
}

.chip-label {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.viewer-stage {
  flex: 1;
  min-height: 0;
  position: relative;
  overflow: hidden;
  background: #000;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.slide-track {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  display: flex;
  will-change: transform;
}

.slide-track.animating {
  transition: transform 280ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.slide {
  flex: none;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 0.5rem;
}

.slide canvas {
  max-width: 100%;
  max-height: 100%;
  display: block;
  user-select: none;
  -webkit-user-drag: none;
}

#slideCurr {
  transform-origin: center center;
  will-change: transform;
}

.viewer-hint {
  position: absolute;
  bottom: 0.75rem;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.6);
  color: rgba(255, 255, 255, 0.85);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.75rem;
  pointer-events: none;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: opacity 300ms ease;
}

.viewer-hint.hidden { opacity: 0; }

.viewer-actions {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.35rem;
  padding: 0.75rem 0.75rem;
  flex: none;
}

.viewer-actions button {
  padding: 0.75rem 0.2rem;
  font-size: 0.78rem;
}

.viewer-toast {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.85);
  color: white;
  padding: 0.75rem 1.25rem;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 500;
  pointer-events: none;
  z-index: 10;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  animation: toastFade 1.6s ease-out forwards;
}

/* Camera — full-screen overlay */
#video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.camera-ui {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: env(safe-area-inset-top) 1rem calc(env(safe-area-inset-bottom) + 1.25rem);
  pointer-events: none;
}

.camera-ui > * { pointer-events: auto; }

.camera-top {
  padding: 0;
  display: flex;
  flex-direction: column;
}

.captured-strip {
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  padding: 0;
  scrollbar-width: none;
}

.captured-strip::-webkit-scrollbar { display: none; }
.captured-strip:empty { display: none; }

.captured-strip canvas {
  height: 64px;
  width: auto;
  border-radius: 4px;
  border: 2px solid rgba(255, 255, 255, 0.9);
  background: #fff;
  flex: none;
  display: block;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
  cursor: pointer;
  touch-action: manipulation;
}

.captured-strip canvas:active { transform: scale(0.95); }

.camera-bottom {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 0.5rem;
  padding: 0 0.5rem;
}

.camera-slot { visibility: hidden; }

.shutter {
  flex: none;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: white;
  border: 4px solid rgba(255, 255, 255, 0.5);
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.9) inset;
  padding: 0;
  justify-self: center;
}

.shutter:active { transform: scale(0.93); }

.done-btn {
  flex: none;
  justify-self: end;
  width: auto;
  min-width: 80px;
  background: rgba(0, 0, 0, 0.6);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.camera-flash {
  position: absolute;
  inset: 0;
  background: #fff;
  pointer-events: none;
  animation: flashFade 220ms ease-out;
}

@keyframes flashFade {
  from { opacity: 0.9; }
  to { opacity: 0; }
}

.camera-toast {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.82);
  color: white;
  padding: 0.75rem 1.25rem;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 500;
  pointer-events: none;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  animation: toastFade 1.6s ease-out forwards;
}

@keyframes toastFade {
  0% { opacity: 0; }
  10% { opacity: 1; }
  85% { opacity: 1; }
  100% { opacity: 0; }
}

/* Editor */
.editor-top {
  padding: 0.75rem 1rem 0;
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
  text-align: center;
}

.editor-stage {
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  overflow: hidden;
}

#editorCanvas {
  max-width: 100%;
  max-height: 100%;
  display: block;
  touch-action: none;
  border-radius: 8px;
}

.editor-actions {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
}

.editor-actions button {
  flex: 1;
}

/* ---------- PDF viewer ---------- */

.pdf-topbar {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  align-items: flex-start;
  flex: none;
}

.pdf-topbar .chip-btn {
  font-size: 1.2rem;
  line-height: 1;
  padding: 0.4rem 0.7rem;
  flex-shrink: 0;
}

.pdf-title {
  flex: 1;
  font-weight: 600;
  font-size: 1.15rem;
  line-height: 1.3;
}

.pdf-topbar .chip-label {
  flex-shrink: 0;
  white-space: nowrap;
}

.pdf-pages {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem;
  background: #111;
}

.pdf-pages canvas {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
}

/* ---------- PDF fullscreen page ---------- */

.pdf-fullscreen {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: #000;
  display: flex;
  flex-direction: column;
}

.pdf-fullscreen-topbar {
  position: absolute;
  top: env(safe-area-inset-top);
  right: 0.75rem;
  z-index: 101;
}

.pdf-fullscreen-topbar .chip-btn {
  font-size: 1.2rem;
  padding: 0.4rem 0.7rem;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.pdf-fullscreen-scroll {
  flex: 1;
  overflow: hidden;
  position: relative;
  touch-action: none;
}

.pdf-fullscreen-scroll canvas {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
}