/* ── Reset & custom properties ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
/* Ensure author-level display rules don't override the hidden attribute */
[hidden] { display: none !important; }

:root {
  --color-header:          #1a1a2e;
  --color-header-text:     #ffffff;
  --color-primary:         #2563eb;
  --color-primary-hover:   #1d4ed8;
  --color-bg:              #f9fafb;
  --color-surface:         #ffffff;
  --color-border:          #e5e7eb;
  --color-muted:           #6b7280;
  --color-muted-light:     #94a3b8;

  --color-success:         #15803d;
  --color-success-bg:      #f0fdf4;
  --color-success-border:  #bbf7d0;
  --color-warning:         #b45309;
  --color-warning-bg:      #fffbeb;
  --color-warning-border:  #fde68a;
  --color-error:           #dc2626;
  --color-error-bg:        #fef2f2;
  --color-error-border:    #fecaca;

  --color-drop-border:     #cbd5e1;
  --color-drop-bg:         #f8faff;
  --color-drop-hover:      #eff6ff;
  --color-drop-border-hover: #93c5fd;

  --color-badge-checkbox:  #dbeafe;
  --color-badge-radio:     #ede9fe;
  --color-badge-text:      #dbeafe;
  --color-badge-area:      #fef3c7;

  --font:    -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --radius:  8px;
  --sp-xs:   4px;
  --sp-sm:   8px;
  --sp-md:   16px;
  --sp-lg:   24px;
  --sp-xl:   32px;
}

body {
  font-family: var(--font);
  font-size: 14px;
  background: var(--color-bg);
  color: #1e293b;
  min-height: 100dvh;
}

/* ── App shell ───────────────────────────────────────────────────────────── */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  max-width: 600px;
  margin: 0 auto;
}

/* ── Layout mode ─────────────────────────────────────────────────────────────── */
.app--large    { max-width: 900px; }
.app--fullscreen { max-width: 100%; }

.layout-btns {
  display: flex;
  gap: 2px;
  margin-left: auto;
}
.layout-btn {
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: var(--color-header-text);
  border-radius: 4px;
  padding: 3px 8px;
  font-size: 13px;
  cursor: pointer;
  line-height: 1;
  opacity: 0.6;
  transition: opacity 0.15s, background 0.15s;
}
.layout-btn:hover  { opacity: 1; }
.layout-btn--active {
  background: rgba(255, 255, 255, 0.2);
  opacity: 1;
}

/* ── Editor panel ────────────────────────────────────────────────────────── */
.tab-panel--editor-mode {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  padding: 0;
}

.tab-panels {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.tab-panel--active {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}

/* Override static tab panels back to block layout when not editor */
#panel-how.tab-panel--active,
#panel-markers.tab-panel--active,
#panel-faq.tab-panel--active {
  display: block;
  padding: var(--sp-md);
  overflow-y: auto;
}
/* Tool panel needs flex — higher specificity than the base .tab-panel { display: none } rule */
#panel-tool.tab-panel--active { display: flex; }

/* When the editor is active, lock the app to viewport height so only editor-canvas-wrap scrolls */
body:has(#panel-tool.tab-panel--editor-mode) { overflow: hidden; }
body:has(#panel-tool.tab-panel--editor-mode) .app { height: 100dvh; overflow: hidden; }

.editor-panel {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}

.editor-toolbar {
  display: flex;
  gap: var(--sp-xs);
  padding: var(--sp-sm) var(--sp-md);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
  flex-wrap: wrap;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 15;
}

.tool-btn {
  padding: 5px 10px;
  border-radius: 5px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  color: #374151;
  transition: background 0.1s, border-color 0.1s;
}
.tool-btn:hover        { background: var(--color-bg); }
.tool-btn--active      { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.tool-btn--group       { margin-left: auto; background: #7c3aed; color: #fff; border-color: #7c3aed; }
.tool-btn--sm { font-size: 11px; padding: 2px 5px; min-width: 28px; }

/* Align wrap: inline with field-type buttons, separated by a vertical rule */
.toolbar-align-wrap {
  display: flex;
  align-items: center;
  gap: var(--sp-xs);
  border-left: 1px solid var(--color-border);
  padding-left: var(--sp-xs);
  margin-left: var(--sp-xs);
}
/* Each group inside the wrap row */
.toolbar-align {
  display: flex;
  gap: 2px;
  align-items: center;
}
/* Visual separator between the two groups when both are visible */
.toolbar-align + .toolbar-align:not([hidden]) {
  border-left: 1px solid var(--color-border);
  padding-left: var(--sp-xs);
  margin-left: 2px;
}

/* ── Page indicator ──────────────────────────────────────────────────────── */
.page-indicator {
  position: absolute;
  bottom: 6px;
  right: 6px;
  background: rgba(0, 0, 0, 0.45);
  color: #fff;
  border-radius: 4px;
  padding: 2px 6px;
  display: flex;
  align-items: center;
  gap: 4px;
  z-index: 14;
  font-size: 11px;
  pointer-events: auto;
  user-select: none;
}
.page-indicator__input {
  width: 28px;
  background: transparent;
  color: #fff;
  border: none;
  font-size: 11px;
  text-align: center;
  padding: 0;
  -moz-appearance: textfield;
}
.page-indicator__input::-webkit-outer-spin-button,
.page-indicator__input::-webkit-inner-spin-button { -webkit-appearance: none; }
.page-indicator__input:focus {
  outline: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.15);
}
.page-indicator__total { opacity: 0.75; white-space: nowrap; }

.editor-zero-banner {
  width: 100%;
  max-width: 560px;
  flex-shrink: 0;
}

.editor-canvas-wrap {
  flex: 1;
  overflow-y: auto;
  overflow-x: auto;
  background: #d1d5db;
  padding: var(--sp-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-md);
  min-height: 0;
  position: relative;
}

.drag-select-rect {
  position: absolute;
  border: 1px solid #2563eb;
  background: rgba(37, 99, 235, 0.08);
  pointer-events: none;
  z-index: 25;
}

.editor-bottom-bar {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  padding: var(--sp-sm) var(--sp-md);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  flex-shrink: 0;
}
.editor-bottom-bar .btn--primary { flex: 1; width: auto; }

/* ── Editor page ─────────────────────────────────────────────────────────── */
.editor-page {
  position: relative;
  background: #e0e0e0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
  flex-shrink: 0;
  overflow: visible;
}

.editor-page__img {
  display: block;
  width: 100%;
  height: auto;
  pointer-events: none;
  user-select: none;
}

/* ── Field overlays ──────────────────────────────────────────────────────── */
.field-overlay {
  position: absolute;
  box-sizing: border-box;
  cursor: move;
  user-select: none;
  border: 1.5px solid #2563eb;
  background: rgba(37, 99, 235, 0.07);
}
.field-overlay--radio,
.field-overlay--checkbox {
  border-color: #7c3aed;
  background: rgba(124, 58, 237, 0.1);
  cursor: default;
}
.field-overlay--marker {
  border-color: #0891b2;
  background: rgba(8, 145, 178, 0.08);
}
.field-overlay--selected {
  border-color: #1d4ed8 !important;
  outline: 2px solid rgba(37, 99, 235, 0.35);
  z-index: 10;
}

.field-delete-btn {
  position: absolute;
  top: -8px;
  right: -8px;
  width: 16px;
  height: 16px;
  background: #dc2626;
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 11px;
  line-height: 16px;
  text-align: center;
  cursor: pointer;
  display: none;
  z-index: 11;
  padding: 0;
}
.field-overlay--selected .field-delete-btn { display: block; }

/* ── Resize handles ──────────────────────────────────────────────────────────── */
.resize-handle {
  display: none;
  position: absolute;
  width: 8px;
  height: 8px;
  background: #2563eb;
  border: 1px solid #fff;
  border-radius: 2px;
  z-index: 12;
}
.field-overlay--selected .resize-handle { display: block; }
.resize-handle--e  { cursor: ew-resize;   right: -4px;  top: 50%;  transform: translateY(-50%); }
.resize-handle--w  { cursor: ew-resize;   left: -4px;   top: 50%;  transform: translateY(-50%); }
.resize-handle--n  { cursor: ns-resize;   top: -4px;    left: 50%; transform: translateX(-50%); }
.resize-handle--s  { cursor: ns-resize;   bottom: -4px; left: 50%; transform: translateX(-50%); }
.resize-handle--ne { cursor: nesw-resize; top: -4px;    right: -4px; }
.resize-handle--nw { cursor: nwse-resize; top: -4px;    left: -4px; }
.resize-handle--se { cursor: nwse-resize; bottom: -4px; right: -4px; }
.resize-handle--sw { cursor: nesw-resize; bottom: -4px; left: -4px; }

/* ── Multi-select + radio group popover ─────────────────────────────────── */
.field-overlay--multi-selected {
  border-color: #7c3aed !important;
  outline: 2px solid rgba(124, 58, 237, 0.35);
  z-index: 9;
}

.radio-group-popover {
  position: absolute;
  bottom: calc(100% + 4px);
  left: 0;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 4px 6px;
  display: flex;
  align-items: center;
  gap: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  z-index: 20;
  white-space: nowrap;
}
.radio-group-popover label { font-size: 11px; color: var(--color-muted); }
.radio-group-popover input {
  width: 80px;
  font-size: 11px;
  padding: 2px 4px;
  border: 1px solid var(--color-border);
  border-radius: 3px;
}

/* ── Header ──────────────────────────────────────────────────────────────── */
.app-header {
  background: var(--color-header);
  color: var(--color-header-text);
  padding: var(--sp-sm) var(--sp-md);
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  flex-shrink: 0;
}
.app-header__icon { font-size: 22px; line-height: 1; }
.app-header__title {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.2px;
}
.app-header__tagline {
  font-size: 10px;
  color: #a0a0c0;
  margin-top: 1px;
}

/* ── Tab navigation ──────────────────────────────────────────────────────── */
.tab-nav {
  display: flex;
  border-bottom: 2px solid var(--color-border);
  background: var(--color-surface);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  flex-shrink: 0;
}
.tab-nav::-webkit-scrollbar { display: none; }

.tab-btn {
  flex: 1;
  min-width: 70px;
  padding: var(--sp-sm) var(--sp-xs);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-muted);
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s, border-color 0.15s;
}
.tab-btn:hover { color: var(--color-primary); }
.tab-btn--active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  background: var(--color-surface);
}

/* ── Tab panels ──────────────────────────────────────────────────────────── */

.tab-panel {
  display: none;
  padding: var(--sp-md);
}

/* ── Drop zone ───────────────────────────────────────────────────────────── */
.drop-zone {
  border: 2px dashed var(--color-drop-border);
  border-radius: var(--radius);
  padding: 36px var(--sp-md);
  text-align: center;
  background: var(--color-drop-bg);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  position: relative;
}
.drop-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}
.drop-zone:hover,
.drop-zone--active {
  border-color: var(--color-drop-border-hover);
  background: var(--color-drop-hover);
}
.drop-zone--disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}
.drop-zone__icon   { font-size: 32px; margin-bottom: var(--sp-sm); }
.drop-zone__title  { font-weight: 600; font-size: 14px; color: #1e293b; margin-bottom: 4px; }
.drop-zone__hint   { font-size: 12px; color: var(--color-muted-light); }
.drop-zone__note   { margin-top: var(--sp-sm); font-size: 11px; color: var(--color-muted-light); }

/* ── Processing state ────────────────────────────────────────────────────── */
.processing-state {
  text-align: center;
  padding: var(--sp-xl) var(--sp-md);
}
@keyframes spin { to { transform: rotate(360deg); } }
.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto var(--sp-md);
}
.processing-state__text { font-size: 14px; color: var(--color-muted); }

/* ── Banners ─────────────────────────────────────────────────────────────── */
.banner {
  border-radius: var(--radius);
  padding: var(--sp-sm) var(--sp-md);
  margin-bottom: var(--sp-md);
  font-size: 13px;
  font-weight: 600;
}
.banner--success {
  background: var(--color-success-bg);
  border: 1px solid var(--color-success-border);
  color: var(--color-success);
}
.banner--warning {
  background: var(--color-warning-bg);
  border: 1px solid var(--color-warning-border);
  color: var(--color-warning);
}
.banner--error {
  background: var(--color-error-bg);
  border: 1px solid var(--color-error-border);
  color: var(--color-error);
}

/* ── Size warning (50MB gate) ────────────────────────────────────────────── */
.size-warning {
  border: 1px solid var(--color-warning-border);
  background: var(--color-warning-bg);
  border-radius: var(--radius);
  padding: var(--sp-md);
}
.size-warning__text {
  font-size: 13px;
  color: var(--color-warning);
  margin-bottom: var(--sp-sm);
}
.size-warning__actions { display: flex; gap: var(--sp-sm); }

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-block;
  padding: 9px var(--sp-md);
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background 0.15s;
  text-align: center;
}
.btn--primary {
  background: var(--color-primary);
  color: #fff;
  width: 100%;
}
.btn--primary:hover { background: var(--color-primary-hover); }
.btn--secondary {
  background: var(--color-surface);
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  flex: 1;
}
.btn--secondary:hover { background: var(--color-bg); }
.btn--full { width: 100%; }
.error-actions { padding: var(--sp-md) 0; }
.btn--proceed {
  background: var(--color-warning);
  color: #fff;
  flex: 1;
}
.btn--proceed:hover { opacity: 0.9; }
.btn-link {
  background: none;
  border: none;
  color: var(--color-primary);
  font-size: 12px;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
}

/* ── Result card ─────────────────────────────────────────────────────────── */
.result-card { margin-bottom: var(--sp-md); }

/* ── Result split action ──────────────────────────────────────────────────── */
.result-actions {
  display: flex;
  gap: var(--sp-sm);
  margin-bottom: var(--sp-sm);
}
.result-actions .btn--primary { flex: 1; width: auto; }
.result-actions .btn--secondary { flex: 1; }

.result-card__reset {
  text-align: center;
  margin-top: var(--sp-sm);
  font-size: 11px;
  color: var(--color-muted-light);
  cursor: pointer;
}
.result-card__reset:hover { color: var(--color-primary); }

/* Small tier — field list */
.field-list { margin-bottom: var(--sp-md); }
.field-list__page-label {
  font-size: 11px;
  font-weight: 700;
  color: #374151;
  margin: var(--sp-sm) 0 var(--sp-xs);
}
.field-list__item {
  display: flex;
  align-items: center;
  gap: var(--sp-xs);
  padding: 2px 0;
  font-size: 12px;
}
.field-list__label { color: var(--color-muted); font-size: 11px; }

/* Medium tier — per-page rows */
.page-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 5px var(--sp-sm);
  background: #f8fafc;
  border-radius: 4px;
  margin-bottom: 4px;
  font-size: 12px;
}
.page-row__label { color: #374151; }
.page-row__badges { display: flex; gap: var(--sp-xs); }

/* Large tier — big count badges */
.count-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-sm);
  margin-bottom: var(--sp-md);
}
.count-badge {
  padding: 5px var(--sp-sm);
  border-radius: 5px;
  font-size: 12px;
  font-weight: 600;
}

/* Field type badges */
.badge {
  display: inline-block;
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 10px;
  font-weight: 600;
  white-space: nowrap;
}
.badge--checkbox { background: var(--color-badge-checkbox); }
.badge--radio    { background: var(--color-badge-radio); }
.badge--text     { background: var(--color-badge-text); }
.badge--area     { background: var(--color-badge-area); }

/* ── Update banner ───────────────────────────────────────────────────────── */
.update-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: #1e293b;
  color: #e2e8f0;
  padding: var(--sp-sm) var(--sp-md);
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-sm);
  z-index: 100;
}
.update-banner[hidden] { display: none; }
.update-banner .btn-link { color: #93c5fd; font-size: 13px; }

/* ── Static tab content ──────────────────────────────────────────────────── */
.static-content h2 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: var(--sp-md);
  color: #1e293b;
}
.static-content h3 {
  font-size: 14px;
  font-weight: 700;
  margin: var(--sp-md) 0 var(--sp-sm);
  color: #374151;
}
.static-content p {
  font-size: 13px;
  color: #4b5563;
  line-height: 1.6;
  margin-bottom: var(--sp-sm);
}
.static-content ol, .static-content ul {
  padding-left: var(--sp-lg);
  font-size: 13px;
  color: #4b5563;
  line-height: 1.6;
}
.static-content li { margin-bottom: 4px; }

.marker-table { width: 100%; border-collapse: collapse; margin: var(--sp-sm) 0 var(--sp-md); }
.marker-table th, .marker-table td {
  text-align: left;
  padding: var(--sp-sm);
  font-size: 12px;
  border-bottom: 1px solid var(--color-border);
}
.marker-table th { font-weight: 700; color: #374151; background: var(--color-bg); }
.marker-table code {
  background: #f1f5f9;
  border-radius: 3px;
  padding: 1px 5px;
  font-family: monospace;
  font-size: 12px;
}

/* ── Footer ──────────────────────────────────────────────────────────────── */
.app-footer {
  text-align: center;
  padding: var(--sp-sm);
  font-size: 10px;
  color: var(--color-muted-light);
  flex-shrink: 0;
}

/* ── Responsive: wider screens ───────────────────────────────────────────── */
@media (min-width: 480px) {
  .tab-btn { font-size: 12px; padding: var(--sp-sm); }
  .drop-zone { padding: 48px var(--sp-lg); }
  .drop-zone__icon { font-size: 40px; }
}