/* ── Design Tokens ─────────────────────────────────────────────────────────── */
:root {
  --navy:       #1E3A5F;
  --blue:       #2E75B6;
  --blue-light: #4A90D9;
  --amber:      #E8A020;
  --amber-dark: #C47D0C;

  --white:      #FFFFFF;
  --card:       #FFFFFF;
  --page-bg:    #F7F9FC;
  --panel-bg:   #F0F4F8;
  --border:     #D4DCE8;
  --border-light: #E8EDF5;

  --text-primary:   #0F1F33;
  --text-secondary: #4A6080;
  --text-muted:     #8A9BB0;

  --success:  #16A34A;
  --success-bg: #DCFCE7;
  --warning:  #D97706;
  --warning-bg: #FEF3C7;
  --danger:   #DC2626;
  --danger-bg: #FEE2E2;

  --font-ui:   'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --radius-sm: 4px;
  --radius:    8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow:    0 4px 12px rgba(0,0,0,0.08), 0 1px 3px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);

  --header-h:   60px;
  --transition: 150ms ease;
}

/* ── Reset & Base ──────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 14px; }

body {
  font-family: var(--font-ui);
  background: var(--page-bg);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* ── Header ────────────────────────────────────────────────────────────────── */
.app-header {
  height: var(--header-h);
  background: var(--white);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  gap: 16px;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
  z-index: 100;
}

.header-left  { display: flex; align-items: center; gap: 16px; }
.header-right { display: flex; align-items: center; gap: 10px; }

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.logo-text {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.3px;
}
.logo-ai {
  color: var(--blue);
}
.tagline {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: none;
}
@media (min-width: 900px) { .tagline { display: block; } }

.model-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
}
.model-badge.sonnet { background: #EFF6FF; border-color: var(--blue); color: var(--blue); }

.export-group { display: flex; gap: 8px; }

/* ── Main Layout ────────────────────────────────────────────────────────────── */
.app-main {
  display: flex;
  flex: 1;
  overflow: hidden;
  gap: 0;
}

.pane {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

.pane-left {
  width: 55%;
  min-width: 400px;
  background: var(--panel-bg);
  border-right: 1px solid var(--border);
  flex-shrink: 0;
}

.pane-right {
  flex: 1;
  background: var(--white);
  overflow-y: auto;
}

/* ── Upload Zone ────────────────────────────────────────────────────────────── */
.upload-zone {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 40px 32px;
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  margin: 20px;
  background: var(--white);
  transition: border-color var(--transition), background var(--transition);
  cursor: pointer;
}
.upload-zone.drag-over {
  border-color: var(--blue);
  background: #EBF3FB;
}
.upload-icon { opacity: 0.6; }
.upload-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
}
.upload-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-align: center;
}

/* ── Preview ────────────────────────────────────────────────────────────────── */
.preview-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.preview-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: var(--white);
  border-bottom: 1px solid var(--border-light);
  flex-shrink: 0;
}
.preview-toolbar-left { display: flex; align-items: center; gap: 8px; }
.preview-toolbar-right { display: flex; align-items: center; gap: 8px; }

.zoom-label {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  min-width: 40px;
  text-align: center;
}

.preview-viewport {
  flex: 1;
  overflow: auto;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 16px;
  background: var(--panel-bg);
}

.preview-image, #previewCanvas {
  max-width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transform-origin: top center;
  transition: transform 0.2s ease;
}

.pdf-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 8px;
  background: var(--white);
  border-top: 1px solid var(--border-light);
  font-size: 0.82rem;
  color: var(--text-secondary);
  flex-shrink: 0;
}

/* ── Extract Bar ────────────────────────────────────────────────────────────── */
.extract-bar {
  padding: 12px 20px;
  background: var(--white);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* ── Loading ────────────────────────────────────────────────────────────────── */
.pane-loading {
  position: absolute;
  inset: 0;
  background: rgba(247,249,252,0.92);
  backdrop-filter: blur(4px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  z-index: 10;
}
.pane-loading p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Right Pane ─────────────────────────────────────────────────────────────── */
.right-empty {
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 40px;
  color: var(--text-muted);
  text-align: center;
}
.right-empty h3 { font-size: 1rem; font-weight: 600; color: var(--text-secondary); }
.right-empty p  { font-size: 0.85rem; }

.extraction-results { padding: 16px 20px 32px; }

/* ── Meta Bar ────────────────────────────────────────────────────────────────── */
.meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 16px;
  font-size: 0.78rem;
  color: var(--text-secondary);
}
.meta-pill {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: 12px;
}
.meta-pill.sonnet { border-color: var(--blue); color: var(--blue); }
.meta-pill .conf-high   { color: var(--success); }
.meta-pill .conf-medium { color: var(--warning); }
.meta-pill .conf-low    { color: var(--danger);  }

/* ── History Drawer ──────────────────────────────────────────────────────────── */
.history-drawer {
  position: fixed;
  top: var(--header-h);
  right: -340px;
  width: 340px;
  height: calc(100vh - var(--header-h));
  background: var(--white);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  z-index: 200;
  transition: right 0.25s ease;
  display: flex;
  flex-direction: column;
}
.history-drawer.open { right: 0; }

.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: 0.9rem;
  flex-shrink: 0;
}
.history-list {
  overflow-y: auto;
  flex: 1;
  padding: 8px;
}
.history-item {
  padding: 10px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  margin-bottom: 6px;
  cursor: pointer;
  transition: background var(--transition);
  background: var(--white);
}
.history-item:hover { background: var(--panel-bg); }
.history-item .inv-no  { font-weight: 600; font-size: 0.85rem; color: var(--text-primary); }
.history-item .inv-sub { font-size: 0.75rem; color: var(--text-muted); margin-top: 2px; }
.history-item .inv-amt { font-family: var(--font-mono); font-size: 0.82rem; color: var(--navy); font-weight: 600; }

/* ── Toast ───────────────────────────────────────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
}
.toast {
  padding: 10px 18px;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 500;
  box-shadow: var(--shadow);
  animation: toastIn 0.2s ease;
  white-space: nowrap;
}
.toast.success { background: var(--success-bg); color: #14532D; border: 1px solid #86EFAC; }
.toast.error   { background: var(--danger-bg);  color: #7F1D1D; border: 1px solid #FCA5A5; }
.toast.info    { background: #EFF6FF; color: var(--navy); border: 1px solid #BFDBFE; }
@keyframes toastIn { from { opacity:0; transform: translateY(8px); } to { opacity:1; transform: translateY(0); } }

/* ── Badge ────────────────────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  background: var(--blue);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 600;
  border-radius: 9px;
}

/* ── Utility ─────────────────────────────────────────────────────────────── */
.icon-sm { width: 14px; height: 14px; }
.empty-state { padding: 24px; text-align: center; color: var(--text-muted); font-size: 0.82rem; }

/* ── Pane Divider ────────────────────────────────────────────────────────── */
.pane-divider {
  width: 6px;
  background: var(--border-light);
  cursor: col-resize;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--transition);
  position: relative;
  z-index: 10;
}
.pane-divider:hover,
.pane-divider.dragging {
  background: var(--blue);
}
.pane-divider:hover .divider-handle,
.pane-divider.dragging .divider-handle {
  opacity: 1;
}
.divider-handle {
  width: 20px;
  height: 36px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
  box-shadow: var(--shadow-sm);
}
.divider-handle svg {
  width: 12px;
  height: 12px;
  color: var(--text-muted);
}
.pane-divider:hover .divider-handle { opacity: 1; }

/* ── History Overlay ─────────────────────────────────────────────────────── */
.history-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.2);
  z-index: 199;
}
.history-overlay.visible { display: block; }