/* RAG-cut Design System — ui-ux-pro-max: Accessible & Ethical + Tech SaaS */

:root {
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-secondary: #3b82f6;
  --color-cta: #f97316;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-text-subtle: #94a3b8;
  --color-success: #16a34a;
  --color-error: #dc2626;
  --color-focus: #2563eb;
  --color-chunk-active: #eff6ff;
  --color-chunk-border: #93c5fd;

  --font-heading: "Space Grotesk", system-ui, sans-serif;
  --font-body: "DM Sans", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;

  --transition: 180ms ease;
  --header-h: 64px;
  --sidebar-w: 300px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.5;
  min-height: 100dvh;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 1000;
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
}
.skip-link:focus { top: var(--space-2); }

/* Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  padding: 0 var(--space-5);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.brand-icon { color: var(--color-primary); flex-shrink: 0; }

.brand h1 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-sub {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 500;
}
.badge-idle { background: #f1f5f9; color: var(--color-text-muted); }
.badge-loading { background: #fef3c7; color: #92400e; }
.badge-success { background: #dcfce7; color: #166534; }
.badge-error { background: #fee2e2; color: var(--color-error); }

/* Layout */
.app-layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: calc(100dvh - var(--header-h));
}

.config-panel {
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: var(--space-5);
  overflow-y: auto;
  max-height: calc(100dvh - var(--header-h));
}

.panel-section { margin-bottom: var(--space-5); }
.panel-section h2 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
}

/* Dropzone */
.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 140px;
  padding: var(--space-5);
  border: 2px dashed var(--color-border-strong);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  text-align: center;
}
.dropzone:hover, .dropzone:focus-visible, .dropzone.dragover {
  border-color: var(--color-primary);
  background: #eff6ff;
  outline: none;
}
.dropzone:focus-visible { box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.35); }
.dropzone svg { color: var(--color-text-subtle); }
.dropzone-title { margin: 0; font-weight: 600; font-size: 0.9375rem; }
.dropzone-hint { margin: 0; font-size: 0.8125rem; color: var(--color-text-muted); }
.dropzone-file { margin: var(--space-2) 0 0; font-size: 0.8125rem; color: var(--color-primary); font-weight: 500; word-break: break-all; }

/* Form */
.config-form { display: flex; flex-direction: column; gap: var(--space-3); }
.field { display: flex; flex-direction: column; gap: var(--space-1); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); }
.field label { font-size: 0.8125rem; font-weight: 500; color: var(--color-text); }
.field input, .field select {
  height: 44px;
  padding: 0 var(--space-3);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.field input:focus, .field select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}
.helper { font-size: 0.75rem; color: var(--color-text-muted); }
.mode-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.hidden { display: none !important; }

.auto-policy {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: #f8fafc;
}
.auto-policy-kicker {
  display: inline-flex;
  width: fit-content;
  padding: 2px 6px;
  border-radius: 4px;
  background: #dbeafe;
  color: #1e40af;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0;
}
.auto-policy-title {
  margin: var(--space-2) 0 0;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
}
.auto-policy-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
  margin: 0;
}
.auto-policy-grid div {
  min-width: 0;
  padding: var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}
.auto-policy-grid dt {
  margin: 0;
  font-size: 0.6875rem;
  color: var(--color-text-muted);
}
.auto-policy-grid dd {
  margin: 2px 0 0;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text);
  word-break: break-word;
}

/* Button */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: 0 var(--space-4);
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), opacity var(--transition), transform 80ms ease;
}
.btn:active:not(:disabled) { transform: scale(0.98); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--color-primary); color: #fff; width: 100%; }
.btn-primary:hover:not(:disabled) { background: var(--color-primary-hover); }
.btn-primary:focus-visible { outline: none; box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.4); }

.btn-spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  margin: 0;
}
.stats-grid div {
  padding: var(--space-3);
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}
.stats-grid dt { margin: 0; font-size: 0.75rem; color: var(--color-text-muted); }
.stats-grid dd { margin: var(--space-1) 0 0; font-family: var(--font-heading); font-size: 1.125rem; font-weight: 600; }
.mono { font-family: var(--font-mono); font-size: 0.75rem !important; word-break: break-all; }

/* History */
.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}
.history-header h2 { margin: 0; }
.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  width: auto;
  min-height: 32px;
  padding: 0 var(--space-3);
  font-size: 0.8125rem;
  font-weight: 500;
}
.btn-ghost:hover:not(:disabled) {
  background: var(--color-bg);
  color: var(--color-text);
  border-color: var(--color-border-strong);
}
.btn-sm { min-height: 32px; }
.history-hint {
  margin: 0 0 var(--space-2);
  font-size: 0.75rem;
  color: var(--color-text-muted);
}
.history-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-height: 280px;
  overflow-y: auto;
}
.history-item {
  display: flex;
  align-items: stretch;
  gap: var(--space-1);
  width: 100%;
  padding: var(--space-1);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color var(--transition), background var(--transition);
}
.history-item:hover {
  border-color: var(--color-chunk-border);
  background: var(--color-chunk-active);
}
.history-item.active {
  border-color: var(--color-primary);
  background: var(--color-chunk-active);
  box-shadow: inset 3px 0 0 var(--color-primary);
}
.history-item-load {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: var(--space-2);
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-body);
  color: inherit;
}
.history-item-delete {
  flex-shrink: 0;
  align-self: center;
  margin-right: var(--space-1);
  min-height: 28px;
  padding: 0 var(--space-2);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-muted);
  font-family: var(--font-body);
  font-size: 0.75rem;
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.history-item-delete:hover {
  color: #b42318;
  border-color: #fecdca;
  background: #fef3f2;
}
.history-item-name {
  font-size: 0.8125rem;
  font-weight: 600;
  word-break: break-all;
  line-height: 1.35;
}
.history-item-meta {
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

/* Workspace */
.workspace {
  padding: var(--space-5);
  overflow-y: auto;
  max-height: calc(100dvh - var(--header-h));
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  min-height: 0;
}

.workspace:has(#workspacePane:not(.hidden)) {
  overflow: hidden;
}

.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-6);
  color: var(--color-text-muted);
}
.empty-state svg { color: var(--color-border-strong); margin-bottom: var(--space-4); }
.empty-state h2 { margin: 0 0 var(--space-2); font-family: var(--font-heading); color: var(--color-text); }
.empty-state p { max-width: 420px; margin: 0; }

/* Workspace panes: original | chunk list | preview */
.workspace-pane {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.95fr) minmax(0, 1.15fr);
  gap: var(--space-4);
  flex: 1;
  min-height: 0;
}

.pane {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  min-height: 0;
  max-height: 100%;
}

.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}
.pane-header h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 600;
}
.pane-tag {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-surface);
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
}

.pane-body {
  flex: 1;
  overflow: auto;
  padding: var(--space-4);
  min-height: 0;
}
.placeholder { color: var(--color-text-muted); font-size: 0.9375rem; }

/* Original preview */
.original-docx { font-size: 0.9375rem; line-height: 1.6; }
.original-docx img { max-width: 100%; height: auto; border-radius: var(--radius-sm); }
.original-pdf { width: 100%; height: 100%; min-height: 240px; border: none; }
.original-text {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--color-text);
}
.original-image { max-width: 100%; border-radius: var(--radius-sm); }

/* Chunk list */
.chunk-list { padding: var(--space-2); display: flex; flex-direction: column; gap: var(--space-2); }

.chunk-card {
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
  text-align: left;
  width: 100%;
  font-family: inherit;
}
.chunk-card:hover {
  border-color: var(--color-chunk-border);
  background: #f8fafc;
}
.chunk-card:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.25);
}
.chunk-card.active {
  border-color: var(--color-primary);
  background: var(--color-chunk-active);
  box-shadow: var(--shadow-sm);
}

.chunk-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}
.chunk-index {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--color-primary);
}
.chunk-meta { font-size: 0.75rem; color: var(--color-text-muted); }

.chunk-types {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-bottom: var(--space-2);
}
.type-tag {
  font-size: 0.6875rem;
  font-weight: 500;
  padding: 2px 6px;
  border-radius: 4px;
  background: #f1f5f9;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.type-tag-heading { background: #dbeafe; color: #1e40af; }
.type-tag-image { background: #fce7f3; color: #9d174d; }
.type-tag-table { background: #d1fae5; color: #065f46; }
.type-tag-preview-only { background: #fef3c7; color: #92400e; }

.chunk-snippet {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Markdown preview (right pane) */
.pane-preview .markdown-body {
  font-size: 0.9375rem;
  line-height: 1.65;
  max-width: 75ch;
}
.markdown-body h1, .markdown-body h2, .markdown-body h3 {
  font-family: var(--font-heading);
  margin: 1.25em 0 0.5em;
  line-height: 1.3;
}
.markdown-body h1 { font-size: 1.375rem; }
.markdown-body h2 { font-size: 1.125rem; }
.markdown-body h3 { font-size: 1rem; }
.markdown-body p { margin: 0.75em 0; }
.markdown-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  margin: var(--space-3) 0;
}
.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  margin: var(--space-3) 0;
}
.markdown-body th, .markdown-body td {
  border: 1px solid var(--color-border);
  padding: var(--space-2) var(--space-3);
  text-align: left;
}
.markdown-body th { background: var(--color-bg); font-weight: 600; }
.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: #f1f5f9;
  padding: 2px 6px;
  border-radius: 4px;
}

/* Structured chunk blocks — images at original layout positions */
.chunk-blocks {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.chunk-block-image {
  margin: 0;
  padding: var(--space-3);
  background: #f8fafc;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.chunk-block-image img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  margin: var(--space-2) 0;
}
.chunk-block-image .block-context {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}
.chunk-block-image .ocr-caption {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-top: var(--space-2);
  line-height: 1.45;
}
.block-meta {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-text-subtle);
  margin-top: var(--space-1);
}
.chunk-block-heading {
  margin: var(--space-2) 0 var(--space-1);
  font-family: var(--font-heading);
}
.chunk-block-paragraph p {
  margin: 0;
  line-height: 1.6;
}
.chunk-block-table {
  overflow-x: auto;
  padding: var(--space-3);
  background: #f8fafc;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.chunk-block-table .table-screenshot {
  margin: 0 0 var(--space-3);
}
.chunk-block-table .table-screenshot img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}
.chunk-block-table .table-markdown {
  overflow-x: auto;
}
.chunk-block-table .table-footnote {
  margin-top: var(--space-2);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.api-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}

.recall-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}
.recall-panel summary {
  cursor: pointer;
  font-weight: 600;
  font-family: var(--font-heading);
}
.recall-form {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) 100px 140px;
  align-items: end;
  gap: var(--space-3);
  margin-top: var(--space-4);
}
.recall-form .field span { font-size: 0.8125rem; font-weight: 500; }
.recall-submit { width: auto; }
.recall-hint { margin: var(--space-3) 0; font-size: 0.8125rem; color: var(--color-text-muted); }
.recall-results { display: flex; flex-direction: column; gap: var(--space-2); }
.recall-result {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr) 64px;
  gap: var(--space-3);
  align-items: start;
  width: 100%;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  text-align: left;
  cursor: pointer;
}
.recall-result:hover { border-color: var(--color-primary); background: #f8fafc; }
.recall-result-main { display: flex; flex-direction: column; gap: var(--space-1); min-width: 0; }
.recall-result-main span { color: var(--color-text-muted); font-size: 0.8125rem; line-height: 1.4; }
.recall-rank, .recall-score { font-family: var(--font-mono); font-size: 0.75rem; color: var(--color-primary); }
.recall-score { text-align: right; }
.api-panel summary {
  cursor: pointer;
  font-weight: 600;
  font-family: var(--font-heading);
  padding: var(--space-1) 0;
}
.api-panel summary:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; }
.api-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-top: var(--space-4);
}
.api-grid h3 { margin: 0 0 var(--space-2); font-size: 0.8125rem; color: var(--color-text-muted); text-transform: uppercase; }
.code-block {
  margin: 0;
  padding: var(--space-3);
  background: #0f172a;
  color: #e2e8f0;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.5;
  overflow: auto;
  max-height: 280px;
  white-space: pre-wrap;
  word-break: break-word;
}

/* Responsive */
@media (max-width: 1024px) {
  .app-layout { grid-template-columns: 1fr; }
  .config-panel {
    max-height: none;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }
  .workspace-pane { grid-template-columns: 1fr; height: auto; }
  .workspace-pane .pane { max-height: 420px; }
  .api-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .app-header { padding: 0 var(--space-4); }
  .workspace { padding: var(--space-4); }
  .field-row { grid-template-columns: 1fr; }
  .recall-form { grid-template-columns: 1fr; }
}