:root {
  color-scheme: light;
  --bg: #f3f7ff;
  --surface: #ffffff;
  --surface-raised: #ffffff;
  --surface-soft: #f7faff;
  --surface-blue: #edf4ff;
  --border: #cfdbec;
  --text: #142033;
  --muted: #66738a;
  --accent: #0f5fc7;
  --accent-strong: #002b81;
  --accent-soft: #dcecff;
  --warn: #a4630d;
  --manual: #7b4264;
  --shadow: 0 18px 42px rgba(26, 55, 95, 0.09);
  --focus: rgba(15, 95, 199, 0.22);
  --danger-bg: #ffe9eb;
  --danger-text: #7b1d27;
  --success-bg: #def7eb;
  --success-text: #0d513a;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #071121;
  --surface: #0c1728;
  --surface-raised: #111f34;
  --surface-soft: #13223a;
  --surface-blue: #102849;
  --border: #263b5b;
  --text: #e8eef8;
  --muted: #9aa8bd;
  --accent: #61a5ff;
  --accent-strong: #9fc8ff;
  --accent-soft: #16345d;
  --warn: #f3b55d;
  --manual: #eaa0c4;
  --shadow: 0 18px 42px rgba(0, 0, 0, 0.32);
  --focus: rgba(97, 165, 255, 0.25);
  --danger-bg: #421b24;
  --danger-text: #ffc3ca;
  --success-bg: #133c2d;
  --success-text: #b9f2d2;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
select,
textarea {
  font: inherit;
}

.app-shell {
  width: min(1680px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 18px 0 24px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 12px;
}

.brand {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 14px;
}

.brand-logo {
  width: 50px;
  height: 42px;
  object-fit: contain;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #ffffff;
  padding: 6px;
  box-shadow: var(--shadow);
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 27px;
  line-height: 1.15;
  letter-spacing: 0;
}

h2 {
  font-size: 15px;
  line-height: 1.3;
}

.status {
  min-height: 22px;
  margin-top: 5px;
  color: var(--muted);
  font-size: 14px;
}

.header-actions,
.toolbar-controls,
.toolbar-edge,
.panel-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.header-actions {
  justify-content: flex-end;
}

.primary-toolbar {
  display: grid;
  grid-template-columns: minmax(170px, auto) minmax(0, 1fr) minmax(150px, auto);
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: linear-gradient(180deg, var(--surface-raised), var(--surface-soft));
  padding: 12px;
  box-shadow: var(--shadow);
}

.toolbar-controls {
  justify-content: center;
}

.toolbar-edge-right {
  justify-content: flex-end;
}

.viewbar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  padding: 10px 12px;
  color: var(--muted);
  font-size: 13px;
  box-shadow: 0 8px 22px rgba(26, 55, 95, 0.05);
}

.viewbar span {
  color: var(--text);
  font-weight: 700;
}

.range-status {
  color: var(--muted);
  font-weight: 650;
}

.viewbar label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 30px;
}

.viewbar input,
.switch-label input {
  accent-color: var(--accent);
}

.field-label,
.switch-label,
.auto-toggle {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  gap: 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  padding: 0 12px;
  color: var(--text);
  font-size: 14px;
}

.field-label {
  padding: 6px 8px 6px 12px;
}

.field-label span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.field-label select {
  min-height: 30px;
  border-color: transparent;
  background: transparent;
  padding: 0 22px 0 2px;
}

.field-label.compact select {
  min-width: 76px;
}

.switch-label {
  cursor: pointer;
  user-select: none;
}

.file-upload {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  border: 1px solid var(--accent-strong);
  border-radius: 8px;
  background: var(--accent-strong);
  color: white;
  padding: 0 16px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 700;
  white-space: nowrap;
}

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

.file-upload input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.drop-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(245, 247, 250, 0.78);
  backdrop-filter: blur(3px);
  pointer-events: none;
}

.drop-overlay.visible {
  display: flex;
}

.drop-overlay div {
  width: min(520px, calc(100vw - 48px));
  border: 2px dashed var(--accent);
  border-radius: 8px;
  background: var(--surface);
  padding: 28px;
  text-align: center;
  box-shadow: var(--shadow);
}

.drop-overlay strong,
.drop-overlay span {
  display: block;
}

.drop-overlay strong {
  font-size: 20px;
  line-height: 1.25;
}

.drop-overlay span {
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
}

body.dragging-file .app-shell {
  outline: 3px solid var(--focus);
  outline-offset: -10px;
}

.auto-toggle input,
.switch-label input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

button,
select {
  min-height: 38px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  padding: 0 14px;
}

button {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
  color: white;
  cursor: pointer;
  font-weight: 650;
}

button:hover {
  background: var(--accent);
}

button.secondary {
  background: var(--surface);
  color: var(--accent-strong);
}

button.secondary:hover,
button.ghost:hover {
  background: var(--accent-soft);
}

button.ghost {
  min-height: 32px;
  border-color: var(--border);
  background: transparent;
  color: var(--accent-strong);
  white-space: nowrap;
}

button:disabled {
  cursor: wait;
  opacity: 0.65;
}

.workspace-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  min-height: 54vh;
}

.editor-pane {
  display: flex;
  min-height: 430px;
  flex-direction: column;
  gap: 8px;
}

.pane-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.pane-head span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}

.preview-toggle {
  min-height: 28px;
  padding: 0 10px;
  font-size: 12px;
}

.zoom-step {
  width: 34px;
  min-height: 34px;
  padding: 0;
  font-size: 18px;
  line-height: 1;
}

.zoom-buttons {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

textarea {
  width: 100%;
  min-height: 100%;
  flex: 1;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  padding: 16px;
  line-height: 1.55;
  box-shadow: var(--shadow);
}

textarea:focus,
select:focus,
button:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 1px;
}

.textarea-flash {
  animation: textarea-flash 900ms ease;
}

@keyframes textarea-flash {
  0% {
    box-shadow: 0 0 0 4px var(--focus), var(--shadow);
  }
  100% {
    box-shadow: var(--shadow);
  }
}

.compare-pane {
  display: flex;
  min-height: 430px;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  padding: 14px;
  box-shadow: var(--shadow);
}

.diff-stats {
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
}

.diff-view {
  flex: 1;
  min-height: 0;
  overflow: auto;
  margin-top: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-soft);
  padding: 14px;
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 13px;
  line-height: 1.65;
  white-space: pre-wrap;
}

.doc-preview {
  flex: 1;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--surface-blue) 72%, #9db3d4);
  padding: 12px;
  box-shadow: var(--shadow);
  --doc-zoom: 0.85;
}

.doc-page {
  width: 794px;
  min-height: 1123px;
  margin: 0 auto 14px;
  padding: 96px;
  background: #ffffff;
  color: #111827;
  box-shadow: 0 12px 28px rgba(24, 32, 47, 0.16);
  box-sizing: border-box;
  font-family: "Times New Roman", Times, serif;
  font-size: 12pt;
  line-height: 1.35;
  zoom: var(--doc-zoom);
}

.doc-page-number {
  float: right;
  margin: -42px -42px 12px 12px;
  color: #8b95a5;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 11px;
}

.doc-page p {
  margin: 0 0 8pt;
}

.doc-page table {
  width: 100%;
  border-collapse: collapse;
  margin: 10pt 0;
  table-layout: fixed;
}

.doc-page td,
.doc-page th {
  border: 1px solid #9ca3af;
  padding: 5pt 6pt;
  vertical-align: top;
  word-break: normal;
  overflow-wrap: anywhere;
}

.doc-image {
  display: inline-block;
  max-width: 100%;
  object-fit: contain;
  vertical-align: middle;
}

.doc-highlight {
  border-radius: 3px;
  background: #fff2a8;
  color: inherit;
  padding: 0 2px;
}

.doc-content-range {
  outline: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
  outline-offset: 2px;
  background: color-mix(in srgb, var(--accent-soft) 65%, transparent);
}

.doc-list-marker {
  display: inline-block;
  min-width: 28px;
  margin-right: 8px;
  text-align: right;
}

.range-menu {
  position: fixed;
  z-index: 100;
  display: grid;
  gap: 4px;
  width: 200px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  padding: 6px;
  box-shadow: var(--shadow);
}

.range-menu[hidden] {
  display: none;
}

.range-menu button {
  justify-content: flex-start;
  min-height: 32px;
  border-color: transparent;
  background: transparent;
  color: var(--text);
  text-align: left;
}

.range-menu button:hover {
  background: var(--accent-soft);
}

.diff-row {
  display: grid;
  grid-template-columns: 34px 20px minmax(0, 1fr);
  align-items: start;
  min-height: 22px;
  border-radius: 4px;
  cursor: pointer;
}

.diff-row + .diff-row {
  margin-top: 2px;
}

.diff-line,
.diff-sign {
  color: var(--muted);
  user-select: none;
  text-align: right;
}

.diff-sign {
  text-align: center;
}

.diff-row-text {
  min-width: 0;
  padding-left: 4px;
  white-space: pre-wrap;
  word-break: break-word;
}

.diff-row-del {
  background: var(--danger-bg);
  color: var(--danger-text);
}

.diff-row-del .diff-row-text {
  text-decoration: none;
}

.diff-row-ins {
  background: var(--success-bg);
  color: var(--success-text);
}

.diff-token-del,
.diff-token-ins {
  border-radius: 3px;
  padding: 1px 2px;
}

.diff-token-del {
  background: color-mix(in srgb, var(--danger-bg) 72%, #ff9aa3);
  color: var(--danger-text);
  text-decoration: line-through;
  text-decoration-thickness: 1px;
}

.diff-token-ins {
  background: color-mix(in srgb, var(--success-bg) 72%, #8ee5b2);
  color: var(--success-text);
}

.diff-view-split,
.diff-view-version {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 4px 8px;
  align-content: start;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 13px;
  line-height: 1.5;
}

.side-head {
  position: sticky;
  top: -14px;
  z-index: 1;
  margin: -14px 0 4px;
  background: var(--surface-soft);
  color: var(--muted);
  padding: 10px 0 6px;
  font-weight: 700;
}

.side-cell {
  min-height: 28px;
  border-radius: 6px;
  padding: 6px 8px;
  white-space: pre-wrap;
  word-break: break-word;
  cursor: pointer;
}

.side-del {
  background: var(--danger-bg);
  color: var(--danger-text);
}

.side-ins {
  background: var(--success-bg);
  color: var(--success-text);
}

.version-cell {
  min-height: 340px;
  border-radius: 8px;
  background: var(--surface);
  padding: 12px;
  white-space: pre-wrap;
  word-break: break-word;
}

.version-old {
  border: 1px solid #f1b6b6;
}

.version-new {
  border: 1px solid #a9e8bf;
}

.report-grid {
  display: grid;
  grid-template-columns: 0.85fr 1fr 1fr;
  gap: 16px;
  margin-top: 16px;
}

.report-panel {
  min-height: 170px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  padding: 14px;
  box-shadow: var(--shadow);
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.help-dialog {
  width: min(560px, calc(100vw - 32px));
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  padding: 0;
  box-shadow: var(--shadow);
}

.help-dialog::backdrop {
  background: rgba(7, 17, 33, 0.45);
  backdrop-filter: blur(3px);
}

.help-card {
  border-radius: 8px;
  background: var(--surface);
  padding: 18px;
}

.help-card ol {
  margin: 16px 0 0;
  padding-left: 22px;
  color: var(--muted);
  line-height: 1.6;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.metric {
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-soft);
  padding: 10px;
}

.metric strong {
  display: block;
  font-size: 19px;
  line-height: 1.15;
}

.metric span {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.issue-list {
  display: grid;
  gap: 8px;
  margin-top: 12px;
  max-height: 260px;
  overflow: auto;
}

.issue {
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  background: var(--surface-soft);
  padding: 10px;
}

.issue.manual {
  border-left-color: var(--manual);
}

.issue.warning {
  border-left-color: var(--warn);
}

.issue.clickable {
  cursor: pointer;
}

.issue.clickable:hover {
  background: var(--accent-soft);
}

.issue-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
}

.issue-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.issue-locate {
  min-height: 26px;
  border-color: var(--border);
  background: transparent;
  color: var(--accent-strong);
  padding: 0 8px;
  font-size: 12px;
}

.issue-locate:hover {
  background: var(--accent-soft);
}

.issue small {
  color: var(--muted);
  font-weight: 500;
  white-space: nowrap;
}

.issue p {
  margin-top: 6px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.empty {
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 980px) {
  .app-shell {
    width: min(100vw - 20px, 760px);
    padding: 16px 0;
  }

  .topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .primary-toolbar {
    grid-template-columns: 1fr;
  }

  .toolbar-controls,
  .toolbar-edge,
  .toolbar-edge-right,
  .header-actions {
    justify-content: stretch;
  }

  .toolbar-controls > *,
  .toolbar-edge button,
  .toolbar-edge label,
  .header-actions button {
    flex: 1;
  }

  .workspace-grid,
  .report-grid {
    grid-template-columns: 1fr;
  }

  .editor-pane,
  .compare-pane {
    min-height: 320px;
  }

  .metrics {
    grid-template-columns: 1fr;
  }
}