:root {
  color-scheme: light;
  --bg: #eef2f7;
  --panel: #ffffff;
  --panel-soft: #f8fafc;
  --ink: #111827;
  --muted: #64748b;
  --line: #d7dee8;
  --line-strong: #b9c4d2;
  --accent: #0066cc;
  --accent-soft: #e7f0ff;
  --old: #0066ff;
  --new: #d71920;
  --yellow: #ffe900;
  --shadow: 0 12px 34px rgba(15, 23, 42, 0.12);
  --page-scale: 1;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 1080px;
  background: var(--bg);
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Microsoft YaHei", sans-serif;
}

button,
input {
  font: inherit;
}

.app-shell {
  display: grid;
  grid-template-columns: 184px minmax(760px, 1fr);
  height: 100vh;
  overflow: hidden;
}

.sidebar {
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr) auto;
  height: 100vh;
  min-width: 0;
  border-right: 1px solid var(--line);
  background: var(--panel);
}

.sidebar-header,
.topbar,
.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.sidebar-header {
  padding: 16px 12px 14px;
  border-bottom: 1px solid var(--line);
}

.kicker {
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  overflow: hidden;
  max-width: 122px;
  font-size: 16px;
  line-height: 1.2;
  letter-spacing: 0;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.toolbar {
  display: flex;
  align-items: center;
}

.sidebar-meta {
  display: flex;
  flex-direction: column;
  gap: 1px;
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.25;
}

.sidebar-meta strong {
  color: var(--ink);
}

.icon-button {
  display: inline-grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
  transition: border-color 160ms ease, color 160ms ease, background 160ms ease;
}

.icon-button:hover,
.icon-button:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  outline: none;
}

.icon-button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.search-box svg {
  flex: 0 0 auto;
  width: 15px;
  height: 15px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 8px 6px 10px;
  padding: 0 6px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--muted);
}

.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.12);
}

.search-box input {
  min-width: 0;
  width: 100%;
  border: 0;
  outline: 0;
  color: var(--ink);
  font-size: 11px;
}

.search-box input::placeholder {
  color: #64748b;
  font-size: 11px;
}

.diff-list-wrap {
  position: relative;
  min-height: 0;
  overflow: hidden;
}

.diff-list {
  height: 100%;
  overflow: auto;
  min-height: 0;
  padding: 0 14px 12px 8px;
  scrollbar-width: thin;
  scrollbar-color: #c5cfdc transparent;
}

.diff-scrollbar {
  position: absolute;
  top: 8px;
  right: 3px;
  bottom: 12px;
  width: 7px;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: rgba(226, 232, 240, 0.85);
  cursor: pointer;
}

.diff-scrollbar span {
  position: absolute;
  top: 0;
  left: 1px;
  width: 5px;
  min-height: 28px;
  border-radius: 999px;
  background: #94a3b8;
}

.diff-list::-webkit-scrollbar,
.document-scroll::-webkit-scrollbar {
  width: 8px;
  height: 7px;
}

.diff-list::-webkit-scrollbar-track,
.document-scroll::-webkit-scrollbar-track {
  background: rgba(226, 232, 240, 0.65);
}

.diff-list::-webkit-scrollbar-thumb,
.document-scroll::-webkit-scrollbar-thumb {
  border: 2px solid rgba(226, 232, 240, 0.65);
  border-radius: 999px;
  background: #c5cfdc;
}

.diff-list::-webkit-scrollbar-thumb:hover,
.document-scroll::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

.diff-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px;
  width: 100%;
  margin: 4px 0;
  padding: 8px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  transition: background 160ms ease, border-color 160ms ease;
}

.compact-item {
  display: none;
}

.diff-group {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 6px;
  margin: 10px 0 4px;
  padding: 6px 8px 4px;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.diff-group:first-child {
  margin-top: 0;
  border-top: 0;
}

.diff-group-title {
  overflow: hidden;
  font-size: 12px;
  font-weight: 900;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.diff-item.is-child {
  position: relative;
  margin-left: 12px;
  width: calc(100% - 12px);
}

.diff-item.is-child::before {
  position: absolute;
  top: -6px;
  bottom: 50%;
  left: -8px;
  width: 7px;
  border-bottom: 1px solid var(--line-strong);
  border-left: 1px solid var(--line-strong);
  border-bottom-left-radius: 5px;
  content: "";
}

.diff-item:hover,
.diff-item:focus-visible {
  border-color: var(--line-strong);
  background: var(--panel-soft);
  outline: none;
}

.diff-item.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.diff-title {
  min-width: 0;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.35;
}

.diff-meta {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 12px;
}

.badge {
  align-self: start;
  min-width: 30px;
  padding: 2px 7px;
  border-radius: 999px;
  background: #e2e8f0;
  color: #334155;
  font-size: 12px;
  font-weight: 800;
  text-align: center;
}

.sidebar-footer {
  display: flex;
  gap: 8px;
  padding: 10px;
  border-top: 1px solid var(--line);
  background: var(--panel-soft);
}

.sidebar-footer a {
  flex: 1;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
}

.workspace {
  display: grid;
  grid-template-rows: auto 1fr;
  min-width: 0;
  overflow: hidden;
}

.topbar {
  min-width: 0;
  height: 56px;
  padding: 0 12px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
}

.menu-button {
  display: none;
}

.active-title {
  display: flex;
  min-width: 0;
  flex: 1;
  flex-direction: column;
  gap: 2px;
}

#activeLabel {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 800;
}

#activeMeta {
  color: var(--muted);
  font-size: 12px;
}

.text-button {
  height: 34px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
}

.view-tools {
  display: flex;
  align-items: center;
  gap: 8px;
}

.zoom-readout {
  min-width: 48px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
  text-align: center;
}

.icon-button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.text-button.is-on {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.pdf-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 10px;
  min-height: 0;
  padding: 10px;
}

.pdf-pane {
  display: grid;
  grid-template-rows: auto 1fr;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.pane-header {
  min-height: 46px;
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  background: var(--panel-soft);
}

.pane-header p {
  margin: 0 0 2px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.pane-header strong {
  display: block;
  font-size: 13px;
  line-height: 1.25;
}

.legend {
  flex: 0 0 auto;
  padding: 4px 8px;
  border-radius: 999px;
  background: var(--yellow);
  font-size: 12px;
  font-weight: 800;
}

.legend.old {
  color: var(--old);
}

.legend.new {
  color: var(--new);
}

.document-scroll {
  min-height: 0;
  overflow: auto;
  scroll-behavior: auto;
  background: #dbe3ed;
  padding: 14px;
  scrollbar-width: thin;
  scrollbar-color: #c5cfdc transparent;
}

.page {
  position: relative;
  width: min(calc(100% * var(--page-scale)), 1180px);
  min-width: min(100%, calc(595px * var(--page-scale)));
  margin: 0 auto 18px;
  background: #fff;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.18);
}

.page img {
  display: block;
  width: 100%;
  height: auto;
}

.page-number {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 3px 7px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.72);
  color: #fff;
  font-size: 11px;
  font-weight: 800;
  pointer-events: none;
}

.hotspot {
  position: absolute;
  border: 1px solid transparent;
  border-radius: 3px;
  background: transparent;
  cursor: pointer;
  transition: border-color 120ms ease, box-shadow 120ms ease, background 120ms ease;
}

.hotspot:hover,
.hotspot:focus-visible,
.hotspot.is-active {
  border-color: #111827;
  background: rgba(255, 255, 255, 0.12);
  box-shadow: 0 0 0 2px rgba(17, 24, 39, 0.18);
  outline: none;
}

.app-shell.is-sidebar-compact {
  grid-template-columns: 58px minmax(760px, 1fr);
}

.app-shell.is-sidebar-compact .sidebar {
  grid-template-rows: auto 1fr;
}

.app-shell.is-sidebar-compact .sidebar-header {
  justify-content: center;
  padding: 10px 6px;
}

.app-shell.is-sidebar-compact #compactSidebar svg {
  transform: rotate(180deg);
}

.app-shell.is-sidebar-compact .sidebar-header > div:first-child,
.app-shell.is-sidebar-compact .search-box,
.app-shell.is-sidebar-compact .sidebar-footer,
.app-shell.is-sidebar-compact .badge,
.app-shell.is-sidebar-compact .diff-group-title,
.app-shell.is-sidebar-compact .diff-title,
.app-shell.is-sidebar-compact .diff-meta {
  display: none;
}

.app-shell.is-sidebar-compact .diff-list {
  min-height: 0;
  padding: 8px 8px 8px 4px;
}

.app-shell.is-sidebar-compact .diff-scrollbar {
  right: 1px;
  width: 5px;
}

.app-shell.is-sidebar-compact .diff-scrollbar span {
  left: 0;
  width: 5px;
}

.app-shell.is-sidebar-compact .diff-group,
.app-shell.is-sidebar-compact .diff-item {
  display: none;
}

.app-shell.is-sidebar-compact .compact-item {
  position: relative;
  display: grid;
  width: 46px;
  min-height: 50px;
  margin: 5px 0;
  padding: 0;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 900;
  border-color: var(--line);
  background: var(--panel-soft);
  overflow: hidden;
  line-height: 1.1;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.app-shell.is-sidebar-compact .compact-parent {
  min-height: 42px;
  margin-top: 10px;
  border-color: var(--line);
  background: var(--panel-soft);
  color: var(--ink);
}

.app-shell.is-sidebar-compact .compact-child {
  width: 34px;
  min-height: 32px;
  margin: 3px 0 3px 12px;
  border-color: #dbe4f0;
  border-radius: 7px;
  font-size: 12px;
  background: #fff;
}

.app-shell.is-sidebar-compact .compact-child::before {
  position: absolute;
  top: -7px;
  bottom: 50%;
  left: -7px;
  width: 7px;
  border-bottom: 1px solid #aebccc;
  border-left: 1px solid #aebccc;
  border-bottom-left-radius: 5px;
  content: "";
}

.app-shell.is-sidebar-compact .compact-child + .compact-child::after {
  position: absolute;
  top: -12px;
  left: -7px;
  height: 12px;
  border-left: 1px solid #aebccc;
  content: "";
}

.app-shell.is-sidebar-compact .compact-item:hover,
.app-shell.is-sidebar-compact .compact-item:focus-visible {
  border-color: var(--accent);
  outline: none;
}

.app-shell.is-sidebar-compact .compact-item.is-active {
  border-color: var(--accent);
  background: #f0f6ff;
  color: var(--accent);
}

.app-shell.is-sidebar-compact .compact-child.is-active {
  border-color: var(--accent);
  background: #f0f6ff;
}

@media (max-width: 900px) {
  body {
    min-width: 0;
  }

  .app-shell {
    grid-template-columns: minmax(0, 1fr);
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 20;
    width: min(320px, 88vw);
    transform: translateX(-100%);
    box-shadow: var(--shadow);
    transition: transform 180ms ease;
  }

  .app-shell:not(.is-sidebar-collapsed) .sidebar {
    transform: translateX(0);
  }

  .menu-button {
    display: inline-grid;
  }

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