:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --panel: #ffffff;
  --panel-2: #eef3f7;
  --text: #1d2733;
  --muted: #667485;
  --line: #d8e0e7;
  --line-strong: #b9c6d1;
  --accent: #0877d1;
  --accent-strong: #075da2;
  --accent-soft: #e8f3ff;
  --success: #16845b;
  --danger: #c83d3d;
  --danger-soft: #fff0f0;
  --shadow: 0 18px 48px rgba(30, 41, 59, 0.15);
  --radius: 8px;
  --topbar-h: 72px;
  --quickbar-h: 58px;
  --status-h: 34px;
  --tool-w: 58px;
  --pages-w: 244px;
  --inspector-w: 340px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body[data-theme="dark"] {
  color-scheme: dark;
  --bg: #11161d;
  --panel: #171f28;
  --panel-2: #202a35;
  --text: #e9eef4;
  --muted: #9facba;
  --line: #2e3b48;
  --line-strong: #465766;
  --accent: #55a8ff;
  --accent-strong: #8bc2ff;
  --accent-soft: #132b43;
  --success: #48b884;
  --danger: #ff6c6c;
  --danger-soft: #3a1d22;
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.4);
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-height: 100%;
  margin: 0;
}

body {
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

svg {
  display: block;
}

.is-hidden {
  display: none !important;
}

.app-shell {
  display: grid;
  grid-template-rows: var(--topbar-h) var(--quickbar-h) minmax(0, 1fr) var(--status-h);
  height: 100vh;
  min-width: 320px;
}

.topbar,
.quickbar,
.statusbar {
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 0 18px;
}

.brand-block {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 8px;
  background: var(--accent);
  color: white;
  font-weight: 800;
  font-size: 0.86rem;
  letter-spacing: 0;
}

.brand-block h1,
.panel-head h2,
.panel-title h2,
.drop-hero h2,
.modal-head h2,
.gate-card h1 {
  margin: 0;
  letter-spacing: 0;
}

.brand-block h1 {
  font-size: 1.08rem;
  line-height: 1.25;
}

.brand-block p,
.panel-head p,
.drop-hero p,
.muted,
.empty-note {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.top-actions,
.quickbar,
.page-actions,
.drop-actions,
.modal-actions,
.signature-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
}

.top-actions {
  min-width: 0;
  justify-content: flex-end;
}

.button,
.icon-button,
.tool-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.15s ease;
}

.button:hover,
.icon-button:hover,
.tool-button:hover {
  border-color: var(--line-strong);
  background: var(--panel-2);
}

.button:active,
.icon-button:active,
.tool-button:active {
  transform: translateY(1px);
}

.button {
  gap: 8px;
  padding: 0 12px;
  font-weight: 650;
  font-size: 0.88rem;
  white-space: nowrap;
}

.button svg,
.icon-button svg,
.tool-button svg {
  width: 18px;
  height: 18px;
  stroke-width: 2.15;
}

.button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: white;
}

.button.primary:hover {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
}

.button.success {
  border-color: var(--success);
  background: var(--success);
  color: white;
}

.button.is-active,
.tool-button.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.icon-button {
  width: 36px;
  height: 36px;
  padding: 0;
}

.icon-button.danger,
.danger-tool.is-active,
.danger-tool:hover {
  border-color: color-mix(in srgb, var(--danger), var(--line) 35%);
  color: var(--danger);
}

.quickbar {
  padding: 8px 12px;
  overflow-x: auto;
  overflow-y: hidden;
}

.segmented {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  min-height: 36px;
  padding: 0 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-2);
}

.segmented .icon-button {
  width: 30px;
  height: 30px;
  border-color: transparent;
  background: transparent;
}

.segmented output,
.page-nav span {
  min-width: 54px;
  color: var(--muted);
  font-size: 0.83rem;
  text-align: center;
}

.page-nav span {
  min-width: 126px;
}

.quick-spacer {
  flex: 1 0 18px;
}

.editor-toolbar {
  gap: 8px;
  align-items: stretch;
}

.editor-toolbar > * {
  flex: 0 0 auto;
}

.toolbar-group {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 40px;
  padding: 3px 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-2);
}

.toolbar-group .button {
  min-height: 32px;
  padding: 0 9px;
  background: var(--panel);
  font-size: 0.82rem;
}

.toolbar-label {
  padding: 0 4px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
}

.workspace {
  display: grid;
  grid-template-columns: var(--tool-w) var(--pages-w) minmax(0, 1fr) var(--inspector-w);
  min-height: 0;
}

.tool-rail,
.pages-panel,
.inspector {
  border-right: 1px solid var(--line);
  background: var(--panel);
}

.tool-rail {
  display: flex;
  flex-direction: column;
  gap: 7px;
  align-items: center;
  padding: 10px 8px;
}

.tool-button {
  width: 40px;
  height: 40px;
  padding: 0;
}

.pages-panel {
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
  min-width: 0;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 14px 12px 10px;
}

.panel-head h2,
.panel-title h2 {
  font-size: 0.92rem;
}

.panel-head p {
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.page-actions {
  padding: 0 12px 10px;
}

.thumb-list {
  min-height: 0;
  overflow: auto;
  padding: 0 10px 12px;
}

.thumb-item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 28px;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

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

.thumb-item[draggable="true"] {
  cursor: grab;
}

.thumb-item.is-dragging {
  opacity: 0.5;
}

.thumb-canvas-wrap {
  display: grid;
  width: 42px;
  height: 56px;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: white;
}

.thumb-canvas-wrap canvas {
  max-width: 100%;
  max-height: 100%;
}

.thumb-meta {
  min-width: 0;
}

.thumb-meta strong {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.84rem;
}

.thumb-meta span {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.72rem;
}

.canvas-zone {
  position: relative;
  min-width: 0;
  min-height: 0;
  background:
    linear-gradient(45deg, color-mix(in srgb, var(--line), transparent 55%) 25%, transparent 25%),
    linear-gradient(-45deg, color-mix(in srgb, var(--line), transparent 55%) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, color-mix(in srgb, var(--line), transparent 55%) 75%),
    linear-gradient(-45deg, transparent 75%, color-mix(in srgb, var(--line), transparent 55%) 75%);
  background-color: var(--bg);
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
  background-size: 20px 20px;
}

.drop-zone {
  position: absolute;
  inset: 0;
  z-index: 4;
  display: grid;
  place-items: center;
  padding: 20px;
  background: color-mix(in srgb, var(--bg), transparent 4%);
}

.drop-zone.is-dragover {
  outline: 3px solid var(--accent);
  outline-offset: -8px;
}

.drop-hero {
  width: min(620px, 100%);
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
  text-align: center;
}

.drop-icon,
.gate-icon {
  display: grid;
  width: 54px;
  height: 54px;
  margin: 0 auto 14px;
  place-items: center;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.drop-icon svg,
.gate-icon svg {
  width: 28px;
  height: 28px;
}

.drop-hero h2 {
  font-size: clamp(1.45rem, 3vw, 2rem);
}

.drop-actions {
  justify-content: center;
  margin-top: 18px;
  flex-wrap: wrap;
}

.viewer-scroll {
  position: absolute;
  inset: 0;
  overflow: auto;
  padding: 34px;
}

.page-stage {
  position: relative;
  width: 0;
  height: 0;
  min-width: 0;
  min-height: 0;
  margin: 0 auto 34px;
  box-shadow: 0 16px 36px rgba(15, 23, 42, 0.22);
  background: white;
  transform-origin: top center;
}

#pdfCanvas,
#annotationLayer {
  position: absolute;
  inset: 0;
}

#annotationLayer {
  z-index: 2;
  touch-action: none;
  overflow: visible;
}

.annotation-selected {
  outline: none;
}

.inspector {
  min-width: 0;
  overflow: auto;
  padding: 10px;
  border-right: 0;
  border-left: 1px solid var(--line);
}

.panel-card {
  margin-bottom: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.panel-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.panel-badge {
  max-width: 136px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding: 3px 7px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-2);
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
}

.context-hint {
  margin: -2px 0 10px;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.35;
}

.property-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.property-grid label,
.panel-card label {
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
}

.property-grid .wide {
  grid-column: 1 / -1;
}

input,
textarea {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  padding: 8px 9px;
}

textarea {
  resize: vertical;
}

input[type="color"] {
  height: 38px;
  padding: 3px;
}

input[type="range"] {
  padding: 0;
}

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

.tool-grid .button {
  justify-content: flex-start;
  min-width: 0;
  padding: 0 10px;
}

.tool-grid .button span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.toggle-row {
  display: flex !important;
  grid-template-columns: none !important;
  align-items: center;
  gap: 8px !important;
  margin-top: 10px;
}

.toggle-row input {
  width: auto;
}

.layer-tree {
  display: grid;
  gap: 6px;
}

.layer-empty {
  padding: 10px;
  border: 1px dashed var(--line);
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.82rem;
}

.layer-root,
.layer-row {
  display: grid;
  align-items: center;
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.layer-root {
  grid-template-columns: 22px minmax(0, 1fr);
  padding: 0 8px;
  font-size: 0.82rem;
  font-weight: 800;
}

.layer-row {
  grid-template-columns: 24px minmax(0, 1fr) auto;
  gap: 6px;
  margin-left: 14px;
  padding: 4px 5px 4px 8px;
}

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

.layer-row.is-hidden-layer .layer-name {
  color: var(--muted);
  text-decoration: line-through;
}

.layer-name {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  border: 0;
  background: transparent;
  color: var(--text);
  text-align: left;
  font-weight: 700;
}

.layer-icon {
  color: var(--muted);
}

.layer-actions {
  display: inline-flex;
  gap: 2px;
}

.layer-action {
  display: grid;
  width: 26px;
  height: 26px;
  place-items: center;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
}

.layer-action:hover,
.layer-name:hover {
  background: var(--panel-2);
  color: var(--text);
}

.layer-action svg,
.layer-icon svg {
  width: 15px;
  height: 15px;
}

.statusbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 0 12px;
  color: var(--muted);
  font-size: 0.78rem;
}

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

.toast-wrap {
  position: fixed;
  right: 18px;
  bottom: 48px;
  z-index: 40;
  display: grid;
  gap: 8px;
  width: min(360px, calc(100vw - 36px));
}

.toast {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
  color: var(--text);
  font-size: 0.86rem;
}

.toast.danger {
  border-left-color: var(--danger);
}

.toast.success {
  border-left-color: var(--success);
}

.modal,
.capability-gate {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(9, 14, 20, 0.58);
}

.modal-card,
.gate-card {
  width: min(720px, 100%);
  max-height: min(84vh, 760px);
  overflow: auto;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.modal-actions {
  justify-content: flex-end;
  margin-top: 14px;
  flex-wrap: wrap;
}

.signature-card {
  width: min(820px, 100%);
}

.signature-tabs {
  margin-bottom: 10px;
}

#signatureCanvas {
  display: block;
  width: 100%;
  height: 220px;
  border: 1px dashed var(--line-strong);
  border-radius: 8px;
  background: white;
  touch-action: none;
}

#typedSignature {
  height: 72px;
  font-family: "Segoe Script", "Brush Script MT", cursive;
  font-size: 2rem;
}

.report-card {
  width: min(860px, 100%);
}

#reportBody {
  max-height: 58vh;
  overflow: auto;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-2);
  color: var(--text);
  white-space: pre-wrap;
}

.gate-card {
  text-align: center;
}

.gate-card ul {
  display: inline-block;
  margin: 14px auto;
  padding-left: 22px;
  text-align: left;
}

.resize-handle {
  cursor: nwse-resize;
}

.move-cursor {
  cursor: move;
}

@media (max-width: 1180px) {
  :root {
    --pages-w: 210px;
    --inspector-w: 300px;
  }

  .top-actions > .button span {
    display: none;
  }
}

@media (max-width: 900px) {
  body {
    overflow: auto;
  }

  .app-shell {
    min-height: 100vh;
    height: auto;
    grid-template-rows: auto auto minmax(680px, 1fr) auto;
  }

  .topbar {
    min-height: var(--topbar-h);
    flex-wrap: wrap;
    padding: 10px 12px;
  }

  .top-actions {
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .workspace {
    grid-template-columns: var(--tool-w) minmax(0, 1fr);
    grid-template-rows: minmax(520px, 62vh) auto auto;
  }

  .tool-rail {
    grid-row: 1 / 2;
  }

  .canvas-zone {
    grid-column: 2 / 3;
    grid-row: 1 / 2;
    min-height: 520px;
  }

  .pages-panel {
    grid-column: 1 / -1;
    grid-row: 2 / 3;
    border-top: 1px solid var(--line);
  }

  .inspector {
    grid-column: 1 / -1;
    grid-row: 3 / 4;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .thumb-list {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: 188px;
    overflow-x: auto;
    overflow-y: hidden;
  }

  .thumb-item {
    margin-right: 8px;
  }
}

@media (max-width: 560px) {
  :root {
    --tool-w: 48px;
  }

  .brand-block p {
    display: none;
  }

  .quickbar {
    align-items: flex-start;
  }

  .toolbar-label {
    display: none;
  }

  .editor-toolbar .button span {
    display: none;
  }

  .viewer-scroll {
    padding: 18px;
  }

  .drop-hero {
    padding: 18px;
  }

  .property-grid,
  .tool-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .workspace {
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(500px, 62vh) auto auto;
  }

  .tool-rail {
    grid-column: 1 / -1;
    grid-row: 1 / 2;
    flex-direction: row;
    justify-content: flex-start;
    overflow-x: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .canvas-zone {
    grid-column: 1 / -1;
    grid-row: 2 / 3;
    min-height: 500px;
  }

  .pages-panel {
    grid-column: 1 / -1;
    grid-row: 3 / 4;
  }

  .inspector {
    grid-column: 1 / -1;
    grid-row: 4 / 5;
  }

  .tool-button {
    flex: 0 0 40px;
  }
}