:root {
  --bg: #2b2b2b;
  --bg2: #333;
  --bg3: #3d3d3d;
  --panel: #262626;
  --border: #1a1a1a;
  --text: #e6e6e6;
  --muted: #9a9a9a;
  --accent: #4c8dff;
  --accent2: #6aa2ff;
  --danger: #e53935;
  --viewer: #505050;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--text); font-family: var(--font); font-size: 13px; overflow: hidden; user-select: none; }
button { font-family: inherit; font-size: inherit; color: inherit; background: var(--bg3); border: 1px solid var(--border); border-radius: 4px; padding: 4px 8px; cursor: pointer; }
button:hover { background: #4a4a4a; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover { background: var(--accent2); }
button.link { background: none; border: none; color: var(--accent2); padding: 2px 0; }
button.link:hover { text-decoration: underline; background: none; }
button.wide { width: 100%; }
input, select, textarea, [contenteditable] { user-select: text; -webkit-user-select: text; }
input, select, textarea { font-family: inherit; font-size: inherit; color: var(--text); background: #1e1e1e; border: 1px solid #111; border-radius: 3px; padding: 3px 6px; }
input[type=number].num { width: 54px; }
input[type=color] { width: 22px; height: 22px; padding: 0; border: none; background: none; cursor: pointer; }
input[type=range] { width: 70px; }
.muted { color: var(--muted); }
.hidden { display: none !important; }

#app { display: flex; flex-direction: column; height: 100%; }

/* Toolbar */
#toolbar { display: flex; align-items: center; gap: 4px; padding: 4px 8px; background: var(--bg2); border-bottom: 1px solid var(--border); flex-shrink: 0; }
.tb-group { display: flex; align-items: center; gap: 2px; }
.tb-sep { width: 1px; height: 24px; background: #555; margin: 0 6px; }
.tb-spacer { flex: 1; }
.tb-btn { width: 32px; height: 32px; padding: 0; display: inline-flex; align-items: center; justify-content: center; background: transparent; border: 1px solid transparent; border-radius: 4px; }
.tb-btn svg { width: 20px; height: 20px; stroke: var(--text); stroke-width: 1.8; fill: var(--text); stroke-linecap: round; stroke-linejoin: round; }
.tb-btn svg [fill="none"] { fill: none; }
.tb-btn:hover { background: #454545; }
.tb-btn.active { background: var(--accent); border-color: var(--accent); }
.tb-btn.active svg { stroke: #fff; fill: #fff; }
.tb-btn.active svg [fill="none"] { fill: none; }
.tb-btn.sign-btn { width: auto; padding: 0 10px; gap: 6px; font-weight: 600; }
.tb-btn.sign-btn svg { stroke: #7ed0ff; fill: none; }
.tb-btn.sign-btn.active svg { stroke: #fff; }
#props-inline label { display: inline-flex; align-items: center; gap: 4px; margin-left: 6px; }
.swatch-wrap { position: relative; display: inline-flex; align-items: center; gap: 2px; padding: 2px; border: 1px solid #555; border-radius: 3px; }

/* Body */
#body { display: flex; flex: 1; min-height: 0; }
#sidebar { width: 280px; background: var(--panel); border-right: 1px solid var(--border); display: flex; flex-direction: column; flex-shrink: 0; }
#sidebar.collapsed { display: none; }
.side-tabs { display: flex; flex-wrap: wrap; border-bottom: 1px solid var(--border); }
.side-tab { flex: 1; background: none; border: none; border-radius: 0; padding: 6px 1px; font-size: 10.5px; white-space: nowrap; color: var(--muted); border-bottom: 2px solid transparent; }
.side-tab.active { color: var(--text); border-bottom-color: var(--accent); }
.side-panel { display: none; flex: 1; min-height: 0; overflow: auto; flex-direction: column; }
.side-panel.active { display: flex; }
.panel-toolbar { display: flex; gap: 4px; padding: 6px; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.panel-toolbar button { padding: 3px 7px; font-size: 12px; }
.panel-list { padding: 6px; overflow: auto; flex: 1; }
.list-item { padding: 6px 8px; border-radius: 4px; cursor: pointer; border-bottom: 1px solid #2e2e2e; }
.list-item:hover { background: #333; }
.list-item .sub { color: var(--muted); font-size: 11px; }
.list-item mark { background: #ffe066; color: #000; }
.outline-item { padding: 3px 4px; cursor: pointer; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.outline-item:hover { background: #333; }

#thumbs { padding: 8px; overflow: auto; flex: 1; display: flex; flex-direction: column; gap: 10px; align-items: center; }
.thumb { position: relative; padding: 6px; border-radius: 4px; border: 2px solid transparent; cursor: pointer; background: #2e2e2e; text-align: center; }
.thumb.current { border-color: var(--accent); }
.thumb.selected { background: #3a4a6a; }
.thumb canvas { background: #fff; box-shadow: 0 1px 4px rgba(0,0,0,.6); display: block; margin: 0 auto; }
.thumb .thumb-num { font-size: 11px; color: var(--muted); margin-top: 4px; }
.thumb.drag-over-before { box-shadow: 0 -3px 0 var(--accent); }
.thumb.drag-over-after { box-shadow: 0 3px 0 var(--accent); }

.search-box { padding: 8px; border-bottom: 1px solid var(--border); display: flex; flex-direction: column; gap: 6px; }
.search-box input[type=text] { width: 100%; }

/* Viewer */
#viewer-wrap { flex: 1; position: relative; min-width: 0; background: var(--viewer); }
#viewer { position: absolute; inset: 0; overflow: auto; padding: 20px; outline: none; }
#viewer.hidden { display: none; }
#welcome { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; }
.welcome-card { background: var(--bg2); padding: 40px 50px; border-radius: 10px; text-align: center; box-shadow: 0 6px 30px rgba(0,0,0,.4); min-width: 420px; }
.welcome-card h1 { margin: 0 0 8px; font-weight: 600; }
.welcome-actions { display: flex; gap: 10px; justify-content: center; margin: 18px 0 8px; }
.welcome-actions button { padding: 8px 18px; font-size: 14px; }
.hint { color: var(--muted); }
#recent-list { text-align: left; margin-top: 10px; }
#recent-list .list-item { font-size: 12px; }
#drop-hint { position: absolute; inset: 10px; border: 3px dashed var(--accent); border-radius: 12px; display: none; align-items: center; justify-content: center; font-size: 24px; background: rgba(76,141,255,.15); pointer-events: none; }
#viewer-wrap.dragging #drop-hint { display: flex; }

.page { position: relative; margin: 0 auto 20px; background: #fff; box-shadow: 0 2px 10px rgba(0,0,0,.5); }
.page canvas.pg { position: absolute; left: 0; top: 0; display: block; }
.page .scaled { position: absolute; left: 0; top: 0; transform-origin: 0 0; }
.page .textLayer { position: absolute; left: 0; top: 0; overflow: hidden; opacity: 1; line-height: 1; pointer-events: none; }
.page .textLayer span { position: absolute; color: transparent; white-space: pre; transform-origin: 0 0; cursor: text; }
.page .textLayer span::selection { background: rgba(76,141,255,.45); }
.page .textLayer.selectable { pointer-events: auto; user-select: text; }
.page .textLayer span.hit { background: rgba(255, 224, 102, .6); }
.page .textLayer span.hit.cur { background: rgba(255, 140, 0, .8); }
.page .formLayer { position: absolute; left: 0; top: 0; }
.page .formLayer .ff { position: absolute; background: rgba(204, 228, 255, .85); border: 1px solid rgba(76,141,255,.6); font-size: 10px; padding: 0 2px; color: #000; font-family: Helvetica, Arial, sans-serif; }
.page .formLayer .ff:focus { outline: 2px solid var(--accent); background: #fff; }
.page .formLayer select.ff { padding: 0; }
.page .formLayer input[type=checkbox].ff, .page .formLayer input[type=radio].ff { padding: 0; margin: 0; }
.page svg.annots { position: absolute; left: 0; top: 0; overflow: visible; pointer-events: none; }
.page svg.annots .ann, .page svg.annots .handle { pointer-events: auto; }
.page svg.annots .ann { cursor: move; }
.page svg.annots .ann.locked { cursor: default; }
.page svg.annots .sel-box { fill: none; stroke: var(--accent); stroke-width: 1; vector-effect: non-scaling-stroke; stroke-dasharray: 4 3; pointer-events: none; }
.page svg.annots .handle { fill: #fff; stroke: var(--accent); stroke-width: 1; vector-effect: non-scaling-stroke; cursor: nwse-resize; }
.page svg.annots .handle.h-n, .page svg.annots .handle.h-s { cursor: ns-resize; }
.page svg.annots .handle.h-e, .page svg.annots .handle.h-w { cursor: ew-resize; }
.page svg.annots .handle.h-ne, .page svg.annots .handle.h-sw { cursor: nesw-resize; }
.page svg.annots .note-icon { cursor: pointer; }
.page textarea.text-editor { position: absolute; background: rgba(255,255,255,.9); color: #000; border: none; outline: 1px dashed var(--accent); padding: 0; margin: 0; resize: none; overflow: hidden; line-height: 1.2; white-space: pre; font-family: Helvetica, Arial, sans-serif; outline: none; }
.page .note-popup { position: absolute; width: 220px; background: #fff8c4; color: #222; border: 1px solid #c9b862; border-radius: 4px; padding: 6px; font-size: 12px; z-index: 5; box-shadow: 0 2px 8px rgba(0,0,0,.4); }
.page .note-popup textarea { width: 100%; height: 80px; background: #fffdf0; color: #222; border: 1px solid #ddd; resize: vertical; }
.page .note-popup .np-head { display: flex; justify-content: space-between; margin-bottom: 4px; font-weight: 600; }
.page .note-popup .np-head button { padding: 0 5px; font-size: 11px; }

#viewer[data-tool=hand] { cursor: grab; }
#viewer[data-tool=hand].panning { cursor: grabbing; }
#viewer[data-tool=text] .page, #viewer[data-tool=note] .page, #viewer[data-tool=image] .page, #viewer[data-tool=sign] .page { cursor: crosshair; }
#viewer[data-tool=ink] .page, #viewer[data-tool=rect] .page, #viewer[data-tool=ellipse] .page, #viewer[data-tool=line] .page, #viewer[data-tool=arrow] .page, #viewer[data-tool=highlight] .page, #viewer[data-tool=whiteout] .page, #viewer[data-tool=redact] .page, #viewer[data-tool=crop] .page, #viewer[data-tool=sigrect] .page { cursor: crosshair; }
#viewer[data-tool=textselect] .page, #viewer[data-tool=text] .page, #viewer[data-tool=edittext] .page { cursor: text; }
#viewer[data-tool=editimage] .page, #viewer[data-tool=measure] .page, #viewer[data-tool=area] .page, #viewer[data-tool^=ff-] .page, #viewer[data-tool=stamp] .page { cursor: crosshair; }
.page svg.hints { position: absolute; left: 0; top: 0; pointer-events: none; }
.page svg.hints rect { fill: rgba(76,141,255,.06); stroke: #4c8dff; stroke-width: 1; vector-effect: non-scaling-stroke; stroke-dasharray: 3 2; }
.page svg.hints rect.img { stroke: #ff9800; fill: rgba(255,152,0,.08); }

/* Props panel */
#propspanel { width: 230px; background: var(--panel); border-left: 1px solid var(--border); padding: 10px; overflow: auto; flex-shrink: 0; }
#propspanel.collapsed { display: none; }
.props-title { font-weight: 600; margin-bottom: 8px; }
.prop-row { display: flex; align-items: center; justify-content: space-between; margin: 6px 0; gap: 6px; }
.prop-row label { color: var(--muted); font-size: 12px; }
.prop-row input[type=text], .prop-row select, .prop-row textarea { width: 130px; }
.prop-row textarea { height: 70px; resize: vertical; }
.prop-row input[type=number] { width: 64px; }
.prop-actions { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 10px; }

/* Status bar */
#statusbar { display: flex; align-items: center; gap: 12px; padding: 3px 10px; background: var(--bg2); border-top: 1px solid var(--border); flex-shrink: 0; font-size: 12px; }
.sb-group { display: flex; align-items: center; gap: 4px; }
.sb-spacer { flex: 1; }
#statusbar button { padding: 1px 7px; }
#status-msg { color: var(--muted); }
#status-file { color: var(--muted); max-width: 400px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Popover */
.popover { position: fixed; z-index: 50; background: var(--bg2); border: 1px solid #555; border-radius: 8px; box-shadow: 0 8px 30px rgba(0,0,0,.5); width: 300px; padding: 10px; }
.pop-title { font-weight: 600; margin-bottom: 6px; }
.pop-section { border-top: 1px solid #444; padding: 8px 0; }
.pop-label { color: var(--muted); font-size: 11px; text-transform: uppercase; margin-bottom: 6px; }
.pop-row { display: flex; gap: 4px; flex-wrap: wrap; }
.sig-list { display: flex; flex-direction: column; gap: 4px; margin-bottom: 4px; }
.sig-item { display: flex; align-items: center; gap: 6px; background: #fff; border-radius: 4px; padding: 4px; cursor: pointer; border: 2px solid transparent; }
.sig-item.active { border-color: var(--accent); }
.sig-item img { height: 36px; max-width: 200px; object-fit: contain; flex: 1; }
.sig-item .del { background: #f3f3f3; border: 1px solid #ccc; border-radius: 4px; color: #b00020; min-width: 30px; min-height: 30px; padding: 0 6px; font-size: 15px; line-height: 1; flex-shrink: 0; }
.sig-item .del:hover { background: #ffe5e8; border-color: var(--danger); }

/* Modal */
.modal { position: fixed; inset: 0; background: rgba(0,0,0,.55); z-index: 100; display: flex; align-items: center; justify-content: center; }
.modal-box { background: var(--bg2); border: 1px solid #555; border-radius: 8px; min-width: 460px; max-width: 90vw; max-height: 90vh; display: flex; flex-direction: column; box-shadow: 0 10px 40px rgba(0,0,0,.6); }
.modal-head { display: flex; justify-content: space-between; align-items: center; padding: 10px 14px; border-bottom: 1px solid #444; font-weight: 600; font-size: 14px; }
.modal-head button { background: none; border: none; font-size: 14px; }
.modal-body { padding: 14px; overflow: auto; }
.modal-foot { padding: 10px 14px; border-top: 1px solid #444; display: flex; justify-content: flex-end; gap: 8px; }
.form-row { display: flex; align-items: center; gap: 10px; margin: 8px 0; }
.form-row label { width: 130px; color: var(--muted); }
.form-row input[type=text], .form-row input[type=password], .form-row input[type=number], .form-row select, .form-row textarea { flex: 1; }
.form-row textarea { height: 60px; }
.form-help { color: var(--muted); font-size: 12px; margin: 4px 0 8px; }
.tabs { display: flex; gap: 2px; border-bottom: 1px solid #444; margin-bottom: 10px; }
.tabs button { background: none; border: none; border-bottom: 2px solid transparent; border-radius: 0; padding: 6px 12px; }
.tabs button.active { border-bottom-color: var(--accent); }
.sigpad { background: #fff; border-radius: 4px; display: block; cursor: crosshair; touch-action: none; }
.sig-type-preview { background: #fff; color: #111; height: 90px; display: flex; align-items: center; justify-content: center; font-size: 42px; border-radius: 4px; overflow: hidden; }
.color-row { display: flex; gap: 6px; align-items: center; }
.color-dot { width: 22px; height: 22px; border-radius: 50%; border: 2px solid transparent; cursor: pointer; }
.color-dot.active { border-color: #fff; }
.kbd-table { border-collapse: collapse; width: 100%; }
.kbd-table td { padding: 3px 8px; border-bottom: 1px solid #3a3a3a; }
.kbd-table td:first-child { color: var(--muted); width: 140px; }
kbd { background: #1e1e1e; border: 1px solid #555; border-radius: 3px; padding: 1px 5px; font-family: inherit; }
.sig-status-ok { color: #6fdc8c; }
.sig-status-warn { color: #ffcc66; }
.sig-preview-box { background: #fff; color: #000; padding: 10px; border-radius: 4px; font-family: Helvetica, Arial, sans-serif; margin-top: 8px; display: flex; gap: 10px; align-items: center; }
.sig-preview-box img { height: 50px; }
.sig-preview-box .txt { font-size: 11px; line-height: 1.35; }

#toast { position: fixed; bottom: 40px; left: 50%; transform: translateX(-50%); background: #111; color: #fff; padding: 8px 16px; border-radius: 6px; z-index: 200; box-shadow: 0 4px 16px rgba(0,0,0,.5); }

/* ---- pro toolbar row ---- */
#toolbar2 { display: flex; align-items: center; gap: 3px; padding: 3px 8px; background: #2f2f2f; border-bottom: 1px solid var(--border); flex-shrink: 0; flex-wrap: wrap; }
.tb2-label { color: var(--muted); font-size: 11px; text-transform: uppercase; margin: 0 4px 0 2px; }
button.tb2 { background: transparent; border: 1px solid transparent; padding: 3px 9px; font-size: 12px; }
button.tb2:hover { background: #454545; }
button.tb2.active { background: var(--accent); border-color: var(--accent); color: #fff; }
/* ---- tabs ---- */
#tabbar { position: absolute; left: 0; right: 0; top: 0; height: 30px; background: #232323; border-bottom: 1px solid var(--border); display: flex; align-items: stretch; overflow-x: auto; z-index: 3; }
#viewer-wrap.tabs #viewer, #viewer-wrap.tabs #welcome { top: 30px; }
.tab { display: flex; align-items: center; gap: 6px; padding: 0 10px; border-right: 1px solid var(--border); color: var(--muted); cursor: pointer; max-width: 220px; font-size: 12px; white-space: nowrap; }
.tab.active { background: var(--viewer); color: var(--text); }
.tab:hover { background: #3a3a3a; }
.tab-name { overflow: hidden; text-overflow: ellipsis; }
.tab-close { background: none; border: none; color: var(--muted); padding: 0 3px; font-size: 11px; }
.tab-close:hover { color: #fff; background: none; }
.tab-plus { background: none; border: none; color: var(--muted); padding: 0 10px; font-size: 16px; }
/* ---- stamps / compare ---- */
.stamp-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin-bottom: 10px; }
.stamp-btn { background: #fff; border: 2px solid; border-radius: 4px; font-weight: 700; padding: 8px 4px; font-size: 12px; letter-spacing: 1px; }
.cmp-nav { display: flex; align-items: center; gap: 6px; margin: 6px 0; }
.cmp-row { display: flex; gap: 8px; }
.cmp-col { flex: 1; min-width: 0; }
.cmp-col canvas { width: 100%; height: auto; background: #fff; border: 1px solid #555; }
.cmp-text { margin-top: 8px; max-height: 120px; overflow: auto; font-size: 12px; line-height: 1.6; background: #1e1e1e; padding: 6px; border-radius: 4px; }
.cmp-text .del { background: #5c1f1f; color: #ffb3b3; padding: 0 3px; border-radius: 2px; }
.cmp-text .add { background: #1f4d2a; color: #b3ffc4; padding: 0 3px; border-radius: 2px; }

/* ---- light theme ---- */
:root[data-theme="light"] { --bg: #f3f3f3; --bg2: #e9e9e9; --bg3: #dcdcdc; --panel: #f7f7f7; --border: #cfcfcf; --text: #1f1f1f; --muted: #6b6b6b; --viewer: #b9b9b9; }
:root[data-theme="light"] input, :root[data-theme="light"] select, :root[data-theme="light"] textarea { background: #fff; border-color: #bbb; color: #1f1f1f; }
:root[data-theme="light"] .tb-btn:hover, :root[data-theme="light"] button.tb2:hover { background: #d5d5d5; }
:root[data-theme="light"] .list-item:hover, :root[data-theme="light"] .outline-item:hover { background: #e4e4e4; }
:root[data-theme="light"] .modal-box, :root[data-theme="light"] .popover { background: #fafafa; border-color: #bbb; }
:root[data-theme="light"] #toolbar2 { background: #ededed; }
:root[data-theme="light"] .tab.active { background: var(--viewer); }
:root[data-theme="light"] .cmp-text { background: #fff; }
/* ---- layouts ---- */
#viewer.two-up { display: flex; flex-wrap: wrap; justify-content: center; align-content: flex-start; gap: 20px; }
#viewer.two-up .page { margin: 0; }
#viewer.single .page { display: none; }
#viewer.single .page.current-page { display: block; }
/* ---- welcome recent grid ---- */
.recent-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.recent-card { cursor: pointer; text-align: center; padding: 6px; border-radius: 6px; }
.recent-card:hover { background: #454545; }
.recent-thumb { height: 120px; display: flex; align-items: center; justify-content: center; background: #1e1e1e; border-radius: 4px; overflow: hidden; }
.recent-thumb img { max-height: 120px; max-width: 100%; box-shadow: 0 1px 4px rgba(0,0,0,.5); }
.recent-name { font-size: 11px; margin-top: 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
/* ---- comments threads ---- */
.reply { margin: 4px 0 0 12px; padding: 4px 6px; border-left: 2px solid #555; font-size: 12px; }
.thread-actions { margin-top: 4px; display: flex; gap: 6px; align-items: center; }
.thread-actions select { font-size: 11px; padding: 1px 4px; }
.np-replies { margin-top: 6px; border-top: 1px solid #ddd; padding-top: 4px; }
.np-replies .reply { border-left-color: #c9b862; }
/* ---- outline actions ---- */
.outline-item { display: flex; gap: 6px; align-items: center; }
.outline-item .ol-title { flex: 1; overflow: hidden; text-overflow: ellipsis; }
.outline-item .ol-actions { display: none; }
.outline-item:hover .ol-actions { display: inline; }
/* ---- existing links ---- */
.page .formLayer .link-hot { position: absolute; cursor: pointer; border-radius: 2px; }
.page .formLayer .link-hot:hover { background: rgba(21,101,192,.12); outline: 1px solid rgba(21,101,192,.6); }

.sig-upload-row { display: flex; gap: 8px; margin-bottom: 10px; }
.sig-upload-row button { min-height: 36px; padding: 6px 14px; }

.page .formLayer .ff-sig { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 1px; background: rgba(255, 244, 170, .85); border: 1px dashed #b8860b; color: #6b4e00; cursor: pointer; overflow: hidden; line-height: 1.1; user-select: none; }
.page .formLayer .ff-sig:hover { background: rgba(255, 236, 120, .95); }
.page .formLayer .ff-sig small { font-size: .75em; opacity: .8; white-space: nowrap; }