:root {
  --bg: #f4f6f9;
  --panel: #ffffff;
  --panel-2: #f8fafc;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #1e293b;
  --text-soft: #64748b;
  --accent: #2563eb;
  --accent-soft: #eff6ff;
  --accent-2: #0ea5e9;
  --danger: #e11d48;
  --shadow: 0 1px 3px rgba(15,23,42,.08), 0 1px 2px rgba(15,23,42,.06);
  --radius: 8px;
  --topbar-h: 52px;
  --toolbar-h: 46px;
  --status-h: 28px;
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0; height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    "Noto Sans", "Microsoft YaHei", "PingFang SC", "Hiragino Sans", "Malgun Gothic", sans-serif;
  color: var(--text);
  background: var(--bg);
  overflow: hidden;
}
body { display: flex; flex-direction: column; }

/* ---------- Top bar ---------- */
.topbar {
  height: var(--topbar-h);
  flex: 0 0 var(--topbar-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 16px;
  background: linear-gradient(90deg, #0f172a, #1e293b);
  color: #fff;
  box-shadow: var(--shadow);
  z-index: 30;
}
.brand { font-weight: 700; font-size: 18px; letter-spacing: .3px; display: flex; align-items: center; gap: 8px; }
.brand-mark { font-size: 20px; }
.brand-sub { font-weight: 400; color: #94a3b8; font-size: 14px; }
.top-actions { display: flex; align-items: center; gap: 10px; }
.topbtn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 14px; border-radius: 6px;
  background: rgba(255,255,255,.08); color: #e2e8f0;
  text-decoration: none; font-size: 13px; font-weight: 600;
  border: 1px solid rgba(255,255,255,.14);
  transition: background .15s, color .15s;
  white-space: nowrap;
}
.topbtn:hover { background: rgba(255,255,255,.18); color: #fff; }
.topbtn-accent { background: var(--accent); border-color: var(--accent); color: #fff; }
.topbtn-accent:hover { background: #1d4ed8; }
.lang-wrap { display: flex; align-items: center; gap: 6px; margin-left: 4px; }
.lang-label { font-size: 12px; color: #94a3b8; }
#langSelect {
  background: #1e293b; color: #e2e8f0; border: 1px solid rgba(255,255,255,.18);
  border-radius: 6px; padding: 6px 8px; font-size: 13px; cursor: pointer;
}

/* ---------- Toolbar ---------- */
.toolbar {
  height: var(--toolbar-h);
  flex: 0 0 var(--toolbar-h);
  display: flex; align-items: center; gap: 4px;
  padding: 0 10px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
  z-index: 20; overflow-x: auto;
}
.tb-btn {
  display: inline-flex; align-items: center; gap: 5px;
  min-width: 36px; height: 34px; padding: 0 9px;
  border: 1px solid transparent; border-radius: 6px;
  background: transparent; color: var(--text); cursor: pointer;
  font-size: 13px; font-weight: 500; white-space: nowrap;
}
.tb-btn:hover { background: var(--panel-2); border-color: var(--border); }
.tb-btn.active { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.tb-btn .ico { font-size: 16px; line-height: 1; }
.tb-sep { width: 1px; height: 24px; background: var(--border); margin: 0 6px; }

/* ---------- Workspace ---------- */
.workspace { flex: 1 1 auto; display: flex; min-height: 0; }

/* Library */
.library {
  width: 230px; flex: 0 0 230px;
  background: var(--panel); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; min-height: 0;
}
.library-head, .props-head {
  padding: 10px 14px; font-weight: 700; font-size: 13px;
  color: var(--text-soft); text-transform: uppercase; letter-spacing: .5px;
  border-bottom: 1px solid var(--border); background: var(--panel-2);
}
.library-cats { display: flex; flex-wrap: wrap; gap: 4px; padding: 8px; border-bottom: 1px solid var(--border); }
.cat-chip {
  font-size: 12px; padding: 4px 9px; border-radius: 20px; cursor: pointer;
  background: var(--panel-2); border: 1px solid var(--border); color: var(--text-soft);
}
.cat-chip.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.library-items {
  flex: 1 1 auto; overflow-y: auto; padding: 10px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px; align-content: start;
}
.lib-item {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 8px 4px; border: 1px solid var(--border); border-radius: var(--radius);
  background: #fff; cursor: grab; user-select: none; transition: border-color .15s, box-shadow .15s;
}
.lib-item:hover { border-color: var(--accent); box-shadow: var(--shadow); }
.lib-item:active { cursor: grabbing; }
.lib-item svg { width: 46px; height: 40px; pointer-events: none; }
.lib-item .label { font-size: 10.5px; color: var(--text-soft); text-align: center; line-height: 1.2; }
.lib-sub {
  grid-column: 1 / -1; margin: 6px 2px 2px; padding: 4px 8px;
  font-size: 11px; font-weight: 700; letter-spacing: .03em; text-transform: none;
  color: var(--accent); border-left: 3px solid var(--accent); background: var(--accent-soft, #f1f5f9);
  border-radius: 4px; user-select: none;
}
.lib-sub2 {
  grid-column: 1 / -1; margin: 4px 2px 1px 14px; padding: 2px 8px;
  font-size: 10px; font-weight: 600; letter-spacing: .02em; text-transform: none;
  color: var(--text-soft, #64748b); border-left: 2px solid var(--border, #e2e8f0); background: transparent;
  user-select: none;
}
.node-tag { font-family: sans-serif; pointer-events: none; }
/* 仪表/设备连线锚点可视化引线（导出时保留） */
.anc-lead { pointer-events: none; }

/* Canvas */
.canvas-wrap { flex: 1 1 auto; position: relative; overflow: hidden; background: var(--bg); }
#canvas { width: 100%; height: 100%; display: block; cursor: default; touch-action: none; }
#canvas.tool-select { cursor: default; }
#canvas.tool-pan { cursor: grab; }
#canvas.tool-connector { cursor: crosshair; }
#canvas.panning { cursor: grabbing; }
.hint {
  position: absolute; left: 50%; bottom: 14px; transform: translateX(-50%);
  background: rgba(15,23,42,.78); color: #fff; padding: 6px 14px; border-radius: 20px;
  font-size: 12px; pointer-events: none; opacity: .9;
}
.node { cursor: move; }
.node.selected .sel-outline { stroke: var(--accent); stroke-width: 1.5; stroke-dasharray: 4 3; fill: none; pointer-events: none; }
.edge-path { fill: none; }
.edge-hit { fill: none; stroke: transparent; stroke-width: 12; cursor: pointer; }
.handle { fill: #fff; stroke: var(--accent); stroke-width: 1.5; }
.handle.rotate { fill: var(--accent); }
.sel-rubber { fill: rgba(37,99,235,.12); stroke: var(--accent); stroke-width: 1; stroke-dasharray: 4 3; }
.port-dot { fill: var(--accent); stroke: #fff; stroke-width: 1.5; cursor: crosshair; }
.port-dot.hover { fill: var(--accent-2); }
.edge-label, .edge-label-bg { pointer-events: none; }

/* Properties */
.properties {
  width: 260px; flex: 0 0 260px;
  background: var(--panel); border-left: 1px solid var(--border);
  display: flex; flex-direction: column; min-height: 0;
}
.props-body { flex: 1 1 auto; overflow-y: auto; padding: 12px 14px; }
.props-empty { color: var(--text-soft); font-size: 13px; text-align: center; padding: 30px 10px; }
.prop-group { margin-bottom: 14px; }
.prop-group > .grp-title {
  font-size: 11px; font-weight: 700; color: var(--text-soft); text-transform: uppercase;
  letter-spacing: .5px; margin-bottom: 8px;
}
.prop-row { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.prop-row label { flex: 0 0 86px; font-size: 12px; color: var(--text-soft); }
.prop-row input[type="text"], .prop-row input[type="number"], .prop-row select {
  flex: 1 1 auto; min-width: 0; padding: 6px 8px; border: 1px solid var(--border-strong);
  border-radius: 6px; font-size: 13px; background: #fff; color: var(--text);
}
.prop-row input[type="color"] { width: 38px; height: 30px; padding: 2px; border: 1px solid var(--border-strong); border-radius: 6px; background: #fff; }
.prop-row input[type="range"] { flex: 1 1 auto; }
.color-swatch { display: flex; align-items: center; gap: 8px; }
.btn-sm {
  padding: 6px 10px; font-size: 12px; border-radius: 6px; border: 1px solid var(--border-strong);
  background: #fff; color: var(--text); cursor: pointer;
}
.btn-sm:hover { background: var(--panel-2); }
.btn-row { display: flex; gap: 6px; flex-wrap: wrap; }
.btn-row .btn-sm { flex: 1 1 auto; }

/* Status bar */
.statusbar {
  height: var(--status-h); flex: 0 0 var(--status-h);
  display: flex; align-items: center; gap: 6px;
  padding: 0 14px; background: var(--panel-2); border-top: 1px solid var(--border);
  font-size: 12px; color: var(--text-soft);
}
.statusbar b { color: var(--text); }
.st-sep { color: var(--border-strong); }
.st-right { margin-left: auto; color: var(--accent); }

/* Library search */
.library-search { padding: 8px 10px; border-bottom: 1px solid var(--border); }
.library-search input {
  width: 100%; padding: 7px 10px; border: 1px solid var(--border-strong);
  border-radius: 6px; font-size: 13px; background: #fff; color: var(--text);
}
.library-search input:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }

/* Page bar */
.pagebar {
  height: 38px; flex: 0 0 38px; display: flex; align-items: center; gap: 6px;
  padding: 0 10px; background: var(--panel-2); border-bottom: 1px solid var(--border);
  overflow-x: auto; z-index: 15;
}
.page-tab {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px;
  border: 1px solid var(--border); border-radius: 16px; background: #fff;
  font-size: 12.5px; color: var(--text-soft); cursor: pointer; white-space: nowrap;
}
.page-tab.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.page-tab .pt-name { max-width: 120px; overflow: hidden; text-overflow: ellipsis; }
.page-tab .pt-x { opacity: .7; font-weight: 700; }
.page-tab .pt-x:hover { opacity: 1; }
.page-add {
  width: 28px; height: 28px; border-radius: 50%; border: 1px dashed var(--border-strong);
  background: #fff; color: var(--text-soft); cursor: pointer; font-size: 16px; line-height: 1;
}
.page-add:hover { border-color: var(--accent); color: var(--accent); }

/* Properties tabs */
.props-tabs { display: flex; border-bottom: 1px solid var(--border); background: var(--panel-2); }
.props-tab {
  flex: 1; padding: 10px 8px; border: none; background: transparent; cursor: pointer;
  font-size: 13px; font-weight: 600; color: var(--text-soft); border-bottom: 2px solid transparent;
}
.props-tab.active { color: var(--accent); border-bottom-color: var(--accent); }

/* Layers */
.layers-body { flex: 1 1 auto; overflow-y: auto; padding: 10px 12px; }
.layer-row {
  display: flex; align-items: center; gap: 6px; padding: 6px 8px; border: 1px solid var(--border);
  border-radius: 6px; margin-bottom: 6px; background: #fff;
}
.layer-row.active { border-color: var(--accent); background: var(--accent-soft); }
.layer-row .lr-name { flex: 1 1 auto; font-size: 13px; border: none; background: transparent; color: var(--text); }
.layer-row .lr-btn {
  border: none; background: transparent; cursor: pointer; font-size: 14px; color: var(--text-soft);
  padding: 2px 4px; border-radius: 4px;
}
.layer-row .lr-btn:hover { background: var(--panel-2); color: var(--text); }
.layer-row .lr-btn.on { color: var(--accent); }
.layer-add {
  width: 100%; padding: 7px; margin-top: 4px; border: 1px dashed var(--border-strong);
  border-radius: 6px; background: #fff; cursor: pointer; color: var(--text-soft); font-size: 13px;
}
.layer-add:hover { border-color: var(--accent); color: var(--accent); }
.layers-hint { font-size: 11.5px; color: var(--text-soft); margin: 8px 2px 0; line-height: 1.4; }

/* Toolbar select */
.tb-select {
  height: 34px; padding: 0 8px; border: 1px solid var(--border); border-radius: 6px;
  background: #fff; color: var(--text); font-size: 13px; cursor: pointer;
}

/* Modal */
.modal-mask {
  position: fixed; inset: 0; background: rgba(15,23,42,.45); display: flex;
  align-items: center; justify-content: center; z-index: 100;
}
.modal-mask[hidden] { display: none; }
.modal {
  width: min(760px, 92vw); max-height: 86vh; overflow-y: auto; background: #fff;
  border-radius: 12px; box-shadow: 0 20px 60px rgba(15,23,42,.3); padding: 18px;
}
.modal-head {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 16px; font-weight: 700; margin-bottom: 14px; color: var(--text);
}
.modal-close { border: none; background: transparent; font-size: 18px; cursor: pointer; color: var(--text-soft); }
.modal-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
.tpl-card {
  border: 1px solid var(--border); border-radius: 10px; padding: 12px; cursor: pointer;
  text-align: center; transition: border-color .15s, box-shadow .15s; background: #fff;
}
.tpl-card:hover { border-color: var(--accent); box-shadow: var(--shadow); }
.tpl-card .tpl-ico { font-size: 30px; line-height: 1; margin-bottom: 8px; }
.tpl-card .tpl-name { font-size: 13px; font-weight: 600; color: var(--text); }
.tpl-card .tpl-desc { font-size: 11px; color: var(--text-soft); margin-top: 3px; }

/* Page tab extras */
.page-name { max-width: 130px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.page-del { opacity: .55; font-weight: 700; padding: 0 2px; border-radius: 4px; }
.page-del:hover { opacity: 1; color: var(--danger); }

/* Layer panel extras */
.layer-actions { display: flex; gap: 6px; margin-bottom: 10px; }
.layer-actions .btn-sm { flex: 1 1 auto; }
.layer-vis, .layer-lock { cursor: pointer; font-size: 14px; padding: 2px 3px; border-radius: 4px; user-select: none; }
.layer-vis:hover, .layer-lock:hover { background: var(--panel-2); }
.layer-name { flex: 1 1 auto; font-size: 13px; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Theme overrides */
body.theme-blueprint {
  --bg: #0b3d91; --panel: #123a7a; --panel-2: #0f3268; --text: #eaf2ff; --text-soft: #b9d2f5;
  --border: #2a5aa8; --border-strong: #356bbd; --accent: #7fb0ff; --accent-soft: #1c4f9e;
  --shadow: 0 1px 3px rgba(0,0,0,.25);
}
body.theme-dark {
  --bg: #16161e; --panel: #1e1e2e; --panel-2: #232334; --text: #e2e8f0; --text-soft: #a6adc8;
  --border: #34344a; --border-strong: #44445e; --accent: #89b4fa; --accent-soft: #2a2f45;
  --shadow: 0 1px 3px rgba(0,0,0,.4);
}
body.theme-hand {
  --bg: #fdfaf3; --panel: #fffdf7; --panel-2: #f7f1e3; --text: #3a3326; --text-soft: #8a7f68;
  --border: #e7ddc7; --border-strong: #d8caa8; --accent: #c08a2d; --accent-soft: #f3e8cf;
  --shadow: 0 1px 3px rgba(120,90,30,.12);
}

/* Responsive */
@media (max-width: 980px) {
  .library { width: 170px; flex-basis: 170px; }
  .properties { width: 210px; flex-basis: 210px; }
}
@media (max-width: 720px) {
  .library { display: none; }
  .properties { width: 180px; flex-basis: 180px; }
  .brand-sub { display: none; }
}