:root {
  --bg-deep: #ffffff;
  --bg-mid: #f7f9fc;
  --bg-panel: #ffffff;
  --bg-elev: #eef2f7;
  --bg-input: #ffffff;
  --border: #d5dce6;
  --border-light: #c3ccd9;
  --text: #1f2733;
  --text-dim: #667085;
  --accent: #0284c7;
  --accent2: #dc5a2a;
  --ok: #2e7d32;
  --warn: #b45309;
  --err: #c62828;
  --font: "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  --mono: Consolas, "Courier New", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body { height: 100%; overflow: hidden; }

body {
  font-family: var(--font);
  font-size: 13px;
  color: var(--text);
  background: var(--bg-deep);
  display: flex;
  flex-direction: column;
  user-select: none;
}

/* ================= 标题栏 ================= */
#titlebar {
  height: 34px;
  background: linear-gradient(180deg, #2a3040, #232733);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 8px;
  flex-shrink: 0;
}
.app-logo { display: flex; align-items: center; gap: 8px; }
.app-title { font-weight: 600; font-size: 13px; letter-spacing: .3px; }
.app-sub {
  font-size: 11px; color: var(--text-dim);
  border-left: 1px solid var(--border); padding-left: 8px;
}
.titlebar-right { display: flex; align-items: center; gap: 2px; }
.tb-btn {
  background: transparent; border: none; color: var(--text-dim);
  width: 26px; height: 24px; border-radius: 4px; cursor: pointer; font-size: 12px;
}
.tb-btn:hover:not(:disabled) { background: var(--bg-elev); color: var(--text); }
.tb-btn:disabled { opacity: .35; cursor: default; }
.tb-btn.close:hover { background: #e53935; color: #fff; }
.tb-sep { width: 1px; height: 16px; background: var(--border); margin: 0 5px; }

/* ================= 菜单栏 ================= */
#menubar {
  height: 30px;
  background: var(--bg-mid);
  display: flex; align-items: center;
  padding: 0 4px; gap: 2px;
  position: relative;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
}
.menu-item {
  padding: 4px 12px; border-radius: 4px; cursor: pointer; color: var(--text);
  position: relative;
}
.menu-item:hover, .menu-item.active { background: var(--bg-elev); color: #fff; }
.menu-context {
  display: none; position: absolute; top: 26px; left: 0; z-index: 60;
  background: var(--bg-panel); border: 1px solid var(--border-light);
  border-radius: 6px; box-shadow: 0 8px 24px rgba(0,0,0,.5);
  min-width: 220px; padding: 4px;
}
.menu-context.show { display: block; }
.ctx-item { padding: 6px 12px; border-radius: 4px; cursor: pointer; display: flex; justify-content: space-between; }
.ctx-item:hover { background: #2f7dcc; color: #fff; }
.ctx-item.active { background: var(--bg-elev); }
.ctx-item.active::before { content: "✓ "; color: var(--accent); }
.ctx-item kbd {
  font-family: var(--mono); font-size: 10px; color: var(--text-dim);
  border: 1px solid var(--border); border-radius: 3px; padding: 0 4px;
}
.ctx-sep { height: 1px; background: var(--border); margin: 4px 6px; }

/* ================= 功能区 ================= */
#ribbon {
  height: 64px; background: var(--bg-mid);
  display: flex; align-items: center;
  border-bottom: 2px solid #2f7dcc;
  padding: 0 4px;
  flex-shrink: 0;
}
.ribbon-group {
  display: flex; align-items: center; gap: 2px;
  height: 100%; padding: 4px 8px;
  border-right: 1px solid var(--border);
}
.ribbon-group:last-child { border-right: none; }
.ribbon-label {
  writing-mode: vertical-lr; text-orientation: upright;
  font-size: 9px; color: var(--text-dim); letter-spacing: 2px;
  margin-right: 4px;
}
.ribbon-btn {
  background: transparent; border: 1px solid transparent; border-radius: 5px;
  color: var(--text); cursor: pointer;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 1px; width: 56px; height: 54px; padding: 3px 2px; font-size: 9.5px;
}
.ribbon-btn .ic { font-size: 17px; }
.ribbon-btn:hover { background: var(--bg-elev); border-color: var(--border-light); }
.ribbon-btn.primary { background: #1e6fbf; border-color: #2f7dcc; color: #fff; font-weight: 600; }
.ribbon-btn.primary:hover { background: #2f7dcc; }
.ribbon-select {
  width: 58px; height: 54px; padding: 4px 2px; font-size: 9.5px;
  background: var(--bg-input); color: var(--text); border: 1px solid var(--border-light);
  border-radius: 5px; cursor: pointer; outline: none; text-align: center;
}
.ribbon-select:hover { border-color: var(--accent); }
#import-label { display: none; }
.demo-load { margin-top: 6px; padding-top: 6px; border-top: 1px dashed var(--border); }
.demo-load-title { font-size: 10px; color: var(--text-dim); margin-bottom: 6px; }
.demo-btns { display: flex; flex-wrap: wrap; gap: 6px; }
.mini-btn.demo {
  background: var(--bg-input); border: 1px solid #2b6c8f; color: #7dd8ff;
  padding: 5px 9px; font-size: 11px; cursor: pointer; border-radius: 4px;
  transition: background .15s, border-color .15s, color .15s;
}
.mini-btn.demo:hover { background: rgba(79,195,247,.14); border-color: var(--accent); color: #fff; }
.mini-btn.demo:active { transform: translateY(1px); }

/* ================= 主工作区 ================= */
#workspace {
  flex: 1; display: flex; min-height: 0;
}
.panel { background: var(--bg-panel); display: flex; flex-direction: column; }
.panel-header {
  height: 30px; display: flex; align-items: center; justify-content: space-between;
  padding: 0 8px; font-weight: 600; font-size: 12px; color: var(--text-dim);
  background: var(--bg-elev); border-bottom: 1px solid var(--border);
}
.mini-btn { background: transparent; border: none; color: var(--text-dim); cursor: pointer; font-size: 12px; }
.mini-btn:hover { color: #fff; }

/* 模型树 */
#tree-panel { width: 210px; flex-shrink: 0; border-right: 1px solid var(--border); }
.tree { padding: 8px 4px; overflow: auto; flex: 1; }
.tree-node { padding: 3px 4px; border-radius: 4px; cursor: pointer; white-space: nowrap; }
.tree-node:hover { background: var(--bg-elev); }
.tree-node.leaf.selected { background: #1e3a5f; color: var(--accent); }
.tree-caret, .tree-caret-placeholder { display: inline-block; width: 14px; }
.tree-ic { margin: 0 3px; }
.tree-children { margin-left: 14px; }

/* 3D 视图 */
#viewer-wrap { flex: 1; position: relative; background: radial-gradient(ellipse at center, #2b3040 0%, #181b22 100%); min-width: 0; }
#viewer { position: absolute; inset: 30px 0 32px 0; }
#viewer-tabs { position: absolute; top: 0; left: 0; right: 0; height: 30px; display: flex; align-items: flex-end; padding: 0 8px; gap: 2px; z-index: 10; }
.viewer-tab {
  padding: 6px 14px; font-size: 12px; color: var(--text-dim);
  border: 1px solid transparent; border-bottom: none; cursor: pointer;
  border-radius: 6px 6px 0 0;
}
.viewer-tab.active { background: rgba(47,125,204,.15); color: var(--accent); border-color: var(--border); }
#viewer-toolbar {
  position: absolute; left: 0; right: 0; bottom: 0; height: 32px; z-index: 10;
  display: flex; align-items: center; gap: 4px; padding: 0 8px;
  background: rgba(255,255,255,.85); backdrop-filter: blur(4px);
  border-top: 1px solid var(--border);
}
.vt-btn {
  background: transparent; border: 1px solid transparent; color: var(--text-dim);
  padding: 3px 10px; border-radius: 4px; cursor: pointer; font-size: 11px;
}
.vt-btn:hover, .vt-btn.on { color: var(--accent); background: var(--bg-elev); border-color: var(--border); }
.vt-spacer { flex: 1; }
.vt-slider { display: flex; align-items: center; gap: 6px; font-size: 11px; color: var(--text-dim); }
.vt-slider input { width: 110px; accent-color: var(--accent); }
#viewer-legend {
  position: absolute; right: 12px; top: 40px; z-index: 10;
  background: rgba(255,255,255,.92); border: 1px solid var(--border); border-radius: 6px;
  padding: 8px; width: 52px; text-align: center;
}
.legend-title { font-size: 10px; color: var(--text-dim); margin-bottom: 4px; }
.legend-bar {
  height: 130px; border-radius: 3px;
  background: linear-gradient(180deg, #2979ff 0%, #69f0ae 25%, #ffd600 55%, #ff9100 80%, #ff1744 100%);
}
.legend-labels { display: flex; flex-direction: column; font-size: 10px; color: var(--text-dim); }
#viewer-hint {
  position: absolute; left: 50%; bottom: 38px; transform: translateX(-50%);
  font-size: 11px; color: rgba(102,112,133,.75); z-index: 10;
}
#drop-hint {
  position: absolute; inset: 0; z-index: 20; display: none;
  align-items: center; justify-content: center;
  background: rgba(30,111,191,.18); border: 3px dashed #4fc3f7;
  font-size: 20px; font-weight: 600; color: #4fc3f7; pointer-events: none;
}
#viewer-wrap.drag-over #drop-hint { display: flex; }
#viewer-wrap.drag-over { outline: 2px solid var(--accent); }

/* 属性面板 */
#props-panel { width: 270px; flex-shrink: 0; border-left: 1px solid var(--border); }
.props-tabs { display: flex; background: var(--bg-elev); }
.prop-tab { flex: 1; text-align: center; padding: 7px 0; cursor: pointer; font-size: 12px; color: var(--text-dim); border-bottom: 2px solid transparent; }
.prop-tab:hover { color: var(--text); }
.prop-tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.props-body { padding: 8px 10px; overflow-y: auto; flex: 1; }
.hidden { display: none !important; }
.prop-section { margin-bottom: 14px; }
.prop-title { font-size: 11px; color: var(--accent); margin-bottom: 6px; padding-bottom: 3px; border-bottom: 1px solid var(--border); }
.prop-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 4px 0; font-size: 12px;
}
.prop-row input, .prop-row select, .prop-input, .prop-select {
  width: 120px; background: var(--bg-input); color: var(--text);
  border: 1px solid var(--border); border-radius: 4px;
  padding: 4px 6px; font-family: var(--mono); font-size: 12px;
  outline: none;
}
.prop-row input:focus, .prop-select:focus { border-color: var(--accent); }
.prop-row.static b { font-family: var(--mono); color: var(--warn); }
.prop-select { width: 100%; font-family: var(--font); cursor: pointer; }
.face-ctrl { display: flex; align-items: center; justify-content: space-between; gap: 6px; margin-top: 6px; }
.face-state { font-size: 11px; color: var(--warn); font-family: var(--mono); flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.face-state.on { color: #ffca28; }
.face-ctrl .mini-btn { font-size: 11px; padding: 3px 7px; border: 1px solid var(--border); border-radius: 4px; margin: 0; width: auto; flex-shrink: 0; }
.face-ctrl .mini-btn.danger:hover { background: rgba(239,83,80,.12); }
.face-tip { margin-top: 6px; font-size: 10px; line-height: 1.5; color: var(--text-dim); background: var(--bg-input); border: 1px dashed #2b6c8f; border-radius: 4px; padding: 5px 7px; }
.face-tip.picking { color: #ffca28; border-color: #ffca28; background: rgba(255,202,40,.06); }

/* 导入模型区域 */
.import-info {
  background: var(--bg-input); border: 1px dashed var(--border-light);
  border-radius: 6px; padding: 10px; text-align: center;
}
.import-empty { color: var(--text-dim); font-size: 12px; line-height: 1.8; padding: 6px 0; }
.import-empty span { font-size: 11px; opacity: .7; }
.import-file { text-align: left; }
.import-fname {
  font-family: var(--mono); font-size: 12px; color: var(--accent);
  word-break: break-all; padding: 2px 0 6px; border-bottom: 1px dashed var(--border); margin-bottom: 4px;
}
.mini-btn.danger { color: var(--err); width: 100%; margin-top: 6px; padding: 4px; border: 1px solid var(--border); border-radius: 4px; }
.mini-btn.danger:hover { background: rgba(239,83,80,.12); color: #ff8a80; }
.lock-hint { color: var(--warn); font-size: 10px; font-weight: normal; }
.prop-row input:disabled { opacity: .45; }
.mat-info { margin-top: 8px; background: var(--bg-input); border: 1px solid var(--border); border-radius: 6px; padding: 6px 8px; }
.mat-kv { display: flex; justify-content: space-between; padding: 3px 0; font-size: 12px; color: var(--text-dim); }
.mat-kv b { color: var(--text); font-family: var(--mono); font-weight: 500; }

/* ================= 底部面板 ================= */
#bottom-panel {
  height: 160px; background: var(--bg-panel);
  border-top: 1px solid var(--border);
  display: flex; flex-direction: column; flex-shrink: 0;
}
.bottom-tabs { display: flex; background: var(--bg-elev); }
.bt-tab { padding: 6px 16px; cursor: pointer; font-size: 12px; color: var(--text-dim); border-bottom: 2px solid transparent; }
.bt-tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.bottom-body { flex: 1; overflow: auto; padding: 8px 12px; font-family: var(--mono); font-size: 12px; }
.log-line { padding: 2px 0; color: var(--text); }
.log-line.muted { color: var(--text-dim); }
.log-line.info { color: var(--accent); }
.log-line.ok { color: var(--ok); }
.log-line.warn { color: var(--warn); }
.log-line.err { color: var(--err); }
.log-line .ts { color: var(--text-dim); margin-right: 8px; }

.result-table { width: 100%; border-collapse: collapse; }
.result-table th, .result-table td {
  border: 1px solid var(--border); padding: 5px 10px; text-align: center;
  font-family: var(--mono); font-size: 12px;
}
.result-table th { background: var(--bg-elev); color: var(--text-dim); font-family: var(--font); font-weight: 600; }
.result-table td.hl { color: var(--accent); font-weight: 700; }
.result-table td.hl2 { color: var(--warn); font-weight: 700; }
.result-table tfoot td { background: var(--bg-elev); font-weight: 700; }
.result-table tr.extra-row td { font-family: var(--font); font-size: 11px; font-weight: 500; text-align: left; color: var(--text); }
.result-table tr.extra-row td:first-child { color: var(--text-dim); width: 90px; }
.result-table tr.extra-row td.hl { color: var(--accent); font-family: var(--mono); }
.result-table tr.extra-row td.hl2 { color: var(--warn); font-family: var(--mono); }

/* ================= 状态栏 ================= */
#statusbar {
  height: 24px; background: #2f7dcc; color: #fff;
  display: flex; align-items: center; gap: 8px;
  padding: 0 10px; font-size: 11px; flex-shrink: 0;
}
.st-sep { width: 1px; height: 12px; background: rgba(255,255,255,.35); }
.st-right { margin-left: auto; }

/* ================= 模态弹窗 ================= */
.modal-mask {
  position: fixed; inset: 0; background: rgba(0,0,0,.55); z-index: 100;
  display: flex; align-items: center; justify-content: center;
}
.modal {
  background: var(--bg-panel); border: 1px solid var(--border-light);
  border-radius: 8px; width: 420px; box-shadow: 0 16px 48px rgba(0,0,0,.6);
  overflow: hidden;
}
.modal-header {
  padding: 12px 16px; background: var(--bg-elev);
  font-weight: 600; display: flex; justify-content: space-between; align-items: center;
}
.modal-body { padding: 16px; font-size: 12.5px; line-height: 1.8; color: var(--text); max-height: 60vh; overflow: auto; }
.modal-body h4 { color: var(--accent); margin: 10px 0 4px; font-size: 13px; }
.modal-body ul { padding-left: 18px; }
.modal-footer { padding: 10px 16px; display: flex; justify-content: flex-end; border-top: 1px solid var(--border); }
.modal-btn {
  background: #1e6fbf; border: 1px solid #2f7dcc; color: #fff;
  padding: 6px 18px; border-radius: 4px; cursor: pointer; font-size: 12px;
}
.modal-btn:hover { background: #2f7dcc; }

/* ================= 图表 ================= */
.chart-box {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  padding: 16px; gap: 12px; overflow: auto;
}
.chart-card {
  background: rgba(255,255,255,.96); border: 1px solid var(--border);
  border-radius: 8px; padding: 12px;
}
.chart-title { font-size: 12px; color: var(--text-dim); margin-bottom: 8px; }
.chart-card canvas { width: 100%; display: block; }

/* 滚动条 */
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #c3ccd9; border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: #4a5468; }

input[type=number]::-webkit-inner-spin-button { opacity: .4; }