:root {
  --bg: #0d1117; --panel: #161b22; --panel2: #1c2230; --line: #2a3140;
  --text: #e6edf3; --muted: #9aa7b4; --accent: #22d3ee; --accent2: #3b82f6;
  --good: #3fb950; --warn: #f5c518; --danger: #ff5470; --pill: #233044;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  -webkit-font-smoothing: antialiased; overflow: hidden;
}
.app { display: flex; flex-direction: column; height: 100vh; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px; background: linear-gradient(180deg, #111a2b, #0d1117);
  border-bottom: 1px solid var(--line); flex: 0 0 auto;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand .logo { font-size: 26px; color: var(--accent); }
.brand h1 { margin: 0; font-size: 17px; letter-spacing: .02em; }
.brand .subtitle { color: var(--muted); font-size: 12px; }
.topbar-actions { display: flex; gap: 8px; align-items: center; }
.btn {
  display: inline-flex; align-items: center; gap: 6px; cursor: pointer;
  background: var(--panel2); color: var(--text); border: 1px solid var(--line);
  border-radius: 8px; padding: 8px 12px; font-size: 13px; user-select: none;
}
.btn:hover { border-color: #3a4557; }
.btn-primary { background: linear-gradient(180deg, #2563eb, #1d4ed8); border-color: #1d4ed8; }
.btn-primary:hover { filter: brightness(1.08); }

.workspace { display: flex; flex: 1 1 auto; min-height: 0; }
.sidebar {
  width: 300px; flex: 0 0 auto; background: var(--panel);
  border-right: 1px solid var(--line); overflow-y: auto; padding: 8px;
}
.panel { border: 1px solid var(--line); border-radius: 10px; padding: 12px; margin-bottom: 10px; background: var(--panel); }
.panel h3 { margin: 0 0 8px; font-size: 13px; color: var(--muted); font-weight: 600; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.row { display: flex; align-items: center; gap: 8px; margin: 8px 0; }
.row label { font-size: 12.5px; color: var(--text); min-width: 40px; }
select, input[type=text], input[type=number] {
  background: var(--panel2); color: var(--text); border: 1px solid var(--line);
  border-radius: 6px; padding: 5px 8px; font-size: 12.5px; flex: 1; min-width: 0;
}
input[type=range] { flex: 1; accent-color: var(--accent); }
.chk { display: flex; align-items: center; gap: 8px; font-size: 12.5px; margin: 8px 0; cursor: pointer; }
.mini-btn {
  background: var(--panel2); color: var(--text); border: 1px solid var(--line);
  border-radius: 6px; padding: 5px 8px; font-size: 12px; cursor: pointer; flex: 1;
}
.mini-btn:hover { border-color: #3a4557; }
.meta { font-size: 12px; color: var(--text); }
.meta .mrow, .attr .mrow { display: flex; justify-content: space-between; gap: 8px; padding: 2px 0; border-bottom: 1px dashed var(--line); }
.meta .mrow span, .attr .mrow span { color: var(--muted); flex: 0 0 auto; }
.meta .mrow b, .attr .mrow b { text-align: right; word-break: break-word; }
.attr h5 { margin: 10px 0 4px; font-size: 12px; color: var(--accent); }

/* Tree */
.tree { max-height: 340px; overflow: auto; margin-top: 6px; }
.tnode { padding-left: 0; }
.trow { display: flex; align-items: center; gap: 5px; padding: 2px 0; font-size: 12px; white-space: nowrap; }
.trow:hover { background: var(--panel2); border-radius: 4px; }
.trow.sel { background: rgba(34,211,238,.18); border-radius: 4px; }
.tcaret { width: 12px; cursor: pointer; color: var(--muted); flex: 0 0 auto; text-align: center; }
.tcaret.leaf { visibility: hidden; }
.tchk { flex: 0 0 auto; }
.tlabel { flex: 1; overflow: hidden; text-overflow: ellipsis; cursor: pointer; }
.tlabel .ty { color: var(--muted); font-size: 10.5px; margin-left: 4px; }
.tchildren { padding-left: 14px; border-left: 1px solid var(--line); margin-left: 5px; }
.tchildren.collapsed { display: none; }

.viewer-wrap { position: relative; flex: 1 1 auto; min-width: 0; display: flex; flex-direction: column; }
.toolbar {
  display: flex; align-items: center; gap: 6px; padding: 8px 10px;
  background: var(--panel); border-bottom: 1px solid var(--line); flex-wrap: wrap;
}
.tool-group { display: flex; gap: 4px; }
.tool {
  background: var(--panel2); color: var(--text); border: 1px solid var(--line);
  border-radius: 7px; padding: 7px 10px; font-size: 12.5px; cursor: pointer; white-space: nowrap;
}
.tool:hover { border-color: #3a4557; }
.tool.active { background: linear-gradient(180deg, #2563eb, #1d4ed8); border-color: #1d4ed8; }
.sep { width: 1px; height: 22px; background: var(--line); margin: 0 4px; }
.tool-status { color: var(--muted); font-size: 12px; margin-left: auto; }
.viewer { position: relative; flex: 1 1 auto; min-height: 0; overflow: hidden; }
.viewer canvas { display: block; }

.overlay { position: absolute; z-index: 30; }
.coord-readout {
  left: 12px; bottom: 12px; background: rgba(13,17,23,.86); border: 1px solid var(--line);
  border-radius: 8px; padding: 7px 10px; font-size: 12px; font-variant-numeric: tabular-nums; pointer-events: none;
}
.measure-box {
  right: 12px; top: 52px; background: rgba(13,17,23,.9); border: 1px solid var(--line);
  border-radius: 10px; padding: 12px 14px; font-size: 12.5px; min-width: 190px;
}
.measure-box h4 { margin: 0 0 8px; font-size: 13px; }
.measure-box .mrow { display: flex; justify-content: space-between; padding: 2px 0; }
.measure-box .mrow span { color: var(--muted); }

.drop-hint {
  position: absolute; inset: 0; z-index: 40; display: none; align-items: center; justify-content: center;
  background: rgba(13,17,23,.75); backdrop-filter: blur(2px);
}
.drop-hint.show { display: flex; }
.drop-inner { text-align: center; border: 2px dashed var(--accent); border-radius: 16px; padding: 40px 56px; }
.drop-icon { font-size: 40px; color: var(--accent); }

.loading {
  position: absolute; inset: 0; z-index: 50; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 12px; background: rgba(13,17,23,.7);
}
.spinner { width: 42px; height: 42px; border: 4px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.progress { width: 240px; height: 6px; background: var(--panel2); border-radius: 999px; overflow: hidden; }
.progress-bar { height: 100%; width: 0; background: linear-gradient(90deg, var(--accent), var(--accent2)); transition: width .15s; }

.dropdown { position: relative; }
.dropdown-menu {
  display: none; position: absolute; top: 100%; left: 0; margin-top: 4px; z-index: 60;
  background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 4px; min-width: 180px;
  box-shadow: 0 8px 24px rgba(0,0,0,.4);
}
.dropdown.open .dropdown-menu { display: block; }
.dropdown-menu button {
  display: block; width: 100%; text-align: left; background: none; color: var(--text);
  border: none; border-radius: 6px; padding: 8px 10px; font-size: 12.5px; cursor: pointer;
}
.dropdown-menu button:hover { background: var(--panel2); }

.modal { position: fixed; inset: 0; z-index: 100; display: flex; align-items: center; justify-content: center; background: rgba(0,0,0,.6); }
.modal-card { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; width: min(680px, 92vw); max-height: 86vh; overflow-y: auto; }
.modal-head { display: flex; align-items: center; justify-content: space-between; padding: 14px 18px; border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--panel); }
.modal-head h3 { margin: 0; font-size: 15px; }
.modal-body { padding: 16px 18px; font-size: 13.5px; line-height: 1.7; }
.modal-body h4 { margin: 16px 0 6px; font-size: 13.5px; color: var(--accent); }
.modal-body ul { margin: 4px 0; padding-left: 20px; }