:root{
  --bg:#0b0f14;
  --panel:#0f1620;
  --panel2:#0c121a;
  --text:#e6edf3;
  --muted:#93a4b8;
  --border:#1c2a3a;
  --accent:#7c5cff;
  --accent2:#20c997;
  --danger:#ff5c7a;
}
*{ box-sizing:border-box; }
html,body{ height:100%; margin:0; font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji"; background:var(--bg); color:var(--text); }
#app{ height:100%; display:flex; flex-direction:column; }
.topbar{ display:flex; justify-content:space-between; align-items:center; padding:12px 14px; border-bottom:1px solid var(--border); background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0)); }
.brand{ font-weight:700; letter-spacing:0.2px; }
.top-actions{ display:flex; gap:10px; align-items:center; }
.file-btn input{ display:none; }
.file-btn span{ display:inline-flex; align-items:center; padding:9px 12px; border:1px solid var(--border); background:var(--panel); border-radius:10px; cursor:pointer; user-select:none; }
.file-btn span:hover{ border-color:#2b3d55; }
.btn{ padding:9px 12px; border:1px solid var(--border); background:var(--panel); color:var(--text); border-radius:10px; cursor:pointer; }
.btn:hover{ border-color:#2b3d55; }
.btn:disabled{ opacity:0.45; cursor:not-allowed; }
.btn.primary{ background:linear-gradient(180deg, rgba(124,92,255,0.25), rgba(124,92,255,0.10)); border-color:rgba(124,92,255,0.45); }
.layout{ flex:1; display:grid; grid-template-columns: 1fr 360px; min-height:0; }
.viewport{ position:relative; min-height:0; border-right:1px solid var(--border); background:radial-gradient(1000px 600px at 20% 20%, rgba(124,92,255,0.08), transparent 60%), radial-gradient(800px 500px at 90% 0%, rgba(32,201,151,0.06), transparent 55%); }
#overlay2d{ position:absolute; inset:0; pointer-events:none; }
.panel{ background:var(--panel2); padding:14px; overflow:auto; }
.section{ padding:12px; background:rgba(255,255,255,0.02); border:1px solid var(--border); border-radius:14px; margin-bottom:12px; }
.section-title{ font-weight:700; margin-bottom:10px; }
.segmented{ display:flex; border:1px solid var(--border); border-radius:12px; overflow:hidden; }
.seg{ flex:1; padding:10px 10px; background:transparent; border:none; color:var(--text); cursor:pointer; font-size:13px; }
.seg.active{ background:rgba(124,92,255,0.20); }
.help{ margin-top:10px; color:var(--muted); font-size:12.5px; line-height:1.35; }
.points{ margin:0; padding-left:20px; color:var(--text); }
.points li{ margin:6px 0; font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; color:#cfe2ff; font-size:12px; }
.row{ margin-top:10px; }
.row-split{ display:flex; justify-content:space-between; align-items:center; gap:10px; }
.grid3{ display:grid; grid-template-columns: repeat(3, 1fr); gap:8px; }
.checks{ display:flex; flex-direction:column; gap:8px; }
.check{ display:flex; gap:10px; align-items:center; font-size:13px; color:#dbe7ff; user-select:none; }
.check input{ accent-color: var(--accent); }
.point-item{ display:flex; align-items:center; justify-content:space-between; gap:10px; }
.point-text{ flex:1; overflow:hidden; text-overflow:ellipsis; }
.point-del{ border:1px solid rgba(255,92,122,0.4); background:rgba(255,92,122,0.08); color:#ffb3c1; padding:2px 8px; border-radius:999px; cursor:pointer; }
.point-del:hover{ border-color:rgba(255,92,122,0.65); background:rgba(255,92,122,0.12); }
.muted{ margin-top:8px; color:var(--muted); font-size:12px; }
.tips{ margin:0; padding-left:18px; color:var(--muted); font-size:12.5px; line-height:1.35; }
.footer{ display:flex; justify-content:space-between; align-items:center; padding:10px 14px; border-top:1px solid var(--border); color:var(--muted); font-size:12px; }
.status{ color:#cbd5e1; }
.footer-right{ color:var(--muted); }
.drop-hint{ position:absolute; inset:0; display:flex; flex-direction:column; align-items:center; justify-content:center; color:var(--muted); pointer-events:none; }
.drop-title{ font-size:18px; font-weight:700; color:#dbe7ff; margin-bottom:4px; }
.drop-sub{ font-size:13px; }
.hud{ position:absolute; left:10px; top:10px; display:flex; flex-direction:column; gap:6px; background:rgba(10,14,20,0.55); border:1px solid rgba(255,255,255,0.08); border-radius:12px; padding:8px 10px; backdrop-filter: blur(6px); }
.hud-row{ display:flex; gap:8px; align-items:center; font-size:12px; color:#dbe7ff; }
.dot{ width:10px; height:10px; border-radius:999px; background:#4b5563; display:inline-block; box-shadow:0 0 0 2px rgba(255,255,255,0.06) inset; }
.sm-status{ display:flex; align-items:center; gap:8px; color:#dbe7ff; font-size:12px; white-space:nowrap; }
.slider-label{ display:block; font-size:12px; color:var(--muted); margin-bottom:6px; }
.slider{ width:100%; }

@media (max-width: 980px){
  .layout{ grid-template-columns: 1fr; grid-template-rows: 1fr auto; }
  .viewport{ border-right:none; border-bottom:1px solid var(--border); height:55vh; }
}