:root{
  --bg:#f4f7f5;--panel:#fff;--text:#17231d;--muted:#65736b;--line:#d7e0da;
  --accent:#1f6f50;--accent2:#dff1e8;--danger:#8b2c2c;--shadow:0 8px 30px rgba(25,55,40,.08)
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif}
button,input,select{font:inherit}
button{cursor:pointer}
.topbar{position:sticky;top:0;z-index:20;display:flex;gap:16px;align-items:center;justify-content:space-between;padding:14px max(16px,env(safe-area-inset-left));background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
h1{font-size:1.25rem;margin:0}.subtitle{font-size:.8rem;color:var(--muted);margin-top:3px}
.app{width:min(1180px,100%);margin:0 auto;padding:16px}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:16px;box-shadow:var(--shadow);margin-bottom:14px}
.panel.compact{padding:12px 16px}
.panel h2{font-size:1rem;margin:0 0 10px}
.grid{display:grid;gap:12px}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.grid.four{grid-template-columns:repeat(4,minmax(0,1fr))}
.field,.upload{display:flex;flex-direction:column;gap:6px;min-width:0}.field span,.upload span{font-size:.82rem;font-weight:700;color:var(--muted)}
input,select{width:100%;min-height:44px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--text);padding:9px 11px;font-size:16px}
.unit{display:flex;align-items:center;gap:7px}.unit b{font-size:.82rem;white-space:nowrap;color:var(--muted)}
.actions{display:flex;flex-wrap:wrap;align-items:flex-end;gap:8px}
.btn,.tool{min-height:44px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--text);padding:9px 12px;font-weight:700}
.btn.primary,.tool.highlight{background:var(--accent);border-color:var(--accent);color:#fff}
.tool.active{background:var(--accent2);border-color:var(--accent);color:#174f3a}
.tool.danger{color:var(--danger)}
.tools{display:flex;gap:8px;overflow-x:auto;padding:2px 0 12px;scrollbar-width:thin}
.tool{flex:0 0 auto}
.status{margin-bottom:12px;padding:11px 13px;border:1px solid var(--line);border-radius:13px;background:#fff;color:var(--muted);font-size:.9rem}
.canvasWrap{background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:var(--shadow)}
canvas{display:block;width:100%;height:auto;max-height:72vh;object-fit:contain;touch-action:manipulation;background:#e9eeeb}
.metrics{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:9px;margin:12px 0 14px}
.metrics article{background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px;min-width:0}
.metrics small{display:block;color:var(--muted);font-size:.72rem;margin-bottom:3px}.metrics strong{font-size:.96rem;word-break:break-word}
.note{font-size:.82rem;line-height:1.5;color:var(--muted);margin:12px 0 0}
#materials{font-size:.92rem;line-height:1.8}
@media(max-width:800px){
  .grid.four{grid-template-columns:repeat(2,minmax(0,1fr))}
  .metrics{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:560px){
  .app{padding:10px}.topbar{padding:10px 12px}.subtitle{display:none}
  .grid.two,.grid.four{grid-template-columns:1fr}
  .metrics{grid-template-columns:repeat(2,minmax(0,1fr))}
  .panel{padding:12px;border-radius:15px}
  .btn,.tool{min-height:46px}
}