:root{--bg:#f4f4f4;--card-bg:#fff;--subcard-bg:#fafafa;--border:#e0e0e0;--accent:#1976d2;--accent-soft:#e3f2fd;--danger:#c62828;--ok:#2e7d32;--text-main:#222;--text-muted:#666}*{box-sizing:border-box}body{background:var(--bg);color:var(--text-main);margin:0;padding:16px;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}.app{background:var(--card-bg);border-radius:10px;max-width:1400px;margin:0 auto;padding:20px 24px 28px;box-shadow:0 2px 12px #00000014}h1{letter-spacing:.02em;margin:0 0 4px;font-size:1.4rem}.subtitle{color:var(--text-muted);margin-bottom:16px;font-size:.85rem}.grid{grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);align-items:flex-start;gap:20px;display:grid}.card{background:var(--subcard-bg);border:1px solid var(--border);border-radius:8px;margin-top:16px;padding:14px 14px 16px}.card h2{margin:0 0 10px;font-size:1rem}.card h3{color:var(--text-main);margin:10px 0 6px;font-size:.9rem;font-weight:600}.input-group{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 12px;margin-bottom:4px;display:grid}.input-block{font-size:.8rem}.input-block label{justify-content:space-between;align-items:baseline;margin-bottom:2px;display:flex}.input-label{font-weight:500}.input-hint{color:var(--text-muted);font-size:.7rem}input,select{border:1px solid var(--border);background:#fff;border-radius:4px;width:100%;padding:6px 8px;font-family:inherit;font-size:.85rem}input:focus,select:focus{outline:1px solid var(--accent);border-color:var(--accent)}.input-readonly{color:#888;background:#f5f5f5}.input-readonly:focus{border-color:var(--border);outline:none}.button-row{flex-wrap:wrap;gap:10px;margin-top:10px;display:flex}button{cursor:pointer;border:none;border-radius:4px;align-items:center;gap:6px;padding:7px 14px;font-size:.85rem;font-weight:500;display:inline-flex}button.primary{background:var(--accent);color:#fff}button.primary:hover{background:#135ca2}button.secondary{color:#000;background:#eee}button.secondary:hover{background:#e0e0e0}canvas{background:#fff;border:1px solid #ccc;width:100%;max-height:600px;display:block}.result{margin-top:8px;font-size:.8rem;line-height:1.4}.ok{color:var(--ok);font-weight:600}.bad{color:var(--danger);font-weight:600}.small{color:var(--text-muted);font-size:.78rem}.legend{color:var(--text-muted);flex-wrap:wrap;align-items:center;gap:8px 14px;margin:6px 0 0;font-size:.75rem;display:flex}.legend-item{align-items:center;gap:4px;display:inline-flex}.legend-swatch{border:1px solid #999;border-radius:2px;width:14px;height:10px}.swatch-full{background:#e0e0e0}.swatch-start{background:#fff59d}.swatch-gap{background:#f5f5f5}.swatch-bad{background:#ef9a9a}.vertex-row{grid-template-columns:auto 1fr 1fr;align-items:center;gap:6px;margin-bottom:4px;font-size:.8rem;display:grid}.vertex-row span{white-space:nowrap;font-size:.8rem}.section-heading{text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin:4px 0 6px;font-size:.8rem;font-weight:600}@media (max-width:980px){.grid{grid-template-columns:1fr}}