*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--bg:#f8f9fb;--white:#fff;--text:#1e293b;--text-secondary:#64748b;--border:#e2e8f0;--accent:#6366f1;--accent-light:#eef2ff;--green:#10b981;--green-light:#ecfdf5;--red:#ef4444;--red-light:#fef2f2;--purple:#8b5cf6;--blue:#3b82f6;--blue-light:#eff6ff;--yellow:#f59e0b;--yellow-light:#fffbeb;--orange:#f97316;--shadow:0 1px 3px #0000000f;--radius:16px;--radius-sm:10px;--radius-xs:8px;--mono:"JetBrains Mono",monospace}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;-webkit-user-select:none;user-select:none;min-height:100vh;font-family:Inter,-apple-system,sans-serif}.container{max-width:1100px;margin:0 auto;padding:0 24px 48px}header{padding:20px 0}header a{color:var(--text-secondary);font-size:.95rem;font-weight:600;text-decoration:none}header a:hover{color:var(--accent)}.page-hero{text-align:center;padding:12px 0 16px}.page-hero h1{letter-spacing:-.02em;margin-bottom:4px;font-size:1.6rem;font-weight:800}.page-hero p{color:var(--text-secondary);max-width:560px;margin:0 auto;font-size:.92rem}.spec-note{color:var(--text-secondary);background:var(--white);border:1px solid var(--border);border-radius:20px;margin-top:8px;padding:3px 12px;font-size:.72rem;display:inline-block}.btn{border:1.5px solid var(--border);border-radius:var(--radius-xs);background:var(--white);color:var(--text);cursor:pointer;box-shadow:var(--shadow);align-items:center;gap:5px;padding:7px 14px;font-family:inherit;font-size:.78rem;font-weight:600;transition:all .15s;display:inline-flex}.btn:hover{border-color:var(--green);color:var(--green);transform:translateY(-1px)}.btn.active,.btn.primary{background:var(--green);border-color:var(--green);color:#fff}.btn.primary:hover{background:#059669}.btn.sm{padding:5px 10px;font-size:.72rem}.form-select{background:var(--bg);border:1.5px solid var(--border);border-radius:var(--radius-xs);color:var(--text);appearance:none;cursor:pointer;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' fill='%2364748b' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");background-position:right 8px center;background-repeat:no-repeat;padding:6px 26px 6px 10px;font-size:.8rem;font-weight:600}.main-grid{border:2px solid var(--border);border-radius:var(--radius);background:var(--white);grid-template-columns:90px 1fr;gap:0;display:grid;overflow:hidden}.sidebar{background:var(--bg);border-right:1px solid var(--border);flex-direction:column;gap:4px;padding:8px;display:flex;overflow-y:auto}.device-btn{border-radius:var(--radius-xs);background:var(--white);cursor:pointer;color:var(--text-secondary);text-align:center;border:1.5px solid #0000;flex-direction:column;align-items:center;gap:2px;padding:8px 6px;font-size:.68rem;font-weight:600;transition:all .15s;display:flex}.device-btn:hover{border-color:var(--green);color:var(--green)}.device-btn.selected{border-color:var(--green);background:var(--green-light);color:var(--green)}.device-btn .emoji{font-size:1.3rem;line-height:1}.sidebar .sep{background:var(--border);height:1px;margin:4px 0}.sidebar-label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.06em;text-align:center;padding:4px 0 2px;font-size:.6rem;font-weight:700}.mode-btn{border-radius:var(--radius-xs);background:var(--white);cursor:pointer;color:var(--text-secondary);text-align:center;border:1.5px solid #0000;justify-content:center;align-items:center;gap:4px;padding:8px 6px;font-size:.72rem;font-weight:600;transition:all .15s;display:flex}.mode-btn:hover{border-color:var(--green);color:var(--green)}.mode-btn.active{border-color:var(--green);background:var(--green);color:#fff}.canvas-area{min-height:480px;position:relative}#netCanvas{cursor:crosshair;width:100%;height:100%;display:block}.mode-banner{text-align:center;pointer-events:none;padding:6px 12px;font-size:.78rem;font-weight:600;position:relative}.mode-banner.ethernet{color:var(--green);background:#10b9811f}.mode-banner.wifi{color:#0ea5e9;background:#0ea5e91f}.mode-banner.delete{color:var(--red);background:#ef44441f}.mode-banner.place{color:var(--green);background:#10b98114}.controls-bar{border-top:1px solid var(--border);background:var(--bg);flex-wrap:wrap;align-items:center;gap:6px;padding:10px 12px;display:flex}.controls-bar .group{align-items:center;gap:4px;display:flex}.controls-bar .sep{background:var(--border);width:1px;height:24px;margin:0 4px}.info-bar{border-top:1px solid var(--border);background:var(--white);flex-wrap:wrap;gap:12px;padding:8px 12px;font-size:.78rem;display:flex}.info-bar .stat{align-items:center;gap:3px;display:flex}.info-bar .stat .label{color:var(--text-secondary)}.info-bar .stat .val{font-weight:700;font-family:var(--mono)}.log-panel{border-top:1px solid var(--border);background:var(--bg);max-height:180px;color:var(--text-secondary);padding:10px 14px;font-family:Inter,sans-serif;font-size:.8rem;line-height:1.7;overflow-y:auto}.log-panel .pkt-counter{background:var(--bg);color:var(--green);padding-bottom:4px;font-weight:700;position:sticky;top:0}.topo-ref{color:var(--text-secondary);border-top:1px solid var(--border);flex-wrap:wrap;gap:6px;padding:8px 12px;font-size:.72rem;display:flex}.topo-ref strong{color:var(--text)}.ctx-menu{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-xs);z-index:10;min-width:160px;padding:4px;position:absolute;box-shadow:0 4px 12px #0000001f}.ctx-menu .item{cursor:pointer;border-radius:4px;align-items:center;gap:6px;padding:6px 12px;font-size:.82rem;display:flex}.ctx-menu .item:hover{background:var(--bg)}.ctx-menu .item.danger{color:var(--red)}.canvas-area.mode-place,.canvas-area.mode-ethernet{border-left:3px solid var(--green)}.canvas-area.mode-wifi{border-left:3px solid #0ea5e9}.canvas-area.mode-delete{border-left:3px solid var(--red)}.onboarding{z-index:3;text-align:center;pointer-events:none;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.onboarding .cta{background:var(--green);color:#fff;border-radius:var(--radius);pointer-events:auto;cursor:pointer;border:none;padding:12px 24px;font-family:inherit;font-size:1rem;font-weight:700;animation:2s infinite pulse;box-shadow:0 4px 20px #10b9814d}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}.onboarding .hint{color:var(--text-secondary);margin-top:8px;font-size:.82rem}