:root{--bg:#f3f5f4;--panel:#fff;--ink:#17201c;--muted:#66736d;--line:#dde3e0;--brand:#155a3c;--brand2:#1f7a52;--accent:#e2a72e;--err:#c8443a;--warn:#c98a12;--ok:#1d8a55;--stage:#1d2328;--radius:10px;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC","Segoe UI",sans-serif;font-size:14px;color:var(--ink);background:var(--bg)}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{margin:0;height:100%}
body{display:flex;flex-direction:column;min-height:100vh}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer;border:1px solid var(--line);background:#fff;border-radius:8px;padding:7px 12px}
button:hover{border-color:#b6c3bd}
button.primary{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:600}
button.primary:hover{background:var(--brand2)}
button.ghost{background:transparent}
button.small{padding:4px 9px;font-size:12px}
button.link{border:0;background:none;color:var(--brand2);padding:0;text-decoration:underline}
button.wide{width:100%}
button:disabled{opacity:.6;cursor:wait}
input,select,textarea{border:1px solid var(--line);border-radius:8px;padding:7px 9px;background:#fff;width:100%}
input:focus,select:focus,textarea:focus{outline:2px solid #9fd2b8;border-color:#6fb592}
input[type=checkbox]{width:auto;margin:0 4px 0 0;vertical-align:-2px}
input[type=range]{padding:0;border:0}

/* top bar */
.topbar{display:flex;align-items:center;gap:20px;padding:0 18px;height:58px;background:#0f2a1f;color:#e9f2ed;flex-shrink:0}
.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;font-weight:700;font-size:16px;white-space:nowrap}
.logo{width:26px;height:26px;border-radius:7px;background:radial-gradient(circle at 30% 30%,#f0c64a 0 3px,transparent 4px),radial-gradient(circle at 70% 30%,#f0c64a 0 3px,transparent 4px),radial-gradient(circle at 30% 70%,#f0c64a 0 3px,transparent 4px),radial-gradient(circle at 70% 70%,#f0c64a 0 3px,transparent 4px),#1f7a52}
.steps{display:flex;gap:4px;flex:1;justify-content:center}
.steps button{background:transparent;border:0;color:#9db5a9;display:flex;align-items:center;gap:7px;padding:8px 10px;border-radius:8px}
.steps button i{font-style:normal;width:22px;height:22px;border-radius:50%;display:grid;place-items:center;border:1.5px solid #4c6b5d;font-size:12px}
.steps button.on{color:#fff;background:#1c4635}
.steps button.on i{background:var(--accent);border-color:var(--accent);color:#1b1b1b;font-weight:700}
.steps button.done i{background:#2e7d5a;border-color:#2e7d5a;color:#fff}
.contact{font-size:12px;color:#a9c2b6;white-space:nowrap}

/* layout */
.layout{flex:1;display:grid;grid-template-columns:400px 1fr;min-height:0}
.panel{background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0;overflow:auto}
.step{display:none;padding:20px 20px 8px}
.step.on{display:block}
.step h1{font-size:20px;margin:0 0 6px}
.step h2{font-size:13px;margin:20px 0 8px;color:#33423b;letter-spacing:.02em}
.lead{color:var(--muted);margin:0 0 14px;line-height:1.6}
.hint{color:var(--muted);font-size:12px;line-height:1.6;margin:6px 0}
.nav{position:sticky;bottom:0;margin-top:auto;display:flex;justify-content:space-between;gap:10px;padding:12px 20px;border-top:1px solid var(--line);background:#fbfcfb}
.nav button{min-width:110px}
.field{display:block;margin:10px 0;font-size:12px;color:#44524b}
.field>input,.field>select,.field>textarea{margin-top:4px}
.field span{display:flex;align-items:center;gap:6px}
.pair{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:8px 0}
.rowbtns{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.rowbtns button{flex:1}
.rowbtns button.on,.tools button.on{background:#e7f3ec;border-color:#6fb592;color:var(--brand)}
.drop{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;border:2px dashed #9fc3b0;border-radius:12px;padding:30px 12px;background:#f5faf7;cursor:pointer;text-align:center;transition:.15s}
.drop:hover,.drop.over{background:#e7f3ec;border-color:var(--brand2)}
.drop b{font-size:15px;color:var(--brand)}
.drop span{color:var(--muted);font-size:12px}
.filebtn{display:inline-block;border:1px solid var(--line);border-radius:8px;padding:7px 12px;cursor:pointer;background:#fff}
.files{list-style:none;padding:0;margin:8px 0}
.files li{display:flex;justify-content:space-between;align-items:center;padding:6px 8px;border:1px solid var(--line);border-radius:8px;margin:4px 0;font-size:12px}
.files small{color:var(--muted)}
.x{border:0;background:none;color:#99a39e;font-size:16px;padding:0 6px;line-height:1}
.x:hover{color:var(--err)}
.demo{font-size:12px;color:var(--muted);margin-top:20px}
.status{padding:9px 11px;border-radius:8px;background:#f2f4f3;font-size:13px;margin:10px 0}
.status.busy{background:#fff7e3;color:#7a5b10}
.status.ok{background:#e8f5ee;color:#18603f}
.status.err{background:#fdecea;color:#9b2c22;white-space:pre-wrap}
.card{border:1px solid var(--line);border-radius:var(--radius);padding:12px 14px;margin:12px 0;background:#fff}
.card.ok{border-color:#b8dcc8}
.card.big{padding:18px}
.card.big h2{color:var(--ok);font-size:17px;margin:0 0 8px}
.cardhead{display:flex;justify-content:space-between;align-items:baseline;gap:8px;margin-bottom:8px}
.cardhead b{font-size:15px}
.cardhead span{color:var(--muted);font-size:12px}
.kv{display:grid;gap:5px;margin:8px 0}
.kv>div{display:flex;justify-content:space-between;gap:10px;font-size:13px;border-bottom:1px dashed #edf0ee;padding-bottom:4px}
.kv span{color:var(--muted);white-space:nowrap}
.kv b{font-weight:600;text-align:right}
.chips{display:flex;flex-wrap:wrap;gap:5px;margin:8px 0}
.chip{font-size:11px;padding:2px 7px;border-radius:20px;background:#eef4f1;color:#2c5a45}
.chip.warn{background:#fff3d9;color:#8a5c00}
details summary{cursor:pointer;color:var(--brand2);font-size:12px;margin:6px 0}
.seg{display:flex;border:1px solid var(--line);border-radius:9px;overflow:hidden;background:#fff}
.seg button{flex:1;border:0;border-radius:0;padding:9px 8px;display:flex;flex-direction:column;align-items:center;gap:2px;background:#fff}
.seg button+button{border-left:1px solid var(--line)}
.seg button small{font-size:11px;color:var(--muted)}
.seg button.on{background:var(--brand);color:#fff}
.seg button.on small{color:#cfe5d9}
.seg.small button{padding:5px 12px;flex-direction:row;font-size:13px;white-space:nowrap;flex:none}
.more{margin-top:10px}

/* probes */
.probes{display:grid;gap:6px}
.probe{display:flex;gap:10px;align-items:flex-start;text-align:left;padding:8px 10px}
.probe i{flex:0 0 14px;height:14px;border-radius:50%;margin-top:3px;box-shadow:0 0 0 2px #fff,0 0 0 3px #cfd8d3}
.probe div{display:flex;flex-direction:column;gap:2px;min-width:0}
.probe b{font-size:13px}
.probe b em{font-style:normal;background:#eef4f1;border-radius:10px;padding:0 6px;font-size:11px;margin-left:4px;color:var(--brand)}
.probe span{font-size:12px;color:#4a5852}
.probe small{font-size:11px;color:var(--muted)}
.probe.on{border-color:var(--brand2);background:#eef7f2;box-shadow:inset 0 0 0 1px var(--brand2)}
.tools{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin:12px 0 6px}
.tools button{padding:7px 4px;font-size:12px}
.checks p{margin:4px 0;font-size:12px;line-height:1.5;padding:5px 8px;border-radius:6px}
.checks .err{background:#fdecea;color:#9b2c22}
.checks .warn{background:#fff6e0;color:#7a5600}
.listhead{display:flex;justify-content:space-between;align-items:center;margin:14px 0 6px;font-size:13px;gap:8px;flex-wrap:wrap}
.dot{display:inline-flex;align-items:center;gap:4px;font-size:11px;color:#3e4b45}
.dot::before{content:"";width:9px;height:9px;border-radius:50%;background:var(--c)}
i.dot{width:10px;height:10px;border-radius:50%;background:var(--c);display:inline-block}
i.dot::before{display:none}
.plist{max-height:340px;overflow:auto;border:1px solid var(--line);border-radius:8px}
.prow{display:grid;grid-template-columns:1fr 78px 24px;gap:6px;align-items:center;padding:5px 8px;border-bottom:1px solid #eef1ef}
.prow:last-child{border-bottom:0}
.prow .pn{display:flex;flex-direction:column;min-width:0}
.prow .pn b{font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.prow .pn small{font-size:11px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.prow select{padding:3px 5px;font-size:12px}
.prow.bad{background:#fdecea}
.prow.warn{background:#fff8e6}
.prow .mini{font-size:11px;display:flex;align-items:center;gap:3px}
.prow .mini input{width:58px;padding:3px 5px}
#keepoutBox .prow{grid-template-columns:1fr 90px 24px;border:1px solid var(--line);border-radius:8px;margin:4px 0}

/* materials */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:8px}
.mat{display:flex;flex-direction:column;align-items:flex-start;gap:4px;text-align:left;padding:10px}
.mat b{font-size:13px}
.mat span{font-size:11px;color:var(--muted);line-height:1.45}
.mat.on{border-color:var(--brand2);background:#eef7f2;box-shadow:inset 0 0 0 1px var(--brand2)}
.sw{width:100%;height:28px;border-radius:6px;display:block}
.sw.bakelite{background:linear-gradient(135deg,#a4532a,#c06a3c 60%,#8d4421)}
.sw.acrylic{background:linear-gradient(135deg,#e6f6fb,#b9dde8 55%,#f4fbfd);border:1px solid #cfe3ea}
.sw.pcb{background:repeating-linear-gradient(0deg,#d7c66b 0 5px,#c5b45a 5px 6px)}
.toggles{display:flex;flex-direction:column;gap:6px;margin:10px 0;font-size:13px}
.form{margin-top:8px}
.price{margin:10px 0 0;font-size:14px}
.price b{color:var(--brand)}

/* stage */
.stage{display:flex;flex-direction:column;min-width:0;min-height:0;background:var(--stage)}
.stagebar{display:flex;align-items:center;gap:12px;padding:8px 12px;background:#161b1f;color:#cfd8d3;flex-wrap:wrap}
.stagebar .seg{background:#232a2f;border-color:#353e44;flex:none}
.stagebar .seg button{background:#232a2f;color:#cfd8d3}
.stagebar .seg button+button{border-color:#353e44}
.stagebar .seg button.on{background:#2f7a55;color:#fff}
.vhint{font-size:12px;color:#8fa29a;flex:1;min-width:120px}
.layers{display:flex;gap:10px;align-items:center;font-size:12px;flex-wrap:wrap}
.layers button{background:transparent;color:#cfd8d3;border-color:#3d474d}
.viewport{position:relative;flex:1;min-height:420px;overflow:hidden}
.v2d{position:absolute;inset:0;width:100%;height:100%;touch-action:none;background:radial-gradient(circle at 50% 40%,#2a3238,#1a1f23)}
.v3d{position:absolute;inset:0;background:radial-gradient(ellipse at 50% 35%,#f4f6f7 0%,#d9dfe2 55%,#b7c0c5 100%)}
.v3d canvas{display:block;width:100%;height:100%}
.v3dmsg{position:absolute;left:16px;top:12px;color:#7a2a20;font-size:13px}
.empty{position:absolute;inset:0;display:grid;place-items:center;color:#8fa29a;pointer-events:none}
.empty div{display:flex;flex-direction:column;align-items:center;gap:6px}
.empty b{font-size:16px;color:#cfd8d3}
.coord{position:absolute;right:10px;bottom:8px;font:11px ui-monospace,Menlo,monospace;color:#9fb0a8;pointer-events:none}
.v2-tip{position:absolute;pointer-events:none;background:rgba(15,20,24,.92);color:#e9f0ec;font-size:12px;line-height:1.5;padding:6px 9px;border-radius:7px;max-width:280px;z-index:5;border:1px solid #3a464c}
.v2-pad{fill:rgba(120,220,255,.08);stroke:rgba(140,215,240,.55);stroke-width:1}
.v2-pad.rec{fill:rgba(120,230,255,.18);stroke:#7fe0ff;stroke-width:1.3}
.v2-pad.sel{fill:var(--c);stroke:#fff;stroke-width:1.2;fill-opacity:.85}
.v2-probe{fill:none;stroke:var(--c);stroke-width:2}
.v2-probe.warn{stroke:#ffbf2f;stroke-dasharray:3 2}
.v2-probe.bad{stroke:#ff4b3a;stroke-width:3}
.v2-probe.hi{stroke-width:4}
.v2-tipdot{fill:var(--c);stroke:#fff;stroke-width:.05}
.v2-label{font:600 11px -apple-system,"PingFang SC","Microsoft YaHei",sans-serif;paint-order:stroke;stroke:#11161a;stroke-width:3px;pointer-events:none}
.v2-hwlabel{font:600 10px sans-serif;fill:#4a2a10;pointer-events:none}
.v2-cap{fill:none;stroke:#5a3b1d;stroke-dasharray:6 4;stroke-width:1.2}
.v2-hw{stroke-width:1.4}
.v2-hw.spring{fill:#e8e8e8;stroke:#555}
.v2-hw.bearing{fill:#cfd5d9;stroke:#444}
.v2-hw.shaft{fill:#8d979e;stroke:#333}
.v2-hw.base{fill:#f6f6f6;stroke:#666}
.v2-keepout{fill:rgba(255,90,70,.25);stroke:#ff6a55;stroke-width:1.5;stroke-dasharray:4 3}
.v2-band{fill:rgba(127,224,255,.12);stroke:#7fe0ff;stroke-dasharray:4 3}
.v2-band.keepout{fill:rgba(255,90,70,.15);stroke:#ff6a55}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:#17201c;color:#fff;padding:10px 16px;border-radius:9px;box-shadow:0 6px 24px rgba(0,0,0,.25);z-index:50;max-width:90vw;font-size:13px}
.toast.err{background:#9b2c22}

@media (max-width:980px){
  .topbar{height:auto;flex-wrap:wrap;padding:8px 12px;gap:8px}
  .topbar .brand{margin-right:auto}
  .steps{order:3;flex:0 0 100%;width:100%;min-width:0;overflow-x:auto;justify-content:flex-start;scrollbar-width:none}
  .steps::-webkit-scrollbar{display:none}
  .steps button{flex:none;padding:6px 8px}
  .steps button span{display:none}
  .steps button.on span{display:inline}
  .contact{display:none}
  .layout{grid-template-columns:1fr;grid-template-rows:auto auto}
  .stage{order:-1;height:56vh}
  .viewport{min-height:0}
  .panel{border-right:0}
}

.secure{font-size:12px;color:var(--muted);margin:8px 0 0;line-height:1.5}
.secure a,.agree a{color:var(--brand2)}
.acct{color:#e7f1ec;text-decoration:none;font-size:13px;border:1px solid #3a5a4b;border-radius:8px;padding:6px 10px;margin-left:10px;white-space:nowrap}
.acct:hover{background:#1c4635}
.verify .pair{display:grid;grid-template-columns:auto 1fr auto;gap:8px;margin:-4px 0 6px}
.verify .ok{color:var(--ok)}
.agree{display:block;font-size:13px;margin:10px 0 12px;line-height:1.6}
.brand .wordmark{height:30px;width:auto;display:block}
.brand .tag{font-size:13px;font-weight:500;color:#b9cdc3;padding-left:10px;border-left:1px solid #2f5646}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
@media (max-width:700px){.brand .tag{display:none}}
.langsw{margin-left:10px;background:transparent;border:1px solid #2f5646;color:#d9e6df;border-radius:8px;padding:5px 10px;font-size:13px;cursor:pointer}
.langsw:hover{border-color:#3FBF7F;color:#fff}
.lang-en .zh-only,.lang-zh .en-only{display:none!important}
@media (max-width:400px){
  .topbar{gap:6px;padding:8px 10px}
  .topbar .wordmark{height:20px}
  .acct{font-size:12px;padding:5px 8px;margin-left:0}
  .langsw{margin-left:4px;padding:4px 8px;font-size:12px}
  .steps{gap:0}
  .steps button{padding:6px 5px}
}