*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0f1117;--surface:#181b23;--card:#1e2230;--border:#2a2e3d;
  --text:#e4e6ed;--muted:#8b8fa3;--accent:#4f8cff;--accent2:#6ba0ff;
  --success:#34d399;--danger:#f87171;--radius:10px;
}
html{font-size:15px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Noto Sans SC",sans-serif;background:var(--bg);color:var(--text);min-height:100vh;display:flex;flex-direction:column}
header{text-align:center;padding:2rem 1rem .5rem}
.logo{font-size:1.8rem;font-weight:700;letter-spacing:.04em}
.subtitle{color:var(--muted);font-size:.85rem;margin-top:.2rem}
main{flex:1;max-width:640px;width:100%;margin:0 auto;padding:0 1rem 3rem}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:1.4rem;margin-top:1.2rem}
h2{font-size:1.15rem;font-weight:600;margin-bottom:1rem}
.form-group{margin-bottom:1rem}
.form-group label{display:block;margin-bottom:.3rem;font-size:.82rem;color:var(--muted)}
select,input[type=text]{width:100%;padding:.6rem .8rem;font-size:.95rem;background:var(--surface);border:1px solid var(--border);color:var(--text);border-radius:var(--radius);outline:none;transition:.2s}
select:focus,input:focus{border-color:var(--accent)}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:.65rem 1.4rem;border:none;border-radius:var(--radius);font-size:.92rem;font-weight:600;cursor:pointer;transition:.15s;width:100%}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn.primary{background:var(--accent);color:#fff}
.btn.primary:hover:not(:disabled){background:var(--accent2)}
.btn.secondary{background:var(--surface);color:var(--text);border:1px solid var(--border)}
.btn-row{display:flex;gap:.75rem;margin-top:.5rem}
.btn-row .btn{width:auto;flex:1}
.instructions{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:.8rem 1rem;margin-bottom:1rem;font-size:.85rem;color:var(--muted)}
.instructions p{margin-bottom:.4rem}
.instructions ol{padding-left:1.2rem}
.instructions li{margin-bottom:.3rem}
.instructions strong{color:var(--text)}
.device-grid{display:grid;grid-template-columns:1fr 1fr;gap:.6rem;margin-bottom:1rem}
.device-grid>div{background:var(--surface);border-radius:8px;padding:.6rem .8rem}
.device-grid .label{display:block;font-size:.72rem;color:var(--muted);margin-bottom:.2rem}
.device-grid .value{font-size:.92rem;font-weight:500}
.device-grid>div:last-child{grid-column:1/-1}
.progress-box{margin:1rem 0}
.progress-bar{height:10px;border-radius:5px;background:var(--surface);overflow:hidden}
.progress-fill{height:100%;width:0%;border-radius:5px;background:linear-gradient(90deg,var(--accent),var(--success));transition:width .3s}
.progress-text{text-align:right;font-size:.78rem;color:var(--muted);margin-top:.25rem}
.status-text{font-size:.88rem;color:var(--accent);margin-bottom:.5rem;min-height:1.2em}
.log{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:.8rem;font-size:.75rem;color:var(--muted);max-height:200px;overflow-y:auto;white-space:pre-wrap;word-break:break-all;font-family:"Cascadia Code",Consolas,monospace;margin-top:.5rem}
.done-banner{background:rgba(52,211,153,.08);border-color:var(--success)}
.done-banner h2{color:var(--success)}
.done-banner p{color:var(--muted);margin-bottom:1rem}
footer{text-align:center;padding:1.5rem;font-size:.75rem;color:var(--muted)}
.tabs{display:flex;gap:0;margin-bottom:1rem;border-bottom:2px solid var(--border)}
.tab{background:none;border:none;color:var(--muted);padding:.5rem 1rem;font-size:.88rem;cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-2px;font-weight:500}
.tab.active{color:var(--accent);border-bottom-color:var(--accent)}
.tab-content{display:none}
.tab-content.active{display:block}
@media(max-width:480px){main{padding:0 .6rem 2rem}.btn-row{flex-direction:column}}