:root{--bg: #f5f7fb;--card: #ffffff;--accent: #1a73e8;--muted: #6b7280;--success: #10b981;--danger: #ef4444;--ink: #111827}*{box-sizing:border-box}body{margin:0;font-family:Inter,Segoe UI,system-ui,-apple-system,Helvetica Neue,Arial,sans-serif;background:var(--bg);color:var(--ink);min-height:100vh;display:flex;align-items:flex-start;justify-content:center;padding:32px 16px 64px}.wrap{width:100%;max-width:520px;display:flex;flex-direction:column;gap:16px}.card{background:var(--card);border-radius:12px;box-shadow:0 6px 20px #11182714;padding:28px;border:1px solid rgba(16,24,40,.04)}.brand{display:flex;align-items:center;gap:12px;margin-bottom:24px}.logo{width:44px;height:44px;background:linear-gradient(135deg,var(--accent),#6aa0ff);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0}.brand h1{margin:0;font-size:18px;font-weight:700;color:var(--ink)}.brand .subtitle{margin:2px 0 0;font-size:13px;color:var(--muted)}.lang-switcher{display:flex;gap:4px;margin-left:auto;flex-shrink:0}.lang-btn{padding:4px 10px;border-radius:6px;border:1px solid #d1d5db;background:#f9fafb;color:var(--muted);font-size:12px;font-weight:600;cursor:pointer;transition:all .15s}.lang-btn:hover{background:#f3f4f6;color:var(--ink)}.lang-btn.active{background:var(--accent);border-color:var(--accent);color:#fff}.steps{display:flex;align-items:flex-start;justify-content:space-between;position:relative;margin-bottom:28px}.steps:before{content:"";position:absolute;top:16px;left:10%;right:10%;height:2px;background:#e5e7eb;z-index:0}.step{display:flex;flex-direction:column;align-items:center;gap:6px;flex:1;position:relative;z-index:1}.step-circle{width:32px;height:32px;border-radius:50%;background:#e5e7eb;color:var(--muted);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;transition:background .3s,color .3s}.step.active .step-circle{background:var(--accent);color:#fff}.step.completed .step-circle{background:var(--success);color:#fff}.step-label{font-size:11px;color:var(--muted);text-align:center;line-height:1.3}.step.active .step-label{color:var(--accent);font-weight:600}.step.completed .step-label{color:var(--success)}.step-content{display:none}.step-content.active{display:block;animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.step-content h2{margin:0 0 16px;font-size:17px;font-weight:700;color:var(--ink)}.instruction-list{padding:0 0 0 22px;margin:0 0 20px;display:flex;flex-direction:column;gap:10px}.instruction-list li{font-size:14px;line-height:1.5;color:#374151}.step-icon{text-align:center;font-size:64px;margin:16px 0}.success-icon{text-align:center;font-size:48px;margin:12px 0 8px}.step-desc{font-size:14px;color:var(--muted);line-height:1.6;margin:0 0 16px}.info-box{background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;padding:12px;margin:0 0 16px}.info-box-title{font-weight:600;color:#1e40af;margin-bottom:4px;font-size:13px}.info-box-text{font-size:12px;color:#1e40af;line-height:1.5}.actions{display:flex;gap:10px;margin-top:20px}button.primary{flex:1;padding:12px;border-radius:8px;border:none;font-weight:600;cursor:pointer;font-size:15px;background:var(--accent);color:#fff;transition:background .2s}button.primary:hover:not(:disabled){background:#1557b0}button.secondary{flex:1;padding:12px;border-radius:8px;border:none;font-weight:600;cursor:pointer;font-size:15px;background:#e5e7eb;color:#374151;transition:background .2s}button.secondary:hover:not(:disabled){background:#d1d5db}button:disabled{opacity:.5;cursor:not-allowed}.btn-icon{background:none;border:none;cursor:pointer;font-size:16px;padding:4px 6px;border-radius:4px;line-height:1}.btn-icon:hover{background:#f3f4f6}.btn-small{padding:9px 16px;border-radius:8px;border:none;background:var(--accent);color:#fff;font-weight:600;font-size:14px;cursor:pointer;white-space:nowrap;transition:background .2s}.btn-small:hover{background:#1557b0}.error-text{color:var(--danger);font-size:13px;margin:10px 0 0;text-align:center}.spinner-wrap{display:flex;flex-direction:column;align-items:center;padding:28px 0 12px;gap:16px}.spinner{width:40px;height:40px;border:3px solid #e5e7eb;border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.waiting-text{font-size:14px;color:var(--muted);margin:0}.device-id-card{background:#f9fafb;border:1px solid #e5e7eb;border-radius:8px;padding:14px 16px;margin:16px 0;text-align:center}.device-id-label{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:4px}.device-id-value{font-family:Consolas,Courier New,monospace;font-size:18px;font-weight:700;color:var(--ink)}.terminal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}.terminal-header h2{margin:0;font-size:15px;font-weight:700}.terminal{min-height:200px;max-height:40vh;overflow:auto;border-radius:8px;background:#0b1110;color:#9ef2ce;font:.87rem/1.4 Consolas,Courier New,monospace;padding:12px;margin:0;white-space:pre-wrap;word-break:break-all}.log-info{color:#60a5fa}.log-error{color:#f87171}.log-cmd{color:#fbbf24}.log-serial{color:#9ef2ce}.send-row{display:flex;gap:8px;margin-top:10px}.send-row input{flex:1;border:1.5px solid #d1d5db;border-radius:8px;padding:9px 12px;font:14px Inter,system-ui,sans-serif;outline:none;transition:border-color .15s}.send-row input:focus{border-color:var(--accent)}.debug-active-hero{text-align:center;padding:16px 0 8px}.debug-active-icon{font-size:48px;margin-bottom:12px}.debug-active-hero h2{color:var(--success);margin:0 0 8px}.unsupported{text-align:center;padding:40px 20px}.unsupported-icon{font-size:48px;margin-bottom:16px}@media(max-width:520px){body{padding:16px 12px 48px}.card{padding:18px}.step-label{font-size:10px}}