:root{--bg: #f5f7fb;--card: #ffffff;--accent: #1a73e8;--muted: #6b7280;--success: #10b981;--danger: #ef4444;--ink: #111827;--border: rgba(17, 24, 39, .1);--surface-strong: linear-gradient(145deg, #0f172a, #1e3a8a 60%, #38bdf8);--accent-warm: #f97316}*{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}.debug-commands{margin-top:20px}.debug-cmd-group{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}.debug-btn{font-family:Inter,sans-serif;font-size:13px;font-weight:600;padding:8px 16px;border-radius:6px;border:1px solid rgba(16,24,40,.12);background:var(--bg);color:var(--ink);cursor:pointer;transition:background .15s,opacity .15s}.debug-btn:hover{background:#e8eaf0}.debug-btn.btn-success{background:var(--success);color:#fff;border-color:transparent}.debug-btn.btn-success:hover{background:#0ea172}.debug-btn.btn-danger{background:var(--danger);color:#fff;border-color:transparent}.debug-btn.btn-danger:hover{background:#dc2626}.home-options{display:flex;flex-direction:column;gap:12px;margin-top:24px}.home-option{display:flex;align-items:center;gap:16px;padding:20px;border:1.5px solid var(--border);border-radius:12px;text-decoration:none;color:inherit;transition:border-color .15s,box-shadow .15s}.home-option:hover{border-color:var(--accent);box-shadow:0 2px 8px #1a73e81f}.home-option-icon{font-size:32px;flex-shrink:0}.home-option-body{flex:1}.home-option-title{font-weight:600;font-size:15px;margin-bottom:2px}.home-option-desc{font-size:13px;color:var(--muted)}.home-option-arrow{font-size:22px;color:var(--muted);line-height:1}.faq-card{padding-top:24px}.faq-title{margin:0 0 12px;font-size:17px}.faq-item{border-top:1px solid var(--border)}.faq-item summary{padding:14px 24px 14px 0;color:var(--ink);font-size:14px;font-weight:600;line-height:1.5;cursor:pointer}.faq-item summary:focus-visible{outline:2px solid var(--accent);outline-offset:3px}.faq-item p,.faq-item li{margin:-4px 0 16px;color:var(--muted);font-size:13px;line-height:1.6}.faq-item ul{margin:0;padding-left:20px}.faq-item li{margin:0 0 12px;padding-left:2px}.faq-item a{color:var(--accent)}.landing-shell{max-width:980px}.landing-card{overflow:hidden;padding:0}.landing-hero{background:var(--surface-strong);color:#fff;padding:36px 32px 28px;position:relative}.landing-hero:after{content:"";position:absolute;inset:auto -60px -70px auto;width:220px;height:220px;background:radial-gradient(circle,#ffffff38,#fff0);pointer-events:none}.landing-brand{display:flex;align-items:center;gap:14px;margin-bottom:26px}.landing-brand .logo{background:linear-gradient(135deg,#facc15,#fb7185);box-shadow:0 10px 24px #0f172a40}.landing-brand h1{color:#fff;font-size:28px}.landing-brand .subtitle{color:#ffffffb8}.landing-lang .lang-btn{background:#ffffff14;border-color:#ffffff38;color:#ffffffc7}.landing-lang .lang-btn:hover{background:#ffffff24;color:#fff}.landing-lang .lang-btn.active{background:#fff;border-color:#fff;color:#0f172a}.landing-kicker{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;background:#ffffff1f;color:#ffffffe6;font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.landing-hero h2{margin:18px 0 14px;font-size:34px;line-height:1.08;max-width:12ch}.landing-lead{margin:0;max-width:55ch;font-size:16px;line-height:1.65;color:#ffffffd1}.landing-content{padding:28px 32px 32px}.landing-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.landing-panel{border:1px solid var(--border);border-radius:18px;padding:22px;background:linear-gradient(180deg,#f8fafcf2,#fff)}.landing-panel-accent{position:relative;background:linear-gradient(180deg,#fff7edf5,#fff 65%);border-color:#f973162e}.landing-panel-accent:before{content:"";position:absolute;inset:0 auto 0 0;width:4px;border-radius:18px 0 0 18px;background:linear-gradient(180deg,var(--accent-warm),#facc15)}.landing-panel h3{margin:0 0 10px;font-size:18px}.landing-panel p{margin:0 0 16px;font-size:14px;line-height:1.6;color:#334155}.landing-list{margin:0;padding-left:18px;color:#334155;display:grid;gap:10px}.landing-list li{line-height:1.55}.landing-note{margin-top:16px;padding:14px 16px;border-radius:12px;background:#eff6ff;color:#1d4ed8;font-size:13px;line-height:1.55}.landing-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:18px}.landing-link{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:12px 18px;border-radius:12px;text-decoration:none;font-weight:700;transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}.landing-link-primary{background:#111827;color:#fff;box-shadow:0 12px 20px #11182724}.landing-link-secondary{border:1px solid var(--border);color:var(--ink);background:#fff}.landing-link:hover{transform:translateY(-1px)}.landing-link-primary:hover{box-shadow:0 16px 28px #11182733}.landing-link-secondary:hover{border-color:var(--accent)}.landing-pillars{margin-top:18px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.landing-pillar{padding:14px;border-radius:14px;background:#f8fafc;border:1px solid rgba(148,163,184,.18)}.landing-pillar strong{display:block;margin-bottom:4px;font-size:13px}.landing-pillar span{font-size:12px;color:#475569;line-height:1.45}.setup-success{margin-top:16px;padding:18px;border-radius:14px;background:linear-gradient(180deg,#10b98114,#10b98108);border:1px solid rgba(16,185,129,.24)}.setup-success-icon{font-size:28px;margin-bottom:8px}.setup-success h3{margin:0 0 8px;font-size:18px;color:#047857}.setup-success p{margin:0;font-size:14px;line-height:1.6;color:#065f46}.form-field{margin-bottom:16px;text-align:left}.form-label{display:block;font-weight:600;font-size:13px;margin-bottom:6px;color:var(--ink)}.form-field input{width:100%;padding:10px 12px;border:1px solid #d1d5db;border-radius:8px;font-size:14px;font-family:inherit;color:var(--ink);background:#fff;box-sizing:border-box;transition:border-color .15s}.form-field input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #1a73e81a}.ssid-row{display:flex;gap:8px;align-items:center}.ssid-select{flex:1;padding:10px 12px;border:1px solid #d1d5db;border-radius:8px;font-size:14px;font-family:inherit;color:var(--ink);background:#fff;min-width:0}.ssid-select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #1a73e81a}.icon-btn{flex-shrink:0;width:38px;height:38px;border:1px solid #d1d5db;border-radius:8px;background:#fff;font-size:18px;cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--ink);transition:background .15s}.icon-btn:hover{background:#f3f4f6}.icon-btn:disabled{opacity:.4;cursor:default}.flash-modal-overlay{position:fixed;inset:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.flash-modal-card{background:var(--card);border-radius:12px;padding:32px;max-width:400px;width:90%;text-align:center;box-shadow:0 8px 32px #0003}.flash-modal-icon{font-size:48px;margin-bottom:12px}.flash-modal-card h2{margin:0 0 8px}.flash-modal-card p{color:var(--muted);font-size:14px;margin:0 0 24px}.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}}@media(max-width:860px){.landing-grid,.landing-pillars{grid-template-columns:1fr}}@media(max-width:520px){.landing-hero,.landing-content{padding:22px 18px}.landing-brand{align-items:flex-start;flex-wrap:wrap}.landing-brand h1{font-size:23px}.landing-hero h2{font-size:28px}.landing-actions{flex-direction:column}.landing-link{width:100%}}