:root{--app-bg:#fff;--app-surface:#f5f5f6;--app-border:#e5e5e7;--app-overlay:#f0f0f1;--app-text-strong:#111114;--app-text-muted:#6b7280;--app-text-faint:#9ca3af;--app-accent:#111114;--app-accent-text:#fff;--app-success:#16a34a;--app-success-bg:#dcfce7;--app-danger:#dc2626;--app-danger-bg:#fee2e2;--app-font:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif}*,:before,:after{box-sizing:border-box;margin:0;font-weight:400}ul{padding:0;list-style:none}button{font:inherit}body{background:var(--app-surface);min-height:100vh;color:var(--app-text-strong);font-family:var(--app-font);text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.5}.app-shell{background:var(--app-surface);justify-content:center;min-height:100vh;display:flex}.app-card{background:var(--app-bg);width:100%;max-width:390px;min-height:100vh;box-shadow:0 0 0 1px var(--app-border);flex-direction:column;display:flex}.topbar{justify-content:space-between;align-items:center;padding:20px 24px 0;display:flex}.back-link{color:var(--app-text-strong);cursor:pointer;background:0 0;border:none;align-items:center;gap:6px;padding:0;font-size:15px;display:flex}.step-pill{background:var(--app-overlay);letter-spacing:.5px;color:var(--app-text-muted);text-transform:uppercase;border-radius:999px;padding:4px 10px;font-size:11px;font-weight:700}.screen-title{letter-spacing:-.3px;margin:16px 24px 0;font-size:24px;font-weight:800}.divider{background:var(--app-border);height:1px;margin-top:20px}.screen-body{flex-direction:column;flex:1;gap:20px;padding:24px;display:flex}.intro-text{color:var(--app-text-strong);font-size:15px}.step-list{color:var(--app-text-muted);flex-direction:column;gap:6px;padding-left:18px;font-size:14px;display:flex}.step-list li{list-style:decimal}.status-banner{background:var(--app-overlay);color:var(--app-text-muted);border-radius:10px;align-items:center;gap:10px;padding:14px 16px;font-size:14px;display:flex}.status-banner--done{color:var(--app-text-strong)}.status-check{color:var(--app-success);font-weight:700}.section-label{letter-spacing:.6px;text-transform:uppercase;color:var(--app-text-muted);font-size:11px;font-weight:700}.device-list-empty{border:1px dashed var(--app-border);min-height:120px;color:var(--app-text-faint);border-radius:10px;justify-content:center;align-items:center;font-size:14px;display:flex}.device-card{border:1px solid var(--app-border);background:var(--app-overlay);border-radius:10px;justify-content:space-between;align-items:center;padding:14px 16px;display:flex}.device-card__left{align-items:center;gap:12px;display:flex}.device-radio{border:2px solid var(--app-text-strong);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:18px;height:18px;display:flex}.device-radio:after{content:"";background:var(--app-text-strong);border-radius:50%;width:9px;height:9px}.device-name{font-size:15px;font-weight:600}.signal-bars{align-items:flex-end;gap:2px;height:14px;display:flex}.signal-bars span{background:var(--app-border);border-radius:1px;width:3px}.signal-bars span.signal-bars__on{background:var(--app-text-strong)}.field{flex-direction:column;gap:6px;display:flex}.field label{color:var(--app-text-strong);font-size:13px;font-weight:600}.field input{border:1px solid var(--app-border);background:var(--app-bg);color:var(--app-text-strong);border-radius:8px;padding:12px 14px;font-size:15px}.field input:focus{outline:2px solid var(--app-text-strong);outline-offset:1px}.field-password{position:relative}.field-password button{cursor:pointer;color:var(--app-text-muted);background:0 0;border:none;font-size:13px;position:absolute;top:34px;right:10px}.field-error{color:var(--app-danger);font-size:13px}.btn-primary{background:var(--app-accent);color:var(--app-accent-text);letter-spacing:.6px;text-transform:uppercase;cursor:pointer;text-align:center;border:none;border-radius:10px;padding:14px;font-size:13px;font-weight:800}.btn-primary:disabled{opacity:.5;cursor:default}.btn-link{color:var(--app-text-strong);cursor:pointer;text-align:center;background:0 0;border:none;padding:0;font-size:13px;font-weight:700;text-decoration:underline}.spinner{border:3px solid var(--app-border);border-top-color:var(--app-text-strong);border-radius:50%;width:48px;height:48px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.spinner-row{align-items:center;gap:12px;display:flex}.result-screen{text-align:center;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:20px;padding:24px;display:flex}.result-icon{border-radius:50%;justify-content:center;align-items:center;width:72px;height:72px;font-size:32px;display:flex}.result-icon--success{background:var(--app-success-bg);color:var(--app-success);border:2px solid var(--app-success)}.result-icon--error{background:var(--app-danger-bg);color:var(--app-danger);border:2px solid var(--app-danger)}.result-title{font-size:20px;font-weight:800}.result-desc{color:var(--app-text-muted);max-width:280px;font-size:14px}.info-card,.tips-card{background:var(--app-overlay);text-align:left;border-radius:10px;width:100%;padding:16px}.info-card{flex-direction:column;gap:10px;display:flex}.info-row{justify-content:space-between;align-items:center;padding-top:10px;font-size:13px;display:flex}.info-row:first-child{padding-top:0}.info-row+.info-row{border-top:1px solid var(--app-border)}.info-label{color:var(--app-text-muted);text-transform:uppercase;letter-spacing:.5px;font-size:11px;font-weight:700}.info-value{font-weight:700}.tips-title{letter-spacing:.5px;text-transform:uppercase;color:var(--app-text-muted);margin-bottom:10px;font-size:11px;font-weight:700}.tips-list{flex-direction:column;gap:8px;font-size:14px;display:flex}.tips-list li{margin-left:18px;list-style:outside}.result-actions{flex-direction:column;align-items:center;gap:16px;width:100%;display:flex}.result-actions button{text-transform:uppercase;width:100%}.dashboard-header{padding:24px 24px 0;font-size:22px;font-weight:800}.tower-list{flex-direction:column;gap:14px;padding:20px 24px 24px;display:flex}.tower-card{border:1px solid var(--app-border);background:var(--app-overlay);border-radius:12px;flex-direction:column;gap:12px;padding:16px;display:flex}.tower-card__top{justify-content:space-between;align-items:center;gap:12px;display:flex}.tower-card__name{font-size:15px;font-weight:700}.tower-card__status{color:var(--app-text-muted);font-size:13px}.tower-card__status--live{color:var(--app-success);font-weight:700}.tower-card__guardian{color:var(--app-text-muted);font-size:13px}.tower-card__hint{color:var(--app-text-faint);font-size:12px}.pair-new-card{border:1px dashed var(--app-border);color:var(--app-text-muted);cursor:pointer;background:0 0;border-radius:12px;justify-content:center;align-items:center;gap:8px;width:calc(100% - 48px);margin:0 24px;padding:18px;font-size:14px;font-weight:700;display:flex}