*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{color:#f0f6fc;background:#0d1117;min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.login-screen{justify-content:center;align-items:center;min-height:100vh;padding:16px;display:flex}.login-card{text-align:center;background:#161b22;border:1px solid #30363d;border-radius:12px;width:100%;max-width:360px;padding:40px 36px}.brand-icon{margin-bottom:10px;font-size:2.8rem;line-height:1}.brand-title{margin-bottom:28px;font-size:1.4rem;font-weight:600}.login-card input{color:#f0f6fc;background:#0d1117;border:1px solid #30363d;border-radius:6px;width:100%;margin-bottom:10px;padding:10px 12px;font-size:14px;transition:border-color .15s}.login-card input:focus{border-color:#388bfd;outline:none}.login-card input::placeholder{color:#6e7681}.btn-primary{color:#fff;cursor:pointer;background:#238636;border:1px solid #2ea043;border-radius:6px;width:100%;margin-top:4px;padding:10px;font-size:14px;font-weight:500;transition:background .15s}.btn-primary:hover:not(:disabled){background:#2ea043}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.error-msg{color:#f85149;min-height:18px;margin-top:12px;font-size:13px}.header{z-index:10;background:#161b22;border-bottom:1px solid #30363d;justify-content:space-between;align-items:center;padding:14px 24px;display:flex;position:sticky;top:0}.header-left{align-items:center;gap:10px;font-size:1.05rem;font-weight:600;display:flex}.header-right{align-items:center;gap:14px;display:flex}.user-email{color:#8b949e;text-overflow:ellipsis;white-space:nowrap;max-width:200px;font-size:13px;overflow:hidden}.btn-ghost{color:#8b949e;cursor:pointer;background:0 0;border:1px solid #30363d;border-radius:6px;padding:6px 12px;font-size:13px;transition:border-color .15s,color .15s}.btn-ghost:hover{color:#f0f6fc;border-color:#6e7681}.dot{border-radius:50%;flex-shrink:0;width:10px;height:10px;display:inline-block}.main{max-width:900px;margin:0 auto;padding:28px 20px}.section-title{color:#8b949e;letter-spacing:.08em;text-transform:uppercase;margin-bottom:16px;font-size:12px;font-weight:600}.devices-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;display:grid}.device-card{background:#161b22;border:1px solid #30363d;border-radius:10px;padding:20px}.device-name{margin-bottom:4px;font-size:1rem;font-weight:600}.device-id-label{color:#6e7681;margin-bottom:16px;font-family:SF Mono,Fira Code,monospace;font-size:11px}.channel-row{border-top:1px solid #21262d;justify-content:space-between;align-items:center;padding:10px 0;display:flex}.channel-label{color:#c9d1d9;font-size:14px}.toggle-btn{cursor:pointer;letter-spacing:.05em;border:none;border-radius:20px;min-width:64px;padding:6px 14px;font-size:12px;font-weight:600;transition:background .15s,transform .1s}.toggle-btn:active{transform:scale(.96)}.toggle-btn.on{color:#fff;background:#238636}.toggle-btn.off{color:#6e7681;background:#21262d}.empty-state{color:#6e7681;text-align:center;padding:48px 0;font-size:14px}.empty-icon{margin-bottom:10px;font-size:2rem}