:root{--primary:#009ac7;--primary-button:#007fa3;--primary-dark:#006787;--primary-light:#eff9fe;--text:#212121;--secondary-text:#727272;--divider:rgba(0,0,0,.12);--surface:#fff;--background:#fafafa;--success:#43a047;--error:#db4437}*{box-sizing:border-box}html{font-family:Roboto,Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text);background:var(--background)}body{margin:0;min-height:100dvh;display:grid;place-items:center;padding:24px;overflow-x:hidden}#particles{position:fixed;inset:0;width:100%;height:100%;z-index:0;pointer-events:none}.card{position:relative;z-index:1;width:min(100%,520px);background:rgba(255,255,255,.96);border:1px solid var(--divider);border-radius:24px;padding:28px;box-shadow:0 8px 30px rgba(0,0,0,.12);backdrop-filter:blur(4px)}header{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:26px}.eyebrow{margin:0 0 5px;color:var(--primary-dark);font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:.08em}h1{font-size:28px;line-height:1.2;font-weight:500;margin:0}.status{font-size:12px;font-weight:600;padding:7px 11px;border-radius:999px;white-space:nowrap}.disconnected{background:#ffdedc;color:#8a132c}.connected{background:#e3f9e3;color:#036730}button,input{font:inherit}button{border:0;border-radius:14px;padding:14px 20px;font-weight:500;font-size:15px;cursor:pointer;min-height:50px;transition:background-color .15s ease,box-shadow .15s ease,transform .05s ease}button:active:not(:disabled){transform:translateY(1px)}button:disabled{opacity:.45;cursor:not-allowed}.primary{background:var(--primary-button);color:#fff;box-shadow:0 2px 6px rgba(0,127,163,.25)}.primary:hover:not(:disabled){background:var(--primary-dark)}.secondary{background:var(--primary-light);color:var(--primary-dark)}.secondary:hover:not(:disabled){background:#dff3fc}.wide{width:100%}section{margin-top:26px;border-top:1px solid var(--divider);padding-top:26px}label{display:block;font-size:14px;font-weight:500;margin-bottom:10px}.serial-fields{display:grid;grid-template-columns:repeat(6,1fr);gap:8px}.serial-byte{width:100%;min-width:0;height:56px;border:1px solid rgba(0,0,0,.24);border-radius:12px;padding:0;text-align:center;background:#fff;color:var(--text);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:20px;text-transform:uppercase;letter-spacing:.04em;transition:border-color .15s ease,box-shadow .15s ease}.serial-byte:hover{border-color:rgba(0,0,0,.5)}.serial-byte:focus{outline:0;border-color:var(--primary);box-shadow:0 0 0 2px rgba(0,154,199,.18)}.hint{color:var(--secondary-text);font-size:12px;margin:8px 0 20px}.actions{display:grid;grid-template-columns:1fr 1fr;gap:12px}.message{min-height:22px;margin:18px 0 0;font-size:14px}.message.error{color:var(--error)}.message.success{color:var(--success)}@media(max-width:450px){#particles{display:none}body{padding:16px}.card{padding:20px;border-radius:20px}header{display:block}.status{display:inline-block;margin-top:14px}.serial-fields{gap:5px}.serial-byte{height:50px;font-size:17px}.actions{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){button{transition:none}#particles{display:none}}