:root{
  --bg:#0a0a0f;--surf:#111118;--surf2:#1a1a24;--surf3:#22222e;
  --brd:rgba(255,255,255,.08);--brd2:rgba(255,255,255,.14);
  --txt:#e8e8f0;--txt2:#8888a8;--txt3:#55556a;
  --blue:#3b82f6;--cyan:#06b6d4;--green:#10b981;--red:#ef4444;
  --orange:#f97316;--purple:#a855f7;--yellow:#eab308;
  --nfc:#06b6d4;--ble:#a855f7;
  --r:14px;--r2:10px;--r3:8px;
  --sh:0 4px 24px rgba(0,0,0,.4);
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
body{background:var(--bg);color:var(--txt);font-family:-apple-system,BlinkMacSystemFont,'SF Pro Display','Segoe UI',sans-serif;min-height:100vh;font-size:15px;overflow-x:hidden}
/* ─── TOP BAR ─── */
.topbar{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(10,10,15,.85);backdrop-filter:blur(20px);border-bottom:1px solid var(--brd);padding:0 16px;height:56px;display:flex;align-items:center;gap:12px}
.topbar-title{font-size:17px;font-weight:700;letter-spacing:-.4px;flex:1}
.topbar-sub{font-size:11px;color:var(--txt2)}
.lang-pill{background:var(--surf2);border:1px solid var(--brd);border-radius:20px;padding:4px 10px;font-size:12px;font-weight:600;cursor:pointer;color:var(--txt2)}
/* ─── TABS ─── */
.tabs{position:fixed;top:56px;left:0;right:0;z-index:99;background:rgba(10,10,15,.92);backdrop-filter:blur(16px);border-bottom:1px solid var(--brd);display:flex;overflow-x:auto;scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.tab{flex-shrink:0;padding:10px 14px;font-size:12px;font-weight:600;color:var(--txt3);cursor:pointer;border-bottom:2px solid transparent;white-space:nowrap;transition:.2s}
.tab.active{color:var(--blue);border-bottom-color:var(--blue)}
/* ─── CONTENT ─── */
.content{padding:112px 16px 100px;max-width:480px;margin:0 auto}
.page{display:none}.page.active{display:block}
/* ─── CARDS ─── */
.card{background:var(--surf);border:1px solid var(--brd);border-radius:var(--r);padding:16px;margin-bottom:12px}
.card-title{font-size:13px;font-weight:700;color:var(--txt2);text-transform:uppercase;letter-spacing:.8px;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.card-title .dot{width:6px;height:6px;border-radius:50%;background:var(--blue)}
/* ─── FORM ROWS ─── */
.row{display:flex;align-items:center;justify-content:space-between;padding:8px 0;border-bottom:1px solid var(--brd)}
.row:last-child{border-bottom:none}
.row-label{font-size:13px;color:var(--txt2);flex:1}
.row-value{font-size:13px;font-weight:600;color:var(--txt)}
input[type=range]{-webkit-appearance:none;width:120px;height:3px;background:var(--surf3);border-radius:2px;outline:none}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;border-radius:50%;background:var(--blue);cursor:pointer}
input[type=number],input[type=text]{background:var(--surf2);border:1px solid var(--brd);border-radius:6px;color:var(--txt);font-size:13px;padding:4px 8px;width:100px;outline:none;text-align:right}
select{background:var(--surf2);border:1px solid var(--brd);border-radius:6px;color:var(--txt);font-size:13px;padding:4px 8px;outline:none;cursor:pointer;max-width:160px}
.toggle{width:44px;height:26px;background:var(--surf3);border-radius:13px;position:relative;cursor:pointer;transition:.3s;flex-shrink:0}
.toggle.on{background:var(--green)}
.toggle::after{content:'';position:absolute;top:3px;left:3px;width:20px;height:20px;border-radius:50%;background:#fff;transition:.3s;box-shadow:0 1px 4px rgba(0,0,0,.3)}
.toggle.on::after{left:21px}
/* ─── SLIDER WITH VALUE ─── */
.slider-row{display:flex;align-items:center;gap:10px}
.slider-row input[type=range]{flex:1;width:auto}
.slider-val{font-size:13px;font-weight:700;color:var(--txt);min-width:60px;text-align:right}
/* ─── BUTTONS ─── */
.btn{display:flex;align-items:center;justify-content:center;gap:8px;padding:13px 20px;border-radius:var(--r2);font-size:14px;font-weight:700;cursor:pointer;border:none;transition:.2s;letter-spacing:-.2px;width:100%}
.btn-blue{background:var(--blue);color:#fff}
.btn-blue:active{background:#2563eb}
.btn-green{background:var(--green);color:#fff}
.btn-green:active{background:#059669}
.btn-red{background:var(--red);color:#fff}
.btn-red:active{background:#dc2626}
.btn-outline{background:transparent;color:var(--txt);border:1px solid var(--brd2)}
.btn-outline:active{background:var(--surf2)}
.btn-cyan{background:var(--nfc);color:#fff}
.btn-cyan:active{background:#0891b2}
.btn-purple{background:var(--ble);color:#fff}
.btn-purple:active{background:#9333ea}
.btn-sm{padding:8px 14px;font-size:12px;border-radius:var(--r3);width:auto}
.btn-row{display:flex;gap:8px;margin-bottom:12px}
.btn-row .btn{flex:1}
/* ─── BADGE ─── */
.badge{display:inline-flex;align-items:center;padding:2px 8px;border-radius:20px;font-size:10px;font-weight:700;letter-spacing:.4px}
.badge-nfc{background:rgba(6,182,212,.15);color:var(--nfc);border:1px solid rgba(6,182,212,.3)}
.badge-ble{background:rgba(168,85,247,.15);color:var(--ble);border:1px solid rgba(168,85,247,.3)}
.badge-ok{background:rgba(16,185,129,.15);color:var(--green)}
.badge-err{background:rgba(239,68,68,.15);color:var(--red)}
/* ─── STATUS BAR ─── */
.status-bar{background:var(--surf2);border:1px solid var(--brd);border-radius:var(--r2);padding:10px 14px;font-size:12px;display:flex;align-items:center;gap:8px;margin-bottom:12px}
.status-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}
.status-dot.idle{background:var(--txt3)}
.status-dot.active{background:var(--green);animation:pulse 1.5s infinite}
.status-dot.error{background:var(--red)}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
/* ─── DRIVER LIST ─── */
.driver-item{background:var(--surf2);border:1px solid var(--brd);border-radius:var(--r2);padding:12px 14px;margin-bottom:8px;cursor:pointer;transition:.2s;position:relative}
.driver-item:active,.driver-item.selected{border-color:var(--blue);background:rgba(59,130,246,.06)}
.driver-item-header{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.driver-icon{width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0}
.driver-icon.nfc{background:rgba(6,182,212,.15)}
.driver-icon.ble{background:rgba(168,85,247,.15)}
.driver-name{font-size:14px;font-weight:700}
.driver-brand{font-size:11px;color:var(--txt2)}
.driver-params{display:grid;grid-template-columns:repeat(3,1fr);gap:6px}
.driver-param{background:var(--surf3);border-radius:6px;padding:6px 8px;text-align:center}
.driver-param-val{font-size:13px;font-weight:700;color:var(--txt)}
.driver-param-key{font-size:10px;color:var(--txt3);margin-top:1px}
.driver-actions{display:flex;gap:6px;margin-top:10px}
/* ─── CODE FRAME ─── */
.code-frame{background:#0d1117;border:1px solid var(--brd);border-radius:var(--r2);padding:12px;font-family:'SF Mono',Menlo,Monaco,monospace;font-size:12px;color:#7ee787;word-break:break-all;line-height:1.6;overflow-x:auto}
.frame-struct{margin-top:12px}
.frame-byte{display:inline-flex;flex-direction:column;align-items:center;margin:3px;background:var(--surf2);border:1px solid var(--brd);border-radius:6px;padding:4px 6px;min-width:42px}
.frame-byte-val{font-family:monospace;font-size:12px;font-weight:700;color:var(--blue)}
.frame-byte-key{font-size:9px;color:var(--txt3);margin-top:2px;text-align:center}
/* ─── LANG MODAL ─── */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.7);z-index:200;display:none;align-items:flex-end}
.modal-overlay.open{display:flex}
.modal{background:var(--surf);border-radius:20px 20px 0 0;padding:20px;width:100%;max-height:70vh;overflow-y:auto}
.modal-handle{width:40px;height:4px;background:var(--brd2);border-radius:2px;margin:0 auto 16px}
.lang-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.lang-item{padding:8px;border-radius:8px;text-align:center;cursor:pointer;border:1px solid var(--brd);font-size:12px;transition:.2s}
.lang-item.active{border-color:var(--blue);background:rgba(59,130,246,.1);color:var(--blue)}
/* ─── SCAN ANIMATION ─── */
.scan-ring{width:120px;height:120px;margin:20px auto;position:relative}
.scan-ring::before,.scan-ring::after{content:'';position:absolute;border-radius:50%;border:2px solid}
.scan-ring::before{inset:0;border-color:rgba(6,182,212,.2);animation:ring-outer 2s ease-out infinite}
.scan-ring::after{inset:20px;border-color:rgba(6,182,212,.4);animation:ring-outer 2s .5s ease-out infinite}
.scan-icon{position:absolute;inset:40px;background:rgba(6,182,212,.1);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:22px}
@keyframes ring-outer{0%{transform:scale(.8);opacity:.8}100%{transform:scale(1.3);opacity:0}}
.ble-ring::before{border-color:rgba(168,85,247,.2)}
.ble-ring::after{border-color:rgba(168,85,247,.4)}
.ble-ring .scan-icon{background:rgba(168,85,247,.1)}
/* ─── HCL ─── */
.hcl-icons{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.hcl-icon{padding:8px 12px;border-radius:8px;border:1px solid var(--brd);font-size:12px;display:flex;align-items:center;gap:6px;cursor:pointer;transition:.2s}
.hcl-icon.active{border-color:var(--yellow);background:rgba(234,179,8,.1);color:var(--yellow)}
/* ─── BOTTOM NAV ─── */
.bottom-nav{position:fixed;bottom:0;left:0;right:0;background:rgba(10,10,15,.95);backdrop-filter:blur(20px);border-top:1px solid var(--brd);display:flex;padding:8px 0 env(safe-area-inset-bottom)}
.nav-item{flex:1;display:flex;flex-direction:column;align-items:center;gap:3px;padding:4px 0;cursor:pointer;color:var(--txt3);transition:.2s;font-size:9px;font-weight:600}
.nav-item.active{color:var(--blue)}
.nav-item svg{width:22px;height:22px}
/* ─── RGB PRESET ─── */
.rgb-preset{padding:5px 10px;border-radius:20px;font-size:11px;font-weight:700;cursor:pointer;color:#fff;transition:.15s;border:1px solid rgba(255,255,255,.2)}
.rgb-preset:active{transform:scale(.95)}

/* ─── STEPPER ─── */
.stepper{display:flex;align-items:center;gap:0;border:1px solid var(--brd2);border-radius:10px;overflow:hidden;background:var(--surf2)}
.stepper-btn{width:38px;height:38px;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:300;cursor:pointer;color:var(--txt2);border:none;background:transparent;flex-shrink:0;transition:.15s;-webkit-tap-highlight-color:transparent;user-select:none}
.stepper-btn:active{background:var(--surf3);color:var(--txt)}
.stepper-val{min-width:52px;text-align:center;font-size:16px;font-weight:700;color:var(--txt);border:none;background:transparent;outline:none;padding:0 2px}
.stepper-unit{font-size:12px;color:var(--txt3);padding-right:10px}
.temp-row{display:flex;flex-direction:column;padding:10px 0;border-bottom:1px solid var(--brd);gap:8px}
.temp-row:last-of-type{border-bottom:none}
.temp-label{font-size:13px;color:var(--txt2);display:flex;align-items:center;gap:8px}
.temp-badge{font-size:10px;font-weight:700;padding:2px 7px;border-radius:20px;letter-spacing:.3px}

/* ─── TOAST ─── */
#toast{position:fixed;top:70px;left:50%;transform:translateX(-50%);z-index:999;padding:10px 20px;border-radius:20px;font-size:13px;font-weight:600;pointer-events:none;opacity:0;transition:.3s;white-space:nowrap}
#toast.show{opacity:1}
#toast.ok{background:rgba(16,185,129,.9);color:#fff}
#toast.err{background:rgba(239,68,68,.9);color:#fff}
#toast.info{background:rgba(59,130,246,.9);color:#fff}


/* ════════════════════════════════════════════════════════════
   FEEDBACK GRID — Responsive 2x2
   ════════════════════════════════════════════════════════════ */
.feedback-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  width: 100%;
}

.feedback-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  border-radius: 10px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  min-width: 0;
  transition: all 0.2s;
  cursor: pointer;
}

.feedback-item:hover {
  background: rgba(255,255,255,0.08);
  border-color: var(--cyan);
}

.feedback-item input[type="checkbox"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
  accent-color: var(--cyan);
  flex-shrink: 0;
}

.feedback-item .icon {
  font-size: 20px;
  flex-shrink: 0;
}

.feedback-item label {
  font-size: 13px;
  cursor: pointer;
  word-break: break-word;
  flex: 1;
  line-height: 1.3;
}

.feedback-item .subtitle {
  font-size: 10px;
  color: var(--txt3);
  display: block;
  margin-top: 2px;
}

@media (max-width: 400px) {
  .feedback-grid {
    grid-template-columns: 1fr;
  }
}