:root{
  --bg:#F3F4F6;--card:#FFFFFF;--text:#1f2937;--muted:#6b7280;--border:#E5E7EB;
  --accent:#059669;--accent-text:#fff;--shadow:0 4px 16px rgba(0,0,0,.06);
}
[data-theme=dark]{
  --bg:#0f172a;--card:#1e293b;--text:#e2e8f0;--muted:#94a3b8;--border:#334155;
  --accent:#10b981;--accent-text:#052e16;--shadow:0 4px 16px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
body.lk-body{margin:0;font-family:Inter,system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
.lk-top{display:flex;align-items:center;gap:12px;padding:10px 16px;background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}
.brand{display:flex;align-items:center;gap:8px;font-weight:800;text-decoration:none;color:var(--text)}
.brand-logo{width:28px;height:28px;border-radius:8px}
.lk-top-actions{margin-left:auto;display:flex;gap:8px;align-items:center}
.burger,.icon-btn{border:0;background:var(--bg);border-radius:10px;padding:8px 10px;cursor:pointer}
.lk-layout{display:flex;min-height:calc(100vh - 56px)}
.lk-side{width:72px;flex-shrink:0;position:relative;z-index:30}
.lk-side .rail-inner{width:72px;background:var(--card);border-right:1px solid var(--border);padding:8px 0;transition:width .28s cubic-bezier(.22,1,.36,1);overflow:hidden;will-change:width}
.lk-side a{display:flex;align-items:center;gap:12px;padding:12px 14px;margin:4px 8px;border-radius:12px;text-decoration:none;color:var(--text)}
.lk-side a span{width:24px;text-align:center;flex-shrink:0}
.lk-side a small{opacity:0;max-width:0;overflow:hidden;font-weight:700;font-size:13px;white-space:nowrap;transition:opacity .15s,max-width .2s}
.lk-side a.active{background:#ECFDF5;color:#065f46}
@media(min-width:1025px){
  .lk-side:hover .rail-inner,.lk-side:focus-within .rail-inner{width:200px;box-shadow:8px 0 24px rgba(0,0,0,.06)}
  .lk-side:hover a small,.lk-side:focus-within a small{opacity:1;max-width:140px}
  .burger{display:none}
}
@media(max-width:1024px){
  .lk-side{position:fixed;left:0;top:56px;bottom:0;width:0;overflow:hidden}
  .lk-side.open{width:220px}
  .lk-side.open .rail-inner{width:220px}
  .lk-side.open a small{opacity:1;max-width:140px}
  .lk-backdrop{display:none;position:fixed;inset:0;background:rgba(0,0,0,.35);z-index:25}
  .lk-backdrop.show{display:block}
}
.lk-main{flex:1;min-width:0;padding:18px;max-width:1000px;margin:0 auto;width:100%}
.lk-panel{display:none}.lk-panel.active{display:block}
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:18px;box-shadow:var(--shadow);margin-bottom:14px}
.card.compact{padding:16px}
.btn-accent{background:var(--accent);color:var(--accent-text);border:0;border-radius:12px;padding:10px 16px;font-weight:700;cursor:pointer;text-decoration:none;display:inline-block}
.secondary,a.secondary,.btn.secondary,button.secondary{background:#fff;color:var(--text);border:1px solid #D1D5DB;border-radius:12px;padding:10px 14px;font-weight:600;cursor:pointer;text-decoration:none;display:inline-block}
[data-theme=dark] .secondary{background:var(--card);border-color:var(--border)}
.btn-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px;align-items:center}
.muted{color:var(--muted)}
.badge{display:inline-block;padding:4px 10px;border-radius:999px;font-size:12px;font-weight:700}
.badge-ok{background:#D1FAE5;color:#065f46}
.badge-err{background:#FEE2E2;color:#991B1B}
.status-banner{border-radius:18px;padding:20px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-bottom:14px}
.status-banner.ok{background:linear-gradient(120deg,#ECFDF5,#D1FAE5);border:1px solid #6EE7B7;color:#065f46}
.status-banner.bad{background:linear-gradient(120deg,#FFF7ED,#FEE2E2);border:1px solid #FDBA74;color:#9A3412}
.sb-title{font-size:1.25rem;font-weight:800}
.sb-sub{opacity:.9;margin-top:4px;font-weight:600}
.progress{height:8px;background:#E5E7EB;border-radius:999px;overflow:hidden;margin:6px 0}
.progress i{display:block;height:100%;background:var(--accent)}
.home-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:14px}
@media(max-width:900px){.home-grid{grid-template-columns:1fr}}
.copy-field{display:flex;align-items:flex-start;gap:8px;background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:12px;cursor:pointer;margin-top:10px}
.copy-field code{flex:1;font-size:13px;line-height:1.4}
.btn-inline{border:0;background:var(--accent);color:#fff;border-radius:8px;padding:6px 10px;font-weight:700;cursor:pointer;flex-shrink:0}
.proto-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
@media(max-width:800px){.proto-grid{grid-template-columns:1fr}}
.proto{border:1px solid var(--border);border-radius:14px;padding:14px;background:var(--bg)}
.plan-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
@media(max-width:700px){.plan-grid{grid-template-columns:1fr}}
.plan-card{display:flex;flex-direction:column;gap:4px;padding:16px;border:2px solid var(--border);border-radius:14px;cursor:pointer}
.plan-card:has(input:checked){border-color:var(--accent)}
.plan-d{font-weight:800}.plan-p{color:var(--muted);font-weight:700}
.promo-row{display:flex;gap:8px;margin-top:12px}
.promo-row input{flex:1;padding:10px;border-radius:12px;border:1px solid var(--border)}
.info-box{background:#EFF6FF;border:1px solid #BFDBFE;color:#1E3A8A;border-radius:14px;padding:14px;margin-bottom:14px;font-weight:600}
.accordion details{border:1px solid var(--border);border-radius:12px;padding:10px 14px;margin-bottom:8px;background:var(--bg)}
.accordion summary{font-weight:800;cursor:pointer}
.steps{margin:8px 0 0 18px}.steps li{margin:8px 0;font-size:15px}
.empty-state{text-align:center;padding:20px}.empty-state.sm{padding:12px}
.empty-state .emoji{font-size:1.6rem}
.stat-pill{flex:1;text-align:center;background:var(--bg);border-radius:14px;padding:14px;border:1px solid var(--border)}
.stat{font-size:1.4rem;font-weight:800}
.diag-list{list-style:none;padding:0;margin:0}.diag-list li{margin:8px 0}
.sep{border:none;border-top:1px solid var(--border);margin:14px 0}
.toast{position:fixed;bottom:20px;right:20px;background:#111827;color:#fff;padding:12px 16px;border-radius:12px;z-index:9999;font-weight:600}
.row-between{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}
.ref-banner{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:16px;padding:12px;border-radius:12px;background:#ECFDF5;border:1px solid #A7F3D0;flex-wrap:wrap}
.switch-row{display:flex;align-items:center;gap:8px;margin-top:12px;font-weight:600;opacity:.7}
.dot{display:inline-block;width:8px;height:8px;border-radius:50%;margin-right:6px}
.dot.ok{background:#059669}

.diag-block{margin:12px 0}
.diag-block b{display:block;margin-bottom:6px}
.diag-advice{margin-top:12px;padding:12px;background:var(--bg);border-radius:12px;border:1px solid var(--border)}

.traffic-mini{margin-top:12px;max-width:320px}
.traffic-label{display:flex;justify-content:space-between;gap:8px;font-weight:700;font-size:14px;margin-bottom:6px}
.progress{height:10px;background:rgba(0,0,0,.08);border-radius:999px;overflow:hidden}
.progress i{display:block;height:100%;background:var(--accent);border-radius:999px;transition:width .4s ease}

.badge-warn{background:#FEF3C7;color:#92400E}
.progress i{transition:width .4s ease}

.global-status{background:#991B1B;color:#fff;text-align:center;padding:8px 12px;font-weight:700;font-size:13px}
.quick-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:0 0 14px}
.qa-btn{display:flex;align-items:center;justify-content:center;gap:8px;padding:16px;border-radius:16px;border:1px solid var(--border);background:var(--card);font-weight:800;text-decoration:none;color:var(--text);cursor:pointer;box-shadow:var(--shadow)}
.qa-btn.primary{background:var(--accent);color:var(--accent-text);border-color:transparent}
.donut-traffic{display:flex;align-items:center;gap:14px;margin-top:10px}
@media(max-width:600px){.quick-actions{grid-template-columns:1fr}}



/* ===== polish-v20 ===== */
:root{
  --bg:#F4F5F7;
  --card:#FFFFFF;
  --text:#111827;
  --muted:#6B7280;
  --border:#E5E7EB;
  --accent:#16A34A;
  --accent-text:#FFFFFF;
  --accent-soft:#ECFDF5;
  --shadow:0 4px 20px rgba(0,0,0,.05);
  --radius:16px;
  --side:#FFFFFF;
}
html[data-theme="dark"]{
  --bg:#0F172A;
  --card:#1E293B;
  --text:#E5E7EB;
  --muted:#9CA3AF;
  --border:rgba(255,255,255,.1);
  --accent:#10B981;
  --accent-text:#FFFFFF;
  --accent-soft:rgba(16,185,129,.15);
  --shadow:none;
  --side:#111827;
}
*{box-sizing:border-box}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:Inter,system-ui,-apple-system,sans-serif;
  line-height:1.5;
  padding-top:env(safe-area-inset-top);
  padding-bottom:env(safe-area-inset-bottom);
}
.lk-shell{max-width:1200px;margin:0 auto;padding:16px 18px 40px}
.lk-top{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:10px 4px 14px;position:sticky;top:0;z-index:30;
  background:linear-gradient(var(--bg) 70%, transparent);
}
.lk-brand{font-weight:800;display:flex;align-items:center;gap:8px}
.icon-btn,.btn-chip{
  border:1px solid var(--border);background:var(--card);color:var(--text);
  border-radius:12px;padding:8px 12px;cursor:pointer;text-decoration:none;
  font-weight:600;font-size:13px;
}
.btn-chip.tg{background:#229ED9;border-color:#229ED9;color:#fff}
.card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:24px;margin-bottom:14px;
}
.card h3{margin:0 0 10px;font-size:1.05rem;font-weight:700}
.muted{color:var(--muted)}
.btn-accent,.primary,.qa-btn.primary{
  background:var(--accent);color:var(--accent-text)!important;border:none;
  border-radius:14px;padding:12px 16px;font-weight:700;cursor:pointer;
  text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px;
  box-shadow:0 8px 20px rgba(16,163,74,.25);transition:transform .15s ease,filter .15s ease;
}
.btn-accent:hover,.qa-btn.primary:hover{filter:brightness(.95);transform:translateY(-1px)}
.secondary,.btn.secondary,a.secondary.btn,button.secondary{
  background:var(--card)!important;color:var(--text)!important;
  border:1px solid var(--border)!important;border-radius:14px;
  padding:11px 14px;font-weight:600;cursor:pointer;text-decoration:none;
  display:inline-flex;align-items:center;gap:6px;transition:background .15s ease;
}
html[data-theme="dark"] .secondary,
html[data-theme="dark"] .btn.secondary,
html[data-theme="dark"] a.secondary.btn,
html[data-theme="dark"] button.secondary{
  background:transparent!important;color:var(--text)!important;border-color:rgba(255,255,255,.22)!important;
}
.badge{display:inline-block;padding:6px 10px;border-radius:999px;font-size:12px;font-weight:700;margin:3px 4px 3px 0}
.badge-ok{background:var(--accent-soft);color:#047857}
html[data-theme="dark"] .badge-ok{color:#6EE7B7}
.badge-err{background:#FEE2E2;color:#B91C1C}
html[data-theme="dark"] .badge-err{background:rgba(239,68,68,.2);color:#FCA5A5}
.badge-warn{background:#FEF3C7;color:#92400E}
html[data-theme="dark"] .badge-warn{background:rgba(245,158,11,.2);color:#FCD34D}
.sub-banner{
  border-radius:var(--radius);padding:18px 20px;margin-bottom:14px;
  background:var(--accent-soft);border:1px solid rgba(16,163,74,.25);color:var(--text);
}
html[data-theme="dark"] .sub-banner{background:#064E3B;border-color:#047857;color:#ECFDF5}
html[data-theme="dark"] .sub-banner .muted{color:#A7F3D0}
.lk-side a{color:var(--muted);text-decoration:none;border-radius:12px;padding:10px 12px;display:flex;gap:10px;align-items:center}
.lk-side a.active{background:var(--accent-soft);color:var(--accent);font-weight:700}
.lk-side a span{filter:grayscale(.3);opacity:.85}
.lk-side a.active span{filter:none;opacity:1}
.quick-actions{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px;margin-bottom:14px}
@media(max-width:720px){.quick-actions{grid-template-columns:1fr}}
.qa-btn{
  display:flex;align-items:center;justify-content:center;gap:8px;padding:16px;
  border-radius:16px;border:1px solid var(--border);background:var(--card);color:var(--text);
  font-weight:700;text-decoration:none;cursor:pointer;box-shadow:var(--shadow);
}
.ref-bar{height:10px;background:var(--border);border-radius:999px;overflow:hidden;margin-top:8px}
.ref-bar>i{display:block;height:100%;background:var(--accent);width:0;transition:width .35s ease}
.modal-bg{position:fixed;inset:0;background:rgba(0,0,0,.55);display:none;place-items:center;z-index:100;padding:20px}
.modal-bg.open{display:grid}
.modal{background:var(--card);color:var(--text);border-radius:20px;padding:20px;max-width:360px;width:100%;border:1px solid var(--border);text-align:center}
.modal img{width:min(280px,80vw);height:auto;background:#fff;padding:12px;border-radius:12px}
.empty-illu{font-size:42px;margin:8px 0}
.toast{
  position:fixed;right:16px;top:16px;z-index:120;background:#111827;color:#fff;
  padding:12px 16px;border-radius:12px;opacity:0;transform:translateY(-8px);transition:.25s;pointer-events:none
}
html[data-theme="dark"] .toast{background:#F9FAFB;color:#111}
.toast.show{opacity:1;transform:none}
.skeleton{background:linear-gradient(90deg,var(--border),transparent,var(--border));background-size:200% 100%;animation:sk 1.2s infinite;border-radius:10px;height:14px;margin:8px 0}
@keyframes sk{0%{background-position:200% 0}100%{background-position:-200% 0}}
.global-status{background:#991B1B;color:#fff;text-align:center;padding:8px 12px;font-weight:700;font-size:13px}
.btn-row{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.copy-field{display:flex;align-items:center;gap:8px;border:1px solid var(--border);border-radius:12px;padding:10px 12px;background:var(--bg)}
.copy-field code{flex:1;overflow:auto;font-size:12px}
.btn-inline{border:0;background:transparent;cursor:pointer;font-weight:700;color:var(--accent)}

/* polish-v21 */
.lk-side a.active{border-left:3px solid var(--accent);padding-left:9px}
.lk-panel{display:none}
.lk-panel.active{display:block}
.lk-panel-anim{animation:fadeIn .25s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.lk-side a span{filter:grayscale(1);opacity:.75}
.lk-side a.active span{filter:none;opacity:1;color:var(--accent)}
button:disabled,button[disabled]{opacity:.45;cursor:not-allowed}

/* ===== polish-v22: UX fixes ===== */
.lk-greet{
  font-weight:700;font-size:14px;color:var(--text);white-space:nowrap;
  overflow:hidden;text-overflow:ellipsis;max-width:220px;margin:0 8px;
}
@media(max-width:720px){.lk-greet{display:none}}
.lk-top-actions{margin-left:auto;display:flex;gap:8px;align-items:center;flex-shrink:0}
.btn-chip.tg.icon-only{
  width:40px;height:40px;padding:0;display:inline-flex;align-items:center;justify-content:center;
  background:var(--accent)!important;border-color:var(--accent)!important;color:#fff!important;
  font-size:16px;border-radius:12px;
}
.smart-banner{
  display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;
  padding:10px 16px;background:linear-gradient(90deg,#ECFDF5,#D1FAE5);
  border-bottom:1px solid #A7F3D0;color:#065F46;font-weight:600;font-size:14px;
}
.smart-banner a{color:#047857;font-weight:800;text-decoration:underline;white-space:nowrap}
html[data-theme="dark"] .smart-banner{
  background:linear-gradient(90deg,#064E3B,#065F46);border-color:#047857;color:#ECFDF5;
}
html[data-theme="dark"] .smart-banner a{color:#6EE7B7}

/* ref banner contrast */
.ref-banner{
  display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:16px;
  padding:14px;border-radius:12px;background:#ECFDF5;border:1px solid #A7F3D0;flex-wrap:wrap;
  color:#065F46;
}
.ref-banner b{color:#065F46}
.ref-banner .ref-sub,.ref-banner .muted{color:#047857!important;opacity:.9}
html[data-theme="dark"] .ref-banner{
  background:rgba(16,185,129,.12);border-color:rgba(16,185,129,.35);color:#ECFDF5;
}
html[data-theme="dark"] .ref-banner b{color:#ECFDF5}
html[data-theme="dark"] .ref-banner .ref-sub,
html[data-theme="dark"] .ref-banner .muted{color:#A7F3D0!important}

.btn-outline-accent{
  background:transparent!important;color:#047857!important;
  border:2px solid #059669!important;border-radius:12px;
  padding:10px 14px;font-weight:700;text-decoration:none;display:inline-flex;align-items:center;
  cursor:pointer;
}
html[data-theme="dark"] .btn-outline-accent{
  color:#6EE7B7!important;border-color:#10B981!important;
}

/* copy button looks like a button */
.btn-inline{
  border:0!important;background:var(--accent)!important;color:#fff!important;
  border-radius:10px!important;padding:8px 12px!important;font-weight:700!important;
  cursor:pointer;flex-shrink:0;font-size:13px;line-height:1.2;
}
.btn-inline:active{filter:brightness(.92)}
.copy-field{align-items:center}

/* button sizes */
.btn-sm{padding:6px 10px!important;font-size:12px!important;border-radius:10px!important}
.btn-lg{padding:14px 20px!important;font-size:15px!important;width:100%;max-width:360px}
.btn-accent,.secondary,button.secondary,a.secondary,.btn-outline-accent,.qa-btn{
  min-height:42px;font-size:14px;
}

/* dark theme readability */
html[data-theme="dark"] .status-banner.ok{color:#ECFDF5}
html[data-theme="dark"] .status-banner.ok .sb-sub,
html[data-theme="dark"] .status-banner.ok .muted{color:#A7F3D0}
html[data-theme="dark"] .status-banner.bad{color:#FEF2F2}
html[data-theme="dark"] .switch-row,
html[data-theme="dark"] .switch-row .muted{color:var(--text)!important;opacity:1}
html[data-theme="dark"] .status-banner .secondary,
html[data-theme="dark"] form button.secondary{
  background:transparent!important;color:#E2E8F0!important;border:1px solid rgba(255,255,255,.35)!important;
}

/* protocols */
.proto{position:relative}
.proto.recommended{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}
.proto-head{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:6px}
.proto p{margin:0;color:var(--muted);font-size:13px}

/* devices */
.device-list{list-style:none;padding:0;margin:14px 0 0}
.device-item{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:12px 14px;border:1px solid var(--border);border-radius:14px;margin-bottom:8px;background:var(--bg);
}
.device-main{display:flex;align-items:center;gap:12px}
.device-icon{font-size:22px}
.device-name{font-weight:700}
.device-meta{font-size:12px}
.fix-box{
  background:#ECFDF5;border:1px solid #A7F3D0;border-radius:14px;padding:14px;
}
html[data-theme="dark"] .fix-box{background:rgba(16,185,129,.12);border-color:rgba(16,185,129,.35)}

/* brand header stickiness with body.lk-body */
body.lk-body .lk-top{
  background:var(--card);border-bottom:1px solid var(--border);
}
.hwid-code{font-size:11px;word-break:break-all;background:var(--bg);padding:2px 6px;border-radius:6px;border:1px solid var(--border)}

/* polish-v23 */
input, textarea, select{font-size:16px !important}
.offline-banner{display:none;position:sticky;top:56px;z-index:60;background:#991B1B;color:#fff;text-align:center;padding:10px;font-weight:700}
.offline-banner.show{display:block}
.session-modal{position:fixed;inset:0;background:rgba(0,0,0,.5);display:none;place-items:center;z-index:200;padding:20px}
.session-modal.open{display:grid}
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-thumb{background:rgba(100,116,139,.45);border-radius:8px}
html[data-theme="dark"] ::-webkit-scrollbar-thumb{background:rgba(148,163,184,.35)}
input:focus, textarea:focus, select:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}