/* Laptop Battery Tester - Clean tech / blue */
.lbt-app{
  --lbt-bg:#ffffff;
  --lbt-surface:#f7f9fc;
  --lbt-border:#e3e8ef;
  --lbt-text:#0f172a;
  --lbt-muted:#64748b;
  --lbt-primary:#2563eb;
  --lbt-primary-600:#1d4ed8;
  --lbt-primary-50:#eff6ff;
  --lbt-success:#10b981;
  --lbt-warn:#f59e0b;
  --lbt-danger:#ef4444;
  --lbt-radius:12px;
  --lbt-shadow:0 1px 2px rgba(15,23,42,.04), 0 8px 24px -12px rgba(15,23,42,.12);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,sans-serif;
  color:var(--lbt-text);
  background:var(--lbt-bg);
  border:1px solid var(--lbt-border);
  border-radius:16px;
  padding:24px;
  max-width:1000px;
  margin:24px auto;
  box-shadow:var(--lbt-shadow);
  box-sizing:border-box;
  line-height:1.5;
}
.lbt-app *,.lbt-app *::before,.lbt-app *::after{box-sizing:border-box}

.lbt-header{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:20px}
.lbt-brand{display:flex;align-items:center;gap:12px}
.lbt-logo{display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;border-radius:10px;background:var(--lbt-primary-50);color:var(--lbt-primary)}
.lbt-title{font-size:1.25rem;margin:0;color:var(--lbt-text);font-weight:700;line-height:1.2}
.lbt-subtitle{margin:2px 0 0;color:var(--lbt-muted);font-size:.85rem}

.lbt-tabs{display:flex;flex-wrap:wrap;gap:6px;background:var(--lbt-surface);padding:6px;border-radius:10px;margin-bottom:20px}
.lbt-tab{flex:1;min-width:120px;padding:10px 14px;border:0;background:transparent;color:var(--lbt-muted);font-weight:600;border-radius:8px;cursor:pointer;font-size:.9rem;transition:all .15s ease;font-family:inherit}
.lbt-tab:hover{color:var(--lbt-text)}
.lbt-tab.is-active{background:var(--lbt-bg);color:var(--lbt-primary);box-shadow:0 1px 3px rgba(15,23,42,.08)}

.lbt-panel{display:none;animation:lbt-fade .25s ease}
.lbt-panel.is-active{display:block}
@keyframes lbt-fade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}

.lbt-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}
.lbt-card{background:var(--lbt-surface);border:1px solid var(--lbt-border);border-radius:var(--lbt-radius);padding:20px}
.lbt-card h3{margin:0 0 14px;font-size:1rem;font-weight:700;color:var(--lbt-text)}
.lbt-card--hero{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:18px;background:linear-gradient(135deg,#eff6ff 0%, #dbeafe 100%);border-color:#bfdbfe}

/* Battery visual */
.lbt-battery-visual{display:flex;align-items:center;justify-content:center;gap:4px;width:100%;max-width:260px}
.lbt-battery-shell{position:relative;flex:1;height:120px;border:4px solid var(--lbt-primary);border-radius:14px;background:#fff;overflow:hidden}
.lbt-battery-fill{position:absolute;left:0;top:0;bottom:0;background:linear-gradient(90deg,var(--lbt-primary) 0%,#60a5fa 100%);transition:width .6s ease, background .3s ease;border-radius:8px 0 0 8px}
.lbt-battery-fill.is-low{background:linear-gradient(90deg,var(--lbt-danger),#fca5a5)}
.lbt-battery-fill.is-mid{background:linear-gradient(90deg,var(--lbt-warn),#fcd34d)}
.lbt-battery-fill.is-charging{background:linear-gradient(90deg,var(--lbt-success),#6ee7b7)}
.lbt-battery-pct{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.6rem;color:var(--lbt-text);text-shadow:0 1px 0 rgba(255,255,255,.6)}
.lbt-battery-cap{width:10px;height:40px;background:var(--lbt-primary);border-radius:0 4px 4px 0}

.lbt-status{display:flex;align-items:center;gap:8px;font-size:.9rem;color:var(--lbt-muted);font-weight:500}
.lbt-dot{width:10px;height:10px;border-radius:50%;background:var(--lbt-muted);box-shadow:0 0 0 4px rgba(100,116,139,.15)}
.lbt-dot.is-ok{background:var(--lbt-success);box-shadow:0 0 0 4px rgba(16,185,129,.18)}
.lbt-dot.is-warn{background:var(--lbt-warn);box-shadow:0 0 0 4px rgba(245,158,11,.18)}
.lbt-dot.is-err{background:var(--lbt-danger);box-shadow:0 0 0 4px rgba(239,68,68,.18)}

.lbt-stats{list-style:none;padding:0;margin:0 0 14px;display:grid;gap:8px}
.lbt-stats li{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;background:var(--lbt-bg);border:1px solid var(--lbt-border);border-radius:8px;font-size:.9rem}
.lbt-stats li span{color:var(--lbt-muted)}
.lbt-stats li strong{color:var(--lbt-text);font-weight:600}

.lbt-form{display:grid;gap:12px;margin-bottom:14px}
.lbt-form--mt{margin-top:14px;padding-top:14px;border-top:1px dashed var(--lbt-border)}
.lbt-form label{display:flex;flex-direction:column;gap:6px;font-size:.85rem;color:var(--lbt-muted);font-weight:500}
.lbt-form label small{font-weight:400;opacity:.7}
.lbt-form input,.lbt-search{width:100%;padding:10px 12px;border:1px solid var(--lbt-border);border-radius:8px;background:var(--lbt-bg);color:var(--lbt-text);font-size:.95rem;font-family:inherit;transition:border-color .15s, box-shadow .15s}
.lbt-form input:focus,.lbt-search:focus{outline:none;border-color:var(--lbt-primary);box-shadow:0 0 0 3px rgba(37,99,235,.15)}

.lbt-btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 18px;border-radius:8px;border:1px solid var(--lbt-border);background:var(--lbt-bg);color:var(--lbt-text);font-weight:600;font-size:.9rem;cursor:pointer;font-family:inherit;transition:all .15s ease}
.lbt-btn:hover{border-color:var(--lbt-primary);color:var(--lbt-primary)}
.lbt-btn--primary{background:var(--lbt-primary);border-color:var(--lbt-primary);color:#fff}
.lbt-btn--primary:hover{background:var(--lbt-primary-600);border-color:var(--lbt-primary-600);color:#fff}

.lbt-help{font-size:.8rem;color:var(--lbt-muted);margin:0 0 14px}
.lbt-help code{background:var(--lbt-bg);padding:1px 6px;border-radius:4px;border:1px solid var(--lbt-border);font-size:.8rem}
.lbt-note{font-size:.8rem;color:var(--lbt-muted);margin-bottom:10px;min-height:1em}

.lbt-result{margin-top:18px;padding-top:18px;border-top:1px solid var(--lbt-border)}
.lbt-meter{height:14px;background:var(--lbt-bg);border:1px solid var(--lbt-border);border-radius:99px;overflow:hidden;margin-bottom:14px}
.lbt-meter-fill{height:100%;width:0;background:linear-gradient(90deg,var(--lbt-success),#34d399);border-radius:99px;transition:width .6s ease, background .3s ease}
.lbt-meter-fill.is-warn{background:linear-gradient(90deg,var(--lbt-warn),#fbbf24)}
.lbt-meter-fill.is-bad{background:linear-gradient(90deg,var(--lbt-danger),#f87171)}
.lbt-result-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px;margin-bottom:10px}
.lbt-result-grid > div{background:var(--lbt-bg);border:1px solid var(--lbt-border);border-radius:8px;padding:10px 12px}
.lbt-result-grid span{display:block;font-size:.75rem;color:var(--lbt-muted);text-transform:uppercase;letter-spacing:.04em;margin-bottom:4px}
.lbt-result-grid strong{font-size:1.1rem;color:var(--lbt-text)}
.lbt-result-line{margin-top:14px;padding:12px 14px;background:var(--lbt-primary-50);border:1px solid #bfdbfe;border-radius:8px;color:var(--lbt-primary-600);font-weight:600;font-size:.95rem;min-height:1em}
.lbt-result-line:empty{display:none}

.lbt-info-list{display:grid;gap:10px;margin-top:14px}
.lbt-info-item{background:var(--lbt-bg);border:1px solid var(--lbt-border);border-radius:8px;padding:14px}
.lbt-info-item h4{margin:0 0 4px;font-size:.95rem;color:var(--lbt-primary)}
.lbt-info-item p{margin:0;font-size:.85rem;color:var(--lbt-muted)}
.lbt-info-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.lbt-info-tag{background:var(--lbt-primary-50);color:var(--lbt-primary-600);font-size:.7rem;padding:2px 8px;border-radius:99px;font-weight:600}

.lbt-footer{margin-top:20px;padding-top:16px;border-top:1px solid var(--lbt-border);color:var(--lbt-muted);font-size:.78rem;text-align:center}

/* Export panel */
.lbt-export-summary{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin-bottom:18px}
.lbt-export-block{background:var(--lbt-bg);border:1px solid var(--lbt-border);border-radius:8px;padding:14px}
.lbt-export-block h4{margin:0 0 10px;font-size:.85rem;text-transform:uppercase;letter-spacing:.04em;color:var(--lbt-primary);font-weight:700}
.lbt-export-list{list-style:none;padding:0;margin:0;display:grid;gap:6px;font-size:.85rem}
.lbt-export-list li{display:flex;justify-content:space-between;gap:10px;padding:6px 0;border-bottom:1px dashed var(--lbt-border)}
.lbt-export-list li:last-child{border-bottom:0}
.lbt-export-list span{color:var(--lbt-muted)}
.lbt-export-list strong{color:var(--lbt-text);font-weight:600;text-align:right}
.lbt-export-actions{display:flex;flex-wrap:wrap;gap:10px}

@media (max-width:540px){
  .lbt-app{padding:16px;margin:12px}
  .lbt-title{font-size:1.1rem}
  .lbt-battery-pct{font-size:1.3rem}
}