.tech-batteries-guide {
  --bg: var(--bg, #f8fafc);
  --card: var(--panel);
  --card-hi: #f1f5f9;
  --amber: var(--gold);
  --teal: #0f766e;
  --red: #dc2626;
  --text: var(--text);
  --muted: var(--muted);
  --line: var(--border);
  color: var(--text);
  font-size: 16px;
  line-height: 1.85;
}.tech-batteries-guide h1, .tech-batteries-guide h2, .tech-batteries-guide h3, .tech-batteries-guide h4{font-family:'Changa',sans-serif;line-height:1.4}.tech-batteries-guide .num, .tech-batteries-guide code, .tech-batteries-guide .mono{font-family:'IBM Plex Mono',monospace;direction:ltr;unicode-bidi:embed;color:var(--teal);font-size:.93em}
.tech-batteries-guide .tb-wrap{max-width:1120px;margin:0 auto;padding:0 22px}.tech-batteries-guide /* ===== Header ===== */
.tech-batteries-guide .tb-hero{padding:56px 0 34px;border-bottom:1px solid var(--line)}.tech-batteries-guide .eyebrow{
  display:inline-block;font-family:'IBM Plex Mono',monospace;direction:ltr;
  font-size:.78rem;letter-spacing:.18em;color:var(--amber);
  border:1px solid var(--amber);border-radius:6px;padding:5px 14px;margin-bottom:20px
}
.tech-batteries-guide .tb-hero h1{font-size:clamp(1.8rem,4.2vw,3rem);font-weight:800;margin-bottom:14px}
.tech-batteries-guide .tb-hero h1 .hl{color:var(--amber)}
.tech-batteries-guide .tb-hero p.lead{color:var(--muted);max-width:820px;font-size:1.05rem;margin-bottom:26px}.tech-batteries-guide .kw-chips{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.tech-batteries-guide .kw-chip{
  background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:14px 16px;font-size:.86rem;color:var(--muted);line-height:1.7
}.tech-batteries-guide .kw-chip b{display:block;color:var(--text);font-size:.92rem;margin-bottom:2px;font-family:'Changa',sans-serif}.tech-batteries-guide .kw-chip .num{font-weight:600}.tech-batteries-guide /* ===== Nav ===== */
.tech-batteries-guide /* ===== Sections ===== */
.tech-batteries-guide .tb-sec{padding:52px 0 22px;border-bottom:1px solid var(--line)}.tech-batteries-guide .sec-head{margin-bottom:26px}.tech-batteries-guide .sec-head .sn{
  font-family:'IBM Plex Mono',monospace;direction:ltr;display:inline-block;
  color:var(--amber);font-size:.85rem;letter-spacing:.2em;border-bottom:2px solid var(--amber);
  padding-bottom:4px;margin-bottom:10px
}.tech-batteries-guide .sec-head h2{font-size:clamp(1.4rem,3vw,2rem);font-weight:700}.tech-batteries-guide .sec-head p.sub{color:var(--muted);max-width:860px;margin-top:8px}.tech-batteries-guide /* ===== Cards ===== */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px}.tech-batteries-guide .grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.tech-batteries-guide .card{
  background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:22px 22px 18px;margin-bottom:18px
}.tech-batteries-guide .card h3{color:var(--amber);font-size:1.12rem;margin-bottom:10px;font-weight:600}.tech-batteries-guide .card h4{color:var(--teal);font-size:1rem;margin:14px 0 6px}.tech-batteries-guide .card p{margin-bottom:10px}.tech-batteries-guide .card p:last-child{margin-bottom:0}.tech-batteries-guide .kw-flag{
  margin-top:12px;padding:12px 14px;background:var(--card-hi);border-radius:10px;
  border-inline-start:3px solid var(--amber);font-size:.93rem;color:var(--text)
}.tech-batteries-guide .kw-flag b{color:var(--amber)}.tech-batteries-guide /* ===== Alerts ===== */
.note, .tech-batteries-guide .warn, .tech-batteries-guide .tip{border-radius:12px;padding:15px 18px;margin:16px 0;font-size:.95rem;border:1px solid}.tech-batteries-guide .note{background:rgba(242,166,59,.08);border-color:rgba(242,166,59,.4)}.tech-batteries-guide .note b{color:var(--amber)}.tech-batteries-guide .warn{background:rgba(231,109,91,.08);border-color:rgba(231,109,91,.45)}.tech-batteries-guide .warn b{color:var(--red)}.tech-batteries-guide .tip{background:rgba(87,199,190,.07);border-color:rgba(87,199,190,.4)}.tech-batteries-guide .tip b{color:var(--teal)}.tech-batteries-guide /* ===== Lists ===== */
ul.clean{list-style:none;margin:8px 0 12px}.tech-batteries-guide ul.clean li{padding-inline-start:22px;position:relative;margin-bottom:8px}.tech-batteries-guide ul.clean li::before{
  content:"";position:absolute;inset-inline-start:2px;top:.62em;
  width:8px;height:8px;background:var(--amber);transform:rotate(45deg)
}.tech-batteries-guide ol.steps{list-style:none;counter-reset:st;margin:10px 0 12px}.tech-batteries-guide ol.steps li{counter-increment:st;position:relative;padding-inline-start:42px;margin-bottom:12px}.tech-batteries-guide ol.steps li::before{
  content:counter(st);position:absolute;inset-inline-start:0;top:.1em;
  width:28px;height:28px;border-radius:50%;background:var(--card-hi);
  border:1px solid var(--amber);color:var(--amber);
  font-family:'IBM Plex Mono',monospace;font-size:.85rem;
  display:flex;align-items:center;justify-content:center
}.tech-batteries-guide /* ===== Tables ===== */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;margin:16px 0}.tech-batteries-guide table{border-collapse:collapse;width:100%;min-width:720px;font-size:.9rem}.tech-batteries-guide th{background:var(--card-hi);color:var(--amber);font-family:'Changa',sans-serif;font-weight:600;text-align:right;padding:12px 14px;border-bottom:2px solid var(--line);white-space:nowrap}.tech-batteries-guide td{padding:11px 14px;border-bottom:1px solid var(--line);vertical-align:top;background:var(--card)}.tech-batteries-guide tr:last-child td{border-bottom:none}.tech-batteries-guide td .num{white-space:nowrap}.tech-batteries-guide .good{color:#5BD08F;font-weight:600}.tech-batteries-guide .mid{color:var(--amber);font-weight:600}.tech-batteries-guide .bad{color:var(--red);font-weight:600}.tech-batteries-guide /* ===== Calculator ===== */
.calc{background:var(--card);border:1px solid var(--amber);border-radius:16px;padding:26px;margin:22px 0}.tech-batteries-guide .calc h3{color:var(--amber);font-size:1.25rem;margin-bottom:18px}.tech-batteries-guide .calc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:20px}.tech-batteries-guide .field label{display:block;font-size:.88rem;color:var(--muted);margin-bottom:6px}.tech-batteries-guide .field input, .tech-batteries-guide .field select{
  width:100%;background:var(--bg);border:1px solid var(--line);border-radius:9px;
  color:var(--text);padding:10px 12px;font-family:'IBM Plex Mono',monospace;font-size:1rem;direction:ltr;text-align:left
}.tech-batteries-guide .field select{font-family:'IBM Plex Sans Arabic',sans-serif;direction:rtl;text-align:right}.tech-batteries-guide .field input:focus, .tech-batteries-guide .field select:focus{outline:2px solid var(--amber);outline-offset:1px}.tech-batteries-guide .calc-out{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:8px}.tech-batteries-guide .out-box{background:var(--card-hi);border-radius:12px;padding:14px 16px}.tech-batteries-guide .out-box .lbl{font-size:.8rem;color:var(--muted);margin-bottom:4px}.tech-batteries-guide .out-box .val{font-family:'IBM Plex Mono',monospace;direction:ltr;font-size:1.35rem;font-weight:600;color:var(--teal)}.tech-batteries-guide .out-box .val small{font-size:.7em;color:var(--muted)}.tech-batteries-guide .verdicts{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:16px}.tech-batteries-guide .verdict{border-radius:12px;padding:16px;border:1px solid var(--line);background:var(--card-hi)}.tech-batteries-guide .verdict .vt{font-family:'Changa',sans-serif;font-weight:600;margin-bottom:8px}.tech-batteries-guide .vbar{height:10px;border-radius:6px;background:#22304A;overflow:hidden;margin-top:8px}.tech-batteries-guide .vbar span{display:block;height:100%;border-radius:6px;transition:width .4s ease, background .4s ease}.tech-batteries-guide #calcAlert{display:none}.tech-batteries-guide #calcAlert.show{display:block}.tech-batteries-guide /* ===== Datasheet ===== */
.ds-layout{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:20px;align-items:start}.tech-batteries-guide .datasheet{
  background:#F7F5EF;color:#1C2431;border-radius:14px;padding:24px;
  box-shadow:0 8px 30px rgba(0,0,0,.4)
}.tech-batteries-guide .datasheet h3{color:#1C2431;border-bottom:3px solid var(--amber);padding-bottom:8px;margin-bottom:6px;font-size:1.15rem}.tech-batteries-guide .datasheet .ds-model{font-family:'IBM Plex Mono',monospace;direction:ltr;text-align:left;color:#5A6472;font-size:.82rem;margin-bottom:14px}.tech-batteries-guide .ds-group{margin-bottom:14px}.tech-batteries-guide .ds-group>.gt{
  font-family:'Changa',sans-serif;font-weight:700;font-size:.85rem;color:#8A5A17;
  background:rgba(242,166,59,.18);padding:5px 12px;border-radius:6px;margin-bottom:4px
}.tech-batteries-guide .ds-row{
  display:flex;justify-content:space-between;gap:12px;padding:8px 12px;border-radius:7px;
  cursor:pointer;border:1px solid transparent;font-size:.88rem
}.tech-batteries-guide .ds-row:hover{background:rgba(242,166,59,.12)}.tech-batteries-guide .ds-row:focus-visible{outline:2px solid var(--amber)}.tech-batteries-guide .ds-row.active{background:rgba(242,166,59,.22);border-color:var(--amber)}.tech-batteries-guide .ds-row .k{font-weight:600}.tech-batteries-guide .ds-row .v{font-family:'IBM Plex Mono',monospace;direction:ltr;color:#3A4656;white-space:nowrap}.tech-batteries-guide .ds-explain{position:sticky;top:70px}.tech-batteries-guide .ds-explain .card{border-color:var(--amber)}.tech-batteries-guide .ds-explain .en{font-family:'IBM Plex Mono',monospace;direction:ltr;display:inline-block;color:var(--teal);font-size:.85rem;background:var(--bg);border-radius:6px;padding:3px 10px;margin-bottom:10px}.tech-batteries-guide .ds-explain .kwn{margin-top:14px;padding:13px 15px;background:var(--card-hi);border-radius:10px;border-inline-start:3px solid var(--amber);font-size:.92rem}.tech-batteries-guide /* ===== Checklist ===== */
.chk{list-style:none;margin:14px 0}.tech-batteries-guide .chk li{margin-bottom:10px}.tech-batteries-guide .chk label{
  display:flex;gap:12px;align-items:flex-start;background:var(--card);
  border:1px solid var(--line);border-radius:11px;padding:13px 16px;cursor:pointer;transition:.2s
}.tech-batteries-guide .chk label:hover{border-color:var(--amber)}.tech-batteries-guide .chk input{margin-top:5px;accent-color:var(--amber);width:18px;height:18px;flex:0 0 auto}.tech-batteries-guide .chk input:checked + span{text-decoration:line-through;color:var(--muted)}

.tech-batteries-guide .tb-foot{padding:40px 0 60px;color:var(--muted);font-size:.88rem;text-align:center}

@media (max-width:820px){.tech-batteries-guide .grid2, .tech-batteries-guide .grid3, .tech-batteries-guide .kw-chips, .tech-batteries-guide .calc-grid, .tech-batteries-guide .calc-out, .tech-batteries-guide .verdicts, .tech-batteries-guide .ds-layout{grid-template-columns:1fr}.tech-batteries-guide .ds-explain{position:static}
  
}
@media (prefers-reduced-motion:reduce){.tech-batteries-guide .vbar span{transition:none}
}

.tech-batteries-guide .tb-hero { padding: 8px 0 28px; border-bottom: 1px solid var(--line); }
.tech-batteries-guide .eyebrow {
  background: rgba(180,134,0,.12);
  border-color: var(--accent);
  color: var(--gold);
  border-radius: 999px;
}
.tech-batteries-guide .tb-toc {
  position: relative;
  top: auto !important;
  z-index: 5;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  margin: 20px 0 28px;
  padding: 18px 16px;
  box-shadow: var(--shadow);
}
.tech-batteries-guide .tb-toc .inner {
  display: block;
  columns: 3;
  column-gap: 12px;
  padding: 0;
  max-width: none;
  margin: 0;
  overflow: visible;
}
.tech-batteries-guide .tb-toc a {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: unset;
  width: 100%;
  box-sizing: border-box;
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 800;
  font-family: inherit;
  line-height: 1.45;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #f8fafc;
  white-space: normal;
  margin: 0 0 8px;
  break-inside: avoid;
  -webkit-column-break-inside: avoid;
  page-break-inside: avoid;
  transition: border-color .15s, background .15s, transform .15s;
}
.tech-batteries-guide .tb-toc a:hover,
.tech-batteries-guide .tb-toc a:focus-visible {
  color: var(--text);
  border-color: var(--accent);
  background: rgba(180, 134, 0, 0.1);
  outline: none;
  transform: translateY(-1px);
}
.tech-batteries-guide .tb-toc a .n {
  flex: 0 0 auto;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  color: var(--gold);
  font-size: 0.9rem;
  font-weight: 700;
  margin-inline-end: 0;
  min-width: 1.8em;
}
@media (max-width: 820px) {
  .tech-batteries-guide .tb-toc .inner {
    columns: 2;
  }
}
@media (max-width: 520px) {
  .tech-batteries-guide .tb-toc .inner {
    columns: 1;
  }
  .tech-batteries-guide .tb-toc a {
    font-size: 1rem;
    padding: 14px 16px;
  }
}
.tech-batteries-guide .tb-sec {
  padding: 36px 0 12px;
  border-bottom: 1px dashed var(--line);
  scroll-margin-top: 160px;
}
.tech-batteries-guide .tb-sec:last-of-type { border-bottom: none; }
.tech-batteries-guide .kw-chip,
.tech-batteries-guide .card,
.tech-batteries-guide .tbl-wrap,
.tech-batteries-guide .calc,
.tech-batteries-guide .chk,
.tech-batteries-guide .datasheet {
  background: var(--panel);
  box-shadow: var(--shadow);
}
.tech-batteries-guide .tb-hero h1 { font-weight: 900; font-size: clamp(1.6rem, 3.5vw, 2.2rem); }
.tech-batteries-guide .sec-head h2 { font-weight: 900; font-size: clamp(1.2rem, 2.5vw, 1.55rem); }
.tech-batteries-guide .field input,
.tech-batteries-guide .field select,
.tech-batteries-guide .calc input,
.tech-batteries-guide .calc select {
  background: #f1f5f9;
  color: var(--text);
  border: 1px solid var(--line);
}
.tech-batteries-guide .good { color: #15803d; font-weight: 700; }
.tech-batteries-guide .mid { color: var(--gold); font-weight: 700; }
.tech-batteries-guide .bad { color: #dc2626; font-weight: 700; }
.tech-batteries-guide .tb-foot {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}
.tech-batteries-guide .ds-explain,
.tech-batteries-guide .out-box,
.tech-batteries-guide .verdict {
  background: #f1f5f9;
}
.tech-batteries-guide .kw-flag { background: #f1f5f9; }