/* eCircuitCalc — Datasheet Reading Guide (reuses base.css tokens) */
.rprog{position:fixed;top:0;left:0;right:0;height:3px;z-index:120;pointer-events:none}
.rprog span{display:block;height:100%;width:0;background:var(--grad);transition:width .1s linear}
.article{min-height:60vh}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* Sticky section nav */
.dsg-bar{position:sticky;top:var(--nav-h);z-index:90;background:color-mix(in srgb,var(--bg) 84%,transparent);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.dsg-chips{display:flex;gap:.4rem;overflow-x:auto;padding:.6rem 0 .75rem;scrollbar-width:thin;scrollbar-color:var(--border2) transparent}
.dsg-chips::-webkit-scrollbar{height:6px}
.dsg-chips::-webkit-scrollbar-thumb{background:var(--border2);border-radius:99px}
.dsg-chip{flex:none;font-size:.8rem;padding:.42rem .82rem;border-radius:999px;border:1px solid var(--border);
  color:var(--text2);background:var(--surface);white-space:nowrap;transition:transform .2s var(--ease),color .2s,border-color .2s}
.dsg-chip:hover{color:var(--accent);border-color:var(--accent);transform:translateY(-1px)}
.dsg-chip.active{color:#fff;background:var(--grad);border-color:transparent}

/* Prose */
.prose{width:min(1180px,92%);margin:0 auto;display:grid;gap:clamp(2.4rem,5vw,3.6rem);padding:1.5rem 0 2rem}
.prose section{scroll-margin-top:120px}
.prose h2{font-size:clamp(1.35rem,3vw,1.8rem);font-weight:800;letter-spacing:-.02em;margin-bottom:.9rem}
.prose h3{font-size:1.08rem;margin:1.4rem 0 .5rem}
.prose p{color:var(--text2);line-height:1.7;margin-bottom:.9rem}
.prose ul,.prose ol{color:var(--text2);line-height:1.7;margin:0 0 .9rem 1.2rem}
.prose li{margin-bottom:.35rem}
.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.muted{color:var(--text2);font-size:.94rem}

/* Callouts */
.callout{border:1px solid var(--border);border-left:3px solid var(--accent);background:var(--surface);
  border-radius:0 12px 12px 0;padding:1rem 1.2rem;margin:1.1rem 0}
.callout p{margin:0}
.callout .tag{display:inline-block;font-family:var(--mono);font-size:.62rem;letter-spacing:.12em;text-transform:uppercase;margin-bottom:.4rem;font-weight:600}
.callout.pitfall{border-left-color:#fbbf24}
.callout.pitfall .tag{color:#fbbf24}
.callout.important{border-left-color:var(--accent2)}
.callout.important .tag{color:var(--accent2)}
.callout.takeaway{border-left-color:var(--accent);background:color-mix(in srgb,var(--accent) 8%,var(--surface))}
.callout.takeaway .tag{color:var(--accent)}

/* Formula block */
.formula{font-family:var(--mono);font-size:1.02rem;color:var(--accent);background:var(--surface);
  border:1px solid var(--border);border-radius:10px;padding:.85rem 1rem;margin:.9rem 0;overflow-x:auto;white-space:nowrap}

/* Expandable */
details.ex{margin:1.1rem 0;border:1px solid var(--border);border-radius:12px;background:var(--surface);overflow:hidden}
details.ex summary{cursor:pointer;list-style:none;padding:.85rem 1.1rem;font-weight:600;font-size:.95rem;
  display:flex;justify-content:space-between;align-items:center;gap:.6rem}
details.ex summary::-webkit-details-marker{display:none}
details.ex summary::after{content:"+";color:var(--accent);font-size:1.2rem;transition:transform .25s var(--ease)}
details.ex[open] summary::after{transform:rotate(45deg)}
details.ex summary:focus-visible{outline:2px solid var(--accent);outline-offset:-2px;border-radius:12px}
details.ex p{margin:0;padding:0 1.1rem 1rem}

/* Table helpers (base provides table / .table-wrap) */
.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:14px;background:var(--surface);margin:1rem 0}
.ftable{width:100%;border-collapse:collapse;min-width:560px}
.ftable caption{caption-side:top;text-align:left;padding:.9rem 1.1rem .35rem;font-family:var(--mono);
  font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--text2)}
.ftable th,.ftable td{padding:.62rem .9rem;text-align:left;border-bottom:1px solid var(--border);font-size:.9rem;vertical-align:top}
.ftable th{font-family:var(--mono);font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;color:var(--text2);
  background:var(--surface2);position:sticky;top:0}
.ftable tbody tr{transition:background .15s}
.ftable tbody tr:hover{background:var(--surface2)}
.ftable tbody tr:last-child td{border-bottom:0}
.f{font-family:var(--mono);color:var(--accent);font-weight:600}
.ftable .f{white-space:normal}
.spec .colhl{background:color-mix(in srgb,var(--accent) 15%,transparent)}
.spec th[data-col]{cursor:pointer;user-select:none;transition:background .15s}
.spec th[data-col]:hover{background:var(--surface2)}
.fn{color:var(--accent);font-size:.7em;vertical-align:super;cursor:help;font-family:var(--mono)}
.tip{border-bottom:1px dashed var(--accent);cursor:help}

/* Figure / SVG */
.fig{padding:1.2rem;border-radius:16px;background:var(--bg2);border:1px solid var(--border)}
.fig-svg{width:100%;height:auto;max-width:720px;margin:0 auto;display:block}
.fig figcaption{margin-top:1rem;font-size:.9rem;color:var(--text2);line-height:1.6}
.fig figcaption strong{color:var(--text)}

/* Min/Typ/Max widget */
.mm{margin:1.2rem 0;border:1px solid var(--border);border-radius:14px;background:var(--surface);padding:1.1rem}
.mm-btns{display:flex;gap:.5rem;flex-wrap:wrap;margin-bottom:.9rem}
.mm-btn{font-size:.82rem;font-weight:600;padding:.5rem .9rem;border-radius:10px;border:1px solid var(--border2);
  background:var(--surface2);color:var(--text2);cursor:pointer;transition:.2s}
.mm-btn:hover{color:var(--accent);border-color:var(--accent)}
.mm-btn.active{color:#fff;background:var(--grad);border-color:transparent}
.mm-status{margin:.9rem 0 0;font-size:.9rem;color:var(--text2);min-height:1.2em}

/* Typical vs guaranteed */
.cmp{margin:1.2rem 0;border:1px solid var(--border);border-radius:14px;background:var(--surface);padding:1.1rem;text-align:center}
.cmp-toggle{display:flex;gap:.5rem;justify-content:center;flex-wrap:wrap;margin-bottom:.9rem}
.cmp-btn{font-size:.82rem;font-weight:600;padding:.5rem .9rem;border-radius:10px;border:1px solid var(--border2);
  background:var(--surface2);color:var(--text2);cursor:pointer;transition:.2s}
.cmp-btn:hover{color:var(--accent);border-color:var(--accent)}
.cmp-btn.active{color:#fff;background:var(--grad);border-color:transparent}
.cmp-val{font-family:var(--mono);font-size:1.7rem;font-weight:800;color:var(--accent);margin:.2rem 0}
.cmp-meta{font-size:.9rem;color:var(--text2)}

/* Thermal calc */
.calc{margin:1.2rem 0;border:1px solid var(--border);border-radius:14px;background:var(--surface);padding:1.2rem;display:grid;gap:.9rem}
.calc h3{margin:0 0 .2rem}
.calc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:.8rem}
.calc .field{margin:0}
.calc-out{display:flex;align-items:baseline;gap:.7rem;flex-wrap:wrap;padding-top:.5rem;border-top:1px solid var(--border)}
.calc-out .big{font-family:var(--mono);font-size:1.9rem;font-weight:800;color:var(--accent)}
.calc-out .ok{color:#4ade80;font-weight:600}
.calc-out .over{color:#f87171;font-weight:600}
.calc-out .na{color:var(--text2)}

/* Progress */
.progress{height:8px;border-radius:99px;background:var(--surface2);overflow:hidden}
.progress i{display:block;height:100%;width:0;background:var(--grad);transition:width .3s var(--ease)}
.progress-lbl{font-family:var(--mono);font-size:.75rem;color:var(--text2);margin:.4rem 0 0}

/* Steps (workflow) */
.steps{display:grid;gap:.7rem;margin:1rem 0}
.step{display:flex;gap:.9rem;align-items:flex-start;padding:1rem 1.1rem;border:1px solid var(--border);
  border-radius:12px;background:var(--surface);cursor:pointer;transition:border-color .2s,background .2s}
.step:hover{border-color:var(--border2)}
.step:focus-within{outline:2px solid var(--accent);outline-offset:2px}
.step .n{flex:none;width:30px;height:30px;border-radius:50%;display:grid;place-items:center;font-family:var(--mono);
  font-weight:700;font-size:.9rem;background:var(--surface2);border:1px solid var(--border2);transition:.2s}
.step .body h3{font-size:1rem;margin:0 0 .2rem}
.step .body p{font-size:.9rem;color:var(--text2);margin:0}
.step.done{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 7%,var(--surface))}
.step.done .n{background:var(--grad);color:#fff;border-color:transparent}

/* Checklist */
.check{display:grid;gap:.5rem;margin:1rem 0}
.check label{display:flex;gap:.7rem;align-items:flex-start;padding:.75rem .95rem;border:1px solid var(--border);
  border-radius:10px;background:var(--surface);cursor:pointer;transition:.2s;font-size:.92rem;color:var(--text2)}
.check label:hover{border-color:var(--border2)}
.check input{margin-top:.2rem;accent-color:var(--accent)}
.check label.done{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 7%,var(--surface));color:var(--text)}
.check label:focus-within{outline:2px solid var(--accent);outline-offset:2px}

/* Ad slot (auto-hides when empty) */
.ad-slot{max-width:728px;margin:1.5rem auto;text-align:center;transition:max-height .5s var(--ease),opacity .4s,margin .5s;max-height:160px;overflow:hidden}
.ad-slot.ad-hidden{max-height:0;opacity:0;margin:0}
.ad-label{display:block;font-family:var(--mono);font-size:.6rem;letter-spacing:.2em;text-transform:uppercase;color:var(--text2);opacity:.6;margin-bottom:.4rem}
.ad-box{min-height:90px;border:1.5px dashed var(--border2);border-radius:12px;display:grid;place-items:center;color:var(--text2);font-size:.85rem;background:var(--surface)}

/* Animated SVG */
.ds-wire{fill:none;stroke:var(--wbase);stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.ds-comp{fill:none;stroke:var(--cw);stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.ds-lbl{fill:var(--text);font-family:var(--mono);font-size:13px;font-weight:600}
.ds-lbl.sm{font-size:10px;fill:var(--text2);font-weight:400}
.ds-flow{fill:none;stroke:var(--accent);stroke-width:2.6;stroke-linecap:round;stroke-dasharray:6 10;
  animation:dsflow .9s linear infinite;filter:drop-shadow(0 0 4px var(--glow))}
.ds-gate{fill:none;stroke:var(--accent2);stroke-width:2;stroke-linecap:round;stroke-dasharray:4 8;animation:dsflow 1.2s linear infinite}
.ds-glow{fill:none;stroke:var(--accent);stroke-width:2;filter:drop-shadow(0 0 6px var(--glow));animation:dsglow 2s ease-in-out infinite}
.ds-heat{stroke:#fbbf24;stroke-width:2;stroke-linecap:round;animation:dsheat 1.8s ease-in infinite}
.ds-heat.h2{animation-delay:.6s}
.ds-heat.h3{animation-delay:1.2s}
.ds-doc{fill:var(--surface);stroke:var(--border);stroke-width:1.4}
.ds-docbar{fill:var(--surface2)}
.ds-tln{fill:var(--border2)}
.ds-box{fill:var(--surface2);stroke-width:1.6;animation:dsbox 1.8s ease-in-out infinite}
.ds-box.max{stroke:#f87171;animation-delay:0s}
.ds-box.op{stroke:var(--accent);animation-delay:.6s}
.ds-box.th{stroke:#fbbf24;animation-delay:1.2s}
.ds-lead{stroke:var(--text2);stroke-width:1.5;stroke-dasharray:4 6;fill:none}
.ds-mag{stroke:var(--text2);stroke-width:2;fill:none;stroke-linecap:round}
.ds-strip{fill:var(--surface);stroke:var(--border);stroke-width:1.4}
.ds-chip{fill:var(--accent);font-family:var(--mono);font-size:13px;font-weight:600}
@keyframes dsflow{to{stroke-dashoffset:-16}}
@keyframes dsglow{0%,100%{opacity:.25}50%{opacity:.9}}
@keyframes dsheat{0%{transform:translateY(0);opacity:0}30%{opacity:.8}100%{transform:translateY(-16px);opacity:0}}
@keyframes dsbox{0%,100%{opacity:.5}50%{opacity:1;filter:drop-shadow(0 0 6px var(--glow))}}

/* Reduced motion */
@media (prefers-reduced-motion:reduce){
  .rprog span{transition:none}
  .ds-flow,.ds-gate,.ds-glow,.ds-heat,.ds-box{animation:none}
  .ds-heat{opacity:.4}
  .ds-box{opacity:1}
  .progress i,.step,.check label,.dsg-chip{transition:none}
}

/* Responsive */
@media (max-width:640px){
  .calc-grid{grid-template-columns:1fr 1fr}
  .cmp-val{font-size:1.4rem}
  .step{padding:.9rem}
}