/* eCircuitCalc — Unit Conversion Tables (reuses base.css tokens) */

/* Reading progress */
.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 shell */
.article{min-height:60vh}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}
.prose{width:min(1180px,92%);margin:0 auto;display:grid;gap:clamp(2.4rem,5vw,3.6rem);padding:2rem 0}
.prose section{scroll-margin-top:90px}
.prose h2{font-size:clamp(1.4rem,3vw,1.9rem);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);margin-bottom:.9rem;line-height:1.7}
.prose li{color:var(--text2);margin:.4rem 0 0 1.1rem;list-style:disc}
.prose ol li{list-style:decimal}
.muted{color:var(--text2);font-size:.94rem}
.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}

/* 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:1.2rem 0}
.callout p{margin:0}
.callout.pitfall{border-left-color:#fbbf24}
.formula{font-family:var(--mono);font-size:.92rem;background:var(--surface);border:1px solid var(--border);
  border-radius:12px;padding:.9rem 1.1rem;margin:1.1rem 0;color:var(--text);overflow-x:auto;white-space:nowrap}

/* Expandable examples */
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}
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 ul{margin:0 0 1rem 1.2rem;padding:0 1.1rem 1rem}
details.ex li{list-style:disc}

/* TOC */
.toc{padding:1.4rem 0;border-block:1px solid var(--border);background:var(--bg2)}
.toc .container{display:flex;gap:1.5rem;align-items:baseline;flex-wrap:wrap}
.toc strong{font-family:var(--mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent)}
.toc ol{display:flex;flex-wrap:wrap;gap:.35rem .9rem;list-style:none;margin:0;padding:0;counter-reset:t}
.toc li{counter-increment:t}
.toc a{color:var(--text2);font-size:.86rem}
.toc a::before{content:counter(t) ".";color:var(--accent);margin-right:.3rem;font-family:var(--mono)}
.toc a:hover{color:var(--accent)}

/* Animated circuit figure */
.fig-sec{padding:0 4% 1rem;margin:0 auto}
.fig{padding:1.2rem;border-radius:16px;background:var(--bg2);border:1px solid var(--border)}
.fig-svg{width:100%;height:auto;max-width:660px;margin:0 auto;display:block}
.fig figcaption{margin-top:1rem;font-size:.9rem;color:var(--text2);line-height:1.6}
.uc-wire{fill:none;stroke:var(--wbase);stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.uc-comp{fill:none;stroke:var(--cw);stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.uc-thick{stroke-width:5}
.uc-node{fill:var(--cw)}
.uc-lbl{fill:var(--text);font-family:var(--mono);font-size:14px;font-weight:600}
.uc-lbl.sm{font-size:11px;fill:var(--text2);font-weight:400}
.uc-arr{fill:none;stroke:var(--accent);stroke-width:3;stroke-linecap:round;filter:drop-shadow(0 0 4px var(--glow))}
.uc-flow{fill:none;stroke:var(--accent);stroke-width:2.6;stroke-linecap:round;stroke-dasharray:7 11;
  animation:ucflow .9s linear infinite;filter:drop-shadow(0 0 4px var(--glow))}
@keyframes ucflow{to{stroke-dashoffset:-18}}
.uc-panel{fill:var(--surface);stroke:var(--border);stroke-width:1.4}
.uc-live{fill:#4ade80;animation:uclive 1.5s ease-in-out infinite}
@keyframes uclive{50%{opacity:.35}}
.uc-ro{fill:var(--text);font-family:var(--mono);font-size:12.5px;font-weight:600}
.uc-ro2{fill:var(--accent);font-family:var(--mono);font-size:11px}

/* Converter */
.conv-sec{padding:0 4%;max-width:1280px;margin:0 auto}
.conv{padding:1.6rem}
.conv h2{font-size:1.4rem;font-weight:800;letter-spacing:-.02em;margin-bottom:.5rem}
.conv .muted{margin-bottom:1.3rem}
.conv-row{display:flex;flex-wrap:wrap;align-items:end;gap:.9rem;margin-bottom:1rem}
.conv-row label{display:flex;flex-direction:column;gap:.35rem;font-size:.78rem;font-weight:600;color:var(--text2)}
.conv-row select,.conv-row input{padding:.65rem .8rem;border-radius:10px;border:1px solid var(--border2);
  background:var(--bg);color:var(--text);font:inherit;min-width:120px}
.conv-row input{min-width:130px;font-family:var(--mono)}
.conv-row select:focus,.conv-row input:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 3px var(--glow)}
#convForm .icon-btn{margin-bottom:.15rem}
.conv-result{display:flex;align-items:center;gap:1rem;flex-wrap:wrap;padding:1rem 1.1rem;border-radius:12px;
  background:var(--surface);border:1px solid var(--border2)}
.conv-result output{flex:1;min-width:200px;font-family:var(--mono);font-size:1.15rem;font-weight:600;color:var(--accent);word-break:break-word}

/* Tables */
#tables{padding:1rem 4%;max-width:1120px;margin:0 auto}
#tables h2{font-size:1.4rem;font-weight:800;letter-spacing:-.02em;margin:1.8rem 0 .4rem}
#tables .muted{margin-bottom:1rem}
.tbl-tools{display:flex;flex-wrap:wrap;gap:.9rem;align-items:end;margin-bottom:.9rem}
.tbl-tools label{display:flex;flex-direction:column;gap:.35rem;font-size:.78rem;font-weight:600;color:var(--text2)}
.tbl-tools label.grow{flex:1 1 240px}
.tbl-tools input,.tbl-tools select{padding:.6rem .8rem;border-radius:10px;border:1px solid var(--border2);
  background:var(--bg);color:var(--text);font:inherit}
.tbl-tools input:focus,.tbl-tools select:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 3px var(--glow)}
.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:14px;background:var(--surface);margin-bottom:1rem}
.cmp-table{width:100%;border-collapse:collapse;min-width:640px}
.cmp-table caption{caption-side:top;text-align:left;padding:.9rem 1.1rem .3rem;font-family:var(--mono);
  font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--text2)}
.cmp-table th,.cmp-table td{padding:.65rem .95rem;text-align:left;border-bottom:1px solid var(--border);font-size:.92rem;vertical-align:top}
.cmp-table th{font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--text2);
  background:var(--surface2);position:sticky;top:0}
.cmp-table tbody tr{transition:background .15s}
.cmp-table tbody tr:hover{background:var(--surface2)}
.cmp-table tbody tr:last-child td{border-bottom:0}
.cmp-table .num{text-align:right;font-family:var(--mono);white-space:nowrap}
.cmp-table .sym{font-family:var(--mono);font-weight:600;color:var(--accent)}
.cmp-table .dec{font-family:var(--mono);font-size:.82rem;color:var(--text2);white-space:nowrap}
.cmp-table .ex{font-family:var(--mono);font-size:.82rem;color:var(--text2)}
.cmp-table .mono{font-family:var(--mono);font-size:.85rem}
/* sortable headers */
.cmp-table th button{all:unset;cursor:pointer;display:inline-flex;gap:.35rem;align-items:center;font:inherit;color:inherit}
.cmp-table th button:hover{color:var(--accent)}
.cmp-table th button:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
.cmp-table th[aria-sort] button::after{content:"↕";opacity:.55;font-size:.85em}
.cmp-table th[aria-sort="ascending"] button::after{content:"↑"}
.cmp-table th[aria-sort="descending"] button::after{content:"↓"}
.copy-btn{font-family:var(--mono);font-size:.8rem;line-height:1;padding:.3rem .45rem;border-radius:7px;
  border:1px solid var(--border2);background:var(--surface2);color:var(--text2);transition:.2s}
.copy-btn:hover{color:var(--accent);border-color:var(--accent)}
.copy-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.empty{color:var(--text2);padding:1.5rem;text-align:center}

/* 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)}

/* Reduced motion */
@media (prefers-reduced-motion:reduce){
  .rprog{transition:none}
  .uc-flow,.uc-live{animation:none}
  .cmp-table tbody tr{transition:none}
}

/* Responsive */
@media (max-width:640px){
  .conv-row.calc{gap:.6rem}
  .conv-row select,.conv-row input{min-width:0;flex:1 1 40%}
  #convForm .icon-btn{order:5}
  .conv-result output{font-size:1rem}
  .tbl-tools label.grow{flex-basis:100%}
}