/* ============ eCircuitCalc — Resistor Color Code guide ============ */
/* Reuses base.css tokens; only page-specific rules here. */

/* 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{padding-bottom:3rem}
.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}
code{font-family:var(--mono);font-size:.86em;background:var(--surface2);border:1px solid var(--border);
  padding:.1em .4em;border-radius:6px;color:var(--text)}
.muted{color:var(--text2);font-size:.9rem}

/* 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)}

/* 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:last-child{margin-bottom:0}
.callout.warn{border-left-color:#fbbf24}

/* Figure + circuit */
.fig{margin:1.6rem 0;padding:1.2rem;border-radius:16px;background:var(--bg2);border:1px solid var(--border)}
.fig-svg{width:100%;height:auto;max-width:560px;margin:0 auto;display:block}
.fig figcaption{color:var(--text2);font-size:.85rem;text-align:center;margin-top:.8rem}
.f-wire{fill:none;stroke:var(--wbase);stroke-width:2.4;stroke-linecap:round}
.f-comp{fill:none;stroke:var(--cw);stroke-width:2.6;stroke-linecap:round}
.f-lbl{fill:var(--text);font-family:var(--mono);font-size:15px}
.f-node{fill:var(--cw)}
.f-body{fill:#d9c194;stroke:var(--border2);stroke-width:1.5}
.f-led{fill:#22c55e;stroke:#4ade80;stroke-width:1.5;stroke-linejoin:round}
.f-arr{fill:none;stroke:var(--cw);stroke-width:1.6;stroke-linecap:round}
.f-flow{fill:none;stroke:var(--accent);stroke-width:3;stroke-linecap:round;
  stroke-dasharray:10 16;opacity:.85;animation:rcflow 1s linear infinite}
@keyframes rcflow{to{stroke-dashoffset:-26}}
@media (prefers-reduced-motion:reduce){.f-flow{animation:none;opacity:.5}}

/* Color swatches */
.sw{display:inline-block;width:22px;height:22px;border-radius:6px;border:1px solid var(--border2);vertical-align:middle}
.sw-none{background:transparent;border-style:dashed}
.sw-black{background:#101014}.sw-brown{background:#7a4a12}.sw-red{background:#d23b2e}
.sw-orange{background:#f08000}.sw-yellow{background:#f2c200}.sw-green{background:#2f9e44}
.sw-blue{background:#1c6fd6}.sw-violet{background:#8e24aa}.sw-grey{background:#9aa0a6}
.sw-white{background:#f3f3f3}
.sw-gold{background:linear-gradient(180deg,#e8c65a,#c39a2e)}
.sw-silver{background:linear-gradient(180deg,#ececec,#a7adb4)}

/* Tables */
.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:14px;background:var(--surface);margin:1rem 0}
table.cc-table{width:100%;border-collapse:collapse;min-width:560px}
.cc-table.small{min-width:520px}
.cc-table caption{caption-side:top;text-align:left;padding:.9rem 1.1rem .2rem;font-family:var(--mono);
  font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--text2)}
.cc-table th,.cc-table td{padding:.7rem 1rem;text-align:left;border-bottom:1px solid var(--border);font-size:.92rem}
.cc-table thead th{font-family:var(--mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--text2);background:var(--surface2)}
.cc-table .num{text-align:right;font-family:var(--mono)}
.cc-table tbody tr:hover{background:var(--surface2)}
.cc-table tbody tr:last-child td{border-bottom:0}

/* Quick-ref cards */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin:1rem 0}
.qrc{padding:1.2rem}
.qrc h3{margin:0 0 .5rem}
.qrc code{display:block;margin:.4rem 0}
.qrc p{margin:0;font-size:.85rem}
@media (max-width:720px){.grid-3{grid-template-columns:1fr}}

/* Band diagrams */
.band-diagram{display:flex;gap:.5rem;flex-wrap:wrap;margin:1rem 0;padding:1rem;border-radius:14px;
  background:var(--bg2);border:1px solid var(--border)}
.band-diagram .bd{flex:1;min-width:96px;display:flex;flex-direction:column;align-items:center;gap:.4rem;
  background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:.7rem .5rem}
.band-diagram .bd-sw{width:100%;height:34px;border-radius:6px;border:1px solid var(--border2)}
.band-diagram .bd-n{font-weight:600;font-size:.85rem}
.band-diagram .bd-r{font-family:var(--mono);font-size:.72rem;color:var(--text2)}

/* Formula */
.formula{display:flex;gap:1rem;flex-wrap:wrap;margin:1rem 0}
.formula>div{flex:1;min-width:160px;display:flex;flex-direction:column;gap:.3rem;
  background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:.9rem 1.1rem}
.formula span{font-family:var(--mono);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--text2)}
.formula.big{justify-content:center}
.formula.big code{font-size:1.3rem;background:none;border:0;padding:0}

/* TCR calc */
.tcr-calc,.decoder{padding:1.4rem;border-radius:16px;background:var(--surface);border:1px solid var(--border)}
.tcr-calc h3,.reverse h3{margin-top:0}
.tcr-grid,.rv-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:1rem}
.tcr-calc label,.rv-grid label{display:flex;flex-direction:column;gap:.4rem;font-size:.85rem;font-weight:600}
.tcr-calc input,.rv-grid input,.rv-grid select,.tcr-grid input{width:100%;padding:.6rem .8rem;border-radius:10px;
  border:1px solid var(--border2);background:var(--bg);color:var(--text);font:inherit}
.tcr-calc input:focus,.rv-grid input:focus,.rv-grid select:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 3px var(--glow)}
.inline-units{display:flex;gap:.4rem}
.inline-units select{width:auto;min-width:64px}
.tcr-out{margin-top:1rem;display:grid;gap:.4rem}
.tcr-out .row{display:flex;justify-content:space-between;gap:1rem;border-bottom:1px dashed var(--border);padding-bottom:.4rem}
.tcr-out .row b{font-family:var(--mono)}
.tcr-out .final{color:var(--accent);font-weight:700}

/* Decoder */
.seg{display:inline-flex;border:1px solid var(--border2);border-radius:12px;overflow:hidden}
.seg-btn{padding:.6rem 1.1rem;font-weight:600;color:var(--text2);transition:.2s}
.seg-btn:hover{color:var(--text)}
.seg-btn.active{background:var(--grad);color:#fff}
.band-selectors{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:1rem;margin-top:1.2rem}
.band-field label{display:block;font-size:.8rem;font-weight:600;margin-bottom:.4rem}
.csel{position:relative}
.csel select{width:100%;padding:.6rem .8rem .6rem 2.1rem;border-radius:10px;border:1px solid var(--border2);
  background:var(--bg);color:var(--text);font:inherit;appearance:none}
.csel select:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 3px var(--glow)}
.cdot{position:absolute;left:.6rem;top:50%;transform:translateY(-50%);width:16px;height:16px;border-radius:5px;
  border:1px solid var(--border2);pointer-events:none;z-index:1}
.dec-viz{margin:1.4rem 0;text-align:center}
.rz{width:100%;max-width:420px;margin:0 auto;display:block}
.rz-lead{stroke:var(--cw);stroke-width:5;stroke-linecap:round}
.rz-body{stroke:var(--border2);stroke-width:1.5;filter:drop-shadow(0 6px 14px rgba(0,0,0,.35))}
.band-readout{font-family:var(--mono);font-size:.82rem;color:var(--text2);text-align:center;
  background:var(--bg2);border:1px solid var(--border);border-radius:10px;padding:.7rem 1rem;margin-bottom:1rem}
.dec-result{display:grid;gap:.6rem}
.dr-hero{display:flex;align-items:baseline;gap:.6rem;flex-wrap:wrap}
.dr-hero .val{font-size:clamp(1.8rem,5vw,2.6rem);font-weight:800;font-family:var(--mono);
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.dr-hero .tol{font-family:var(--mono);font-size:1.1rem;color:var(--accent)}
.dr-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:.7rem}
.dr-cell{background:var(--bg2);border:1px solid var(--border);border-radius:10px;padding:.7rem .9rem}
.dr-cell span{display:block;font-family:var(--mono);font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;color:var(--text2)}
.dr-cell b{font-family:var(--mono);font-size:1rem}
.dec-error{margin-top:1rem;color:#f87171;background:rgba(248,113,113,.1);border:1px solid rgba(248,113,113,.4);
  border-radius:10px;padding:.8rem 1rem;font-size:.9rem}
.reverse .rv-out{margin-top:1rem;display:grid;gap:.6rem}
.rv-bands{display:flex;gap:.5rem;flex-wrap:wrap}
.rv-band{display:flex;flex-direction:column;align-items:center;gap:.3rem;background:var(--bg2);
  border:1px solid var(--border);border-radius:10px;padding:.6rem .7rem;min-width:82px}
.rv-band .sw{width:26px;height:26px}
.rv-band b{font-size:.82rem}
.rv-band small{font-family:var(--mono);font-size:.68rem;color:var(--text2)}
.rv-note{font-size:.88rem;color:var(--text2)}
.rv-note.warn{color:#fbbf24}
.rv-value{font-family:var(--mono);font-size:1.2rem;font-weight:700}

/* Practice / FAQ accordion (scoped; not loaded on this page by styles.css) */
.faq{display:grid;gap:.7rem;margin:1rem 0}
.faq-item{background:var(--surface);border:1px solid var(--border);border-radius:12px;overflow:hidden;transition:border-color .3s}
.faq-item.open{border-color:var(--accent)}
.faq-q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:1rem;
  padding:1rem 1.2rem;font-weight:600;font-size:.98rem;text-align:left}
.faq-x{position:relative;width:15px;height:15px;flex:none}
.faq-x::before,.faq-x::after{content:"";position:absolute;background:var(--accent);border-radius:2px;top:50%;left:50%;transition:transform .3s}
.faq-x::before{width:13px;height:2px;transform:translate(-50%,-50%)}
.faq-x::after{width:2px;height:13px;transform:translate(-50%,-50%)}
.faq-item.open .faq-x::after{transform:translate(-50%,-50%) scaleY(0)}
.faq-a{display:grid;grid-template-rows:0fr;transition:grid-template-rows .4s var(--ease)}
.faq-item.open .faq-a{grid-template-rows:1fr}
.faq-a>div{overflow:hidden}
.faq-a p{padding:0 1.2rem 1.1rem;margin:0}

/* Cheat sheet */
.cheat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem}
.cheat-grid .card{padding:1.1rem}
.cheat-grid h3{margin:0 0 .4rem;font-size:.95rem}
.cheat-grid p{margin:0;font-size:.82rem}
ul.tick li{list-style:none;position:relative;padding-left:1.4rem}
ul.tick li::before{content:"✕";position:absolute;left:0;color:#f87171;font-weight:700}

/* Ad slot (page-scoped; layout.js toggles .ad-hidden) */
.ad-slot{max-width:728px;margin:2.4rem auto;text-align:center;overflow:hidden;
  transition:max-height .5s var(--ease),opacity .4s,margin .5s;max-height:160px}
.ad-slot.ad-hidden{max-height:0;opacity:0;margin:0}
.ad-label{display:block;font-family:var(--mono);font-size:.62rem;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)}