/* EmptyCore Tools page (tools.html). Hand-written, NOT generated by the build. */
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.tools-hero{background:linear-gradient(135deg,#1B2A4A 0%,#22406F 100%)}
.tool-hub{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));margin-top:18px}
.tool-hub a{display:flex;gap:14px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:16px;text-decoration:none;color:var(--ink);transition:border-color .2s,transform .2s,box-shadow .2s}
.tool-hub a:hover{border-color:var(--orange);transform:translateY(-2px);box-shadow:0 8px 22px rgba(27,42,75,.08);color:var(--ink)}
.tool-hub .ico{flex:0 0 44px;height:44px;border-radius:12px;background:var(--navy);color:#FFB98A;display:grid;place-items:center;font-family:var(--head);font-weight:700;font-size:1.15rem}
.tool-hub b{display:block;font-family:var(--head);font-size:1.02rem;line-height:1.25}.tool-hub span.d{font-size:.86rem;color:var(--muted);line-height:1.35;display:block;margin-top:2px}
.tool-hub .grp{font-size:.7rem;text-transform:uppercase;letter-spacing:.06em;color:var(--orange-d);font-weight:700}
section.tool{padding:44px 0;scroll-margin-top:70px}
.tool-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}.tool-head p{max-width:720px}
.tool-top{white-space:nowrap;text-decoration:none;font-weight:600;margin-top:4px}
.tool-grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:20px;align-items:start}
.tool-grid.wide{grid-template-columns:1fr}
@media(max-width:820px){.tool-grid{grid-template-columns:1fr}.tool-head{flex-direction:column;gap:0}}
.tf-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:4px 16px}
.tf{margin-bottom:14px}.tf label{display:block;font-weight:600;font-size:.92rem;margin-bottom:5px}
.tf small{display:block;color:var(--muted);font-size:.8rem;margin-top:4px;line-height:1.35}
.tin{display:flex;border:1px solid #CBD3DF;border-radius:10px;background:#fff;overflow:hidden;transition:border-color .2s,box-shadow .2s}
.tin:focus-within{border-color:var(--orange);box-shadow:0 0 0 3px rgba(242,107,29,.18)}
.tin input{flex:1;min-width:0;border:0;padding:11px 12px;font:inherit;font-size:1rem;background:transparent;outline:none}
.tin select,.tin .tunit{border:0;border-left:1px solid var(--line);background:var(--soft);font:inherit;font-size:.92rem;padding:0 10px;color:var(--navy);font-weight:600;display:flex;align-items:center}
.tin select{cursor:pointer;outline:none}.tin select:focus-visible{outline:3px solid var(--orange);outline-offset:-3px}
.tsel{width:100%;padding:11px 12px;border:1px solid #CBD3DF;border-radius:10px;font:inherit;background:#fff}
.tf.given .tin{border-color:var(--navy);box-shadow:inset 3px 0 0 var(--orange)}
.btn-sm{padding:8px 14px;font-size:.9rem}
.tseg{border:0;padding:0;margin:0 0 16px;display:inline-flex;flex-wrap:wrap;gap:0;background:var(--soft);border-radius:12px;padding:4px}
.tseg label{cursor:pointer}.tseg input{position:absolute;opacity:0;pointer-events:none}
.tseg span{display:block;padding:8px 14px;border-radius:9px;font-weight:600;font-size:.92rem;color:var(--navy)}
.tseg input:checked+span{background:#fff;color:var(--orange-d);box-shadow:0 1px 4px rgba(27,42,75,.15)}
.tseg input:focus-visible+span{outline:3px solid var(--orange)}
.tool-res{background:linear-gradient(180deg,#fff, #FBFCFE)}
.tres-h{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:10px}
.tout{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;margin-bottom:12px}
.tout>p,.tout>div.full,.tout>.tr-note{grid-column:1/-1;margin:0}
.tres{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:10px 12px}
.tres span{display:block;font-size:.8rem;color:var(--muted);font-weight:600}
.tres b{display:block;font-family:var(--head);font-size:1.35rem;color:var(--ink);line-height:1.25;word-break:break-word}
.tres.hot{background:#FFF5EE;border-color:#FBD3B9}.tres.hot b{color:var(--orange-d)}
.tres.big{grid-column:1/-1}.tres.big b{font-size:1.8rem}
.tr-warn{background:#FFF1E8;border-left:4px solid var(--orange);padding:10px 12px;border-radius:8px;color:#7A3B00;font-size:.92rem}
.tr-ok{background:#E6F4EC;border-left:4px solid var(--ok);padding:10px 12px;border-radius:8px;color:#14532D;font-size:.92rem}
.tsteps{color:var(--navy);margin:0 0 12px}
.formula{background:var(--navy);color:#E8EEF8;border-radius:12px;padding:12px 14px;margin:6px 0 12px;display:flex;flex-wrap:wrap;gap:6px 14px;align-items:baseline}
.formula .flabel{width:100%;font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:#FFB98A;font-weight:700}
.formula code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.92rem;color:#fff}
.tip{font-size:.9rem;color:#334;margin:0;background:#FFF9F4;border:1px dashed #F5C7A6;border-radius:10px;padding:10px 12px}.tip b{color:var(--orange-d)}
@media(prefers-reduced-motion:reduce){.tool-hub a,.tin{transition:none}.tool-hub a:hover{transform:none}}
.tout{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}
.trows{display:grid;gap:8px;margin-bottom:12px}
.trow{display:grid;grid-template-columns:42px 1fr 40px;gap:8px;align-items:center}
.trow label{font-weight:700;font-family:var(--head);color:var(--navy)}
.trow-x{height:42px;border:1px solid var(--line);background:#fff;border-radius:10px;font-size:1.2rem;cursor:pointer;color:var(--muted)}
.trow-x:hover:not(:disabled){border-color:var(--orange);color:var(--orange-d)}.trow-x:disabled{opacity:.35;cursor:not-allowed}
.btn:disabled{opacity:.5;cursor:not-allowed}
[data-mode][hidden]{display:none!important}
.ttable{width:100%;border-collapse:collapse;font-size:.88rem;background:#fff}
.ttable th,.ttable td{padding:6px 8px;border-bottom:1px solid var(--line);text-align:left}.ttable th{background:var(--soft);font-size:.78rem;text-transform:uppercase;letter-spacing:.04em}
.ttable tr.on td{background:#FFF5EE;font-weight:700}
.tdetails{margin-top:14px}.tdetails summary{cursor:pointer;font-weight:600;color:var(--navy);padding:6px 0}
.tchips{display:flex;flex-wrap:wrap;gap:6px;margin:4px 0 14px}.tchips button{border:1px solid var(--line);background:#fff;border-radius:999px;padding:5px 11px;font:inherit;font-size:.85rem;cursor:pointer;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.tchips button:hover{border-color:var(--orange);color:var(--orange-d)}
.tin input[type=text]{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;text-transform:uppercase;letter-spacing:.05em}
/* colour code */
.cc-art{max-width:340px;margin:4px auto 10px}.cc-svg{display:block;width:100%;height:auto}
.cc-band{border:0;padding:0;margin:0 0 12px}.cc-band legend{font-weight:700;font-size:.9rem;margin-bottom:6px;padding:0}.cc-band legend b{color:var(--orange-d);font-weight:600;margin-left:4px}
.cc-sw{display:flex;flex-wrap:wrap;gap:6px}.cc-sw label{cursor:pointer;position:relative}
.cc-sw input{position:absolute;opacity:0;width:1px;height:1px}
.sw{display:inline-block;width:30px;height:30px;border-radius:8px;background:var(--c);border:1px solid rgba(15,23,42,.25);box-shadow:inset 0 -3px 0 rgba(0,0,0,.12);vertical-align:middle;transition:transform .15s}
.sw[data-c=none]{background:repeating-linear-gradient(45deg,#fff 0 5px,#E3E7EE 5px 10px)}
.sw[data-c=gold]{background:linear-gradient(135deg,#F5D76E,#B8860B)}.sw[data-c=silver]{background:linear-gradient(135deg,#F1F3F5,#9AA3AF)}
.cc-sw input:checked+.sw{outline:3px solid var(--orange);outline-offset:2px;transform:scale(1.08)}
.cc-sw input:focus-visible+.sw{outline:3px solid var(--navy);outline-offset:2px}
.cc-sw label:hover .sw{transform:scale(1.08)}
.cc-list{list-style:none;padding:0;margin:0 0 10px;display:grid;gap:6px}.cc-list li{display:flex;align-items:center;gap:10px;font-weight:600}.cc-list .sw{width:24px;height:24px}
@media(max-width:480px){.sw{width:34px;height:34px}}
@media(prefers-reduced-motion:reduce){.sw{transition:none}.cc-sw input:checked+.sw,.cc-sw label:hover .sw{transform:none}}
.ttable-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}

/* ==========================================================================
   COLOUR LAYER (27 Oct 2026) – every tool has its own accent, set inline by the build:
   --ac (accent) --ac-d (dark, text-safe) --ac-s (soft tint) --ac-m (mid tint) --ac-l (light, for navy) --ac-g (glow)
   Groups: Basics = warm (orange/pink/amber/red/coral), Timing = cool blues, Codes = violets, Power = greens.
   ========================================================================== */
.g-basics{--gc:#F26B1D;--gcd:#B44708;--gcs:#FFF2E8}
.g-timing{--gc:#0EA5E9;--gcd:#0369A1;--gcs:#E7F6FD}
.g-codes{--gc:#8B5CF6;--gcd:#6D28D9;--gcs:#F3EEFE}
.g-power{--gc:#22C55E;--gcd:#15803D;--gcs:#EAF8EF}
.tools-hero{background:radial-gradient(circle at 85% 20%,rgba(139,92,246,.35),transparent 45%),radial-gradient(circle at 10% 90%,rgba(6,182,212,.28),transparent 45%),linear-gradient(135deg,#1B2A4A 0%,#22406F 100%)}
.tools-hero::after{content:"";display:block;height:6px;margin-top:28px;background:linear-gradient(90deg,#F26B1D,#E11D74,#F59E0B,#06B6D4,#3B82F6,#8B5CF6,#D946EF,#22C55E,#14B8A6)}

/* ---- hub ---- */
.tool-key{list-style:none;padding:0;margin:14px 0 0;display:flex;flex-wrap:wrap;gap:8px}
.tool-key li{display:inline-flex;align-items:center;gap:7px;padding:5px 12px 5px 9px;border-radius:999px;background:var(--gcs);color:var(--gcd);font-weight:700;font-size:.82rem}
.tool-key li::before{content:"";width:10px;height:10px;border-radius:50%;background:var(--gc)}
.tool-hub a{position:relative;overflow:hidden;border:1px solid var(--line);border-top:4px solid var(--ac);background:linear-gradient(160deg,var(--ac-s) 0%,#fff 55%)}
.tool-hub a::after{content:"";position:absolute;right:-30px;bottom:-30px;width:90px;height:90px;border-radius:50%;background:var(--ac);opacity:.07;transition:transform .3s,opacity .3s}
.tool-hub a:hover,.tool-hub a:focus-visible{border-color:var(--ac);border-top-color:var(--ac);transform:translateY(-3px);box-shadow:0 12px 26px var(--ac-g);color:var(--ink)}
.tool-hub a:hover::after,.tool-hub a:focus-visible::after{transform:scale(1.6);opacity:.12}
.tool-hub a:focus-visible{outline:3px solid var(--ac-d);outline-offset:2px}
.tool-hub .ico{background:linear-gradient(135deg,var(--ac),var(--ac-d));color:#fff;box-shadow:0 4px 12px var(--ac-g);transition:transform .25s}
.tool-hub a:hover .ico,.tool-hub a:focus-visible .ico{transform:rotate(-8deg) scale(1.08)}
.tool-hub .grp{color:var(--ac-d)}
.tool-hub b{position:relative;z-index:1}

/* ---- each calculator section ---- */
section.tool{position:relative;background:linear-gradient(180deg,var(--ac-s) 0%,var(--bg) 60%);border-top:4px solid var(--ac)}
section.tool.alt{background:linear-gradient(180deg,#fff 0%,var(--ac-s) 100%);border-bottom:0}
.tool-title{display:flex;gap:14px;align-items:center}
.tool-ico{flex:0 0 56px;height:56px;border-radius:16px;display:grid;place-items:center;background:linear-gradient(135deg,var(--ac),var(--ac-d));color:#fff;font-family:var(--head);font-weight:700;font-size:1.5rem;box-shadow:0 6px 16px var(--ac-g)}
section.tool .eyebrow{display:inline-block;background:var(--ac-d);color:#fff;border-radius:999px;padding:3px 11px;font-size:.72rem;margin-bottom:6px}
section.tool h2{margin-bottom:.2em}
section.tool h2::after{content:"";display:block;width:64px;height:5px;border-radius:5px;margin-top:8px;background:linear-gradient(90deg,var(--ac),var(--ac-m))}
.tool-intro{max-width:760px;margin:10px 0 18px}
.tool-top{color:var(--ac-d);background:#fff;border:1px solid var(--ac-m);border-radius:999px;padding:4px 12px}.tool-top:hover{background:var(--ac-s);color:var(--ac-d)}
section.tool .card{border-radius:16px}
.tool-in{border-top:5px solid var(--ac);box-shadow:0 6px 20px rgba(27,42,75,.06)}
.tool-in h3{color:var(--ac-d)}
.tool-res{background:linear-gradient(180deg,var(--ac-s) 0%,#fff 140px);border:2px solid var(--ac-m);box-shadow:0 8px 24px var(--ac-g);transition:box-shadow .3s}
.tres-h{display:flex;align-items:center;gap:8px;color:var(--ac-d);font-weight:800}
.tres-h .live{display:inline-flex;align-items:center;gap:5px;font-size:.66rem;padding:2px 8px;border-radius:999px;background:#fff;border:1px solid var(--ac-m);color:var(--ac-d)}
.tres-h .live::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--ac);animation:tlive 1.6s ease-in-out infinite}
@keyframes tlive{50%{opacity:.25}}
.tool-res.is-live{box-shadow:0 0 0 4px var(--ac-g),0 8px 24px var(--ac-g)}
.tool-res.is-live .tres{animation:tpop .45s ease-out}
@keyframes tpop{0%{transform:scale(.97)}60%{transform:scale(1.015)}100%{transform:none}}

/* ---- result tiles: resistor-colour stripes on plain tiles, accent on the main answer ---- */
.tres{background:#fff;border:1px solid var(--line);border-top:4px solid #CBD3DF;border-radius:12px}
.tout>.tres:nth-child(6n+1){border-top-color:#D32F2F}.tout>.tres:nth-child(6n+2){border-top-color:#F57C00}.tout>.tres:nth-child(6n+3){border-top-color:#E0A800}
.tout>.tres:nth-child(6n+4){border-top-color:#2E7D32}.tout>.tres:nth-child(6n+5){border-top-color:#1565C0}.tout>.tres:nth-child(6n){border-top-color:#7B1FA2}
.tres.hot{background:var(--ac-s);border-color:var(--ac-m);border-top-color:var(--ac)}.tres.hot b{color:var(--ac-d)}
.tres.hot span{color:var(--ac-d)}
.tres.hot.big{background:linear-gradient(135deg,var(--ac-d),#1B2A4A 160%);border-color:var(--ac-d);color:#fff;position:relative;overflow:hidden}
.tres.hot.big::after{content:"";position:absolute;right:-20px;top:-20px;width:90px;height:90px;border-radius:50%;background:rgba(255,255,255,.12)}
.tres.hot.big span{color:rgba(255,255,255,.88)}.tres.hot.big b{color:#fff}
.tsteps{background:#fff;border:1px dashed var(--ac-m);border-radius:10px;padding:8px 10px}.tsteps:empty{display:none}
.tsteps b{color:var(--ac-d)}

/* ---- inputs ---- */
.tf label{color:var(--navy)}
.tf label::before{content:"";display:inline-block;width:8px;height:8px;border-radius:3px;background:var(--ac);margin-right:7px;vertical-align:1px}
.tin{border:1.5px solid #CBD3DF}
.tin:focus-within{border-color:var(--ac);box-shadow:0 0 0 4px var(--ac-g)}
.tin select,.tin .tunit{border-left:0;margin:4px;border-radius:8px;background:var(--ac-s);color:var(--ac-d);font-weight:700;padding:0 10px}
.tin select:hover{box-shadow:inset 0 0 0 1.5px var(--ac-m)}
.tin select:focus-visible{outline:3px solid var(--ac-d);outline-offset:0}
.tsel{border:1.5px solid #CBD3DF}.tsel:focus-visible{outline:3px solid var(--ac-d);outline-offset:1px;border-color:var(--ac)}
.tf.given .tin{border-color:var(--ac);box-shadow:inset 4px 0 0 var(--ac);background:var(--ac-s)}
.tseg{background:var(--ac-s);border:1px solid var(--ac-m)}
.tseg input:checked+span{background:var(--ac-d);color:#fff;box-shadow:0 3px 10px var(--ac-g)}
.tseg input:focus-visible+span{outline:3px solid var(--ac-d);outline-offset:2px}
.tchips button{border-color:var(--ac-m);background:#fff;color:var(--ac-d);font-weight:600}
.tchips button:hover,.tchips button:focus-visible{background:var(--ac-s);border-color:var(--ac);color:var(--ac-d)}
section.tool .btn-ghost{border-color:var(--ac-m);color:var(--ac-d)}section.tool .btn-ghost:hover{background:var(--ac-s);border-color:var(--ac)}
/* series/parallel rows: R1, R2… labels painted like colour-code bands */
.trow label{display:grid;place-items:center;height:38px;border-radius:10px;color:#fff;font-size:.9rem;background:#7B3F00}
.trow:nth-child(9n+2) label{background:#D32F2F}.trow:nth-child(9n+3) label{background:#C65A00}.trow:nth-child(9n+4) label{background:#9A7400}
.trow:nth-child(9n+5) label{background:#2E7D32}.trow:nth-child(9n+6) label{background:#1565C0}.trow:nth-child(9n+7) label{background:#7B1FA2}
.trow:nth-child(9n+8) label{background:#5F6670}.trow:nth-child(9n) label{background:#111}
.trow-x:hover:not(:disabled){border-color:var(--ac);color:var(--ac-d)}

/* ---- formula + tip ---- */
.formula{border-left:6px solid var(--ac);background:linear-gradient(135deg,#1B2A4A,#22355C)}
.formula .flabel{color:var(--ac-l)}
.formula code{background:rgba(255,255,255,.07);padding:2px 7px;border-radius:6px}
.tip{background:var(--ac-s);border:1.5px dashed var(--ac-m)}.tip b{color:var(--ac-d)}
.tr-warn{background:#FFF1E8}

/* ---- live pictures (assets/js/tools/viz.js) ---- */
.tviz:empty{display:none}
.tviz{background:#fff;border:1px solid var(--ac-m);border-radius:14px;padding:10px 12px 8px;margin-bottom:12px}
.tviz svg{display:block;width:100%;height:auto;max-width:360px;margin:0 auto}
.viz-cap{margin:4px 0 0;text-align:center;font-size:.84rem;color:var(--muted);font-weight:600}
.viz-cap b{color:var(--ac-d)}
.v-t{font:600 11px var(--font);fill:#334155;text-anchor:middle}.v-t.sm{font-size:10px}.v-t.lft{text-anchor:start}.v-t.big{font:700 18px var(--head);fill:var(--ac-d)}
/* Ohm triad: V orange, I blue, R green */
.ohm-tri polygon{stroke:#fff;stroke-width:3;transition:fill .3s}
.o-v{fill:#FDD9C2}.o-v.given{fill:#F9A66C}.o-v.solved{fill:#E2570B}
.o-i{fill:#CFE0FB}.o-i.given{fill:#8AB4F8}.o-i.solved{fill:#1D5FD6}
.o-r{fill:#CDEFD8}.o-r.given{fill:#7FD39C}.o-r.solved{fill:#15803D}
.o-l{font:800 22px var(--head);text-anchor:middle;fill:#1B2A4A}.o-n{font:700 12px var(--font);text-anchor:middle;fill:#1B2A4A}
.o-l.solved,.o-n.solved{fill:#fff}
.o-x{fill:#fff;stroke:#CBD3DF}.o-xt{font:700 16px var(--font);text-anchor:middle;fill:#1B2A4A}
.viz-heat{display:grid;gap:4px;margin-top:6px}.vh-lab{font-size:.84rem;color:#334155}.vh-lab b{color:#B45309}
.vh-bar{height:10px;border-radius:99px;background:#EEF2F8;overflow:hidden}.vh-bar i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,#22C55E,#F59E0B 55%,#EF4444);transition:width .4s}
.viz-cap .k{display:inline-block;width:10px;height:10px;border-radius:3px;margin:0 4px 0 10px;vertical-align:-1px}.k.given{background:#F9A66C}.k.solved{background:#E2570B}
/* LED */
.viz-led{background:radial-gradient(ellipse at 55% 40%,#1E2C4F,#0F172A);border-radius:12px;padding:6px 6px 4px;margin:-4px -6px 0}
.viz-led .viz-cap{color:#E2E8F0}.viz-led .v-t{fill:#CBD5E1}
.l-over{animation:lover .5s steps(2) infinite}@keyframes lover{50%{opacity:.4}}
/* divider */
.vd-bar{display:flex;border-radius:12px;overflow:hidden;min-height:46px;font-size:.82rem;font-weight:600}
.vd-bar i{font-style:normal}.vd-bar span{display:flex;align-items:center;justify-content:center;padding:4px 8px;text-align:center;min-width:72px;transition:flex .4s}
.vd-r1{background:#FDE2E2;color:#7F1D1D}.vd-r2{background:linear-gradient(135deg,var(--ac),var(--ac-d));color:#fff}
/* RC */
.rc-a{fill:var(--ac-g)}.rc-c{fill:none;stroke:var(--ac-d);stroke-width:3;stroke-linecap:round}
.rc-ax{stroke:#94A3B8;stroke-width:1.5}.rc-g{stroke:var(--ac-m);stroke-dasharray:3 3}.rc-d{fill:#fff;stroke:var(--ac-d);stroke-width:2.5}
/* battery */
.bat{position:relative;height:46px;border:3px solid #1B2A4A;border-radius:10px;padding:3px;margin-right:12px;background:#fff}
.bat::after{content:"";position:absolute;right:-11px;top:12px;width:7px;height:16px;border-radius:0 4px 4px 0;background:#1B2A4A}
.bat i{display:block;height:100%;border-radius:6px;background:linear-gradient(90deg,#16A34A,#4ADE80);background-size:200% 100%;transition:width .4s}
.bat.mid i{background:linear-gradient(90deg,#D97706,#FBBF24)}.bat.lo i{background:linear-gradient(90deg,#DC2626,#F87171)}
.bat b{position:absolute;inset:0;display:grid;place-items:center;font-family:var(--head);font-size:1.1rem;color:#0F172A;text-shadow:0 0 6px #fff,0 0 2px #fff}
.bat-scale{position:relative;height:8px;margin:12px 4px 2px;border-radius:99px;background:linear-gradient(90deg,#EF4444,#F59E0B 35%,#22C55E 70%,#14B8A6)}
.bat-pin{position:absolute;top:-5px;width:18px;height:18px;margin-left:-9px;border-radius:50%;background:#fff;border:4px solid #1B2A4A;transition:left .4s}
.bat-ticks{display:flex;justify-content:space-between;font-size:.7rem;color:var(--muted);font-weight:600}
/* 555 */
.viz-555{display:grid;grid-template-columns:54px 1fr;gap:6px 12px;align-items:center}.viz-555 .viz-cap{grid-column:1/-1}
.p-led{width:46px;height:46px;border-radius:50%;background:radial-gradient(circle at 35% 35%,#FCA5A5,#7F1D1D);border:3px solid #E2E8F0;transition:background .08s,box-shadow .08s}
.p-led.on{background:radial-gradient(circle at 35% 35%,#FFF,#FF3B30 45%,#B91C1C);box-shadow:0 0 18px 6px rgba(255,59,48,.55)}
.p-led.steady.on{opacity:.85}
.w555{fill:none;stroke:var(--ac-d);stroke-width:3;stroke-linejoin:round}
/* chips (cap disc, SMD) */
.cap-disc{fill:#E8873A;stroke:#B35A17;stroke-width:3}.cap-disc.bad{fill:#CBD5E1;stroke:#94A3B8}
.smd-body{fill:#1F2937}.smd-body.bad{fill:#64748B}
.chip-t{font:700 30px ui-monospace,SFMono-Regular,Menlo,monospace;text-anchor:middle;fill:#1F2937;letter-spacing:1px}.smd-t{fill:#F8FAFC;font-size:28px}
/* wire */
.w-ins{fill:var(--ac);opacity:.85}.w-ref{fill:none;stroke:#94A3B8;stroke-dasharray:4 4}

@media(max-width:480px){.tool-ico{flex-basis:46px;height:46px;font-size:1.25rem;border-radius:13px}.tool-title{gap:10px}.vd-bar{font-size:.74rem}.vd-bar span{min-width:60px}}
@media(prefers-reduced-motion:reduce){
 .tool-hub a,.tool-hub a::after,.tool-hub .ico,.tool-res,.bat i,.bat-pin,.vh-bar i,.vd-bar span,.p-led,.ohm-tri polygon{transition:none}
 .tool-hub a:hover,.tool-hub a:focus-visible{transform:none}.tool-hub a:hover .ico,.tool-hub a:focus-visible .ico{transform:none}
 .tres-h .live::before,.l-over{animation:none}.tool-res.is-live .tres{animation:none}
}
section.tool .eyebrow::after{display:none}

/* LED series / parallel diagram */
.viz-lsp svg{max-width:420px}
.lsp-w{stroke:#9AA3AF;stroke-width:2;fill:none}
.lsp-rail{stroke-width:4;stroke-linecap:round;fill:none}.lsp-rail.p{stroke:#F472B6}.lsp-rail.n{stroke:#64748B}
@media(prefers-reduced-motion:reduce){.l-over{animation:none}}

/* ---- multi-page Tools (27 Oct 2026): hub groups, per-tool page hero, back / prev-next ---- */
.nav ul a[aria-current=true]{color:var(--orange-d);background:#FFF1E8}
.tool-key li{padding:0;background:none}.tool-key li::before{display:none}
.tool-key a{display:inline-flex;align-items:center;gap:7px;padding:5px 12px 5px 9px;border-radius:999px;background:var(--gcs);color:var(--gcd);font-weight:700;font-size:.82rem;text-decoration:none}
.tool-key a::before{content:"";width:10px;height:10px;border-radius:50%;background:var(--gc)}
.tool-key a:hover,.tool-key a:focus-visible{background:var(--gc);color:#fff}
.hub-group{margin-top:34px;scroll-margin-top:90px}
.hub-h{display:flex;align-items:center;gap:10px;font-size:1.35rem;margin:0}
.hub-h i{width:14px;height:14px;border-radius:50%;background:var(--gc);box-shadow:0 0 0 4px var(--gcs)}
.small-h{font-size:1.05rem;margin-top:28px}
.tool-hub .go{display:inline-block;margin-top:8px;font-size:.82rem;font-weight:700;color:var(--ac-d);position:relative;z-index:1}
.tool-hub a:hover .go,.tool-hub a:focus-visible .go{text-decoration:underline}
.tool-hub a.was-here{box-shadow:0 0 0 3px var(--ac-m),0 12px 26px var(--ac-g)}
/* per-tool hero */
.tool-hero{padding:28px 0 0;background:radial-gradient(circle at 88% 15%,var(--ac-g),transparent 50%),radial-gradient(circle at 8% 95%,rgba(255,255,255,.08),transparent 45%),linear-gradient(135deg,#1B2A4A 0%,#22406F 100%)}
.tool-hero::after{background:linear-gradient(90deg,var(--ac),var(--ac-l),var(--ac))}
.tool-hero .eyebrow{color:var(--ac-l)}
.tool-hero h1{margin:.1em 0 .3em}
.tool-hero-row{display:flex;gap:16px;align-items:center;margin-top:18px}
.tool-hero-ico{flex:0 0 64px;height:64px;border-radius:18px;display:grid;place-items:center;background:linear-gradient(135deg,var(--ac),var(--ac-d));color:#fff;font-family:var(--head);font-weight:700;font-size:1.7rem;box-shadow:0 8px 22px var(--ac-g),inset 0 0 0 2px rgba(255,255,255,.25)}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;padding:0;margin:0 0 14px;color:#B9C6DC}
.crumbs li+li::before{content:"›";margin-right:6px;opacity:.7}
.crumbs a{color:#fff;text-decoration:none;border-bottom:1px dashed rgba(255,255,255,.4)}.crumbs a:hover{border-bottom-style:solid}
.crumbs [aria-current]{color:var(--ac-l);font-weight:600}
.back-hub{border-color:var(--ac-l);color:#fff}.back-hub:hover,.back-hub:focus-visible{background:var(--ac-l);border-color:var(--ac-l);color:var(--navy)}
@media(max-width:600px){.tool-hero-row{align-items:flex-start}.tool-hero-ico{flex-basis:48px;height:48px;font-size:1.3rem;border-radius:14px}}
/* FAQ + more tools */
.tool-faq .faq{max-width:860px}
.tool-pn{display:grid;grid-template-columns:1fr auto 1fr;gap:12px;margin-top:16px}
.tool-pn .pn{display:flex;flex-direction:column;gap:2px;padding:14px 16px;border-radius:14px;border:1px solid var(--line);border-left:5px solid var(--ac,var(--navy));background:linear-gradient(160deg,var(--ac-s,#F4F7FB),#fff 70%);text-decoration:none;color:var(--ink);transition:transform .2s,box-shadow .2s}
.tool-pn .next{text-align:right;border-left-width:1px;border-right:5px solid var(--ac)}
.tool-pn .hubbtn{text-align:center;background:var(--navy);border-color:var(--navy);color:#fff}.tool-pn .hubbtn .muted{color:#B9C6DC}
.tool-pn .pn:hover,.tool-pn .pn:focus-visible{transform:translateY(-2px);box-shadow:0 10px 22px var(--ac-g,rgba(27,42,75,.15))}
.tool-pn b{font-family:var(--head)}
@media(max-width:700px){.tool-pn{grid-template-columns:1fr 1fr}.tool-pn .hubbtn{grid-column:1/-1;order:-1}}
.tool-all{margin-top:24px}.tool-all summary{cursor:pointer;font-weight:700;color:var(--navy)}
@media(prefers-reduced-motion:reduce){.tool-pn .pn{transition:none}.tool-pn .pn:hover,.tool-pn .pn:focus-visible{transform:none}}