/* ============ Final pages: extra components on top of site.css ============ */
:root{
  --and:#10609F; --or:#5B3BB8; --add:#0F7A4B; --less:#B5541C;
  --stage-if:#10609F; --stage-id:#5B3BB8; --stage-ex:#0F7A4B; --stage-mem:#9A6414; --stage-wb:#B32D2D;
  --wire:#3E4C5B; --wire-dim:#C3CDD8; --hot:#E0531F; --ctrlw:#D9731A;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --and:#5FB4F2; --or:#AE92F7; --add:#46CC8C; --less:#F09A5B;
    --stage-if:#5FB4F2; --stage-id:#AE92F7; --stage-ex:#46CC8C; --stage-mem:#EAB459; --stage-wb:#FF837A;
    --wire:#B5C3D1; --wire-dim:#33414E; --hot:#FF8A57; --ctrlw:#F0A04B;
  }
}
:root[data-theme="dark"]{
  --and:#5FB4F2; --or:#AE92F7; --add:#46CC8C; --less:#F09A5B;
  --stage-if:#5FB4F2; --stage-id:#AE92F7; --stage-ex:#46CC8C; --stage-mem:#EAB459; --stage-wb:#FF837A;
  --wire:#B5C3D1; --wire-dim:#33414E; --hot:#FF8A57; --ctrlw:#F0A04B;
}

/* ---------- learn / background dropdown ---------- */
details.learn{border:1px solid var(--line);border-radius:14px;background:var(--surface);box-shadow:var(--shadow);margin:0 0 16px;overflow:hidden}
details.learn>summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:12px;padding:13px 16px;font-family:'Chakra Petch',sans-serif;font-weight:600;font-size:15.5px}
details.learn>summary::-webkit-details-marker{display:none}
details.learn>summary .ico{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;background:var(--data-soft);color:var(--data);flex:none}
details.learn>summary .ico svg{width:17px;height:17px}
details.learn>summary .hint{margin-left:auto;font-family:'IBM Plex Sans Thai',sans-serif;font-weight:400;font-size:12.5px;color:var(--ink-3);text-align:right}
details.learn>summary .tw{width:12px;height:12px;flex:none;color:var(--ink-3);transition:transform .2s}
details.learn[open]>summary .tw{transform:rotate(180deg)}
details.learn[open]>summary{border-bottom:1px solid var(--line);background:var(--surface-2)}
details.learn .learn-body{padding:16px 20px 20px}
details.learn .learn-body > :first-child{margin-top:0}
details.learn .learn-body h4{font-size:15.5px;margin:20px 0 8px;color:var(--ink)}
details.learn .learn-body p{margin:8px 0}
details.learn.method>summary .ico{background:var(--cs-soft);color:var(--cs)}
details.learn.memo>summary .ico{background:var(--ctrl-soft);color:var(--ctrl)}
details.learn.key>summary .ico{background:var(--addr-soft);color:var(--addr)}

/* ---------- numbered method steps ---------- */
.steps{counter-reset:st;list-style:none;padding:0;margin:10px 0}
.steps>li{counter-increment:st;position:relative;padding:2px 0 10px 40px;margin:0}
.steps>li::before{content:counter(st);position:absolute;left:0;top:1px;width:27px;height:27px;border-radius:8px;background:var(--cs);color:#fff;display:grid;place-items:center;font-family:'IBM Plex Mono',monospace;font-size:13px;font-weight:600}
.steps>li b:first-child{color:var(--ink)}

/* ---------- generator lab ---------- */
.gen-head{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between;margin-bottom:12px}
.gen-ctrls{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.gen-ctrls .lbl{font-family:'Chakra Petch',sans-serif;font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3);margin-right:2px}
.btn svg{display:inline-block;width:15px;height:15px;vertical-align:-3px;margin-right:6px}
.btn.ghost{background:transparent}
.btn.sm{font-size:12.5px;padding:5px 10px;border-radius:8px}
.btn.ok{background:var(--addr);border-color:var(--addr);color:#fff}
.btn.ok:hover{filter:brightness(1.08);background:var(--addr)}
.score{font-family:'Chakra Petch',sans-serif;font-weight:700;font-size:14px;padding:4px 12px;border-radius:20px;background:var(--sunken);border:1px solid var(--line)}
.score.good{color:var(--ok);border-color:var(--ok);background:var(--addr-soft)}
.score.mid{color:var(--warn);border-color:var(--warn);background:var(--boot-soft)}
.score.low{color:var(--bad);border-color:var(--bad);background:var(--ctrl-soft)}
.variant-note{font-size:13.5px;color:var(--ink-2);background:var(--boot-soft);border:1px dashed var(--boot);border-radius:10px;padding:9px 13px;margin:0 0 12px}
.variant-note b{color:var(--boot)}

/* input cells inside answer tables */
.qt td{vertical-align:middle}
.qt .mono{white-space:nowrap}
.qt select,.qt input[type=text]{font-family:'IBM Plex Mono',monospace;font-size:14px;padding:5px 7px;border-radius:7px;width:auto;min-width:56px;background:var(--surface);border:1px solid var(--line);color:var(--ink)}
.qt input[type=text]{width:100%;min-width:90px;max-width:150px}
.qt td.res-ok select,.qt td.res-ok input{border-color:var(--ok);background:var(--addr-soft)}
.qt td.res-bad select,.qt td.res-bad input{border-color:var(--bad);background:var(--ctrl-soft)}
.qt td.res-warn select,.qt td.res-warn input{border-color:var(--warn);background:var(--boot-soft)}
.qt .keyv{display:block;font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--ok);margin-top:3px;white-space:nowrap}
.qt tr.sel td{background:color-mix(in srgb,var(--cs) 9%,transparent)}
.qt tr.sel td:first-child{box-shadow:inset 3px 0 0 var(--cs)}
.qt .why{border:1px solid var(--line);background:var(--surface-2);color:var(--cs);border-radius:7px;font-family:'Chakra Petch',sans-serif;font-weight:600;font-size:12.5px;padding:4px 9px;cursor:pointer;white-space:nowrap}
.qt .why:hover{border-color:var(--cs)}
.qt th.grp{text-align:center;border-bottom:1px solid var(--line)}
.mark{display:inline-grid;place-items:center;width:22px;height:22px;border-radius:50%;font-size:12px;font-weight:700;color:#fff;vertical-align:middle}
.mark.ok{background:var(--ok)} .mark.bad{background:var(--bad)} .mark.warn{background:var(--warn)}

/* explanation panel */
.explain{margin-top:14px;border:1px solid var(--line);border-radius:13px;background:var(--surface-2);padding:14px 16px}
.explain>.ex-title{font-family:'Chakra Petch',sans-serif;font-weight:700;font-size:15px;margin:0 0 8px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.explain .tint{background:var(--tintbg,var(--cs-soft))}
.explain ol.steps>li{padding-bottom:12px}
.fadein{animation:fadeIn .35s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}

/* column addition */
.colsum{display:grid;width:max-content;grid-auto-flow:column;gap:0;font-family:'IBM Plex Mono',monospace;font-size:17px;line-height:1.5;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:10px 14px;margin:8px 0;overflow-x:auto;max-width:100%}
.colsum .col{display:grid;grid-template-rows:auto auto auto auto auto;text-align:center;min-width:24px;opacity:0;animation:colIn .35s ease forwards;animation-delay:calc(var(--i) * .16s)}
.colsum .col.lbls{opacity:1;animation:none;text-align:right;padding-right:12px;color:var(--ink-3);font-size:12.5px;font-family:'Chakra Petch',sans-serif;align-items:center}
.colsum .col span{display:block;height:26px;line-height:26px}
.colsum .col.lbls span{display:flex;align-items:center;justify-content:flex-end}
.colsum .c{color:var(--ctrl);font-size:13px}
.colsum .c.zero{color:var(--ink-3);opacity:.55}
.colsum .r{border-top:2px solid var(--ink);font-weight:600;color:var(--addr)}
.colsum .r.cout{color:var(--ink-3);text-decoration:line-through}
.colsum .msb{background:color-mix(in srgb,var(--boot) 16%,transparent);border-radius:5px}
@keyframes colIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion: reduce){.colsum .col{opacity:1;animation:none}}

.interp{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:8px;margin:8px 0}
.interp>div{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:8px 11px}
.interp .k{font-family:'Chakra Petch',sans-serif;font-size:11.5px;font-weight:700;letter-spacing:.08em;color:var(--ink-3);text-transform:uppercase}
.interp .v{font-family:'IBM Plex Mono',monospace;font-size:15px;font-weight:500}
.interp .on{border-color:var(--cs);box-shadow:inset 0 0 0 1px var(--cs)}
.verdict{display:inline-flex;align-items:center;gap:8px;font-family:'Chakra Petch',sans-serif;font-weight:700;font-size:15px;padding:5px 12px;border-radius:9px}
.verdict.t{background:var(--ctrl-soft);color:var(--bad)}
.verdict.f{background:var(--addr-soft);color:var(--ok)}

/* wheel */
.wheelbox{display:grid;grid-template-columns:minmax(0,340px) 1fr;gap:18px;align-items:center}
@media(max-width:760px){.wheelbox{grid-template-columns:1fr}}
.wheel text{font-family:'IBM Plex Mono',monospace}

/* multiple choice */
.choices{display:flex;flex-wrap:wrap;gap:7px;margin:10px 0}
.choice{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:9px;padding:7px 12px;font:inherit;font-size:14px;cursor:pointer;transition:border-color .15s,background .15s}
.choice:hover{border-color:var(--cs)}
.choice.right{border-color:var(--ok);background:var(--addr-soft);color:var(--ok);font-weight:600}
.choice.wrong{border-color:var(--bad);background:var(--ctrl-soft);color:var(--bad);text-decoration:line-through}
.choice[disabled]{cursor:default}
.qcard{background:var(--surface);border:1px solid var(--line);border-radius:13px;padding:14px 16px;margin:0 0 12px}
.qcard .qno{font-family:'IBM Plex Mono',monospace;font-weight:600;font-size:13px;color:#fff;background:var(--acc,var(--cs));border-radius:7px;padding:2px 9px;margin-right:8px}
.qcard p{margin:6px 0}

/* svg diagrams */
.diagram{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:8px;margin:12px 0;overflow-x:auto}
.diagram svg{min-width:560px;width:100%;height:auto}
.diagram.wide svg{min-width:760px}
.diagram text{font-family:'IBM Plex Sans Thai','Chakra Petch',sans-serif}
.diagram .mono, .diagram text.mono{font-family:'IBM Plex Mono',monospace}
.w{fill:none;stroke:var(--wire);stroke-width:2;stroke-linejoin:round;stroke-linecap:round;transition:stroke .25s,stroke-width .25s,opacity .25s}
.w.ctl{stroke:var(--ctrlw);stroke-width:1.6}
.w.bus{stroke-width:3}
.dimmed .w{opacity:.28}
.dimmed .w.hot,.w.hot{stroke:var(--hot);stroke-width:3.4;opacity:1}
.w.hot.bus{stroke-width:4.4}
.flow{stroke-dasharray:7 8;animation:flow 1s linear infinite}
.blk{fill:var(--surface-2);stroke:var(--wire);stroke-width:1.8}
.blk.hot{fill:color-mix(in srgb,var(--hot) 14%,var(--surface));stroke:var(--hot)}
.mux{fill:var(--surface);stroke:var(--wire);stroke-width:1.8}
.lbl-s{font-size:11px;fill:var(--ink-2)}
.lbl-m{font-size:13px;fill:var(--ink)}
.lbl-c{font-size:11px;fill:var(--ctrlw);font-weight:600}
.pin{font-family:'IBM Plex Mono',monospace;font-size:10.5px;fill:var(--ink-3)}
.pin.sel{fill:var(--hot);font-weight:700}
.legend{display:flex;flex-wrap:wrap;gap:12px;font-size:12.5px;color:var(--ink-2);margin:6px 2px 0}
.legend i{display:inline-block;width:18px;height:4px;border-radius:2px;vertical-align:middle;margin-right:6px}

/* signal chips */
.sigs{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0}
.sig{font-family:'IBM Plex Mono',monospace;font-size:12.5px;border:1px solid var(--line);background:var(--surface);border-radius:7px;padding:3px 8px;color:var(--ink-2)}
.sig.on{border-color:var(--hot);color:var(--hot);background:color-mix(in srgb,var(--hot) 10%,var(--surface));font-weight:600}
.sig.z{opacity:.55}

/* pipeline grid */
.pipegrid{overflow-x:auto;margin:10px 0;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.pipegrid svg{display:block;max-width:none;height:auto}
.pipegrid text{font-family:'IBM Plex Mono',monospace}
.stage-cell{rx:5}
.hz-list{margin:8px 0;padding-left:1.2em}
.hz-list li{margin:5px 0}
.kbd{font-family:'IBM Plex Mono',monospace;font-size:.92em;background:var(--sunken);border:1px solid var(--line-2);border-radius:5px;padding:0 5px}

/* instruction editor */
.instr-ed{display:grid;gap:6px;margin:10px 0}
.instr-row{display:grid;grid-template-columns:28px minmax(0,1fr) auto;gap:8px;align-items:center}
.instr-row .n{font-family:'IBM Plex Mono',monospace;font-size:12.5px;color:var(--ink-3);text-align:right}
.instr-row input[type=text]{font-size:14px;padding:6px 10px}
.instr-row label{font-size:12.5px;color:var(--ink-2);display:flex;align-items:center;gap:4px;white-space:nowrap}

/* small form controls */
.opt{display:inline-flex;align-items:center;gap:6px;font-size:13.5px;color:var(--ink-2);background:var(--sunken);border:1px solid var(--line);border-radius:9px;padding:4px 10px}
.opt select,.opt input{width:auto;padding:3px 6px;font-size:13.5px;border-radius:6px}
.opt input[type=number]{width:84px;font-family:'IBM Plex Mono',monospace;background:var(--surface);color:var(--ink);border:1px solid var(--line)}

/* memo / exam overview */
.ovtable td:first-child{font-family:'IBM Plex Mono',monospace;font-weight:600;white-space:nowrap}
.memo-grid{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.memo{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:12px 14px;font-size:14px}
details.learn .memo h4,.memo h4{margin:0 0 6px;font-size:14.5px}
.memo ul{margin:4px 0;padding-left:1.1em}
.flash-q{border:1px solid var(--line);border-radius:11px;background:var(--surface);margin:0 0 8px}
.flash-q summary{cursor:pointer;padding:10px 14px;list-style:none;font-weight:500}
.flash-q summary::-webkit-details-marker{display:none}
.flash-q summary::before{content:'?';display:inline-grid;place-items:center;width:22px;height:22px;border-radius:6px;background:var(--data-soft);color:var(--data);font-family:'IBM Plex Mono',monospace;font-weight:700;font-size:12.5px;margin-right:10px}
.flash-q[open] summary{border-bottom:1px dashed var(--line)}
.flash-q .a{padding:9px 14px 12px 46px;color:var(--ink-2);font-size:14.5px}
.lesson-cards{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}
.lesson-card{display:flex;flex-direction:column;gap:6px;background:var(--surface);border:1px solid var(--line);border-radius:13px;padding:14px 16px;text-decoration:none;color:var(--ink);box-shadow:var(--shadow);transition:transform .18s,box-shadow .18s,border-color .18s}
.lesson-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lift);border-color:var(--cs)}
.lesson-card .k{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--cs)}
.lesson-card b{font-family:'Chakra Petch',sans-serif;font-size:16px}
.lesson-card span{font-size:13px;color:var(--ink-2)}
.lesson-card.soon{opacity:.6;pointer-events:none}
.badge-soon{font-family:'Chakra Petch',sans-serif;font-size:11px;font-weight:700;color:var(--boot);background:var(--boot-soft);border-radius:20px;padding:1px 8px;align-self:flex-start}
.toc-chips{display:flex;flex-wrap:wrap;gap:6px;margin:14px 0 0}
.toc-chips a{font-family:'Chakra Petch',sans-serif;font-weight:600;font-size:13px;text-decoration:none;border:1px solid var(--line);border-radius:20px;padding:4px 12px;color:var(--ink-2);background:var(--surface)}
.toc-chips a:hover{border-color:var(--cs);color:var(--cs)}
.small{font-size:13px;color:var(--ink-3)}
.nowrap{white-space:nowrap}
.mt0{margin-top:0}
.two{display:grid;gap:16px}
@media(min-width:900px){.two{grid-template-columns:1fr 1fr}}
.two>*{min-width:0}

.diagram.alu svg{max-width:720px;margin:0 auto}
.explain .diagram svg{min-width:0}
.explain .diagram{overflow:visible}
.q3key td,.q3key th{padding:5px 6px;font-size:12.5px}
.q3key .z{color:var(--ink-3);opacity:.6}
.q3t td{padding:4px 3px}
.q3t th{font-size:11px}
.gen-ctrls select{width:auto;max-width:100%}
.lab-head{flex-wrap:wrap;row-gap:2px}
.w.ans{stroke-dasharray:2600;stroke-dashoffset:2600;animation:drawIn 1.2s ease forwards;animation-delay:var(--d,0s)}
@keyframes drawIn{to{stroke-dashoffset:0}}
.w.ans.c-reg{stroke:var(--cs);stroke-width:2.6}
.w.ans.c-data{stroke:var(--add);stroke-width:3.6}
.w.ans.c-sh{stroke:var(--hot);stroke-width:3}
.w.ans.thin{stroke-width:2}
.chip-in{animation:chipIn .45s ease}
@keyframes chipIn{from{transform:translateX(-60px);opacity:.2}to{transform:none;opacity:1}}
.opt{flex-wrap:wrap;max-width:100%}
.opt select{max-width:100%}