:root{color-scheme:dark;--bg:#071012;--panel:#0d191c;--line:#284044;--muted:#aec1c5;--ink:#f1f7f7;--teal:#50ddd2;--good:#8ae4ac;--warn:#ffd27e;--bad:#ff9c9c;--mono:ui-monospace,SFMono-Regular,Consolas,monospace;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg)}
*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}
button,.button-label{border:1px solid #416067;background:#14262b;color:var(--ink);border-radius:7px;padding:.6rem .85rem;cursor:pointer;font-size:.86rem;min-height:40px;line-height:1.3}
button:hover,.button-label:hover{border-color:var(--teal);background:#1b3338}button:disabled{opacity:.43;cursor:default}
button.primary{background:var(--teal);border-color:var(--teal);color:#071c1a;font-weight:750}button.primary:hover{background:#8df0e6}button.quiet{background:transparent}button.danger{color:var(--bad)}button.small{min-height:32px;padding:.35rem .6rem;font-size:.76rem}
a{color:var(--teal);text-underline-offset:4px}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible,[tabindex]:focus-visible,.button-label:focus-within{outline:3px solid #ffe2a0;outline-offset:3px}
p{line-height:1.55;margin:.5rem 0}h1,h2,h3{line-height:1.2;margin:.25rem 0 .65rem}h1{font-size:clamp(2.2rem,4.6vw,3.8rem);font-weight:740;letter-spacing:-.04em}h2{font-size:1.12rem}h3{font-size:.95rem}
small,.small{font-size:.8rem;line-height:1.5;color:var(--muted)}
label{display:flex;flex-direction:column;gap:.35rem;font-size:.78rem;color:var(--muted);min-width:0}label.check{flex-direction:row;align-items:center;gap:.6rem;color:var(--ink);font-size:.85rem}
input,select,textarea{width:100%;min-width:0;border:1px solid #416067;border-radius:6px;background:#081316;color:var(--ink);padding:.55rem .6rem;min-height:40px}
input[type=checkbox],input[type=radio]{accent-color:var(--teal);width:19px;min-height:19px;flex:none}
fieldset{border:0;padding:0;margin:0;min-width:0}legend{line-height:1.5;margin-bottom:.6rem;font-weight:600}
summary{cursor:pointer;color:var(--ink);font-size:.9rem;padding:.35rem 0;line-height:1.5}details[open]>summary{margin-bottom:.75rem}
.eyebrow{font:600 .68rem/1.4 var(--mono);letter-spacing:.13em;color:var(--teal);margin:0 0 .55rem}
.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
.skip{position:absolute;left:16px;top:-100px;z-index:20;padding:12px;background:#071012}.skip:focus{top:12px}
.site-header{border-bottom:1px solid var(--line);padding:1rem max(24px,calc((100vw - 1560px)/2));display:flex;align-items:center;gap:2rem}.site-header a{font-size:.83rem;text-decoration:none}.site-header .wordmark{font-size:1.2rem;font-weight:750;color:var(--ink);letter-spacing:-.04em}.wordmark span{color:var(--teal)}.site-header .eyebrow{margin:0 0 0 auto}
main{max-width:1608px;margin:auto;padding:28px 24px 48px}
.intro{display:flex;justify-content:space-between;align-items:center;margin-bottom:26px;gap:20px}.intro>div>p:not(.eyebrow){color:var(--muted);max-width:760px}.intro-note{font-size:.85rem;text-align:right;flex-shrink:0}.intro-note p{font-size:.78rem;color:var(--muted)}.status-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--teal);margin-right:7px}
.lesson-nav{display:grid;grid-template-columns:repeat(2,1fr) .7fr;gap:9px;margin-bottom:16px}.lesson-nav button{display:flex;gap:12px;align-items:center;text-align:left;padding:14px;background:#0b1518;position:relative}.lesson-nav small{display:block;margin-top:6px}.lesson-nav [aria-current=step]{border-color:var(--teal);background:#11292c;box-shadow:inset 0 3px var(--teal)}.lesson-number{font:600 .95rem var(--mono);color:var(--teal)}.done-mark{margin-left:auto;color:var(--good)}
.panel{border:1px solid var(--line);border-radius:12px;background:var(--panel)}
.about{margin-bottom:18px}.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:6px 28px;padding:0 20px 18px}.about-grid p{font-size:.9rem;color:var(--muted)}.about-grid b{color:var(--ink)}
.brief{display:flex;justify-content:space-between;gap:24px;padding:20px 24px;margin-bottom:18px;border-left:3px solid var(--teal)}.brief>div:first-child{max-width:880px}.brief p:not(.eyebrow){color:var(--muted);font-size:.9rem}.brief-note{color:var(--warn)!important}.brief-note:empty{display:none}.brief-actions{max-width:350px;flex-shrink:0;text-align:right}.brief-actions button{margin-left:10px;margin-top:6px}.brief-actions #hint-text{text-align:left;font-size:.85rem;color:var(--ink)!important;border-left:2px solid var(--warn);padding-left:10px}
.badge{display:inline-block;border:1px solid #466167;padding:6px 10px;border-radius:20px;font:500 .69rem var(--mono);color:var(--muted)}.badge.verified{color:var(--good);border-color:#4c8260}
.workspace{display:grid;grid-template-columns:270px minmax(0,1fr);align-items:start;gap:18px}.workspace.no-rail{grid-template-columns:minmax(0,1fr)}
.rail{padding:18px;position:sticky;top:12px}.rail-list{list-style:none;margin:0;padding:0;counter-reset:step}.rail-list li{display:flex;gap:10px;align-items:flex-start;padding:8px 6px;border-top:1px solid #1e3236;font-size:.82rem;line-height:1.4}.rail-list li:first-child{border-top:0}.rail-list li .mark{flex:none;width:20px;height:20px;border-radius:50%;border:1px solid #466167;display:inline-grid;place-items:center;font-size:.7rem;color:var(--muted)}.rail-list li.done .mark{background:var(--good);border-color:var(--good);color:#071c1a}.rail-list li.current{background:#11292c;border-radius:6px}.rail-list li.current .mark{border-color:var(--teal);color:var(--teal)}.rail-list li .note{display:block;color:var(--warn);font-size:.74rem;margin-top:3px}.rail-foot{margin:14px 0 0}
.panes{display:grid;gap:18px;min-width:0}.two-up{display:grid;grid-template-columns:1fr 1fr;gap:18px;min-width:0}
.panel-heading{padding:18px 20px 8px;display:flex;justify-content:space-between;gap:12px;align-items:center}
.bench-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;padding:6px 20px 20px}
.card{background:#091619;border:1px solid #2b454b;border-radius:9px;padding:14px;min-width:0;display:grid;gap:10px;align-content:start}.card h3{margin:0}.card .label{font:500 .68rem/1.6 var(--mono);color:var(--muted);background:#0b1c20;border:1px dashed #37565e;border-radius:6px;padding:8px}.card .label b{color:var(--ink)}
.lights{display:flex;gap:8px;flex-wrap:wrap}.lights span{font:500 .62rem var(--mono);color:var(--muted);display:inline-flex;align-items:center;gap:4px}.lights i{width:9px;height:9px;border-radius:50%;background:#2c3f43;border:1px solid #3d5a60}.lights i.on{background:var(--good);box-shadow:0 0 6px var(--good)}.lights i.blink{background:var(--warn);animation:blink .5s steps(2) infinite}@keyframes blink{to{opacity:.2}}
.row{display:flex;gap:8px;align-items:end;flex-wrap:wrap}.row>label{flex:1 1 150px}.row>button{flex:none}
.packing{list-style:none;margin:0;padding:0;display:grid;gap:4px}.packing li{display:flex;align-items:center;gap:8px;font-size:.82rem}.packing .missing{color:var(--bad);font-size:.72rem}.packing .replaced{color:var(--good);font-size:.72rem}
.status{font-size:.78rem;color:var(--muted)}.status b{color:var(--ink)}.status.good b{color:var(--good)}.status.bad b{color:var(--bad)}
.hold{display:grid;grid-template-columns:1fr;gap:8px}.hold output{font:600 .8rem var(--mono);color:var(--warn)}
.url-bar{display:flex;gap:6px;align-items:center;padding:10px 20px 0}.url-bar input{border-radius:20px}
.page{padding:14px 20px 20px;min-height:340px;font-size:.86rem}.page h3{margin-top:0}.page .muted{color:var(--muted)}
.rtabs{display:flex;gap:4px;flex-wrap:wrap;border-bottom:1px solid var(--line);margin-bottom:12px}.rtabs button,.tabs button{border:0;border-bottom:2px solid transparent;border-radius:0;background:transparent;min-height:36px;padding:.4rem .7rem;font-size:.8rem;color:var(--muted)}.rtabs button[aria-selected=true],.tabs button[aria-selected=true]{color:var(--teal);border-bottom-color:var(--teal)}
.tabs{display:flex;gap:4px;flex-wrap:wrap;border-bottom:1px solid var(--line);margin:0 20px}
.form-grid{display:grid;gap:10px;max-width:520px}.form-grid .row{align-items:end}
.kv{display:grid;grid-template-columns:auto 1fr;gap:6px 14px;font:500 .78rem/1.6 var(--mono)}.kv dt{color:var(--muted)}.kv dd{margin:0}
table{border-collapse:collapse;width:100%;font:500 .74rem/1.5 var(--mono);margin:10px 0}td,th{padding:8px 6px;border-bottom:1px solid #284044;text-align:left;overflow-wrap:anywhere}th{color:var(--muted)}
.search-page{background:#f7f7f7;color:#202124;border-radius:8px;padding:16px}.search-page .r{margin:12px 0}.search-page .r a{color:#1a0dab;pointer-events:none;text-decoration:none}.search-page .r .u{color:#006621;font-size:.75rem}.search-page .q{border:1px solid #ccc;border-radius:20px;padding:6px 14px;display:inline-block;background:#fff}
.login-box{max-width:360px;margin:20px auto;background:#e9edf0;color:#1c2b30;border-radius:8px;padding:20px}.login-box h3{color:#0f3b45}.login-box label{color:#334}.login-box input{background:#fff;color:#111;border-color:#aab}.login-box .err{color:#a11;font-size:.8rem}.login-box button{background:#0f6b78;border-color:#0f6b78;color:#fff}
.admin{background:#e9edf0;color:#1c2b30;border-radius:8px;padding:0 0 12px;overflow:hidden}.admin .bar{background:#0f3b45;color:#fff;padding:10px 14px;display:flex;justify-content:space-between;align-items:center;font-size:.8rem}.admin .bar button{background:transparent;border-color:#5aa;color:#fff;min-height:30px;padding:.2rem .6rem;font-size:.72rem}.admin .rtabs{padding:0 14px;border-bottom-color:#c5cfd4}.admin .rtabs button{color:#345}.admin .rtabs button[aria-selected=true]{color:#0f6b78;border-bottom-color:#0f6b78}.admin .body{padding:6px 14px}.admin label{color:#334}.admin input,.admin select{background:#fff;color:#111;border-color:#aab}.admin .kv dt{color:#567}.admin button.primary{background:#0f6b78;border-color:#0f6b78;color:#fff}.admin table{color:#1c2b30}.admin td,.admin th{border-bottom-color:#c5cfd4}.admin th{color:#567}.admin .muted{color:#567}.admin .warnbox{background:#fff3cd;color:#664d03;border-radius:6px;padding:8px 10px;font-size:.8rem}
.win{background:#f3f3f3;color:#1b1b1b;border-radius:8px;padding:14px;min-height:300px}.win h3{color:#1b1b1b}.win .muted{color:#555}.win label{color:#333}.win input,.win select{background:#fff;color:#111;border-color:#bbb}.win button{background:#fff;border-color:#bbb;color:#111}.win button.primary{background:#0067c0;border-color:#0067c0;color:#fff}.win button:hover{background:#e6f0fb}
.netlist{list-style:none;margin:0;padding:0}.netlist li{display:flex;align-items:center;gap:10px;padding:8px;border-radius:6px;font-size:.85rem}.netlist li:hover{background:#e6e6e6}.netlist .band{font-size:.72rem;color:#555;margin-left:auto}.netlist li.joined{background:#dfeefb}
.tree{font-size:.84rem;list-style:none;margin:0;padding:0}.tree li{padding:3px 0 3px 18px}.tree li.h{padding-left:0;font-weight:600}.tree .warnicon{color:#b58900;margin-right:4px}.tree .okicon{color:#2c7a3f;margin-right:4px}
.cmd{background:#0c0c0c;color:#ccc;font:500 .78rem/1.45 var(--mono);border-radius:8px;padding:12px;min-height:300px;max-height:420px;overflow:auto;white-space:pre-wrap;overflow-wrap:anywhere;margin:0}.cmd-form{display:flex;gap:6px;align-items:center;padding:0 20px 18px;background:transparent}.cmd-prompt{font:500 .78rem var(--mono);color:#ccc;background:#0c0c0c;padding:.62rem .5rem;border-radius:6px}.cmd-form input{font-family:var(--mono);background:#0c0c0c;color:#eee;border-color:#333}
.show-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;padding:6px 20px 20px}.show-grid .box{background:#11252a;border:1px solid #365c64;border-radius:9px;padding:16px}.show-grid .box label{flex-direction:row;align-items:flex-start;gap:9px;padding:9px;background:#09181c;border:1px solid #37565e;border-radius:6px;margin:6px 0;color:var(--ink);font-size:.84rem;line-height:1.45}.show-grid .box label code{font-family:var(--mono);font-size:.76rem}.feedback{font-size:.84rem;margin-top:8px}.feedback.good{color:var(--good)}.feedback.bad{color:var(--warn)}
.sheet-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;padding:6px 20px 20px}.sheet-grid .wide{grid-column:1/-1}
.session-bar{display:flex;justify-content:space-between;align-items:center;padding:18px 20px;margin-top:20px;gap:20px}.session-bar h2{font-size:1rem}.session-actions{display:flex;gap:8px;flex-wrap:wrap}.button-label{position:relative;display:inline-flex;align-items:center;color:var(--ink)}.button-label input{position:absolute;inset:0;opacity:0;width:100%;height:100%;cursor:pointer}
.session-data{padding:14px 20px;margin-top:16px}.session-data textarea{resize:vertical;font:500 .75rem/1.5 var(--mono);margin-bottom:12px}
.scope{margin:20px 2px;color:var(--muted);max-width:1040px;font-size:.83rem}.scope summary{color:var(--muted)}
.notice{position:fixed;left:50%;bottom:18px;transform:translateX(-50%);max-width:min(680px,calc(100vw - 30px));width:max-content;background:#173a3a;border:1px solid var(--teal);border-radius:8px;box-shadow:0 8px 30px #0008;padding:13px 18px;margin:0;z-index:50;font-size:.86rem}.notice:empty{display:none}.notice.error{background:#341f23;border-color:var(--bad)}
footer{border-top:1px solid var(--line);padding:20px 24px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:.75rem;color:var(--muted)}
[hidden]{display:none!important}
@media(min-width:1700px){.bench-grid{grid-template-columns:1.2fr 1fr 1fr 1fr .9fr}}
@media(max-width:1250px){.bench-grid{grid-template-columns:1fr 1fr}.two-up{grid-template-columns:1fr}.show-grid{grid-template-columns:1fr}}
@media(max-width:1050px){.about-grid{grid-template-columns:1fr}.workspace{grid-template-columns:minmax(0,1fr)}.rail{position:static}.rail-list{display:grid;grid-template-columns:1fr 1fr}.rail-list li{border-top:0}.brief{align-items:flex-start}.brief-actions{max-width:260px}.intro-note{display:none}.sheet-grid{grid-template-columns:1fr 1fr}}
@media(max-width:650px){main{padding:22px 12px 32px}.site-header{padding:16px 14px;gap:14px}.site-header .eyebrow{display:none}.lesson-nav{grid-template-columns:1fr}.lesson-nav button{padding:11px 8px;gap:7px;font-size:.76rem}.brief{display:block;padding:16px}.brief-actions{max-width:none;margin-top:12px;text-align:left}.brief-actions button{margin-left:0;margin-right:8px}.bench-grid{grid-template-columns:1fr;padding:6px 14px 14px}.panel-heading{padding:16px 14px 8px}.page{padding:12px 14px 16px}.url-bar{padding:10px 14px 0}.tabs{margin:0 14px}.rail-list{grid-template-columns:1fr}.sheet-grid{grid-template-columns:1fr;padding:6px 14px 14px}.show-grid{padding:6px 14px 14px}.session-bar{display:block;padding:16px}.session-actions{margin-top:14px}.cmd-form{padding:0 14px 14px}footer{padding:18px 14px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation:none!important;transition:none!important}.lights i.blink{background:var(--warn)}}
@media print{.site-header,.lesson-nav,.session-bar,.session-data,.scope,footer,.notice,.url-bar,.cmd-form,.tabs{display:none}body{background:white;color:black}.workspace{display:block}.panel{break-inside:avoid}}