/* (cl-batch147, John 2026-10-29) Basics drills: reading a multimeter, where to put the probes, lockout/tagout steps in order.
   Used with css/short-lessons.css (res-* page frame). Phone first. */
.drill-page .res-hero{padding:40px 0 38px}
.drill-page .res-hero h1{font-size:clamp(32px,4.4vw,52px);margin:12px 0 16px}
.drill-intro{max-width:820px;font-size:17px;color:#2c4a5f;margin:28px 0 0}
.drill-intro p{margin:0 0 12px}
.drill-shell{background:#fff;border:1px solid #d6e2e9;border-radius:18px;box-shadow:0 10px 30px #0a304509;margin:26px 0 30px;overflow:hidden}
.drill-top{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 22px;background:#0a2235;color:#d8e8f1;font-size:14px}
.drill-top strong{color:#fff;font-size:15px}
.drill-bar{flex:1;max-width:260px;height:8px;border-radius:99px;background:#24465c;overflow:hidden}
.drill-bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,#18c8ed,#ff9a2f);transition:width .3s}
.drill-body{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:26px;padding:24px 26px 26px;align-items:start}
.drill-q{font-size:20px;line-height:1.4;font-weight:700;color:#0e2f45;margin:0 0 6px}
.drill-q:focus{outline:none}
.drill-sub{color:#4a6275;font-size:15px;margin:0 0 16px}
.drill-choices{display:grid;gap:10px;margin:0;padding:0;list-style:none}
.drill-choice{display:block;width:100%;text-align:left;font:600 16px/1.4 Arial,Helvetica,sans-serif;color:#12364d;background:#f4f8fa;border:2px solid #cfdde6;border-radius:12px;padding:13px 16px;cursor:pointer;min-height:52px}
.drill-choice:hover{border-color:#7fb3cc;background:#eef5f9}
.drill-choice.is-right{border-color:#1b8a4a;background:#e5f5eb;color:#145c33}
.drill-choice.is-wrong{border-color:#c0392b;background:#fdeceb;color:#8f2418}
.drill-choice[disabled]{cursor:default}
.drill-fb{margin:16px 0 0;padding:13px 16px;border-radius:12px;font-size:15.5px;line-height:1.55;display:none}
.drill-fb.is-shown{display:block}
.drill-fb.good{background:#e5f5eb;color:#145c33;border:1px solid #9fd5b3}
.drill-fb.bad{background:#fff3e2;color:#7a4300;border:1px solid #f3c27f}
.drill-fb strong{display:block;margin-bottom:3px}
.drill-btn.drill-next{margin-top:16px;display:none}
.drill-btn.drill-next.is-shown{display:inline-flex}
.drill-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:12px 22px;border:0;border-radius:10px;background:#12364d;color:#fff;font:700 16px Arial,Helvetica,sans-serif;cursor:pointer;text-decoration:none}
.drill-btn:hover{background:#1e516d}
.drill-btn.alt{background:#e4edf2;color:#12364d}
.drill-btn.alt:hover{background:#d4e3ec}
.drill-page :focus-visible{outline:3px solid #1695c6;outline-offset:3px}
.drill-art{display:flex;flex-direction:column;align-items:center;gap:10px}
.drill-art svg{width:100%;max-width:360px;height:auto;display:block}
.drill-tip{font-size:13.5px;color:#5a6b7a;text-align:center;margin:0}
/* tappable parts of the drawings */
.drill-hit{cursor:pointer}
.drill-hit:focus{outline:none}
.drill-hit:focus-visible .hit-ring,.drill-hit:hover .hit-ring{stroke:#ff9a2f;stroke-width:4}
.drill-hit.is-on .hit-ring{stroke:#18c8ed;stroke-width:4}
.drill-hit.is-red .hit-ring{stroke:#d32f2f;stroke-width:5}
.drill-hit.is-black .hit-ring{stroke:#111;stroke-width:5}
.drill-hit.is-wrong .hit-ring{stroke:#c0392b;stroke-width:5}
.drill-hit.is-right .hit-ring{stroke:#1b8a4a;stroke-width:5}
.drill-pulse .hit-ring{animation:drillPulse 1.3s ease-in-out infinite}
@keyframes drillPulse{0%,100%{stroke-opacity:1}50%{stroke-opacity:.35}}
/* end screen */
.drill-done{padding:30px 26px 32px;text-align:center}
.drill-done h2{font-size:30px;letter-spacing:-.03em;margin:6px 0 10px;color:#0e2f45}
.drill-done p{color:#4a6275;font-size:16px;max-width:620px;margin:0 auto 18px}
.drill-done .drill-actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
.drill-score{font:800 52px/1 Arial,Helvetica,sans-serif;color:#12364d}
/* probe drill: lead status + checklist */
.drill-leads{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 12px}
.drill-lead{display:inline-flex;align-items:center;gap:7px;padding:6px 12px;border-radius:99px;background:#f4f8fa;border:1px solid #cfdde6;font-size:14px;font-weight:700;color:#24465c}
.drill-lead i{width:12px;height:12px;border-radius:50%;display:inline-block}
.drill-checks{list-style:none;margin:12px 0 0;padding:0;display:grid;gap:5px;font-size:15px}
.drill-checks li{color:#5a6b7a}
.drill-checks li.is-done{color:#145c33;font-weight:700}
.drill-checks li.is-next{color:#7a4300;font-weight:700}
.drill-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}
/* LOTO ordering */
.drill-order{display:grid;grid-template-columns:1fr 1fr;gap:22px;padding:24px 26px 26px}
.drill-order h3{font-size:15px;letter-spacing:.06em;text-transform:uppercase;color:#356581;margin:0 0 10px}
.drill-cards,.drill-picked{list-style:none;margin:0;padding:0;display:grid;gap:9px}
.drill-card{display:flex;gap:10px;align-items:flex-start;width:100%;text-align:left;font:600 15.5px/1.4 Arial,Helvetica,sans-serif;color:#12364d;background:#f4f8fa;border:2px solid #cfdde6;border-radius:12px;padding:12px 14px;cursor:pointer;min-height:50px}
.drill-card:hover{border-color:#7fb3cc}
.drill-card.is-wrong{border-color:#c0392b;background:#fdeceb;animation:drillShake .35s}
@keyframes drillShake{0%,100%{transform:none}25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}
.drill-picked li{display:flex;gap:10px;align-items:flex-start;padding:11px 14px;border-radius:12px;background:#e5f5eb;border:1px solid #9fd5b3;color:#145c33;font-weight:600;font-size:15.5px;line-height:1.4}
.drill-picked b{flex:0 0 auto;width:26px;height:26px;border-radius:50%;background:#1b8a4a;color:#fff;display:grid;place-items:center;font-size:14px}
.drill-picked .why{display:block;font-weight:400;color:#2f6b47;font-size:14px;margin-top:3px}
.drill-empty{color:#7a8b98;font-size:14px;border:2px dashed #cfdde6;border-radius:12px;padding:14px;text-align:center}
.drill-order .drill-fb{grid-column:1/-1;margin-top:0}
.drill-order .drill-btn.drill-next{grid-column:1/-1;margin-top:0;justify-self:start}
/* (cl-batch149) ladder logic drills: rungs with tappable slots, a picker, and a live test panel */
.lad-wrap{padding:24px 26px 26px}
.lad-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:6px 0 4px;padding-bottom:4px}
.lad{min-width:max-content;background:#0f2433;border-radius:14px;padding:14px 12px 10px;color:#9fb4c4}
.lad-rung{display:flex;align-items:flex-start;gap:0;position:relative;padding:4px 0 10px}
.lad-rung+.lad-rung{border-top:1px dashed #2b4659;padding-top:12px}
.lad-num{flex:0 0 26px;font:700 13px/1 Consolas,monospace;color:#6f8ea3;padding-top:24px}
.lad-line{position:relative;display:flex;align-items:flex-start;flex:1;border-left:4px solid #8aa4b6;border-right:4px solid #8aa4b6;min-height:60px;padding:0 0}
.lad-line::before{content:"";position:absolute;left:0;right:0;top:29px;height:3px;background:#56738a}
.lad-fill{flex:1;min-width:14px}
.lad-el{position:relative;z-index:1;display:flex;flex-direction:column;align-items:center;width:84px;height:60px;padding:2px 0 0;border:0;background:#0f2433;color:#d7e3ec;cursor:pointer;font:inherit;border-radius:8px}
.lad-el .lad-tag{font:700 11.5px/1.2 Arial,Helvetica,sans-serif;height:15px;max-width:82px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#9fd8ee}
.lad-el .lad-sym{display:block;width:84px;height:28px;margin-top:5px}
.lad-el .lad-sym svg{width:84px;height:28px;display:block}
.lad-el.is-empty{color:#ffb56b}.lad-el.is-empty .lad-tag{color:#ffb56b;font-weight:400}
.lad-el.is-active{outline:3px solid #ff9a2f;outline-offset:-2px}
.lad-el.is-fixed{cursor:default;opacity:.85}
.lad-el:not(.is-fixed):hover{background:#17344a}
.lad-el.is-true{color:#4ee08a}.lad-el.is-true .lad-tag{color:#4ee08a}
.lad-branch{position:relative;display:flex;flex-direction:column}
.lad-branch::before,.lad-branch::after{content:"";position:absolute;top:29px;height:63px;width:3px;background:#56738a}
.lad-branch::before{left:0}.lad-branch::after{right:0}
.lad-brow{position:relative;display:flex;padding:0 6px}
.lad-brow+.lad-brow{margin-top:3px}
.lad-brow+.lad-brow::before{content:"";position:absolute;left:0;right:0;top:29px;height:3px;background:#56738a}
.lad-pick{margin:10px 0 4px;padding:14px;border:2px solid #ff9a2f;border-radius:14px;background:#fffaf3}
.lad-pick-h{margin:0 0 10px;font-weight:700;color:#7a4300;font-size:14px}
.lad-opts{display:grid;gap:8px;margin-bottom:10px}
.lad-opt{display:flex;align-items:center;gap:12px;text-align:left;font:600 14px/1.35 Arial,Helvetica,sans-serif;color:#12364d;background:#fff;border:2px solid #cfdde6;border-radius:10px;padding:8px 12px;cursor:pointer;min-height:48px}
.lad-opt .lad-sym svg{width:64px;height:28px;display:block;color:#12364d}
.lad-opt.is-on{border-color:#1695c6;background:#e9f6fc}
.lad-tags{display:flex;flex-wrap:wrap;gap:8px}
.lad-chip{display:flex;flex-direction:column;align-items:flex-start;font:700 14px/1.2 Consolas,'Courier New',monospace;color:#12364d;background:#fff;border:2px solid #cfdde6;border-radius:10px;padding:8px 12px;cursor:pointer;min-height:48px}
.lad-chip small{font:400 11.5px/1.3 Arial,Helvetica,sans-serif;color:#5a6b7a;margin-top:2px}
.lad-chip.is-on{border-color:#1695c6;background:#e9f6fc}
.lad-pick-foot{display:flex;gap:10px;justify-content:flex-end;margin-top:12px}
.lad-test{margin:14px 0 0;padding:14px 16px;background:#f4f8fa;border:1px solid #d6e2e9;border-radius:14px}
.lad-test-h{margin:0 0 10px;font-size:11.5px;font-weight:800;letter-spacing:.1em;color:#356581}
.lad-test-row{display:flex;flex-wrap:wrap;gap:18px 30px;align-items:flex-start;justify-content:space-between}
.lad-btns,.lad-lamps{display:flex;flex-wrap:wrap;gap:16px}
.lad-pb,.lad-lamp-w{display:flex;flex-direction:column;align-items:center;gap:4px;min-width:70px;text-align:center}
.lad-pb b,.lad-lamp-w b{font-size:13px;color:#24465c}
.lad-pb small{font:11px Consolas,monospace;color:#627889}
.lad-pb small i{font-style:normal;font-weight:700;color:#12364d}
.lad-push{width:60px;height:60px;border-radius:50%;border:4px solid #2b2f33;background:#3d4650;cursor:pointer;touch-action:none;-webkit-user-select:none;user-select:none;display:grid;place-items:center;box-shadow:0 4px 0 #1d2329}
.lad-push span{width:40px;height:40px;border-radius:50%;background:radial-gradient(circle at 35% 30%,#ffffff55,#0000 60%),var(--pb,#6b7a86)}
.lad-push.green{--pb:#1f9d55}.lad-push.red{--pb:#d32f2f}.lad-push.blue{--pb:#1e6fd9}
.lad-push.is-down{transform:translateY(3px);box-shadow:0 1px 0 #1d2329}
.lad-push:focus-visible{outline:3px solid #1695c6;outline-offset:3px}
.lad-lamp{width:52px;height:52px;border-radius:50%;background:#3a2c18;border:4px solid #2b2f33;box-shadow:inset 0 -4px 8px #0006}
.lad-lamp.is-on{background:radial-gradient(circle at 40% 35%,#fff7cc,#ffc400 55%,#e08e00);box-shadow:0 0 18px 6px #ffc40088}
.lad-all{min-height:44px;font-size:14px;padding:10px 14px}
@media(max-width:620px){.lad-wrap{padding:18px 14px 20px}.lad-el{width:70px}.lad-el .lad-sym,.lad-el .lad-sym svg{width:70px}.lad-el .lad-tag{max-width:68px;font-size:10.5px}.lad-test-row{gap:14px}.lad-push{width:54px;height:54px}.lad-lamp{width:46px;height:46px}}
@media(prefers-reduced-motion:reduce){.lad-push.is-down{transform:none}}
.ex-group{padding-top:34px}.ex-group .drill-hub{padding-block:14px 10px}
.ex-group-head h2{font-size:28px;letter-spacing:-.025em;margin:0;color:#0e2f45}
@media(max-width:620px){.ex-group{padding-top:24px}.ex-group-head h2{font-size:23px}}
/* reference section + hub */
.drill-ref{background:#fff;border:1px solid #d6e2e9;border-radius:18px;padding:26px 28px;margin:0 0 30px}
.drill-ref h2{font-size:26px;letter-spacing:-.025em;margin:0 0 12px}
.drill-ref h3{font-size:18px;margin:20px 0 8px}
.drill-ref p,.drill-ref li{color:#3f596d;font-size:15.5px;line-height:1.7}
.drill-ref table{width:100%;border-collapse:collapse;font-size:15px;margin:8px 0 6px}
.drill-ref th,.drill-ref td{border-bottom:1px solid #e1e9ee;padding:9px 8px;text-align:left;vertical-align:top}
.drill-ref th{color:#24465c;background:#f4f8fa}
.drill-note{font-size:13.5px;color:#627889;margin:6px 0 0}
.drill-hub{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;padding-block:40px}
.drill-hub a{display:flex;flex-direction:column;text-decoration:none;color:inherit;background:#fff;border:1px solid #d6e2e9;border-radius:18px;overflow:hidden;box-shadow:0 10px 30px #0a304509}
.drill-hub a:hover{box-shadow:0 15px 36px #0a30451a}
.drill-hub .art{background:linear-gradient(135deg,#0a2235,#153d55);display:grid;place-items:center;height:190px;padding:14px}
.drill-hub .art svg{height:100%;width:auto;max-width:100%}
.drill-hub .copy{padding:22px 24px 24px}
.drill-hub h2{font-size:23px;line-height:1.25;letter-spacing:-.02em;margin:0 0 10px}
.drill-hub p{color:#4a6275;margin:0 0 16px;font-size:15px;line-height:1.65}
.drill-hub strong{color:#08618b;font-size:15px}
.drill-hub .done{display:inline-block;margin-left:8px;padding:2px 9px;border-radius:99px;background:#e5f5eb;color:#145c33;font-size:12px;font-weight:700}
@media(max-width:900px){.drill-body,.drill-order{grid-template-columns:1fr}.drill-hub{grid-template-columns:1fr}.drill-art svg{max-width:300px}
  /* one column: the drawing sits right under the question, so nobody scrolls between reading and tapping */
  .drill-body{gap:0}.drill-body>div:first-child{display:contents}
  .drill-body .drill-q{order:1}.drill-body .drill-sub{order:2}.drill-body .drill-leads{order:3}.drill-body .m{order:4;margin-bottom:10px}.drill-body .drill-art{order:5;margin-bottom:12px}.drill-body .drill-row{order:6}.drill-body .drill-checks{order:7}.drill-body .drill-choices{order:8}.drill-body .drill-fb{order:9}.drill-body .drill-next{order:10;justify-self:start}}
@media(max-width:900px){.drill-order>div:first-child{order:1}.drill-order .drill-fb{order:2}.drill-order .drill-btn.drill-next{order:3}.drill-order>div:nth-child(2){order:4}}
@media(max-width:620px){.drill-page .res-hero{padding:26px 0 24px}.drill-page .res-hero h1{font-size:30px;margin:8px 0 12px}.drill-page .res-hero h1 span{font-size:20px;line-height:1.3;letter-spacing:-.01em}.drill-page .res-lead{font-size:16px}.drill-page .res-tags{margin-top:14px}.drill-intro{font-size:16px;margin-top:20px}.drill-art svg{max-width:230px}.drill-art .p svg{max-width:330px}.drill-tip{font-size:12.5px}}
@media(max-width:620px){.drill-body,.drill-order{padding:18px 16px 20px;gap:16px}.drill-top{padding:12px 16px}.drill-q{font-size:18px}.drill-ref{padding:20px 18px}.drill-done{padding:24px 16px}.drill-hub .art{height:160px}}
@media(prefers-reduced-motion:reduce){.drill-pulse .hit-ring,.drill-card.is-wrong{animation:none}.drill-bar i{transition:none}}