/* Field challenges (field-games.js): isolate, lift, bolt up. */
.fg{display:flex;flex-direction:column;gap:10px}
.fg-tabs{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--ink);background:var(--white)}
.fg-tabs button{position:relative;display:flex;align-items:baseline;gap:7px;padding:10px 12px;border:0;border-right:1px solid var(--line);background:transparent;color:var(--ink);font:700 var(--t-label)/1.2 var(--font-mono);letter-spacing:.1em;text-align:left;text-transform:uppercase;cursor:pointer}
.fg-tabs button:last-child{border-right:0}
.fg-tabs small{color:var(--rust-text);font-size:10px}
.fg-tabs button[aria-selected="true"]{background:var(--ink);color:var(--white);box-shadow:inset 0 -4px 0 var(--rust)}
.fg-tabs button:hover,.fg-tabs button:focus-visible{outline:2px solid var(--rust-text);outline-offset:-2px}
.fg-tabs i{margin-left:auto;width:16px;height:16px;border:1px solid currentColor;border-radius:50%;opacity:.35}
.fg-tabs .is-done i{border-color:var(--rust);background:var(--rust);opacity:1;box-shadow:inset 0 0 0 3px var(--white)}
.fg-tabs button[aria-selected="true"].is-done i{box-shadow:inset 0 0 0 3px var(--ink)}
.fg-panel{position:relative}
.fg-brief{margin:0 0 8px;color:var(--soft);font:var(--t-note)/1.5 var(--font-body)}
.fg-brief b{color:var(--ink)}
.fg-stage{display:grid;grid-template-columns:minmax(0,1fr);gap:10px}
.fg-svg{display:block;width:100%;height:auto;border:1px solid #8c938a;background:var(--white)}
.fg-side{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px;align-items:start}
.fg-read{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));margin:0;border:1px solid var(--ink);background:var(--white)}
.fg-read div{padding:6px 9px;border-right:1px solid var(--line)}
.fg-read div:last-child{border-right:0}
.fg-read dt{color:var(--rust-text);font:10px/1.2 var(--font-mono);letter-spacing:.08em;text-transform:uppercase}
.fg-read dd{margin:3px 0 0;color:var(--ink);font:500 18px/1.1 var(--font-display);font-variant-numeric:tabular-nums}
.fg-actions{display:flex;flex-wrap:wrap;gap:6px}
.fg-btn{padding:9px 12px;border:1px solid var(--ink);background:var(--ink);color:var(--white);font:700 var(--t-label)/1 var(--font-mono);letter-spacing:.1em;text-transform:uppercase;cursor:pointer}
.fg-btn.ghost{background:transparent;color:var(--ink)}
.fg-btn:hover,.fg-btn:focus-visible{border-color:var(--rust-strong);background:var(--rust-strong);color:#fff;outline:none}
.fg-steps{grid-column:1/-1;margin:0;padding:6px 10px 6px 28px;border:1px dashed #a9a396;background:#f3efe5;color:var(--ink);font:var(--t-note)/1.45 var(--font-body);min-height:34px}
.fg-steps li::marker{color:var(--rust-text);font:700 11px var(--font-mono)}
.fg-steps .fg-empty{list-style:none;margin-left:-18px;color:var(--soft)}
.fg-msg{min-height:1.45em;margin:8px 0 0;color:var(--soft);font:var(--t-note)/1.45 var(--font-body)}
.fg-msg.is-warn{color:var(--rust-text);font-weight:600}
.fg-msg.is-warn::before{content:"⚠ ";}
.fg-stamp{position:absolute;top:44px;right:10px;z-index:2;margin:0;padding:6px 10px;border:2px solid var(--rust);background:var(--paper);color:var(--rust-text);font:700 12px/1.2 var(--font-mono);letter-spacing:.12em;text-transform:uppercase;opacity:0;pointer-events:none;transform:rotate(-5deg) scale(1.8)}
.fg-stamp.is-on{opacity:1;transform:rotate(-5deg);transition:opacity .2s,transform .45s cubic-bezier(.3,1.5,.5,1)}
.fg-stamp.amber{border-color:#b28d42;color:#8a6a24}
.fg-stamp.red{border-color:#a3271b;color:#a3271b}
.fg-note{margin:6px 0 0;color:var(--soft);font:11px/1.4 var(--font-mono);letter-spacing:.02em}

/* SVG drawing language */
.fg-label{fill:var(--soft);font:9px var(--font-mono);letter-spacing:.08em}
.fg-label.rust{fill:var(--rust-text);font-weight:700}
.fg-tag{fill:var(--ink);font:700 9px var(--font-mono);letter-spacing:.06em}
.fg-hit{fill:transparent;stroke:none}
[role="button"].fg-valve,[role="button"].fg-spade,[role="button"].fg-bolt{cursor:pointer;outline:none}

/* Isolate */
.fg-line{fill:none;stroke-width:5;stroke-linecap:round;stroke-linejoin:round;transition:stroke .4s}
.fg-line.live{stroke:var(--rust);stroke-dasharray:10 6;animation:fg-flow .8s linear infinite}
.fg-line.trapped{stroke:#d08b2c}
.fg-line.dead{stroke:#9aa39c}
.fg-line.purging{stroke:#7fa6b8;stroke-dasharray:6 6;animation:fg-flow .6s linear infinite}
.fg-line.inert{stroke:#7fa6b8}
.fg-line.side{stroke:#b7b2a5;stroke-width:3}
.fg-line.side.flowing{stroke:#d08b2c;stroke-dasharray:5 5;animation:fg-flow .5s linear infinite}
.fg-new{fill:none;stroke:var(--ink);stroke-width:4;stroke-dasharray:4 4}
@keyframes fg-flow{to{stroke-dashoffset:-16}}
.fg-weld circle{fill:var(--white);stroke:var(--rust);stroke-width:2}
.fg-weld path{stroke:var(--rust);stroke-width:2}
.fg-vbody{fill:var(--white);stroke:var(--ink);stroke-width:1.6;stroke-linejoin:round;transition:fill .25s}
.fg-stem{fill:none;stroke:var(--ink);stroke-width:1.6}
.fg-valve.is-closed .fg-vbody{fill:var(--ink)}
.fg-valve.is-open .fg-vbody{fill:#d08b2c}
.fg-valve:hover .fg-vbody,.fg-valve:focus-visible .fg-vbody,.fg-spade:hover .fg-flange,.fg-spade:focus-visible .fg-flange{stroke:var(--rust-text);stroke-width:2.4}
.fg-flange{fill:none;stroke:var(--ink);stroke-width:2}
.fg-blind,.fg-handle{opacity:0;transition:opacity .3s,transform .4s}
.fg-blind{fill:var(--ink);transform:translateY(-14px)}
.fg-handle{fill:none;stroke:var(--ink);stroke-width:2}
.fg-spade.is-fitted .fg-blind,.fg-spade.is-fitted .fg-handle{opacity:1;transform:none}
.is-hint{animation:fg-hint 1s ease-in-out infinite}
.is-hint .fg-vbody,.is-hint .fg-flange,.is-hint .fg-nut,.is-hint .fg-washer{stroke:var(--rust)!important;stroke-width:2.6!important}
@keyframes fg-hint{50%{opacity:.55}}

/* Align */
.fg-stepper{display:flex;margin:0 0 8px;padding:0;list-style:none;border:1px solid var(--ink);background:var(--white)}
.fg-stepper li{flex:1;display:flex;align-items:center;gap:6px;padding:6px 8px;border-right:1px solid var(--line);color:var(--soft);font:700 10px/1.2 var(--font-mono);letter-spacing:.06em;text-transform:uppercase}
.fg-stepper li:last-child{border-right:0}
.fg-stepper small{display:grid;place-items:center;width:17px;height:17px;border:1px solid currentColor;border-radius:50%;font-size:9px}
.fg-stepper li.is-done{color:var(--ink)}
.fg-stepper li.is-done small{background:var(--ink);color:var(--white)}
.fg-stepper li.is-now{background:#f0e6dc;color:var(--rust-text);box-shadow:inset 0 -3px 0 var(--rust)}
.fg-grp{display:inline-block;color:var(--soft);font:var(--t-label)/1 var(--font-mono);letter-spacing:.06em;text-transform:uppercase}
.fg-stage-align .fg-side{grid-template-columns:1fr}
.fg-stage-align .fg-actions{flex-direction:column;align-items:flex-start}
.fg-row{display:flex;flex-wrap:wrap;align-items:center;gap:6px}
.fg-grp{width:92px}
.fg-pack{margin-left:4px;color:#8a6a24;font:700 var(--t-label)/1 var(--font-mono)}
.fg-stage-align .fg-actions>.fg-btn{align-self:flex-start}
.fg-read .ok{color:#3f6b52}.fg-read .bad{color:var(--rust-text)}
.fg-read dd span{font:600 13px/1.2 var(--font-mono);letter-spacing:0}
.fg-base{fill:#c9c3b6;stroke:var(--ink);stroke-width:1.2}
.fg-pad{fill:#8f9993;stroke:var(--ink);stroke-width:1}
.fg-shim{fill:#c9a24a;stroke:#6b5420;stroke-width:.8}
.fg-foot{fill:#6b7570;stroke:var(--ink);stroke-width:1}
.fg-pumpbody,.fg-volute{fill:#5f7f93;stroke:var(--ink);stroke-width:1.2}
.fg-eye{fill:#47657a;stroke:var(--ink);stroke-width:1}
.fg-flg{fill:#4c6a7d;stroke:var(--ink);stroke-width:1}
.fg-bearing{fill:#6f8ea0;stroke:var(--ink);stroke-width:1.1}
.fg-shaft{fill:#c4cbc6;stroke:var(--ink);stroke-width:1}
.fg-hub{fill:#e0ae3a;stroke:var(--ink);stroke-width:1.1}
.fg-motorbody{fill:#5d7d6c;stroke:var(--ink);stroke-width:1.2}
.fg-fins{fill:none;stroke:#3f5a4c;stroke-width:1.4}
.fg-tbox{fill:#4c6a5b;stroke:var(--ink);stroke-width:1}
.fg-laser rect{fill:#2b302d;stroke:var(--ink);stroke-width:1}
.fg-lens{fill:#ff5436}
.fg-beam{fill:none;stroke:#ff5436;stroke-width:1.6;stroke-dasharray:4 2;animation:fg-flow .5s linear infinite}
.fg-cl{fill:none;stroke:var(--rust);stroke-width:.8;stroke-dasharray:10 4 2 4}
.fg-footpl{fill:#6b7570;stroke:var(--ink);stroke-width:1.2}
.fg-boltc{fill:#c4cbc6;stroke:var(--ink);stroke-width:1}
.fg-mfoot[role="button"]{cursor:pointer;outline:none}
.fg-mfoot:hover .fg-footpl,.fg-mfoot:focus-visible .fg-footpl,.fg-mfoot.is-sel .fg-footpl{stroke:var(--rust-text);stroke-width:2.6}
.fg-mfoot.is-read .fg-boltc{fill:#9fc3a9}
.fg-mfoot.is-soft .fg-boltc{fill:var(--rust)}
.fg-mfoot.is-soft .fg-tag{fill:var(--rust-text)}
.fg-jack{fill:none;stroke:var(--rust);stroke-width:2}
.fg-align .fg-label{text-anchor:middle}
/* Bolt up */
.fg-fl-outer{fill:#c9ccc6;stroke:var(--ink);stroke-width:1.4}
.fg-fl-face{fill:#dfe2dc;stroke:var(--ink);stroke-width:1}
.fg-gasket{fill:none;stroke:#4b524e;stroke-width:14;opacity:.85}
.fg-bore{fill:var(--white);stroke:var(--ink);stroke-width:1.2}
.fg-ring{fill:none;stroke:var(--rust);stroke-width:4;stroke-dasharray:1 2;stroke-dashoffset:var(--fill,1);transform:rotate(-90deg);transition:stroke-dashoffset .3s}
.fg-washer{fill:#d9dcd6;stroke:#5b605b;stroke-width:1}
.fg-nut{fill:#7d8781;stroke:#1f2624;stroke-width:1.4;stroke-linejoin:round;transition:fill .2s}
.fg-nut-lit{fill:#a3aca6;opacity:.55;pointer-events:none}
.fg-chamfer{fill:none;stroke:#2b302d;stroke-width:.8;opacity:.55}
.fg-studend{fill:#9aa39c;stroke:#2b302d;stroke-width:1.1}
.fg-thread{fill:none;stroke:#2b302d;stroke-width:.8;stroke-dasharray:2 1.5;opacity:.7}
.fg-bolt.is-on .fg-nut{fill:#3b4440}
.fg-bolt.is-on .fg-studend{fill:#c4cbc6}
.fg-bolt.is-check .fg-ring{stroke:#61786d;stroke-width:6}
.fg-bolt:hover .fg-nut,.fg-bolt:focus-visible .fg-nut{stroke:var(--rust-text);stroke-width:2.6}
.fg-bno{fill:var(--ink);font:700 10px var(--font-mono);text-anchor:middle;pointer-events:none}
.fg-plate{fill:#b9c1be;stroke:var(--ink);stroke-width:1.2}
.fg-gk{fill:#4b524e;transition:y .35s,height .35s}
.fg-stud{fill:#8f9993;stroke:#2b302d;stroke-width:1}
.fg-threads{fill:none;stroke:#2b302d;stroke-width:.7;opacity:.6}
.fg-hexbody{fill:#7d8781;stroke:#1f2624;stroke-width:1.3}
.fg-hexface{fill:none;stroke:#1f2624;stroke-width:.9}
.fg-hexcham{fill:none;stroke:#1f2624;stroke-width:.9}
.fg-top{transition:transform .35s cubic-bezier(.2,.8,.2,1)}
.fg-passes{display:flex;gap:4px}
.fg-passes span{padding:6px 8px;border:1px solid #8c938a;background:var(--white);color:var(--soft);font:700 10px/1 var(--font-mono);letter-spacing:.06em;text-transform:uppercase}
.fg-passes .is-done{border-color:var(--ink);background:var(--ink);color:var(--white)}
.fg-passes .is-now{border-color:var(--rust);color:var(--rust-text);box-shadow:inset 0 -3px 0 var(--rust)}

/* Night shift */
:root[data-night-shift="true"] .fg-steps{background:#22322c;border-color:#53635c}
:root[data-night-shift="true"] .fg-svg{background:#1c2925}
:root[data-night-shift="true"] .fg-fl-outer{fill:#55625c}
:root[data-night-shift="true"] .fg-fl-face{fill:#6a7771}
:root[data-night-shift="true"] .fg-plate{fill:#55625c}

@media(max-width:620px){
 .fg-tabs button{padding:9px 8px;font-size:11px}
 .fg-side{grid-template-columns:1fr}
 .fg-stepper li{font-size:0;gap:0;justify-content:center}
 .fg-stepper li.is-now{font-size:9px;gap:4px}
 .fg-stamp{top:auto;bottom:40px}
}
@media(prefers-reduced-motion:reduce){.fg-line.live,.fg-line.purging,.fg-line.side.flowing,.is-hint{animation:none}.fg-stamp.is-on,.fg-top,.fg-ring{transition:none}}
@media print{.fg{display:none}}
#fg-align .fg-stamp{top:96px}
.fg-straight{fill:none;stroke:var(--rust);stroke-width:3;stroke-linecap:round}

/* Soft foot guide + dial indicator */
.fg-guide{margin-top:10px;border:1px solid #8c938a;background:var(--white)}
.fg-guide summary{padding:8px 12px;color:var(--rust-text);font:700 var(--t-label)/1.2 var(--font-mono);letter-spacing:.1em;text-transform:uppercase;cursor:pointer}
.fg-howto{margin:0;padding:0 14px 8px 32px;color:var(--ink);font:var(--t-note)/1.5 var(--font-body)}
.fg-howto li{margin:2px 0}
.fg-howto li::marker{color:var(--rust-text);font:700 11px var(--font-mono)}
.fg-types{margin:0 12px 12px;border:1px solid var(--line)}
.fg-types>div{display:grid;grid-template-columns:86px 1fr 1fr;gap:8px;padding:6px 8px;border-top:1px dashed var(--line);font:var(--t-note)/1.35 var(--font-body);color:var(--soft)}
.fg-types>div:first-child{border-top:0}
.fg-types b{color:var(--ink);font:700 var(--t-label)/1.35 var(--font-mono);letter-spacing:.06em;text-transform:uppercase}
.fg-types-head span{color:var(--rust-text);font:700 10px/1.2 var(--font-mono);letter-spacing:.08em;text-transform:uppercase}
.fg-dialarm{fill:none;stroke:#5b605b;stroke-width:2.5}
.fg-dialface{fill:var(--white);stroke:var(--ink);stroke-width:1.6}
.fg-dialticks{fill:none;stroke:var(--ink);stroke-width:.9}
.fg-needle{fill:none;stroke:var(--ink);stroke-width:1.8;stroke-linecap:round}
.fg-dial.is-high .fg-needle{stroke:#c0392b}
.fg-dialhub{fill:var(--ink)}
.fg-dialread{fill:var(--ink);font:700 9px var(--font-mono);text-anchor:middle}
.fg-dial.is-high .fg-dialread{fill:var(--rust-text)}
@media(max-width:620px){.fg-types>div{grid-template-columns:1fr}.fg-types-head{display:none!important}}
/* Stress-test fixes: readable number on the selected tab; tabs fit 320px phones. */
.fg-tabs button[aria-selected="true"] small{color:inherit;opacity:.72}
.fg-tabs button{min-width:0}
@media(max-width:380px){.fg-tabs button{gap:4px;padding:9px 5px;letter-spacing:.03em}.fg-tabs small{font-size:9px}.fg-tabs i{width:11px;height:11px}}