/* Usine IA: a night factory floor. Hazard yellow is the one loud colour; everything else stays calm. */
:root{
  --floor:#0e2730; --plate:#163843; --rail:#24525f; --chalk:#f3f1e8; --dust:#9db4b9;
  --hazard:#ffcc33; --ok:#7fd6b0; --ko:#e2683c; --steel:#5d7d86;
  --sign:'Bungee','Arial Black',system-ui,sans-serif; --text:'Lexend',system-ui,sans-serif;
  color-scheme:dark
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--floor);color:var(--chalk);font:17px/1.45 var(--text);-webkit-tap-highlight-color:transparent}
body{min-height:100vh;padding-bottom:env(safe-area-inset-bottom,0)}
button{font:inherit;color:inherit;border:0;cursor:pointer;background:none}
button:focus-visible,a:focus-visible{outline:3px solid var(--hazard);outline-offset:2px}
a{color:var(--hazard)}

.bar{position:sticky;top:0;z-index:5;display:flex;align-items:center;gap:12px;padding:calc(10px + env(safe-area-inset-top,0)) 16px 10px;
  background:linear-gradient(var(--floor) 70%,transparent)}
.bar .who{display:flex;flex-direction:column;line-height:1.1}
.bar .who b{font:400 15px var(--sign);color:var(--hazard)}
.bar .who span{font-size:13px;color:var(--dust)}
.bar .stars{margin-left:auto;font-weight:700;color:var(--hazard)}
.ghost{font-size:24px;padding:4px 8px;border-radius:10px;background:var(--plate)}

main{max-width:560px;margin:0 auto;padding:6px 16px 40px}
h1,h2{font-family:var(--sign);font-weight:400;letter-spacing:.01em;margin:8px 0 6px}
h1{font-size:30px;line-height:1.05}
h2{font-size:22px}
.lead{color:var(--dust);margin:0 0 18px}

/* the factory map: workshops along a belt */
.belt{position:relative;margin:18px 0 0;padding-left:34px}
.belt::before{content:'';position:absolute;left:14px;top:8px;bottom:8px;width:6px;border-radius:3px;
  background:repeating-linear-gradient(180deg,var(--rail) 0 10px,#1b4450 10px 20px);animation:roll 1.6s linear infinite}
@keyframes roll{to{background-position:0 20px}}
@media (prefers-reduced-motion:reduce){.belt::before{animation:none}}
.shop{position:relative;display:flex;gap:14px;align-items:center;width:100%;text-align:left;background:var(--plate);
  border-radius:16px;padding:14px 16px;margin:0 0 12px}
.shop::before{content:'';position:absolute;left:-26px;top:50%;width:14px;height:14px;margin-top:-7px;border-radius:50%;
  background:var(--floor);border:3px solid var(--rail)}
.shop.done::before{background:var(--ok);border-color:var(--ok)}
.shop.open::before{background:var(--hazard);border-color:var(--hazard)}
.shop .ico{font-size:34px;width:46px;text-align:center}
.shop b{display:block;font:400 18px var(--sign)}
.shop small{color:var(--dust)}
.shop .st{margin-left:auto;color:var(--hazard);white-space:nowrap;font-weight:700}
.shop.locked{opacity:.45}
.shop.locked .st{color:var(--dust)}

/* machines inside a workshop */
.machines{display:grid;gap:10px;margin-top:14px}
.machine{display:flex;align-items:center;gap:12px;background:var(--plate);border-radius:14px;padding:13px 15px;text-align:left}
.machine .n{font:400 20px var(--sign);color:var(--steel);width:28px}
.machine.boss{border:2px dashed var(--hazard)}
.machine.boss .n{color:var(--hazard)}
.machine .st{margin-left:auto;color:var(--hazard);letter-spacing:2px}
.machine.locked{opacity:.4}
.machine .ty{display:block;font-size:13px;color:var(--dust)}

/* concept card */
.card{background:var(--chalk);color:#14262c;border-radius:20px;padding:22px 20px;margin:12px 0;box-shadow:0 8px 0 #0a1d24}
.card .tag{font:400 13px var(--sign);color:#8a6a00;background:var(--hazard);display:inline-block;padding:2px 8px;border-radius:6px}
.card h2{color:#14262c;margin-top:10px}
.card p{margin:8px 0 0;font-size:18px}
.card pre{white-space:pre-wrap;font:600 15px/1.4 ui-monospace,Consolas,monospace;background:#e3e0d3;border-radius:10px;padding:10px;margin:12px 0 0}
.src{display:inline-flex;gap:6px;align-items:center;margin-top:12px;font-size:14px;color:#245a68;text-decoration:none;
  border-bottom:1px dashed currentColor}
.src.dark{color:var(--dust)}

.go{display:block;width:100%;margin-top:16px;padding:16px;border-radius:14px;background:var(--hazard);color:#1d1600;
  font:400 20px var(--sign);box-shadow:0 5px 0 #b38f1a}
.go:active{transform:translateY(3px);box-shadow:0 2px 0 #b38f1a}
.go.alt{background:var(--plate);color:var(--chalk);box-shadow:0 5px 0 #0a1d24}

/* challenge area */
.hud{display:flex;justify-content:space-between;align-items:center;color:var(--dust);font-size:14px;margin:10px 0}
.pips{display:flex;gap:5px}.pips i{width:22px;height:6px;border-radius:3px;background:var(--rail)}
.pips i.ok{background:var(--ok)}.pips i.ko{background:var(--ko)}.pips i.cur{background:var(--hazard)}
.q{font-size:21px;font-weight:600;margin:6px 0 14px}
.choices{display:grid;gap:10px}
.choice{text-align:left;padding:15px 16px;border-radius:14px;background:var(--plate);font-size:17px;border:2px solid transparent}
.choice.ok{border-color:var(--ok);background:#1d4a45}.choice.ko{border-color:var(--ko);background:#4a2b25}
.choice[disabled]{cursor:default}
.why{margin-top:14px;padding:12px 14px;border-radius:12px;background:#0b2128;border-left:4px solid var(--ok)}
.why.bad{border-left-color:var(--ko)}
.why b{display:block;margin-bottom:2px}
.timer{height:8px;border-radius:4px;background:var(--rail);overflow:hidden;margin:4px 0 14px}
.timer i{display:block;height:100%;background:var(--hazard);transition:width linear}
.vf{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.vf button{padding:22px;border-radius:16px;font:400 22px var(--sign)}
.vf .v{background:#1d4a45}.vf .f{background:#4a2b25}

.bins{display:grid;gap:10px;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));margin-top:14px}
.bin{padding:18px 10px;border-radius:14px;background:var(--plate);border:2px dashed var(--rail);font-weight:700}
.bin .c{display:block;font-size:13px;color:var(--dust);font-weight:400}
.item{background:var(--chalk);color:#14262c;border-radius:14px;padding:16px;font-size:19px;font-weight:600;text-align:center;
  box-shadow:0 6px 0 #0a1d24;animation:drop .25s ease-out}
@keyframes drop{from{transform:translateY(-14px);opacity:0}}

.chain{display:grid;gap:8px;margin:10px 0}
.slot{min-height:50px;border-radius:12px;border:2px dashed var(--rail);padding:12px 14px;display:flex;gap:10px;align-items:center;color:var(--dust)}
.slot.full{border-style:solid;border-color:var(--hazard);color:var(--chalk);background:var(--plate)}
.slot b{font-family:var(--sign);font-weight:400;color:var(--hazard)}
.pool{display:grid;gap:8px;margin-top:12px}
.pool button{text-align:left;padding:13px 14px;border-radius:12px;background:var(--plate)}
.shake{animation:shake .3s}
@keyframes shake{25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}

.gauge{height:34px;border-radius:10px;background:var(--rail);overflow:hidden;display:flex;margin:8px 0 2px;position:relative}
.gauge i{display:block;height:100%;border-right:2px solid var(--floor);transition:width .2s}
.gauge.over{outline:3px solid var(--ko)}
.gauge-meta{display:flex;justify-content:space-between;font-size:14px;color:var(--dust)}
.chips{display:grid;gap:8px;margin-top:12px}
.chip{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:12px 14px;border-radius:12px;background:var(--plate);text-align:left}
.chip.in{outline:2px solid var(--hazard)}
.chip small{color:var(--dust);white-space:nowrap}

.result{text-align:center;padding-top:20px}
.result .big{font-size:58px;color:var(--hazard);letter-spacing:6px}
.result .xp{font:400 22px var(--sign);color:var(--ok)}
.sources{text-align:left;margin-top:22px;font-size:14px;color:var(--dust)}
.sources a{display:block;margin:6px 0;color:var(--dust)}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:var(--hazard);color:#1d1600;padding:10px 16px;
  border-radius:12px;font-weight:700;animation:drop .25s}

/* ---- account ---- */
.acct{font-size:14px;padding:6px 10px;border-radius:10px;background:var(--plate);color:var(--chalk);max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.tabs{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:14px 0}
.tabs button{padding:12px;border-radius:12px;background:var(--plate);font-weight:700}
.tabs button.on{background:var(--hazard);color:#1d1600}
.field{display:block;margin:12px 0}
.field span{display:block;font-size:14px;color:var(--dust);margin-bottom:4px}
.field input{width:100%;font:inherit;font-size:18px;padding:13px 14px;border-radius:12px;border:2px solid var(--rail);background:#0b2128;color:var(--chalk)}
.field input:focus{outline:none;border-color:var(--hazard)}
.err{color:var(--ko);min-height:1.3em;margin:8px 0 0}
.skip{display:block;margin:16px auto 0;color:var(--dust);text-decoration:underline;font-size:15px}
.sync{font-size:12px;color:var(--dust);text-align:center;margin-top:18px}

/* ---- animations (all off under reduced motion) ---- */
.shop,.machine{animation:slidein .45s cubic-bezier(.2,.9,.3,1.2) both}
@keyframes slidein{from{opacity:0;transform:translateX(30px)}}
.result .big span{display:inline-block;animation:pop .5s cubic-bezier(.2,1.6,.4,1) both}
.result .big span.off{color:var(--rail)}
@keyframes pop{0%{transform:scale(0) rotate(-40deg);opacity:0}70%{transform:scale(1.35) rotate(8deg)}100%{transform:none;opacity:1}}
.choice.ok,.bin.ok{animation:goodpulse .5s}
@keyframes goodpulse{40%{transform:scale(1.04);box-shadow:0 0 0 6px #7fd6b044}}
.promo{position:fixed;left:50%;top:18%;transform:translateX(-50%);z-index:20;background:var(--hazard);color:#1d1600;padding:16px 22px;border-radius:16px;
  font:400 22px var(--sign);text-align:center;box-shadow:0 8px 0 #b38f1a;animation:promo 2.8s ease both}
@keyframes promo{0%{transform:translate(-50%,-40px) scale(.6);opacity:0}15%{transform:translate(-50%,0) scale(1.08);opacity:1}25%{transform:translate(-50%,0) scale(1)}85%{opacity:1}100%{opacity:0;transform:translate(-50%,-20px)}}
.confetti{position:fixed;inset:0;pointer-events:none;z-index:15;overflow:hidden}
.confetti i{position:absolute;top:-12px;width:9px;height:14px;border-radius:2px;animation:fall linear forwards}
@keyframes fall{to{transform:translateY(105vh) rotate(720deg)}}
.machine-run{display:flex;justify-content:center;gap:10px;font-size:30px;margin:6px 0 2px}
.machine-run i{font-style:normal;animation:gear 1.2s linear infinite}
.machine-run i:nth-child(2){animation-direction:reverse}
@keyframes gear{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}.confetti{display:none}}

/* ---- listen first: audio lesson + read aloud ---- */
.lesson{display:flex;gap:14px;align-items:center;background:linear-gradient(135deg,#1d4a45,var(--plate));border-radius:16px;padding:14px 16px;margin:6px 0 4px}
.lesson button{flex:none;width:56px;height:56px;border-radius:50%;background:var(--hazard);color:#1d1600;font-size:22px;box-shadow:0 4px 0 #b38f1a}
.lesson div{flex:1;min-width:0}
.lesson b{display:block;font:400 17px var(--sign)}
.lesson small{color:var(--dust);font-size:13px}
.lbar{height:6px;border-radius:3px;background:var(--rail);margin-top:8px;overflow:hidden}
.lbar i{display:block;height:100%;width:0;background:var(--hazard)}
.say{font-size:20px;padding:2px 8px;border-radius:10px;background:var(--plate);vertical-align:middle;margin-left:4px}
.item .say{background:#e3e0d3}
.lt{display:inline-block;min-width:24px;color:var(--hazard);font-family:var(--sign);font-weight:400}

/* ---- surprise: the mystery machine ---- */
.surprise{display:flex;gap:14px;align-items:center;width:100%;text-align:left;margin:4px 0 16px;padding:14px 16px;border-radius:16px;
  background:repeating-linear-gradient(135deg,#2a2410 0 14px,#332b12 14px 28px);border:2px solid var(--hazard)}
.surprise .dice{font-size:34px;display:inline-block;animation:wobble 2.4s ease-in-out infinite}
@keyframes wobble{0%,70%,100%{transform:rotate(0)}80%{transform:rotate(-14deg)}90%{transform:rotate(12deg)}}
.surprise b{display:block;font:400 17px var(--sign);color:var(--hazard)}
.surprise small{color:var(--dust)}
.combo{color:var(--hazard);font-weight:700}