*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--bg:#030508;--panel:#080c14;--border:#1a2a3a;--c1:#ff4422;--c2:#00e5ff;--c3:#39ff14;--amber:#f0a500;--dim:#2a4050;--t:#8ab4c8;--bright:#d0e8f0}
html,body{width:100%;height:100%;background:var(--bg);color:var(--t);font-family:ui-monospace, "SF Mono", Menlo, Consolas, monospace,monospace;overflow:hidden}
canvas{display:block}
.screen{position:fixed;inset:0;display:flex;flex-direction:column}
.hidden{display:none!important}

/* ── MENU ── */
#s-menu{align-items:center;justify-content:center;background:radial-gradient(ellipse at 50% 30%,#0a0408 0%,#030508 100%)}
.m-title{font-family:"Arial Black", "Helvetica Neue", system-ui, sans-serif,monospace;font-size:2.8rem;font-weight:900;letter-spacing:.1em;color:var(--c1);text-shadow:0 0 30px rgba(255,68,34,.5),0 0 60px rgba(255,68,34,.2);animation:titlePulse 3s ease-in-out infinite}
@keyframes titlePulse{0%,100%{text-shadow:0 0 20px rgba(255,68,34,.4)}50%{text-shadow:0 0 50px rgba(255,68,34,.8),0 0 100px rgba(255,68,34,.3)}}
.m-sub{font-size:.75rem;letter-spacing:.3em;color:var(--dim);margin:.4rem 0 2.5rem}
.m-inner{display:flex;flex-direction:column;align-items:center;gap:.8rem;max-width:800px;width:100%;padding:1.5rem}

/* Car selector */
.car-grid{display:flex;gap:.7rem;flex-wrap:wrap;justify-content:center;margin-bottom:1rem}
.car-card{width:130px;background:var(--panel);border:1px solid var(--border);padding:.8rem .6rem;cursor:pointer;transition:all .2s;text-align:center;position:relative;clip-path:polygon(8px 0%,100% 0%,100% calc(100% - 8px),calc(100% - 8px) 100%,0% 100%,0% 8px)}
.car-card:hover{border-color:var(--c1);background:rgba(255,68,34,.06)}
.car-card.sel{border-color:var(--c1);background:rgba(255,68,34,.1);box-shadow:0 0 15px rgba(255,68,34,.2)}
.car-emoji{font-size:2rem;margin-bottom:.35rem}
.car-name{font-family:"Arial Black", "Helvetica Neue", system-ui, sans-serif,monospace;font-size:.58rem;letter-spacing:.08em;color:var(--bright);margin-bottom:.5rem}
.car-bar{height:3px;background:var(--border);border-radius:2px;margin:.18rem 0;overflow:hidden}
.car-bar-fill{height:100%;border-radius:2px;transition:width .3s}
.car-stat-lbl{font-size:.48rem;letter-spacing:.1em;color:var(--dim);display:flex;justify-content:space-between}

/* Mode buttons */
.mode-btns{display:flex;gap:.8rem}
.m-btn{padding:.85rem 1.8rem;font-family:"Arial Black", "Helvetica Neue", system-ui, sans-serif,monospace;font-size:.82rem;letter-spacing:.12em;border:2px solid var(--c1);background:rgba(255,68,34,.07);color:var(--c1);cursor:pointer;transition:all .2s;clip-path:polygon(10px 0%,100% 0%,100% calc(100% - 10px),calc(100% - 10px) 100%,0% 100%,0% 10px)}
.m-btn:hover{background:var(--c1);color:#000;box-shadow:0 0 20px rgba(255,68,34,.4)}
.m-btn.ai-btn{border-color:var(--c2);background:rgba(0,229,255,.06);color:var(--c2)}
.m-btn.ai-btn:hover{background:var(--c2);color:#000;box-shadow:0 0 20px rgba(0,229,255,.4)}
.m-regen{padding:.45rem 1rem;font-family:ui-monospace, "SF Mono", Menlo, Consolas, monospace,monospace;font-size:.65rem;letter-spacing:.1em;border:1px solid var(--border);background:transparent;color:var(--dim);cursor:pointer;transition:all .2s}
.m-regen:hover{border-color:var(--c2);color:var(--c2)}

/* ── HUD ── */
#hud{position:absolute;top:0;left:0;right:0;z-index:10;pointer-events:none;display:flex;align-items:flex-start;justify-content:space-between;padding:.6rem .9rem}
.hud-left,.hud-right{display:flex;flex-direction:column;gap:.3rem}
.hud-box{background:rgba(3,5,8,.8);border:1px solid var(--border);padding:.35rem .6rem;backdrop-filter:blur(6px);min-width:120px}
.hud-lbl{font-size:.5rem;letter-spacing:.18em;text-transform:uppercase;color:var(--dim);margin-bottom:.18rem}
.hud-val{font-family:"Arial Black", "Helvetica Neue", system-ui, sans-serif,monospace;font-size:1rem;font-weight:700;color:var(--c1);line-height:1}
.hud-val.blue{color:var(--c2)}.hud-val.green{color:var(--c3)}.hud-val.amber{color:var(--amber)}
.hud-val.small{font-size:.72rem}
.hud-center{position:absolute;top:.6rem;left:50%;transform:translateX(-50%);text-align:center}
.lap-counter{font-family:"Arial Black", "Helvetica Neue", system-ui, sans-serif,monospace;font-size:.75rem;letter-spacing:.18em;color:var(--bright);background:rgba(3,5,8,.8);padding:.28rem .7rem;border:1px solid var(--border)}
.item-flash{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-family:"Arial Black", "Helvetica Neue", system-ui, sans-serif,monospace;font-size:1.4rem;font-weight:700;letter-spacing:.1em;pointer-events:none;opacity:0;transition:opacity .3s;text-shadow:0 0 20px currentColor}
.item-flash.show{opacity:1}
.item-flash.good{color:var(--c3)}.item-flash.bad{color:var(--c1)}

/* AI panel */
.ai-hud{position:absolute;right:.9rem;top:3rem;background:rgba(3,5,8,.88);border:1px solid rgba(0,229,255,.2);padding:.6rem .8rem;min-width:180px;backdrop-filter:blur(6px)}
.ai-hud-title{font-size:.52rem;letter-spacing:.2em;color:var(--c2);margin-bottom:.5rem}
.ai-gen-row{display:flex;justify-content:space-between;font-size:.6rem;color:var(--t);margin-bottom:.25rem}
.ai-gen-val{color:var(--c2);font-family:"Arial Black", "Helvetica Neue", system-ui, sans-serif,monospace}
.ai-car-list{display:flex;flex-direction:column;gap:.18rem;margin-top:.4rem;max-height:160px;overflow:hidden}
.ai-car-row{display:flex;align-items:center;gap:.4rem;font-size:.58rem}
.ai-car-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}
.ai-fit-bar{flex:1;height:3px;background:var(--border);border-radius:2px;overflow:hidden}
.ai-fit-fill{height:100%;border-radius:2px;background:var(--c2);transition:width .4s}
.ai-nn-viz{width:100%;height:50px;margin-top:.5rem;border:1px solid rgba(0,229,255,.1);border-radius:2px}
.nn-canvas{width:100%;height:100%}
/* v3 — Ligne niveau */
.ai-level-row{padding-bottom:.32rem;border-bottom:1px solid rgba(120,180,255,.15);margin-bottom:.35rem}
.ai-level-val{font-size:.62rem;letter-spacing:.05em;transition:color .35s}

/* v2 — Sparkline fitness + boutons brain */
.ai-fit-spark{margin-top:.55rem}
.ai-spark-lbl{font-size:.5rem;letter-spacing:.16em;color:var(--c2);opacity:.7;margin-bottom:.2rem}
.fit-spark{display:block;width:100%;height:32px;border:1px solid rgba(0,229,255,.1);border-radius:2px;background:rgba(0,229,255,.02)}
.ai-brain-btns{display:flex;gap:.3rem;margin-top:.45rem}
.ai-brain-btn{flex:1;background:rgba(0,229,255,.08);border:1px solid rgba(0,229,255,.25);color:var(--c2);font-family:inherit;font-size:.55rem;letter-spacing:.05em;padding:.3rem .25rem;cursor:pointer;border-radius:2px;transition:background .15s}
.ai-brain-btn:hover{background:rgba(0,229,255,.2)}
.ai-brain-btn:active{transform:translateY(1px)}

/* Minimap */
.minimap{position:absolute;bottom:.9rem;right:.9rem;background:rgba(3,5,8,.85);border:1px solid var(--border);padding:.3rem;border-radius:2px}
.minimap canvas{display:block}

/* Controls hint */
.ctrl-hint{position:absolute;bottom:.9rem;left:.9rem;font-size:.55rem;letter-spacing:.1em;color:var(--dim);line-height:1.8;background:rgba(3,5,8,.8);padding:.4rem .6rem;border:1px solid var(--border)}
.key{color:var(--c2);font-family:"Arial Black", "Helvetica Neue", system-ui, sans-serif,monospace}

/* Game over / pause */
.overlay-modal{position:absolute;inset:0;background:rgba(0,0,0,.7);display:flex;align-items:center;justify-content:center;z-index:30;backdrop-filter:blur(4px)}
.o-box{background:var(--panel);border:1px solid var(--border);border-top:2px solid var(--c1);padding:2rem 2.5rem;text-align:center;min-width:320px}
.o-title{font-family:"Arial Black", "Helvetica Neue", system-ui, sans-serif,monospace;font-size:1.4rem;font-weight:900;letter-spacing:.1em;color:var(--c1);margin-bottom:.4rem}
.o-sub{color:var(--t);font-size:.8rem;margin-bottom:1.5rem;line-height:1.8}
.o-btns{display:flex;gap:.6rem;justify-content:center}
.o-btn{padding:.55rem 1.3rem;font-family:"Arial Black", "Helvetica Neue", system-ui, sans-serif,monospace;font-size:.72rem;letter-spacing:.1em;border:1px solid;cursor:pointer;transition:all .18s;clip-path:polygon(7px 0%,100% 0%,100% calc(100% - 7px),calc(100% - 7px) 100%,0% 100%,0% 7px)}
.o-btn.pri{border-color:var(--c1);color:var(--c1);background:rgba(255,68,34,.06)}.o-btn.pri:hover{background:var(--c1);color:#000}
.o-btn.sec{border-color:var(--border);color:var(--dim);background:transparent}.o-btn.sec:hover{border-color:var(--t);color:var(--t)}
.o-stat{display:flex;justify-content:space-between;font-size:.72rem;margin:.3rem 0;padding:.25rem 0;border-bottom:1px solid rgba(255,255,255,.05)}
.o-stat span{color:var(--c1);font-family:"Arial Black", "Helvetica Neue", system-ui, sans-serif,monospace}

/* Item icons on track rendered via canvas */
/* Speed bar */
.speed-arc{position:absolute;bottom:4.5rem;left:50%;transform:translateX(-50%);text-align:center}

/* Retour menu — bouton flottant top-left */
.back-to-menu{position:fixed;top:.7rem;left:.7rem;z-index:9999;background:rgba(4,7,15,.85);color:#5dd4f7;border:1px solid rgba(93,212,247,.35);padding:.5rem .85rem;border-radius:8px;font-size:.78rem;font-family:system-ui,-apple-system,"Segoe UI",sans-serif;text-decoration:none;letter-spacing:.02em;backdrop-filter:blur(6px);transition:background .15s,border-color .15s,transform .12s}
.back-to-menu:hover,.back-to-menu:focus-visible{background:rgba(93,212,247,.2);border-color:#5dd4f7;outline:none}
.back-to-menu:active{transform:translateY(1px)}
@media (max-width:600px){
  .back-to-menu{font-size:.7rem;padding:.4rem .65rem;top:.4rem;left:.4rem}
}