:root{
    --bg:#05060a; --neon:#25e2ff; --hot:#ff2f9a; --text:#dff2f8;
    --dim:rgba(223,242,248,.45); --dim2:rgba(223,242,248,.28); --amber:#ffc24a;
    --glass:rgba(8,12,20,.82); --line:rgba(37,226,255,.26);
  }
  *{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
  html,body{margin:0;height:100%;overflow:hidden;background:var(--bg);color:var(--text);
    font-family:ui-sans-serif,system-ui,"Helvetica Neue",Arial,sans-serif;
    touch-action:none;overscroll-behavior:none;user-select:none;-webkit-user-select:none}
  canvas{display:block;position:fixed;top:0;left:0;width:100%;height:100%}
  button{font-family:inherit}

  /* barres de défilement : la version standard d'abord, la version WebKit ensuite
     pour Safari et les navigateurs Chromium qui ne suivent pas encore la première */
  .modal, .sheet .body{scrollbar-width:thin;scrollbar-color:rgba(37,226,255,.45) transparent}
  .modal::-webkit-scrollbar, .sheet .body::-webkit-scrollbar{width:11px;height:11px}
  /* la marge du rail recule les butées, le curseur ne peut plus déborder
     des angles arrondis de la modale */
  .modal::-webkit-scrollbar-track{background:rgba(223,242,248,.05);border-radius:4px;margin:18px 0}
  .sheet .body::-webkit-scrollbar-track{background:rgba(223,242,248,.05);border-radius:4px;margin:10px 0}
  /* bordure transparente plus découpe sur la boîte de contenu : marge latérale
     sans repeindre le rail */
  .modal::-webkit-scrollbar-thumb, .sheet .body::-webkit-scrollbar-thumb{
    background:linear-gradient(rgba(37,226,255,.60),rgba(37,226,255,.32));
    background-clip:content-box;border:2px solid transparent;border-radius:6px}
  .modal::-webkit-scrollbar-thumb:hover, .sheet .body::-webkit-scrollbar-thumb:hover{
    background:linear-gradient(rgba(37,226,255,.90),rgba(255,47,154,.60));
    background-clip:content-box}
  .modal::-webkit-scrollbar-thumb:active, .sheet .body::-webkit-scrollbar-thumb:active{
    background:linear-gradient(#25e2ff,#ff2f9a);background-clip:content-box}
  .modal::-webkit-scrollbar-corner, .sheet .body::-webkit-scrollbar-corner{background:transparent}

  .layer{position:fixed;inset:0;z-index:20;display:flex;align-items:center;justify-content:center;
    opacity:0;pointer-events:none;transition:opacity .22s ease}
  .layer.on{opacity:1;pointer-events:auto}
  .scrim{position:absolute;inset:0;background:rgba(3,5,9,.55);backdrop-filter:blur(14px)}

  .modal{position:relative;width:min(370px,calc(100vw - 36px));background:var(--glass);
    border:1px solid var(--line);border-radius:18px;padding:24px 22px 20px;
    box-shadow:0 0 60px rgba(37,226,255,.10);
    overflow-y:auto;max-height:90dvh;
    /* le corps de page bloque le geste, il faut le rouvrir ici */
    touch-action:pan-y;-webkit-overflow-scrolling:touch}
  .modal > .brand{position:sticky;top:-24px;z-index:3;
    /* fond opaque : le fond du modal est translucide et laisserait passer le texte défilant */
    background:#0b1017;margin:-24px -22px 0;padding:24px 22px 10px}

  .brand{font-size:29px;font-weight:200;letter-spacing:.14em;line-height:1;
    text-shadow:0 0 26px rgba(37,226,255,.4)}
  .brand b{font-weight:600;color:var(--neon)}
  .tag{margin:9px 0 20px;font-size:12px;line-height:1.5;color:var(--dim)}

  .btn{display:block;width:100%;padding:13px;border-radius:11px;border:1px solid var(--neon);
    background:rgba(37,226,255,.14);color:var(--text);font-size:14px;font-weight:600}
  .btn:active{background:rgba(37,226,255,.3)}
  .btn.ghost{border-color:var(--line);background:transparent;color:var(--dim);font-weight:500}
  .btn.ghost:active{color:var(--text);background:rgba(37,226,255,.1)}
  .btn.danger{border-color:rgba(255,47,154,.4);color:var(--hot);background:transparent}
  .btn + .btn{margin-top:9px}

  .diffrow{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:8px}
  .diffrow span{font-size:10px;letter-spacing:.14em;color:var(--dim2)}
  .diffrow .seg button{padding:7px 9px;font-size:10px}
  .diffnote{margin:0 0 14px;font-size:11px;line-height:1.45;color:var(--dim2);min-height:30px}
  .diffnote b{color:var(--amber);font-weight:600}

  .board{margin-top:22px;border-top:1px solid rgba(37,226,255,.14);padding-top:14px}
  .board h3{margin:0 0 9px;font-size:11px;font-weight:600;color:var(--dim);letter-spacing:.06em}
  .board ol{list-style:none;margin:0;padding:0}
  .board li{display:flex;align-items:baseline;gap:10px;padding:5px 0;font-size:13px;
    border-bottom:1px solid rgba(223,242,248,.06)}
  .board li:last-child{border-bottom:0}
  .board .rk{width:16px;color:var(--dim2);font-size:11px;font-variant-numeric:tabular-nums}
  .board .dv{flex:1;font-variant-numeric:tabular-nums;font-weight:600}
  .board li:first-child .dv{color:var(--neon)}
  .board .dt{font-size:11px;color:var(--dim2);font-variant-numeric:tabular-nums}
  .board .empty{font-size:12px;line-height:1.5;color:var(--dim2);margin:0}

  #settings{align-items:stretch;justify-content:stretch}
  .sheet{position:relative;width:100%;height:100%;background:rgba(5,7,12,.94);
    backdrop-filter:blur(18px);display:flex;flex-direction:column}
  .sheet header{display:flex;align-items:center;gap:12px;flex-wrap:wrap;
    padding:calc(env(safe-area-inset-top) + 14px) 18px 14px;border-bottom:1px solid rgba(37,226,255,.14)}
  .sheet header h2{margin:0;font-size:16px;font-weight:600}
  .tabs{display:flex;gap:8px;flex:1;justify-content:center}
  .tab{padding:7px 16px;border-radius:8px;border:1px solid var(--line);background:transparent;
    color:var(--dim);font-size:11px;font-weight:700;letter-spacing:.1em}
  .tab.on{background:rgba(37,226,255,.16);color:var(--text);border-color:var(--neon)}
  .page{display:none}
  .page.on{display:block}
  @media (min-width:820px){
    .page.on{column-count:2;column-gap:38px}
    .grp,.t-row{break-inside:avoid}
  }
  @media (min-width:1300px){ .page.on{column-count:3} }
  .rst{margin-left:8px;padding:0 6px;border-radius:5px;border:1px solid var(--line);
    background:transparent;color:var(--dim2);font-size:11px;line-height:16px}
  .rst:active{color:var(--neon);border-color:var(--neon)}
  .t-row label span{display:inline-flex;align-items:center}
  .close{width:34px;height:34px;border-radius:9px;border:1px solid var(--line);background:transparent;
    color:var(--text);font-size:17px;line-height:1}
  .sheet .body{flex:1;overflow-y:auto;touch-action:pan-y;-webkit-overflow-scrolling:touch;
    padding:18px 18px calc(env(safe-area-inset-bottom) + 28px)}
  .grp{margin-bottom:26px;max-width:640px}
  .grp p b{color:var(--text);font-weight:600}
  .grp h3{margin:0 0 4px;font-size:13px;font-weight:600}
  .grp p{margin:0 0 14px;font-size:11.5px;line-height:1.5;color:var(--dim)}
  .t-row{margin-bottom:15px;max-width:520px}
  .t-row label{display:flex;justify-content:space-between;font-size:12px;margin-bottom:5px}
  .t-row label b{color:var(--neon);font-weight:600;font-variant-numeric:tabular-nums}
  .t-row input{width:100%;margin:0;accent-color:var(--neon)}
  .t-row .hint{font-size:11px;color:var(--dim2);margin-top:3px;line-height:1.4}
  .switch{display:flex;align-items:center;justify-content:space-between;gap:14px;
    padding:12px 0;border-top:1px solid rgba(223,242,248,.07);max-width:520px}
  .switch span{font-size:13px}
  .switch small{display:block;font-size:11px;color:var(--dim2);margin-top:2px}
  .lnkrow{max-width:520px;text-align:right;margin:-6px 0 4px}
  .lnk{background:none;border:0;padding:0;color:var(--neon);font-size:11px;
    text-decoration:underline;letter-spacing:.03em}

  .infomodal h3{margin:18px 0 5px;font-size:12px;letter-spacing:.1em;color:var(--neon)}
  .infomodal p{margin:0 0 8px;font-size:12px;line-height:1.5;color:var(--dim)}
  .infomodal code{background:rgba(37,226,255,.10);border-radius:4px;padding:1px 5px;
    font-size:11px;color:var(--text);word-break:break-all}
  a.btn{text-decoration:none;text-align:center;font-size:11px;padding:9px}

  .seg{display:flex;gap:6px;flex:none}
  .seg button{padding:7px 11px;border-radius:8px;border:1px solid var(--line);background:transparent;
    color:var(--dim);font-size:11px;font-weight:700;font-variant-numeric:tabular-nums}
  .seg button.on{background:rgba(37,226,255,.16);color:var(--text);border-color:var(--neon)}
  .seg button.off{opacity:.35}
  .seg{border-radius:10px}
  .navgroup{border-radius:10px}
  .navgroup:focus{outline:none}

  .toggle{width:50px;height:29px;border-radius:15px;border:1px solid var(--line);
    background:transparent;position:relative;flex:none}
  .toggle::after{content:'';position:absolute;top:3px;left:3px;width:21px;height:21px;border-radius:50%;
    background:var(--dim);transition:transform .18s,background .18s}
  .toggle.on{background:rgba(37,226,255,.2)}
  .toggle.on::after{transform:translateX(21px);background:var(--neon)}
  .sheet .body .btn{max-width:520px;margin-top:10px}

  .hud{position:fixed;inset:0;pointer-events:none;z-index:10;opacity:0;transition:opacity .2s}
  .hud.on{opacity:1}
  .dist{position:absolute;top:calc(env(safe-area-inset-top) + 14px);left:0;right:0;text-align:center}
  .dist .n{font-size:42px;font-weight:200;letter-spacing:-.02em;line-height:1;
    font-variant-numeric:tabular-nums;text-shadow:0 0 24px rgba(37,226,255,.45)}
  .dist .n i{font-style:normal;font-size:16px;font-weight:400;color:var(--dim);margin-left:3px}
  .dist .r{margin-top:5px;font-size:11px;color:var(--dim2);font-variant-numeric:tabular-nums}
  .dist .coins{margin-top:3px;font-size:10px;letter-spacing:.1em;color:var(--dim2)}
  .dist .coins b{color:#ffc24a;font-weight:700;font-variant-numeric:tabular-nums}
  .pop{position:absolute;left:0;right:0;top:38%;text-align:center;font-size:17px;font-weight:800;
    letter-spacing:.05em;opacity:0;transform:translateY(6px);pointer-events:none}
  .pop.on{opacity:1;transform:translateY(0);transition:opacity .1s,transform .1s}
  .spd{position:absolute;right:16px;top:calc(env(safe-area-inset-top) + 18px);text-align:right}
  .spd .n{font-size:25px;font-weight:600;font-variant-numeric:tabular-nums;color:var(--neon);
    text-shadow:0 0 18px rgba(37,226,255,.5)}
  .spd .u{font-size:10px;color:var(--dim2);letter-spacing:.1em;margin-top:-2px}
  .dist .live{margin-top:2px;font-size:22px;font-weight:800;letter-spacing:.01em;color:#e0913f;
    font-variant-numeric:tabular-nums;text-shadow:0 0 18px currentColor;
    transition:transform .12s;transform-origin:50% 50%}
  .dist .live.up{transform:scale(1.28)}
  .dist .live.cut{transform:scale(0.78)}
  .warn{position:absolute;left:0;right:0;top:27%;text-align:center;font-size:12px;font-weight:600;
    letter-spacing:.18em;color:var(--hot);opacity:0;transition:opacity .1s;
    text-shadow:0 0 20px rgba(255,47,154,.6)}
  .warn.on{opacity:1}
  .warn.drift{color:var(--neon);text-shadow:0 0 20px rgba(37,226,255,.6)}
  .mutebtn{position:fixed;left:16px;top:calc(env(safe-area-inset-top) + 16px);z-index:30;
    width:38px;height:38px;border-radius:11px;border:1px solid var(--line);
    background:rgba(8,20,28,.55);backdrop-filter:blur(8px);color:var(--neon);
    display:flex;align-items:center;justify-content:center;padding:0}
  .mutebtn svg{width:19px;height:19px;fill:currentColor}
  .mutebtn .ico-off{display:none}
  .mutebtn.off{color:var(--dim2);border-color:rgba(223,242,248,.16)}
  .mutebtn.off .ico-on{display:none}
  .mutebtn.off .ico-off{display:block}
  .mutebtn.hide{display:none}
  .fps{position:fixed;left:108px;top:calc(env(safe-area-inset-top) + 16px);z-index:30;
    height:38px;display:none;align-items:center;padding:0 10px;border-radius:11px;
    border:1px solid var(--line);background:rgba(8,20,28,.55);backdrop-filter:blur(8px);
    font-size:11px;font-weight:700;letter-spacing:.06em;color:var(--dim);
    font-variant-numeric:tabular-nums}
  .fps.on{display:flex}
  .fps b{color:var(--neon);font-weight:700;margin-right:4px}

  .pausebtn{position:absolute;left:62px;top:calc(env(safe-area-inset-top) + 16px);
    width:38px;height:38px;border-radius:11px;border:1px solid var(--line);background:rgba(8,20,28,.5);
    backdrop-filter:blur(8px);color:var(--neon);pointer-events:auto;
    display:flex;align-items:center;justify-content:center}
  .pausebtn svg{width:15px;height:15px;fill:currentColor}

  .pads{position:absolute;inset:auto 0 0 0;
    padding:0 16px calc(env(safe-area-inset-bottom) + 16px);
    display:flex;justify-content:flex-end;align-items:flex-end;gap:12px}
  .cluster{display:flex;flex-direction:column;align-items:center;gap:12px;pointer-events:auto}
  body.lefty .pads{justify-content:flex-start}
  body.lefty .stickzone{left:auto;right:0}
  body.lefty .bst{right:auto;left:10px}
  body.lefty .bstlbl{right:auto;left:4px;margin-right:0;margin-left:22px}
  .pad{position:relative;overflow:hidden;width:72px;height:72px;border-radius:50%;
    border:1px solid var(--line);background:rgba(8,20,28,.5);backdrop-filter:blur(8px);
    display:flex;align-items:center;justify-content:center;color:var(--neon);
    transition:transform .06s,background .06s,box-shadow .06s}
  .pad svg{width:28px;height:28px;fill:currentColor;position:relative;z-index:1}
  .pad span{position:relative;z-index:1}
  .pad.brake{width:62px;height:62px;color:var(--hot);border-color:rgba(255,47,154,.35);
    font-size:10px;font-weight:700}
  .pad.boost{width:88px;height:88px;font-size:12px;font-weight:800;letter-spacing:.06em;
    border-color:rgba(37,226,255,.5)}
  .pad.boost .fill{position:absolute;left:0;right:0;bottom:0;height:100%;
    background:linear-gradient(rgba(37,226,255,.32),rgba(37,226,255,.16));z-index:0}
  .pad.boost.low{color:var(--dim2);border-color:rgba(223,242,248,.14)}
  .pad.boost.low .fill{background:rgba(223,242,248,.10)}
  .pad.act{transform:scale(.93);background:rgba(37,226,255,.26);box-shadow:0 0 26px rgba(37,226,255,.35)}
  .pad.brake.act{background:rgba(255,47,154,.26);box-shadow:0 0 26px rgba(255,47,154,.35)}
  .pad.boost.act{box-shadow:0 0 34px rgba(37,226,255,.55)}
  .pad.boost.charge{border-color:rgba(37,226,255,.95);animation:chargepulse .5s ease-in-out infinite}
  @keyframes chargepulse{0%,100%{box-shadow:0 0 12px rgba(37,226,255,.35)}
                         50%{box-shadow:0 0 38px rgba(37,226,255,.85)}}
  .pad.boost.full{border-color:#fff;box-shadow:0 0 26px rgba(255,255,255,.5)}
  .pad .key{position:absolute;bottom:7px;left:0;right:0;text-align:center;font-style:normal;
    font-size:8px;letter-spacing:.12em;color:rgba(223,242,248,.45);z-index:1}
  @media (pointer:coarse){ .pad .key{display:none} }
  .pad.boost .hint{position:absolute;top:-16px;left:50%;transform:translateX(-50%);
    font-size:9px;font-weight:800;letter-spacing:.12em;color:var(--neon);opacity:0;
    transition:opacity .15s;white-space:nowrap}
  .pad.boost.charge .hint{opacity:1}

  .spd .n{transition:font-size .18s ease,color .18s ease}
  .spd.hot .n{font-size:40px;color:#fff;text-shadow:0 0 26px rgba(37,226,255,.85)}
  .spd.sup .n{color:#ffd9f4;text-shadow:0 0 30px rgba(255,47,154,.9)}

  .toast{position:absolute;left:50%;transform:translateX(-50%);
    bottom:calc(env(safe-area-inset-bottom) + 92px);
    width:min(330px,62vw);text-align:center;
    padding:0 10px;font-size:14px;line-height:1.45;letter-spacing:.04em;
    color:rgba(223,242,248,.72);text-shadow:0 1px 10px rgba(3,5,9,.95),0 0 22px rgba(3,5,9,.8);
    opacity:0;transition:opacity .35s,transform .35s;pointer-events:none}
  .toast.on{opacity:1;transform:translateX(-50%) translateY(-6px)}
  @media (min-width:900px){
    .toast{font-size:18px;width:min(460px,44vw);bottom:calc(env(safe-area-inset-bottom) + 110px)}
    .pop{font-size:24px}
    .warn{font-size:15px}
    .sheet .body{padding-left:32px;padding-right:32px}
  }
  @media (min-width:1400px){ .toast{font-size:21px} .pop{font-size:28px} }
  .toast b{color:var(--neon);font-weight:700;text-shadow:0 0 14px rgba(37,226,255,.55)}

  .stickzone{position:absolute;left:0;bottom:0;width:54%;height:60%;pointer-events:auto}
  .hud:not(.on) .stickzone{pointer-events:none}
  .stick{position:absolute;width:106px;height:106px;margin:-53px 0 0 -53px;border-radius:50%;
    border:1px solid var(--line);background:rgba(8,20,28,.34);backdrop-filter:blur(6px);
    opacity:0;transition:opacity .12s;pointer-events:none}
  .stick.on{opacity:1}
  .stick::before{content:'';position:absolute;left:50%;top:50%;width:2px;height:22px;
    margin:-11px 0 0 -1px;background:rgba(37,226,255,.18)}
  .knob{position:absolute;left:50%;top:50%;width:48px;height:48px;margin:-24px 0 0 -24px;
    border-radius:50%;background:rgba(37,226,255,.30);border:1px solid rgba(37,226,255,.65);
    box-shadow:0 0 22px rgba(37,226,255,.4)}

  .hull{position:absolute;top:0;left:0;right:0;height:5px;
    background:rgba(223,242,248,.10);overflow:hidden}
  .hull i{display:block;height:100%;width:100%;background:hsl(120,88%,50%)}
  .hull.crit{animation:critpulse .55s ease-in-out infinite}
  @keyframes critpulse{0%,100%{opacity:1}50%{opacity:.35}}

  /* réserve de boost sur le côté : le doigt masque le bouton, pas cette barre */
  .bst{position:absolute;right:10px;top:50%;transform:translateY(-50%);
    width:7px;height:32vh;max-height:210px;border-radius:4px;
    background:rgba(223,242,248,.12);overflow:hidden;display:flex;align-items:flex-end}
  .bst i{display:block;width:100%;background:var(--neon);border-radius:4px;
    box-shadow:0 0 12px rgba(37,226,255,.6)}
  .bst.full i{background:#fff;box-shadow:0 0 16px rgba(255,255,255,.8)}
  .bst.charge i{animation:bstpulse .5s ease-in-out infinite}
  @keyframes bstpulse{0%,100%{opacity:1}50%{opacity:.45}}
  .bstlbl{position:absolute;right:4px;top:50%;font-size:8px;letter-spacing:.22em;
    color:var(--dim2);transform:translateY(-50%) rotate(180deg);writing-mode:vertical-rl;
    margin-right:22px}


  .nav-sel{outline:2px solid var(--neon);outline-offset:3px;
    box-shadow:0 0 20px rgba(37,226,255,.45)}
  input[type=range].nav-sel{outline-offset:6px}
  .keyhint{margin-top:12px;font-size:10px;letter-spacing:.14em;color:var(--dim2);text-align:center}
  @media (pointer:coarse){.keyhint{display:none}}

  .kb{position:absolute;right:16px;bottom:calc(env(safe-area-inset-bottom) + 18px);
    font-size:10px;line-height:1.5;color:var(--dim2);text-align:right}
  @media (pointer:coarse){.kb{display:none}}

  .pausehead{font-size:20px;font-weight:300;letter-spacing:.1em}
  .pausedist{margin:6px 0 20px;font-size:13px;color:var(--dim);font-variant-numeric:tabular-nums}
  .pausedist b{color:var(--text);font-weight:600;font-size:15px}
  .overtag{margin:2px 0 16px;font-size:12px;color:var(--hot);font-weight:600;letter-spacing:.04em;
    min-height:15px}
  .score{margin:16px 0 4px}
  .srow{display:flex;justify-content:space-between;align-items:baseline;gap:14px;padding:7px 0;
    border-bottom:1px solid rgba(223,242,248,.07);font-size:12px;letter-spacing:.05em;color:var(--dim)}
  .srow b{font-size:15px;font-weight:600;color:var(--text);font-variant-numeric:tabular-nums}
  .srow i{font-style:normal;font-size:10px;color:var(--dim2);letter-spacing:0}
  .srow.total{border-bottom:0;border-top:1px solid var(--line);margin-top:5px;padding-top:11px;
    color:var(--text);font-weight:600}
  .srow.total b{font-size:23px;color:var(--neon);text-shadow:0 0 20px rgba(37,226,255,.4)}
  .srow.pending b{opacity:.25}

  .boot{position:fixed;inset:0;z-index:60;overflow:hidden;background:#05060a;
    display:flex;flex-direction:column;align-items:center;justify-content:center;
    transition:opacity .55s ease, transform .55s ease}
  .boot.gone{opacity:0;transform:scale(1.06);pointer-events:none}

  .boot .glow{position:absolute;left:50%;top:42%;width:150vmin;height:150vmin;
    transform:translate(-50%,-50%);pointer-events:none;
    background:radial-gradient(circle,rgba(37,226,255,.16) 0%,rgba(255,47,154,.07) 35%,transparent 68%)}
  /* La chaussée est un élément à part, les chevrons sont donc bornés par elle.
     Pas de filter sur ce plan : sous transformation 3D le navigateur rasterise
     à basse résolution et le flou devient de la pixellisation. Le fondu vient
     d'une part des dégradés eux mêmes, d'autre part d'un voile en espace écran. */
  .boot .roadwrap{position:absolute;left:0;right:0;bottom:0;height:74vh;pointer-events:none;
    opacity:.3;filter:blur(2px);
    perspective:300px;perspective-origin:50% 0%;
    -webkit-mask-image:linear-gradient(transparent 1%,#000 38%);
    mask-image:linear-gradient(transparent 1%,#000 38%)}
  .boot .road{position:absolute;left:50%;bottom:0;width:88vw;height:170vh;
    transform:translateX(-50%) rotateX(74deg);transform-origin:50% 100%;
    will-change:background-position;
    background-image:
      repeating-linear-gradient(45deg,
        transparent 0 8px, rgba(255,255,255,.10) 16px,
        rgba(255,255,255,.95) 34px, rgba(255,255,255,.95) 53px,
        rgba(255,255,255,.10) 70px, transparent 78px 96px),
      repeating-linear-gradient(-45deg,
        transparent 0 8px, rgba(255,255,255,.10) 16px,
        rgba(255,255,255,.95) 34px, rgba(255,255,255,.95) 53px,
        rgba(255,255,255,.10) 70px, transparent 78px 96px),
      linear-gradient(90deg,rgba(37,226,255,.95) 0 1.4%,transparent 1.4% 98.6%,rgba(37,226,255,.95) 98.6%),
      linear-gradient(#0f141e,#0f141e);
    background-size:50% 100%, 50% 100%, 100% 100%, 100% 100%;
    background-position:left 0, right 0, 0 0, 0 0;
    background-repeat:no-repeat;
    animation:roadrun .192s linear infinite}
  @keyframes roadrun{
    from{background-position:left 0,       right 0,       0 0, 0 0}
    to  {background-position:left 271.53px, right 271.53px, 0 0, 0 0}
  }
  /* voile de flou calculé en espace écran, donc à la résolution réelle */
  .boot .veil{position:absolute;left:0;right:0;bottom:0;height:74vh;pointer-events:none;
    -webkit-backdrop-filter:blur(9px);backdrop-filter:blur(9px);
    -webkit-mask-image:linear-gradient(#000 0 30%,rgba(0,0,0,.75) 68%,rgba(0,0,0,.45) 100%);
    mask-image:linear-gradient(#000 0 30%,rgba(0,0,0,.75) 68%,rgba(0,0,0,.45) 100%)}
  .boot .horizon{position:absolute;left:0;right:0;top:44%;height:1px;pointer-events:none;
    background:linear-gradient(90deg,transparent,rgba(37,226,255,.8) 38%,rgba(255,47,154,.6) 68%,transparent);
    box-shadow:0 0 30px 8px rgba(37,226,255,.20)}

  .boot .mark{position:relative;text-align:center;padding:0 20px}
  .boot .mark h1{margin:0;font-size:clamp(34px,13vw,62px);font-weight:200;letter-spacing:.16em;
    line-height:1;background:linear-gradient(100deg,#9bf0ff,#ffffff 35%,#ff6fc0 70%,#25e2ff);
    background-size:220% 100%;-webkit-background-clip:text;background-clip:text;color:transparent;
    animation:sheen 3.4s ease-in-out infinite}
  @keyframes sheen{0%,100%{background-position:0% 50%}50%{background-position:100% 50%}}
  .boot .mark h1 b{font-weight:700}
  .boot .mark p{margin:14px 0 0;font-size:11px;letter-spacing:.28em;color:rgba(223,242,248,.42)}

  .boot .bar{position:relative;margin-top:34px;width:min(240px,60vw);height:2px;
    background:rgba(223,242,248,.13);border-radius:2px;overflow:hidden}
  .boot .bar i{display:block;height:100%;width:8%;border-radius:2px;
    background:linear-gradient(90deg,#25e2ff,#ff2f9a);
    box-shadow:0 0 12px rgba(37,226,255,.7);transition:width .45s ease}
  .boot .lbl{position:relative;margin-top:12px;font-size:10px;letter-spacing:.22em;
    color:rgba(223,242,248,.35)}