:root{
  --bg:#0b0c10;--bg2:#12141a;--card:#161921;--card2:#1c2029;--ink:#f2f3f6;--mute:#9aa1ae;--line:#262b36;
  --red:#e11d2e;--red2:#ff3b4b;--white:#ffffff;--ok:#38d47a;--warn:#ffb020;--tap:50px;
  font-size:17px
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);font-family:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;line-height:1.45;-webkit-font-smoothing:antialiased}

/* hero */
.hero{position:relative;height:220px;background:#000 url(car.jpg) 60% 62%/cover no-repeat;overflow:hidden}
.hero:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(11,12,16,.15) 0%,rgba(11,12,16,.35) 55%,rgba(11,12,16,.97) 100%)}
.hero .title{position:absolute;left:1rem;right:1rem;bottom:.9rem;z-index:1;display:flex;align-items:flex-end;gap:.8rem}
.hero .num{font-family:"Arial Black",Impact,system-ui,sans-serif;font-size:3rem;line-height:1;font-weight:900;font-style:italic;color:var(--white);text-shadow:0 2px 0 var(--red),0 6px 18px rgba(0,0,0,.7);letter-spacing:-.04em}
.hero h1{margin:0 0 .25rem;font-size:1.05rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--white);text-shadow:0 2px 10px rgba(0,0,0,.8)}
.hero .tag{color:#d8dbe2;font-size:.8rem;letter-spacing:.04em;text-shadow:0 1px 6px rgba(0,0,0,.8)}
.checker{height:10px;background:
  linear-gradient(45deg,#fff 25%,transparent 25%,transparent 75%,#fff 75%),
  linear-gradient(45deg,#fff 25%,transparent 25%,transparent 75%,#fff 75%);
  background-color:#111;background-size:10px 10px;background-position:0 0,5px 5px}
.stripe{height:4px;background:var(--red)}

/* nav */
nav{position:sticky;top:0;z-index:5;display:flex;gap:.35rem;padding:.6rem .8rem;background:rgba(11,12,16,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);overflow-x:auto;scrollbar-width:none}
nav::-webkit-scrollbar{display:none}
nav button{flex:1 1 0;min-height:40px;background:var(--bg2);border:1px solid var(--line);color:var(--mute);font-size:.82rem;font-weight:600;padding:.45rem .35rem;border-radius:999px;white-space:nowrap;transition:all .15s}
nav button.on{color:#fff;background:var(--red);border-color:var(--red);box-shadow:0 4px 14px rgba(225,29,46,.35)}

main{padding:1rem;max-width:720px;margin:0 auto}
section.tab{display:none;animation:fade .2s ease}section.tab.on{display:block}
@keyframes fade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}

.card{background:linear-gradient(180deg,var(--card2),var(--card));border:1px solid var(--line);border-radius:16px;padding:1.1rem;margin-bottom:1rem;box-shadow:0 10px 30px rgba(0,0,0,.35)}
.card h2{margin:0 0 .6rem;font-size:.8rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--red2)}
.card h2:before{content:"";display:inline-block;width:10px;height:10px;background:var(--red);transform:skewX(-20deg);margin-right:.55rem;vertical-align:-1px}
label{display:block;color:var(--mute);font-size:.82rem;font-weight:600;letter-spacing:.02em;margin:.75rem 0 .3rem}
select,input,textarea,button.primary,button.ghost{width:100%;min-height:var(--tap);font-size:1rem;border-radius:12px;border:1px solid var(--line);background:#0c0e13;color:var(--ink);padding:.55rem .8rem;font-family:inherit}
select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--mute) 50%),linear-gradient(135deg,var(--mute) 50%,transparent 50%);background-position:calc(100% - 20px) 50%,calc(100% - 14px) 50%;background-size:6px 6px;background-repeat:no-repeat;padding-right:2.4rem}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--red);box-shadow:0 0 0 3px rgba(225,29,46,.2)}
textarea{min-height:84px}
button.primary{background:linear-gradient(180deg,var(--red2),var(--red));border-color:var(--red);color:#fff;font-weight:800;letter-spacing:.03em;margin-top:.9rem;box-shadow:0 6px 18px rgba(225,29,46,.3);cursor:pointer}
button.primary:active{transform:translateY(1px)}
button.ghost{background:transparent;margin-top:.5rem;color:var(--mute);cursor:pointer}

.row{display:grid;grid-template-columns:1fr 1fr;gap:.7rem}
.row3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:.45rem}
.wheel{position:relative;border:1px solid var(--line);border-radius:14px;padding:.8rem .6rem .6rem;background:#0f1117;text-align:center;overflow:hidden}
.wheel .tag{font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:var(--mute);font-weight:700}
.wheel svg{width:74px;height:74px;margin:.35rem auto .1rem;display:block}
.wheel .tire{transition:transform .35s ease;transform-origin:50% 88%}
.wheel .big{font-size:2.1rem;font-weight:900;letter-spacing:-.03em;line-height:1.1;margin:.1rem 0;font-variant-numeric:tabular-nums}
.wheel .big.neg{color:#fff}.wheel .big.pos{color:#fff}
.wheel .sub{color:var(--mute);font-size:.78rem}
.sub{color:var(--mute);font-size:.85rem;text-align:center}
.stat{display:flex;justify-content:space-around;margin:.7rem 0 .2rem;padding:.6rem 0;border-top:1px dashed var(--line);border-bottom:1px dashed var(--line)}
.stat div{text-align:center}.stat b{display:block;font-size:1.05rem}.stat span{font-size:.72rem;color:var(--mute);letter-spacing:.08em;text-transform:uppercase}
.why{color:#c6cad3;font-size:.92rem;margin-top:.7rem}
.why p{margin:.35rem 0;padding-left:1rem;position:relative}
.why p:before{content:"";position:absolute;left:0;top:.55em;width:6px;height:6px;background:var(--red);transform:rotate(45deg)}
.trackinfo{display:flex;gap:.6rem;align-items:center;margin-top:.6rem;color:#c6cad3;font-size:.9rem}
.trackinfo .chip{flex:0 0 auto;background:#0c0e13;border:1px solid var(--line);border-radius:10px;padding:.35rem .6rem;text-align:center;min-width:64px}
.trackinfo .chip b{display:block;font-size:1rem}.trackinfo .chip span{font-size:.65rem;color:var(--mute);text-transform:uppercase;letter-spacing:.08em}

.seg{display:flex;gap:.4rem;flex-wrap:wrap}
.seg button{flex:1;min-height:var(--tap);border:1px solid var(--line);background:#0c0e13;color:var(--ink);border-radius:12px;font-size:.92rem;font-weight:600;font-family:inherit;cursor:pointer;transition:all .12s}
.seg button.on{background:#fff;color:#0b0c10;border-color:#fff}
.rec{border-left:4px solid var(--red);padding:.7rem .9rem;margin:.6rem 0;background:#11141b;border-radius:0 12px 12px 0}
.rec.ok{border-left-color:var(--ok)}.rec.warn{border-left-color:var(--warn)}
.rec b{display:block;margin-bottom:.25rem}
table{width:100%;border-collapse:collapse;font-size:.9rem}
td,th{border-bottom:1px solid var(--line);padding:.55rem .35rem;text-align:left;vertical-align:top}
th{color:var(--mute);font-weight:700;font-size:.72rem;letter-spacing:.1em;text-transform:uppercase}
.pill{display:inline-block;border:1px solid var(--red);color:var(--red2);border-radius:999px;padding:.05rem .55rem;font-size:.7rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;margin-top:.25rem}
.pill.later{border-color:var(--line);color:var(--mute)}
.log-item{border-bottom:1px solid var(--line);padding:.7rem 0}
.log-item .t{color:var(--mute);font-size:.78rem;letter-spacing:.03em}
.log-item .t b{color:var(--red2);text-transform:uppercase;font-size:.7rem;letter-spacing:.1em;margin-right:.4rem}
.muted{color:var(--mute)}
footer{color:var(--mute);font-size:.75rem;text-align:center;padding:1.6rem 1rem 2.4rem}
footer .checker{margin:0 auto .9rem;width:120px;height:8px;background-size:8px 8px;background-position:0 0,4px 4px;border-radius:2px}
@media (min-width:600px){.hero{height:260px}}

/* v2 additions */
.small{font-size:.8rem}
.grid4{display:grid;grid-template-columns:1.25fr 1fr 1fr 1fr 1fr;gap:.35rem;align-items:center;margin:.3rem 0}
.grid4.head{color:var(--mute);font-size:.7rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;text-align:center;margin-top:.5rem}
.grid4 .k{color:var(--mute);font-size:.8rem;font-weight:600}
.grid4 input{min-height:44px;padding:.3rem .15rem;text-align:center;font-size:.95rem;font-variant-numeric:tabular-nums}
.grid4 .calc{text-align:center;font-weight:700;font-variant-numeric:tabular-nums}
.wheel input{min-height:42px;text-align:center;font-weight:800;font-size:1.2rem;font-variant-numeric:tabular-nums}
.wheel label{margin:.4rem 0 .15rem;text-align:center}
.wheel svg{width:60px;height:60px}
.stat{flex-wrap:wrap;gap:.5rem}
button.danger{border-color:#5a2028;color:#ff8a94}
.steps{padding-left:1.2rem;color:#c6cad3}.steps li{margin:.5rem 0}
.track-item{border-bottom:1px solid var(--line);padding:.7rem 0}
.track-item .row3{margin:.3rem 0}
.track-item input{min-height:40px;padding:.3rem .5rem}
.track-item .actions{display:flex;gap:.4rem;margin-top:.4rem}
.track-item .actions button{flex:1;min-height:40px;border-radius:10px;border:1px solid var(--line);background:#0c0e13;color:var(--mute);font-family:inherit;font-size:.85rem}
.log-item .snap{font-size:.82rem;color:#c6cad3;margin-top:.3rem}
.log-item .actions{display:flex;gap:.4rem;margin-top:.5rem}
.log-item .actions button{flex:1;min-height:38px;border-radius:10px;border:1px solid var(--line);background:#0c0e13;color:var(--ink);font-family:inherit;font-size:.82rem}
.rec small{display:block;color:var(--mute);margin-top:.2rem}

/* quick adjust */
.qa{display:flex;flex-direction:column;gap:.35rem}
.qrow{display:grid;grid-template-columns:1fr 52px 56px 52px;gap:.35rem;align-items:center;background:#0f1117;border:1px solid var(--line);border-radius:12px;padding:.45rem .5rem}
.qrow .ql b{display:block;font-size:.92rem}.qrow .ql span{display:block;color:var(--mute);font-size:.72rem;line-height:1.25}.qrow .ql em{font-style:normal;color:#c6cad3}
.qrow button{min-height:44px;border-radius:10px;border:1px solid var(--line);background:#161921;color:#fff;font-weight:800;font-size:1rem;font-family:inherit;cursor:pointer}
.qrow button:active{background:var(--red);border-color:var(--red)}
.qrow .qv{text-align:center;font-weight:900;font-size:1.1rem;font-variant-numeric:tabular-nums}
.row3 label{margin-top:.4rem}

/* page switch: front / rear */
.pageswitch{display:flex;gap:.4rem;padding:.7rem .8rem 0;max-width:720px;margin:0 auto}
.pageswitch a{flex:1;text-align:center;text-decoration:none;color:var(--mute);font-weight:800;letter-spacing:.12em;text-transform:uppercase;font-size:.8rem;padding:.6rem;border:1px solid var(--line);border-radius:12px;background:var(--bg2)}
.pageswitch a.on{color:#fff;background:#fff0;border-color:#fff;box-shadow:inset 0 -3px 0 var(--red)}
body.rear .card h2:before{background:#fff}
body.rear .stripe{background:#fff}
main a{color:var(--red2)}
.grid3{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:.35rem;align-items:center;margin:.3rem 0}
.grid3.head{color:var(--mute);font-size:.7rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;text-align:center;margin-top:.5rem}
.grid3 .k{color:var(--mute);font-size:.8rem;font-weight:600}
.grid3 input{min-height:44px;padding:.3rem .15rem;text-align:center;font-size:.95rem;font-variant-numeric:tabular-nums}
.note{margin:.1rem 0 .5rem;min-height:1em}
main ul.muted{padding-left:1.2rem}main ul.muted li{margin:.4rem 0}

/* wish list */
.wishbtn{position:fixed;right:.9rem;bottom:calc(.9rem + env(safe-area-inset-bottom));z-index:20;min-height:42px;padding:.45rem .9rem .45rem .7rem;border-radius:999px;border:1px solid rgba(255,255,255,.18);background:rgba(22,25,33,.92);backdrop-filter:blur(8px);color:#e8eaf0;font-family:inherit;font-weight:700;font-size:.82rem;letter-spacing:.02em;box-shadow:0 8px 24px rgba(0,0,0,.45);display:flex;align-items:center;gap:.4rem;cursor:pointer}
.wishbtn span{display:inline-flex;width:20px;height:20px;border-radius:50%;background:var(--red);color:#fff;align-items:center;justify-content:center;font-weight:900;font-size:.95rem;line-height:1}
.wishsheet{position:fixed;inset:0;z-index:30;background:rgba(0,0,0,.55);display:none;align-items:flex-end;justify-content:center}
.wishsheet.on{display:flex}
.wishpanel{width:100%;max-width:720px;background:var(--card2);border:1px solid var(--line);border-radius:18px 18px 0 0;padding:1rem 1rem calc(1rem + env(safe-area-inset-bottom));box-shadow:0 -10px 40px rgba(0,0,0,.5);animation:up .18s ease}
@keyframes up{from{transform:translateY(30px);opacity:0}to{transform:none;opacity:1}}
.wishhead{display:flex;justify-content:space-between;align-items:center;margin-bottom:.3rem}
.wishhead b{font-size:1rem;letter-spacing:.1em;text-transform:uppercase;color:var(--red2)}
.wishclose{background:none;border:0;color:var(--mute);font-size:1.6rem;line-height:1;min-width:44px;min-height:44px;cursor:pointer}
.wishpanel textarea{min-height:110px;margin-top:.4rem}
footer{padding-bottom:4.5rem}

/* race day */
body.raceday .card h2:before{background:var(--warn)}
body.raceday .stripe{background:var(--warn)}
.setitem{display:grid;grid-template-columns:1fr auto;gap:.5rem;align-items:center;border:1px solid var(--line);border-radius:12px;padding:.7rem .8rem;margin:.4rem 0;background:#0f1117}
.setitem.mounted{border-color:var(--warn)}
.setitem .n{font-weight:800}.setitem .m{color:var(--mute);font-size:.8rem}
.setitem .badge{font-size:.7rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;border-radius:999px;padding:.2rem .55rem;border:1px solid var(--line);color:var(--mute)}
.setitem .badge.feature{border-color:var(--ok);color:var(--ok)}.setitem .badge.done{border-color:#5a2028;color:#ff8a94}.setitem .badge.mounted{border-color:var(--warn);color:var(--warn)}
.setitem button{min-height:44px;border-radius:10px;border:1px solid var(--line);background:#161921;color:#fff;font-family:inherit;font-weight:700;padding:0 .9rem}
.steppers{display:flex;flex-direction:column;gap:.4rem;margin:.5rem 0}
.stepper{display:flex;align-items:center;gap:.35rem;background:#0f1117;border:1px solid var(--line);border-radius:12px;padding:.4rem .5rem}
.stepper span{flex:1;color:var(--mute);font-size:.85rem;font-weight:600}
.stepper b{min-width:44px;text-align:center;font-size:1.2rem}
.stepper button{min-width:52px;min-height:44px;border-radius:10px;border:1px solid var(--line);background:#161921;color:#fff;font-weight:800;font-family:inherit}
.timer{text-align:center}
.tbig{font-size:3.2rem;font-weight:900;letter-spacing:-.03em;font-variant-numeric:tabular-nums;line-height:1.1;margin:.3rem 0}
.tsub{color:var(--mute);font-size:.85rem}
.lapbtn{width:100%;min-height:120px;margin:.8rem 0 .4rem;border-radius:20px;border:0;background:linear-gradient(180deg,var(--red2),var(--red));color:#fff;font-size:2rem;font-weight:900;letter-spacing:.1em;font-family:inherit;box-shadow:0 10px 30px rgba(225,29,46,.4)}
.lapbtn.running{background:linear-gradient(180deg,#3ddc84,#1fae62);box-shadow:0 10px 30px rgba(56,212,122,.35)}
.lapbtn:active{transform:scale(.98)}
.big2{font-size:1.6rem;font-weight:900;min-height:50px;display:flex;align-items:center}
.ledger-item{border-bottom:1px solid var(--line);padding:.6rem 0}
.ledger-item .t{color:var(--mute);font-size:.78rem}
.ledger-item .lap{font-size:1.3rem;font-weight:900;font-variant-numeric:tabular-nums}
.ledger-item .gain{font-weight:800}.gain.up{color:var(--ok)}.gain.down{color:#ff8a94}
.ledger-item.best{border-left:4px solid var(--ok);padding-left:.6rem}
.ck{display:flex;align-items:center;gap:.6rem;min-height:52px;border-bottom:1px solid var(--line)}
.ck input{width:28px;height:28px;min-height:0;accent-color:var(--ok);flex:0 0 auto}
.ck label{flex:1;margin:0;color:var(--ink);font-size:1rem;font-weight:500}
.ck.done label{color:var(--mute);text-decoration:line-through}
.ck button{min-width:44px;min-height:44px;background:none;border:0;color:var(--mute);font-size:1.2rem}
.fc{display:grid;grid-template-columns:repeat(6,1fr);gap:.3rem;margin:.5rem 0}
.fc div{background:#0f1117;border:1px solid var(--line);border-radius:10px;padding:.4rem .2rem;text-align:center;font-size:.75rem}
.fc b{display:block;font-size:1rem}
.fc small{display:block;color:var(--mute)}