*{box-sizing:border-box}html,body{height:100%;margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:#0a0a0a;color:#f5f5f5}
header{padding:16px 20px;text-align:center}
.subtitle{opacity:.8;margin-top:-6px}
main{max-width:820px;margin:0 auto;padding:12px}
.display{display:flex;flex-direction:column;align-items:center;gap:8px;padding:24px 16px;margin:12px 0;border:1px solid #222;border-radius:16px;background:linear-gradient(180deg,#101010,#0a0a0a);transition:box-shadow .2s ease, border-color .2s ease}
.pace{font-size:15vw;line-height:1;font-weight:700;letter-spacing:2px;text-shadow:0 0 10px rgba(255,255,255,.05)}
.unit{opacity:.9;margin-top:-10px}
.status{margin-top:4px;font-size:14px;opacity:.9}
.details{display:grid;grid-template-columns:1fr 1fr;gap:6px 14px;margin-top:8px;font-size:13px;opacity:.85}
.controls{display:flex;justify-content:center;gap:10px;margin:16px 0}
button{padding:12px 16px;border-radius:10px;background:#1c1c1c;border:1px solid #333;color:#f5f5f5;font-weight:600}
button:disabled{opacity:.5}
.toggles{display:flex;flex-direction:column;gap:8px;margin:8px 0 16px}
.settings,.education{border:1px solid #222;border-radius:16px;padding:16px;background:#0e0e0e;margin:12px 0}
.settings h2,.education h2{margin:0 0 8px 0}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:8px 0}
.grid3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px;margin:8px 0}
label{display:flex;flex-direction:column;gap:6px;font-size:14px}
input,select{padding:10px 12px;border-radius:10px;border:1px solid #333;background:#111;color:#f5f5f5}
.helper{font-size:12px;opacity:.7;align-self:end;padding-top:10px}
.edu-stats{display:flex;flex-wrap:wrap;gap:14px;margin-top:8px;font-size:14px;opacity:.9}
.edu-note{opacity:.8;font-size:13px;margin-top:6px}
.highlight-green{box-shadow:0 0 0 2px rgba(0,255,0,.35), 0 0 24px rgba(0,255,0,.25);border-color:#1f3}
.highlight-yellow{box-shadow:0 0 0 2px rgba(255,255,0,.25), 0 0 24px rgba(255,255,0,.2);border-color:#aa3}
.highlight-red{box-shadow:0 0 0 2px rgba(255,0,0,.25), 0 0 24px rgba(255,0,0,.2);border-color:#a33}
@media (min-width:640px){.pace{font-size:96px}}