:root{--ink:#211A4A;--ink-soft:#5B5685;--bg-top:#E9F1FF;--bg-bot:#F3ECFF;--maths:#2563EB;--pink:#EC4899;--gold:#F59E0B;--shadow-sm:0 8px 18px -10px rgba(33,26,74,.3);--page-max:1100px}@media(min-width:1281px){:root{--page-max:1200px}}*{box-sizing:border-box}html,body{margin:0;padding:0}#install-banner-btn[hidden]{display:none}body{font-family:system-ui,sans-serif;color:var(--ink);background:linear-gradient(160deg,var(--bg-top),var(--bg-bot));min-height:100vh;overflow-x:hidden}h1,h2,h3{font-family:ui-rounded,system-ui,sans-serif;font-weight:600}a{color:var(--maths)}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px clamp(16px,4vw,40px);max-width:var(--page-max);margin:0 auto}.brand{font-family:ui-rounded,system-ui,sans-serif;font-weight:700;font-size:1.5rem;color:var(--ink);text-decoration:none;display:inline-flex;flex-direction:column;align-items:flex-start}.brand-row{display:inline-flex;align-items:center;gap:6px}.brand-star{color:var(--gold)}.brand-sub{color:var(--pink)}.brand-tag{font-family:system-ui,sans-serif;font-weight:600;font-size:.62rem;color:var(--ink-soft);opacity:.75;margin-top:-2px}.topnav{display:flex;align-items:center;gap:8px}.wrap{max-width:var(--page-max);margin:0 auto;padding:8px clamp(16px,4vw,40px) 60px}.btn{--c:var(--maths);--c-dark:#1d4ed8;appearance:none;border:0;cursor:pointer;font-family:ui-rounded,system-ui,sans-serif;font-weight:600;font-size:1.15rem;color:#fff;background:var(--c);padding:15px 28px;border-radius:16px;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:44px;box-shadow:0 6px 0 0 var(--c-dark),var(--shadow-sm)}.btn-sm{font-size:.95rem;padding:9px 16px;border-radius:12px;box-shadow:0 4px 0 0 var(--c-dark)}.btn-gold{--c:#047857;--c-dark:#065F46}.btn-ghost{background:#f1f5f9;color:var(--ink);border:1.5px solid #CBD5E1;box-shadow:0 3px #cbd5e1}@media(max-width:480px){.brand{font-size:1.15rem}.hide-xs{display:none}.topnav .btn-sm{font-size:.8rem;padding:7px 11px}}.install-banner{max-width:var(--page-max,1100px);margin:0 auto 8px;padding:10px 16px;background:#fff;border-left:6px solid var(--maths);border-radius:var(--r-sm,12px);box-shadow:var(--shadow-sm);display:flex;align-items:center;gap:12px}.install-banner[hidden]{display:none}.install-banner-icon{font-size:1.4rem;flex:0 0 auto}.install-banner-text{flex:1 1 auto;display:flex;flex-direction:column;gap:1px;font-size:.88rem;min-width:0}.install-banner-text strong{font-size:.95rem}.install-banner .btn-sm{flex:0 0 auto}.install-banner-close{appearance:none;border:0;background:transparent;cursor:pointer;font-size:1.1rem;line-height:1;color:var(--ink-soft);padding:6px;flex:0 0 auto}@media(max-width:480px){.install-banner{flex-wrap:wrap}.install-banner-text{order:1;flex-basis:100%}}.ob-steps{display:flex;align-items:flex-start;justify-content:center;gap:0;margin:0 auto 26px;max-width:420px}.ob-step{text-align:center;flex:0 0 auto;width:96px}.ob-num{font-family:Fredoka,sans-serif;font-size:.66rem;font-weight:700;text-transform:uppercase;letter-spacing:1.2px;color:#94a3b8;margin-bottom:5px}.ob-step.on .ob-num{color:#2563eb}.ob-dot{width:44px;height:44px;margin:0 auto 6px;display:flex;align-items:center;justify-content:center;border-radius:50%;font-size:1.15rem;background:#fff;border:2px solid #d7d7e6;transition:all .2s;animation:ob-bob 2.6s ease-in-out infinite}.ob-step:nth-child(3) .ob-dot{animation-delay:.25s}.ob-step:nth-child(5) .ob-dot{animation-delay:.5s}.ob-step.on .ob-dot{border-color:#2563eb;background:#eff6ff;box-shadow:0 0 0 4px #2563eb26;animation:ob-bob 2.6s ease-in-out infinite}.ob-lbl{font-size:.74rem;font-weight:700;color:var(--ink-soft);line-height:1.25}.ob-step.on .ob-lbl{color:#2563eb}.ob-line{flex:1 1 auto;height:2px;background:#d7d7e6;margin-top:40px;min-width:18px;border-radius:2px;position:relative;overflow:hidden}.ob-line:after{content:"";position:absolute;top:0;left:0;width:45%;height:100%;border-radius:2px;background:linear-gradient(90deg,transparent,rgba(37,99,235,.95),transparent);transform:translate(-120%);animation:ob-line-shine 2.6s ease-in-out infinite}.ob-line:last-of-type:after{animation-delay:.4s}@keyframes ob-line-shine{0%{transform:translate(-120%)}60%,to{transform:translate(280%)}}@keyframes ob-bob{0%,to{transform:translateY(0)}50%{transform:translateY(-5px)}}@media(prefers-reduced-motion:reduce){.ob-dot,.ob-step.on .ob-dot,.ob-line:after{animation:none}}