:root{--bg:#ffffff;--bg-soft:#f8f9fc;--surface:#ffffff;--surface-muted:#f8f9fc;--surface-subtle:#f1f5f9;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#94a3b8;--text-disabled:#cbd5e1;--text-inverse:#ffffff;--accent:#00c9a7;--accent-deep:#00a98d;--accent-soft:#e6fbf6;--energy:#ff6b35;--energy-deep:#e55a24;--energy-soft:#ffede3;--math-deep:#0f172a;--math-glow:#06b6d4;--trivia-deep:#c2410c;--trivia-glow:#facc15;--gold:#f59e0b;--gold-deep:#d97706;--gold-soft:#fef3c7;--danger:#ef4444;--success:#10b981;--border:#e2e8f0;--border-strong:#cbd5e1;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:20px;--radius-full:999px;--shadow-card:0 2px 8px rgba(0,0,0,0.04);--shadow-cta:0 4px 16px rgba(0,0,0,0.08);--shadow-elevated:0 8px 24px rgba(0,0,0,0.06);--shadow-pop:0 10px 20px rgba(0,0,0,0.12);--font-rounded:-apple-system,BlinkMacSystemFont,"SF Pro Rounded","SF Pro Display","Inter","Plus Jakarta Sans",system-ui,sans-serif}*{box-sizing:border-box}body,html{margin:0;padding:0;font-family:var(--font-rounded);color:var(--text-primary);background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}body{line-height:1.5;font-size:16px}a{color:var(--accent-deep);text-decoration:none;font-weight:700}a:hover{text-decoration:underline}img{max-width:100%;display:block}.container{width:100%;max-width:1080px;margin:0 auto;padding:0 24px}.container--narrow{max-width:720px}.site-header{padding:24px 0;background:transparent}.site-header .container{display:flex;align-items:center;justify-content:space-between;gap:24px}.site-header nav{display:flex;gap:24px;font-size:14px}.site-header nav a{color:var(--text-secondary);font-weight:700;letter-spacing:-.2px}.site-header nav a:hover{color:var(--text-primary);text-decoration:none}.wordmark{display:inline-flex;align-items:center;gap:4px;font-weight:900;letter-spacing:-1.2px;color:var(--text-primary);line-height:1}.wordmark .slash{display:inline-block;width:2px;background:var(--accent);transform:rotate(20deg);margin:0 4px}.wordmark--sm{font-size:16px}.wordmark--sm .slash{height:12px}.wordmark--md{font-size:22px}.wordmark--md .slash{height:16px}.wordmark--lg{font-size:32px}.wordmark--lg .slash{height:22px}.hero{position:relative;padding:64px 0 96px;overflow:hidden;background:radial-gradient(1200px 500px at 50% -10%,rgba(0,201,167,.18),transparent 60%),linear-gradient(180deg,var(--accent-soft) 0,var(--bg-soft) 60%,#fff 100%)}.hero .container{position:relative;z-index:1;text-align:center}.hero h1{font-size:clamp(40px,7vw,72px);font-weight:900;letter-spacing:-2.5px;line-height:1.02;margin:24px 0 16px;color:var(--text-primary)}.hero .lede{font-size:clamp(16px,2vw,19px);color:var(--text-secondary);max-width:580px;margin:0 auto 32px;letter-spacing:-.3px;font-weight:600}.hero .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 14px;border-radius:var(--radius-full);background:rgba(255,255,255,.7);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border:1px solid rgba(0,201,167,.25);color:var(--accent-deep);font-size:12px;font-weight:800;letter-spacing:.4px;text-transform:uppercase;box-shadow:var(--shadow-card)}.hero .eyebrow .dot{width:6px;height:6px;border-radius:50%;background:var(--accent);animation:pulse 1.6s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.7)}}.sparkle{position:absolute;font-weight:900;font-size:24px;animation:float 4s ease-in-out infinite;pointer-events:none;-webkit-user-select:none;-moz-user-select:none;user-select:none}.sparkle--1{top:18%;left:12%;color:var(--gold);transform:rotate(-18deg);animation-delay:0s}.sparkle--2{top:28%;right:10%;color:var(--energy);transform:rotate(20deg);font-size:18px;animation-delay:.5s}.sparkle--3{bottom:25%;left:16%;color:var(--danger);transform:rotate(-25deg);font-size:16px;animation-delay:1s}.sparkle--4{bottom:30%;right:14%;color:var(--accent);transform:rotate(40deg);font-size:20px;animation-delay:1.5s}@keyframes float{0%,to{transform:translateY(0) rotate(var(--rot,0deg))}50%{transform:translateY(-8px) rotate(var(--rot,0deg))}}.cta-row{flex-wrap:wrap;gap:12px}.btn,.cta-row{display:inline-flex;justify-content:center;align-items:center}.btn{gap:10px;padding:14px 22px;border-radius:var(--radius-full);font-family:inherit;font-weight:800;font-size:15px;letter-spacing:-.2px;border:none;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease;text-decoration:none}.btn--primary{background:var(--text-primary);color:var(--text-inverse);box-shadow:var(--shadow-cta)}.btn--primary:hover{transform:translateY(-1px);box-shadow:var(--shadow-pop);text-decoration:none}.btn--ghost{background:rgba(255,255,255,.7);color:var(--text-primary);border:1px solid var(--border)}.btn--ghost:hover{background:#fff;border-color:var(--border-strong);text-decoration:none}.btn .arrow{transition:transform .2s ease}.btn:hover .arrow{transform:translateX(2px)}.app-store-badge{display:inline-flex;align-items:center;gap:12px;padding:12px 22px 12px 18px;background:var(--text-primary);color:var(--text-inverse);border-radius:14px;font-weight:700;letter-spacing:-.2px;text-decoration:none;box-shadow:var(--shadow-cta);transition:transform .15s ease,box-shadow .15s ease}.app-store-badge:hover{transform:translateY(-1px);box-shadow:var(--shadow-pop);text-decoration:none}.app-store-badge svg{flex-shrink:0}.app-store-badge .small{font-size:11px;opacity:.85;line-height:1;letter-spacing:0}.app-store-badge .big{font-size:19px;font-weight:700;line-height:1.05;letter-spacing:-.3px}.app-store-badge .stack{display:flex;flex-direction:column;gap:3px}.section{padding:96px 0}.section h2{font-size:clamp(28px,4vw,40px);font-weight:900;letter-spacing:-1.5px;margin:0 0 12px;text-align:center}.section .section-lede{text-align:center;color:var(--text-secondary);font-size:17px;font-weight:600;margin:0 auto 48px;max-width:540px}.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));grid-gap:16px;gap:16px}.feature{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);padding:24px;box-shadow:var(--shadow-card);transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease}.feature:hover{transform:translateY(-2px);box-shadow:var(--shadow-elevated);border-color:var(--border-strong)}.feature .glyph{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:900;margin-bottom:16px;color:#fff}.feature--math .glyph{background:linear-gradient(135deg,var(--math-deep),var(--math-glow))}.feature--trivia .glyph{background:linear-gradient(135deg,var(--trivia-deep),var(--trivia-glow));color:#1f1303}.feature--arena .glyph{background:linear-gradient(135deg,var(--energy),var(--gold))}.feature--streak .glyph{background:linear-gradient(135deg,var(--danger),var(--energy),var(--gold))}.feature h3{margin:0 0 6px;font-size:18px;font-weight:800;letter-spacing:-.4px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}.feature p{margin:0;color:var(--text-secondary);font-size:14.5px;font-weight:500;line-height:1.55}.badge{display:inline-flex;align-items:center;padding:3px 9px;border-radius:var(--radius-full);background:var(--accent-soft);color:var(--accent-deep);font-size:10.5px;font-weight:800;letter-spacing:.4px;text-transform:uppercase;border:1px solid rgba(0,201,167,.3)}.pillars{background:linear-gradient(180deg,#fff 0,var(--accent-soft) 100%)}.pillars-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));grid-gap:32px;gap:32px;text-align:center}.pillar h3{margin:0 0 6px;font-size:22px;font-weight:900;letter-spacing:-.6px}.pillar p{margin:0;color:var(--text-secondary);font-weight:500}.pillar .num{display:inline-block;font-size:11px;font-weight:800;letter-spacing:.5px;color:var(--accent-deep);text-transform:uppercase;margin-bottom:8px}.doc{padding:56px 0 96px}.doc h1{font-size:clamp(36px,5vw,52px);font-weight:900;letter-spacing:-1.8px;line-height:1.05;margin:0 0 8px}.doc .updated{color:var(--text-muted);font-size:13px;font-weight:700;margin-bottom:32px;letter-spacing:.2px}.doc h2{font-size:22px;font-weight:900;letter-spacing:-.6px;margin:40px 0 12px}.doc h3{font-size:16px;font-weight:800;letter-spacing:-.3px;margin:24px 0 6px}.doc li,.doc p{color:var(--text-secondary);font-size:15.5px;line-height:1.65;font-weight:500}.doc strong{color:var(--text-primary);font-weight:800}.doc ol,.doc ul{padding-left:22px}.doc li{margin-bottom:8px}.callout{background:var(--accent-soft);border:1px solid rgba(0,201,167,.25);border-radius:var(--radius-lg);padding:18px 20px;color:var(--text-primary);font-weight:600;margin:24px 0}.callout strong{font-weight:800}.kv-table{width:100%;border-collapse:collapse;margin:16px 0 24px;font-size:14.5px}.kv-table td,.kv-table th{text-align:left;padding:12px 14px;border-bottom:1px solid var(--border);vertical-align:top}.kv-table th{background:var(--surface-muted);font-weight:800;color:var(--text-primary);letter-spacing:-.2px}.kv-table td{color:var(--text-secondary);font-weight:500}.kv-table tr:last-child td{border-bottom:none}.faq{border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;background:var(--surface);box-shadow:var(--shadow-card)}.faq details{border-bottom:1px solid var(--border)}.faq details:last-child{border-bottom:none}.faq summary{padding:18px 20px;font-weight:800;cursor:pointer;list-style:none;font-size:15.5px;color:var(--text-primary);display:flex;justify-content:space-between;align-items:center;letter-spacing:-.3px}.faq summary::-webkit-details-marker{display:none}.faq summary:after{content:"+";color:var(--accent-deep);font-size:22px;font-weight:800;transition:transform .2s ease}.faq details[open] summary:after{transform:rotate(45deg)}.faq details[open] summary{background:var(--surface-muted)}.faq .body{padding:0 20px 20px;color:var(--text-secondary);font-size:15px;font-weight:500;line-height:1.65}.site-footer{padding:48px 0 64px;border-top:1px solid var(--border);background:var(--bg-soft);font-size:13.5px;color:var(--text-muted)}.site-footer .container{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px}.site-footer nav{display:flex;gap:20px}.site-footer nav a{color:var(--text-secondary);font-weight:700}.site-footer nav a:hover{color:var(--text-primary);text-decoration:none}.site-footer .copy{color:var(--text-muted);font-weight:600}@media (max-width:600px){.hero{padding:40px 0 64px}.section{padding:64px 0}.doc{padding:32px 0 64px}.sparkle{display:none}.site-header .container{flex-direction:column;align-items:flex-start}.site-footer .container{justify-content:flex-start}}