:root{--green: #58cc02;--green-dark: #4caf00;--green-shadow: #58a700;--blue: #1cb0f6;--blue-shadow: #1899d6;--red: #ff4b4b;--red-shadow: #e63f3f;--yellow: #ffc800;--purple: #ce82ff;--bg: #fdfbf4;--card: #ffffff;--line: #e5e5e5;--line-dark: #cfcfcf;--text: #3c3c3c;--muted: #9a9a9a;--radius: 16px;font-family:Nunito,ui-rounded,Segoe UI Rounded,system-ui,-apple-system,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);-webkit-tap-highlight-color:transparent;overscroll-behavior:none}.app{max-width:480px;margin:0 auto;min-height:100%;display:flex;flex-direction:column;padding:calc(env(safe-area-inset-top) + 10px) 16px calc(env(safe-area-inset-bottom) + 16px)}.header{display:flex;align-items:center;gap:10px;margin-bottom:14px}.header .spacer{flex:1}.pill{display:inline-flex;align-items:center;gap:5px;font-weight:800;font-size:15px;padding:4px 10px;border-radius:999px;background:#fff;border:2px solid var(--line)}.pill.streak{color:#ff9600}.pill.xp{color:#ffb400}.icon-btn{border:2px solid var(--line);background:#fff;border-radius:12px;width:42px;height:42px;font-size:20px;cursor:pointer}.hearts{color:var(--red);font-size:18px;letter-spacing:1px}.lesson-bar{flex:1;height:16px;background:var(--line);border-radius:999px;overflow:hidden}.lesson-bar>div{height:100%;background:var(--green);border-radius:999px;transition:width .3s ease}.btn{border:none;border-radius:var(--radius);font-weight:800;font-size:17px;letter-spacing:.5px;padding:15px 18px;cursor:pointer;color:#fff;text-transform:uppercase;box-shadow:0 4px 0 var(--green-shadow);background:var(--green);transition:transform .05s,box-shadow .05s;width:100%}.btn:active{transform:translateY(4px);box-shadow:none}.btn.blue{background:var(--blue);box-shadow:0 4px 0 var(--blue-shadow)}.btn.red{background:var(--red);box-shadow:0 4px 0 var(--red-shadow)}.btn.ghost{background:#fff;color:var(--muted);border:2px solid var(--line);box-shadow:0 4px 0 var(--line)}.btn:disabled{opacity:.5;box-shadow:none;cursor:default;transform:none}.lesson{display:flex;flex-direction:column;flex:1}.prompt{font-size:20px;font-weight:800;margin:8px 0 20px;line-height:1.3}.play-btn{align-self:center;width:150px;height:150px;border-radius:50%;border:none;background:var(--blue);box-shadow:0 6px 0 var(--blue-shadow);color:#fff;font-size:60px;cursor:pointer;margin:10px 0 8px;transition:transform .05s,box-shadow .05s}.play-btn:active{transform:translateY(5px);box-shadow:none}.play-btn.playing{animation:pulse 1s ease-in-out infinite}@keyframes pulse{50%{transform:scale(1.05)}}.replay{text-align:center;color:var(--muted);font-weight:700;margin-bottom:10px}.choices{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:auto}.choice{padding:16px 10px;border-radius:14px;border:2px solid var(--line);border-bottom-width:4px;background:#fff;font-weight:800;font-size:16px;color:var(--text);cursor:pointer;min-height:58px}.choice:active{border-bottom-width:2px}.choice.correct{background:#d7ffb8;border-color:var(--green);color:#58a700}.choice.wrong{background:#ffdfe0;border-color:var(--red);color:var(--red)}.choice.dim{opacity:.5}.choice:disabled{cursor:default}.feedback{position:sticky;bottom:0;margin-top:16px;padding:16px;border-radius:16px;font-weight:800}.feedback.good{background:#d7ffb8;color:#58a700}.feedback.bad{background:#ffdfe0;color:var(--red)}.feedback .ans{font-weight:800}.feedback .sub{font-weight:700;font-size:14px;opacity:.9}.gate{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:14px}.gate .logo{font-size:72px}.gate h1{font-size:30px;margin:0}.gate p{color:var(--muted);font-weight:700;margin:0 0 10px;max-width:300px}.tiers{display:flex;flex-direction:column;gap:10px;width:100%}.tier-card{text-align:left;border:2px solid var(--line);border-bottom-width:4px;background:#fff;border-radius:16px;padding:14px 16px;cursor:pointer;width:100%}.tier-card.active{border-color:var(--green);background:#f3ffe9}.tier-card .t-title{font-weight:800;font-size:17px}.tier-card .t-blurb{color:var(--muted);font-weight:700;font-size:13px;margin-top:2px}.summary{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:10px}.summary .big{font-size:80px}.summary h2{font-size:26px;margin:0}.stat-row{display:flex;gap:12px;width:100%;margin:14px 0}.stat{flex:1;border:2px solid var(--line);border-radius:14px;padding:12px;font-weight:800}.stat .v{font-size:24px}.stat .k{color:var(--muted);font-size:12px;text-transform:uppercase}.cat-breakdown{width:100%;text-align:left;margin-bottom:10px}.cat-breakdown .row{display:flex;justify-content:space-between;font-weight:700;padding:6px 0;border-bottom:1px solid var(--line)}.progress-screen{flex:1}.progress-screen h2{font-size:24px}.section{background:#fff;border:2px solid var(--line);border-radius:16px;padding:14px;margin-bottom:16px}.section h3{margin:0 0 10px;font-size:15px;text-transform:uppercase;color:var(--muted)}.empty{color:var(--muted);font-weight:700;text-align:center;padding:20px}.credit{color:var(--muted);font-size:11px;text-align:center;margin-top:10px;line-height:1.5}.credit a{color:var(--muted)}.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%);background:#333;color:#fff;font-weight:700;padding:10px 16px;border-radius:12px;font-size:14px;z-index:50}