:root{--bg-start: #0f172a;--bg-end: #1e293b;--card-bg: #1e293b;--card-border: #334155;--surface: #0f172a;--text-primary: #f1f5f9;--text-secondary: #94a3b8;--text-muted: #64748b;--accent: #38bdf8;--accent-glow: rgba(56, 189, 248, .15);--correct: #4ade80;--correct-bg: rgba(74, 222, 128, .1);--incorrect: #f87171;--incorrect-bg: rgba(248, 113, 113, .1);--tone1: #d99a9a;--tone2: #d9bd8f;--tone3: #9cc2a8;--tone4: #9fb2da;--radius: 16px;--radius-sm: 10px;--shadow: 0 4px 24px rgba(0, 0, 0, .3)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:DM Sans,Noto Sans SC,sans-serif;background:linear-gradient(160deg,var(--bg-start),var(--bg-end));min-height:100vh;color:var(--text-primary);overflow-x:hidden}body:before{content:"";position:fixed;top:-40%;left:-20%;width:60%;height:80%;background:radial-gradient(circle,rgba(56,189,248,.06) 0%,transparent 70%);pointer-events:none;z-index:0}.app-shell{position:relative;z-index:1;max-width:640px;margin:0 auto;padding:24px 16px 48px}.shell-top-center{min-height:100vh;display:flex;flex-direction:column}.shell-top-center>:nth-child(2){margin-top:auto}.shell-top-center:after{content:"";margin-bottom:auto}.practice-shell:before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(900px 520px at 50% -10%,rgba(129,110,247,.22),transparent 60%),radial-gradient(760px 480px at 95% 112%,rgba(56,189,248,.12),transparent 58%),linear-gradient(165deg,#0a0e1f,#121833 52%,#0b1124)}.prac-focus{align-self:center;display:inline-flex;align-items:center;gap:6px;margin-bottom:14px;padding:6px 14px;border-radius:999px;font-size:.78rem;font-weight:600;color:#c7b8ff;background:#816ef724;border:1px solid rgba(129,110,247,.34)}.prac-focus strong{color:#fff;font-weight:700}.account-bar{position:fixed;top:14px;left:0;right:0;z-index:100;max-width:640px;margin:0 auto;padding:0 16px;display:flex;justify-content:flex-end;gap:8px;align-items:center;pointer-events:none}.acct-link{pointer-events:auto;display:inline-flex;align-items:center;gap:6px;background:#1e293b8c;border:1px solid var(--card-border);border-radius:18px;color:var(--text-secondary);font-family:inherit;font-size:.76rem;font-weight:600;cursor:pointer;padding:7px 13px;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);transition:border-color .18s,color .18s,background .18s}.acct-link svg{opacity:.85}.acct-link:hover{border-color:var(--accent);color:var(--accent);background:#1e293bcc}@media(max-width:480px){.account-bar{top:10px;gap:6px;padding:0 10px}.acct-link{padding:6px 11px;font-size:.72rem}}.btn-link{background:none;border:none;color:var(--text-secondary);font-family:inherit;font-size:.85rem;text-decoration:underline;cursor:pointer;padding:4px 0;transition:color .2s}.btn-link:hover{color:var(--accent)}.guest-pill{position:fixed;bottom:14px;left:50%;transform:translate(-50%);z-index:100;background:#1e293bd9;border:1px solid rgba(237,161,0,.55);border-radius:18px;color:var(--text-secondary);font-family:inherit;font-size:.76rem;cursor:pointer;padding:8px 14px;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);white-space:nowrap;transition:border-color .18s,color .18s}.guest-pill strong{color:var(--accent)}.guest-pill:hover{border-color:var(--accent);color:var(--text-primary)}@media(max-width:480px){.guest-pill{font-size:.7rem;padding:7px 12px;bottom:10px}}.back-row{display:flex;margin-bottom:12px}.back-home-btn{display:inline-flex;align-items:center;gap:6px;background:var(--surface);border:1px solid var(--card-border);color:var(--text-secondary);padding:6px 14px;border-radius:20px;font-family:inherit;font-size:.82rem;font-weight:600;cursor:pointer;transition:all .2s;-webkit-tap-highlight-color:transparent}.back-home-btn:hover{border-color:var(--accent);color:var(--accent)}.app-logo{display:inline-block;margin-bottom:20px;padding:6px 14px;font-family:inherit;font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.16em;color:var(--accent);background:var(--accent-glow);border:1px solid rgba(56,189,248,.3);border-radius:20px;cursor:pointer;transition:all .2s;-webkit-tap-highlight-color:transparent}.app-logo:hover{background:#38bdf838;border-color:var(--accent)}.back-row .app-logo{margin-bottom:0}.title-badge{display:inline-flex;align-items:center;justify-content:center;width:1.5em;height:1.5em;margin-right:.4em;border-radius:.32em;background:var(--accent-glow);border:1px solid rgba(56,189,248,.4);color:var(--accent);-webkit-text-fill-color:var(--accent);font-size:.66em;font-weight:700;vertical-align:middle}.loader-overlay{position:fixed;inset:0;z-index:200;display:flex;align-items:center;justify-content:center;background:linear-gradient(160deg,var(--bg-start),var(--bg-end))}.loader-spinner{width:44px;height:44px;border-radius:50%;border:3px solid var(--card-border);border-top-color:var(--accent);animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.badge{display:inline-block;padding:4px 14px;background:var(--accent-glow);border:1px solid rgba(56,189,248,.25);border-radius:20px;font-size:.75rem;font-weight:500;color:var(--accent);letter-spacing:.06em;text-transform:uppercase}.card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius);padding:32px 24px;box-shadow:var(--shadow)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:14px 24px;border:none;border-radius:var(--radius-sm);font-family:inherit;font-size:.95rem;font-weight:600;cursor:pointer;transition:all .2s ease}.btn:hover{transform:translateY(-2px)}.btn-primary{background:linear-gradient(135deg,#7dd3fc,#38bdf8);color:#0c1424}.btn-primary:hover{box-shadow:0 8px 24px #38bdf866}.btn-secondary{background:var(--surface);border:1px solid var(--card-border);color:var(--text-primary)}.btn-lg{padding:16px 48px;font-size:1.05rem;font-weight:700}@keyframes cardIn{0%{opacity:0;transform:translateY(16px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes pulse-ring{0%{box-shadow:0 0 #38bdf866}to{box-shadow:0 0 0 24px #38bdf800}}.animate-in{animation:cardIn .4s ease-out}.feedback-toast{position:fixed;top:20px;left:50%;transform:translate(-50%) translateY(-80px);padding:12px 28px;border-radius:40px;font-weight:600;font-size:.95rem;z-index:100;pointer-events:none;opacity:0;transition:all .35s cubic-bezier(.22,1,.36,1);white-space:nowrap}.feedback-toast.show{opacity:1;transform:translate(-50%) translateY(0)}.feedback-toast.correct{background:var(--correct);color:#052e16}.feedback-toast.incorrect{background:var(--incorrect);color:#450a0a}.hidden{display:none!important}.text-center{text-align:center}@media(max-width:480px){.app-shell{padding:16px 12px 40px}.card{padding:24px 16px}}