:root{--radius: 18px;--radius-sm: 12px;--accent: #4f46e5;--accent-ink: #ffffff;--accent-soft: rgba(79, 70, 229, .14);--accent-line: rgba(79, 70, 229, .42);--surface: radial-gradient(120% 90% at 12% -10%, #eceefc, #f5f6fa);--card: #ffffff;--card-border: rgba(15, 23, 42, .08);--ink: #0f172a;--ink-soft: #475569;--ink-muted: #64748b;--field: #ffffff;--field-border: rgba(15, 23, 42, .16);--shadow: 0 10px 30px rgba(15, 23, 42, .07)}[data-theme=dark]{--card: rgba(255, 255, 255, .07);--card-border: rgba(255, 255, 255, .12);--ink: #f8fafc;--ink-soft: rgba(248, 250, 252, .82);--ink-muted: rgba(248, 250, 252, .58);--field: rgba(255, 255, 255, .06);--field-border: rgba(255, 255, 255, .18);--shadow: 0 10px 34px rgba(0, 0, 0, .35)}*{box-sizing:border-box}html,body,#app{min-height:100%}body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased;color:var(--ink)}.fb-app{min-height:100vh;background:var(--surface);background-attachment:fixed;color:var(--ink);display:flex;flex-direction:column}.fb-shell{width:100%;max-width:640px;margin:0 auto;padding:20px 16px 96px;flex:1}@media (max-width: 380px){.fb-shell{padding:14px 12px 92px}}.fb-header{display:flex;align-items:center;gap:12px;padding:6px 2px 16px}.fb-header__logo{height:34px;max-width:140px;object-fit:contain;display:block}.fb-header__mark{width:34px;height:34px;border-radius:10px;background:var(--accent);flex:none}.fb-header__text{min-width:0}.fb-header__event{font-size:11px;letter-spacing:.09em;text-transform:uppercase;color:var(--ink-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.fb-header__title{font-size:17px;font-weight:700;line-height:1.25}.fb-banner{width:100%;aspect-ratio:16 / 6;border-radius:var(--radius);overflow:hidden;margin-bottom:16px;box-shadow:var(--shadow)}.fb-banner img{width:100%;height:100%;object-fit:cover;display:block}.fb-card{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px;margin-bottom:14px;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.fb-card--center{text-align:center;padding:32px 20px}.fb-intro{color:var(--ink-soft);font-size:14.5px;line-height:1.55;margin:0}.fb-title{font-size:20px;font-weight:700;margin:0 0 8px}.fb-muted{color:var(--ink-muted);font-size:14px;line-height:1.55;margin:0}.fb-error{color:#dc2626;font-size:13.5px;margin:12px 0 0}[data-theme=dark] .fb-error{color:#fca5a5}.fb-progress{margin-bottom:14px}.fb-progress__track{height:6px;border-radius:4px;background:var(--field-border);overflow:hidden}.fb-progress__fill{height:100%;border-radius:4px;background:var(--accent);transition:width .35s ease}.fb-progress__label{font-size:12px;color:var(--ink-muted);margin-top:6px}.fb-q{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px 16px 18px;margin-bottom:12px}.fb-q--answered{border-color:var(--accent-line)}.fb-q--label{background:transparent;border:none;box-shadow:none;padding:8px 2px}.fb-q__index{font-size:11px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-muted);margin-bottom:6px}.fb-prompt{display:block;font-size:15.5px;font-weight:650;line-height:1.4;margin-bottom:12px}.fb-req{color:#dc2626;margin-left:3px}[data-theme=dark] .fb-req{color:#fca5a5}.fb-label{font-weight:600;color:var(--ink-soft);line-height:1.5;margin:0}.fb-input{width:100%;font:inherit;font-size:15px;color:var(--ink);background:var(--field);border:1px solid var(--field-border);border-radius:var(--radius-sm);padding:12px 14px;outline:none;transition:border-color .15s ease,box-shadow .15s ease}.fb-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.fb-input::placeholder{color:var(--ink-muted)}textarea.fb-input{resize:vertical;min-height:88px}.fb-other{margin-top:8px}.fb-choice{display:flex;align-items:flex-start;gap:10px;padding:12px 14px;margin-bottom:8px;border:1px solid var(--field-border);border-radius:var(--radius-sm);background:var(--field);cursor:pointer;font-size:14.5px;line-height:1.45;min-height:46px;transition:border-color .15s ease,background .15s ease}.fb-choice:last-child{margin-bottom:0}.fb-choice:hover{border-color:var(--accent-line)}.fb-choice--on{border-color:var(--accent);background:var(--accent-soft)}.fb-choice input{accent-color:var(--accent);width:18px;height:18px;margin:2px 0 0;flex:none}.fb-consent{align-items:flex-start}.fb-consent__content{font-size:14px;line-height:1.55;color:var(--ink-soft)}.fb-consent__content p{margin:0 0 6px}.fb-consent__content a{color:var(--accent)}.fb-slider{display:block}.fb-slider__row{display:flex;align-items:center;gap:14px}.fb-slider 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env(safe-area-inset-bottom,0px));background:var(--card);border-top:1px solid var(--card-border);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.fb-btn{width:100%;font:inherit;font-size:15.5px;font-weight:700;color:var(--accent-ink);background:var(--accent);border:none;border-radius:var(--radius-sm);padding:14px 18px;cursor:pointer;transition:filter .15s ease,transform .08s ease}.fb-btn:hover:not(:disabled){filter:brightness(1.06)}.fb-btn:active:not(:disabled){transform:translateY(1px)}.fb-btn:disabled{opacity:.55;cursor:not-allowed}.fb-btn--ghost{background:transparent;color:var(--accent);border:1px solid var(--accent-line)}[data-theme=dark] .fb-btn--ghost{color:var(--ink)}.fb-stack{display:grid;gap:10px}.fb-scanner{width:100%;aspect-ratio:1;max-height:320px;border-radius:var(--radius);overflow:hidden;background:#000;position:relative}.fb-scanner 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