.neo-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;cursor:pointer;font-family:inherit;font-weight:700;line-height:1;text-decoration:none;transition:all .15s ease;position:relative;white-space:nowrap;-webkit-user-select:none;-moz-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent}.neo-button:focus-visible{outline:2px solid #6366f1;outline-offset:2px}.neo-button--sm{padding:8px 16px;font-size:13px;gap:6px}.neo-button--md{padding:12px 24px;font-size:14px}.neo-button--lg{padding:16px 32px;font-size:16px}.neo-button--full{width:100%}.neo-button--disabled{opacity:.5;cursor:not-allowed;pointer-events:none}.neo-button__spinner{animation:neo-btn-spin .8s linear infinite}@keyframes neo-btn-spin{to{transform:rotate(360deg)}}.neo-button__icon{display:inline-flex;align-items:center;flex-shrink:0}.neo-button--neo{border-radius:12px;font-weight:600;box-shadow:0 2px 4px #0000000d;transition:all .2s ease}.neo-button--neo:hover:not(.neo-button--disabled){opacity:.9;transform:translateY(-1px)}.neo-button--neo:active:not(.neo-button--disabled){transform:translateY(1px);box-shadow:none}.neo-button--neo.neo-button--icon{padding:8px}.neo-button--neo.neo-button--outline{background:transparent;box-shadow:inset 0 0 0 1.5px var(--border-subtle)}.neo-button--neo.neo-button--ghost{background:transparent;border-color:transparent;box-shadow:none}.neo-button--neo.neo-button--ghost:hover:not(.neo-button--disabled){background:var(--bg-overlay-hover)}.neo-button--neo.neo-button--solid.neo-button--primary{background:var(--brand-gradient);color:var(--text-btn)}.neo-button--neo.neo-button--solid.neo-button--secondary{background:var(--bg-overlay);color:var(--text-primary);box-shadow:inset 0 0 0 1px var(--border-subtle)}.neo-button--neo.neo-button--solid.neo-button--secondary:hover:not(.neo-button--disabled){background:var(--bg-overlay-hover)}.neo-button--neo.neo-button--solid.neo-button--success{background:var(--quiz-correct-from);color:var(--text-btn)}.neo-button--neo.neo-button--solid.neo-button--danger{background:var(--quiz-wrong-from);color:var(--text-btn)}.neo-button--neo.neo-button--solid.neo-button--warning{background:var(--quiz-ans4-from, #f59e0b);color:var(--text-btn)}.neo-button--neo.neo-button--solid.neo-button--blue{background:var(--brand-blue);color:var(--text-btn)}.neo-button--neo.neo-button--solid.neo-button--pink{background:var(--quiz-ans3-from);color:var(--text-btn)}.neo-button--neo.neo-button--solid.neo-button--teal{background:var(--brand-cyan);color:var(--text-btn)}.neo-button--neo.neo-button--solid.neo-button--orange{background:var(--quiz-ans4-to);color:var(--text-btn)}.neo-button--neo.neo-button--solid.neo-button--white{background:var(--text-primary);color:var(--bg-main)}.neo-button--neo.neo-button--solid.neo-button--yellow{background:var(--quiz-point-bg);color:var(--quiz-point-color)}.neo-button--neo.neo-button--solid.neo-button--purple{background:var(--brand-violet);color:var(--text-btn)}.neo-button--neo.neo-button--icon.neo-button--white{background:var(--text-primary);color:var(--bg-main)}.neo-button--neo.neo-button--icon.neo-button--primary{background:var(--brand-gradient);color:var(--text-btn)}.neo-button--session{border-radius:14px;font-family:inherit}.neo-button--session.neo-button--solid.neo-button--primary{background:var(--brand-gradient);color:var(--text-btn);box-shadow:var(--glow-primary)}.neo-button--session.neo-button--solid.neo-button--primary:hover:not(.neo-button--disabled){transform:translateY(-2px);box-shadow:0 8px 20px var(--border-focus)}.neo-button--session.neo-button--solid.neo-button--success{background:linear-gradient(135deg,var(--quiz-correct-from),var(--quiz-correct-to));color:var(--text-btn);box-shadow:0 4px 16px #10b9814d}.neo-button--session.neo-button--solid.neo-button--success:hover:not(.neo-button--disabled){transform:translateY(-2px);box-shadow:0 8px 24px #10b98166}.neo-button--session.neo-button--solid.neo-button--purple{background:var(--brand-gradient);color:var(--text-btn);box-shadow:var(--glow-primary)}.neo-button--session.neo-button--solid.neo-button--purple:hover:not(.neo-button--disabled){transform:translateY(-2px);box-shadow:0 8px 24px #a855f766}.neo-button--session.neo-button--solid.neo-button--danger{background:linear-gradient(135deg,var(--quiz-wrong-from),var(--quiz-wrong-to));color:var(--text-btn);box-shadow:0 4px 12px #ef44444d}.neo-button--session.neo-button--solid.neo-button--danger:hover:not(.neo-button--disabled){transform:translateY(-2px);box-shadow:0 8px 20px #ef444466}.neo-button--session.neo-button--solid.neo-button--warning{background:linear-gradient(135deg,var(--quiz-ans4-from),var(--quiz-ans4-to));color:var(--text-btn);box-shadow:0 4px 12px #f59e0b4d}.neo-button--session.neo-button--solid.neo-button--warning:hover:not(.neo-button--disabled){transform:translateY(-2px);box-shadow:0 8px 20px #f59e0b66}.neo-button--session.neo-button--solid.neo-button--blue{background:linear-gradient(135deg,var(--quiz-ans1-from),var(--quiz-ans1-to));color:var(--text-btn);box-shadow:0 4px 12px #3b82f64d}.neo-button--session.neo-button--solid.neo-button--blue:hover:not(.neo-button--disabled){transform:translateY(-2px);box-shadow:0 8px 20px #3b82f666}.neo-button--session.neo-button--solid.neo-button--pink{background:linear-gradient(135deg,var(--quiz-ans3-from),var(--quiz-ans3-to));color:var(--text-btn);box-shadow:0 4px 12px #ec48994d}.neo-button--session.neo-button--solid.neo-button--teal{background:linear-gradient(135deg,var(--quiz-ans2-from),var(--quiz-ans2-to));color:var(--text-btn);box-shadow:0 4px 12px #14b8a64d}.neo-button--session.neo-button--solid.neo-button--orange{background:linear-gradient(135deg,var(--quiz-ans4-to),var(--quiz-ans4-from));color:var(--text-btn);box-shadow:0 4px 12px #f973164d}.neo-button--session.neo-button--solid.neo-button--white{background:var(--bg-overlay-hover);color:var(--text-primary);box-shadow:inset 0 0 0 1px var(--border-subtle)}.neo-button--session.neo-button--solid.neo-button--white:hover:not(.neo-button--disabled){background:var(--bg-overlay-active)}.neo-button--session.neo-button--solid.neo-button--yellow{background:var(--quiz-point-bg);color:var(--quiz-point-color);box-shadow:0 4px 12px #fbbf2433}.neo-button--session.neo-button--solid.neo-button--secondary{background:var(--bg-overlay);color:var(--text-secondary);box-shadow:inset 0 0 0 1px var(--border-subtle)}.neo-button--session.neo-button--solid.neo-button--secondary:hover:not(.neo-button--disabled){background:var(--bg-overlay-hover);color:var(--text-primary)}.neo-button--session.neo-button--outline{background:var(--bg-overlay);color:var(--text-secondary);box-shadow:inset 0 0 0 1.5px var(--border-subtle)}.neo-button--session.neo-button--outline:hover:not(.neo-button--disabled){background:var(--bg-overlay-hover);color:var(--text-primary)}.neo-button--session.neo-button--ghost{background:transparent;color:var(--text-secondary);padding-inline:16px;font-size:13px}.neo-button--session.neo-button--ghost:hover:not(.neo-button--disabled){color:var(--text-primary)}.neo-button--session.neo-button--icon{padding:8px;background:var(--bg-overlay);color:var(--text-secondary);box-shadow:inset 0 0 0 1px var(--border-subtle);border-radius:10px}.neo-button--session.neo-button--icon:hover:not(.neo-button--disabled){background:var(--bg-overlay-hover);color:var(--text-primary)}@media(hover:none){.neo-button--neo:active:not(.neo-button--disabled){transform:translateY(1px)}}.app-header{display:flex;align-items:center;justify-content:space-between;padding:8px 16px;position:sticky;top:0;z-index:100;background:var(--header-bg, var(--bg-glass),.5);backdrop-filter:blur(12px);border-bottom:1px solid var(--header-border, var(--border-subtle));color:var(--header-text, var(--text-primary));min-height:52px;width:100%}.app-header .app-logo-text{background:none!important;-webkit-background-clip:unset!important;-webkit-text-fill-color:var(--header-text, var(--text-primary))!important;background-clip:unset!important}.app-header__left{display:flex;align-items:center;gap:8px;flex:1;min-width:0}.app-header__center{display:flex;align-items:center;justify-content:center;position:absolute;left:50%;transform:translate(-50%);pointer-events:auto}.app-header__right{display:flex;align-items:center;gap:8px;flex:1;justify-content:flex-end;min-width:0}@media(max-width:600px){.app-header{padding:8px 10px}}[data-theme=light] .app-header .neo-btn--outline{border-color:#ffffff59;color:#fff}[data-theme=light] .app-header .neo-btn--outline:hover{background:#ffffff26;border-color:#ffffff80}[data-theme=light] .app-header .neo-btn--ghost{color:#ffffffd9}[data-theme=light] .app-header .neo-btn--ghost:hover{background:#ffffff1f;color:#fff}