html.dsf-math-guard-open { overflow: hidden; }
.dsf-math-guard[hidden] { display: none !important; }
.dsf-math-guard { position: fixed; inset: 0; z-index: 999999; display: grid; place-items: center; padding: 20px; font-family: inherit; }
.dsf-math-guard__backdrop { position: absolute; inset: 0; background: rgba(10, 15, 25, .62); backdrop-filter: blur(4px); }
.dsf-math-guard__dialog { position: relative; width: min(100%, 440px); box-sizing: border-box; padding: 34px; border-radius: 18px; background: #fff; color: #171717; box-shadow: 0 24px 70px rgba(0,0,0,.22); text-align: center; animation: dsfMathIn .2s ease-out; }
.dsf-math-guard__close { position: absolute; top: 12px; right: 14px; width: 36px; height: 36px; padding: 0; border: 0; border-radius: 50%; background: transparent; color: #555; font-size: 28px; line-height: 1; cursor: pointer; }
.dsf-math-guard__close:hover { background: #f1f3f5; }
.dsf-math-guard__icon { display: grid; place-items: center; width: 48px; height: 48px; margin: 0 auto 16px; border-radius: 50%; background: #eef8f1; color: #218443; font-weight: 800; font-size: 22px; }
.dsf-math-guard h2 { margin: 0 0 8px; font: inherit; font-size: clamp(22px, 4vw, 28px); font-weight: 750; line-height: 1.2; color: inherit; }
.dsf-math-guard__description { margin: 0 0 22px; color: #666; font-size: 15px; line-height: 1.55; }
.dsf-math-guard__question { min-height: 44px; margin: 0 0 16px; font-size: 30px; line-height: 1.35; font-weight: 800; letter-spacing: .02em; }
.dsf-math-guard__label { display: block; text-align: left; }
.dsf-math-guard__label span { display: block; margin-bottom: 7px; color: #444; font-size: 13px; font-weight: 650; }
.dsf-math-guard__label input { display: block; width: 100%; height: 52px; box-sizing: border-box; padding: 0 15px; border: 1px solid #ccd1d8; border-radius: 10px; background: #fff; color: #111; font: inherit; font-size: 18px; text-align: center; outline: none; }
.dsf-math-guard__label input:focus { border-color: #20252c; box-shadow: 0 0 0 3px rgba(32,37,44,.1); }
.dsf-math-guard__error { min-height: 21px; margin: 9px 0; color: #b42318; font-size: 13px; line-height: 1.4; }
.dsf-math-guard__confirm { width: 100%; min-height: 52px; padding: 12px 20px; border: 0; border-radius: 10px; background: #171717; color: #fff; font: inherit; font-size: 15px; font-weight: 700; cursor: pointer; transition: transform .15s ease, opacity .15s ease; }
.dsf-math-guard__confirm:hover { transform: translateY(-1px); }
.dsf-math-guard__confirm:disabled { opacity: .55; cursor: wait; transform: none; }
@keyframes dsfMathIn { from { opacity: 0; transform: translateY(10px) scale(.98); } to { opacity: 1; transform: none; } }
@media (max-width: 520px) { .dsf-math-guard { padding: 14px; } .dsf-math-guard__dialog { padding: 30px 20px 22px; border-radius: 15px; } }
@media (prefers-reduced-motion: reduce) { .dsf-math-guard__dialog { animation: none; } .dsf-math-guard__confirm { transition: none; } }