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solid #e2e8f0;background:#fff;font-size:.82rem;font-weight:700;color:#1e3a5f;cursor:pointer;font-family:inherit}.vk-pill.is-on{border-color:#63adff;background:rgba(99,173,255,.12);color:#4a97f0}.vk-pill:disabled{opacity:.45;cursor:not-allowed}.vk-modal-actions{display:flex;gap:10px;margin-top:16px}.vk-timer{font-weight:900;font-size:.9rem;color:#fff}.vk-timer.is-urgent{color:#fee2e2}.vk-overlay-loader{position:fixed;inset:0;z-index:300;background:rgba(15,23,42,.45);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700}.vk-confirm-actions{display:flex;flex-direction:column;gap:8px;margin-top:16px}.vk-btn-danger{padding:14px;border:none;border-radius:16px;background:#dc2626;color:#fff;font-weight:800;cursor:pointer;font-family:inherit}@media (min-width:768px){.vk-study-body{padding-top:28px}.vk-flip-card,.vk-flip-inner,.vk-flip-stack{min-height:360px}}