.social-icons a {
    color: #ffffff;
}

.social-icons a:hover {
    opacity: 0.8;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.input-group input {
    flex: 1;
}

.circle-btn {
    flex: 0 0 45px;
    width: 45px;
    height: 45px;
    padding: 0;
    display: none;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: none;
}

.circle-btn svg {
    width: 24px;
    height: 24px;
    display: block;
}

.circle-btn path {
    stroke: #212121;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.submit-btn {
    position: relative;
}

.submit-btn .btn-spinner {
    display: none;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(33,33,33,0.25);
    border-top-color: #212121;
    border-radius: 50%;
    animation: btnspin 0.8s linear infinite;
}

.submit-btn.is-loading svg {
    display: none;
}

.submit-btn.is-loading .btn-spinner {
    display: inline-block;
}

.submit-btn.is-loading {
    pointer-events: none;
    opacity: 0.85;
}

@keyframes btnspin {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}

.social-icons a {
    color: #ffffff;
}

.social-icons a:hover {
    opacity: 0.8;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.input-group input {
    flex: 1;
}

.circle-btn {
    flex: 0 0 45px;
    width: 45px;
    height: 45px;
    padding: 0;
    display: none; /* по умолчанию скрыта */
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: none;
}

.circle-btn svg {
    width: 24px;
    height: 24px;
    display: block;
}

.circle-btn path {
    stroke: #212121;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.button.start {
    position: relative;
    overflow: hidden;
}

.button.start::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -100%;
    width: 50%;
    height: 200%;
    background: linear-gradient(
        to right,
        rgba(255, 255, 255, 0) 0%,
        rgba(255, 255, 255, 0.5) 50%,
        rgba(255, 255, 255, 0) 100%
    );
    transform: rotate(25deg);
    animation: shine 1750ms infinite;
    filter: blur(3px);
}

.button.start::after {
    content: '';
    position: absolute;
    inset: -2px;
    background: inherit;
    filter: blur(5px);
    opacity: 0.7;
    z-index: -1;
}

@keyframes shine {
    0% {
        left: -100%;
    }
    100% {
        left: 200%;
    }
}