/* TheraLink — ECG heartbeat loader for auth / submit buttons */

.tl-heartbeat-loader {
    --tl-heartbeat-color: #4CAF93;
    --tl-heartbeat-height: 3rem;
    --tl-heartbeat-width: 6.5rem;
    --tl-heartbeat-inset-x: 1.25rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    vertical-align: middle;
    line-height: 0;
    box-sizing: border-box;
    color: var(--tl-heartbeat-color);
}

/* Slightly brighter green on blue primary buttons (#207FBF) */
.tl-heartbeat-loader--on-primary {
    --tl-heartbeat-color: #6FE0B8;
}

.tl-heartbeat-loader__sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.tl-heartbeat-loader__svg {
    display: block;
    overflow: visible;
    max-width: 100%;
    max-height: 100%;
}

/* Compact centered heartbeat */
.tl-heartbeat-loader--sm {
    width: min(var(--tl-heartbeat-width), 100%);
    height: var(--tl-heartbeat-height);
    max-width: calc(100% - (var(--tl-heartbeat-inset-x) * 2));
}

.tl-heartbeat-loader--sm .tl-heartbeat-loader__svg {
    width: 100%;
    height: 100%;
}

/* Centered sweep inside submit buttons — inset from left/right borders */
.tl-heartbeat-loader--md {
    width: min(18rem, calc(100% - (var(--tl-heartbeat-inset-x) * 2)));
    height: 1.75rem;
    max-height: calc(100% - 0.5rem);
    margin-inline: auto;
}

.tl-heartbeat-loader--md .tl-heartbeat-loader__svg {
    width: 100%;
    height: 100%;
}

.tl-heartbeat-loader--lg {
    width: min(22rem, calc(100% - (var(--tl-heartbeat-inset-x) * 2)));
    height: 2rem;
    max-height: calc(100% - 0.5rem);
    margin-inline: auto;
}

.tl-heartbeat-loader--lg .tl-heartbeat-loader__svg {
    width: 100%;
    height: 100%;
}

.tl-heartbeat-loader__underlay {
    opacity: 0.35;
}

.tl-heartbeat-loader__trace {
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
    animation: tl-heartbeat-draw 1.4s linear infinite;
}

@keyframes tl-heartbeat-draw {
    0% {
        stroke-dashoffset: 100;
        opacity: 0.45;
    }

    12% {
        opacity: 1;
    }

    78% {
        stroke-dashoffset: 0;
        opacity: 1;
    }

    100% {
        stroke-dashoffset: 0;
        opacity: 0.35;
    }
}

@media (max-width: 480px) {
    .tl-heartbeat-loader {
        --tl-heartbeat-inset-x: 0.625rem;
        --tl-heartbeat-width: 5.25rem;
    }

    .tl-heartbeat-loader--sm {
        height: 2.5rem;
    }

    .tl-heartbeat-loader--md {
        width: calc(100% - (var(--tl-heartbeat-inset-x) * 2));
        height: 1.5rem;
        max-height: calc(100% - 0.375rem);
    }

    .tl-heartbeat-loader--lg {
        width: calc(100% - (var(--tl-heartbeat-inset-x) * 2));
        height: 1.625rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .tl-heartbeat-loader__trace {
        animation: none;
        stroke-dashoffset: 0;
        opacity: 1;
    }
}