<style>
    .signal-card {
        background: #020617;
        border: 1px solid #1e293b;
        border-radius: 14px;
        text-align: center;
    }

    .signal-circle {
        position: relative;
        width: 160px;
        height: 160px;
        margin: 0 auto 15px;
    }

    .signal-circle svg {
        transform: rotate(-90deg);
    }

    .signal-value {
        position: absolute;
        inset: 0;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        font-weight: 700;
        font-size: 1.8rem;
    }

    .signal-value span {
        font-size: 0.75rem;
        font-weight: 500;
        color: #22c55e;
    }

    .signal-note {
        font-size: 0.85rem;
        color: #94a3b8;
    }

    .signal-circle circle:nth-child(2) {
        transition: stroke-dasharray 0.5s ease;
    }
</style>
