:root {
    --bg: #07111f;
    --panel: #0d1b2a;
    --panel-light: #12263a;
    --primary: #16c7ff;
    --primary-soft: #73dcff;
    --text: #f5f9ff;
    --muted: #8fa6bb;
    --border: rgba(255, 255, 255, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: Arial, Helvetica, sans-serif;
    color: var(--text);
    background:
        radial-gradient(
            circle at top,
            #123451 0%,
            var(--bg) 45%,
            #030912 100%
        );
}

.page {
    width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    text-align: center;
    padding: 34px 20px 18px;
}

.brand {
    margin: 0;
    font-size: 36px;
    font-weight: 800;
    letter-spacing: -1px;
}

.brand span {
    color: var(--primary);
}

.subtitle {
    margin: 8px 0 0;
    color: var(--muted);
    font-size: 15px;
}

.main {
    width: 100%;
    max-width: 850px;
    margin: 0 auto;
    padding: 20px;
}

.speed-panel {
    border: 1px solid var(--border);
    border-radius: 28px;
    padding: 34px;
    background:
        linear-gradient(
            145deg,
            rgba(18, 38, 58, 0.96),
            rgba(7, 17, 31, 0.96)
        );

    box-shadow:
        0 30px 80px rgba(0, 0, 0, 0.35);
}

.status {
    text-align: center;
    min-height: 24px;
    margin: 0 0 25px;
    color: var(--muted);
    font-size: 15px;
}


/* ==========================
   VELOCIDADE PRINCIPAL
   ========================== */

.speed-display {
    text-align: center;
    padding: 15px 0 35px;
}

.speed-label {
    color: var(--muted);
    text-transform: uppercase;
    font-size: 13px;
    letter-spacing: 2px;
}

.speed-number {
    margin-top: 5px;
    font-size: 76px;
    line-height: 1;
    font-weight: 800;
    color: var(--primary);
}

.speed-unit {
    margin-top: 8px;
    color: var(--muted);
    font-size: 17px;
}


/* ==========================
   RESULTADOS
   ========================== */

.results {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.result-card {
    padding: 20px 10px;
    text-align: center;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
}

.result-title {
    color: var(--muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.result-value {
    margin-top: 9px;
    font-size: 24px;
    font-weight: 700;
}

.result-unit {
    margin-left: 3px;
    color: var(--muted);
    font-size: 12px;
}


/* ==========================
   BOTÃO
   ========================== */

.action {
    text-align: center;
    margin-top: 32px;
}

.start-button {
    min-width: 220px;
    padding: 17px 30px;

    border: none;
    border-radius: 50px;

    font-size: 15px;
    font-weight: 800;
    letter-spacing: 1px;

    cursor: pointer;

    color: #00131d;
    background:
        linear-gradient(
            135deg,
            var(--primary),
            var(--primary-soft)
        );

    box-shadow:
        0 10px 35px rgba(22, 199, 255, 0.25);

    transition:
        transform 0.2s,
        box-shadow 0.2s,
        opacity 0.2s;
}

.start-button:hover {
    transform: translateY(-2px);

    box-shadow:
        0 14px 40px rgba(22, 199, 255, 0.35);
}

.start-button:disabled {
    cursor: not-allowed;
    opacity: 0.45;
    transform: none;
}


/* ==========================
   RODAPÉ
   ========================== */

.footer {
    margin-top: auto;
    padding: 30px 20px;
    text-align: center;
    color: #62778a;
    font-size: 12px;
}


/* ==========================
   CELULAR
   ========================== */

@media (max-width: 650px) {

    .header {
        padding-top: 25px;
    }

    .brand {
        font-size: 30px;
    }

    .main {
        padding: 12px;
    }

    .speed-panel {
        padding: 25px 14px;
        border-radius: 22px;
    }

    .speed-number {
        font-size: 60px;
    }

    .results {
        grid-template-columns: repeat(2, 1fr);
    }

    .result-value {
        font-size: 21px;
    }

    .start-button {
        width: 100%;
    }
}