* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    font-family: Arial, Helvetica, sans-serif;
    background:
        linear-gradient(
            135deg,
            #eff6ff,
            #f8fafc
        );
    color: #1f2937;
}

.pagina-central {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.cartao-principal {
    width: 100%;
    max-width: 430px;
    padding: 38px 28px;
    text-align: center;
    background: #ffffff;
    border-radius: 24px;
    box-shadow:
        0 18px 45px
        rgba(15, 23, 42, 0.12);
}

.logo {
    width: 76px;
    height: 76px;
    margin: 0 auto 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: #dbeafe;
    font-size: 38px;
}

h1 {
    margin-bottom: 12px;
    color: #1e3a8a;
    font-size: 30px;
}

p {
    color: #64748b;
    line-height: 1.6;
}

.botao-principal {
    display: block;
    margin-top: 28px;
    padding: 15px 20px;
    border-radius: 12px;
    background: #2563eb;
    color: #ffffff;
    font-weight: bold;
    text-decoration: none;
}

.botao-principal:hover {
    background: #1d4ed8;
}

.escondido {
    display: none;
}

.carregando {
    width: 42px;
    height: 42px;
    margin: 28px auto 0;
    border: 4px solid #dbeafe;
    border-top-color: #2563eb;
    border-radius: 50%;
    animation: girar 0.8s linear infinite;
}

@keyframes girar {
    to {
        transform: rotate(360deg);
    }
}