:root {
    --primary-blue: #0b2545; /* Color azul oscuro solicitado */
    --accent-blue: #134074;
    --light-bg: #f0f4f8;
    --white: #ffffff;
    --text-dark: #1e293b;
    --text-muted: #64748b;
    --success-color: #15803d;
    --success-bg: #dcfce7;
    --error-color: #b91c1c;
    --error-bg: #fee2e2;
}

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

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--light-bg);
    color: var(--text-dark);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

/* Tarjeta contenedora centrada */
.verification-card {
    background-color: var(--white);
    max-width: 480px;
    width: 100%;
    padding: 2.5rem 2rem;
    border-radius: 16px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    text-align: center;
}

/* Imagen en tamaño mediano */
.logo {
    width: 160px;
    height: auto;
    margin-bottom: 1rem;
}

/* CESTELCO en azul oscuro y tamaño mediano */
.brand-title {
    color: var(--primary-blue);
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    margin-bottom: 2rem;
}

.section-title {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Estilo de la casilla de entrada */
.input-group {
    margin-bottom: 1.2rem;
}

input[type="text"] {
    width: 100%;
    padding: 1rem;
    border: 2px solid #cbd5e1;
    border-radius: 8px;
    font-size: 1rem;
    text-align: center;
    text-transform: uppercase;
    outline: none;
    transition: border-color 0.2s ease;
}

input[type="text"]:focus {
    border-color: var(--accent-blue);
}

/* Botón de verificación */
.btn-submit {
    width: 100%;
    padding: 1rem;
    background-color: var(--primary-blue);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.btn-submit:hover {
    background-color: var(--accent-blue);
}

/* Estilos dinámicos para las respuestas */
.result-container {
    margin-top: 1.5rem;
    padding: 1.5rem;
    border-radius: 8px;
    text-align: left;
    display: block;
}

.result-container.hidden {
    display: none;
}

.result-container.success {
    background-color: var(--success-bg);
    border: 1px solid #bbf7d0;
    color: #166534;
}

.result-container.error {
    background-color: var(--error-bg);
    border: 1px solid #fecaca;
    color: #991b1b;
}

.result-header {
    font-weight: 700;
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
    text-align: center;
}

.result-body p {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.result-body p:last-child {
    margin-bottom: 0;
}

.badge-active {
    background-color: var(--success-color);
    color: white;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: bold;
}

.error-msg {
    text-align: center;
    font-weight: 600;
}

footer {
    margin-top: 2.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Adaptabilidad a dispositivos celulares */
@media (max-width: 480px) {
    body {
        background-color: var(--white);
    }
    .verification-card {
        padding: 1.5rem 1rem;
        box-shadow: none;
        background: transparent;
    }
}