/* ==========================================================================
   1. CONFIGURACIÓN BASE Y FONDO CYBERPUNK OSCURO
   ========================================================================== */
body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background-color: #000000;
    background-image: 
        radial-gradient(at 10% 12%, rgba(255, 255, 255, 0.03) 0px, transparent 50%),
        radial-gradient(at 95% 85%, rgba(255, 255, 255, 0.02) 0px, transparent 50%);
    min-height: 100vh;
    margin: 0;
    padding: 50px 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    position: relative;
}

/* Orbes de luz blanca fría de fondo para generar el contraste del vidrio */
.bg-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    z-index: 0;
    opacity: 0.15;
    pointer-events: none;
}
.orb-1 { width: 450px; height: 450px; background: #ffffff; top: -5%; left: 15%; }
.orb-2 { width: 550px; height: 550px; background: #ffffff; bottom: -5%; right: 10%; }
.orb-3 { width: 300px; height: 300px; background: #cccccc; top: 45%; left: 40%; }

.main-container {
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    gap: 40px;
    z-index: 1;
}

/* ==========================================================================
   2. EFECTO ULTRA LIQUID GLASS (VIDRIO GRUESO)
   ========================================================================== */
.card-glass {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border-radius: 20px;
    padding: 35px;
    /* Doble sombra: una oscura profunda y un resplandor de neón blanco exterior sutil */
    box-shadow: 
        0 20px 50px rgba(0, 0, 0, 0.8), 
        0 0 15px rgba(255, 255, 255, 0.03),
        inset 0 2px 4px rgba(255, 255, 255, 0.25), /* Reflejo brillante en el borde superior */
        inset 0 -1px 2px rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card-glass:hover {
    transform: translateY(-3px);
    box-shadow: 
        0 25px 60px rgba(0, 0, 0, 0.9), 
        0 0 25px rgba(255, 255, 255, 0.08), /* Incremento del neón blanco al pasar el cursor */
        inset 0 3px 6px rgba(255, 255, 255, 0.4),
        inset 0 -1px 3px rgba(255, 255, 255, 0.1);
}

/* Título estilo Minimalista con Brillo */
.section-title {
    font-size: 19px;
    font-weight: 700;
    color: #ffffff;
    margin-top: 0;
    margin-bottom: 25px;
    letter-spacing: 1px;
    text-transform: uppercase;
    border-left: 3px solid #ffffff;
    padding-left: 12px;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.4);
}

/* ==========================================================================
   3. COMPONENTES DE ENTRADA Y FORMULARIOS
   ========================================================================== */
.input-row {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 20px;
    margin-bottom: 30px;
}

.input-row label {
    font-size: 13px;
    color: #a3a3a3;
    font-weight: 600;
    line-height: 1.4;
    width: 220px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-row input {
    flex: 1;
    max-width: 340px;
    padding: 12px 16px;
    font-size: 16px;
    background: rgba(0, 0, 0, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    color: #ffffff;
    outline: none;
    transition: all 0.2s ease;
}

.input-row input:focus {
    border-color: #ffffff;
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.2); /* Brillo neón blanco al enfocar */
    background: #000000;
}

/* Botones Acromáticos de Alto Contraste */
.input-row button {
    background: linear-gradient(135deg, #262626 0%, #171717 100%);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 10px 22px;
    font-size: 12px;
    font-weight: 700;
    border-radius: 8px;
    cursor: pointer;
    line-height: 1.3;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    transition: all 0.2s ease;
}

.input-row button:hover {
    background: linear-gradient(135deg, #ffffff 0%, #e5e5e5 100%);
    color: #000000;
    border-color: #ffffff;
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.4);
}

/* ==========================================================================
   4. TABLAS DE PASOS (MOCKUP ORIGINAL PRESERVADO)
   ========================================================================== */
.table-wrapper {
    overflow-x: auto;
    margin-bottom: 25px;
}

.luhn-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0 10px;
}

.label-cell {
    width: 230px;
    font-size: 13px;
    color: #737373;
    font-weight: 600;
    padding-right: 15px;
}

.data-cell {
    border: 1px solid rgba(255, 255, 255, 0.15);
    width: 40px;
    height: 40px;
    text-align: center;
    vertical-align: middle;
    font-size: 14px;
    font-weight: 700;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.02);
}

/* Clases de colores de la práctica adaptados a la estética monocromática */
.bg-blue {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.25);
    color: #ffffff;
}

.bg-yellow {
    background-color: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.45);
    color: #ffffff;
    text-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
}

.bg-green {
    background-color: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.35);
    color: #ffffff;
}

.text-bold { font-weight: 800; }

/* ==========================================================================
   5. SECCIÓN DE RESULTADO (Caja Neón Blanca Envolvente)
   ========================================================================== */
.result-container {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 25px;
    margin-top: 25px;
    padding-left: 230px;
}

.result-label {
    font-size: 18px;
    font-weight: 700;
    color: #ffffff;
    line-height: 1.2;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.result-box {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.4);
    color: #ffffff;
    font-size: 38px;
    font-weight: 700;
    width: 110px;
    height: 75px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    box-shadow: 
        0 0 20px rgba(255, 255, 255, 0.15),
        inset 0 1px 2px rgba(255, 255, 255, 0.3);
    text-shadow: 0 0 12px rgba(255, 255, 255, 0.6);
}

/* ==========================================================================
   6. CONTENEDORES Y BLOQUES DEL VALIDADOR MEJORADO
   ========================================================================== */
.validation-badge {
    margin-left: 240px;
    max-width: 340px;
    width: 100%;
    padding: 16px;
    font-size: 13px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
}

.badge-title {
    font-size: 14px;
    font-weight: 800;
    letter-spacing: 1px;
    margin-bottom: 12px;
    text-shadow: 0 0 8px rgba(255, 255, 255, 0.2);
}

.comparison-box {
    text-align: left;
    background: rgba(0, 0, 0, 0.5);
    padding: 14px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.comparison-box p {
    margin: 0 0 5px 0;
    font-size: 12px;
    color: #a3a3a3;
    text-transform: none;
}

.comp-row {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    font-family: 'Courier New', Courier, monospace; /* Fuente de consola */
    font-weight: bold;
}

.comp-label {
    color: #737373;
}

/* Resaltados de estados de validación */
.text-valid {
    color: #ffffff;
    text-shadow: 0 0 8px rgba(255, 255, 255, 0.6);
}

.text-invalid {
    color: #fca5a5;
    text-shadow: 0 0 8px rgba(239, 68, 68, 0.4);
}

.text-corrected {
    color: #ffffff;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.8);
    text-decoration: underline;
}

.digit-diff {
    margin-top: 5px;
    padding-top: 8px;
    border-top: 1px dashed rgba(255, 255, 255, 0.1);
    font-size: 11px;
    color: #a3a3a3;
    text-transform: none;
    line-height: 1.4;
}


.alert-success {
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid #ffffff;
    color: #ffffff;
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.1);
}

.alert-error {
    background-color: rgba(239, 68, 68, 0.05);
    border: 1px solid rgba(239, 68, 68, 0.4);
    color: #fca5a5;
}

.hidden { display: none !important; }


@media (max-width: 768px) {
    .input-row { flex-direction: column; align-items: flex-start; }
    .input-row label { width: 100%; text-align: left; }
    .result-container, .validation-badge { padding-left: 0; margin-left: 0; justify-content: center; }
}