/* ==========================================
   CONFIGURACIÓN BASE Y FONDO (Paleta Sobria)
========================================== */
body {
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
    background: #5b6977 url('../img/background.jpg') no-repeat center center fixed;
    background-size: cover;
    /* Color de texto principal: Carbón profundo para contraste */
    color: #2c3338; 
    min-height: 100vh;
}

/* ==========================================
   PANELES GLASSMORPHISM (Crema Cálido Translúcido)
========================================== */
.glass-panel, .glass-navbar, .glass-footer {
    /* Fondo que rescata el tono crema de tu imagen */
    background: rgba(235, 230, 220, 0.35);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 10px 40px rgba(44, 51, 56, 0.2);
}

.glass-navbar .navbar-brand,
.glass-navbar .nav-link,
.glass-footer p,
.glass-footer small {
    color: #2c3338 !important; 
}

.glass-panel {
    border-radius: 24px;
}

/* ==========================================
   ESTRUCTURA DE TARJETA Y GIRO 3D
========================================== */
.credit-card-wrapper {
    perspective: 1000px;
    width: 350px;
    height: 220px;
    z-index: 10;
}

.credit-card {
    width: 100%;
    height: 100%;
    position: relative;
    animation: float 6s ease-in-out infinite; 
}

.card-inner {
    width: 100%;
    height: 100%;
    position: absolute;
    transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transform-style: preserve-3d;
}

.credit-card.is-flipped .card-inner {
    transform: rotateY(180deg);
}

.card-front, .card-back {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: 16px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* ==========================================
   ESTILOS DE LA TARJETA (Gris Pizarra/Carbón Oscuro)
========================================== */
.glass-card {
    /* Gradiente oscuro que rescata los tonos profundos del fondo */
    background: linear-gradient(135deg, rgba(72, 80, 88, 0.95) 0%, rgba(44, 51, 56, 0.98) 100%);
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 15px 35px rgba(0,0,0,0.3);
}

/* Textos de la tarjeta en tono Crema suave en lugar de blanco puro */
.visa-logo, .card-number-display, .card-holder p, .card-expires p {
    color: #f0ead6 !important;
}

.card-holder small, .card-expires small {
    color: rgba(240, 234, 214, 0.6) !important;
}

.chip {
    width: 45px;
    height: 32px;
    /* Chip con un dorado más apagado/bronce para mantener la sobriedad */
    background: linear-gradient(135deg, #d4af37, #aa8529);
    border-radius: 6px;
}

.tracking-widest {
    letter-spacing: 0.15em;
}

/* Cara Trasera */
.card-back {
    transform: rotateY(180deg);
    padding: 0; 
}

.magnetic-strip {
    width: 100%;
    height: 45px;
    background: #1a1e22; 
}

.cvv-band {
    background: #f0ead6;
    color: #2c3338;
}

/* ==========================================
   FORMULARIO (Inputs minimalistas)
========================================== */
.glass-input {
    background: rgba(255, 255, 255, 0.5) !important;
    border: 1px solid rgba(44, 51, 56, 0.2) !important;
    color: #2c3338 !important;
    transition: all 0.3s ease;
}

.glass-input::placeholder {
    color: rgba(44, 51, 56, 0.5);
}

/* Foco en los inputs usando el tono Pizarra del fondo */
.glass-input:focus {
    background: rgba(255, 255, 255, 0.8) !important;
    border-color: #5b6977 !important;
    box-shadow: 0 0 12px rgba(91, 105, 119, 0.3) !important;
    outline: none;
}

option {
    background-color: #fdfaf5; 
    color: #2c3338;
}

/* ==========================================
   BOTÓN (Gradiente Azul Pizarra a Marrón Topo)
========================================== */
.glass-btn {
    /* Mezcla de los dos tonos dominantes del fondo */
    background: linear-gradient(135deg, #5b6977, #665b56);
    color: #f0ead6 !important;
    font-weight: 600;
    border: none;
    transition: 0.3s ease;
}

.glass-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(91, 105, 119, 0.4); 
}

/* ==========================================
   ANIMACIONES Y EXTRAS
========================================== */
@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

@media (max-width: 768px) {
    .credit-card-wrapper { width: 100%; height: 200px; }
    .card-number-display { font-size: 1.2rem; }
}

/* Clases Dinámicas JS (Adaptadas a la paleta sobria) */
.card-front {
    transition: background 0.5s ease, border-color 0.5s ease;
}

/* Mastercard: Borgoña muy oscuro/apagado */
.brand-mastercard {
    background: linear-gradient(135deg, rgba(65, 40, 40, 0.95) 0%, rgba(45, 30, 30, 0.98) 100%) !important;
    border-color: rgba(130, 90, 90, 0.3) !important;
}

/* Amex: Azul marino corporativo profundo */
.brand-amex {
    background: linear-gradient(135deg, rgba(35, 50, 65, 0.95) 0%, rgba(25, 35, 45, 0.98) 100%) !important;
    border-color: rgba(91, 105, 119, 0.3) !important;
}