.hero-banner {
    background: linear-gradient(135deg, #0d6efd 0%, #0a58ca 100%) !important;
        min-height: 600px;
    position: relative;
}

.flying-envelopes {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 1;
}

.container {
    position: relative;
    z-index: 2;
}

.envelope {
    position: absolute;
    width: 60px;
    height: 40px;
    background: rgba(255, 255, 255, 0.15);
    position: relative;
    animation: flyingEnvelope 15s linear infinite;
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.2);
    transform-style: preserve-3d;
    perspective: 1000px;
    border-radius: 2px;
}

/* Cuerpo principal del sobre */
.envelope::before {
    content: '';
    position: absolute;
    width: calc(100% - 4px);
    height: calc(100% - 4px);
    top: 2px;
    left: 2px;
    background: linear-gradient(45deg, rgba(240, 240, 240, 0.4), rgba(255, 255, 255, 0.15));
    clip-path: polygon(0% 0%, 50% 50%, 100% 0%, 100% 75%, 50% 100%, 0% 75%);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transform: translateZ(2px);
}

/* Solapa superior */
.envelope::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.5), rgba(240, 240, 240, 0.15));
    clip-path: polygon(0 0, 50% 100%, 100% 0);
    transform-origin: top;
    animation: flapMove 3s ease-in-out infinite;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);
    transform-style: preserve-3d;
}

/* Líneas decorativas del sobre */
.envelope::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        linear-gradient(45deg, 
            transparent 48%, 
            rgba(255, 255, 255, 0.1) 50%,
            transparent 52%
        ),
        linear-gradient(-45deg, 
            transparent 48%, 
            rgba(255, 255, 255, 0.1) 50%,
            transparent 52%
        );
    background-size: 10px 10px;
    opacity: 0.3;
}

/* Sello postal actualizado */
.envelope .stamp {
    content: '';
    position: absolute;
    bottom: 5px;
    right: 5px;
    width: 20px;
    height: 20px;
    background: linear-gradient(135deg, rgba(183, 28, 28, 0.8), rgba(229, 57, 53, 0.2));
    border-radius: 50%;
    box-shadow: 
        0 2px 4px rgba(0, 0, 0, 0.2),
        inset 0 -2px 4px rgba(0, 0, 0, 0.1),
        inset 0 2px 4px rgba(255, 255, 255, 0.2);
    z-index: 2;
    transform: 
        translateZ(5px)
        rotate(-15deg)
        perspective(100px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transform-style: preserve-3d;
}

/* Modificar el check en el medio del sello */
.envelope .stamp::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    width: 8px;
    height: 5px;
    border-left: 1.5px solid rgba(255, 255, 255, 0.9);
    border-bottom: 1.5px solid rgba(255, 255, 255, 0.9);
    transform: 
        translate(-50%, -70%) 
        translateZ(2px) 
        rotate(-45deg);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* Borde interior del sello */
.envelope .stamp::before {
    content: '';
    position: absolute;
    inset: 2px;
    border-radius: 50%;
    border: 1.5px dotted rgba(255, 255, 255, 0.4);
    transform: translateZ(1px);
    box-shadow: 
        inset 0 1px 3px rgba(0, 0, 0, 0.1),
        0 1px 2px rgba(255, 255, 255, 0.2);
}

/* Agregar los bordes laterales del sobre */
.envelope-side-left,
.envelope-side-right {
    content: '';
    position: absolute;
    bottom: 0;
    width: 0;
    height: 0;
    border-style: solid;
}

.envelope:nth-child(1) { top: 20%; left: -60px; animation-delay: 0s; }
.envelope:nth-child(2) { top: 40%; left: -60px; animation-delay: 3s; }
.envelope:nth-child(3) { top: 60%; left: -60px; animation-delay: 6s; }
.envelope:nth-child(4) { top: 30%; left: -60px; animation-delay: 9s; }
.envelope:nth-child(5) { top: 70%; left: -60px; animation-delay: 12s; }

@keyframes flapMove {
    0%, 100% { 
        transform: rotateX(0deg) translateZ(2px);
        box-shadow: 0 -2px 5px rgba(0, 0, 0, 0.2);
    }
    50% { 
        transform: rotateX(40deg) translateZ(4px);
        box-shadow: 0 -8px 15px rgba(0, 0, 0, 0.2);
    }
}

@keyframes flyingEnvelope {
    0% {
        transform: translateX(-60px) rotate(0deg) translateY(0) translateZ(0);
        opacity: 0;
    }
    10% {
        opacity: 0.3;
        transform: translateX(calc(10vw)) rotate(5deg) translateY(-10px) translateZ(20px);
    }
    40% {
        opacity: 0.1;
        transform: translateX(calc(40vw)) rotate(160deg) translateY(10px) translateZ(-20px);
    }
    50% {
        opacity: 0.1;
        transform: translateX(calc(50vw)) rotate(180deg) translateY(10px) translateZ(-20px);
    }
    60% {
        opacity: 0.1;
        transform: translateX(calc(60vw)) rotate(200deg) translateY(10px) translateZ(-20px);
    }
    90% {
        opacity: 0.3;
        transform: translateX(calc(90vw)) rotate(355deg) translateY(-15px) translateZ(20px);
    }
    100% {
        transform: translateX(calc(100vw + 60px)) rotate(360deg) translateY(0) translateZ(0);
        opacity: 0;
    }
}