:root {
    --glass-bg: rgba(15, 23, 42, 0.6);
    --glass-border: rgba(255, 255, 255, 0.08);
}

body {
    background-color: #0f172a;
}

/* Efecto Cristal */
.glass-header, .glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

/* Tarjetas */
.file-card {
    background: rgba(30, 41, 59, 0.4);
    border: 1px solid var(--glass-border);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.file-card:hover {
    transform: translateY(-4px);
    border-color: rgba(6, 182, 212, 0.5); /* Cyan */
    box-shadow: 0 10px 30px -10px rgba(6, 182, 212, 0.2);
}

/* Animación de borde al hacer hover */
.file-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}
.file-card:hover::before { opacity: 1; }

/* Botones */
.btn-primary {
    background: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    color: white;
    font-weight: 500;
    transition: opacity 0.2s;
}
.btn-primary:hover { opacity: 0.9; }

.btn-secondary {
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.1);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    color: white;
    transition: background 0.2s;
}
.btn-secondary:hover { background: rgba(255,255,255,0.2); }

/* Scrollbar general */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: #0f172a; }
::-webkit-scrollbar-thumb { background: #334155; border-radius: 3px; }

/* Drag & Drop Visuals */
.drag-over {
    border: 2px dashed #06b6d4 !important;
    background: rgba(6, 182, 212, 0.1) !important;
    transform: scale(1.02);
}
.dragging {
    opacity: 0.4;
    border: 1px dashed #a855f7;
}

/* --- RESPONSIVE MOBILE --- */
@media (max-width: 768px) {
    /* En móvil, botones de acción siempre visibles */
    .group:hover .opacity-0,
    .opacity-0 {
        opacity: 1 !important;
    }

    /* Posición de botones en móvil para no tapar */
    .file-card .absolute {
        background: rgba(15, 23, 42, 0.95);
        border: 1px solid rgba(255, 255, 255, 0.15);
        padding: 4px;
        top: 6px;
        right: 6px;
        border-radius: 6px;
    }

    /* Ocultar barra scroll en breadcrumbs */
    .scrollbar-hide::-webkit-scrollbar { display: none; }
    .scrollbar-hide { -ms-overflow-style: none; scrollbar-width: none; }
}