.dark {
    /* ============= PALETA DE CORES ============= */
    --gradient-start: #0f417a;
    --gradient-end: #071540;
    
    --color-white: #ffffff;
    --color-black: #000000;
    
    --color-bg-nav: #0f417acc;
    --color-bg-card: #081e62;
    --color-bg-footer: #081e62;
    
    --color-bg-button: #ffffff;
    --color-bg-button-hover: #e0e0e0;
    
    --color-shadow-1: rgba(3, 28, 120, 0.5);
    --color-shadow-2: rgba(9, 87, 165, 0.6);
    --color-shadow-3: #155cc7;
    /* =========================================== */

    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 35%);
    color: var(--color-white);
}

.dark .card img {
    filter: grayscale(20%);
}

.dark #logo {
    filter: brightness(0) invert(); 
}

.dark .linha {
    background-color: var(--color-white);
}

.dark nav {
    background-color: var(--color-bg-nav);
    backdrop-filter: blur(10px);
}

.dark nav a {
    text-decoration: none;
    color: var(--color-white);
    display: block;
    padding: 10px;
    font-weight: bold;
}

.dark nav a:hover {
    color: var(--color-black);
}

.dark .main {
    color: var(--color-white);
}

.dark .card {
    background-color: var(--color-bg-card);
    box-shadow: 35px 35px 68px 0px var(--color-shadow-1), 
                inset -8px -8px 16px 0px var(--color-shadow-2), 
                inset 0px 11px 28px 0px var(--color-shadow-3);
    color: var(--color-white);
}

.dark .card-content button {
    background-color: var(--color-bg-button);
    color: var(--color-black);
}

.dark .card-content button:hover {
    background-color: var(--color-bg-button-hover);
}

.dark .footer {
    background-color: var(--color-bg-footer);
    color: var(--color-white);
}

.dark .footer a {
    color: var(--color-white);
}