body {
    margin: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #eee;
    font-family: Arial, sans-serif;
}

#bg-animado {
    position: fixed;
    inset: 0;
    z-index: -1;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 0.8s ease;
    animation: mover-bg 15s linear infinite;
    filter: brightness(0.4);
}

/* animação horizontal infinita */
@keyframes mover-bg {
    0% { background-position: 0% center; }
    100% { background-position: 200% center; }
}

.container {
    display: flex;
    gap: 40px;
}

.btn {
    position: relative;
    width: 45vw;
    height: 95vh;
    border-radius: 20px;
    overflow: hidden;
    text-decoration: none;
    display: flex;
    justify-content: center;
    align-items: flex-end;
    transition: 0.3s;
    cursor: pointer;
}

.btn img {
    position: absolute;
    width: 100%;
    height: 100%;
    object-fit: cover;

    /* Preto e branco por padrão */
    filter: grayscale(100%);
    transition: 0.4s ease-in-out;
}

.btn:hover img {
    /* Volta a cor no hover */
    filter: grayscale(0%);
}

.btn span {
    position: relative;
    z-index: 2;
    font-size: 22px;
    font-weight: bold;
    padding: 12px 20px;
    border-radius: 10px;
    margin-bottom: 15px;
    transition: 0.3s;
}

/* ================================
   BOTÃO 1 — Roxo / Laranja / Lilás
================================ */

.btn1 {
    border: 5px solid #603E94;
    box-shadow: 0 0 15px #BC9BEFaa;
}

.btn1 span {
    background: linear-gradient(45deg, #603E94, #F58634, #BC9BEF);
    color: white;
}

/* Hover destaque */
.btn1:hover {
    box-shadow: 0 0 100vh #BC9BEF;
}

/* ================================
   BOTÃO 2 — Marsalla / Laranja / Creme
================================ */

.btn2 {
    border: 5px solid #590c1b;
    box-shadow: 0 0 15px #c8502faa;
}

.btn2 span {
    background: linear-gradient(45deg, #590c1b, #c8502f, #f7f1ec);
    color: #fff;
}

/* Hover destaque */
.btn2:hover {
    box-shadow: 0 0 100vh #c8502f;
}