body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #0e0f14;
    font-family: "Inter", Arial, sans-serif;
    color: #f4f4f6;
    position: relative;
    overflow: hidden;
}
.background-svg {
    position: fixed;
    top: 50%;
    left: 47%;
    z-index: 0;
    pointer-events: none;
    width: 60vw;
    height: 60vw;
    transform: translate(-50%, -50%);
    opacity: 0.5;
    background: no-repeat center center;
    background-size: contain;
    background-image: url("favicon.svg");
    filter: brightness(0);
}

.container {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    z-index: 1;
    justify-content: center;
}

.btn {
    background: rgba(20, 21, 28, 0.5);
    border: 1px solid #202127;
    border-radius: 10px;
    color: #c5c5c6;
    font-weight: 300;
    font-size: 1rem;
    cursor: pointer;
    text-decoration: none;
    user-select: none;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 4px 24px 0 rgba(30, 34, 43, 0.11);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 140px;
    text-align: center;
    transition: background 0.3s, border-color 0.3s, color 0.3s, box-shadow 0.3s;
    padding: 18px 36px;
}

.btn:hover {
    background: rgba(20, 21, 28, 0.75);
    border-color: #e43e3e;
    color: #e43e3e;
    box-shadow: 0px 4px 20px 6px rgba(228, 62, 62, 0.2);
}

/* Мобильные устройства */
@media (max-width: 640px) {
    .background-svg {
        width: 150vw;
        height: 150vw;
    }
}