/* ====== BACK TO TOP ====== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 999;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
    font-size: 1.4em;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    transition: all 0.25s ease;
    text-decoration: none;
    opacity: 0.8;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
    opacity: 1;
}

/* ====== SECTION SPACING ====== */
.flow-node {
    scroll-margin-top: 80px;
}

.connection {
    padding: 40px 0;
}