:root {
    --hub-bg: #fff;
    --hub-border: var(--bs-border-color,#e5e7eb);
    --hub-shadow: 0 10px 28px rgba(0,0,0,.06);
    --hub-radius: 16px;
    --muted: #6b7280;
}

.page-card {
    background: var(--hub-bg);
    border: 1px solid var(--hub-border);
    border-radius: var(--hub-radius);
    box-shadow: var(--hub-shadow)
}

    .page-card .card-body {
        padding: 1.25rem
    }

.hub-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: .5rem
}

.hub-title {
    margin: 0;
    font-weight: 800;
    letter-spacing: .2px
}

.hub-sub {
    margin: 0;
    color: var(--muted)
}

.section {
    border: 1px solid var(--hub-border);
    border-radius: 14px;
    padding: 16px
}

.section-title {
    font-weight: 700;
    margin: 0 0 .25rem
}

.help-txt {
    color: var(--muted);
    font-size: .95rem
}

/* Upload preview boxes (image/pdf) */
.upload-group {
    display: grid;
    grid-template-columns: repeat(auto-fit,minmax(260px,1fr));
    gap: 14px
}

.upload-card {
    border: 1px dashed #cfd6e4;
    border-radius: .9rem;
    padding: 14px;
    background: #fafbff
}

.upload-box {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 160px;
    border-radius: .65rem;
    background: #fff;
    cursor: pointer;
    text-align: center
}

    .upload-box:hover {
        background: #f6f8ff
    }

    .upload-box img {
        max-height: 140px;
        max-width: 100%;
        border-radius: .5rem
    }

.upload-hint {
    color: #6b7280;
    font-size: .9rem
}

.pdf-preview {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .35rem
}

.upload-actions {
    display: flex;
    gap: .5rem;
    flex-wrap: wrap;
    margin-top: .6rem
}

.btn-ghost {
    background: transparent;
    border: 1px solid var(--hub-border)
}

    .btn-ghost:hover {
        background: #f8f9fa
    }

/* Loader / states */
.centered {
    display: flex;
    align-items: center;
    justify-content: center
}

.loader-dots {
    display: flex;
    gap: 6px;
    padding: 14px
}

    .loader-dots span {
        width: 9px;
        height: 9px;
        border-radius: 50%;
        background: #0d6efd;
        animation: b 1s infinite alternate
    }

        .loader-dots span:nth-child(2) {
            animation-delay: .15s
        }

        .loader-dots span:nth-child(3) {
            animation-delay: .3s
        }

@@keyframes b {
    to {
        opacity: .3;
        transform: translateY(-6px)
    }
}