:root {
    --primary-flat: #2c3e50;
    --accent-flat: #3498db;
}

.btn-primary {
    background-color: var(--primary-flat) !important;
    border-color: var(--primary-flat) !important;
    border-radius: 4px;
    box-shadow: none !important;
    transition: background 0.2s ease;
}

.bg-primary {
    background-color: var(--primary-flat) !important;
}

.btn-outline-primary {
    color: var(--primary-flat);
    border-color: var(--primary-flat);
    border-radius: 4px;
    box-shadow: none !important;
    transition: background 0.2s ease;
}

.btn-outline-primary:hover {
    background-color: var(--primary-flat);
    color: #fff;
    border-color: var(--primary-flat);
}

.btn-primary:hover, .btn-primary:active {
    background-color: #1a252f !important;
}

.btn-outline-secondary {
    color: var(--primary-flat);
    border-color: var(--primary-flat);
}

.btn-outline-secondary:hover {
    background-color: var(--primary-flat);
    color: #fff;
}

.upload-box {
    border: 2px dashed #bdc3c7 !important;
    border-radius: 4px;
    color: var(--primary-flat);
    background-color: #ffffff;
}

.text-primary {
    color: var(--accent-flat) !important;
}

.card {
    border-radius: 4px;
    border: 1px solid #ecf0f1;
}

.upload-box {
    border: 2px dashed #0d6efd;
    border-radius: 10px;
    padding: 40px;
    text-align: center;
    background: #f8f9fa;
    cursor: pointer;
    transition: 0.3s;
}
.upload-box:hover { background: #e9ecef; }
#file_list { font-size: 0.9rem; color: #6c757d; }