.cu-dropzone {
    border: 2px dashed #b0bec5;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.55);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    padding: 48px 30px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
    min-height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}
.cu-dropzone:hover {
    border-color: #337ab7;
    background: rgba(227, 242, 253, 0.70);
    box-shadow: 0 4px 18px rgba(51,122,183,0.13);
}
.cu-dropzone.cu-drag-over {
    border-color: #1a6aad;
    background: rgba(200, 230, 255, 0.80);
    box-shadow: 0 6px 24px rgba(51,122,183,0.22);
    transform: scale(1.01);
}
.cu-drop-icon {
    font-size: 48px;
    line-height: 1;
    margin-bottom: 14px;
    display: block;
    opacity: 0.55;
    user-select: none;
}
.cu-drop-title {
    font-size: 18px;
    font-weight: 600;
    color: #37474f;
    margin: 0 0 6px 0;
}
.cu-drop-sub {
    font-size: 13px;
    color: #78909c;
    margin: 0 0 16px 0;
}
.cu-browse-btn {
    display: inline-block;
    padding: 7px 22px;
    background: #337ab7;
    color: #fff;
    border-radius: 5px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: background 0.15s;
    text-decoration: none;
    user-select: none;
}
.cu-browse-btn:hover {
    background: #2265a3;
}
.cu-file-input {
    display: none;
}
.cu-file-list {
    margin-top: 10px;
}
.cu-file-row {
    display: flex;
    align-items: center;
    padding: 6px 4px;
    border-bottom: 1px solid #eee;
    font-size: 13px;
    flex-wrap: wrap;
    gap: 6px;
}
.cu-file-name {
    flex: 2 1 200px;
    word-break: break-all;
    font-weight: 500;
}
.cu-size {
    flex: 0 0 70px;
    text-align: right;
    color: #888;
    font-size: 12px;
}
.cu-progress-wrap {
    flex: 3 1 150px;
    background: #e9e9e9;
    border-radius: 3px;
    height: 18px;
    overflow: hidden;
}
.cu-progress-bar {
    height: 100%;
    width: 0%;
    background: #5cb85c;
    border-radius: 3px;
    color: #fff;
    font-size: 11px;
    text-align: center;
    line-height: 18px;
    transition: width 0.3s;
    white-space: nowrap;
}
.cu-status {
    flex: 1 1 80px;
    font-size: 12px;
    color: #555;
}
.cu-status.cu-done {
    color: #3c763d;
    font-weight: 600;
}
.cu-status.cu-error {
    color: #a94442;
    font-weight: 600;
}
.cu-status.cu-resume {
    color: #8a6d3b;
}