.form-grid {
    display: grid;
    gap: 12px;
    max-width: 500px;
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-weight: bold;
    margin-bottom: 2px;
}

.form-group input[type="file"] {
    display: none;
}

.drop-zone {
    border: 2px dashed var(--control-outline);
    border-radius: 8px;
    padding: 30px 20px;
    text-align: center;
    background: var(--control-bg);
    cursor: pointer;
    transition: border-color 0.3s, background 0.3s;
    position: relative;
}

.drop-zone.dragover {
    border-color: var(--text-accent);
    background: rgba(94, 114, 190, 0.1);
}

.drop-zone-content {
    pointer-events: none;
}

.drop-icon {
    font-size: 40px;
    display: block;
    margin-bottom: 8px;
}

.drop-text {
    margin: 0;
    font-size: 16px;
    color: var(--text-primary);
}

.drop-hint {
    margin: 4px 0 0;
    font-size: 13px;
    color: var(--text-secondary);
}

.file-name {
    margin-top: 8px;
    padding: 4px 8px;
    background: var(--bg);
    border: 1px solid var(--control-outline);
    border-radius: 4px;
    display: inline-block;
    font-size: 14px;
    color: var(--text-primary);
}

.file-name.hidden {
    display: none;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 6px 8px;
    border: 1px solid var(--control-outline);
    border-radius: 6px;
    background: var(--control-bg);
    color: var(--text-primary);
    box-sizing: border-box;
}

.form-group input:focus,
.form-group select:focus {
    outline: 1px solid var(--text-accent);
    border-color: var(--text-accent);
}

.form-group input[type="checkbox"],
.form-group input[type="radio"] {
    width: auto;
    margin-right: 6px;
}

.help-text {
    font-size: 0.85em;
    color: var(--text-secondary);
    margin-top: 2px;
}

.errorlist {
    color: #d32f2f;
    font-size: 0.9em;
    margin: 2px 0;
    padding: 0;
    list-style: none;
}

.hidden {
    display: none !important;
}

#result-area {
    margin-top: 24px;
}

#tree-preview {
    background: var(--control-bg);
    padding: 12px;
    border-radius: 8px;
    overflow: auto;
    max-height: 400px;
    border: 1px solid var(--control-outline);
    font-size: 13px;
}

#download-area {
    margin-top: 12px;
}

#submit-btn {
    margin-top: 4px;
}