.jc-header { margin-bottom: 24px; }
.jc-title { font-size: 28px; font-weight: 700; color: #111827; margin: 0 0 8px; }
.jc-desc { font-size: 15px; color: #6b7280; margin: 0; }

.jc-input { padding: 24px; }
.jc-tabs { display: flex; gap: 8px; margin-bottom: 16px; border-bottom: 1px solid #e5e7eb; padding-bottom: 12px; }
.jc-tab { padding: 8px 16px; border: none; background: transparent; font-size: 14px; color: #6b7280; cursor: pointer; border-radius: 6px; }
.jc-tab:hover { color: #374151; }
.jc-tab.active { background: #eff6ff; color: #3b82f6; font-weight: 500; }

.jc-panel { display: none; }
.jc-panel.active { display: block; }

#jsonInput { width: 100%; min-height: 200px; padding: 16px; border: 2px solid #e5e7eb; border-radius: 10px; font-family: monospace; font-size: 14px; line-height: 1.6; resize: vertical; }
#jsonInput:focus { outline: none; border-color: #3b82f6; }

.jc-dropzone { border: 2px dashed #d1d5db; border-radius: 10px; padding: 48px 24px; text-align: center; cursor: pointer; }
.jc-dropzone:hover { border-color: #3b82f6; background: #eff6ff; }
.jc-dropzone p { margin: 0; color: #374151; }
.jc-subhint { font-size: 13px; color: #9ca3af; margin-top: 8px !important; }

.jc-options { padding: 24px; }
.jc-options h3 { font-size: 16px; font-weight: 600; margin: 0 0 16px; }
.jc-options-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; margin-bottom: 20px; }
.jc-option { display: flex; flex-direction: column; gap: 6px; }
.jc-option label { font-size: 13px; font-weight: 500; color: #374151; }
.jc-option select { padding: 10px 12px; border: 2px solid #e5e7eb; border-radius: 8px; font-size: 14px; }
.jc-option select:focus { outline: none; border-color: #3b82f6; }
.jc-convert-btn { width: 100%; padding: 14px; background: #3b82f6; color: white; border: none; border-radius: 10px; font-size: 15px; font-weight: 600; cursor: pointer; }
.jc-convert-btn:hover { background: #2563eb; }
.jc-convert-btn:disabled { background: #9ca3af; cursor: not-allowed; }

.jc-preview { padding: 24px; }
.jc-preview-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.jc-preview-header h3 { font-size: 16px; font-weight: 600; margin: 0; }
.jc-preview-header span { font-size: 13px; color: #6b7280; }
.jc-table-wrap { max-height: 300px; overflow: auto; border: 1px solid #e5e7eb; border-radius: 8px; margin-bottom: 16px; }
.jc-table-wrap table { width: 100%; border-collapse: collapse; font-size: 13px; }
.jc-table-wrap th { background: #f9fafb; padding: 12px; text-align: left; font-weight: 600; color: #374151; border-bottom: 1px solid #e5e7eb; white-space: nowrap; }
.jc-table-wrap td { padding: 10px 12px; border-bottom: 1px solid #f3f4f6; color: #4b5563; }
.jc-table-wrap tr:hover td { background: #f9fafb; }

.jc-actions { display: flex; gap: 12px; }
.jc-download-btn, .jc-copy-btn { flex: 1; padding: 12px; border-radius: 8px; font-size: 14px; font-weight: 500; cursor: pointer; }
.jc-download-btn { background: #10b981; color: white; border: none; }
.jc-download-btn:hover { background: #059669; }
.jc-copy-btn { background: white; border: 1px solid #e5e7eb; }
.jc-copy-btn:hover { background: #f3f4f6; }
.jc-copy-btn.copied { background: #ecfdf5; border-color: #10b981; color: #10b981; }

.jc-guide { padding: 20px; }
.jc-guide h3 { font-size: 16px; font-weight: 600; margin: 0 0 16px; }
.jc-guide-content { font-size: 14px; line-height: 1.8; color: #374151; }
.jc-guide-content h4 { font-size: 14px; font-weight: 600; margin: 16px 0 8px; }
.jc-guide-content ul { padding-left: 20px; }
.jc-guide-content li { margin: 4px 0; }

@media (max-width: 640px) {
    .jc-title { font-size: 22px; }
    .jc-options-grid { grid-template-columns: 1fr; }
}

@media (prefers-color-scheme: dark) {
    #jsonInput { background: #1f2937; border-color: #374151; color: #f9fafb; }
    .jc-option select { background: #1f2937; border-color: #374151; color: #f9fafb; }
    .jc-table-wrap th { background: #1f2937; }
    .jc-table-wrap td { border-color: #374151; }
}