* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0052CC;
    --primary-hover: #0065FF;
    --secondary-color: #42526E;
    --success-color: #00875A;
    --danger-color: #DE350B;
    --background-color: #F4F5F7;
    --surface-color: #FFFFFF;
    --border-color: #DFE1E6;
    --text-color: #172B4D;
    --text-secondary: #6B778C;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.12);
    --radius: 4px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: var(--surface-color);
    padding: 20px 0;
    box-shadow: var(--shadow-sm);
    margin-bottom: 30px;
    position: relative;
}

h1 {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 5px;
}

.subtitle {
    font-size: 16px;
    color: var(--text-secondary);
}

.language-selector {
    position: absolute;
    top: 20px;
    right: 20px;
}

.language-selector select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background-color: var(--surface-color);
    font-size: 14px;
    cursor: pointer;
}

main {
    min-height: calc(100vh - 200px);
}

.upload-section {
    background-color: var(--surface-color);
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 30px;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius);
    padding: 60px 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary-color);
    background-color: rgba(0, 82, 204, 0.05);
}

.upload-icon {
    width: 64px;
    height: 64px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.upload-area p {
    font-size: 16px;
    color: var(--text-secondary);
}

.sample-data {
    margin-top: 20px;
    text-align: center;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: var(--surface-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--background-color);
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-success:hover {
    background-color: #00A368;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background-color: #FF5630;
}

.editor-section {
    background-color: var(--surface-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.toolbar {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    align-items: center;
}

.toolbar-group {
    display: flex;
    gap: 10px;
    align-items: center;
}

.search-input {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 14px;
    width: 200px;
}

.table-container {
    overflow: auto;
    max-height: 600px;
}

.csv-table {
    width: 100%;
    border-collapse: collapse;
}

.csv-table th,
.csv-table td {
    padding: 8px;
    border: 1px solid var(--border-color);
    text-align: left;
}

.csv-table th {
    background-color: var(--background-color);
    font-weight: 600;
    position: sticky;
    top: 0;
    z-index: 10;
}

.csv-table tr:hover {
    background-color: rgba(0, 82, 204, 0.05);
}

.csv-table input[type="text"] {
    width: 100%;
    border: none;
    padding: 4px;
    font-size: 14px;
    background: transparent;
}

.csv-table input[type="text"]:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: -2px;
    background-color: var(--surface-color);
}

.header-input {
    font-weight: 600;
}

.select-all {
    width: 40px;
    text-align: center;
}

.csv-table input[type="checkbox"] {
    cursor: pointer;
}

.status-bar {
    padding: 15px 20px;
    background-color: var(--background-color);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 30px;
    font-size: 14px;
    color: var(--text-secondary);
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background-color: var(--surface-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow: auto;
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 20px;
    font-weight: 600;
}

.close-btn {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-secondary);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
}

.close-btn:hover {
    background-color: var(--background-color);
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.filter-condition {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
    align-items: center;
}

.filter-condition select,
.filter-condition input {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 14px;
}

.filter-column {
    flex: 1;
}

.filter-operator {
    flex: 1;
}

.filter-value {
    flex: 2;
}

.remove-condition {
    background-color: var(--danger-color);
    color: white;
    border: none;
    border-radius: var(--radius);
    width: 32px;
    height: 32px;
    cursor: pointer;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.remove-condition:hover {
    background-color: #FF5630;
}

footer {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 40px;
}

@media (max-width: 768px) {
    .toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .toolbar-group {
        width: 100%;
        flex-wrap: wrap;
    }
    
    .search-input {
        width: 100%;
    }
    
    .language-selector {
        position: static;
        margin-top: 10px;
    }
    
    .upload-area {
        padding: 40px 20px;
    }
    
    .filter-condition {
        flex-wrap: wrap;
    }
    
    .filter-condition select,
    .filter-condition input {
        flex: 1 1 100%;
    }
}