.csv-viewer-tool {
    padding: 40px 20px;
    background: #f7f9fc;
}

.csv-viewer-tool .tool-container {
    max-width: 1100px;
    margin: 0 auto;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
    padding: 32px;
}

.csv-viewer-tool .tool-header {
    text-align: center;
    margin-bottom: 32px;
}

.csv-viewer-tool .tool-header h1 {
    font-size: 2rem;
    margin-bottom: 12px;
    color: #0f172a;
}

.csv-viewer-tool .tool-header p {
    color: #475569;
    font-size: 1rem;
}

.csv-controls {
    display: grid;
    gap: 20px;
    margin-bottom: 28px;
}

.upload-section,
.url-section,
.options-section {
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 20px;
}

.control-title {
    font-weight: 600;
    color: #0f172a;
    margin-bottom: 12px;
    font-size: 1rem;
}

.file-upload-grid {
    display: grid;
    gap: 16px;
}

.upload-label {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 18px;
    border: 1px dashed #94a3b8;
    border-radius: 10px;
    cursor: pointer;
    color: #334155;
    font-weight: 500;
    background: #f8fafc;
}

.upload-label input {
    display: none;
}

.drop-zone {
    border: 2px dashed #cbd5f5;
    border-radius: 12px;
    padding: 28px 20px;
    text-align: center;
    color: #64748b;
    background: #f8fafc;
    transition: border-color 0.2s ease, background 0.2s ease;
}

.drop-zone.dragover {
    border-color: #4f46e5;
    background: #eef2ff;
    color: #4338ca;
}

.url-input-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.url-input-group input {
    flex: 1;
    min-width: 220px;
    border: 1px solid #cbd5f5;
    border-radius: 10px;
    padding: 12px 14px;
    font-size: 1rem;
}

.primary-btn,
.secondary-btn {
    border: none;
    border-radius: 10px;
    padding: 12px 18px;
    font-size: 0.95rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.primary-btn {
    background: #4f46e5;
    color: #fff;
    box-shadow: 0 10px 20px rgba(79, 70, 229, 0.18);
}

.primary-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    box-shadow: none;
}

.secondary-btn {
    background: #e2e8f0;
    color: #0f172a;
}

.primary-btn:hover:not(:disabled),
.secondary-btn:hover {
    transform: translateY(-1px);
}

.option-row {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    align-items: center;
}

.option-row label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
    color: #1e293b;
}

.case-select {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.case-select button {
    border: 1px solid #cbd5f5;
    border-radius: 999px;
    padding: 8px 18px;
    background: #fff;
    color: #0f172a;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s ease;
}

.case-select button.active {
    background: #4f46e5;
    color: #fff;
    border-color: transparent;
}

.table-wrapper {
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    overflow-x: auto;
    background: #fff;
}

.csv-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

.csv-table th,
.csv-table td {
    border: 1px solid #e2e8f0;
    padding: 12px;
    text-align: left;
    font-size: 0.95rem;
}

.csv-table thead {
    background: #eef2ff;
    position: sticky;
    top: 0;
    z-index: 1;
}

.csv-table td {
    background: #fff;
}

.csv-table td[contenteditable="true"] {
    cursor: text;
}

.table-placeholder {
    text-align: center;
    padding: 40px;
    color: #94a3b8;
}

.status-bar {
    margin-top: 16px;
    display: flex;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    font-size: 0.9rem;
    color: #475569;
}

.status-bar .status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.status.success {
    color: #16a34a;
}

.status.error {
    color: #dc2626;
}

.status.info {
    color: #2563eb;
}

.related-tools {
    padding: 0 20px 20px;
    margin-top: -10px;
}

.related-tools .tool-container {
    max-width: 1100px;
    margin: 0 auto;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 15px 45px rgba(15, 23, 42, 0.08);
    padding: 28px;
}

.related-tools h2 {
    font-size: 1.4rem;
    color: #0f172a;
    margin-bottom: 18px;
}

.related-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 14px;
}

.related-tool-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    background: #f8fafc;
    color: #0f172a;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
}

.related-tool-link i {
    color: #4f46e5;
}

.related-tool-link:hover {
    background: #eef2ff;
    border-color: #c7d2fe;
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .csv-viewer-tool {
        padding: 20px 12px 60px;
    }

    .csv-viewer-tool .tool-container {
        padding: 20px;
    }

    .url-input-group {
        flex-direction: column;
    }

    .primary-btn,
    .secondary-btn {
        width: 100%;
        justify-content: center;
    }

    .case-select {
        width: 100%;
    }

    .case-select button {
        flex: 1;
        text-align: center;
    }

    .option-row {
        flex-direction: column;
        align-items: flex-start;
    }

    .table-wrapper {
        border-radius: 10px;
    }

    .related-tools {
        padding: 0 12px 20px;
    }

    .related-tools .tool-container {
        padding: 20px;
    }
}