body {
    background-color: #f5f5f5;
    padding-top: 76px;
    padding-bottom: 20px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft Yahei', sans-serif;
}

.tool-container {
    max-width: 1100px;
    margin: 20px auto 40px auto;
}

.tool-card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.08);
}

.tool-card .card-header {
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.tool-card .card-footer {
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.input-area,
.preview-area,
.result-area {
    background: #fdfdfd;
    border-radius: 10px;
    padding: 16px;
    min-height: 220px;
    font-family: 'JetBrains Mono', 'Courier New', Courier, monospace;
    font-size: 14px;
    line-height: 1.6;
    border: 1px solid #e0e6ed;
    resize: vertical;
}

.preview-area,
.result-area {
    overflow-y: auto;
    max-height: 380px;
}

.preview-item {
    border-bottom: 1px dashed #e0e6ed;
    padding: 6px 4px;
    font-family: 'JetBrains Mono', 'Courier New', Courier, monospace;
    word-break: break-all;
}

.preview-item:last-child {
    border-bottom: none;
}

.stats-card,
.info-card {
    background: #f3f6fb;
    border-radius: 10px;
    border: 1px solid #e0e6ed;
    padding: 16px;
}

.stats-card .stat-item {
    text-align: center;
}

.stats-card .stat-value {
    font-size: 1.8rem;
    font-weight: 700;
}

.stats-card .stat-label {
    color: #6c757d;
    font-size: 0.85rem;
}

.empty-placeholder {
    color: #999;
    text-align: center;
    padding: 40px 20px;
}

.empty-placeholder i {
    font-size: 48px;
    display: block;
    margin-bottom: 10px;
}

.option-group {
    background: #f9fafc;
    border-radius: 10px;
    border: 1px solid #e8ecf2;
    padding: 12px 16px;
    margin-bottom: 16px;
}

.option-group h6 {
    font-size: 0.95rem;
    font-weight: 600;
}

.badge-tip {
    font-size: 0.75rem;
    font-weight: 500;
    background: rgba(25, 135, 84, 0.1);
    color: #198754;
    border-radius: 999px;
    padding: 4px 10px;
}

.table-results tbody tr:hover {
    background-color: rgba(25, 135, 84, 0.08);
}

.helper-text {
    font-size: 0.8rem;
    color: #6c757d;
}

.result-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: rgba(13, 110, 253, 0.12);
    color: #0d6efd;
    border-radius: 999px;
    padding: 4px 10px;
    font-size: 0.75rem;
    font-weight: 500;
}

.result-tag.bad {
    background: rgba(220, 53, 69, 0.12);
    color: #dc3545;
}

.result-tag.good {
    background: rgba(25, 135, 84, 0.12);
    color: #198754;
}