.address-card {
            background: #f8fafc;
            border-radius: 16px;
            padding: 1.8rem;
            border: 1px solid #e2e8f0;
            transition: all 0.2s ease;
            box-shadow: 0 2px 5px rgba(0,0,0,0.02);
        }
        .address-card:hover {
            border-color: var(--primary-color, #4682b4);
            box-shadow: 0 8px 20px rgba(0,0,0,0.05);
        }
        .address-line {
            font-family: 'SF Mono', 'Courier New', monospace;
            font-size: 1.1rem;
            letter-spacing: 0.01em;
            padding: 0.5rem 0;
            border-bottom: 1px dashed #cbd5e1;
        }
        .address-label {
            font-weight: 600;
            width: 160px;
            display: inline-block;
            color: #2c3e66;
        }
        .json-preview {
            background-color: #1e293b;
            color: #e2e8f0;
            padding: 1rem;
            border-radius: 12px;
            font-size: 0.85rem;
            font-family: monospace;
            white-space: pre-wrap;
            word-break: break-word;
        }
        .history-item {
            background: white;
            border-radius: 12px;
            padding: 0.75rem 1rem;
            margin-bottom: 0.6rem;
            border-left: 3px solid var(--primary-color);
            font-size: 0.85rem;
            box-shadow: 0 1px 2px rgba(0,0,0,0.03);
        }
        .country-badge {
            font-size: 0.7rem;
            background: #eef2ff;
            color: #1e40af;
            border-radius: 30px;
            padding: 0.2rem 0.6rem;
        }
        .stat-badge {
            background-color: #e6f7ec;
            color: #2e7d32;
            border-radius: 20px;
            padding: 0.25rem 0.8rem;
            font-size: 0.75rem;
            font-weight: 500;
        }
        .section-title {
            font-size: 1.6rem;
            font-weight: 600;
            border-left: 5px solid var(--primary-color);
            padding-left: 1rem;
            margin: 1.5rem 0 1rem 0;
        }
        .tool-header h1 {
            font-size: 2rem;
        }
        @media (max-width: 768px) {
            .address-label { width: 120px; font-size: 0.85rem; }
            .address-line { font-size: 0.9rem; }
        }