body {
            font-family: Arial, sans-serif;
            margin: 40px;
            background-color: #f9f9f9;
        }
        .container {
            max-width: 600px;
            margin: auto;
            background: #fff;
            padding: 32px 24px;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.07);
        }
        h1 {
            color: #2c3e50;
            margin-bottom: 16px;
        }
        p {
            color: #444;
            line-height: 1.6;
        }
        ul {
            margin-top: 16px;
        }
        /* Label styling for forms */
        label,
        .form_label {
            font-family: 'Segoe UI', Arial, sans-serif;
            font-size: 1rem;
            color: #2c3e50;
            font-weight: 500;
            letter-spacing: 0.01em;
            margin-bottom: 4px;
            display: inline-block;
        }

        /* Apple-style form input fields */
        input[type="text"],
        input[type="email"],
        .form_input {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
            font-size: 1.05rem;
            width: 100%;
            max-width: 350px;
            min-width: 180px;
            box-sizing: border-box;
            padding: 12px 16px;
            border: 1px solid #d1d1d6;
            border-radius: 12px;
            background: #f5f5f7;
            color: #1c1c1e;
            box-shadow: 0 1px 2px rgba(60,60,67,0.03);
            transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
            outline: none;
            appearance: none;
            margin-bottom: 12px;
        }
        input[type="text"]:focus,
        input[type="email"]:focus,
        .form_input:focus {
            border-color: #0071e3;
            background: #fff;
            box-shadow: 0 0 0 2px rgba(0,113,227,0.15);
        }
        input[type="text"]:disabled,
        input[type="email"]:disabled,
        .form_input:disabled {
            background: #e9e9eb;
            color: #b1b1b3;
            border-color: #e9e9eb;
        }
        /* Remove autofill yellow in Chrome */
        input:-webkit-autofill,
        input:-webkit-autofill:focus {
            box-shadow: 0 0 0 1000px #f5f5f7 inset !important;
            -webkit-text-fill-color: #1c1c1e !important;
        }

        /* Apple-style button */
        button,
        .add_contact_btn,
        .search_btn {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
            font-size: 1.05rem;
            font-weight: 600;
            padding: 12px 28px;
            border: none;
            border-radius: 12px;
            background: linear-gradient(180deg, #f5f5f7 0%, #e5e5ea 100%);
            color: #0071e3;
            box-shadow: 0 1px 2px rgba(60,60,67,0.03);
            cursor: pointer;
            transition: background 0.2s, color 0.2s, box-shadow 0.2s;
            outline: none;
            margin-top: 8px;
            margin-bottom: 8px;
            letter-spacing: 0.01em;
        }
        button:hover,
        .add_contact_btn:hover,
        .search_btn:hover {
            background: linear-gradient(180deg, #eaf6ff 0%, #d1eaff 100%);
            color: #005bb5;
            box-shadow: 0 2px 8px rgba(0,113,227,0.10);
        }
        button:active,
        .add_contact_btn:active,
        .search_btn:active {
            background: linear-gradient(180deg, #e5e5ea 0%, #f5f5f7 100%);
            color: #003366;
        }
        button:disabled,
        .add_contact_btn:disabled,
        .search_btn:disabled {
            background: #e9e9eb;
            color: #b1b1b3;
            cursor: not-allowed;
            box-shadow: none;
        }

        /* Make the contacts table visible and styled */
        .contact_table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 32px;
            background: #fff;
            box-shadow: 0 2px 8px rgba(0,0,0,0.07);
        }
        .contact_table th, .contact_table td {
            border: 1px solid #e0e0e0;
            padding: 12px 16px;
            text-align: left;
        }
        .contact_table th {
            background-color: #f2f6fa;
            color: #2c3e50;
            font-weight: 600;
        }
        .contact_table tr:nth-child(even) {
            background-color: #f9fbfd;
        }
        .contact_table tr:hover {
            background-color: #eaf6ff;
        }

        /* Responsive: hide email column on small screens */
        @media (max-width: 600px) {
            .contact_table_cell_email,
            .contact_table th.contact_table_cell_email {
                display: none;
            }
        }