/* Nouveau design pro et responsive */
    * { margin: 0; padding: 0; box-sizing: border-box; }
    body {
        font-family: 'Segoe UI', Roboto, sans-serif;
        background: linear-gradient(135deg, #141e30, #243b55);
        color: #333;
        display: flex;
        justify-content: center;
        align-items: center;
        min-height: 100vh;
        padding: 20px;
    }
    .container {
        width: 100%;
        max-width: 850px;
        background: #fff;
        border-radius: 16px;
        box-shadow: 0 8px 25px rgba(0,0,0,0.25);
        padding: 30px;
        animation: fadeIn 0.6s ease-out;
    }
    h1 {
        text-align: center;
        font-size: 2rem;
        color: #141e30;
        margin-bottom: 10px;
        letter-spacing: 1px;
    }
    h2 {
        font-size: 1.4rem;
        color: #243b55;
        margin-bottom: 15px;
        text-align: center;
    }
    .container p[style*="color:red"] {
        background: #ffe5e5;
        border-left: 4px solid #e74c3c;
        color: #c0392b !important;
        padding: 12px;
        border-radius: 6px;
        margin: 15px 0;
        font-weight: 500;
        text-align: center;
    }
    .pricing-tables-wrap {
        display: flex;
        flex-direction: column;
        gap: 25px;
    }
    .pricing-table-inner {
        padding: 20px;
        border-radius: 12px;
        background: #f9f9fb;
        border: 1px solid #e0e0e0;
        transition: transform 0.3s, box-shadow 0.3s;
    }
    .pricing-table-inner:hover {
        transform: translateY(-5px);
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    }
    .pricing-table-features { list-style: none; margin-top: 10px; }
    .pricing-table-features li {
        margin: 12px 0;
        font-size: 1rem;
        color: #555;
    }
    select, input[type="text"], input[type="password"] {
        width: 100%;
        padding: 14px 12px;
        border-radius: 8px;
        border: 1px solid #ccc;
        font-size: 1rem;
        margin-top: 10px;
        transition: border-color 0.3s;
    }
    select:focus, input:focus { border-color: #243b55; outline: none; }
    input[type="button"], input[type="submit"], .paypal-button {
        display: inline-block;
        background: linear-gradient(135deg, #243b55, #141e30);
        color: #fff;
        border: none;
        padding: 14px 20px;
        border-radius: 8px;
        font-size: 1rem;
        font-weight: 600;
        cursor: pointer;
        margin-top: 15px;
        transition: transform 0.2s, box-shadow 0.3s;
    }
    input[type="button"]:hover, input[type="submit"]:hover, .paypal-button:hover {
        transform: translateY(-2px);
        box-shadow: 0 5px 15px rgba(20,30,48,0.3);
    }
    .parrain-section {
        margin-top: 20px;
        text-align: center;
    }
    .parrain-section label {
        display: block;
        margin-bottom: 8px;
        font-weight: bold;
        color: #243b55;
    }
    #paypal-button-container, #premium-paypal-button-container {
        text-align: center;
        margin-top: 20px;
    }
    #premium-section { display: none; margin-top: 30px; }
    @keyframes fadeIn {
        from { opacity: 0; transform: translateY(20px); }
        to { opacity: 1; transform: translateY(0); }
    }
    @media (max-width: 600px) {
        .container { padding: 20px; }
        h1 { font-size: 1.6rem; }
        h2 { font-size: 1.2rem; }
    }