* {
        box-sizing: border-box;
    }

    body {
        margin: 0;
        min-height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
            "Noto Sans KR", sans-serif;
        background: linear-gradient(135deg, #667eea, #764ba2);
        color: #222;
    }

    .container {
        width: 90%;
        max-width: 520px;
    }

    .card {
        background: rgba(255, 255, 255, 0.97);
        border-radius: 24px;
        padding: 45px 35px;
        text-align: center;
        box-shadow: 0 20px 50px rgba(0, 0, 0, 0.2);
    }

    .icon {
        width: 70px;
        height: 70px;
        margin: 0 auto 20px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 50%;
        background: #eef2ff;
        font-size: 32px;
    }

    h1 {
        margin: 0 0 10px;
        font-size: 28px;
        font-weight: 700;
    }

    .description {
        margin: 0 0 30px;
        color: #777;
        font-size: 15px;
    }

    .ip-box {
        padding: 25px 15px;
        border-radius: 16px;
        background: #f5f7ff;
        border: 1px solid #e3e7ff;
        margin-bottom: 25px;
    }

    .label {
        display: block;
        margin-bottom: 10px;
        color: #777;
        font-size: 13px;
        font-weight: 600;
    }

    #ip {
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
        color: #4f46e5;
        font-size: 32px;
        font-weight: 800;
        letter-spacing: 1px;
        word-break: break-all;
    }

    .refresh-btn {
        width: 100%;
        padding: 14px;
        border: 0;
        border-radius: 12px;
        background: #4f46e5;
        color: white;
        font-size: 16px;
        font-weight: 600;
        cursor: pointer;
        transition: 0.2s;
    }

    .refresh-btn:hover {
        background: #4338ca;
        transform: translateY(-1px);
    }

    .refresh-btn:active {
        transform: translateY(0);
    }

    .footer {
        margin-top: 22px;
        color: #999;
        font-size: 12px;
    }

    @media (max-width: 480px) {
        .card {
            padding: 35px 20px;
        }

        h1 {
            font-size: 24px;
        }

        #ip {
            font-size: 25px;
        }
    }