body {
        margin: 0;
        padding: 0;
        background: #ffffff;
        font-family: "Segoe UI", sans-serif;
        display: flex;
        justify-content: center;
        align-items: center;
        height: 100vh;
        color: #111;
    }

    .wrap {
        width: 320px;
        text-align: left;
    }

    .banner {
        width: 100%;
        margin-bottom: 25px;
        border-radius: 10px;
    }

    .title {
        font-size: 26px;
        font-weight: 700;
        margin-bottom: 30px;
        letter-spacing: -1px;
        border-left: 6px solid #000;
        padding-left: 10px;
    }

    label {
        font-size: 13px;
        font-weight: 600;
        display: block;
        margin-bottom: 6px;
        color: #333;
    }

    input {
        width: 100%;
        padding: 12px 10px;
        border: none;
        border-bottom: 2px solid #000;
        font-size: 15px;
        outline: none;
        background: transparent;
        transition: 0.2s;
    }

    input:focus {
        border-bottom-color: #0078d4;
    }

    button {
        margin-top: 25px;
        width: 100%;
        padding: 12px;
        border: 2px solid #000;
        background: #fff;
        font-size: 15px;
        font-weight: 700;
        cursor: pointer;
        transition: 0.2s;
    }

    button:hover {
        background: #000;
        color: #fff;
    }

    .note {
        margin-top: 20px;
        font-size: 11px;
        color: #666;
        text-align: center;
    }

.error {
    font-size: 14px;
    color: #c00;
    margin-top: 20px;
    line-height: 1.6;
}

    /* ▼ スマホ用 */
    @media (max-width: 480px) {
        .wrap {
            width: 90%; /* 画面幅に合わせて広がる */
        }
        .title {
            font-size: 22px;
        }
        input {
            font-size: 17px;
            padding: 14px 10px;
        }
        button {
            font-size: 17px;
            padding: 14px;
        }
    }