header {
    position: fixed;
    top: 0;
    left: 0;
    max-width: 100%;
    background-color:#fff;
    width: 100%;
    padding: 30px 20px 10px 20px;
    z-index:999;
}

    header .container {
        margin: 0 auto;
        padding: 0 20px;
        overflow: visible;
    }

#logo {
    float: left;
    font-size: 1.5em;
    display: grid;
    grid-auto-flow: column;
    justify-content: center;
    align-items: end;
    /*align-items: center;*/
    gap: 10px;
}

.logo-icon {
    width: 65px;
    margin-top: -20px;
    margin-left: -20px;
}

.logo-icon-mini {
    width: 70px;
}


.sns-icon i {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px; /* 圆形直径 */
    height: 28px; /* 圆形直径 */
    background-color: #444; /* 黑色背景 */
    color: #fff; /* 白色图标 */
    border-radius: 50%; /* 圆形效果 */
    font-size: 16px; /* 图标大小 */
    margin: 0 7px;
}

.sns-icon.facebook:hover i {
    background-color: #1877F2; /* Facebook公式ブルー */
    transform: scale(1.1);
}

.sns-icon.linkedin:hover i {
    background-color: #0077B5; /* LinkedIn公式ブルー */
    transform: scale(1.1);
}

.header-nav {
    float: right;
    display: grid;
    grid-auto-flow: column;
    justify-content: center;
    align-items: center;
    /*align-items: center;*/
    gap: 2rem;
    margin-right: 30px;
}

.nav-links {
    list-style-type: none;
    margin: 0;
    padding: 0;
}

    .nav-links li {
        display: inline-block;
        margin-left: 30px;
    }

        .nav-links li a {
            color: #444;
            font-weight: 700;
            font-size: 1.4rem;
           /* letter-spacing: 0.1em;*/
            text-decoration: none;
            align-items: center;
            position: relative;
            display: inline-block;
            transition: background-color 0.3s;
        }

            .nav-links li a:hover {
                color: #C8B390;
            }

            /* ナビゲーションの項目の下に下線を表示 */
            /*.nav-links li a::after {
                content: '';
                position: absolute;
                left: 50%;
                transform: translateX(-50%);
                bottom: -5px;
                width: 0;
                height: 2px;
                background-color: #C8B390;
                transition: width 0.3s;
            }
             
            .nav-links li a:hover::after {
                width: 50%;
            }

            .nav-links li a.active::after {
                width: 50%;
            }*/

.burger {
    display: none;
    cursor: pointer;
}

    .burger div {
        width: 25px;
        height: 3px;
        background-color: #000;
        margin: 5px;
        transition: transform 0.3s, background-color 0.3s;
    }

.content {
    padding-top: 80px;
}

@media screen and (max-width: 992px) {
    .header-nav {
        gap: 0.5rem;
        margin-right: 10px;
    }

    .logo-icon {
        margin-top: -10px;
        margin-left: -10px;
        width: 50px;
    }
}
@media screen and (max-width: 768px) {
    header {
        padding: 15px;
    }

        header .container {
            padding: 0 5px;
        }

    #logo {
        float: left;
        font-size: 1.1em;
        display: grid;
        grid-auto-flow: column;
        justify-content: center;
        align-items: end;
        /*align-items: center;*/
        gap: 5px;
    }

    .nav-links {
        display: none;
        text-align: center;
        width: 100%;
        height: 100vh;
        position: absolute;
        background-color: #333;
        top: 60px;
        left: 0;
        z-index: 1;
    }

        .nav-links.active {
            display: block;
        }

        .nav-links li {
            display: block;
            margin: 30px 0;
        }

            .nav-links li a {
                color: #fff;
            }

    .burger {
        display: block;
        float: right;
        margin-top: 5px;
        margin-right: 15px;
    }

        .burger.active .line1 {
            transform: rotate(-45deg) translate(-5px, 6px);
        }

        .burger.active .line2 {
            opacity: 0;
        }

        .burger.active .line3 {
            transform: rotate(45deg) translate(-5px, -6px);
        }

    .content {
        padding-top: 60px;
    }
}