/* ===========================
   基本設定
=========================== */

body{

    margin:0;
    background:#000;
    color:#fff;
    font-family:"Yu Mincho",serif;

}

html{

    scroll-behavior:smooth;

}

/* ===========================
   背景
=========================== */

.background{

    position:fixed;

    top:0;
    left:0;

    width:100%;
    height:100svh;

    background:url("images/background.jpg") center center / cover no-repeat;

    filter:brightness(.33);

    z-index:-1;

}

/* ===========================
   全体
=========================== */

.container{

    width:92%;
    max-width:1500px;

    margin:auto;

    padding:70px 0 100px;

    position:relative;

}

/* ===========================
   戻るボタン
=========================== */

.top-button{

    position:absolute;

    top:40px;
    left:40px;

    padding:10px 24px;

    border:1px solid rgba(255,255,255,.25);
    border-radius:30px;

    color:#fff;
    text-decoration:none;

    transition:.35s;

}

.top-button:hover{

    color:#ffd8ea;

    border-color:#ffd8ea;

    box-shadow:0 0 18px rgba(255,180,220,.25);

}

/* ===========================
   タイトル
=========================== */

h1{

    margin:0;

    text-align:center;

    font-size:60px;

    font-weight:normal;

    letter-spacing:.35em;

}

.subtitle{

    text-align:center;

    margin:-15px 0 25px;

    font-size:18px;

    color:rgba(255,255,255,.65);

    letter-spacing:.2em;

}

/* CHARACTER・SPECIALと共通 */

.title-decoration{

    display:flex;

    justify-content:center;

    align-items:center;

    gap:20px;

    margin-bottom:60px;

}

.title-decoration::before,
.title-decoration::after{

    content:"";

    width:400px;

    height:1px;

    background:rgba(255,255,255,.25);

}

.title-decoration span{

    color:#fff;

    font-size:22px;

}

/* ===========================
   レイアウト
=========================== */

.layout{

    display:grid;

    grid-template-columns:170px 1fr;

    gap:90px;

    align-items:start;

}

/* ===========================
   左メニュー
=========================== */

.side-menu{

    position:sticky;

    top:70px;

}

.side-menu a{

    display:block;

    color:rgba(255,255,255,.72);

    text-decoration:none;

    letter-spacing:.18em;

    font-size:18px;

    margin-bottom:26px;

    text-align:center;

    transition:.35s;

}

.side-menu a::after{

    content:"";

    display:block;

    width:70px;

    height:1px;

    margin:12px auto 0;

    background:linear-gradient(
        90deg,
        transparent,
        rgba(255,255,255,.25),
        transparent
    );

    transition:.35s;

}

.side-menu a:hover{

    color:#ffd8ea;

    transform:translateX(6px);

}

.side-menu a:hover::after{

    width:100px;

    background:linear-gradient(
        90deg,
        transparent,
        #ffd8ea,
        transparent
    );

}

/* TOPだけ一番下 */

.menu-top{

    margin-top:auto !important;

}

/* ===========================
   メイン
=========================== */

.content{

    max-width:1000px;

}

section{

    position:relative;

    padding-bottom:20px;

    margin-bottom:20px;

}

section:not(:last-of-type)::after{

    content:"";

    display:block;

    width:70%;

    height:1px;

    margin:25px auto 0;

    background:linear-gradient(
        90deg,
        transparent,
        rgba(255,255,255,.25),
        transparent
    );

}

section h2{

    text-align:center;

    font-size:38px;

    font-weight:normal;

    letter-spacing:.18em;

    margin-bottom:18px;

}

.section-text{

    text-align:center;

    line-height:2.3;

    color:rgba(255,255,255,.82);

    margin-bottom:45px;

}
/* ===========================
   SNSカード
=========================== */

.sns-grid{

    display:grid;

    gap:28px;

}

.sns-card{

    display:flex;

    align-items:center;

    gap:28px;

    padding:28px;

    background:rgba(255,255,255,.08);

    border:1px solid rgba(255,255,255,.15);

    border-radius:18px;

    backdrop-filter:blur(10px);

    text-decoration:none;

    color:#fff;

    transition:.35s;

}

.sns-card:hover{

    transform:translateY(-5px);

    border-color:#ffd8ea;

    box-shadow:0 0 30px rgba(255,210,230,.25);

}

/* ===========================
   ロゴ
=========================== */

.youtube-logo,
.sns-logo,
.x-logo{

    width:120px;

    height:50px;

    object-fit:contain;

    flex-shrink:0;

}

.x-logo{

    width:52px;

    height:52px;

}

/* ===========================
   テキスト
=========================== */

.sns-card h3{

    margin:0 0 8px;

    font-size:24px;

    font-weight:normal;

    letter-spacing:.08em;

}

.sns-card p{

    margin:0;

    color:rgba(255,255,255,.72);

    line-height:1.8;

}

/* ===========================
   TOPボタン
=========================== */

.back{

    display:table;

    margin:70px auto 0;

    padding:12px 34px;

    border:1px solid rgba(255,255,255,.25);

    border-radius:30px;

    color:#fff;

    text-decoration:none;

    transition:.35s;

}

.back:hover{

    color:#ffd8ea;

    border-color:#ffd8ea;

    box-shadow:0 0 20px rgba(255,180,220,.3);

}
/* ===========================
   スマホ最適化
=========================== */

@media (max-width:900px){

    .container{

        width:92%;
        padding:45px 0 70px;

    }

    h1{

        font-size:34px;
        letter-spacing:.18em;

    }

    .subtitle{

        margin:-8px 0 20px;
        font-size:13px;
        letter-spacing:.12em;

    }

    /* タイトル飾り */

    .title-decoration{

        gap:14px;
        margin-bottom:35px;

    }

    .title-decoration::before,
    .title-decoration::after{

        width:120px;

    }

    .title-decoration span{

        font-size:18px;

    }

    /* TOPボタン非表示 */

    .top-button{

        display:none;

    }

    /* レイアウト */

    .layout{

        display:block;

    }

    /* 左メニュー非表示 */

    .side-menu{

        display:none;

    }

    .content{

        max-width:100%;

    }

    /* セクション */

    section{

        padding-bottom:18px;
        margin-bottom:18px;

    }

    section:not(:last-of-type)::after{

        width:90%;
        margin:22px auto 0;

    }

    section h2{

        font-size:28px;
        margin-bottom:20px;

    }

    .section-text{

        font-size:14px;
        line-height:2.15;
        margin-bottom:30px;

    }

    /* SNSカード */

    .sns-card{

        gap:18px;

        padding:18px;

        border-radius:16px;

    }

    .sns-card h3{

        font-size:18px;

        margin-bottom:6px;

    }

    .sns-card p{

        font-size:14px;

        line-height:1.7;

    }

    /* ロゴ */

    .youtube-logo,
    .sns-logo{

        width:80px;

        height:40px;

    }

    .x-logo{

        width:36px;

        height:36px;

    }

/* TOPへ戻る */

.back{

    margin:55px auto 0;

}
}