```css
/* =========================
   基本設定
========================= */

* {
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    margin: 0;
    min-height: 100vh;

    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Helvetica Neue",
        "Hiragino Kaku Gothic ProN",
        "Hiragino Sans",
        "Yu Gothic",
        sans-serif;

    color: #ffffff;

    background: linear-gradient(
        135deg,
        #168cff 0%,
        #5b5bea 50%,
        #9b3cff 100%
    );

    background-attachment: fixed;
}


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

.profile-page {
    width: 100%;
    max-width: 680px;

    margin: 0 auto;
    padding: 60px 24px 40px;
}


/* =========================
   プロフィール
========================= */

.profile {
    text-align: center;
    margin-bottom: 42px;
}

.profile-image {
    width: 112px;
    height: 112px;

    object-fit: cover;

    border-radius: 50%;

    border: 3px solid rgba(255,255,255,0.9);

    box-shadow:
        0 10px 30px rgba(0,0,0,0.35);

    margin-bottom: 20px;
}

.profile h1 {
    margin: 0;

    font-size: 28px;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.username {
    margin: 7px 0 18px;

    font-size: 14px;
    color: rgba(255,255,255,0.55);
}

.description {
    margin: 0;

    font-size: 15px;
    line-height: 1.8;

    color: rgba(255,255,255,0.82);
}


/* =========================
   リンク
========================= */

.links {
    display: flex;
    flex-direction: column;
    gap: 14px;
}


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

.link-card {
    display: flex;
    align-items: center;

    width: 100%;
    min-height: 72px;

    padding: 12px 18px;

    color: #ffffff;
    text-decoration: none;

    background: rgba(255,255,255,0.08);

    border: 1px solid rgba(255,255,255,0.10);

    border-radius: 18px;

    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);

    transition:
        transform 0.2s ease,
        background 0.2s ease,
        border-color 0.2s ease;
}

.link-card:hover {
    transform: translateY(-2px);

    background: rgba(255,255,255,0.14);

    border-color: rgba(255,255,255,0.20);
}

.link-card:active {
    transform: scale(0.98);
}


/* =========================
   SNSアイコン
========================= */

.link-icon {
    width: 44px;
    height: 44px;

    display: flex;
    align-items: center;
    justify-content: center;

    flex-shrink: 0;

    border-radius: 12px;

    font-size: 22px;
    font-weight: 600;

    background: rgba(255,255,255,0.12);
}

.link-icon.instagram {
    font-size: 27px;
}

.link-icon.youtube {
    font-size: 18px;
}


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

.link-text {
    display: flex;
    flex-direction: column;

    margin-left: 15px;

    min-width: 0;
}

.link-text strong {
    font-size: 16px;
    font-weight: 600;
}

.link-text span {
    margin-top: 3px;

    font-size: 12px;

    color: rgba(255,255,255,0.55);

    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}


/* =========================
   矢印
========================= */

.link-arrow {
    margin-left: auto;

    font-size: 27px;
    font-weight: 300;

    color: rgba(255,255,255,0.45);
}


/* =========================
   ギャラリー
========================= */

.gallery-card {
    display: flex;
    align-items: center;

    min-height: 90px;

    padding: 10px;

    color: #ffffff;
    text-decoration: none;

    background: rgba(255,255,255,0.08);

    border: 1px solid rgba(255,255,255,0.10);

    border-radius: 18px;

    overflow: hidden;

    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);

    transition:
        transform 0.2s ease,
        background 0.2s ease;
}

.gallery-card:hover {
    transform: translateY(-2px);

    background: rgba(255,255,255,0.14);
}

.gallery-preview {
    width: 72px;
    height: 70px;

    flex-shrink: 0;

    overflow: hidden;

    border-radius: 12px;
}

.gallery-preview img {
    width: 100%;
    height: 100%;

    object-fit: cover;

    transition: transform 0.4s ease;
}

.gallery-card:hover .gallery-preview img {
    transform: scale(1.08);
}

.gallery-info {
    display: flex;
    flex-direction: column;

    margin-left: 15px;
}

.gallery-info strong {
    font-size: 16px;
}

.gallery-info span {
    margin-top: 3px;

    font-size: 12px;

    color: rgba(255,255,255,0.55);
}


/* =========================
   フッター
========================= */

footer {
    margin-top: 45px;

    text-align: center;

    font-size: 11px;

    color: rgba(255,255,255,0.35);
}


/* =========================
   スマートフォン
========================= */

@media (max-width: 480px) {

    .profile-page {
        padding: 45px 16px 30px;
    }

    .profile {
        margin-bottom: 32px;
    }

    .profile-image {
        width: 96px;
        height: 96px;
    }

    .profile h1 {
        font-size: 24px;
    }

    .description {
        font-size: 14px;
    }

    .link-card {
        min-height: 68px;
        border-radius: 16px;
    }

}


/* =========================
   大画面
========================= */

@media (min-width: 900px) {

    .profile-page {
        padding-top: 80px;
    }

}
```