@charset "UTF-8";
.header-container {
    background-color: var(--color-header);
    height: 75px;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    transition: all 0.5s ease;
    box-sizing: border-box;
    border-bottom: 1px solid var(--color-header-text); /* ヘッダーに下線を追加 */
    }

.header-txt {
    height: 100%;
    font-size: 24px;
    display: flex;
    justify-content: left;
    align-items: center;
    padding-left: 50px;
    gap: 30px;
    }

    /* リンクの文字の設定 */
.header-txt a {
    color: var(--color-header-text);
    text-decoration: none;
    font-weight: bold;
    font-size: 24px;
    transition: color 0.5s ease;
    }

    /* ホバー時に文字の色を白に */
.header-txt a:hover {
    color:var(--color-header-text-hover);
    }

.theme-toggle-btn {
    background: none;
    border: 2px solid var(--color-header-text);
    color: var(--color-header-text);
    padding: 5px 12px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: bold;
    font-size: 14px;
    transition: all 0.5s ease;
    }

.theme-toggle-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    }