h2 {
    border: none !important;
    background-color: transparent !important;
}

@media (min-width: 1024px) {
    .l-header__content {
        width: 199px !important;
        background-color: #fff !important;
    }
}

.l-contents__container {
    padding: 0 !important;
}

.lecture-container.lecture-container {
    display: flex !important;
    flex-direction: row !important;
    flex-wrap: nowrap !important;
    padding: 0 !important;
    margin: 0 !important;
    align-items: start;
    gap: 0;
}

.lecture-sidebar {
    height: 100vh;
    background: #fff;
    border-right: 1px solid #c4c4c4;
    flex: 0 0 200px;
    width: 200px;
    overflow-y: scroll;
}

.lecture-sidebar__menu,
.lecture-sidebar__sub-menu {
    margin: 0;
    padding: 0;
    list-style: none;
}

.lecture-sidebar__menu {
    margin-top: 120px;
    margin-bottom: 30px;
}

.lecture-sidebar__link,
.lecture-sidebar__accordion-trigger,
.lecture-sidebar__sub-link {
    display: block;
    width: 100%;
    padding: 12px 16px;
    text-decoration: none;
    color: #333;
    border: none;
    background: none;
    text-align: left;
    box-sizing: border-box;
    letter-spacing: 0.55px !important;
}

.lecture-sidebar__accordion-trigger {
    cursor: pointer;
    font-weight: bold;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.lecture-sidebar__accordion-trigger::after {
    content: '▼';
    font-size: 10px;
    transition: transform 0.2s;
}

.lecture-sidebar__accordion-trigger.is-open::after {
    transform: rotate(180deg);
}

.lecture-sidebar__sub-menu {
    display: none;
    padding-left: 16px;
}

.lecture-sidebar__sub-menu.is-open {
    display: block;
}

.lecture-main-container {
    flex: 1 1 0;
    min-width: 0;
    height: 100vh;
    overflow-y: scroll;
}

.lecture-content-inner {
    max-width: 1140px;
    margin: 0 auto !important;
    padding: 60px;
}

.lecture-buttons {
    display: flex;
    margin-top: 20px !important;
}

.lecture-button {
    display: inline-block;
    color: #fff !important;
    padding: 4px 8px;
    font-size: 12px;
}

.lecture-next-button {
    margin-left: auto;
}

.lecture-button.is-active {
    background-color: #e44270;
}

.lecture-button.is-disabled {
    background-color: #c4c4c4;
    opacity: 1;
}

input[type="radio"] {
    margin-left: 10px;
}

.smf-action .smf-button-control {
    margin: 32px auto;
    display: block;
    width: fit-content;
}

.lecture-test1 input[type="text"],
.lecture-test1 input[type="email"] {
    width: 300px;
}

/* ハンバーガーボタン（デスクトップでは非表示） */
.lecture-sidebar__hamburger {
    display: none;
}

@media screen and (max-width: 1023px) {
    .lecture-sidebar__hamburger {
        display: block;
        position: fixed;
        top: 30px;
        left: 0;
        right: 0;
        background: #fff;
        border: none;
        border-bottom: 1px solid #c4c4c4;
        font-size: 18px;
        cursor: pointer;
        z-index: 200;
        box-sizing: border-box;
        width: calc(100vw - 10px);
        text-align: center;
        margin-left: 5px !important;
    }

    .lecture-sidebar {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        width: calc(100vw - 10px) !important;
        height: auto;
        max-height: calc(100vh - 64px);
        overflow-y: auto;
        transform: translateY(-110%);
        transition: transform 0.3s ease;
        z-index: 199;
        margin-left: 5px !important;
        flex: none;
        border-right: none;
        border-bottom: 1px solid #c4c4c4;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    }

    .lecture-sidebar.is-open {
        transform: translateY(0);
    }

    .lecture-sidebar__menu {
        margin-top: 0;
        padding: 8px 0;
    }

    .lecture-main-container {
        margin: 90px auto 0 !important;
    }

    .lecture-content-inner {
        padding: 0 10px;
    }

}

.is-active {
    color: #222;
}

.is-current {
    color: #e44270;
    pointer-events: none;
}

.is-disabled {
    color: #999;
    cursor: not-allowed;
    pointer-events: none;
    opacity: .5;
}