/******************************* sidebar *******************************/

aside {
    width: 220px;
    flex-shrink: 0;
    background: var(--surface-strong);
    border-right: var(--border);
    overflow-y: auto;
    font-family: var(--sans-font);
    padding: 15px 0;
    box-shadow: 2px 0 8px #0000000a;
}

aside h3 {
    color: var(--accent);
    text-align: right;
    margin: 18px 18px 12px 0;
    font-size: 14px;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: .5px;
}

aside div.sidebar-content-container {
    margin: 0 10px;
}

aside div.sidebar-item {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    height: 40px;
    color: var(--text);
    margin: 7px 8px 7px 0;
    padding-right: 16px;
    background: var(--surface-soft);
    border-radius: 0 8px 8px 0;
    border-right: 3px solid transparent;
    transition: all .25s ease;
}

aside div.sidebar-item :where(i, img) {
    margin-right: 10px !important;
    width: 18px;
    height: 18px;
    font-size: 16px;
    color: var(--accent);
}

aside div.sidebar-item img.avatar {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    margin-right: 6px;
    object-fit: cover;
}

aside div.sidebar-item:not(.disabled):hover {
    background: var(--primary);
    color: white;
    border-right: 3px solid var(--primary-soft);
    cursor: pointer;
}

aside div.sidebar-item:not(.disabled):hover i {
    color: white;
}

aside div.sidebar-item.disabled {
    color: var(--muted);
    background: var(--surface-strong);
}

aside a.sidebar-link {
    text-decoration: none;
    color: inherit;
}

/******************************* articles *******************************/

div.article-container {
    display: flex;
    overflow-y: auto;
    flex-grow: 1;
    padding: 0 72px;
    gap: 18px;
    scroll-behavior: smooth;
}

div.height-fixed-area,
article.height-fixed-article {
    position: sticky;
    top: 0;
    height: inherit !important;
    overflow-y: auto;
    scroll-behavior: smooth;
}

div:is(.main-area, .central-area, .side-area) {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    gap: 24px;
    padding: 32px 8px;
    height: fit-content;
}

div:is(.main-area, .central-area, .side-area)>:where(h1, h2, h3, h4, h5, h6) {
    margin: 0;
}

article.basic-article,
article.toc-container,
article.content-container {
    padding: 18px;
    height: fit-content;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: var(--border);
    background: var(--surface);
    font-family: var(--main-font);
}

div.main-area {
    width: 75%;
}

div.central-area {
    width: 45%;
}

div.side-area {
    width: 30%;
}

div.central-area img {
    width: 100%;
}

div.side-area textarea.submit-input {
    height: 80px;
}

div.side-area h3 {
    clear: both;
}

article.toc-container h3 {
    margin-bottom: 0;
}

nav.table-of-contents ul {
    padding-left: 16px;
}

nav.table-of-contents li {
    padding-top: 8px;
}

nav.table-of-contents a,
article.content-container a,
footer a {
    text-decoration: none;
    color: var(--accent);
}

nav.table-of-contents a:hover,
article.content-container a:hover,
footer a:hover {
    text-decoration: underline;
}

article#contentContainer,
article.content-container nav.table-of-contents,
div.height-fixed-area::-webkit-scrollbar {
    display: none;
}

/******************************* footer *******************************/

footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    height: 50px;
    flex-shrink: 0;
    background-color: var(--surface-soft);
    border-top: var(--border);
    box-shadow: var(--shadow);
    font-size: 12px;
    color: var(--text);
    padding: 5px;
}

footer p {
    margin: 2px;
}

footer p.beian-info {
    display: flex;
    align-items: center;
    gap: 15px;
    font-family: var(--sans-font);
}

footer p.beian-info a.beian-link {
    display: inline-flex;
    align-items: center;
}

footer p.beian-info a.beian-link img.beian-icon {
    width: 13px;
    margin-right: 4px;
}

/******************************* responsive *******************************/

@media (max-width: 768px) {

    aside,
    article.toc-container {
        display: block;
        position: fixed;
        top: 80px;
        left: 0;
        height: calc(100vh - 80px);
        width: 50%;
        max-width: 320px;
        z-index: 1500;
        background: var(--surface-strong);
        border-right: var(--border);
        box-shadow: 2px 8px 30px #00000040;
        padding-top: 12px;
        overflow-y: auto;
        transform: translateX(-100%);
        transition: transform .25s cubic-bezier(.2, .9, .2, 1), visibility .25s linear;
        visibility: hidden;
    }

    article.toc-container {
        top: 90px;
        left: 10px;
        height: calc(100vh - 110px);
    }

    .sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: #00000059;
        z-index: 1400;
        opacity: 0;
        pointer-events: none;
        transition: opacity .2s ease;
    }

    #sidebar-toggle:checked~main .sidebar-overlay {
        opacity: 1;
        pointer-events: auto;
    }

    #sidebar-toggle:checked~main aside {
        transform: translateX(0);
        visibility: visible;
    }

    main {
        flex-direction: column;
        scroll-behavior: smooth;
    }

    div.article-container {
        flex-direction: column;
        overflow: hidden;
        padding: 6px;
    }

    div:is(.main-area, .central-area, .side-area) {
        padding: 8px;
    }

    div:is(.main-area, .central-area, .side-area),
    article.content-container {
        width: 100%;
        overflow: visible;
    }
}