:root {
    --docen-bg: #ffffff;
    --docen-text: #333333;
    --docen-sidebar-bg: #f8f9fa;
    --docen-sidebar-border: #e9ecef;
    --docen-accent: #0366d6;
    --docen-accent-hover: #0056b3;

    --docen-font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --docen-font-code: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

    --docen-radius: 4px;
    --docen-spacing: 24px;

    --docen-scrollbar-thumb: #ced4da;
    --docen-scrollbar-track: #f8f9fa;
}

[data-theme="dark"] {
    --docen-bg: #1e1e1e;
    --docen-text: #e0e0e0;
    --docen-sidebar-bg: #252526;
    --docen-sidebar-border: #333333;
    --docen-accent: #4daafc;
    --docen-accent-hover: #2b8ee4;

    --docen-scrollbar-thumb: #555555;
    --docen-scrollbar-track: #252526;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    /* Firefox */
    scrollbar-width: thin;
    scrollbar-color: var(--docen-scrollbar-thumb) var(--docen-scrollbar-track);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--docen-scrollbar-track);
    border-radius: var(--docen-radius);
}

::-webkit-scrollbar-thumb {
    background: var(--docen-scrollbar-thumb);
    border-radius: var(--docen-radius);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--docen-accent);
}

body {
    font-family: var(--docen-font-main);
    background-color: var(--docen-bg);
    color: var(--docen-text);
    line-height: 1.6;
}

.docen-container {
    display: flex;
    min-height: 100vh;
}

.docen-sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
    z-index: 900;
}

.docen-sidebar-backdrop.active {
    opacity: 1;
    visibility: visible;
}

.docen-mobile-menu-btn {
    display: none;
    position: fixed;
    top: 12px;
    right: 12px;
    z-index: 1100;
    width: 42px;
    height: 42px;
    border: 1px solid var(--docen-sidebar-border);
    border-radius: var(--docen-radius);
    background-color: var(--docen-bg);
    color: var(--docen-text);
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

.docen-sidebar {
    width: 250px;
    background-color: var(--docen-sidebar-bg);
    border-right: 1px solid var(--docen-sidebar-border);
    padding: var(--docen-spacing);
    flex-shrink: 0;

    position: sticky;
    top: 0;
    height: 100vh;
    overflow: visible;
    z-index: 100;

    display: flex;
    flex-direction: column;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
    height: 40px;
    position: relative;
}

.docen-logo {
    flex: 1;
    min-width: 0;
}

.docen-logo h2 {
    font-size: 1.5rem;
    font-weight: 600;
    transition: opacity 0.3s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

#sidebar-toggle {
    display: none;
}

#docen-nav {
    flex-grow: 1;
    overflow: visible;
}

.docen-logo h2 {
    margin-bottom: 12px;
}

/* Search Engine Base */
.docen-search {
    position: relative;
    margin-bottom: var(--docen-spacing);
    display: flex;
    align-items: center;
    border: 1px solid var(--docen-sidebar-border);
    border-radius: var(--docen-radius);
    background-color: var(--docen-bg);
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.docen-search.active {
    border-color: var(--docen-accent);
}

.docen-search input {
    width: 100%;
    padding: 8px 42px 8px 32px;
    border: none;
    background: transparent;
    color: var(--docen-text);
    font-family: inherit;
    font-size: 0.9em;
    outline: none;
}

.docen-search-shortcut {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
}

.docen-search .search-icon {
    position: absolute;
    left: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    color: var(--docen-text);
    opacity: 0.5;
    cursor: pointer;
    z-index: 2;
}

.docen-search-results {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-top: 4px;
    background-color: var(--docen-bg);
    border: 1px solid var(--docen-sidebar-border);
    border-radius: var(--docen-radius);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    max-height: 300px;
    overflow-y: auto;
    z-index: 100;
}

.docen-search-results.active {
    display: block;
}

.search-result-item {
    display: block;
    padding: 8px 12px;
    color: var(--docen-text);
    text-decoration: none;
    border-bottom: 1px solid var(--docen-sidebar-border);
    font-size: 0.9em;
}

.search-result-item:last-child {
    border-bottom: none;
}

.search-result-item:hover {
    background-color: rgba(3, 102, 214, 0.1);
    color: var(--docen-accent);
}

.search-result-title {
    font-weight: 600;
    margin-bottom: 2px;
}

.search-result-excerpt {
    font-size: 0.85em;
    opacity: 0.7;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Developer Mode Modal */
.docen-modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.docen-modal-overlay.active {
    display: flex;
}

.docen-modal-content {
    background: var(--docen-bg);
    border: 1px solid var(--docen-sidebar-border);
    border-radius: var(--docen-radius);
    width: 90%;
    max-width: 800px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    position: relative;
    padding: var(--docen-spacing);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.docen-modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: transparent;
    border: none;
    color: var(--docen-text);
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.2s;
}

.docen-modal-close:hover {
    opacity: 1;
}

.docen-modal-content h2 {
    margin-bottom: 8px;
    font-size: 1.5rem;
}

.docen-modal-warning {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85em;
    color: var(--docen-text);
    opacity: 0.8;
    margin-bottom: 24px;
    padding: 8px 12px;
    background-color: var(--docen-sidebar-bg);
    border-left: 3px solid var(--docen-accent);
    border-radius: var(--docen-radius);
}

.docen-modal-warning i {
    width: 16px;
    height: 16px;
    color: var(--docen-accent);
}

.docen-modal-warning code {
    font-family: var(--docen-font-code);
    background-color: var(--docen-bg);
    padding: 2px 4px;
    border-radius: 2px;
    border: 1px solid var(--docen-sidebar-border);
}

.docen-icon-search {
    width: 100%;
    padding: 10px 12px;
    margin-bottom: 24px;
    border: 1px solid var(--docen-sidebar-border);
    border-radius: var(--docen-radius);
    background-color: var(--docen-bg);
    color: var(--docen-text);
    font-family: inherit;
    font-size: 1em;
    outline: none;
    transition: border-color 0.2s;
}

.docen-icon-search:focus {
    border-color: var(--docen-accent);
}

.docen-icon-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 16px;
    overflow-y: auto;
    padding-right: 8px;
}

.docen-icon-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 16px;
    background: var(--docen-sidebar-bg);
    border: 1px solid var(--docen-sidebar-border);
    border-radius: var(--docen-radius);
    cursor: pointer;
    font-size: 0.8em;
    text-align: center;
    transition: background 0.2s, border-color 0.2s;
}

.docen-icon-item:hover {
    background: var(--docen-bg);
    border-color: var(--docen-accent);
    color: var(--docen-accent);
}

.docen-icon-item span {
    word-break: break-all;
}
.docen-flash {
    background-color: transparent;
    color: inherit;
    border-radius: 2px;
    padding: 0;
    animation: docenFlashAnim 2.5s ease-out forwards;
}

@keyframes docenFlashAnim {
    0% { background-color: var(--docen-accent); color: #fff; }
    30% { background-color: var(--docen-accent); color: #fff; }
    100% { background-color: transparent; color: inherit; }
}

.docen-sidebar nav ul {
    list-style: none;
}

.docen-sidebar nav a, .docen-sidebar nav .folder-link, .docen-sidebar nav .item-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    color: var(--docen-text);
    text-decoration: none;
    border-radius: var(--docen-radius);
    margin-bottom: 4px;
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.nav-link-content {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-item-icon {
    width: 20px;
    height: 20px;
    opacity: 0.7;
    flex-shrink: 0;
}

.docen-sidebar nav a:hover,
.docen-sidebar nav .folder-link:hover,
.docen-sidebar nav .item-link:hover,
.docen-sidebar nav a.active {
    background-color: rgba(3, 102, 214, 0.1);
    color: var(--docen-accent);
}

.docen-sidebar nav a:hover,
.docen-sidebar nav .folder-link:hover,
.docen-sidebar nav .item-link:hover {
    transform: translateX(2px);
}

.docen-sidebar nav ul ul.folder-children {
    display: none;
    padding-left: 16px; /* Indent nested lists */
    margin-top: 4px;
}

.docen-sidebar nav ul ul.folder-children.open {
    display: block;
}

.folder-icon {
    width: 16px;
    height: 16px;
    opacity: 0.6;
    transition: transform 0.2s ease;
}

.folder-icon.open {
    transform: rotate(90deg);
}

.docen-sidebar-footer {
    margin-top: auto;
    padding-top: var(--docen-spacing);
    border-top: 1px solid var(--docen-sidebar-border);
    display: flex;
    gap: 8px;
    align-items: center;
}

.theme-toggle-btn, .github-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 8px;
    background: transparent;
    border: none;
    color: var(--docen-text);
    border-radius: var(--docen-radius);
    cursor: pointer;
    transition: background 0.2s;
    text-decoration: none;
}

.theme-toggle-btn:hover, .github-btn:hover {
    background: var(--docen-sidebar-border);
}

.theme-toggle-btn svg, .github-btn .github-icon {
    width: 20px;
    height: 20px;
    object-fit: contain;
}

/* GitHub Icon Theme Toggle */
.github-icon-dark {
    display: none;
}

[data-theme="dark"] .github-icon-light {
    display: none;
}

[data-theme="dark"] .github-icon-dark {
    display: block;
}

.docen-content {
    flex-grow: 1;
    width: 100%;
    padding: calc(var(--docen-spacing) * 2) calc(var(--docen-spacing) * 2) calc(var(--docen-spacing) * 2) calc(var(--docen-spacing) * 2 + 24px);
    max-width: 1100px;
    margin: 0 auto 0 12px;
}

#docen-render-area {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 250px;
    gap: 40px;
    align-items: start;
}

#docen-render-area.no-toc {
    display: block;
}

#docen-render-area .docen-page-content {
    grid-column: 1;
    min-width: 0;
}

#docen-render-area .docen-page-content > :first-child {
    margin-top: 0;
}

#docen-render-area .docen-page-toc {
    grid-column: 2;
    position: sticky;
    top: 24px;
    border: 1px solid var(--docen-sidebar-border);
    background: var(--docen-sidebar-bg);
    border-radius: var(--docen-radius);
    padding: 12px 14px;
    margin-bottom: 0;
    max-height: calc(100vh - 48px);
    overflow: auto;
}

#docen-render-area .docen-page-toc-titlebar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

#docen-render-area .docen-page-toc-title {
    font-weight: 600;
    font-size: 0.95rem;
    margin: 0 0 8px 0;
}

#docen-render-area .docen-page-toc-close {
    display: none;
    width: 28px;
    height: 28px;
    border: 1px solid var(--docen-sidebar-border);
    border-radius: var(--docen-radius);
    background: transparent;
    color: var(--docen-text);
    font-size: 20px;
    line-height: 1;
    cursor: pointer;
}

#docen-render-area .docen-page-toc ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

#docen-render-area .docen-page-toc-item {
    margin: 0;
}

#docen-render-area .docen-page-toc-item button {
    width: 100%;
    text-align: left;
    border: none;
    background: transparent;
    color: var(--docen-text);
    padding: 6px 8px;
    border-radius: var(--docen-radius);
    cursor: pointer;
    font: inherit;
}

#docen-render-area .docen-page-toc-item button:hover {
    color: var(--docen-accent);
    background: rgba(3, 102, 214, 0.1);
}

#docen-render-area .docen-page-toc-item button.active {
    color: var(--docen-accent);
    background: rgba(3, 102, 214, 0.14);
}

#docen-render-area .docen-page-toc-item.level-h3 button {
    padding-left: 20px;
    opacity: 0.9;
}

#docen-render-area .docen-section-flash {
    animation: docenSectionFlash 1.8s ease-out;
}

.docen-page-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 32px;
    padding-top: 16px;
    border-top: 1px solid var(--docen-sidebar-border);
}

.docen-page-nav-spacer {
    display: block;
}

.docen-page-nav-link {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 12px;
    border: 1px solid var(--docen-sidebar-border);
    border-radius: var(--docen-radius);
    text-decoration: none;
    color: var(--docen-text);
    transition: border-color 0.2s ease, background-color 0.2s ease;
    min-width: 0;
}

.docen-page-nav-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.docen-page-nav-link.next .docen-page-nav-top {
    justify-content: flex-end;
}

.docen-page-nav-link:hover {
    border-color: var(--docen-accent);
    background-color: rgba(3, 102, 214, 0.08);
    text-decoration: none;
}

.docen-page-nav-link.next {
    text-align: right;
}

.docen-page-nav-label {
    font-size: 0.78rem;
    opacity: 0.7;
}

.docen-page-nav-title {
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.docen-keycap,
.docen-search-shortcut {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 22px;
    height: 20px;
    padding: 0 6px;
    border: 1px solid var(--docen-sidebar-border);
    border-radius: 6px;
    background: var(--docen-sidebar-bg);
    font-family: var(--docen-font-code);
    font-size: 0.72rem;
    line-height: 1;
    color: var(--docen-text);
    opacity: 0.85;
}

.docen-mobile-toc-trigger {
    display: none;
}

.docen-page-toc-backdrop {
    display: none;
}

@keyframes docenSectionFlash {
    0% { background-color: var(--docen-accent); color: #fff; }
    100% { background-color: transparent; color: inherit; }
}

#docen-render-area h1,
#docen-render-area h2,
#docen-render-area h3,
#docen-render-area h4 {
    margin-top: 1.5em;
    margin-bottom: 0.5em;
    font-weight: 600;
}

#docen-render-area h1 { font-size: 2.25rem; border-bottom: 1px solid var(--docen-sidebar-border); padding-bottom: 8px; }
#docen-render-area h2 { font-size: 1.75rem; border-bottom: 1px solid var(--docen-sidebar-border); padding-bottom: 6px; }

#docen-render-area p, #docen-render-area ul, #docen-render-area ol {
    margin-bottom: 1em;
}

#docen-render-area ul, #docen-render-area ol {
    padding-left: 2em;
}

#docen-render-area a {
    color: var(--docen-accent);
    text-decoration: none;
}

#docen-render-area a:hover {
    text-decoration: underline;
}

#docen-render-area code {
    font-family: var(--docen-font-code);
    background-color: var(--docen-sidebar-bg);
    padding: 0.2em 0.4em;
    border-radius: var(--docen-radius);
    font-size: 85%;
}

#docen-render-area pre {
    background-color: var(--docen-sidebar-bg);
    padding: var(--docen-spacing);
    border-radius: var(--docen-radius);
    overflow-x: auto;
    margin-bottom: 1em;
}

#docen-render-area pre code {
    background-color: transparent;
    padding: 0;
}

#docen-render-area blockquote {
    border-left: 4px solid var(--docen-sidebar-border);
    padding-left: 1em;
    color: #6a737d;
    margin: 1em 0;
}

#docen-render-area table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1em;
}

#docen-render-area th, #docen-render-area td {
    border: 1px solid var(--docen-sidebar-border);
    padding: 8px 12px;
}

@media (max-width: 900px) {
    body.sidebar-open {
        overflow: hidden;
    }

    body.sidebar-open .docen-mobile-menu-btn {
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
    }

    .docen-container {
        display: block;
    }

    .docen-sidebar {
        position: fixed;
        top: 0;
        left: 0;
        width: min(320px, 85vw);
        height: 100vh;
        transform: translateX(-100%);
        transition: transform 0.25s ease;
        z-index: 1000;
        border-right: 1px solid var(--docen-sidebar-border);
        overflow-y: auto;
        overflow-x: visible;
    }

    #sidebar-toggle {
        display: inline-flex;
        flex-shrink: 0;
    }

    .docen-sidebar.mobile-open {
        transform: translateX(0);
    }

    .docen-mobile-menu-btn {
        display: inline-flex;
    }

    .docen-content {
        max-width: 100%;
        padding: 72px 16px 24px;
        margin: 0;
    }

    #docen-render-area {
        display: block;
    }

    #docen-render-area .docen-page-toc {
        position: fixed;
        left: 0;
        right: 0;
        bottom: 0;
        top: auto;
        z-index: 1300;
        margin: 0;
        max-height: min(70vh, 520px);
        border-radius: 16px 16px 0 0;
        transform: translateY(100%);
        transition: transform 0.25s ease;
    }

    .docen-page-nav {
        grid-template-columns: 1fr;
    }

    .docen-page-nav-link.next {
        text-align: left;
    }

    .docen-page-nav-link.next .docen-page-nav-top {
        justify-content: flex-start;
    }

    .docen-page-nav-spacer {
        display: none;
    }

    #docen-render-area .docen-page-toc.mobile-open {
        transform: translateY(0);
    }

    #docen-render-area .docen-page-toc-close {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .docen-page-toc-backdrop {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.45);
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.2s ease, visibility 0.2s ease;
        z-index: 1200;
    }

    .docen-page-toc-backdrop.active {
        opacity: 1;
        visibility: visible;
    }

    .docen-mobile-toc-trigger {
        display: inline-flex;
        position: fixed;
        right: 16px;
        bottom: 16px;
        z-index: 1100;
        padding: 10px 14px;
        border-radius: 999px;
        border: 1px solid var(--docen-sidebar-border);
        background: var(--docen-bg);
        color: var(--docen-text);
        font: inherit;
        cursor: pointer;
    }

    body.sidebar-open .docen-mobile-toc-trigger,
    body.toc-modal-open .docen-mobile-toc-trigger {
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
    }

    body.toc-modal-open {
        overflow: hidden;
    }
}