*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --fg: #24292f;
    --bg: #ffffff;
    --sidebar-bg: #f6f8fa;
    --sidebar-border: #d0d7de;
    --link: #0969da;
    --link-hover: #0550ae;
    --code-bg: #f6f8fa;
    --code-border: #d8dee4;
    --table-border: #d0d7de;
    --table-header-bg: #f6f8fa;
    --table-stripe: #f6f8fa;
    --hr: #d0d7de;
    --muted: #57606a;
    --hover-bg: rgba(9, 105, 218, 0.06);
}

/* ---- Themes ---- */

[data-theme="dark"] {
    --fg: #c9d1d9;
    --bg: #0d1117;
    --sidebar-bg: #161b22;
    --sidebar-border: #30363d;
    --link: #58a6ff;
    --link-hover: #79c0ff;
    --code-bg: #161b22;
    --code-border: #30363d;
    --table-border: #30363d;
    --table-header-bg: #161b22;
    --table-stripe: #161b22;
    --hr: #21262d;
    --muted: #8b949e;
    --hover-bg: rgba(88, 166, 255, 0.1);
}

[data-theme="monokai"] {
    --fg: #f8f8f2;
    --bg: #272822;
    --sidebar-bg: #1e1f1c;
    --sidebar-border: #3e3d32;
    --link: #a6e22e;
    --link-hover: #e6db74;
    --code-bg: #1e1f1c;
    --code-border: #3e3d32;
    --table-border: #3e3d32;
    --table-header-bg: #1e1f1c;
    --table-stripe: #2d2e27;
    --hr: #3e3d32;
    --muted: #a59f85;
    --hover-bg: rgba(166, 226, 46, 0.08);
}

[data-theme="solarized-light"] {
    --fg: #657b83;
    --bg: #fdf6e3;
    --sidebar-bg: #eee8d5;
    --sidebar-border: #d3cbb7;
    --link: #268bd2;
    --link-hover: #2aa198;
    --code-bg: #eee8d5;
    --code-border: #d3cbb7;
    --table-border: #d3cbb7;
    --table-header-bg: #eee8d5;
    --table-stripe: #eee8d5;
    --hr: #d3cbb7;
    --muted: #93a1a1;
    --hover-bg: rgba(38, 139, 210, 0.08);
}

[data-theme="solarized-dark"] {
    --fg: #839496;
    --bg: #002b36;
    --sidebar-bg: #073642;
    --sidebar-border: #586e75;
    --link: #268bd2;
    --link-hover: #2aa198;
    --code-bg: #073642;
    --code-border: #586e75;
    --table-border: #586e75;
    --table-header-bg: #073642;
    --table-stripe: #073642;
    --hr: #586e75;
    --muted: #657b83;
    --hover-bg: rgba(38, 139, 210, 0.12);
}

[data-theme="solarflare"] {
    --fg: #a6afb8;
    --bg: #18262f;
    --sidebar-bg: #222e38;
    --sidebar-border: #586875;
    --link: #eb7b4b;
    --link-hover: #e66b2b;
    --code-bg: #222e38;
    --code-border: #586875;
    --table-border: #586875;
    --table-header-bg: #222e38;
    --table-stripe: #1d2b35;
    --hr: #586875;
    --muted: #85939e;
    --hover-bg: rgba(235, 123, 75, 0.1);
}

[data-theme="nord"] {
    --fg: #d8dee9;
    --bg: #2e3440;
    --sidebar-bg: #3b4252;
    --sidebar-border: #4c566a;
    --link: #88c0d0;
    --link-hover: #8fbcbb;
    --code-bg: #3b4252;
    --code-border: #4c566a;
    --table-border: #4c566a;
    --table-header-bg: #3b4252;
    --table-stripe: #3b4252;
    --hr: #4c566a;
    --muted: #81a1c1;
    --hover-bg: rgba(136, 192, 208, 0.1);
}

[data-theme="dracula"] {
    --fg: #f8f8f2;
    --bg: #282a36;
    --sidebar-bg: #21222c;
    --sidebar-border: #44475a;
    --link: #bd93f9;
    --link-hover: #ff79c6;
    --code-bg: #21222c;
    --code-border: #44475a;
    --table-border: #44475a;
    --table-header-bg: #21222c;
    --table-stripe: #2d2f3b;
    --hr: #44475a;
    --muted: #6272a4;
    --hover-bg: rgba(189, 147, 249, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--fg);
    background: var(--bg);
}

/* ---- Layout ---- */

.layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    max-width: 1400px;
    margin: 0 auto;
    min-height: 100vh;
}

.layout-with-toc {
    grid-template-columns: 280px 1fr 260px;
    max-width: 1460px;
}

/* ---- Sidebar ---- */

.sidebar {
    background: var(--sidebar-bg);
    border-right: 1px solid var(--sidebar-border);
    padding: 1.5rem 1rem;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--sidebar-border);
}

.sidebar-title {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--fg);
    text-decoration: none;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
}

.sidebar-filter {
    display: block;
    width: calc(100% - 1.6rem);
    margin: 0.5rem 0.8rem;
    padding: 0.35rem 0.5rem;
    font-size: 0.85rem;
    border: 1px solid var(--sidebar-border);
    border-radius: 4px;
    background: var(--bg);
    color: var(--fg);
}
.sidebar-filter::placeholder { color: var(--muted); }
.sidebar-filter:focus {
    outline: none;
    border-color: var(--link);
}

/* ---- Theme picker ---- */

.theme-picker {
    margin-top: auto;
    padding-top: 0.75rem;
    border-top: 1px solid var(--sidebar-border);
}

.theme-picker label {
    font-size: 0.8rem;
    color: var(--muted);
    display: block;
    margin-bottom: 0.3rem;
}

.theme-select {
    width: 100%;
    padding: 0.3rem 0.4rem;
    font-size: 0.8rem;
    border: 1px solid var(--sidebar-border);
    border-radius: 4px;
    background: var(--bg);
    color: var(--fg);
    cursor: pointer;
}

/* ---- Right sidebar TOC (document pages) ---- */

.toc-sidebar {
    background: var(--sidebar-bg);
    border-left: 1px solid var(--sidebar-border);
    padding: 1.5rem 1rem;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.toc-sidebar-header {
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--sidebar-border);
}

.toc {
    list-style: none;
}

.toc li {
    margin: 0.15rem 0;
}

.toc a {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.84rem;
    display: block;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    line-height: 1.4;
}

.toc a:hover {
    color: var(--link);
    background: var(--hover-bg);
}

.toc-h3 {
    padding-left: 1rem;
}

/* ---- Sidebar tree (index pages) ---- */

.tree {
    list-style: none;
    padding-left: 0;
}

.tree ul {
    list-style: none;
    padding-left: 1rem;
}

.tree-dir > details > summary {
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--fg);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    line-height: 1.4;
    list-style: none;
}

.tree-dir > details > summary::-webkit-details-marker {
    display: none;
}

.tree-dir > details > summary::before {
    content: "\25b6";
    display: inline-block;
    width: 1em;
    font-size: 0.7em;
    transition: transform 0.15s ease;
}

.tree-dir > details[open] > summary::before {
    transform: rotate(90deg);
}

.tree-dir > details > summary:hover {
    background: var(--hover-bg);
}

.tree-file {
    margin: 0.1rem 0;
}

.tree-file > a {
    color: var(--fg);
    text-decoration: none;
    font-size: 0.84rem;
    display: block;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    line-height: 1.4;
}

.tree-file > a:hover {
    color: var(--link);
    background: var(--hover-bg);
}

/* ---- Sidebar: sparse/completed items ---- */

.tree-file-sparse > a {
    color: var(--muted);
    font-style: italic;
    opacity: 0.7;
}

.tree-file-completed > a {
    color: var(--muted);
    opacity: 0.5;
    text-decoration: line-through;
    text-decoration-color: var(--muted);
}

.tree-file-completed > a:hover {
    opacity: 0.8;
    text-decoration: line-through;
    text-decoration-color: var(--link);
}

.tree-file-sparse.tree-file-completed > a {
    opacity: 0.4;
}

.tree-file-aged,
.tree-dir-aged {
    display: none;
}

/* ---- Age filter ---- */

.age-filter {
    padding-top: 0.75rem;
    border-top: 1px solid var(--sidebar-border);
}

.age-filter label {
    font-size: 0.8rem;
    color: var(--muted);
    display: block;
    margin-bottom: 0.3rem;
}

.age-select {
    width: 100%;
    padding: 0.3rem 0.4rem;
    font-size: 0.8rem;
    border: 1px solid var(--sidebar-border);
    border-radius: 4px;
    background: var(--bg);
    color: var(--fg);
    cursor: pointer;
}

/* ---- Content ---- */

.content {
    max-width: 920px;
    padding: 2.5rem 3rem;
    min-width: 0;
}

article h1 {
    font-size: 2rem;
    margin-bottom: 0.75rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid var(--hr);
}

article h2 {
    font-size: 1.5rem;
    margin-top: 2.5rem;
    margin-bottom: 0.75rem;
    padding-bottom: 0.35rem;
    border-bottom: 1px solid var(--hr);
}

article h3 {
    font-size: 1.25rem;
    margin-top: 1.75rem;
    margin-bottom: 0.5rem;
}

article h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-top: 1.25rem;
    margin-bottom: 0.5rem;
}

article p {
    margin-bottom: 1rem;
}

/* ---- Foldable sections ---- */

.section-fold {
    margin-top: 2rem;
    border: none;
}

.section-fold-summary {
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-weight: 700;
    color: var(--fg);
}

.section-fold-summary::-webkit-details-marker {
    display: none;
}

.section-fold-summary::before {
    content: "\25B6";
    display: inline-block;
    font-size: 0.55em;
    transition: transform 0.2s;
    color: var(--muted);
    flex-shrink: 0;
}

details.section-fold[open] > .section-fold-summary::before {
    transform: rotate(90deg);
}

.section-fold-h2 {
    font-size: 1.5rem;
    padding-bottom: 0.35rem;
    border-bottom: 1px solid var(--hr);
    margin-bottom: 0.75rem;
}

.section-fold-h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.section-fold-completed > .section-fold-summary {
    color: var(--muted);
}

.section-fold-completed > .section-fold-summary::before {
    color: var(--badge-completed-fg, var(--muted));
}

/* ---- Fold toolbar ---- */

/* ---- Unified content toolbar ---- */

.content-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem;
    min-height: 0;
}

.content-toolbar:empty {
    display: none;
}

#content-toolbar-top {
    margin-bottom: 0.75rem;
}

#content-toolbar-bottom {
    margin-top: 1.5rem;
}

/* ---- Shared toolbar button ---- */

.toolbar-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
    padding: 0.3rem 0.7rem;
    font-size: 0.75rem;
    font-weight: 500;
    line-height: 1.4;
    border: 1.5px solid var(--toolbar-btn-border, var(--muted));
    border-radius: 999px;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.15s, color 0.15s, border-color 0.15s, box-shadow 0.15s;
}

.toolbar-btn:hover {
    background: var(--toolbar-btn-hover-bg, var(--border));
    color: var(--fg);
    border-color: var(--fg);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.toolbar-btn:active {
    transform: scale(0.97);
}

.toolbar-btn-icon {
    width: 1.7rem;
    height: 1.7rem;
    padding: 0;
    font-size: 0.95rem;
    border-radius: 50%;
}

article a {
    color: var(--link);
    text-decoration: none;
}

article a:hover {
    text-decoration: underline;
    color: var(--link-hover);
}

article ul, article ol {
    margin-bottom: 1rem;
    padding-left: 2rem;
}

article li {
    margin-bottom: 0.25rem;
}

article li > ul, article li > ol {
    margin-top: 0.25rem;
    margin-bottom: 0;
}

/* ---- Code ---- */

article code {
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.875em;
    background: var(--code-bg);
    padding: 0.2em 0.4em;
    border-radius: 4px;
}

article pre {
    background: var(--code-bg);
    border: 1px solid var(--code-border);
    border-radius: 6px;
    padding: 1rem;
    overflow-x: auto;
    margin-bottom: 1rem;
    line-height: 1.5;
}

article pre code {
    background: none;
    padding: 0;
    font-size: 0.85em;
    border-radius: 0;
}

/* ---- Tables ---- */

article table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    display: block;
    overflow-x: auto;
}

article th {
    background: var(--table-header-bg);
    font-weight: 600;
    text-align: left;
}

article th, article td {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--table-border);
    white-space: nowrap;
}

article tr:nth-child(even) {
    background: var(--table-stripe);
}

/* ---- Misc ---- */

article hr {
    border: none;
    border-top: 2px solid var(--hr);
    margin: 2.5rem 0;
}

article blockquote {
    border-left: 4px solid var(--sidebar-border);
    padding: 0.5rem 1rem;
    margin: 0 0 1rem;
    color: var(--muted);
}

article strong {
    font-weight: 600;
}

/* ---- Index page ---- */

.index-controls {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.index-intro {
    color: var(--muted);
    font-size: 1.05rem;
}

.sort-controls {
    font-size: 0.85rem;
    color: var(--muted);
}

.sort-btn {
    background: none;
    border: 1px solid var(--sidebar-border);
    border-radius: 4px;
    padding: 0.2rem 0.5rem;
    font-size: 0.8rem;
    color: var(--muted);
    cursor: pointer;
    margin-left: 0.25rem;
}

.sort-btn:hover {
    color: var(--link);
    border-color: var(--link);
}

.sort-btn.sort-active {
    background: var(--link);
    color: var(--bg);
    border-color: var(--link);
}

.page-list {
    list-style: none;
    padding: 0;
}

.page-list li {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--hr);
}

.page-list li:first-child {
    border-top: 1px solid var(--hr);
}

.page-list a {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--link);
    text-decoration: none;
}

.page-list a:hover {
    text-decoration: underline;
    color: var(--link-hover);
}

.page-meta {
    font-size: 0.85rem;
    color: var(--muted);
    white-space: nowrap;
}

/* ---- Page meta header (frontmatter badges) ---- */

:root {
    --badge-session-bg: rgba(9, 105, 218, 0.12);
    --badge-session-fg: #0550ae;
    --badge-completed-bg: rgba(26, 127, 55, 0.12);
    --badge-completed-fg: #1a7f37;
    --badge-updated-bg: rgba(130, 80, 223, 0.10);
    --badge-updated-fg: #6639ba;
    --badge-file-bg: rgba(87, 96, 106, 0.08);
    --badge-file-fg: var(--muted);
    --badge-dir-bg: rgba(191, 135, 0, 0.10);
    --badge-dir-fg: #9a6700;
    --toolbar-btn-border: #b0b8c1;
    --toolbar-btn-hover-bg: #f0f2f5;
}

[data-theme="dark"] {
    --badge-session-bg: rgba(88, 166, 255, 0.15);
    --badge-session-fg: #79c0ff;
    --badge-completed-bg: rgba(63, 185, 80, 0.15);
    --badge-completed-fg: #56d364;
    --badge-updated-bg: rgba(188, 140, 255, 0.15);
    --badge-updated-fg: #d2a8ff;
    --badge-file-bg: rgba(139, 148, 158, 0.12);
    --badge-file-fg: #8b949e;
    --badge-dir-bg: rgba(210, 153, 34, 0.15);
    --badge-dir-fg: #e3b341;
    --toolbar-btn-border: #6e7681;
    --toolbar-btn-hover-bg: #30363d;
}

[data-theme="monokai"] {
    --badge-session-bg: rgba(166, 226, 46, 0.15);
    --badge-session-fg: #a6e22e;
    --badge-completed-bg: rgba(166, 226, 46, 0.12);
    --badge-completed-fg: #a6e22e;
    --badge-updated-bg: rgba(174, 129, 255, 0.15);
    --badge-updated-fg: #ae81ff;
    --badge-file-bg: rgba(165, 159, 133, 0.12);
    --badge-file-fg: #a59f85;
    --badge-dir-bg: rgba(230, 219, 116, 0.15);
    --badge-dir-fg: #e6db74;
    --toolbar-btn-border: #75715e;
    --toolbar-btn-hover-bg: #3e3d32;
}

[data-theme="dracula"] {
    --badge-session-bg: rgba(189, 147, 249, 0.15);
    --badge-session-fg: #bd93f9;
    --badge-completed-bg: rgba(80, 250, 123, 0.15);
    --badge-completed-fg: #50fa7b;
    --badge-updated-bg: rgba(255, 121, 198, 0.15);
    --badge-updated-fg: #ff79c6;
    --badge-file-bg: rgba(98, 114, 164, 0.15);
    --badge-file-fg: #6272a4;
    --badge-dir-bg: rgba(241, 250, 140, 0.12);
    --badge-dir-fg: #f1fa8c;
    --toolbar-btn-border: #6272a4;
    --toolbar-btn-hover-bg: #383a59;
}

[data-theme="nord"] {
    --badge-session-bg: rgba(136, 192, 208, 0.15);
    --badge-session-fg: #88c0d0;
    --badge-completed-bg: rgba(163, 190, 140, 0.15);
    --badge-completed-fg: #a3be8c;
    --badge-updated-bg: rgba(180, 142, 173, 0.15);
    --badge-updated-fg: #b48ead;
    --badge-file-bg: rgba(76, 86, 106, 0.2);
    --badge-file-fg: #81a1c1;
    --badge-dir-bg: rgba(235, 203, 139, 0.15);
    --badge-dir-fg: #ebcb8b;
    --toolbar-btn-border: #5e81ac;
    --toolbar-btn-hover-bg: #3b4252;
}

[data-theme="solarized-light"] {
    --badge-session-bg: rgba(38, 139, 210, 0.12);
    --badge-session-fg: #268bd2;
    --badge-completed-bg: rgba(133, 153, 0, 0.12);
    --badge-completed-fg: #859900;
    --badge-updated-bg: rgba(108, 113, 196, 0.12);
    --badge-updated-fg: #6c71c4;
    --badge-file-bg: rgba(147, 161, 161, 0.12);
    --badge-file-fg: #93a1a1;
    --badge-dir-bg: rgba(181, 137, 0, 0.12);
    --badge-dir-fg: #b58900;
    --toolbar-btn-border: #93a1a1;
    --toolbar-btn-hover-bg: #eee8d5;
}

[data-theme="solarized-dark"] {
    --badge-session-bg: rgba(38, 139, 210, 0.2);
    --badge-session-fg: #268bd2;
    --badge-completed-bg: rgba(133, 153, 0, 0.2);
    --badge-completed-fg: #859900;
    --badge-updated-bg: rgba(108, 113, 196, 0.2);
    --badge-updated-fg: #6c71c4;
    --badge-file-bg: rgba(88, 110, 117, 0.2);
    --badge-file-fg: #657b83;
    --badge-dir-bg: rgba(181, 137, 0, 0.2);
    --badge-dir-fg: #b58900;
    --toolbar-btn-border: #586e75;
    --toolbar-btn-hover-bg: #073642;
}

[data-theme="solarflare"] {
    --badge-session-bg: rgba(235, 123, 75, 0.15);
    --badge-session-fg: #eb7b4b;
    --badge-completed-bg: rgba(124, 195, 104, 0.15);
    --badge-completed-fg: #7cc368;
    --badge-updated-bg: rgba(163, 148, 224, 0.15);
    --badge-updated-fg: #a394e0;
    --badge-file-bg: rgba(133, 147, 158, 0.15);
    --badge-file-fg: #85939e;
    --badge-dir-bg: rgba(231, 197, 71, 0.15);
    --badge-dir-fg: #e7c547;
    --toolbar-btn-border: #85939e;
    --toolbar-btn-hover-bg: #333840;
}

.page-meta-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem;
    margin-bottom: 1.25rem;
}

.badge {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.2rem 0.6rem;
    font-size: 0.75rem;
    font-weight: 500;
    line-height: 1.4;
    border-radius: 999px;
    max-width: 100%;
    white-space: nowrap;
}

.badge-session {
    background: var(--badge-session-bg);
    color: var(--badge-session-fg);
    font-weight: 600;
    font-size: 0.8rem;
    padding: 0.25rem 0.75rem;
}

.badge-completed {
    background: var(--badge-completed-bg);
    color: var(--badge-completed-fg);
}

.badge-updated {
    background: var(--badge-updated-bg);
    color: var(--badge-updated-fg);
}

.badge-muted {
    background: var(--badge-file-bg);
    color: var(--badge-file-fg);
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.7rem;
}

.badge-dir {
    background: var(--badge-dir-bg);
    color: var(--badge-dir-fg);
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.7rem;
}

.badge-copy {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.2rem;
    height: 1.2rem;
    padding: 0;
    margin: 0 -0.15rem 0 0;
    border: none;
    background: transparent;
    color: inherit;
    cursor: pointer;
    border-radius: 3px;
    opacity: 0;
    transition: opacity 0.15s;
    flex-shrink: 0;
}

.badge-copy-svg {
    display: block;
}

.badge:hover .badge-copy {
    opacity: 0.5;
}

.badge-copy:hover {
    opacity: 1 !important;
    background: rgba(128, 128, 128, 0.2);
}

.badge-copy:active {
    transform: scale(0.9);
}

.badge-copy-toast {
    position: absolute;
    top: -1.5rem;
    right: 0;
    background: var(--fg);
    color: var(--bg);
    font-size: 0.65rem;
    font-weight: 600;
    padding: 0.15rem 0.45rem;
    border-radius: 4px;
    white-space: nowrap;
    pointer-events: none;
    z-index: 100;
    animation: badge-toast-fade 1.2s ease-out forwards;
}

@keyframes badge-toast-fade {
    0% { opacity: 1; transform: translateY(0); }
    70% { opacity: 1; transform: translateY(-0.25rem); }
    100% { opacity: 0; transform: translateY(-0.5rem); }
}

/* ---- Live-change toast ---- */

.live-toast {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.6rem 0.75rem;
    background: var(--sidebar-bg, var(--bg));
    color: var(--fg);
    border: 1.5px solid var(--border);
    border-radius: 0.5rem;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    font-size: 0.8rem;
    z-index: 1000;
    opacity: 0;
    transform: translateY(0.75rem);
    transition: opacity 0.3s, transform 0.3s;
    pointer-events: auto;
}

.live-toast-visible {
    opacity: 1;
    transform: translateY(0);
}

.live-toast-dot {
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: var(--badge-updated-fg, #cf7b2a);
    flex-shrink: 0;
    animation: live-dot-pulse 2s ease-in-out infinite;
}

@keyframes live-dot-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.live-toast-msg {
    white-space: nowrap;
}

.live-toast-reload {
    padding: 0.25rem 0.6rem;
    border: 1.5px solid var(--badge-updated-fg, #cf7b2a);
    border-radius: 999px;
    background: transparent;
    color: var(--badge-updated-fg, #cf7b2a);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.15s, color 0.15s;
}

.live-toast-reload:hover {
    background: var(--badge-updated-fg, #cf7b2a);
    color: var(--bg);
}

.live-toast-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 1.3rem;
    height: 1.3rem;
    padding: 0;
    border: none;
    border-radius: 50%;
    background: transparent;
    color: var(--muted);
    font-size: 1rem;
    line-height: 1;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}

.live-toast-close:hover {
    background: var(--border);
    color: var(--fg);
}

/* ---- Editor controls ---- */

.completed-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    user-select: none;
    padding: 0.25rem 0.65rem 0.25rem 0.35rem;
    border-radius: 999px;
    border: 1.5px solid var(--toolbar-btn-border, var(--muted));
    background: var(--bg);
    transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
}

.completed-toggle:hover {
    border-color: var(--fg);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.completed-toggle-on {
    border-color: var(--badge-completed-fg);
    background: var(--badge-completed-bg);
}

.completed-toggle input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

.completed-toggle-track {
    position: relative;
    display: inline-block;
    width: 2rem;
    height: 1.1rem;
    border-radius: 999px;
    background: var(--border);
    transition: background 0.25s;
    flex-shrink: 0;
}

.completed-toggle-on .completed-toggle-track {
    background: var(--badge-completed-fg);
}

.completed-toggle-thumb {
    position: absolute;
    top: 0.15rem;
    left: 0.15rem;
    width: 0.8rem;
    height: 0.8rem;
    border-radius: 50%;
    background: var(--bg);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.completed-toggle-on .completed-toggle-thumb {
    transform: translateX(0.9rem);
}

.completed-toggle-label {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--muted);
    transition: color 0.2s;
    white-space: nowrap;
}

.completed-toggle-on .completed-toggle-label {
    color: var(--badge-completed-fg);
    font-weight: 600;
}

.toolbar-btn-save {
    background: var(--link);
    color: var(--bg);
    border-color: var(--link);
}

.toolbar-btn-save:hover {
    background: var(--link);
    opacity: 0.9;
    color: var(--bg);
    border-color: var(--link);
}

.toolbar-btn-save:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.editor-toolbar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.editor-hint {
    font-size: 0.75rem;
    color: var(--muted);
    margin-left: 0.5rem;
}

#editor-container {
    min-height: 400px;
}

.editor-textarea {
    width: 100%;
    height: calc(100vh - 160px);
    min-height: 400px;
    font-family: "SFMono-Regular", "Consolas", "Liberation Mono", "Menlo", monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    padding: 1rem;
    border: 1px solid var(--sidebar-border);
    border-radius: 6px;
    background: var(--bg);
    color: var(--fg);
    resize: vertical;
    tab-size: 4;
}

/* ---- Footer ---- */

.site-footer {
    text-align: center;
    padding: 1.5rem 1rem;
    font-size: 0.85rem;
    color: var(--muted);
    border-top: 1px solid var(--sidebar-border);
}

.site-footer a {
    color: var(--link);
    text-decoration: none;
}

.site-footer a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

.footer-sep {
    margin: 0 0.5rem;
}

.footer-version {
    font-family: "SFMono-Regular", "Consolas", "Liberation Mono", "Menlo", monospace;
    font-size: 0.8em;
}

/* ---- Responsive: tablet (<=1024px) ---- */

@media (max-width: 1024px) {
    .layout {
        grid-template-columns: 240px 1fr;
    }

    .layout-with-toc {
        grid-template-columns: 240px 1fr;
    }

    .toc-sidebar {
        display: none;
    }

    .content {
        padding: 2rem;
    }
}

/* ---- Responsive: mobile (<=768px) ---- */

@media (max-width: 768px) {
    .layout, .layout-with-toc {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--sidebar-border);
        padding: 1rem;
    }

    .toc-sidebar {
        display: none;
    }

    .content {
        padding: 1.25rem 1rem;
    }

    article h1 {
        font-size: 1.5rem;
    }

    article h2 {
        font-size: 1.25rem;
    }

    article h3 {
        font-size: 1.1rem;
    }

    article pre {
        padding: 0.75rem;
        font-size: 0.85rem;
    }

    article th, article td {
        padding: 0.4rem 0.5rem;
        font-size: 0.8rem;
    }

    .page-list li {
        flex-direction: column;
        gap: 0.2rem;
    }

    .page-meta {
        font-size: 0.8rem;
    }
}

/* ---- Responsive: small mobile (<=480px) ---- */

@media (max-width: 480px) {
    .content {
        padding: 1rem 0.75rem;
    }

    article h1 {
        font-size: 1.3rem;
    }

    .page-list a {
        font-size: 1rem;
    }
}