/* blog — cleaner terminal reading layout
 * Width comes from site .wrap only (same as home/cves/contact).
 */

/* ---------- custom scrollbars (thin, accent, minimal) ----------
 * Applies to page + ToC + code + tables on blog only (blog.css not on home).
 */
html {
    scrollbar-width: thin;
    scrollbar-color: color-mix(in srgb, var(--accent) 45%, var(--dim)) var(--bg);
}

html::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

html::-webkit-scrollbar-track {
    background: var(--bg);
}

html::-webkit-scrollbar-thumb {
    background: color-mix(in srgb, var(--accent) 40%, var(--dim));
    border-radius: 999px;
    border: 2px solid var(--bg);
    background-clip: padding-box;
}

html::-webkit-scrollbar-thumb:hover {
    background: color-mix(in srgb, var(--accent) 75%, var(--dim));
    border: 2px solid var(--bg);
    background-clip: padding-box;
}

html::-webkit-scrollbar-corner {
    background: var(--bg);
}

.toc-panel,
.toc-body,
.post-content table,
.post-content pre,
.post-content .codehilite,
.code-block pre,
.code-block .codehilite {
    scrollbar-width: thin;
    scrollbar-color: color-mix(in srgb, var(--accent) 40%, var(--dim)) transparent;
}

.toc-panel::-webkit-scrollbar,
.toc-body::-webkit-scrollbar,
.post-content table::-webkit-scrollbar,
.post-content pre::-webkit-scrollbar,
.post-content .codehilite::-webkit-scrollbar,
.code-block pre::-webkit-scrollbar,
.code-block .codehilite::-webkit-scrollbar {
    width: 7px;
    height: 7px;
}

.toc-panel::-webkit-scrollbar-track,
.toc-body::-webkit-scrollbar-track,
.post-content table::-webkit-scrollbar-track,
.post-content pre::-webkit-scrollbar-track,
.post-content .codehilite::-webkit-scrollbar-track,
.code-block pre::-webkit-scrollbar-track,
.code-block .codehilite::-webkit-scrollbar-track {
    background: transparent;
}

.toc-panel::-webkit-scrollbar-thumb,
.toc-body::-webkit-scrollbar-thumb,
.post-content table::-webkit-scrollbar-thumb,
.post-content pre::-webkit-scrollbar-thumb,
.post-content .codehilite::-webkit-scrollbar-thumb,
.code-block pre::-webkit-scrollbar-thumb,
.code-block .codehilite::-webkit-scrollbar-thumb {
    background: color-mix(in srgb, var(--accent) 38%, var(--dim));
    border-radius: 999px;
    border: 2px solid transparent;
    background-clip: padding-box;
}

.toc-panel::-webkit-scrollbar-thumb:hover,
.toc-body::-webkit-scrollbar-thumb:hover,
.post-content table::-webkit-scrollbar-thumb:hover,
.post-content pre::-webkit-scrollbar-thumb:hover,
.post-content .codehilite::-webkit-scrollbar-thumb:hover,
.code-block pre::-webkit-scrollbar-thumb:hover,
.code-block .codehilite::-webkit-scrollbar-thumb:hover {
    background: color-mix(in srgb, var(--accent) 72%, var(--dim));
    border: 2px solid transparent;
    background-clip: padding-box;
}

.toc-panel::-webkit-scrollbar-corner,
.post-content pre::-webkit-scrollbar-corner,
.code-block pre::-webkit-scrollbar-corner,
.code-block .codehilite::-webkit-scrollbar-corner {
    background: transparent;
}

/* reading progress — above sticky nav */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    z-index: 120;
    background: transparent;
    pointer-events: none;
}

.reading-progress-bar {
    height: 100%;
    width: 0%;
    background: var(--accent);
    box-shadow: 0 0 8px color-mix(in srgb, var(--accent) 50%, transparent);
    transition: width 0.08s linear;
}

.back {
    margin-bottom: 1.1rem;
    font-size: 0.9rem;
}

.blog-head {
    margin-bottom: 0.25rem;
}

.blog-count {
    color: var(--dim);
    font-size: 0.85rem;
    margin: 0.35rem 0 1rem;
    font-variant-numeric: tabular-nums;
}

.blog-pages {
    margin: 0.25rem 0 1.25rem;
    color: var(--mute);
    font-size: 0.9rem;
}

.blog-pages a {
    color: var(--accent);
}

/* ---------- index list ---------- */

.post-list {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--line);
    background: var(--soft);
    border-radius: 2px;
    overflow: hidden;
}

.post-item {
    display: grid;
    grid-template-columns: 6.75rem 1fr;
    gap: 0.75rem 1.1rem;
    padding: 1rem 1.1rem;
    border-bottom: 1px solid var(--line);
    align-items: start;
    transition: background 0.15s;
}

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

.post-item:hover {
    background: color-mix(in srgb, var(--accent) 8%, transparent);
}

.post-date {
    color: var(--dim);
    font-size: 0.82rem;
    font-variant-numeric: tabular-nums;
    padding-top: 0.2rem;
    white-space: nowrap;
}

.post-body {
    min-width: 0;
}

.post-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--bright);
    margin: 0;
    line-height: 1.4;
}

.post-title a {
    color: var(--bright);
    text-decoration: none;
}

.post-title a:hover {
    color: var(--accent);
}

.post-excerpt {
    margin-top: 0.35rem;
    color: var(--mute);
    font-size: 0.88rem;
    line-height: 1.55;
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-top: 0.5rem;
}

.tag-pill {
    font-size: 0.72rem;
    color: var(--dim);
    border: 1px solid var(--line);
    padding: 0.1rem 0.45rem;
    border-radius: 999px;
    background: var(--bg);
}

/* ---------- post header ---------- */

.post-header {
    margin-bottom: 1.1rem;
}

.post-hero h1 {
    font-size: clamp(1.35rem, 2.8vw, 1.7rem);
    line-height: 1.25;
    margin: 0 0 0.55rem;
    color: var(--bright);
    letter-spacing: -0.03em;
}

.post-meta-line {
    color: var(--dim);
    font-size: 0.88rem;
    margin: 0 0 0.7rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem 0.45rem;
    align-items: center;
    font-variant-numeric: tabular-nums;
}

.post-meta-line .dot {
    color: var(--line);
}

.post-featured {
    margin: 0.25rem 0 1.5rem;
    text-align: center;
    max-width: 100%;
    min-width: 0;
    overflow: hidden;
}

.post-featured img {
    max-width: 100%;
    width: auto;
    height: auto;
    border: 1px solid var(--line);
    border-radius: 2px;
    display: inline-block;
    margin: 0 auto;
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.28);
    cursor: zoom-in;
}

/* ---------- layout: ToC + content ---------- */

.post-layout {
    display: block;
    min-width: 0;
    max-width: 100%;
}

.post-layout.has-toc {
    display: grid;
    grid-template-columns: minmax(12rem, 15rem) minmax(0, 1fr);
    gap: 1.75rem;
    align-items: start;
}

.toc-panel {
    position: sticky;
    /* sit just under fixed site nav */
    top: calc(var(--nav-h, 3.5rem) + 0.65rem);
    border: 1px solid var(--line);
    background: var(--soft);
    border-radius: 4px;
    padding: 0.55rem 0.75rem 0.65rem;
    max-height: calc(100vh - var(--nav-h, 3.5rem) - 1.25rem);
    max-height: calc(100dvh - var(--nav-h, 3.5rem) - 1.25rem);
    overflow: auto;
    z-index: 5;
}

.toc-toggle {
    appearance: none;
    width: 100%;
    border: 0;
    background: transparent;
    color: var(--accent);
    font: inherit;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding: 0.25rem 0;
    text-align: left;
}

.toc-toggle:hover {
    color: var(--fg);
}

.toc-toggle:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 2px;
}

.toc-chevron {
    width: 0.55rem;
    height: 0.55rem;
    border-right: 1.5px solid var(--dim);
    border-bottom: 1.5px solid var(--dim);
    transform: rotate(-45deg); /* points right when closed */
    transition: transform 0.28s ease;
    flex-shrink: 0;
    margin-right: 0.15rem;
}

.toc-panel.is-open .toc-chevron {
    transform: rotate(45deg); /* points down when open */
}

/* animated height: grid 0fr → 1fr */
.toc-collapse {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.32s ease;
}

.toc-panel.is-open .toc-collapse {
    grid-template-rows: 1fr;
}

.toc-collapse-inner {
    overflow: hidden;
    min-height: 0;
}

.toc-panel.is-open .toc-collapse-inner {
    padding-top: 0.45rem;
}

.toc-title-text {
    color: inherit;
}

.toc-body .toc {
    font-size: 0.82rem;
    line-height: 1.45;
}

.toc-body .toc ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.toc-body .toc ul ul {
    padding-left: 0.75rem;
    margin-top: 0.2rem;
    border-left: 1px solid var(--line);
}

.toc-body .toc li {
    margin: 0.28rem 0;
}

.toc-body .toc a {
    color: var(--mute);
    text-decoration: none;
    display: block;
    padding: 0.15rem 0.35rem;
    border-radius: 2px;
    border-left: 2px solid transparent;
    margin-left: -2px;
    transition: color 0.15s, background 0.15s, border-color 0.15s;
}

.toc-body .toc a:hover {
    color: var(--accent);
    background: color-mix(in srgb, var(--accent) 8%, transparent);
}

.toc-body .toc a.is-active {
    color: var(--accent);
    border-left-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 10%, transparent);
    font-weight: 600;
}

.post-main {
    min-width: 0;
    max-width: 100%;
    overflow-x: clip;
}

/* ---------- markdown body ---------- */

.post-content {
    color: var(--fg);
    /* comfortable reading size; full column width (site frame stays same) */
    font-size: 1.02rem;
    line-height: 1.8;
    max-width: 100%;
    min-width: 0;
    overflow-x: clip;
    overflow-wrap: break-word;
    word-break: break-word;
    border-top: 1px solid var(--line);
    padding-top: 1.35rem;
    letter-spacing: 0.005em;
}

.post-content > *:first-child {
    margin-top: 0;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4 {
    color: var(--bright);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 2rem 0 0.75rem;
    line-height: 1.3;
    /* offset comes from html scroll-padding-top: var(--nav-h) — do not also set
       scroll-margin here or the fixed-nav clearance doubles */
    position: relative;
}

.post-content h2 {
    font-size: 1.18rem;
    border-bottom: 1px solid var(--line);
    padding-bottom: 0.4rem;
}

.post-content h3 {
    font-size: 1.02rem;
    color: var(--accent);
}

.post-content h3 .heading-text::before {
    content: "// ";
    color: var(--dim);
    font-weight: 400;
}

.post-content h4 {
    font-size: 0.95rem;
    color: var(--bright);
}

.heading-anchor {
    position: absolute;
    left: -1.15rem;
    top: 0.05em;
    color: var(--dim) !important;
    text-decoration: none !important;
    opacity: 0;
    font-weight: 600;
    font-size: 0.9em;
    transition: opacity 0.15s, color 0.15s;
}

.post-content h2:hover .heading-anchor,
.post-content h3:hover .heading-anchor,
.post-content h4:hover .heading-anchor,
.heading-anchor:focus-visible {
    opacity: 1;
    color: var(--accent) !important;
}

.post-content p {
    margin: 0.95rem 0;
}

/* center images (and image-only paragraphs) — never expand page width */
.post-content p:has(> img:only-child),
.post-content p:has(> a:only-child > img:only-child) {
    text-align: center;
    max-width: 100%;
    overflow: hidden;
}

.post-content img {
    max-width: 100% !important;
    width: auto !important;
    height: auto !important;
    border: 1px solid var(--line);
    margin: 1rem auto;
    display: block;
    border-radius: 2px;
    box-shadow: 0 6px 22px rgba(0, 0, 0, 0.22);
    cursor: zoom-in;
    object-fit: contain;
}

.post-content img.lightbox-openable:hover {
    outline: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
}

/* ----- image lightbox ----- */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.25rem;
    background: rgba(8, 9, 12, 0.72);
    backdrop-filter: blur(10px) saturate(1.05);
    -webkit-backdrop-filter: blur(10px) saturate(1.05);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.22s ease;
}

.lightbox.is-open {
    opacity: 1;
    pointer-events: auto;
}

.lightbox-dialog {
    position: relative;
    max-width: min(1100px, 96vw);
    max-height: min(92vh, 920px);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.65rem;
}

.lightbox-img {
    display: block;
    max-width: min(1100px, 96vw);
    max-height: min(84vh, 860px);
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
    cursor: zoom-out;
    background: #0b0c0e;
}

.lightbox-caption {
    max-width: min(720px, 92vw);
    text-align: center;
    color: #cfcfcf;
    font-size: 0.85rem;
    line-height: 1.45;
}

.lightbox-close {
    position: fixed;
    top: 0.85rem;
    right: 0.85rem;
    z-index: 210;
    appearance: none;
    border: 1px solid rgba(255, 255, 255, 0.18);
    background: rgba(20, 22, 28, 0.88);
    color: #eee;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 999px;
    font-size: 1.15rem;
    font-weight: 700;
    cursor: pointer;
    line-height: 1;
    transition: border-color 0.15s, color 0.15s;
}

.lightbox-close:hover {
    border-color: #d4a574;
    color: #d4a574;
}

.lightbox-close:focus-visible {
    outline: 2px solid #d4a574;
    outline-offset: 2px;
}

html.lightbox-open,
body.lightbox-open {
    overflow: hidden;
}

@media (prefers-reduced-motion: reduce) {
    .lightbox {
        transition: none;
    }
}

.post-content a {
    color: var(--accent);
    word-break: break-word;
}

.post-content ul,
.post-content ol {
    margin: 0.85rem 0;
    padding-left: 1.4rem;
}

.post-content li {
    margin: 0.32rem 0;
}

.post-content li::marker {
    color: var(--dim);
}

.post-content blockquote {
    margin: 1.2rem 0;
    padding: 0.7rem 1rem;
    border-left: 2px solid var(--accent);
    color: var(--mute);
    background: var(--soft);
    border-radius: 0 2px 2px 0;
}

.post-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.1rem auto;
    font-size: 0.88rem;
    display: block;
    overflow-x: auto;
}

.post-content th,
.post-content td {
    border: 1px solid var(--line);
    padding: 0.45rem 0.7rem;
    text-align: left;
}

.post-content th {
    color: var(--dim);
    background: var(--soft);
}

.post-content code {
    font-family: ui-monospace, "Cascadia Code", "SF Mono", Menlo, Consolas, monospace;
    font-size: 0.88em;
    background: var(--soft);
    border: 1px solid var(--line);
    padding: 0.1rem 0.38rem;
    border-radius: 3px;
    color: var(--bright);
}

/* ----- code blocks with copy toolbar -----
 * Always dark (Monokai). Site light mode must NOT lighten these
 * or syntax colors become unreadable against a pale background.
 */
.code-block {
    --code-bg: #1e1f22;
    --code-fg: #f8f8f2;
    --code-toolbar-bg: #16171a;
    --code-border: #2e3036;
    --code-collapse-h: 220px;
    /* shared metrics so gutter line N tracks code line N exactly */
    --code-fs: 0.86rem;
    --code-lh: 1.55;
    --code-pad-block: 1rem;
    --code-font: ui-monospace, "Cascadia Code", "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
    margin: 1.35rem 0;
    border: 1px solid var(--code-border);
    border-radius: 4px;
    background: var(--code-bg);
    overflow: hidden; /* toolbar fixed; scroll lives on pre/codehilite */
    color: var(--code-fg);
}

/* collapsible long code */
.code-scroll {
    position: relative;
    overflow: hidden;
    max-height: none;
    transition: max-height 0.38s cubic-bezier(0.22, 1, 0.36, 1);
}

.code-block.is-collapsed .code-scroll {
    max-height: var(--code-collapse-h);
}

.code-block.is-collapsed .code-scroll::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 3.25rem;
    pointer-events: none;
    background: linear-gradient(
        to bottom,
        rgba(30, 31, 34, 0),
        rgba(30, 31, 34, 0.92) 70%,
        var(--code-bg)
    );
}

.code-expand {
    appearance: none;
    display: none;
    width: 100%;
    border: 0;
    border-top: 1px solid var(--code-border);
    background: var(--code-toolbar-bg);
    color: #d4a574;
    font: inherit;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    padding: 0.55rem 0.75rem;
    cursor: pointer;
    transition: color 0.15s, background 0.15s;
}

.code-block.is-collapsible .code-expand {
    display: block;
}

.code-expand:hover {
    color: #fff;
    background: #121316;
}

.code-expand:focus-visible {
    outline: 2px solid #d4a574;
    outline-offset: -2px;
}

@media (prefers-reduced-motion: reduce) {
    .code-scroll,
    .toc-collapse,
    .toc-chevron {
        transition: none !important;
    }
}

.code-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.4rem 0.7rem;
    border-bottom: 1px solid var(--code-border);
    background: var(--code-toolbar-bg);
}

.code-lang {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #9a9a9a;
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

.code-copy {
    appearance: none;
    border: 1px solid var(--code-border);
    background: #0f1012;
    color: #c8c8c8;
    font: inherit;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.22rem 0.55rem;
    border-radius: 3px;
    cursor: pointer;
    transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.code-copy:hover {
    color: #fff;
    border-color: #d4a574;
}

.code-copy:focus-visible {
    outline: 2px solid #d4a574;
    outline-offset: 2px;
}

.code-copy.is-copied {
    color: #d4a574;
    border-color: #d4a574;
}

.code-copy.is-error {
    color: #e05a5a;
}

/* line-number gutter + code pane
 * Critical: gutter + code must share font-size, line-height, font-family,
 * padding-block and white-space:pre so each number maps 1:1 to a source line.
 */
.code-with-gutter {
    display: flex;
    align-items: flex-start;
    min-width: 0;
    width: 100%;
}

.code-gutter {
    flex: 0 0 auto;
    margin: 0;
    padding: var(--code-pad-block) 0.75rem var(--code-pad-block) 0.9rem;
    border: 0;
    border-right: 1px solid var(--code-border);
    background: #18191c !important;
    color: #6e6e6e;
    font-family: var(--code-font) !important;
    font-size: var(--code-fs) !important;
    line-height: var(--code-lh) !important;
    text-align: right;
    user-select: none;
    -webkit-user-select: none;
    white-space: pre;
    overflow: hidden;
    tab-size: 4;
    box-sizing: border-box;
}

.code-main {
    flex: 1 1 auto;
    min-width: 0;
    overflow-x: auto;
}

.post-content .code-block .code-scroll .codehilite,
.post-content .code-block .code-scroll pre,
.post-content .code-block .code-main .codehilite,
.post-content .code-block .code-main pre,
.post-content .code-block .codehilite,
.post-content .code-block pre {
    margin: 0;
    border: none;
    border-radius: 0;
    /* Override Monokai/Pygments inline bg + light-mode site tokens */
    background: var(--code-bg) !important;
    overflow-x: auto;
    color: var(--code-fg);
}

/* lock pre/code metrics to the same tokens as .code-gutter */
.post-content .code-block .code-main .codehilite,
.post-content .code-block .code-main .codehilite pre,
.post-content .code-block .code-main pre {
    font-family: var(--code-font) !important;
    font-size: var(--code-fs) !important;
    line-height: var(--code-lh) !important; /* beat pygments inline style */
    white-space: pre !important; /* no wrap → no visual line drift */
    tab-size: 4;
    box-sizing: border-box;
}

.post-content .code-block .code-main .codehilite pre,
.post-content .code-block .code-main pre {
    padding: var(--code-pad-block) 1.15rem var(--code-pad-block) 1rem !important;
}

.post-content .code-block .code-main code {
    font-family: var(--code-font) !important;
    font-size: var(--code-fs) !important;
    line-height: var(--code-lh) !important;
    white-space: pre !important;
    display: block;
    tab-size: 4;
}

.post-content pre,
.post-content .codehilite {
    margin: 1.15rem 0;
    border: 1px solid var(--code-border, #2e3036);
    border-radius: 2px;
    overflow-x: auto;
    background: #1e1f22 !important;
    color: #f8f8f2;
}

.post-content .code-block .codehilite {
    border: none;
}

.post-content .codehilite pre,
.post-content pre {
    margin: 0;
    padding: 0.95rem 1rem 1.05rem;
    line-height: 1.6;
    background: transparent !important;
    tab-size: 4;
    color: #f8f8f2;
}

/* Default code text stays light; span[style] from Pygments still wins for tokens */
.post-content pre code,
.post-content .codehilite code {
    font-family: ui-monospace, "Cascadia Code", "SF Mono", Menlo, Consolas, monospace;
    background: none !important;
    border: none;
    padding: 0;
    font-size: 0.86rem;
    color: #f8f8f2;
    white-space: pre;
}

/* Inline `code` in prose still follows site theme */
.post-content :not(pre) > code {
    color: var(--bright);
    background: var(--soft);
    border: 1px solid var(--line);
}

.post-content hr {
    border: none;
    border-top: 1px solid var(--line);
    margin: 2rem 0;
}

.post-content video {
    max-width: 100%;
    margin: 1rem auto;
    display: block;
}

/* prev / next posts */
.post-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-top: 2rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--line);
}

.post-nav-link {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 0.85rem 0.95rem;
    border: 1px solid var(--line);
    border-radius: 4px;
    background: var(--soft);
    text-decoration: none;
    min-width: 0;
    transition: border-color 0.15s, background 0.15s;
}

.post-nav-link:hover {
    border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
    background: color-mix(in srgb, var(--accent) 8%, var(--soft));
}

.post-nav-link.next {
    text-align: right;
    align-items: flex-end;
}

.post-nav-link.empty {
    visibility: hidden;
    pointer-events: none;
    border: none;
    background: transparent;
}

.post-nav-dir {
    font-size: 0.72rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--dim);
    font-weight: 600;
}

.post-nav-title {
    color: var(--fg);
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1.35;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-nav-link:hover .post-nav-title {
    color: var(--accent);
}

.post-end {
    margin-top: 1.5rem;
    padding-top: 1.1rem;
    border-top: 1px solid var(--line);
    color: var(--dim);
    font-size: 0.9rem;
}

/* back to top — floating pill */
.back-to-top {
    position: fixed;
    right: 1.25rem;
    bottom: 1.25rem;
    z-index: 90;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    min-height: 2.5rem;
    padding: 0.45rem 0.85rem;
    border-radius: 999px;
    border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--line));
    background: color-mix(in srgb, var(--surface) 88%, var(--accent));
    color: var(--fg);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transform: translateY(10px);
    transition: opacity 0.2s, transform 0.2s, border-color 0.15s, color 0.15s, background 0.15s;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
    backdrop-filter: blur(8px);
}

.back-to-top.is-visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.back-to-top:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--surface);
}

.back-to-top:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* tablet / mobile: ToC stacks above content but stays sticky under nav */
@media (max-width: 860px) {
    .post-layout.has-toc {
        grid-template-columns: 1fr;
        gap: 1.1rem;
    }

    .toc-panel {
        position: sticky;
        top: calc(var(--nav-h, 3.5rem) + 0.35rem);
        max-height: none;
        z-index: 40;
        /* when collapsed, just the toggle bar sticks */
        background: color-mix(in srgb, var(--bg) 94%, transparent);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
    }

    .toc-panel.is-open {
        max-height: min(50vh, 22rem);
        overflow: auto;
    }

    .heading-anchor {
        left: -0.15rem;
        position: static;
        margin-right: 0.25rem;
        opacity: 0.45;
    }

    .post-featured img,
    .post-content img {
        max-width: 100%;
    }

    .code-block {
        margin-left: -0.15rem;
        margin-right: -0.15rem;
        border-radius: 3px;
    }

    .back-to-top {
        right: 0.85rem;
        bottom: 0.85rem;
        padding: 0.4rem 0.7rem;
        font-size: 0.72rem;
    }
}

@media (max-width: 560px) {
    .post-item {
        grid-template-columns: 1fr;
        gap: 0.25rem;
        padding: 0.85rem 0.85rem;
    }

    .post-hero h1 {
        font-size: 1.22rem;
    }

    .post-meta-line {
        font-size: 0.82rem;
        gap: 0.25rem 0.35rem;
    }

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

    .post-nav-link.next {
        text-align: left;
        align-items: flex-start;
    }

    .post-content {
        font-size: 0.97rem;
        line-height: 1.75;
    }

    .post-content pre code,
    .post-content .codehilite code {
        font-size: 0.8rem;
    }

    .code-toolbar {
        padding: 0.35rem 0.55rem;
    }

    .code-copy {
        font-size: 0.72rem;
        padding: 0.2rem 0.45rem;
    }
}