.post-container {
    width: min(100%, 980px);
    margin: 0 auto;
    position: relative;
}

.post-header {
    margin-top: 40px;
    margin-bottom: 30px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--accent-subtle);
}

.post-title {
    font-size: 3.2rem;
    font-weight: 700;
    margin-bottom: 25px;
    line-height: 1.1;
    letter-spacing: -1.5px;
}

.post-meta {
    display: flex;
    gap: 25px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    align-items: center;
    font-family: 'JetBrains Mono', monospace;
}

.post-tag {
    /* Dynamic Color Construction */
    --tag-hue-final: var(--tag-hue, 270); /* Default to purple if missing */
    
    color: hsl(var(--tag-hue-final), var(--tag-saturation), var(--tag-lightness));
    background-color: hsla(var(--tag-hue-final), var(--tag-saturation), var(--tag-lightness), var(--tag-bg-opacity));
    border: 1px solid hsla(var(--tag-hue-final), var(--tag-saturation), var(--tag-lightness), 0.2);
    
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    text-decoration: none;
    margin-right: 8px;
    margin-bottom: 8px;
    transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.post-tag:hover {
    background-color: hsla(var(--tag-hue-final), var(--tag-saturation), var(--tag-lightness), calc(var(--tag-bg-opacity) + 0.1));
    text-decoration: none;
    color: hsl(var(--tag-hue-final), var(--tag-saturation), var(--tag-lightness));
}

/* Semantic Classes (Optional Usage) */
.post-tag.tag-primary { --tag-hue-final: 270; color: var(--color-primary); border-color: var(--color-primary); }
.post-tag.tag-success { --tag-hue-final: 150; color: var(--color-success); border-color: var(--color-success); }
.post-tag.tag-warning { --tag-hue-final: 40;  color: var(--color-warning); border-color: var(--color-warning); }
.post-tag.tag-danger  { --tag-hue-final: 0;   color: var(--color-danger);  border-color: var(--color-danger); }
.post-tag.tag-info    { --tag-hue-final: 210; color: var(--color-info);    border-color: var(--color-info); }

.post-content {
    line-height: 1.65;
    font-size: 1rem;
    width: 100%;
    margin: 0;
    color: var(--text-secondary);
}

.post-toc {
    --post-toc-right: calc(50% - 490px - 260px);
    position: fixed;
    top: var(--post-toc-top, calc(54% + 4.8rem));
    right: var(--post-toc-right);
    transform: translateY(-50%);
    z-index: 20;
    width: 220px;
    padding: 10px 12px 8px;
    max-height: min(var(--post-toc-max-height, 9999px), min(62vh, 560px));
    overflow: auto;
    border: 1px solid transparent;
    border-radius: 10px;
    background: transparent;
    scrollbar-width: thin;
    scrollbar-color: transparent transparent;
}

.post-toc::-webkit-scrollbar {
    width: 5px;
}

.post-toc::-webkit-scrollbar-track {
    background: transparent;
}

.post-toc::-webkit-scrollbar-thumb {
    background: transparent;
    border-radius: 999px;
}

.post-toc:hover {
    scrollbar-color: color-mix(in srgb, var(--text-secondary) 35%, transparent) transparent;
}

.post-toc:hover::-webkit-scrollbar-thumb {
    background: color-mix(in srgb, var(--text-secondary) 30%, transparent);
}

.post-toc:hover::-webkit-scrollbar-thumb:hover {
    background: color-mix(in srgb, var(--text-primary) 42%, transparent);
}

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

.post-toc-list li {
    margin: 3px 0;
}

.post-toc-link {
    display: block;
    overflow: hidden;
    border-radius: 6px;
    position: relative;
    padding: 5px 8px 5px 18px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.84rem;
    font-weight: 600;
    line-height: 1.52;
    letter-spacing: 0.012em;
    white-space: nowrap;
    text-overflow: ellipsis;
    transition: background-color 0.16s ease;
}

.post-toc-link::before {
    content: "";
    position: absolute;
    left: 8px;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0;
    color: color-mix(in srgb, var(--text-secondary) 44%, transparent);
    width: 11px;
    height: 3px;
    border-radius: 999px;
    background: currentColor;
    line-height: 1;
    transition: color 0.16s ease;
}

.post-toc-link.level-3 {
    padding-left: 27px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.01em;
}

.post-toc-link.level-3::before {
    left: 16px;
}

.post-toc-link:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
}

.post-toc-link.is-active {
    color: var(--text-primary);
    background: transparent;
}

.post-toc:hover .post-toc-link.is-active {
    background: color-mix(in srgb, var(--accent-color) 18%, transparent);
}

/* Collapsed-reading mode: only current heading text stays visible. */
.post-toc:not(:hover) .post-toc-link {
    color: transparent;
    position: relative;
}

.post-toc:not(:hover) .post-toc-link::before {
    content: "";
    display: block;
    opacity: 1;
}

.post-toc:not(:hover) .post-toc-link.is-active {
    color: var(--text-primary);
}

.post-toc:not(:hover) .post-toc-link.is-active::before {
    content: "";
    opacity: 0;
}

.post-toc:hover .post-toc-link::before {
    display: none;
    opacity: 0;
}

.post-toc-mobile {
    display: none;
}

.post-toc-mobile summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--text-primary);
}

.post-toc-mobile[open] {
    padding-bottom: 4px;
}

.post-toc-mobile .post-toc-list {
    margin-top: 8px;
}

.post-toc.is-hidden,
.post-toc-mobile.is-hidden {
    display: none !important;
}

.post-actions {
    position: fixed;
    right: 28px;
    --post-actions-bottom-base: 20px;
    --post-actions-bottom: var(--post-actions-bottom-base);
    bottom: var(--post-actions-bottom);
    display: flex;
    gap: 10px;
    z-index: 50;
}

.post-action {
    width: 44px;
    height: 44px;
    border: 1px solid var(--accent-subtle);
    background: transparent;
    color: var(--text-secondary);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    opacity: 1;
    transition: opacity 0.2s ease, border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.post-action:hover {
    opacity: 1;
    border-color: var(--text-primary);
    color: var(--text-primary);
    background: var(--hover-bg);
}

.post-top {
    opacity: 0;
    pointer-events: none;
    transform: translateY(6px);
}

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

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

.post-content h2 {
    margin-top: 36px;
    margin-bottom: 10px;
    font-size: 1.5rem;
    letter-spacing: -0.4px;
    color: var(--text-primary);
    border-bottom: 1px solid var(--accent-subtle);
    padding-bottom: 6px;
}

.post-content h3 {
    margin-top: 24px;
    margin-bottom: 8px;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.post-content h4,
.post-content h5,
.post-content h6 {
    margin-top: 18px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.post-content p { margin-bottom: 14px; }
.post-content hr { margin: 28px 0; }

.post-content ul {
    margin-top: 4px;
    margin-bottom: 10px;
    padding-left: 22px;
    list-style-type: disc;
}

.post-content ol {
    margin-top: 6px;
    margin-bottom: 14px;
    padding-left: 22px;
    list-style-type: decimal;
}

.post-content li {
    margin-top: 1px;
    margin-bottom: 1px;
    padding-left: 4px;
}

.post-content li p {
    margin-bottom: 0;
    margin-top: 0;
}

.post-content li li {
    margin-bottom: 2px;
}

.post-content li:last-child {
    margin-bottom: 0;
}

.post-content ul ul,
.post-content ol ul,
.post-content ul ol,
.post-content ol ol {
    margin-top: 5px;
    margin-bottom: 5px;
    padding-left: 20px;
}

.post-content strong {
    color: var(--text-primary);
    font-weight: 700;
}

.post-content em {
    color: var(--text-primary);
}

.post-content a {
    color: var(--accent-color);
    cursor: pointer;
    text-decoration-color: color-mix(in srgb, var(--accent-color) 65%, transparent);
    text-underline-offset: 3px;
    text-decoration-thickness: 1.5px;
    transition: color 0.2s ease, text-decoration-color 0.2s ease, background-color 0.2s ease, opacity 0.2s ease;
}

.post-content a:hover {
    color: color-mix(in srgb, var(--accent-color) 85%, #ffffff);
    text-decoration-color: currentColor;
    opacity: 0.95;
}

.post-content blockquote {
    margin: 18px 0;
    padding: 12px 16px;
    border-left: 4px solid var(--blockquote-border);
    border-radius: 0 8px 8px 0;
    background: color-mix(in srgb, var(--tile-bg-1) 86%, transparent);
    color: var(--text-primary);
}

.post-content blockquote > :last-child {
    margin-bottom: 0;
}

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

.post-content ol li::marker {
    color: var(--text-primary);
    font-weight: 600;
}

.post-content ul.task-list {
    list-style: none;
    padding-left: 2px;
}

.post-content ul.task-list > li {
    padding-left: 0;
}

.post-content ul.task-list input[type="checkbox"] {
    margin-right: 8px;
    accent-color: var(--accent-color);
}

.post-content img {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 18px auto;
    border-radius: 10px;
    border: 1px solid var(--accent-subtle);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease, opacity 0.2s ease;
}

.post-content img.is-tall-image {
    max-height: min(72vh, 920px);
    width: auto;
    object-fit: contain;
}

.post-content img.is-zoomable {
    cursor: zoom-in;
}

.post-content img.is-zoomable:hover {
    border-color: color-mix(in srgb, var(--accent-color) 20%, var(--accent-subtle));
}

.post-content figure {
    margin: 22px 0;
}

.post-content figcaption {
    margin-top: -6px;
    margin-bottom: 6px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.post-content table {
    background-color: var(--tile-bg-1);
}

.post-content tbody tr:nth-child(even) td {
    background-color: color-mix(in srgb, var(--hover-bg) 70%, transparent);
}

.post-content pre {
    background-color: color-mix(in srgb, var(--tile-bg-1) 92%, #000000);
}

.post-content .mermaid,
.post-content .mermaid svg {
    background: transparent !important;
    border: 0 !important;
    box-shadow: none !important;
}

.post-content .mermaid {
    text-align: center;
}

.post-content .mermaid svg {
    display: block;
    margin: 0 auto;
}

.post-content details {
    margin: 14px 0;
    padding: 10px 12px;
    border: 1px solid var(--accent-subtle);
    border-radius: 8px;
    background: color-mix(in srgb, var(--tile-bg-1) 80%, transparent);
}

.post-content details > :last-child {
    margin-bottom: 0;
}

.post-content summary {
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 600;
    margin-bottom: 8px;
}

.post-content kbd {
    background-color: color-mix(in srgb, var(--tile-bg-1) 90%, transparent);
}

.post-content sup,
.post-content sub {
    color: var(--text-primary);
}

.post-content .footnote-ref {
    position: relative;
}

.post-content .footnote-ref a {
    display: inline;
    padding: 0;
    color: var(--accent-color);
    font-size: 0.78rem;
    font-weight: 600;
    line-height: 1;
    text-decoration: none;
    border: 0;
    background: transparent;
    transition: color 0.18s ease, opacity 0.18s ease;
}

.post-content .footnote-ref a:hover,
.post-content .footnote-ref a:focus-visible {
    color: var(--text-primary);
    opacity: 0.9;
}

.post-content .footnotes {
    margin-top: 2.6rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--accent-subtle);
    color: var(--text-secondary);
}

.post-content .footnotes hr {
    display: none;
}

.post-content .footnotes ol {
    padding-left: 1.25rem;
}

.post-content .footnotes li {
    margin-bottom: 0.9rem;
}

.post-content .footnote-backref {
    text-decoration: none;
    margin-left: 0.35rem;
}

.footnote-preview {
    position: fixed;
    z-index: 120;
    --footnote-arrow-size: 10px;
    --footnote-arrow-left: 50%;
    max-width: min(32rem, calc(100vw - 24px));
    padding: 0.85rem 0.95rem;
    border-radius: 14px;
    border: 1px solid color-mix(in srgb, var(--accent-subtle) 80%, var(--text-secondary));
    background: color-mix(in srgb, var(--tile-bg-1) 96%, var(--bg-color));
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.12);
    color: var(--text-primary);
    font-size: 0.92rem;
    line-height: 1.65;
    opacity: 0;
    visibility: hidden;
    transform: translateY(6px);
    transition: opacity 0.16s ease, transform 0.16s ease, visibility 0.16s ease;
    pointer-events: auto;
}

.footnote-preview.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.footnote-preview::after {
    content: "";
    position: absolute;
    left: clamp(18px, var(--footnote-arrow-left), calc(100% - 18px));
    width: var(--footnote-arrow-size);
    height: var(--footnote-arrow-size);
    background: inherit;
    border-right: 1px solid color-mix(in srgb, var(--accent-subtle) 80%, var(--text-secondary));
    border-bottom: 1px solid color-mix(in srgb, var(--accent-subtle) 80%, var(--text-secondary));
    transform: translateX(-50%) rotate(45deg);
}

.footnote-preview[data-side="top"]::after {
    bottom: calc(var(--footnote-arrow-size) * -0.5 - 1px);
}

.footnote-preview[data-side="bottom"]::after {
    top: calc(var(--footnote-arrow-size) * -0.5 - 1px);
    transform: translateX(-50%) rotate(225deg);
}

.footnote-preview p:last-child {
    margin-bottom: 0;
}

body.has-lightbox-open {
    overflow: hidden;
}

.image-lightbox {
    position: fixed;
    inset: 0;
    z-index: 160;
    display: grid;
    place-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

.image-lightbox.is-open {
    opacity: 1;
    visibility: visible;
}

.image-lightbox-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.72);
    backdrop-filter: blur(10px);
}

.image-lightbox-shell {
    position: relative;
    z-index: 1;
    width: min(98vw, 1400px);
    height: min(94vh, 980px);
}

.image-lightbox-close {
    position: absolute;
    top: 18px;
    right: 18px;
    z-index: 3;
    width: 42px;
    height: 42px;
    border: 0;
    border-radius: 999px;
    background: color-mix(in srgb, var(--bg-color) 56%, transparent);
    backdrop-filter: blur(10px);
    color: var(--text-primary);
    font-size: 1.7rem;
    line-height: 1;
    transition: background-color 0.18s ease, transform 0.18s ease;
}

.image-lightbox-close:hover,
.image-lightbox-action:hover {
    background: color-mix(in srgb, var(--hover-bg) 96%, var(--tile-bg-2));
    transform: translateY(-1px);
}

.image-lightbox-stage {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
    display: grid;
    place-items: center;
    padding: 16px;
    user-select: none;
}

.image-lightbox-stage.is-draggable {
    cursor: grab;
}

.image-lightbox-stage.is-draggable:active {
    cursor: grabbing;
}

.image-lightbox-image {
    position: absolute;
    left: 50%;
    top: 50%;
    max-width: none;
    max-height: none;
    object-fit: contain;
    transform-origin: center center;
    transition: transform 0.16s ease;
    cursor: zoom-in;
    will-change: transform;
}

.image-lightbox-image.is-dragging,
.image-lightbox-stage.is-draggable .image-lightbox-image {
    cursor: grab;
}

.image-lightbox-image.is-dragging {
    cursor: grabbing;
}

.image-lightbox-toolbar {
    position: absolute;
    left: 50%;
    bottom: 18px;
    z-index: 3;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--bg-color) 56%, transparent);
    border: 1px solid color-mix(in srgb, var(--glass-border) 88%, transparent);
    backdrop-filter: blur(10px);
    transform: translateX(-50%);
}

.image-lightbox-action {
    min-width: 52px;
    height: 40px;
    padding: 0 14px;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: var(--text-primary);
    font-weight: 600;
    transition: background-color 0.18s ease, transform 0.18s ease;
}

.image-lightbox-caption {
    position: absolute;
    left: 18px;
    bottom: 18px;
    z-index: 2;
    max-width: min(42ch, calc(100% - 180px));
    margin: 0;
    padding: 0.55rem 0.8rem;
    border-radius: 999px;
    background: color-mix(in srgb, var(--bg-color) 52%, transparent);
    backdrop-filter: blur(10px);
    color: color-mix(in srgb, var(--text-secondary) 92%, white);
    font-size: 0.92rem;
}

.post-content hr {
    border: 0;
    border-top: 1px solid var(--accent-subtle);
    opacity: 0.9;
}

[data-theme="dark"] .post-content {
    color: #cbd5e1;
}

[data-theme="dark"] .post-toc {
    border-color: transparent;
    background: transparent;
}

[data-theme="dark"] .post-toc-link {
    color: #cbd5e1;
}

[data-theme="dark"] .post-toc-link:hover {
    color: #f8fafc;
    background: rgba(148, 163, 184, 0.14);
}

[data-theme="dark"] .post-toc-link.is-active {
    color: #f8fafc;
    background: transparent;
}

[data-theme="dark"] .post-toc:hover .post-toc-link.is-active {
    background: rgba(94, 234, 212, 0.14);
}

[data-theme="dark"] .post-toc:not(:hover) .post-toc-link::before {
    color: rgba(203, 213, 225, 0.34);
}

[data-theme="dark"] .post-content p,
[data-theme="dark"] .post-content li {
    color: #d1d5db;
}

[data-theme="dark"] .post-content h2 {
    border-bottom-color: rgba(255, 255, 255, 0.14);
}

[data-theme="dark"] .post-content a {
    color: #5eead4;
    text-decoration-color: rgba(94, 234, 212, 0.55);
}

[data-theme="dark"] .post-content a:hover {
    color: #99f6e4;
    background-color: rgba(94, 234, 212, 0.08);
}

[data-theme="dark"] .post-content blockquote {
    border-left-color: #34d399;
    background: rgba(16, 185, 129, 0.08);
    color: #e5e7eb;
}

[data-theme="dark"] .post-content table {
    border-color: rgba(255, 255, 255, 0.14);
}

[data-theme="dark"] .post-content th,
[data-theme="dark"] .post-content td {
    border-color: rgba(255, 255, 255, 0.12);
}

[data-theme="dark"] .post-content thead {
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .post-content tbody tr:nth-child(even) td {
    background: rgba(255, 255, 255, 0.02);
}

[data-theme="dark"] .post-content tr:hover td {
    background: rgba(52, 211, 153, 0.09);
}

[data-theme="dark"] .post-content .footnote-ref a {
    background: transparent;
    border-color: transparent;
}

[data-theme="dark"] .post-content .footnote-ref a:hover,
[data-theme="dark"] .post-content .footnote-ref a:focus-visible {
    background: transparent;
    border-color: transparent;
}

[data-theme="dark"] .footnote-preview {
    border-color: rgba(255, 255, 255, 0.12);
    background: color-mix(in srgb, var(--tile-bg-1) 94%, #000000);
    box-shadow: 0 22px 48px rgba(0, 0, 0, 0.34);
}

[data-theme="dark"] .footnote-preview::after {
    border-right-color: rgba(255, 255, 255, 0.12);
    border-bottom-color: rgba(255, 255, 255, 0.12);
}

[data-theme="dark"] .post-content img {
    border-color: rgba(255, 255, 255, 0.16);
    background: rgba(255, 255, 255, 0.02);
}

[data-theme="dark"] .post-content img.is-zoomable:hover {
    border-color: rgba(94, 234, 212, 0.28);
}

[data-theme="dark"] .image-lightbox-shell {
    background: transparent;
    border-color: transparent;
    box-shadow: none;
}

[data-theme="dark"] .image-lightbox-toolbar {
    border-color: rgba(255, 255, 255, 0.12);
}

[data-theme="dark"] .image-lightbox-close,
[data-theme="dark"] .image-lightbox-action {
    color: #f8fafc;
}

[data-theme="dark"] .post-content details {
    border-color: rgba(255, 255, 255, 0.18);
    background: rgba(255, 255, 255, 0.03);
}

[data-theme="dark"] .post-content summary {
    color: #f3f4f6;
}

[data-theme="dark"] .post-content figcaption {
    color: #9ca3af;
}

@media (max-width: 1480px) {
    .post-container {
        width: min(100%, 980px);
    }

    .post-toc {
        display: none !important;
    }

    .post-toc-mobile {
        display: block;
        width: min(100%, 980px);
        margin: 0 auto 12px;
        border: 1px solid var(--accent-subtle);
        border-radius: 10px;
        padding: 10px 12px;
        background: color-mix(in srgb, var(--tile-bg-1) 62%, transparent);
    }

}

@media (max-width: 768px) {
    .post-actions {
        right: 18px;
        --post-actions-bottom-base: 70px;
    }
}