/* --- Logo link fix --- */
.logo-link {
    text-decoration: none;
    color: inherit;
}

/* --- Nav active state --- */
.nav-active {
    color: var(--neon-blue) !important;
}

/* --- Reading Progress Bar --- */
#reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0%;
    background: var(--neon-blue);
    box-shadow: 0 0 10px rgba(88, 166, 255, 0.7);
    z-index: 1001;
    transition: width 0.1s linear;
}

/* --- Post Layout: ToC sidebar + main --- */
.post-layout {
    display: grid;
    grid-template-columns: 250px 1fr;
    max-width: 1240px;
    margin: 0 auto;
    padding: 2rem 2rem 6rem;
    gap: 3rem;
    align-items: start;
}

/* --- ToC Sidebar --- */
.toc-sidebar {
    position: sticky;
    top: 80px;
    max-height: calc(100vh - 110px);
    overflow-y: auto;
    background: var(--bg-panel);
    border: 1px solid rgba(88, 166, 255, 0.1);
    border-radius: 12px;
    padding: 1.25rem;
    scrollbar-width: thin;
    scrollbar-color: rgba(88, 166, 255, 0.2) transparent;
}

.toc-header {
    font-size: 0.78rem;
    color: var(--text-muted);
    letter-spacing: 0.12em;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid rgba(88, 166, 255, 0.1);
}

#toc {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

#toc a {
    display: block;
    font-size: 0.79rem;
    color: var(--text-muted);
    text-decoration: none;
    padding: 5px 8px;
    border-radius: 5px;
    border-left: 2px solid transparent;
    line-height: 1.45;
    transition: all 0.2s ease;
}

#toc a:hover,
#toc a.active {
    color: var(--neon-blue);
    border-left-color: var(--neon-blue);
    background: rgba(88, 166, 255, 0.06);
}

#toc a.toc-h3 {
    padding-left: 1.4rem;
    font-size: 0.74rem;
    opacity: 0.85;
}

/* --- Post Main --- */
.post-main {
    min-width: 0;
}

/* --- Breadcrumb --- */
.post-breadcrumb {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.post-breadcrumb a {
    color: var(--neon-blue);
    text-decoration: none;
    transition: opacity 0.2s;
}

.post-breadcrumb a:hover { opacity: 0.7; }

/* --- CSS Cover --- */
.post-cover {
    width: 100%;
    height: 300px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #0d1117 0%, #08112b 55%, #050e1f 100%);
}

.post-cover::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(88, 166, 255, 0.07) 1px, transparent 1px),
        linear-gradient(90deg, rgba(88, 166, 255, 0.07) 1px, transparent 1px);
    background-size: 30px 30px;
}

/* Radial glow behind icon */
.post-cover::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, rgba(88, 166, 255, 0.08) 0%, transparent 70%);
}

.cover-icon {
    font-size: 5.5rem;
    color: var(--neon-blue);
    position: relative;
    z-index: 1;
    opacity: 0.82;
    filter: drop-shadow(0 0 32px rgba(88, 166, 255, 0.6));
}

/* --- Post Header --- */
.post-header {
    margin-bottom: 2rem;
}

.post-header h1 {
    font-size: 2.1rem;
    line-height: 1.3;
    margin-bottom: 0.75rem;
    color: var(--text-main);
}

.post-subtitle {
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.65;
    margin-bottom: 1.25rem;
}

/* Terminal-style metadata line */
.post-terminal-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem 1.2rem;
    font-size: 0.82rem;
    color: var(--neon-blue);
    margin-bottom: 1.25rem;
    padding: 0.6rem 0.9rem;
    background: rgba(88, 166, 255, 0.04);
    border: 1px solid rgba(88, 166, 255, 0.1);
    border-radius: 6px;
    width: fit-content;
}

.post-terminal-meta a {
    color: inherit;
    text-decoration: none;
    border-bottom: 1px dashed rgba(88, 166, 255, 0.45);
}

.post-terminal-meta a:hover { opacity: 0.75; }

/* Tags row */
.post-tags-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

/* Action buttons (GitHub, Share) */
.post-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 6px 14px;
    border: 1px solid rgba(88, 166, 255, 0.25);
    border-radius: 6px;
    background: transparent;
    color: var(--text-muted);
    font-size: 0.8rem;
    font-family: var(--font-mono);
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s ease;
}

.action-btn:hover {
    border-color: var(--neon-blue);
    color: var(--neon-blue);
    background: rgba(88, 166, 255, 0.06);
}

/* --- Divider --- */
.post-divider {
    border: none;
    border-top: 1px solid rgba(240, 246, 252, 0.07);
    margin: 2.5rem 0;
}

/* --- Markdown Body --- */
.markdown-body {
    color: var(--text-main);
    line-height: 1.85;
    font-size: 1rem;
}

/* Hide the duplicate h1 from the MD file */
.markdown-body > h1:first-child { display: none; }

.markdown-body h2 {
    font-size: 1.55rem;
    margin: 2.75rem 0 1rem;
    padding-left: 1rem;
    border-left: 4px solid var(--neon-blue);
    color: var(--text-main);
    line-height: 1.35;
}

.markdown-body h3 {
    font-size: 1.15rem;
    margin: 2rem 0 0.75rem;
    color: var(--neon-blue);
}

.markdown-body h4 {
    font-size: 0.95rem;
    margin: 1.5rem 0 0.5rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.07em;
    font-family: var(--font-mono);
}

.markdown-body p {
    margin-bottom: 1.25rem;
    color: var(--text-muted);
}

.markdown-body strong {
    color: var(--text-main);
    font-weight: 600;
}

.markdown-body em {
    color: var(--neon-blue);
    font-style: italic;
}

.markdown-body a {
    color: var(--neon-blue);
    text-decoration: none;
    border-bottom: 1px solid rgba(88, 166, 255, 0.3);
    transition: border-color 0.2s, opacity 0.2s;
}

.markdown-body a:hover {
    border-bottom-color: var(--neon-blue);
    opacity: 0.85;
}

.markdown-body ul,
.markdown-body ol {
    margin: 0 0 1.25rem 1.6rem;
    color: var(--text-muted);
}

.markdown-body li { margin-bottom: 0.45rem; }

.markdown-body blockquote {
    border-left: 3px solid var(--neon-blue);
    margin: 1.75rem 0;
    padding: 0.85rem 1.4rem;
    background: rgba(88, 166, 255, 0.04);
    border-radius: 0 8px 8px 0;
    color: var(--text-muted);
    font-style: italic;
}

/* --- Tables --- */
.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.75rem 0;
    font-size: 0.88rem;
    display: block;
    overflow-x: auto;
}

.markdown-body th {
    background: rgba(88, 166, 255, 0.09);
    color: var(--neon-blue);
    padding: 10px 14px;
    text-align: left;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.05em;
    border-bottom: 1px solid rgba(88, 166, 255, 0.2);
    white-space: nowrap;
}

.markdown-body td {
    padding: 10px 14px;
    border-bottom: 1px solid rgba(240, 246, 252, 0.05);
    color: var(--text-muted);
}

.markdown-body tr:hover td {
    background: rgba(88, 166, 255, 0.03);
}

/* --- Code blocks --- */
.markdown-body pre {
    position: relative;
    margin: 1.75rem 0;
    border-radius: 10px;
    border: 1px solid rgba(88, 166, 255, 0.12);
    overflow: hidden;
}

.markdown-body pre code {
    display: block;
    padding: 1.25rem;
    font-size: 0.84rem;
    line-height: 1.65;
    overflow-x: auto;
    font-family: var(--font-mono);
}

.markdown-body code:not(pre code) {
    background: rgba(88, 166, 255, 0.09);
    border: 1px solid rgba(88, 166, 255, 0.15);
    color: var(--neon-blue);
    padding: 2px 7px;
    border-radius: 4px;
    font-size: 0.84em;
    font-family: var(--font-mono);
}

/* Copy button on code blocks */
.copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 3px 10px;
    background: rgba(13, 17, 23, 0.8);
    border: 1px solid rgba(88, 166, 255, 0.2);
    border-radius: 4px;
    color: var(--text-muted);
    font-size: 0.7rem;
    font-family: var(--font-mono);
    cursor: pointer;
    transition: all 0.2s;
    z-index: 1;
}

.copy-btn:hover {
    border-color: var(--neon-blue);
    color: var(--neon-blue);
}

/* Horizontal rule in markdown */
.markdown-body hr {
    border: none;
    border-top: 1px solid rgba(240, 246, 252, 0.07);
    margin: 2rem 0;
}

/* --- Images --- */
.markdown-body img {
    display: block;
    width: 100%;
    border-radius: 10px;
    border: 1px solid rgba(88, 166, 255, 0.2);
    margin: 0.5rem auto 0;
    cursor: zoom-in;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.markdown-body img:hover {
    border-color: var(--neon-blue);
    box-shadow: 0 0 24px rgba(88, 166, 255, 0.2);
}

/* Caption from alt text */
.img-caption {
    display: block;
    text-align: center;
    font-size: 0.78rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
    margin-top: 0.5rem;
    margin-bottom: 1.75rem;
    opacity: 0.7;
}

/* --- Image Lightbox --- */
#img-lightbox {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 2000;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.92);
    backdrop-filter: blur(6px);
    cursor: zoom-out;
}

#img-lightbox.open {
    display: flex;
}

#img-lightbox img {
    max-width: 92vw;
    max-height: 90vh;
    border-radius: 10px;
    border: 1px solid rgba(88, 166, 255, 0.3);
    box-shadow: 0 0 60px rgba(88, 166, 255, 0.15);
    object-fit: contain;
    cursor: default;
}

#lightbox-caption {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-muted);
    text-align: center;
    max-width: 600px;
}

#lightbox-close {
    position: fixed;
    top: 1rem;
    right: 1.25rem;
    background: transparent;
    border: none;
    color: #fff;
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
    opacity: 0.7;
    transition: opacity 0.2s;
}

#lightbox-close:hover { opacity: 1; }

/* --- Comments --- */
.comments-section {
    margin-top: 1rem;
}

.comments-section h3 {
    font-size: 1rem;
    color: var(--text-muted);
    letter-spacing: 0.08em;
    margin-bottom: 1.5rem;
}

/* --- Back to blog --- */
.back-to-blog {
    margin-top: 3rem;
    text-align: center;
}

/* --- Mobile --- */
@media (max-width: 960px) {
    .post-layout {
        grid-template-columns: 1fr;
        padding: 1.5rem 1.25rem 4rem;
        gap: 0;
    }

    .toc-sidebar {
        position: static;
        max-height: none;
        margin-bottom: 2rem;
    }

    .post-header h1 { font-size: 1.65rem; }
    .post-cover { height: 200px; }
    .cover-icon { font-size: 4rem; }
}

@media (max-width: 480px) {
    .post-terminal-meta { font-size: 0.75rem; }
    .markdown-body h2 { font-size: 1.3rem; }
}