/* ============================================
   Post Page Layout
   ============================================ */
.post-page {
    overflow: auto;
}

.post-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background-color: var(--bg-color);
    border-bottom: var(--border-width) solid var(--border-color);
    z-index: 50;
}

.back-link {
    color: var(--text-color);
    text-decoration: none;
    font-size: 1rem;
    transition: opacity 0.2s ease;
}

.back-link:hover {
    opacity: 0.7;
}

.post-header .search-button {
    position: static;
}

/* ============================================
   Post Content Area
   ============================================ */
.post-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 6rem 1.5rem 3rem;
}

.post-content {
    line-height: 1.7;
}

.post-content .loading {
    text-align: center;
    opacity: 0.7;
}

/* ============================================
   Markdown Rendered Content
   ============================================ */
.post-content h1 {
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: 1.5rem;
    letter-spacing: 0.02em;
}

.post-content h2 {
    font-size: 1.5rem;
    font-weight: 400;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: var(--border-width) solid var(--border-color);
}

.post-content h3 {
    font-size: 1.25rem;
    font-weight: 500;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.post-content p {
    margin-bottom: 1.25rem;
}

.post-content a {
    color: var(--text-color);
    text-decoration: underline;
    text-underline-offset: 2px;
}

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

.post-content ul,
.post-content ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
}

.post-content li {
    margin-bottom: 0.5rem;
}

.post-content blockquote {
    border-left: 3px solid var(--border-color);
    padding-left: 1rem;
    margin: 1.5rem 0;
    opacity: 0.85;
    font-style: italic;
}

.post-content code {
    font-family: 'SF Mono', 'Fira Code', monospace;
    background-color: var(--hover-bg);
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-size: 0.9em;
}

.post-content pre {
    background-color: var(--hover-bg);
    border: var(--border-width) solid var(--border-color);
    padding: 1rem;
    overflow-x: auto;
    margin: 1.5rem 0;
}

.post-content pre code {
    background: none;
    padding: 0;
}

.post-content img {
    max-width: 100%;
    height: auto;
    margin: 1.5rem 0;
    border: var(--border-width) solid var(--border-color);
}

/* Lazy loading images with fade-in */
.post-content img.lazy-image {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.4s ease, transform 0.4s ease;
    background-color: var(--hover-bg);
    min-height: 100px;
}

.post-content img.lazy-image.loaded {
    opacity: 1;
    transform: translateY(0);
}

.post-content img.lazy-image.error {
    opacity: 0.5;
    min-height: 50px;
}

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

/* ============================================
   Mermaid Diagrams
   ============================================ */
.mermaid-diagram {
    margin: 1.5rem 0;
    text-align: center;
    overflow-x: auto;
}

.mermaid-diagram svg {
    max-width: 100%;
    height: auto;
}

/* ============================================
   Two Column Layout
   ============================================ */
.two-column {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 1.5rem 0;
}

.two-column .column ul {
    margin-bottom: 0;
}

.two-column .column p strong {
    display: block;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.two-column .column p:first-child strong {
    margin-top: 0;
}

@media (max-width: 600px) {
    .two-column {
        grid-template-columns: 1fr;
        gap: 0;
    }
}

/* ============================================
   Error State
   ============================================ */
.post-error {
    text-align: center;
    padding: 3rem;
}

.post-error h1 {
    margin-bottom: 1rem;
}

.post-error a {
    color: var(--text-color);
}