/* ====================================================================
   MD POST READER - Transforming Sticky Hero
   ==================================================================== */

.md-post-reader {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--io-surface-base);
    overflow: hidden;
    position: relative;
}

/* ====================================================================
   HERO - Sticky Transforming Header (220px → 60px)
   ==================================================================== */

.md-reader-hero {
    position: sticky;
    top: 0;
    width: 100%;
    height: 220px;
    background-size: cover;
    background-position: center;
    background-color: var(--io-surface-base);
    z-index: var(--io-z-sticky);
    flex-shrink: 0;
    transition: height 300ms cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

/* Collapsed state - shrinks to 60px */
.md-reader-hero.collapsed {
    height: 60px;
}

/* Background image overlay */
.md-reader-hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, 
        var(--io-backdrop-light) 0%, 
        var(--io-backdrop) 60%,
        var(--io-backdrop-heavy) 100%);
    pointer-events: none;
    opacity: 1;
    transition: opacity 300ms ease;
}

.md-reader-hero.collapsed::after {
    opacity: 0;
}

/* Hide background image in collapsed state */
.md-reader-hero.collapsed {
    background-image: none !important;
    background-color: var(--io-surface-overlay);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: none; /* Remove solid border */
}

/* Add incomplete fade border with ::before (since ::after is gradient) */
.md-reader-hero.collapsed::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 15%;
    height: 1px;
    background: var(--io-border-fade-h);
    pointer-events: none;
    z-index: 40;
}


/* ====================================================================
   COLLAPSED TITLE (centered, only visible when collapsed)
   ==================================================================== */

.md-hero-collapsed-title {
    position: absolute;
    top: 0;
    left: 0;
    right: 350px; /* Exclude sidebar width */
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 25;
    opacity: 0;
    pointer-events: none;
    transition: opacity 300ms ease;
    padding: 0 var(--io-space-lg);
}
.md-reader-hero.collapsed .md-hero-collapsed-title {
    opacity: 1;
    pointer-events: auto;
}

.md-hero-collapsed-title span {
    font-size: var(--io-text-base);
    font-weight: 700;
    color: var(--io-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-family: var(--io-font-display);
}

/* ====================================================================
   HERO OVERLAY CONTENT (fades out when collapsed)
   ==================================================================== */

.md-hero-overlay {
    position: absolute;
    inset: 0;
    z-index: 10;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: var(--io-space-xl);
    pointer-events: none;
    opacity: 1;
    transition: opacity 300ms ease;
}

.md-reader-hero.collapsed .md-hero-overlay {
    opacity: 0;
    pointer-events: none;
}

.md-hero-overlay > * {
    pointer-events: auto;
}

/* Title in Hero */
.md-hero-title {
    font-size: var(--io-text-2xl);
    font-weight: 900;
    color: var(--io-text-primary);
    margin-bottom: var(--io-space-sm);
    line-height: 1.2;
    font-family: var(--io-font-display);
    padding: 6px;
    background-color: var(--io-surface-sunken);
    border-radius: 6px;
    width: fit-content; /* Only as wide as text */
    /* No margin - stays left aligned */
}

/* Meta in Hero */
.md-hero-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--io-space-md);
    font-size: var(--io-text-xs);
    color: var(--io-on-accent);
    margin-bottom: var(--io-space-md);
}

.md-meta-item {
    align-items: center;
    gap: var(--io-space-xs);
    padding: 6px;
    background: var(--io-surface-sunken);
    color: var(--io-text-primary);
    border-radius: 4px;
}

.md-meta-item i {
    color: var(--io-accent);
}

/* Author Card in Hero */
.md-hero-author-card {
    display: flex;
    align-items: center;
    gap: var(--io-space-md);
    padding: var(--io-space-md);
    background: var(--io-surface-sunken);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--io-overlay-light);
    border-radius: var(--io-radius-md);
    max-width: 400px;
}

.md-author-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 2px solid var(--io-accent);
    object-fit: cover;
    flex-shrink: 0;
}

.md-author-info {
    flex: 1;
    min-width: 0;
}

.md-author-name {
    font-size: var(--io-text-base);
    font-weight: 700;
    color: var(--io-text-primary);
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.md-author-username {
    font-size: var(--io-text-xs);
    color: var(--io-text-secondary);
}

/* ====================================================================
   ACTION BUTTONS (2 icons only, top-right)
   ==================================================================== */

.md-hero-actions {
    position: absolute;
    top: var(--io-space-lg);
    right: var(--io-space-lg);
    display: flex;
    gap: var(--io-space-sm);
    z-index: 30;
    transition: all 300ms ease;
}

.md-reader-hero.collapsed .md-hero-actions {
    top: 12px;
    right: var(--io-space-lg);
}

.md-hero-action-btn {
    width: 40px;
    height: 40px;
    background: var(--io-surface-sunken);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--io-border);
    border-radius: var(--io-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--io-transition-base);
}

.md-reader-hero.collapsed .md-hero-action-btn {
    width: 36px;
    height: 36px;
    background: var(--io-surface-raised);
}

.md-hero-action-btn:hover {
    background: var(--io-accent);
    border-color: var(--io-accent);
    transform: translateY(-2px);
}

.md-hero-action-btn i {
    font-size: 16px;
    color: var(--io-text-primary);
    transition: color var(--io-transition-base);
}

.md-reader-hero.collapsed .md-hero-action-btn i {
    font-size: 14px;
}

.md-hero-action-btn:hover i {
    color: var(--io-on-accent);
}

/* ====================================================================
   CONTENT LAYOUT - Two Columns
   ==================================================================== */

.md-reader-body {
    display: flex;
    flex: 1;
    overflow: hidden;
    min-height: 0;
}

/* LEFT: Article Content */
.md-reader-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--io-space-2xl) var(--io-space-xl);
    min-width: 0;
    position: relative; /* ADD THIS for absolute button positioning */

    /* HIDE SCROLLBAR */
    -ms-overflow-style: none;  /* IE and Edge */
    scrollbar-width: none;  /* Firefox */
}

.md-reader-content::-webkit-scrollbar {
    display: none;  /* Chrome, Safari, Opera */
}

.md-reader-article {
    max-width: 1200px;
    margin: 0 auto;
}

/* RIGHT: Sidebar (Flex Column) */
.md-reader-sidebar {
    width: 350px;
    flex-shrink: 0;
    background: var(--io-surface-base);
    border-left: 1px solid var(--io-border-subtle);
    padding: var(--io-space-xl);
    display: flex;
    flex-direction: column;
    gap: var(--io-space-lg);
    overflow: hidden;
}

/* Custom scrollbars */
.md-reader-content::-webkit-scrollbar {
    width: 6px;
}

.md-reader-content::-webkit-scrollbar-track {
    background: var(--io-surface-sunken);
}

.md-reader-content::-webkit-scrollbar-thumb {
    background: var(--io-accent-subtle);
    border-radius: var(--io-radius-sm);
}

.md-reader-content::-webkit-scrollbar-thumb:hover {
    background: var(--io-accent);
}

/* ====================================================================
   MARKDOWN CONTENT STYLING
   ==================================================================== */

.md-reader-html {
    font-family: var(--io-font-primary);
    font-size: var(--io-text-base);
    line-height: 1.8;
    color: var(--io-text-primary);
}

.md-reader-html h1,
.md-reader-html h2,
.md-reader-html h3,
.md-reader-html h4,
.md-reader-html h5,
.md-reader-html h6 {
    font-family: var(--io-font-display);
    font-weight: 900;
    color: var(--io-text-primary);
    margin-top: var(--io-space-2xl);
    margin-bottom: var(--io-space-lg);
    line-height: 1.3;
}

.md-reader-html h1 {
    font-size: var(--io-text-3xl);
    border-bottom: 2px solid var(--io-accent);
    padding-bottom: var(--io-space-sm);
}

.md-reader-html h2 {
    font-size: var(--io-text-2xl);
}

.md-reader-html h3 {
    font-size: var(--io-text-xl);
}

.md-reader-html p {
    margin-bottom: var(--io-space-lg);
}

.md-reader-html a {
    color: var(--io-accent);
    text-decoration: none;
    transition: color var(--io-transition-base);
}

.md-reader-html a:hover {
    color: var(--io-accent-bright);
    text-decoration: underline;
}

.md-reader-html pre {
    background: var(--io-surface-raised);
    border: 1px solid var(--io-border);
    padding: var(--io-space-lg);
    padding-top: var(--io-space-xl); /* Space for copy button */
    border-radius: var(--io-radius-sm);
    overflow-x: auto;
    margin-bottom: var(--io-space-lg);
    position: relative;
}

/* HIDE SCROLLBAR but keep functionality */
.md-reader-html pre::-webkit-scrollbar {
    display: none;
}

.md-reader-html pre {
    -ms-overflow-style: none;  /* IE and Edge */
    scrollbar-width: none;  /* Firefox */
}

/* Fade indicator on right edge */
.md-reader-html pre::after {
    content: '';
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 40px;
    background: linear-gradient(90deg, transparent, var(--io-surface-raised));
    pointer-events: none;
    opacity: 0.7;
}

/* Left accent border */
.md-reader-html pre::before {
    content: '';
    position: absolute;
    left: 0;
    top: 15%;
    height: 70%;
    width: 2px;
    background: var(--io-border-fade-accent-v);
    pointer-events: none;
    z-index: 1;
}

.md-reader-html pre code {
    background: none;
    border: none;
    padding: 0;
    color: var(--io-text-primary);
    white-space: pre;
    word-wrap: normal;
    overflow-wrap: normal;
    display: block;
}

/* Copy button on code blocks */
.md-code-copy-btn {
    position: absolute;
    top: var(--io-space-sm);
    right: var(--io-space-sm);
    width: 32px;
    height: 32px;
    background: var(--io-surface-base);
    border: 1px solid var(--io-border);
    border-radius: var(--io-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0.6;
    transition: all var(--io-transition-base);
    z-index: 5555;
}

.md-code-copy-btn:hover {
    opacity: 1;
    background: var(--io-accent);
    border-color: var(--io-accent);
    transform: translateY(-1px);
}

.md-code-copy-btn i {
    font-size: 14px;
    color: var(--io-text-primary);
    transition: color var(--io-transition-base);
}

.md-code-copy-btn:hover i {
    color: var(--io-on-accent);
}

.md-code-copy-btn.copied {
    background: var(--io-success);
    border-color: var(--io-success);
}

.md-code-copy-btn.copied i {
    color: var(--io-on-accent);
}


.md-reader-html blockquote {
    border-left: 4px solid var(--io-accent);
    padding-left: var(--io-space-lg);
    margin: var(--io-space-lg) 0;
    color: var(--io-text-secondary);
    font-style: italic;
}

.md-reader-html ul,
.md-reader-html ol {
    margin-bottom: var(--io-space-lg);
    padding-left: var(--io-space-xl);
}

.md-reader-html li {
    margin-bottom: var(--io-space-sm);
}

.md-reader-html img {
    max-width: 100%;
    height: auto;
    border-radius: var(--io-radius-md);
    border: 1px solid var(--io-border);
    margin: var(--io-space-lg) 0;
}

.md-reader-html table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--io-space-lg);
}

.md-reader-html th,
.md-reader-html td {
    border: 1px solid var(--io-border);
    padding: var(--io-space-sm) var(--io-space-md);
    text-align: left;
}

.md-reader-html th {
    background: var(--io-surface-raised);
    font-weight: 700;
    color: var(--io-accent);
}

.md-reader-html hr {
    border: none;
    border-top: 1px solid var(--io-border);
    margin: var(--io-space-2xl) 0;
}

/* ====================================================================
   POST FOOTER (Keywords, Category)
   ==================================================================== */

.md-post-footer {
    margin-top: var(--io-space-2xl);
    padding-top: var(--io-space-xl);
    border-top: 1px solid var(--io-border);
}

.md-post-keywords {
    display: flex;
    flex-wrap: wrap;
    gap: var(--io-space-sm);
}

.md-keyword-tag {
    display: inline-flex;
    align-items: center;
    gap: var(--io-space-xs);
    background: var(--io-surface-raised);
    border: 1px solid var(--io-border);
    padding: var(--io-space-xs) var(--io-space-md);
    border-radius: var(--io-radius-full);
    font-size: var(--io-text-sm);
    color: var(--io-text-secondary);
    cursor: pointer;
    transition: all var(--io-transition-base);
}

.md-keyword-tag:hover {
    background: var(--io-accent);
    color: var(--io-on-accent);
    border-color: var(--io-accent);
}

.md-keyword-tag i {
    font-size: var(--io-text-xs);
}

/* ====================================================================
   RESPONSIVE
   ==================================================================== */

@media (max-width: 1200px) {
    .md-reader-sidebar {
        width: 300px;
    }
    
    .md-hero-collapsed-title {
        max-width: 45%;
    }
}

@media (max-width: 900px) {
    .md-reader-body {
        flex-direction: column;
    }
    
    .md-reader-sidebar {
        width: 100%;
        border-left: none;
        border-top: 1px solid var(--io-border-subtle);
        max-height: 400px;
    }
    
    .md-reader-hero {
        height: 180px;
    }
    
    .md-reader-hero.collapsed {
        height: 60px;
    }
    
    .md-hero-title {
        font-size: var(--io-text-xl);
  
    }
    
    .md-hero-overlay {
        padding: var(--io-space-lg);
    }
    
    .md-hero-actions {
        top: var(--io-space-md);
        right: var(--io-space-md);
        gap: var(--io-space-xs);
    }
    
    .md-hero-action-btn {
        width: 36px;
        height: 36px;
    }
    
    .md-hero-action-btn i {
        font-size: 14px;
    }
    
    .md-hero-collapsed-title {
        max-width: 40%;
    }
    
    .md-hero-collapsed-title span {
        font-size: var(--io-text-sm);
    }
}

@media (max-width: 600px) {
    .md-reader-content {
        padding: var(--io-space-lg);
    }
    
    .md-reader-sidebar {
        padding: var(--io-space-lg);
    }
    
    .md-hero-title {
        font-size: var(--io-text-lg);
    }
    
    .md-hero-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--io-space-xs);
    }
    
    .md-hero-action-btn {
        width: 32px;
        height: 32px;
    }
    
    .md-hero-action-btn i {
        font-size: 12px;
    }
    
    .md-hero-collapsed-title {
        max-width: 50%;
        padding: 0 var(--io-space-md);
    }
    
    .md-hero-collapsed-title span {
        font-size: var(--io-text-xs);
    }
}

/* ====================================================================
   ANIMATIONS
   ==================================================================== */

.md-post-reader {
    animation: io-fade-in var(--io-transition-base);
}

.md-hero-overlay {
    animation: io-slide-up var(--io-transition-base);
}


/* ====================================================================
   ACCESSIBILITY
   ==================================================================== */

.md-reader-content:focus-visible,
.md-reader-sidebar:focus-visible {
    outline: 2px solid var(--io-accent);
    outline-offset: -2px;
}

.md-hero-action-btn:focus-visible {
    outline: 2px solid var(--io-accent);
    outline-offset: 2px;
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
    .md-post-reader,
    .md-hero-overlay,
    .md-reader-html {
        animation: none;
    }
    
    .md-reader-hero,
    .md-hero-overlay,
    .md-hero-actions,
    .md-hero-action-btn,
    .md-hero-collapsed-title {
        transition: none;
    }
}


/* ====================================================================
   SCROLL TO TOP BUTTON
   ==================================================================== */
.md-scroll-top-btn {
    position: fixed;
    bottom: var(--io-space-xl);
    right: calc(350px + var(--io-space-xl) + var(--io-space-xl));
    width: 48px;
    height: 48px;
    background: var(--io-surface-overlay);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--io-border);
    border-radius: var(--io-radius-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    cursor: pointer;
    opacity: 0;
    transform: translateY(20px) scale(0.8);
    transition: all 300ms cubic-bezier(0.34, 1.56, 0.64, 1);
    pointer-events: none;
    z-index: 100;
    box-shadow: var(--io-shadow-md);
}

.md-scroll-top-btn.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.md-scroll-top-btn:hover {
    background: var(--io-accent);
    border-color: var(--io-accent);
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 8px 24px var(--io-accent-glow);
}

.md-scroll-top-btn i {
    font-size: 10px;
    color: var(--io-text-primary);
    transition: color var(--io-transition-base);
}

.md-scroll-top-btn:hover i {
    color: var(--io-on-accent);
}

.md-scroll-top-btn i:first-child {
    margin-bottom: -4px;
}

@media (max-width: 900px) {
    .md-scroll-top-btn {
        bottom: var(--io-space-lg);
        right: var(--io-space-lg);
    }
}

.blog-viewer-loading,
.blog-viewer-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    gap: var(--io-space-lg);
    padding: var(--io-space-2xl);
    color: var(--io-text-secondary);
}

.blog-viewer-loading i {
    font-size: 48px;
    color: var(--io-accent);
}

.blog-viewer-error i {
    font-size: 64px;
    color: var(--io-error);
}

.blog-viewer-error h2 {
    font-size: var(--io-text-2xl);
    margin: 0;
    color: var(--io-text-primary);
}

.blog-viewer-error p {
    font-size: var(--io-text-sm);
    margin: 0;
}

.blog-viewer-error button {
    margin-top: var(--io-space-lg);
    padding: var(--io-space-sm) var(--io-space-xl);
    background: var(--io-accent);
    color: var(--io-on-accent);
    border: none;
    border-radius: var(--io-radius-sm);
    cursor: pointer;
}