/* PRELOAD - Prevent Transition Glitch on Page Load */
html.preload, 
html.preload * {
    -webkit-transition: none !important;
    -moz-transition: none !important;
    -ms-transition: none !important;
    -o-transition: none !important;
    transition: none !important;
}

/* THEME SWITCHING - Suppress per-element transitions during View Transition */
html.theme-switching,
html.theme-switching *,
html.theme-switching *::before,
html.theme-switching *::after {
    -webkit-transition: none !important;
    -moz-transition: none !important;
    -ms-transition: none !important;
    -o-transition: none !important;
    transition: none !important;
}

/* View Transition API - Custom circular reveal animation */
::view-transition-old(root),
::view-transition-new(root) {
    animation: none;
    mix-blend-mode: normal;
}
::view-transition-old(root) {
    z-index: 1;
}
::view-transition-new(root) {
    z-index: 9999;
}

/* ==========================================================================
   SYSTEM KNOWLEDGE - ULTRA MODERN & SMOOTH STYLESHEET
   ========================================================================== */

:root {
    --bg-body: #ffffff;
    --bg-card: #f8fafc;
    --bg-sidebar: #f8fafc;
    --bg-content: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --primary: #2563eb;
    --primary-light: #eff6ff;
    --primary-glow: rgba(37, 99, 235, 0.15);
    --code-bg: #f8fafc;
    --code-text: #0f172a;
    --mac-header-bg: #e2e8f0;
    --mac-header-text: #475569;
    --inline-code-bg: #f1f5f9;
    --inline-code-color: #be185d;
    --dot-color: rgba(148, 163, 184, 0.18);
    --selection-bg: rgba(37, 99, 235, 0.2);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
}

[data-theme="dark"] {
    --bg-body: #0f172a;
    --bg-card: #1e293b;
    --bg-sidebar: #1e293b;
    --bg-content: #0f172a;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border: #334155;
    --primary: #3b82f6;
    --primary-light: #1e3a8a;
    --primary-glow: rgba(59, 130, 246, 0.25);
    --code-bg: #111827;
    --code-text: #f8fafc;
    --mac-header-bg: #0f172a;
    --mac-header-text: #94a3b8;
    --inline-code-bg: #1e293b;
    --inline-code-color: #f472b6;
    --dot-color: rgba(255, 255, 255, 0.06);
    --selection-bg: rgba(59, 130, 246, 0.35);
}

::selection {
    background-color: var(--selection-bg);
    color: inherit;
}

/* ==========================================================================
   GLOBAL TRANSITIONS & BASE STYLES
   ========================================================================== */

* {
    box-sizing: border-box;
}

body, 
#sidebar, 
#right-sidebar, 
.article-container, 
.markdown-body, 
.mac-window-header, 
.search-box input, 
body, 
#sidebar, 
#main-content, 
.article-container, 
#right-sidebar, 
.sticky-topbar,
.nav-item, 
.category-title,
.callout, 
pre, 
code, 
table, 
th, 
td, 
blockquote, 
.card, 
.post-nav-card, 
.toc-container,
.heading-anchor,
h1, h2, h3, h4, h5, h6,
p, li, span, a,
button,
input,
svg,
.copy-btn-floating,
.code-wrap-toggle,
.code-expand-toggle,
.font-size-btn,
.brand,
.table-scroll-wrapper {
    transition: background-color 0.35s cubic-bezier(0.16, 1, 0.3, 1),
                color 0.28s cubic-bezier(0.16, 1, 0.3, 1),
                border-color 0.35s cubic-bezier(0.16, 1, 0.3, 1),
                box-shadow 0.35s cubic-bezier(0.16, 1, 0.3, 1),
                fill 0.28s cubic-bezier(0.16, 1, 0.3, 1),
                stroke 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

body {
    display: flex;
    flex-direction: row;
    background-color: var(--bg-body);
    background-image: radial-gradient(var(--dot-color) 1.25px, transparent 1.25px);
    background-size: 24px 24px;
    background-attachment: fixed;
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.7;
    margin: 0;
    overflow-x: hidden;
    height: auto !important;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* ==========================================================================
   PAGE REVEAL ANIMATION
   ========================================================================== */

@keyframes pageReveal {
    0% {
        opacity: 0;
        transform: translateY(14px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.article-container {
    position: relative;
    animation: pageReveal 0.45s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    background: var(--bg-content) !important;
    border: none !important;
    box-shadow: none !important;
    padding: 20px 40px 100px;
    max-width: 860px;
    margin: 0 auto;
}

/* Top Subtle Ambient Glow */
.article-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 650px;
    height: 240px;
    background: radial-gradient(ellipse at top, var(--primary-glow) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
    opacity: 0.8;
}

/* ==========================================================================
   SIDEBAR & NAVIGATION (LEFT)
   ========================================================================== */

#sidebar {
    width: 280px;
    height: 100vh;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    padding: 20px 16px;
    overflow-y: auto;
    flex-shrink: 0;
    order: 1;
    box-sizing: border-box;
}

#main-content {
    flex: 1 1 0%;
    min-width: 0;
    order: 2;
    box-sizing: border-box;
}

#sidebar .brand {
    font-size: 1rem !important;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px !important;
    padding: 12px 12px 20px 12px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}

#sidebar .brand svg {
    width: 20px !important;
    height: 20px !important;
    flex-shrink: 0;
}

/* Theme Toggle Button & Animation */
.theme-toggle {
    margin-left: auto !important;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg-body);
    color: var(--text-main);
    cursor: pointer;
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), 
                background-color 0.2s, 
                border-color 0.2s,
                box-shadow 0.2s !important;
}

.theme-toggle:hover {
    transform: rotate(20deg) scale(1.1);
    box-shadow: 0 2px 8px var(--primary-glow);
    border-color: var(--primary);
}

.theme-toggle:active {
    transform: rotate(90deg) scale(0.92);
}

.theme-animating {
    animation: themeSpin 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes themeSpin {
    0% { transform: rotate(0deg) scale(1); }
    50% { transform: rotate(180deg) scale(1.2); }
    100% { transform: rotate(360deg) scale(1); }
}

.sidebar-close-btn {
    display: none;
}

/* Search Box */
.search-box {
    padding: 0 4px 16px 4px;
    position: relative;
}

.search-box input {
    width: 100%;
    padding: 10px 14px 10px 38px;
    padding-right: 68px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background-color: var(--bg-body);
    font-size: 0.875rem;
    color: var(--text-main);
    outline: none;
    box-sizing: border-box;
    font-family: var(--font-sans);
    text-overflow: ellipsis;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1) !important;
}

.search-box input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow), 0 2px 8px rgba(0, 0, 0, 0.04);
    transform: translateY(-1px);
}

.search-box svg {
    position: absolute;
    left: 16px;
    top: 12px;
    width: 16px;
    height: 16px;
    color: var(--text-muted);
}

/* Navigation Items */
#nav-menu {
    flex-grow: 1;
    overflow-y: auto;
    padding: 0 4px;
}

.category-title {
    font-size: 0.725rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    margin: 20px 0 8px 8px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    margin-bottom: 3px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 8px;
    border: 1px solid transparent;
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1),
                background-color 0.2s cubic-bezier(0.4, 0, 0.2, 1),
                color 0.2s,
                box-shadow 0.2s !important;
}

.nav-item svg {
    width: 17px;
    height: 17px;
    color: var(--text-muted);
    flex-shrink: 0;
    transition: transform 0.2s ease, color 0.2s ease;
}

.nav-item:hover {
    transform: translateX(4px);
    background-color: var(--border);
    color: var(--text-main);
}

.nav-item:hover svg {
    color: var(--primary);
    transform: scale(1.1);
}

.nav-item:active {
    transform: translateX(2px) scale(0.98);
}

.nav-item.active {
    background-color: var(--primary-light);
    color: var(--primary);
    font-weight: 600;
    border-color: rgba(37, 99, 235, 0.2);
    box-shadow: 0 2px 8px var(--primary-glow);
}

.nav-item.active svg {
    color: var(--primary);
}

[data-theme="dark"] .nav-item.active {
    background-color: rgba(59, 130, 246, 0.15);
    color: #60a5fa;
    border-color: rgba(59, 130, 246, 0.3);
}

[data-theme="dark"] .nav-item.active svg {
    color: #60a5fa;
}

/* ==========================================================================
   MAIN CONTENT & TYPOGRAPHY
   ========================================================================== */

#main-content {
    flex: 1;
    min-width: 0;
    padding: 40px 60px;
    overflow-y: visible !important;
    height: auto !important;
}

.markdown-body {
    font-size: 1.05rem;
    color: var(--text-main);
}

.markdown-body h1 {
    font-size: 2.35rem;
    font-weight: 800;
    line-height: 1.25;
    margin-top: 0;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
    color: var(--text-main);
    letter-spacing: -0.025em;
}

.markdown-body h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-top: 2.2em;
    margin-bottom: 0.8em;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
    color: var(--text-main);
    letter-spacing: -0.02em;
    position: relative;
    scroll-margin-top: 80px;
}

.markdown-body h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 1.8em;
    margin-bottom: 0.6em;
    color: var(--text-main);
    position: relative;
    scroll-margin-top: 80px;
}

.markdown-body h4 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-top: 1.4em;
    margin-bottom: 0.5em;
    color: var(--text-main);
    position: relative;
    scroll-margin-top: 80px;
}

.markdown-body p, 
.markdown-body li {
    font-size: 1rem;
    line-height: 1.75;
    color: var(--text-main);
    margin-bottom: 1.2em;
    max-width: 75ch;
}

.markdown-body a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.15s, border-bottom 0.15s;
    border-bottom: 1px solid transparent;
}

.markdown-body a:hover {
    border-bottom-color: var(--primary);
}

.markdown-body blockquote {
    border-left: 4px solid var(--primary);
    margin: 1.6em 0;
    padding: 1em 1.4em;
    background: var(--primary-light);
    border-radius: 0 10px 10px 0;
    color: var(--text-main);
}

[data-theme="dark"] .markdown-body blockquote {
    background: rgba(59, 130, 246, 0.1);
    color: #93c5fd;
}

.markdown-body hr {
    height: 1px;
    background-color: var(--border);
    border: none;
    margin: 2.5em 0;
}

/* ==========================================================================
   HEADING ANCHOR LINKS (#)
   ========================================================================== */

.heading-anchor {
    position: absolute;
    left: -28px;
    top: 50%;
    transform: translateY(-50%) translateX(-4px);
    opacity: 0;
    color: var(--text-muted) !important;
    text-decoration: none;
    border: none !important;
    transition: opacity 0.25s cubic-bezier(0.4, 0, 0.2, 1), 
                transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), 
                color 0.2s !important;
    font-size: 0.8em;
    padding: 0 4px;
}

.heading-anchor:hover {
    color: var(--primary) !important;
    transform: translateY(-50%) scale(1.15) !important;
}

.markdown-body h2:hover .heading-anchor, 
.markdown-body h3:hover .heading-anchor,
.markdown-body h4:hover .heading-anchor {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
}

/* ==========================================================================
   CODE BLOCKS & TERMINAL UI
   ========================================================================== */

.markdown-body p code, 
.markdown-body li code {
    background-color: var(--inline-code-bg);
    color: var(--inline-code-color);
    padding: 0.2em 0.45em;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.85em;
    border: 1px solid var(--border);
}

.markdown-body pre {
    background: var(--code-bg) !important;
    border-radius: 12px;
    border: 1px solid var(--border);
    margin: 1.8em 0;
    overflow: hidden;
    position: relative;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
    transition: box-shadow 0.3s cubic-bezier(0.4, 0, 0.2, 1), 
                transform 0.25s ease,
                border-color 0.3s !important;
}

.markdown-body pre:hover {
    box-shadow: 0 8px 24px -4px rgba(0, 0, 0, 0.08);
    transform: translateY(-1px);
}

[data-theme="dark"] .markdown-body pre:hover {
    box-shadow: 0 8px 24px -4px rgba(0, 0, 0, 0.45);
}

.mac-window-header {
    background: var(--mac-header-bg);
    padding: 9px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
}

.mac-dots {
    display: flex;
    gap: 6px;
}

.mac-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.mac-dots:hover .mac-dot {
    transform: scale(1.15);
}

.mac-dot.red { background: #ff5f56; }
.mac-dot.yellow { background: #ffbd2e; }
.mac-dot.green { background: #27c93f; }

.code-lang-label {
    font-family: var(--font-mono);
    font-size: 0.725rem;
    color: var(--mac-header-text);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.copy-btn-floating {
    background: var(--bg-body);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--mac-header-text);
    font-family: var(--font-mono);
    font-size: 0.725rem;
    padding: 3px 9px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1) !important;
}

.copy-btn-floating:hover {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
    transform: translateY(-1px);
    box-shadow: 0 2px 6px var(--primary-glow);
}

.copy-btn-floating:active {
    transform: scale(0.92);
}

.markdown-body pre code {
    display: block;
    padding: 18px 20px;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--code-text);
    background: none;
    border: none;
}

/* ==========================================================================
   SYNTAX HIGHLIGHTING TOKENS (DARK MODE IN-CSS SYNC)
   ========================================================================== */

[data-theme="dark"] .hljs-comment,
[data-theme="dark"] .hljs-quote { color: #8b949e; font-style: italic; }
[data-theme="dark"] .hljs-keyword,
[data-theme="dark"] .hljs-selector-tag,
[data-theme="dark"] .hljs-subst { color: #ff7b72; font-weight: 600; }
[data-theme="dark"] .hljs-number,
[data-theme="dark"] .hljs-literal { color: #79c0ff; }
[data-theme="dark"] .hljs-string,
[data-theme="dark"] .hljs-doctag { color: #a5d6ff; }
[data-theme="dark"] .hljs-title,
[data-theme="dark"] .hljs-section,
[data-theme="dark"] .hljs-selector-id { color: #d2a8ff; font-weight: 600; }
[data-theme="dark"] .hljs-type,
[data-theme="dark"] .hljs-class .hljs-title { color: #ffa657; }
[data-theme="dark"] .hljs-tag,
[data-theme="dark"] .hljs-name,
[data-theme="dark"] .hljs-attribute { color: #7ee787; }
[data-theme="dark"] .hljs-variable,
[data-theme="dark"] .hljs-template-variable { color: #ffa657; }
[data-theme="dark"] .hljs-built_in,
[data-theme="dark"] .hljs-builtin-name { color: #ffa657; }
[data-theme="dark"] .hljs-symbol,
[data-theme="dark"] .hljs-bullet { color: #f2cc60; }

/* ==========================================================================
   TABLES
   ========================================================================== */

.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 2em 0;
    font-size: 0.9rem;
}

.markdown-body th, 
.markdown-body td {
    padding: 13px 18px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

.markdown-body th {
    background-color: var(--bg-card);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border);
}

.markdown-body tr:hover td {
    background-color: rgba(37, 99, 235, 0.04);
}

[data-theme="dark"] .markdown-body tr:hover td {
    background-color: rgba(96, 165, 250, 0.05);
}

.markdown-body td code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    padding: 2px 7px;
    border-radius: 5px;
    background: rgba(37, 99, 235, 0.07) !important;
    color: var(--primary) !important;
    border: 1px solid rgba(37, 99, 235, 0.18) !important;
    font-weight: 500;
}

[data-theme="dark"] .markdown-body td code {
    background: rgba(96, 165, 250, 0.12) !important;
    color: #93c5fd !important;
    border-color: rgba(96, 165, 250, 0.25) !important;
}

/* ==========================================================================
   TOC (RIGHT SIDEBAR)
   ========================================================================== */

#right-sidebar {
    width: 260px;
    height: 100vh;
    position: sticky;
    top: 0;
    padding: 40px 20px;
    flex-shrink: 0;
    border-left: 1px solid var(--border);
    overflow-y: auto;
    align-self: flex-start;
    background: var(--bg-sidebar);
    order: 3;
    box-sizing: border-box;
    margin-left: auto;
}

#toc-container {
    font-size: 0.85rem;
}

#toc-container .toc-title {
    font-size: 0.725rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    margin-bottom: 16px;
}

#toc-container .toc-item {
    position: relative;
    display: block;
    color: var(--text-muted);
    text-decoration: none;
    padding: 6px 12px;
    border-radius: 6px;
    margin-bottom: 2px;
    line-height: 1.4;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1) !important;
}

#toc-container .toc-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 2px;
    bottom: 2px;
    width: 3px;
    background: var(--primary);
    border-radius: 4px;
    transform: scaleY(0);
    opacity: 0;
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s ease !important;
}

#toc-container .toc-item:hover {
    color: var(--text-main);
    background: var(--bg-card);
    transform: translateX(4px);
}

#toc-container .toc-item.active {
    color: var(--primary);
    background: var(--primary-light);
    font-weight: 600;
    transform: translateX(4px);
}

#toc-container .toc-item.active::before {
    transform: scaleY(1);
    opacity: 1;
}

[data-theme="dark"] #toc-container .toc-item.active {
    background: rgba(59, 130, 246, 0.15);
    color: #60a5fa;
}

#toc-container .toc-item.indent {
    padding-left: 24px;
    font-size: 0.8rem;
}

/* ==========================================================================
   READING PROGRESS BAR (ANIMATED SHIMMER)
   ========================================================================== */

#reading-progress-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: transparent;
    z-index: 9999;
}

#reading-progress {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #2563eb, #8b5cf6, #ec4899, #3b82f6);
    background-size: 300% 100%;
    animation: progressGlow 4s ease infinite;
    transition: width 0.08s linear !important;
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.7);
}

@keyframes progressGlow {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* ==========================================================================
   ZEN / FOCUS MODE
   ========================================================================== */

body.focus-mode #sidebar,
body.focus-mode #right-sidebar {
    opacity: 0;
    pointer-events: none;
    width: 0 !important;
    padding: 0 !important;
    overflow: hidden;
    border: none;
}

body.focus-mode #main-content {
    max-width: 860px;
    margin: 0 auto;
}

/* Tooltip for keyboard shortcuts */
.kbd-shortcut {
    display: inline-block;
    padding: 2px 6px;
    font-size: 0.7rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
    background: var(--bg-body);
    border: 1px solid var(--border);
    border-radius: 4px;
    margin-left: 6px;
    vertical-align: middle;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
    width: 7px;
    height: 7px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
    transition: background 0.2s;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

#nav-menu::-webkit-scrollbar { display: none; }
#nav-menu { -ms-overflow-style: none; scrollbar-width: none; }

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

.mobile-header { display: none; }

@media (min-width: 901px) {
    #sidebar {
        position: sticky !important;
        top: 0 !important;
        height: 100vh !important;
        overflow-y: auto !important;
        align-self: flex-start;
    }
    
    #right-sidebar {
        position: sticky !important;
        top: 0 !important;
        height: 100vh !important;
        overflow-y: auto !important;
        align-self: flex-start;
    }
}

@media (max-width: 1280px) {
    #right-sidebar { display: none !important; }
    #main-content { max-width: 900px; margin: 0 auto; }
}

@media (max-width: 900px) {
    body {
        flex-direction: column !important;
        overflow-x: hidden !important;
    }

    #right-sidebar {
        display: none !important;
    }

    .mobile-header {
        display: flex !important;
        justify-content: space-between;
        align-items: center;
        padding: 12px 18px;
        background: var(--bg-card);
        border-bottom: 1px solid var(--border);
        position: sticky;
        top: 0;
        z-index: 1000;
        box-sizing: border-box;
        width: 100%;
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
    }

    .menu-btn {
        background: none;
        border: 1px solid var(--border);
        font-size: 1.3rem;
        color: var(--text-main);
        cursor: pointer;
        padding: 4px 10px;
        border-radius: 8px;
        background: var(--bg-body);
        transition: all 0.2s;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .menu-btn:hover {
        background: var(--border);
        color: var(--primary);
    }

    #sidebar { 
        position: fixed !important; 
        left: -350px; 
        top: 0; 
        bottom: 0; 
        height: 100vh;
        width: min(320px, 86vw) !important; 
        max-width: 340px;
        z-index: 2000; 
        transition: left 0.32s cubic-bezier(0.16, 1, 0.3, 1) !important;
        display: flex !important;
        flex-direction: column;
        box-shadow: 0 0 35px rgba(0, 0, 0, 0.3);
        background: var(--bg-sidebar);
        padding: 12px 14px 24px 14px;
        box-sizing: border-box;
    }

    #sidebar.open {
        left: 0 !important;
    }

    #sidebar .brand {
        display: flex !important;
        align-items: center;
        padding: 8px 6px 14px 6px;
        margin-bottom: 12px;
        border-bottom: 1px solid var(--border);
        font-size: 0.95rem;
    }

    #sidebar .brand span {
        flex: 1;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
        font-weight: 700;
    }

    .sidebar-close-btn {
        display: flex !important;
        align-items: center;
        justify-content: center;
        width: 32px;
        height: 32px;
        border-radius: 8px;
        border: 1px solid var(--border);
        background: var(--bg-body);
        color: var(--text-main);
        cursor: pointer;
        margin-left: 8px;
        transition: all 0.2s;
        flex-shrink: 0;
    }

    .sidebar-close-btn:hover {
        background: var(--border);
        color: #ef4444;
        transform: scale(1.05);
    }

    .search-box {
        padding: 0 2px 14px 2px;
    }

    .search-box input {
        padding-right: 14px !important;
        font-size: 0.85rem;
    }

    .search-badge {
        display: none !important;
    }

    .nav-item {
        padding: 9px 12px;
        font-size: 0.875rem;
        line-height: 1.35;
    }

    #main-content { 
        padding: 20px 14px; 
        width: 100%; 
        max-width: 100%; 
        margin: 0; 
        box-sizing: border-box;
    }

    .article-container {
        padding: 20px 16px 60px;
        margin: 0 auto;
        box-sizing: border-box;
        width: 100%;
        max-width: 100%;
        border-radius: 12px;
    }
    
    /* Overlay for mobile sidebar */
    body.sidebar-open::after {
        content: '';
        position: fixed;
        top: 0; left: 0; right: 0; bottom: 0;
        background: rgba(0, 0, 0, 0.55);
        backdrop-filter: blur(5px);
        -webkit-backdrop-filter: blur(5px);
        z-index: 1999;
        animation: fadeIn 0.25s ease forwards;
    }

    @keyframes fadeIn {
        from { opacity: 0; }
        to { opacity: 1; }
    }
    
    .markdown-body h1 { font-size: 1.85rem; }
    .markdown-body h2 { font-size: 1.4rem; }
    .markdown-body h3 { font-size: 1.15rem; }
    .heading-anchor { display: none !important; }
}

@media (max-width: 480px) {
    .markdown-body { font-size: 0.95rem; }
    .markdown-body pre code { padding: 14px; font-size: 0.8rem; }
}

/* Print Styles */
@media print {
    #sidebar, #right-sidebar, .mobile-header, #reading-progress-container {
        display: none !important;
    }
    #main-content { padding: 0 !important; max-width: 100% !important; margin: 0 !important; }
    body, .markdown-body { background: white !important; color: black !important; font-size: 12pt; }
    .markdown-body a { text-decoration: underline; color: black; }
    .markdown-body pre { border: 1px solid #ccc !important; page-break-inside: avoid; }
}

/* ==========================================================================
   SPOTLIGHT SEARCH MODAL (Ctrl + K)
   ========================================================================== */

#spotlight-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(15, 23, 42, 0.65);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 10000;
    display: none;
    align-items: flex-start;
    justify-content: center;
    padding-top: 12vh;
    opacity: 0;
    transition: opacity 0.2s cubic-bezier(0.16, 1, 0.3, 1) !important;
}

#spotlight-modal.show {
    display: flex;
    opacity: 1;
}

.spotlight-card {
    width: 90%;
    max-width: 640px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3), 0 0 0 1px var(--border);
    overflow: hidden;
    transform: scale(0.96) translateY(-10px);
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.3s !important;
}

#spotlight-modal.show .spotlight-card {
    transform: scale(1) translateY(0);
}

.spotlight-header {
    display: flex;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    gap: 12px;
}

.spotlight-header svg {
    width: 20px;
    height: 20px;
    color: var(--primary);
    flex-shrink: 0;
}

.spotlight-input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 1.05rem;
    color: var(--text-main);
    outline: none;
    font-family: var(--font-sans);
}

.spotlight-esc {
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
    background: var(--bg-body);
    border: 1px solid var(--border);
    padding: 3px 7px;
    border-radius: 6px;
}

.spotlight-results {
    max-height: 400px;
    overflow-y: auto;
    padding: 10px;
}

.spotlight-empty {
    padding: 36px 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.spotlight-item {
    display: block;
    padding: 12px 16px;
    border-radius: 10px;
    text-decoration: none;
    margin-bottom: 4px;
    border: 1px solid transparent;
    transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1) !important;
}

.spotlight-item:hover,
.spotlight-item.selected {
    background: var(--bg-body);
    border-color: var(--border);
    transform: translateX(3px);
}

.spotlight-item.selected {
    border-color: var(--primary);
    box-shadow: 0 0 0 1px var(--primary);
}

.spotlight-item-badge {
    font-size: 0.7rem;
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--primary);
    margin-bottom: 4px;
}

.spotlight-item-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 3px;
}

.spotlight-item-snippet {
    font-size: 0.825rem;
    color: var(--text-muted);
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.spotlight-item mark {
    background: rgba(37, 99, 235, 0.2);
    color: var(--primary);
    border-radius: 3px;
    padding: 1px 3px;
    font-weight: 600;
}

.spotlight-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 18px;
    background: var(--bg-body);
    border-top: 1px solid var(--border);
    font-size: 0.775rem;
    color: var(--text-muted);
}

.spotlight-footer-keys {
    display: flex;
    gap: 12px;
}

/* Search Shortcut Badge in Sidebar */
.search-badge {
    position: absolute;
    right: 12px;
    top: 9px;
    font-size: 0.675rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 2px 5px;
    border-radius: 4px;
    pointer-events: none;
}

/* ==========================================================================
   NEXT / PREVIOUS ARTICLE NAVIGATION
   ========================================================================== */

.post-navigation {
    display: flex;
    gap: 16px;
    margin-top: 60px;
    padding-top: 30px;
    border-top: 1px solid var(--border);
}

.post-nav-card {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 18px 22px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    text-decoration: none;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1) !important;
}

.post-nav-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px var(--primary-glow);
}

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

.post-nav-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--primary);
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.post-nav-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.4;
}

@media (max-width: 640px) {
    .post-navigation {
        flex-direction: column;
    }
    .post-nav-card.next {
        text-align: left;
        align-items: flex-start;
    }
}

/* ==========================================================================
   BACK TO TOP BUTTON (WITH CIRCULAR SCROLL PROGRESS)
   ========================================================================== */

#back-to-top {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-main);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 900;
    opacity: 0;
    visibility: hidden;
    transform: scale(0.8) translateY(10px);
    transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
}

#back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: scale(1) translateY(0);
}

#back-to-top:hover {
    background: var(--bg-card);
    color: var(--primary);
    border-color: var(--primary);
    transform: scale(1.1) translateY(-2px);
    box-shadow: 0 8px 24px var(--primary-glow);
}

#back-to-top:active {
    transform: scale(0.95);
}

#back-to-top .progress-ring {
    position: absolute;
    top: 0;
    left: 0;
    width: 48px;
    height: 48px;
    transform: rotate(-90deg);
    pointer-events: none;
}

#back-to-top .progress-ring__circle-bg {
    stroke: var(--border);
    stroke-width: 2.5;
    fill: transparent;
}

#back-to-top .progress-ring__circle {
    stroke: var(--primary);
    stroke-width: 2.5;
    stroke-linecap: round;
    fill: transparent;
    transition: stroke-dashoffset 0.08s linear;
}

#back-to-top .back-to-top-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
    transition: transform 0.2s ease;
}

#back-to-top:hover .back-to-top-arrow {
    transform: translateY(-2px);
}

/* ==========================================================================
   CODE BLOCK ACTION BUTTONS (WRAP, EXPAND, COPY)
   ========================================================================== */

.code-wrap-toggle,
.code-expand-toggle {
    background: var(--bg-body);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--mac-header-text);
    font-family: var(--font-mono);
    font-size: 0.725rem;
    padding: 3px 8px;
    cursor: pointer;
    margin-right: 6px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1) !important;
}

.code-wrap-toggle:hover,
.code-expand-toggle:hover {
    background: var(--border);
    color: var(--text-main);
    transform: translateY(-1px);
}

.code-wrap-toggle.active,
.code-expand-toggle.active {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
}

.code-wrapped pre code {
    white-space: pre-wrap !important;
    word-break: break-word !important;
}

/* ==========================================================================
   DEDICATED FULLSCREEN CODE MODAL
   ========================================================================== */

#code-expand-modal {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    background: rgba(15, 23, 42, 0.78) !important;
    backdrop-filter: blur(12px) !important;
    -webkit-backdrop-filter: blur(12px) !important;
    z-index: 20000 !important;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 3vh 4vw;
    opacity: 0;
    transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1) !important;
}

#code-expand-modal.show {
    display: flex !important;
    opacity: 1 !important;
}

.code-modal-card {
    width: 100%;
    max-width: 1200px;
    height: 86vh;
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 14px;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.55), 0 0 0 1px var(--border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: scale(0.96) translateY(8px);
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.3s !important;
}

#code-expand-modal.show .code-modal-card {
    transform: scale(1) translateY(0);
}

.code-modal-card .mac-window-header {
    background: var(--mac-header-bg);
    padding: 10px 18px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.code-modal-close-btn {
    background: var(--bg-body);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--mac-header-text);
    font-family: var(--font-mono);
    font-size: 0.725rem;
    padding: 3px 10px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1) !important;
}

.code-modal-close-btn:hover {
    background: #ef4444 !important;
    color: #ffffff !important;
    border-color: #ef4444 !important;
    transform: translateY(-1px);
}

.code-modal-body {
    flex: 1;
    overflow: auto;
    background: var(--code-bg);
}

.code-modal-body pre {
    margin: 0 !important;
    padding: 24px !important;
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    border-radius: 0 !important;
    min-height: 100%;
    transform: none !important;
}

.code-modal-body code {
    font-family: var(--font-mono) !important;
    font-size: 0.95rem !important;
    line-height: 1.65 !important;
    color: var(--code-text) !important;
    background: transparent !important;
    border: none !important;
    padding: 0 !important;
    white-space: pre;
}

.code-modal-card.code-wrapped .code-modal-body code {
    white-space: pre-wrap !important;
    word-break: break-word !important;
}

body.code-modal-open {
    overflow: hidden !important;
}

/* ==========================================================================
   ARTICLE METADATA BAR (READING TIME, WORD COUNT & QUICK ACTIONS)
   ========================================================================== */

.article-meta-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    padding: 10px 18px;
    margin-top: 14px;
    margin-bottom: 36px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    font-size: 0.825rem;
    color: var(--text-muted);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
    animation: fadeIn 0.35s ease;
}

.meta-badge,
.reading-time-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    color: var(--text-muted);
}

.meta-badge strong,
.reading-time-pill strong {
    color: var(--text-main);
    font-weight: 600;
}

.meta-badge svg,
.reading-time-pill svg {
    width: 15px;
    height: 15px;
    color: var(--primary);
    flex-shrink: 0;
}

.meta-divider {
    width: 1px;
    height: 16px;
    background-color: var(--border);
}

.meta-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 8px;
}

.meta-btn,
.share-article-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--bg-body);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 0.775rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: var(--font-sans);
    user-select: none;
    outline: none;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

[data-theme="dark"] .meta-btn,
[data-theme="dark"] .share-article-btn {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.12);
    color: #e2e8f0;
}

.meta-btn svg,
.share-article-btn svg {
    width: 13px;
    height: 13px;
    color: var(--primary);
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), color 0.2s ease;
    flex-shrink: 0;
}

.meta-btn:hover,
.share-article-btn:hover {
    background: var(--primary) !important;
    border-color: var(--primary) !important;
    color: #ffffff !important;
    transform: translateY(-1.5px);
    box-shadow: 0 4px 12px var(--primary-glow);
}

.meta-btn:hover svg,
.share-article-btn:hover svg {
    color: #ffffff !important;
    transform: scale(1.15) rotate(-8deg);
}

.meta-btn:active,
.share-article-btn:active {
    transform: translateY(0) scale(0.96);
}

/* Copied Success state for share button */
.share-article-btn.copied {
    background: #10b981 !important;
    border-color: #10b981 !important;
    color: #ffffff !important;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.35) !important;
}

.share-article-btn.copied svg {
    color: #ffffff !important;
    transform: scale(1.15);
}

@media (max-width: 600px) {
    .meta-actions {
        margin-left: 0;
        width: 100%;
        justify-content: flex-start;
        padding-top: 8px;
        border-top: 1px solid var(--border);
    }
}

/* ==========================================================================
   GLOBAL TOAST NOTIFICATIONS
   ========================================================================== */

#toast-container {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    z-index: 10008;
    pointer-events: none;
}

.toast-message {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--bg-card);
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 10px 18px;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.18), 0 0 0 1px var(--border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    pointer-events: auto;
    opacity: 0;
    transform: translateY(16px) scale(0.94);
    transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

.toast-message.show {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.toast-message.hide {
    opacity: 0;
    transform: translateY(-10px) scale(0.94);
}

.toast-icon {
    width: 18px;
    height: 18px;
    color: #10b981;
    flex-shrink: 0;
}

/* ==========================================================================
   CALLOUTS / ADMONITIONS (GITHUB & VITEPRESS STYLE)
   ========================================================================== */

.callout {
    margin: 1.8em 0;
    padding: 14px 18px;
    border-radius: 10px;
    border-left: 4px solid var(--primary);
    background: var(--bg-card);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.callout:hover {
    transform: translateX(3px);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.04);
}

.callout-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 0.875rem;
    margin-bottom: 8px;
    letter-spacing: 0.03em;
}

.callout-title svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

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

.callout-note {
    border-left-color: #3b82f6;
    background: rgba(59, 130, 246, 0.06);
}
.callout-note .callout-title { color: #3b82f6; }

.callout-tip {
    border-left-color: #10b981;
    background: rgba(16, 185, 129, 0.06);
}
.callout-tip .callout-title { color: #10b981; }

.callout-warning {
    border-left-color: #f59e0b;
    background: rgba(245, 158, 11, 0.06);
}
.callout-warning .callout-title { color: #f59e0b; }

.callout-important, 
.callout-caution {
    border-left-color: #ef4444;
    background: rgba(239, 68, 68, 0.06);
}
.callout-important .callout-title, 
.callout-caution .callout-title { color: #ef4444; }

/* ==========================================================================
   IMAGE & DIAGRAM LIGHTBOX (ZOOM ON CLICK)
   ========================================================================== */

#image-lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 10006;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    cursor: zoom-out;
}

#image-lightbox.show {
    display: flex;
    opacity: 1;
}

#image-lightbox img {
    max-width: 92vw;
    max-height: 88vh;
    border-radius: 12px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    transform: scale(0.92);
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    object-fit: contain;
}

#image-lightbox.show img {
    transform: scale(1);
}

.markdown-body img {
    cursor: zoom-in;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    border-radius: 8px;
}

.markdown-body img:hover {
    transform: scale(1.01);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

/* ==========================================================================
   KEYBOARD SHORTCUTS CHEATSHEET MODAL & HELPER BUTTON
   ========================================================================== */

#kbd-shortcuts-btn {
    position: fixed;
    bottom: 28px;
    left: 28px;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    font-family: var(--font-mono);
    cursor: pointer;
    z-index: 850;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

#kbd-shortcuts-btn:hover {
    color: var(--primary);
    border-color: var(--primary);
    transform: scale(1.1) translateY(-1px);
    box-shadow: 0 6px 16px var(--primary-glow);
}

#kbd-shortcuts-btn:active {
    transform: scale(0.95);
}

#kbd-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(15, 23, 42, 0.65);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 10007;
    display: none;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

#kbd-modal.show {
    display: flex;
    opacity: 1;
}

.kbd-modal-card {
    width: 90%;
    max-width: 480px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    transform: scale(0.95);
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

#kbd-modal.show .kbd-modal-card {
    transform: scale(1);
}

.kbd-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-main);
}

.kbd-grid {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 16px;
}

.kbd-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: var(--text-main);
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
}

.kbd-row:last-child {
    border-bottom: none;
}

.kbd-key-group {
    display: flex;
    gap: 4px;
}

.kbd-key-group kbd {
    background: var(--bg-body);
    border: 1px solid var(--border);
    padding: 3px 8px;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.775rem;
    font-weight: 600;
    color: var(--text-muted);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

/* ==========================================================================
   RIPPLE EFFECT & SCROLL REVEAL
   ========================================================================== */

.has-ripple {
    position: relative;
    overflow: hidden;
}

.ripple-wave {
    position: absolute;
    border-radius: 50%;
    background: var(--primary-glow);
    transform: scale(0);
    animation: rippleAnim 0.55s ease-out;
    pointer-events: none;
}

@keyframes rippleAnim {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

.reveal-on-scroll {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 0.45s cubic-bezier(0.16, 1, 0.3, 1), transform 0.45s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}

.reveal-on-scroll.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================================
   11. ADVANCED UI EFFECTS & MICRO-INTERACTIONS
   ========================================================================== */

/* --- VIEW TRANSITION API (CIRCULAR THEME WIPE) --- */
::view-transition-old(root),
::view-transition-new(root) {
    animation: none;
    mix-blend-mode: normal;
}
::view-transition-old(root) {
    z-index: 1;
}
::view-transition-new(root) {
    z-index: 9999;
}
[data-theme="dark"]::view-transition-old(root) {
    z-index: 9999;
}
[data-theme="dark"]::view-transition-new(root) {
    z-index: 1;
}

/* --- TARGET HEADING HIGHLIGHT PULSE --- */
.heading-target-pulse {
    animation: targetHeadingPulse 1.8s cubic-bezier(0.16, 1, 0.3, 1) forwards !important;
    border-radius: 8px;
    padding-left: 8px !important;
    margin-left: -8px !important;
}

@keyframes targetHeadingPulse {
    0% {
        background-color: transparent;
        box-shadow: 0 0 0 0 transparent;
        transform: translateX(0);
    }
    18% {
        background-color: var(--primary-light);
        box-shadow: -6px 0 0 0 var(--primary), 0 0 20px var(--primary-glow);
        transform: translateX(6px);
    }
    65% {
        background-color: var(--primary-light);
        box-shadow: -6px 0 0 0 var(--primary), 0 0 16px var(--primary-glow);
        transform: translateX(6px);
    }
    100% {
        background-color: transparent;
        box-shadow: 0 0 0 0 transparent;
        transform: translateX(0);
    }
}

/* --- MOUSE-TRACKING SPOTLIGHT / BORDER GLOW --- */
.spotlight-card-hover {
    position: relative;
    overflow: hidden;
}

.spotlight-card-hover::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: inherit;
    background: radial-gradient(350px circle at var(--mouse-x, -999px) var(--mouse-y, -999px), var(--primary-glow), transparent 70%);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1;
}

.spotlight-card-hover:hover::after {
    opacity: 1;
}

/* --- TABLE OF CONTENTS (TOC) DYNAMIC GLIDER & READING PROGRESS --- */
#toc-container {
    position: relative;
}

.toc-title-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.toc-progress-pill {
    font-size: 0.68rem;
    font-family: var(--font-mono);
    font-weight: 600;
    padding: 2px 7px;
    border-radius: 999px;
    background: var(--primary-light);
    color: var(--primary);
    border: 1px solid rgba(37, 99, 235, 0.2);
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] .toc-progress-pill {
    background: rgba(59, 130, 246, 0.15);
    color: #60a5fa;
    border-color: rgba(59, 130, 246, 0.3);
}

.toc-glider {
    position: absolute;
    left: 0;
    width: 3px;
    height: 28px;
    background: linear-gradient(180deg, var(--primary), #8b5cf6);
    border-radius: 4px;
    box-shadow: 0 0 10px var(--primary);
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), height 0.2s ease, opacity 0.2s ease;
    pointer-events: none;
    opacity: 0;
    z-index: 2;
}

.toc-glider.visible {
    opacity: 1;
}

/* --- STICKY GLASS FLOATING TOPBAR --- */
.sticky-topbar {
    position: fixed;
    top: 0;
    left: 280px;
    right: 260px;
    height: 52px;
    background: rgba(255, 255, 255, 0.82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 950;
    transform: translateY(-100%);
    opacity: 0;
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease, background-color 0.3s;
    pointer-events: none;
}

[data-theme="dark"] .sticky-topbar {
    background: rgba(15, 23, 42, 0.85);
}

.sticky-topbar.visible {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
}

body.focus-mode .sticky-topbar {
    left: 0;
    right: 0;
}

@media (max-width: 1280px) {
    .sticky-topbar { right: 0; }
}

@media (max-width: 900px) {
    .sticky-topbar { display: none !important; }
}

.sticky-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.825rem;
    color: var(--text-muted);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 60%;
}

.sticky-breadcrumb .crumb-sep {
    color: var(--border);
}

.sticky-breadcrumb .crumb-title {
    color: var(--text-main);
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sticky-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.sticky-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 10px;
    border-radius: 7px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.775rem;
    font-weight: 500;
    cursor: pointer;
    font-family: var(--font-sans);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.sticky-btn:hover {
    background: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary);
    transform: translateY(-1px);
    box-shadow: 0 2px 6px var(--primary-glow);
}

/* --- FONT SIZE ADJUSTER --- */
body[data-font-size="sm"] .markdown-body { font-size: 0.95rem; }
body[data-font-size="sm"] .markdown-body p,
body[data-font-size="sm"] .markdown-body li { font-size: 0.925rem; line-height: 1.65; }

body[data-font-size="md"] .markdown-body { font-size: 1.05rem; }
body[data-font-size="md"] .markdown-body p,
body[data-font-size="md"] .markdown-body li { font-size: 1rem; line-height: 1.75; }

body[data-font-size="lg"] .markdown-body { font-size: 1.15rem; }
body[data-font-size="lg"] .markdown-body p,
body[data-font-size="lg"] .markdown-body li { font-size: 1.1rem; line-height: 1.85; }

.font-size-group {
    display: inline-flex;
    border-radius: 7px;
    border: 1px solid var(--border);
    overflow: hidden;
    background: var(--bg-card);
}

.font-size-btn {
    border: none;
    background: transparent;
    padding: 3px 8px;
    font-size: 0.75rem;
    color: var(--text-muted);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.15s ease;
}

.font-size-btn:hover {
    color: var(--text-main);
    background: var(--border);
}

.font-size-btn.active {
    background: var(--primary);
    color: #ffffff;
}

/* --- CLICK-TO-COPY INLINE CODE --- */
.interactive-inline-code {
    cursor: pointer !important;
    position: relative;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1) !important;
}

.interactive-inline-code:hover {
    border-color: var(--primary) !important;
    background-color: var(--primary-light) !important;
    color: var(--primary) !important;
    transform: translateY(-1px);
    box-shadow: 0 2px 6px var(--primary-glow);
}

.interactive-inline-code:active {
    transform: scale(0.95);
}

.interactive-inline-code.code-copied {
    border-color: #10b981 !important;
    background-color: rgba(16, 185, 129, 0.15) !important;
    color: #10b981 !important;
}

/* --- SPOTLIGHT SEARCH QUICK TAGS --- */
.spotlight-quick-tags {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
    padding: 10px 18px;
    border-bottom: 1px solid var(--border);
    background: rgba(0, 0, 0, 0.015);
}

.spotlight-tag-label {
    font-size: 0.725rem;
    color: var(--text-muted);
    font-weight: 600;
    margin-right: 4px;
}

.spotlight-tag-pill {
    font-size: 0.725rem;
    padding: 3px 9px;
    border-radius: 999px;
    background: var(--bg-body);
    border: 1px solid var(--border);
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.18s cubic-bezier(0.16, 1, 0.3, 1);
    font-family: var(--font-sans);
    font-weight: 500;
}

.spotlight-tag-pill:hover {
    background: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary);
    transform: translateY(-1px);
    box-shadow: 0 2px 6px var(--primary-glow);
}

/* --- BACK-TO-TOP PERCENTAGE DISPLAY --- */
#back-to-top .back-to-top-percent {
    position: absolute;
    font-size: 0.65rem;
    font-family: var(--font-mono);
    font-weight: 700;
    color: var(--primary);
    opacity: 0;
    transform: scale(0.6);
    transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
    pointer-events: none;
    z-index: 3;
}

#back-to-top:hover .back-to-top-arrow {
    opacity: 0;
    transform: translateY(-6px);
}

#back-to-top:hover .back-to-top-percent {
    opacity: 1;
    transform: scale(1);
}

/* --- TABLE SCROLL CONTAINER --- */
.table-scroll-wrapper {
    position: relative;
    width: 100%;
    margin: 2em 0;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
}

.table-scroll-wrapper .table-inner {
    overflow-x: auto;
    overflow-y: hidden;
    width: 100%;
    -webkit-overflow-scrolling: touch;
}

.table-scroll-wrapper table {
    margin: 0 !important;
    border: none !important;
    width: 100%;
}

.table-scroll-wrapper table th {
    border-top: none;
}

.table-scroll-wrapper table tr:last-child td {
    border-bottom: none;
}

/* --- CODE BLOCK LANGUAGE BADGES WITH SPECIALIZED ACCENTS --- */
.code-lang-label[data-lang="cpp"],
.code-lang-label[data-lang="c++"],
.code-lang-label[data-lang="c"] {
    color: #60a5fa !important;
    font-weight: 700;
}

.code-lang-label[data-lang="python"],
.code-lang-label[data-lang="py"] {
    color: #fbbf24 !important;
    font-weight: 700;
}

.code-lang-label[data-lang="bash"],
.code-lang-label[data-lang="sh"],
.code-lang-label[data-lang="shell"] {
    color: #34d399 !important;
    font-weight: 700;
}

.code-lang-label[data-lang="asm"],
.code-lang-label[data-lang="assembly"] {
    color: #f472b6 !important;
    font-weight: 700;
}

/* ==========================================================================
   TOP LOADING PROGRESS BAR (YOUTUBE / LINEAR STYLE)
   ========================================================================== */

#top-loading-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0%;
    background: linear-gradient(90deg, #2563eb, #38bdf8, #818cf8, #a855f7);
    background-size: 200% 100%;
    animation: topBarShimmer 1.4s linear infinite;
    z-index: 999999;
    pointer-events: none;
    opacity: 0;
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.7), 0 0 4px #2563eb;
    border-radius: 0 2px 2px 0;
    transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s ease;
}

@keyframes topBarShimmer {
    0% { background-position: 100% 0; }
    100% { background-position: -100% 0; }
}

/* ==========================================================================
   VIEW TRANSITIONS & ULTRA-SMOOTH SPA MORPHING
   ========================================================================== */

::view-transition-group(article-body) {
    animation-duration: 0.32s;
    animation-timing-function: cubic-bezier(0.16, 1, 0.3, 1);
}

::view-transition-old(article-body) {
    animation: 0.2s cubic-bezier(0.16, 1, 0.3, 1) both pageFadeOut;
}

::view-transition-new(article-body) {
    animation: 0.3s cubic-bezier(0.16, 1, 0.3, 1) both pageFadeIn;
}

@keyframes pageFadeOut {
    0% { opacity: 1; transform: translateY(0) scale(1); filter: blur(0px); }
    100% { opacity: 0; transform: translateY(-8px) scale(0.995); filter: blur(2px); }
}

@keyframes pageFadeIn {
    0% { opacity: 0; transform: translateY(12px) scale(0.995); filter: blur(2px); }
    100% { opacity: 1; transform: translateY(0) scale(1); filter: blur(0px); }
}

.article-container {
    view-transition-name: article-body;
}

/* Isolate static UI elements ONLY during SPA navigation (not theme switch) */
html.spa-navigating #sidebar {
    view-transition-name: sidebar-panel;
}
html.spa-navigating .sticky-topbar {
    view-transition-name: topbar-panel;
}
html.spa-navigating #right-sidebar {
    view-transition-name: rightsidebar-panel;
}

/* Keep static elements frozen (no animation) during SPA transitions */
::view-transition-old(sidebar-panel),
::view-transition-new(sidebar-panel),
::view-transition-old(topbar-panel),
::view-transition-new(topbar-panel),
::view-transition-old(rightsidebar-panel),
::view-transition-new(rightsidebar-panel) {
    animation: none;
}

/* SPA View Transition - article body slide animation */
@keyframes spa-slide-out {
    from { opacity: 1; transform: translateY(0); filter: blur(0); }
    to   { opacity: 0; transform: translateY(-12px); filter: blur(2px); }
}
@keyframes spa-slide-in {
    from { opacity: 0; transform: translateY(16px); filter: blur(2px); }
    to   { opacity: 1; transform: translateY(0); filter: blur(0); }
}
::view-transition-old(article-body) {
    animation: spa-slide-out 0.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
::view-transition-new(article-body) {
    animation: spa-slide-in 0.32s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.article-container.page-transition-exit {
    opacity: 0 !important;
    transform: translateY(-8px) scale(0.995) !important;
    filter: blur(2px);
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1) !important;
}

.article-container.page-transition-enter {
    animation: pageReveal 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Smooth typography & font-size transitions */
.markdown-body {
    transition: font-size 0.25s cubic-bezier(0.16, 1, 0.3, 1), 
                line-height 0.25s cubic-bezier(0.16, 1, 0.3, 1) !important;
}

/* Smooth Post Nav Card hover lift & glowing border */
.post-nav-card {
    transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1),
                box-shadow 0.28s cubic-bezier(0.16, 1, 0.3, 1),
                border-color 0.28s cubic-bezier(0.16, 1, 0.3, 1),
                background-color 0.35s cubic-bezier(0.16, 1, 0.3, 1) !important;
}

.post-nav-card:hover {
    transform: translateY(-4px) scale(1.008) !important;
    border-color: var(--primary) !important;
    box-shadow: 0 14px 30px rgba(37, 99, 235, 0.12), 0 0 0 1px var(--primary) !important;
}

.post-nav-card.prev:hover .post-nav-label svg {
    transform: translateX(-4px);
}

.post-nav-card.next:hover .post-nav-label svg {
    transform: translateX(4px);
}

.post-nav-label svg {
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
}

/* Smooth Callout hover */
.callout {
    transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1),
                box-shadow 0.28s cubic-bezier(0.16, 1, 0.3, 1),
                border-color 0.35s cubic-bezier(0.16, 1, 0.3, 1),
                background-color 0.35s cubic-bezier(0.16, 1, 0.3, 1) !important;
}

.callout:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

/* Smooth Code Block hover */
.markdown-body pre {
    transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1),
                box-shadow 0.28s cubic-bezier(0.16, 1, 0.3, 1),
                border-color 0.35s cubic-bezier(0.16, 1, 0.3, 1),
                background-color 0.35s cubic-bezier(0.16, 1, 0.3, 1) !important;
}

.markdown-body pre:hover {
    box-shadow: 0 8px 26px rgba(0, 0, 0, 0.07);
}

.mac-dot {
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.2s ease !important;
}

.mac-dot:hover {
    transform: scale(1.22);
    filter: brightness(1.15);
}

/* Smooth Anchor & TOC transitions */
.heading-anchor {
    transition: opacity 0.22s cubic-bezier(0.16, 1, 0.3, 1), 
                transform 0.22s cubic-bezier(0.16, 1, 0.3, 1), 
                color 0.2s ease !important;
}

.toc-item {
    transition: color 0.2s cubic-bezier(0.16, 1, 0.3, 1), 
                transform 0.2s cubic-bezier(0.16, 1, 0.3, 1) !important;
}

.toc-item:hover {
    transform: translateX(3px);
}

/* ==========================================================================
   MODERN VISUAL DIAGRAM CARDS & MEMORY ARCHITECTURE COMPONENTS
   ========================================================================== */

.visual-diagram-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 24px;
    margin: 2em 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s ease, border-color 0.25s ease;
}

.visual-diagram-card:hover {
    border-color: var(--primary);
    box-shadow: 0 8px 30px rgba(37, 99, 235, 0.08);
}

.diagram-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px dashed var(--border);
    flex-wrap: wrap;
}

.diagram-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

.diagram-badge {
    font-size: 0.725rem;
    font-family: var(--font-mono);
    font-weight: 600;
    padding: 3px 9px;
    border-radius: 999px;
    letter-spacing: 0.02em;
}

.badge-blue { background: rgba(37, 99, 235, 0.12); color: #2563eb; border: 1px solid rgba(37, 99, 235, 0.25); }
.badge-green { background: rgba(16, 185, 129, 0.12); color: #10b981; border: 1px solid rgba(16, 185, 129, 0.25); }
.badge-purple { background: rgba(139, 92, 246, 0.12); color: #8b5cf6; border: 1px solid rgba(139, 92, 246, 0.25); }
.badge-rose { background: rgba(244, 63, 94, 0.12); color: #f43f5e; border: 1px solid rgba(244, 63, 94, 0.25); }
.badge-amber { background: rgba(245, 158, 11, 0.12); color: #f59e0b; border: 1px solid rgba(245, 158, 11, 0.25); }

[data-theme="dark"] .badge-blue { color: #60a5fa; border-color: rgba(96, 165, 250, 0.3); }
[data-theme="dark"] .badge-green { color: #34d399; border-color: rgba(52, 211, 153, 0.3); }
[data-theme="dark"] .badge-purple { color: #c084fc; border-color: rgba(192, 132, 252, 0.3); }
[data-theme="dark"] .badge-rose { color: #fb7185; border-color: rgba(251, 113, 133, 0.3); }
[data-theme="dark"] .badge-amber { color: #fbbf24; border-color: rgba(251, 191, 36, 0.3); }

/* --- MEMORY MAPPING (Virtual Page to Physical Frame) --- */
.memory-mapping-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.memory-tier {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.tier-title-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
}

.tier-blocks-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.tier-blocks-row.scatter {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.tier-blocks-row.scatter .mem-block {
    flex: 1;
}

.mem-scatter-gap {
    padding: 0 12px;
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: #f43f5e;
    font-weight: 600;
    white-space: nowrap;
    text-align: center;
    opacity: 0.85;
}

.mem-block {
    padding: 14px 16px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--bg-body);
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mem-block.v-page {
    border-color: rgba(37, 99, 235, 0.3);
    background: rgba(37, 99, 235, 0.03);
}

.mem-block.p-frame {
    border-color: rgba(244, 63, 94, 0.3);
    background: rgba(244, 63, 94, 0.03);
}

.mem-block:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.block-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
}

.block-title {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-main);
    font-family: var(--font-mono);
}

.block-detail {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--font-sans);
}

.mapping-flow-divider {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    padding: 4px 0;
}

.mapping-arrow-col {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    color: var(--primary);
    font-size: 0.725rem;
    font-weight: 600;
}

.mapping-arrow-col svg {
    animation: bounceDown 1.8s infinite ease-in-out;
}

@keyframes bounceDown {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(4px); }
}

/* --- MALLOC ARCHITECTURE 3-TIER FLOW --- */
.arch-flow-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.arch-layer {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 18px;
    border-radius: 10px;
    background: var(--bg-body);
    border: 1px solid var(--border);
    transition: all 0.2s ease;
}

.arch-layer:hover {
    transform: translateX(4px);
    border-color: var(--primary);
}

.arch-layer-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.arch-layer-body {
    flex: 1;
}

.arch-layer-title {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-main);
}

.arch-layer-sub {
    font-size: 0.775rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.arch-connector-bridge {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    font-size: 0.75rem;
    color: var(--primary);
    font-weight: 600;
}

/* --- CHUNK HEADER MEMORY LAYOUT --- */
.chunk-layout-bar {
    display: flex;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--border);
    margin-top: 14px;
    height: 56px;
}

.chunk-segment {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 6px 12px;
    text-align: center;
    transition: all 0.2s ease;
    border-right: 1px solid rgba(255, 255, 255, 0.1);
}

.chunk-segment.meta {
    flex: 0 0 30%;
    background: rgba(99, 102, 241, 0.15);
    border-right: 2px dashed rgba(99, 102, 241, 0.4);
}

.chunk-segment.data {
    flex: 1;
    background: rgba(16, 185, 129, 0.15);
}

.chunk-segment-name {
    font-size: 0.775rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--text-main);
}

.chunk-segment-sub {
    font-size: 0.675rem;
    color: var(--text-muted);
}

/* --- MESI INTERACTIVE STEP TIMELINE --- */
.mesi-step-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.mesi-step-item {
    display: flex;
    gap: 14px;
    padding: 14px 18px;
    border-radius: 10px;
    background: var(--bg-body);
    border: 1px solid var(--border);
    transition: all 0.2s ease;
}

.mesi-step-item:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.04);
}

.step-num-badge {
    width: 28px;
    height: 28px;
    border-radius: 999px;
    background: var(--primary);
    color: #ffffff;
    font-weight: 700;
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 4px;
    flex-wrap: wrap;
}

.step-title {
    font-weight: 700;
    font-size: 0.875rem;
    color: var(--text-main);
}

.step-desc {
    font-size: 0.825rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* --- BIT SLICING COMPARISON CARDS --- */
.bit-slicing-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.bit-row {
    display: flex;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--border);
}

.bit-cell {
    padding: 12px 10px;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 3px;
    border-right: 1px solid rgba(255, 255, 255, 0.1);
}

.bit-cell:last-child {
    border-right: none;
}

.bit-cell.vpn { flex: 2; background: rgba(59, 130, 246, 0.12); }
.bit-cell.offset { flex: 1.2; background: rgba(16, 185, 129, 0.12); }
.bit-cell.tag { flex: 2.2; background: rgba(139, 92, 246, 0.12); }
.bit-cell.index { flex: 1; background: rgba(245, 158, 11, 0.12); }

.bit-cell-label {
    font-size: 0.775rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--text-main);
}

.bit-cell-desc {
    font-size: 0.675rem;
    color: var(--text-muted);
}

@media (max-width: 640px) {
    .tier-blocks-row {
        grid-template-columns: 1fr;
    }
    .tier-blocks-row.scatter {
        flex-direction: column;
    }
    .chunk-layout-bar {
        height: auto;
        flex-direction: column;
    }
    .chunk-segment.meta {
        border-right: none;
        border-bottom: 2px dashed rgba(99, 102, 241, 0.4);
    }
    .arch-connector-bridge {
        padding: 0 10px;
    }
}