/* --- VARIABLES & RESET --- */
:root {
--bg: #ffffff;
--fg: #111111;
--accent: #0066cc;
--font-main: "Fira Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
:root {
--bg: #1c1c1c;
--fg: #e0e0e0;
--accent: #5da9ff;
}
}

body {
background-color: var(--bg);
color: var(--fg);
font-family: var(--font-main);
margin: 0;
line-height: 1.6;
font-size: 1.25rem;
overflow-x: hidden;
padding-bottom: 150px;
}

/* --- HEADER --- */
header {
padding: 1rem 0;
border-bottom: 1px solid var(--fg);
opacity: 0.8;
background: var(--bg);
position: sticky;
top: 0;
z-index: 100;
}

nav {
width: 100%;
max-width: 1024px;
margin: 0 auto;
padding: 0 2rem;
display: flex;
justify-content: space-between;
align-items: baseline;
box-sizing: border-box;
}

.foo {
margin-left: 1.0rem;
}

#logo {
font-weight: 700;
font-size: 1.2rem;
text-decoration: none;
color: var(--fg);
}
#logo-full { font-weight: 400; }

a { color: var(--accent); text-decoration: none; transition: all 0.2s; }
a:hover { text-decoration: underline; }

/* --- GLOBAL 3-COLUMN GRID --- */
.global-grid {
display: grid;
/* Left | Center (1024px) | Right */
grid-template-columns: 1fr minmax(auto, 1024px) 1fr;
gap: 2rem;
align-items: start;
width: 100%;
margin-top: 3rem;
position: relative; 
}

/* --- SIDEBARS --- */
.sidebar-left {
position: relative;
padding-left: 1rem;
}
.sidebar-left::-webkit-scrollbar { display: none; }

.sidebar-right {
position: relative;
display: flex;
justify-content: flex-start;
padding-right: 1rem;
height: 100%;
max-height: none;
overflow: visible;
}

.sidebar-inner {
width: 250px; 
}

.sidebar-left .sidebar-inner {
position: fixed;
top: 50%;
transform: translateY(-50%); /* perfect vertical centering */
width: 100%; 
max-width: 100%;

max-height: calc(100vh - 6rem); 
overflow-y: auto;

font-size: 1.5rem;
}

.sidebar-right .sidebar-inner {
position: relative; 
padding-left: 1rem;
font-style: italic;
color: #888;
min-height: 100vh;
}

/* --- TELEPORTED NOTE STYLE --- */
.margin-note {
position: absolute;
width: 100%;
font-size: 1.2rem;
line-height: 1.4;
color: var(--fg);
opacity: 0.8;
transition: top 0.2s ease;
}

.margin-note-source {
display: inline-block;
width: 0;
height: 0;
visibility: hidden;
overflow: hidden;
vertical-align: top;
}

/* --- MAIN CONTENT --- */
.main-column {
padding: 0 2rem;
min-width: 0;
position: relative;
z-index: 10;
}

/* --- CODE BLOCKS & LINE NUMBERS --- */
pre {
padding: 1rem;
overflow-x: auto;
background: rgba(128, 128, 128, 0.1);
border-radius: 4px;
}

.rouge-table {
margin-bottom: 0;
font-size: 0.9em;
width: 100%;
border-spacing: 0;
}

.rouge-gutter {
text-align: right;
padding-right: 0.5rem;
border-right: 1px solid rgba(128, 128, 128, 0.2);
user-select: none;
opacity: 0.4;
vertical-align: top;
width: 1rem;
}

.rouge-code {
padding-left: 0.5rem;
vertical-align: top;
}

/* --- TOC STYLES --- */
#toc {
display: block;
margin: 0;
padding: 0;
}

.toc-title {
font-weight: bold;
margin-bottom: 0.5rem;
text-transform: uppercase;
letter-spacing: 0.05em;
opacity: 0.6;
}

.toc-link {
display: block;
color: var(--fg);
opacity: 0.6;
margin-bottom: 0.4rem;
margin-left: 2.0rem;
font-size: 1.0rem;
text-decoration: none !important;
}
.toc-link:hover { opacity: 1; }
.toc-link.active {
opacity: 1;
color: var(--accent);
transform: scale(1.06) translateX(20px);
text-shadow: 0 0 12px var(--accent);
font-weight: 600;
}

/* --- COMPONENTS --- */
.container {
max-width: 1024px;
margin: 0 auto;
padding: 2rem 1rem;
}

/* --- TYPOGRAPHY --- */
h1, h2, h3 { font-weight: 600; scroll-margin-top: 5rem; }

.title {
font-size: 2.2rem;
margin-bottom: 0.2rem;
line-height: 1.2;
}

.frontpage .title {
font-size: 3.0rem;
letter-spacing: -0.02em;
}

.subtitle {
font-size: 1.6rem;
color: var(--fg);
opacity: 0.8;
margin-top: 0;
line-height: 1.4;
}

.post-meta {
color: #888;
font-size: 0.9em;
margin-top: -1rem;
margin-bottom: 2rem;
}

/* --- RESPONSIVE --- */
@media (max-width: 1400px) {
.global-grid {
grid-template-columns: 200px 1fr 200px;
}
.sidebar-inner { width: 100%; }
}

@media (max-width: 1100px) {
.global-grid {
display: block;
padding: 0 1rem;
}
.sidebar-left, .sidebar-right {
display: none;
}
nav { padding: 0 1rem; }
.main-column { padding: 0; }

.margin-note-source {
display: inline-block;
width: auto;
height: auto;
visibility: visible;
background: #f0f0f0;
padding: 0.2rem 0.5rem;
margin: 0.5rem 0;
font-style: italic;
border-left: 3px solid var(--accent);
}
}