:root {
    --bg:       #080b0f;
    --bg2:      #0c1016;
    --bg3:      #101520;
    --panel:    #141a24;
    --panel2:   #1a2232;
    --border:   #1e2a3a;
    --border2:  #2a3a50;
    --border3:  #3a4f68;
    --white:    #e8f0ff;
    --text:     #9ab0cc;
    --text2:    #6a82a0;
    --text3:    #384a60;
    --red:      #ff3355;
    --red2:     #cc2244;
    --cyan:     #00d4ff;
    --cyan2:    #0099cc;
    --amber:    #ffaa00;
    --green:    #00ff88;
    --green2:   #00cc66;
    --purple:   #aa66ff;
    --orange:   #ff7733;
    --code-bg:  #070a0e;
    --gutter:   #1a2030;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 15px; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Oxanium', sans-serif;
    line-height: 1.65;
    overflow-x: hidden;
}

body::after {
    content: '';
    position: fixed; inset: 0;
    background: repeating-linear-gradient(
        0deg, transparent, transparent 3px,
        rgba(0,0,0,0.03) 3px, rgba(0,0,0,0.03) 4px
    );
    pointer-events: none;
    z-index: 9999;
}

.layout {
    display: grid;
    grid-template-columns: 270px 1fr;
    min-height: 100vh;
}

/* ══ SIDEBAR ══ */
.sidebar {
    position: sticky; top: 0;
    height: 100vh; overflow-y: auto;
    background: var(--bg2);
    border-right: 1px solid var(--border);
    display: flex; flex-direction: column;
}
.sidebar::-webkit-scrollbar { width: 3px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border2); }

.sb-logo {
    padding: 24px 20px 18px;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(135deg, var(--bg2) 0%, rgba(255,51,85,0.05) 100%);
}
.sb-logo-eyebrow {
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px; letter-spacing: 0.25em;
    text-transform: uppercase; color: var(--red);
    margin-bottom: 6px;
}
.sb-logo-name {
    font-family: 'Anybody', sans-serif;
    font-size: 26px; font-weight: 900;
    color: var(--white); letter-spacing: -0.02em;
    line-height: 1.1;
}
.sb-logo-name em { color: var(--red); font-style: normal; }
.sb-logo-sub {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px; color: var(--text3); margin-top: 5px;
}
.sb-actions {
    display: flex; gap: 6px; margin-top: 12px;
}
.sb-btn {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px; padding: 5px 10px;
    background: var(--panel); border: 1px solid var(--border2);
    color: var(--text2); cursor: pointer; border-radius: 3px;
    text-decoration: none; transition: all 0.15s;
    letter-spacing: 0.05em;
}
.sb-btn:hover { background: var(--panel2); color: var(--white); border-color: var(--border3); }
.sb-btn.primary { color: var(--red); border-color: rgba(255,51,85,0.4); }
.sb-btn.primary:hover { background: rgba(255,51,85,0.1); }
.sb-btn.back { color: var(--text2); border-color: var(--border); background: transparent; }
.sb-btn.back:hover { color: var(--white); border-color: var(--border3); background: rgba(255,51,85,0.07); }

.nav-group { padding: 4px 0; border-bottom: 1px solid var(--border); }
.nav-group-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px; letter-spacing: 0.2em;
    text-transform: uppercase; color: var(--text3);
    padding: 10px 18px 3px;
}
.nav-link {
    display: flex; align-items: center; gap: 8px;
    padding: 6px 18px; font-size: 13px; font-weight: 400;
    color: var(--text2); text-decoration: none;
    border-left: 2px solid transparent;
    transition: all 0.12s; cursor: pointer;
}
.nav-link:hover, .nav-link.active {
    color: var(--white); border-left-color: var(--red);
    background: rgba(255,51,85,0.04);
}
.nav-mono {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px; color: var(--red); opacity: 0.8;
    min-width: 20px;
}
.nav-new {
    font-family: 'JetBrains Mono', monospace;
    font-size: 8px; padding: 1px 5px;
    background: rgba(255,51,85,0.15); color: var(--red);
    border-radius: 2px; margin-left: auto;
    letter-spacing: 0.05em;
}

.sb-footer {
    margin-top: auto; padding: 14px 18px;
    border-top: 1px solid var(--border);
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px; color: var(--text3); line-height: 1.8;
}
.sb-footer a { color: var(--cyan); text-decoration: none; }

/* ══ MAIN ══ */
.main { max-width: 960px; }

/* HERO */
.hero {
    padding: 56px 56px 48px;
    background: var(--bg2);
    border-bottom: 1px solid var(--border);
    position: relative; overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute; top: -120px; right: -80px;
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(255,51,85,0.08) 0%, transparent 65%);
    pointer-events: none;
    animation: glow 6s ease-in-out infinite;
}
.hero::after {
    content: '';
    position: absolute; bottom: -60px; left: 30%;
    width: 350px; height: 350px;
    background: radial-gradient(circle, rgba(0,212,255,0.04) 0%, transparent 65%);
    pointer-events: none;
}
@keyframes glow { 0%,100%{opacity:.5} 50%{opacity:1} }

.hero-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px; letter-spacing: 0.25em;
    text-transform: uppercase; color: var(--red);
    margin-bottom: 14px;
    display: flex; align-items: center; gap: 10px;
}
.hero-tag::before {
    content: ''; width: 32px; height: 1px; background: var(--red);
}
.hero h1 {
    font-family: 'Anybody', sans-serif;
    font-size: clamp(32px, 5vw, 52px);
    font-weight: 900; color: var(--white);
    letter-spacing: -0.03em; line-height: 1.05;
    margin-bottom: 18px;
}
.hero h1 .accent { color: var(--red); }
.hero h1 .accent2 { color: var(--cyan); }
.hero-desc {
    font-size: 15px; color: var(--text2);
    max-width: 580px; line-height: 1.8;
    margin-bottom: 28px;
}
.badges { display: flex; gap: 8px; flex-wrap: wrap; }
.badge {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px; padding: 4px 10px;
    border-radius: 3px; border: 1px solid; letter-spacing: 0.05em;
}
.b-red    { color: var(--red);    border-color: rgba(255,51,85,0.35);  background: rgba(255,51,85,0.07); }
.b-cyan   { color: var(--cyan);   border-color: rgba(0,212,255,0.3);   background: rgba(0,212,255,0.06); }
.b-amber  { color: var(--amber);  border-color: rgba(255,170,0,0.3);   background: rgba(255,170,0,0.06); }
.b-green  { color: var(--green);  border-color: rgba(0,255,136,0.3);   background: rgba(0,255,136,0.06); }
.b-purple { color: var(--purple); border-color: rgba(170,102,255,0.3); background: rgba(170,102,255,0.06); }

/* SECTION */
.section {
    padding: 48px 56px;
    border-bottom: 1px solid var(--border);
    animation: fadeUp 0.3s ease both;
}
@keyframes fadeUp { from{opacity:0;transform:translateY(10px)} to{opacity:1;transform:none} }

.sec-header {
    display: flex; align-items: center; gap: 12px;
    margin-bottom: 28px;
}
.sec-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px; color: var(--text3); min-width: 26px;
}
.sec-badge {
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px; padding: 2px 8px;
    background: rgba(255,51,85,0.12); color: var(--red);
    border-radius: 2px; letter-spacing: 0.1em;
}
.section h2 {
    font-family: 'Anybody', sans-serif;
    font-size: 22px; font-weight: 700; color: var(--white);
    letter-spacing: -0.01em;
}
.section h3 {
    font-size: 14px; font-weight: 600; color: var(--white);
    margin: 26px 0 10px;
    display: flex; align-items: center; gap: 8px;
}
.section h3::before {
    content: ''; width: 3px; height: 14px;
    background: var(--red); border-radius: 2px; display: block;
}
.section p {
    color: var(--text2); margin-bottom: 12px;
    line-height: 1.8; font-size: 14px;
}
.section p strong { color: var(--white); font-weight: 600; }
[id] { scroll-margin-top: 20px; }

/* ══ CODE BLOCKS ══ */
.code-block {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 6px; margin: 14px 0;
    overflow: hidden;
    box-shadow: 0 4px 24px rgba(0,0,0,0.4);
}
.code-header {
    display: flex; align-items: center;
    justify-content: space-between;
    padding: 8px 14px;
    background: var(--panel);
    border-bottom: 1px solid var(--border);
}
.code-filename {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px; color: var(--text3);
    letter-spacing: 0.05em;
    display: flex; align-items: center; gap: 6px;
}
.code-filename::before {
    content: '▸'; color: var(--red); font-size: 8px;
}
.copy-btn {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px; color: var(--text3); background: none;
    border: 1px solid var(--border); padding: 3px 8px;
    cursor: pointer; border-radius: 2px;
    transition: all 0.15s; letter-spacing: 0.05em;
}
.copy-btn:hover { color: var(--white); border-color: var(--border2); }

.code-body {
    display: flex; overflow-x: auto;
}
.line-nums {
    padding: 18px 0;
    background: var(--gutter);
    border-right: 1px solid var(--border);
    min-width: 42px; text-align: right;
    user-select: none;
}
.line-nums span {
    display: block; padding: 0 12px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px; color: var(--text3);
    line-height: 1.8;
}
.code-inner {
    padding: 18px 20px; flex: 1;
}
.code-inner pre {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12.5px; line-height: 1.8;
    color: var(--text);
    white-space: pre;
}

/* Syntax tokens — H# specific */
.t-comment  { color: #3a5070; font-style: italic; }
.t-kw       { color: var(--cyan); font-weight: 600; }    /* fn, let, if, for, while, do, end, return, match, struct, enum, trait, impl, pub, import, unsafe, arena, in */
.t-kw2      { color: var(--red); font-weight: 700; }     /* mut */
.t-prefix   { color: var(--red); font-weight: 700; }
.t-str      { color: var(--amber); }
.t-num      { color: var(--purple); }
.t-var      { color: var(--orange); }
.t-func     { color: #6699ff; }
.t-lib      { color: var(--purple); }
.t-op       { color: var(--green); font-weight: 700; }
.t-type     { color: var(--cyan); font-style: italic; }
.t-const    { color: var(--green); font-weight: 700; }
.t-dim      { color: var(--text3); }

/* ══ TABLES ══ */
.ref-table {
    width: 100%; border-collapse: collapse;
    margin: 14px 0; font-size: 13px;
}
.ref-table th {
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px; letter-spacing: 0.15em;
    text-transform: uppercase; color: var(--text3);
    padding: 10px 14px; text-align: left;
    border-bottom: 1px solid var(--border);
    background: var(--panel);
}
.ref-table td {
    padding: 10px 14px;
    border-bottom: 1px solid rgba(30,42,58,0.6);
    vertical-align: top;
}
.ref-table tr:last-child td { border-bottom: none; }
.ref-table tr:hover td { background: rgba(255,51,85,0.02); }
.td-syntax {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px; color: var(--green);
    white-space: nowrap;
}
.td-desc { color: var(--text2); font-size: 13px; }
.td-note {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px; color: var(--text3);
}

/* ══ CALLOUTS ══ */
.callout {
    display: flex; gap: 12px;
    padding: 14px 16px; border-radius: 5px;
    margin: 16px 0; font-size: 13px; line-height: 1.7;
}
.ci { font-family: 'JetBrains Mono', monospace; font-size: 12px; min-width: 20px; padding-top: 1px; }
.cb { color: var(--text2); }
.cb strong { color: var(--white); }
.cb code { font-family: 'JetBrains Mono', monospace; font-size: 11px; background: rgba(255,255,255,0.06); padding: 1px 5px; border-radius: 2px; color: var(--green); }
.c-info   { background: rgba(0,212,255,0.05);   border: 1px solid rgba(0,212,255,0.2); }
.c-info .ci   { color: var(--cyan); }
.c-warn   { background: rgba(255,170,0,0.05);   border: 1px solid rgba(255,170,0,0.2); }
.c-warn .ci   { color: var(--amber); }
.c-danger { background: rgba(255,51,85,0.05);   border: 1px solid rgba(255,51,85,0.2); }
.c-danger .ci { color: var(--red); }
.c-tip    { background: rgba(0,255,136,0.04);   border: 1px solid rgba(0,255,136,0.2); }
.c-tip .ci    { color: var(--green); }
.c-new    { background: rgba(170,102,255,0.05); border: 1px solid rgba(170,102,255,0.25); }
.c-new .ci    { color: var(--purple); }

/* ══ GRIDS & CARDS ══ */
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 14px 0; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 14px 0; }
.grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin: 14px 0; }
.card {
    background: var(--panel); border: 1px solid var(--border);
    border-radius: 5px; padding: 14px 16px;
    transition: border-color 0.2s;
}
.card:hover { border-color: var(--border2); }
.card-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px; color: var(--red);
    margin-bottom: 6px; font-weight: 700;
    letter-spacing: 0.03em;
}
.card-body { font-size: 12.5px; color: var(--text2); line-height: 1.65; }

/* PILLS */
.pill {
    display: inline-block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px; padding: 2px 8px;
    border-radius: 12px; margin: 2px; border: 1px solid;
}
.p-red    { color: var(--red);    border-color: rgba(255,51,85,0.4);  background: rgba(255,51,85,0.08); }
.p-cyan   { color: var(--cyan);   border-color: rgba(0,212,255,0.35); background: rgba(0,212,255,0.07); }
.p-amber  { color: var(--amber);  border-color: rgba(255,170,0,0.35); background: rgba(255,170,0,0.07); }
.p-green  { color: var(--green);  border-color: rgba(0,255,136,0.3);  background: rgba(0,255,136,0.06); }
.p-purple { color: var(--purple); border-color: rgba(170,102,255,0.3);background: rgba(170,102,255,0.07); }
.p-orange { color: var(--orange); border-color: rgba(255,119,51,0.35);background: rgba(255,119,51,0.07); }
.p-blue   { color: #4499ff;       border-color: rgba(68,153,255,0.35);background: rgba(68,153,255,0.07); }

/* INLINE CODE */
code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85em; background: rgba(0,212,255,0.06);
    color: var(--cyan); padding: 1px 5px;
    border-radius: 3px; border: 1px solid rgba(0,212,255,0.15);
}

/* HERO feature grid */
.hero-pills { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 28px; }
.feature-grid {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 10px; margin-top: 20px;
}
.feat-item {
    display: flex; gap: 10px; align-items: flex-start;
    background: rgba(255,51,85,0.04); border: 1px solid var(--border);
    border-radius: 5px; padding: 12px 14px; font-size: 12.5px;
}
.feat-icon { font-size: 18px; min-width: 24px; line-height: 1.4; }
.feat-item strong { color: var(--white); display: block; font-size: 12px; margin-bottom: 2px; }
.feat-item div { color: var(--text2); }
.feat-item code { font-size: 10px; }

/* DIVIDER */
.divider {
    height: 1px; margin: 24px 0;
    background: linear-gradient(90deg, var(--red) 0%, transparent 60%);
    opacity: 0.25;
}

/* LOADING */
.section-loading {
    padding: 48px 56px;
    color: var(--text3);
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    border-bottom: 1px solid var(--border);
}

/* RESPONSIVE */
@media (max-width: 800px) {
    .layout { grid-template-columns: 1fr; }
    .sidebar { position: static; height: auto; }
    .hero, .section { padding: 28px 20px; }
    .grid2, .grid3, .grid4 { grid-template-columns: 1fr; }
    .feature-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 500px) {
    .feature-grid { grid-template-columns: 1fr; }
}