/* ── LLM-Wiki: Lean Dark Theme v2 ── */
:root {
  --bg: #0b0f1a; --bg-alt: #131a2e; --bg-card: #1a2240;
  --fg: #e2e8f0; --fg-dim: #94a3b8; --fg-faint: #64748b;
  --accent: #818cf8; --accent2: #c084fc; --green: #34d399; --red: #f87171; --yellow: #fbbf24;
  --border: #1e293b; --border-hi: #334155;
  --radius: .625rem; --font: 'JetBrains Mono', ui-monospace, monospace;
  --font-sans: system-ui, -apple-system, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-sans); background: var(--bg); color: var(--fg); line-height: 1.7; min-height: 100vh; display: flex; flex-direction: column; }
a { color: var(--accent); text-decoration: none; } a:hover { text-decoration: underline; }
.container { max-width: 1280px; margin: 0 auto; padding: 0 1.5rem; width: 100%; }

/* ── Skip Link ── */
.skip-link { position: absolute; top: -100%; left: 1rem; background: var(--accent); color: #fff; padding: .5rem 1rem; border-radius: var(--radius); z-index: 1000; transition: top .2s; }
.skip-link:focus { top: 1rem; }

/* ── Header ── */
.site-header { background: var(--bg-alt); border-bottom: 1px solid var(--border); padding: .75rem 0; position: sticky; top: 0; z-index: 100; backdrop-filter: blur(8px); }
.site-header .container { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: .5rem; }
.logo { font-size: 1.15rem; font-weight: 700; color: var(--fg); white-space: nowrap; }
.logo span { color: var(--accent); }
.main-nav { display: flex; gap: 1.25rem; align-items: center; flex-wrap: wrap; }
.main-nav a { color: var(--fg-dim); font-size: .85rem; font-weight: 500; }
.main-nav a:hover, .main-nav a.active { color: var(--accent); text-decoration: none; }
.nav-live { background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #fff !important; padding: .3rem .7rem; border-radius: var(--radius); font-size: .8rem; }

/* ── Layout ── */
.layout { display: grid; grid-template-columns: 220px 1fr; gap: 2rem; padding: 2rem 1.5rem; flex: 1; max-width: 1280px; margin: 0 auto; width: 100%; }

/* ── Sidebar ── */
.sidebar { position: sticky; top: 4.5rem; align-self: start; max-height: calc(100vh - 5rem); overflow-y: auto; }
.sidebar::-webkit-scrollbar { width: 4px; } .sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }
.sidebar-nav h3 { font-size: .65rem; text-transform: uppercase; color: var(--fg-faint); margin: 1.25rem 0 .4rem; letter-spacing: .08em; font-weight: 600; }
.sidebar-nav h3:first-child { margin-top: 0; }
.sidebar-nav a { display: block; padding: .25rem 0; color: var(--fg-dim); font-size: .825rem; line-height: 1.4; }
.sidebar-nav a:hover { color: var(--accent); text-decoration: none; }
.sidebar-nav .section-link { font-weight: 600; color: var(--fg); }

/* Sidebar TOC */
.sidebar-nav #TableOfContents { margin-bottom: .5rem; }
.sidebar-nav #TableOfContents ul { list-style: none; margin: 0; padding: 0; }
.sidebar-nav #TableOfContents ul ul { padding-left: .75rem; }
.sidebar-nav #TableOfContents li { margin: .15rem 0; }
.sidebar-nav #TableOfContents a { font-size: .75rem; color: var(--fg-faint); padding: .1rem 0; }
.sidebar-nav #TableOfContents a:hover { color: var(--accent); }
.sidebar-nav #TableOfContents > ul > li > a { font-size: .8rem; color: var(--fg-dim); }

/* ── Main Content ── */
main { min-width: 0; }

/* ── Hero ── */
.hero { text-align: center; padding: 2.5rem 0 2rem; }
.hero h1 { font-size: 2.25rem; font-weight: 800; background: linear-gradient(135deg, var(--accent), var(--accent2)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: .5rem; }
.hero p { color: var(--fg-dim); font-size: 1.05rem; }
.hero-actions { display: flex; gap: .75rem; justify-content: center; margin-top: 1.5rem; flex-wrap: wrap; }

/* ── Home Content ── */
.home-content { margin: 1.5rem 0; }
.home-content h2 { font-size: 1.25rem; font-weight: 600; margin: 1.5rem 0 .75rem; padding-top: 1rem; border-top: 1px solid var(--border); }
.home-content ul { margin: .5rem 0 1rem 1.5rem; color: var(--fg-dim); }
.home-content li { margin-bottom: .35rem; }

/* ── Cards ── */
.home-latest { margin-top: 2rem; }
.home-latest > h2 { font-size: 1.25rem; font-weight: 600; margin-bottom: 1rem; }
.page-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem; }
.card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; transition: border-color .15s, transform .15s; display: flex; flex-direction: column; gap: .5rem; }
.card:hover { border-color: var(--accent); transform: translateY(-1px); }
.card-meta { display: flex; justify-content: space-between; align-items: center; font-size: .7rem; }
.card-section { color: var(--accent); font-weight: 600; text-transform: uppercase; letter-spacing: .04em; }
.card-date { color: var(--fg-faint); }
.card h3 { font-size: 1rem; margin: 0; border: none; padding: 0; line-height: 1.3; }
.card h3 a { color: var(--fg); }
.card p { color: var(--fg-dim); font-size: .825rem; margin: 0; line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card-tags { display: flex; gap: .35rem; flex-wrap: wrap; margin-top: auto; }
.card-tag { font-size: .65rem; color: var(--fg-faint); background: var(--bg-alt); border: 1px solid var(--border); padding: .1rem .4rem; border-radius: .75rem; }

/* ── Buttons ── */
.btn { display: inline-block; padding: .5rem 1.25rem; border-radius: var(--radius); font-weight: 600; font-size: .85rem; cursor: pointer; border: none; transition: all .15s; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #6366f1; text-decoration: none; color: #fff; }
.btn-outline { background: transparent; border: 1px solid var(--accent); color: var(--accent); }
.btn-outline:hover { background: var(--accent); color: #fff; text-decoration: none; }
.btn-ghost { background: transparent; border: 1px solid var(--border); color: var(--fg-dim); }
.btn-ghost:hover { border-color: var(--fg-dim); color: var(--fg); text-decoration: none; }

/* ── Article / Content ── */
.content h1 { font-size: 1.75rem; font-weight: 700; margin-bottom: .5rem; line-height: 1.3; }
.content h2 { font-size: 1.25rem; font-weight: 600; margin: 2.5rem 0 .75rem; padding-top: 1.5rem; border-top: 1px solid var(--border); }
.content h3 { font-size: 1.05rem; font-weight: 600; margin: 1.5rem 0 .5rem; color: var(--accent); }
.content h4 { font-size: .95rem; font-weight: 600; margin: 1rem 0 .3rem; color: var(--fg-dim); }
.content p { margin-bottom: .75rem; color: var(--fg-dim); }
.content strong { color: var(--fg); }
.content ul, .content ol { margin: .4rem 0 .75rem 1.25rem; color: var(--fg-dim); }
.content li { margin-bottom: .25rem; }
.content li > ul, .content li > ol { margin-bottom: .25rem; }
.content hr { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }
.content blockquote { border-left: 3px solid var(--accent); padding: .75rem 1rem; margin: 1rem 0; background: var(--bg-alt); border-radius: var(--radius); color: var(--fg-dim); }
.content blockquote p:last-child { margin-bottom: 0; }

/* ── Lead / Intro Paragraph ── */
.lead { font-size: 1.1rem; color: var(--fg-dim); line-height: 1.8; margin-bottom: 1.5rem; }

/* ── Code ── */
.content code { background: var(--bg-alt); padding: .15rem .4rem; border-radius: .25rem; font-family: var(--font); font-size: .825em; color: var(--accent2); }
.content pre { background: var(--bg-alt); border: 1px solid var(--border); padding: 1rem; border-radius: var(--radius); overflow-x: auto; margin: 1rem 0; position: relative; }
.content pre code { background: none; padding: 0; color: var(--fg); font-size: .825rem; }

/* ── Hugo Chroma Syntax Highlighting (github-dark) ── */
.chroma { background: var(--bg-alt) !important; }
.chroma .lntable { width: 100%; border-collapse: collapse; }
.chroma .lntd:first-child { width: 1%; }
.chroma .lnt { padding: 0 .75rem 0 .5rem; color: var(--fg-faint); text-align: right; user-select: none; border-right: 1px solid var(--border); }
.chroma .lntd:last-child { width: 100%; }
.chroma .cl { display: block; padding: .1rem .75rem; }
.chroma .hl { background: rgba(129, 140, 248, .08); display: block; }
/* Inline code blocks (no line numbers) */
.content pre:not(:has(.lntable)) code { display: block; padding: .1rem .2rem; overflow-x: auto; }

/* ── Copy Button ── */
.copy-btn { position: absolute; top: .5rem; right: .5rem; padding: .25rem .6rem; font-size: .7rem; background: var(--bg-card); border: 1px solid var(--border); color: var(--fg-dim); border-radius: .25rem; cursor: pointer; opacity: 0; transition: opacity .15s; font-family: var(--font-sans); }
.copy-btn:hover { color: var(--fg); border-color: var(--accent); }
pre:hover .copy-btn, .copy-btn:focus { opacity: 1; }
.copy-btn.copied { color: var(--green); border-color: var(--green); opacity: 1; }

/* ── Tables ── */
.content table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: .85rem; display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.content th { background: var(--bg-alt); color: var(--fg); font-weight: 600; text-align: left; padding: .6rem .75rem; border-bottom: 2px solid var(--border-hi); white-space: nowrap; }
.content td { padding: .5rem .75rem; border-bottom: 1px solid var(--border); color: var(--fg-dim); }
.content tr:hover td { background: var(--bg-card); }

/* ── Tags / Badges ── */
.badge { display: inline-block; background: var(--bg-alt); border: 1px solid var(--border); padding: .15rem .55rem; border-radius: 1rem; font-size: .7rem; color: var(--fg-dim); font-weight: 500; }
.badge-green { border-color: var(--green); color: var(--green); }
.badge-red { border-color: var(--red); color: var(--red); }
.badge-yellow { border-color: var(--yellow); color: var(--yellow); }

/* ── Article Header ── */
.article-header { margin-bottom: 1.5rem; padding-bottom: 1rem; border-bottom: 1px solid var(--border); }
.article-meta { font-size: .8rem; color: var(--fg-faint); margin-top: .5rem; }
.meta-sep { margin: 0 .4rem; color: var(--border-hi); }
.abstract { font-size: 1rem; color: var(--fg-dim); font-style: italic; margin-top: .75rem; }
.tags { display: flex; gap: .4rem; flex-wrap: wrap; margin-top: .75rem; }

/* ── TOC ── */
.toc { background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.25rem; margin: 0 0 1.5rem; }
.toc h4 { margin: 0 0 .5rem; font-size: .75rem; text-transform: uppercase; color: var(--fg-faint); letter-spacing: .05em; }
.toc ul, .sidebar-nav ul { list-style: none; margin: 0; padding: 0; }
.toc li { margin: .2rem 0; }
.toc a { font-size: .825rem; display: block; }
.toc ul ul { padding-left: 1rem; }
.toc li li a { font-size: .775rem; color: var(--fg-faint); }

/* ── Article Footer ── */
.article-footer { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }
.tag-links { display: flex; gap: .35rem; flex-wrap: wrap; }
.share-links { display: flex; gap: .75rem; align-items: center; font-size: .8rem; color: var(--fg-faint); }
.share-links a:hover { color: var(--accent); }

/* ── Related Posts ── */
.related-posts { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--border); }
.related-posts > h2 { font-size: 1.15rem; margin-bottom: 1rem; border: none; padding: 0; }

/* ── Footer ── */
.site-footer { background: var(--bg-alt); border-top: 1px solid var(--border); padding: 1.25rem 0; margin-top: auto; text-align: center; }
.site-footer p { color: var(--fg-faint); font-size: .8rem; }
.site-footer a { color: var(--fg-dim); }
.site-footer a:hover { color: var(--accent); }

/* ── Reading Progress Bar ── */
#reading-progress { position: fixed; top: 0; left: 0; height: 3px; background: linear-gradient(90deg, var(--accent), var(--accent2)); z-index: 9999; width: 0%; transition: width .1s linear; }

/* ── Section Icons ── */
.section-icon { display: inline-block; margin-right: .4rem; font-size: 1.1em; }

/* ── Mobile ── */
@media (max-width: 768px) {
  .layout { grid-template-columns: 1fr; padding: 1rem; }
  .sidebar { position: static; max-height: none; margin-bottom: 1.5rem; order: -1; }
  .main-nav a:not(.nav-live) { display: none; }
  .hero h1 { font-size: 1.75rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .content table { font-size: .8rem; }
  .content th, .content td { padding: .4rem .5rem; }
  .article-footer { flex-direction: column; align-items: flex-start; }
}

/* ── Print ── */
@media print {
  .site-header, .sidebar, .site-footer, #reading-progress, .share-links, .hero-actions { display: none !important; }
  .layout { display: block; }
  .content table { display: table; }
  body { background: #fff; color: #000; }
}