/* Nex site theme: shared by the landing page and documentation pages. */
:root {
  --bg: #fafbfc; --bg-alt: #f1f4f8; --card: #ffffff; --line: #e2e8f0;
  --text: #0f172a; --muted: #55637a;
  --accent: #0ea5a4; --accent-ink: #ffffff; --accent-soft: #d9f5f1;
  --warm: #f59e0b; --bad: #e11d48; --good: #059669;
  --code-bg: #0f172a; --code-text: #e2e8f0; --code-dim: #64748b;
  --k: #f472b6; --s: #fcd34d; --n: #67e8f9; --c: #64748b;
  --glow: radial-gradient(600px 300px at 80% 0%, #b8f0e8 0%, transparent 70%),
          radial-gradient(500px 300px at 0% 10%, #fde9b8 0%, transparent 70%);
  --dots: radial-gradient(#cbd5e1 1px, transparent 1px);
  --shadow: 0 10px 30px -12px rgba(15,23,42,.25);
}
:root[data-theme="dark"] {
  --bg: #0b1220; --bg-alt: #0f1a2e; --card: #111c31; --line: #23324d;
  --text: #e8eefc; --muted: #93a4c0;
  --accent: #33d1b0; --accent-ink: #04231d; --accent-soft: #113a37;
  --code-bg: #060c18;
  --glow: radial-gradient(600px 300px at 80% 0%, #0f4a46 0%, transparent 70%),
          radial-gradient(500px 300px at 0% 10%, #3b2c0e 0%, transparent 70%);
  --dots: radial-gradient(#22314d 1px, transparent 1px);
  --shadow: 0 10px 30px -12px rgba(0,0,0,.7);
}
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { background: var(--bg); color: var(--text); font: 17px/1.6 Inter, system-ui, sans-serif; -webkit-font-smoothing: antialiased; }
a { color: inherit; }
code, pre, .mono { font-family: "JetBrains Mono", monospace; font-variant-ligatures: none; }
.wrap { width: min(1100px, 100% - 2rem); margin: 0 auto; }

/* nav */
.nav { position: sticky; top: 0; z-index: 10; backdrop-filter: blur(10px); background: color-mix(in srgb, var(--bg) 85%, transparent); border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; align-items: center; gap: 1.5rem; height: 60px; }
.brand { display: flex; align-items: center; gap: .6rem; font: 700 1.15rem "JetBrains Mono", monospace; text-decoration: none; }
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.nav-links { display: flex; gap: 1.4rem; margin-left: auto; font-size: .92rem; font-weight: 500; }
.nav-links a { text-decoration: none; color: var(--muted); }
.nav-links a:hover { color: var(--text); }
.toggle { border: 1px solid var(--line); background: var(--card); color: var(--text); border-radius: 999px; width: 38px; height: 38px; cursor: pointer; font-size: 1rem; }
.toggle:hover { border-color: var(--accent); }
@media (max-width: 700px) { .nav-links a:not(.gh) { display: none; } }

.btn { display: inline-flex; align-items: center; gap: .5rem; padding: .8rem 1.3rem; border-radius: 12px; font-weight: 600; text-decoration: none; border: 1px solid var(--line); background: var(--card); transition: transform .15s, box-shadow .15s; }
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
:root:not([data-theme="dark"]) .btn.primary { background: #0f172a; color: #fff; }
.win { background: var(--code-bg); color: var(--code-text); border-radius: 16px; box-shadow: var(--shadow); border: 1px solid #1e293b; overflow: hidden; }
.win-bar { display: flex; align-items: center; gap: .45rem; padding: .7rem 1rem; background: #0b1324; border-bottom: 1px solid #1e293b; }
.dot { width: 11px; height: 11px; border-radius: 50%; }
.win-title { margin-left: .6rem; color: var(--code-dim); font: 500 .78rem "JetBrains Mono", monospace; }
.win pre { padding: 1.1rem 1.3rem; font-size: .84rem; line-height: 1.7; overflow-x: auto; }
.k { color: var(--k); } .s { color: var(--s); } .n { color: var(--n); } .c { color: var(--c); font-style: italic; }
.err { margin: 0 1.3rem 1.3rem; padding: .7rem 1rem; border-radius: 10px; font: 500 .82rem "JetBrains Mono", monospace; background: rgba(225,29,72,.14); border: 1px solid rgba(225,29,72,.5); color: #fda4af; }
.err b { color: #fb7185; }
.eyebrow { font: 500 .8rem "JetBrains Mono", monospace; color: var(--accent); text-transform: uppercase; letter-spacing: .12em; }
:root:not([data-theme="dark"]) .eyebrow { color: #0b7d7c; }
.tag { font: 600 .72rem "JetBrains Mono", monospace; margin-left: auto; padding: .15rem .55rem; border-radius: 6px; }
.tag.bad { background: rgba(225,29,72,.2); color: #fb7185; } .tag.good { background: rgba(16,185,129,.2); color: #34d399; }
.cmd { position: relative; background: var(--code-bg); color: var(--code-text); border-radius: 14px; padding: 1rem 5.5rem 1rem 1.2rem; font-size: .8rem; overflow-x: auto; white-space: nowrap; border: 1px solid #1e293b; }
.cmd::before { content: "$ "; color: var(--accent); }
.copy { position: absolute; right: .6rem; top: 50%; transform: translateY(-50%); background: #1e293b; color: #e2e8f0; border: 0; border-radius: 8px; padding: .4rem .8rem; font: 500 .75rem "JetBrains Mono", monospace; cursor: pointer; }
.copy:hover { background: var(--accent); color: var(--accent-ink); }
footer { border-top: 1px solid var(--line); padding: 2rem 0; color: var(--muted); font-size: .9rem; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 1rem 2rem; align-items: center; }
footer a { text-decoration: none; } footer a:hover { color: var(--text); }
footer .r { margin-left: auto; }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }

/* ───────── documentation pages (tutorial, guides) ───────── */
.page-head { padding: 3.2rem 0 2rem; border-bottom: 1px solid var(--line); margin-bottom: 2.2rem; }
.page-head h1 { font: 700 clamp(2rem, 4.6vw, 3rem)/1.1 "JetBrains Mono", monospace; letter-spacing: -.03em; margin: .5rem 0 .8rem; }
.page-head .lead { color: var(--muted); font-size: 1.15rem; max-width: 42rem; }

.doc { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 3.5rem; align-items: start; padding-bottom: 5rem; }
.doc > * { min-width: 0; }
@media (max-width: 900px) { .doc { grid-template-columns: minmax(0, 1fr); gap: 1.5rem; } }

.toc { position: sticky; top: 76px; max-height: calc(100vh - 96px); overflow-y: auto; font-size: .86rem; padding-right: .5rem; }
.toc summary { font: 600 .74rem "JetBrains Mono", monospace; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); cursor: pointer; padding: .3rem 0 .6rem; list-style: none; }
.toc summary::-webkit-details-marker { display: none; }
.toc ul { list-style: none; }
.toc ul ul { margin-left: .9rem; }
.toc a { display: block; padding: .22rem 0 .22rem .8rem; border-left: 2px solid var(--line); color: var(--muted); text-decoration: none; line-height: 1.35; }
.toc a:hover { color: var(--text); }
.toc a.on { color: var(--text); border-left-color: var(--accent); font-weight: 600; }
@media (max-width: 900px) {
  .toc { position: static; max-height: none; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: .6rem 1rem; }
  .toc summary::after { content: "▾"; float: right; transition: transform .15s; }
  .toc[open] summary::after { transform: rotate(180deg); }
  .toc[open] summary { border-bottom: 1px solid var(--line); margin-bottom: .5rem; }
}
@media (min-width: 901px) { .toc summary { pointer-events: none; } }

.prose { min-width: 0; max-width: 46rem; line-height: 1.75; }
.prose p { margin: 0 0 1.1rem; color: color-mix(in srgb, var(--text) 86%, var(--muted)); }
.prose h2 { font: 700 1.55rem/1.25 "JetBrains Mono", monospace; letter-spacing: -.02em; margin: 3.2rem 0 1rem; padding-top: 1.6rem; border-top: 1px solid var(--line); scroll-margin-top: 80px; }
.prose > h2:first-child { margin-top: 0; border-top: 0; padding-top: 0; }
.prose h3 { font: 600 1.05rem/1.3 "JetBrains Mono", monospace; margin: 2.2rem 0 .7rem; scroll-margin-top: 80px; }
.prose ul, .prose ol { margin: .4rem 0 1.2rem 1.4rem; color: color-mix(in srgb, var(--text) 86%, var(--muted)); }
.prose li { margin-bottom: .3rem; padding-left: .2rem; }
.prose li::marker { color: var(--accent); }
.prose a { color: var(--accent); text-decoration: underline; text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent); text-underline-offset: 3px; }
:root:not([data-theme="dark"]) .prose a { color: #0b7d7c; }
.prose a:hover { text-decoration-color: currentColor; }
.prose code { font-size: .85em; background: var(--bg-alt); border: 1px solid var(--line); border-radius: 6px; padding: .1em .38em; }
.prose pre { position: relative; background: var(--code-bg); color: var(--code-text); border: 1px solid #1e293b; border-radius: 14px; padding: 1.1rem 1.3rem; margin: 1.2rem 0 1.5rem; overflow-x: auto; font-size: .82rem; line-height: 1.7; box-shadow: var(--shadow); }
.prose pre code { background: none; border: 0; padding: 0; font-size: inherit; color: inherit; }
.prose pre .er { color: #fb7185; }
.pre-copy { position: absolute; top: .55rem; right: .55rem; background: #1e293b; color: #cbd5e1; border: 0; border-radius: 8px; padding: .3rem .7rem; font: 500 .72rem "JetBrains Mono", monospace; cursor: pointer; opacity: 0; transition: opacity .15s; }
.prose pre:hover .pre-copy, .pre-copy:focus-visible { opacity: 1; }
.pre-copy:hover { background: var(--accent); color: var(--accent-ink); }
@media (hover: none) { .pre-copy { opacity: 1; } }

.callout { border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--line)); border-left: 4px solid var(--accent); background: var(--accent-soft); border-radius: 12px; padding: .9rem 1.2rem; margin: 0 0 2.2rem; color: var(--text); font-size: .98rem; }
.callout a { color: inherit; text-decoration: underline; text-underline-offset: 3px; }

.next-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 1rem; margin-top: 3.5rem; padding-top: 2rem; border-top: 1px solid var(--line); }
.next-cards h2 { grid-column: 1 / -1; font: 700 1.2rem "JetBrains Mono", monospace; }
.next-card { display: block; text-decoration: none; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 1.1rem 1.2rem; transition: transform .15s, border-color .15s, box-shadow .15s; }
.next-card:hover { transform: translateY(-3px); border-color: var(--accent); box-shadow: var(--shadow); }
.next-card small { font: 500 .72rem "JetBrains Mono", monospace; color: var(--accent); text-transform: uppercase; letter-spacing: .1em; }
:root:not([data-theme="dark"]) .next-card small { color: #0b7d7c; }
.next-card b { display: block; margin: .2rem 0; }
.next-card span { color: var(--muted); font-size: .88rem; line-height: 1.4; display: block; }

/* ───────── article + postcard pages ───────── */
.wrap.narrow { width: min(780px, 100% - 2rem); }
.article { padding-bottom: 5rem; }
.prose .lead { font-size: 1.22rem; line-height: 1.6; color: var(--text); margin-bottom: 2.2rem; }
.prose .lead + h2, .article .prose > h2:first-of-type { margin-top: 2.6rem; }
.h2-num { display: inline-grid; place-items: center; min-width: 2rem; height: 2rem; margin-right: .7rem; border-radius: 8px; background: var(--accent-soft); color: var(--accent); font-size: .95rem; vertical-align: .12em; }
:root:not([data-theme="dark"]) .h2-num { color: #0b7d7c; }
.prose p.tight { margin-bottom: .5rem; }
.pre-caption { margin: -1rem 0 1.6rem !important; font-size: .88rem; color: var(--muted) !important; font-style: italic; }
.principle { border-left: 4px solid var(--warm); background: color-mix(in srgb, var(--warm) 12%, var(--card)); border-radius: 12px; padding: 1rem 1.3rem; margin: 1.8rem 0; font-size: 1.05rem; font-weight: 500; line-height: 1.6; }

.postcard-tools { display: flex; flex-wrap: wrap; gap: .6rem; align-items: center; margin-bottom: 1.4rem; }
.postcard-tools input { flex: 1 1 220px; min-width: 0; font: 500 .9rem "JetBrains Mono", monospace; padding: .6rem 1rem; border-radius: 999px; border: 1px solid var(--line); background: var(--card); color: var(--text); }
.postcard-tools input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.pc-btn { font: 500 .8rem "JetBrains Mono", monospace; padding: .55rem 1rem; border-radius: 999px; border: 1px solid var(--line); background: var(--card); color: var(--muted); cursor: pointer; }
.pc-btn:hover { color: var(--text); border-color: var(--accent); }
.pc-count { font: 500 .78rem "JetBrains Mono", monospace; color: var(--muted); margin-left: auto; }
details.syntax-item { background: var(--card); border: 1px solid var(--line); border-radius: 14px; margin-bottom: .7rem; overflow: hidden; scroll-margin-top: 80px; transition: border-color .15s, box-shadow .15s; }
details.syntax-item:hover { border-color: color-mix(in srgb, var(--accent) 50%, var(--line)); }
details.syntax-item[open] { border-color: var(--accent); box-shadow: var(--shadow); }
details.syntax-item > summary { display: flex; align-items: center; gap: .8rem; padding: .95rem 1.2rem; cursor: pointer; list-style: none; font: 600 .98rem "JetBrains Mono", monospace; }
details.syntax-item > summary::-webkit-details-marker { display: none; }
details.syntax-item > summary::after { content: "+"; margin-left: auto; width: 1.7rem; height: 1.7rem; display: grid; place-items: center; border-radius: 50%; background: var(--bg-alt); border: 1px solid var(--line); color: var(--muted); font-weight: 500; }
details.syntax-item[open] > summary::after { content: "−"; background: var(--accent); color: var(--accent-ink); border-color: transparent; }
details.syntax-item[open] > summary { border-bottom: 1px solid var(--line); }
.syntax-body { padding: .2rem 1.2rem .4rem; }
.syntax-body.prose { max-width: none; }
.syntax-body.prose pre { box-shadow: none; }
.syntax-body.prose > :last-child { margin-bottom: 1rem; }
.pc-empty { display: none; text-align: center; color: var(--muted); padding: 2rem 0; }
.wrap.narrow .prose { max-width: none; }
.pre-caption code { font-size: .95em; }

/* tables in prose (reference pages) */
.prose table { display: block; overflow-x: auto; width: 100%; border-collapse: collapse; margin: 1.2rem 0 1.6rem; font-size: .92rem; }
.prose th { font: 600 .74rem "JetBrains Mono", monospace; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); text-align: left; padding: .6rem .8rem; border-bottom: 2px solid var(--text); white-space: nowrap; }
.prose td { padding: .6rem .8rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose tr:last-child td { border-bottom: 0; }

/* reference pages: sidebar with page list, search and page TOC */
.side { position: sticky; top: 76px; max-height: calc(100vh - 96px); overflow-y: auto; display: grid; gap: 1rem; align-content: start; padding-right: .5rem; }
.side .toc { position: static; max-height: none; overflow: visible; padding-right: 0; }
@media (max-width: 900px) { .side { position: static; max-height: none; overflow: visible; padding-right: 0; } }
.ref-search { position: relative; }
.ref-search input { width: 100%; font: 500 .85rem "JetBrains Mono", monospace; padding: .55rem .9rem; border-radius: 999px; border: 1px solid var(--line); background: var(--card); color: var(--text); }
.ref-search input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.ref-results { display: none; position: absolute; z-index: 30; left: 0; right: 0; top: calc(100% + 6px); max-height: 60vh; overflow-y: auto; background: var(--card); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); padding: .4rem; }
.ref-results.on { display: block; }
.ref-results a { display: block; padding: .5rem .7rem; border-radius: 10px; text-decoration: none; color: var(--text); font-size: .85rem; line-height: 1.4; }
.ref-results a:hover, .ref-results a:focus { background: var(--bg-alt); }
.ref-results b { display: block; font: 600 .8rem "JetBrains Mono", monospace; }
.ref-results span { color: var(--muted); font-size: .78rem; }
.ref-results mark { background: color-mix(in srgb, var(--warm) 35%, transparent); color: inherit; border-radius: 3px; }
.ref-results p { padding: .6rem .8rem; color: var(--muted); font-size: .85rem; }
.prose > section:first-child > h2:first-child { margin-top: 0; border-top: 0; padding-top: 0; }