/* MotionBricks.wiki — NVIDIA-inspired design language.
   Black #000000 base, white text, NVIDIA green #76b900 as accent (borders/underlines/CTAs only).
   Dark and light sections alternate for rhythm. */
:root {
  --bg: #000000;
  --bg-soft: #0d0d0d;
  --panel-dark: #1a1a1a;
  --panel-light: #ffffff;
  --line-dark: #2a2a2a;
  --ink: #ffffff;
  --ink-2: #b8b8b8;
  --accent: #76b900;          /* NVIDIA green */
  --accent-hover: #1eaedb;    /* cyan hover */
  --maxw: 1200px;
  --radius: 2px;
  --shadow: 0 0 5px rgba(0,0,0,0.3);
  --mono: "JetBrains Mono", ui-monospace, "Cascadia Code", Consolas, monospace;
  --sans: "Manrope", system-ui, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg); color: var(--ink);
  font-family: var(--sans); line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }
code, pre { font-family: var(--mono); }
pre.code-block {
  background: var(--bg-soft); border: 1px solid var(--line-dark); border-radius: var(--radius);
  padding: 14px 16px; overflow-x: auto; font-size: 13.5px; line-height: 1.6; margin: 14px 0;
}
pre.code-block code { color: #d7e0ea; background: none; padding: 0; }
:not(pre) > code {
  background: var(--panel-dark); border: 1px solid var(--line-dark);
  padding: 1px 7px; border-radius: var(--radius); font-size: .88em; color: #cfe3b8;
}
h1, h2, h3 { line-height: 1.25; text-wrap: balance; }
h1 { font-size: clamp(2rem, 4.6vw, 3rem); font-weight: 700; letter-spacing: -0.01em; }
h2 { font-size: 1.5rem; font-weight: 700; margin: 40px 0 14px; }
h3 { font-size: 1.12rem; font-weight: 700; margin: 24px 0 10px; }
p { color: var(--ink); margin: 10px 0; text-wrap: pretty; }
ul, ol { margin: 10px 0 10px 22px; }
li { margin: 5px 0; }

/* header / nav — 14px bold uppercase */
.site-head {
  position: sticky; top: 0; z-index: 50;
  background: rgba(0, 0, 0, .94); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line-dark);
}
.site-head .wrap { display: flex; align-items: center; gap: 24px; height: 60px; }
.logo { font-weight: 800; font-size: 17px; color: var(--ink); letter-spacing: .2px; }
.logo .b { color: var(--accent); }
.nav { display: flex; gap: 18px; flex-wrap: wrap; }
.nav a {
  color: var(--ink-2); font-size: 14px; font-weight: 700; text-transform: uppercase; letter-spacing: .04em;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--accent); text-decoration: none; }
.lang-switch { margin-left: auto; }
.lang-switch select {
  background: var(--panel-dark); color: var(--ink); border: 1px solid var(--accent);
  border-radius: var(--radius); padding: 6px 10px; font-size: 13px; font-family: var(--sans);
  cursor: pointer; -webkit-appearance: none; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%2376b900'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 8px center; padding-right: 26px;
}
.lang-switch select:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* hero — dark band */
.hero { padding: 72px 0 48px; background:
  radial-gradient(900px 320px at 15% -10%, rgba(118,185,0,.14), transparent 60%),
  radial-gradient(700px 280px at 85% 0%, rgba(30,174,219,.08), transparent 60%);
  border-bottom: 1px solid var(--line-dark); }
.eyebrow { color: var(--accent); font-weight: 700; font-size: 13px; text-transform: uppercase; letter-spacing: .14em; margin-bottom: 12px; }
.lede { color: var(--ink-2); font-size: 1.13rem; max-width: 860px; margin-top: 14px; }
.unofficial-tag {
  display: inline-block; margin-top: 18px; font-size: 12.5px; color: var(--ink-2);
  border: 1px solid var(--line-dark); border-radius: var(--radius); padding: 3px 12px; background: var(--bg-soft);
}

/* cards & grids — 2-3 column on desktop, light/dark alternating sections */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; margin: 24px 0; }
.card {
  background: var(--panel-dark); border: 1px solid var(--line-dark); border-radius: var(--radius);
  padding: 20px 22px; box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 6px; }
.card p { color: var(--ink-2); font-size: .95rem; margin: 4px 0 0; }
.card a { font-weight: 600; }

/* stats row */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin: 30px 0 6px; }
.stat { background: var(--panel-dark); border: 1px solid var(--line-dark); border-radius: var(--radius); padding: 20px; }
.stat .v { font-size: 2.2rem; font-weight: 700; color: var(--ink); }
.stat .u { color: var(--accent); font-weight: 700; margin-left: 4px; }
.stat .n { color: var(--ink-2); font-size: 12.5px; margin-top: 6px; }

/* callouts */
.note, .warn, .fixbox {
  border: 1px solid var(--line-dark); border-left: 4px solid var(--accent); border-radius: var(--radius);
  padding: 12px 16px; margin: 16px 0; background: var(--bg-soft); font-size: .95rem;
}
.note { border-left-color: var(--accent); }
.warn { border-left-color: #e5484d; }
.fixbox { border-left-color: var(--accent-hover); }
.note strong, .warn strong, .fixbox strong { color: var(--ink); }

/* tables */
table { border-collapse: collapse; width: 100%; margin: 16px 0; font-size: .93rem; }
th, td { border: 1px solid var(--line-dark); padding: 10px 12px; text-align: left; vertical-align: top; }
th { background: var(--panel-dark); color: var(--ink); font-weight: 700; text-transform: uppercase; font-size: 12px; letter-spacing: .04em; }
td { color: var(--ink-2); }
td code { color: #cfe3b8; }

/* breadcrumb */
.crumbs { font-size: 13px; color: var(--ink-2); padding: 18px 0 0; }
.crumbs a { color: var(--ink-2); }
.crumbs a:hover { color: var(--accent); }
.crumbs span { margin: 0 6px; }

/* media embeds */
figure { margin: 20px 0; }
figure img { max-width: 100%; border-radius: var(--radius); border: 1px solid var(--line-dark); display: block; }
figcaption { color: var(--ink-2); font-size: 13px; margin-top: 8px; }
.gifgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.gifgrid figure { margin: 0; }

/* keycap */
.kbd {
  display: inline-block; min-width: 26px; text-align: center; font-family: var(--mono);
  background: var(--panel-dark); border: 1px solid var(--line-dark); border-bottom-width: 3px; border-radius: var(--radius);
  padding: 2px 8px; font-size: 13px; color: var(--ink);
}

/* sections — dark/light rhythm */
section.block { padding: 48px 0; border-bottom: 1px solid var(--line-dark); }
section.block:last-of-type { border-bottom: none; }
/* light section band — reserved for whole-page light themes; keeps dark cards for rhythm.
   When used inside a dark page, it now renders dark (per design review: no white slab in dark page). */
section.block.light {
  background: var(--bg-soft); color: var(--ink);
}
section.block.light h2, section.block.light h3 { color: var(--ink); }
section.block.light p { color: var(--ink-2); }
section.block.light .card { background: var(--panel-dark); border-color: var(--line-dark); box-shadow: var(--shadow); }
section.block.light .card p { color: var(--ink-2); }
section.block.light .card a { color: var(--accent); }
section.block.light td { color: var(--ink-2); }
section.block.light th { background: var(--panel-dark); color: var(--ink); }
section.block.light .btn { border-color: var(--accent); color: var(--ink); }
section.block.light .btn:hover { color: var(--accent-hover); }

/* toc */
.with-toc { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 40px; align-items: start; }
.toc { position: sticky; top: 84px; border-left: 2px solid var(--line-dark); padding-left: 14px; font-size: 13.5px; }
.toc p.tt { font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-2); margin: 6px 0 8px; }
.toc a { display: block; color: var(--ink-2); padding: 3px 0; }
.toc a:hover { color: var(--accent); text-decoration: none; }
@media (max-width: 900px) { .with-toc { grid-template-columns: 1fr; } .toc { position: static; } }

/* skip link */
.skip { position: absolute; left: -9999px; top: 0; background: var(--accent); color: #000; padding: 8px 16px; z-index: 99; font-weight: 700; }
.skip:focus { left: 8px; }

/* footer */
.site-foot { border-top: 1px solid var(--line-dark); background: var(--bg-soft); margin-top: 60px; }
.site-foot .wrap { padding-top: 30px; padding-bottom: 34px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 20px; font-size: 13.5px; margin-bottom: 14px; }
.foot-links a { color: var(--ink-2); }
.foot-links a:hover { color: var(--accent); }
.foot-legal { font-size: 12.5px; color: var(--ink-2); max-width: 960px; line-height: 1.55; }

/* blog list */
.post-list { display: grid; gap: 14px; }
.post-item { background: var(--panel-dark); border: 1px solid var(--line-dark); border-radius: var(--radius); padding: 16px 20px; box-shadow: var(--shadow); }
.post-item h3 { margin: 0 0 4px; font-size: 1.05rem; }
.post-item .meta { color: var(--ink-2); font-size: 12.5px; }
.tag { display: inline-block; font-size: 11.5px; color: var(--accent); border: 1px solid rgba(118,185,0,.4); border-radius: var(--radius); padding: 1px 9px; margin-left: 8px; }

/* buttons — transparent + 2px green border, 2px radius, cyan hover */
.btn {
  display: inline-block; background: transparent; color: var(--ink);
  border: 2px solid var(--accent); border-radius: var(--radius);
  padding: 10px 24px; font-size: 15px; font-weight: 700;
}
.btn:hover { border-color: var(--accent-hover); color: var(--accent-hover); text-decoration: none; }
.btn:active { transform: scale(.98); }
.btn.ghost { border-color: var(--line-dark); color: var(--ink-2); }
.btn.ghost:hover { border-color: var(--accent); color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* FAQ items (NVIDIA-style) */
.faq-item { border: 1px solid var(--line-dark); border-radius: var(--radius); background: var(--bg-soft); margin: 10px 0; }
.faq-item summary { cursor: pointer; padding: 14px 18px; font-weight: 700; color: var(--ink); list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before { content: "+"; color: var(--accent); font-weight: 800; margin-right: 10px; }
.faq-item[open] summary::before { content: "−"; }
.faq-item:hover summary { color: var(--accent); }
.faq-a { padding: 0 18px 16px 18px; color: var(--ink-2); font-size: .95rem; }
.faq-a :global(code) { color: #cfe3b8; }
.faq-a :global(p) { color: var(--ink-2); }

/* responsive nav */
@media (max-width: 860px) {
  .site-head .wrap { flex-wrap: wrap; height: auto; padding: 12px 16px; gap: 12px; }
  .nav { order: 3; width: 100%; gap: 12px; }
  .lang-switch { margin-left: 0; }
}