:root {
  --bg: #07111f; --panel: #0d1b2e; --line: #1d3250; --text: #d5dfec; --dim: #8197b3;
  --accent: #27d9a8; --cyan: #6ec1ff; --green: #5fff87; --warn: #ffd75f;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, "DejaVu Sans Mono", monospace;
}
* { box-sizing: border-box; }
html { background: var(--bg); }
body {
  margin: 0 auto; max-width: 980px; padding: 0 1.2rem 4rem; color: var(--text);
  font: 16px/1.6 var(--mono); background: var(--bg);
}
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { color: #fff; line-height: 1.25; margin-top: 2.2em; }
h1 { font-size: 2rem; } h2 { font-size: 1.4rem; border-bottom: 1px solid var(--line); padding-bottom: .3em; }
h2::before { content: "\2503 "; color: var(--accent); }
code { background: var(--panel); border: 1px solid var(--line); border-radius: 4px; padding: .05em .35em; font-family: var(--mono); font-size: .92em; color: var(--green); }
pre { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 1rem; overflow-x: auto; line-height: 1.35; }
pre code { background: none; border: 0; padding: 0; color: var(--text); font-size: .88em; }
table { border-collapse: collapse; display: block; overflow-x: auto; margin: 1rem 0; }
th, td { border: 1px solid var(--line); padding: .4rem .7rem; text-align: left; vertical-align: top; }
th { background: var(--panel); color: var(--cyan); }
blockquote { border-left: 3px solid var(--accent); margin-left: 0; padding-left: 1rem; color: var(--dim); }
img { max-width: 100%; }
nav.top { display: flex; flex-wrap: wrap; gap: 1.2rem; align-items: center; padding: 1rem 0; border-bottom: 1px solid var(--line); }
nav.top .brand { color: var(--accent); font-weight: 700; font-size: 1.1rem; margin-right: auto; }
header#title-block-header h1.title { margin-top: 1.2rem; }
#TOC { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: .5rem 1.2rem; }
#TOC ul { list-style: none; padding-left: 1rem; } #TOC > ul { padding-left: 0; }

/* landing page */
.hero { padding: 3rem 0 1rem; text-align: center; }
.hero h1 { font-size: 3.2rem; margin: 0; letter-spacing: .05em; color: var(--accent); }
.hero .logo { display: block; width: min(640px, 100%); margin: 1rem auto 0; border-radius: 14px; border: 1px solid var(--line); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: .6rem; margin: 1rem 0; }
.gallery img { width: 100%; height: 130px; object-fit: cover; border-radius: 8px; border: 1px solid var(--line); transition: transform .15s; }
.gallery a:hover img { transform: scale(1.03); }
.hero p { color: var(--dim); max-width: 42rem; margin: .8rem auto; }
.badge { display: inline-block; border: 1px solid var(--line); border-radius: 999px; padding: .1rem .8rem; color: var(--cyan); font-size: .85rem; }
.cta { display: flex; gap: .8rem; justify-content: center; flex-wrap: wrap; margin: 1.4rem 0; }
.cta a { border: 1px solid var(--accent); color: var(--accent); padding: .5rem 1.1rem; border-radius: 6px; }
.cta a.primary { background: var(--accent); color: #04110d; font-weight: 700; }
.cta a:hover { text-decoration: none; filter: brightness(1.15); }
.term { background: #050c16; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; margin: 1.6rem 0; }
.term .bar { background: var(--panel); padding: .35rem .8rem; color: var(--dim); font-size: .8rem; border-bottom: 1px solid var(--line); }
.bars { display: flex; align-items: flex-end; gap: 3px; height: 150px; padding: 12px 14px 0; }
.bars i { flex: 1; min-width: 3px; border-radius: 2px 2px 0 0; background: linear-gradient(to top, #00c846, #bedc00 55%, #ffc800 75%, #ff3c00);
  transform-origin: bottom; animation: bounce 1.2s ease-in-out infinite alternate; }
@keyframes bounce { from { transform: scaleY(.08); } to { transform: scaleY(1); } }
.term pre { border: 0; border-radius: 0; margin: 0; background: transparent; color: var(--dim); }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1rem; margin: 1rem 0; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 1rem 1.2rem; }
.card h3 { margin: 0 0 .4rem; font-size: 1rem; color: var(--cyan); }
.card p { margin: 0; color: var(--dim); font-size: .92rem; }
.tabs { display: flex; gap: .4rem; flex-wrap: wrap; margin-top: 1rem; }
.tabs button { background: var(--panel); color: var(--dim); border: 1px solid var(--line); border-radius: 6px 6px 0 0; padding: .4rem .9rem; font: inherit; cursor: pointer; }
.tabs button.on { color: #111; background: var(--cyan); border-color: var(--cyan); }
.pane { display: none; } .pane.on { display: block; }
footer { margin-top: 4rem; color: var(--dim); font-size: .85rem; text-align: center; border-top: 1px solid var(--line); padding-top: 1rem; }
@media (max-width: 600px) { .hero h1 { font-size: 2.2rem; } body { font-size: 15px; } }
@media (prefers-reduced-motion: reduce) { .bars i { animation: none; transform: scaleY(.5); } }