/* Valun landing (public/home.html, the home page of valun.tech): one dark theme, from 360px up. Fonts are self-hosted
   (public/fonts, SIL OFL): the CSP allows no external font. */
@font-face { font-family: "Jost"; font-style: normal; font-weight: 100 900; font-display: swap; src: url("/fonts/jost-latin.woff2") format("woff2"); }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 400; font-display: swap; src: url("/fonts/jetbrains-mono-latin-400.woff2") format("woff2"); }

:root {
  --space: #050608;
  --line: #eef0f4;
  --dust: #8a909c;
  --rule: #1b1e26;
  --rainbow: linear-gradient(90deg, #ff5a5f, #ffc145, #3ddc97, #4f7cff, #9b5cff);
  --sans: "Jost", "Futura", "Century Gothic", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "Cascadia Mono", Consolas, "SFMono-Regular", Menlo, monospace;
  color-scheme: dark;
}
/* One theme: the dark field, with explicit colors, whatever the system theme. */

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; background: var(--space); scroll-behavior: smooth; }
body { margin: 0; background: var(--space); color: var(--line); font: 300 17px/1.6 var(--sans); overflow-x: hidden; }
a { color: var(--line); text-decoration-color: var(--dust); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--line); }
:focus-visible { outline: 1.5px solid var(--line); outline-offset: 3px; }
main, .top, .foot { max-width: 1120px; margin: 0 auto; padding-left: 16px; padding-right: 16px; }
code, pre { font-family: var(--mono); font-weight: 400; }
p code, li code { font-size: 0.86em; color: var(--line); background: none; border: 1px solid var(--rule); padding: 0.05em 0.4em; border-radius: 3px; overflow-wrap: anywhere; }
.eyebrow { font: 400 0.72rem/1.4 var(--mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--dust); margin: 0 0 1.6rem; }

/* header */
.top { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-top: 22px; padding-bottom: 10px; }
.brand { display: inline-flex; align-items: center; gap: 0.75rem; color: var(--line); text-decoration: none; }
.mark { width: 26px; height: 26px; display: block; flex: none; }
.wordmark { font-weight: 300; font-size: 0.98rem; letter-spacing: 0.5em; text-transform: uppercase; margin-right: -0.5em; }
.top nav { display: flex; gap: 1.4rem; font-size: 0.92rem; font-weight: 400; }
.top nav a { color: var(--dust); text-decoration: none; }
.top nav a:hover { color: var(--line); }

/* hero */
.hero { display: grid; grid-template-columns: minmax(0, 1fr); gap: 1.6rem; padding: 2.6rem 0 3rem; }
.hero h1 { margin: 0 0 1.4rem; font-weight: 300; font-size: clamp(2rem, 8.6vw, 4.6rem); line-height: 1.08; letter-spacing: -0.015em; }
.hero h1 .h1a, .hero h1 .h1b { display: block; }
.h1b { color: var(--dust); }
.settle { display: inline; white-space: nowrap; padding-bottom: 0.08em; background-image: var(--rainbow); background-repeat: no-repeat; background-position: 0 100%; background-size: 100% 2px; }
.lede { font-size: 1.12rem; max-width: 34em; margin: 0 0 1.8rem; color: var(--line); }
.cta { display: flex; flex-wrap: wrap; gap: 0.8rem; }
.btn { display: inline-block; padding: 0.7em 1.3em; border: 1px solid var(--dust); border-radius: 2px; color: var(--line); text-decoration: none;
  font-weight: 400; font-size: 0.98rem; letter-spacing: 0.02em; transition: border-color .2s, background-color .2s, color .2s; }
.btn:hover { border-color: var(--line); }
.btn.primary { background: var(--line); border-color: var(--line); color: var(--space); }
.btn.primary:hover { background: #ffffff; }

/* the constellation */
.sky { margin: 0; min-width: 0; }
.sky-box { position: relative; width: 100%; aspect-ratio: 1 / 1; max-height: 78vh; }
#sky { display: block; width: 100%; height: 100%; touch-action: manipulation; }
.sky figcaption { border-top: 1px solid var(--rule); padding-top: 0.9rem; margin-top: 0.4rem; }
.stats { margin: 0 0 0.4rem; font: 400 0.82rem/1.5 var(--mono); color: var(--line); font-variant-numeric: tabular-nums; }
.caption { margin: 0; color: var(--dust); font-size: 0.9rem; max-width: 40em; }

/* sections */
.how, .play, .recent { border-top: 1px solid var(--rule); padding: 3rem 0 2.6rem; }
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: minmax(0, 1fr); gap: 2.4rem; }
.steps h3 { font-weight: 400; font-size: 1.22rem; margin: 0.9rem 0 0.4rem; letter-spacing: 0; }
.steps p { margin: 0; color: var(--dust); max-width: 30em; }
.diagram { display: block; width: 100%; max-width: 260px; height: auto; }
.diagram .dl { fill: var(--line); font: 400 11px var(--mono); }
.diagram .dn { fill: var(--dust); font: 400 10px var(--mono); letter-spacing: 0.08em; }
.diagram .dd { fill: var(--dust); font: 400 10px var(--mono); letter-spacing: 0.08em; }
.play p { margin: 0 0 1rem; max-width: 44em; }
.list { margin: 0 0 1.4rem; padding: 0; list-style: none; counter-reset: n; max-width: 44em; }
.list li { counter-increment: n; position: relative; padding: 0.55rem 0 0.55rem 2.6rem; border-bottom: 1px solid var(--rule); }
.list li::before { content: counter(n, decimal-leading-zero); position: absolute; left: 0; top: 0.75rem; font: 400 0.74rem/1 var(--mono); color: var(--dust); letter-spacing: 0.08em; }
.small { font-size: 0.92rem; color: var(--dust); }
.cmd { position: relative; margin: 0 0 1.2rem; max-width: 44em; }
.cmd pre { margin: 0; background: #0a0c10; color: var(--line); border: 1px solid var(--rule); border-radius: 2px; padding: 16px 18px; padding-right: 84px;
  overflow-x: auto; font-size: 0.86rem; line-height: 1.8; }
.cmd code { font-size: inherit; }
.copy { position: absolute; top: 10px; right: 10px; font: 400 0.7rem/1 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; padding: 0.6em 0.8em;
  border-radius: 2px; border: 1px solid var(--rule); background: var(--space); color: var(--dust); cursor: pointer; }
.copy:hover { color: var(--line); border-color: var(--dust); }

/* recent loops */
.loops { list-style: none; margin: 0 0 1.4rem; padding: 0; }
.loops li { border-bottom: 1px solid var(--rule); }
.loops li:first-child { border-top: 1px solid var(--rule); }
.loops a { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 0.2rem 1.2rem; padding: 0.85rem 0; color: var(--line); text-decoration: none; }
.loops a:hover .path { text-decoration: underline; text-decoration-color: var(--dust); text-underline-offset: 4px; }
.loops .path { font: 400 0.9rem/1.5 var(--mono); overflow-wrap: anywhere; min-width: 0; }
.loops .meta { color: var(--dust); font-size: 0.88rem; white-space: nowrap; }
.loops .meta .n { font-family: var(--mono); color: var(--line); }
.loops .empty { color: var(--dust); padding: 0.85rem 0; }
.more { color: var(--dust); text-decoration: none; font-size: 0.95rem; }
.more:hover { color: var(--line); }

/* footer */
.foot { color: var(--dust); font-size: 0.88rem; border-top: 1px solid var(--rule); padding-top: 1.6rem; padding-bottom: 3rem; }
.foot p { margin: 0 0 0.6rem; max-width: 44em; }
.foot .links { display: flex; flex-wrap: wrap; gap: 0.4rem 1.4rem; }
.foot a { color: var(--dust); }
.foot a:hover { color: var(--line); }

@media (min-width: 720px) {
  .steps { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2.4rem; }
}
@media (min-width: 960px) {
  .hero { grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); align-items: center; gap: 3rem; padding-top: 3.6rem; }
  .hero h1 { font-size: clamp(2.4rem, 3.6vw, 3.5rem); }
  .lede { font-size: 1.18rem; }
}
@media (max-width: 480px) {
  body { font-size: 16px; }
  .top nav { gap: 1rem; font-size: 0.88rem; }
  .wordmark { letter-spacing: 0.4em; margin-right: -0.4em; }
  .cmd pre { font-size: 0.76rem; padding: 44px 14px 14px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}