/* nightsky.observer
   Palette and type follow fschuindt.722.network (Poole): white, #515151 body,
   #313131 headings, system sans; links and accents in #7f112b. Dark theme is the same page
   with the paper swapped. */

:root {
  --bg: #fff;
  --text: #515151;
  --heading: #313131;
  --muted: #9a9a9a;
  --rule: #e5e5e5;
  --code-bg: #f9f9f9;
  --code: #bf616a;
  --link: #7f112b;
  --table-stripe: #f9f9f9;

  --chart-accent: #7f112b;
  --chart-bar: #d5d5d5;
  --chart-dim: #8c8c8c;
  --chart-text: #313131;
  --chart-muted: #767676;
  --chart-grid: #e5e5e5;
  --chart-paper: #fff;

  --max: 52rem;
  --logo-plate: transparent;
  --card-bg: #f9f9f9;
  --card-text: #515151;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", Arial, sans-serif;
  --mono: Menlo, Monaco, "Courier New", monospace;
  color-scheme: light;
}

html[data-theme="dark"] {
  --bg: #161616;
  --logo-plate: #e6e6e6;
  --card-bg: #e6e6e6;
  --card-text: #313131;
  --text: #bdbdbd;
  --heading: #e4e4e4;
  --muted: #7d7d7d;
  --rule: #2c2c2c;
  --code-bg: #1f1f1f;
  --code: #d98b93;
  --link: #d4657d;
  --table-stripe: #1c1c1c;

  --chart-accent: #d4657d;
  --chart-bar: #3a3a3a;
  --chart-dim: #8a8a8a;
  --chart-text: #e4e4e4;
  --chart-muted: #8f8f8f;
  --chart-grid: #2c2c2c;
  --chart-paper: #161616;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  /* Reserve the scrollbar's width on every page, so the centred column does
     not jump between short pages (no scrollbar) and long ones. */
  overflow-y: scroll;
  scrollbar-gutter: stable;
}
@media (min-width: 38em) { html { font-size: 20px; } }

body {
  margin: 0;
  background-color: var(--bg);
  color: var(--text);
}

.container {
  max-width: var(--max);
  padding: 0 1rem;
  margin: 0 auto;
}

a { color: var(--link); text-decoration: none; }
a:hover, a:focus { text-decoration: underline; }
a strong { color: inherit; }

img { max-width: 100%; height: auto; }

h1, h2, h3, h4 {
  margin: 0 0 .5rem;
  font-weight: 600;
  line-height: 1.25;
  color: var(--heading);
  text-rendering: optimizeLegibility;
}
h1 { font-size: 2rem; }
h2 { margin-top: 1rem; font-size: 1.5rem; }
h3 { margin-top: 1.5rem; font-size: 1.25rem; }
p { margin: 0 0 1rem; }
strong { color: var(--heading); }
ul, ol { margin: 0 0 1rem; }
li + li { margin-top: .25rem; }
hr { margin: 1.5rem 0; border: 0; border-top: 1px solid var(--rule); }

code, pre { font-family: var(--mono); }
code { padding: .25em .5em; font-size: 85%; color: var(--code); background-color: var(--code-bg); border-radius: 3px; }
pre { display: block; margin: 0 0 1rem; padding: 1rem; font-size: .8rem; line-height: 1.4; white-space: pre; overflow-x: auto; background-color: var(--code-bg); }
pre code { padding: 0; font-size: 100%; color: inherit; background: none; }

table { margin-bottom: 1rem; width: 100%; font-size: 85%; border: 1px solid var(--rule); border-collapse: collapse; }
td, th { padding: .25rem .5rem; border: 1px solid var(--rule); }
th { text-align: left; }
tbody tr:nth-child(odd) td, tbody tr:nth-child(odd) th { background-color: var(--table-stripe); }

/* Masthead */

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1rem;
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--rule);
}
/* The logo is black line art on a white ground, so it sits on its own light
   plate that never changes with the theme. */
.masthead-logo {
  display: block;
  line-height: 0;
  padding: .7rem .9rem;
  background: var(--logo-plate);
  border-radius: 6px;
}
.masthead-logo img { height: 4.4rem; width: auto; }

.masthead-nav { display: flex; align-items: center; gap: 1rem; font-size: 85%; }
.masthead-nav a.current { color: var(--heading); }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.7rem;
  height: 1.7rem;
  padding: 0;
  border: 1px solid var(--rule);
  border-radius: 50%;
  background: none;
  color: var(--text);
  cursor: pointer;
  font: inherit;
}
.theme-toggle:hover { border-color: var(--muted); color: var(--heading); }
.theme-toggle svg { width: .95rem; height: .95rem; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.theme-toggle .icon-moon { display: none; }
html[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* Landing */

.lede { font-size: 1.15rem; line-height: 1.4; }
/* Landing: one clickable card per product */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, 15rem);
  gap: 1rem;
  margin: 1.5rem 0;
}
.card {
  display: block;
  padding: 1.1rem 1.1rem 1.2rem;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--card-bg);
  color: var(--card-text);
  text-align: center;
  text-decoration: none;
  transition: border-color .15s, transform .15s;
}
.card:hover, .card:focus { text-decoration: none; border-color: var(--link); transform: translateY(-1px); }
.card-logo { display: block; line-height: 0; }
.card-logo img { height: 1.7rem; width: auto; position: relative; left: -.2rem; } /* optical: the eye is lighter than the wordmark */
.card p { margin: .8rem 0 0; color: inherit; font-size: .9rem; }
.aside { color: var(--muted); font-size: 85%; }

/* Product page */

.product-head { margin: 1.4rem 0 0; }
.product-head h1 { margin-bottom: .6rem; font-size: 2.4rem; letter-spacing: -.01em; }
/* Same treatment as the masthead logo: one image, on a light plate in the
   dark theme, transparent in the light one. */
.product-head .product-logo {
  display: inline-block;
  margin: 0 0 1.2rem;
  padding: .55rem .75rem;
  line-height: 0;
  background: var(--logo-plate);
  border-radius: 6px;
}
.product-head .product-logo img { height: 2rem; width: auto; }
.product-head .tagline {
  margin: 0 0 .15rem;
  font-size: 1.05rem;
  line-height: 1.4;
  font-weight: 500;
  color: var(--heading);
}
.product-head .subline {
  margin: 0;
  font-size: .9rem;
  line-height: 1.4;
  color: var(--muted);
}
.beta-note {
  margin: 2rem 0 0;
  padding: .5rem .8rem;
  font-size: .85rem;
  color: var(--text);
  background: var(--code-bg);
  border-left: 3px solid var(--heading);
  border-radius: 0 4px 4px 0;
}
.beta-note strong { color: var(--heading); }
.product-head .product-links { margin: 1.2rem 0 0; }
.product-head .claim { margin: 1.2rem 0 0; font-size: .9rem; line-height: 1.4; color: var(--muted); }
.gh-button {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .45rem .9rem;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--code-bg);
  color: var(--heading);
  font-size: .8rem;
  font-weight: 500;
  line-height: 1;
  text-decoration: none;
}
.gh-button:hover, .gh-button:focus { text-decoration: none; border-color: var(--link); color: var(--link); }
.gh-button svg { width: 1.1rem; height: 1.1rem; fill: currentColor; flex: none; }

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(7.5rem, 1fr));
  gap: .8rem 1rem;
  margin: 2rem 0 2.25rem;
  padding: 1rem 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.stat .v { font-size: 1.6rem; line-height: 1.1; font-weight: 600; color: var(--heading); font-variant-numeric: tabular-nums; }
.stat .k { font-size: 75%; color: var(--muted); margin-top: .15rem; }

.bench-note { font-size: .85rem; color: var(--muted); }
figure.chart-figure { margin: 1.5rem 0 2rem; }
figure.chart-figure svg.chart { display: block; width: 100%; height: auto; }
figure.chart-figure figcaption { font-size: 85%; color: var(--muted); margin-top: .4rem; }
svg.chart text { font-family: var(--sans); }

/* Footer */

.footer { margin-top: 3rem; padding: 1rem 0 2rem; border-top: 1px solid var(--rule); color: var(--muted); font-size: 80%; }
.footer a { color: var(--link); }

@media (max-width: 30em) {
  .masthead { flex-wrap: wrap; }
  .masthead-logo { padding: .5rem .6rem; }
  .masthead-logo img { height: 2.9rem; }
}