/* Open Certificate Standard — a specification, so it reads like one.
   Type does the work: a text column at a comfortable measure, generous
   leading, and no ornament competing with the normative language. */
:root {
  --ink: #16181d;
  --ink-soft: #4a5058;
  --rule: #dfe1e6;
  --paper: #fbfbfa;
  --card: #ffffff;
  --accent: #1f4d3d;
  --accent-soft: #eef3f0;
  --measure: 42rem;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #e8e9eb; --ink-soft: #a3a9b2; --rule: #2c3038;
    --paper: #14161a; --card: #1a1d22; --accent: #7fc4a8; --accent-soft: #1d2a25;
  }
}
:root[data-theme="dark"] {
  --ink: #e8e9eb; --ink-soft: #a3a9b2; --rule: #2c3038;
  --paper: #14161a; --card: #1a1d22; --accent: #7fc4a8; --accent-soft: #1d2a25;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.65 ui-serif, Georgia, "Times New Roman", serif;
  -webkit-text-size-adjust: 100%;
}
main, .masthead, footer { max-width: var(--measure); margin: 0 auto; padding: 0 1.25rem; }

.masthead { padding-top: 3.5rem; padding-bottom: 1rem; }
.eyebrow {
  font: 600 13px/1 ui-sans-serif, system-ui, sans-serif;
  letter-spacing: .09em; text-transform: uppercase; color: var(--ink-soft); margin: 0 0 1.25rem;
}
.eyebrow a { color: inherit; text-decoration: none; }
.eyebrow a:hover { color: var(--accent); }
h1 {
  font: 400 2.4rem/1.15 ui-serif, Georgia, serif;
  margin: 0 0 .75rem; letter-spacing: -.015em; text-wrap: balance;
}
.tag {
  display: inline-block; vertical-align: middle;
  font: 600 11px/1 ui-sans-serif, system-ui, sans-serif;
  letter-spacing: .08em; text-transform: uppercase;
  color: var(--accent); background: var(--accent-soft);
  border: 1px solid var(--accent); border-radius: 2px;
  padding: .35rem .5rem; margin-left: .5rem;
}
.lede { color: var(--ink-soft); font-size: 1.05rem; margin: 0 0 1rem; }

section { padding: 2rem 0; border-top: 1px solid var(--rule); }
h2 {
  font: 600 1.05rem/1.3 ui-sans-serif, system-ui, sans-serif;
  letter-spacing: .01em; margin: 0 0 1rem; color: var(--ink);
}
h3 {
  font: 600 .92rem/1.3 ui-sans-serif, system-ui, sans-serif;
  letter-spacing: .04em; text-transform: uppercase; color: var(--ink-soft);
  margin: 2rem 0 .75rem;
}
p { margin: 0 0 1rem; }
a { color: var(--accent); text-underline-offset: .18em; }

code, pre {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: .86em;
}
code { background: var(--card); border: 1px solid var(--rule); border-radius: 3px; padding: .1em .35em; }
pre {
  background: var(--card); border: 1px solid var(--rule); border-radius: 4px;
  padding: 1rem; overflow-x: auto; line-height: 1.55;
}
pre code { background: none; border: 0; padding: 0; }

.callout {
  background: var(--accent-soft); border-left: 3px solid var(--accent);
  padding: .9rem 1rem; margin: 1.25rem 0; font-size: .97rem;
}

ol.rules { padding-left: 1.3rem; }
ol.rules li { margin-bottom: .85rem; }
ul { padding-left: 1.3rem; }
li { margin-bottom: .5rem; }

/* Tables carry the criteria, so they must survive a phone. */
table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: .95rem; display: block; overflow-x: auto; }
th, td { text-align: left; padding: .6rem .7rem; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font: 600 .8rem/1.3 ui-sans-serif, system-ui, sans-serif; letter-spacing: .05em; text-transform: uppercase; color: var(--ink-soft); }
td:first-child { white-space: nowrap; font-family: ui-monospace, monospace; font-size: .85em; color: var(--accent); }

footer {
  border-top: 1px solid var(--rule); margin-top: 2rem;
  padding-top: 1.5rem; padding-bottom: 4rem;
  font: 400 .9rem/1.6 ui-sans-serif, system-ui, sans-serif; color: var(--ink-soft);
}
footer p { margin: 0 0 .35rem; }