@font-face {
  font-family: "Fira Code";
  src:
    local("Fira Code"),
    url("../../style/FiraCode-Regular.Z.woff2") format("woff2");
  font-style: normal;
}

@font-face {
  font-family: "Merriweather";
  src:
    local("Merriweather"),
    url("../../style/Merriweather-Regular.ttf") format("truetype");
  font-style: normal;
}

:root {
  --paper: #f1f0ec;
  --ink: #292d2b;
  --line: #d0d1cb;
  --soft-2: #ebeae6;
  --link: #50676d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Raleway", "Times New Roman", serif;
  font-size: 17pt;
  font-weight: lighter;
  line-height: 1.58;
}

main {
  width: min(92%, 45rem);
  margin: 0 auto;
  padding: 3rem 0 4rem;
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.14em;
}

code,
.visual-directive,
.formula,
pre {
  font-family: "Fira Code", monospace;
}

code {
  font-size: 0.86em;
}

.home-link {
  font-size: 0.78em;
}

.post-header {
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--line);
}

h1,
h2 {
  font-family: "Merriweather", serif;
  font-weight: normal;
}

h1 {
  margin: 3.5rem 0 1.2rem;
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  line-height: 1.02;
  letter-spacing: -0.025em;
}

h2 {
  margin: 0 0 1rem;
  font-size: 1.35em;
}

.agent-note {
  max-width: 39rem;
}

.agent-note p {
  margin: 0 0 0.85em;
}

.source {
  margin-top: 1.2rem;
}

.opening-unit {
  margin: 0;
  padding: 1.25rem 0 1.35rem;
  border-bottom: 1px solid var(--line);
  font-size: 1.03em;
}

.unit,
.key-unit,
.caution {
  margin: 0;
  padding: 1.15rem 0 1.25rem;
  border-bottom: 1px solid var(--line);
}

.key-unit {
  margin: 0.35rem -1rem;
  padding: 1.2rem 1rem 1.3rem;
  background: var(--soft-2);
  border-bottom: 0;
}

.caution {
  margin: 0.35rem 0;
  padding-left: 1rem;
  border-left: 2px solid #9c9a8d;
}

.formula {
  margin: 0.9rem 0 0.2rem;
  padding: 0.7rem 0.9rem;
  background: #dfdfda;
  font-size: 0.82em;
  overflow-x: auto;
}

pre {
  margin: 1.4rem 0;
  padding: 0.95rem 1rem;
  background: #383d3a;
  color: #ecece8;
  font-size: 0.76em;
  line-height: 1.55;
  overflow-x: auto;
  border-radius: 0.15rem;
}

pre code {
  color: inherit;
  font-size: 1em;
}

.visual-directive {
  margin: 2.2rem 0;
  padding: 1.35rem 1rem;
  border: 1px dashed #aeb1ac;
  color: #606660;
  text-align: center;
  font-size: 0.72em;
  letter-spacing: 0.025em;
  background: rgba(255, 255, 255, 0.18);
}

.references {
  margin-top: 3.7rem;
  padding-top: 2rem;
  border-top: 1px solid #bfc1bb;
}

.reference {
  padding: 1.25rem 0 1.4rem;
  border-bottom: 1px solid var(--line);
}

.reference b {
  font-weight: 600;
}

.reference p {
  margin: 0.55em 0;
}

footer {
  margin-top: 3rem;
  padding-top: 1.3rem;
  border-top: 1px solid var(--line);
  font-family: "Fira Code", monospace;
  font-size: 0.7em;
}

@media (max-width: 700px) {
  body {
    font-size: 16pt;
  }

  main {
    width: min(91%, 40rem);
    padding-top: 2rem;
  }

  h1 {
    margin-top: 2.5rem;
  }

  .key-unit {
    margin-left: -0.6rem;
    margin-right: -0.6rem;
    padding-left: 0.6rem;
    padding-right: 0.6rem;
  }

  .visual-directive {
    overflow-wrap: anywhere;
  }
}