/* Keep Your Head — editorial stylesheet.
   Restrained by design: two typefaces, one accent, lots of air. */

:root {
  --paper: #faf8f4;
  --ink: #24272b;
  --ink-soft: #5b6066;
  --accent: #2f6457;      /* calm deep green — links, buttons */
  --accent-dark: #244f45;
  --rule: #e4dfd6;
  --code-bg: #f0ede6;
  --max-width: 41rem;
}

* { box-sizing: border-box; }

html { font-size: 17px; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Charter, "Bitstream Charter", Cambria, Georgia, serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ---- layout ---- */

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

header.site {
  border-bottom: 1px solid var(--rule);
  padding: 1.1rem 0;
}

header.site .wrap {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}

.wordmark {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
  text-decoration: none;
  color: var(--ink);
}

.wordmark span { color: var(--accent); }

nav.site a {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 0.85rem;
  color: var(--ink-soft);
  text-decoration: none;
  margin-left: 1.1rem;
}

nav.site a:hover, nav.site a[aria-current="page"] { color: var(--accent-dark); }

main { padding: 2.5rem 0 3.5rem; }

footer.site {
  border-top: 1px solid var(--rule);
  padding: 1.6rem 0 2.4rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 0.82rem;
  color: var(--ink-soft);
}

footer.site a { color: var(--ink-soft); }

/* ---- type ---- */

h1, h2, h3 {
  line-height: 1.25;
  letter-spacing: -0.01em;
}

h1 { font-size: 1.9rem; margin: 0 0 0.75rem; }
h2 { font-size: 1.25rem; margin: 2.2rem 0 0.6rem; }
h3 { font-size: 1.02rem; margin: 1.6rem 0 0.4rem; }

p { margin: 0 0 1.05rem; }

a { color: var(--accent); }
a:hover { color: var(--accent-dark); }

.kicker {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--ink-soft);
  margin: 0 0 0.6rem;
}

.lede { font-size: 1.12rem; color: var(--ink-soft); margin-bottom: 1.6rem; }

.byline {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin-bottom: 2rem;
}

ul, ol { padding-left: 1.3rem; margin: 0 0 1.05rem; }
li { margin-bottom: 0.35rem; }

blockquote {
  margin: 1.4rem 0;
  padding: 0.1rem 0 0.1rem 1.1rem;
  border-left: 3px solid var(--accent);
  color: var(--ink-soft);
  font-style: italic;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.55;
  margin: 1.1rem 0 1.3rem;
}

code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88em;
}

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 2.2rem 0;
}

/* ---- keep-your-head note ---- */

.kyh-note {
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1rem 1.2rem;
  margin: 2rem 0;
}

.kyh-note .label {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--accent);
  display: block;
  margin-bottom: 0.3rem;
}

.kyh-note p { margin: 0; }

/* ---- signup ---- */

.signup {
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 1.5rem 1.4rem;
  margin: 2.4rem 0 0;
}

.signup h2 { margin-top: 0; }

.signup p { color: var(--ink-soft); font-size: 0.95rem; }

.signup form {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: 0.9rem;
}

.signup input[type="email"] {
  flex: 1 1 14rem;
  font: inherit;
  font-size: 0.95rem;
  padding: 0.6rem 0.8rem;
  border: 1px solid #c9c3b8;
  border-radius: 6px;
  background: var(--paper);
}

.signup button {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 0.92rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: 0;
  border-radius: 6px;
  padding: 0.6rem 1.2rem;
  cursor: pointer;
}

.signup button:hover { background: var(--accent-dark); }

.signup .fineprint { font-size: 0.78rem; margin: 0.7rem 0 0; }

/* ---- article index cards ---- */

.article-list { list-style: none; padding: 0; margin: 1.4rem 0 0; }

.article-list li {
  border-top: 1px solid var(--rule);
  padding: 1.15rem 0;
  margin: 0;
}

.article-list a {
  font-weight: 700;
  font-size: 1.08rem;
  text-decoration: none;
  color: var(--ink);
}

.article-list a:hover { color: var(--accent-dark); }

.article-list p { margin: 0.35rem 0 0; color: var(--ink-soft); font-size: 0.95rem; }

/* ---- small screens ---- */

@media (max-width: 480px) {
  html { font-size: 16px; }
  h1 { font-size: 1.6rem; }
  nav.site a { margin-left: 0.8rem; }
}