/* ============================================================
   5jkl.dk — shared stylesheet
   Palette lifted from an SDR waterfall display:
   deep blue noise floor, amber/yellow signal traces.
   ============================================================ */
:root {
  --noise-floor: #08111f;   /* page background */
  --noise-deep:  #0c1a30;   /* panel background */
  --grid-line:   #16283f;   /* borders, rules */
  --text:        #d7e1ec;   /* primary text */
  --text-dim:    #7d8fa5;   /* secondary text */
  --signal:      #ffb62b;   /* amber signal accent */
  --signal-hot:  #ffd97a;   /* bright signal / hover */
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --sans: "IBM Plex Sans", system-ui, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--noise-floor);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--signal); text-decoration: none; }
a:hover, a:focus-visible { color: var(--signal-hot); text-decoration: underline; text-underline-offset: 3px; }
a:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; border-radius: 2px; }

.wrap { max-width: 760px; margin: 0 auto; padding: 0 24px; }

/* ---------- header + nav ---------- */
header {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 20px 0; border-bottom: 1px solid var(--grid-line);
  font-family: var(--mono); font-size: 14px;
}
header .call { font-weight: 700; letter-spacing: 0.08em; }
header .call a { color: var(--text); }
header .call a:hover, header .call a:focus-visible { color: var(--signal-hot); text-decoration: none; }
header nav { display: flex; gap: 20px; }
header nav a { color: var(--text-dim); }
header nav a:hover, header nav a:focus-visible { color: var(--signal-hot); text-decoration: none; }
header nav a[aria-current="page"] { color: var(--signal); }

/* ---------- hero (front page) ---------- */
.hero { padding: 72px 0 24px; }

.hero h1 {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(2.2rem, 6vw, 3.4rem);
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.hero .callsign {
  color: var(--signal);
  display: block;
  font-size: clamp(1.1rem, 3vw, 1.4rem);
  letter-spacing: 0.25em;
  margin-bottom: 14px;
}
/* the callsign in morse, echoing the waterfall trace */
.morse {
  font-family: var(--mono);
  color: var(--text-dim);
  font-size: 12px;
  letter-spacing: 0.15em;
  margin-top: 18px;
  user-select: none;
}
.hero p.tagline {
  margin-top: 22px;
  font-size: 1.15rem;
  color: var(--text-dim);
  max-width: 34ch;
}

/* ---------- waterfall ---------- */
.waterfall {
  margin: 48px 0 0;
  border: 1px solid var(--grid-line);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
  background: var(--noise-deep);
}
.waterfall canvas { display: block; width: 100%; height: 180px; }
.waterfall .freq-label {
  position: absolute; top: 8px; right: 10px;
  font-family: var(--mono); font-size: 11px;
  color: var(--text-dim); letter-spacing: 0.1em;
  background: rgba(8, 17, 31, 0.6);
  padding: 2px 6px; border-radius: 2px;
}

/* ---------- sections (front page) ---------- */
section { padding: 56px 0 0; }
section:last-of-type { padding-bottom: 72px; }

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--signal);
  margin-bottom: 14px;
}
section p { color: var(--text); max-width: 60ch; }
section p + p { margin-top: 14px; }
.dim { color: var(--text-dim); }

.linkrow { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 12px; }
.linkrow a {
  font-family: var(--mono); font-size: 14px;
  border: 1px solid var(--grid-line);
  padding: 8px 14px; border-radius: 4px;
  color: var(--text);
  transition: border-color 0.15s ease, color 0.15s ease;
}
.linkrow a:hover, .linkrow a:focus-visible {
  border-color: var(--signal); color: var(--signal-hot); text-decoration: none;
}

/* ---------- blog index ---------- */
.page-title {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  letter-spacing: -0.02em;
  padding: 56px 0 8px;
}
.page-intro { color: var(--text-dim); max-width: 55ch; }

.post-list { list-style: none; padding: 32px 0 72px; }
.post-list li {
  border-top: 1px solid var(--grid-line);
  padding: 24px 0;
}
.post-list li:last-child { border-bottom: 1px solid var(--grid-line); }
.post-list time {
  font-family: var(--mono); font-size: 13px;
  color: var(--text-dim); display: block; margin-bottom: 4px;
}
.post-list h2 { font-size: 1.25rem; font-weight: 600; line-height: 1.35; }
.post-list h2 a { color: var(--text); }
.post-list h2 a:hover, .post-list h2 a:focus-visible { color: var(--signal-hot); text-decoration: none; }
.post-list p { color: var(--text-dim); margin-top: 6px; max-width: 60ch; }

/* ---------- single post ---------- */
article.post { padding: 56px 0 72px; }
article.post > time {
  font-family: var(--mono); font-size: 13px;
  color: var(--text-dim); display: block; margin-bottom: 10px;
}
article.post h1 {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(1.7rem, 5vw, 2.3rem);
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 8px;
}
article.post .post-description {
  color: var(--text-dim); font-size: 1.05rem; max-width: 60ch;
  padding-bottom: 24px; border-bottom: 1px solid var(--grid-line);
  margin-bottom: 32px;
}

/* markdown body */
.post-body h2 {
  font-family: var(--mono); font-size: 1.15rem; font-weight: 700;
  color: var(--signal); margin: 40px 0 12px;
}
.post-body h3 {
  font-size: 1.05rem; font-weight: 600; margin: 28px 0 10px;
}
.post-body p { margin: 0 0 16px; max-width: 66ch; }
.post-body ul, .post-body ol { margin: 0 0 16px; padding-left: 26px; max-width: 62ch; }
.post-body li { margin-bottom: 6px; }
.post-body strong { color: var(--signal-hot); font-weight: 600; }
.post-body code {
  font-family: var(--mono); font-size: 0.88em;
  background: var(--noise-deep);
  border: 1px solid var(--grid-line);
  border-radius: 3px; padding: 1px 6px;
}
.post-body pre {
  background: var(--noise-deep);
  border: 1px solid var(--grid-line);
  border-radius: 4px;
  padding: 16px; margin: 0 0 16px;
  overflow-x: auto;
  font-size: 14px; line-height: 1.55;
}
.post-body pre code { background: none; border: none; padding: 0; }
.post-body blockquote {
  border-left: 3px solid var(--signal);
  padding: 4px 0 4px 16px; margin: 0 0 16px;
  color: var(--text-dim);
}
.post-body hr { border: none; border-top: 1px solid var(--grid-line); margin: 32px 0; }
.post-body img { max-width: 100%; border-radius: 4px; border: 1px solid var(--grid-line); }
.post-body table { border-collapse: collapse; margin: 0 0 16px; font-size: 15px; }
.post-body th, .post-body td { border: 1px solid var(--grid-line); padding: 6px 12px; text-align: left; }
.post-body th { font-family: var(--mono); font-size: 13px; color: var(--text-dim); }

.back-link { font-family: var(--mono); font-size: 14px; }

/* ---------- footer ---------- */
footer {
  border-top: 1px solid var(--grid-line);
  padding: 24px 0 40px;
  font-family: var(--mono); font-size: 13px;
  color: var(--text-dim);
}
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

@media (max-width: 520px) {
  .hero { padding-top: 48px; }
  .waterfall canvas { height: 140px; }
  header { flex-wrap: wrap; gap: 8px; }
}