/* ===========================================================
   Field Notes — stylesheet
   Concept: a field logbook. Literary serif for reading,
   instrument-panel mono for metadata, cool paper, one signal accent.
   =========================================================== */

:root {
  --paper:      #F7F8F6;
  --paper-deep: #EEF0EC;
  --ink:        #1A1D1A;
  --muted:      #6B6F6A;
  --hairline:   #DBDDD7;
  --signal:     #E8552D;

  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --mono:  "Space Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --measure: 38rem;     /* reading width */
  --gutter:  1.5rem;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.18rem;
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

/* ---- layout shell ---- */
.wrap {
  width: 100%;
  max-width: 60rem;
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.measure { max-width: var(--measure); }

/* ---- site header ---- */
.masthead {
  border-bottom: 1px solid var(--hairline);
}
.masthead .wrap {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
}
.brand {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
}
.brand:hover { color: var(--signal); }
.brand .mark { color: var(--signal); }

.nav {
  display: flex;
  gap: 1.5rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.nav a {
  color: var(--muted);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}
.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--signal);
}

/* ---- banner image slot ---- */
.banner {
  position: relative;
  height: clamp(220px, 42vh, 460px);
  background: var(--paper-deep);
  background-size: cover;
  background-position: center;
  border-bottom: 1px solid var(--hairline);
  overflow: hidden;
}
.banner::after {            /* horizon rule — the signature motif */
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 4px;
  background: var(--signal);
}
.banner-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: center;
  padding: 1rem;
}

/* ---- home hero ---- */
.hero { padding: 4rem 0 3rem; }
.hero h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2.4rem, 6vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
}
.hero p {
  font-size: 1.3rem;
  color: var(--muted);
  margin: 0;
  max-width: 34rem;
}

/* ---- instrument readout (metadata line) ---- */
.readout {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.9rem;
}
.readout .dot { color: var(--hairline); }

/* ---- post list ---- */
.post-list { padding: 2.5rem 0 4rem; }
.post-item {
  padding: 2rem 0;
  border-top: 1px solid var(--hairline);
}
.post-item:last-child { border-bottom: 1px solid var(--hairline); }
.post-item h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.8rem;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0.6rem 0 0.5rem;
}
.post-item h2 a { color: var(--ink); text-decoration: none; }
.post-item h2 a:hover { color: var(--signal); }
.post-item .excerpt { color: var(--muted); margin: 0; }

/* ---- single post ---- */
.post-head {
  padding: 3.5rem 0 2rem;
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 2.5rem;
}
.post-head h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0.8rem 0 0;
}
.post-body { padding-bottom: 4rem; }
.post-body h2 { font-weight: 600; font-size: 1.6rem; margin: 2.5rem 0 0.5rem; letter-spacing: -0.01em; }
.post-body h3 { font-weight: 600; font-size: 1.3rem; margin: 2rem 0 0.5rem; }
.post-body p { margin: 0 0 1.4rem; }
.post-body a { color: var(--ink); text-decoration: underline; text-decoration-color: var(--signal); text-underline-offset: 3px; }
.post-body a:hover { color: var(--signal); }
.post-body img {
  display: block;
  width: 100%;
  height: auto;
  margin: 2rem 0 0.5rem;
  border: 1px solid var(--hairline);
}
.post-body img + em {     /* image caption: ![caption](src) renders the alt; use *italic* line under */
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 2rem;
}
.post-body blockquote {
  margin: 2rem 0;
  padding-left: 1.2rem;
  border-left: 3px solid var(--signal);
  color: var(--muted);
  font-style: italic;
}
.post-body code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--paper-deep);
  padding: 0.1em 0.35em;
  border-radius: 2px;
}
.post-body pre {
  font-family: var(--mono);
  font-size: 0.82rem;
  background: var(--ink);
  color: var(--paper);
  padding: 1.2rem;
  overflow-x: auto;
  line-height: 1.5;
}
.post-body pre code { background: none; padding: 0; }
.post-body hr { border: none; border-top: 1px solid var(--hairline); margin: 3rem 0; }

/* ---- generic page (about) ---- */
.page-head { padding: 3.5rem 0 1rem; }
.page-head h1 {
  font-weight: 500;
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: -0.02em;
  margin: 0;
}
.page-body { padding: 1rem 0 4rem; }
.page-body p { margin: 0 0 1.4rem; }
.page-body a { color: var(--ink); text-decoration: underline; text-decoration-color: var(--signal); text-underline-offset: 3px; }

/* ---- back link ---- */
.back {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  display: inline-block;
  margin-top: 2rem;
}
.back:hover { color: var(--signal); }

/* ---- footer ---- */
.site-foot {
  border-top: 1px solid var(--hairline);
  padding: 2rem 0;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.site-foot a { color: var(--muted); text-decoration: none; }
.site-foot a:hover { color: var(--signal); }

/* ---- accessibility / motion ---- */
a:focus-visible,
.brand:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ---- small screens ---- */
@media (max-width: 600px) {
  body { font-size: 1.08rem; }
  .hero { padding: 2.5rem 0 2rem; }
  .masthead .wrap { flex-direction: column; align-items: flex-start; }
}