/* ============================================================
   Portfolio scaffold — shared styles
   Aesthetic: "lab readout". Monospace carries structural
   metadata (node IDs, types, edges); system sans carries prose.
   Self-contained: system fonts only, no external requests.
   ============================================================ */

:root {
  --paper:   #f6f6f2;
  --panel:   #fcfcfa;
  --ink:     #191b1f;
  --muted:   #6a6e76;
  --faint:   #9b9ea4;
  --line:    #e4e3dc;
  --line-2:  #d6d6cd;
  --accent:  #1c6b66;   /* navigation / content edges */
  --accent-d:#14524e;
  --dep:     #b4531f;   /* analytical-dependency edges only */
  --dep-bg:  #f7ece3;

  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --maxw: 880px;
  --gap:  clamp(1.5rem, 4vw, 3rem);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ---- structural metadata type ---- */
.mono {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ---- site header / global nav (the navigation layer) ---- */
.site-head {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1.25rem;
  padding: 0.85rem var(--gap);
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.brand {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-decoration: none;
  margin-right: auto;
}
.brand b { color: var(--accent-d); }
.nav-layer {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
}
.nav-layer a {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  padding: 2px 0;
  border-bottom: 1px solid transparent;
  transition: color .15s ease, border-color .15s ease;
}
.nav-layer a:hover,
.nav-layer a[aria-current="page"] {
  color: var(--accent-d);
  border-color: var(--accent);
}

/* ---- page shell ---- */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(1.5rem, 5vw, 3.25rem) var(--gap) 4rem;
}

/* ---- nodebar: the self-documenting signature ---- */
.nodebar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.9rem;
  padding: 0.55rem 0.8rem;
  margin-bottom: 2.5rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}
.nodebar .id   { color: var(--ink); font-weight: 600; }
.nodebar .type { color: var(--accent-d); }
.nodebar .sep  { color: var(--line-2); }
.nodebar .out  { margin-left: auto; color: var(--faint); }
.nodebar .out b { color: var(--ink); font-weight: 600; }

/* ---- typography ---- */
.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-d);
  margin: 0 0 0.6rem;
}
h1 {
  font-size: clamp(1.9rem, 5vw, 2.9rem);
  line-height: 1.08;
  letter-spacing: -0.022em;
  font-weight: 680;
  margin: 0 0 0.9rem;
}
h2 {
  font-size: 1.3rem;
  letter-spacing: -0.012em;
  font-weight: 660;
  margin: 2.6rem 0 0.6rem;
}
h3 { font-size: 1.02rem; font-weight: 640; margin: 1.6rem 0 0.4rem; }
p { margin: 0 0 1rem; }
.lede { font-size: 1.18rem; color: #2c2f35; max-width: 60ch; }
.muted { color: var(--muted); }
a { color: var(--accent-d); }

/* placeholder helper text — marks what the user fills in */
.fill {
  display: block;
  color: var(--faint);
  font-style: italic;
  font-size: 0.95rem;
}
.placeholder {
  border: 1px dashed var(--line-2);
  border-radius: 3px;
  background: repeating-linear-gradient(
    -45deg, transparent, transparent 9px,
    rgba(0,0,0,0.012) 9px, rgba(0,0,0,0.012) 18px);
  padding: 1rem 1.1rem;
  margin: 0.5rem 0 1.25rem;
}

/* ---- the two-track split (home) ---- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin: 2.5rem 0;
  background: var(--line);
  border: 1px solid var(--line);
}
.track {
  background: var(--panel);
  padding: 1.4rem 1.4rem 1.5rem;
}
.track h3 { margin-top: 0; }
.track .mono { color: var(--accent-d); display: block; margin-bottom: 0.4rem; }
.track.applied .mono { color: var(--dep); }

/* ---- card grids (hubs) ---- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1px;
  margin: 1.5rem 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}
.card {
  background: var(--panel);
  padding: 1.1rem 1.2rem 1.3rem;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: background .15s ease;
}
.card:hover { background: #fff; }
.card .id { font-family: var(--mono); font-size: 0.7rem; color: var(--faint); letter-spacing: 0.08em; }
.card .ttl { font-weight: 640; font-size: 1.02rem; letter-spacing: -0.01em; }
.card .desc { font-size: 0.9rem; color: var(--muted); }
.tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 1px 6px;
  border: 1px solid var(--line-2);
  border-radius: 2px;
  color: var(--muted);
  width: max-content;
}
.tag.inv { color: var(--accent-d); border-color: color-mix(in srgb, var(--accent) 40%, var(--line-2)); }
.tag.app { color: var(--dep); border-color: color-mix(in srgb, var(--dep) 35%, var(--line-2)); }

/* ---- writeup skeleton (flagship) ---- */
.skeleton { margin-top: 1rem; counter-reset: step; }
.skeleton section {
  padding: 1.1rem 0 1.2rem 0;
  border-top: 1px solid var(--line);
}
.skeleton section h2 {
  margin: 0 0 0.4rem;
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
}
.skeleton section h2::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent-d);
  letter-spacing: 0.08em;
}

/* ---- connections footer (the content-edge layer) ---- */
.edges {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.6rem var(--gap) 3rem;
  border-top: 1px solid var(--line);
}
.edges h4 {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.8rem;
}
.edgelist { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.35rem; }
.edgelist li { display: flex; align-items: baseline; gap: 0.6rem; font-size: 0.92rem; }
.edgelist .arrow { font-family: var(--mono); color: var(--accent); font-size: 0.85rem; }
.edgelist a { text-decoration: none; border-bottom: 1px solid var(--line-2); }
.edgelist a:hover { border-color: var(--accent); }
.edgelist .kind {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--faint);
  margin-left: auto;
}
/* dependency edges read in the second structural color */
.edgelist li.dep .arrow { color: var(--dep); }
.edgelist li.dep .kind  { color: var(--dep); }
.edgelist li.dep a      { border-color: color-mix(in srgb, var(--dep) 30%, var(--line-2)); }

.nonedge {
  margin-top: 1rem;
  padding: 0.7rem 0.9rem;
  background: var(--dep-bg);
  border-left: 3px solid var(--dep);
  font-size: 0.85rem;
  color: #6b3a23;
}
.nonedge .mono { color: var(--dep); }

/* ---- adjacency strip (home signature) ---- */
.graph-strip {
  margin: 2.5rem 0 0;
  padding: 1.1rem 1.2rem;
  background: var(--panel);
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.9;
  color: var(--muted);
  overflow-x: auto;
}
.graph-strip .n { color: var(--ink); }
.graph-strip .d { color: var(--dep); }

/* ---- site footer ---- */
.site-foot {
  border-top: 1px solid var(--line);
  padding: 1.4rem var(--gap);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--faint);
}

.btn {
  display: inline-block;
  margin-top: 0.5rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--paper);
  background: var(--accent-d);
  padding: 0.55rem 1rem;
  border-radius: 3px;
  transition: background .15s ease;
}
.btn:hover { background: var(--accent); }

/* ---- quality floor ---- */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

@media (max-width: 620px) {
  .split { grid-template-columns: 1fr; }
  .nodebar .out { margin-left: 0; width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}