/* =========================================================================
   roboav8r.github.io — "engineering notebook" identity
   Tokens first, then base, then components. Edit tokens to retune the whole site.
   ========================================================================= */

:root {
  /* Palette — cool paper + terminal-ink panels + one burnt-orange signal */
  --bg:        #f7f9fb;
  --bg-tint:   #eef2f5;
  --panel:     #0e1419;   /* terminal-dark blocks (code, footer)        */
  --ink:       #14181d;   /* primary text                               */
  --muted:     #59636e;   /* secondary text, labels                     */
  --hair:      #e1e7ec;   /* hairlines, borders                         */
  --accent:    #b85400;   /* UT burnt orange — links, signal            */
  --accent-br: #f2843c;   /* lighter burnt orange for dark panels       */

  /* Type */
  --sans: "IBM Plex Sans", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  /* Scale */
  --measure: 68ch;
  --gap: clamp(1.25rem, 4vw, 2.5rem);
}

/* --- Reset-ish ----------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 { line-height: 1.12; font-weight: 600; letter-spacing: -0.01em; }
h1 { font-size: clamp(1.9rem, 1.3rem + 2.6vw, 3rem); }
h2 { font-size: clamp(1.4rem, 1.1rem + 1.4vw, 1.95rem); }
h3 { font-size: 1.15rem; }
p  { max-width: var(--measure); }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

hr { border: 0; border-top: 1px solid var(--hair); margin: var(--gap) 0; }

/* --- Layout -------------------------------------------------------------- */
.wrap { width: min(72rem, 100% - 2.5rem); margin-inline: auto; }
.section { padding-block: clamp(2.5rem, 6vw, 4.5rem); }
main { min-height: 60vh; }

/* --- Utility ------------------------------------------------------------- */
.mono { font-family: var(--mono); }
.muted { color: var(--muted); }
.eyebrow {
  font-size: 0.78rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 0.9rem;
}
.lede { font-size: 1.15rem; color: var(--ink); max-width: 60ch; }

.skip-link {
  position: absolute; left: -999px; top: 0; background: var(--ink); color: #fff;
  padding: 0.6rem 1rem; z-index: 10;
}
.skip-link:focus { left: 0.75rem; top: 0.75rem; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }

/* --- Header -------------------------------------------------------------- */
.site-header {
  border-bottom: 1px solid var(--hair);
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.1) blur(6px);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-block: 0.85rem; }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; color: var(--ink); font-weight: 600; }
.brand:hover { text-decoration: none; }
.brand-mark { color: var(--accent); display: inline-flex; }
.brand-name { letter-spacing: -0.01em; }
.site-nav { display: flex; gap: clamp(0.8rem, 2.5vw, 1.6rem); flex-wrap: wrap; }
.site-nav a { color: var(--muted); font-size: 0.95rem; }
.site-nav a:hover { color: var(--ink); text-decoration: none; }

/* --- Hero ---------------------------------------------------------------- */
.hero { padding-block: clamp(3rem, 8vw, 6rem) clamp(1.5rem, 4vw, 3rem); }
.hero-title { margin: 0 0 1.4rem; max-width: 22ch; }
.hero-lede { font-size: 1.18rem; max-width: 58ch; color: #2b333c; }
.hero-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 1.8rem; }

.btn {
  display: inline-block; font-family: var(--mono); font-size: 0.9rem;
  padding: 0.6rem 1.1rem; border: 1px solid var(--ink); color: #fff; background: var(--ink);
  border-radius: 2px;
}
.btn:hover { background: #000; text-decoration: none; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--hair); }
.btn-ghost:hover { background: var(--bg-tint); border-color: var(--muted); }

/* --- Factor-graph divider (the signature) -------------------------------- */
/* A hairline carrying nodes — a nod to PRISM's factor graph. Nodes are drawn
   as radial gradients on the bar itself, so they stay put at any width. */
.fg-divider {
  height: 9px; border: 0; margin: 0; background:
    /* the hairline */
    linear-gradient(var(--hair), var(--hair)) 0 50% / 100% 1px no-repeat,
    /* three nodes: hollow burnt-orange dots */
    radial-gradient(circle 3.5px, var(--accent) 0 1.4px, var(--bg) 1.5px 3px, transparent 3.1px) 18% 50% / 12px 9px no-repeat,
    radial-gradient(circle 3.5px, var(--accent) 0 1.4px, var(--bg) 1.5px 3px, transparent 3.1px) 50% 50% / 12px 9px no-repeat,
    radial-gradient(circle 3.5px, var(--accent) 0 1.4px, var(--bg) 1.5px 3px, transparent 3.1px) 82% 50% / 12px 9px no-repeat;
}

/* --- "Currently" grid ---------------------------------------------------- */
.now-grid { display: grid; gap: var(--gap); grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); }
.now-item h3 { margin: 0 0 0.4rem; }
.now-item p { color: var(--muted); margin: 0; }
.now-item { border-top: 2px solid var(--ink); padding-top: 0.9rem; }

/* --- Log list ------------------------------------------------------------ */
.log-list { list-style: none; margin: 0; padding: 0; }
.log-row { border-top: 1px solid var(--hair); }
.log-row:last-child { border-bottom: 1px solid var(--hair); }
.log-row a {
  display: grid; grid-template-columns: 7.5rem 1fr; gap: 1rem; align-items: baseline;
  padding: 1rem 0; color: var(--ink);
}
.log-row a:hover { text-decoration: none; background: var(--bg-tint); }
.log-list--full .log-row a { grid-template-columns: 7.5rem 1fr; }
.log-date { color: var(--accent); font-size: 0.9rem; }
.log-title { font-weight: 600; }
.log-summary { grid-column: 2; color: var(--muted); font-size: 0.95rem; display: block; margin-top: 0.2rem; }

/* --- Page heads ---------------------------------------------------------- */
.page-head h1 { margin: 0 0 0.6rem; }
.page-head .lede { color: var(--muted); }

/* --- Projects ------------------------------------------------------------ */
.project { border-top: 1px solid var(--hair); padding-block: clamp(2rem, 5vw, 3.2rem); }
.project-grid { display: grid; grid-template-columns: 14rem 1fr; gap: var(--gap); }
.project-meta { display: flex; flex-direction: column; gap: 0.35rem; color: var(--muted); font-size: 0.85rem; }
.project-meta .tag {
  align-self: start; color: var(--accent); border: 1px solid var(--accent);
  padding: 0.1rem 0.5rem; border-radius: 2px; font-size: 0.72rem; letter-spacing: 0.1em;
  text-transform: uppercase; margin-bottom: 0.3rem;
}
.project-meta .status { color: var(--ink); }
.project-body h2 { margin: 0 0 0.6rem; }
.project-links { margin-top: 0.8rem; display: flex; gap: 1.2rem; flex-wrap: wrap; font-size: 0.9rem; }

/* --- Resume -------------------------------------------------------------- */
.resume-block { border-top: 1px solid var(--hair); padding-block: 1.8rem; }
.resume-row { display: flex; justify-content: space-between; gap: 1rem; align-items: baseline; flex-wrap: wrap; }
.resume-role h3 { margin: 0; }
.resume-role .org { margin: 0.15rem 0 0; color: var(--muted); }
.resume-when { color: var(--muted); font-size: 0.9rem; white-space: nowrap; }
.resume-block > p { color: var(--muted); margin-top: 0.7rem; }
.skill-cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr)); gap: var(--gap); font-size: 0.9rem; }
.skill-cols h4 { margin: 0 0 0.5rem; color: var(--ink); font-family: var(--sans); }
.skill-cols ul { list-style: none; margin: 0; padding: 0; color: var(--muted); }
.skill-cols li { padding: 0.15rem 0; }

/* --- Post / prose -------------------------------------------------------- */
.post { padding-block: clamp(2.5rem, 6vw, 4rem); }
.post-head { border-bottom: 1px solid var(--hair); padding-bottom: 1.4rem; margin-bottom: 1.8rem; }
.post-head h1 { margin: 0.3rem 0 0.6rem; }
.tags span { color: var(--muted); margin-right: 0.8rem; font-size: 0.85rem; }
.tags span::before { content: "#"; color: var(--accent); }
.prose { max-width: var(--measure); }
.prose h2 { margin: 2rem 0 0.6rem; }
.prose h3 { margin: 1.6rem 0 0.4rem; }
.prose ul, .prose ol { padding-left: 1.2rem; }
.prose li { margin: 0.3rem 0; }
.prose code {
  font-family: var(--mono); font-size: 0.88em; background: var(--bg-tint);
  padding: 0.1rem 0.35rem; border-radius: 3px;
}
.prose pre {
  background: var(--panel); color: #e8edf2; padding: 1rem 1.1rem; border-radius: 4px;
  overflow-x: auto; font-family: var(--mono); font-size: 0.85rem; line-height: 1.55;
}
.prose pre code { background: none; padding: 0; color: inherit; }
.prose blockquote {
  margin: 1.2rem 0; padding-left: 1rem; border-left: 2px solid var(--accent); color: var(--muted);
}
.post-nav { margin-top: 2.5rem; padding-top: 1.2rem; border-top: 1px solid var(--hair); }
.empty { color: var(--muted); }

/* --- Footer -------------------------------------------------------------- */
.site-footer { background: var(--panel); color: #aeb8c2; margin-top: 3rem; }
.footer-inner { display: flex; justify-content: space-between; gap: 1rem; padding-block: 1.5rem; flex-wrap: wrap; font-size: 0.85rem; }
.site-footer a { color: var(--accent-br); }

/* --- Responsive ---------------------------------------------------------- */
@media (max-width: 640px) {
  .project-grid { grid-template-columns: 1fr; }
  .project-meta { flex-flow: row wrap; gap: 0.5rem 1rem; }
  .log-row a { grid-template-columns: 6rem 1fr; }
  .hero-title { max-width: none; }
}

/* --- Motion ------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}