/* ---------------------------------------------------------------------------
   advnirr.org — minimalist portfolio
   System-font, single accent, light/dark via prefers-color-scheme.
--------------------------------------------------------------------------- */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&family=Inter:wght@400;500;600&display=swap');

:root {
  --bg:        #0d0e12;
  --bg-soft:   #15171d;
  --border:    #23262f;
  --text:      #e6e7ea;
  --muted:     #8b8f9a;
  --accent:    #7aa2f7;
  --accent-dim:#5b7cc4;

  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --maxw: 720px;
  --radius: 10px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg:        #fbfbfa;
    --bg-soft:   #ffffff;
    --border:    #e6e6e3;
    --text:      #16181d;
    --muted:     #696e78;
    --accent:    #3b5bdb;
    --accent-dim:#5a72d6;
  }
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  margin: 0;
  background: transparent;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

/* --- living background ---------------------------------------------------- */

.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

/* slow-drifting aurora glow in the accent hue */
.bg-aurora {
  position: absolute;
  inset: -25%;
  background:
    radial-gradient(38% 42% at 20% 28%, color-mix(in srgb, var(--accent) 26%, transparent) 0%, transparent 60%),
    radial-gradient(34% 40% at 82% 22%, color-mix(in srgb, var(--accent-dim) 22%, transparent) 0%, transparent 62%),
    radial-gradient(46% 50% at 60% 92%, color-mix(in srgb, var(--accent) 18%, transparent) 0%, transparent 66%);
  filter: blur(60px) saturate(115%);
  opacity: 0.55;
  animation: drift 26s ease-in-out infinite alternate;
}

@keyframes drift {
  0%   { transform: translate3d(-3%, -2%, 0) scale(1);    }
  50%  { transform: translate3d(2%, 1%, 0)   scale(1.08); }
  100% { transform: translate3d(4%, 3%, 0)   scale(1.02); }
}

/* faint grid, fading out from the top so it never dominates */
.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right,  var(--border) 1px, transparent 1px),
    linear-gradient(to bottom, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.25;
  -webkit-mask-image: radial-gradient(120% 80% at 50% 0%, #000 30%, transparent 78%);
          mask-image: radial-gradient(120% 80% at 50% 0%, #000 30%, transparent 78%);
}

@media (prefers-reduced-motion: reduce) {
  .bg-aurora { animation: none; }
}

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

main,
.site-footer {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

main { padding-block: 2rem 4rem; }

section { padding-block: 2.5rem; }
section + section { border-top: 1px solid var(--border); }

/* --- header --------------------------------------------------------------- */

.site-header {
  padding-block: 1.5rem;
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(10px);
  z-index: 10;
  border-bottom: 1px solid var(--border);
}

/* Bar spans the full viewport; its nav stays aligned to the content column. */
.site-header nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 1.4rem;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 1.5rem;
}
.site-header nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
}
.site-header nav a:hover { color: var(--text); }

/* --- intro ---------------------------------------------------------------- */

.intro { padding-top: 3.5rem; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.75rem;
}

h1 {
  font-size: clamp(2.6rem, 8vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 1.2rem;
  font-weight: 600;
}

.cursor {
  color: var(--accent);
  font-weight: 400;
  animation: blink 1.1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.lede {
  font-size: 1.12rem;
  color: var(--text);
  max-width: 52ch;
  margin: 0 0 1.6rem;
}

/* --- headings ------------------------------------------------------------- */

h2 {
  font-size: 1.05rem;
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.01em;
  margin: 0 0 0.3rem;
}
h2::before { content: '# '; color: var(--accent); }

.section-note {
  color: var(--muted);
  margin: 0 0 1.8rem;
  font-size: 0.95rem;
}

/* --- entries -------------------------------------------------------------- */

.entries { list-style: none; margin: 0; padding: 0; display: grid; gap: 1rem; }

.entries.grid {
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

.entry {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
  transition: border-color 0.18s ease, transform 0.18s ease;
}
.entry:hover {
  border-color: var(--accent-dim);
  transform: translateY(-2px);
}

.entry-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.5rem;
}

.entry-org {
  font-weight: 600;
  font-size: 0.85rem;
}

.entry-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 0.1rem 0.55rem;
}

.entry h3 {
  margin: 0 0 0.4rem;
  font-size: 1.08rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.entry h3 a { color: var(--text); }
.entry h3 a:hover { color: var(--accent); }

.entry p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.55;
}

.entry code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--text);
  padding: 0.08em 0.35em;
  border-radius: 4px;
}

.more { margin: 1.6rem 0 0; font-family: var(--font-mono); font-size: 0.9rem; }

/* --- links ---------------------------------------------------------------- */

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

.links { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.5rem; }
.links.inline { display: flex; gap: 1.2rem; }
.links a { font-family: var(--font-mono); font-size: 0.95rem; }

/* --- footer --------------------------------------------------------------- */

.site-footer {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-block: 2rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}
.muted { color: var(--muted); }

/* --- a11y ----------------------------------------------------------------- */

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: 0 0 8px 0;
  z-index: 100;
}
.skip-link:focus { left: 0; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

/* --- responsive ----------------------------------------------------------- */

@media (max-width: 540px) {
  .site-header nav { gap: 1rem; }
  .site-header nav a:first-child { display: none; } /* keep header tidy on phones */
  body { font-size: 16px; }
}

/* Tablet / small desktop: give the column room to grow. */
@media (min-width: 768px) {
  :root { --maxw: 880px; }

  main { padding-block: 3rem 6rem; }
  section { padding-block: 4rem; }
  .intro { padding-top: 5rem; }
}

/* Desktop: switch to a two-column layout that actually uses the width —
   section heading sits in a left rail, content fills the right. */
@media (min-width: 1024px) {
  :root { --maxw: 1120px; }

  body { font-size: 18px; }

  /* Hero gets more presence at desktop scale. */
  h1 { font-size: clamp(3.4rem, 5.5vw, 4.6rem); }
  .intro .lede { font-size: 1.22rem; max-width: 30ch; }

  /* Label-rail layout for content sections (not the hero). */
  main > section:not(.intro) {
    display: grid;
    grid-template-columns: minmax(160px, 220px) minmax(0, 1fr);
    column-gap: 3.5rem;
    row-gap: 0;
    align-items: start;
  }

  main > section:not(.intro) > h2,
  main > section:not(.intro) > .section-note {
    grid-column: 1;
  }

  main > section:not(.intro) > *:not(h2):not(.section-note) {
    grid-column: 2;
  }

  /* Two work cards sit side by side instead of stacking full-width. */
  #work .entries { grid-template-columns: 1fr 1fr; gap: 1.25rem; }
}

/* Large desktop: cap line length, add a little more air. */
@media (min-width: 1440px) {
  :root { --maxw: 1200px; }
  section { padding-block: 5rem; }
}