:root {
  --bg: #f7f8fa;        /* cool soft white */
  --surface: #ffffff;
  --ink: #14161c;
  --muted: #626875;
  --line: #e1e4ea;
  --soft: #eaedf3;
  --tint: #eef1f6;
  --accent: #3a44b8;    /* indigo ink */
  --serif: "Instrument Serif", Georgia, serif;
  --mono: "Courier Prime", "Courier New", Courier, monospace;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16.5px/1.65 "Inter", system-ui, sans-serif; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--accent); }

h1 { font: 400 54px/1 var(--serif); letter-spacing: -0.01em; margin: 22px 0 12px; }
/* Section headings: small capitals, numbered in binary */
h2 { font: 600 15px/1.4 "IBM Plex Sans", system-ui, sans-serif; text-transform: uppercase; letter-spacing: 0.1em; margin: 0 0 18px; }
h2::before { font: 400 15px/1.4 var(--mono); color: var(--accent); opacity: 0.8; margin-right: 12px; letter-spacing: 0.04em; }
#projects h2::before { content: "00"; }
#writing h2::before { content: "01"; }
#about h2::before { content: "10"; }
#contact h2::before { content: "11"; }
h3 { font: 700 17.5px/1.35 var(--mono); margin: 0; }

/* Layout: floating menu on top, you fixed on the left, content scrolling on the right */
.wrap {
  max-width: 1120px; margin: 0 auto; padding: 96px 24px 96px;
  display: grid; grid-template-columns: 290px minmax(0, 1fr); gap: 0 72px;
}

/* Menu: always visible. Clear at the top, a floating pill after scrolling. */
.nav {
  position: fixed; top: 16px; right: max(24px, calc(50vw - 536px)); z-index: 20;
  display: flex; gap: 2px; padding: 5px; border-radius: 999px;
  border: 1px solid transparent; background: rgba(255, 255, 255, 0);
  transition: background 0.6s ease, border-color 0.6s ease, box-shadow 0.6s ease, transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.nav a {
  padding: 6px 13px 4px; border-radius: 999px; font: 400 14px/1.5 var(--mono); text-decoration: none;
  color: var(--ink); opacity: 0.5; transition: opacity 0.4s ease, background 0.4s ease, color 0.4s ease;
}
.nav a:hover { opacity: 1; }
.nav a.active { opacity: 1; background: var(--soft); color: var(--accent); }
.nav.scrolled {
  background: rgba(255, 255, 255, 0.78); border-color: var(--line);
  box-shadow: 0 8px 28px rgba(20, 22, 28, 0.08);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  animation: drift 7s ease-in-out infinite;
}
@keyframes drift { 0%, 100% { transform: translateY(3px); } 50% { transform: translateY(7px); } }

/* Left side: fixed, never moves */
header { position: fixed; top: 96px; left: max(24px, calc(50vw - 536px)); width: 290px; z-index: 5; }
.portrait { display: block; width: 100%; height: auto; aspect-ratio: 1; border-radius: 6px; object-fit: cover; }
.lede { font-size: 15.5px; line-height: 1.6; color: var(--muted); margin: 0; }

/* The butterfly: a Lorenz attractor that draws itself once. Hover to redraw. */
.quirk { display: flex; align-items: center; gap: 12px; margin: 24px 0 0; padding: 0; border: 0; background: none; color: inherit; cursor: pointer; text-align: left; }
.quirk svg { flex: none; width: 88px; opacity: 0.42; transition: opacity 0.3s ease; }
.quirk.show svg, .quirk:focus-visible svg { opacity: 0.7; }
.quirk path { stroke: var(--ink); stroke-width: 1.2; stroke-linecap: round; stroke-linejoin: round; }
.quirk-label { font: 400 12.5px/1.4 var(--mono); color: var(--muted); opacity: 0; transform: translateX(-4px); transition: opacity 0.3s ease, transform 0.3s ease; }
.quirk.show .quirk-label, .quirk:focus-visible .quirk-label { opacity: 1; transform: none; }
/* Touch screens (iPhone and iPad) get no caption at all. */
@media (hover: none), (pointer: coarse) { .quirk-label { display: none; } }
/* Hover only on devices that really hover. Touch screens keep a tapped element "hovered" until you tap elsewhere. */
@media (hover: hover) and (pointer: fine) {
  .quirk:hover svg { opacity: 0.7; }
  .quirk:hover .quirk-label { opacity: 1; transform: none; }
}

section { grid-column: 2; margin-top: 68px; scroll-margin-top: 96px; }
#projects { margin-top: 0; }

/* Project tiles */
.tiles { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.tile {
  position: relative; display: flex; flex-direction: column; align-items: flex-start; gap: 8px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 10px;
  padding: 18px 20px 20px; color: inherit; text-decoration: none;
}
.tile p { margin: 0; color: var(--muted); font-size: 14.5px; line-height: 1.55; }
.tag, .date { font: 400 13px/1.5 var(--mono); color: var(--muted); }
.tag { padding: 2px 9px 0; border-radius: 999px; font-size: 12.5px; color: color-mix(in srgb, var(--accent) 55%, var(--muted)); border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--line)); background: color-mix(in srgb, var(--accent) 4%, var(--surface)); }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.arrow { color: var(--muted); font-size: 16px; transition: transform 0.2s ease, color 0.2s ease; }
.tile .arrow { position: absolute; top: 15px; right: 16px; }

/* Quiet hover: the border firms up and the arrow nudges. Nothing jumps. */
.tile.link { padding-right: 44px; transition: border-color 0.2s ease; }
.tile.link:hover, .tile.link:focus-visible { border-color: color-mix(in srgb, var(--ink) 38%, var(--line)); }
.tile.link:hover .arrow, .post:hover .arrow { transform: translate(2px, -2px); color: var(--accent); }

/* Writing: a horizontal list on a tinted panel */
.posts { background: var(--tint); border-radius: 12px; overflow: hidden; }
.post {
  display: grid; grid-template-columns: 84px minmax(0, 1fr) 18px; gap: 18px; align-items: baseline;
  padding: 18px 20px; color: inherit; text-decoration: none; transition: background 0.2s ease;
}
.post + .post { border-top: 1px solid color-mix(in srgb, var(--ink) 8%, transparent); }
.post:hover, .post:focus-visible { background: color-mix(in srgb, var(--ink) 4%, var(--tint)); }
.post-title { display: block; font: 400 23px/1.2 var(--serif); letter-spacing: -0.005em; }
.post-sub { display: block; margin-top: 4px; color: var(--muted); font-size: 14.5px; line-height: 1.5; }
.more { margin: 14px 0 0; font: 400 14.5px/1.5 var(--mono); }

/* About: italic serif labels in indigo so the blocks of text have clear entry points */
.about { display: grid; grid-template-columns: 130px 1fr; gap: 16px 20px; margin: 0; }
.about dt { font: italic 400 20px/1.35 var(--serif); color: #474b82; }
.about dd { margin: 0; }

/* Contact */
.contact-note { margin: 0 0 14px; max-width: 34em; }
.copied { color: var(--accent); margin-left: 10px; }
.links { display: flex; flex-wrap: wrap; gap: 8px 22px; font: 400 14.5px/1.5 var(--mono); margin: 0; padding: 0; list-style: none; }

/* Short windows: shrink the photo so the fixed left side always fits */
@media (min-width: 901px) and (max-height: 740px) { .portrait { width: 220px; } h1 { font-size: 46px; margin-top: 16px; } }
@media (min-width: 901px) and (max-height: 600px) { .portrait { width: 150px; } .quirk { margin-top: 14px; } }
@media (max-width: 900px) { .quirk-label { max-width: 200px; } }

@media (max-width: 900px) {
  .wrap { display: block; padding: 84px 16px 72px; }
  .nav { right: 16px; }
  header { position: static; width: auto; }
  .portrait { width: 170px; }
  h1 { font-size: 48px; }
  .lede { font-size: 16.5px; color: var(--ink); }
  #projects { margin-top: 48px; }
  section { margin-top: 56px; }
}
@media (max-width: 600px) {
  .nav { left: 0; right: 0; width: max-content; margin: 0 auto; }
  .nav a { padding: 6px 10px 4px; }
  .tiles { grid-template-columns: 1fr; }
  .post { grid-template-columns: minmax(0, 1fr) 18px; gap: 4px 12px; }
  .post .date { grid-column: 1 / -1; }
  .about { grid-template-columns: 1fr; gap: 4px; }
  .about dt { font-size: 22px; }
  .about dd { margin-bottom: 22px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .nav.scrolled { animation: none; transform: translateY(4px); }
}