styles.css

/* Jeewon Kim — personal site
   Plain HTML/CSS/JS. Colors are tokens; change them here. */
:root {
  --paper: #f4f6f3;
  --ink: #17201d;
  --muted: #5b6863;
  --line: #d3d9d3;
  --accent: #2f4fcf;
  --accent-soft: rgba(47, 79, 207, .12);
  --surface: #ffffff;
  --font: "Schibsted Grotesk", -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Segoe UI", system-ui, sans-serif;
  --rail: 168px;
  --measure: 66ch;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #111614; --ink: #e6ebe8; --muted: #98a49f; --line: #2c3531;
    --accent: #9fb2ff; --accent-soft: rgba(159, 178, 255, .16); --surface: #1b221f;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #111614; --ink: #e6ebe8; --muted: #98a49f; --line: #2c3531;
  --accent: #9fb2ff; --accent-soft: rgba(159, 178, 255, .16); --surface: #1b221f;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.6 var(--font);
  font-feature-settings: "tnum" 0;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, p, ul, dl { margin: 0; }

a { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--paper); padding: 8px 12px; }
.skip:focus { left: 16px; }

.shell { width: min(1080px, 100% - 32px); margin-inline: auto; }

/* ── Hero ── */
.hero { padding: clamp(48px, 9vw, 112px) 0 24px; }
h1 {
  font-size: clamp(64px, 14vw, 168px);
  font-weight: 800;
  line-height: .86;
  letter-spacing: -0.05em;
  margin-left: -0.04em;
}
.intro {
  margin-top: clamp(24px, 4vw, 40px);
  max-width: 38ch;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.42;
  letter-spacing: -0.01em;
}
.links { display: flex; flex-wrap: wrap; gap: 8px 24px; margin-top: 24px; font-weight: 600; }

/* ── Career trace ── */
.trace { margin-top: clamp(48px, 7vw, 80px); margin-bottom: 0; }
.trace-track {
  list-style: none; margin: 0; padding: 0;
  position: relative;
  height: 168px;
}
/* the axis, with a break for 2022–2023 */
.trace-track::before {
  content: "";
  position: absolute; left: 0; right: 0; top: 50%;
  height: 2px; margin-top: -1px;
  background: linear-gradient(to right,
    var(--ink) 0, var(--ink) var(--break-at, 22%),
    transparent var(--break-at, 22%), transparent calc(var(--break-at, 22%) + var(--break-w, 6%)),
    var(--ink) calc(var(--break-at, 22%) + var(--break-w, 6%)), var(--ink) 100%);
  transform-origin: left center;
  transform: scaleX(0);
  transition: transform 1s cubic-bezier(.6, .1, .2, 1);
}
.trace-track::after {
  /* two slashes marking the break */
  content: "//";
  position: absolute; top: 50%;
  left: calc(var(--break-at, 22%) + var(--break-w, 6%) / 2);
  transform: translate(-50%, -54%);
  color: var(--muted); font-weight: 600; font-size: 15px; letter-spacing: -2px;
  opacity: 0; transition: opacity .3s ease .6s;
}
.trace-track.drawn::before { transform: scaleX(1); }
.trace-track.drawn::after { opacity: 1; }

.ev {
  position: absolute; left: var(--x, 0); top: 50%;
  width: 0; height: 0;
  font-size: 14px; line-height: 1.3;
  opacity: 0; transition: opacity .35s ease;
  transition-delay: calc(.45s + var(--i, 0) * .09s);
}
.drawn .ev { opacity: 1; }
.ev::before {
  /* the dot */
  content: "";
  position: absolute; left: -6px; top: -6px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--paper); border: 2px solid var(--ink);
}
.ev.now::before { background: var(--accent); border-color: var(--accent); box-shadow: 0 0 0 5px var(--accent-soft); }
.lab {
  position: absolute; left: -6px; width: max-content; max-width: 13em;
  color: inherit; text-decoration: none; padding: 2px 4px; margin: -2px -4px; border-radius: 4px;
}
.lab:hover span, .lab:focus-visible span { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.ev:hover::before, .ev:focus-within::before { border-color: var(--accent); }

/* summary box: opens on the other side of the axis from the label */
.peek {
  position: absolute; left: -10px; z-index: 2;
  width: 17em; margin: 0; padding: 10px 12px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 8px;
  box-shadow: 0 6px 20px rgba(20, 30, 25, .08);
  font-size: 14px; line-height: 1.45; color: var(--ink);
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity .15s ease, transform .15s ease, visibility 0s linear .15s;
}
.up .peek { top: 16px; transform: translateY(-4px); }
.down .peek { bottom: 16px; transform: translateY(4px); }
.end .peek { left: auto; right: -10px; }
.ev:hover .peek, .ev:focus-within .peek {
  opacity: 1; visibility: visible; transform: none;
  transition: opacity .15s ease, transform .15s ease, visibility 0s;
}
.ev:hover, .ev:focus-within { z-index: 3; }
.up .lab { bottom: 18px; }
.down .lab { top: 18px; }
.end .lab { left: auto; right: -6px; text-align: right; }
.ev time { display: block; color: var(--muted); font-variant-numeric: tabular-nums; font-size: 13px; }
.ev span { display: block; font-weight: 600; }
.bar {
  /* service period drawn as a thick segment of the axis */
  position: absolute; top: 50%; left: var(--x); width: var(--w);
  height: 6px; margin-top: -3px; background: var(--ink);
  opacity: 0; transition: opacity .35s ease .4s;
}
.drawn .bar { opacity: 1; }

/* ── Sections ── */
main { padding-bottom: 32px; }
.row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding: 48px 0 0;
}
.row + .row { margin-top: 16px; }
.row > h2 {
  font-size: 15px; font-weight: 600; color: var(--muted);
  letter-spacing: 0; line-height: 1.9;
}
@media (min-width: 760px) {
  .row { grid-template-columns: var(--rail) 1fr; gap: 32px; padding-top: 64px; }
  .row > h2 { position: sticky; top: 24px; align-self: start; }
}

.entries { display: grid; gap: 40px; max-width: 760px; }
.entry { display: grid; gap: 10px; }
.entry > header { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 2px 16px; }
.entry h3 { font-size: 21px; font-weight: 700; letter-spacing: -0.015em; line-height: 1.25; }
.when { color: var(--muted); font-size: 14px; font-variant-numeric: tabular-nums; }
.role { font-weight: 500; }
.entry p, .entry li { max-width: var(--measure); }
.entry ul { padding-left: 1.1em; display: grid; gap: 6px; }
.entry li::marker { color: var(--muted); }
.stack { color: var(--muted); font-size: 15px; }
.go { display: flex; flex-wrap: wrap; gap: 4px 20px; font-weight: 600; font-size: 15px; }
.strong { font-weight: 700; }
.aka { font-weight: 400; color: var(--muted); font-size: 16px; letter-spacing: 0; }

/* where the timeline lands you */
.entry { scroll-margin-top: 24px; }
.entry:target { animation: landed 1.8s ease-out; border-radius: 6px; }
@keyframes landed {
  0%, 30% { background: var(--accent-soft); box-shadow: 0 0 0 12px var(--accent-soft); }
  100% { background: transparent; box-shadow: 0 0 0 12px transparent; }
}

/* the current job gets the one accent rule */
#work .entry:first-child { border-left: 3px solid var(--accent); padding-left: 18px; margin-left: -21px; }
@media (max-width: 759px) { #work .entry:first-child { margin-left: 0; } }

.toolkit { display: grid; grid-template-columns: 9em 1fr; gap: 10px 20px; max-width: 760px; }
.toolkit dt { color: var(--muted); font-size: 15px; line-height: 1.75; }
.toolkit dd { margin: 0; }

.archive { list-style: none; padding: 0; display: grid; gap: 8px; }
.archive a { font-weight: 600; }
.archive span { color: var(--muted); }
.archive span a { font-weight: 400; }

footer {
  margin-top: 88px; padding: 24px 0 64px;
  border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: 4px 32px;
  color: var(--muted); font-size: 15px;
}

/* ── Small screens: the trace becomes a vertical list ── */
@media (max-width: 719px) {
  .trace-track { height: auto; padding-left: 22px; display: grid; gap: 16px; }
  .trace-track::before {
    left: 5px; right: auto; top: 6px; bottom: 6px; width: 2px; height: auto; margin: 0;
    background: var(--ink); transform: scaleY(0); transform-origin: top center;
  }
  .trace-track.drawn::before { transform: scaleY(1); }
  .trace-track::after { display: none; }
  .ev { position: relative; left: auto; top: auto; width: auto; height: auto; }
  .ev::before { left: -22px; top: 4px; }
  .lab, .end .lab { position: static; display: block; max-width: none; text-align: left; margin: 0; padding: 0; }
  .peek { display: none; }
  .bar { display: none; }
  .intro { max-width: none; }
  .toolkit { grid-template-columns: 1fr; gap: 0; }
  .toolkit dd { margin-bottom: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .trace-track::before, .trace-track::after, .ev, .peek { transition: none !important; }
  .entry:target { animation: none; background: var(--accent-soft); }
}