/* Edgar Cui — personal site, v2.
   A ruled ledger page: 28px rules, a red margin line, references in the margin,
   one drawn double rule, red tickmarks that stamp as rows are reviewed. No JavaScript. */
:root {
  --ink: #0D2137;
  --ink-2: #1B3554;
  --paper: #F5F7F9;
  --rule: #C9D6E3;
  --rule-soft: rgba(201, 214, 227, .55);
  --muted: #4A5A6B;
  --tick: #B3322D;
  --tick-soft: rgba(179, 50, 45, .28);
  --white: #FFFFFF;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", Consolas, monospace;
  --line: 28px;
  --gutter: clamp(16px, 4vw, 40px);
  --margin: 88px;           /* width of the reference column left of the red line */
  --ease: cubic-bezier(.2, .7, .2, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; overflow-x: clip; }
body { overflow-x: clip; }
::selection { background: var(--tick-soft); color: var(--ink); }

body {
  margin: 0;
  background-color: var(--paper);
  background-image: repeating-linear-gradient(to bottom, transparent 0, transparent calc(var(--line) - 1px), var(--rule-soft) calc(var(--line) - 1px), var(--rule-soft) var(--line));
  color: var(--ink);
  font: 400 17px/var(--line) var(--sans);
  font-variant-numeric: lining-nums tabular-nums;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
p, li, dd { text-wrap: pretty; }
h1, h2, h3, dt { text-wrap: balance; }

/* links: underline grows from the left */
a { color: var(--ink); text-decoration: none; background: linear-gradient(currentColor, currentColor) 0 100% / 0 1px no-repeat; transition: background-size .35s var(--ease); }
a:hover { background-size: 100% 1px; }
p a, .more a, .foot a { background-image: linear-gradient(var(--rule), var(--rule)), linear-gradient(currentColor, currentColor); background-size: 100% 1px, 0 1px; background-position: 0 100%, 0 100%; }
p a:hover, .more a:hover, .foot a:hover { background-size: 100% 1px, 100% 1px; }
:focus-visible { outline: 2px solid var(--tick); outline-offset: 3px; }

.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--white); padding: 0 12px; line-height: var(--line); z-index: 10; }
.skip:focus { left: 8px; }

/* page frame: reference column | red margin line | content */
.wrap { max-width: calc(1040px + var(--margin)); margin: 0 auto; padding: 0 var(--gutter); }
.ledger-page { position: relative; }
.ledger-page::before { content: ""; position: absolute; top: 0; bottom: 0; left: calc(var(--margin) - 14px); width: 1px; background: var(--tick-soft); pointer-events: none; }
.block, .hero { padding-left: var(--margin); position: relative; }
.ref { position: absolute; left: 0; width: calc(var(--margin) - 28px); text-align: right; font: 400 13px/var(--line) var(--mono); color: var(--muted); letter-spacing: .02em; }

/* header */
.top { position: sticky; top: 0; z-index: 5; background: rgba(245, 247, 249, .92); backdrop-filter: blur(6px); border-bottom: 1px solid var(--rule); }
.top-in { display: flex; align-items: center; justify-content: space-between; height: calc(var(--line) * 2); gap: 16px; padding-left: calc(var(--gutter) + var(--margin)); }
.mark { font: 600 18px/1 var(--serif); display: inline-flex; align-items: center; gap: 8px; background: none; }
.tick { color: var(--tick); font-family: var(--sans); font-weight: 600; }
nav { display: flex; gap: clamp(14px, 3vw, 32px); font-size: 15px; }
nav a { color: var(--muted); }
nav a:hover { color: var(--ink); }

/* hero */
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(220px, 320px); column-gap: calc(var(--line) * 3); row-gap: calc(var(--line) * 2); align-items: start; padding-top: calc(var(--line) * 4); padding-bottom: calc(var(--line) * 3); }
.hero h1 { grid-column: 1 / -1; }
.hero-text { padding-top: var(--line); }
.hero h1 { margin: 0; font: 600 clamp(64px, 13.5vw, 196px)/.86 var(--serif); letter-spacing: -.04em; font-optical-sizing: auto; }
.hero h1 .total { position: relative; display: inline-block; padding-bottom: .24em; border-bottom: .06em double var(--ink); }
.role { margin: 0 0 var(--line); font: 400 clamp(22px, 2.3vw, 28px)/calc(var(--line) * 1.5) var(--serif); max-width: 32ch; }
.lede { margin: 0 0 var(--line); color: var(--muted); max-width: 56ch; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 0; }
.btn { position: relative; display: inline-block; padding: 0 22px; line-height: calc(var(--line) * 1.5); font: 500 15px/calc(var(--line) * 1.5) var(--sans); color: var(--white); background: var(--ink); border: 1px solid var(--ink); overflow: hidden; isolation: isolate; transition: color .3s var(--ease); }
.btn::before { content: ""; position: absolute; inset: 0; background: var(--ink-2); transform: scaleX(0); transform-origin: left; transition: transform .35s var(--ease); z-index: -1; }
.btn:hover::before { transform: scaleX(1); }
.btn.ghost { color: var(--ink); background: transparent; }
.btn.ghost::before { background: var(--ink); }
.btn.ghost:hover { color: var(--white); }

.exhibit { margin: 0; justify-self: end; width: 100%; }
.exhibit img { display: block; width: 100%; height: auto; background: var(--white); border: 1px solid var(--rule); padding: 10px; }
.exhibit figcaption { margin-top: 0; font: 400 13px/var(--line) var(--mono); color: var(--muted); }

/* the one orchestrated moment: the total rule draws under the name, then the tick stamps */
@media (prefers-reduced-motion: no-preference) {
  .hero h1 .total { border-bottom-color: transparent; background: linear-gradient(var(--ink), var(--ink)) 0 calc(100% - .055em) / 0 .022em no-repeat, linear-gradient(var(--ink), var(--ink)) 0 100% / 0 .022em no-repeat; animation: draw 1.1s .35s var(--ease) forwards; }
  .hero .stamp { animation: stamp .45s 1.35s var(--ease) both; }
}
@keyframes draw { to { background-size: 100% .022em, 100% .022em; } }
@keyframes stamp { from { opacity: 0; transform: scale(1.8) rotate(-12deg); } to { opacity: 1; transform: none; } }
@keyframes stamp-sm { from { opacity: 0; transform: scale(1.3) rotate(-10deg); } to { opacity: 1; transform: none; } }
.stamp { position: absolute; left: 100%; top: .02em; margin-left: .08em; color: var(--tick); font: 600 .26em/1 var(--sans); }

/* sections */
.block { padding-top: calc(var(--line) * 3); }
.block h2 { margin: 0; font: 600 clamp(32px, 3.6vw, 44px)/calc(var(--line) * 2) var(--serif); letter-spacing: -.015em; }
.sub { margin: 0 0 var(--line); color: var(--muted); max-width: 60ch; }
.block .ref { top: calc(var(--line) * 3 + 14px); }

/* experience ledger */
.ledger { width: 100%; border-collapse: collapse; background: var(--white); border: 1px solid var(--rule); }
.ledger th { text-align: left; font: 500 13px/var(--line) var(--sans); color: var(--muted); padding: 0 16px; height: var(--line); border-bottom: 2px solid var(--ink); }
.ledger td { padding: 14px 16px; border-bottom: 1px solid var(--rule); vertical-align: top; transition: background-color .25s var(--ease); }
.ledger tbody tr:hover td { background: #F8FAFC; }
.ledger tr:last-child td { border-bottom: 0; }
.ledger .num { font: 400 14px/var(--line) var(--mono); white-space: nowrap; width: 1%; }
.ledger .note { display: block; color: var(--muted); font-size: 15.5px; max-width: 60ch; }
.ledger td:nth-child(3) { color: var(--muted); font-size: 15.5px; max-width: 26ch; }
.ledger .ck { color: var(--tick); font-weight: 600; width: 1%; text-align: center; }
.ledger tbody tr:hover .ck { transform: scale(1.15); }
.ledger .ck { transition: transform .25s var(--ease); }
@supports (animation-timeline: view()) {
  @media (prefers-reduced-motion: no-preference) {
    .ledger .ck { animation: stamp-sm linear both; animation-timeline: view(); animation-range: entry 40% cover 35%; }
  }
}

/* accounts */
.accounts { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 2px solid var(--ink); }
.acct { padding: 14px 20px var(--line) 0; }
.acct + .acct { padding-left: 20px; border-left: 1px solid var(--rule); }
.acct h3 { margin: 0 0 0; font: 600 19px/var(--line) var(--serif); }
.acct p { margin: 0; color: var(--muted); font-size: 15.5px; }

/* selected work */
.work { margin: 0; display: grid; grid-template-columns: 1fr 1fr; column-gap: 56px; }
.work > div { padding: 14px 0 var(--line); border-top: 1px solid var(--rule); }
.work dt { font: 600 21px/var(--line) var(--serif); margin-bottom: 0; }
.work dd { margin: 0; color: var(--muted); max-width: 58ch; }

/* principles */
.ticks { list-style: none; margin: 0; padding: 0; columns: 2; column-gap: 56px; }
.ticks li { break-inside: avoid; padding: 0 0 0 30px; position: relative; border-bottom: 1px solid var(--rule); min-height: calc(var(--line) * 2); display: flex; align-items: center; }
.ticks li::before { content: "✓"; position: absolute; left: 4px; color: var(--tick); font-weight: 600; }
.more { margin: var(--line) 0 0; color: var(--muted); }

/* contact: the closing total */
.contact p { max-width: 60ch; margin: 0; }
.total-line { display: inline-block; margin-top: var(--line); padding-bottom: 6px; border-bottom: 4px double var(--ink); font: 500 clamp(22px, 3.2vw, 34px)/calc(var(--line) * 2) var(--mono); }
.total-line a { background: none; }
.total-line a:hover { color: var(--tick); }

/* footer + colophon */
.foot { margin-top: calc(var(--line) * 4); border-top: 1px solid var(--rule); background: var(--paper); }
.foot-in { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0 24px; padding-top: var(--line); padding-bottom: var(--line); padding-left: calc(var(--gutter) + var(--margin)); font-size: 14px; color: var(--muted); }
.foot-in a { color: var(--muted); margin-right: 16px; }
.colophon { flex-basis: 100%; margin: 0; font-size: 13px; }

/* 404 */
.nf { padding-top: calc(var(--line) * 6); padding-bottom: calc(var(--line) * 4); }
.nf h1 { margin: 0 0 var(--line); font: 600 clamp(44px, 7vw, 88px)/1 var(--serif); letter-spacing: -.02em; }

/* responsive */
@media (max-width: 960px) {
  :root { --margin: 0px; }
  .ledger-page::before, .ref { display: none; }
  .top-in, .foot-in { padding-left: var(--gutter); }
  .hero { grid-template-columns: minmax(0, 1fr) 220px; column-gap: calc(var(--line) * 1.5); row-gap: var(--line); padding-top: calc(var(--line) * 2); }
  .hero-text { padding-top: 0; }
  .exhibit { justify-self: start; width: min(100%, 300px); }
  .accounts { grid-template-columns: 1fr 1fr; }
  .acct:nth-child(3) { padding-left: 0; border-left: 0; }
  .work { grid-template-columns: 1fr; }
  .ticks { columns: 1; }
}
@media (max-width: 600px) {
  nav a:nth-child(3) { display: none; }
  .hero { grid-template-columns: 1fr; }
  .hero h1 { font-size: clamp(64px, 20vw, 104px); }
  .role { font-size: 21px; line-height: var(--line); }
  .exhibit { width: 220px; }
  .ledger thead { display: none; }
  .ledger, .ledger tbody, .ledger tr, .ledger td { display: block; width: 100%; }
  .ledger tr { border-bottom: 1px solid var(--rule); padding: 14px 0; position: relative; }
  .ledger tr:last-child { border-bottom: 0; }
  .ledger td { border: 0; padding: 0 44px 0 16px; }
  .ledger .ck { position: absolute; right: 12px; top: 14px; width: auto; }
  .accounts { grid-template-columns: 1fr; }
  .acct, .acct + .acct { padding-left: 0; border-left: 0; border-bottom: 1px solid var(--rule); }
}

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

/* print: the page becomes a one-page CV */
@media print {
  @page { margin: 14mm; }
  body { background: none; font-size: 10.5pt; line-height: 1.45; }
  .top, .skip, .cta, .foot nav, .more, .ledger-page::before, .ref { display: none !important; }
  .block, .hero { padding-left: 0; }
  .hero { padding: 0 0 8pt; grid-template-columns: 1fr 90pt; gap: 16pt; }
  .hero h1 { font-size: 34pt; margin-bottom: 6pt; }
  .role { font-size: 13pt; line-height: 1.3; margin-bottom: 6pt; }
  .block { padding-top: 10pt; break-inside: avoid; }
  .block h2 { font-size: 15pt; line-height: 1.3; }
  .ledger, .ledger td { border-color: #999; }
  .total-line { font-size: 13pt; line-height: 1.4; }
  a { background: none !important; }
  .contact a::after { content: ""; }
}