/* ==========================================================================
   Duy Duong-Tran — personal site
   Tokens first. Change colors/fonts here and everything follows.
   ========================================================================== */

:root {
  --paper:   #F5F5F3;   /* page background (neutral stone) */
  --surface: #FFFFFF;   /* raised areas */
  --ink:     #232629;   /* body text */
  --muted:   #5A6067;   /* secondary text */
  --rule:    #D8D8D3;   /* hairlines */
  --crimson: #A51C30;   /* accent */
  --crimson-soft: #F3E3E5;
  --on-crimson: #FFFFFF;

  --serif: "Newsreader", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --sans:  "Public Sans", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --measure: 66ch;
  --wrap: 1080px;
  --gutter: clamp(1.1rem, 4vw, 2.5rem);
  color-scheme: light;
}

:root[data-theme="dark"] {
  --paper:   #15171A;
  --surface: #1D2024;
  --ink:     #E8E8E4;
  --muted:   #A3A8AE;
  --rule:    #33373C;
  --crimson: #EA6C80;
  --crimson-soft: #3A2328;
  --on-crimson: #15171A;
  color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper:   #15171A;
    --surface: #1D2024;
    --ink:     #E8E8E4;
    --muted:   #A3A8AE;
    --rule:    #33373C;
    --crimson: #EA6C80;
    --crimson-soft: #3A2328;
    --on-crimson: #15171A;
    color-scheme: dark;
  }
}

/* ---------- base ---------- */
*, *::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-family: var(--serif);
  font-size: 1.125rem;
  line-height: 1.65;
  font-optical-sizing: auto;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: var(--crimson); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--crimson); outline-offset: 3px; border-radius: 2px; }
::selection { background: var(--crimson); color: var(--on-crimson); }

.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }
.skip { position: absolute; left: -999px; top: 0; background: var(--crimson); color: var(--on-crimson); padding: .6rem 1rem; z-index: 100; font-family: var(--sans); }
.skip:focus { left: 0; }
.sans { font-family: var(--sans); }
.muted { color: var(--muted); }

h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.12; letter-spacing: -0.015em; margin: 0; text-wrap: balance; }
h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); }
h2 { font-size: clamp(1.55rem, 3vw, 2rem); }
h3 { font-size: 1.25rem; letter-spacing: -0.01em; }
p { margin: 0 0 1em; }
.prose { max-width: var(--measure); }
.prose p:last-child { margin-bottom: 0; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: saturate(1.2) blur(8px);
  border-bottom: 1px solid var(--rule);
}
.site-header .wrap { display: flex; align-items: center; gap: 1.25rem; min-height: 3.75rem; }
.brand {
  font-family: var(--serif); font-weight: 600; font-size: 1.2rem; letter-spacing: -0.01em;
  color: var(--ink); text-decoration: none; white-space: nowrap;
}
.brand:hover { color: var(--crimson); text-decoration: none; }
.nav { margin-left: auto; display: flex; align-items: center; gap: .15rem; font-family: var(--sans); font-size: .92rem; }
.nav a {
  color: var(--muted); text-decoration: none; padding: .45rem .7rem; border-bottom: 2px solid transparent;
}
.nav a:hover { color: var(--ink); }
.nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--crimson); font-weight: 500; }
.icon-btn {
  font: inherit; font-family: var(--sans); font-size: .85rem; color: var(--muted);
  background: none; border: 1px solid var(--rule); border-radius: 999px; padding: .3rem .75rem; cursor: pointer; margin-left: .5rem;
}
.icon-btn:hover { color: var(--ink); border-color: var(--muted); }
.menu-btn { display: none; margin-left: auto; }

@media (max-width: 860px) {
  .menu-btn { display: inline-block; }
  .nav {
    display: none; position: absolute; left: 0; right: 0; top: 100%;
    flex-direction: column; align-items: stretch; gap: 0; margin: 0;
    background: var(--paper); border-bottom: 1px solid var(--rule); padding: .5rem var(--gutter) 1rem;
  }
  .nav.is-open { display: flex; }
  .nav a { padding: .8rem 0; border-bottom: 1px solid var(--rule); }
  .nav a[aria-current="page"] { border-bottom-color: var(--crimson); }
  .nav .icon-btn { margin: .8rem 0 0; align-self: flex-start; }
}

/* ---------- hero ---------- */
.hero { padding-block: clamp(2.5rem, 7vw, 5.5rem) clamp(2rem, 5vw, 4rem); }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, .85fr); gap: clamp(2rem, 6vw, 4.5rem); align-items: center; }
.hero h1 .nb { white-space: nowrap; }
.hero h1 { font-size: clamp(2.6rem, 6vw, 4.5rem); letter-spacing: -0.03em; line-height: 1.02; font-weight: 600; }
.hero .role { font-family: var(--sans); font-size: .98rem; color: var(--muted); margin: 1.1rem 0 1.5rem; }
.hero .role strong { color: var(--ink); font-weight: 600; }
.hero .statement { font-size: clamp(1.2rem, 2.2vw, 1.5rem); line-height: 1.45; max-width: 40ch; margin-bottom: 1.4rem; text-wrap: balance; }
.hero .bio { max-width: 52ch; color: var(--ink); }
.cta-row { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.75rem; }
.btn {
  display: inline-block; font-family: var(--sans); font-weight: 500; font-size: .95rem; text-decoration: none;
  padding: .7rem 1.2rem; border: 1.5px solid var(--crimson); border-radius: 3px;
  background: var(--crimson); color: var(--on-crimson); cursor: pointer;
}
.btn:hover { text-decoration: none; filter: brightness(1.08); }
.btn.is-ghost { background: transparent; color: var(--crimson); }
.btn.is-ghost:hover { background: var(--crimson-soft); filter: none; }

.portrait { position: relative; justify-self: end; width: min(100%, 320px); margin-right: 1.1rem; }
.portrait::before {
  content: ""; position: absolute; inset: 1.1rem -1.1rem -1.1rem 1.1rem; background: var(--crimson); z-index: 0; border-radius: 2px;
}
.portrait img { position: relative; z-index: 1; width: 100%; height: auto; aspect-ratio: 4 / 5; object-fit: cover; object-position: 50% 18%; border-radius: 2px; background: var(--rule); }

@media (max-width: 760px) {
  .hero .wrap { grid-template-columns: 1fr; }
  .portrait { justify-self: start; width: min(78%, 300px); order: -1; margin-right: 1.1rem; }
}

/* ---------- sections ---------- */
.section { padding-block: clamp(2.5rem, 5vw, 4rem); border-top: 1px solid var(--rule); }
.section-head { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); gap: 1rem 3rem; align-items: baseline; margin-bottom: clamp(1.5rem, 3vw, 2.5rem); }
.section-head p { margin: 0; color: var(--muted); max-width: 52ch; }
@media (max-width: 760px) { .section-head { grid-template-columns: 1fr; } }

/* ---------- the career ledger (signature element) ---------- */
.ledger-key { display: flex; flex-wrap: wrap; gap: .4rem 1.5rem; font-family: var(--sans); font-size: .85rem; color: var(--muted); margin: 0 0 1.5rem; padding: 0; list-style: none; }
.ledger-key li { display: flex; align-items: center; gap: .5rem; }
.dot { width: .7rem; height: .7rem; display: inline-block; border: 2px solid var(--crimson); background: var(--crimson); }
.dot.is-research { background: var(--paper); }
.ledger { list-style: none; margin: 0; padding: 0; }
.ledger > li {
  --when: 8.5rem;
  position: relative; display: grid; grid-template-columns: var(--when) 2rem minmax(0, 1fr); padding-bottom: 2rem;
}
.ledger > li::before { /* the spine */
  content: ""; position: absolute; top: .55rem; bottom: -.55rem; left: calc(var(--when) + 1rem - 1px); width: 2px; background: var(--crimson); opacity: .35;
}
.ledger > li:last-child::before { bottom: auto; height: 0; }
.ledger > li::after { /* the node */
  content: ""; position: absolute; top: .45rem; left: calc(var(--when) + 1rem - 6px); width: 12px; height: 12px;
  background: var(--crimson); border: 2px solid var(--crimson);
}
.ledger > li.is-research::after { background: var(--paper); }
.ledger .when { font-family: var(--sans); font-size: .88rem; color: var(--muted); padding-top: .25rem; font-variant-numeric: tabular-nums; }
.ledger .what { grid-column: 3; }
.ledger h3 { font-size: 1.3rem; }
.ledger .where { font-family: var(--sans); font-size: .92rem; color: var(--muted); margin: .15rem 0 .5rem; }
.ledger p { margin: 0; max-width: 58ch; }
@media (max-width: 640px) {
  .ledger > li { --when: 0rem; grid-template-columns: 1.75rem minmax(0, 1fr); }
  .ledger > li::before { left: 5px; }
  .ledger > li::after { left: 0; }
  .ledger .when { grid-column: 2; padding-top: 0; }
  .ledger .what { grid-column: 2; }
}

/* ---------- facts strip ---------- */
.facts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin: 0; border-block: 1px solid var(--rule); }
.facts > div { padding: 1.2rem 1.2rem 1.2rem 0; }
.facts > div + div { padding-left: 1.2rem; border-left: 1px solid var(--rule); }
.facts dt { font-family: var(--sans); font-size: .85rem; color: var(--muted); order: 2; }
.facts dd { margin: 0; font-size: 2.1rem; font-weight: 600; letter-spacing: -0.02em; line-height: 1.1; }
.facts > div { display: flex; flex-direction: column; }
@media (max-width: 700px) {
  .facts { grid-template-columns: 1fr 1fr; }
  .facts > div:nth-child(3) { border-left: 0; padding-left: 0; }
  .facts > div:nth-child(n+3) { border-top: 1px solid var(--rule); }
}

/* ---------- columns (themes, audiences) ---------- */
.cols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2rem clamp(1.5rem, 3vw, 2.5rem); }
.cols > article { border-top: 3px solid var(--crimson); padding-top: 1rem; }
.cols h3 { margin-bottom: .6rem; }
.cols p { font-size: 1.02rem; line-height: 1.6; }
.cols .more { font-family: var(--sans); font-size: .9rem; }
@media (max-width: 860px) { .cols { grid-template-columns: 1fr; } }

/* ---------- recognition list ---------- */
.honors { list-style: none; margin: 0; padding: 0; display: grid; gap: 1.25rem; }
.honors li { border-left: 3px solid var(--crimson); padding: .1rem 0 .1rem 1rem; max-width: 70ch; }
.honors .award { font-family: var(--sans); font-weight: 600; font-size: .95rem; color: var(--crimson); }
.honors .title { display: block; }
.honors .meta { font-family: var(--sans); font-size: .85rem; color: var(--muted); }

/* ---------- news ---------- */
.news { list-style: none; margin: 0; padding: 0; }
.news li { display: grid; grid-template-columns: 6.5rem minmax(0, 1fr); gap: 1rem; padding: 1rem 0; border-top: 1px solid var(--rule); }
.news li:last-child { border-bottom: 1px solid var(--rule); }
.news time { font-family: var(--sans); font-size: .88rem; color: var(--muted); padding-top: .2rem; font-variant-numeric: tabular-nums; }
.news p { margin: 0; max-width: 64ch; }
.news .link { font-family: var(--sans); font-size: .88rem; margin-left: .35rem; white-space: nowrap; }
@media (max-width: 560px) { .news li { grid-template-columns: 1fr; gap: .15rem; } }

/* ---------- inner page header ---------- */
.page-head { padding-block: clamp(2.5rem, 6vw, 4.5rem) clamp(1.5rem, 3vw, 2.5rem); }
.page-head h1 { margin-bottom: 1rem; }
.page-head .lead { font-size: clamp(1.15rem, 2vw, 1.35rem); line-height: 1.5; color: var(--ink); max-width: 46ch; margin: 0; }

/* ---------- generic lists ---------- */
.plain { list-style: none; margin: 0; padding: 0; }
.rows > li, .rows > div.row { display: grid; grid-template-columns: 9rem minmax(0, 1fr); gap: .25rem 1.5rem; padding: .9rem 0; border-top: 1px solid var(--rule); }
.rows > li:last-child { border-bottom: 1px solid var(--rule); }
.rows .k { font-family: var(--sans); font-size: .88rem; color: var(--muted); padding-top: .2rem; font-variant-numeric: tabular-nums; }
.rows .v strong { font-weight: 600; }
.rows .sub { display: block; font-family: var(--sans); font-size: .88rem; color: var(--muted); }
@media (max-width: 600px) { .rows > li, .rows > div.row { grid-template-columns: 1fr; } }
.two { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem clamp(1.5rem, 4vw, 3.5rem); }
@media (max-width: 760px) { .two { grid-template-columns: 1fr; } }
.subhead { font-family: var(--sans); font-weight: 600; font-size: 1rem; margin: 0 0 .75rem; color: var(--ink); }
.tight li { margin-bottom: .55rem; }
ul.bul { margin: 0; padding-left: 1.2rem; }
ul.bul li { margin-bottom: .5rem; padding-left: .2rem; }
ul.bul li::marker { color: var(--crimson); }

/* ---------- publications ---------- */
.controls { position: sticky; top: 3.75rem; z-index: 20; background: var(--paper); padding: .9rem 0; border-bottom: 1px solid var(--rule); margin-bottom: 1.5rem; }
.controls .wrap { display: flex; flex-wrap: wrap; gap: .75rem 1rem; align-items: center; }
.search {
  font-family: var(--sans); font-size: .95rem; padding: .55rem .8rem; min-width: 14rem; flex: 1 1 14rem; max-width: 22rem;
  color: var(--ink); background: var(--surface); border: 1px solid var(--rule); border-radius: 3px;
}
.chips { display: flex; flex-wrap: wrap; gap: .4rem; }
.chip {
  font-family: var(--sans); font-size: .85rem; padding: .35rem .8rem; cursor: pointer;
  color: var(--muted); background: transparent; border: 1px solid var(--rule); border-radius: 999px;
}
.chip:hover { color: var(--ink); border-color: var(--muted); }
.chip[aria-pressed="true"] { background: var(--crimson); border-color: var(--crimson); color: var(--on-crimson); }
.count { font-family: var(--sans); font-size: .85rem; color: var(--muted); margin-left: auto; }

.pub-year { font-size: 1.4rem; margin: 2.2rem 0 .4rem; padding-bottom: .4rem; border-bottom: 1px solid var(--rule); }
.pub-list { list-style: none; margin: 0; padding: 0; }
.pub { padding: 1rem 0; border-bottom: 1px solid var(--rule); max-width: 78ch; }
.pub:last-child { border-bottom: 0; }
.pub .t { font-weight: 600; line-height: 1.3; display: block; }
.pub .a { font-size: .98rem; color: var(--muted); display: block; margin-top: .25rem; line-height: 1.5; }
.pub .a b { color: var(--ink); font-weight: 600; }
.pub .v { font-size: .98rem; display: block; margin-top: .2rem; }
.pub .v em { font-style: italic; }
.pub .tags { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem .75rem; margin-top: .45rem; font-family: var(--sans); font-size: .8rem; }
.pub .kind { color: var(--muted); border: 1px solid var(--rule); border-radius: 3px; padding: .08rem .45rem; }
.pub .award { color: var(--crimson); background: var(--crimson-soft); border-radius: 3px; padding: .12rem .5rem; font-weight: 600; }
.pub .links a { margin-right: .6rem; }
.empty { font-family: var(--sans); color: var(--muted); padding: 2rem 0; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--rule); margin-top: 2rem; padding-block: 2.5rem 3rem; font-family: var(--sans); font-size: .9rem; color: var(--muted); }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem 2rem; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--crimson); }
.site-footer .links { display: flex; flex-wrap: wrap; gap: .4rem 1.25rem; }

/* ---------- press kit bits ---------- */
.kit { display: grid; grid-template-columns: 160px minmax(0, 1fr); gap: 1.5rem; align-items: start; }
.kit img { width: 160px; height: auto; aspect-ratio: 4/5; object-fit: cover; object-position: 50% 18%; border-radius: 2px; }
@media (max-width: 520px) { .kit { grid-template-columns: 1fr; } }

/* ---------- print ---------- */
@media print {
  .site-header, .site-footer, .controls, .cta-row, .icon-btn { display: none !important; }
  body { background: #fff; color: #000; font-size: 11pt; }
  a { color: #000; text-decoration: none; }
  .section { border-top: 1px solid #bbb; padding-block: 1rem; }
  .portrait::before { display: none; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }