/* =========================================================================
   Phong Trang — personal site
   Hand-written. No framework, no JS, no webfont downloads.
   ========================================================================= */

:root {
  /* Dark is the default for everyone; there is no light variant. */
  color-scheme: dark;
  --bg:      #171a18;
  --surface: #1f241f;
  --text:    #e9ece8;
  --muted:   #a6aea5;
  --rule:    #303830;
  --accent:  #7fcf9f;
  --accent-bg: #1f2b22;

  --serif: ui-serif, Georgia, "Iowan Old Style", "Palatino Linotype", Charter, serif;
  --sans:  system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono:  ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --wrap: 46rem;
  --step: 1.6rem;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  font-synthesis-weight: none;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

/* --- Links --------------------------------------------------------------- */

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--bg);
  padding: 0.6rem 1rem;
  z-index: 10;
  text-decoration: none;
}
.skip-link:focus { left: 0; }

/* --- Header -------------------------------------------------------------- */

.site-head {
  border-bottom: 1px solid var(--rule);
  padding-block: 1.1rem;
  margin-bottom: 3rem;
}
.site-head .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  align-items: baseline;
  justify-content: space-between;
}
.brand {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--accent); }

/* Row gap is deliberately tighter than the column gap: when the nav wraps on a
   narrow screen, a symmetric gap strands the last item under a large void. */
.site-head nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.15rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-head nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.94rem;
}
.site-head nav a:hover { color: var(--accent); }
.site-head nav a[aria-current="page"] {
  color: var(--text);
  font-weight: 600;
  box-shadow: inset 0 -2px 0 var(--accent);
}

/* --- Typography ---------------------------------------------------------- */

.prose { padding-bottom: 4rem; }

h1, h2, h3, h4 {
  font-family: var(--serif);
  line-height: 1.2;
  letter-spacing: -0.015em;
  font-weight: 600;
  text-wrap: balance;
}

h1 { font-size: clamp(1.9rem, 5vw, 2.4rem); margin: 0 0 0.5rem; }
h2 {
  font-size: 1.4rem;
  margin: 3rem 0 1rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--rule);
}
h3 { font-size: 1.12rem; margin: 2rem 0 0.4rem; }

.page-head { margin-bottom: 2.5rem; }
.page-head h1 { margin-bottom: 0.6rem; }

.standfirst {
  font-size: 1.12rem;
  color: var(--muted);
  margin: 0;
  max-width: 34rem;
  text-wrap: pretty;
}

p { margin: 0 0 1.15rem; text-wrap: pretty; }
strong { font-weight: 640; }

ul, ol { padding-left: 1.25rem; }
li { margin-bottom: 0.4rem; }

hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0; }

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--surface);
  padding: 0.12em 0.36em;
  border-radius: 3px;
}

img { max-width: 100%; height: auto; }

blockquote {
  margin: 1.5rem 0;
  padding-left: 1.1rem;
  border-left: 2px solid var(--rule);
  color: var(--muted);
}

/* --- Home: hero ---------------------------------------------------------- */

.hero {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  gap: 2rem;
  align-items: start;
  margin-bottom: 3rem;
}
.hero img {
  width: 8.5rem;
  height: 8.5rem;
  border-radius: 50%;
  object-fit: cover;
  background: var(--surface);
}
.hero-name {
  font-family: var(--serif);
  font-size: clamp(1.9rem, 5vw, 2.3rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
  line-height: 1.1;
}
.role {
  font-size: 0.95rem;
  color: var(--muted);
  margin: 0 0 0.5rem;
}
.identity {
  font-family: var(--serif);
  font-size: 1.22rem;
  line-height: 1.45;
  color: var(--text);
  margin: 0 0 0.9rem;
  text-wrap: pretty;
}
.affil {
  font-size: 0.95rem;
  color: var(--muted);
  margin: 0;
}

@media (max-width: 34rem) {
  .hero { grid-template-columns: 1fr; gap: 1.25rem; }
  .hero img { width: 6.5rem; height: 6.5rem; }
}

/* --- Home: glance strip ---------------------------------------------------
   The trajectory in one line: country, org, publication, and the loop
   closing (teacher -> builder -> back to education). Pure CSS, no images:
   flags are drawn with gradients and a unicode star so they render the
   same on every platform (emoji flags fall back to letter codes on
   Windows). Decorative only, hence aria-hidden on the chips. */

.glance {
  list-style: none;
  margin: 0 0 3rem;
  padding: 1.35rem 0 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0 0.9rem;
}
.glance li {
  position: relative;
  margin: 0;
  font-size: 0.8rem;
  line-height: 1.45;
}
/* Each node draws its own segment of the line, so the strip survives any
   column count without a separately positioned rule. */
.glance li::before {
  content: "";
  position: absolute;
  top: -0.89rem;
  left: 0;
  right: -0.9rem;   /* bridge the grid gap to the next node */
  height: 2px;
  background: var(--rule);
}
.glance li:last-child::before { right: 0; }
.glance li::after {
  content: "";
  position: absolute;
  top: -1.2rem;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
}
/* The final node is the open end: outlined, not filled. */
.glance li:last-child::after {
  background: var(--bg);
  border-color: var(--accent);
}
/* Node anatomy: flag + city (quiet eyebrow line), org (the bold anchor;
   read down the column and the repetition of "University of Gothenburg"
   draws the loop closing), then role, then dates. */
.g-org, .g-what, .g-when { display: block; }
.g-city { color: var(--muted); margin-left: 0.3rem; }
.g-org { font-weight: 600; margin-top: 0.25rem; }
.g-what { color: var(--muted); }
.g-when {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  margin-top: 0.15rem;
}

.flag {
  display: inline-block;
  width: 1.3rem;
  height: 0.9rem;
  border-radius: 2px;
  box-shadow: inset 0 0 0 1px rgba(128, 128, 128, 0.25);
  position: relative;
  vertical-align: baseline;
}
.flag-vn { background: #da251d; }
.flag-vn::after {
  content: "\2605";
  color: #ffcd00;
  font-size: 0.62rem;
  line-height: 1;
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.flag-se {
  background-color: #0059a3;
  background-image:
    linear-gradient(to bottom, transparent 40%, #fecb00 40%, #fecb00 62%, transparent 62%),
    linear-gradient(to right, transparent 28%, #fecb00 28%, #fecb00 44%, transparent 44%);
}
.flag-us {
  /* Seven stripes, not thirteen: at 20x14px, thirteen blur into moire. */
  background: repeating-linear-gradient(to bottom,
    #b22234 0 14.28%, #f4f5f0 14.28% 28.57%);
}
.flag-us::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 45%;
  height: 55%;
  background-color: #3c3b6e;
  background-image: radial-gradient(#f4f5f0 18%, transparent 24%);
  background-size: 3px 3px;
  border-top-left-radius: 2px;
}

@media (max-width: 40rem) {
  .glance {
    grid-template-columns: 1fr;
    padding: 0 0 0 1.35rem;
    gap: 0;
  }
  .glance li { padding-block: 0.45rem; }
  .glance li::before {
    top: 0;
    bottom: 0;
    left: -1.05rem;
    right: auto;
    width: 2px;
    height: auto;
  }
  .glance li:first-child::before { top: 0.75rem; }
  .glance li:last-child::before { height: 0.75rem; bottom: auto; }
  .glance li::after {
    top: 0.75rem;
    left: -1.35rem;
  }
}

/* --- News ---------------------------------------------------------------- */

.news { list-style: none; padding: 0; margin: 0; }
.news li {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--rule);
  margin: 0;
}
.news li:last-child { border-bottom: 0; }
.news .when {
  color: var(--muted);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
  padding-top: 0.16rem;
  white-space: nowrap;
}
.news .what { margin: 0; }

@media (max-width: 34rem) {
  .news li { grid-template-columns: 1fr; gap: 0.15rem; }
  .news .when { font-size: 0.78rem; letter-spacing: 0.04em; text-transform: uppercase; }
}

/* --- Cards / work -------------------------------------------------------- */

.card {
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1.4rem 1.5rem;
  margin-bottom: 1.25rem;
  background: var(--surface);
}
.card h3 { margin-top: 0; }
.card > :last-child { margin-bottom: 0; }

.card-meta {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0 0 0.8rem;
}

.thread {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--accent);
  background: var(--accent-bg);
  border-radius: 999px;
  padding: 0.12rem 0.6rem;
  margin-bottom: 0.7rem;
}

.outcomes { list-style: none; padding: 0; margin: 0.8rem 0; }
.outcomes li {
  padding-left: 1.1rem;
  position: relative;
  font-size: 0.95rem;
  margin-bottom: 0.28rem;
}
.outcomes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.stack {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
  margin: 0.8rem 0 0;
}

.stack-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1rem 0 0;
}

.stack-badges img {
  height: 28px;
  width: auto;
}

.status-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid currentColor;
  border-radius: 3px;
  padding: 0.08rem 0.42rem;
  vertical-align: 0.18em;
  margin-left: 0.5rem;
}

/* --- Instrument screenshot placeholder ----------------------------------- */

.shot-placeholder {
  border: 1px dashed var(--rule);
  border-radius: 8px;
  background: var(--bg);
  padding: 3rem 1.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
  margin: 1.5rem 0;
}

/* --- Publications -------------------------------------------------------- */

.pubs { list-style: none; padding: 0; margin: 0; }
.pubs > li {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--rule);
  margin: 0;
}
.pubs > li:last-child { border-bottom: 0; }
.pub-title { font-weight: 600; margin: 0 0 0.3rem; }
.pub-authors, .pub-venue { margin: 0 0 0.25rem; font-size: 0.95rem; }
.pub-venue { color: var(--muted); font-style: italic; }
.pub-note { font-size: 0.92rem; color: var(--muted); margin: 0.45rem 0 0; }
.pub-links { font-size: 0.88rem; margin: 0.45rem 0 0; }
.pub-links a + a { margin-left: 0.85rem; }

.todo-flag {
  background: var(--accent-bg);
  color: var(--accent);
  border-radius: 3px;
  padding: 0.05em 0.35em;
  font-size: 0.85em;
  font-family: var(--mono);
}

/* --- Provenance / breadcrumb (portfolio archive) ------------------------- */

.crumb { font-size: 0.88rem; color: var(--muted); margin-bottom: 1.5rem; }
.crumb span { margin: 0 0.35rem; }

.provenance {
  border-left: 3px solid var(--accent);
  background: var(--accent-bg);
  border-radius: 0 6px 6px 0;
  padding: 0.9rem 1.1rem;
  margin: 0 0 2.5rem;
  font-size: 0.92rem;
}
.provenance p { margin: 0; }

/* Old portfolio bodies carry inline styles and shields.io badges.
   Keep them contained rather than fighting them. */
.portfolio-item img[src*="shields.io"] { display: inline-block; margin: 0 2px 2px 0; }
.portfolio-item table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.portfolio-item th, .portfolio-item td {
  border: 1px solid var(--rule); padding: 0.45rem 0.6rem; text-align: left;
}
.portfolio-item div[style*="background"] { border-radius: 8px; }

/* --- Empty section ------------------------------------------------------- */

.empty {
  color: var(--muted);
  font-style: italic;
  border: 1px dashed var(--rule);
  border-radius: 6px;
  padding: 1.2rem 1.4rem;
}
.empty p { margin: 0; }

/* --- Footer -------------------------------------------------------------- */

.site-foot {
  border-top: 1px solid var(--rule);
  padding-block: 2rem 3rem;
  margin-top: 2rem;
  font-size: 0.9rem;
}
.foot-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.5rem;
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
}
.foot-links li { margin: 0; }
.colophon { color: var(--muted); margin: 0; font-size: 0.85rem; }

/* --- Motion / print ------------------------------------------------------ */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

@media print {
  .site-head nav, .subtabs, .site-foot, .skip-link, .provenance, .cv-actions { display: none; }
  body { background: #fff; color: #000; font-size: 10.5pt; line-height: 1.42; }
  a { color: #000; }
  .prose { padding-bottom: 0; }
  .page-head { margin-bottom: 1rem; }
  h2 { margin: 1rem 0 0.35rem; padding-top: 0.7rem; font-size: 1.15rem; break-after: avoid; }
  h3 { margin: 0.7rem 0 0.2rem; break-after: avoid; }
  p { margin: 0 0 0.5rem; }
  li { margin-bottom: 0.15rem; }
  .card, .pubs > li { break-inside: avoid; }
}

/* --- Hover menus and section sub-tabs ------------------------------------ */

.site-head nav .has-menu { position: relative; }
.site-head nav .chev {
  display: inline-block;
  width: 0.38em; height: 0.38em;
  margin-left: 0.4em;
  border: solid currentColor;
  border-width: 0 1.5px 1.5px 0;
  transform: translateY(-0.15em) rotate(45deg);
}
.site-head nav .menu {
  display: none;
  flex-direction: column;
  gap: 0.1rem;
  position: absolute;
  top: 100%;
  left: -0.75rem;
  min-width: 11rem;
  padding: 0.4rem;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 6px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
  z-index: 10;
}
.site-head nav .menu a { display: block; padding: 0.35rem 0.6rem; }
@media (hover: hover) {
  .site-head nav .has-menu:hover .menu,
  .site-head nav .has-menu:focus-within .menu { display: flex; }
}

.subtabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.15rem;
  margin: 0 0 2rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--rule);
}
.subtabs a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.94rem;
}
.subtabs a:hover { color: var(--accent); }
.subtabs a[aria-current="page"] {
  color: var(--text);
  font-weight: 600;
  box-shadow: inset 0 -2px 0 var(--accent);
}

/* Phones: no hover menu, so no chevron, and a tighter row keeps four items on one line. */
@media (max-width: 480px) {
  .site-head nav ul { gap: 0.35rem 0.9rem; }
  .site-head nav .chev { display: none; }
}