/* ViFA-Council project page
   Layout: one centred reading column (46rem) that widens to 70rem for figures, tables and galleries.
   Palette: white ground, near-black ink, an indigo accent, with the red and yellow of Dong Ho prints kept for small marks. */

:root {
  --paper: #ffffff;
  --surface: #f5f6f8;
  --ink: #14171f;
  --muted: #5a6170;
  --line: #dfe2e8;
  --accent: #1f3f94;
  --accent-soft: #edf1fb;
  --red: #a83a2c;
  --yellow: #d4a021;
  --on-accent: #ffffff;
  --shade: rgba(15, 18, 26, 0.74);

  --font-display: "Be Vietnam Pro", "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
  --font-body: "Literata", "Noto Serif", Georgia, "Times New Roman", serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --text: 46rem;
  --wide: 70rem;
  --gutter: clamp(1rem, 4vw, 2rem);
  --radius: 6px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0f1116;
    --surface: #171a22;
    --ink: #e9ebf1;
    --muted: #9aa1b0;
    --line: #2a2f3b;
    --accent: #93abff;
    --accent-soft: #1b2238;
    --red: #e58573;
    --yellow: #e3ba4f;
    --on-accent: #0f1116;
    --shade: rgba(3, 4, 8, 0.84);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --paper: #0f1116;
  --surface: #171a22;
  --ink: #e9ebf1;
  --muted: #9aa1b0;
  --line: #2a2f3b;
  --accent: #93abff;
  --accent-soft: #1b2238;
  --red: #e58573;
  --yellow: #e3ba4f;
  --on-accent: #0f1116;
  --shade: rgba(3, 4, 8, 0.84);
  color-scheme: dark;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 4.5rem; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}

[hidden] { display: none !important; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
p { margin: 0; }
em { font-style: italic; }

/* ---------- top navigation ---------- */
.topbar {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 20;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: var(--wide);
  margin-inline: auto;
  padding-inline: var(--gutter);
  padding-block: 0.6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  white-space: nowrap;
}
.seal {
  width: 1.15rem;
  height: 1.15rem;
  background: var(--red);
  border-radius: 3px;
  display: inline-block;
  flex: none;
}
.topnav {
  display: flex;
  gap: clamp(0.7rem, 2vw, 1.5rem);
  overflow-x: auto;
  scrollbar-width: none;
  min-width: 0;
}
.topnav::-webkit-scrollbar { display: none; }
.topnav a {
  font-family: var(--font-display);
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  padding-block: 0.2rem;
}
.topnav a:hover { color: var(--ink); }

/* ---------- hero ---------- */
.hero {
  max-width: var(--wide);
  margin-inline: auto;
  padding-inline: var(--gutter);
  padding-block: clamp(2.5rem, 7vw, 4.5rem) clamp(1.5rem, 4vw, 2.5rem);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.35rem;
}
.venue {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--red);
}
.hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.9rem, 5.2vw, 3.25rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
  max-width: 24ch;
  text-wrap: balance;
}
.hero h1 span { color: var(--accent); display: block; }
.authors {
  font-family: var(--font-display);
  font-size: clamp(0.98rem, 2.2vw, 1.1rem);
  font-weight: 500;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.25rem 1.1rem;
  max-width: 48rem;
}
.authors sup, .affils sup { font-size: 0.68em; color: var(--muted); font-weight: 500; margin-left: 0.1em; }
.affils {
  font-family: var(--font-display);
  font-size: 0.9rem;
  color: var(--muted);
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}
.affils .note { font-size: 0.82rem; margin-top: 0.35rem; }
.links { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem; margin-top: 0.3rem; }
.btn {
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.15rem;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  cursor: pointer;
  transition: transform 0.15s ease, background-color 0.15s ease;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn svg { width: 1.05em; height: 1.05em; flex: none; }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.ghost:hover { border-color: var(--ink); }

/* five printing blocks, one per colour */
.blocks { display: flex; gap: 4px; justify-content: center; }
.blocks i { width: 2.2rem; height: 5px; border-radius: 1px; display: block; }
.blocks i:nth-child(1) { background: var(--ink); }
.blocks i:nth-child(2) { background: var(--red); }
.blocks i:nth-child(3) { background: var(--yellow); }
.blocks i:nth-child(4) { background: var(--accent); }
.blocks i:nth-child(5) { background: var(--surface); box-shadow: inset 0 0 0 1px var(--line); }

/* ---------- shared section scaffolding ---------- */
.wide { max-width: var(--wide); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: clamp(2.5rem, 6vw, 4rem); border-top: 1px solid var(--line); }
.section.tint { background: var(--surface); }
.prose { max-width: var(--text); margin-inline: auto; display: flex; flex-direction: column; gap: 1rem; }
.section > .wide { display: flex; flex-direction: column; gap: clamp(1.5rem, 3.5vw, 2.25rem); }
.eyebrow {
  font-family: var(--font-display);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
}
h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 3.4vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.08rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.lede { font-size: 1.14rem; line-height: 1.62; }

/* ---------- figures ---------- */
figure { margin: 0; display: flex; flex-direction: column; gap: 0.7rem; }
figcaption {
  font-family: var(--font-display);
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--muted);
  max-width: var(--text);
  margin-inline: auto;
  text-align: center;
}
.plate {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(0.5rem, 1.5vw, 1rem);
}
.zoom {
  all: unset;
  display: block;
  cursor: zoom-in;
  width: 100%;
  border-radius: 3px;
}
.zoom:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.zoom img { width: 100%; border-radius: 3px; }

/* teaser: source -> two outputs */
.teaser { display: grid; grid-template-columns: 0.8fr 1fr 1fr; gap: clamp(0.6rem, 1.6vw, 1.1rem); align-items: start; }
.teaser .cell { display: flex; flex-direction: column; gap: 0.5rem; min-width: 0; }
.teaser .frame { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 0.45rem; }
.tag {
  font-family: var(--font-display);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 0.45rem;
}
.tag::before { content: ""; width: 0.55rem; height: 0.55rem; border-radius: 1px; background: var(--muted); flex: none; }
.tag.out::before { background: var(--accent); }
.tag.story::before { background: var(--red); }

/* ---------- method ---------- */
.stages { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1rem, 2.5vw, 2rem); counter-reset: stage; margin: 0; padding: 0; list-style: none; }
.stages li { counter-increment: stage; display: flex; flex-direction: column; gap: 0.5rem; padding-top: 0.9rem; border-top: 3px solid var(--ink); min-width: 0; }
.stages li:nth-child(2) { border-top-color: var(--accent); }
.stages li:nth-child(3) { border-top-color: var(--red); }
.stages li::before {
  content: "Stage " counter(stage);
  font-family: var(--font-display);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
}
.stages p { font-size: 0.98rem; line-height: 1.6; }
.formula { font-family: var(--font-mono); font-size: 0.82rem; color: var(--muted); }

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.section.tint .table-wrap { background: var(--paper); }
table { border-collapse: collapse; width: 100%; font-family: var(--font-display); font-size: 0.9rem; font-variant-numeric: tabular-nums; }
caption { caption-side: top; text-align: left; padding: 0.8rem 1rem 0.65rem; font-weight: 600; font-size: 0.92rem; border-bottom: 1px solid var(--line); }
caption small { display: block; font-weight: 400; color: var(--muted); font-size: 0.82rem; margin-top: 0.15rem; }
th, td { padding: 0.6rem 1rem; text-align: right; white-space: nowrap; border-bottom: 1px solid var(--line); }
th:first-child, td:first-child { text-align: left; }
thead th { font-size: 0.76rem; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
tbody tr:last-child td, tbody tr:last-child th { border-bottom: 0; }
tbody th { font-weight: 500; }
tr.ours th, tr.ours td { background: var(--accent-soft); font-weight: 600; }
td.best { color: var(--accent); font-weight: 700; }
table.schema td, table.schema th { text-align: left; white-space: normal; vertical-align: top; }
table.schema code { white-space: nowrap; }
table.schema td:first-child { color: var(--muted); white-space: nowrap; }
code { font-family: var(--font-mono); font-size: 0.86em; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(1rem, 2.5vw, 1.75rem); align-items: start; }
.pair > * { min-width: 0; }
.pair th, .pair td { padding-inline: 0.7rem; }

/* failure modes */
.modes { display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(1rem, 2.4vw, 1.75rem); margin: 0; padding: 0; list-style: none; }
.modes li { display: flex; flex-direction: column; gap: 0.35rem; min-width: 0; }
.modes p { font-size: 0.94rem; line-height: 1.55; color: var(--muted); }
.modes .who { font-family: var(--font-display); font-size: 0.74rem; font-weight: 600; letter-spacing: 0.07em; text-transform: uppercase; color: var(--red); }

/* ---------- outpainting gallery ---------- */
.picker { display: flex; gap: 0.5rem; overflow-x: auto; padding-bottom: 0.25rem; }
.picker button {
  font-family: var(--font-display);
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.4rem 0.95rem;
  cursor: pointer;
  white-space: nowrap;
  flex: none;
}
.picker button:hover { color: var(--ink); border-color: var(--muted); }
.picker button[aria-selected="true"] { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.compare { display: grid; grid-template-columns: minmax(0, 0.62fr) minmax(0, 1fr); gap: clamp(0.75rem, 2vw, 1.5rem); align-items: center; }
.compare .cell { display: flex; flex-direction: column; gap: 0.5rem; min-width: 0; }
.compare .frame { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 0.45rem; }
.section.tint .compare .frame { background: var(--paper); }
.note { font-family: var(--font-display); font-size: 0.86rem; color: var(--muted); }

/* ---------- story carousel ---------- */
.carousel { display: flex; flex-direction: column; gap: 0.9rem; }
.track { display: flex; align-items: flex-start; gap: 1rem; overflow-x: auto; scroll-snap-type: x mandatory; scrollbar-width: thin; padding-bottom: 0.5rem; }
.slide { flex: 0 0 min(100%, 58rem); scroll-snap-align: center; display: flex; flex-direction: column; gap: 0.6rem; min-width: 0; }
.slide .frame { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 0.45rem; }
.slide .meta { display: flex; align-items: center; gap: 0.8rem; font-family: var(--font-display); font-size: 0.9rem; }
.slide .meta img { width: 4.2rem; height: 3.1rem; object-fit: cover; border-radius: 3px; border: 1px solid var(--line); flex: none; }
.slide .meta span { color: var(--muted); display: block; font-size: 0.8rem; }
.controls { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.controls .count { font-family: var(--font-display); font-size: 0.86rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.arrows { display: flex; gap: 0.5rem; }
.arrows button {
  width: 2.5rem; height: 2.5rem; border-radius: 50%;
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  cursor: pointer; display: grid; place-items: center;
}
.arrows button:hover { border-color: var(--ink); }
.arrows svg { width: 1rem; height: 1rem; }

/* ---------- bibtex ---------- */
.bib { position: relative; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.section.tint .bib { background: var(--paper); }
.bib pre { margin: 0; padding: 1.1rem 1.2rem; overflow-x: auto; font-family: var(--font-mono); font-size: 0.82rem; line-height: 1.65; }
.bib .copy {
  position: absolute; top: 0.6rem; right: 0.6rem;
  font-family: var(--font-display); font-size: 0.78rem; font-weight: 600;
  padding: 0.3rem 0.75rem; border-radius: 999px;
  border: 1px solid var(--line); background: var(--paper); color: var(--ink); cursor: pointer;
}
.bib .copy:hover { border-color: var(--ink); }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--line); padding-block: 2rem 2.5rem; }
.footer .wide { display: flex; flex-direction: column; gap: 0.5rem; align-items: center; text-align: center; font-family: var(--font-display); font-size: 0.84rem; color: var(--muted); }

/* ---------- lightbox ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 50;
  background: var(--shade);
  display: grid; place-items: center;
  padding: clamp(0.75rem, 3vw, 2rem);
  cursor: zoom-out;
}
.lightbox img { max-width: 100%; max-height: calc(100vh - 4rem); width: auto; height: auto; border-radius: 4px; background: #fff; }
.lightbox .close {
  position: absolute; top: calc(env(safe-area-inset-top, 0px) + 0.75rem); right: 0.9rem;
  font-family: var(--font-display); font-size: 0.82rem; font-weight: 600;
  padding: 0.4rem 0.9rem; border-radius: 999px; border: 0;
  background: var(--paper); color: var(--ink); cursor: pointer;
}

/* ---------- narrow screens ---------- */
@media (max-width: 860px) {
  .modes { grid-template-columns: repeat(2, 1fr); }
  .pair { grid-template-columns: 1fr; }
}
@media (max-width: 680px) {
  body { font-size: 1rem; }
  .teaser { grid-template-columns: 1fr; }
  .stages { grid-template-columns: 1fr; }
  .compare { grid-template-columns: 1fr; }
  .modes { grid-template-columns: 1fr; }
  .brand .long { display: none; }
  th, td { padding: 0.55rem 0.75rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}

/* flex and grid children must be allowed to shrink so wide tables scroll inside their own box */
.section > .wide > *, .prose > *, .carousel > *, .hero > *, figure > * { min-width: 0; }
.prose { width: 100%; }
table.schema { min-width: 40rem; }
.slide .zoom img { aspect-ratio: 11 / 6; object-fit: contain; }