/* ==========================================================================
   ImageCAS-X — project page

   Deliberately plain: baby blue bands on a near-white paper, Nunito
   throughout, no illustration, no decorative accents. `--band` is #cfe2f3 —
   sampled straight out of the graphical abstract — so the nav, header and
   footer are the same blue as the figure and it reads as part of the page.
   The band is light, so text on it is dark: use --text-on-band, never white.
   Emphasis comes from weight, rules and whitespace. All colour goes through
   the custom properties below so the dark-mode block at the end only has to
   override these — never hardcode a colour in a rule.
   ========================================================================== */

/* Nunito, self-hosted (variable, 400–800) so the page has no external
   dependency and no third-party request. Files in assets/fonts/. */
@font-face {
  font-family: "Nunito";
  font-style: normal;
  font-weight: 400 800;
  font-display: swap;
  src: url("../fonts/nunito-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193,
    U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Nunito";
  font-style: normal;
  font-weight: 400 800;
  font-display: swap;
  src: url("../fonts/nunito-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF,
    U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020,
    U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

:root {
  --paper:          #fbfdff;
  --paper-2:        #eef4fa;
  --band:           #cfe2f3;   /* nav + header + footer, straight from the figure */
  --band-line:      rgba(15, 36, 54, 0.22);   /* borders on the band */
  --band-line-hover:rgba(15, 36, 54, 0.55);
  --band-wash:      rgba(255, 255, 255, 0.55); /* button hover on the band */

  --rule:           #dde7f0;
  --rule-strong:    #adc0d2;

  --text:           #0f1a24;
  --text-2:         #4a5866;
  --text-3:         #66727f;
  --text-on-band:   #0f2436;
  --text-on-band-2: #3c5670;

  --link:           #1560a8;
  --link-hover:     #0e4680;

  --font-sans: "Nunito", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --max-width: 940px;
  --gutter: 24px;
  --measure: 70ch;
  --nav-h: 52px;

  font-size: 16px;
  color-scheme: light;
}

* { box-sizing: border-box; }

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.62;
  color: var(--text);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

a { color: var(--link); }
a:hover { color: var(--link-hover); }

sup { font-size: 0.68em; line-height: 0; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--band);
  color: var(--text-on-band);
  padding: 10px 16px;
  text-decoration: none;
}
.skip-link:focus { left: 8px; top: 8px; }

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

/* --------------------------------------------------------------------------
   Sticky nav
   -------------------------------------------------------------------------- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--band);
}

.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: var(--nav-h);
}

.site-nav .brand {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-on-band);
  text-decoration: none;
  white-space: nowrap;
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 24px;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.site-nav ul::-webkit-scrollbar { display: none; }

.site-nav a.nav-link {
  display: block;
  padding: 3px 0;
  border-bottom: 1px solid transparent;
  color: var(--text-on-band-2);
  text-decoration: none;
  font-size: 0.82rem;
  white-space: nowrap;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.site-nav a.nav-link:hover { color: var(--text-on-band); }

.site-nav a.nav-link.is-active {
  color: var(--text-on-band);
  border-bottom-color: var(--text-on-band);
}

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

.hero {
  background: var(--band);
  color: var(--text-on-band);
  padding: clamp(36px, 4vw, 52px) 0 clamp(28px, 3.5vw, 40px);
}

.hero h1 {
  font-weight: 700;
  font-size: clamp(1.5rem, 1.1rem + 1.5vw, 2.1rem);
  line-height: 1.2;
  letter-spacing: -0.012em;
  margin: 0 0 20px;
  max-width: 46ch;
  text-wrap: balance;
}

.hero .authors {
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0 0 8px;
  max-width: 82ch;
}

.hero .affiliations {
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--text-on-band-2);
  margin: 0 0 22px;
  max-width: 82ch;
}

/* --------------------------------------------------------------------------
   Links styled as buttons
   -------------------------------------------------------------------------- */

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 17px;
  border: 1px solid var(--rule-strong);
  color: var(--text);
  background: transparent;
  font-size: 0.86rem;
  font-weight: 500;
  text-decoration: none;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn:hover {
  border-color: var(--text);
  color: var(--text);
}

.btn svg {
  width: 15px;
  height: 15px;
  flex: none;
  opacity: 0.75;
}

.hero .btn {
  border-color: var(--band-line);
  color: var(--text-on-band);
}
.hero .btn:hover {
  background: var(--band-wash);
  border-color: var(--band-line-hover);
  color: var(--text-on-band);
}

.btn[aria-disabled="true"] {
  border-style: dashed;
  cursor: not-allowed;
}

/* --------------------------------------------------------------------------
   Sections
   -------------------------------------------------------------------------- */

section {
  scroll-margin-top: var(--nav-h);
  padding: clamp(40px, 5vw, 64px) 0;
}

section + section .container { border-top: 1px solid var(--rule); padding-top: clamp(40px, 5vw, 64px); }
section + section { padding-top: 0; }

.section-title {
  font-weight: 700;
  font-size: 1.4rem;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 20px;
}

section p { max-width: var(--measure); }

/* --------------------------------------------------------------------------
   Overview figure — sits directly under the header, above the abstract
   -------------------------------------------------------------------------- */

.section-figure { padding-bottom: 0; }

figure { margin: 0; }

/* The graphical abstract is on a white ground, so it needs a hairline to sit
   against the paper (and not float in dark mode). */
figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--rule);
}

/* --------------------------------------------------------------------------
   Highlights — the paper's contributions as plain bullets
   -------------------------------------------------------------------------- */

.highlights {
  margin: 0;
  padding-left: 1.15em;
  max-width: var(--measure);
}

.highlights li {
  margin-bottom: 10px;
  padding-left: 0.25em;
  font-size: 1rem;
  line-height: 1.62;
}

.highlights li:last-child { margin-bottom: 0; }

.highlights li::marker { color: var(--text-3); }

/* --------------------------------------------------------------------------
   Results table — booktabs: horizontal rules only, no fills, tabular figures
   -------------------------------------------------------------------------- */

.table-caption {
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--text-2);
  margin: 0 0 14px;
  max-width: 88ch;
}
.table-caption b { color: var(--text); font-weight: 600; }

.table-wrap { overflow-x: auto; }

table.results {
  width: 100%;
  min-width: 700px;
  border-collapse: collapse;
  font-size: 0.85rem;
  border-top: 1.25px solid var(--text);
}

table.results th,
table.results td {
  padding: 9px 8px;
  text-align: left;
  vertical-align: baseline;
}

table.results th:first-child,
table.results td:first-child { padding-left: 0; }
table.results th:last-child,
table.results td:last-child { padding-right: 0; }

table.results thead th {
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}

table.results thead th.group {
  text-align: center;
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-2);
  padding-bottom: 0;
}

/* \cmidrule: rule under the group label, stopping short of the cell edge */
table.results thead th.group > span {
  display: block;
  padding: 0 14px 7px;
  border-bottom: 1px solid var(--rule-strong);
}

table.results thead tr:last-child th {
  border-bottom: 1px solid var(--text);
  font-size: 0.78rem;
  padding-top: 11px;
  padding-bottom: 8px;
}

/* "Method" spans both header rows, so it needs the midrule applied directly. */
table.results thead th[rowspan] {
  vertical-align: bottom;
  border-bottom: 1px solid var(--text);
  padding-bottom: 8px;
}

table.results thead th .arrow {
  font-style: normal;
  color: var(--text-3);
  font-size: 0.85em;
}

table.results tbody th[scope="row"] {
  font-weight: 400;
  padding-right: 22px;
}

table.results tbody tr + tr th,
table.results tbody tr + tr td { border-top: 1px solid var(--rule); }

table.results .method {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

table.results .method-src {
  display: block;
  font-size: 0.73rem;
  line-height: 1.4;
  color: var(--text-3);
  margin-top: 1px;
}

table.results td.metric,
table.results th.metric {
  text-align: right;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

table.results td.metric {
  font-size: 0.9rem;
  color: var(--text-2);
}

table.results .sd {
  font-size: 0.8em;
  color: var(--text-3);
}

/* Best per metric — weight, not colour */
table.results td.best {
  font-weight: 700;
  color: var(--text);
}

table.results td.pending { color: var(--text-3); }

/* Reference block (expert analysts), separated by a midrule */
table.results tbody.tbody-reference tr:first-child th,
table.results tbody.tbody-reference tr:first-child td {
  border-top: 1px solid var(--text);
}

table.results tbody:last-of-type tr:last-child th,
table.results tbody:last-of-type tr:last-child td {
  border-bottom: 1.25px solid var(--text);
}

.table-note {
  margin-top: 14px;
  font-size: 0.79rem;
  line-height: 1.6;
  color: var(--text-2);
  max-width: 88ch;
}
.table-note b { color: var(--text); font-weight: 600; }

/* --------------------------------------------------------------------------
   Citation
   -------------------------------------------------------------------------- */

.citation-block {
  position: relative;
  max-width: 80ch;
}

pre.bibtex {
  margin: 0;
  padding: 22px 24px;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  color: var(--text);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  line-height: 1.65;
  tab-size: 2;
}

.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: var(--paper);
  color: var(--text-2);
  border: 1px solid var(--rule-strong);
  padding: 4px 11px;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.copy-btn:hover { color: var(--text); border-color: var(--text); }
.copy-btn.is-copied { color: var(--text); border-color: var(--text); }

/* --------------------------------------------------------------------------
   Contact
   -------------------------------------------------------------------------- */

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
  max-width: var(--measure);
}

.contact-list .role {
  display: block;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 7px;
}

.contact-list .name {
  display: block;
  font-size: 1.02rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.contact-list a {
  font-size: 0.88rem;
  text-decoration: none;
  border-bottom: 1px solid var(--rule-strong);
}
.contact-list a:hover { border-color: currentColor; }

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

footer {
  margin-top: clamp(40px, 5vw, 64px);
  background: var(--band);
  color: var(--text-on-band-2);
  padding: 32px 0;
  font-size: 0.78rem;
}

footer .container {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 28px;
}

footer p { margin: 0; }

footer a {
  color: var(--text-on-band-2);
  text-decoration: none;
  border-bottom: 1px solid var(--band-line);
}
footer a:hover { color: var(--text-on-band); border-color: currentColor; }

/* --------------------------------------------------------------------------
   Dark mode — override the tokens only
   -------------------------------------------------------------------------- */

@media (prefers-color-scheme: dark) {
  :root {
    --paper:          #0c1219;
    --paper-2:        #141d28;
    /* The band inverts in dark mode: a deep tint of the same hue, with light
       text on it. --band-line/--band-wash flip from dark-on-light to
       light-on-dark to match. */
    --band:           #16283a;
    --band-line:      rgba(207, 226, 243, 0.24);
    --band-line-hover:rgba(207, 226, 243, 0.6);
    --band-wash:      rgba(207, 226, 243, 0.1);

    --rule:           #223041;
    --rule-strong:    #3a4b60;

    --text:           #e9eef5;
    --text-2:         #97a5b8;
    --text-3:         #758497;
    --text-on-band:   #e4eef8;
    --text-on-band-2: #a8c2dc;

    --link:           #7fb4ea;
    --link-hover:     #a5cbf2;

    color-scheme: dark;
  }

  footer { border-top: 1px solid var(--rule); }
}