/* ==============================================================
   Site styles. To change the colours, edit the values in the
   :root blocks below. The first block is light mode, the
   second is dark mode.
   ============================================================== */

:root {
  --navy: #0e2a4b;
  --navy-line: #24426a;
  --on-navy: #ffffff;
  --on-navy-muted: #b8c6da;

  --bg: #ffffff;
  --bg-alt: #f5f8fc;
  --surface: #ffffff;
  --ink: #0f1d33;
  --muted: #4d5b70;
  --line: #e0e6ee;

  --accent: #1b5cb3;
  --accent-hover: #144a94;
  --accent-ink: #ffffff;
  --accent-soft: #e8f0fa;
  --warm: #c0623a;

  --hero-from: #f4f8fd;
  --hero-to: #e3edf9;
  --shadow: 0 1px 2px rgba(15, 29, 51, 0.05), 0 6px 18px rgba(15, 29, 51, 0.06);

  --serif: Charter, "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --wrap: 1120px;
  --measure: 700px;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --navy: #091424;
    --navy-line: #1d2c42;
    --on-navy: #eef2f8;
    --on-navy-muted: #9fb0c6;

    --bg: #0e1622;
    --bg-alt: #121c2a;
    --surface: #162233;
    --ink: #e7edf5;
    --muted: #a3b0c2;
    --line: #26344a;

    --accent: #8cb8f0;
    --accent-hover: #b2cff6;
    --accent-ink: #0b1626;
    --accent-soft: #1a2c44;
    --warm: #eba27f;

    --hero-from: #111b29;
    --hero-to: #15253b;
    --shadow: none;
  }
}

/* ---------- Base ---------- */

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.6;
}

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
}

a { color: var(--accent); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { color: var(--accent-hover); }
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

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

.icon { width: 1.15em; height: 1.15em; flex: none; vertical-align: -0.2em; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 16px; }
@media (min-width: 640px) { .wrap { padding: 0 32px; } }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap;
}

.skip-link { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; z-index: 10; }
.skip-link:focus { left: 8px; }

.accent-bar {
  display: block;
  width: 52px;
  height: 4px;
  border-radius: 2px;
  background: var(--accent);
  margin-bottom: 18px;
}

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

.site-header { background: var(--navy); color: var(--on-navy); }

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 4px 28px;
  min-height: 60px;
  padding-top: 10px;
  padding-bottom: 10px;
}

.brand {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--on-navy);
  text-decoration: none;
  letter-spacing: 0.005em;
}
.brand:hover { color: var(--on-navy); }

.site-nav { display: flex; flex-wrap: wrap; gap: 2px 26px; font-size: 1rem; }
@media (max-width: 480px) { .site-nav { gap: 2px 18px; font-size: 0.95rem; } }

.site-nav a {
  color: var(--on-navy);
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  opacity: 0.88;
}
.site-nav a:hover { opacity: 1; color: var(--on-navy); }
.site-nav a[aria-current="page"] { opacity: 1; border-bottom-color: var(--on-navy); }

/* ---------- Buttons ---------- */

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }

.button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border: 1.5px solid var(--accent);
  border-radius: 6px;
  background: var(--surface);
  color: var(--accent);
  font-family: var(--serif);
  font-size: 0.98rem;
  font-weight: 600;
  text-decoration: none;
}
.button:hover { background: var(--accent-soft); color: var(--accent-hover); }

.button-primary { background: var(--accent); color: var(--accent-ink); }
.button-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--accent-ink); }

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

.hero {
  position: relative;
  overflow: hidden;
  padding: 40px 0 76px;
  background: linear-gradient(105deg, var(--hero-from) 0%, var(--hero-from) 45%, var(--hero-to) 100%);
  border-bottom: 1px solid var(--line);
}

/* A faint stepped curve on the right, in place of a background photo */
.hero-mark {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  width: 100%; height: 56px;
  pointer-events: none;
}
.hero-mark path { fill: none; stroke: var(--accent); stroke-width: 2; stroke-opacity: 0.22; vector-effect: non-scaling-stroke; }
.hero-mark path.faint { stroke-opacity: 0.12; }

.hero-grid { position: relative; display: grid; gap: 28px; }

@media (min-width: 820px) {
  .hero { padding: 56px 0 84px; }
  .hero-grid { grid-template-columns: 250px 1fr; gap: 56px; align-items: center; }
}

.hero-side { display: flex; flex-direction: column; align-items: flex-start; gap: 16px; }
@media (min-width: 820px) { .hero-side { align-items: center; } }

.portrait {
  width: 150px;
  aspect-ratio: 230 / 250;
  border-radius: 12px;
  overflow: hidden;
  background: var(--accent-soft);
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
}
@media (min-width: 820px) { .portrait { width: 230px; } }

.portrait img { width: 100%; height: 100%; object-fit: cover; display: block; }

.monogram {
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  color: var(--accent);
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}
@media (min-width: 820px) { .monogram { font-size: 3.6rem; } }

.hero-links { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }

.round-link, .pill-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 38px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow);
  text-decoration: none;
}
.round-link { width: 38px; border-radius: 50%; }
.pill-link { padding: 0 14px; border-radius: 19px; font-family: var(--sans); font-size: 0.85rem; font-weight: 600; }
.round-link:hover, .pill-link:hover { border-color: var(--accent); color: var(--accent); }

.hero h1 { margin: 0 0 8px; font-size: clamp(2.2rem, 5.4vw, 3.4rem); letter-spacing: -0.01em; color: var(--ink); }

.subtitle { margin: 0 0 16px; font-size: clamp(1.1rem, 2.2vw, 1.35rem); font-weight: 600; color: var(--accent); }

.bio { max-width: 40em; font-size: 1.1rem; line-height: 1.6; }
.bio p { margin: 0; }

/* ---------- Sections and cards ---------- */

.section { padding: 48px 0 52px; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-alt + .section, .section + .section-alt { border-top-color: var(--line); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 8px 24px;
  margin-bottom: 24px;
}

.section-head h2 { margin: 0; font-size: clamp(1.5rem, 3vw, 1.85rem); }
.section-head h2::after {
  content: "";
  display: block;
  width: 44px;
  height: 3px;
  margin-top: 10px;
  border-radius: 2px;
  background: var(--accent);
}

.more { display: inline-flex; align-items: center; gap: 6px; font-size: 0.95rem; text-decoration: none; margin-bottom: 4px; }
.more:hover { text-decoration: underline; }

.grid { display: grid; gap: 18px; }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr)); }

@media (max-width: 420px) {
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card h3 { margin: 0 0 8px; font-size: 1.08rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.97rem; line-height: 1.55; }

.card-icon { display: inline-flex; color: var(--accent); }
.card-icon .icon { width: 34px; height: 34px; }

.interest { padding: 22px 22px 24px; }
.interest .card-icon { margin-bottom: 14px; }

/* Project cards: picture on the left, text on the right */
.project { display: grid; grid-template-columns: 96px 1fr; gap: 16px; padding: 14px; }

.project-picture {
  align-self: start;
  height: 120px;
  border-radius: 8px;
  background: var(--accent-soft);
  display: grid;
  place-items: center;
  padding: 6px;
}

.picture { width: 100%; max-width: 96px; height: auto; }
.picture text { font-family: var(--sans); font-size: 11px; font-weight: 600; fill: var(--ink); }
.p-axis { stroke: var(--muted); stroke-width: 1.5; stroke-opacity: 0.5; fill: none; }
.p-line { stroke: var(--accent); stroke-width: 3; fill: none; stroke-linecap: round; }
.p-warm-line { stroke: var(--warm); stroke-width: 3; fill: none; stroke-linecap: round; }
.p-dot, .p-fill { fill: var(--accent); }
.p-dot-warm, .p-warm { fill: var(--warm); }
.p-soft { fill: var(--accent); opacity: 0.22; }

.project-body h3 { margin-top: 2px; }

.tags { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; margin: 12px 0 0; padding: 0; }
.tags li {
  font-family: var(--sans);
  font-size: 0.74rem;
  padding: 3px 9px;
  border-radius: 5px;
  background: var(--accent-soft);
  color: var(--accent);
}

/* Recent outputs list */
.outputs { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }

.output {
  display: grid;
  grid-template-columns: 76px 1fr 28px;
  gap: 18px;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 700px) { .output { grid-template-columns: 96px 1fr 32px; gap: 28px; } }

.year-pill {
  justify-self: start;
  padding: 6px 0;
  width: 100%;
  text-align: center;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--ink);
  font-weight: 600;
}

.output h3 { margin: 0 0 4px; font-size: 1.02rem; line-height: 1.35; }
.output h3 a { color: var(--ink); text-decoration: none; }
.output h3 a:hover { color: var(--accent); text-decoration: underline; }
.output-authors, .output-source { margin: 0; font-size: 0.93rem; color: var(--muted); }
.output-authors strong { color: var(--ink); }
.output-source cite { font-style: italic; }
.output-arrow { color: var(--accent); justify-self: end; }

/* Track record cards */
.stat { display: flex; gap: 16px; align-items: flex-start; padding: 20px 22px; }
.stat .card-icon { margin-top: 6px; }
.stat-number { margin: 0 !important; font-size: 1.9rem !important; font-weight: 700; color: var(--ink) !important; line-height: 1.15 !important; }
.stat-label { margin: 2px 0 0 !important; font-weight: 700; color: var(--ink) !important; }
.stat-detail { font-size: 0.9rem !important; }

/* ---------- Inner page heading ---------- */

.page-head {
  padding: 44px 0 30px;
  background: linear-gradient(105deg, var(--hero-from) 0%, var(--hero-to) 100%);
  border-bottom: 1px solid var(--line);
}

.page-head h1 { margin: 0 0 10px; font-size: clamp(2rem, 4.6vw, 2.7rem); }
.page-head .lead { margin: 0; max-width: 44em; color: var(--muted); font-size: 1.08rem; }
.page-head .prose { padding: 0; }
.page-head .prose:empty { display: none; }

/* ---------- Prose (text from the .md files) ---------- */

.prose { padding-top: 8px; padding-bottom: 56px; }
.prose > * { max-width: var(--measure); }

.prose h2 {
  margin: 44px 0 14px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 1.5rem;
}
.prose > h2:first-child { margin-top: 36px; padding-top: 0; border-top: 0; }
.prose > p:first-child { margin-top: 32px; }
.prose h3 { margin: 28px 0 6px; font-size: 1.15rem; }
.prose h2 + h3 { margin-top: 16px; }
.prose p, .prose ul, .prose ol { margin: 0 0 16px; }
.prose ul { padding-left: 1.2em; }
.prose li { margin-bottom: 8px; }
.prose li::marker { color: var(--accent); }

/* Opening paragraph of the Research page */
.prose.intro { padding-bottom: 0; }
.prose.intro p { font-size: 1.12rem; line-height: 1.7; }
.section-tight { padding-top: 20px; }

/* ---------- Outputs page ---------- */

.pub-tools { padding: 18px 0 12px; background: var(--bg); border-bottom: 1px solid var(--line); }
@media (min-width: 820px) { .pub-tools { position: sticky; top: 0; z-index: 2; padding-top: 22px; } }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }

.chip {
  font-family: var(--sans);
  font-size: 0.86rem;
  padding: 6px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
}
.chip:hover { border-color: var(--accent); }
.chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.chip-count { opacity: 0.7; margin-left: 4px; font-variant-numeric: tabular-nums; }

.pub-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 20px; margin-top: 12px; }
.search { flex: 1 1 260px; }
.search input {
  width: 100%;
  font: inherit;
  font-family: var(--sans);
  font-size: 0.95rem;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
}
.check { font-family: var(--sans); font-size: 0.92rem; display: inline-flex; align-items: center; gap: 8px; cursor: pointer; }
.check input { width: 17px; height: 17px; accent-color: var(--accent); }
.pub-count { margin: 10px 0 0; font-family: var(--sans); font-size: 0.85rem; color: var(--muted); }

.pub-list { max-width: 860px; padding-bottom: 20px; }

.pub-group-title {
  display: inline-block;
  margin: 34px 0 6px;
  padding: 4px 14px;
  border-radius: 6px;
  background: var(--accent-soft);
  font-size: 0.95rem;
  font-weight: 700;
}

.pub { padding: 16px 0 18px; border-bottom: 1px solid var(--line); }
.pub-title { margin: 0 0 6px; font-size: 1.1rem; line-height: 1.35; }
.pub-title a { color: var(--ink); text-decoration: none; }
.pub-title a:hover { color: var(--accent); text-decoration: underline; }
.pub-authors { margin: 0 0 4px; font-size: 0.95rem; color: var(--muted); }
.pub-authors strong { color: var(--ink); }
.pub-source { margin: 0; font-size: 0.95rem; }
.pub-source cite { font-style: italic; }
.doi { margin-left: 6px; font-family: var(--sans); font-size: 0.8rem; overflow-wrap: anywhere; }

.no-results { margin: 28px 0; color: var(--muted); }
.more-links { margin: 28px 0 56px; color: var(--muted); font-size: 0.95rem; }

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

.site-footer { background: var(--navy); color: var(--on-navy-muted); font-size: 0.95rem; }
.site-footer a { color: var(--on-navy); }

.footer-grid {
  display: grid;
  gap: 20px 40px;
  padding-top: 34px;
  padding-bottom: 26px;
}
@media (min-width: 820px) {
  .footer-grid { grid-template-columns: 1.3fr 1.2fr 1fr auto; align-items: start; }
}

.footer-grid p { margin: 0 0 2px; }
.footer-name { color: var(--on-navy); font-size: 1.2rem; font-weight: 700; }

.footer-item { display: flex; gap: 10px; align-items: flex-start; }
.footer-item .icon { margin-top: 3px; color: var(--on-navy); }

.footer-links { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px 18px; }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px 20px;
  padding-top: 16px;
  padding-bottom: 22px;
  border-top: 1px solid var(--navy-line);
  font-size: 0.85rem;
}
.footer-bottom p { margin: 0; }

@media print {
  .site-header, .site-footer, .pub-tools, .hero-mark, .actions { display: none; }
  body { background: #fff; color: #000; }
}


/* ---------- Enquiry form (Contact page) ---------- */

.enquiry { max-width: var(--measure); margin-top: 8px; font-family: var(--sans); }
.enquiry .field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 18px; }
.enquiry .field-row { display: grid; grid-template-columns: 1fr; gap: 0 20px; }
@media (min-width: 640px) { .enquiry .field-row { grid-template-columns: 1fr 1fr; } }
.enquiry label { font-size: 0.95rem; font-weight: 600; color: var(--ink); }
.enquiry .optional { font-weight: 400; color: var(--muted); font-size: 0.85rem; margin-left: 4px; }
.enquiry .hint { margin: 0; font-size: 0.88rem; color: var(--muted); }
.enquiry input,
.enquiry select,
.enquiry textarea {
  width: 100%;
  font: inherit;
  font-size: 1rem;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
}
.enquiry textarea { resize: vertical; min-height: 9rem; line-height: 1.5; }
.enquiry input:focus-visible,
.enquiry select:focus-visible,
.enquiry textarea:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.enquiry [aria-invalid="true"] { border-color: var(--warm); }
.form-privacy { font-size: 0.88rem; color: var(--muted); margin: 4px 0 18px; }
.form-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px; }
.form-actions .button { font-size: 1rem; cursor: pointer; }
.form-actions .button:disabled { opacity: 0.6; cursor: progress; }
.form-status { margin: 0; font-size: 0.95rem; }
.form-status.is-ok { color: var(--accent); font-weight: 600; }
.form-status.is-error { color: var(--warm); font-weight: 600; }