/* MKG 2026 — design system
   Palette + type from the INFINITY media kit (see sketch.md > Design system). */

@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url('../fonts/roboto-regular.woff2') format('woff2');
}
@font-face {
  font-family: 'Roboto';
  font-style: italic;
  font-weight: 400 700;
  font-display: swap;
  src: url('../fonts/roboto-italic.woff2') format('woff2');
}
@font-face {
  font-family: 'Instrument Serif';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/instrument-serif-regular.woff2') format('woff2');
}
@font-face {
  font-family: 'Instrument Serif';
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/instrument-serif-italic.woff2') format('woff2');
}

:root {
  --ink: #282828;
  --paper: #f0f0f0;
  --accent-yellow: #ffdb63;
  --accent-purple: #b58cd6;
  --accent-green: #6eba8c;
  --accent-pink: #eb6e8c;

  /* darkened, AA-safe variants for use as small text on a light surface */
  --accent-purple-text: #6d3fae;
  --accent-green-text: #2a7350;
  --accent-pink-text: #c02f57;

  /* working-group -> accent colour mapping (kept consistent site-wide) */
  --wg-a: var(--accent-purple);
  --wg-a-text: var(--accent-purple-text);
  --wg-b: var(--accent-green);
  --wg-b-text: var(--accent-green-text);
  --wg-c: var(--accent-pink);
  --wg-c-text: var(--accent-pink-text);

  --font-body: 'Roboto', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-display: 'Instrument Serif', Georgia, 'Times New Roman', serif;
}

[data-bs-theme='light'] {
  --bs-body-bg: var(--paper);
  --bs-body-color: var(--ink);
  --bs-border-color: #d8d8d8;
  --surface-raised: #ffffff;
  --surface-sunken: #e4e4e4;
  --mesh-alpha: 0.3;
}

[data-bs-theme='dark'] {
  --bs-body-bg: var(--ink);
  --bs-body-color: var(--paper);
  --bs-border-color: #444444;
  --surface-raised: #333333;
  --surface-sunken: #1e1e1e;
  --mesh-alpha: 0.5;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
}

h1, h2, h3, h4,
.font-display {
  font-family: var(--font-display);
  font-weight: 400;
}

.lede,
.font-serif-italic {
  font-family: var(--font-display);
  font-style: italic;
}

/* anchors land below the sticky nav */
section[id] {
  scroll-margin-top: 4.5rem;
}

.page-section {
  padding-top: 3rem;
  padding-bottom: 3rem;
}

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

/* ---- Side dot navigation (home page only) ---- */
.side-dots {
  position: fixed;
  top: 50%;
  right: 1.75rem;
  transform: translateY(-50%);
  z-index: 1030;
  gap: 1.1rem;
}
.side-dots a {
  position: relative;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bs-border-color);
  transition: background 0.2s, transform 0.2s;
}
.side-dots a:hover,
.side-dots a.active {
  background: var(--accent-yellow);
  transform: scale(1.35);
}
.side-dots .dot-label {
  position: absolute;
  right: 1.4rem;
  top: 50%;
  transform: translateY(-50%);
  white-space: nowrap;
  font-size: 0.75rem;
  color: var(--bs-body-color);
  background: var(--surface-raised);
  border: 1px solid var(--bs-border-color);
  padding: 0.15rem 0.65rem;
  border-radius: 999px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s;
}
.side-dots a:hover .dot-label {
  opacity: 1;
}

/* ---- Back-to-top button ---- */
.back-to-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 1030;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  border: 1px solid var(--bs-border-color);
  background: var(--accent-yellow);
  color: var(--ink);
  font-size: 1.25rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
}
.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: #ffcf3d;
}

/* ---- Navbar ---- */
.navbar-mkg {
  background: var(--surface-raised);
  border-bottom: 1px solid var(--bs-border-color);
}
.navbar-mkg .navbar-brand {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--bs-body-color);
}
.navbar-mkg .nav-link {
  color: var(--bs-body-color);
  opacity: 0.8;
}
.navbar-mkg .nav-link:hover,
.navbar-mkg .nav-link.active {
  opacity: 1;
  text-decoration: underline;
  text-decoration-color: var(--accent-yellow);
  text-decoration-thickness: 3px;
  text-underline-offset: 4px;
}
.navbar-mkg .dropdown-menu {
  background: var(--surface-raised);
  border-color: var(--bs-border-color);
}
.navbar-mkg .dropdown-item {
  color: var(--bs-body-color);
}
.navbar-mkg .dropdown-item:hover,
.navbar-mkg .dropdown-item:focus {
  background: var(--surface-sunken);
  color: var(--bs-body-color);
}

/* ---- Theme toggle button ---- */
.theme-toggle {
  border: 1px solid var(--bs-border-color);
  background: transparent;
  color: var(--bs-body-color);
  border-radius: 999px;
  width: 2.5rem;
  height: 2.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}
.theme-toggle:hover {
  border-color: var(--accent-yellow);
}
[data-bs-theme='dark'] .theme-toggle .icon-sun { display: inline; }
[data-bs-theme='dark'] .theme-toggle .icon-moon { display: none; }
[data-bs-theme='light'] .theme-toggle .icon-sun { display: none; }
[data-bs-theme='light'] .theme-toggle .icon-moon { display: inline; }

/* ---- Hero ---- */
.hero {
  border-bottom: 1px solid var(--bs-border-color);
}
.hero-visual {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  min-height: min(78vh, 44rem);
  display: flex;
  align-items: center;
}
.hero__mesh {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  display: block;
  -webkit-mask-image: radial-gradient(115% 90% at 66% 58%, #000 0%, #000 30%, transparent 74%);
  mask-image: radial-gradient(115% 90% at 66% 58%, #000 0%, #000 30%, transparent 74%);
}
.hero__scrim {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(100deg,
    var(--bs-body-bg) 0%,
    color-mix(in srgb, var(--bs-body-bg) 80%, transparent) 36%,
    transparent 66%);
}
.hero__content {
  position: relative;
  z-index: 2;
  width: 100%;
}
@media (max-width: 767.98px) {
  .hero-visual {
    min-height: 0;
  }
  .hero__mesh,
  .hero__scrim {
    display: none;
  }
}
.hero--compact .hero-visual {
  min-height: min(40vh, 22rem);
}
.hero .eyebrow {
  color: var(--ink);
  background: var(--accent-yellow);
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.hero h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  line-height: 1.1;
}
.hero .format-note {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.25rem;
}

/* ---- Cards ---- */
.card-mkg {
  background: var(--surface-raised);
  border: 1px solid var(--bs-border-color);
  border-radius: 0.5rem;
  height: 100%;
}
.card-mkg .card-body {
  padding: 1.5rem;
}
@media (max-width: 767.98px) {
  .card-mkg .card-body {
    padding: 1.1rem;
  }
}

/* rule under section headings, yellow accent */
.section-title {
  position: relative;
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}
.section-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 3.5rem;
  height: 4px;
  background: var(--accent-yellow);
  border-radius: 2px;
}

/* ---- Working-group colour badges (a/b/c) ---- */
.wg-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 700;
  font-size: 0.85rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: var(--surface-sunken);
}
.wg-badge::before {
  content: '';
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  display: inline-block;
}
.wg-a { color: var(--wg-a-text); }
.wg-a::before { background: var(--wg-a); }
.wg-b { color: var(--wg-b-text); }
.wg-b::before { background: var(--wg-b); }
.wg-c { color: var(--wg-c-text); }
.wg-c::before { background: var(--wg-c); }

.border-wg-a { border-left: 4px solid var(--wg-a) !important; }
.border-wg-b { border-left: 4px solid var(--wg-b) !important; }
.border-wg-c { border-left: 4px solid var(--wg-c) !important; }

/* ---- Buttons ---- */
.btn-mkg-primary {
  background: var(--accent-yellow);
  color: var(--ink);
  border: 1px solid var(--accent-yellow);
  font-weight: 700;
}
.btn-mkg-primary:hover {
  background: #ffcf3d;
  color: var(--ink);
}
.btn-mkg-outline {
  background: transparent;
  color: var(--bs-body-color);
  border: 1px solid var(--bs-body-color);
}
.btn-mkg-outline:hover {
  border-color: var(--accent-yellow);
  color: var(--bs-body-color);
}

/* ---- Track tabs (Research questions) ---- */
.nav-pills-mkg {
  display: inline-flex;
}
.nav-pills-mkg .nav-link {
  color: var(--bs-body-color);
  background: var(--surface-sunken);
  border-radius: 999px;
  font-weight: 700;
  padding: 0.5rem 1.15rem;
  border: 1px solid transparent;
}
.nav-pills-mkg .nav-link:hover {
  border-color: var(--bs-border-color);
}
.nav-pills-mkg .nav-link.active {
  background: var(--accent-yellow);
  color: var(--ink);
}

/* ---- Read-more collapse (Motivation) ---- */
.read-more-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.read-more-toggle .caret {
  display: inline-block;
  transition: transform 0.2s;
}
.read-more-toggle[aria-expanded='true'] .caret {
  transform: rotate(180deg);
}

/* ---- Chairs ---- */
.chair-card .chair-name {
  font-family: var(--font-display);
  font-size: 1.4rem;
}

.accordion-mkg .accordion-item {
  background: var(--surface-raised);
  border: 1px solid var(--bs-border-color);
  border-radius: 0.5rem !important;
  margin-bottom: 0.75rem;
  overflow: hidden;
}
.accordion-mkg .accordion-item:last-child {
  margin-bottom: 0;
}
.accordion-mkg .accordion-button {
  background: var(--surface-raised);
  color: var(--bs-body-color);
  font-family: var(--font-body);
  box-shadow: none;
  flex-wrap: wrap;
  row-gap: 0.25rem;
  column-gap: 0.9rem;
}
.accordion-mkg .accordion-button:not(.collapsed) {
  background: var(--surface-sunken);
  color: var(--bs-body-color);
  box-shadow: none;
}
.accordion-mkg .accordion-button:focus {
  box-shadow: 0 0 0 3px rgba(255, 219, 99, 0.4);
}
.accordion-mkg .chair-name-compact {
  font-family: var(--font-display);
  font-size: 1.2rem;
  white-space: nowrap;
}
.accordion-mkg .chair-affil-compact {
  font-size: 0.85rem;
  color: var(--bs-body-color);
  opacity: 0.7;
  font-weight: 400;
}
.accordion-mkg .accordion-body {
  background: var(--surface-raised);
  padding-top: 0.75rem;
}
.chair-photo {
  display: block;
  width: 120px;
  height: 120px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--bs-border-color);
}

/* ---- EoI form ---- */
.form-tier {
  border-left: 3px solid var(--accent-yellow);
  padding-left: 1.25rem;
  margin-top: 2rem;
}
.word-counter,
.field-counter {
  font-size: 0.85rem;
  color: var(--bs-body-color);
  opacity: 0.75;
}
.field-counter.over-limit {
  color: var(--accent-pink-text);
  opacity: 1;
  font-weight: 700;
}
.consent-block {
  background: var(--surface-sunken);
  border-radius: 0.5rem;
  padding: 1.25rem;
}
.notice-block {
  background: var(--surface-sunken);
  border-left: 4px solid var(--accent-yellow);
  padding: 1rem 1.25rem;
  border-radius: 0.25rem;
}

/* ---- Footer ---- */
.site-footer {
  background: var(--surface-sunken);
  border-top: 1px solid var(--bs-border-color);
}
.footer-logos {
  display: flex;
  flex-direction: column;
}
.footer-logo-img {
  width: 150px;
  height: auto;
  max-width: 100%;
  display: block;
}
.eu-claim-img {
  width: 190px;
  height: auto;
  max-width: 100%;
  display: block;
}
.eu-ack p {
  font-size: 0.78rem;
  opacity: 0.8;
  max-width: 50rem;
}

/* ---- TBD / provisional badges ---- */
.badge-tbd {
  background: var(--surface-sunken);
  border: 1px dashed var(--bs-border-color);
  color: var(--bs-body-color);
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
}