/* ==========================================================================
   NEDC26 — Reusable primitives and components
   Depends on nedc-tokens.css. Selectors are kept to a single class wherever
   possible so the cascade stays predictable across pages.
   ========================================================================== */

/* --- 1. Base ------------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }

html {
  color-scheme: light dark;
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem; /* clears the sticky header on anchor jumps */
}
:root[data-theme="light"] { color-scheme: light; }
:root[data-theme="dark"]  { color-scheme: dark; }

[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.58;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: 118%;
  letter-spacing: var(--track-tight);
  line-height: 1.02;
  text-wrap: balance;
  margin: 0;
}
p { margin: 0; }
a { color: inherit; }

img { display: block; max-width: 100%; }

:where(a, button, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: var(--r-flat);
}

/* --- 2. Layout primitives ----------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.wrap--tight { max-width: 940px; }

.section { padding-block: clamp(3.5rem, 7vw, var(--s10)); }
.section--sunk { background: var(--surface-sunk); }
/* For a section whose first child is a sticky bar, which needs to sit close
   to the page header rather than float in space. */
.section--flush { padding-top: var(--s5); }
.section--slab { background: var(--slab); color: var(--text-on-slab); }

.stack   { display: grid; gap: var(--s5); align-content: start; }
.stack-s { display: grid; gap: var(--s3); align-content: start; }
.stack-l { display: grid; gap: var(--s7); align-content: start; }

/* --- 3. Type roles ------------------------------------------------------ */
.util {
  font-family: var(--font-util);
  font-size: var(--step--1);
  font-weight: 600;
  font-stretch: 100%;
  letter-spacing: var(--track-util);
  text-transform: uppercase;
  line-height: 1.3;
}
.num { font-variant-numeric: tabular-nums; }

/* Same size and tracking as .util, but keeps the writer's own capitalisation.
   Brand names such as LinkedIn are wrong in all caps. */
.label {
  font-family: var(--font-util);
  font-size: var(--step--1);
  font-weight: 600;
  font-stretch: 100%;
  letter-spacing: .01em;
  line-height: 1.4;
}

.h-xl { font-size: var(--step-5); font-stretch: 122%; font-weight: 800; }
.h-l  { font-size: var(--step-4); }
.h-m  { font-size: var(--step-3); }
.h-s  { font-size: var(--step-2); font-stretch: 112%; font-weight: 700; }

.prose { max-width: var(--measure); }
.prose p + p { margin-top: .9em; }
.lede { font-size: var(--step-1); line-height: 1.55; color: var(--text-soft); }

/* Gradient-filled type. The identity gradient appears here and in .rule,
   never as a section background. */
.grad {
  background-image: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.section--slab .grad, .slab-scope .grad { background-image: var(--grad-lift); }

/* --- 4. Rules ----------------------------------------------------------- */
.rule { height: 2px; border: 0; margin: 0; background: var(--grad); }
.rule--hair { height: 1px; background: var(--line); }

/* --- 5. Buttons --------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5em;
  padding: .78em 1.5em;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-family: var(--font-util);
  font-size: var(--step--1);
  font-weight: 700;
  letter-spacing: .07em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary { background: var(--accent); color: var(--on-accent); }
.btn--primary:hover { background: var(--accent-ink); }

.btn--outline { border-color: var(--line-strong); color: var(--text); background: transparent; }
.btn--outline:hover { border-color: var(--accent); color: var(--accent); }

.btn--on-slab { border-color: var(--line-on-slab); color: var(--text-on-slab); background: transparent; }
.btn--on-slab:hover { border-color: var(--text-on-slab); background: rgba(255,255,255,.07); }

/* For the hero and page header band, which changes with the theme. */
.btn--band { border-color: var(--band-line); color: var(--band-text); background: transparent; }
.btn--band:hover { border-color: var(--band-text); background: color-mix(in srgb, var(--band-text) 8%, transparent); }

.btn--sm { padding: .58em 1.15em; font-size: var(--step--2); }

/* Text link with a gradient underline that grows on hover. */
.link {
  text-decoration: none;
  background-image: var(--grad);
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 100% 1px;
  padding-bottom: 2px;
  transition: background-size var(--dur) var(--ease);
}
.link:hover { background-size: 100% 2px; }

/* --- 6. Facts banner --------------------------------------------------- */
/* Filled to match the hero, with a vertical rule between items. The rules are
   borders rather than grid gaps, so they render at a consistent weight, and
   nth-child clears the first item of each row at both column counts. */
.facts { display: grid; gap: var(--s5); }
@media (min-width: 640px)  { .facts { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .facts { grid-template-columns: repeat(4, 1fr); } }

.fact { display: grid; gap: .4rem; align-content: start; }

@media (min-width: 640px) {
  .fact { border-left: 1px solid var(--band-line); padding-left: var(--s5); }
  .fact:nth-child(2n + 1) { border-left: 0; padding-left: 0; }
}
@media (min-width: 1000px) {
  .fact:nth-child(2n + 1) { border-left: 1px solid var(--band-line); padding-left: var(--s5); }
  .fact:nth-child(4n + 1) { border-left: 0; padding-left: 0; }
}

.fact__k { color: var(--band-mute); }
.fact__v { font-family: var(--font-display); font-weight: 600; font-stretch: 108%;
           font-size: var(--step-1); line-height: 1.3; color: var(--band-text); }

/* --- 7. Session index --------------------------------------------------- */
/* Two columns: the kind of session, then what it is. The kind column is
   information, not decoration, so evening events read differently. */
.sessions { display: grid; margin: 0; padding: 0; list-style: none; }
.session {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr);
  gap: var(--s4);
  padding-block: .7rem;
  border-top: 1px solid var(--line);
  align-items: baseline;
}
.session:last-child { border-bottom: 1px solid var(--line); }
.session__kind { color: var(--text-mute); padding-top: .18rem; }
.session__name { font-size: var(--step-0); line-height: 1.4; }
.session--evening .session__kind { color: var(--accent); }
.session--evening .session__name { font-weight: 500; }
@media (max-width: 520px) {
  .session { grid-template-columns: 1fr; gap: .2rem; }
}

/* --- 8. Program spine --------------------------------------------------- */
.spine { display: grid; }
.day { display: grid; grid-template-columns: 4.5rem minmax(0, 1fr); gap: var(--s5); }
@media (max-width: 700px) { .day { grid-template-columns: 3rem minmax(0,1fr); gap: var(--s4); } }

.day__rail { display: grid; grid-template-rows: auto 1fr; justify-items: center; gap: .6rem; }
.day__date {
  font-family: var(--font-display);
  font-stretch: 120%;
  font-weight: 800;
  font-size: var(--step-3);
  line-height: 1;
  letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
  background-image: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.day__line { width: 1px; background: var(--line-strong); justify-self: center; }
.day--optional .day__line {
  background: repeating-linear-gradient(to bottom, var(--line-strong) 0 5px, transparent 5px 11px);
}
.day__body { display: grid; gap: var(--s5); padding-bottom: var(--s8); }
@media (min-width: 900px) {
  .day__body { grid-template-columns: minmax(0,1fr) minmax(280px, 380px); column-gap: var(--s7); align-items: start; }
  .day__text  { grid-column: 1; grid-row: 1; }
  .day__media { grid-column: 2; grid-row: 1; }
  .day__index { grid-column: 1 / -1; grid-row: 2; }
}
.day__media img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: var(--r-flat); }
.day__note {
  font-family: var(--font-util); font-size: var(--step--1); font-weight: 600;
  letter-spacing: .06em; text-transform: uppercase; color: var(--accent-quiet);
}

/* --- 9. Gallery --------------------------------------------------------- */
.gallery { display: grid; gap: 10px; grid-template-columns: repeat(2, 1fr); }
@media (min-width: 860px) { .gallery { grid-template-columns: repeat(3, 1fr); } }
.gallery img {
  width: 100%; aspect-ratio: 4 / 3; object-fit: cover;
  border-radius: var(--r-flat);
  filter: saturate(.94);
  transition: filter var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.gallery figure { margin: 0; overflow: hidden; border-radius: var(--r-flat); }
.gallery figure:hover img { filter: saturate(1.05); transform: scale(1.02); }

/* --- 10. Logo sheet ----------------------------------------------------- */
/* One white sheet carrying every logo, rather than a bordered box per logo.
   Stays white in both themes: the supplied artwork is drawn for light grounds
   and would lose its edges on ink. */
.logo-sheet {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--r-flat);
  padding: clamp(var(--s5), 3.5vw, var(--s8)) clamp(var(--s4), 3vw, var(--s7));
}
:root[data-theme="dark"] .logo-sheet,
.logo-sheet { box-shadow: var(--shadow-lift); }

.logo-wall {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-wrap: wrap;
  justify-content: center; align-items: center;
  column-gap: clamp(var(--s5), 3.6vw, var(--s7));
  row-gap: clamp(var(--s5), 3vw, var(--s6));
}
.logo-wall__item { display: grid; place-items: center; }
.logo-wall__item img {
  width: auto;
  height: var(--cap, 40px);
  max-width: min(100%, 230px);
  object-fit: contain;
}
@media (max-width: 560px) {
  .logo-wall__item img { height: calc(var(--cap, 40px) * .82); }
}

/* --- 11. Site header ---------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 60;
  background: color-mix(in srgb, var(--ground) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.site-header[data-stuck="true"] { border-bottom-color: var(--line); background: var(--ground); }
.site-header__bar { display: flex; align-items: center; gap: var(--s5); min-height: 68px; }
.site-header__logo img { height: 38px; width: auto; border-radius: var(--r-flat); }
.site-header__spacer { flex: 1; }

.nav { display: none; gap: .15rem; align-items: center; }
@media (min-width: 1000px) { .nav { display: flex; } }
.nav__group { position: relative; }
.nav__btn {
  font-family: var(--font-util); font-size: var(--step--1); font-weight: 600;
  letter-spacing: .04em;
  background: transparent; border: 0; color: var(--text);
  padding: .55rem .8rem; border-radius: var(--r-pill); cursor: pointer;
  display: inline-flex; align-items: center; gap: .35rem;
}
.nav__btn:hover { color: var(--accent); }
.nav__btn[aria-expanded="true"] { background: var(--surface-sunk); color: var(--accent); }
.nav__caret { width: 8px; height: 8px; border-right: 1.5px solid currentColor;
              border-bottom: 1.5px solid currentColor; transform: translateY(-2px) rotate(45deg); }
.nav__group { --nav-gap: .4rem; }
.nav__menu {
  position: absolute; top: calc(100% + var(--nav-gap)); left: 0; min-width: 250px;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--r-flat); box-shadow: var(--shadow-lift);
  padding: .4rem; display: grid; gap: 1px;
}
.nav__menu[hidden] { display: none; }
/* Invisible bridge across the gap between button and menu. Without it the
   pointer leaves the group on the way down and the menu closes before you can
   click an option. */
.nav__menu::before {
  content: "";
  position: absolute;
  left: 0; right: 0;
  top: calc(-1 * var(--nav-gap));
  height: var(--nav-gap);
}
.nav__menu a {
  text-decoration: none; padding: .5rem .7rem; border-radius: var(--r-flat);
  font-family: var(--font-util); font-size: var(--step--1); font-weight: 500;
  letter-spacing: .01em; color: var(--text-soft);
}
.nav__menu a:hover { background: var(--surface-sunk); color: var(--accent); }

.site-header__actions { display: flex; align-items: center; gap: .55rem; }

.theme-toggle {
  display: inline-grid; place-items: center;
  width: 38px; height: 38px; padding: 0;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  color: var(--text-soft);
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }
.theme-toggle__icon { width: 17px; height: 17px; display: block; }

.menu-toggle {
  display: inline-grid; place-items: center; gap: 4px;
  width: 42px; height: 38px; background: transparent; border: 1px solid var(--line-strong);
  border-radius: var(--r-pill); cursor: pointer;
}
@media (min-width: 1000px) { .menu-toggle { display: none; } }
.menu-toggle span { display: block; width: 16px; height: 1.5px; background: var(--text); }

.mobile-nav { border-top: 1px solid var(--line); background: var(--ground);
              max-height: min(72vh, 640px); overflow-y: auto; }
.mobile-nav[hidden] { display: none; }
.mobile-nav__inner { display: grid; gap: var(--s5); padding-block: var(--s5) var(--s6); }
.mobile-nav__group { display: grid; gap: .35rem; }
.mobile-nav__group > .util { color: var(--text-mute); margin-bottom: .2rem; }
.mobile-nav__group a { text-decoration: none; font-family: var(--font-util);
                       font-size: var(--step-0); font-weight: 500; color: var(--text-soft); padding-block: .2rem; }

/* --- 12. Footer --------------------------------------------------------- */
.foot-cols { display: grid; gap: var(--s6); }
@media (min-width: 700px)  { .foot-cols { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .foot-cols { grid-template-columns: repeat(4, 1fr) 1.25fr; } }
.foot-col { display: grid; gap: .45rem; align-content: start; }
.foot-col > .util { color: var(--text-on-slab-mute); margin-bottom: .35rem; }
.foot-col a { text-decoration: none; color: var(--text-on-slab-soft);
              font-family: var(--font-util); font-size: var(--step--1); font-weight: 500;
              letter-spacing: .01em; }
.footer-social { display: flex; flex-wrap: wrap; gap: .55rem; align-items: baseline; }
.footer-social span { color: var(--text-on-slab-mute); }
.foot-col a:hover { color: var(--text-on-slab); }

/* Acknowledgement of Country. Sits on the footer ground with no panel of its
   own; a short gradient rule sets it apart. Without artwork the text runs in
   two columns so it fills the width at a comfortable line length. */
.ack { position: relative; display: grid; gap: var(--s5); }
.ack__rule { width: 72px; }
.ack__grid { display: grid; gap: var(--s6); align-items: start; }

.ack__text { color: var(--text-on-slab-soft); }
.ack__text p { font-size: var(--step-0); line-height: 1.78; }
.ack__text p + p { margin-top: .8em; }

@media (min-width: 900px) {
  .ack--no-art .ack__text { column-count: 2; column-gap: var(--s8); }
  .ack--no-art .ack__text p { margin-top: 0; }

  .ack--art .ack__grid { grid-template-columns: minmax(200px, 280px) minmax(0, 1fr); column-gap: var(--s8); }
  .ack--art .ack__text { max-width: 68ch; }
}

.ack__art { margin: 0; display: grid; gap: var(--s3); }
.ack__art img { width: 100%; height: auto; border-radius: var(--r-flat); }
.ack__credit { display: grid; gap: .15rem; color: var(--text-on-slab-mute); }
.ack__credit-title { font-family: var(--font-body); font-style: italic; color: var(--text-on-slab-soft); }

/* --- Section heading, used on every page --- */
.section-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: var(--s4); }
.section-head + .rule { margin-top: var(--s4); }
/* --- Closing call to action --- */
.cta-slab { background: var(--slab-2); color: var(--text-on-slab); }
.cta-grid { display: grid; gap: var(--s6); align-items: center; }
@media (min-width: 880px) { .cta-grid { grid-template-columns: minmax(0,1fr) auto; column-gap: var(--s8); } }
.cta-grid h2 { font-size: var(--step-4); }
.cta-actions { display: flex; flex-wrap: wrap; gap: .6rem; }
/* --- Footer --- */
.site-footer { background: var(--slab); color: var(--text-on-slab); }
.footer-brand { display: grid; gap: var(--s4); align-content: start; }
.footer-brand img { width: 190px; border-radius: var(--r-flat); }
.footer-meta { display: flex; flex-wrap: wrap; gap: var(--s5); align-items: center;
               border-top: 1px solid var(--line-on-slab); padding-top: var(--s5); color: var(--text-on-slab-mute); }
.footer-meta a { color: var(--text-on-slab-soft); }

/* --- 13. Motion --------------------------------------------------------- */
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.rise { animation: rise .7s var(--ease) both; }
.rise-2 { animation-delay: .08s; }
.rise-3 { animation-delay: .16s; }
.rise-4 { animation-delay: .24s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-delay: 0ms !important;
                           transition-duration: .001ms !important; }
  .gallery figure:hover img { transform: none; }
}