:root {
  --ink: #1e1e1e;
  --muted: #62645f;
  --paper: #ffffff;
  --soft: #f6f7f7;
  --sage: #8a927f;
  --sage-dark: #666d5e;
  --line: #d9dcd6;
  --line-dark: #a9ada5;
  --surface: #fbfaf9;
  --footer: #eeefed;
  --link-underline: #8d8f89;
  --serif: Georgia, "Times New Roman", serif;
  --sans: Arial, Helvetica, sans-serif;
  --gutter: clamp(1.25rem, 4.4vw, 4.5rem);
  --container-max: 80rem;
  --section-space: clamp(3.75rem, 6vw, 5.5rem);
  --header-height: 4.75rem;
}

/* Foundations */
*, *::before, *::after { box-sizing: border-box; }
html { overflow-x: clip; scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 1rem); }
body { margin: 0; overflow-x: hidden; color: var(--ink); background: var(--paper); font: 1rem/1.55 var(--sans); -webkit-font-smoothing: antialiased; }
img { display: block; max-width: 100%; }
a { color: inherit; }
address { font-style: normal; }

.skip-link { position: fixed; z-index: 100; top: .75rem; left: 1rem; padding: .7rem 1rem; color: var(--paper); background: var(--ink); transform: translateY(-160%); transition: transform .2s ease; }
.skip-link:focus { transform: translateY(0); }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

/* Header and navigation */
.site-header {
  position: sticky; z-index: 50; top: 0; display: flex; align-items: center; justify-content: space-between;
  min-height: var(--header-height); padding: .45rem var(--gutter); border-bottom: 1px solid var(--line); background: rgb(255 255 255 / 96%);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); transition: box-shadow .2s ease;
}
.site-header.is-scrolled { box-shadow: 0 8px 24px rgb(30 30 30 / 8%); }
.wordmark { display: flex; align-items: center; gap: 1.15rem; min-width: 0; text-decoration: none; }
.wordmark img { width: 11.75rem; height: auto; }
.wordmark__secondary { padding-left: 1.15rem; border-left: 1px solid var(--line); font-size: .88rem; font-weight: 600; white-space: nowrap; }
.site-nav { display: flex; align-items: center; gap: clamp(1.15rem, 2.4vw, 2.5rem); }
.site-nav a { position: relative; padding: .45rem 0; font-size: .95rem; font-weight: 700; text-decoration: none; white-space: nowrap; }
.site-nav a::after { position: absolute; inset: auto 0 0; height: 2px; background: var(--sage); content: ""; transform: scaleX(0); transform-origin: left; transition: transform .2s ease; }
.site-nav a:hover::after, .site-nav a:focus-visible::after { transform: scaleX(1); }
.menu-toggle { display: none; }

/* Shared content container */
.shell { width: 100%; max-width: var(--container-max); margin: 0 auto; padding-right: var(--gutter); padding-left: var(--gutter); }

/* Conference hero */
.conference {
  display: grid; grid-template-columns: minmax(25rem, .85fr) minmax(30rem, 1.15fr); align-items: stretch;
  width: 100%; max-width: var(--container-max); margin: 0 auto; padding: 2.2rem var(--gutter) .75rem;
}
.conference__copy { display: flex; flex-direction: column; justify-content: center; padding: 2.5rem clamp(2rem, 4vw, 4.5rem) 2.5rem 0; }
.conference-type, .section-index { margin: 0; color: var(--muted); font-size: .76rem; font-weight: 800; letter-spacing: .15em; text-transform: uppercase; }
.conference h1 { max-width: 7.5ch; margin: 1rem 0 0; font: 400 clamp(4.25rem, 6.3vw, 6.3rem)/.9 var(--serif); letter-spacing: -.055em; }
.conference-subtitle { max-width: 12ch; margin: 1.4rem 0 0; color: var(--sage-dark); font: italic 400 clamp(2rem, 3vw, 2.8rem)/1.08 var(--serif); }
.event-details { margin-top: 2rem; padding-top: 1.55rem; border-top: 1px solid var(--sage); }
.event-details p { margin: 0; }
.event-date { font-size: .96rem; font-weight: 800; letter-spacing: .025em; text-transform: uppercase; }
.event-date span { padding: 0 .35rem; color: var(--sage); }
.event-details address { margin-top: .8rem; font-size: 1.05rem; line-height: 1.48; }
.conference__art { min-width: 0; height: clamp(32rem, 40vw, 37rem); margin: 0; overflow: hidden; border: .7rem solid var(--soft); background: var(--soft); }
.conference__art img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 28%; }

/* Submission summary */
.submission {
  display: grid; grid-template-columns: minmax(18rem, .72fr) minmax(30rem, 1.28fr); margin-top: 0; padding-top: .8rem; padding-bottom: .8rem;
  border: 1px solid var(--line); border-left: .35rem solid var(--sage); background: var(--surface);
}
.submission__intro { padding: .7rem clamp(1.5rem, 3vw, 2.75rem) .7rem 0; border-right: 1px solid var(--line); }
.submission h2 { margin: .4rem 0 0; font: 400 clamp(2.15rem, 2.7vw, 2.75rem)/1 var(--serif); letter-spacing: -.035em; }
.submission__intro > p:not(.section-index) { max-width: 34rem; margin: .7rem 0 0; font-size: 1.12rem; line-height: 1.5; }
.details-link { display: inline-block; margin-top: .7rem; color: var(--ink); font-size: .92rem; font-weight: 600; text-decoration-color: var(--link-underline); text-decoration-thickness: 1px; text-underline-offset: .26em; }
.details-link__ending { white-space: nowrap; }
.submission__details { padding: .65rem 0 .65rem clamp(1.5rem, 3vw, 2.75rem); }
.submission__details h3 { margin: 0 0 .35rem; color: var(--muted); font-size: .82rem; letter-spacing: .12em; text-transform: uppercase; }
.guidelines { margin: 0; }
.guidelines > div { display: grid; grid-template-columns: 9rem 1fr; gap: 1rem; padding: .55rem 0; border-top: 1px solid var(--line); }
.guidelines dt { color: var(--muted); font-size: .75rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.guidelines dd { margin: 0; font-size: 1.05rem; line-height: 1.42; }
.guidelines__deadline dd { font-weight: 800; }
.submission__email { padding-top: .75rem; border-top: 1px solid var(--line); }
.submission__email p { display: flex; flex-wrap: wrap; gap: .25rem 1rem; align-items: baseline; margin: 0; }
.submission__email p > span { color: var(--muted); font-size: .76rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.submission__email p a { color: var(--ink); font-size: 1.12rem; font-weight: 800; overflow-wrap: anywhere; text-decoration-color: var(--sage); text-decoration-thickness: 2px; text-underline-offset: .26em; }
.submission__email p a:hover { color: var(--sage-dark); }

/* Call for papers */
.call { padding-top: var(--section-space); padding-bottom: var(--section-space); border-bottom: 1px solid var(--line); }
.section-heading h2, .organizer h2 { margin: .8rem 0 0; font: 400 clamp(2.55rem, 3.8vw, 3.9rem)/1 var(--serif); letter-spacing: -.04em; }
.section-heading h2 { max-width: 15ch; }
.call__body { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(2rem, 5vw, 5rem); margin-top: 2.15rem; }
.call__body p { margin: 0; font-size: 1.12rem; line-height: 1.68; }

/* Suggested topics */
.themes { padding-top: var(--section-space); padding-bottom: 1.75rem; }
.section-heading--wide { display: grid; grid-template-columns: minmax(0, 1fr) minmax(18rem, .55fr); gap: 1rem 4rem; align-items: end; }
.section-heading--wide .section-index { grid-column: 1 / -1; }
.section-heading--wide h2 { max-width: none; }
.section-heading--wide > p:last-child { max-width: 34rem; margin: 0 0 .35rem; color: var(--muted); font-size: 1.12rem; line-height: 1.55; }
.topic-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 3rem; margin: 2rem 0 0; padding: 0; list-style: none; counter-reset: topic; }
.topic-list li { position: relative; counter-increment: topic; min-height: 5.35rem; padding: 1.05rem .5rem 1.05rem 2.8rem; border-top: 1px solid var(--line); font: 400 1.18rem/1.48 var(--serif); }
.topic-list li::before { position: absolute; top: 1.25rem; left: 0; color: var(--sage-dark); content: counter(topic, decimal-leading-zero); font: 800 .7rem/1 var(--sans); letter-spacing: .05em; }

.thinkers { margin-top: 1rem; padding-top: 1.25rem; padding-bottom: 1.25rem; border-top: 1px solid var(--line-dark); border-bottom: 1px solid var(--line-dark); }
.thinkers p { margin: 0; font-size: 1.12rem; line-height: 1.65; }

/* Organizer and footer */
.organizer { display: grid; grid-template-columns: 1.1fr .9fr; gap: clamp(3rem, 7vw, 7rem); padding-top: var(--section-space); padding-bottom: var(--section-space); }
.organizer h2 { font-size: clamp(2.4rem, 3.4vw, 3.4rem); }
.organizer__bio > p:not(.section-index) { max-width: 46rem; margin: 1.2rem 0 0; font-size: 1.12rem; line-height: 1.68; }
.organizer__contact { display: grid; align-content: start; border-top: 1px solid var(--ink); }
.organizer__contact > * { margin: 0; padding: 1.1rem 0; border-bottom: 1px solid var(--line); }
.organizer__contact a { color: var(--sage-dark); font-size: .88rem; font-weight: 800; text-decoration: none; }
.organizer__contact address { font-size: 1rem; line-height: 1.55; }

.site-footer { display: grid; grid-template-columns: 1fr 1fr auto; gap: 2rem; align-items: center; padding: 1.65rem var(--gutter); border-top: 1px solid var(--line-dark); color: #3f403d; background: var(--footer); font-size: .82rem; }
.site-footer p { margin: 0; }
.site-footer a { color: #31322f; font-weight: 800; text-decoration-color: var(--link-underline); text-decoration-thickness: 1px; text-transform: uppercase; text-underline-offset: .3em; letter-spacing: .08em; }
:focus-visible { outline: 3px solid var(--sage); outline-offset: 3px; }

/* Responsive navigation */
@media (max-width: 1199px) {
  .menu-toggle { z-index: 2; display: flex; align-items: center; gap: .7rem; padding: .5rem 0 .5rem .5rem; border: 0; color: var(--ink); background: transparent; font: 800 .72rem/1 var(--sans); letter-spacing: .1em; text-transform: uppercase; }
  .menu-toggle__icon { display: grid; gap: .38rem; width: 1.5rem; }
  .menu-toggle__icon i { display: block; height: 2px; background: currentColor; transition: transform .2s ease; }
  .menu-toggle[aria-expanded="true"] i:first-child { transform: translateY(4px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] i:last-child { transform: translateY(-4px) rotate(-45deg); }
  .site-nav { position: absolute; z-index: 1; top: calc(100% + .5rem); right: var(--gutter); width: min(17rem, calc(100vw - (2 * var(--gutter)))); flex-direction: column; align-items: stretch; gap: 0; padding: .3rem 1.15rem; border: 1px solid var(--line-dark); border-top: .25rem solid var(--sage); background: var(--paper); box-shadow: 0 .8rem 2rem rgb(30 30 30 / 14%); opacity: 0; visibility: hidden; pointer-events: none; transform: translateY(-.5rem); transition: opacity .18s ease, visibility .18s ease, transform .18s ease; }
  .site-nav.is-open { opacity: 1; visibility: visible; pointer-events: auto; transform: translateY(0); }
  .site-nav a { padding: .8rem 0; border-bottom: 1px solid var(--line); font: 400 clamp(1.3rem, 5vw, 1.65rem)/1.15 var(--serif); }
  .site-nav a:last-child { border-bottom: 0; }
  .site-nav a::after { display: none; }
}

@media (max-width: 1050px) {
  .conference { display: block; padding-top: 2.75rem; padding-bottom: 1rem; text-align: center; }
  .conference__copy { align-items: center; padding: 0; }
  .conference h1 { max-width: none; font-size: clamp(3.8rem, 10vw, 5.5rem); }
  .conference-subtitle { max-width: 16ch; }
  .event-details { width: min(100%, 34rem); }
  .conference__art { width: min(86%, 43rem); height: auto; margin: 2.4rem auto 0; }
  .conference__art img { aspect-ratio: 4 / 3; object-position: 50% 27%; }
  .submission { grid-template-columns: .78fr 1.22fr; }
  .call__body { gap: 2.5rem; }
}

@media (max-width: 900px) {
  .submission { grid-template-columns: 1fr; background: var(--surface); }
  .submission__intro { padding-right: 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .submission__details { padding-left: 0; }
  .call__body { grid-template-columns: 1fr; gap: 1.25rem; }
  .topic-list { grid-template-columns: 1fr; }
  .section-heading--wide { display: block; }
  .section-heading--wide > p:last-child { margin-top: 1rem; }
  .organizer { grid-template-columns: 1fr; gap: 2.25rem; }
  .site-footer { grid-template-columns: 1fr auto; }
  .site-footer p:nth-child(2) { display: none; }
}

@media (max-width: 560px) {
  :root { --header-height: 4.25rem; }
  .site-header { padding-top: .35rem; padding-bottom: .35rem; }
  .wordmark { gap: 0; }
  .wordmark img { width: 9.25rem; }
  .wordmark__secondary { display: none; }
  .menu-toggle__label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); }
  .conference { padding-top: 2.2rem; }
  .conference-type { max-width: 34ch; font-size: .68rem; }
  .conference h1 { font-size: clamp(2.8rem, 12vw, 3.25rem); line-height: .96; }
  .conference-subtitle { max-width: 18ch; margin-top: .85rem; font-size: 1.55rem; }
  .event-details { margin-top: 1.6rem; padding-top: 1.15rem; }
  .event-date { font-size: .8rem; }
  .event-details address { font-size: .86rem; }
  .conference__art { width: 88%; margin-top: 1.75rem; border-width: .45rem; }
  .submission { width: auto; margin: 0 var(--gutter); padding-right: 1rem; padding-left: 1rem; }
  .submission h2 { font-size: 2.15rem; }
  .submission__intro { padding-top: .75rem; padding-bottom: 1rem; }
  .submission__details { padding-top: 1rem; padding-bottom: .7rem; }
  .guidelines > div { grid-template-columns: 7.15rem 1fr; gap: .7rem; }
  .guidelines dt { font-size: .66rem; }
  .guidelines dd { font-size: .86rem; }
  .submission__email p { width: 100%; }
  .section-heading h2, .organizer h2 { font-size: clamp(2.2rem, 10vw, 2.75rem); }
  .call, .themes, .organizer { padding-top: 3.5rem; padding-bottom: 3.5rem; }
  .call__body p { font-size: 1.05rem; line-height: 1.68; }
  .topic-list { margin-top: 1.5rem; }
  .topic-list li { min-height: 0; font-size: 1.08rem; }
  .thinkers { padding-top: 1rem; padding-bottom: 1rem; }
  .site-footer { grid-template-columns: 1fr; gap: .75rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}