/* PALETA: wszystkie podstawowe kolory zmienisz tutaj. */
:root {
  --page: #f7f4ee;
  --surface: #fffdf9;
  --surface-muted: #eee9e0;
  --ink: #242a27;
  --muted: #626a65;
  --accent: #6b382f;
  --accent-hover: #51281f;
  --line: #d9d1c6;
  --footer-bg: #e7e0d4;
  --footer-ink: #242a27;
  --overlay: rgb(20 24 23 / 82%);
  --placeholder: #796b60;
  --shadow: rgb(20 24 23 / 12%);

  --font-body: system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  --font-display: Georgia, "Times New Roman", serif;

  --footer-height: 228px;
  --header-height: 80px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 22px);
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.65;
  padding-bottom: var(--footer-height);
}

body:has(.poster-dialog[open]) {
  overflow: hidden;
}

a {
  color: var(--accent);
}

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

button {
  font: inherit;
}

.container {
  width: min(1120px, calc(100% - 44px));
  margin-inline: auto;
}

/* HEADER */

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  height: var(--header-height);
  background: rgb(247 244 238 / 95%);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 100%;
}

.brand {
  color: var(--ink);
  text-decoration: none;
  font: 18px/1.2 var(--font-display);
  letter-spacing: -.02em;
  white-space: nowrap;
}

.brand span {
  color: var(--accent);
  font-weight: bold;
}

.main-nav {
  display: flex;
  gap: clamp(14px, 2.6vw, 34px);
  align-items: center;
}

.main-nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: .86rem;
  font-weight: 650;
}

.main-nav a:hover,
.main-nav a:focus-visible {
  color: var(--accent);
}

/* GENERAL SECTIONS */

.section {
  padding: 86px 0 100px;
  scroll-margin-top: var(--header-height);
}

.eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  font-size: .75rem;
  font-weight: 750;
  letter-spacing: .16em;
  margin: 0 0 14px;
}

h1, h2, h3, p {
  margin-top: 0;
}

h1, h2, h3 {
  line-height: 1.18;
}

h1, h2 {
  font-family: var(--font-display);
  font-weight: normal;
  letter-spacing: -.035em;
}

h1 {
  font-size: clamp(2.8rem, 6.2vw, 5.2rem);
  max-width: 900px;
  margin-bottom: 24px;
}

h1 em {
  font-style: normal;
  color: var(--accent);
}

h2 {
  font-size: clamp(2rem, 3.6vw, 3.2rem);
}

h3 {
  font: 600 1.18rem/1.3 var(--font-display);
}

/* INTRO AND POSTER */

.event-meta {
  display: flex;
  align-items: center;
  gap: 18px;
  font-weight: 650;
  color: var(--muted);
  margin-bottom: 54px;
}

.meta-divider {
  background: var(--line);
  width: 1px;
  height: 18px;
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(210px, .75fr) minmax(0, 1.6fr);
  gap: clamp(30px, 6vw, 95px);
  align-items: start;
}

.poster-trigger {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 12px;
  color: var(--ink);
  cursor: zoom-in;
  box-shadow: 0 16px 40px var(--shadow);
  text-align: center;
}

.poster-trigger img {
  display: block;
  width: 100%;
  max-height: 480px;
  object-fit: contain;
}

.poster-trigger img.missing-image {
  min-height: 290px;
}

.poster-hint {
  display: block;
  padding: 10px 0 0;
  font-size: .82rem;
  color: var(--muted);
}

.small-link {
  display: inline-block;
  margin-top: 16px;
  font-size: .82rem;
  text-underline-offset: 3px;
}

.intro-copy h2 {
  font-size: 2rem;
  margin-bottom: 20px;
}

.intro-copy h3 {
  margin: 30px 0 10px;
}

.intro-copy p {
  color: var(--muted);
  font-size: 1.02rem;
}

.editable-placeholder {
  color: var(--placeholder) !important;
  font-style: italic;
}

.button-link {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  margin-top: 18px;
  padding: 12px 22px;
  background: var(--accent);
  color: var(--surface);
  text-decoration: none;
  font-weight: 650;
}

.button-link:hover {
  color: var(--surface);
  background: var(--accent-hover);
}

/* CONFERENCE PROGRAM */

.program-section {
  background: var(--surface);
  border-top: 1px solid var(--line);
}

.section-heading {
  margin-bottom: 35px;
}

.section-heading h2 {
  margin: 0 0 12px;
}

.section-lead {
  color: var(--muted);
}

.day-nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 44px;
}

.day-nav a {
  border: 1px solid var(--line);
  padding: 10px 15px;
  text-decoration: none;
  font-size: .86rem;
  font-weight: 650;
}

.day-nav a:hover {
  border-color: var(--accent);
  background: var(--page);
}

.schedule-day {
  margin: 0 0 58px;
  scroll-margin-top: calc(var(--header-height) + 28px);
}

.schedule-day h3 {
  font-family: var(--font-display);
  font-size: 1.7rem;
  margin: 0 0 14px;
}

.schedule-list {
  border-top: 2px solid var(--ink);
}

.schedule-item {
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr);
  gap: 20px;
  padding: 17px 8px;
  border-bottom: 1px solid var(--line);
}

.schedule-time {
  color: var(--accent);
  font-weight: 750;
  font-variant-numeric: tabular-nums;
}

.schedule-title {
  display: block;
  font-weight: 650;
  line-height: 1.45;
}

.schedule-presenter {
  color: var(--muted);
  margin-top: 5px;
  font-size: .92rem;
}

.schedule-item.is-event {
  background: var(--page);
}

.schedule-item.is-event .schedule-title {
  font-weight: 550;
}

.schedule-item.is-placeholder .schedule-title {
  font-style: italic;
  color: var(--placeholder);
  font-weight: 400;
}

/* ORGANIZERS SECTION */

.committee-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}

.committee-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 30px;
  min-height: 190px;
}

.committee-panel h3 {
  padding-bottom: 16px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.people-list {
  margin: 0;
  padding-left: 1.35rem;
  color: var(--muted);
}

.people-list li {
  padding: 3px 0;
}

/* FIXED FOOTER */

.site-footer {
  position: fixed;
  z-index: 25;
  bottom: 0;
  width: 100%;
  height: var(--footer-height);
  background: var(--footer-bg);
  color: var(--footer-ink);
  border-top: 1px solid var(--line);
  box-shadow: 0 -3px 18px var(--shadow);
}

.footer-inner {
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-block: 12px;
}

/* Funding banner - 100px high */

.funding-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 100px;
  min-height: 0;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  padding-bottom: 9px;
}

.funding-image {
  display: block;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.funding-placeholder {
  color: var(--placeholder);
  font-size: .75rem;
  font-weight: 650;
  text-align: center;
  border: 1px dashed var(--placeholder);
  padding: 10px;
}

/* Organizers 1/3, partners 2/3 */

.footer-groups {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 6fr);
  align-items: center;
  gap: 24px;
  min-height: 0;
  flex: 1;
}

.footer-group {
	display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto minmax(0, 1fr);
  gap: 5px;
  align-items: center;
  min-width: 0;
  min-height: 0;
}

.footer-label {
	grid-column: 1;
  grid-row: 1;
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  font-weight: 700;
  width: 100%;
}

.footer-logos {
	grid-column: 1;
  grid-row: 2;
  display: flex;
  align-items: center;
  gap: 13px;
  width: 100%;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: thin;
}

/* Enlarged logos */

.footer-logos img {
	display: block;
  max-width: 150px;
  max-height: 60px;
	margin: 0 10px;
  width: auto;
  height: auto;
  object-fit: contain;
}

.logo-placeholder {
  border: 1px dashed var(--placeholder);
  padding: 9px 12px;
  font: 700 .64rem/1.2 var(--font-body);
  color: var(--placeholder);
  white-space: nowrap;
}

/* BACK TO TOP */

.back-to-top {
  position: fixed;
  right: 25px;
  bottom: calc(var(--footer-height) + 22px);
  z-index: 15;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  background: var(--surface);
  display: grid;
  place-items: center;
  color: var(--accent);
  font-size: 1.45rem;
  text-decoration: none;
  box-shadow: 0 3px 16px var(--shadow);
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: .2s ease;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}

/* POSTER MODAL */

.poster-dialog {
  width: min(95vw, 1100px);
  max-width: none;
  max-height: 95vh;
  padding: 0;
  border: 0;
  background: transparent;
  overflow: visible;
}

.poster-dialog::backdrop {
  background: var(--overlay);
}

.dialog-frame {
  display: flex;
  justify-content: center;
  position: relative;
}

.dialog-frame img {
  display: block;
  max-height: 92vh;
  max-width: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  background: var(--surface);
}

.dialog-close {
  position: absolute;
  right: 0;
  top: 0;
  transform: translate(35%, -35%);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--ink);
  cursor: pointer;
  font-size: 1.6rem;
  height: 42px;
  width: 42px;
  line-height: 1;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

/* MOBILE */

@media (max-width: 700px) {
  :root {
    --header-height: 104px;
    --footer-height: 242px;
  }

  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 13px;
  }

  .brand {
    font-size: 17px;
  }

  .main-nav {
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    white-space: nowrap;
    scrollbar-width: thin;
    padding-bottom: 4px;
  }

  .main-nav a {
    flex-shrink: 0;
  }

  .main-nav {
    gap: 21px;
  }

  .main-nav a {
    font-size: .79rem;
  }

  .section {
    padding: 53px 0 72px;
  }

  .event-meta {
    margin-bottom: 34px;
  }

  .intro-grid {
    grid-template-columns: 1fr;
  }

  .poster-column {
    width: min(100%, 370px);
  }

  .committee-grid {
    grid-template-columns: 1fr;
  }

  /* Mobile footer */

  .footer-inner {
    padding-block: 8px;
    gap: 7px;
  }

  .funding-row {
    flex-basis: 100px;
    padding-bottom: 6px;
  }

  .funding-placeholder {
    padding: 5px;
    font-size: .62rem;
  }

  .footer-groups {
    gap: 6px;
    grid-template-columns: 1fr;
    overflow-y: auto;
  }

  .footer-group {
    gap: 10px;
  }

  .footer-label {
    width: 100px;
    font-size: .6rem;
    line-height: 1.3;
  }

  .footer-logos {
    flex: 1;
  }

  .footer-logos img {
    max-height: 48px;
    max-width: 150px;
  }

  .logo-placeholder {
    padding: 5px;
    font-size: .55rem;
  }

  .schedule-item {
    grid-template-columns: 62px minmax(0, 1fr);
    gap: 12px;
  }

  .dialog-close {
    transform: translate(-5px, 5px);
  }
}

/* ACCESSIBILITY */

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

  *,
  *::before,
  *::after {
    transition-duration: .01ms !important;
  }
}


/* UDZIAŁ W KONFERENCJI */

.participation-section {
  background: var(--surface-muted);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.participation-section .section-heading {
  margin-bottom: 25px;
}

.participation-content {
  max-width: 850px;
}

.participation-content p {
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--ink);
  margin-bottom: 18px;
}

.participation-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 30px;
  margin-top: 30px;
}

.participation-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: .9rem;
  font-weight: 650;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 4px;
}

.participation-link:hover {
  color: var(--accent-hover);
  border-color: var(--accent-hover);
}

.participation-link span {
  font-size: 1.2rem;
  line-height: 1;
}