/* ============================================================
   FQC 2026 — stylesheet
   Palette: UCL Dark Purple + UCL White, Heritage Blue accent
   Type:    Fraunces (display serif) + Inter (body) + JetBrains Mono (labels)
   ============================================================ */

:root {
  /* Brand — strictly UCL official palette
     https://www.ucl.ac.uk/brand-and-experience/brand/visual-guidelines/colour */
  --ucl-dark-purple:   #361a54;    /* lead */
  --ucl-white:         #fafafa;    /* lead */
  --ucl-bright-purple: #993bff;    /* lead */
  --ucl-mid-purple:    #ba82ff;    /* lead */
  --ucl-light-purple:  #ddbdff;    /* support */
  --ucl-pale-purple:   #eedeff;    /* support */
  --ucl-heritage-blue: #30d6ff;    /* support */

  /* Semantic tokens mapped to UCL palette */
  --ink:        var(--ucl-dark-purple);     /* primary dark / hero bg */
  --ink-2:      #4b2670;                    /* dark-purple lifted ~+15% lightness */
  --ink-3:      #5d2f88;                    /* deeper toward bright purple */

  --paper:      var(--ucl-white);
  --paper-2:    var(--ucl-pale-purple);     /* alt-section bg (was custom #f3edf9) */
  --line:       var(--ucl-light-purple);    /* borders / dividers (was custom #e3dde9) */

  --text:       var(--ucl-dark-purple);     /* body on white — 14:1 contrast */
  --text-soft:  #5d2f88;                    /* secondary body — sits between dark and bright purple */
  --text-mute:  #8a6db0;                    /* muted — derived purple-grey, ~3.5:1 (small text only) */

  --accent:     var(--ucl-heritage-blue);   /* CTAs / links — pops on dark purple */
  --accent-2:   var(--ucl-bright-purple);   /* strong purple accent (was custom mid) */
  --accent-warm:var(--ucl-mid-purple);      /* softer purple highlight */

  /* Typography */
  --serif: "Fraunces", "Times New Roman", serif;
  --sans:  "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono:  "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Layout */
  --maxw:     1200px;
  --gutter:   clamp(1.25rem, 3vw, 2.5rem);
  --section-y: clamp(4.5rem, 10vw, 8rem);
  --radius:   14px;
  --radius-lg: 22px;

  /* Motion */
  --ease: cubic-bezier(.2, .7, .2, 1);
}

/* ============================================================
   Reset & base
   ============================================================ */

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a { color: inherit; text-decoration: none; }
p { margin: 0 0 1em; }
ul, ol { padding: 0; margin: 0; list-style: none; }

::selection { background: var(--accent); color: var(--ink); }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: .75rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 1rem; top: 1rem; }

/* ============================================================
   Header / nav
   ============================================================ */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  padding-block: 1rem;
  color: var(--paper);
  transition: background-color .3s var(--ease), backdrop-filter .3s var(--ease), color .3s var(--ease);
}
.site-header.is-scrolled {
  background: rgba(54, 26, 84, .85);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid rgba(255,255,255,.06);
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: .01em;
  color: inherit;
}
.brand-mark {
  display: inline-flex;
  color: var(--accent);
}
.brand-text { display: inline-flex; gap: .35em; }
.brand-year {
  font-family: var(--mono);
  font-weight: 500;
  font-size: .82em;
  letter-spacing: .04em;
  align-self: center;
  color: var(--accent);
}

.primary-nav ul {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}
.primary-nav a {
  font-size: .92rem;
  font-weight: 500;
  letter-spacing: .01em;
  position: relative;
  padding-block: .25rem;
  color: inherit;
  opacity: .8;
  transition: opacity .2s var(--ease);
}
.primary-nav a:hover { opacity: 1; }
.primary-nav a::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s var(--ease);
}
.primary-nav a:hover::after { transform: scaleX(1); }

.primary-nav .nav-cta {
  border: 1px solid currentColor;
  border-radius: 999px;
  padding: .5rem 1rem;
  opacity: 1;
}
.primary-nav .nav-cta::after { display: none; }
.primary-nav .nav-cta:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--ink);
}

.nav-toggle {
  display: none;
  border: 0;
  background: transparent;
  width: 44px;
  height: 44px;
  padding: 0;
  cursor: pointer;
  color: inherit;
  position: relative;
  z-index: 60; /* keep above the open mobile nav menu */
}
.brand { position: relative; z-index: 60; }
.nav-toggle span {
  position: absolute;
  left: 50%;
  width: 22px;
  height: 1.5px;
  background: currentColor;
  border-radius: 2px;
  transform: translateX(-50%);
  transition: transform .3s var(--ease), opacity .3s var(--ease), top .3s var(--ease);
}
.nav-toggle span:nth-child(1) { top: 16px; }
.nav-toggle span:nth-child(2) { top: 22px; }
.nav-toggle span:nth-child(3) { top: 28px; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { top: 22px; transform: translateX(-50%) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { top: 22px; transform: translateX(-50%) rotate(-45deg); }

@media (max-width: 820px) {
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }

  .primary-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    width: 100vw;
    height: 100svh;
    background: var(--ink);
    color: var(--paper);
    padding: 6rem var(--gutter) 2rem;
    transform: translateY(-100%);
    transition: transform .4s var(--ease);
    pointer-events: none;
    overflow-y: auto;
  }
  .primary-nav.is-open {
    transform: translateY(0);
    pointer-events: auto;
  }
  .primary-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: .5rem;
  }
  .primary-nav a {
    font-family: var(--serif);
    font-size: 2rem;
    font-weight: 500;
    line-height: 1.2;
    opacity: 1;
  }
  .primary-nav .nav-cta {
    margin-top: 1rem;
    font-family: var(--sans);
    font-size: 1rem;
  }
}

/* ============================================================
   Hero
   ============================================================ */

.hero {
  position: relative;
  min-height: 100svh;
  color: var(--paper);
  background: var(--ink);
  overflow: hidden;
  display: flex;
  align-items: center;
  isolation: isolate;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: url('assets/canary-wharf.jpg');
  background-size: cover;
  background-position: center 30%;
  background-repeat: no-repeat;
  /* desaturate hard so the warm sunset stops fighting the purple */
  filter: saturate(.3) brightness(.65) contrast(1.05);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 0;
  /* purple stain over the photo + bottom darken for text contrast */
  background:
    linear-gradient(180deg, rgba(54,26,84,.55) 0%, rgba(54,26,84,.85) 100%),
    linear-gradient(180deg, transparent 30%, rgba(20,8,38,.55) 100%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  padding-block: 8rem 6rem;
}

.eyebrow {
  font-family: var(--mono);
  font-size: .8rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1.5rem;
}

.hero-title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(4.5rem, 14vw, 11rem);
  line-height: .9;
  letter-spacing: -.04em;
  margin: 0 0 .35em;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: .12em;
}
.hero-fqc {
  background: linear-gradient(180deg, var(--paper) 0%, #b9c1d6 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-2026 {
  font-family: var(--mono);
  font-weight: 500;
  font-size: .26em;
  letter-spacing: .04em;
  color: var(--accent);
  align-self: flex-end;
  padding-bottom: .9em;
}

.hero-tagline {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1.25rem, 2.4vw, 1.75rem);
  color: rgba(250, 250, 250, .82);
  margin: 0 0 3rem;
  letter-spacing: .005em;
}
.hero-tagline .amp { color: var(--accent); font-style: normal; }

.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, max-content));
  gap: clamp(1.5rem, 4vw, 3.5rem);
  margin: 0 0 3rem;
  padding: 1.25rem 0;
  border-top: 1px solid rgba(255,255,255,.12);
  border-bottom: 1px solid rgba(255,255,255,.12);
}
.hero-meta dt {
  font-family: var(--mono);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-mute);
  margin: 0 0 .35rem;
}
.hero-meta dd {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.05rem, 1.8vw, 1.4rem);
  font-weight: 500;
  letter-spacing: -.005em;
}

@media (max-width: 600px) {
  .hero-meta {
    grid-template-columns: 1fr;
    gap: 1.1rem;
  }
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Scroll hint */
.scroll-hint {
  position: absolute;
  bottom: 1.75rem;
  left: 50%;
  transform: translateX(-50%);
  width: 28px;
  height: 44px;
  border: 1px solid rgba(255,255,255,.3);
  border-radius: 14px;
  z-index: 1;
  display: flex;
  justify-content: center;
  padding-top: 8px;
}
.scroll-hint span {
  width: 2px;
  height: 8px;
  background: var(--paper);
  border-radius: 1px;
  animation: scroll-bounce 1.8s ease-in-out infinite;
}
@keyframes scroll-bounce {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50%      { transform: translateY(10px); opacity: 0; }
}
@media (max-width: 600px) { .scroll-hint { display: none; } }

/* ============================================================
   Buttons
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: .65em;
  padding: .85em 1.5em;
  border-radius: 999px;
  font-family: var(--sans);
  font-size: .95rem;
  font-weight: 500;
  letter-spacing: .005em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .2s var(--ease), background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}
.btn-sm { padding: .6em 1.1em; font-size: .88rem; }

.btn-primary {
  background: var(--accent);
  color: var(--ink);
}
.btn-primary:hover { transform: translateY(-1px); background: var(--paper); }
.section .btn-primary:hover { background: var(--ink); color: var(--paper); }

.btn-ghost {
  border-color: rgba(255,255,255,.3);
  color: var(--paper);
}
.btn-ghost:hover { border-color: var(--paper); background: rgba(255,255,255,.06); }

.section-venue .btn-ghost,
.section-about .btn-ghost {
  border-color: var(--ink);
  color: var(--ink);
}
.section-venue .btn-ghost:hover,
.section-about .btn-ghost:hover {
  background: var(--ink);
  color: var(--paper);
}

/* ============================================================
   Sections — common
   ============================================================ */

.section {
  padding-block: var(--section-y);
  position: relative;
}
.section + .section { border-top: 1px solid var(--line); }

.section-label {
  font-family: var(--mono);
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-mute);
  margin: 0 0 1rem;
}
.section-title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--ink);
  margin: 0;
  max-width: 24ch;
}

.section-head { margin-bottom: clamp(2.5rem, 5vw, 4rem); }

/* Two-column section */
.two-col {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: start;
}
.two-col .col-head { position: sticky; top: 7rem; }

@media (max-width: 820px) {
  .two-col { grid-template-columns: 1fr; gap: 2.5rem; }
  .two-col .col-head { position: static; }
}

/* Prose */
.prose p { font-size: 1.05rem; color: var(--text-soft); max-width: 60ch; }
.prose .lede {
  font-family: var(--serif);
  font-size: clamp(1.25rem, 1.9vw, 1.55rem);
  font-weight: 400;
  line-height: 1.45;
  color: var(--ink);
  margin-bottom: 1.5em;
  letter-spacing: -.005em;
}
.prose em { font-style: italic; }
/* bolded topic words pick up the dark purple of the nav bar */
.prose strong { color: var(--ink); font-weight: 600; }

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: 2rem;
}
.tag-list li {
  font-family: var(--mono);
  font-size: .78rem;
  font-weight: 500;
  letter-spacing: .04em;
  padding: .45em 1em;
  background: var(--paper-2);          /* UCL Pale Purple */
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--accent-2);              /* UCL Bright Purple */
}

.muted { color: var(--text-mute); }
.small { font-size: .85rem; }

/* Tube / DLR line indicators — colour bars match official TfL line colours */
.tube-heading { margin: 1.25rem 0 .35rem; }
.tube-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.25rem;
  display: grid;
  gap: .55rem;
  font-size: .92rem;
}
.tube-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem .9rem;
  color: var(--text-soft);
}
.tube-list strong {
  color: var(--ink);
  font-weight: 600;
}
.tube-line {
  display: inline-flex;
  align-items: center;
  gap: .45em;
  font-family: var(--mono);
  font-size: .82em;
  letter-spacing: .02em;
  color: var(--text-soft);
  white-space: nowrap;
}
.tube-line::before {
  content: "";
  display: inline-block;
  width: 1.5em;
  height: 4px;
  background: var(--tube, currentColor);
  border-radius: 1px;
}

/* ============================================================
   Speakers
   ============================================================ */

.speaker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: clamp(1.5rem, 3vw, 2.5rem) clamp(1rem, 2vw, 1.75rem);
}
.speaker {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.speaker-portrait {
  aspect-ratio: 4/5;
  background:
    radial-gradient(ellipse at 35% 30%, rgba(48,214,255,.45), transparent 55%),
    radial-gradient(ellipse at 70% 80%, rgba(186,130,255,.35), transparent 55%),
    var(--ink);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--paper);
  font-family: var(--serif);
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 500;
  letter-spacing: .02em;
  position: relative;
  overflow: hidden;
}
.speaker-portrait::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(160deg, transparent 60%, rgba(0,0,0,.35));
  z-index: 2;
  pointer-events: none;
}
.speaker-portrait span { position: relative; z-index: 1; }
.speaker-portrait img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 25%;
  z-index: 1;
}

.speaker h3 {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 500;
  letter-spacing: -.005em;
  color: var(--ink);
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: .5em;
  flex-wrap: wrap;
}
.speaker-link {
  color: inherit;
  transition: color .2s var(--ease);
  position: relative;
}
.speaker-link:hover { color: var(--accent); }
.speaker-arrow {
  display: inline-block;
  font-size: .55em;
  vertical-align: .35em;
  margin-left: .25em;
  opacity: 0;
  color: var(--text-mute);
  transition: opacity .2s var(--ease), transform .25s var(--ease), color .2s var(--ease);
}
.speaker-link:hover .speaker-arrow { opacity: 1; color: var(--accent); transform: translate(2px, -2px); }
.speaker .tbc {
  font-family: var(--mono);
  font-size: .65rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  background: var(--paper-2);
  border: 1px solid var(--line);
  color: var(--text-mute);
  padding: .15em .5em;
  border-radius: 4px;
}
.speaker .affil {
  margin: 0;
  color: var(--text-mute);
  font-size: 1.02rem;
}

/* ============================================================
   Program / days
   ============================================================ */

.day-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}
.day {
  display: grid;
  grid-template-columns: minmax(120px, 180px) minmax(140px, 200px) 1fr;
  gap: 1.5rem;
  padding-block: 1.75rem;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.day-date {
  font-family: var(--mono);
  font-size: .85rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--text-mute);
  margin: 0;
}
.day-name {
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--ink);
  margin: 0;
}
.day-blurb {
  margin: 0;
  color: var(--text-soft);
}
@media (max-width: 700px) {
  .day {
    grid-template-columns: 1fr;
    gap: .35rem;
    padding-block: 1.25rem;
  }
}

/* ============================================================
   Register cards
   ============================================================ */

.section-register { background: var(--ink); color: var(--paper); }
.section-register .section-title { color: var(--paper); }
.section-register .section-label { color: var(--accent); }

.register-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}
.register-card {
  padding: 2rem;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,.025);
  display: flex;
  flex-direction: column;
  gap: .35rem;
  transition: border-color .2s var(--ease), background-color .2s var(--ease), transform .2s var(--ease);
}
.register-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.register-card-quiet { background: transparent; border-style: dashed; }
.register-card-quiet:hover { border-color: rgba(255,255,255,.4); transform: none; }

.card-step {
  font-family: var(--mono);
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0;
}
.register-card h3 {
  font-family: var(--serif);
  font-size: 1.6rem;
  font-weight: 500;
  letter-spacing: -.01em;
  margin: 0 0 .35em;
  color: var(--paper);
}
.register-card p {
  color: rgba(250, 250, 250, .72);
  font-size: .98rem;
  margin: 0 0 1em;
}
.card-status {
  margin-top: auto;
  font-family: var(--mono);
  font-size: .8rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--accent-warm);
}

.dates-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-top: 3rem;
  padding: 1.5rem 0 0;
  border-top: 1px solid rgba(255,255,255,.12);
}
.dates-strip > div { padding: 0; }
.dates-strip dt {
  font-family: var(--mono);
  font-size: .7rem;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-mute);
  margin: 0 0 .25rem;
}
.dates-strip dd {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--paper);
}

/* ============================================================
   Organizers
   ============================================================ */

.org-group-title {
  font-family: var(--serif);
  font-size: 1.45rem;
  font-weight: 500;
  letter-spacing: -.01em;
  color: var(--ink);
  margin: 0 0 1rem;
}
.partners-note {
  max-width: 60ch;
  margin: 0 0 clamp(2rem, 4vw, 3rem);
  color: var(--text-soft);
  font-size: 1.02rem;
  line-height: 1.6;
}
.partners-note a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color .2s var(--ease);
}
.partners-note a:hover { color: var(--accent); }
.org-list + .org-group-title,
.speaker-grid + .org-group-title { margin-top: clamp(2.25rem, 4vw, 3rem); }
.speakers-empty { padding: 1.5rem 0; font-size: 1rem; }

.org-list {
  display: grid;
  gap: .5rem;
}
.org-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.org-list li:first-child { border-top: 1px solid var(--line); }
.org-list.org-list-stacked li { grid-template-columns: 1fr; gap: .25rem; padding: 1.1rem 0; }
.org-list.org-list-stacked span { text-align: left; }
.org-list strong {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 500;
  letter-spacing: -.005em;
  color: var(--ink);
}
.org-list span {
  font-size: .95rem;
  font-weight: 500;
  color: var(--text-soft);
  text-align: right;
}
@media (max-width: 600px) {
  .org-list li { grid-template-columns: 1fr; gap: .25rem; }
  .org-list span { text-align: left; }
}

/* ============================================================
   Logo grid (partners / sponsors)
   ============================================================ */

.logo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 0 0 clamp(2rem, 4vw, 3rem);
}
.logo-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  min-height: 150px;
  padding: 1.5rem 1.25rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text-soft);
  text-decoration: none;
  text-align: center;
  font-family: var(--sans);
  font-size: .92rem;
  font-weight: 500;
  line-height: 1.35;
  transition: border-color .25s var(--ease), color .25s var(--ease), transform .25s var(--ease);
}
.logo-tile:hover {
  border-color: var(--ink);
  color: var(--ink);
  transform: translateY(-2px);
}
.logo-tile img { max-width: 80%; max-height: 56px; width: auto; height: auto; }
.logo-tile-name {
  font-family: var(--mono);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--text-mute);
  line-height: 1.4;
}
.logo-tile:hover .logo-tile-name { color: var(--ink); }
.logo-grid-solo {
  grid-template-columns: repeat(auto-fit, minmax(220px, 360px));
}
.logo-tile img.logo-boxed {
  width: auto;
  max-width: 72%;
  max-height: none;
  background: #000;
  padding: 11px 16px;
  box-sizing: border-box;
}

.logo-tile-empty {
  border-style: dashed;
  background: transparent;
  color: var(--text-mute);
  cursor: default;
}
.logo-tile-empty:hover {
  border-color: var(--text-mute);
  color: var(--text-mute);
  transform: none;
}

/* ============================================================
   Past editions
   ============================================================ */

.past-list { display: grid; gap: 0; }
.past-list li {
  display: grid;
  grid-template-columns: 100px minmax(160px, 1fr) 2fr;
  gap: 2rem;
  padding-block: 1.5rem;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
  transition: padding .25s var(--ease);
}
.past-list li:first-child { border-top: 1px solid var(--line); }
.past-list li:hover { padding-inline-start: 1rem; }
.past-year {
  font-family: var(--mono);
  font-size: .95rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--text-mute);
}
.past-where {
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -.01em;
}
a.past-where { transition: color .2s var(--ease); }
a.past-where:hover { color: var(--accent); }
.past-arrow {
  display: inline-block;
  font-size: .65em;
  color: var(--text-mute);
  vertical-align: .15em;
  margin-left: .15em;
  transition: transform .25s var(--ease), color .2s var(--ease);
}
a.past-where:hover .past-arrow { color: var(--accent); transform: translate(2px, -2px); }
.past-theme {
  color: var(--text-soft);
  font-size: .95rem;
}
@media (max-width: 700px) {
  .past-list li {
    grid-template-columns: 1fr;
    gap: .35rem;
  }
  .past-list li:hover { padding-inline-start: 0; }
}

/* ============================================================
   Venue photo
   ============================================================ */

.venue-photo {
  margin: 0 0 clamp(2.5rem, 5vw, 4rem);
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink);
  box-shadow:
    0 1px 2px rgba(54, 26, 84, .04),
    0 18px 48px -22px rgba(54, 26, 84, .35);
}
.venue-photo img {
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  object-position: center 65%;
  display: block;
  transform: scale(1.02);                /* hide the 1px image edge under round corners */
  transition: transform .9s var(--ease);
}
.venue-photo:hover img { transform: scale(1.05); }

.venue-photo figcaption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 1.5rem 1.75rem 1.25rem;
  font-family: var(--mono);
  font-size: .78rem;
  font-weight: 500;
  letter-spacing: .08em;
  color: rgba(250, 250, 250, .9);
  background: linear-gradient(to top, rgba(54, 26, 84, .75), transparent);
}

@media (max-width: 600px) {
  .venue-photo img { aspect-ratio: 16 / 10; }
  .venue-photo figcaption {
    padding: 1rem 1rem .85rem;
    font-size: .72rem;
  }
}

/* ============================================================
   Contact
   ============================================================ */

.contact-mail {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 3.5vw, 2.5rem);
  font-weight: 500;
  letter-spacing: -.01em;
  color: var(--ink);
  border-bottom: 1px solid currentColor;
  padding-bottom: .1em;
  transition: color .2s var(--ease);
}
.contact-mail:hover { color: var(--accent); }

.address {
  font-family: var(--mono);
  font-size: .92rem;
  line-height: 1.7;
  color: var(--text-mute);
  margin-block: 2rem 1.5rem;
}

/* ============================================================
   Footer
   ============================================================ */

.site-footer {
  background: var(--ink);
  color: var(--paper);
  padding-block: 3rem;
}
.footer-inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}
.footer-brand .brand-text { font-family: var(--serif); font-size: 1.5rem; font-weight: 500; }
.footer-brand p { margin-top: .5rem; }
.footer-meta { text-align: right; }
.footer-meta p { margin: 0 0 .25rem; }
.site-footer .muted { color: rgba(250, 250, 250, .55); }

@media (max-width: 600px) {
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .footer-meta { text-align: left; }
}

/* ============================================================
   Reveal animation — progressive enhancement only
   Default state is visible; JS adds .reveal-ready to <html>
   to opt in. This way no-JS / SEO / screenshots stay correct.
   ============================================================ */

.reveal-ready .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal-ready .reveal.is-visible {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .reveal-ready .reveal { opacity: 1; transform: none; }
}

/* ============================================================
   Compact density — applied with html[data-density="compact"]
   ============================================================ */
html[data-density="compact"] { --section-y: clamp(2.25rem, 5vw, 4rem); }
html[data-density="compact"] .hero { min-height: auto; }
html[data-density="compact"] .hero-inner { padding-block: 5rem 3rem; }
html[data-density="compact"] .hero-tagline { margin-bottom: 1.75rem; }
html[data-density="compact"] .hero-meta { margin-bottom: 1.75rem; padding-block: 1rem; }
html[data-density="compact"] .hero-title { font-size: clamp(3.5rem, 11vw, 8.5rem); }
html[data-density="compact"] .scroll-hint { display: none; }
html[data-density="compact"] .section-head { margin-bottom: clamp(1.25rem, 2.5vw, 2rem); }
html[data-density="compact"] .section-title { font-size: clamp(1.75rem, 3.6vw, 2.6rem); }
html[data-density="compact"] .speaker-grid { gap: clamp(1rem, 2vw, 1.5rem) clamp(.85rem, 1.5vw, 1.25rem); }
html[data-density="compact"] .speaker { gap: .65rem; }
html[data-density="compact"] .day { padding-block: 1.1rem; }
html[data-density="compact"] .org-list li { padding: .85rem 0; }
html[data-density="compact"] .past-list li { padding-block: 1rem; }
html[data-density="compact"] .register-card { padding: 1.4rem; }
html[data-density="compact"] .dates-strip { margin-top: 1.75rem; padding-top: 1rem; }
html[data-density="compact"] .two-col { gap: clamp(1.5rem, 4vw, 3rem); }
html[data-density="compact"] .two-col .col-head { top: 5rem; }