/* ── Tokens ──────────────────────────────────────────── */
/* Muted, low-saturation palette — dusty teal + terracotta instead of vivid brand colors */
:root {
  --bg:         #F7F7F5;
  --surface:    #FFFFFF;
  --surface2:   #F1F1EF;
  --border:     #E3E3DF;
  --text:       #24262B;
  --muted:      #4F5258;
  --accent:     #3D6579;
  --warm:       #7E5230;
  --warm-bg:    #F6EBE0;
  --nav-bg:     rgba(247,247,245,0.9);
  --shadow:     0 1px 2px rgba(20,20,20,.04), 0 4px 12px rgba(20,20,20,.04);
  /* Hero — soft charcoal, not saturated navy */
  --hero-bg:    #2B3440;
  --hero-bg2:   #333F4E;
  --hero-text:  #F1F0EC;
  --hero-muted: #C9CFD4;
  --hero-acc:   #9BC2B8;
  /* Type scale — shared sizes for badges, meta text, list/card text, and body copy.
     Bumped up under the mobile media query below instead of tuning ~30 selectors by hand. */
  --fs-2xs:  12px;
  --fs-xs:   13.5px;
  --fs-sm:   14.5px;
  --fs-md:   15.5px;
  --fs-base: 16.5px;
  --fs-h3:   16px;
}
@media (max-width: 700px) {
  :root {
    --fs-2xs:  12.5px;
    --fs-xs:   14px;
    --fs-sm:   15px;
    --fs-md:   16px;
    --fs-base: 17px;
    --fs-h3:   16.5px;
  }
}

/* ── Reset & Base ────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.65;
}
a { color: var(--accent); }
p { color: var(--muted); max-width: 68ch; line-height: 1.72; }

/* ── Nav ─────────────────────────────────────────────── */
nav {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 200;
  background: var(--nav-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  height: 54px;
  padding-inline: clamp(16px, 4vw, calc((100vw - 1120px) / 2));
}
.brand {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 14.5px;
  letter-spacing: -0.01em;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}
.brand em { font-style: normal; color: var(--accent); }
.brand-tag { font-weight: 500; font-size: 0.8em; color: var(--muted); }
.nav-links {
  display: flex;
  gap: 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav-links::-webkit-scrollbar { display: none; }
.nav-links a {
  font-family: 'Outfit', sans-serif;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  padding: 6px 11px;
  border-radius: 7px;
  transition: color .13s, background .13s;
  white-space: nowrap;
}
.nav-links a:hover { color: var(--text); background: var(--surface); }
.nav-toggle { display: none; }

/* Mobile: links collapse into a dropdown behind the menu button.
   Scoped to .js so the plain scrolling row stays usable without JavaScript. */
@media (max-width: 820px) {
  .js .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
  }
  .nav-toggle .icon-close,
  .nav-toggle[aria-expanded="true"] .icon-open { display: none; }
  .nav-toggle[aria-expanded="true"] .icon-close { display: block; }
  .js .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    padding: 8px clamp(16px, 4vw, 24px) 12px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }
  .nav-toggle[aria-expanded="true"] + .nav-links { display: flex; }
  .js .nav-links a {
    display: block;
    padding: 12px 11px;
    font-size: var(--fs-base);
  }
}

/* ── Hero ────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, var(--hero-bg) 0%, var(--hero-bg2) 100%);
  position: relative;
  overflow: hidden;
  padding: 76px clamp(20px, 5vw, calc((100vw - 1120px) / 2)) 68px;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('assets/hero-bg.svg') right -2% center / auto 82% no-repeat;
  opacity: .22;
  -webkit-mask-image: linear-gradient(90deg, transparent 20%, #000 70%);
          mask-image: linear-gradient(90deg, transparent 20%, #000 70%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 720px;
}
.eyebrow {
  font-family: 'Outfit', sans-serif;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--hero-acc);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}
.eyebrow::before {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--hero-acc);
  border-radius: 1px;
}
h1 {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: clamp(2.2rem, 5.5vw, 3.6rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--hero-text);
  text-wrap: balance;
  margin-bottom: 22px;
}
h1 em { font-style: italic; color: var(--hero-acc); }
h1 .h1-pre {
  display: block;
  font-size: .5em;
  line-height: 1.3;
  margin-bottom: 8px;
  opacity: .85;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 26px;
}
.hero-badge {
  font-family: 'Outfit', sans-serif;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--hero-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}
.hero-lead {
  color: var(--hero-muted);
  font-size: var(--fs-base);
  line-height: 1.72;
  max-width: 580px;
  margin-bottom: 34px;
}
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; }
.btn-fill {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: var(--fs-sm);
  background: var(--hero-acc);
  color: #0D2320;
  padding: 10px 22px;
  border-radius: 8px;
  text-decoration: none;
  transition: opacity .15s;
  display: inline-block;
}
.btn-fill:hover { opacity: .85; color: #0D2320; }
.btn-ghost {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: var(--fs-sm);
  border: 1.5px solid rgba(155,194,184,.35);
  color: var(--hero-text);
  padding: 10px 22px;
  border-radius: 8px;
  text-decoration: none;
  transition: border-color .15s, background .15s;
  display: inline-block;
}
.btn-ghost:hover { border-color: rgba(155,194,184,.65); background: rgba(155,194,184,.1); color: var(--hero-text); }

/* ── Layout ──────────────────────────────────────────── */
main {
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 40px);
}
section {
  padding-block: 68px;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: calc(54px + env(safe-area-inset-top, 0px));
}
section:last-child { border-bottom: none; }

/* ── Section headers ─────────────────────────────────── */
h2 {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(1.45rem, 3vw, 1.95rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1.2;
  text-wrap: balance;
  margin-bottom: 8px;
}
.section-desc {
  color: var(--muted);
  font-size: var(--fs-base);
  margin-bottom: 32px;
  max-width: 60ch;
}
h3 {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: var(--fs-h3);
  color: var(--text);
  line-height: 1.3;
}

/* ── Section lead paragraph (e.g. About) ──────────────── */
.section-lead {
  color: var(--muted);
  font-size: var(--fs-base);
  line-height: 1.7;
  max-width: 68ch;
  margin-top: 16px;
}

/* ── Organizing Committee (organizers + program committee) ── */
#committee h3 { margin: 32px 0 12px; }
#committee h3:first-of-type { margin-top: 0; }
.org-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 14px;
  margin-top: 8px;
}
.org-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  box-shadow: var(--shadow);
}
.org-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  flex-shrink: 0;
  overflow: hidden;
}
.org-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: contrast(1.08) saturate(1.05);
}
.org-card h3 { font-size: var(--fs-md); margin-bottom: 2px; }
.org-affil { font-family: 'Outfit', sans-serif; font-size: var(--fs-xs); color: var(--muted); max-width: none; }
.org-logos {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-around;
  gap: 16px 40px;
  margin-top: 14px;
  padding: 12px 24px;
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.org-logos img { height: 34px; width: auto; max-width: 200px; object-fit: contain; }
.org-logos img.logo-hu { height: 52px; }
.org-logos img.logo-hpi { height: 44px; }
.org-logos img.logo-tencent { height: 22px; }

/* ── CFP (merged: intro + topics + submission types + dates) ── */
.cfp-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 40px;
  align-items: start;
}
.cfp-main h3 { margin: 28px 0 12px; }
.cfp-main h3:first-child { margin-top: 0; }
.cfp-main p { font-size: var(--fs-base); max-width: none; margin-bottom: 12px; }
.cfp-main p:last-child { margin-bottom: 0; }
.cfp-main strong { color: var(--text); }

/* Shared list style — used by Topics (one column) and Program Committee (two columns).
   Every item gets its own tight underline, sized to its content, instead of a row divider. */
.styled-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 32px;
  margin-top: 12px;
  list-style: none;
}
.styled-list.one-col { grid-template-columns: 1fr; }
.styled-list .item-text,
.styled-list .item-body {
  display: inline-block;
  padding-bottom: 5px;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}
.styled-list .item-text { font-size: var(--fs-md); color: var(--muted); }
.styled-list .item-name { font-family: 'Outfit', sans-serif; font-weight: 600; font-size: var(--fs-md); color: var(--text); }
.styled-list .item-affil { font-size: var(--fs-xs); color: var(--muted); }

/* Submission types */
.sub-types { margin-top: 16px; display: flex; flex-direction: column; gap: 10px; }
.sub-type {
  display: flex;
  gap: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 12px;
  padding: 13px 16px;
  box-shadow: var(--shadow);
}
.sub-type .pages {
  font-family: 'Outfit', sans-serif;
  font-size: var(--fs-2xs);
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--accent);
  white-space: nowrap;
  flex-shrink: 0;
  padding-top: 2px;
}
.sub-type-info h3 { font-size: var(--fs-md); margin-bottom: 3px; }
.sub-type-info p  { font-size: var(--fs-sm); max-width: none; }

/* Sidebar: dates + submission info */
.cfp-sidebar { position: sticky; top: calc(68px + env(safe-area-inset-top, 0px)); }
.sidebar-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}
.sidebar-box-head {
  font-family: 'Outfit', sans-serif;
  font-size: var(--fs-2xs);
  font-weight: 700;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
  padding: 11px 18px;
}
.date-row {
  display: flex;
  flex-direction: column;
  padding: 13px 18px;
  border-bottom: 1px solid var(--border);
}
.date-row:last-child { border-bottom: none; }
.date-name {
  font-family: 'Outfit', sans-serif;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text);
  margin-bottom: 2px;
}
.date-val {
  font-family: 'Outfit', sans-serif;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--warm);
  font-variant-numeric: tabular-nums;
}
.date-note {
  font-size: var(--fs-xs);
  color: var(--muted);
  padding: 10px 18px;
  max-width: none;
}

/* ── Program ─────────────────────────────────────────── */
.tentative-badge {
  font-family: 'Outfit', sans-serif;
  font-size: var(--fs-2xs);
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  background: var(--warm-bg);
  color: var(--warm);
  padding: 3px 9px;
  border-radius: 5px;
  margin-left: 10px;
  vertical-align: middle;
}
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 20px;
  padding: 12px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-family: 'Outfit', sans-serif;
  font-size: var(--fs-xs);
  font-weight: 500;
  color: var(--muted);
}
.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.schedule {
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.sched-row {
  display: grid;
  grid-template-columns: 128px 1fr;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  transition: background .13s;
}
.sched-row:last-child { border-bottom: none; }
.sched-row.is-break { background: var(--bg); }
.sched-time {
  font-family: 'Outfit', sans-serif;
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--muted);
  padding: 15px 14px 15px 18px;
  border-right: 1px solid var(--border);
  display: flex;
  align-items: center;
  font-variant-numeric: tabular-nums;
}
.sched-body {
  padding: 15px 20px;
  border-left: 3px solid transparent;
}
.sched-row.type-talk    .sched-body,
.sched-row.type-welcome .sched-body,
.sched-row.type-award   .sched-body { border-left-color: var(--accent); }
.sched-row.type-session .sched-body,
.sched-row.type-panel   .sched-body,
.sched-row.type-working .sched-body { border-left-color: #9B8FC4; }
.sched-body h3 { font-size: var(--fs-md); margin-bottom: 2px; }
.sched-body p  { font-size: var(--fs-sm); max-width: none; }
.sched-break-text { font-size: var(--fs-sm); color: var(--muted); font-weight: 400; }

/* ── Placeholder box (e.g. Accepted Papers) ───────────── */
.placeholder-box {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: 12px;
  padding: 20px 22px;
  box-shadow: var(--shadow);
}
.placeholder-box svg { flex-shrink: 0; margin-top: 1px; }
.placeholder-box p { font-size: var(--fs-base); max-width: none; margin: 0; }
.placeholder-box strong { color: var(--text); }
.placeholder-box + .placeholder-box { margin-top: 12px; }
.placeholder-box.is-pending svg { color: var(--muted); }
.placeholder-box.is-award svg { color: var(--warm); }

/* ── Footer ──────────────────────────────────────────── */
footer {
  background: var(--hero-bg);
  padding: 32px clamp(20px, 5vw, calc((100vw - 1120px) / 2));
  display: flex;
  flex-wrap: wrap;
  gap: 8px 40px;
  justify-content: space-between;
  align-items: center;
}
footer p { font-family: 'Outfit', sans-serif; font-size: var(--fs-sm); color: var(--hero-muted); max-width: none; }
footer a { color: var(--hero-acc); }
footer strong { color: var(--hero-text); }
footer .brand-tag { color: var(--hero-muted); }

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 1280px) {
  .hero::before { opacity: .14; }
}
@media (max-width: 560px) {
  .hero::before { display: none; }
}
@media (max-width: 860px) {
  .cfp-layout { grid-template-columns: 1fr; }
  .cfp-sidebar { position: static; }
  .styled-list { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .sched-time { font-size: 12px; padding-inline: 12px 10px; }
  .sched-row { grid-template-columns: 95px 1fr; }
  h1 { font-size: 2rem; }
}
@media (max-width: 480px) {
  .hero { padding-block: 52px; }
  .org-card { flex-direction: column; text-align: center; }
  .org-affil { text-align: center; }
}