/* ============ MIC 2026 Design Tokens ============ */
:root {
  --color-primary: #1E40AF;
  --color-primary-light: #2563EB;
  --color-primary-dark: #14235A;
  --color-footer-bg: #1F2937;
  --color-accent: #1D4ED8;
  --color-accent-hover: #1E3A8A;
  --color-accent-light: #93C5FD;
  --color-bg: #F9FAFB;
  --color-surface: #FFFFFF;
  --color-surface-alt: #F3F4F6;
  --color-fg: #111827;
  --color-fg-muted: #4B5563;
  --color-border: #E5E7EB;
  --color-on-primary: #FFFFFF;
  --color-on-accent: #FFFFFF;

  --font-serif: 'Crimson Pro', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
  --space-7: 96px;

  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --radius-pill: 999px;

  --shadow-sm: 0 1px 3px rgba(20, 38, 74, 0.08);
  --shadow-md: 0 8px 24px rgba(20, 38, 74, 0.10);
  --shadow-lg: 0 24px 60px rgba(20, 38, 74, 0.16);

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 180ms;
  --dur-base: 260ms;
  --dur-slow: 420ms;

  --header-h: 76px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0F1521;
    --color-surface: #1A2333;
    --color-surface-alt: #151D2B;
    --color-fg: #F3F4F6;
    --color-fg-muted: #9CA3AF;
    --color-border: #2D3748;
    --color-primary: #3B63C4;
    --color-primary-light: #5B85DE;
    --color-accent: #3B82F6;
    --color-accent-light: #93C5FD;
    --color-on-primary: #FFFFFF;
  }
}

/* ============ Reset ============ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 var(--space-2);
  color: var(--color-primary);
}
@media (prefers-color-scheme: dark) { h1, h2, h3, h4 { color: #DCE7FA; } }

p { margin: 0 0 var(--space-2); color: var(--color-fg); }
ul, ol { margin: 0; padding: 0; }
a { color: inherit; }
img, svg { display: block; max-width: 100%; }

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-3);
}

/* Focus visibility */
a:focus-visible, button:focus-visible, iframe:focus-visible {
  outline: 3px solid var(--color-accent-light);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -60px;
  background: var(--color-primary);
  color: #fff;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  z-index: 1000;
  transition: top var(--dur-base) var(--ease-out);
}
.skip-link:focus { top: var(--space-2); }

/* ============ Header / Tabs ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 14px 0;
  background: transparent;
}

.header-inner {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-3);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.pill-card {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}
@media (prefers-color-scheme: dark) {
  .pill-card { background: rgba(22, 32, 58, 0.92); }
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  text-decoration: none;
  color: var(--color-primary);
  flex-shrink: 0;
  cursor: pointer;
  padding: 10px 18px 10px 12px;
}
.brand-mark { display: flex; }
.brand-text { display: flex; flex-direction: column; line-height: 1.05; }
.brand-title { font-family: var(--font-serif); font-weight: 700; font-size: 19px; letter-spacing: 0.02em; }
.brand-subtitle { font-size: 11px; letter-spacing: 0.12em; color: var(--color-accent); font-weight: 600; }

.nav-pill {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 8px 8px 8px 16px;
  flex: 1;
  min-width: 0;
  max-width: 720px;
  justify-content: space-between;
}

.tab-nav {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  min-width: 0;
  scrollbar-width: none;
}
.tab-nav::-webkit-scrollbar { display: none; }

.tab-btn {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--color-fg-muted);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  white-space: nowrap;
  transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
  min-height: 44px;
}
.tab-btn:hover { color: var(--color-primary); background: var(--color-surface-alt); }
.tab-btn[aria-selected="true"] {
  color: var(--color-primary);
  background: var(--color-surface-alt);
}
@media (prefers-color-scheme: dark) {
  .tab-btn[aria-selected="true"] { color: #DCE7FA; }
}

.btn-header-cta { display: none; }
@media (min-width: 720px) {
  .btn-header-cta { display: inline-flex; flex-shrink: 0; }
}

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 12px 22px;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.btn:active { transform: scale(0.97); }
.btn-lg { padding: 14px 28px; font-size: 16px; }

.btn-accent {
  background: var(--color-accent);
  color: var(--color-on-accent);
  box-shadow: var(--shadow-sm);
}
.btn-accent:hover { background: var(--color-accent-hover); box-shadow: var(--shadow-md); }

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-border);
}
.btn-ghost:hover { background: var(--color-surface-alt); }
@media (prefers-color-scheme: dark) { .btn-ghost { color: #DCE7FA; } }

.btn-outline {
  background: var(--color-surface);
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-outline:hover { background: var(--color-primary); color: #fff; }
@media (prefers-color-scheme: dark) {
  .btn-outline { color: #DCE7FA; border-color: #DCE7FA; }
  .btn-outline:hover { background: #DCE7FA; color: var(--color-primary-dark); }
}

.icon { width: 18px; height: 18px; flex-shrink: 0; }
.icon-sm { width: 15px; height: 15px; }

/* ============ Tab Panels & Reveal Animation ============ */
.tab-panel[hidden] { display: none; }
.tab-panel { animation: panelIn var(--dur-slow) var(--ease-out); }
@keyframes panelIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

[data-animate] { opacity: 0; transform: translateY(24px); transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out); }
[data-animate].in-view { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  [data-animate] { opacity: 1; transform: none; transition: none; }
  .tab-panel { animation: none; }
}

/* ============ Hero ============ */
.hero {
  position: relative;
  overflow: hidden;
  padding: var(--space-7) 0 var(--space-6);
  margin-top: -14px;
  color: #fff;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(1100px 600px at 82% -10%, rgba(37, 99, 235, 0.35), transparent 60%),
    radial-gradient(900px 700px at 10% 110%, rgba(29, 78, 216, 0.45), transparent 60%),
    linear-gradient(155deg, var(--color-primary-dark) 0%, var(--color-primary) 55%, var(--color-primary-light) 100%);
}

.hero-mask {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(15, 38, 71, 0) 0%, rgba(15, 38, 71, 0) 55%, rgba(15, 38, 71, 0.55) 100%);
  pointer-events: none;
}

.hero-link { color: var(--color-accent-light); text-decoration: underline; text-underline-offset: 2px; }

.hero-motif { position: absolute; inset: 0; pointer-events: none; opacity: 0.16; }
.hex { position: absolute; width: 140px; fill: none; stroke: var(--color-accent-light); stroke-width: 1.4; }
.hex-1 { top: 10%; left: 6%; width: 90px; animation: floatY 9s ease-in-out infinite; }
.hex-2 { bottom: 12%; right: 10%; width: 160px; animation: floatY 12s ease-in-out infinite reverse; }
.hex-3 { top: 55%; left: 42%; width: 60px; animation: floatY 7s ease-in-out infinite; }
.molecule { position: absolute; top: 8%; right: 6%; width: 220px; stroke: var(--color-accent-light); stroke-width: 1.4; fill: var(--color-accent-light); }
@keyframes floatY { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-16px); } }
@media (prefers-reduced-motion: reduce) { .hex, .molecule { animation: none; } }

.hero-inner { position: relative; text-align: center; }
.eyebrow {
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent-light);
  font-weight: 700;
  margin-bottom: var(--space-2);
}
.hero-title {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(34px, 6vw, 62px);
  color: #fff;
  margin-bottom: var(--space-2);
  letter-spacing: -0.02em;
  line-height: 1.08;
}
.hero-subtitle {
  font-family: var(--font-serif);
  font-size: clamp(17px, 2.2vw, 21px);
  color: var(--color-accent-light);
  margin-bottom: var(--space-3);
}
.hero-desc {
  max-width: 640px;
  margin: 0 auto var(--space-4);
  color: rgba(255,255,255,0.85);
  font-size: 17px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.meta-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.18);
  padding: 9px 16px;
  border-radius: 999px;
  font-size: 14px;
  color: #fff;
}
.meta-chip .icon { color: var(--color-accent-light); }

.hero-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-2); }
.hero .btn-ghost { color: #fff; border-color: rgba(255,255,255,0.4); }
.hero .btn-ghost:hover { background: rgba(255,255,255,0.1); }

/* ============ Sections ============ */
.section { padding: var(--space-6) 0; }
.section-alt { background: var(--color-surface-alt); }
.section-title { font-size: clamp(26px, 4vw, 36px); text-align: center; margin-bottom: var(--space-4); }

.page-head { padding-bottom: var(--space-3); }
.page-title { font-size: clamp(32px, 5vw, 48px); }
.page-lede { font-size: 18px; color: var(--color-fg-muted); max-width: 640px; }
.agenda-note {
  display: inline-block;
  margin-top: var(--space-1);
  font-size: 14px;
  color: var(--color-accent);
  background: rgba(29,78,216,0.1);
  padding: 6px 14px;
  border-radius: 999px;
  font-weight: 600;
}

/* ============ About ============ */
.about-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: var(--space-5);
  align-items: start;
}
.about-text { font-size: 17px; color: var(--color-fg-muted); }
.about-text strong { color: var(--color-fg); }

.award-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow-sm);
  text-align: center;
}
.award-icon { width: 40px; height: 40px; margin: 0 auto var(--space-2); color: var(--color-accent); }
.award-card h3 { font-size: 19px; }
.award-card p { color: var(--color-fg-muted); font-size: 15px; margin: 0; }

@media (max-width: 860px) {
  .about-grid { grid-template-columns: 1fr; }
}

/* ============ Info Cards ============ */
.info-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-3);
}
.info-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}
.info-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.info-card-label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 8px;
}
.info-card p { margin: 0; color: var(--color-fg); font-size: 15px; }

/* ============ CTA Band ============ */
.cta-band {
  background: var(--color-primary);
  color: #fff;
}
.cta-band-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}
.cta-title { color: #fff; text-align: left; margin-bottom: var(--space-1); font-size: clamp(22px, 3vw, 30px); }
.cta-text { color: rgba(255,255,255,0.8); max-width: 420px; margin: 0; font-size: 15px; }

.countdown { display: flex; gap: var(--space-2); }
.countdown-unit {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  min-width: 64px;
}
.countdown-num { font-family: var(--font-serif); font-size: 26px; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--color-accent-light); }
.countdown-label { font-size: 11px; text-transform: uppercase; letter-spacing: 0.08em; color: rgba(255,255,255,0.7); }

/* ============ Registration ============ */
.reg-grid {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: var(--space-5);
  align-items: start;
}
@media (max-width: 900px) {
  .reg-grid { grid-template-columns: 1fr; }
}

.reg-info { position: sticky; top: calc(var(--header-h) + var(--space-3)); }
@media (max-width: 900px) { .reg-info { position: static; } }

.deadline-box {
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin-bottom: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.deadline-label { font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--color-accent-light); font-weight: 700; }
.deadline-date { font-family: var(--font-serif); font-size: 22px; font-weight: 600; }

.reg-steps-title { font-size: 19px; margin-bottom: var(--space-2); }
.steps-list { list-style: none; display: flex; flex-direction: column; gap: var(--space-3); margin-bottom: var(--space-3); }
.steps-list li { display: flex; gap: var(--space-2); }
.step-num {
  flex-shrink: 0;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--color-surface-alt);
  border: 1.5px solid var(--color-accent);
  color: var(--color-accent);
  font-family: var(--font-serif);
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.steps-list p { margin: 2px 0 0; color: var(--color-fg-muted); font-size: 14px; }
.steps-list a { color: var(--color-accent); text-decoration: underline; }

.reg-form-wrap { position: relative; min-height: 1200px; }
.reg-form-iframe {
  width: 100%;
  min-height: 1200px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  position: relative;
  z-index: 1;
  box-shadow: var(--shadow-sm);
}

.form-skeleton {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.shimmer-line {
  height: 16px;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--color-surface-alt) 25%, rgba(29,78,216,0.14) 37%, var(--color-surface-alt) 63%);
  background-size: 400% 100%;
  animation: shimmer 1.6s ease-in-out infinite;
}
@keyframes shimmer { 0% { background-position: 100% 0; } 100% { background-position: 0 0; } }
@media (prefers-reduced-motion: reduce) { .shimmer-line { animation: none; } }

/* ============ Abstracts ============ */
.abstracts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-3);
}
.abstract-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}
.abstract-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.abstract-card-accent { background: var(--color-primary); color: #fff; }
.abstract-card-accent h2 { color: #fff; }
.abstract-card-accent p { color: rgba(255,255,255,0.85); }
.abstract-card-accent .abstract-icon { color: var(--color-accent-light); }
.abstract-icon { width: 30px; height: 30px; color: var(--color-accent); margin-bottom: var(--space-1); }
.abstract-card h2 { font-size: 18px; margin-bottom: 6px; }
.abstract-card p { font-size: 14.5px; color: var(--color-fg-muted); margin: 0; }

/* ============ Presenter Booth Gallery ============ */
.gallery-section {
  background: var(--color-primary-dark);
  color: #fff;
}
.gallery-head { max-width: 680px; margin: 0 auto var(--space-4); text-align: center; }
.gallery-title {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  color: #fff;
  margin-bottom: var(--space-1);
}
.gallery-desc { color: rgba(255,255,255,0.72); font-size: 15px; }

.booth-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-3);
  /* Every row takes the height of the tallest card, so all cards match. */
  grid-auto-rows: 1fr;
}

.booth-grid-single {
  max-width: 320px;
  margin: 0 auto;
}

.booth-card { position: relative; display: flex; }

.booth-open {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  text-align: left;
  background: var(--color-surface);
  border: none;
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
  color: inherit;
  font-family: inherit;
}
.booth-open:hover, .booth-open:focus-visible { transform: translateY(-4px); box-shadow: var(--shadow-lg); }

.booth-card-featured .booth-open { border: 2px solid var(--color-accent); box-shadow: var(--shadow-lg); }

.booth-thumb {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 10 / 7;
  flex: none;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-surface-alt) 0%, #E4EAF5 100%);
  color: var(--color-primary);
}
.booth-thumb picture { display: block; width: 100%; height: 100%; }
.booth-thumb svg { width: 46%; }
.booth-thumb rect:first-child { fill: none; stroke: var(--color-border); stroke-width: 1.5; }
.booth-thumb-img { width: 100%; height: 100%; object-fit: cover; object-position: top center; display: block; }

.booth-body { padding: var(--space-2) var(--space-2) var(--space-3); display: flex; flex-direction: column; gap: 6px; flex: 1 1 auto; }
.booth-tag {
  align-self: flex-start;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(29,78,216,0.1);
  padding: 3px 10px;
  border-radius: 999px;
}
.booth-tag-featured { color: #fff; background: var(--color-accent); }
.booth-card-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 17px;
  color: var(--color-fg);
  line-height: 1.3;
  /* Long titles are truncated here; the modal shows them in full. */
  display: -webkit-box;
  -webkit-line-clamp: 4;
  line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.booth-card-authors {
  font-size: 13.5px;
  color: var(--color-fg-muted);
  margin-top: auto;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Booth number badge — mirrors the bookmark button, opposite corner. */
.booth-number {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
  min-width: 32px;
  height: 32px;
  padding: 0 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: var(--color-primary);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  box-shadow: var(--shadow-md);
  pointer-events: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.modal-abstract-note {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--color-border);
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--color-fg-muted);
  font-style: italic;
}

.modal-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.modal-booth-num {
  align-self: flex-start;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #fff;
  background: var(--color-primary);
  padding: 3px 10px;
  border-radius: 999px;
}

.booth-bookmark {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 2;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255,255,255,0.92);
  border: 1px solid var(--color-border);
  color: var(--color-fg-muted);
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.booth-bookmark:hover { color: var(--color-accent); }
.booth-bookmark[aria-pressed="true"] { color: var(--color-accent); }
.booth-bookmark[aria-pressed="true"] svg path { fill: currentColor; }
.booth-bookmark:active { transform: scale(0.92); }

@media (max-width: 640px) {
  .booth-grid { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
}

/* ---- Booth Modal ---- */
.booth-modal {
  border: none;
  border-radius: var(--radius-lg);
  padding: 0;
  max-width: 560px;
  width: calc(100% - 32px);
  box-shadow: var(--shadow-lg);
  color: var(--color-fg);
  background: var(--color-surface);
}
.booth-modal::backdrop { background: rgba(15, 23, 42, 0.6); backdrop-filter: blur(2px); }
.booth-modal[open] { animation: modalIn var(--dur-base) var(--ease-out); }
@keyframes modalIn { from { opacity: 0; transform: translateY(12px) scale(0.98); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .booth-modal[open] { animation: none; } }

.modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 2;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.92);
  color: var(--color-fg);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.modal-close:hover { background: #fff; }

.modal-thumb {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--color-surface-alt) 0%, #E4EAF5 100%);
  color: var(--color-primary);
}
.modal-thumb svg { width: 32%; }
.modal-thumb rect:first-child { fill: none; stroke: var(--color-border); stroke-width: 1.5; }
.modal-thumb-img { width: 100%; height: 100%; object-fit: contain; background: #fff; display: block; transition: filter .25s ease; }
/* Low-res stand-in while the full poster downloads. */
.modal-thumb-img.is-loading { filter: blur(1.5px); }
@media (prefers-reduced-motion: reduce) { .modal-thumb-img { transition: none; } }
.modal-thumb-link { display: block; width: 100%; height: 100%; }

.modal-body { padding: var(--space-4); }
.modal-body h3 { font-size: 22px; margin: 10px 0 6px; }
.modal-authors { font-size: 14.5px; color: var(--color-fg); font-weight: 600; margin: 0; }
.modal-school { font-size: 13.5px; color: var(--color-fg-muted); margin: 2px 0 var(--space-2); }
.modal-abstract { font-size: 15px; color: var(--color-fg-muted); margin: 0; }

.checklist { list-style: none; max-width: 620px; margin: 0 auto var(--space-4); display: flex; flex-direction: column; gap: var(--space-2); }
.checklist li {
  position: relative;
  padding-left: 32px;
  color: var(--color-fg);
  font-size: 15.5px;
}
.checklist li::before {
  content: "";
  position: absolute;
  left: 0; top: 2px;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--color-accent);
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round' d='M4 12l5 5L20 6'/%3E%3C/svg%3E") center/14px no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round' d='M4 12l5 5L20 6'/%3E%3C/svg%3E") center/14px no-repeat;
}
.section-alt .checklist { text-align: left; }
.section-alt > .container { text-align: center; }

/* ============ Agenda Timeline ============ */
.timeline { list-style: none; max-width: 720px; margin: 0 auto; position: relative; }
.timeline::before {
  content: "";
  position: absolute;
  left: 68px;
  top: 8px; bottom: 8px;
  width: 2px;
  background: var(--color-border);
}
.timeline-item {
  display: flex;
  gap: var(--space-3);
  position: relative;
  padding-bottom: var(--space-4);
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-time {
  flex-shrink: 0;
  width: 56px;
  text-align: right;
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--color-primary);
  padding-top: 2px;
}
.timeline-content {
  position: relative;
  padding-left: var(--space-3);
  border-left: 2px solid transparent;
}
.timeline-content::before {
  content: "";
  position: absolute;
  left: -5px; top: 6px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid var(--color-bg);
  box-shadow: 0 0 0 2px var(--color-accent);
}
.timeline-content h3 { font-size: 17px; margin-bottom: 2px; }
.timeline-content p { color: var(--color-fg-muted); font-size: 14.5px; margin: 0; }

.agenda-source-note { max-width: 720px; margin: -8px auto var(--space-4); font-size: 14px; color: var(--color-fg-muted); }
.agenda-source-note a { color: var(--color-accent); text-decoration: underline; }

.timeline-item-featured .timeline-content {
  background: rgba(29,78,216,0.08);
  border-radius: var(--radius-sm);
  padding: 10px var(--space-2);
  margin-left: -2px;
}
.timeline-item-featured .timeline-content::before { box-shadow: 0 0 0 3px var(--color-accent); }
.timeline-item-featured .timeline-time { color: var(--color-accent); }
.timeline-item-featured h3 { color: var(--color-accent); }

@media (max-width: 560px) {
  .timeline::before { left: 46px; }
  .timeline-time { width: 40px; font-size: 13px; }
}

/* ============ Footer ============ */
.site-footer {
  background: var(--color-footer-bg);
  color: rgba(255,255,255,0.75);
  padding: var(--space-4) 0;
  text-align: center;
  font-size: 14px;
}
.footer-inner p { margin: 0 0 6px; color: inherit; }
.footer-sub { font-size: 13px; color: rgba(255,255,255,0.55); }
.footer-sub a { color: var(--color-accent-light); text-decoration: underline; }
.footer-note { font-size: 12.5px; color: rgba(255,255,255,0.45); max-width: 520px; margin: 10px auto 0; }
.footer-note a { color: var(--color-accent-light); text-decoration: underline; }

@media (min-width: 720px) {
  .hero-desc { font-size: 18px; }
}

/* ---- Guest speaker ---- */
.speaker-card {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: var(--space-3);
}
.speaker-avatar {
  flex: none;
  width: 76px;
  height: 76px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.speaker-body { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.speaker-eyebrow {
  align-self: flex-start;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(29,78,216,0.1);
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 2px;
}
.speaker-name { font-family: var(--font-serif); font-size: 22px; font-weight: 600; margin: 0; color: var(--color-fg); }
.speaker-affil { margin: 0; font-size: 14.5px; color: var(--color-fg-muted); }
.speaker-talk-label {
  margin: 10px 0 0;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-fg-muted);
}
.speaker-talk { margin: 2px 0 0; font-size: 16px; line-height: 1.45; color: var(--color-fg); }

@media (max-width: 560px) {
  .speaker-card { flex-direction: column; align-items: center; text-align: center; }
  .speaker-body { align-items: center; }
  .speaker-eyebrow { align-self: center; }
}

.speaker-parallel {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--color-fg-muted);
  font-style: italic;
}
.timeline-badge {
  display: inline-block;
  vertical-align: middle;
  margin-left: 8px;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-style: normal;
  color: var(--color-accent);
  background: rgba(29,78,216,0.1);
  padding: 2px 8px;
  border-radius: 999px;
}

.timeline-time-end { display: block; font-weight: 500; opacity: 0.62; font-size: 0.92em; }
.timeline-time-end::before { content: "\2013 "; }