:root {
  /* Brand palette */
  --c-teal: #1cbcbc;
  --c-purple: #5f5ef9;
  --c-mint: #00dd9f;
  --c-yellow: #ffc000;
  --c-red: #ca3f59;

  /* Neutrals */
  --c-text: #0f172a; /* slate-900-ish */
  --c-text-muted: rgba(15, 23, 42, 0.62);
  --c-border: rgba(15, 23, 42, 0.10);
  --c-surface: #ffffff;
  --c-surface-2: #f6f7fb;

  /* Gradients (bold but controlled) */
  --g-brand: radial-gradient(1200px circle at 50% 10%, rgba(95, 94, 249, 0.25) 0%, rgba(28, 188, 188, 0.18) 35%, rgba(0, 221, 159, 0.12) 70%, rgba(255, 255, 255, 0) 100%);
  --g-cta: linear-gradient(135deg, var(--c-teal) 0%, #5a87e2 48%, var(--c-purple) 100%);
  --g-cta-2: linear-gradient(135deg, var(--c-mint) 0%, var(--c-teal) 55%, var(--c-purple) 100%);

  /* Radii */
  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 18px;
  --r-pill: 9999px;

  /* Shadows */
  --sh-sm: 0 6px 18px rgba(15, 23, 42, 0.08);
  --sh-md: 0 10px 30px rgba(15, 23, 42, 0.10);
  --sh-lg: 0 18px 50px rgba(15, 23, 42, 0.14);

  /* Spacing rhythm */
  --container: 1120px;
  --px: 20px;
  --py-section: 72px;
  --py-section-lg: 104px;

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-soft: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-1: 140ms;
  --dur-2: 220ms;
  --dur-3: 320ms;

  /* Focus */
  --ring: 0 0 0 3px rgba(28, 188, 188, 0.25);

  /* Past circles photo overlay: linear gradient (teal → purple), full image */
  --g-photo-teal: rgba(28, 188, 188, 0.72);
  --g-photo-purple: rgba(95, 94, 249, 0.68);
}

.past-circle-photo-gradient {
  opacity: 0.52;
  transition: opacity var(--dur-3) var(--ease-soft);
}
.group:hover .past-circle-photo-gradient {
  opacity: 0.34;
}
/* Each image: linear gradient edge-to-edge so full image is covered (no gap in middle) */
.past-circle-photo-gradient-0 {
  background: linear-gradient(135deg, var(--g-photo-teal) 0%, rgba(28, 188, 188, 0.4) 25%, rgba(95, 94, 249, 0.4) 75%, var(--g-photo-purple) 100%);
}
.past-circle-photo-gradient-1 {
  background: linear-gradient(315deg, var(--g-photo-teal) 0%, rgba(28, 188, 188, 0.4) 25%, rgba(95, 94, 249, 0.4) 75%, var(--g-photo-purple) 100%);
}
.past-circle-photo-gradient-2 {
  background: linear-gradient(180deg, var(--g-photo-teal) 0%, rgba(28, 188, 188, 0.4) 25%, rgba(95, 94, 249, 0.4) 75%, var(--g-photo-purple) 100%);
}
.past-circle-photo-gradient-3 {
  background: linear-gradient(90deg, var(--g-photo-teal) 0%, rgba(28, 188, 188, 0.4) 25%, rgba(95, 94, 249, 0.4) 75%, var(--g-photo-purple) 100%);
}

/* Past Circles gallery refresh */
.ui-past-circles {
  position: relative;
}
.ui-past-header .ui-lead {
  max-width: 54ch;
}
.ui-past-events {
  display: grid;
  gap: clamp(40px, 6vw, 60px);
}
.ui-past-event {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(246, 247, 251, 0.6));
  border: 1px solid rgba(15, 23, 42, 0.07);
  border-radius: 20px;
  padding: clamp(16px, 2.5vw, 26px);
}
.ui-past-event--featured {
  border-color: rgba(28, 188, 188, 0.28);
  box-shadow: 0 14px 36px rgba(15, 23, 42, 0.10);
}
.ui-past-event-head {
  display: flex;
  align-items: center;
  gap: 16px;
}
.ui-past-event-head::after {
  content: "";
  height: 1px;
  flex: 1;
  background: linear-gradient(90deg, rgba(95, 94, 249, 0.28), rgba(28, 188, 188, 0.16), rgba(15, 23, 42, 0));
}
[dir="rtl"] .ui-past-event-head::after {
  background: linear-gradient(270deg, rgba(95, 94, 249, 0.28), rgba(28, 188, 188, 0.16), rgba(15, 23, 42, 0));
}
.ui-past-event-title {
  margin: 0;
  color: var(--c-text);
  font-size: clamp(22px, 2.2vw, 28px);
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.ui-past-event--featured .ui-past-event-title {
  font-size: clamp(24px, 2.4vw, 32px);
  font-weight: 850;
}
.ui-past-photo-card {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 0;
  text-align: inherit;
  cursor: zoom-in;
  border-radius: 16px;
  overflow: hidden;
  isolation: isolate;
}
.ui-past-photo-card:focus-visible {
  outline: none;
  box-shadow: var(--ring);
}
.ui-past-photo-media {
  position: relative;
  overflow: hidden;
  border-radius: inherit;
  background: #e7ebf3;
}
.ui-past-photo-card--lead .ui-past-photo-media {
  min-height: clamp(220px, 28vw, 360px);
}
/* Portrait card (e.g. second in featured row): fill height so image is not cropped */
.ui-past-photo-card--portrait .ui-past-photo-media {
  aspect-ratio: 3/4;
}
@media (min-width: 1024px) {
  .ui-past-photo-grid:has(.ui-past-photo-card--lead) .ui-past-photo-card--portrait {
    align-self: stretch;
  }
  .ui-past-photo-grid:has(.ui-past-photo-card--lead) .ui-past-photo-card--portrait .ui-past-photo-media {
    aspect-ratio: auto;
    min-height: 100%;
    height: 100%;
  }
}
.ui-past-photo-image {
  transform: scale(1.015);
  transition: transform 560ms var(--ease-soft), filter var(--dur-3) var(--ease-out);
  filter: saturate(0.96) contrast(1.02);
}
.ui-past-photo-shine {
  opacity: 0;
  background: linear-gradient(120deg, rgba(255, 255, 255, 0) 35%, rgba(255, 255, 255, 0.24) 52%, rgba(255, 255, 255, 0) 68%);
  transform: translateX(-26%);
  transition: opacity var(--dur-2) var(--ease-out), transform 620ms var(--ease-soft);
}
.ui-past-photo-card:hover .ui-past-photo-image {
  transform: scale(1.075);
  filter: saturate(1.02) contrast(1.04);
}
.ui-past-photo-card:hover .ui-past-photo-shine {
  opacity: 1;
  transform: translateX(18%);
}
.ui-past-video-image {
  transition: transform 520ms var(--ease-soft), filter var(--dur-3) var(--ease-out);
}
.ui-past-video-card:hover .ui-past-video-image {
  transform: scale(1.06);
  filter: saturate(1.02) contrast(1.04);
}
@media (max-width: 639px) {
  .ui-past-event-head {
    gap: 10px;
  }
  .ui-past-event-title {
    white-space: normal;
  }
  .ui-past-photo-card--lead .ui-past-photo-media {
    min-height: 0;
  }
}

@media (min-width: 640px) {
  :root { --px: 40px; }
}

/* Base */
html { text-rendering: optimizeLegibility; }
body {
  color: var(--c-text);
  background: var(--c-surface);
}
body::before {
  content: "";
  position: fixed;
  inset: -20%;
  background: var(--g-brand);
  pointer-events: none;
  z-index: -1;
}

/* Centered container + section rhythm */
.ui-container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--px);
  padding-right: var(--px);
}
.ui-section {
  padding: var(--py-section) 0;
}
@media (min-width: 1024px) {
  .ui-section { padding: var(--py-section-lg) 0; }
}
.ui-section-alt {
  background: var(--c-surface-2);
}

/* Language-aware alignment helpers (layout centered, text follows dir) */
[dir="rtl"] .ui-text { text-align: right; }
[dir="ltr"] .ui-text { text-align: left; }

/* Type scale (keeps your Tailwind sizes usable but standardizes when used) */
.ui-h1 {
  font-size: clamp(34px, 4.6vw, 56px);
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.ui-h2 {
  font-size: clamp(26px, 3vw, 34px);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.015em;
}
.ui-lead {
  font-size: 18px;
  line-height: 1.75;
  color: var(--c-text-muted);
}
.ui-muted { color: var(--c-text-muted); }

/* Buttons */
.ui-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border-radius: var(--r-pill);
  padding: 12px 18px;
  font-weight: 700;
  line-height: 1;
  transition: transform var(--dur-2) var(--ease-out), box-shadow var(--dur-2) var(--ease-out), filter var(--dur-2) var(--ease-out), background var(--dur-2) var(--ease-out), color var(--dur-2) var(--ease-out), border-color var(--dur-2) var(--ease-out);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.ui-btn:focus-visible { outline: none; box-shadow: var(--ring); }
.ui-btn:active { transform: translateY(0) scale(0.99); }

.ui-btn-primary {
  color: rgba(255, 255, 255, 0.98);
  background: var(--g-cta);
  box-shadow: 0 10px 26px rgba(95, 94, 249, 0.20), 0 10px 26px rgba(28, 188, 188, 0.18);
}
.ui-btn-primary:hover { filter: brightness(1.02); transform: translateY(-1px); }

.ui-btn-secondary {
  color: rgba(255, 255, 255, 0.98);
  background: var(--g-cta-2);
  box-shadow: 0 10px 26px rgba(0, 221, 159, 0.16), 0 10px 26px rgba(28, 188, 188, 0.16);
}
.ui-btn-secondary:hover { filter: brightness(1.02); transform: translateY(-1px); }

.ui-btn-ghost {
  color: var(--c-text);
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--c-border);
}
.ui-btn-ghost:hover { background: rgba(255, 255, 255, 0.9); transform: translateY(-1px); }

/* Cards */
.ui-card {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-sm);
  transition: transform var(--dur-2) var(--ease-out), box-shadow var(--dur-2) var(--ease-out), border-color var(--dur-2) var(--ease-out);
}
.ui-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--sh-md);
  border-color: rgba(28, 188, 188, 0.22);
}

/* If legacy `.card` is present, soften its hover jump */
.ui-card.card {
  box-shadow: var(--sh-sm);
  border: 1px solid var(--c-border);
}
.ui-card.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--sh-md);
}

/* Speakers / Presenter cards */
.ui-speaker-card {
  display: flex;
  align-items: stretch;
  overflow: hidden;
  cursor: pointer;
  position: relative;
}
.ui-speaker-card:focus-visible {
  outline: none;
  box-shadow: var(--ring);
}
.ui-speaker-body {
  flex: 1;
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 10px;
}
@media (min-width: 1024px) {
  .ui-speaker-body { padding: 34px; }
}
.ui-speaker-name {
  font-size: clamp(24px, 2.2vw, 30px);
  line-height: 1.25;
  font-weight: 850;
  letter-spacing: -0.01em;
  color: var(--c-text);
  margin: 0;
}
.ui-speaker-title {
  margin: 0;
  color: var(--c-teal);
  font-weight: 800;
}
.ui-speaker-bio {
  margin: 0;
  color: var(--c-text-muted);
  line-height: 1.85;
}
.ui-speaker-bio.ui-clamp-4 {
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.ui-speaker-divider {
  width: 1px;
  opacity: 0.75;
  background: linear-gradient(
    180deg,
    rgba(15, 23, 42, 0) 0%,
    rgba(15, 23, 42, 0.10) 18%,
    rgba(28, 188, 188, 0.28) 50%,
    rgba(15, 23, 42, 0.10) 82%,
    rgba(15, 23, 42, 0) 100%
  );
}
.ui-speaker-imageWrap {
  flex-shrink: 0;
  width: 240px;
  min-height: 260px;
  background: rgba(15, 23, 42, 0.04);
  position: relative;
  overflow: hidden;
}
@media (min-width: 640px) {
  .ui-speaker-imageWrap { width: 300px; }
}
@media (min-width: 1024px) {
  .ui-speaker-imageWrap { width: 420px; min-height: 320px; }
}
.ui-speaker-imageWrap::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.18;
  background: linear-gradient(135deg, rgba(28, 188, 188, 0.22), rgba(95, 94, 249, 0.18));
  transition: opacity var(--dur-3) var(--ease-out);
}
.ui-speaker-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transform: scale(1.001);
  transition: transform var(--dur-3) var(--ease-out), filter var(--dur-3) var(--ease-out);
  will-change: transform;
}
.ui-speaker-card:hover .ui-speaker-image { transform: scale(1.04); }
.ui-speaker-card:hover .ui-speaker-imageWrap::before { opacity: 0.10; }

.ui-speaker-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
  font-weight: 850;
  color: var(--c-teal);
  text-decoration: none;
}
.ui-speaker-cta svg {
  transition: transform var(--dur-2) var(--ease-out);
}
[dir="ltr"] .ui-speaker-card:hover .ui-speaker-cta svg { transform: translateX(3px); }
[dir="rtl"] .ui-speaker-card:hover .ui-speaker-cta svg { transform: translateX(-3px); }

/* Speaker tiles (multi-speaker grid) */
.ui-speaker-tile {
  text-align: center;
}
.ui-speaker-avatar {
  width: 132px;
  height: 132px;
  border-radius: 9999px;
  overflow: hidden;
  background: rgba(15, 23, 42, 0.06);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.10);
  border: 1px solid rgba(15, 23, 42, 0.06);
}
.ui-speaker-avatarInner {
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  transform: scale(1.001);
  transition: transform var(--dur-3) var(--ease-out);
}
.ui-speaker-tile:hover .ui-speaker-avatarInner { transform: scale(1.05); }

/* Speakers: mobile layout and touch targets */
@media (max-width: 767px) {
  /* Horizontal speaker/moderator cards: stack with image on top */
  .speaker-card-mobile-stack {
    flex-direction: column !important;
  }
  .speaker-card-mobile-stack .flex-shrink-0 {
    width: 100% !important;
    min-height: 0;
    aspect-ratio: 4/3;
  }
  .speaker-card-mobile-stack .flex-shrink-0 img,
  .speaker-card-mobile-stack .flex-shrink-0 > div {
    width: 100%;
    height: 100%;
    min-height: 200px;
    object-fit: cover;
  }
  .speaker-card-mobile-stack .flex-1 {
    order: 2;
    padding: 20px !important;
  }
  .speaker-card-mobile-stack .flex-shrink-0 {
    order: 1;
  }
  /* ui-speaker-card component: same stacking when used */
  .ui-speaker-card {
    flex-direction: column;
  }
  .ui-speaker-body {
    order: 2;
    padding: 20px;
  }
  .ui-speaker-imageWrap {
    order: 1;
    width: 100%;
    min-height: 0;
    aspect-ratio: 4/3;
  }
  .ui-speaker-divider {
    width: 100%;
    height: 1px;
    order: 1;
    flex: none;
  }
  /* Tiles: tighter gap, larger tap area */
  .ui-speaker-tile .ui-speaker-avatar {
    width: 120px;
    height: 120px;
  }
}

/* Touch targets for speaker CTAs (min 44px) */
.ui-speaker-cta,
button.ui-speaker-cta,
.speaker-card-mobile-stack button[type="button"].text-teal,
.ui-speaker-tile button[type="button"].text-teal {
  min-height: 44px;
  padding: 10px 4px;
  -webkit-tap-highlight-color: transparent;
}
@media (max-width: 767px) {
  .ui-speaker-tile {
    padding: 20px 16px;
  }
  .ui-speaker-tile .ui-speaker-avatar {
    margin-bottom: 12px;
  }
}

/* Nav */
.ui-header {
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
}
.ui-nav {
  display: flex;
  align-items: center;
  gap: 18px;
}
.ui-nav-link {
  position: relative;
  padding: 10px 10px;
  border-radius: 12px;
  color: rgba(15, 23, 42, 0.74);
  font-weight: 700;
  transition: background var(--dur-2) var(--ease-out), color var(--dur-2) var(--ease-out);
  outline: none;
}
.ui-nav-link:hover { background: rgba(15, 23, 42, 0.04); color: rgba(15, 23, 42, 0.95); }
.ui-nav-link:focus-visible { box-shadow: var(--ring); }
.ui-nav-link.ui-active {
  color: rgba(15, 23, 42, 0.98);
}
.ui-nav-link.ui-active::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 6px;
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--c-teal), var(--c-purple));
}

/* Header on-load animation */
.header-initial {
  opacity: 0;
  transform: translateY(-12px);
  transition: opacity var(--dur-3) var(--ease-out), transform var(--dur-3) var(--ease-out);
}
.header-initial.header-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Mobile menu: smooth expand/collapse */
.mobile-menu-transition {
  max-height: 0;
  opacity: 0;
  visibility: hidden;
  transition: max-height 360ms var(--ease-soft), opacity var(--dur-2) var(--ease-out), visibility var(--dur-2);
}
.mobile-menu-transition.mobile-menu-open {
  max-height: 320px;
  opacity: 1;
  visibility: visible;
}

/* Modal open/close transition */
.modal-backdrop {
  opacity: 0;
  transition: opacity var(--dur-2) var(--ease-out);
}
.modal-backdrop.modal-open { opacity: 1; }
.modal-content-wrap {
  opacity: 0;
  transform: scale(0.97);
  transition: opacity var(--dur-2) var(--ease-out), transform var(--dur-2) var(--ease-out);
}
.modal-backdrop.modal-open .modal-content-wrap {
  opacity: 1;
  transform: scale(1);
}

/* FAQ accordion: smooth height + opacity */
.faq-answer-animated {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--dur-3) var(--ease-soft);
}
.faq-answer-animated.faq-open { grid-template-rows: 1fr; }
.faq-answer-animated > div { overflow: hidden; min-height: 0; }
.faq-answer-animated .faq-answer-inner {
  opacity: 0;
  transition: opacity var(--dur-2) var(--ease-out);
}
.faq-answer-animated.faq-open .faq-answer-inner { opacity: 1; }

/* Focus polish for interactive FAQ rows */
.faq-question:focus-visible {
  outline: none;
  box-shadow: var(--ring);
  border-radius: 14px;
}

/* Countdown digit pop when value changes */
.countdown-digit-pop { animation: countdownPop 250ms var(--ease-out); }

/* Proximity motion (opt-in) */
[data-proximity] {
  --p: 0;
  --prox-ty: 10px;
  --prox-scale: 0.985;
  will-change: transform, filter;
}
[data-proximity].prox-ready {
  transform: translateY(calc((1 - var(--p)) * var(--prox-ty))) scale(calc(var(--prox-scale) + var(--p) * (1 - var(--prox-scale))));
  filter: blur(calc((1 - var(--p)) * 0.6px));
}
/* Past-circles: no proximity so image stagger is the only scroll effect */
[data-past-circles][data-proximity].prox-ready {
  transform: none;
  filter: none;
}

@media (prefers-reduced-motion: reduce) {
  .ui-btn, .ui-card, .ui-nav-link { transition: none !important; }
  .ui-speaker-image, .ui-speaker-imageWrap::before, .ui-speaker-avatarInner, .ui-speaker-cta svg { transition: none !important; }
  .ui-past-photo-image, .ui-past-photo-shine, .past-circle-photo-gradient, .ui-past-video-image { transition: none !important; }
  .ui-past-photo-card:hover .ui-past-photo-image, .ui-past-video-card:hover .ui-past-video-image { transform: none !important; filter: none !important; }
  .ui-past-photo-card:hover .ui-past-photo-shine { opacity: 0 !important; transform: none !important; }
  [data-proximity] { transform: none !important; filter: none !important; }
  .header-initial, .header-initial.header-visible { opacity: 1; transform: none; }
  .mobile-menu-transition, .modal-backdrop, .modal-content-wrap, .faq-answer-animated { transition: none !important; }
  .countdown-digit-pop { animation: none !important; }
}