/* ASRP-BRIA 2026 — redesigned visual system */
:root {
  --bg: #ebe7df;
  --bg-warm: #f5f1ea;
  --bg-card: rgba(255, 252, 247, 0.92);
  --ink: #15202b;
  --ink-muted: #5a6b7a;
  --accent: #0e7490;
  --accent-bright: #22d3ee;
  --accent-soft: rgba(14, 116, 144, 0.12);
  --gold: #c2410c;
  --gold-bright: #fb923c;
  --gold-soft: #fed7aa;
  --hero-mid: #152238;
  --hero-deep: #0a0f18;
  --border: rgba(21, 32, 43, 0.1);
  --border-strong: rgba(34, 211, 238, 0.25);
  --shadow: 0 4px 24px rgba(10, 15, 24, 0.06);
  --shadow-float: 0 24px 48px rgba(10, 15, 24, 0.12);
  --header-h: 4rem;
  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "Outfit", system-ui, sans-serif;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --transition: 0.3s var(--ease-out);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  background-image: radial-gradient(
      ellipse 120% 80% at 10% -20%,
      rgba(254, 215, 170, 0.35),
      transparent 55%
    ),
    radial-gradient(ellipse 80% 50% at 90% 0%, rgba(186, 230, 253, 0.25), transparent 50%);
  padding-top: calc(var(--header-h) + env(safe-area-inset-top, 0px));
  padding-left: env(safe-area-inset-left, 0px);
  padding-right: env(safe-area-inset-right, 0px);
  display: flex;
  flex-direction: column;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition: color var(--transition);
}

a:hover {
  color: #0f766e;
}

/* ——— Header (dark glass) ——— */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  min-height: calc(var(--header-h) + env(safe-area-inset-top, 0px));
  padding-top: env(safe-area-inset-top, 0px);
  padding-left: env(safe-area-inset-left, 0px);
  padding-right: env(safe-area-inset-right, 0px);
  background: rgba(10, 15, 24, 0.78);
  backdrop-filter: blur(12px) saturate(1.15);
  -webkit-backdrop-filter: blur(12px) saturate(1.15);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  box-sizing: border-box;
}

.header-inner {
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 1.35rem;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(0.7rem, 2.1vw, 1.2rem);
  letter-spacing: 0.02em;
  color: #f1f5f9;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 1;
  min-width: 0;
  transition: color var(--transition), text-shadow var(--transition);
}

.brand:hover {
  color: #fff;
  text-shadow: 0 0 24px rgba(34, 211, 238, 0.45);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  min-width: 2.75rem;
  min-height: 2.75rem;
  padding: 0.5rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  cursor: pointer;
  border-radius: 8px;
  -webkit-tap-highlight-color: rgba(34, 211, 238, 0.15);
  touch-action: manipulation;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #e2e8f0;
  transition: var(--transition);
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  justify-content: flex-end;
  align-items: center;
}

.site-nav a {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(226, 232, 240, 0.72);
  text-decoration: none;
  padding: 0.45rem 0.75rem;
  position: relative;
  border-radius: 999px;
  transition: color var(--transition), background var(--transition), box-shadow var(--transition);
}

.site-nav a::after {
  display: none;
}

.site-nav a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.site-nav a[aria-current="page"] {
  color: #ecfeff;
  background: linear-gradient(
    135deg,
    rgba(34, 211, 238, 0.2),
    rgba(251, 146, 60, 0.15)
  );
  box-shadow: 0 0 0 1px rgba(34, 211, 238, 0.35), 0 8px 24px rgba(0, 0, 0, 0.2);
}

/* ——— Main ——— */
main {
  flex: 1;
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 2.75rem 1.35rem 3.75rem;
}

.page-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.85rem);
  font-weight: 700;
  color: var(--hero-mid);
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.page-lead {
  color: var(--ink-muted);
  max-width: 40rem;
  margin: 0 0 2rem;
  font-weight: 500;
}

.registration-page .page-title + .registration-cta-wrap {
  margin-top: 0.75rem;
}

.registration-cta-wrap {
  margin: 0 0 1.35rem;
}

.registration-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.95rem 2.15rem;
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: #f8fafc !important;
  background: linear-gradient(145deg, #0f172a 0%, #1e293b 45%, #0e7490 130%);
  border-radius: 14px;
  border: 1px solid rgba(34, 211, 238, 0.35);
  box-shadow: 0 10px 32px rgba(15, 23, 42, 0.25), 0 0 0 1px rgba(255, 255, 255, 0.06) inset;
  transition: transform 0.45s var(--ease-out), box-shadow var(--transition), border-color var(--transition);
}

.registration-cta:hover {
  transform: translateY(-3px);
  border-color: rgba(251, 191, 36, 0.45);
  box-shadow: 0 16px 40px rgba(14, 116, 144, 0.35), 0 0 0 1px rgba(255, 255, 255, 0.1) inset;
  text-decoration: none;
  color: #fff !important;
}

.registration-cta:focus-visible {
  outline: 2px solid var(--accent-bright);
  outline-offset: 3px;
}

.registration-contact {
  margin: 0 0 1.75rem;
  text-align: center;
}

.registration-mail {
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  letter-spacing: 0.01em;
  word-break: break-all;
}

.registration-mail:hover {
  color: #0f766e;
  text-decoration: none;
}

.registration-fee-card {
  max-width: 40rem;
  margin: 0 auto 0;
  text-align: left;
}

.registration-fee-card .content-card__title {
  margin-bottom: 0.85rem;
  font-size: clamp(1.35rem, 2.2vw, 1.75rem);
}

.registration-fee-lead {
  margin: 0 0 0.9rem;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--ink);
}

.registration-fee-list {
  margin: 0 0 1.35rem;
  padding-left: 1.25rem;
  font-size: 1.01rem;
  line-height: 1.58;
  color: var(--ink);
  list-style: disc;
}

.registration-fee-list li {
  margin-bottom: 0.4rem;
}

.registration-fee-list li:last-child {
  margin-bottom: 0;
}

.registration-fee-note {
  margin: 0;
  padding: 1.15rem 0 0;
  border-top: 1px solid rgba(14, 116, 144, 0.16);
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--ink-muted);
  font-weight: 500;
}

/* ——— Program / shared: PDF download pill ——— */
.materials-list__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.62rem 1.35rem;
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  color: #f8fafc !important;
  background: linear-gradient(145deg, #0f172a 0%, #1e293b 48%, #0e7490 125%);
  border-radius: 999px;
  border: 1px solid rgba(34, 211, 238, 0.35);
  box-shadow: 0 6px 22px rgba(15, 23, 42, 0.2), 0 0 0 1px rgba(255, 255, 255, 0.06) inset;
  transition: transform 0.45s var(--ease-out), box-shadow var(--transition), border-color var(--transition);
  flex-shrink: 0;
}

.materials-list__btn:hover {
  transform: translateY(-2px);
  border-color: rgba(251, 191, 36, 0.45);
  box-shadow: 0 12px 32px rgba(14, 116, 144, 0.3), 0 0 0 1px rgba(255, 255, 255, 0.08) inset;
  text-decoration: none;
  color: #fff !important;
}

.materials-list__btn:focus-visible {
  outline: 2px solid var(--accent-bright);
  outline-offset: 3px;
}

@media (max-width: 520px) {
  .program-section__download .materials-list__btn {
    width: 100%;
    max-width: 22rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .materials-list__btn {
    transition: none;
  }

  .materials-list__btn:hover {
    transform: none;
  }
}

/* ——— Downloads: program schedule ——— */
.program-section {
  position: relative;
  margin: 1.5rem 0 3.25rem;
  padding-top: 0.25rem;
}

.program-section__head {
  text-align: center;
  margin-bottom: 2rem;
  position: relative;
}

.program-section__head::after {
  content: "";
  display: block;
  width: min(100%, 420px);
  height: 3px;
  margin: 1.35rem auto 0;
  border-radius: 3px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(34, 211, 238, 0.45) 22%,
    rgba(251, 191, 36, 0.55) 50%,
    rgba(167, 139, 250, 0.4) 78%,
    transparent 100%
  );
  opacity: 0.95;
}

.program-section__eyebrow {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 0.5rem;
  opacity: 0.95;
}

.program-section__title {
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 3.5vw, 2.35rem);
  font-weight: 700;
  margin: 0 0 0.85rem;
  letter-spacing: -0.03em;
  background: linear-gradient(125deg, var(--hero-mid) 0%, var(--accent) 45%, #0f766e 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.program-section__tagline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.5rem 0.65rem;
  margin: 0;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-muted);
}

.program-section__download {
  margin-top: 1.35rem;
  display: flex;
  justify-content: center;
}

.program-section__pill {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.04);
  border: 1px solid rgba(14, 116, 144, 0.14);
  color: var(--hero-mid);
  letter-spacing: 0.03em;
}

.program-section__dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-bright), var(--gold-bright));
  opacity: 0.85;
  flex-shrink: 0;
}

.program-schedule {
  list-style: none;
  margin: 0 auto;
  padding: 4px 0 0;
  max-width: 52rem;
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid rgba(21, 32, 43, 0.1);
  box-shadow: 0 16px 48px rgba(15, 23, 42, 0.1), 0 1px 0 rgba(255, 255, 255, 0.9) inset;
  position: relative;
}

.program-schedule::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    #0e7490 0%,
    #22d3ee 35%,
    #fbbf24 65%,
    #a78bfa 100%
  );
  opacity: 0.88;
  pointer-events: none;
  z-index: 2;
}

.program-schedule__row {
  display: grid;
  grid-template-columns: minmax(10.5rem, 34%) 1fr;
  align-items: stretch;
  border-bottom: 1px solid rgba(21, 32, 43, 0.07);
  transition: background var(--transition), box-shadow var(--transition);
}

.program-schedule__row--last {
  border-bottom: none;
}

.program-schedule__row:hover {
  background: rgba(34, 211, 238, 0.04);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.program-schedule__date {
  margin: 0;
  padding: 1.05rem 1.15rem 1.05rem 1.35rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--hero-mid);
  background: linear-gradient(
    165deg,
    rgba(224, 242, 254, 0.92) 0%,
    rgba(204, 251, 241, 0.75) 55%,
    rgba(165, 243, 252, 0.55) 100%
  );
  border-right: 1px solid rgba(14, 116, 144, 0.12);
  transition: background 0.45s var(--ease-out), border-color var(--transition);
}

.program-schedule__row:hover .program-schedule__date {
  background: linear-gradient(
    165deg,
    rgba(207, 250, 254, 0.98) 0%,
    rgba(186, 230, 253, 0.88) 50%,
    rgba(165, 243, 252, 0.72) 100%
  );
  border-right-color: rgba(34, 211, 238, 0.28);
}

.program-schedule__place {
  display: inline;
  font-size: 0.92em;
  font-weight: 600;
  color: var(--accent);
  white-space: nowrap;
}

.program-schedule__address {
  display: block;
  margin-top: 0.45rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ink-muted);
  line-height: 1.4;
  max-width: 16rem;
}

.program-schedule__activity {
  margin: 0;
  padding: 1.05rem 1.35rem 1.05rem 1.25rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--hero-mid);
  background: linear-gradient(
    165deg,
    rgba(255, 252, 247, 0.99) 0%,
    rgba(248, 250, 252, 0.97) 100%
  );
  transition: background 0.45s var(--ease-out);
}

.program-schedule__row:hover .program-schedule__activity {
  background: linear-gradient(
    165deg,
    rgba(255, 252, 247, 1) 0%,
    rgba(240, 249, 255, 0.55) 100%
  );
}

.program-schedule__activity em {
  font-style: italic;
  font-weight: 500;
  color: var(--ink-muted);
  transition: color var(--transition);
}

.program-schedule__row:hover .program-schedule__activity em {
  color: var(--hero-mid);
}

@media (prefers-reduced-motion: reduce) {
  .program-schedule__row,
  .program-schedule__date,
  .program-schedule__activity,
  .program-schedule__activity em {
    transition: none;
  }
}

@media (max-width: 640px) {
  .program-schedule__row {
    grid-template-columns: 1fr;
  }

  .program-schedule__date {
    border-right: none;
    border-bottom: 1px solid rgba(14, 116, 144, 0.1);
    padding-bottom: 0.85rem;
  }

  .program-schedule__place {
    white-space: normal;
  }

  .program-schedule__activity {
    padding-top: 0.85rem;
  }

  .program-schedule__row:not(.program-schedule__row--last) .program-schedule__activity {
    border-bottom: 1px solid rgba(21, 32, 43, 0.07);
  }

  .program-schedule__row--last .program-schedule__date {
    border-bottom: 1px solid rgba(14, 116, 144, 0.1);
  }
}

.placeholder-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--shadow);
  color: var(--ink-muted);
}

.wrap--speakers {
  max-width: 1120px;
}

.wrap--gallery {
  max-width: 1180px;
}

.wrap--gallery .page-title {
  margin-bottom: 2.5rem;
  text-align: center;
}

.gallery-day-section {
  margin: 0 0 2.75rem;
  padding: 0 0 2.5rem;
  border-bottom: 1px solid rgba(14, 116, 144, 0.12);
}

.gallery-day-section:last-of-type {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0.25rem;
}

.gallery-day-section__head {
  position: relative;
  margin: 0 0 1.4rem;
  padding: 0.2rem 0 0.2rem 1.15rem;
}

.gallery-day-section__head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.1rem;
  bottom: 0.1rem;
  width: 4px;
  border-radius: 4px;
  background: linear-gradient(180deg, #0e7490, #22d3ee, #f59e0b);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.4);
}

.gallery-day-section__eyebrow {
  margin: 0 0 0.2rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #b45309;
  opacity: 0.9;
}

.gallery-day-section__title {
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 3.2vw, 2.1rem);
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.03em;
  line-height: 1.1;
  background: linear-gradient(120deg, var(--hero-mid) 0%, var(--accent) 42%, #0f766e 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.gallery-mosaic {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(15rem, 100%), 1fr));
  gap: 1rem 1.1rem;
  align-items: start;
}

.gallery-mosaic__cell {
  min-width: 0;
}

.gallery-thumb {
  position: relative;
  width: 100%;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid rgba(14, 116, 144, 0.14);
  background: linear-gradient(165deg, rgba(255, 252, 247, 0.6) 0%, rgba(241, 245, 249, 0.5) 100%);
  box-shadow: 0 10px 36px rgba(15, 23, 42, 0.08), 0 0 0 1px rgba(255, 255, 255, 0.7) inset;
  aspect-ratio: 4 / 3;
  transition: transform 0.4s var(--ease-out), box-shadow 0.4s var(--ease-out), border-color 0.35s;
}

.gallery-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
  transform: scale(1.001);
  transition: transform 0.55s var(--ease-out);
}

.gallery-thumb:hover,
.gallery-thumb:focus-visible {
  box-shadow: 0 20px 48px rgba(14, 116, 144, 0.16), 0 0 0 1px rgba(34, 211, 238, 0.25) inset;
  border-color: rgba(34, 211, 238, 0.3);
}

.gallery-thumb:hover img,
.gallery-thumb:focus-visible img {
  transform: scale(1.04);
}

@media (hover: none) and (pointer: coarse) {
  .gallery-thumb:active {
    box-shadow: 0 12px 32px rgba(14, 116, 144, 0.18), 0 0 0 1px rgba(34, 211, 238, 0.22) inset;
    border-color: rgba(34, 211, 238, 0.32);
  }
}

.gallery-thumb .tri-zoom__shine {
  border-radius: inherit;
  z-index: 2;
}

.gallery-thumb .tri-zoom__hint {
  z-index: 4;
}

@media (prefers-reduced-motion: reduce) {
  .gallery-thumb,
  .gallery-thumb img {
    transition: none;
  }

  .gallery-thumb:hover,
  .gallery-thumb:focus-visible,
  .gallery-thumb:hover img,
  .gallery-thumb:focus-visible img {
    transform: none;
  }
}

/* ——— General info hub & detail pages ——— */
.wrap--general {
  max-width: 1080px;
}

/* ——— History: OPTICS symposium timeline (history page) ——— */
.optics-history {
  margin: 2.5rem 0 0;
  padding: 2.5rem 0 0.5rem;
  border-top: 1px solid rgba(14, 116, 144, 0.15);
  position: relative;
}

.optics-history::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(100%, 720px);
  height: 4px;
  border-radius: 4px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(34, 211, 238, 0.4) 18%,
    rgba(194, 65, 12, 0.35) 50%,
    rgba(34, 211, 238, 0.4) 82%,
    transparent 100%
  );
  opacity: 0.9;
  pointer-events: none;
}

.optics-history__head {
  text-align: center;
  max-width: 44rem;
  margin: 0 auto 2.15rem;
}

.optics-history__eyebrow {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 0.45rem;
}

.optics-history__title {
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 2.8vw, 2.1rem);
  font-weight: 800;
  margin: 0 0 0.6rem;
  letter-spacing: -0.02em;
  line-height: 1.2;
  background: linear-gradient(125deg, var(--hero-mid) 0%, var(--accent) 48%, #0f766e 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.optics-history__intro {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--ink-muted);
  font-weight: 500;
}

.optics-timeline {
  list-style: none;
  margin: 0 auto;
  padding: 0 0.15rem;
  max-width: 52rem;
  position: relative;
}

.optics-timeline::before {
  content: "";
  position: absolute;
  top: 0.35rem;
  bottom: 0.35rem;
  left: 0.5rem;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--accent-bright), rgba(34, 211, 238, 0.25) 50%, var(--gold-bright));
  opacity: 0.55;
}

@media (min-width: 700px) {
  .optics-timeline {
    padding-left: 0.5rem;
  }
}

.optics-timeline__item {
  position: relative;
  padding: 0 0 0 1.5rem;
  margin-bottom: 1rem;
}

@media (min-width: 700px) {
  .optics-timeline__item {
    padding-left: 2.15rem;
  }
}

.optics-timeline__item:last-child {
  margin-bottom: 0;
}

.optics-timeline__card {
  position: relative;
  text-align: left;
  background: linear-gradient(165deg, rgba(255, 252, 247, 0.99) 0%, rgba(245, 248, 252, 0.97) 100%);
  border: 1px solid rgba(21, 32, 43, 0.09);
  border-left: 5px solid var(--accent-bright);
  border-radius: 16px 18px 18px 16px;
  padding: 1.15rem 1.2rem 1.25rem 1.35rem;
  box-shadow: 0 10px 36px rgba(15, 23, 42, 0.07), 0 1px 0 rgba(255, 255, 255, 0.9) inset;
  transition: transform 0.4s var(--ease-out), box-shadow var(--transition), border-color var(--transition);
}

.optics-timeline__card:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 44px rgba(15, 23, 42, 0.1), 0 1px 0 rgba(255, 255, 255, 0.95) inset;
  border-color: rgba(34, 211, 238, 0.22);
}

.optics-timeline__card--featured {
  border-left-width: 6px;
  background: linear-gradient(165deg, rgba(255, 250, 245, 0.99) 0%, rgba(240, 253, 250, 0.55) 100%);
  box-shadow: 0 12px 40px rgba(14, 116, 144, 0.1), 0 1px 0 rgba(255, 255, 255, 0.9) inset;
}

.optics-timeline__node {
  display: none;
}

.optics-timeline__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.65rem;
  padding: 0.28rem 0.6rem;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #fff;
  background: linear-gradient(125deg, #0e7490 0%, #155e75 50%, #164e63 100%);
  border-radius: 999px;
  margin: 0 0 0.5rem;
  box-shadow: 0 4px 14px rgba(14, 116, 144, 0.25);
}

.optics-timeline__card--featured .optics-timeline__badge {
  background: linear-gradient(125deg, #c2410c 0%, #ea580c 50%, #c2410c 100%);
}

.optics-timeline__heading {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
  margin: 0 0 0.4rem;
  letter-spacing: -0.01em;
}

.optics-timeline__subtitle {
  font-size: 0.9rem;
  line-height: 1.5;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 0.5rem;
  padding: 0.5rem 0 0;
  border-top: 1px dashed rgba(14, 116, 144, 0.18);
}

.optics-timeline__where {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.5;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

@media (max-width: 699px) {
  .optics-timeline::before {
    left: 0.15rem;
  }
}



/* ——— Invited speakers page ——— */
.speakers-page-heading {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 2.85rem);
  font-weight: 700;
  margin: 0 0 2rem;
  letter-spacing: -0.02em;
  background: linear-gradient(125deg, var(--hero-mid) 0%, var(--accent) 45%, #0f766e 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.speakers-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr));
  gap: 1.15rem 1.25rem;
}

.speakers-grid > li {
  margin: 0;
}

.speaker-card {
  position: relative;
  height: 100%;
  min-height: 0;
  padding: 1.2rem 1.25rem 1.2rem 1.15rem;
  padding-left: 1.2rem;
  border-radius: 18px;
  background: linear-gradient(
    155deg,
    rgba(255, 252, 247, 0.97) 0%,
    rgba(248, 250, 252, 0.94) 50%,
    rgba(241, 245, 249, 0.9) 100%
  );
  border: 1px solid rgba(21, 32, 43, 0.08);
  box-shadow: 0 8px 28px rgba(15, 23, 42, 0.07), 0 1px 0 rgba(255, 255, 255, 0.85) inset;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  column-gap: 1.1rem;
  row-gap: 0.5rem;
  align-items: start;
  transition: transform 0.45s var(--ease-out), box-shadow var(--transition), border-color var(--transition);
  overflow: hidden;
}

.speaker-card__accent {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--accent-bright), var(--gold-bright));
  opacity: 0.95;
  border-radius: 18px 0 0 18px;
}

.speakers-grid > li:nth-child(3n + 2) .speaker-card__accent {
  background: linear-gradient(180deg, #a78bfa, var(--accent-bright));
}

.speakers-grid > li:nth-child(3n) .speaker-card__accent {
  background: linear-gradient(180deg, #fb923c, #f472b6);
}

.speaker-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 22px 48px rgba(14, 116, 144, 0.14), 0 0 0 1px rgba(34, 211, 238, 0.18);
  border-color: rgba(34, 211, 238, 0.22);
}

.speaker-card__monogram {
  grid-row: 1 / -1;
  width: 3.35rem;
  height: 3.35rem;
  flex-shrink: 0;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #ecfeff;
  background: linear-gradient(145deg, #0e7490 0%, #155e75 40%, #0f172a 100%);
  box-shadow: 0 8px 24px rgba(14, 116, 144, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(34, 211, 238, 0.25);
  align-self: start;
  margin-top: 0.1rem;
}

.speaker-card__name {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.12rem, 2.2vw, 1.3rem);
  font-weight: 600;
  line-height: 1.28;
  letter-spacing: -0.02em;
  color: var(--hero-mid);
}

.speaker-card__surname {
  display: inline;
}

.speaker-card__given {
  display: inline;
  margin-left: 0.35rem;
  font-size: 0.92em;
  font-weight: 600;
  color: var(--gold);
  font-variant-numeric: proportional-nums;
}

.speaker-card__name-text {
  display: block;
}

.speaker-card__first {
  font-weight: 600;
  color: var(--hero-mid);
}

.speaker-card__family {
  color: #b45309;
  font-weight: 700;
}

.speaker-card__affil {
  grid-column: 2;
  grid-row: 2;
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.5;
  font-weight: 500;
  color: var(--ink-muted);
}

.speaker-card__tetra {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #0d9488;
  opacity: 0.9;
}

@media (max-width: 480px) {
  .speaker-card {
    grid-template-columns: auto 1fr;
    padding: 1.15rem 1.1rem 1.15rem 1rem;
  }

  .speaker-card__monogram {
    width: 3rem;
    height: 3rem;
    font-size: 0.75rem;
  }

  .speaker-card__name {
    font-size: 1.12rem;
  }

  .speaker-card__affil {
    font-size: 0.8rem;
  }
}

/* ——— Hero ——— */
.hero {
  position: relative;
  overflow: hidden;
  padding: 3.25rem 1.35rem 4.25rem;
  margin: 0 0 0.5rem;
  border-radius: 0 0 clamp(1.25rem, 3vw, 2.25rem) clamp(1.25rem, 3vw, 2.25rem);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    165deg,
    var(--hero-deep) 0%,
    #121c2e 38%,
    var(--hero-mid) 72%,
    #1a3050 100%
  );
  z-index: 0;
}

.hero-gridlines {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 70%);
  pointer-events: none;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
  pointer-events: none;
}

.hero-orb--a {
  width: min(420px, 55vw);
  height: min(420px, 55vw);
  background: #0891b2;
  top: -12%;
  left: -8%;
}

.hero-orb--b {
  width: min(380px, 50vw);
  height: min(380px, 50vw);
  background: #ea580c;
  bottom: -20%;
  right: -10%;
  opacity: 0.35;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 1220px;
  margin: 0 auto;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr minmax(280px, 1.2fr) 1fr;
  gap: clamp(1rem, 3vw, 2rem);
  align-items: center;
}

.hero-panel {
  border-radius: 20px;
  padding: 1.15rem 1.25rem;
  min-height: 200px;
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
    145deg,
    rgba(255, 255, 255, 0.12) 0%,
    rgba(255, 255, 255, 0.04) 100%
  );
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.12);
  transition: transform 0.5s var(--ease-out), box-shadow var(--transition);
}

.hero-panel:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: 0 32px 64px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.hero-panel--tilt-left {
  transform: rotate(-2deg);
}

.hero-panel--tilt-right {
  transform: rotate(2deg);
}

.hero-panel--tilt-left:hover {
  transform: rotate(-1deg) translateY(-4px) scale(1.02);
}

.hero-panel--tilt-right:hover {
  transform: rotate(1deg) translateY(-4px) scale(1.02);
}

.hero-panel img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.25));
}

.hero-center {
  text-align: center;
  padding: 0.75rem 0.5rem;
}

.hero-eyebrow {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(165, 243, 252, 0.85);
  margin: 0 0 1rem;
}

.hero-lockup {
  font-family: var(--font-display);
  margin: 0 0 1.15rem;
  line-height: 1.02;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
}

h1.hero-lockup {
  font-weight: inherit;
  font-size: inherit;
}

.hero-title-line {
  font-size: clamp(2.35rem, 6.5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(120deg, #f8fafc 12%, #a5f3fc 42%, #fed7aa 88%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 12px 32px rgba(0, 0, 0, 0.35));
}

.hero-title-year {
  font-family: var(--font-body);
  font-size: clamp(1.5rem, 3.5vw, 2.15rem);
  font-weight: 600;
  letter-spacing: 0.28em;
  color: rgba(241, 245, 249, 0.92);
}

.hero-taglines {
  font-size: clamp(0.72rem, 1.35vw, 0.82rem);
  font-weight: 600;
  line-height: 1.55;
  margin: 0 0 1.35rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(226, 232, 240, 0.88);
}

.hero-taglines-sub {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.92em;
  letter-spacing: 0.1em;
  color: rgba(203, 213, 225, 0.85);
  font-weight: 500;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  justify-content: center;
}

.hero-pill {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #e2e8f0;
}

.hero-pill--accent {
  background: linear-gradient(120deg, rgba(34, 211, 238, 0.25), rgba(251, 146, 60, 0.2));
  border-color: rgba(34, 211, 238, 0.35);
  color: #ecfeff;
}

/* ——— Hero: OPTICS-15 (index) ——— */
.hero-grid--optics {
  grid-template-columns: minmax(200px, 0.88fr) minmax(300px, 1.4fr) minmax(150px, 0.75fr);
  gap: clamp(0.9rem, 2.2vw, 1.75rem);
  align-items: center;
}

.hero-center--optics {
  padding: 0.5rem 0.4rem 0.6rem;
}

.hero-eyebrow--optics {
  color: rgba(204, 251, 241, 0.88);
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.hero-symposium {
  font-family: var(--font-body);
  margin: 0 0 0.6rem;
  padding: 0;
  font-size: inherit;
  font-weight: 700;
}

.hero-symposium__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  text-wrap: balance;
}

.hero-symposium__line1 {
  display: block;
  max-width: 32rem;
  font-size: clamp(1.05rem, 2.1vw, 1.4rem);
  line-height: 1.3;
  letter-spacing: 0.01em;
  text-align: center;
}

.hero-symposium__accent {
  color: #fb7185;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.45);
}

.hero-symposium__and {
  color: rgba(248, 250, 252, 0.96);
  font-weight: 600;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}

.hero-symposium__theme {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.2vw, 1.9rem);
  line-height: 1.2;
  font-weight: 700;
  color: #7dd3fc;
  letter-spacing: 0.01em;
  text-shadow: 0 3px 22px rgba(0, 0, 0, 0.4);
  margin-top: 0.1rem;
}

.hero-symposium__series {
  margin: 0 0 0.9rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-symposium__series a {
  color: rgba(165, 243, 252, 0.92);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

.hero-symposium__series a:hover {
  color: #ecfeff;
  text-decoration: none;
}

.hero-cost {
  border-radius: 20px;
  padding: 1.2rem 1.35rem;
  min-height: 0;
  aspect-ratio: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(165deg, rgba(255, 252, 247, 0.98) 0%, rgba(241, 245, 249, 0.96) 100%);
  border: 1px solid rgba(21, 32, 43, 0.08);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.7);
  transform: rotate(1.5deg);
  transition: transform 0.45s var(--ease-out), box-shadow var(--transition);
}

.hero-cost:hover {
  transform: rotate(0.5deg) translateY(-3px);
  box-shadow: 0 24px 56px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.hero-cost__link {
  display: block;
  line-height: 0;
  border-radius: 8px;
}

.hero-cost__link img {
  width: 100%;
  max-width: 200px;
  height: auto;
  object-fit: contain;
  filter: none;
  display: block;
}

/* ——— Scope ——— */
.scope-section {
  max-width: 760px;
  margin: 0 auto 2.75rem;
  position: relative;
}

.scope-section h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.5vw, 2.6rem);
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--hero-mid), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.scope-section .subhead {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0.35rem 0 1.5rem;
}

.scope-section.overview-optics {
  max-width: 960px;
  margin-bottom: 3.15rem;
}

.overview-indico__top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
  gap: 1.35rem 1.5rem;
  align-items: start;
}

.overview-indico__figure {
  margin: 0;
}

.overview-indico__figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 16px;
  object-fit: cover;
  aspect-ratio: 4 / 3;
  box-shadow: 0 16px 48px rgba(15, 23, 42, 0.14);
  border: 1px solid rgba(21, 32, 43, 0.06);
}

.overview-indico__lead {
  margin: 0 0 0.85rem;
  font-size: 1.05rem;
  line-height: 1.64;
  font-weight: 500;
  color: var(--ink);
}

.overview-indico__org-list {
  margin-top: 0.35rem;
}

.overview-indico__highlights {
  margin-top: 1.6rem;
  padding-top: 1.45rem;
  border-top: 1px solid rgba(14, 116, 144, 0.18);
}

.overview-indico__highlights .org-block__title {
  text-transform: none;
  letter-spacing: 0.04em;
  font-size: 1rem;
  font-weight: 800;
  color: var(--gold);
  margin-bottom: 0.7rem;
}

.overview-indico__goal {
  margin: 1.55rem 0 0;
  padding: 1.1rem 0 0;
  font-size: 1.02rem;
  line-height: 1.66;
  font-weight: 500;
  color: var(--ink);
  border-top: 1px solid rgba(14, 116, 144, 0.12);
}

@media (max-width: 720px) {
  .overview-indico__top {
    grid-template-columns: 1fr;
  }

  .overview-indico__figure img {
    aspect-ratio: 16 / 10;
  }
}

.scope-expand {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.65rem 1.85rem;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
  border-left: 4px solid var(--accent-bright);
}

.scope-expand:hover {
  border-color: rgba(14, 116, 144, 0.2);
  box-shadow: var(--shadow-float);
  transform: translateY(-2px);
}

.scope-expand:focus-visible {
  outline: 2px solid var(--accent-bright);
  outline-offset: 3px;
}

.scope-expand.is-open {
  cursor: default;
  transform: none;
}

.scope-expand.is-open .scope-toggle-hint {
  display: none;
}

.scope-preview p,
.scope-rest p {
  margin: 0 0 1rem;
}

.scope-preview p:last-child,
.scope-rest p:last-child {
  margin-bottom: 0;
}

.scope-rest {
  display: none;
  margin-top: 1.1rem;
  padding-top: 1.25rem;
  border-top: 1px dashed rgba(14, 116, 144, 0.2);
  animation: fadeIn 0.4s var(--ease-out);
}

.scope-expand.is-open .scope-rest {
  display: block;
}

.scope-toggle-hint {
  margin-top: 1.1rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.scope-toggle-hint::after {
  content: "↓";
  font-size: 1rem;
  transition: transform var(--transition);
}

.scope-expand:hover .scope-toggle-hint::after {
  transform: translateY(3px);
}

.scope-less {
  margin-top: 1.35rem;
  padding: 0.55rem 1.15rem;
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(14, 116, 144, 0.2);
  border-radius: 999px;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.scope-less:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-1px);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.cta-registration {
  text-align: center;
  margin: 2.25rem 0 3rem;
}

.cta-registration a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 0.8rem;
  padding: 1rem 2rem;
  background: linear-gradient(125deg, #0e7490, #0891b2, #0d9488);
  color: #fff !important;
  text-decoration: none;
  border-radius: 999px;
  box-shadow: 0 4px 20px rgba(14, 116, 144, 0.45), 0 0 0 1px rgba(255, 255, 255, 0.12) inset;
  transition: transform var(--transition), box-shadow var(--transition);
}

.cta-registration a:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 36px rgba(14, 116, 144, 0.5);
  text-decoration: none;
}

.cta-registration a::after {
  content: "→";
  font-size: 1.1em;
  transition: transform var(--transition);
}

.cta-registration a:hover::after {
  transform: translateX(4px);
}

/* ——— Organizers & topics (overview) ——— */
.organizers-topics {
  margin: 0 auto 3.1rem;
  max-width: 1100px;
  padding: 0.35rem 0.25rem 0;
}

.organizers-topics .tri-section__eyebrow {
  margin-bottom: 1.5rem;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.24em;
  opacity: 1;
}

.organizers-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  gap: clamp(1.35rem, 2.8vw, 1.9rem);
  align-items: start;
}

.content-card {
  background: linear-gradient(
    165deg,
    rgba(255, 252, 247, 0.99) 0%,
    rgba(245, 248, 252, 0.97) 100%
  );
  border: 1px solid rgba(21, 32, 43, 0.11);
  border-left: 6px solid var(--accent-bright);
  border-radius: 20px;
  padding: 1.85rem 1.8rem 2rem 1.95rem;
  box-shadow: 0 12px 44px rgba(15, 23, 42, 0.1), 0 1px 0 rgba(255, 255, 255, 0.95) inset;
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

.content-card:hover {
  box-shadow: 0 16px 52px rgba(15, 23, 42, 0.12), 0 1px 0 rgba(255, 255, 255, 0.98) inset;
  border-color: rgba(21, 32, 43, 0.13);
  transform: translateY(-2px);
}

.content-card.content-card--overview {
  margin-top: 0.2rem;
  padding: 1.95rem 1.9rem 2.1rem 2rem;
  border: 1px solid rgba(21, 32, 43, 0.12);
  border-left: 6px solid var(--accent-bright);
  box-shadow: 0 14px 48px rgba(15, 23, 42, 0.12), 0 1px 0 rgba(255, 255, 255, 0.95) inset;
}

.content-card.content-card--overview:hover {
  box-shadow: 0 18px 56px rgba(15, 23, 42, 0.13), 0 1px 0 rgba(255, 255, 255, 0.98) inset;
  transform: translateY(-2px);
}

.content-card__title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.5vw, 1.95rem);
  font-weight: 800;
  margin: 0 0 1.2rem;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--hero-mid), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.org-block + .org-block {
  margin-top: 1.5rem;
  padding-top: 1.4rem;
  border-top: 1px solid rgba(14, 116, 144, 0.16);
}

.org-block__title {
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 0.75rem;
  line-height: 1.4;
}

.org-list,
.topics-list {
  margin: 0;
  padding-left: 1.2rem;
  font-size: 1.01rem;
  line-height: 1.62;
  color: var(--ink);
  font-weight: 500;
}

.org-list {
  list-style: disc;
}

.org-list li,
.topics-list li {
  margin-bottom: 0.38rem;
  padding-left: 0.2rem;
}

.org-list li:last-child,
.topics-list li:last-child {
  margin-bottom: 0;
}

.org-role {
  color: var(--ink-muted);
  font-weight: 600;
  font-size: 0.95em;
}

.content-card--topics .topics-list {
  list-style: disc;
  column-count: 1;
  column-gap: 1.5rem;
}

.content-card--topics .topics-list li {
  break-inside: avoid;
}

@media (min-width: 520px) {
  .content-card--topics .topics-list {
    column-count: 2;
  }
}

@media (max-width: 900px) {
  .organizers-layout {
    grid-template-columns: 1fr;
  }
}

/* ——— Posters & materials (tri-cards) ——— */
.tri-section {
  margin-bottom: 0;
}

.tri-section__eyebrow {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.85rem;
  text-align: center;
  opacity: 0.9;
}

.tri-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1rem, 2.5vw, 1.75rem);
  margin-bottom: 0;
}

.tri-card {
  background: linear-gradient(
    165deg,
    rgba(255, 252, 247, 0.98) 0%,
    rgba(248, 250, 252, 0.94) 100%
  );
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid rgba(21, 32, 43, 0.09);
  box-shadow: 0 8px 32px rgba(15, 23, 42, 0.07), 0 1px 0 rgba(255, 255, 255, 0.8) inset;
  transition: transform 0.5s var(--ease-out), box-shadow var(--transition), border-color var(--transition);
  position: relative;
}

.tri-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-bright), var(--gold-bright));
  opacity: 1;
  z-index: 3;
}

.tri-card:nth-child(2)::before {
  background: linear-gradient(90deg, #a78bfa, var(--accent-bright), #38bdf8);
}

.tri-card:nth-child(3)::before {
  background: linear-gradient(90deg, #fb923c, #f472b6, #c084fc);
}

.tri-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 28px 56px rgba(15, 23, 42, 0.14), 0 0 0 1px rgba(34, 211, 238, 0.12);
  border-color: rgba(34, 211, 238, 0.22);
}

.tri-card__head {
  position: relative;
  z-index: 2;
  padding: 1rem 1.2rem 0.95rem;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.97) 0%, rgba(248, 250, 252, 0.88) 100%);
  border-bottom: 1px solid rgba(14, 116, 144, 0.12);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
}

.tri-card__head h3 {
  font-family: var(--font-display);
  font-size: 1.22rem;
  font-weight: 700;
  margin: 0;
  color: var(--hero-mid);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.tri-zoom {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  margin: 0;
  padding: 0;
  border: none;
  background: transparent;
  font: inherit;
  display: block;
  cursor: zoom-in;
  position: relative;
  text-align: inherit;
  border-radius: 0;
}

.tri-zoom:focus {
  outline: none;
}

.tri-zoom:focus-visible {
  outline: 2px solid var(--accent-bright);
  outline-offset: -3px;
  z-index: 2;
}

.tri-zoom__shine {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    125deg,
    rgba(34, 211, 238, 0.18),
    transparent 42%,
    rgba(251, 146, 60, 0.12)
  );
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
  z-index: 2;
}

.tri-zoom:hover .tri-zoom__shine,
.tri-zoom:focus-visible .tri-zoom__shine {
  opacity: 1;
}

.tri-zoom__hint {
  position: absolute;
  bottom: 0.55rem;
  right: 0.55rem;
  z-index: 3;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.38rem 0.6rem;
  border-radius: 999px;
  color: var(--hero-mid);
  background: rgba(255, 252, 247, 0.94);
  border: 1px solid rgba(14, 116, 144, 0.18);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--transition), transform var(--transition);
  pointer-events: none;
}

.tri-zoom:hover .tri-zoom__hint,
.tri-zoom:focus-visible .tri-zoom__hint {
  opacity: 1;
  transform: translateY(0);
}

@media (hover: none) and (pointer: coarse) {
  .tri-zoom__hint {
    opacity: 0.92;
    transform: translateY(0);
    font-size: 0.6rem;
    padding: 0.32rem 0.5rem;
  }
}

.tri-zoom__hint-icon {
  width: 13px;
  height: 13px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  position: relative;
  flex-shrink: 0;
  opacity: 0.9;
}

.tri-zoom__hint-icon::after {
  content: "";
  position: absolute;
  width: 6px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  right: -5px;
  bottom: -1px;
  transform: rotate(45deg);
}

.tri-card .tri-img {
  aspect-ratio: 3 / 4;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 0.75rem;
  box-sizing: border-box;
  position: relative;
}

.tri-card:nth-child(1) .tri-img {
  background: linear-gradient(180deg, #f5f3ff 0%, #ede9fe 38%, #ddd6fe 72%, #c4b5fd 100%);
}

.tri-card:nth-child(2) .tri-img {
  background: linear-gradient(180deg, #f0f9ff 0%, #e0f2fe 35%, #bae6fd 70%, #7dd3fc 100%);
}

.tri-card:nth-child(3) .tri-img {
  background: linear-gradient(180deg, #fffbeb 0%, #fef3c7 32%, #fde68a 68%, #fcd34d 100%);
}

.tri-card .tri-img::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 45% at 50% 0%, rgba(255, 255, 255, 0.65), transparent 55%);
  pointer-events: none;
  opacity: 0.9;
}

.tri-card .tri-img img {
  position: relative;
  z-index: 1;
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  object-position: center;
  display: block;
  filter: drop-shadow(0 12px 20px rgba(15, 23, 42, 0.12));
}

/* ——— Image lightbox ——— */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 4000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(0.5rem, 2.5vw, 1.25rem);
}

.lightbox[hidden] {
  display: none !important;
}

.lightbox__backdrop {
  position: absolute;
  inset: 0;
  border: none;
  padding: 0;
  margin: 0;
  background: rgba(8, 12, 20, 0.82);
  backdrop-filter: blur(8px) saturate(1.05);
  -webkit-backdrop-filter: blur(8px) saturate(1.05);
  cursor: pointer;
  transition: background 0.3s ease;
}

.lightbox__backdrop:hover {
  background: rgba(8, 12, 20, 0.88);
}

.lightbox__panel {
  position: relative;
  z-index: 1;
  width: min(900px, 96vw);
  max-height: min(94dvh, 94vh, 960px);
  display: flex;
  flex-direction: column;
  background: linear-gradient(
    165deg,
    rgba(255, 252, 247, 0.99) 0%,
    rgba(241, 245, 249, 0.97) 100%
  );
  border-radius: 22px;
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: 0 40px 80px rgba(0, 0, 0, 0.38), 0 0 0 1px rgba(34, 211, 238, 0.12) inset;
  overflow: hidden;
  animation: lightboxIn 0.38s var(--ease-out);
}

@keyframes lightboxIn {
  from {
    opacity: 0;
    transform: scale(0.94) translateY(16px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .lightbox__panel {
    animation: none;
  }
}

.lightbox__head {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1rem 0.9rem 1.35rem;
  border-bottom: 1px solid rgba(21, 32, 43, 0.08);
  background: rgba(255, 255, 255, 0.72);
}

.lightbox__title {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 3vw, 1.45rem);
  font-weight: 700;
  margin: 0;
  color: var(--hero-mid);
  letter-spacing: -0.02em;
}

.lightbox__close {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(15, 23, 42, 0.07);
  color: var(--hero-mid);
  transition: background var(--transition), color var(--transition), transform var(--transition),
    box-shadow var(--transition);
}

.lightbox__close:hover {
  background: linear-gradient(135deg, #0e7490, #0891b2);
  color: #fff;
  transform: rotate(90deg);
  box-shadow: 0 8px 24px rgba(14, 116, 144, 0.45);
}

.lightbox__close:focus-visible {
  outline: 2px solid var(--accent-bright);
  outline-offset: 2px;
}

.lightbox__close-icon {
  width: 18px;
  height: 18px;
  position: relative;
}

.lightbox__close-icon::before,
.lightbox__close-icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
}

.lightbox__close-icon::before {
  transform: translate(-50%, -50%) rotate(45deg);
}

.lightbox__close-icon::after {
  transform: translate(-50%, -50%) rotate(-45deg);
}

.lightbox__stage {
  flex: 1;
  min-height: 0;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(0.85rem, 2.5vw, 1.5rem);
  background: radial-gradient(ellipse 85% 65% at 50% 35%, rgba(226, 232, 240, 0.75), transparent 60%),
    linear-gradient(185deg, #e2e8f0 0%, #cbd5e1 48%, #94a3b8 100%);
}

.lightbox__img {
  display: block;
  max-width: 100%;
  width: auto;
  height: auto;
  max-height: min(76dvh, 76vh, 1400px);
  object-fit: contain;
  object-position: center;
  border-radius: 10px;
  box-shadow: 0 20px 56px rgba(0, 0, 0, 0.22);
}

/* ——— Sponsors ——— */
.sponsors {
  position: relative;
  max-width: 1100px;
  margin: 0 auto 2.5rem;
  padding: 3.25rem 1rem 0;
  text-align: center;
}

.sponsors.sponsors--page {
  margin-top: 2.5rem;
  margin-bottom: 2rem;
}

.sponsors::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(100%, 520px);
  height: 3px;
  border-radius: 3px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(34, 211, 238, 0.5) 22%,
    rgba(251, 146, 60, 0.65) 50%,
    rgba(167, 139, 250, 0.45) 78%,
    transparent 100%
  );
  opacity: 0.95;
}

.sponsors__eyebrow {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 0.5rem;
  opacity: 0.95;
}

.sponsors__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.5vw, 2.15rem);
  font-weight: 700;
  margin: 0 0 2rem;
  letter-spacing: -0.03em;
  background: linear-gradient(125deg, var(--hero-mid) 0%, var(--accent) 45%, #0f766e 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.sponsor-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: stretch;
  gap: 1.25rem 1.75rem;
}

/* Wide logos (e.g. YSU, Optica) need more room than 104×104 */
.sponsor-row a.sponsor--wide {
  min-width: min(200px, 100%);
  min-height: 120px;
}

.sponsor-row a.sponsor--wide img {
  width: 180px;
  max-width: 100%;
  height: 84px;
  object-fit: contain;
}

.sponsor-row a {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.35rem 1.5rem;
  min-width: 132px;
  min-height: 132px;
  border-radius: 18px;
  background: linear-gradient(
    165deg,
    rgba(255, 252, 247, 0.96) 0%,
    rgba(241, 245, 249, 0.9) 100%
  );
  border: 1px solid rgba(21, 32, 43, 0.08);
  box-shadow: 0 10px 36px rgba(15, 23, 42, 0.08), 0 1px 0 rgba(255, 255, 255, 0.9) inset;
  transition: transform 0.45s var(--ease-out), box-shadow var(--transition), border-color var(--transition);
  text-decoration: none;
}

.sponsor-row a:hover {
  transform: translateY(-8px);
  box-shadow: 0 24px 48px rgba(14, 116, 144, 0.18), 0 0 0 1px rgba(34, 211, 238, 0.25);
  border-color: rgba(34, 211, 238, 0.35);
}

.sponsor-row img {
  width: 104px;
  height: 104px;
  object-fit: contain;
  filter: drop-shadow(0 4px 12px rgba(15, 23, 42, 0.08));
  transition: transform var(--transition);
}

.sponsor-row a:hover img {
  transform: scale(1.04);
}

/* ——— Footer ——— */
.site-footer {
  position: relative;
  background: linear-gradient(180deg, #0d1320 0%, #070a10 100%);
  color: rgba(255, 255, 255, 0.82);
  padding: 2.75rem 1.35rem calc(1.65rem + env(safe-area-inset-bottom, 0px));
  margin-top: auto;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(34, 211, 238, 0.6) 25%,
    rgba(251, 146, 60, 0.7) 75%,
    transparent
  );
}

.footer-inner {
  max-width: 920px;
  margin: 0 auto;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem 1rem;
  margin-bottom: 1.85rem;
}

.footer-nav a {
  color: rgba(226, 232, 240, 0.72);
  text-decoration: none;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: color var(--transition), background var(--transition), border-color var(--transition),
    transform var(--transition);
}

.footer-nav a::after {
  display: none;
}

.footer-nav a:hover {
  color: #fff;
  background: rgba(34, 211, 238, 0.12);
  border-color: rgba(34, 211, 238, 0.25);
  transform: translateY(-3px);
}

@media (max-width: 768px) {
  .footer-nav a {
    min-height: 2.75rem;
    display: inline-flex;
    align-items: center;
    padding: 0.55rem 1rem;
  }
}

.footer-credit {
  text-align: center;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.38);
  padding-top: 1.35rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-credit strong {
  color: rgba(255, 255, 255, 0.55);
  font-weight: 600;
}

/* ——— Responsive ——— */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-grid--optics {
    grid-template-columns: 1fr;
  }

  .hero-grid--optics .hero-center--optics {
    order: 0;
  }

  .hero-grid--optics .hero-panel:first-child {
    order: 1;
  }

  .hero-grid--optics .hero-cost {
    order: 2;
    max-width: 280px;
    margin-left: auto;
    margin-right: auto;
    transform: none;
  }

  .hero-grid--optics .hero-cost:hover {
    transform: translateY(-3px);
  }

  .hero-panel--tilt-left,
  .hero-panel--tilt-right {
    transform: none;
    max-width: 320px;
    margin: 0 auto;
    aspect-ratio: 1 / 1;
  }

  .hero-panel--tilt-left:hover,
  .hero-panel--tilt-right:hover {
    transform: translateY(-4px) scale(1.02);
  }

  .hero-grid:not(.hero-grid--optics) .hero-panel:first-child {
    order: 1;
  }

  .hero-center {
    order: 0;
  }

  .hero-grid:not(.hero-grid--optics) .hero-panel:last-child {
    order: 2;
  }

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

@media (max-width: 768px) {
  body.is-nav-open {
    overflow: hidden;
  }

  .header-inner {
    position: relative;
    z-index: 2;
  }

  .brand {
    max-width: calc(100% - 3.5rem);
    font-size: clamp(0.62rem, 3.2vw, 1.05rem);
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 1;
    background: rgba(10, 15, 24, 0.98);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--ease-out);
  }

  .site-nav.is-open {
    max-height: min(28rem, calc(100dvh - var(--header-h) - env(safe-area-inset-top, 0px)));
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
  }

  @supports not (height: 100dvh) {
    .site-nav.is-open {
      max-height: min(28rem, calc(100vh - var(--header-h) - env(safe-area-inset-top, 0px)));
    }
  }

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem 1.35rem 1.25rem;
    gap: 0.2rem;
  }

  .site-nav a {
    display: flex;
    align-items: center;
    min-height: 2.75rem;
    padding: 0.5rem 0.85rem;
    border-radius: 10px;
    border-bottom: none;
    -webkit-tap-highlight-color: rgba(34, 211, 238, 0.12);
    touch-action: manipulation;
  }
}