:root {
  --bg: #071018;
  --bg-soft: #10202d;
  --panel: rgba(14, 26, 37, 0.84);
  --panel-strong: rgba(18, 32, 45, 0.95);
  --line: rgba(177, 209, 229, 0.16);
  --line-strong: rgba(201, 224, 236, 0.28);
  --text: #edf6fa;
  --muted: #b6c6cf;
  --accent: #9fdcb7;
  --accent-2: #7cb9d6;
  --accent-3: #d9c486;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
  --radius-lg: 24px;
  --radius-md: 16px;
  --page-width: min(1820px, calc(100% - clamp(1rem, 3vw, 4.5rem)));
}

html[data-theme="light"] {
  --bg: #eef2ee;
  --bg-soft: #dde7e3;
  --panel: rgba(255, 252, 247, 0.82);
  --panel-strong: rgba(255, 252, 247, 0.96);
  --line: rgba(44, 69, 78, 0.12);
  --line-strong: rgba(44, 69, 78, 0.2);
  --text: #17232b;
  --muted: #55646d;
  --accent: #3d7b57;
  --accent-2: #2f6988;
  --accent-3: #8c6d1b;
  --shadow: 0 24px 60px rgba(20, 39, 49, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(124, 185, 214, 0.1), transparent 28%),
    radial-gradient(circle at bottom left, rgba(159, 220, 183, 0.08), transparent 30%),
    linear-gradient(180deg, var(--bg) 0%, #0c1721 100%);
  font-family: "Georgia", "Cambria", serif;
}

html[data-theme="light"] body {
  background:
    radial-gradient(circle at top, rgba(124, 185, 214, 0.1), transparent 26%),
    radial-gradient(circle at bottom left, rgba(159, 220, 183, 0.08), transparent 30%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 100%);
}

a {
  color: inherit;
  text-decoration: none;
}

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

button {
  font: inherit;
}

.site-shell {
  position: relative;
  z-index: 2;
}

.page-width {
  width: var(--page-width);
  margin: 0 auto;
}

.science-background {
  position: fixed;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.atom {
  position: absolute;
  inset: auto;
}

.atom-main {
  width: min(120vmax, 1400px);
  height: min(120vmax, 1400px);
  left: 50%;
  top: 42%;
  transform: translate(-50%, -50%);
  opacity: 0.34;
}

html[data-theme="light"] .atom-main {
  opacity: 0.56;
}

.orbit {
  position: absolute;
  inset: 8%;
  border: 1.4px solid rgba(159, 220, 183, 0.18);
  border-radius: 50%;
}

html[data-theme="light"] .orbit {
  border-color: rgba(47, 105, 136, 0.28);
  box-shadow: 0 0 18px rgba(47, 105, 136, 0.08);
}

.orbit-1 {
  transform: rotate(0deg);
  animation: orbit-spin 28s linear infinite;
}

.orbit-2 {
  inset: 18%;
  transform: rotate(58deg);
  animation: orbit-spin-reverse 22s linear infinite;
}

.orbit-3 {
  inset: 28%;
  transform: rotate(116deg);
  animation: orbit-spin 18s linear infinite;
}

.orbit::after {
  content: "";
  position: absolute;
  top: 50%;
  left: -7px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  box-shadow: 0 0 20px rgba(124, 185, 214, 0.5);
}

html[data-theme="light"] .orbit::after {
  background: linear-gradient(135deg, #2f6988, #3f8f66);
  box-shadow: 0 0 22px rgba(47, 105, 136, 0.42);
}

.nucleus {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  background:
    radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.7), transparent 18%),
    radial-gradient(circle at center, rgba(159, 220, 183, 0.55), rgba(124, 185, 214, 0.16) 60%, transparent 72%);
  filter: blur(1px);
}

html[data-theme="light"] .nucleus {
  background:
    radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.8), transparent 18%),
    radial-gradient(circle at center, rgba(63, 143, 102, 0.38), rgba(47, 105, 136, 0.22) 60%, transparent 72%);
}

.mesh {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
}

.mesh-a {
  width: 30rem;
  height: 30rem;
  top: -8rem;
  right: -6rem;
  background: rgba(124, 185, 214, 0.09);
}

.mesh-b {
  width: 28rem;
  height: 28rem;
  left: -6rem;
  bottom: 4rem;
  background: rgba(159, 220, 183, 0.08);
}

.site-header {
  width: var(--page-width);
  margin: 1rem auto 0;
  min-height: 7rem;
  padding: 1.08rem 1.55rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.35rem;
  position: sticky;
  top: 1rem;
  z-index: 5;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(7, 16, 24, 0.72);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
}

html[data-theme="light"] .site-header {
  background: rgba(255, 252, 247, 0.8);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.95rem;
  min-width: 0;
  position: relative;
}

.brand-logo {
  display: block;
  object-fit: contain;
  filter: drop-shadow(0 6px 18px rgba(0, 0, 0, 0.18));
  position: relative;
  z-index: 1;
}

html[data-theme="dark"] .brand-logo {
  filter:
    drop-shadow(0 0 8px rgba(255, 255, 255, 0.16))
    drop-shadow(0 10px 22px rgba(124, 185, 214, 0.2));
}

.brand-logo-event {
  width: 92px;
  height: 92px;
  border-radius: 22px;
}

html[data-theme="dark"] .brand-logo-event,
html[data-theme="dark"] .brand-logo-mark {
  padding: 0.28rem;
  border-radius: 24px;
  background:
    radial-gradient(circle at 50% 45%, rgba(255, 255, 255, 0.16), transparent 68%),
    rgba(255, 255, 255, 0.035);
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.08),
    0 0 22px rgba(124, 185, 214, 0.13);
}

.brand-divider {
  width: 1px;
  height: 84px;
  flex: 0 0 1px;
  background: linear-gradient(180deg, transparent, var(--line-strong), transparent);
}

.brand-logo-mark {
  width: 92px;
  height: 92px;
}

.brand-logo-wordmark-wrap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  filter: none;
}

html[data-theme="dark"] .brand-logo-wordmark-wrap {
  padding: 0.18rem 0.34rem;
  border-radius: 16px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.88), rgba(236, 244, 242, 0.76));
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.28),
    0 0 18px rgba(124, 185, 214, 0.14);
}

.brand-logo-wordmark {
  width: 198px;
  height: 82px;
  filter: none;
}

html[data-theme="light"] .brand-logo-wordmark-wrap {
  background: transparent;
}

h1,
h2,
h3 {
  letter-spacing: 0;
}

.metric-card strong,
.fee-card strong,
.overview-card strong {
  font-family: "Georgia", "Cambria", serif;
}

.site-nav {
  display: flex;
  flex-wrap: nowrap;
  justify-content: center;
  gap: 0.72rem;
}

.site-nav a {
  color: var(--muted);
  font-size: 1.24rem;
  padding: 0.82rem 1.12rem;
  border: 1px solid transparent;
  border-radius: 999px;
  transition:
    color 180ms ease,
    border-color 180ms ease,
    background 180ms ease,
    transform 180ms ease;
}

.site-nav a.is-active {
  color: var(--text);
}

.site-nav a[aria-current="page"] {
  color: var(--accent);
  border-color: var(--accent);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
  background: transparent;
  transform: translateY(-1px);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.3rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition:
    border-color 180ms ease,
    color 180ms ease,
    transform 180ms ease;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.menu-toggle {
  display: none;
  width: 2.55rem;
  height: 2.15rem;
  padding: 0.45rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  height: 2px;
  margin: 0.25rem 0;
  border-radius: 999px;
  background: var(--text);
}

.theme-toggle-track {
  width: 3.82rem;
  height: 2.28rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  position: relative;
}

.theme-toggle-thumb {
  width: 1.48rem;
  height: 1.48rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-3), var(--accent));
  transform: translateX(1.5rem);
  transition: transform 180ms ease;
  position: absolute;
  left: 0.32rem;
  top: 0.4rem;
  z-index: 2;
}

html[data-theme="light"] .theme-toggle-thumb {
  transform: translateX(0);
}

.theme-toggle-icon {
  position: absolute;
  top: 50%;
  width: 0.9rem;
  text-align: center;
  font-size: 0.92rem;
  line-height: 1;
  color: rgba(255, 255, 255, 0.78);
  transform: translateY(-50%);
  z-index: 1;
}

.theme-toggle-icon-moon {
  left: 0.42rem;
}

.theme-toggle-icon-sun {
  right: 0.42rem;
  color: #071018;
}

.announcement-bar {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 0.8rem;
  margin-top: 1rem;
  position: sticky;
  top: 8.45rem;
  z-index: 4;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.announcement-label,
.announcement-marquee {
  font-family: "Helvetica Neue", "Segoe UI", sans-serif;
}

.announcement-label {
  align-self: stretch;
  display: inline-flex;
  align-items: center;
  padding: 0.8rem 1.1rem;
  color: #fff7f5;
  background: linear-gradient(135deg, #8f1f1f, #d63d32);
  box-shadow:
    0 0 18px rgba(214, 61, 50, 0.42),
    inset 0 0 0 1px rgba(255, 255, 255, 0.18);
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.25);
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  animation: announcementTextPulse 1s ease-in-out infinite;
}

.announcement-marquee {
  min-width: 0;
  overflow: hidden;
  color: var(--text);
  font-size: 0.96rem;
  font-weight: 760;
  white-space: nowrap;
  opacity: 1;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.25);
}

.announcement-track {
  display: inline-flex;
  gap: clamp(7rem, 14vw, 13rem);
  min-width: max-content;
  padding: 0.8rem 0;
  animation: announcementScroll 24s linear infinite;
}

.announcement-set {
  display: inline-flex;
  gap: clamp(8rem, 16vw, 15rem);
}

.announcement-item {
  display: inline-block;
}

.announcement-marquee:hover .announcement-track,
.announcement-marquee:focus-visible .announcement-track {
  animation-play-state: paused;
}

@keyframes announcementTextPulse {
  0%,
  100% {
    color: #fff7f5;
    text-shadow: 0 0 8px rgba(255, 255, 255, 0.18);
  }

  50% {
    color: #ffffff;
    text-shadow:
      0 0 10px rgba(255, 255, 255, 0.72),
      0 0 20px rgba(255, 230, 226, 0.5);
  }
}

@keyframes announcementScroll {
  from {
    transform: translateX(0);
  }

  to {
    transform: translateX(-50%);
  }
}

.hero,
.page-main {
  padding-top: 0.25rem;
}

.hero {
  min-height: auto;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(310px, 0.8fr);
  gap: 2rem;
  align-items: start;
  margin-top: 1.1rem;
}

.eyebrow {
  margin: 0 0 0.85rem;
  color: var(--accent);
  font-family: "Helvetica Neue", "Segoe UI", sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: 0.76rem;
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: clamp(2.15rem, 3.15vw, 3.25rem);
  line-height: 1.03;
}

h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 3rem);
  line-height: 1.05;
}

h3 {
  margin: 0;
  font-size: 1.25rem;
}

.lead,
.surface-card p,
.metric-card span,
.section-heading p:last-child,
.site-footer p,
.speaker-item span,
.student-card span,
.volunteer-card span,
.overview-card p,
.fee-card p {
  color: var(--muted);
}

.lead,
.surface-card p,
.speaker-item span,
.student-card p,
.volunteer-card p,
.fee-card p,
.overview-card p {
  line-height: 1.75;
}

.lead {
  margin: 1.3rem 0 0;
  max-width: 62ch;
  font-size: 1.08rem;
}

.announcements-page {
  padding-top: 3rem;
}

.poster-placeholder {
  min-height: 18rem;
  display: grid;
  align-content: center;
  gap: 0.8rem;
  text-align: center;
  background:
    radial-gradient(circle at 50% 0%, rgba(159, 220, 183, 0.14), transparent 62%),
    var(--panel);
}

.poster-placeholder p {
  max-width: 34rem;
  margin-inline: auto;
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  align-items: start;
}

.contact-layout .form-card {
  min-height: min(72vh, 46rem);
}

.contact-layout .site-form {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.contact-layout .site-form label:has(textarea),
.contact-layout .site-form button,
.contact-layout .form-status {
  grid-column: 1 / -1;
}

.form-section {
  padding-top: 0;
}

.form-card {
  display: grid;
  gap: 1rem;
}

.site-form {
  display: grid;
  gap: 0.9rem;
}

.site-form label {
  display: grid;
  gap: 0.42rem;
  color: var(--text);
  font-family: "Helvetica Neue", "Segoe UI", sans-serif;
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0.03em;
}

.site-form input,
.site-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 0.82rem 0.95rem;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font: inherit;
  outline: none;
  transition:
    border-color 180ms ease,
    box-shadow 180ms ease,
    background 180ms ease;
}

html[data-theme="light"] .site-form input,
html[data-theme="light"] .site-form textarea {
  background: rgba(255, 255, 255, 0.72);
}

.site-form input:focus,
.site-form textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(159, 220, 183, 0.16);
}

.site-form textarea {
  resize: vertical;
}

.form-status {
  min-height: 1.4rem;
  margin: 0;
  color: var(--accent);
  font-weight: 800;
}

.map-card {
  width: min(100%, 760px);
  justify-self: center;
  display: grid;
  gap: 1rem;
  text-align: center;
}

.map-frame {
  width: 100%;
  min-height: 14rem;
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.admin-console {
  position: fixed;
  inset: 0;
  z-index: 20;
  overflow: auto;
  padding: clamp(1rem, 3vw, 2.5rem);
  background:
    radial-gradient(circle at 20% 15%, rgba(159, 220, 183, 0.16), transparent 28rem),
    radial-gradient(circle at 80% 20%, rgba(124, 185, 214, 0.12), transparent 30rem),
    linear-gradient(135deg, rgba(4, 12, 10, 0.98), rgba(8, 20, 26, 0.98));
  color: #eafff1;
}

body.admin-mode {
  overflow: hidden;
}

.admin-console[hidden] {
  display: none;
}

.admin-console-shell {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 1rem;
  margin: 0 auto 1rem;
  width: min(1500px, 100%);
  padding: 1.2rem;
  border: 1px solid rgba(159, 220, 183, 0.28);
  border-radius: 28px;
  background: rgba(7, 20, 18, 0.74);
  box-shadow:
    0 0 40px rgba(159, 220, 183, 0.16),
    inset 0 0 28px rgba(159, 220, 183, 0.06);
  backdrop-filter: blur(18px);
}

.admin-heading {
  margin-bottom: 0;
}

.admin-heading h2 {
  color: #f4fff8;
}

.admin-exit {
  flex: 0 0 auto;
}

.admin-grid {
  position: relative;
  z-index: 2;
  width: min(1500px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.admin-grid .surface-card {
  border-color: rgba(159, 220, 183, 0.22);
  background: rgba(8, 24, 20, 0.76);
  box-shadow:
    0 0 32px rgba(159, 220, 183, 0.09),
    inset 0 0 0 1px rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(16px);
}

.admin-list {
  display: grid;
  gap: 0.75rem;
  margin-top: 1rem;
}

.admin-item {
  display: grid;
  gap: 0.35rem;
  padding: 0.85rem;
  border: 1px solid rgba(159, 220, 183, 0.2);
  border-radius: 16px;
  background: rgba(0, 0, 0, 0.18);
}

.admin-item strong,
.admin-item small {
  display: block;
}

.admin-item small {
  color: var(--muted);
}

.admin-item button {
  justify-self: start;
  margin-top: 0.25rem;
}

.compact-form {
  margin-top: 1rem;
}

.matrix-rain {
  position: fixed;
  inset: 0;
  z-index: 1;
  overflow: hidden;
  pointer-events: none;
  opacity: 0.42;
  mask-image: linear-gradient(180deg, transparent, #000 12%, #000 90%, transparent);
}

.matrix-rain span {
  position: absolute;
  top: -45vh;
  left: var(--x);
  color: #9fdcb7;
  font-family: "Courier New", monospace;
  font-size: 0.9rem;
  line-height: 1.35;
  text-shadow: 0 0 12px rgba(159, 220, 183, 0.75);
  animation: matrixFall var(--duration) linear infinite;
  animation-delay: var(--delay);
}

@keyframes matrixFall {
  to {
    transform: translateY(155vh);
  }
}

.announcement-card {
  max-width: 760px;
  padding: 1.5rem;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease,
    box-shadow 180ms ease;
}

.announcement-card:hover,
.announcement-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--accent);
  background: transparent;
}

.announcement-card time {
  display: inline-block;
  margin-bottom: 0.75rem;
  color: var(--accent);
  font-family: "Helvetica Neue", "Segoe UI", sans-serif;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.announcement-card h2 {
  margin-bottom: 0.75rem;
}

.announcement-action {
  display: inline-flex;
  margin-top: 0.8rem;
  padding: 0.58rem 0.9rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--text);
  font-family: "Helvetica Neue", "Segoe UI", sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  transition:
    color 180ms ease,
    border-color 180ms ease,
    background 180ms ease,
    transform 180ms ease;
}

.announcement-action:hover,
.announcement-action:focus-visible,
.announcement-card:hover .announcement-action {
  color: var(--accent);
  border-color: var(--accent);
  background: transparent;
  transform: translateY(-1px);
}

.hero-metadata,
.intro-grid,
.metrics-grid,
.topic-preview-grid,
.topic-full-grid,
.session-grid,
.speaker-groups,
.student-grid,
.fees-grid,
.split-layout,
.organizer-overview,
.chip-cloud,
.dense-grid,
.volunteer-list,
.sponsor-strip,
.registration-layout {
  display: grid;
  gap: 1rem;
}

.hero-metadata {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 1.8rem 0;
}

.hero-metadata article,
.surface-card,
.metric-card,
.topic-card,
.session-card,
.speaker-cluster,
.student-card,
.fee-card,
.overview-card,
.speaker-item,
.volunteer-card,
.chip {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.hero-metadata article,
.surface-card,
.metric-card,
.topic-card,
.session-card,
.speaker-cluster,
.student-card,
.fee-card,
.overview-card {
  border-radius: var(--radius-lg);
}

.hero-metadata article {
  padding: 1rem;
}

.hero-metadata span {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--muted);
  font-family: "Helvetica Neue", "Segoe UI", sans-serif;
  font-size: 0.85rem;
}

.hero-actions,
.section-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.95rem 1.35rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: "Helvetica Neue", "Segoe UI", sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease,
    color 180ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  color: #081017;
}

.button-secondary {
  border-color: var(--line-strong);
  background: transparent;
  color: var(--text);
}

.button:hover,
.button:focus-visible {
  border-color: var(--accent);
  background: transparent;
  color: var(--accent);
}

.hero-aside {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.hero-logo-panel {
  min-height: 31rem;
  width: min(100%, 38rem);
  display: grid;
  place-items: center;
  justify-self: end;
  position: relative;
  padding: 1rem;
  border-radius: 48% 52% 50% 50% / 44% 48% 52% 56%;
  border: 1px solid rgba(124, 185, 214, 0.1);
  background:
    radial-gradient(circle at center, rgba(159, 220, 183, 0.13), transparent 58%),
    radial-gradient(circle at 64% 36%, rgba(124, 185, 214, 0.1), transparent 46%);
  overflow: hidden;
}

html[data-theme="light"] .hero-logo-panel {
  border-color: rgba(47, 105, 136, 0.13);
  background:
    radial-gradient(circle at center, rgba(63, 143, 102, 0.12), transparent 58%),
    radial-gradient(circle at 65% 35%, rgba(47, 105, 136, 0.1), transparent 48%),
    radial-gradient(circle at 45% 72%, rgba(255, 255, 255, 0.78), transparent 42%);
  box-shadow:
    0 24px 80px rgba(47, 105, 136, 0.08),
    inset 0 0 60px rgba(255, 255, 255, 0.42);
}

.hero-logo-panel::after {
  content: "";
  position: absolute;
  inset: 1.15rem;
  border-radius: 50%;
  border: 1px solid rgba(124, 185, 214, 0.1);
  pointer-events: none;
}

html[data-theme="light"] .hero-logo-panel::after {
  border-color: rgba(47, 105, 136, 0.16);
  box-shadow: inset 0 0 52px rgba(63, 143, 102, 0.08);
}

.hero-main-logo {
  width: min(100%, 500px);
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 18px 44px rgba(0, 0, 0, 0.3));
  position: relative;
  z-index: 2;
}

.hero-logo-orbit {
  position: absolute;
  border: 1px solid rgba(159, 220, 183, 0.16);
  border-radius: 50%;
}

.hero-logo-orbit-a {
  inset: 4% 10%;
}

.hero-logo-orbit-b {
  inset: 13% 0%;
}

.session-note {
  border-radius: 28px;
  border: 1px solid var(--line);
  background: var(--panel-strong);
  box-shadow: var(--shadow);
}

.session-note {
  padding: 1.4rem;
}

.crest-card {
  display: grid;
  gap: 1.25rem;
}

.crest-card img {
  max-height: 120px;
  width: auto;
  margin: 0 auto;
  object-fit: contain;
}

.session-note p {
  margin: 0 0 0.8rem;
  font-family: "Helvetica Neue", "Segoe UI", sans-serif;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.session-note ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
  line-height: 1.8;
}

.page-section {
  padding: 2.2rem 0;
}

.intro-grid,
.split-layout,
.registration-layout {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.surface-card {
  padding: 1.5rem;
}

.image-card {
  padding: 0;
  overflow: hidden;
}

.image-card img {
  width: 100%;
  height: 100%;
  min-height: 23rem;
  object-fit: cover;
}

.metrics-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  padding: 1.2rem 0 0;
}

.metric-card {
  padding: 1.3rem;
}

.metric-card strong {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 2.7rem;
  color: var(--accent-3);
}

.topic-preview-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.topic-full-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.topic-card {
  position: relative;
  overflow: hidden;
  padding: 1.25rem;
}

.topic-card::after {
  content: attr(data-mark);
  position: absolute;
  right: 1rem;
  bottom: 0.7rem;
  font-size: 2.5rem;
  color: rgba(159, 220, 183, 0.04);
}

.section-heading {
  display: grid;
  gap: 0.45rem;
  margin-bottom: 1rem;
}

.session-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.session-card {
  padding: 1.4rem;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease,
    box-shadow 180ms ease;
}

.session-card:hover,
.session-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--accent);
  background: transparent;
}

.session-card:hover h3,
.session-card:focus-within h3 {
  color: var(--accent);
}

.session-card:hover .session-tag,
.session-card:focus-within .session-tag {
  background: transparent;
  box-shadow: inset 0 0 0 1px var(--accent);
}

.session-card .session-tag {
  display: inline-block;
  margin-bottom: 0.75rem;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: rgba(159, 220, 183, 0.12);
  color: var(--accent);
  font-family: "Helvetica Neue", "Segoe UI", sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-intro {
  padding: 1rem 0 0.5rem;
}

.speaker-groups {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.speaker-cluster,
.student-card,
.fee-card,
.overview-card {
  padding: 1.3rem;
}

.speaker-list {
  display: grid;
  gap: 0.7rem;
  margin-top: 1rem;
}

.speaker-item,
.volunteer-card,
.chip {
  border-radius: 15px;
}

.speaker-item,
.volunteer-card {
  padding: 0.9rem 1rem;
}

.speaker-item strong,
.student-card strong,
.fee-card strong,
.overview-card strong,
.volunteer-card strong {
  display: block;
  margin-bottom: 0.25rem;
}

.student-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.fees-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.fee-card span {
  display: block;
  margin-top: 0.3rem;
  color: var(--accent-3);
  font-size: 1.8rem;
}

.organizer-overview {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.chip-cloud {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.chip {
  padding: 0.8rem 0.9rem;
  text-align: center;
}

.dense-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.dense-grid span {
  padding: 0.8rem 0.9rem;
  border-radius: 15px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.volunteer-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.sponsors-section {
  padding: 2rem 0 4rem;
}

.institutional-section {
  padding-top: 0;
}

.institution-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.institution-card {
  display: grid;
  gap: 1rem;
}

.institution-card h3 {
  margin: 0;
}

.institution-logo-wrap {
  display: grid;
  place-items: center;
  min-height: 7.5rem;
  padding: 1rem;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.institution-logo-wrap-light {
  background: rgba(245, 248, 247, 0.94);
}

.institution-logo {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: contain;
}

.institution-logo-cafm {
  width: min(100%, 20rem);
}

.institution-logo-iiser {
  width: 8rem;
  border-radius: 2px;
}

.sponsor-strip {
  grid-template-columns: repeat(7, minmax(0, 1fr));
  align-items: center;
}

.logo-badge {
  padding: 1rem;
  border-radius: 22px;
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0)),
    radial-gradient(circle at top, rgba(159, 220, 183, 0.08), transparent 70%);
  box-shadow: var(--shadow);
}

.logo-badge img {
  width: 100%;
  height: 78px;
  object-fit: contain;
  padding: 1rem;
  filter: none;
  opacity: 1;
}

.site-footer {
  padding: 1.4rem 0 2.4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  border-top: 1px solid var(--line);
}

.footer-links {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.72rem;
}

.footer-links a {
  padding: 0.62rem 0.95rem;
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--accent);
  font-family: "Helvetica Neue", "Segoe UI", sans-serif;
  font-size: 1rem;
  font-weight: 800;
  background: rgba(159, 220, 183, 0.08);
  transition:
    color 180ms ease,
    border-color 180ms ease,
    background 180ms ease,
    transform 180ms ease;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
  background: transparent;
  transform: translateY(-1px);
}

.footer-link {
  color: var(--accent);
  border-bottom: 1px solid transparent;
  transition: color 180ms ease, border-color 180ms ease;
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--accent-2);
  border-color: currentColor;
}

.reaction-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 8;
}

.reaction-bit {
  position: absolute;
  padding: 0.26rem 0.44rem;
  border-radius: 999px;
  font-family: "Helvetica Neue", "Segoe UI", sans-serif;
  font-size: 0.76rem;
  font-weight: 700;
  color: #071018;
  animation: reaction-rise 1100ms ease-out forwards;
}

.reaction-bit.chem {
  background: linear-gradient(135deg, #d9c486, #9fdcb7);
}

.reaction-bit.physics {
  background: linear-gradient(135deg, #7cb9d6, #d1ebff);
}

.reaction-bit.bio {
  background: linear-gradient(135deg, #9fdcb7, #dff6ea);
}

@keyframes orbit-spin {
  from {
    rotate: 0deg;
  }

  to {
    rotate: 360deg;
  }
}

@keyframes orbit-spin-reverse {
  from {
    rotate: 360deg;
  }

  to {
    rotate: 0deg;
  }
}

@keyframes reaction-rise {
  from {
    opacity: 1;
    transform: translate(0, 0) scale(1);
  }

  to {
    opacity: 0;
    transform: translate(var(--dx), var(--dy)) scale(0.72);
  }
}

@media (max-width: 1080px) {
  .hero,
  .intro-grid,
  .split-layout,
  .registration-layout,
  .speaker-groups,
  .student-grid,
  .topic-preview-grid,
  .topic-full-grid,
  .organizer-overview,
  .session-grid,
  .sponsor-strip,
  .institution-grid,
  .admin-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero {
    min-height: auto;
  }
}

@media (max-width: 780px) {
  .site-footer {
    border-radius: 28px;
    align-items: flex-start;
    flex-direction: column;
  }

  .site-header {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto auto;
    align-items: center;
    border-radius: 28px;
    min-height: 6rem;
    padding: 0.85rem 1rem;
  }

  .brand {
    max-width: 100%;
    overflow: hidden;
  }

  .hero,
  .hero-metadata,
  .intro-grid,
  .metrics-grid,
  .topic-preview-grid,
  .topic-full-grid,
  .session-grid,
  .speaker-groups,
  .student-grid,
  .fees-grid,
  .split-layout,
  .organizer-overview,
  .institution-grid,
  .contact-layout,
  .admin-grid,
  .chip-cloud,
  .dense-grid,
  .volunteer-list,
  .sponsor-strip,
  .registration-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    margin-top: 0.8rem;
  }

  .contact-layout .site-form {
    grid-template-columns: 1fr;
  }

  .theme-toggle {
    align-self: center;
  }

  .menu-toggle {
    display: inline-block;
  }

  .site-nav {
    display: none;
    grid-column: 1 / -1;
    width: 100%;
    padding-top: 0.75rem;
    flex-direction: column;
    align-items: stretch;
    gap: 0.35rem;
  }

  .site-header.nav-open .site-nav {
    display: flex;
  }

  .site-header.nav-open + .announcement-bar {
    position: relative;
    top: auto;
  }

  .site-nav a {
    width: 100%;
    padding: 0.85rem 1rem;
    font-size: 1.05rem;
  }

  .brand-logo-mark {
    width: 60px;
    height: 60px;
  }

  .brand-logo-event {
    width: 60px;
    height: 60px;
  }

  .brand-divider {
    height: 46px;
  }

  .brand-logo-wordmark-wrap {
    padding: 0;
  }

  html[data-theme="dark"] .brand-logo-wordmark-wrap {
    padding: 0.14rem 0.28rem;
  }

  .brand-logo-wordmark {
    width: 136px;
    height: 52px;
  }

  .announcement-bar {
    grid-template-columns: 1fr;
    top: 7.8rem;
    border-radius: 24px;
  }

  .announcement-label {
    justify-content: center;
  }

  .announcement-marquee {
    padding-inline: 1rem;
  }

  h1 {
    font-size: clamp(2.15rem, 10vw, 3.35rem);
  }

  .atom-main {
    width: 155vmax;
    height: 155vmax;
  }

  .hero-logo-panel {
    min-height: 18rem;
    width: min(100%, 24rem);
    justify-self: center;
  }

  .hero-main-logo {
    width: min(100%, 340px);
  }
}