/* ============================================================
   ICCB 2027 — International Conference on Cancer Biology
   Premium Design System
   ============================================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600&family=Montserrat:wght@400;500;600;700;800;900&family=Poppins:wght@300;400;500;600;700;800&display=swap');

/* ============================================================
   CSS CUSTOM PROPERTIES — Design Tokens
   ============================================================ */
:root {
  /* Core Palette */
  --midnight: #250915;
  --midnight-light: #3a1226;
  --burgundy: #5C0F1D;
  --burgundy-light: #7a1828;
  --cellular-red: #992221;
  --cellular-light: #b5302f;
  --genomics-blue: #0E2361;
  --genomics-light: #1a3485;
  --molecular-blue: #27539C;
  --molecular-light: #3468bd;
  --dna-gold: #D6B24C;
  --dna-gold-light: #e8c96a;
  --dna-gold-dark: #b8923a;
  --ivory: #F8F7F5;
  --ivory-dark: #EDE9E3;
  --text-dark: #222222;
  --text-mid: #444444;
  --text-light: #777777;
  --text-white: #ffffff;
  --text-muted: rgba(255, 255, 255, 0.65);

  /* Gradients */
  --grad-hero: linear-gradient(135deg, #250915 0%, #0E2361 40%, #5C0F1D 100%);
  --grad-dark: linear-gradient(180deg, #250915 0%, #1a0b20 100%);
  --grad-card: linear-gradient(135deg, rgba(37, 9, 21, 0.9) 0%, rgba(14, 35, 97, 0.85) 100%);
  --grad-gold: linear-gradient(135deg, #D6B24C 0%, #b8923a 100%);
  --grad-red: linear-gradient(135deg, #5C0F1D 0%, #992221 100%);
  --grad-blue: linear-gradient(135deg, #0E2361 0%, #27539C 100%);
  --grad-section: linear-gradient(180deg, #0d0618 0%, #250915 50%, #0E2361 100%);

  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.12);
  --glass-bg-dark: rgba(37, 9, 21, 0.6);
  --glass-bg-blue: rgba(14, 35, 97, 0.4);

  /* Shadows */
  --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.5);
  --shadow-gold: 0 8px 32px rgba(214, 178, 76, 0.25);
  --shadow-red: 0 8px 32px rgba(153, 34, 33, 0.35);
  --shadow-blue: 0 8px 32px rgba(14, 35, 97, 0.45);
  --glow-gold: 0 0 30px rgba(214, 178, 76, 0.4), 0 0 60px rgba(214, 178, 76, 0.2);
  --glow-red: 0 0 30px rgba(153, 34, 33, 0.5), 0 0 60px rgba(92, 15, 29, 0.3);
  --glow-blue: 0 0 30px rgba(39, 83, 156, 0.5), 0 0 60px rgba(14, 35, 97, 0.3);

  /* Typography */
  --font-heading: 'Space Grotesk', 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-numbers: 'Montserrat', sans-serif;

  /* Spacing */
  --section-pad: 50px;
  --section-pad-sm: 60px;
  --container-max: 1320px;
  --border-radius: 16px;
  --border-radius-sm: 8px;
  --border-radius-lg: 24px;

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-med: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  color: var(--text-white);
  background: var(--midnight);
  overflow-x: hidden;
  line-height: 1.7;
}

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

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

ul {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--midnight);
}

::-webkit-scrollbar-thumb {
  background: var(--dna-gold);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--dna-gold-light);
}

/* ============================================================
   SCROLL PROGRESS BAR
   ============================================================ */
#scroll-progress {
  position: fixed;
  top: 85px;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--dna-gold), var(--cellular-red), var(--molecular-blue));
  z-index: 10000;
  width: 0%;
  transition: width 0.1s linear;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all var(--transition-med);
}

#navbar.scrolled {
  background: rgba(20, 5, 15, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(214, 178, 76, 0.2);
  padding: 10px 0;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

.nav-logo img {
  height: 65px;
  width: auto;
  object-fit: contain;
  /* filter: drop-shadow(0 0 24px rgba(214,178,76,0.4)); */
  transition: transform var(--transition-fast);
}

.nav-logo img:hover {
  transform: scale(1.05);
}

.nav-logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.nav-logo-text .conf-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 2rem;
  color: var(--dna-gold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-logo-text .conf-year {
  font-family: var(--font-numbers);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-white);
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-links a {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.8);
  padding: 8px 14px;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--dna-gold);
  background: rgba(214, 178, 76, 0.1);
}

.nav-cta {
  background: linear-gradient(135deg, var(--dna-gold), var(--dna-gold-dark)) !important;
  color: var(--midnight) !important;
  font-weight: 700 !important;
  padding: 10px 22px !important;
  border-radius: 50px !important;
  box-shadow: var(--shadow-gold);
  transition: all var(--transition-fast) !important;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--glow-gold) !important;
  background: rgba(214, 178, 76, 0.1) !important;
  color: var(--dna-gold) !important;
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border-radius: var(--border-radius-sm);
  transition: background var(--transition-fast);
}

.nav-hamburger:hover {
  background: var(--glass-bg);
}

.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-white);
  border-radius: 2px;
  transition: all var(--transition-med);
}

.nav-hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-hamburger.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav-hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Nav */
.nav-mobile {
  display: none;
  position: fixed;
  top: 75;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(20, 5, 15, 0.97);
  backdrop-filter: blur(20px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
}

.nav-mobile.open {
  display: flex;
}

.nav-mobile a {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.85);
  padding: 10px 40px;
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  text-align: center;
  width: 100%;
  max-width: 300px;
  border: 1px solid transparent;
}

.nav-mobile a:hover {
  color: var(--dna-gold);
  border-color: rgba(214, 178, 76, 0.3);
  background: rgba(214, 178, 76, 0.08);
}

.nav-mobile .mob-cta {
  background: var(--grad-gold);
  color: var(--midnight) !important;
  margin-top: 12px;
}

/* ============================================================
   HERO SECTION
   ============================================================ */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--grad-hero);
}

#hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.7;
  background-image: url(./assets/hero_bg1.png);
  background-size: cover;
  background-position: center;
}

.hero-bg-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 50%, transparent 20%, rgba(37, 9, 21, 0.5) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 10;
  text-align: center;
  max-width: 1000px;
  padding: 120px 24px 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(214, 178, 76, 0.15);
  border: 1px solid rgba(214, 178, 76, 0.4);
  border-radius: 50px;
  padding: 8px 20px;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dna-gold);
  margin-bottom: 28px;
  animation: fadeInDown 0.8s ease both;
  animation-delay: 0.1s;
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  background: var(--dna-gold);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

.hero-logo {
  margin-bottom: 32px;
  animation: fadeInDown 0.8s ease both;
  animation-delay: 0.2s;
}

.hero-logo img {
  height: 100px;
  width: auto;
  filter: drop-shadow(0 0 25px rgba(214, 178, 76, 0.25));
  /* animation: logoFloat 4s ease-in-out infinite; */
}

.hero-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(2rem, 4.5vw, 4rem);
  line-height: 1.15;
  letter-spacing: -.02em;
  color: var(--text-white);
}

.line1 {
  display: block;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp .8s ease forwards;
}

/* ---------------------------- */

.typing-wrapper {
  display: inline-block;
}

.typing-text {
  display: inline-block;
  overflow: hidden;
  white-space: nowrap;

  background: linear-gradient(135deg,
      var(--dna-gold),
      var(--dna-gold-light));

  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;

  width: 0;
  border-right: 3px solid var(--dna-gold);

  animation:
    typingLoop 8s steps(14, end) infinite,
    blinkCursor .8s step-end infinite;
}

/* Typing → Pause → Delete → Pause */

@keyframes typingLoop {
  0% {
    width: 0;
  }

  30% {
    width: 13ch;
  }

  60% {
    width: 13ch;
  }

  90% {
    width: 0;
  }

  100% {
    width: 0;
  }
}

/* Cursor */

@keyframes blinkCursor {
  50% {
    border-color: transparent;
  }
}

/* ------------------------------------ */
/* Fade up */

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Typing */

@keyframes typing {
  from {
    width: 0;
  }

  to {
    width: 15ch;
  }
}

/* Cursor */

@keyframes cursor {
  50% {
    border-color: transparent;
  }
}

.hero-subtitle {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: clamp(1rem, 2vw, 1.35rem);
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 40px;
  max-width: 680px;
  line-height: 1.6;
  animation: fadeInUp 0.8s ease both;
  animation-delay: 0.4s;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 24px;
  margin-bottom: 52px;
  animation: fadeInUp 0.8s ease both;
  animation-delay: 0.5s;
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  padding: 10px 20px;
  backdrop-filter: blur(10px);
}

.hero-meta-item .icon {
  font-size: 1.1rem;
  flex-shrink: 0;
}

.hero-meta-item .text {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
}

.hero-meta-item .text strong {
  color: var(--dna-gold);
  font-weight: 700;
}

.hero-hosted {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.55);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
  animation: fadeInUp 0.8s ease both;
  animation-delay: 0.55s;
}

.hero-host-name {
  font-family: var(--font-heading);
  font-size: clamp(0.9rem, 1.5vw, 1.1rem);
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 48px;
  line-height: 1.5;
  animation: fadeInUp 0.8s ease both;
  animation-delay: 0.6s;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  animation: fadeInUp 0.8s ease both;
  animation-delay: 0.7s;
}

.hero-scroll-hint {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  animation: fadeInUp 1s ease both, scrollBounce 2s 1.5s ease-in-out infinite;
}

.hero-scroll-hint span {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.4);
}

.scroll-arrow {
  width: 22px;
  height: 22px;
  border-right: 2px solid rgba(214, 178, 76, 0.5);
  border-bottom: 2px solid rgba(214, 178, 76, 0.5);
  transform: rotate(45deg);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.03em;
  padding: 14px 32px;
  border-radius: 50px;
  transition: all var(--transition-med);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.1);
  transform: scale(0);
  border-radius: inherit;
  transition: transform 0.4s ease;
}

.btn:hover::before {
  transform: scale(1);
}

.btn-primary {
  background: linear-gradient(135deg, var(--dna-gold) 0%, var(--dna-gold-dark) 100%);
  color: var(--midnight);
  box-shadow: var(--shadow-gold);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--glow-gold), var(--shadow-lg);
}

.btn-outline {
  background: transparent;
  color: var(--text-white);
  border: 1.5px solid rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(10px);
}

.btn-outline:hover {
  border-color: var(--dna-gold);
  color: var(--dna-gold);
  transform: translateY(-3px);
  box-shadow: var(--shadow-gold);
  background: rgba(214, 178, 76, 0.08);
}

.btn-red {
  background: linear-gradient(135deg, var(--cellular-red), var(--burgundy));
  color: var(--text-white);
  box-shadow: var(--shadow-red);
}

.btn-red:hover {
  transform: translateY(-3px);
  box-shadow: var(--glow-red);
}

.btn-icon {
  font-size: 1.1rem;
}

.btn-sm {
  padding: 10px 22px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 18px 44px;
  font-size: 1.05rem;
}

/* ============================================================
   SECTION UTILITIES
   ============================================================ */
.section {
  padding: var(--section-pad) 0;
  position: relative;
}

.section-dark {
  background: var(--midnight);
}

.section-darker {
  background: #0d0618;
}

.section-blue {
  background: linear-gradient(180deg, #080f2e 0%, #0E2361 100%);
}

.section-light {
  background: var(--ivory);
  color: var(--text-dark);
}

.section-grad {
  background: var(--grad-section);
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section-header {
  text-align: center;
  margin-bottom: 72px;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--dna-gold);
  background: rgba(214, 178, 76, 0.12);
  border: 1px solid rgba(214, 178, 76, 0.3);
  border-radius: 50px;
  padding: 6px 18px;
  margin-bottom: 20px;
}

.section-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  color: var(--text-white);
}

.section-title .gold {
  color: var(--dna-gold);
}

.section-subtitle {
  font-family: var(--font-body);
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.75;
}

.section-light .section-title {
  color: var(--text-dark);
}

.section-light .section-subtitle {
  color: var(--text-mid);
}

.section-light .section-tag {
  color: var(--cellular-red);
  background: rgba(153, 34, 33, 0.08);
  border-color: rgba(153, 34, 33, 0.25);
}

/* Divider */
.section-divider {
  width: 64px;
  height: 3px;
  background: var(--grad-gold);
  border-radius: 2px;
  margin: 20px auto 0;
}

.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, #d6b24c, transparent);
}

/* ============================================================
   REVEAL ANIMATIONS
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal-left.revealed {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal-right.revealed {
  opacity: 1;
  transform: translateX(0);
}

.reveal-delay-1 {
  transition-delay: 0.1s;
}

.reveal-delay-2 {
  transition-delay: 0.2s;
}

.reveal-delay-3 {
  transition-delay: 0.3s;
}

.reveal-delay-4 {
  transition-delay: 0.4s;
}

.reveal-delay-5 {
  transition-delay: 0.5s;
}

.reveal-delay-6 {
  transition-delay: 0.6s;
}

/* ============================================================
   ABOUT SECTION
   ============================================================ */
#about {
  background: linear-gradient(180deg, #0d0618 0%, #250915 100%);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-content .section-header {
  text-align: left;
  margin-bottom: 32px;
}

.about-description {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.85;
  margin-bottom: 36px;
  text-align: justify;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 40px;
}

.stat-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius);
  padding: 28px 24px;
  text-align: center;
  backdrop-filter: blur(10px);
  transition: all var(--transition-med);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--grad-gold);
  transform: scaleX(0);
  transition: transform var(--transition-med);
}

.stat-card:hover {
  border-color: rgba(214, 178, 76, 0.4);
  transform: translateY(-4px);
}

.stat-card:hover::before {
  transform: scaleX(1);
}

.stat-number {
  font-family: var(--font-numbers);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--dna-gold);
  display: block;
  line-height: 1;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
}

.about-visual {
  position: relative;
}

.about-visual-main {
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  position: relative;
  aspect-ratio: 4/5;
  background: var(--grad-card);
  border: 1px solid var(--glass-border);
}

.about-visual-main::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(92, 15, 29, 0.3) 0%, rgba(14, 35, 97, 0.4) 100%);
}

.about-visual-dna {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
}

.about-visual-badge {
  position: absolute;
  bottom: 24px;
  left: 24px;
  right: 24px;
  background: rgba(37, 9, 21, 0.85);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(214, 178, 76, 0.3);
  border-radius: var(--border-radius);
  padding: 20px;
  z-index: 2;
}

.about-visual-badge .badge-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--dna-gold);
  margin-bottom: 4px;
}

.about-visual-badge .badge-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.about-floating-card {
  position: absolute;
  top: -20px;
  right: -20px;
  background: rgba(14, 35, 97, 0.85);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(39, 83, 156, 0.4);
  border-radius: var(--border-radius);
  padding: 18px 22px;
  text-align: center;
  min-width: 140px;
  box-shadow: var(--shadow-blue);
}

.about-floating-card .fc-number {
  font-family: var(--font-numbers);
  font-size: 2rem;
  font-weight: 800;
  color: var(--molecular-blue);
  line-height: 1;
  margin-bottom: 4px;
}

.about-floating-card .fc-label {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 0.06em;
}

/* ============================================================
   HIGHLIGHTS
   ============================================================ */
#highlights {
  background: linear-gradient(180deg, #250915 0%, #0d0618 100%);
}

.highlights-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.highlight-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius);
  padding: 36px 28px;
  text-align: center;
  transition: all var(--transition-med);
  position: relative;
  overflow: hidden;
  cursor: default;
}

.highlight-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(153, 34, 33, 0.08), rgba(39, 83, 156, 0.08));
  opacity: 0;
  transition: opacity var(--transition-med);
}

.highlight-card:hover {
  transform: translateY(-8px);
  border-color: rgba(214, 178, 76, 0.35);
  box-shadow: var(--shadow-gold);
}

.highlight-card:hover::before {
  opacity: 1;
}

.highlight-icon {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin: 0 auto 24px;
  background: linear-gradient(135deg, rgba(214, 178, 76, 0.15), rgba(153, 34, 33, 0.15));
  border: 1px solid rgba(214, 178, 76, 0.25);
  transition: all var(--transition-med);
  position: relative;
  z-index: 1;
}

.highlight-card:hover .highlight-icon {
  background: linear-gradient(135deg, rgba(214, 178, 76, 0.25), rgba(153, 34, 33, 0.2));
  box-shadow: var(--glow-gold);
  transform: scale(1.1);
}

.highlight-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-white);
  margin-bottom: 10px;
  position: relative;
  z-index: 1;
}

.highlight-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
  position: relative;
  z-index: 1;
}

/* ============================================================
   WHY ATTEND
   ============================================================ */
#why-attend {
  background: linear-gradient(180deg, #0d0618 0%, var(--genomics-blue) 100%);
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.why-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius);
  padding: 32px 24px;
  transition: all var(--transition-med);
  position: relative;
  overflow: hidden;
}

.why-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--grad-blue);
  transform: scaleX(0);
  transition: transform var(--transition-med);
  transform-origin: left;
}

.why-card:hover {
  transform: translateY(-6px);
  border-color: rgba(39, 83, 156, 0.4);
  background: rgba(39, 83, 156, 0.1);
  box-shadow: var(--shadow-blue);
}

.why-card:hover::after {
  transform: scaleX(1);
}

.why-icon {
  font-size: 2.2rem;
  margin-bottom: 20px;
  display: block;
  transition: transform var(--transition-med);
}

.why-card:hover .why-icon {
  transform: scale(1.15) rotate(-5deg);
}

.why-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-white);
  margin-bottom: 10px;
}

.why-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ============================================================
   SCIENTIFIC THEMES
   ============================================================ */
#themes {
  background: linear-gradient(180deg, var(--genomics-blue) 0%, #0d0618 100%);
}

.themes-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}

.theme-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius);
  padding: 30px 20px;
  text-align: center;
  transition: all var(--transition-med);
  cursor: default;
  position: relative;
  overflow: hidden;
}

.theme-card::before {
  content: '';
  position: absolute;
  inset: -1px;
  background: linear-gradient(135deg, var(--dna-gold), var(--cellular-red), var(--molecular-blue));
  border-radius: inherit;
  opacity: 0;
  transition: opacity var(--transition-med);
  z-index: -1;
}

.theme-card:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: var(--shadow-md);
}

.theme-card:hover::before {
  opacity: 1;
}

.theme-card>* {
  position: relative;
  z-index: 1;
}

.theme-number {
  font-family: var(--font-numbers);
  font-size: 0.7rem;
  font-weight: 700;
  color: rgba(214, 178, 76, 0.5);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.theme-icon {
  font-size: 2rem;
  margin-bottom: 14px;
  display: block;
  transition: transform var(--transition-med);
}

.theme-card:hover .theme-icon {
  transform: scale(1.2);
}

.theme-name {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-white);
  line-height: 1.35;
}

/* ============================================================
   KEYNOTE SPEAKERS
   ============================================================ */
#speakers {
  background: linear-gradient(180deg, #0d0618 0%, #250915 100%);
}

.speakers-featured {
  margin-bottom: 60px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.featured-speaker-card {
  background: linear-gradient(135deg, rgba(14, 35, 97, 0.5) 0%, rgba(92, 15, 29, 0.5) 100%);
  border: 1px solid rgba(214, 178, 76, 0.25);
  border-radius: var(--border-radius-lg);
  padding: 48px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 48px;
  align-items: center;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.featured-speaker-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(214, 178, 76, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.featured-speaker-card .speaker-badge {
  position: absolute;
  top: 24px;
  right: 24px;
  background: var(--grad-gold);
  color: var(--midnight);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 6px 16px;
  border-radius: 50px;
}

.speaker-avatar {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid rgba(214, 178, 76, 0.4);
  box-shadow: var(--glow-gold);
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--genomics-blue), var(--burgundy));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.speaker-avatar svg {
  width: 80px;
  height: 80px;
  opacity: 0.7;
}

.speaker-info .speaker-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 2rem;
  color: var(--text-white);
  margin-bottom: 8px;
}

.speaker-info .speaker-role {
  font-size: 1.05rem;
  color: var(--dna-gold);
  font-weight: 600;
  margin-bottom: 6px;
}

.speaker-info .speaker-institution {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 6px;
}

.speaker-info .speaker-country {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.5);
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 20px;
}

.speaker-info .speaker-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.speaker-tag {
  background: rgba(39, 83, 156, 0.25);
  border: 1px solid rgba(39, 83, 156, 0.4);
  border-radius: 50px;
  padding: 5px 14px;
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.75);
}

.speakers-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.speaker-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius);
  padding: 32px 24px;
  text-align: center;
  transition: all var(--transition-med);
  position: relative;
  overflow: hidden;
}

.speaker-card:hover {
  transform: translateY(-8px);
  border-color: rgba(214, 178, 76, 0.3);
  box-shadow: var(--shadow-gold);
  background: rgba(214, 178, 76, 0.04);
}

.speaker-card .avatar-sm {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  margin: 0 auto 20px;
  border: 2px solid rgba(214, 178, 76, 0.3);
  overflow: hidden;
  background: linear-gradient(135deg, var(--genomics-blue), var(--burgundy));
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-med);
}

.speaker-card:hover .avatar-sm {
  border-color: rgba(214, 178, 76, 0.6);
  box-shadow: var(--glow-gold);
}

.speaker-card .avatar-sm svg {
  width: 50px;
  height: 50px;
  opacity: 0.6;
}

.speaker-card .s-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-white);
  margin-bottom: 6px;
}

.speaker-card .s-role {
  font-size: 0.8rem;
  color: var(--dna-gold);
  font-weight: 600;
  margin-bottom: 4px;
}

.speaker-card .s-institution {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: 4px;
}

.speaker-card .s-country {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.4);
}

.more-speakers-note {
  text-align: center;
  margin-top: 48px;
  padding: 32px;
  background: var(--glass-bg);
  border: 1px dashed rgba(214, 178, 76, 0.25);
  border-radius: var(--border-radius-lg);
}

.more-speakers-note p {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

/* ============================================================
   ORGANIZING COMMITTEE
   ============================================================ */
#committee {
  background: linear-gradient(180deg, #250915 0%, #0d0618 100%);
}

.committee-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 52px;
}

.tab-btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  padding: 10px 24px;
  border-radius: 50px;
  border: 1.5px solid rgba(255, 255, 255, 0.12);
  background: transparent;
  transition: all var(--transition-fast);
  cursor: pointer;
  letter-spacing: 0.03em;
}

.tab-btn:hover {
  color: var(--text-white);
  border-color: rgba(214, 178, 76, 0.3);
}

.tab-btn.active {
  background: linear-gradient(135deg, rgba(214, 178, 76, 0.2), rgba(153, 34, 33, 0.15));
  border-color: rgba(214, 178, 76, 0.5);
  color: var(--dna-gold);
  box-shadow: var(--shadow-gold);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.committee-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.committee-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius);
  padding: 28px 20px;
  text-align: center;
  transition: all var(--transition-med);
}

.committee-card:hover {
  transform: translateY(-4px);
  border-color: rgba(214, 178, 76, 0.25);
  background: rgba(214, 178, 76, 0.04);
}

.committee-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--burgundy), var(--genomics-blue));
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid rgba(214, 178, 76, 0.2);
}

.committee-avatar svg {
  width: 40px;
  height: 40px;
  opacity: 0.6;
}

.committee-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-white);
  margin-bottom: 6px;
}

.committee-role {
  font-size: 0.78rem;
  color: var(--dna-gold);
  font-weight: 600;
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.committee-dept {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.5);
  line-height: 1.4;
}

/* Chief Patron special styling */
.committee-card.chief {
  background: linear-gradient(135deg, rgba(92, 15, 29, 0.25), rgba(14, 35, 97, 0.2));
  border-color: rgba(214, 178, 76, 0.3);
}

/* ============================================================
   VENUE
   ============================================================ */
#venue {
  background: linear-gradient(180deg, #0d0618 0%, #0E2361 100%);
}

.venue-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.venue-info .venue-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.75rem;
  color: var(--text-white);
  margin-bottom: 8px;
}

.venue-info .venue-hall {
  font-size: 1.1rem;
  color: var(--dna-gold);
  font-weight: 600;
  margin-bottom: 24px;
}

.venue-info p {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 32px;
}

.venue-details {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 36px;
}

.venue-detail-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-sm);
  padding: 16px 20px;
}

.venue-detail-icon {
  font-size: 1.3rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.venue-detail-text .vd-label {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.4);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 3px;
}

.venue-detail-text .vd-value {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-white);
}

.venue-map {
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  border: 1px solid rgba(39, 83, 156, 0.4);
  box-shadow: var(--shadow-blue);
  position: relative;
}

.venue-map iframe {
  display: block;
  width: 100%;
  height: 420px;
  border: none;
  filter: hue-rotate(200deg) saturate(0.5) brightness(0.7);
}

.venue-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 60px;
}

.venue-card {
  background: var(--glass-bg-blue);
  border: 1px solid rgba(39, 83, 156, 0.3);
  border-radius: var(--border-radius);
  padding: 28px 24px;
  text-align: center;
  transition: all var(--transition-med);
}

.venue-card:hover {
  transform: translateY(-4px);
  border-color: rgba(214, 178, 76, 0.3);
  box-shadow: var(--shadow-gold);
}

.venue-card-icon {
  font-size: 2.5rem;
  margin-bottom: 14px;
}

.venue-card-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-white);
  margin-bottom: 8px;
}

.venue-card-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ============================================================
   ABOUT CHENNAI
   ============================================================ */
#chennai {
  background: linear-gradient(180deg, #0E2361 0%, #250915 100%);
}

.chennai-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.chennai-card {
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  position: relative;
  aspect-ratio: 3/4;
  cursor: default;
  transition: transform var(--transition-med);
}

.chennai-card:hover {
  transform: scale(1.02);
}

.chennai-card-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transition: transform 0.5s ease;
}

.chennai-card:hover .chennai-card-bg {
  transform: scale(1.05);
}

.chennai-card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(37, 9, 21, 0.95) 0%, rgba(37, 9, 21, 0.4) 50%, transparent 100%);
}

.chennai-card-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 24px 20px;
}

.chennai-card-emoji {
  font-size: 2rem;
  margin-bottom: 8px;
}

.chennai-card-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-white);
  margin-bottom: 6px;
}

.chennai-card-desc {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.5;
}

.chennai-weather {
  margin-top: 48px;
  background: var(--glass-bg);
  border: 1px solid rgba(214, 178, 76, 0.2);
  border-radius: var(--border-radius-lg);
  padding: 36px 40px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: center;
}

.chennai-weather h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--dna-gold);
  margin-bottom: 12px;
}

.chennai-weather p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.weather-stats {
  display: flex;
  gap: 32px;
}

.weather-stat {
  text-align: center;
}

.weather-stat .w-value {
  font-family: var(--font-numbers);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--dna-gold);
  display: block;
  line-height: 1;
}

.weather-stat .w-unit {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.5);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ============================================================
   TIMELINE
   ============================================================ */
#timeline {
  background: linear-gradient(180deg, #250915 0%, #0d0618 100%);
}

.timeline-container {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline-container::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(to bottom, transparent, rgba(214, 178, 76, 0.5) 10%, rgba(214, 178, 76, 0.5) 90%, transparent);
}

.timeline-item {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 32px;
  align-items: center;
  margin-bottom: 48px;
  position: relative;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-item:nth-child(odd) .tl-content {
  grid-column: 1;
  text-align: right;
}

.timeline-item:nth-child(odd) .tl-dot {
  grid-column: 2;
}

.timeline-item:nth-child(odd) .tl-spacer {
  grid-column: 3;
}

.timeline-item:nth-child(even) .tl-spacer {
  grid-column: 1;
}

.timeline-item:nth-child(even) .tl-dot {
  grid-column: 2;
}

.timeline-item:nth-child(even) .tl-content {
  grid-column: 3;
  text-align: left;
}

.tl-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--dna-gold);
  border: 3px solid var(--midnight);
  box-shadow: var(--glow-gold);
  flex-shrink: 0;
  position: relative;
  z-index: 1;
  transition: all var(--transition-med);
}

.timeline-item:hover .tl-dot {
  transform: scale(1.5);
  box-shadow: 0 0 20px rgba(214, 178, 76, 0.8);
}

.tl-content {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius);
  padding: 24px 28px;
  transition: all var(--transition-med);
}

.timeline-item:hover .tl-content {
  border-color: rgba(214, 178, 76, 0.3);
  background: rgba(214, 178, 76, 0.04);
  transform: translateY(-2px);
}

.tl-date {
  font-family: var(--font-numbers);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--dna-gold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.tl-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-white);
  margin-bottom: 6px;
}

.tl-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* ============================================================
   SPONSORS
   ============================================================ */
#sponsors {
  background: linear-gradient(180deg, #0d0618 0%, #250915 100%);
}

.sponsors-carousel-wrapper {
  overflow: hidden;
  position: relative;
  mask-image: linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
}

.sponsors-track {
  display: flex;
  gap: 32px;
  animation: infiniteScroll 30s linear infinite;
  width: max-content;
}

.sponsors-track:hover {
  animation-play-state: paused;
}

.sponsor-logo {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius);
  padding: 28px 40px;
  min-width: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.sponsor-logo:hover {
  border-color: rgba(214, 178, 76, 0.4);
  background: rgba(214, 178, 76, 0.06);
  transform: scale(1.04);
}

.sponsor-logo .s-icon {
  font-size: 2.5rem;
}

.sponsor-logo .s-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
  text-align: center;
}

.sponsor-logo .s-type {
  font-size: 0.7rem;
  color: var(--dna-gold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.sponsors-tiers {
  margin-top: 60px;
  text-align: center;
}

.sponsors-tiers h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 24px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.sponsor-tier-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

.sponsor-tier-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  padding: 10px 22px;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.sponsor-tier-badge:hover {
  border-color: rgba(214, 178, 76, 0.4);
  color: var(--dna-gold);
}

.tier-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.tier-platinum {
  background: #E8E8F0;
  box-shadow: 0 0 8px rgba(232, 232, 240, 0.6);
}

.tier-gold {
  background: var(--dna-gold);
  box-shadow: 0 0 8px rgba(214, 178, 76, 0.6);
}

.tier-silver {
  background: #A8A8B8;
  box-shadow: 0 0 8px rgba(168, 168, 184, 0.6);
}

.tier-bronze {
  background: #CD7F32;
  box-shadow: 0 0 8px rgba(205, 127, 50, 0.6);
}

/* ============================================================
   REGISTRATION CTA
   ============================================================ */
#register {
  background: linear-gradient(135deg, #0E2361 0%, #250915 40%, #5C0F1D 100%);
  position: relative;
  overflow: hidden;
}

#register::before {
  content: '';
  position: absolute;
  top: -30%;
  left: -10%;
  width: 60%;
  height: 160%;
  background: radial-gradient(ellipse, rgba(214, 178, 76, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

#register::after {
  content: '';
  position: absolute;
  bottom: -30%;
  right: -10%;
  width: 50%;
  height: 150%;
  background: radial-gradient(ellipse, rgba(39, 83, 156, 0.12) 0%, transparent 60%);
  pointer-events: none;
}

.register-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.register-content .section-title {
  font-size: clamp(2rem, 4vw, 3.2rem);
  margin-bottom: 24px;
}

.register-content p {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.72);
  margin-bottom: 48px;
  line-height: 1.7;
}

.register-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  margin-bottom: 40px;
}

.register-note {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.4);
}

/* ============================================================
   FAQ
   ============================================================ */
#faq {
  background: var(--midnight);
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 1000px;
  margin: 0 auto;
}

.faq-item {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: rgba(214, 178, 76, 0.25);
}

.faq-item.open {
  border-color: rgba(214, 178, 76, 0.4);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 24px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-white);
  cursor: pointer;
  transition: color var(--transition-fast);
  user-select: none;
}

.faq-item.open .faq-question {
  color: var(--dna-gold);
}

.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(214, 178, 76, 0.1);
  border: 1px solid rgba(214, 178, 76, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1rem;
  color: var(--dna-gold);
  transition: transform var(--transition-med);
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding var(--transition-med);
  padding: 0 24px;
}

.faq-answer.open {
  max-height: 300px;
  padding-bottom: 24px;
}

.faq-answer p {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.75;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 16px;
}

/* ============================================================
   CONTACT
   ============================================================ */
#contact {
  background: linear-gradient(180deg, var(--midnight) 0%, #0E2361 100%);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.contact-info h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.75rem;
  color: var(--text-white);
  margin-bottom: 8px;
}

.contact-info .sub-org {
  font-size: 0.95rem;
  color: var(--dna-gold);
  margin-bottom: 4px;
  font-weight: 500;
}

.contact-info .dept {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: 4px;
}

.contact-info .institution {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.85);
  font-weight: 600;
  margin-bottom: 32px;
}

.contact-items {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-sm);
  padding: 16px 20px;
  transition: all var(--transition-fast);
}

.contact-item:hover {
  border-color: rgba(214, 178, 76, 0.3);
  background: rgba(214, 178, 76, 0.04);
}

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(214, 178, 76, 0.15), rgba(153, 34, 33, 0.15));
  border: 1px solid rgba(214, 178, 76, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.contact-text .c-label {
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.4);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 2px;
}

.contact-text .c-value {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-white);
}

.contact-text .c-value a {
  color: var(--dna-gold);
}

.contact-text .c-value a:hover {
  text-decoration: underline;
}

.contact-form-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-lg);
  padding: 40px;
  backdrop-filter: blur(10px);
}

.contact-form-card h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--text-white);
  margin-bottom: 28px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.6);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 1.5px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-sm);
  padding: 13px 16px;
  color: var(--text-white);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: rgba(214, 178, 76, 0.5);
  background: rgba(214, 178, 76, 0.05);
  box-shadow: 0 0 0 3px rgba(214, 178, 76, 0.1);
}

.form-group select option {
  background: var(--midnight);
}

.form-group textarea {
  resize: vertical;
  min-height: 110px;
}

/* ============================================================
   FOOTER
   ============================================================ */
#footer {
  background: #0d0618;
  border-top: 1px solid rgba(214, 178, 76, 0.15);
}

.footer-top {
  padding: 72px 0 52px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
}

.footer-brand .brand-logo {
  margin-bottom: 20px;
}

.footer-brand .brand-logo img {
  height: 56px;
  width: auto;
  filter: drop-shadow(0 2px 8px rgba(214, 178, 76, 0.3));
}

.footer-brand .brand-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--dna-gold);
  margin-bottom: 4px;
}

.footer-brand .brand-sub {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.45);
  line-height: 1.55;
  margin-bottom: 24px;
}

.footer-social {
  display: flex;
  gap: 10px;
}

.social-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.6);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.social-btn:hover {
  background: rgba(214, 178, 76, 0.15);
  border-color: rgba(214, 178, 76, 0.4);
  color: var(--dna-gold);
  transform: translateY(-3px);
}

.footer-col h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-white);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 24px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col ul li a {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.5);
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-col ul li a::before {
  content: '›';
  color: var(--dna-gold);
  font-size: 1rem;
  opacity: 0.6;
}

.footer-col ul li a:hover {
  color: var(--dna-gold);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 24px 0;
}

.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.35);
}

.footer-bottom p span {
  color: var(--dna-gold);
}

/* Back to Top */
#back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 500;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--grad-gold);
  color: var(--midnight);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-gold);
  transition: all var(--transition-med);
  opacity: 0;
  transform: scale(0) translateY(10px);
  pointer-events: none;
}

#back-to-top.visible {
  opacity: 1;
  transform: scale(1) translateY(0);
  pointer-events: all;
}

#back-to-top:hover {
  transform: scale(1.1) translateY(-3px);
  box-shadow: var(--glow-gold);
}

/* ============================================================
   DNA SVG VISUALIZATION (inline)
   ============================================================ */
.dna-visual-container {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.6;
}

/* ============================================================
   KEYFRAME ANIMATIONS
   ============================================================ */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-24px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes logoFloat {

  0%,
  100% {
    transform: translateY(0px) rotate(-1deg);
  }

  50% {
    transform: translateY(-12px) rotate(1deg);
  }
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: 0.5;
    transform: scale(1.5);
  }
}

@keyframes scrollBounce {

  0%,
  100% {
    transform: translateX(-50%) translateY(0);
  }

  50% {
    transform: translateX(-50%) translateY(8px);
  }
}

@keyframes infiniteScroll {
  0% {
    transform: translateX(0);
  }

  100% {
    transform: translateX(-50%);
  }
}

@keyframes glowPulse {

  0%,
  100% {
    box-shadow: 0 0 20px rgba(214, 178, 76, 0.3);
  }

  50% {
    box-shadow: 0 0 40px rgba(214, 178, 76, 0.6), 0 0 80px rgba(214, 178, 76, 0.2);
  }
}

@keyframes rotateSlow {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

@keyframes moleculeFloat {

  0%,
  100% {
    transform: translateY(0) rotate(0deg);
  }

  33% {
    transform: translateY(-15px) rotate(120deg);
  }

  66% {
    transform: translateY(8px) rotate(240deg);
  }
}

/* ============================================================
   GLASSMORPHISM UTILITIES
   ============================================================ */
.glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.glass-dark {
  background: var(--glass-bg-dark);
  border: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(20px);
}

/* ============================================================
   RESPONSIVE — TABLET (1024px)
   ============================================================ */
@media (max-width: 1100px) {
  :root {
    --section-pad: 80px;
  }

  .nav-links {
    gap: 2px;
  }

  .nav-links a {
    padding: 7px 10px;
    font-size: 0.82rem;
  }

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

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

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

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

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

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .venue-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================================
   RESPONSIVE — MOBILE LARGE (768px)
   ============================================================ */
@media (max-width: 768px) {
  :root {
    --section-pad: 60px;
  }

  /* Nav */
  .nav-links {
    display: none;
  }

  .nav-hamburger {
    display: flex;
  }

  .nav-logo-text {
    display: none;
  }

  /* Hero */
  .hero-meta {
    gap: 12px;
  }

  .hero-meta-item {
    padding: 8px 14px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    justify-content: center;
  }

  /* About */
  .about-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about-visual {
    display: none;
  }

  /* Highlights */
  .highlights-grid {
    grid-template-columns: 1fr;
  }

  /* Why Attend */
  .why-grid {
    grid-template-columns: 1fr;
  }

  /* Themes */
  .themes-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Speakers */
  .featured-speaker-card {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 28px;
    padding: 32px 24px;
  }

  .speaker-info .speaker-tags {
    justify-content: center;
  }

  .speaker-info .speaker-country {
    justify-content: center;
  }

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

  /* Committee */
  .committee-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Venue */
  .venue-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .venue-cards {
    grid-template-columns: 1fr;
  }

  /* Chennai */
  .chennai-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .chennai-weather {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  /* Timeline */
  .timeline-container::before {
    left: 20px;
  }

  .timeline-item {
    grid-template-columns: auto 1fr;
    gap: 16px;
  }

  .timeline-item:nth-child(odd) .tl-content,
  .timeline-item:nth-child(even) .tl-content {
    grid-column: 2;
    text-align: left;
  }

  .timeline-item:nth-child(odd) .tl-dot,
  .timeline-item:nth-child(even) .tl-dot {
    grid-column: 1;
    grid-row: 1;
  }

  .tl-spacer {
    display: none;
  }

  /* FAQ */
  .faq-grid {
    grid-template-columns: 1fr;
  }

  /* Contact */
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom-inner {
    flex-direction: column;
    text-align: center;
  }

  /* Register */
  .register-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .register-actions .btn {
    justify-content: center;
  }
}

/* ============================================================
   RESPONSIVE — MOBILE SMALL (480px)
   ============================================================ */
@media (max-width: 480px) {
  .hero-title {
    font-size: 1.8rem;
  }

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

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

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

  .about-stats {
    grid-template-columns: 1fr 1fr;
  }

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

  .hero-meta {
    flex-direction: column;
  }

  #back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }
}