/* ============================================
   ICEEDS 2026 – Premium Design System
   International Conference on Environment, 
   Energy and Data Science
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=Sora:wght@400;500;600;700;800&display=swap');

:root {
  /* Nature-inspired color palette */
  --emerald-900: #064e3b;
  --emerald-800: #065f46;
  --emerald-700: #047857;
  --emerald-600: #059669;
  --emerald-500: #10b981;
  --emerald-400: #34d399;
  --emerald-300: #6ee7b7;
  --emerald-200: #a7f3d0;
  --emerald-100: #d1fae5;
  --emerald-50: #ecfdf5;

  --gold-500: #f59e0b;
  --gold-400: #fbbf24;
  --gold-300: #fcd34d;
  --gold-200: #fde68a;

  --sky-500: #0ea5e9;
  --sky-400: #38bdf8;

  --dark-950: #030712;
  --dark-900: #0a0f1a;
  --dark-800: #111827;
  --dark-700: #1e293b;
  --dark-600: #334155;
  --dark-500: #475569;

  --white: #ffffff;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;

  --transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15);
  --shadow-glow: 0 0 40px rgba(16, 185, 129, 0.15);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--gray-50);
  color: var(--gray-700);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6, .nav-logo {
  font-family: 'Sora', sans-serif;
  color: var(--dark-800);
  font-weight: 700;
  line-height: 1.2;
}

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

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

.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ===== NAVIGATION ===== */
#main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  transition: var(--transition);
}

#main-nav.scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 72px;
}

.nav-logo {
  font-size: 1.4rem;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 800;
  color: var(--emerald-800);
  letter-spacing: -0.02em;
}

.nav-logo span {
  background: linear-gradient(135deg, var(--emerald-500), var(--sky-500));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--gray-600);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.01em;
  transition: var(--transition-fast);
  white-space: nowrap;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  position: relative;
}

.nav-links a:hover {
  color: var(--emerald-700);
  background: var(--emerald-50);
}

.nav-cta {
  background: linear-gradient(135deg, var(--emerald-600), var(--emerald-700)) !important;
  color: var(--white) !important;
  padding: 0.6rem 1.4rem !important;
  border-radius: var(--radius-full) !important;
  font-size: 0.8rem !important;
  letter-spacing: 0.02em;
  box-shadow: 0 2px 12px rgba(5, 150, 105, 0.3);
  transition: var(--transition) !important;
}

.nav-cta:hover {
  background: linear-gradient(135deg, var(--emerald-700), var(--emerald-800)) !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(5, 150, 105, 0.4) !important;
}

/* Mobile Toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 10;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--dark-800);
  margin: 6px 0;
  transition: var(--transition);
  border-radius: 2px;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 6px);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -6px);
}

/* ===== HERO SECTION ===== */
#hero {
  padding-top: 72px;
  min-height: 100vh;
  display: flex;
  align-items: center;
  color: var(--white);
  text-align: center;
  position: relative;
  overflow: hidden;
  background: var(--dark-900);
}

.hero-bg-slider {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-bg-slider::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(5, 150, 105, 0.25) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(14, 165, 233, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 100%, rgba(245, 158, 11, 0.1) 0%, transparent 40%),
    linear-gradient(180deg, rgba(3, 7, 18, 0.55) 0%, rgba(6, 78, 59, 0.65) 50%, rgba(3, 7, 18, 0.8) 100%);
  z-index: 1;
}

.bg-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  opacity: 0;
  animation: bgFadeInOut 25s infinite;
  filter: brightness(0.7) contrast(1.1);
}

.bg-slide:nth-child(1) { animation-delay: 0s; }
.bg-slide:nth-child(2) { animation-delay: 5s; }
.bg-slide:nth-child(3) { animation-delay: 10s; }
.bg-slide:nth-child(4) { animation-delay: 15s; }
.bg-slide:nth-child(5) { animation-delay: 20s; }

@keyframes bgFadeInOut {
  0% { opacity: 0; transform: scale(1.08); }
  4% { opacity: 1; }
  20% { opacity: 1; }
  24% { opacity: 0; transform: scale(1); }
  100% { opacity: 0; transform: scale(1.08); }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 960px;
  margin: 0 auto;
  padding: 5rem 2rem;
}

.hero-badge {
  background: linear-gradient(135deg, var(--emerald-400), var(--emerald-500));
  color: var(--emerald-900);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.25rem;
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 2rem;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 20px rgba(16, 185, 129, 0.3);
  animation: badgePulse 3s ease-in-out infinite;
}

@keyframes badgePulse {
  0%, 100% { box-shadow: 0 4px 20px rgba(16, 185, 129, 0.3); }
  50% { box-shadow: 0 4px 30px rgba(16, 185, 129, 0.5); }
}

.hero-title {
  font-size: clamp(2.2rem, 5.5vw, 4.2rem);
  color: var(--white);
  margin-bottom: 1.25rem;
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.hero-title .accent-word {
  background: linear-gradient(135deg, var(--emerald-300), var(--gold-400));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.2rem;
  margin-bottom: 2.5rem;
  font-weight: 400;
  opacity: 0.8;
  color: var(--emerald-200);
  line-height: 1.6;
}

.hero-info-bar {
  display: flex;
  justify-content: center;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.info-chip {
  background: rgba(255, 255, 255, 0.08);
  padding: 0.875rem 1.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: var(--transition);
}

.info-chip:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

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

.chip-value {
  font-weight: 600;
  font-size: 0.95rem;
}

.hero-cta-group {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-btn {
  padding: 0.9rem 2.25rem;
  border-radius: var(--radius-full);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  transition: var(--transition);
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-btn.primary {
  background: linear-gradient(135deg, var(--emerald-400), var(--emerald-500));
  color: var(--emerald-900);
  box-shadow: 0 4px 20px rgba(16, 185, 129, 0.35);
}

.hero-btn.primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(16, 185, 129, 0.5);
}

.hero-btn.secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--white);
  border: 1.5px solid rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(10px);
}

.hero-btn.secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.4);
  transform: translateY(-3px);
}

/* Floating particles behind hero */
#hero::before {
  content: '';
  position: absolute;
  top: 20%;
  left: 10%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.12) 0%, transparent 70%);
  border-radius: 50%;
  z-index: 1;
  animation: floatOrb 8s ease-in-out infinite;
}

#hero::after {
  content: '';
  position: absolute;
  bottom: 15%;
  right: 8%;
  width: 250px;
  height: 250px;
  background: radial-gradient(circle, rgba(14, 165, 233, 0.1) 0%, transparent 70%);
  border-radius: 50%;
  z-index: 1;
  animation: floatOrb 10s ease-in-out infinite reverse;
}

@keyframes floatOrb {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -20px) scale(1.05); }
  66% { transform: translate(-20px, 15px) scale(0.95); }
}

/* ===== SECTION STYLES ===== */
.section {
  padding: 6rem 0;
  position: relative;
}

.section-bg {
  background: var(--white);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-tag {
  color: var(--emerald-600);
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 3px;
  font-size: 0.75rem;
  display: inline-block;
  margin-bottom: 0.75rem;
  position: relative;
  padding: 0.4rem 1rem;
  background: var(--emerald-50);
  border-radius: var(--radius-full);
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  position: relative;
  padding-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 3px;
  background: linear-gradient(90deg, var(--emerald-400), var(--sky-400));
  border-radius: var(--radius-full);
}

/* ===== ABOUT SECTION ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 4rem;
  align-items: center;
}

.objective-card {
  background: var(--white);
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--emerald-500);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.objective-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--emerald-50) 0%, transparent 60%);
  z-index: 0;
}

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

.objective-card p {
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--gray-600);
}

.about-highlights {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.highlight-item {
  display: flex;
  gap: 1.25rem;
  padding: 1.5rem;
  border-radius: var(--radius-md);
  background: var(--white);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-100);
  transition: var(--transition);
}

.highlight-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--emerald-200);
}

.highlight-icon {
  font-size: 1.4rem;
  background: linear-gradient(135deg, var(--emerald-100), var(--emerald-50));
  color: var(--emerald-600);
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.highlight-item h4 {
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
  color: var(--dark-800);
}

.highlight-item p {
  font-size: 0.9rem;
  color: var(--gray-500);
}

/* ===== TRACKS ===== */
.tracks-nav {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.track-tab {
  background: var(--gray-50);
  border: 1.5px solid var(--gray-200);
  padding: 0.7rem 1.6rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.88rem;
  transition: var(--transition);
  border-radius: var(--radius-full);
  color: var(--gray-600);
  font-family: 'Plus Jakarta Sans', sans-serif;
}

.track-tab.active,
.track-tab:hover {
  background: linear-gradient(135deg, var(--emerald-600), var(--emerald-700));
  color: var(--white);
  border-color: var(--emerald-600);
  box-shadow: 0 4px 15px rgba(5, 150, 105, 0.3);
}

.track-panel {
  display: none;
  background: var(--white);
  padding: 2.5rem;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  animation: panelFade 0.5s ease-out;
}

@keyframes panelFade {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.track-panel.active {
  display: block;
}

.track-header {
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.track-number {
  font-size: 3.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--emerald-200), var(--emerald-100));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.track-info h3 {
  font-size: 1.5rem;
  color: var(--dark-800);
}

.track-info p {
  color: var(--gray-500);
  margin-top: 0.25rem;
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 0.75rem;
}

.topic-item {
  background: var(--gray-50);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border: 1px solid transparent;
  transition: var(--transition);
  color: var(--gray-600);
}

.topic-item:hover {
  border-color: var(--emerald-300);
  background: var(--emerald-50);
  color: var(--emerald-800);
  transform: translateX(4px);
}

.topic-dot {
  color: var(--emerald-500);
  font-size: 0.6rem;
}

/* ===== SUBMISSION ===== */
.submission-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.submission-card {
  background: var(--white) !important;
  padding: 2.5rem !important;
  border-radius: var(--radius-lg) !important;
  box-shadow: var(--shadow-md) !important;
  border: 1px solid var(--gray-100) !important;
  transition: var(--transition);
}

.submission-card:hover {
  box-shadow: var(--shadow-lg) !important;
  transform: translateY(-3px);
}

.submission-card h3 {
  color: var(--emerald-800) !important;
  font-size: 1.4rem !important;
}

/* ===== DATES & PUBLICATION ===== */
.dates-pub-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.timeline-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.1rem 1.25rem;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.timeline-item:hover {
  border-color: var(--emerald-300);
  box-shadow: var(--shadow-sm);
  transform: translateX(4px);
}

.timeline-item.highlight {
  border-left: 4px solid var(--emerald-500);
  background: linear-gradient(90deg, var(--emerald-50) 0%, var(--white) 100%);
}

.timeline-label {
  font-weight: 700;
  color: var(--dark-800);
  font-size: 0.95rem;
}

.timeline-date {
  font-weight: 600;
  color: var(--emerald-600);
  font-size: 0.92rem;
  white-space: nowrap;
}

/* Cards */
.pub-card {
  background: var(--white);
  padding: 2rem;
  border: 1px solid var(--gray-200);
  margin-bottom: 1.5rem;
  border-radius: var(--radius-md);
}

.index-badges {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.index-badge {
  background: linear-gradient(135deg, var(--emerald-700), var(--emerald-800));
  color: var(--white);
  padding: 0.35rem 0.9rem;
  font-size: 0.75rem;
  border-radius: var(--radius-full);
  font-weight: 600;
}

/* ===== REGISTRATION ===== */
#registration .reveal {
  border-radius: var(--radius-lg) !important;
  border-top: none !important;
  box-shadow: var(--shadow-md) !important;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

#registration .reveal::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--emerald-400), var(--sky-400));
}

#registration .reveal:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl) !important;
}

/* ===== VENUE ===== */
.venue-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.venue-gallery img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 4/3;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.venue-gallery img:first-child {
  grid-column: 1 / -1;
  aspect-ratio: 16/9;
}

.venue-gallery img:hover {
  transform: scale(1.03);
  box-shadow: var(--shadow-xl);
  z-index: 1;
  position: relative;
}

/* ===== COMMITTEE ===== */
.committee-category {
  margin-bottom: 3.5rem;
}

.committee-category h3 {
  font-size: 1.6rem;
  color: var(--dark-800);
  margin-bottom: 1.75rem;
  text-align: center;
  position: relative;
  padding-bottom: 0.75rem;
}

.committee-category h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 3px;
  background: linear-gradient(90deg, var(--gold-400), var(--gold-500));
  border-radius: var(--radius-full);
}

.committee-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.committee-card {
  background: var(--white);
  padding: 1.75rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-100);
  transition: var(--transition);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.committee-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--emerald-400), var(--emerald-600));
}

.committee-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--emerald-200);
}

.committee-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--dark-800);
  margin-bottom: 0.4rem;
  font-family: 'Sora', sans-serif;
}

.committee-affiliation {
  font-size: 0.9rem;
  color: var(--gray-500);
  line-height: 1.5;
}

.tpc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.75rem;
}

.tpc-item {
  background: var(--gray-50);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--gray-300);
  transition: var(--transition);
}

.tpc-item:hover {
  border-left-color: var(--emerald-500);
  background: var(--white);
  box-shadow: var(--shadow-sm);
  transform: translateX(4px);
}

.tpc-name {
  font-weight: 600;
  color: var(--dark-800);
  margin-bottom: 0.2rem;
  font-size: 0.92rem;
}

.tpc-affil {
  font-size: 0.82rem;
  color: var(--gray-500);
}

/* ===== FOOTER ===== */
footer {
  background: linear-gradient(180deg, var(--dark-900) 0%, var(--dark-950) 100%);
  color: var(--white);
  padding: 5rem 0 2rem;
  position: relative;
  overflow: hidden;
}

footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--emerald-500), transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand h3 {
  color: var(--white);
  margin-bottom: 0.75rem;
  font-size: 1.3rem;
}

.footer-brand p {
  color: var(--gray-400);
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-links-col h4 {
  color: var(--emerald-400);
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 2px;
}

.footer-links-col ul {
  list-style: none;
}

.footer-links-col li {
  margin-bottom: 0.6rem;
}

.footer-links-col a {
  color: var(--gray-400);
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition-fast);
}

.footer-links-col a:hover {
  color: var(--emerald-300);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 2rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--gray-500);
}

/* ===== ANIMATIONS ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Stagger animation delay for children */
.about-highlights .highlight-item:nth-child(2) { transition-delay: 0.1s; }
.committee-grid .committee-card:nth-child(2) { transition-delay: 0.1s; }
.committee-grid .committee-card:nth-child(3) { transition-delay: 0.2s; }

/* Smooth scroll indicator */
@keyframes scrollHint {
  0%, 100% { transform: translateY(0); opacity: 0.6; }
  50% { transform: translateY(8px); opacity: 1; }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 992px) {
  .about-grid,
  .dates-pub-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .section {
    padding: 4rem 0;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 6rem 2rem 2rem;
    gap: 0.5rem;
    z-index: 5;
  }

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

  .nav-links a {
    font-size: 1.1rem;
    padding: 1rem;
    text-align: center;
    border-radius: var(--radius-md);
  }

  .nav-toggle {
    display: block;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-info-bar {
    flex-direction: column;
    align-items: center;
  }

  .info-chip {
    width: 100%;
    max-width: 340px;
    justify-content: center;
  }

  .hero-cta-group {
    flex-direction: column;
    align-items: center;
  }

  .hero-btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  .section-title {
    font-size: 1.75rem;
  }

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

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

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

@media (max-width: 480px) {
  .container {
    padding: 0 1.25rem;
  }

  .hero-content {
    padding: 3rem 1rem;
  }

  .track-panel {
    padding: 1.5rem;
  }

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