/* ============================================================
   ICGIESTec 2026 - International Conference Website
   Style.css - Complete Design System (ICOPIA-Aligned)
   ============================================================ */

/* ============================================================
   1. CSS CUSTOM PROPERTIES (DESIGN TOKENS)
   ============================================================ */
:root {
  /* Brand Colors — Dark Blue & Gold */
  --primary: #0D47A1;
  --primary-dark: #0A3680;
  --primary-light: #1565C0;
  --secondary: #1976D2;
  --secondary-dark: #1260A8;
  --secondary-light: #42A5F5;
  --accent: #FFC107;
  --accent-dark: #FFA000;
  --accent-light: #FFD54F;

  /* Neutral Colors */
  --bg-white: #FFFFFF;
  --bg-light: #F5F7FA;
  --bg-alt: #EDF1F7;
  --text-dark: #1A1A2E;
  --text-body: #4A4A68;
  --text-muted: #7A7A96;
  --border-light: #E0E6ED;
  --footer-dark: #0B1F3A;
  --footer-darker: #061326;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #0D47A1 0%, #1976D2 100%);
  --gradient-hero: linear-gradient(135deg, #0D47A1 0%, #0A3680 50%, #1565C0 100%);
  --gradient-accent: linear-gradient(135deg, #FFC107 0%, #FFA000 100%);
  --gradient-card: linear-gradient(180deg, rgba(13, 71, 161, 0.03) 0%, rgba(25, 118, 210, 0.06) 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0.05) 100%);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 16px 60px rgba(0, 0, 0, 0.15);
  --shadow-glow: 0 0 30px rgba(13, 71, 161, 0.2);
  --shadow-accent-glow: 0 0 30px rgba(255, 193, 7, 0.3);

  /* Typography */
  --font-heading: 'Poppins', sans-serif;
  --font-body: 'Poppins', sans-serif;

  /* Spacing */
  --section-py: 100px;
  --section-py-sm: 60px;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 50%;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-spring: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}


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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  color: var(--text-dark);
  font-weight: 700;
  line-height: 1.3;
}

a {
  text-decoration: none;
  color: var(--primary);
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--secondary);
}

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

/* ============================================================
   3. PRELOADER
   ============================================================ */
#preloader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-white);
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

#preloader.loaded {
  opacity: 0;
  visibility: hidden;
}

.preloader-inner {
  text-align: center;
}

.preloader-spinner {
  width: 60px;
  height: 60px;
  border: 4px solid var(--border-light);
  border-top-color: var(--primary);
  border-right-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 20px;
}

.preloader-text {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 2px;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ============================================================
   4. NAVBAR
   ============================================================ */
.navbar {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  padding: 12px 0;
  transition: all var(--transition-base);
  z-index: 1050;
}


.navbar.scrolled {
  padding: 6px 0;
  box-shadow: var(--shadow-md);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--primary) !important;
}

.navbar-brand img {
  height: 40px;
  width: auto;
}

.navbar-brand span {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar-nav .nav-link {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 0.85rem;
  color: var(--text-body) !important;
  padding: 8px 12px !important;
  position: relative;
  transition: color var(--transition-fast);
}

.navbar-nav .nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 12px;
  right: 12px;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 1px;
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

/* Override Bootstrap dropdown carets */
.navbar-nav .nav-link.dropdown-toggle::after {
  position: static;
  border: none;
  content: none;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  color: var(--primary) !important;
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after {
  transform: scaleX(1);
}

.btn-register-nav {
  background: var(--gradient-accent);
  color: var(--footer-dark) !important;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.82rem;
  padding: 8px 24px;
  border-radius: 50px;
  border: none;
  letter-spacing: 0.5px;
  transition: all var(--transition-base);
}

.btn-register-nav:hover {
  transform: translateY(-2px);
  color: var(--footer-dark) !important;
}

/* Dropdown Menus */
.navbar-nav .dropdown-menu {
  background-color: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 10px 0;
  margin-top: 15px;
  transition: all var(--transition-base);
}

.navbar-nav .dropdown-item {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 0.85rem;
  color: var(--text-body);
  padding: 8px 20px;
  transition: all var(--transition-fast);
}

.navbar-nav .dropdown-item:hover {
  background-color: rgba(13, 71, 161, 0.05);
  color: var(--primary);
}


/* Open dropdowns on hover for desktops */
@media (min-width: 1200px) {
  .navbar-nav .dropdown:hover .dropdown-menu {
    display: block;
    margin-top: 0;
    opacity: 1;
    visibility: visible;
  }
}


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

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

.hero-bg-image {
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  opacity: 0.3;
}

/* Pagination — di luar swiper, position absolute relatif ke #hero */
.hero-swiper-pagination {
  position: absolute !important;
  bottom: 30px !important;
  left: 50% !important;
  transform: translateX(-50%) !important;
  width: auto !important;
  z-index: 10 !important;
  pointer-events: all !important;
}

.hero-swiper-pagination .swiper-pagination-bullet {
  background: rgba(255, 255, 255, 0.4);
  opacity: 1;
  width: 8px;
  height: 8px;
  transition: all 0.3s ease;
}

.hero-swiper-pagination .swiper-pagination-bullet-active {
  background: var(--accent) !important;
  width: 24px;
  border-radius: 4px;
}

/* Navigation buttons — di luar swiper, position absolute relatif ke #hero */
.hero-swiper-button-next,
.hero-swiper-button-prev {
  position: absolute !important;
  top: 50% !important;
  transform: translateY(-50%) !important;
  color: #fff !important;
  opacity: 0.3;
  transition: opacity var(--transition-base);
  width: 50px !important;
  height: 50px !important;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 50%;
  z-index: 10 !important;
  pointer-events: all !important;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-swiper-button-next {
  right: 20px !important;
  left: auto !important;
}

.hero-swiper-button-prev {
  left: 20px !important;
  right: auto !important;
}

.hero-swiper-button-next:hover,
.hero-swiper-button-prev:hover {
  opacity: 0.8;
  color: var(--accent) !important;
}

.hero-swiper-button-next::after,
.hero-swiper-button-prev::after {
  font-size: 18px !important;
  font-weight: bold;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg,
      rgba(11, 31, 58, 0.9) 0%,
      rgba(13, 71, 161, 0.75) 50%,
      rgba(25, 118, 210, 0.65) 100%);
  z-index: 1;
}

/* Animated particles */
.hero-particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
  overflow: hidden;
  pointer-events: none;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  animation: float-particle linear infinite;
}

@keyframes float-particle {
  0% {
    transform: translateY(100vh) scale(0);
    opacity: 0;
  }

  10% {
    opacity: 1;
  }

  90% {
    opacity: 1;
  }

  100% {
    transform: translateY(-10vh) scale(1);
    opacity: 0;
  }
}

.hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  padding: 140px 0 80px;
  width: 100%;
}

.conference-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50px;
  padding: 8px 24px;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 500;
  color: #fff;
  margin-bottom: 24px;
  animation: fadeInDown 0.8s ease;
}

.conference-badge i {
  color: var(--accent);
}

.hero-title {
  font-size: 2.8rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 20px;
  line-height: 1.2;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-title .highlight {
  background: linear-gradient(135deg, var(--accent) 0%, #FFD700 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-theme {
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.85);
  max-width: 800px;
  margin: 0 auto 30px;
  font-weight: 300;
  line-height: 1.6;
  animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
  margin-bottom: 36px;
  animation: fadeInUp 0.8s ease 0.5s both;
}

.hero-info-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.95rem;
  font-weight: 500;
}

.hero-info-item i {
  color: var(--accent);
  font-size: 1.1rem;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 50px;
  animation: fadeInUp 0.8s ease 0.6s both;
}

.btn-hero-primary {
  background: var(--gradient-accent);
  color: var(--footer-dark) !important;
  font-family: var(--font-heading);
  font-weight: 700;
  padding: 14px 40px;
  border-radius: 50px;
  font-size: 1rem;
  letter-spacing: 0.5px;
  border: none;
  transition: all var(--transition-base);
  box-shadow: 0 4px 20px rgba(255, 193, 7, 0.4);
}

.btn-hero-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(255, 193, 7, 0.5);
  color: var(--footer-dark) !important;
}

.btn-hero-secondary {
  background: transparent;
  color: #fff !important;
  font-family: var(--font-heading);
  font-weight: 600;
  padding: 14px 40px;
  border-radius: 50px;
  font-size: 1rem;
  letter-spacing: 0.5px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  transition: all var(--transition-base);
}

.btn-hero-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.6);
  transform: translateY(-3px);
  color: #fff !important;
}

/* Countdown Timer */
.countdown-wrapper {
  margin-bottom: 50px;
  animation: fadeInUp 0.8s ease 0.7s both;
}

.countdown-label {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.85rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 16px;
}

.countdown {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.countdown-item {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  min-width: 90px;
  text-align: center;
  transition: transform var(--transition-base);
}

.countdown-item:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.15);
}

.countdown-number {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
  display: block;
}

.countdown-unit {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.6);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-top: 4px;
}

/* Hero Statistics */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
  padding-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  animation: fadeInUp 0.8s ease 0.8s both;
}

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

.hero-stat-number {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}

.hero-stat-number span {
  color: var(--accent);
}

.hero-stat-label {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.6);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-top: 6px;
}

/* ============================================================
   6. SECTION SHARED STYLES
   ============================================================ */
.section-padding {
  padding: var(--section-py) 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(13, 71, 161, 0.08);
  border: 1px solid rgba(13, 71, 161, 0.15);
  border-radius: 50px;
  padding: 6px 18px;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 16px;
}


.section-title {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 16px;
  position: relative;
}

.section-title .text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto;
}

.section-divider {
  width: 60px;
  height: 4px;
  background: var(--gradient-accent);
  border-radius: 2px;
  margin: 16px auto 0;
}

.bg-light-alt {
  background-color: var(--bg-light);
}

/* ============================================================
   7. QUICK ACCESS SECTION
   ============================================================ */
#quick-access {
  background: var(--bg-white);
  position: relative;
  z-index: 5;
  margin-top: -60px;
}

.quick-access-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  text-align: center;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.quick-access-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.quick-access-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

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

.quick-access-icon {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: #fff;
  margin: 0 auto 20px;
  background: var(--gradient-primary);
  box-shadow: 0 4px 15px rgba(13, 71, 161, 0.3);
  transition: transform var(--transition-spring);
}

.quick-access-card:hover .quick-access-icon {
  transform: scale(1.1) rotate(5deg);
}

.quick-access-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.quick-access-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.btn-quick-access {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--primary);
  padding: 8px 20px;
  border-radius: 50px;
  border: 2px solid var(--primary);
  transition: all var(--transition-base);
}

.btn-quick-access:hover {
  background: var(--primary);
  color: #fff;
}

/* ============================================================
   8. ABOUT SECTION
   ============================================================ */
#about {
  background: var(--bg-light);
}

.about-image-wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about-image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.about-image-wrapper:hover img {
  transform: scale(1.05);
}

.about-image-badge {
  position: absolute;
  bottom: 20px;
  left: 20px;
  background: var(--gradient-accent);
  color: var(--footer-dark);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  box-shadow: var(--shadow-md);
}

.about-text h3 {
  font-size: 1.8rem;
  margin-bottom: 20px;
}

.about-text p {
  margin-bottom: 1px;
  font-size: 1rem;
  line-height: 1.8;
  text-align: justify;
}

.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 30px;
}

.about-feature {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-white);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  transition: all var(--transition-base);
}

.about-feature:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
  transform: translateX(4px);
}

.about-feature i {
  color: var(--primary);
  font-size: 1.2rem;
  flex-shrink: 0;
}

.about-feature span {
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-dark);
}

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

.about-stat-item {
  text-align: center;
  padding: 24px 16px;
  background: var(--bg-white);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  transition: all var(--transition-base);
}

.about-stat-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.about-stat-item i {
  font-size: 1.6rem;
  color: var(--primary);
  margin-bottom: 12px;
}

.about-stat-number {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-dark);
  line-height: 1;
  margin-bottom: 4px;
}

.about-stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ============================================================
   8B. COMMITTEE SECTION
   ============================================================ */
#committee {
  background: var(--bg-light);
}

.committee-block {
  margin-bottom: 48px;
}

/* Block header bar */
.committee-block-header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 28px;
}

.committee-block-header.advisory {
  background: linear-gradient(135deg, #0D47A1 0%, #1565C0 100%);
  color: #fff;
}

.committee-block-header.steering {
  background: linear-gradient(135deg, #0891b2 0%, #06b6d4 100%);
  color: #fff;
}

.committee-block-header.scientific {
  background: linear-gradient(135deg, #059669 0%, #10b981 100%);
  color: #fff;
}

.committee-block-icon {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.committee-block-header h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin: 0;
  letter-spacing: 0.3px;
}

/* Advisory photo area */
.committee-block .row {
  padding: 24px 0;
}

/* Member list (Steering — horizontal row) */
.committee-members-list {
  padding: 20px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Member grid (Scientific — multi-column) */
.committee-members-grid {
  padding: 20px 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}

/* Individual member card */
.committee-member-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  transition: all var(--transition-base);
}

.committee-member-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
  background: var(--bg-white);
}

.steering-member {
  background: rgba(8, 145, 178, 0.04);
  border-color: rgba(8, 145, 178, 0.2);
}

.steering-member:hover {
  border-color: #0891b2;
}

/* Avatar circle */
.cmember-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: #fff;
  flex-shrink: 0;
  box-shadow: 0 3px 10px rgba(0,0,0,0.15);
}

/* Member info */
.cmember-info {
  flex: 1;
  min-width: 0;
}

.cmember-name {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.3;
  margin-bottom: 2px;
}

.cmember-affil {
  font-size: 0.76rem;
  color: var(--text-muted);
  line-height: 1.3;
  margin-bottom: 6px;
}

/* Scopus link badge */
.scopus-badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--primary);
  background: rgba(13, 71, 161, 0.08);
  border: 1px solid rgba(13, 71, 161, 0.2);
  border-radius: 50px;
  padding: 2px 10px;
  text-decoration: none;
  transition: all var(--transition-base);
}

.scopus-badge:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ============================================================
   9. SPEAKERS SECTION
   ============================================================ */
#speakers {
  background: var(--bg-white);
}

.speaker-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 20px 16px;

  width: 100%;
  height: 100%;
  min-height: 300px;

  display: flex;
  flex-direction: column;
  align-items: center;

  text-align: center;
  position: relative;
  overflow: hidden;

  transition: all var(--transition-base);
}

.speaker-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.speaker-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

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

.speaker-photo-wrapper {
  width: 220px;
  height: 220px;
  margin: 0 auto 35px;
  position: relative;
}

.speaker-photo {
  width: 300px;
  height: 250px;

  object-fit: cover;

  border-radius: 16px;

  border: 2px solid transparent;
  background-origin: border-box;
  background-clip: content-box, border-box;
  transition: all var(--transition-base);
}

.speaker-card:hover .speaker-photo {
  transform: scale(1);
}

.speaker-country-badge {
  position: absolute;
  bottom: 0px;
  right: 5px;
  background: var(--bg-white);
  border: 2px solid var(--border-light);
  border-radius: 50px;
  padding: 3px 10px;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-dark);
  box-shadow: var(--shadow-sm);
}

.speaker-name {
  font-size: 1.1rem;
  font-weight: 900;

  min-height: 48px;
  width: 100%;

  display: flex;
  align-items: center;
  justify-content: center;

  text-align: center;
  margin-bottom: 0;
}

.speaker-institution {
  font-size: 0.9rem;
  color: var(--text-muted);

  min-height: 35px;
  width: 100%;

  display: flex;
  align-items: center;
  justify-content: center;

  text-align: center;
  margin-bottom: 0;
}

.speaker-country {
  font-size: 0.8rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 0;
}

.speaker-type-badge {
  padding: 4px 16px;
  border-radius: 50px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 15px;
}

.badge-keynote {
  background: rgba(255, 193, 7, 0.15);
  color: var(--accent-dark);
  border: 1px solid rgba(255, 193, 7, 0.3);
}

.badge-invited {
  background: rgba(13, 71, 161, 0.1);
  color: var(--primary);
  border: 1px solid rgba(13, 71, 161, 0.2);
}


/* ============================================================
   10. TOPICS SECTION (10 Cards)
   ============================================================ */
#topics {
  background: var(--bg-light);
}

.topic-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  height: 100%;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}

.topic-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.topic-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

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

.topic-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: #fff;
  margin: 0 auto 20px;
  background: var(--gradient-primary);
  box-shadow: 0 4px 15px rgba(13, 71, 161, 0.3);
  transition: transform var(--transition-spring);
}

.topic-card:hover .topic-icon {
  transform: scale(1.1) rotate(5deg);
}

/* Topic icon color variants */
.topic-icon.ai {
  background: linear-gradient(135deg, #0D47A1, #1976D2);
}

.topic-icon.ml {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
}

.topic-icon.ds {
  background: linear-gradient(135deg, #059669, #10b981);
}

.topic-icon.iot {
  background: linear-gradient(135deg, #f59e0b, #d97706);
}

.topic-icon.cs {
  background: linear-gradient(135deg, #ef4444, #dc2626);
}

.topic-icon.cc {
  background: linear-gradient(135deg, #0ea5e9, #0284c7);
}

.topic-icon.cv {
  background: linear-gradient(135deg, #8b5cf6, #7c3aed);
}

.topic-icon.nlp {
  background: linear-gradient(135deg, #ec4899, #db2777);
}

.topic-icon.robotics {
  background: linear-gradient(135deg, #14b8a6, #0d9488);
}

.topic-icon.smart {
  background: linear-gradient(135deg, #f97316, #ea580c);
}

.topic-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.topic-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0;
}

.topic-subtopics {
  text-align: left;
  list-style: none;
  padding: 0;
  margin: 20px 0 0 0;
}

.topic-subtopics li {
  font-size: 0.85rem;
  color: var(--text-body);
  margin-bottom: 12px;
  display: flex;
  align-items: flex-start;
  line-height: 1.5;
}

.topic-subtopics li i {
  flex-shrink: 0;
}

/* ============================================================
   11. COMMITTEE SECTION
   ============================================================ */
.committee-category {
  margin-bottom: 40px;
}

.committee-category-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: 10px;
}

.committee-category-title i {
  color: var(--primary);
}

.committee-member {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: all var(--transition-base);
}

.committee-member:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
  transform: translateX(4px);
}

.committee-member-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(13, 71, 161, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.committee-member-icon i {
  color: var(--primary);
  font-size: 1.1rem;
}

.committee-member-info h5 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.committee-member-info p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0;
}

.committee-member-info .scopus-id {
  font-size: 0.78rem;
  color: var(--secondary);
  font-weight: 500;
}

/* ============================================================
   12. IMPORTANT DATES (Horizontal Cards)
   ============================================================ */
#dates {
  background: var(--bg-white);
}

.dates-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0;
}

.date-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 22px 18px 18px;
  width: 160px;
  flex-shrink: 0;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.date-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.date-card-highlight {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(255,193,7,0.05) 0%, var(--bg-white) 100%);
  box-shadow: 0 4px 20px rgba(255,193,7,0.15);
}

.date-card-highlight:hover {
  border-color: var(--accent-dark);
  box-shadow: 0 8px 30px rgba(255,193,7,0.25);
}

.date-card-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: #fff;
  margin-bottom: 12px;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.date-card-label {
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 5px;
}

.date-card-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.3;
  margin-bottom: 4px;
}

.date-card-sub {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 500;
}

.date-card-highlight .date-card-sub {
  color: var(--accent-dark);
  font-weight: 700;
}

.date-card-arrow {
  font-size: 0.9rem;
  color: var(--border-light);
  padding: 0 6px;
  flex-shrink: 0;
}

/* ============================================================
   13. REGISTRATION / PRICING
   ============================================================ */
#registration {
  background: var(--bg-light);
}

.pricing-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-align: center;
  transition: all var(--transition-base);
  height: 100%;
  position: relative;
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
}

.pricing-card.featured::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-accent);
}

.pricing-header {
  padding: 28px 24px 20px;
  background: var(--gradient-card);
}

.pricing-type {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 4px;
}

.pricing-badge {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 50px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  background: rgba(13, 71, 161, 0.1);
  color: var(--primary);
}

.pricing-body {
  padding: 24px;
}

.pricing-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-light);
}

.pricing-row:last-child {
  border-bottom: none;
}

.pricing-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.pricing-label i {
  color: var(--primary);
}

.pricing-value {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-dark);
}

.pricing-value.free {
  color: #10b981;
  font-weight: 800;
}

.pricing-footer {
  padding: 0 24px 24px;
}

.btn-pricing {
  display: block;
  width: 100%;
  padding: 12px;
  border-radius: 50px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9rem;
  border: 2px solid var(--primary);
  color: var(--primary);
  background: transparent;
  transition: all var(--transition-base);
}

.btn-pricing:hover {
  background: var(--primary);
  color: #fff;
}

.pricing-card.featured .btn-pricing {
  background: var(--gradient-primary);
  color: #fff;
  border: none;
}

/* Payment card */
.payment-card {
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  padding: 40px;
  color: #fff;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.payment-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
}

.payment-card h4 {
  color: #fff;
  margin-bottom: 20px;
}

.payment-details {
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-md);
  padding: 24px;
  display: inline-block;
  position: relative;
}

.payment-details p {
  margin-bottom: 8px;
  font-size: 0.95rem;
}

.payment-details .account-number {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: 3px;
}

/* Additional fees card */
.additional-fees {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.additional-fees h5 {
  margin-bottom: 16px;
}

.fee-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-light);
}

.fee-item:last-child {
  border-bottom: none;
}

/* ============================================================
   14. PUBLICATIONS
   ============================================================ */
#publications {
  background: var(--bg-white);
}

/* Compact journal pill row */
.pub-journals-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  margin-bottom: 40px;
}

.pub-journal-pill {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: 50px;
  padding: 8px 20px 8px 8px;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.pub-journal-pill:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.pub-journal-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: #fff;
  flex-shrink: 0;
}

.pub-journal-info {
  display: flex;
  align-items: center;
  gap: 8px;
}

.pub-journal-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-dark);
  white-space: nowrap;
}

.publication-index {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 50px;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  white-space: nowrap;
}

.index-sinta2 {
  background: rgba(16, 185, 129, 0.1);
  color: #059669;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.index-sinta3 {
  background: rgba(99, 102, 241, 0.1);
  color: #6366f1;
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.index-sinta4 {
  background: rgba(249, 178, 51, 0.1);
  color: var(--accent-dark);
  border: 1px solid rgba(249, 178, 51, 0.2);
}

.index-proceeding {
  background: rgba(13, 71, 161, 0.1);
  color: var(--primary);
  border: 1px solid rgba(13, 71, 161, 0.2);
}

.index-scopus {
  background: rgba(239, 68, 68, 0.1);
  color: #dc2626;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Publication Process Flow */
.pub-process {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 50px;
}

.pub-step {
  text-align: center;
  max-width: 150px;
  flex: 1;
}

.pub-step-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: #fff;
  margin: 0 auto 12px;
  background: var(--gradient-primary);
  box-shadow: 0 4px 15px rgba(13, 71, 161, 0.3);
}

.pub-step-number {
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 4px;
}

.pub-step h5 {
  font-size: 0.85rem;
  font-weight: 600;
}

.pub-arrow {
  display: flex;
  align-items: center;
  font-size: 1.4rem;
  color: var(--primary);
  margin-top: 20px;
}

/* ============================================================
   15. GUIDELINES / DOWNLOAD SECTION
   ============================================================ */
.download-card {
  background: var(--gradient-primary);
  border-radius: var(--radius-xl);
  padding: 50px 40px;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.download-card::before {
  content: '';
  position: absolute;
  top: -30%;
  left: -30%;
  width: 160%;
  height: 160%;
  background: radial-gradient(circle at 30% 40%, rgba(255, 255, 255, 0.1), transparent 60%);
}

.download-card h3 {
  color: #fff;
  margin-bottom: 12px;
  position: relative;
}

.download-card p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 30px;
  position: relative;
}

.btn-download {
  background: #fff;
  color: var(--primary) !important;
  font-family: var(--font-heading);
  font-weight: 700;
  padding: 16px 40px;
  border-radius: 50px;
  font-size: 1rem;
  border: none;
  transition: all var(--transition-base);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.btn-download:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
  color: var(--primary) !important;
}

.download-meta {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 20px;
  position: relative;
}

.download-meta span {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.6);
  display: flex;
  align-items: center;
  gap: 6px;
}


/* Google Maps */
.map-wrapper {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
  margin-top: 30px;
}

.map-wrapper iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

.organized-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:32px;
  align-items:center;
}

.organized-card{
  background:#fff;
  border-radius:20px;
  padding:32px 24px;
  text-align:center;
  box-shadow:0 10px 30px rgba(0,0,0,0.08);
  transition:0.35s ease;
  border:1px solid #e5e7eb;
}

.organized-card:hover{
  transform:translateY(-8px);
  box-shadow:0 18px 40px rgba(0,0,0,0.12);
}

.organized-card img{
  width:140px;
  height:140px;
  object-fit:contain;
  margin-bottom:20px;
}

.organized-card h4{
  font-size:1rem;
  font-weight:700;
  color:#334155;
  line-height:1.5;
}


.organized-logos{
  display:flex;
  justify-content:center;
  align-items:center;
  flex-wrap:wrap;
  gap:50px;
}

.logo-item{
  transition:0.3s ease;
}

.logo-item:hover{
  transform:scale(1.08);
}

.logo-item img{
  width:160px;
  height:160px;
  object-fit:contain;
}

/* ============================================================
   19. CONTACT SECTION
   ============================================================ */
#contact {
  background: var(--bg-white);
}

.contact-info-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
  height: 100%;
}

.contact-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  align-items: flex-start;
}

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

.contact-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(13, 71, 161, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-icon i {
  color: var(--primary);
  font-size: 1.2rem;
}

.contact-details h5 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.contact-details p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin: 0;
}

.contact-details a {
  color: var(--primary);
  font-weight: 500;
}

.btn-whatsapp {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #25D366;
  color: #fff !important;
  padding: 10px 20px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.85rem;
  transition: all var(--transition-base);
  margin-top: 8px;
  margin-right: 8px;
}

.btn-whatsapp:hover {
  background: #128C7E;
  transform: translateY(-2px);
  color: #fff !important;
}

/* Contact Form */
.contact-form-wrapper {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px;
}

.form-floating>.form-control {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  transition: all var(--transition-base);
}

.form-floating>.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(13, 71, 161, 0.1);
}


.btn-submit {
  background: var(--gradient-primary);
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 600;
  padding: 14px 40px;
  border-radius: 50px;
  border: none;
  font-size: 1rem;
  transition: all var(--transition-base);
  box-shadow: 0 4px 15px rgba(13, 71, 161, 0.3);
}

.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(13, 71, 161, 0.4);
  color: #fff;
}

/* ============================================================
   20. FOOTER
   ============================================================ */
footer {
  background: var(--footer-dark);
  color: rgba(255, 255, 255, 0.7);
  padding-top: 60px;
}

.footer-brand h4 {
  color: #fff;
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.7;
}

.footer-title {
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 12px;
}

.footer-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 3px;
  background: var(--gradient-accent);
  border-radius: 2px;
}

.footer-links {
  list-style: none;
  padding: 0;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.88rem;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-links a:hover {
  color: var(--accent);
  transform: translateX(4px);
}

.footer-social {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.7);
  font-size: 1rem;
  transition: all var(--transition-base);
}

.footer-social a:hover {
  background: var(--gradient-accent);
  color: var(--footer-dark);
  transform: translateY(-3px);
}

/* Sponsors */
.sponsors-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 30px;
  padding: 30px 0;
  margin-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.sponsors-bar img {
  height: 40px;
  width: auto;
  opacity: 0.5;
  filter: grayscale(100%) brightness(2);
  transition: all var(--transition-base);
}

.sponsors-bar img:hover {
  opacity: 1;
  filter: none;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 0;
  margin-top: 40px;
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
}

/* ============================================================
   21. BACK TO TOP BUTTON
   ============================================================ */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  border: none;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  box-shadow: 0 4px 15px rgba(13, 71, 161, 0.3);
  z-index: 1000;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(13, 71, 161, 0.4);
}

/* ============================================================
   22. ANIMATIONS
   ============================================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

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

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

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

@keyframes pulse {

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

  50% {
    transform: scale(1.05);
  }
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }

  100% {
    background-position: 200% 0;
  }
}

/* Placeholder / Skeleton for images */
.img-placeholder {
  background: linear-gradient(90deg, var(--bg-alt) 25%, var(--bg-light) 50%, var(--bg-alt) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

/* ============================================================
   23. RESPONSIVE DESIGN
   ============================================================ */
@media (max-width: 1200px) {
  .hero-title {
    font-size: 2.4rem;
  }

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

@media (max-width: 992px) {
  :root {
    --section-py: 70px;
  }

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

  .hero-content {
    padding: 120px 0 60px;
  }

  .hero-stats {
    gap: 24px;
  }

  .hero-stat-number {
    font-size: 2rem;
  }

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

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

  .dates-row {
    gap: 8px;
  }

  .date-card {
    width: 140px;
    padding: 16px 12px 14px;
  }

  .date-card-arrow {
    display: none;
  }

  .navbar-nav {
    padding: 16px 0;
    max-height: 70vh;
    overflow-y: auto;
  }

  .pub-arrow {
    display: none;
  }

  .pub-process {
    flex-direction: column;
    align-items: center;
  }

  .pub-step {
    max-width: 200px;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 1.6rem;
  }

  .hero-theme {
    font-size: 0.9rem;
  }

  .hero-info {
    gap: 16px;
  }

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

  .btn-hero-primary,
  .btn-hero-secondary {
    width: 100%;
    max-width: 300px;
    text-align: center;
  }

  .countdown {
    gap: 10px;
  }

  .countdown-item {
    min-width: 70px;
    padding: 12px 14px;
  }

  .countdown-number {
    font-size: 1.6rem;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .section-padding {
    padding: var(--section-py-sm) 0;
  }

  .section-header {
    margin-bottom: 40px;
  }

  .hero-stats {
    gap: 16px;
  }

  .hero-stat-number {
    font-size: 1.6rem;
  }

  .download-card {
    padding: 36px 24px;
  }

  .payment-card {
    padding: 30px 20px;
  }

  .payment-details .account-number {
    font-size: 1.4rem;
  }

  .about-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  #quick-access {
    margin-top: -40px;
  }

  .gallery-swiper .swiper-slide img {
    height: 220px;
  }
}

@media (max-width: 576px) {
  .hero-title {
    font-size: 1.35rem;
  }

  .conference-badge {
    font-size: 0.75rem;
    padding: 6px 16px;
  }

  .countdown-item {
    min-width: 60px;
    padding: 10px 10px;
  }

  .countdown-number {
    font-size: 1.3rem;
  }

  .countdown-unit {
    font-size: 0.65rem;
  }

  .hero-stat {
    flex: 0 0 45%;
  }

  .venue-swiper .swiper-slide img {
    height: 220px;
  }

  #quick-access {
    margin-top: -30px;
  }

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

/* ============================================================
   24. UTILITY CLASSES
   ============================================================ */
.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-text-accent {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Lightbox override */
.glightbox-clean .gslide-title {
  font-family: var(--font-heading);
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--primary-light);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* Focus styles for accessibility */
*:focus-visible {
  outline: 3px solid var(--secondary);
  outline-offset: 2px;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary);
  color: #fff;
  padding: 8px 16px;
  z-index: 10000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

/* Publication placeholder icon */
.pub-placeholder-icon {
  width: 100px;
  height: 100px;
  margin: 0 auto 16px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: #fff;
  background: var(--gradient-primary);
}

/* Speaker placeholder */
.speaker-photo-placeholder {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: #fff;
  background: var(--gradient-primary);
  box-shadow: 0 4px 20px rgba(13, 71, 161, 0.2);
  border: 4px solid rgba(25, 118, 210, 0.3);
}

/* Research card styles (kept for backward compatibility) */
.research-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  height: 100%;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}

.research-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.research-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

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

.research-card-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: #fff;
  margin-bottom: 20px;
  background: var(--gradient-primary);
  box-shadow: 0 4px 15px rgba(13, 71, 161, 0.3);
  transition: transform var(--transition-spring);
}

.research-card:hover .research-card-icon {
  transform: scale(1.1) rotate(5deg);
}

.research-card-icon.track-2 {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.research-card-icon.track-3 {
  background: linear-gradient(135deg, #f43f5e, #ec4899);
  box-shadow: 0 4px 15px rgba(244, 63, 94, 0.3);
}

.research-card-icon.track-4 {
  background: linear-gradient(135deg, #10b981, #059669);
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.research-card-icon.track-5 {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}

.research-card h4 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.research-card .track-number {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.research-subtopics {
  list-style: none;
  padding: 0;
}

.research-subtopics li {
  padding: 6px 0;
  font-size: 0.88rem;
  color: var(--text-muted);
  display: flex;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.5;
}

.research-subtopics li i {
  color: var(--secondary);
  font-size: 0.6rem;
  margin-top: 6px;
  flex-shrink: 0;
}