/* ==========================================================================
   ICSADET 2026 - Official Multi-Page Conference Stylesheet (Light Theme)
   National Conference on Sustainable AI, Data Analytics & Emerging Technologies
   Department of CSE (Data Science), TGPCET Nagpur
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400&family=Space+Grotesk:wght@500;600;700&display=swap');

:root {
  --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Fresh & Elevated Light Palette */
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-dark: #1e3a8a;
  --primary-light: #eff6ff;
  --primary-subtle: #dbeafe;
  --primary-glow: rgba(37, 99, 235, 0.2);

  --secondary: #0284c7;
  --secondary-light: #f0f9ff;
  --secondary-subtle: #e0f2fe;

  --accent-emerald: #059669;
  --accent-emerald-light: #ecfdf5;
  --accent-emerald-subtle: #d1fae5;

  --accent-amber: #d97706;
  --accent-amber-light: #fffbeb;
  --accent-amber-subtle: #fef3c7;

  /* Surfaces & Clean Light Backgrounds */
  --bg-body: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-alt: #f1f5f9;
  --bg-surface-muted: #e2e8f0;
  --bg-glass: rgba(255, 255, 255, 0.95);

  /* Borders & Dividers */
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;
  --border-focus: #93c5fd;

  /* High Contrast Typography */
  --text-heading: #0f172a;
  --text-body: #334155;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --text-inverse: #ffffff;

  /* Soft Shadows */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px -4px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 16px 36px -6px rgba(15, 23, 42, 0.12);
  --shadow-card-hover: 0 20px 40px -10px rgba(37, 99, 235, 0.15);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Base Styles */
* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-body);
  color: var(--text-body);
  line-height: 1.65;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6, .font-heading {
  font-family: var(--font-heading);
  color: var(--text-heading);
  font-weight: 700;
  letter-spacing: -0.02em;
}

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

/* Top Announcement Strip */
.top-notice-bar {
  background: #0f172a;
  color: #e2e8f0;
  font-size: 0.825rem;
  padding: 6px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  position: relative;
  z-index: 1040;
}

.top-notice-badge {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.725rem;
  padding: 2px 8px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* --- Clean Light Sticky Navigation Bar --- */
.navbar-conference {
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 0;
  transition: var(--transition);
  z-index: 1030;
  box-shadow: 0 2px 10px rgba(15, 23, 42, 0.04);
}

.navbar-conference.scrolled {
  padding: 8px 0;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}

.navbar-brand-img {
  height: 52px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
}

.navbar-nav .nav-link {
  font-family: var(--font-main);
  font-weight: 600;
  font-size: 0.925rem;
  color: #334155 !important;
  padding: 8px 14px !important;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  position: relative;
}

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

.navbar-nav .nav-link.active {
  color: var(--primary) !important;
  background: var(--primary-light);
  font-weight: 700;
}

.navbar-nav .nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 14px;
  right: 14px;
  height: 2.5px;
  background: var(--primary);
  border-radius: 2px;
}

/* Nav Dropdown Styling for Light Theme */
.navbar-nav .dropdown-menu {
  background: #ffffff;
  border: 1px solid var(--border-color);
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.12);
  border-radius: var(--radius-md);
  padding: 8px;
  min-width: 240px;
  margin-top: 8px;
}

.navbar-nav .dropdown-item {
  font-family: var(--font-main);
  color: #334155;
  font-weight: 500;
  font-size: 0.885rem;
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
}

.navbar-nav .dropdown-item:hover,
.navbar-nav .dropdown-item.active {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
  transform: translateX(4px);
}

@media (min-width: 1200px) {
  .navbar-nav .nav-item.dropdown:hover .dropdown-menu {
    display: block;
    animation: fadeInDown 0.2s ease forwards;
  }
}

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

/* Subpage Quick Navigation Pills */
.subpage-nav-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  background: #ffffff;
  border: 1px solid var(--border-color);
  color: var(--text-body);
  transition: var(--transition);
}

.subpage-nav-pill:hover,
.subpage-nav-pill.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 4px 12px var(--primary-glow);
}

/* Scroll progress */
.scroll-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, #2563eb, #0284c7, #059669);
  width: 0%;
  z-index: 9999;
}

/* Custom Buttons */
.btn-primary-gradient {
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  color: #ffffff !important;
  font-weight: 600;
  border: none;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}

.btn-primary-gradient:hover {
  background: linear-gradient(135deg, #1d4ed8 0%, #1e3a8a 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45);
}

.btn-secondary-glow {
  background: #ffffff;
  color: var(--text-heading);
  font-weight: 600;
  border: 1px solid var(--border-color);
  padding: 10px 22px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: var(--shadow-xs);
  transition: var(--transition);
}

.btn-secondary-glow:hover {
  background: var(--bg-surface-alt);
  color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-2px);
}

/* --- The ONE Hero Carousel (Homepage Only) --- */
.hero-conference-wrapper {
  position: relative;
  background: #0f172a;
  overflow: hidden;
}

.hero-carousel {
  position: relative;
  min-height: 580px;
}

.hero-carousel .carousel-inner,
.hero-carousel .carousel-item {
  min-height: 580px;
}

.hero-slide-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  filter: brightness(0.38) contrast(1.15);
  transform: scale(1.02);
  transition: transform 8s ease-out;
}

.carousel-item.active .hero-slide-bg {
  transform: scale(1.0);
}

.hero-overlay-gradient {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 20% 30%, rgba(37, 99, 235, 0.35) 0%, transparent 60%),
              radial-gradient(circle at 80% 70%, rgba(2, 132, 199, 0.3) 0%, transparent 60%),
              linear-gradient(180deg, rgba(15, 23, 42, 0.4) 0%, rgba(15, 23, 42, 0.9) 100%);
  pointer-events: none;
}

.hero-content-container {
  position: relative;
  z-index: 2;
  padding-top: 50px;
  padding-bottom: 60px;
}

.hero-badge-capsule {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  color: #38bdf8;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.hero-main-title {
  font-size: clamp(2rem, 3.8vw + 0.8rem, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  color: #ffffff;
  margin-top: 14px;
  margin-bottom: 12px;
}

.gradient-text-ai {
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #34d399 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub-meta {
  font-size: 1.05rem;
  color: #cbd5e1;
  max-width: 680px;
  margin-bottom: 22px;
}

.hero-pills-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 26px;
}

.hero-pill-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(6px);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  color: #e2e8f0;
  font-size: 0.85rem;
  font-weight: 500;
}

/* Real-Time Countdown Card (Light-Frosted Floating Style) */
.countdown-glass-card {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25), 0 0 25px rgba(37, 99, 235, 0.2);
  position: relative;
  overflow: hidden;
}

.countdown-glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #2563eb, #0284c7, #059669);
}

.countdown-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.countdown-box {
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 6px;
  text-align: center;
  transition: var(--transition);
}

.countdown-box:hover {
  background: var(--primary-light);
  border-color: var(--primary-subtle);
  transform: translateY(-2px);
}

.countdown-number {
  font-family: var(--font-heading);
  font-size: clamp(1.7rem, 2.6vw, 2.3rem);
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  display: block;
}

.countdown-label {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-top: 4px;
  display: block;
}

/* --- Subpage Banner Header (NO Slider on subpages) --- */
.subpage-banner {
  background: linear-gradient(135deg, #eff6ff 0%, #f0fdf4 100%);
  border-bottom: 1px solid var(--border-color);
  padding: 50px 0 45px 0;
  position: relative;
}

.subpage-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: radial-gradient(#cbd5e1 1px, transparent 1px);
  background-size: 24px 24px;
  opacity: 0.4;
  pointer-events: none;
}

.breadcrumb-custom {
  background: transparent;
  padding: 0;
  margin-bottom: 12px;
  font-size: 0.875rem;
}

.breadcrumb-custom a {
  color: var(--primary);
  font-weight: 600;
}

.breadcrumb-custom .breadcrumb-item.active {
  color: var(--text-muted);
}

.subpage-title {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 8px;
}

.subpage-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 700px;
  margin-bottom: 0;
}

/* --- Section Layouts --- */
.section-padding {
  padding: 70px 0;
}

.section-header-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--primary);
  background: var(--primary-light);
  border: 1px solid var(--primary-subtle);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
}

.section-header-title {
  font-size: clamp(1.75rem, 2.5vw, 2.25rem);
  font-weight: 800;
  margin-bottom: 12px;
}

.section-header-desc {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto;
}

/* Stat strip */
.stats-strip-light {
  background: #ffffff;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-lg);
  padding: 24px 16px;
  margin-top: -30px;
  position: relative;
  z-index: 10;
}

.stat-item {
  text-align: center;
  padding: 8px 12px;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.1;
}

.stat-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-top: 4px;
}

/* --- Content Cards --- */
.content-card-light {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-xs);
  height: 100%;
  transition: var(--transition);
}

.content-card-light:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--border-focus);
}

/* Vision Card */
.vision-card-light {
  background: linear-gradient(135deg, #eff6ff 0%, #f8fafc 100%);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 24px;
}

/* Mission list */
.mission-list {
  list-style: none;
  padding-left: 0;
  margin-bottom: 0;
}

.mission-list li {
  position: relative;
  padding-left: 32px;
  margin-bottom: 14px;
  font-size: 0.95rem;
}

.mission-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 1px;
  width: 22px;
  height: 22px;
  background: var(--accent-emerald-light);
  color: var(--accent-emerald);
  font-weight: 800;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  border: 1px solid var(--accent-emerald-subtle);
}

/* Objective Card */
.obj-card-light {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  height: 100%;
  transition: var(--transition);
}

.obj-card-light:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
  border-color: var(--primary);
}

.obj-badge-light {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 800;
  font-family: var(--font-heading);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  border: 1px solid var(--primary-subtle);
}

.outcome-badge-light {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--accent-emerald-light);
  color: var(--accent-emerald);
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--accent-emerald-subtle);
}

/* --- Technical Tracks --- */
.track-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 28px;
}

.track-filter-btn {
  background: #ffffff;
  color: var(--text-body);
  border: 1px solid var(--border-color);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.track-filter-btn:hover,
.track-filter-btn.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 4px 12px var(--primary-glow);
}

.track-card-light {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-xs);
  height: 100%;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.track-card-light::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  opacity: 0;
  transition: var(--transition);
}

.track-card-light:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--border-focus);
}

.track-card-light:hover::before {
  opacity: 1;
}

.track-tag-pill {
  display: inline-block;
  background: var(--bg-surface-alt);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  margin-right: 6px;
  margin-bottom: 6px;
  transition: var(--transition);
}

.track-tag-pill:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary-subtle);
}

/* --- Timeline on Light Theme --- */
.timeline-container {
  position: relative;
  max-width: 860px;
  margin: 0 auto;
}

.timeline-container::before {
  content: '';
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 50%;
  width: 3px;
  background: linear-gradient(180deg, var(--primary) 0%, var(--secondary) 50%, var(--accent-emerald) 100%);
  transform: translateX(-50%);
  border-radius: 2px;
}

@media (max-width: 767.98px) {
  .timeline-container::before {
    left: 20px;
  }
}

.timeline-block {
  position: relative;
  margin-bottom: 34px;
}

.timeline-dot {
  position: absolute;
  top: 18px;
  left: 50%;
  width: 22px;
  height: 22px;
  background: #ffffff;
  border: 4px solid var(--primary);
  border-radius: 50%;
  transform: translateX(-50%);
  z-index: 2;
  box-shadow: 0 0 10px var(--primary-glow);
}

@media (max-width: 767.98px) {
  .timeline-dot {
    left: 20px;
  }
}

.timeline-content-card {
  width: calc(50% - 36px);
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: var(--transition);
}

.timeline-content-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.timeline-left {
  margin-left: 0;
  text-align: right;
}

.timeline-right {
  margin-left: calc(50% + 36px);
  text-align: left;
}

@media (max-width: 767.98px) {
  .timeline-content-card {
    width: calc(100% - 50px);
    margin-left: 50px !important;
    text-align: left !important;
  }
}

/* --- Speaker Cards --- */
.speaker-card-light {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  height: 100%;
  transition: var(--transition);
  text-align: center;
}

.speaker-card-light:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--border-focus);
}

.speaker-img-wrap {
  position: relative;
  height: 270px;
  overflow: hidden;
  background: #f1f5f9;
}

.speaker-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  transition: transform 0.5s ease;
}

.speaker-card-light:hover .speaker-img {
  transform: scale(1.04);
}

.speaker-session-chip {
  position: absolute;
  top: 14px;
  right: 14px;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(8px);
  color: #38bdf8;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 5px 12px;
  border-radius: var(--radius-full);
}

.speaker-body {
  padding: 24px 20px;
}

/* Person card */
.person-card-light {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-xs);
  height: 100%;
  transition: var(--transition);
}

.person-card-light:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
  border-color: var(--primary);
}

.person-role {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--primary);
  margin-bottom: 4px;
}

.person-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 4px;
}

.person-affiliation {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Pricing Fee Card */
.fee-card-light {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow-xs);
  height: 100%;
  transition: var(--transition);
  position: relative;
}

.fee-card-light.featured {
  border: 2px solid var(--primary);
  box-shadow: 0 10px 30px var(--primary-glow);
}

.fee-card-light:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-card-hover);
}

.fee-price {
  font-family: var(--font-heading);
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
}

/* Bank Details Box */
.bank-details-box-light {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.copy-badge-btn {
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid var(--primary-subtle);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.copy-badge-btn:hover {
  background: var(--primary);
  color: #ffffff;
}

.qr-preview-box {
  background: #ffffff;
  padding: 14px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xs);
  display: inline-block;
  border: 1px solid var(--border-color);
}

.qr-img {
  width: 170px;
  height: 170px;
  object-fit: contain;
  display: block;
}

/* Contact Cards */
.contact-info-card-light {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-xs);
  height: 100%;
}

.contact-person-badge {
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 16px;
}

.contact-icon-pill {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

/* Footer (Light/Clean Slate Theme) */
.footer-conference-light {
  background: #0f172a;
  color: #94a3b8;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 55px;
  padding-bottom: 30px;
}

.footer-title {
  color: #ffffff;
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 16px;
}

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

.footer-links-list li {
  margin-bottom: 9px;
}

.footer-links-list a {
  color: #cbd5e1;
  font-size: 0.9rem;
}

.footer-links-list a:hover {
  color: #38bdf8;
  padding-left: 4px;
}

.footer-social-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  color: #cbd5e1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-right: 8px;
  transition: var(--transition);
}

.footer-social-icon:hover {
  background: var(--primary);
  color: #ffffff;
  transform: translateY(-2px);
}

/* Back to Top */
.back-to-top-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: #ffffff;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px var(--primary-glow);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 1020;
}

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

.back-to-top-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-3px);
}

/* Responsive adjustments */
@media (max-width: 991.98px) {
  .hero-carousel,
  .hero-carousel .carousel-inner,
  .hero-carousel .carousel-item {
    min-height: 520px;
  }

  .section-padding {
    padding: 50px 0;
  }
}