/* =============================================
   GTC26 Navigation Component Styles
   Optimized with CSS Variables, Nesting & Modern CSS
   ============================================= */

/* =============================================
   CSS Custom Properties
   ============================================= */
:root {
  /* Breakpoint max-widths */
  --max-width-desktop: 1290px;
  --max-width-tablet: 954px;
  --max-width-phone: 610px;
  
  /* Spacing */
  --side-padding: 15px;
  --nav-info-height: 44px;
  --nav-main-height: 60px;
  --nav-total-height: 104px;
  --logo-width: 190px;
  --logo-height: 104px;
  --logo-aspect-ratio: 3.357;
  
  /* Gaps */
  --gap-xs: 6px;
  --gap-sm: 16px;
  --gap-md: 20px;
  --gap-lg: 30px;
  
  /* Icon sizes */
  --icon-size-sm: 24px;
  --icon-size-md: 32px;
  
  /* Colors - NVIDIA Brand */
  --color-black: #000;
  --color-gray-900: #1a1a1a;
  --color-gray-800: #333;
  --color-gray-600: #666;
  --color-gray-400: #999;
  --color-gray-100: #e0e0e0;
  --color-white: #fff;
  --color-brand-green: #76b900;
  --color-brand-green-hover: #8ed100;
  
  /* Typography */
  --font-family: 'NVIDIA Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-weight-normal: 400;
  --font-weight-bold: 700;
  
  /* Border radius */
  --radius-sm: 4px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  
  /* Z-index layers */
  --z-nav: 1000;
  --z-dropdown: 1001;
  --z-mobile-menu: 1002;
}

/* =============================================
   Reset & Base Styles
   ============================================= */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--color-gray-100);
  background-color: var(--color-black);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* =============================================
   Utility Classes
   ============================================= */
.btn-reset {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

/* Visually hidden but accessible to screen readers */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* =============================================
   Skip Link for Accessibility
   ============================================= */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-brand-green);
  color: var(--color-black);
  padding: 12px 24px;
  text-decoration: none;
  font-weight: var(--font-weight-bold);
  z-index: 9999;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  transition: top var(--transition-fast);

  &:focus {
    top: 0;
  }
}

/* =============================================
   Navigation - Main Container
   ============================================= */
.navigation {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: var(--color-black);
  z-index: var(--z-nav);
  overflow: visible;
  display: grid;
  grid-template-columns: var(--logo-width) minmax(0, 1fr);
  grid-template-rows: var(--nav-info-height) var(--nav-main-height);
  max-width: calc(var(--max-width-desktop) + (2 * var(--side-padding)));
  width: 100%;
  margin-inline: auto;
  padding-inline: var(--side-padding);

  /* Collapsed State */
  &.collapsed {
    grid-template-rows: 0 var(--nav-main-height);
    
    .nav-divider {
      opacity: 0;
    }

    .nav-info-bar {
      height: 0;
      opacity: 0;
      padding-block: 0;
      overflow: hidden;
    }

    .nav-logo {
      height: var(--nav-main-height);
      width: calc(30px * var(--logo-aspect-ratio));
      margin-left: 0;
    }

    .logo-img {
      max-height: 30px;
    }

    .nav-main {
      padding-inline: 24px 0;
    }
  }
}

/* Navigation Wrapper - Contains logo and main nav */
.nav-wrapper {
  display: contents;
}

/* Navigation Container - Max Width Constraint */
.nav-container {
  display: contents;
}

/* =============================================
   Logo Container
   ============================================= */
.nav-logo {
  grid-column: 1;
  grid-row: 1 / 3;
  width: var(--logo-width);
  height: var(--logo-height);
  background-color: var(--color-black);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: calc(var(--z-nav) + 2);
  transition: height var(--transition-normal), width var(--transition-normal), margin-left var(--transition-normal);
  overflow: hidden;
  margin-left: -24px;

  a {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
  }
}

.logo-img {
  height: auto;
  width: auto;
  max-height: 42px;
  max-width: 141px;
  transition: max-height var(--transition-normal);
}

/* Navigation Content - Fills remaining space */
.nav-content {
  grid-column: 2;
  grid-row: 2;
  min-width: 0;
}

/* =============================================
   Full-width Divider Line (passes under logo)
   ============================================= */
.nav-divider {
  grid-column: 1 / -1;
  grid-row: 1 / 2;
  align-self: end;
  height: 1px;
  background-color: var(--color-gray-800);
  z-index: calc(var(--z-nav) + 1);
  transition: opacity var(--transition-normal);
  /* Break out of container to span full viewport width */
  width: 100vw;
  position: relative;
  left: 50%;
  transform: translateX(-50%);
  margin-inline: 0;
}

/* =============================================
   Top Row - Info Bar
   ============================================= */
.nav-info-bar {
  grid-column: 2;
  grid-row: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-info-height);
  background-color: var(--color-black);
  /* GPU-accelerated transitions for smooth show/hide */
  transition: 
    opacity 0.25s cubic-bezier(0.4, 0, 0.2, 1),
    transform 0.25s cubic-bezier(0.4, 0, 0.2, 1),
    height var(--transition-normal),
    padding var(--transition-normal);
  will-change: transform, opacity;
  transform: translateY(0);
  overflow: hidden;
}

/* Info bar hidden state - scroll direction based */
.navigation.info-hidden .nav-info-bar {
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
}

/* Adjust divider when info bar is hidden */
.navigation.info-hidden .nav-divider {
  opacity: 0;
}

.nav-info-content {
  flex: 1;
  display: flex;
  align-items: center;
}

.event-details {
  font-size: var(--font-size-sm);
  color: var(--color-gray-100);
  line-height: 1;
  font-weight: var(--font-weight-normal);

  strong {
    font-weight: var(--font-weight-bold);
  }

  .divider {
    margin-inline: 2px;
    opacity: 0.6;
  }
}

/* =============================================
   Icons (shared styles)
   ============================================= */
.nav-icon,
.menu-icon,
.region-icon,
.account-icon {
  width: var(--icon-size-sm);
  height: var(--icon-size-sm);
  display: block;
}

/* =============================================
   Info Bar Actions (Region & Account Selectors)
   ============================================= */
.nav-info-actions {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  flex-shrink: 0;
}

.region-selector,
.account-selector {
  display: flex;
  align-items: center;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  transition: opacity var(--transition-fast);

  &:hover,
  &:focus {
    opacity: 0.8;
  }
}

.region-selector {
  width: 36px;
}

.region-icon-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--icon-size-sm);
  height: var(--icon-size-sm);
}

.region-lang-badge {
  position: absolute;
  top: 50%;
  left: 50%;
  font-size: 12px;
  font-family: var(--font-family);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-400);
  background-color: var(--color-black);
  padding: 2px;
  line-height: 15px;
}

/* =============================================
   Bottom Row - Main Navigation
   ============================================= */
.nav-main {
  display: flex;
  align-items: center;
  height: var(--nav-main-height);
  background-color: var(--color-black);
  transition: padding var(--transition-normal);
  width: 100%;
}

.nav-main-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: var(--gap-lg);
  min-width: 0;
}

/* Navigation Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--gap-md);
  list-style: none;
  flex: 1 1 auto;
  min-width: 0;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--gap-xs);
  color: #999999;
  text-decoration: none;
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  line-height: 30px;
  text-transform: capitalize;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  white-space: nowrap;
  transition: color var(--transition-fast);

  &:hover,
  &:focus {
    color: var(--color-gray-100);
  }
}

/* Dropdown Icon (chevron) */
.dropdown-icon {
  display: inline-block;
  width: 0;
  height: 0;
  border-inline: 4px solid transparent;
  border-block-start: 5px solid currentColor;
  transition: transform var(--transition-fast);
}

.dropdown-toggle[aria-expanded="true"] .dropdown-icon {
  transform: rotate(180deg);
}

/* Dropdown Menus */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background-color: var(--color-gray-900);
  border: 1px solid var(--color-gray-800);
  list-style: none;
  padding-block: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  z-index: var(--z-dropdown);
}

.nav-item.has-dropdown:hover .dropdown-menu,
.nav-item.has-dropdown:focus-within .dropdown-menu,
.dropdown-toggle[aria-expanded="true"] + .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-link {
  display: block;
  padding: 10px var(--gap-sm);
  color: var(--color-gray-400);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);

  &:hover,
  &:focus {
    background-color: var(--color-gray-800);
    color: var(--color-gray-100);
  }
}

/* =============================================
   CTA Button
   ============================================= */
.nav-cta {
  flex-shrink: 0;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-brand-green);
  color: var(--color-black);
  text-decoration: none;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  padding: 12px 14px;
  line-height: 1.25;
  white-space: nowrap;
  transition: background-color var(--transition-fast);

  &:hover,
  &:focus {
    background-color: var(--color-brand-green-hover);
  }
}

.cta-divider {
  font-weight: var(--font-weight-bold);
}

/* =============================================
   Mobile Navigation Controls
   ============================================= */
.nav-mobile-controls {
  display: none;
  align-items: center;
  gap: var(--gap-sm);
}

.region-selector-mobile {
  display: none;
}

.cta-button-mobile {
  display: none;
  font-size: 12px;
  padding: 9px 10.5px;
}

.cta-button-mobile .cta-divider {
  font-size: 16px;
}

.hamburger-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: var(--icon-size-md);
  height: var(--icon-size-md);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;

  &:hover {
    opacity: 0.8;
  }

  .menu-close-icon {
    display: none;
  }

  &[aria-expanded="true"] {
    .menu-open-icon {
      display: none;
    }

    .menu-close-icon {
      display: block;
    }
  }
}

/* Show hamburger in mobile controls on tablet/phone */
.nav-mobile-controls .hamburger-btn {
  display: flex;
}

/* =============================================
   Mobile Menu Overlay
   ============================================= */
.mobile-menu-overlay {
  position: fixed;
  top: var(--nav-main-height);
  inset-inline: 0;
  bottom: 0;
  background-color: var(--color-black);
  z-index: var(--z-mobile-menu);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-20px);
  transition: opacity var(--transition-normal), transform var(--transition-normal), visibility var(--transition-normal);
  overflow-y: auto;

  &[aria-hidden="false"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
}

.mobile-menu-container {
  max-width: var(--max-width-tablet);
  margin-inline: auto;
  padding: var(--gap-md) var(--side-padding);
}

.mobile-nav-links {
  list-style: none;
}

.mobile-nav-item {
  border-bottom: 1px solid var(--color-gray-800);
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding-block: var(--gap-sm);
  color: var(--color-gray-100);
  text-decoration: none;
  font-size: var(--font-size-lg);
  font-family: var(--font-family);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
}

.mobile-dropdown-icon {
  display: inline-block;
  width: 0;
  height: 0;
  border-inline: 5px solid transparent;
  border-block-start: 6px solid currentColor;
  transition: transform var(--transition-fast);
}

.mobile-dropdown-toggle[aria-expanded="true"] .mobile-dropdown-icon {
  transform: rotate(180deg);
}

.mobile-dropdown-menu {
  list-style: none;
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

.mobile-dropdown-toggle[aria-expanded="true"] + .mobile-dropdown-menu {
  max-height: 300px;
}

.mobile-dropdown-link {
  display: block;
  padding: 12px 0 12px var(--gap-md);
  color: var(--color-gray-400);
  text-decoration: none;
  font-size: var(--font-size-base);

  &:hover,
  &:focus {
    color: var(--color-gray-100);
  }
}

.mobile-cta {
  margin-top: var(--gap-lg);
}

.mobile-cta-button {
  width: 100%;
  text-align: center;
}

/* =============================================
   Body Scroll Lock (when mobile menu is open)
   ============================================= */
body.menu-open {
  overflow: hidden;
}

/* =============================================
   Main Content Styles
   ============================================= */
.main-content {
  padding-top: var(--nav-total-height);
  min-height: 200vh;
}

.content-container {
  max-width: var(--max-width-desktop);
  margin-inline: auto;
  padding-inline: var(--side-padding);
}

/* =============================================
   GTC Hero Section
   ============================================= */
.gtc-hero {
  position: relative;
  padding-block: 100px 80px;
  text-align: center;
  border-bottom: 1px solid var(--color-gray-800);
  overflow: hidden;
  height: 550px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  /* Full bleed - break out of container */
  width: 100vw;
  margin-left: calc(-50vw + 50%);
}

/* Video Background */
.hero-video-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  overflow: hidden;

  video {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    object-fit: scale-down;
    /* Gradient mask - very smooth fade near edges */
    -webkit-mask-image: linear-gradient(
      to right,
      transparent 5%,
      rgba(0, 0, 0, 0.05) 8%,
      rgba(0, 0, 0, 0.15) 11%,
      rgba(0, 0, 0, 0.3) 14%,
      rgba(0, 0, 0, 0.5) 17%,
      rgba(0, 0, 0, 0.7) 20%,
      rgba(0, 0, 0, 0.85) 23%,
      rgba(0, 0, 0, 0.95) 26%,
      black 30%,
      black 70%,
      rgba(0, 0, 0, 0.95) 74%,
      rgba(0, 0, 0, 0.85) 77%,
      rgba(0, 0, 0, 0.7) 80%,
      rgba(0, 0, 0, 0.5) 83%,
      rgba(0, 0, 0, 0.3) 86%,
      rgba(0, 0, 0, 0.15) 89%,
      rgba(0, 0, 0, 0.05) 92%,
      transparent 95%
    );
    mask-image: linear-gradient(
      to right,
      transparent 5%,
      rgba(0, 0, 0, 0.05) 8%,
      rgba(0, 0, 0, 0.15) 11%,
      rgba(0, 0, 0, 0.3) 14%,
      rgba(0, 0, 0, 0.5) 17%,
      rgba(0, 0, 0, 0.7) 20%,
      rgba(0, 0, 0, 0.85) 23%,
      rgba(0, 0, 0, 0.95) 26%,
      black 30%,
      black 70%,
      rgba(0, 0, 0, 0.95) 74%,
      rgba(0, 0, 0, 0.85) 77%,
      rgba(0, 0, 0, 0.7) 80%,
      rgba(0, 0, 0, 0.5) 83%,
      rgba(0, 0, 0, 0.3) 86%,
      rgba(0, 0, 0, 0.15) 89%,
      rgba(0, 0, 0, 0.05) 92%,
      transparent 95%
    );
  }
}

.hero-video-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.6) 0%,
    rgba(0, 0, 0, 0.4) 50%,
    rgba(0, 0, 0, 0.7) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  margin-bottom: 40px;
}

.hero-date {
  font-size: var(--font-size-sm);
  color: var(--color-gray-100);
  margin-bottom: var(--gap-sm);
  letter-spacing: 0.5px;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

.hero-title {
  font-size: clamp(32px, 6vw, 56px);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  margin-bottom: var(--gap-md);
  line-height: 1.1;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-tagline {
  font-size: clamp(16px, 2.5vw, 20px);
  color: var(--color-gray-100);
  margin-bottom: var(--gap-lg);
  max-width: 600px;
  margin-inline: auto;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

.hero-cta {
  display: inline-block;
  background-color: var(--color-black);
  color: var(--color-white);
  text-decoration: none;
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  padding: 12px 24px;
  transition: background-color var(--transition-fast), transform var(--transition-fast);

  &:hover,
  &:focus {
    background-color: var(--color-gray-900);
    transform: translateY(-2px);
  }
}

/* Delayed fade-in animation for hero CTA */
.hero-cta-delayed {
  opacity: 0;
  animation: fadeIn 1s ease-out 6s forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* =============================================
   Dev Controls (Hidden State)
   ============================================= */
.dev-control-hidden {
  display: none !important;
}

/* =============================================
   Mask Adjustment Handles (Dev Tool)
   ============================================= */
.mask-handles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  pointer-events: none;
}

.mask-handle {
  position: absolute;
  top: 0;
  width: 4px;
  height: 100%;
  background: rgba(118, 185, 0, 0.8);
  cursor: ew-resize;
  pointer-events: auto;
  transition: background-color 0.15s ease;

  &::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 40px;
    background: var(--color-brand-green);
    border-radius: 4px;
    border: 2px solid var(--color-white);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
  }

  &:hover {
    background: rgba(118, 185, 0, 1);
  }

  &:active {
    background: rgba(142, 209, 0, 1);
  }
}

.mask-handle-left {
  left: 426px;
  top: 15px;
}

.mask-handle-right {
  right: 5%;
}

.handle-label {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-black);
  color: var(--color-white);
  font-size: 12px;
  font-weight: var(--font-weight-bold);
  padding: 4px 8px;
  border-radius: 4px;
  white-space: nowrap;
  pointer-events: none;
}

.mask-values {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.9);
  color: var(--color-white);
  font-size: 14px;
  font-family: monospace;
  padding: 10px 20px;
  border-radius: 6px;
  border: 1px solid var(--color-gray-800);
  pointer-events: none;
}

.hero-description {
  position: relative;
  z-index: 1;
  font-size: clamp(16px, 2vw, 18px);
  color: var(--color-gray-100);
  line-height: 1.7;
  max-width: 900px;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
  margin: var(--gap-md) auto 0;
  text-align: center;
}

/* =============================================
   Section Common Styles
   ============================================= */
.section-title {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  text-align: center;
  margin-bottom: 40px;
}

.section-cta {
  display: inline-block;
  background-color: transparent;
  color: var(--color-brand-green);
  text-decoration: none;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  padding: 12px 24px;
  border: 2px solid var(--color-brand-green);
  margin-top: 40px;
  transition: background-color var(--transition-fast), color var(--transition-fast);

  &:hover,
  &:focus {
    background-color: var(--color-brand-green);
    color: var(--color-black);
  }
}

/* =============================================
   Experience AI in Action Section
   ============================================= */
.experience-section {
  padding-block: 80px;
  border-bottom: 1px solid var(--color-gray-800);
}

.experience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap-lg);
}

.experience-card {
  background-color: var(--color-gray-900);
  padding: 30px;
  border: 1px solid var(--color-gray-800);
  transition: border-color var(--transition-fast), transform var(--transition-fast);

  &:hover {
    border-color: var(--color-brand-green);
    transform: translateY(-4px);
  }
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  margin-bottom: 8px;
}

.card-tagline {
  font-size: var(--font-size-sm);
  color: var(--color-brand-green);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--gap-sm);
}

.card-description {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  line-height: 1.6;
  margin-bottom: var(--gap-sm);
}

.card-link {
  display: inline-block;
  font-size: var(--font-size-sm);
  color: var(--color-brand-green);
  text-decoration: none;
  font-weight: var(--font-weight-bold);
  margin-top: auto;
  transition: color var(--transition-fast);

  &:hover,
  &:focus {
    color: var(--color-brand-green-hover);
    text-decoration: underline;
  }
}

/* =============================================
   Speakers Section
   ============================================= */
.speakers-section {
  padding-block: 80px;
  border-bottom: 1px solid var(--color-gray-800);
}

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

.speaker-card {
  text-align: center;
  padding: 20px;
  transition: transform var(--transition-fast);

  &:hover {
    transform: translateY(-4px);
  }
}

.speaker-image {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background-color: var(--color-gray-800);
  margin: 0 auto 20px;
  background-image: linear-gradient(135deg, var(--color-gray-800) 0%, var(--color-gray-600) 100%);
}

.speaker-name {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  margin-bottom: 4px;
}

.speaker-title {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  margin-bottom: 2px;
}

.speaker-company {
  font-size: var(--font-size-sm);
  color: var(--color-brand-green);
  font-weight: var(--font-weight-bold);
}

/* =============================================
   Sessions Section
   ============================================= */
.sessions-section {
  padding-block: 80px;
  border-bottom: 1px solid var(--color-gray-800);
  text-align: center;
}

.sessions-carousel {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap-md);
  margin-bottom: 20px;
}

.session-card {
  background-color: var(--color-gray-900);
  padding: 24px;
  border: 1px solid var(--color-gray-800);
  text-align: left;
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition-fast), transform var(--transition-fast);

  &:hover {
    border-color: var(--color-brand-green);
    transform: translateY(-4px);
  }
}

.session-type {
  display: inline-block;
  font-size: 12px;
  color: var(--color-brand-green);
  text-transform: uppercase;
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.session-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  margin-bottom: 12px;
  line-height: 1.3;
}

.session-description {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  line-height: 1.5;
  flex: 1;
}

/* =============================================
   Topics Section
   ============================================= */
.topics-section {
  padding-block: 80px;
  border-bottom: 1px solid var(--color-gray-800);
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap-md);
}

.topic-card {
  background-color: var(--color-gray-900);
  padding: 24px;
  border: 1px solid var(--color-gray-800);
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition-fast), transform var(--transition-fast);

  &:hover {
    border-color: var(--color-brand-green);
    transform: translateY(-4px);
  }
}

.topic-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  margin-bottom: 12px;
  line-height: 1.3;
}

.topic-description {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  line-height: 1.5;
  flex: 1;
  margin-bottom: var(--gap-sm);
}

.topic-link {
  display: inline-block;
  font-size: var(--font-size-sm);
  color: var(--color-brand-green);
  text-decoration: none;
  font-weight: var(--font-weight-bold);
  transition: color var(--transition-fast);

  &:hover,
  &:focus {
    color: var(--color-brand-green-hover);
    text-decoration: underline;
  }
}

/* =============================================
   Responsive Styles - Laptop (max-width: 1350px)
   ============================================= */
@media (max-width: 1350px) {
  .navigation {
    max-width: 100%;
  }
  
  .nav-container {
    max-width: calc(var(--max-width-tablet) + (2 * var(--side-padding)));
  }
  
  .content-container {
    max-width: var(--max-width-tablet);
  }

  .event-details {
    font-size: var(--font-size-sm);
  }

  .cta-button {
    font-size: var(--font-size-sm);
    padding: 10.5px 12.25px;
  }

  .cta-button .cta-divider {
    font-size: 16px;
  }
  
  .nav-links {
    gap: var(--gap-sm);
  }

  /* Laptop - Section adjustments */
  .experience-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .speakers-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--gap-md);
  }

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

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

/* =============================================
   Responsive Styles - Tablet (max-width: 954px)
   ============================================= */
@media (max-width: 954px) {
  :root {
    --nav-info-height: 44px;
    --nav-main-height: 60px;
    --nav-total-height: calc(var(--nav-info-height) + var(--nav-main-height));
    --logo-height: 60px;
  }
  
  .nav-divider {
    display: none;
  }
  
  /* Nav group wrapper - contains info bar and main nav as one unit */
  .navigation {
    display: flex;
    flex-direction: column;
    max-width: none;
    padding-inline: 0;
    overflow: visible;
  }
  
  .nav-info-bar {
    order: 1;
    grid-column: auto;
    grid-row: auto;
    z-index: calc(var(--z-nav) + 3);
    padding-inline: var(--side-padding);
    border-bottom: 1px solid var(--color-gray-800);
    justify-content: center;
    height: auto;
    min-height: var(--nav-info-height);
    padding-block: 8px;
    width: 100%;
    /* GPU-accelerated transitions for tablet */
    transition: 
      opacity 0.25s cubic-bezier(0.4, 0, 0.2, 1),
      transform 0.25s cubic-bezier(0.4, 0, 0.2, 1),
      max-height var(--transition-normal),
      padding var(--transition-normal),
      margin var(--transition-normal);
    will-change: transform, opacity;
    transform: translateY(0);
  }
  
  /* Info bar hidden state for tablet */
  .navigation.info-hidden .nav-info-bar {
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    max-height: 0;
    min-height: 0;
    padding-block: 0;
    border-bottom: none;
  }
  
  .nav-wrapper {
    order: 2;
    display: flex;
    justify-content: center;
    width: 100%;
  }
  
  .nav-container {
    display: flex;
    width: 100%;
    max-width: calc(var(--max-width-tablet) + (2 * var(--side-padding)));
    padding-inline: var(--side-padding);
  }
  
  .nav-content {
    grid-column: auto;
    grid-row: auto;
    flex: 1;
    min-width: 0;
  }
  
  .nav-logo {
    grid-column: auto;
    grid-row: auto;
    height: var(--logo-height);
    width: calc(30px * var(--logo-aspect-ratio));
    margin-left: 0;
  }
  
  .content-container {
    max-width: var(--max-width-tablet);
  }
  
  .logo-img {
    max-height: 30px;
  }
  
  .nav-links,
  .nav-cta-desktop {
    display: none;
  }
  
  .nav-mobile-controls {
    display: flex;
  }
  
  .cta-button-mobile,
  .region-selector-mobile {
    display: inline-flex;
  }
  
  .nav-main-content {
    justify-content: flex-end;
  }
  
  .event-details {
    font-size: 12px;
    white-space: normal;
    line-height: 1.4;
    display: block;
    word-wrap: break-word;
    overflow-wrap: break-word;
  }
  
  .account-selector,
  .nav-info-actions .region-selector {
    display: none;
  }
  
  .nav-info-content {
    flex: none;
    text-align: center;
    justify-content: center;
    width: 100%;
  }
  
  /* Tablet collapsed state */
  .navigation.collapsed {
    .nav-info-bar {
      max-height: 0;
      min-height: 0;
      padding-block: 0;
      margin: 0;
      opacity: 0;
      overflow: hidden;
      border-bottom: none;
    }

    .nav-wrapper {
      margin-top: 0;
    }
  }
  
  .mobile-menu-overlay {
    top: var(--nav-total-height);
  }
  
  /* When info bar is hidden/collapsed, adjust mobile menu position */
  .navigation.collapsed .mobile-menu-overlay,
  .navigation.info-hidden .mobile-menu-overlay {
    top: var(--nav-main-height);
  }

  .main-content {
    padding-top: var(--nav-main-height);
  }

  /* Tablet - Hero adjustments */
  .gtc-hero {
    padding-block: 60px 50px;
    height: 500px;
  }

  /* Tablet - Section adjustments */
  .experience-section,
  .speakers-section,
  .sessions-section,
  .topics-section {
    padding-block: 60px;
  }

  .experience-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--gap-md);
  }

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

  .speaker-image {
    width: 100px;
    height: 100px;
  }

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

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

/* =============================================
   Responsive Styles - Phone (max-width: 640px)
   ============================================= */
@media (max-width: 640px) {
  :root {
    --nav-info-height: 36px;
    --nav-main-height: 60px;
    --nav-total-height: calc(var(--nav-info-height) + var(--nav-main-height));
    --logo-height: 60px;
  }
  
  .nav-container,
  .content-container {
    max-width: calc(var(--max-width-phone) + (2 * var(--side-padding)));
  }
  
  .content-container {
    max-width: var(--max-width-phone);
  }
  
  .nav-logo {
    width: calc(26px * var(--logo-aspect-ratio));
  }
  
  .logo-img {
    max-height: 26px;
  }
  
  .event-details {
    font-size: 12px;

    .divider {
      margin-inline: 1px;
    }
  }
  
  .nav-info-bar {
    height: auto;
    min-height: var(--nav-info-height);
    padding: 8px var(--side-padding);
    width: 100%;
    justify-content: center;
  }
  
  .nav-info-content {
    text-align: center;
    width: 100%;
    flex: none;
  }
  
  .cta-button-mobile {
    font-size: 12px;
    padding: 9px 10.5px;
  }

  .cta-button-mobile .cta-divider {
    font-size: 16px;
  }

  .mobile-nav-link {
    font-size: var(--font-size-base);
    padding-block: 14px;
  }

  /* Phone - Hero adjustments */
  .gtc-hero {
    padding-block: 50px 40px;
    height: 450px;
  }

  .hero-title {
    font-size: clamp(28px, 8vw, 40px);
  }

  .hero-cta {
    padding: 12px 24px;
    font-size: var(--font-size-sm);
  }

  .hero-description {
    font-size: var(--font-size-sm);
  }

  /* Phone - Section adjustments */
  .section-title {
    font-size: clamp(20px, 5vw, 28px);
    margin-bottom: 30px;
  }

  .experience-section,
  .speakers-section,
  .sessions-section,
  .topics-section {
    padding-block: 40px;
  }

  .experience-grid {
    grid-template-columns: 1fr;
    gap: var(--gap-sm);
  }

  .experience-card {
    padding: 24px;
  }

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

  .speaker-card {
    padding: 16px;
  }

  .speaker-image {
    width: 80px;
    height: 80px;
    margin-bottom: 12px;
  }

  .speaker-name {
    font-size: var(--font-size-sm);
  }

  .speaker-title,
  .speaker-company {
    font-size: 12px;
  }

  .sessions-carousel {
    grid-template-columns: 1fr;
    gap: var(--gap-sm);
  }

  .session-card {
    padding: 20px;
  }

  .topics-grid {
    grid-template-columns: 1fr;
    gap: var(--gap-sm);
  }

  .topic-card {
    padding: 20px;
  }

  .section-cta {
    margin-top: 30px;
    padding: 10px 20px;
    font-size: var(--font-size-sm);
  }
}

/* =============================================
   Responsive Styles - Extra Small (max-width: 360px)
   ============================================= */
@media (max-width: 360px) {
  .nav-logo {
    width: 25.16vw;
    min-width: 80px;
  }
  
  .logo-img {
    max-height: 7.5vw;
    min-height: 24px;
  }
  
  .navigation.collapsed {
    .nav-logo {
      width: 25.16vw;
      min-width: 80px;
    }

    .logo-img {
      max-height: 7.5vw;
      min-height: 24px;
    }
  }
}