/* ============================================
   CaP-X Website Styles
   NVIDIA design language: sharp edges, flat,
   white/black/green, geometric typography
   ============================================ */

/* --- NVIDIA Sans Font --- */
@font-face {
  font-family: 'NVIDIA Sans';
  src: url('../font/NVIDIASansVF_NALA_W_Wght.woff2') format('woff2');
  font-weight: 100 900;
  font-display: swap;
}

/* --- CSS Custom Properties --- */
:root {
  --nvidia-green: #76b900;
  --nvidia-green-dark: #5a8f00;
  --nvidia-green-light: #8fd100;
  --nvidia-green-bg: rgba(118, 185, 0, 0.08);

  --bg-primary: #ffffff;
  --bg-secondary: #f7f7f7;
  --bg-dark: #1a1a1a;
  --bg-black: #000000;

  --text-primary: #000000;
  --text-secondary: #666666;
  --text-muted: #999999;

  --border-light: #e5e5e5;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;

  --max-width: 1200px;
  --nav-height: 56px;

  --font-sans: 'NVIDIA Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a:hover {
  color: var(--nvidia-green);
}

/* --- Navigation Bar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2.5rem;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.75) 0%,
    rgba(255, 255, 255, 0.55) 100%
  );
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid rgba(255, 255, 255, 0.5);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04);
  transition: box-shadow var(--transition-normal);
}

.navbar.scrolled {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.nav-brand {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.nav-link {
  padding: 0.45rem 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: all var(--transition-fast);
  position: relative;
  border: 1.5px solid transparent;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--nvidia-green);
  transition: width 0.3s ease;
}

.nav-link:hover {
  color: var(--text-primary);
  border-color: var(--text-primary);
  background: none;
}

.nav-link:hover::after {
  width: 100%;
}

.nav-link.highlighted {
  background: var(--nvidia-green);
  color: var(--text-primary);
  font-weight: 700;
  padding: 0.45rem 1.25rem;
}

.nav-link.highlighted::after {
  display: none;
}

.nav-link.highlighted:hover {
  background: var(--nvidia-green-dark);
  color: var(--text-primary);
}

.nav-team {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* --- Sections --- */
.section {
  padding: 3rem 2.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-full {
  padding: 3rem 2.5rem;
  width: 100%;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.7;
}

/* --- Hero Backdrop (unified aura container) --- */
.hero-backdrop {
  position: relative;
  overflow: hidden;
}

.hero-backdrop::before,
.hero-backdrop::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
}

.hero-backdrop::before {
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, #76b900 0%, #a3d940 40%, transparent 70%);
  top: -200px;
  left: -250px;
  animation: aura-drift-1 8s ease-in-out infinite alternate;
}

.hero-backdrop::after {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #a3d940 0%, #76b900 40%, transparent 70%);
  top: -100px;
  right: -200px;
  animation: aura-drift-2 10s ease-in-out infinite alternate;
}

@keyframes aura-drift-1 {
  0% { transform: translate(0, 0) scale(1); opacity: 0.2; }
  50% { transform: translate(60px, 50px) scale(1.1); opacity: 0.3; }
  100% { transform: translate(-20px, 30px) scale(0.95); opacity: 0.2; }
}

@keyframes aura-drift-2 {
  0% { transform: translate(0, 0) scale(1); opacity: 0.15; }
  50% { transform: translate(-50px, 40px) scale(1.15); opacity: 0.25; }
  100% { transform: translate(20px, 20px) scale(0.9); opacity: 0.15; }
}

/* --- Hero Section --- */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding-top: calc(var(--nav-height) + 2.5rem);
  padding-bottom: 1rem;
  padding-left: 2.5rem;
  padding-right: 2.5rem;
  position: relative;
  z-index: 1;
}

.hero-tagline {
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  white-space: nowrap;
}

.hero-tagline .accent {
  color: var(--nvidia-green);
  -webkit-text-fill-color: var(--nvidia-green);
}

/* --- Paper Details Section --- */
.paper-details-section {
  text-align: center;
  padding-top: 3rem;
  padding-bottom: 1rem;
  border-top: 1px solid var(--border-light);
}

.paper-details-title {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 700;
  color: var(--text-primary);
  max-width: 900px;
  margin: 0 auto 2rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.paper-details-title .accent {
  color: var(--nvidia-green);
  -webkit-text-fill-color: var(--nvidia-green);
}

/* --- Authors --- */
.authors-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.25rem 0.75rem;
  margin: 0 auto 0.5rem;
  max-width: 800px;
}

.author {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.author a {
  color: var(--text-secondary);
  border-bottom: 1px solid transparent;
  transition: all var(--transition-fast);
}

.author a:hover {
  color: var(--nvidia-green);
  border-bottom-color: var(--nvidia-green);
}

.author .equal-contrib {
  font-size: 0.7rem;
  vertical-align: super;
  color: var(--text-muted);
}

.author .affiliation-nums {
  font-size: 0.7rem;
  vertical-align: super;
  color: var(--nvidia-green);
  margin-left: 1px;
}

.affiliations-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.5rem;
  margin-bottom: 2rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.affiliation .aff-num {
  font-weight: 700;
  color: var(--nvidia-green);
  margin-right: 0.25rem;
}

.equal-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 0.5rem;
}

/* --- Institution Logos --- */
.institution-logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2.5rem;
  margin-top: 2.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.institution-logo {
  height: 28px;
  width: auto;
  filter: invert(1) brightness(0.4);
  opacity: 0.5;
  transition: all var(--transition-normal);
}

.institution-logo:hover {
  filter: invert(1) brightness(0) sepia(1) saturate(10) hue-rotate(44deg);
  opacity: 1;
}

.institution-logo[alt="UC Berkeley"] {
  height: 32px;
  position: relative;
  top: 3px;
}

.institution-logo[alt="Stanford"] {
  height: 26px;
}

.institution-logo[alt="CMU"] {
  height: 30px;
  position: relative;
  top: 3px;
}

/* --- Hero Buttons --- */
.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  font-size: 0.85rem;
  font-weight: 700;
  font-family: var(--font-sans);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  transition: all var(--transition-fast);
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--nvidia-green);
  color: var(--text-primary);
}

.btn-primary:hover {
  background: var(--nvidia-green-dark);
  color: var(--text-primary);
}

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 1.5px solid var(--border-light);
  position: relative;
}

.btn-outline::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--nvidia-green);
  transition: width 0.3s ease;
}

.btn-outline:hover {
  color: var(--text-primary);
  border-color: var(--text-primary);
}

.btn-outline:hover::after {
  width: 100%;
}

/* --- Chart Section --- */
.chart-section {
  position: relative;
  z-index: 1;
  padding-top: 0.5rem;
  padding-bottom: 2rem;
}

.chart-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.chart-panel {
  background: linear-gradient(
    160deg,
    rgba(255, 255, 255, 0.65) 0%,
    rgba(255, 255, 255, 0.40) 40%,
    rgba(255, 255, 255, 0.50) 100%
  );
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-top-color: rgba(255, 255, 255, 0.8);
  border-left-color: rgba(255, 255, 255, 0.7);
  padding: 1rem;
  position: relative;
  overflow: hidden;
  box-shadow:
    0 4px 24px rgba(0, 0, 0, 0.06),
    0 1px 2px rgba(0, 0, 0, 0.04),
    inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

/* Animated liquid shine */
.chart-panel::before {
  content: "";
  position: absolute;
  top: -100%;
  left: -100%;
  width: 300%;
  height: 300%;
  background: radial-gradient(
    ellipse at 30% 20%,
    rgba(255, 255, 255, 0.25) 0%,
    transparent 50%
  );
  animation: liquid-shine 10s ease-in-out infinite alternate;
  pointer-events: none;
  z-index: 0;
}

.chart-panel > * {
  position: relative;
  z-index: 1;
}

@keyframes liquid-shine {
  0% { transform: translate(0, 0) rotate(0deg); }
  50% { transform: translate(15%, 10%) rotate(3deg); }
  100% { transform: translate(-10%, 5%) rotate(-2deg); }
}

.chart-header {
  text-align: center;
  margin-bottom: 1rem;
}

#timeline-chart {
  width: 100%;
  background: transparent;
  padding: 0.75rem;
}

.chart-legend {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 1rem;
  padding-bottom: 1rem;
  flex-wrap: wrap;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.legend-circle {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--text-muted);
  background: var(--bg-primary);
}

.legend-circle.dashed {
  border-style: dashed;
}

.legend-line {
  width: 24px;
  height: 0;
  border-top: 2.5px dashed #3B82F6;
}

.legend-line.human {
  border-top-color: #C0392B;
}

/* --- Tooltip --- */
.chart-tooltip {
  position: absolute;
  pointer-events: none;
  background: linear-gradient(
    160deg,
    rgba(255, 255, 255, 0.80) 0%,
    rgba(255, 255, 255, 0.60) 100%
  );
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-top-color: rgba(255, 255, 255, 0.7);
  padding: 0.75rem 1rem;
  font-size: 0.8rem;
  z-index: 100;
  opacity: 0;
  transition: opacity 0.15s ease;
  max-width: 280px;
  box-shadow:
    0 4px 16px rgba(0, 0, 0, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.chart-tooltip.visible {
  opacity: 1;
}

.tooltip-header {
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.tooltip-company {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.tooltip-stat {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.15rem;
}

.tooltip-stat .task-name {
  color: var(--text-secondary);
}

.tooltip-stat .task-value {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* --- CTA Section --- */
.cta-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
}

.cta-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.cta-content p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

.cta-placeholder {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* --- Real-World Demo Section --- */
.demo-section {
  padding: 3rem 2.5rem;
  border-top: 1px solid var(--border-light);
  position: relative;
  overflow: hidden;
}

.demo-section::before {
  content: "";
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #76b900 0%, #a3d940 40%, transparent 70%);
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
  filter: blur(120px);
  opacity: 0.2;
  pointer-events: none;
  z-index: 0;
  animation: aura-drift-demo 10s ease-in-out infinite alternate;
}

@keyframes aura-drift-demo {
  0% { transform: translateX(-50%) scale(1); opacity: 0.15; }
  100% { transform: translateX(-50%) scale(1.1); opacity: 0.25; }
}

.demo-content {
  position: relative;
  z-index: 1;
}

.agent-highlight {
  color: var(--nvidia-green);
  font-weight: 800;
}

.demo-hint {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-top: 0.5rem;
  padding: 0.35rem 1rem;
  background: linear-gradient(
    160deg,
    rgba(255, 255, 255, 0.65) 0%,
    rgba(255, 255, 255, 0.40) 100%
  );
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-top-color: rgba(255, 255, 255, 0.8);
  box-shadow:
    0 2px 12px rgba(0, 0, 0, 0.04),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.demo-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.demo-video-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

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

.demo-video-wrap {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-light);
  transition: border-color var(--transition-fast), box-shadow 0.4s ease;
}

.demo-video-wrap::after {
  content: "⛶";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: #fff;
  background: rgba(0, 0, 0, 0.3);
  opacity: 0;
  transition: opacity var(--transition-fast);
  pointer-events: none;
}

.demo-video-card:hover .demo-video-wrap::after {
  opacity: 1;
}

.demo-video {
  width: 100%;
  display: block;
  pointer-events: none;
}

.demo-video-card:hover .demo-video-wrap {
  border-color: var(--nvidia-green);
  box-shadow: 0 0 20px rgba(118, 185, 0, 0.2), 0 0 50px rgba(118, 185, 0, 0.15), 0 0 100px rgba(118, 185, 0, 0.1);
}

.demo-video-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  text-align: center;
}

.demo-gallery-toggle {
  display: none;
  margin: 1.5rem auto 0;
  padding: 0.5rem 1.5rem;
  font-size: 0.8rem;
  font-weight: 700;
  font-family: var(--font-sans);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border-light);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.demo-gallery-toggle:hover {
  border-color: var(--text-primary);
  color: var(--text-primary);
}

/* --- Demo Modal --- */
.demo-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.demo-modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.demo-modal {
  background: var(--bg-primary);
  max-width: 90vw;
  max-height: 90vh;
  width: 900px;
  overflow-y: auto;
  position: relative;
  transform: scale(0.95) translateY(10px);
  transition: transform 0.3s ease;
}

.demo-modal-overlay.active .demo-modal {
  transform: scale(1) translateY(0);
}

.demo-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  background: var(--bg-primary);
  z-index: 1;
}

.demo-modal-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.demo-modal-close {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border-light);
  background: transparent;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  line-height: 1;
  flex-shrink: 0;
}

.demo-modal-close:hover {
  border-color: var(--text-primary);
  background: var(--bg-secondary);
}

.demo-modal-video {
  width: 100%;
  display: block;
  max-height: 60vh;
  object-fit: contain;
  background: #000;
}

.demo-modal-bar {
  height: 6px;
  background: var(--nvidia-green);
}

.demo-modal-caption {
  padding: 1rem 1.5rem 1.5rem;
}

.demo-modal-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Code badge on video thumbnail */
.demo-code-badge {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  background: rgba(118, 185, 0, 0.9);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 0.25rem 0.55rem;
  pointer-events: none;
  z-index: 2;
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.demo-modal-code {
  padding: 0 1.5rem 1.5rem;
  border-top: 1px solid var(--border-light);
  margin-top: 0.5rem;
}

.demo-modal-code-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
  margin-top: 1rem;
}

.demo-modal-code code[class*="language-"] {
  background: transparent;
}

.demo-modal-code pre,
.demo-modal-code pre[class*="language-"] {
  background: #282c34;
  color: #c5c8c6;
  padding: 1.25rem;
  overflow-x: auto;
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.78rem;
  line-height: 1.65;
  margin: 0;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 0;
  text-shadow: none;
}

/* --- Introduction Section --- */
.intro-section {
  background: linear-gradient(180deg, #f0f0f0 0%, var(--bg-secondary) 40%, var(--bg-secondary) 60%, #f0f0f0 100%);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.intro-content {
  max-width: var(--max-width);
  margin: 0 auto;
}

.intro-title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 800;
  text-align: center;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.intro-text {
  max-width: 720px;
  margin: 0 auto 3rem;
  text-align: center;
}

.intro-text p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1rem;
}

/* Feature pills */
.feature-pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 3rem;
}

.feature-pill {
  padding: 0.4rem 1rem;
  background: transparent;
  border: 1px solid var(--nvidia-green);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--nvidia-green);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* --- Video Gallery --- */
.sim-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.sim-gallery .demo-video-wrap {
  aspect-ratio: 16 / 9;
}

/* --- Highlights Section --- */
.highlights-section {
  max-width: var(--max-width);
  margin: 0 auto;
}

.highlight-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  margin-bottom: 4rem;
  padding: 2.5rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  transition: border-color var(--transition-normal), box-shadow 0.4s ease;
  position: relative;
}

.highlight-card:hover {
  border-color: var(--nvidia-green);
  box-shadow: 0 0 40px rgba(118, 185, 0, 0.1), 0 0 80px rgba(118, 185, 0, 0.05);
}

.highlight-card:nth-child(even) {
  direction: rtl;
}

.highlight-card:nth-child(even) > * {
  direction: ltr;
}

.highlight-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--nvidia-green);
  color: var(--text-primary);
  font-size: 0.8rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.highlight-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.highlight-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.highlight-figure {
  background: var(--bg-secondary);
  min-height: 250px;
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.highlight-figure-placeholder {
  color: var(--text-muted);
  font-size: 0.8rem;
  text-align: center;
}

/* --- Footer --- */
.footer {
  text-align: center;
  padding: 2.5rem;
  background: var(--bg-black);
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* --- Animation Classes --- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
}

.fade-in.active {
  opacity: 1;
  transform: translateY(0);
}

.slide-up {
  opacity: 0;
  transform: translateY(40px);
}

.slide-up.active {
  opacity: 1;
  transform: translateY(0);
}

.scale-in {
  opacity: 0;
  transform: scale(0.95);
}

.scale-in.active {
  opacity: 1;
  transform: scale(1);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  :root {
    --nav-height: 48px;
  }

  .navbar {
    padding: 0 1.25rem;
  }

  .nav-links {
    position: static;
    transform: none;
  }

  .nav-team {
    display: none;
  }

  .nav-link {
    padding: 0.4rem 0.6rem;
    font-size: 0.7rem;
  }

  .section {
    padding: 3rem 1.25rem;
  }

  .section-full {
    padding: 3rem 1.25rem;
  }

  .hero {
    padding-top: calc(var(--nav-height) + 2rem);
    padding-bottom: 1rem;
  }

  .cta-section {
    grid-template-columns: 1fr;
  }

  .highlight-card {
    grid-template-columns: 1fr;
    padding: 1.5rem;
  }

  .highlight-card:nth-child(even) {
    direction: ltr;
  }

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

  /* Aura blobs: shrink so they stay as two distinct blobs */
  .hero-backdrop::before {
    width: 350px;
    height: 350px;
    top: -150px;
    left: -150px;
  }

  .hero-backdrop::after {
    width: 300px;
    height: 300px;
    top: -80px;
    right: -130px;
  }

  /* Title margins */
  .hero {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }

  .hero-tagline {
    white-space: normal;
    padding: 0 0.5rem;
  }

  /* Institution logos: one per row, smaller */
  .institution-logos {
    flex-direction: column;
    gap: 1.25rem;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
  }

  .institution-logo,
  .institution-logo[alt="UC Berkeley"],
  .institution-logo[alt="Stanford"],
  .institution-logo[alt="CMU"] {
    height: 22px;
    top: 0;
  }

  /* Chart: horizontal scroll to preserve aspect ratio */
  .chart-panel {
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
  }

  /* Disable liquid shine on mobile — it causes scroll expansion */
  .chart-panel::before {
    display: none;
  }

  .chart-panel > div {
    min-width: 700px;
    width: 700px;
  }

  /* Demo gallery: 2 columns, collapsible */
  .demo-gallery {
    grid-template-columns: 1fr 1fr;
  }

  .demo-gallery.collapsed .demo-video-card:nth-child(n+5) {
    display: none;
  }

  .demo-gallery-toggle {
    display: block;
  }
}

@media (max-width: 480px) {
  .hero-tagline {
    font-size: 1.75rem;
    white-space: normal;
  }

  .authors-list {
    gap: 0.15rem 0.5rem;
  }

  .author {
    font-size: 0.85rem;
  }

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