/* ===== Design Tokens ===== */
:root {
  --color-bg: #000000;
  --color-bg-secondary: #0a0a0f;
  --color-surface: rgba(255, 255, 255, 0.04);
  --color-surface-hover: rgba(255, 255, 255, 0.08);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-text-primary: #f5f5f7;
  --color-text-secondary: #a1a1a6;
  --color-text-tertiary: #6e6e73;
  --color-accent: #7c6cff;
  --color-accent-alt: #00d4ff;
  --color-accent-pink: #ff6ec7;
  --gradient-hero: linear-gradient(135deg, #7c6cff 0%, #00d4ff 50%, #ff6ec7 100%);
  --gradient-card: linear-gradient(145deg, rgba(124, 108, 255, 0.12) 0%, rgba(0, 212, 255, 0.08) 100%);
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', sans-serif;
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 32px;
  --transition-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  background: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

/* ===== Utility ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-label {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 700;
  letter-spacing: -1.5px;
  line-height: 1.1;
  margin-bottom: 20px;
}

.section-subtitle {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--color-text-secondary);
  max-width: 640px;
  line-height: 1.65;
}

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

/* ===== Scroll Animations ===== */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--transition-smooth), transform 0.8s var(--transition-smooth);
}

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

.reveal-left {
  opacity: 0;
  transform: translateX(-60px);
  transition: opacity 0.8s var(--transition-smooth), transform 0.8s var(--transition-smooth);
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(60px);
  transition: opacity 0.8s var(--transition-smooth), transform 0.8s var(--transition-smooth);
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.8s var(--transition-smooth), transform 0.8s var(--transition-smooth);
}

.reveal-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* Stagger children */
.stagger-children>.reveal:nth-child(1) {
  transition-delay: 0s;
}

.stagger-children>.reveal:nth-child(2) {
  transition-delay: 0.12s;
}

.stagger-children>.reveal:nth-child(3) {
  transition-delay: 0.24s;
}

.stagger-children>.reveal:nth-child(4) {
  transition-delay: 0.36s;
}

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 0 24px;
  transition: background 0.4s ease, backdrop-filter 0.4s ease, border-color 0.4s ease;
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom-color: var(--color-border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.nav-logo span {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color 0.3s ease;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-hero);
  transition: width 0.3s var(--transition-smooth);
  border-radius: 1px;
}

.nav-links a:hover {
  color: var(--color-text-primary);
}

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

.nav-cta {
  padding: 8px 20px;
  border-radius: 100px;
  background: var(--gradient-hero);
  color: #fff !important;
  font-size: 14px;
  font-weight: 600;
  transition: transform 0.3s var(--transition-bounce), box-shadow 0.3s ease;
}

.nav-cta:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 24px rgba(124, 108, 255, 0.4);
}

.nav-cta::after {
  display: none !important;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding: 120px 24px 80px;
}

#hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.hero-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.3;
  pointer-events: none;
}

.hero-glow-1 {
  top: 10%;
  left: 20%;
  background: var(--color-accent);
}

.hero-glow-2 {
  bottom: 10%;
  right: 15%;
  background: var(--color-accent-alt);
}

.hero-glow-3 {
  top: 40%;
  right: 30%;
  background: var(--color-accent-pink);
  width: 400px;
  height: 400px;
  opacity: 0.15;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 100px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  animation: fadeInDown 0.8s var(--transition-smooth) 0.2s both;
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #34d399;
  animation: pulse-dot 2s ease infinite;
}

.hero h1 {
  font-size: clamp(48px, 8vw, 96px);
  font-weight: 800;
  letter-spacing: -3px;
  line-height: 1.0;
  margin-bottom: 24px;
  animation: fadeInUp 0.8s var(--transition-smooth) 0.4s both;
}

.hero p {
  font-size: clamp(16px, 2.2vw, 22px);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.6;
  animation: fadeInUp 0.8s var(--transition-smooth) 0.6s both;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s var(--transition-smooth) 0.8s both;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 100px;
  background: var(--gradient-hero);
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.3s var(--transition-bounce), box-shadow 0.3s ease;
}

.btn-primary:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 32px rgba(124, 108, 255, 0.4);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 100px;
  background: var(--color-surface);
  color: var(--color-text-primary);
  font-size: 16px;
  font-weight: 600;
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: transform 0.3s var(--transition-bounce), background 0.3s ease, border-color 0.3s ease;
}

.btn-secondary:hover {
  transform: scale(1.05);
  background: var(--color-surface-hover);
  border-color: rgba(255, 255, 255, 0.2);
}

.hero-scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-text-tertiary);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  animation: fadeIn 1s var(--transition-smooth) 1.2s both;
}

.scroll-mouse {
  width: 24px;
  height: 38px;
  border-radius: 12px;
  border: 2px solid var(--color-text-tertiary);
  position: relative;
}

.scroll-mouse::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 8px;
  border-radius: 2px;
  background: var(--color-text-tertiary);
  animation: scroll-wheel 2s ease infinite;
}

/* ===== Comparison Section ===== */
.comparison {
  padding: 160px 24px;
  position: relative;
}

.comparison-header {
  text-align: center;
  margin-bottom: 80px;
}

.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 80px 1fr;
  gap: 0;
  max-width: 1000px;
  margin: 0 auto;
  align-items: start;
}

.comparison-column {
  padding: 0 24px;
}

.comparison-column h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 32px;
  letter-spacing: -0.5px;
}

.comparison-column.traditional h3 {
  color: var(--color-text-tertiary);
}

.comparison-column.world-model h3 {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.comparison-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

.comparison-item .item-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  margin-bottom: 8px;
}

.comparison-item .item-value {
  font-size: 17px;
  font-weight: 500;
  line-height: 1.5;
}

.comparison-column.traditional .item-value {
  color: var(--color-text-secondary);
}

.comparison-column.world-model .item-value {
  color: var(--color-text-primary);
}

.comparison-divider {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 72px;
  gap: 0;
}

.divider-line {
  width: 1px;
  flex: 1;
  background: linear-gradient(to bottom, transparent, var(--color-border), transparent);
  min-height: 400px;
}

.divider-vs {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text-tertiary);
  padding: 16px 0;
  letter-spacing: 2px;
}

/* ===== Features Section ===== */
.features {
  padding: 160px 24px;
  position: relative;
}

.features-header {
  text-align: center;
  margin-bottom: 80px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 48px 36px;
  position: relative;
  overflow: hidden;
  transition: transform 0.5s var(--transition-smooth), border-color 0.5s ease, box-shadow 0.5s ease;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--gradient-hero);
  opacity: 0;
  transition: opacity 0.5s ease;
}

.feature-card:hover {
  transform: translateY(-8px);
  border-color: rgba(124, 108, 255, 0.2);
  box-shadow: 0 20px 60px rgba(124, 108, 255, 0.1);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 28px;
  font-size: 28px;
  position: relative;
}

.feature-icon.ugc {
  background: linear-gradient(135deg, rgba(124, 108, 255, 0.2), rgba(124, 108, 255, 0.05));
}

.feature-icon.multiplayer {
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.2), rgba(0, 212, 255, 0.05));
}

.feature-icon.infinite {
  background: linear-gradient(135deg, rgba(255, 110, 199, 0.2), rgba(255, 110, 199, 0.05));
}

.feature-card h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.feature-card p {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.feature-tag {
  font-size: 12px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 100px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border);
  color: var(--color-text-tertiary);
}

/* ===== How it Works ===== */
.how-it-works {
  padding: 160px 24px;
  position: relative;
}

.how-it-works-header {
  text-align: center;
  margin-bottom: 80px;
}

.steps {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.steps::before {
  content: '';
  position: absolute;
  top: 0;
  left: 36px;
  width: 2px;
  height: 100%;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-accent-alt), var(--color-accent-pink));
  border-radius: 1px;
}

.step {
  display: flex;
  gap: 32px;
  margin-bottom: 60px;
  position: relative;
}

.step:last-child {
  margin-bottom: 0;
}

.step-number {
  width: 72px;
  height: 72px;
  min-width: 72px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 800;
  position: relative;
  z-index: 1;
}

.step-content h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.3px;
  padding-top: 4px;
}

.step-content p {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ===== CTA Section ===== */
.cta {
  padding: 160px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-glow {
  position: absolute;
  width: 800px;
  height: 400px;
  border-radius: 50%;
  filter: blur(150px);
  opacity: 0.15;
  background: var(--color-accent);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 2;
}

.cta h2 {
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 800;
  letter-spacing: -2px;
  line-height: 1.05;
  margin-bottom: 24px;
}

.cta p {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--color-text-secondary);
  max-width: 520px;
  margin: 0 auto 40px;
  line-height: 1.6;
}

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 48px 24px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-copyright {
  font-size: 14px;
  color: var(--color-text-tertiary);
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-links a {
  font-size: 14px;
  color: var(--color-text-tertiary);
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: var(--color-text-primary);
}

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

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

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }

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

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes pulse-dot {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.4;
  }
}

@keyframes scroll-wheel {
  0% {
    opacity: 1;
    transform: translate(-50%, 0);
  }

  100% {
    opacity: 0;
    transform: translate(-50%, 12px);
  }
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0px);
  }

  50% {
    transform: translateY(-10px);
  }
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .features-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
  }

  .comparison-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .comparison-divider {
    flex-direction: row;
    padding-top: 0;
  }

  .divider-line {
    width: auto;
    height: 1px;
    min-height: unset;
    flex: 1;
  }

  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }
}

@media (max-width: 600px) {
  .hero h1 {
    letter-spacing: -1.5px;
  }

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

  .btn-primary,
  .btn-secondary {
    width: 100%;
    justify-content: center;
    max-width: 300px;
  }

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

  .step {
    gap: 20px;
  }

  .step-number {
    width: 56px;
    height: 56px;
    min-width: 56px;
    font-size: 20px;
  }

  .steps::before {
    left: 28px;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}