@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&family=Noto+Sans+KR:wght@300;400;500;600;700&display=swap";

/* index.css */
*, *:before, *:after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #050508;
  --surface: #0d0d12;
  --surface-2: #141418;
  --surface-3: #1a1a1f;
  --border: #222228;
  --border-hover: #333338;
  --text: #e8e8e8;
  --text-dim: #888;
  --text-muted: #555;
  --accent: #4f9eff;
  --accent-dim: #4f9eff14;
  --accent-glow: #4f9eff26;
  --accent-strong: #4f9eff40;
  --layer1: #4f9eff;
  --layer2: #a78bfa;
  --layer3: #f59e0b;
  --layer4: #10b981;
  --layer5: #f472b6;
  --font-sans: "Inter", "Noto Sans KR", -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", monospace;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  min-height: 100vh;
  line-height: 1.6;
}

.grid-bg {
  position: fixed;
  opacity: .5;
  pointer-events: none;
  z-index: 0;
  background-image: linear-gradient(#4f9eff0f 1px, #0000 1px), linear-gradient(90deg, #4f9eff0f 1px, #0000 1px);
  background-size: 60px 60px;
  inset: 0;
}

.noise-overlay {
  position: fixed;
  opacity: .035;
  pointer-events: none;
  z-index: 1;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
  inset: 0;
}

#root {
  position: relative;
  z-index: 2;
}

.nav {
  position: fixed;
  z-index: 100;
  backdrop-filter: blur(12px) saturate(1.2);
  -webkit-backdrop-filter: blur(12px) saturate(1.2);
  border-bottom: 1px solid var(--border);
  background: #050505cc;
  padding: 0 24px;
  top: 0;
  left: 0;
  right: 0;
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items:  center;
  max-width: 1200px;
  height: 56px;
  margin: 0 auto;
}

.nav-logo {
  font-family: var(--font-mono);
  letter-spacing: 3px;
  color: var(--text);
  text-decoration: none;
  font-size: .8rem;
  font-weight: 600;
}

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

.nav-links a {
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  transition: color .2s;
  font-size: .75rem;
  font-weight: 500;
}

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

.nav-version {
  font-family: var(--font-mono);
  color: var(--text-muted);
  letter-spacing: 1px;
  font-size: .65rem;
}

.hero {
  display: flex;
  text-align: center;
  position: relative;
  flex-direction: column;
  justify-content: center;
  align-items:  center;
  min-height: 100vh;
  padding: 120px 24px 80px;
}

.hero-glow {
  position: absolute;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  animation: pulse-glow 6s ease-in-out infinite;
  border-radius: 50%;
  width: 600px;
  height: 600px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

@keyframes pulse-glow {
  0%, 100% {
    opacity: .3;
    transform: translate(-50%, -50%)scale(1);
  }

  50% {
    opacity: .6;
    transform: translate(-50%, -50%)scale(1.1);
  }
}

.hero-label {
  font-family: var(--font-mono);
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--accent);
  opacity: 0;
  animation: fade-up .8s ease forwards .2s;
  margin-bottom: 32px;
  font-size: .7rem;
  font-weight: 500;
}

.hero-title {
  letter-spacing: -2px;
  background: linear-gradient(180deg, #fff 30%, var(--text-dim) 100%);
  -webkit-text-fill-color: transparent;
  opacity: 0;
  animation: fade-up 1s ease forwards .4s;
  -webkit-background-clip: text;
  background-clip: text;
  margin-bottom: 24px;
  font-size: clamp(3rem, 8vw, 7rem);
  font-weight: 900;
  line-height: .95;
}

.hero-subtitle {
  color: var(--text-dim);
  opacity: 0;
  animation: fade-up .8s ease forwards .7s;
  max-width: 540px;
  margin-bottom: 48px;
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 300;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  opacity: 0;
  animation: fade-up .8s ease forwards .9s;
  gap: 16px;
}

.btn-primary {
  font-family: var(--font-mono);
  letter-spacing: 2px;
  text-transform: uppercase;
  border: 1px solid var(--accent);
  background: var(--accent-dim);
  color: var(--accent);
  cursor: pointer;
  text-decoration: none;
  border-radius: 8px;
  padding: 14px 32px;
  transition: all .25s;
  font-size: .75rem;
  font-weight: 600;
}

.btn-primary:hover {
  background: var(--accent-strong);
  box-shadow: 0 0 30px var(--accent-glow);
}

.btn-ghost {
  font-family: var(--font-mono);
  letter-spacing: 2px;
  text-transform: uppercase;
  border: 1px solid var(--border);
  color: var(--text-dim);
  cursor: pointer;
  text-decoration: none;
  background: none;
  border-radius: 8px;
  padding: 14px 32px;
  transition: all .25s;
  font-size: .75rem;
  font-weight: 600;
}

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

.hero-scroll-hint {
  position: absolute;
  display: flex;
  color: var(--text-muted);
  font-size: .65rem;
  font-family: var(--font-mono);
  letter-spacing: 2px;
  text-transform: uppercase;
  animation: fade-in 1s ease forwards 1.2s;
  opacity: 0;
  flex-direction: column;
  align-items:  center;
  gap: 8px;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
}

.scroll-line {
  background: linear-gradient(180deg, var(--text-muted) 0%, transparent 100%);
  animation: scroll-pulse 2s ease-in-out infinite;
  width: 1px;
  height: 40px;
}

@keyframes scroll-pulse {
  0%, 100% {
    opacity: .3;
  }

  50% {
    opacity: 1;
  }
}

.section {
  max-width: 1000px;
  margin: 0 auto;
  padding: 120px 24px;
}

.section-label {
  font-family: var(--font-mono);
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
  font-size: .65rem;
  font-weight: 600;
}

.section-title {
  letter-spacing: -1px;
  margin-bottom: 16px;
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.15;
}

.section-desc {
  color: var(--text-dim);
  max-width: 600px;
  margin-bottom: 48px;
  font-size: 1rem;
  font-weight: 300;
  line-height: 1.7;
}

.stats-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  background: var(--border);
  border: 1px solid var(--border);
  overflow: hidden;
  border-radius: 16px;
  gap: 1px;
  max-width: 900px;
  margin: 0 auto;
}

.stat-item {
  background: var(--surface);
  text-align: center;
  padding: 48px 32px;
  transition: background .3s;
}

.stat-item:hover {
  background: var(--surface-2);
}

.stat-number {
  font-family: var(--font-mono);
  letter-spacing: -1px;
  margin-bottom: 8px;
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
}

.stat-item:first-child .stat-number {
  color: var(--layer1);
}

.stat-item:nth-child(2) .stat-number {
  color: var(--layer3);
}

.stat-item:nth-child(3) .stat-number {
  color: var(--layer4);
}

.stat-label {
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-size: .75rem;
  font-weight: 500;
}

.stat-desc {
  color: var(--text-dim);
  font-size: .82rem;
  font-weight: 300;
  line-height: 1.6;
}

.layers-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.layer-card {
  background: var(--surface);
  border: 1px solid var(--border);
  overflow: hidden;
  cursor: pointer;
  position: relative;
  border-radius: 16px;
  transition: all .3s;
}

.layer-card:before {
  content: "";
  position: absolute;
  opacity: 0;
  height: 1px;
  transition: opacity .3s;
  top: 0;
  left: 0;
  right: 0;
}

.layer-1:before {
  background: linear-gradient(90deg, transparent, var(--layer1), transparent);
}

.layer-2:before {
  background: linear-gradient(90deg, transparent, var(--layer2), transparent);
}

.layer-3:before {
  background: linear-gradient(90deg, transparent, var(--layer3), transparent);
}

.layer-4:before {
  background: linear-gradient(90deg, transparent, var(--layer4), transparent);
}

.layer-5:before {
  background: linear-gradient(90deg, transparent, var(--layer5), transparent);
}

.layer-card:hover {
  border-color: var(--border-hover);
}

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

.layer-card.active {
  border-color: var(--border-hover);
}

.layer-card.active:before {
  opacity: 1;
}

.layer-header {
  display: flex;
  align-items:  center;
  gap: 20px;
  padding: 24px 28px;
}

.layer-number-badge {
  font-family: var(--font-mono);
  display: flex;
  letter-spacing: 1px;
  border-radius: 12px;
  flex-shrink: 0;
  justify-content: center;
  align-items:  center;
  width: 48px;
  height: 48px;
  font-size: .65rem;
  font-weight: 600;
}

.layer-1 .layer-number-badge {
  color: var(--layer1);
  background: #4f9eff14;
  border: 1px solid #4f9eff26;
}

.layer-2 .layer-number-badge {
  color: var(--layer2);
  background: #a78bfa14;
  border: 1px solid #a78bfa26;
}

.layer-3 .layer-number-badge {
  color: var(--layer3);
  background: #f59e0b14;
  border: 1px solid #f59e0b26;
}

.layer-4 .layer-number-badge {
  color: var(--layer4);
  background: #10b98114;
  border: 1px solid #10b98126;
}

.layer-5 .layer-number-badge {
  color: var(--layer5);
  background: #f472b614;
  border: 1px solid #f472b626;
}

.layer-info {
  flex: 1;
  min-width: 0;
}

.layer-title {
  letter-spacing: -.3px;
  margin-bottom: 4px;
  font-size: 1.1rem;
  font-weight: 600;
}

.layer-subtitle {
  color: var(--text-dim);
  font-size: .8rem;
  font-weight: 300;
}

.layer-chevron {
  color: var(--text-muted);
  font-size: .7rem;
  font-family: var(--font-mono);
  flex-shrink: 0;
  transition: transform .3s;
}

.layer-card.active .layer-chevron {
  transform: rotate(180deg);
}

.layer-body {
  overflow: hidden;
  max-height: 0;
  transition: max-height .4s cubic-bezier(.4,0,.2,1), padding .4s cubic-bezier(.4,0,.2,1);
}

.layer-card.active .layer-body {
  max-height: 600px;
  padding: 0 28px 28px;
}

.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.comparison-box {
  border-radius: 12px;
  padding: 20px;
  font-size: .85rem;
  line-height: 1.8;
}

.comparison-box.raw {
  border: 1px solid var(--border);
  background: #ffffff05;
}

.comparison-box.enhanced {
  background: var(--accent-dim);
  border: 1px solid #4f9eff33;
}

.comparison-label {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 2px;
  display: block;
  margin-bottom: 10px;
  font-size: .6rem;
  font-weight: 600;
}

.comparison-box.raw .comparison-label {
  color: var(--text-muted);
}

.comparison-box.enhanced .comparison-label {
  color: var(--accent);
}

.why-section {
  background: #ffffff04;
  border-left: 2px solid;
  border-radius: 12px;
  margin-bottom: 12px;
  padding: 20px;
  font-size: .85rem;
  line-height: 1.8;
}

.layer-1 .why-section {
  border-color: var(--layer1);
}

.layer-2 .why-section {
  border-color: var(--layer2);
}

.layer-3 .why-section {
  border-color: var(--layer3);
}

.layer-4 .why-section {
  border-color: var(--layer4);
}

.layer-5 .why-section {
  border-color: var(--layer5);
}

.why-label {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-dim);
  display: block;
  margin-bottom: 8px;
  font-size: .6rem;
  font-weight: 600;
}

.component-badge {
  display: inline-block;
  font-family: var(--font-mono);
  color: var(--text-muted);
  border: 1px solid var(--border);
  background: #ffffff08;
  border-radius: 6px;
  padding: 6px 12px;
  font-size: .65rem;
}

.laws-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  background: var(--border);
  border: 1px solid var(--border);
  overflow: hidden;
  border-radius: 16px;
  gap: 1px;
}

.law-card {
  background: var(--surface);
  padding: 40px 32px;
  transition: background .3s;
}

.law-card:hover {
  background: var(--surface-2);
}

.law-number {
  font-family: var(--font-mono);
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
  font-size: .6rem;
  font-weight: 600;
}

.law-title {
  letter-spacing: -.3px;
  margin-bottom: 12px;
  font-size: 1.1rem;
  font-weight: 700;
}

.law-desc {
  color: var(--text-dim);
  font-size: .85rem;
  font-weight: 300;
  line-height: 1.7;
}

.scale-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.scale-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  transition: all .3s;
}

.scale-card:hover {
  border-color: var(--border-hover);
}

.scale-card.highlight {
  background: linear-gradient(135deg, var(--surface) 0%, #4f9eff0a 100%);
  border-color: #4f9eff4d;
}

.scale-framework {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: .6rem;
  font-weight: 600;
}

.scale-card.highlight .scale-framework {
  color: var(--accent);
}

.scale-level {
  letter-spacing: -.3px;
  margin-bottom: 12px;
  font-size: 1.2rem;
  font-weight: 700;
}

.scale-desc {
  color: var(--text-dim);
  font-size: .82rem;
  font-weight: 300;
  line-height: 1.6;
}

.cta-section {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
  padding: 120px 24px 160px;
}

.cta-title {
  letter-spacing: -1px;
  margin-bottom: 16px;
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 800;
}

.cta-desc {
  color: var(--text-dim);
  margin-bottom: 40px;
  font-size: 1rem;
  font-weight: 300;
  line-height: 1.7;
}

.footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 40px 24px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items:  center;
  max-width: 1000px;
  margin: 0 auto;
}

.footer-brand {
  font-family: var(--font-mono);
  color: var(--text-muted);
  letter-spacing: 2px;
  font-size: .7rem;
}

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

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color .2s;
  font-size: .75rem;
}

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

.footer-copy {
  color: var(--text-muted);
  font-size: .65rem;
  font-family: var(--font-mono);
  letter-spacing: 1px;
}

.divider {
  background: linear-gradient(90deg, transparent, var(--border-hover), transparent);
  max-width: 1000px;
  height: 1px;
  margin: 0 auto;
}

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

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

@keyframes fade-in {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.fade-in-section {
  opacity: 0;
  transition: opacity .8s cubic-bezier(.25,.46,.45,.94), transform .8s cubic-bezier(.25,.46,.45,.94);
  transform: translateY(24px);
}

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

@media (prefers-reduced-motion: reduce) {
  .fade-in-section {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hero {
    min-height: 90vh;
    padding: 100px 20px 60px;
  }

  .hero-glow {
    width: 300px;
    height: 300px;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    max-width: 300px;
  }

  .section {
    padding: 80px 20px;
  }

  .stats-bar, .comparison, .laws-grid, .scale-grid {
    grid-template-columns: 1fr;
  }

  .layer-header {
    padding: 20px;
  }

  .layer-card.active .layer-body {
    padding: 0 20px 20px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 16px;
  }

  .hero-scroll-hint {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero-title {
    letter-spacing: -1px;
  }

  .stat-item {
    padding: 32px 24px;
  }

  .law-card {
    padding: 28px 24px;
  }
}