:root {
  --surface-base: #f4f7fb;
  --surface-primary: #ffffff;
  --surface-navy: #07152e;
  --surface-navy-raised: #102446;
  --text-primary: #12213b;
  --text-secondary: #53627a;
  --text-on-dark: #f7fbff;
  --text-on-dark-muted: #b7c9e8;
  --border-default: #d8e1ee;
  --border-dark: #294568;
  --accent-cyan: #42d4e8;
  --accent-cyan-strong: #08758a;
  --accent-coral: #ff785f;
  --status-success: #167d5a;
  --status-caution: #a85b00;
  --shadow-inset: inset 0 1px color-mix(in srgb, var(--text-on-dark) 12%, transparent);
  --shadow-raised: 0 24px 64px color-mix(in srgb, var(--surface-navy) 58%, transparent);
  --shadow-callout: 0 24px 72px color-mix(in srgb, var(--surface-navy) 14%, transparent);
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --radius-small: 0.5rem;
  --radius-medium: 1rem;
  --radius-large: 1.5rem;
  --content-width: 76rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text-primary);
  background: var(--surface-base);
  font-family: "Pretendard", "Noto Sans KR", "Segoe UI", system-ui, sans-serif;
  font-size: 1rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

p {
  text-wrap: pretty;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  text-wrap: balance;
}

code,
pre {
  font-family: "SFMono-Regular", "Cascadia Code", "Liberation Mono", monospace;
}

.skip-link {
  position: fixed;
  top: var(--space-4);
  left: var(--space-4);
  z-index: 2;
  padding: var(--space-3) var(--space-4);
  color: var(--surface-navy);
  background: var(--accent-cyan);
  border-radius: var(--radius-small);
  font-weight: 720;
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: translateY(0);
}

.hero {
  min-height: 100dvh;
  overflow: hidden;
  color: var(--text-on-dark);
  background:
    radial-gradient(circle at 15% 10%, color-mix(in srgb, var(--accent-cyan) 24%, transparent), transparent 34%),
    radial-gradient(circle at 88% 74%, color-mix(in srgb, var(--accent-coral) 12%, transparent), transparent 28%),
    linear-gradient(145deg, var(--surface-navy) 18%, var(--surface-navy-raised) 100%);
}

.site-nav,
.hero-grid,
.section,
.evidence-strip,
.site-footer {
  width: min(calc(100% - var(--space-8)), var(--content-width));
  margin-inline: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--space-20);
  gap: var(--space-6);
  border-bottom: 1px solid var(--border-dark);
}

.brand,
.nav-links a {
  text-decoration: none;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 720;
  letter-spacing: -0.02em;
}

.brand-mark {
  width: var(--space-4);
  height: var(--space-4);
  background: var(--accent-cyan);
  border-radius: var(--space-1);
  box-shadow: var(--shadow-inset);
  transform: rotate(45deg);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  color: var(--text-on-dark-muted);
  font-size: 0.875rem;
  font-weight: 720;
}

.nav-links a {
  padding-block: var(--space-2);
  transition: color 160ms ease-out, transform 120ms ease-out;
}

.nav-links a:hover {
  color: var(--text-on-dark);
  transform: translateY(-2px);
}

.nav-links a:active {
  transform: translateY(0);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(22rem, 0.92fr);
  align-items: center;
  gap: var(--space-16);
  padding-block: var(--space-20) var(--space-24);
}

.hero-copy {
  max-width: 44rem;
}

.overline {
  margin-bottom: var(--space-4);
  color: var(--accent-cyan-strong);
  font-size: 0.75rem;
  font-weight: 720;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.hero .overline {
  color: var(--accent-cyan);
}

.hero h1 {
  margin-bottom: var(--space-6);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 760;
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.hero-lead {
  max-width: 40rem;
  margin-bottom: var(--space-4);
  color: var(--text-on-dark-muted);
  font-size: 1.125rem;
  line-height: 1.7;
}

.korean-summary {
  max-width: 40rem;
  margin-bottom: var(--space-8);
  color: var(--text-on-dark);
  word-break: keep-all;
}

.hero-actions,
.adoption-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--space-12);
  padding: var(--space-3) var(--space-5);
  border: 1px solid transparent;
  border-radius: var(--radius-small);
  font-weight: 720;
  line-height: 1.25;
  text-align: center;
  text-decoration: none;
  transition: color 160ms ease-out, background-color 160ms ease-out, border-color 160ms ease-out, transform 120ms ease-out;
}

.action:hover {
  transform: translateY(-2px);
}

.action:active {
  transform: translateY(1px);
}

.action-primary {
  color: var(--surface-navy);
  background: var(--accent-cyan);
}

.action-primary:hover {
  background: var(--text-on-dark);
}

.action-outline {
  color: var(--text-on-dark);
  border-color: var(--border-dark);
  background: color-mix(in srgb, var(--surface-primary) 4%, transparent);
}

.action-outline:hover {
  border-color: var(--accent-cyan);
}

.action-dark {
  color: var(--text-on-dark);
  background: var(--surface-navy);
}

.action-dark:hover {
  background: var(--surface-navy-raised);
}

.scope-note {
  max-width: 38rem;
  margin: var(--space-5) 0 0;
  color: var(--text-on-dark-muted);
  font-size: 0.875rem;
}

.pipeline-figure {
  margin: 0;
  padding: var(--space-6);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-large);
  background: color-mix(in srgb, var(--surface-navy-raised) 58%, transparent);
  box-shadow: var(--shadow-raised), var(--shadow-inset);
  animation: pipeline-reveal 420ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.pipeline-figure figcaption {
  margin-bottom: var(--space-5);
  color: var(--text-on-dark-muted);
  font-size: 0.75rem;
  font-weight: 720;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.pipeline {
  display: grid;
  gap: var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}

.pipeline li {
  position: relative;
  display: grid;
  gap: var(--space-1);
  padding: var(--space-4);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-medium);
  background: var(--surface-navy-raised);
  box-shadow: var(--shadow-inset);
}

.pipeline li:not(:last-child)::after {
  position: absolute;
  bottom: calc(var(--space-4) * -1);
  left: var(--space-8);
  width: 2px;
  height: var(--space-4);
  background: var(--accent-cyan);
  content: "";
}

.pipeline strong {
  font-size: 1.125rem;
  line-height: 1.35;
}

.pipeline small {
  color: var(--text-on-dark-muted);
  font-size: 0.875rem;
}

.node-label {
  color: var(--accent-cyan);
  font-family: "SFMono-Regular", "Cascadia Code", "Liberation Mono", monospace;
  font-size: 0.75rem;
}

.evidence-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: calc(var(--space-8) * -1);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-medium);
  background: var(--surface-primary);
  box-shadow: var(--shadow-callout);
}

.evidence-strip a {
  display: grid;
  gap: var(--space-1);
  min-width: 0;
  padding: var(--space-5);
  text-decoration: none;
  transition: background-color 160ms ease-out, transform 120ms ease-out;
}

.evidence-strip a + a {
  border-left: 1px solid var(--border-default);
}

.evidence-strip a:hover {
  background: var(--surface-base);
  transform: translateY(-2px);
}

.evidence-strip a:active {
  transform: translateY(0);
}

.evidence-strip span {
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 720;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.evidence-strip strong {
  font-size: 0.875rem;
}

.section {
  padding-block: var(--space-20);
}

.demo-section,
.evidence-layout,
.adoption-section {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-12);
  align-items: center;
}

.section-heading {
  max-width: 34rem;
}

.section-heading.narrow {
  max-width: 46rem;
}

.section h2 {
  margin-bottom: var(--space-5);
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 740;
  line-height: 1.04;
  letter-spacing: -0.045em;
}

.section-heading > p:last-child,
.adoption-section > div > p:last-child {
  color: var(--text-secondary);
  font-size: 1.125rem;
}

.terminal {
  overflow: hidden;
  color: var(--text-on-dark);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-medium);
  background: var(--surface-navy);
  box-shadow: var(--shadow-raised);
}

.terminal-bar {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  color: var(--text-on-dark-muted);
  border-bottom: 1px solid var(--border-dark);
  font-size: 0.75rem;
}

.terminal pre {
  overflow-x: auto;
  margin: 0;
  padding: var(--space-6);
  font-size: 0.875rem;
  line-height: 1.65;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}

.terminal p {
  margin: 0;
  padding: 0 var(--space-6) var(--space-6);
  color: var(--text-on-dark-muted);
  font-size: 0.875rem;
}

.terminal p code {
  color: var(--accent-cyan);
}

.evidence-section {
  border-top: 1px solid var(--border-default);
}

.evidence-layout {
  margin-top: var(--space-10);
  align-items: stretch;
}

.evidence-column {
  padding: var(--space-8) 0;
}

.evidence-column.limitation {
  padding-inline: var(--space-8);
  border-left: 1px solid var(--border-default);
}

.status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  font-size: 0.875rem;
  font-weight: 720;
}

.status::before {
  width: var(--space-2);
  height: var(--space-2);
  border-radius: 50%;
  content: "";
}

.status-verified {
  color: var(--status-success);
}

.status-verified::before {
  background: var(--status-success);
}

.status-caution {
  color: var(--status-caution);
}

.status-caution::before {
  background: var(--accent-coral);
}

.proof-list {
  display: grid;
  gap: var(--space-5);
  margin: 0 0 var(--space-6);
  padding: 0;
  list-style: none;
}

.proof-list li {
  display: grid;
  gap: var(--space-1);
}

.proof-list strong {
  font-size: 1.125rem;
}

.proof-list span {
  color: var(--text-secondary);
}

.text-link {
  color: var(--text-primary);
  font-weight: 720;
  text-decoration-color: var(--accent-cyan-strong);
  text-decoration-thickness: 2px;
  text-underline-offset: var(--space-1);
}

.text-link:hover {
  color: var(--accent-cyan-strong);
}

.adoption-section {
  margin-bottom: var(--space-20);
  padding: var(--space-10);
  color: var(--text-on-dark);
  border-radius: var(--radius-large);
  background:
    radial-gradient(circle at 100% 0, color-mix(in srgb, var(--accent-cyan) 18%, transparent), transparent 36%),
    var(--surface-navy-raised);
  box-shadow: var(--shadow-callout);
}

.adoption-section .overline {
  color: var(--accent-cyan);
}

.adoption-section > div > p:last-child {
  color: var(--text-on-dark-muted);
}

.adoption-actions {
  justify-content: flex-end;
}

.adoption-actions .text-link {
  color: var(--text-on-dark);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: var(--space-6);
  padding-block: var(--space-8);
  color: var(--text-secondary);
  border-top: 1px solid var(--border-default);
  font-size: 0.875rem;
}

.site-footer p {
  margin: 0;
}

.site-footer div {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
}

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

a:focus-visible {
  outline: 3px solid var(--accent-cyan-strong);
  outline-offset: var(--space-1);
}

@keyframes pipeline-reveal {
  from {
    opacity: 0;
    transform: translateY(var(--space-4));
  }

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

@media (max-width: 64rem) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    max-width: 52rem;
  }

  .pipeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .pipeline li:not(:last-child)::after {
    display: none;
  }
}

@media (max-width: 48rem) {
  .site-nav {
    align-items: flex-start;
    padding-block: var(--space-5);
  }

  .nav-links {
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: var(--space-3) var(--space-5);
  }

  .hero-grid {
    gap: var(--space-10);
    padding-block: var(--space-16) var(--space-20);
  }

  .evidence-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .evidence-strip a:nth-child(3) {
    border-left: 0;
    border-top: 1px solid var(--border-default);
  }

  .evidence-strip a:nth-child(4) {
    border-top: 1px solid var(--border-default);
  }

  .demo-section,
  .evidence-layout,
  .adoption-section {
    grid-template-columns: 1fr;
  }

  .evidence-column.limitation {
    padding-inline: 0;
    border-top: 1px solid var(--border-default);
    border-left: 0;
  }

  .adoption-actions {
    justify-content: flex-start;
  }
}

@media (max-width: 30rem) {
  .site-nav {
    display: grid;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .nav-links a:nth-child(2),
  .nav-links a:nth-child(3) {
    display: none;
  }

  .hero h1 {
    font-size: clamp(2.5rem, 13vw, 4rem);
  }

  .pipeline,
  .evidence-strip {
    grid-template-columns: 1fr;
  }

  .evidence-strip a + a,
  .evidence-strip a:nth-child(3) {
    border-top: 1px solid var(--border-default);
    border-left: 0;
  }

  .action {
    width: 100%;
  }

  .section {
    padding-block: var(--space-16);
  }

  .adoption-section {
    padding: var(--space-6);
  }

  .site-footer {
    display: grid;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}