:root {
  --black: #050505;
  --panel: #0c0d10;
  --raised: #12151b;
  --paper: #f3f4f6;
  --white: #ffffff;
  --text: #f3f4f6;
  --muted: rgba(243, 244, 246, 0.72);
  --hair: rgba(255, 255, 255, 0.12);
  --cyan: #06b6d4;
  --lime: #bef264;
  --pink: #f472b6;
  --orange: #f59e0b;
  --glow-cyan: 0 0 42px rgba(6, 182, 212, 0.18);
  --glow-lime: 0 0 42px rgba(190, 242, 100, 0.16);
  --shadow-panel: 0 30px 90px rgba(0, 0, 0, 0.36);
  --focus: 0 0 0 4px rgba(6, 182, 212, 0.32);
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  --max: 1180px;
  --nav-height: 72px;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(180deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    radial-gradient(circle at 72% 8%, rgba(6, 182, 212, 0.16), transparent 34rem),
    radial-gradient(circle at 12% 26%, rgba(190, 242, 100, 0.1), transparent 28rem),
    var(--black);
  background-size: 84px 84px, 84px 84px, auto, auto, auto;
  color: var(--text);
  font-family: "Pretendard Variable", Pretendard, "Apple SD Gothic Neo", "Noto Sans KR", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: 0;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

::selection {
  background: var(--lime);
  color: var(--black);
}

.skip-link {
  position: fixed;
  left: var(--space-4);
  top: var(--space-4);
  z-index: 30;
  transform: translateY(-160%);
  border: 1px solid var(--lime);
  background: var(--panel);
  color: var(--lime);
  padding: var(--space-3) var(--space-4);
  transition: transform 160ms ease-out;
}

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

.section-wrap {
  width: min(calc(100% - 40px), var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--hair);
  background: rgba(5, 5, 5, 0.78);
  backdrop-filter: blur(18px);
}

.nav-shell {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-6);
  min-height: var(--nav-height);
  width: min(calc(100% - 40px), var(--max));
  margin-inline: auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: fit-content;
  color: var(--white);
  font-family: "Space Grotesk", "Pretendard Variable", Pretendard, sans-serif;
  font-size: 14px;
  font-weight: 880;
  line-height: 1;
}

.brand-mark {
  position: relative;
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border: 1px solid rgba(190, 242, 100, 0.55);
  border-radius: 7px;
  background:
    linear-gradient(var(--lime), var(--lime)) left 5px top 5px / 10px 1px no-repeat,
    linear-gradient(var(--lime), var(--lime)) right 5px top 5px / 10px 1px no-repeat,
    linear-gradient(var(--cyan), var(--cyan)) left 5px bottom 5px / 10px 1px no-repeat,
    linear-gradient(var(--cyan), var(--cyan)) right 5px bottom 5px / 10px 1px no-repeat,
    linear-gradient(90deg, var(--lime), var(--lime)) left 5px top 5px / 1px 10px no-repeat,
    linear-gradient(90deg, var(--lime), var(--lime)) right 5px top 5px / 1px 10px no-repeat,
    linear-gradient(90deg, var(--cyan), var(--cyan)) left 5px bottom 5px / 1px 10px no-repeat,
    linear-gradient(90deg, var(--cyan), var(--cyan)) right 5px bottom 5px / 1px 10px no-repeat,
    radial-gradient(circle at 50% 50%, rgba(6, 182, 212, 0.26), transparent 46%),
    var(--panel);
  box-shadow: 0 0 28px rgba(190, 242, 100, 0.14);
}

.brand-mark::before {
  width: 8px;
  height: 8px;
  border: 1px solid rgba(6, 182, 212, 0.86);
  border-radius: 50%;
  background: var(--lime);
  box-shadow:
    0 0 18px rgba(190, 242, 100, 0.48),
    0 0 28px rgba(6, 182, 212, 0.22);
  content: "";
}

.brand-mark::after {
  position: absolute;
  left: 14px;
  top: 6px;
  width: 1px;
  height: 7px;
  background: rgba(243, 244, 246, 0.34);
  content: "";
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  color: var(--muted);
  font-family: "SFMono-Regular", "Cascadia Code", "JetBrains Mono", monospace;
  font-size: 12px;
  font-weight: 800;
}

.nav-links a,
.nav-cta,
.button {
  transition:
    transform 160ms ease-out,
    background-color 160ms ease-out,
    border-color 160ms ease-out,
    color 160ms ease-out,
    filter 160ms ease-out;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--cyan);
}

.nav-cta {
  justify-self: end;
  min-height: 44px;
  border: 1px solid rgba(190, 242, 100, 0.55);
  background: rgba(190, 242, 100, 0.1);
  padding: var(--space-3) var(--space-5);
  color: var(--lime);
  font-family: "SFMono-Regular", "Cascadia Code", "JetBrains Mono", monospace;
  font-size: 12px;
  font-weight: 850;
  white-space: nowrap;
}

.nav-cta:hover,
.nav-cta:focus-visible {
  background: var(--lime);
  color: var(--black);
  transform: translateY(-2px);
}

a:focus-visible,
button:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}

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

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--hair);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(120deg, transparent 0 36%, rgba(6, 182, 212, 0.12) 36.1% 36.4%, transparent 36.5%),
    linear-gradient(62deg, transparent 0 52%, rgba(190, 242, 100, 0.12) 52.1% 52.4%, transparent 52.5%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(420px, 1.14fr);
  align-items: center;
  gap: clamp(var(--space-10), 6vw, var(--space-20));
  min-height: calc(100dvh - var(--nav-height));
  padding-block: var(--space-20);
}

.eyebrow,
.section-kicker,
.signal-inner,
.runtime-stack span,
.visual-card span,
.poc-flow span,
.button {
  font-family: "SFMono-Regular", "Cascadia Code", "JetBrains Mono", monospace;
}

.eyebrow,
.section-kicker {
  display: inline-flex;
  width: fit-content;
  margin-bottom: var(--space-5);
  border: 1px solid rgba(6, 182, 212, 0.5);
  background: rgba(6, 182, 212, 0.09);
  padding: var(--space-2) var(--space-3);
  color: var(--cyan);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.02em;
}

h1 {
  max-width: 12ch;
  margin-bottom: var(--space-6);
  font-family: "Space Grotesk", "Pretendard Variable", Pretendard, sans-serif;
  font-size: clamp(46px, 7.2vw, 112px);
  font-weight: 900;
  line-height: 0.94;
  text-wrap: balance;
  word-break: keep-all;
}

h2 {
  margin-bottom: var(--space-5);
  font-family: "Space Grotesk", "Pretendard Variable", Pretendard, sans-serif;
  font-size: clamp(32px, 4.4vw, 64px);
  font-weight: 880;
  line-height: 1.04;
  text-wrap: balance;
  word-break: keep-all;
}

h3 {
  margin-bottom: var(--space-3);
  font-size: 22px;
  font-weight: 820;
  line-height: 1.25;
  word-break: keep-all;
}

.hero-lead,
.split-head p,
.runtime-copy p,
.visual-head p,
.audience-grid p,
.contact-panel p {
  max-width: 650px;
  color: var(--muted);
  font-size: 18px;
  font-weight: 540;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  border: 1px solid var(--hair);
  padding: var(--space-3) var(--space-6);
  font-size: 13px;
  font-weight: 850;
  line-height: 1;
  white-space: nowrap;
}

.button-primary {
  border-color: rgba(190, 242, 100, 0.74);
  background: var(--lime);
  color: var(--black);
  box-shadow: var(--glow-lime);
}

.button-secondary {
  background: rgba(255, 255, 255, 0.045);
  color: var(--text);
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.button-primary:hover,
.button-primary:focus-visible {
  filter: brightness(1.08);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  border-color: rgba(6, 182, 212, 0.62);
  color: var(--cyan);
}

.button:active,
.nav-cta:active {
  transform: translateY(0);
}

.hero-visual {
  position: relative;
  margin: 0;
}

.hero-visual::before {
  position: absolute;
  inset: 8% 8% auto auto;
  width: 42%;
  height: 42%;
  background: rgba(6, 182, 212, 0.14);
  filter: blur(58px);
  content: "";
}

.hero-visual img {
  position: relative;
  width: 100%;
  border: 1px solid var(--hair);
  background: var(--panel);
  box-shadow: var(--shadow-panel), var(--glow-cyan);
}

.signal-strip {
  border-bottom: 1px solid var(--hair);
  background: rgba(12, 13, 16, 0.86);
}

.signal-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.signal-inner span,
.signal-inner strong {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 96px;
  border-left: 1px solid var(--hair);
  color: var(--muted);
  font-size: 12px;
  font-weight: 820;
  text-align: center;
}

.signal-inner strong {
  border-right: 1px solid var(--hair);
  color: var(--lime);
}

.problem-section {
  padding-block: var(--space-24);
}

.split-head,
.runtime-grid,
.visual-head,
.audience-grid,
.contact-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: clamp(var(--space-8), 5vw, var(--space-16));
  align-items: start;
}

.split-head h2,
.audience-grid h2 {
  margin-bottom: 0;
}

.runtime-section {
  border-block: 1px solid var(--hair);
  background:
    radial-gradient(circle at 18% 0%, rgba(190, 242, 100, 0.1), transparent 28rem),
    var(--panel);
  padding-block: var(--space-24);
}

.runtime-stack {
  display: grid;
  gap: var(--space-4);
}

.runtime-stack article {
  position: relative;
  display: grid;
  grid-template-columns: 54px minmax(0, 0.36fr) minmax(0, 1fr);
  gap: var(--space-5);
  align-items: start;
  border: 1px solid var(--hair);
  background: rgba(255, 255, 255, 0.035);
  padding: var(--space-6);
}

.runtime-stack article::before {
  position: absolute;
  left: -1px;
  top: -1px;
  width: 4px;
  height: calc(100% + 2px);
  background: var(--cyan);
  content: "";
}

.runtime-stack article:nth-child(2)::before {
  background: var(--pink);
}

.runtime-stack article:nth-child(3)::before {
  background: var(--lime);
}

.runtime-stack span,
.visual-card span,
.poc-flow span {
  color: var(--cyan);
  font-size: 12px;
  font-weight: 850;
}

.runtime-stack p,
.visual-card p,
.poc-flow p {
  margin-bottom: 0;
  color: var(--muted);
}

.visual-section {
  padding-block: var(--space-24);
}

.visual-head {
  margin-bottom: var(--space-12);
}

.visual-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: var(--space-5);
}

.visual-card {
  display: grid;
  border: 1px solid var(--hair);
  background: rgba(255, 255, 255, 0.04);
  box-shadow: var(--shadow-panel);
}

.visual-card img {
  width: 100%;
  border-bottom: 1px solid var(--hair);
  background: var(--panel);
}

.visual-card div {
  padding: var(--space-6);
}

.visual-card h3 {
  max-width: 670px;
  margin: var(--space-3) 0 0;
}

.visual-card-wide {
  grid-row: span 2;
}

.audience-section {
  border-block: 1px solid var(--hair);
  background: var(--paper);
  color: var(--black);
  padding-block: var(--space-20);
}

.audience-section .section-kicker {
  border-color: rgba(5, 5, 5, 0.18);
  background: var(--black);
  color: var(--lime);
}

.audience-grid p {
  margin-bottom: 0;
  color: rgba(5, 5, 5, 0.72);
  font-weight: 600;
}

.poc-section {
  padding-block: var(--space-24);
}

.poc-panel {
  border: 1px solid var(--hair);
  background:
    linear-gradient(90deg, rgba(6, 182, 212, 0.13), transparent 38%),
    var(--panel);
  padding: clamp(var(--space-6), 5vw, var(--space-12));
  box-shadow: var(--shadow-panel);
}

.poc-flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin: var(--space-10) 0 0;
  padding: 0;
  list-style: none;
}

.poc-flow li {
  min-height: 210px;
  border: 1px solid var(--hair);
  background: rgba(255, 255, 255, 0.045);
  padding: var(--space-6);
}

.poc-flow strong {
  display: block;
  margin-block: var(--space-8) var(--space-3);
  font-size: 20px;
}

.contact-section {
  padding-block: 0 var(--space-16);
}

.contact-panel {
  align-items: center;
  border: 1px solid rgba(190, 242, 100, 0.36);
  background:
    radial-gradient(circle at 82% 16%, rgba(190, 242, 100, 0.16), transparent 18rem),
    var(--raised);
  padding: clamp(var(--space-6), 5vw, var(--space-12));
  box-shadow: var(--glow-lime);
}

.contact-panel h2 {
  font-size: clamp(32px, 4.2vw, 58px);
}

.contact-panel p {
  margin-bottom: 0;
}

.site-footer {
  border-top: 1px solid var(--hair);
  background: var(--black);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  min-height: 92px;
  color: var(--muted);
}

.footer-inner p {
  margin-bottom: 0;
  font-family: "SFMono-Regular", "Cascadia Code", "JetBrains Mono", monospace;
  font-size: 12px;
}

@media (max-width: 920px) {
  .nav-shell {
    grid-template-columns: 1fr auto;
  }

  .nav-links {
    display: none;
  }

  .hero-inner,
  .split-head,
  .runtime-grid,
  .visual-head,
  .audience-grid,
  .contact-panel {
    grid-template-columns: 1fr;
  }

  .hero-inner {
    min-height: auto;
  }

  .hero-copy {
    max-width: 760px;
  }

  .signal-inner,
  .poc-flow {
    grid-template-columns: repeat(2, 1fr);
  }

  .visual-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .section-wrap {
    width: min(calc(100% - 28px), var(--max));
  }

  .site-header {
    position: static;
  }

  .nav-shell {
    min-height: 64px;
  }

  .nav-cta {
    padding-inline: var(--space-3);
  }

  .hero-inner {
    gap: var(--space-8);
    padding-block: var(--space-12);
  }

  h1 {
    max-width: 11ch;
    font-size: clamp(42px, 13vw, 64px);
  }

  h2 {
    font-size: clamp(30px, 9vw, 46px);
  }

  .hero-lead,
  .split-head p,
  .runtime-copy p,
  .visual-head p,
  .audience-grid p,
  .contact-panel p {
    font-size: 16px;
  }

  .hero-actions,
  .hero-actions .button,
  .contact-panel .button {
    width: 100%;
  }

  .signal-inner,
  .poc-flow {
    grid-template-columns: 1fr;
  }

  .signal-inner span,
  .signal-inner strong {
    min-height: 64px;
    border-right: 1px solid var(--hair);
  }

  .problem-section,
  .runtime-section,
  .visual-section,
  .poc-section {
    padding-block: var(--space-16);
  }

  .runtime-stack article {
    grid-template-columns: 1fr;
  }

  .poc-flow li {
    min-height: 160px;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}