:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", system-ui, sans-serif;
  --font-mono: "SFMono-Regular", "Cascadia Code", "Menlo", "Consolas", ui-monospace, monospace;
  --black: #050505;
  --panel: #0c0d10;
  --raised: #12151b;
  --paper: #f3f4f6;
  --white: #ffffff;
  --text: #f3f4f6;
  --muted: rgba(243, 244, 246, 0.68);
  --hair: rgba(255, 255, 255, 0.12);
  --cyan: #06b6d4;
  --lime: #bef264;
  --pink: #f472b6;
  --orange: #f59e0b;
  --glow-cyan: 0 0 34px rgba(6, 182, 212, 0.14);
  --glow-lime: 0 0 32px rgba(190, 242, 100, 0.13);
  --shadow-panel: 0 30px 90px rgba(0, 0, 0, 0.36);
  --focus: 0 0 0 4px rgba(6, 182, 212, 0.32);
  --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;
}

section[id] {
  scroll-margin-top: calc(var(--nav-height) + var(--space-6));
}

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: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  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: var(--font-sans);
  font-size: 15px;
  font-weight: 750;
  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: rgba(243, 244, 246, 0.88);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.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: var(--font-sans);
  font-size: 13px;
  font-weight: 700;
  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:
    radial-gradient(circle at 72% 42%, rgba(6, 182, 212, 0.08), transparent 24rem),
    radial-gradient(circle at 48% 68%, rgba(190, 242, 100, 0.045), transparent 18rem);
  pointer-events: none;
}

.hero-grid::after {
  position: absolute;
  inset: 12% 18% auto auto;
  width: 26%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(6, 182, 212, 0.16), transparent);
  content: "";
}

.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-16);
}

.eyebrow,
.section-kicker,
.signal-inner,
.runtime-stack span,
.visual-card span,
.poc-flow span {
  font-family: var(--font-sans);
}

.request-flow span {
  font-family: var(--font-mono);
}

.button {
  font-family: var(--font-sans);
}

.eyebrow,
.section-kicker {
  display: inline-flex;
  width: fit-content;
  margin-bottom: var(--space-5);
  border: 1px solid rgba(6, 182, 212, 0.32);
  background: rgba(6, 182, 212, 0.06);
  padding: var(--space-2) var(--space-3);
  color: rgba(103, 232, 249, 0.86);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0;
}

h1 {
  max-width: 13.5ch;
  margin-bottom: var(--space-6);
  font-family: var(--font-sans);
  font-size: clamp(38px, 3.8vw, 56px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
  text-wrap: balance;
  word-break: keep-all;
}

h2 {
  margin-bottom: var(--space-5);
  font-family: var(--font-sans);
  font-size: clamp(27px, 2.8vw, 38px);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.015em;
  text-wrap: balance;
  word-break: keep-all;
}

h3 {
  margin-bottom: var(--space-3);
  font-size: 19px;
  font-weight: 700;
  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: 680px;
  color: var(--muted);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.72;
}

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

.hero-proof {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: var(--space-5) 0 0;
  padding: 0;
  list-style: none;
}

.hero-proof li {
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.04);
  padding: var(--space-2) var(--space-3);
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 650;
}

.button {
  position: relative;
  overflow: hidden;
  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: 700;
  line-height: 1;
  white-space: nowrap;
}

.button::after {
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, transparent 0 42%, rgba(255, 255, 255, 0.38) 48%, transparent 56%);
  transform: translateX(-120%);
  transition: transform 420ms ease-out;
  content: "";
  pointer-events: none;
}

.button:hover::after,
.button:focus-visible::after {
  transform: translateX(120%);
}

.button-primary {
  border-color: rgba(190, 242, 100, 0.74);
  background: var(--lime);
  color: var(--black);
  box-shadow: 0 14px 34px rgba(190, 242, 100, 0.13);
}

.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), 0 0 34px rgba(6, 182, 212, 0.14);
  transition: transform 260ms ease-out, border-color 260ms ease-out, box-shadow 260ms ease-out;
}

@media (hover: hover) {
  .hero-visual:hover img {
    border-color: rgba(6, 182, 212, 0.28);
    box-shadow: var(--shadow-panel), 0 0 42px rgba(6, 182, 212, 0.16);
    transform: translateY(-3px);
  }
}

.request-flow {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-2);
  margin: 0 0 var(--space-3);
  padding: var(--space-3);
  border: 1px solid rgba(6, 182, 212, 0.22);
  background: rgba(5, 5, 5, 0.7);
  box-shadow: 0 18px 54px rgba(6, 182, 212, 0.12);
  list-style: none;
}

.request-flow li {
  --flow-accent: var(--cyan);
  position: relative;
  overflow: hidden;
  display: grid;
  gap: var(--space-2);
  min-height: 72px;
  align-content: center;
  border: 1px solid rgba(255, 255, 255, 0.11);
  background: rgba(12, 13, 16, 0.9);
  padding: var(--space-3);
  animation: flow-card-focus 8s ease-in-out infinite;
}

.request-flow li::after {
  position: absolute;
  inset: auto 0 0;
  height: 2px;
  background: var(--flow-accent);
  opacity: 0;
  transform: scaleX(0.22);
  transform-origin: left;
  animation: flow-card-edge 8s ease-in-out infinite;
  content: "";
}

.request-flow li:nth-child(2) {
  animation-delay: 2s;
}

.request-flow li:nth-child(2)::after {
  animation-delay: 2s;
}

.request-flow li:nth-child(3) {
  --flow-accent: var(--orange);
  animation-delay: 4s;
}

.request-flow li:nth-child(3)::after {
  animation-delay: 4s;
}

.request-flow li:nth-child(4) {
  --flow-accent: var(--lime);
  animation-delay: 6s;
}

.request-flow li:nth-child(4)::after {
  animation-delay: 6s;
}

.request-flow span {
  display: grid;
  width: 22px;
  height: 22px;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--flow-accent) 58%, transparent);
  color: var(--flow-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
}

.request-flow strong {
  color: var(--text);
  font-size: 12px;
  line-height: 1.4;
  word-break: keep-all;
}

.hero-visual figcaption,
.visual-card p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

.hero-visual figcaption {
  margin-top: var(--space-3);
}

.signal-strip {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--hair);
  background: rgba(12, 13, 16, 0.72);
}

.signal-strip::before {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(190, 242, 100, 0.08), transparent);
  transform: translateX(-100%);
  content: "";
  pointer-events: none;
}

.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: 60px;
  border-left: 1px solid rgba(255, 255, 255, 0.08);
  color: rgba(243, 244, 246, 0.86);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-align: center;
}

.signal-inner strong {
  border-right: 1px solid var(--hair);
  color: rgba(190, 242, 100, 0.96);
}

.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);
}

.difference-list {
  display: grid;
  gap: var(--space-3);
  margin: var(--space-6) 0 0;
  padding: 0;
  list-style: none;
}

.difference-list li {
  border-left: 3px solid var(--cyan);
  background: rgba(255, 255, 255, 0.035);
  padding: var(--space-3) var(--space-4);
  color: var(--muted);
}

.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);
  box-shadow: 0 0 18px rgba(6, 182, 212, 0.28);
  content: "";
}

.runtime-stack article:nth-child(2)::before {
  background: var(--pink);
  box-shadow: 0 0 18px rgba(244, 114, 182, 0.24);
}

.runtime-stack article:nth-child(3)::before {
  background: var(--lime);
  box-shadow: 0 0 18px rgba(190, 242, 100, 0.24);
}

.runtime-stack span,
.visual-card span,
.poc-flow span {
  color: var(--cyan);
  font-size: 12px;
  font-weight: 700;
}

.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);
  transition:
    transform 200ms ease-out,
    border-color 200ms ease-out,
    box-shadow 200ms ease-out;
}

.visual-card:hover {
  border-color: rgba(6, 182, 212, 0.4);
  box-shadow: var(--shadow-panel), 0 0 34px rgba(6, 182, 212, 0.14);
  transform: translateY(-4px);
}

.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 var(--space-2);
}

.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(4, 1fr);
  gap: var(--space-4);
  margin: var(--space-10) 0 0;
  padding: 0;
  list-style: none;
}

.poc-flow li {
  min-height: 190px;
  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: 0 14px 34px rgba(190, 242, 100, 0.13);
}

.contact-panel h2 {
  font-size: clamp(30px, 3.7vw, 48px);
}

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

.contact-panel .button {
  justify-self: end;
  width: max-content;
}

.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: var(--font-mono);
  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 {
    grid-template-columns: repeat(2, 1fr);
  }

  .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: 50px;
  }

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

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

  .hero-visual {
    animation: none;
  }

  .hero-grid::after,
  .signal-strip::before,
  .request-flow li::after {
    display: none;
  }

  h1 {
    max-width: 11ch;
    font-size: clamp(36px, 9vw, 48px);
  }

  .request-flow {
    grid-template-columns: 1fr 1fr;
  }

  .request-flow li {
    animation: none;
  }

  h2 {
    font-size: clamp(29px, 8vw, 42px);
  }

  .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: 50px;
    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;
  }
}

@keyframes flow-card-focus {
  0%,
  18%,
  100% {
    border-color: rgba(255, 255, 255, 0.11);
    background: rgba(12, 13, 16, 0.9);
    box-shadow: none;
  }

  6%,
  12% {
    border-color: color-mix(in srgb, var(--flow-accent) 42%, rgba(255, 255, 255, 0.11));
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.01)), rgba(12, 13, 16, 0.9);
    box-shadow: inset 0 -2px 0 var(--flow-accent), 0 0 22px color-mix(in srgb, var(--flow-accent) 12%, transparent);
  }
}

@keyframes flow-card-edge {
  0%,
  18%,
  100% {
    opacity: 0;
    transform: scaleX(0.22);
  }

  6%,
  12% {
    opacity: 0.72;
    transform: scaleX(1);
  }
}

@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;
  }

  .hero-grid::after,
  .signal-strip::before,
  .request-flow li::after {
    display: none;
  }
}