:root {
  --color-bg: #0b0b0d;
  --color-bg-soft: #111114;
  --color-card: #17171b;
  --color-card-hover: #1c1c21;
  --color-text: #f4f4f5;
  --color-muted: #9b9ba5;
  --color-border: rgba(255, 255, 255, 0.1);
  --color-border-hover: rgba(255, 255, 255, 0.18);
  --color-accent: #7c8cff;
  --color-accent-soft: rgba(124, 140, 255, 0.12);
  --content-width: 1100px;
  --page-padding: clamp(1.25rem, 4vw, 2.5rem);
  --radius-large: 1.25rem;
  --radius-small: 0.65rem;
  --transition: 180ms ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
  scroll-padding-top: 6rem;
}

body {
  min-width: 0;
  margin: 0;
  overflow-x: clip;
  background:
    radial-gradient(circle at 78% 8%, rgba(124, 140, 255, 0.08), transparent 28rem),
    var(--color-bg);
  color: var(--color-text);
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "Noto Sans KR",
    sans-serif;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;

  transition:
    opacity 500ms ease,
    filter 500ms ease,
    transform 500ms ease;
}

body.is-leaving {
  opacity: 0;
  filter: blur(8px);
  transform: scale(1.02);
  pointer-events: none;
}

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

button {
  font: inherit;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 4px;
}

.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  border-bottom: 1px solid var(--color-border);
  background: rgba(11, 11, 13, 0.76);
  backdrop-filter: blur(16px);
  transition: background-color var(--transition);
}

.site-header:hover,
.site-header:focus-within {
  background: rgba(11, 11, 13, 0.92);
}

.header-inner,
.hero,
.content-section,
.footer-inner {
  width: min(100%, calc(var(--content-width) + (var(--page-padding) * 2)));
  margin-inline: auto;
  padding-inline: var(--page-padding);
}

.header-inner {
  display: flex;
  min-height: 4.5rem;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand {
  color: var(--color-text);
  font-size: 1rem;
  font-weight: 750;
  letter-spacing: -0.02em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 3vw, 2.25rem);
}

.site-nav a {
  color: var(--color-muted);
  font-size: 0.9rem;
  font-weight: 600;
  transition: color var(--transition);
}

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

.hero {
  display: grid;
  min-height: 35rem;
  align-items: center;
  padding-block: clamp(7rem, 14vw, 11rem) clamp(6rem, 11vw, 9rem);
}

.hero-content {
  position: relative;
  max-width: 52rem;
  animation: hero-enter 600ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.hero-content::before {
  position: absolute;
  top: -2rem;
  left: 0;
  width: 3.5rem;
  height: 2px;
  background: var(--color-accent);
  content: "";
}

.hero h1 {
  margin: 0;
  font-size: clamp(3.7rem, 10vw, 7.5rem);
  font-weight: 780;
  letter-spacing: -0.075em;
  line-height: 0.95;
}

.hero-summary {
  margin: clamp(2rem, 4vw, 2.75rem) 0 0;
  color: var(--color-text);
  font-size: clamp(1.15rem, 2.4vw, 1.55rem);
  letter-spacing: -0.02em;
  line-height: 1.45;
}

.hero-description {
  max-width: 38rem;
  margin: 0.7rem 0 0;
  color: var(--color-muted);
  font-size: clamp(0.95rem, 1.7vw, 1.05rem);
  word-break: keep-all;
}

.explore-link {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  margin-top: 2.5rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.7rem 1rem 0.7rem 1.1rem;
  background: rgba(255, 255, 255, 0.025);
  color: var(--color-text);
  font-size: 0.85rem;
  font-weight: 650;
  transition:
    border-color var(--transition),
    background-color var(--transition);
}

.explore-link span {
  color: var(--color-accent);
  transition: transform var(--transition);
}

.explore-link:hover {
  border-color: var(--color-border-hover);
  background: rgba(255, 255, 255, 0.055);
}

.explore-link:hover span {
  transform: translateY(3px);
}

.content-section {
  padding-block: clamp(4.5rem, 9vw, 7rem);
  scroll-margin-top: 4rem;
}

.section-heading {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.section-heading h2 {
  flex: none;
  margin: 0;
  font-size: clamp(1.65rem, 3vw, 2.15rem);
  letter-spacing: -0.04em;
  line-height: 1.2;
}

.section-heading > span {
  width: 100%;
  height: 1px;
  background: var(--color-border);
}

.services-grid,
.projects-grid {
  display: grid;
  gap: 1rem;
}

.services-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.card {
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-large);
  background: var(--color-card);
}

.service-card {
  display: flex;
  min-height: 18rem;
  flex-direction: column;
  align-items: stretch;
  padding: 1.5rem;
  color: var(--color-text);
  text-align: left;
  transition:
    transform var(--transition),
    border-color var(--transition),
    background-color var(--transition);
}

button.service-card {
  width: 100%;
  appearance: none;
  cursor: pointer;
}

.service-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
  background: var(--color-card-hover);
}

.card-index {
  align-self: flex-end;
  color: #777782;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.service-card h3,
.project-card h3 {
  margin: 0;
  font-size: 1.2rem;
  letter-spacing: -0.025em;
  line-height: 1.35;
}

.service-card h3 {
  margin-top: 2.6rem;
}

.service-card p,
.project-card p {
  color: var(--color-muted);
  word-break: keep-all;
}

.service-card p {
  margin: 0.7rem 0 2rem;
  font-size: 0.94rem;
}

.card-address {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: auto;
  border-top: 1px solid var(--color-border);
  padding-top: 1rem;
  color: #c9c9cf;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.8rem;
  overflow-wrap: anywhere;
}

.card-arrow {
  flex: none;
  color: var(--color-accent);
  font-family: inherit;
  font-size: 1rem;
  transition: transform var(--transition);
}

.service-card:hover .card-arrow {
  transform: translate(2px, -2px);
}

.copy-label {
  flex: none;
  border-radius: 999px;
  padding: 0.2rem 0.55rem;
  background: var(--color-accent-soft);
  color: #aeb8ff;
  font-family: inherit;
  font-size: 0.7rem;
  font-weight: 700;
}

.building-section {
  padding-bottom: clamp(6rem, 12vw, 9rem);
}

.project-card {
  min-height: 12rem;
  padding: clamp(1.4rem, 3vw, 2rem);
  background: var(--color-bg-soft);
}

.project-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.project-card p {
  max-width: 28rem;
  margin: 2rem 0 0;
  font-size: 0.94rem;
}

.status {
  flex: none;
  border: 1px solid rgba(124, 140, 255, 0.28);
  border-radius: 999px;
  padding: 0.25rem 0.65rem;
  background: var(--color-accent-soft);
  color: #b6beff;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.5;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-soft);
}

.footer-inner {
  display: flex;
  min-height: 8.5rem;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.footer-inner strong {
  font-size: 0.95rem;
  letter-spacing: -0.02em;
}

.footer-inner p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.85rem;
}

.footer-link {
  color: var(--color-text);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.footer-link:visited {
  color: var(--color-text);
}

.footer-link:hover {
  color: var(--color-accent);
}

.footer-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: 4px;
}

.secret-dot {
  display: inline-block;
  cursor: pointer;
  user-select: none;
}

.toast {
  position: fixed;
  z-index: 20;
  right: max(1rem, env(safe-area-inset-right));
  bottom: max(1rem, env(safe-area-inset-bottom));
  max-width: calc(100vw - 2rem);
  transform: translateY(0.75rem);
  border: 1px solid var(--color-border-hover);
  border-radius: var(--radius-small);
  padding: 0.75rem 1rem;
  background: #232329;
  box-shadow: 0 0.75rem 2.5rem rgba(0, 0, 0, 0.35);
  color: var(--color-text);
  font-size: 0.85rem;
  opacity: 0;
  pointer-events: none;
  transition:
    opacity var(--transition),
    transform var(--transition);
}

.toast.is-visible {
  transform: translateY(0);
  opacity: 1;
}

.secret-toast {
  position: fixed;
  left: 50%;
  bottom: 2rem;
  z-index: 1000;

  max-width: calc(100vw - 2rem);
  padding: 0.8rem 1.1rem;

  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 0.75rem;

  background: rgba(18, 18, 22, 0.94);
  color: var(--color-text, #f4f4f5);

  font-size: 0.95rem;
  text-align: center;
  white-space: nowrap;

  opacity: 0;
  pointer-events: none;

  transform: translate(-50%, 0.7rem);
  transition:
    opacity 160ms ease,
    transform 160ms ease;
}

.secret-toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.age-modal[hidden] {
  display: none;
}

.age-modal {
  position: fixed;
  inset: 0;
  z-index: 9999;

  display: flex;
  align-items: center;
  justify-content: center;

  padding: 1.5rem;

  opacity: 0;
  pointer-events: none;

  transition: opacity 220ms ease;
}

.age-modal.is-open {
  opacity: 1;
  pointer-events: auto;
}

.age-modal-backdrop {
  position: absolute;
  inset: 0;

  background: rgba(0, 0, 0, 0.78);
  backdrop-filter: blur(0);

  transition:
    background 220ms ease,
    backdrop-filter 220ms ease;
}

.age-modal.is-open .age-modal-backdrop {
  background: rgba(0, 0, 0, 0.78);
  backdrop-filter: blur(8px);
}

.age-modal-content {
  position: relative;
  z-index: 1;

  width: min(100%, 28rem);
  padding: 2rem;

  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 1rem;

  background: #17171b;
  color: #f4f4f5;
  text-align: center;

  opacity: 0;
  transform: translateY(18px) scale(0.96);

  transition:
    opacity 220ms ease,
    transform 220ms ease;
}

.age-modal.is-open .age-modal-content {
  opacity: 1;
  transform: translateY(0) scale(1);
}

@keyframes hero-enter {
  from {
    transform: translateY(18px);
    opacity: 0;
  }

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

@media (max-width: 56rem) {
  .services-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 40rem) {
  :root {
    --page-padding: 1rem;
  }

  .header-inner {
    min-height: 4rem;
    gap: 1rem;
  }

  .site-nav {
    gap: 0.75rem;
  }

  .site-nav a {
    font-size: 0.76rem;
  }

  .hero {
    min-height: 30rem;
    padding-block: 7.5rem 5.5rem;
  }

  .hero h1 {
    font-size: clamp(2.9rem, 15vw, 3.6rem);
    letter-spacing: -0.065em;
  }

  .services-grid,
  .projects-grid {
    grid-template-columns: 1fr;
  }

  .service-card {
    min-height: 16rem;
  }

  .project-card-header,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .project-card-header {
    gap: 0.75rem;
  }

  .project-card p {
    margin-top: 1.5rem;
  }

  .footer-inner {
    min-height: auto;
    justify-content: center;
    gap: 0.25rem;
    padding-block: 2rem;
  }
}

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

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

  .service-card:hover,
  .explore-link:hover span,
  .service-card:hover .card-arrow {
    transform: none;
  }
}