:root {
  color-scheme: light;
  --navy: #10243e;
  --navy-deep: #0b1d31;
  --teal: #2a7b76;
  --stone: #eeeae2;
  --paper: #faf8f4;
  --ink: #13202b;
  --line: #a9bec1;
  font-family: Pretendard, "Noto Sans KR", "Apple SD Gothic Neo", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
}

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

.skip-link {
  position: fixed;
  z-index: 20;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  color: white;
  background: var(--teal);
  transform: translateY(-180%);
}

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

.site-header {
  min-height: 94px;
  padding: 0 clamp(24px, 4.5vw, 72px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: white;
  background: var(--navy-deep);
}

.brand {
  font-size: clamp(1.55rem, 2.2vw, 2.15rem);
  font-weight: 800;
  letter-spacing: -0.06em;
}

nav {
  display: flex;
  gap: clamp(22px, 4vw, 58px);
  font-size: 1rem;
  font-weight: 650;
}

nav a,
.brand {
  outline-offset: 7px;
}

nav a:hover,
nav a:focus-visible {
  color: #9bd5d1;
}

.hero {
  min-height: 610px;
  padding: clamp(72px, 9vw, 128px) clamp(24px, 7.5vw, 120px);
  display: grid;
  grid-template-columns: minmax(430px, 0.9fr) minmax(460px, 1.1fr);
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero-copy {
  position: relative;
  z-index: 2;
}

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

h1 {
  margin-bottom: 28px;
  font-size: clamp(3.2rem, 5.4vw, 5.15rem);
  line-height: 1.12;
  letter-spacing: -0.065em;
}

.desktop-title {
  white-space: nowrap;
}

.mobile-title {
  display: none;
}

.hero-copy p {
  margin-bottom: 42px;
  font-size: clamp(1.05rem, 1.45vw, 1.35rem);
  letter-spacing: -0.025em;
}

.primary-link {
  min-width: 250px;
  min-height: 68px;
  padding: 0 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: white;
  background: var(--teal);
  font-size: 1.05rem;
  font-weight: 750;
  transition: background 160ms ease, transform 160ms ease;
}

.primary-link:hover,
.primary-link:focus-visible {
  background: #1f6662;
  transform: translateY(-2px);
}

.architecture {
  position: absolute;
  inset: 0 0 0 50%;
}

.guide-line {
  position: absolute;
  display: block;
  background: var(--line);
  opacity: 0.58;
}

.line-one {
  width: 1px;
  height: 74%;
  left: 58%;
  top: 0;
}

.line-two {
  width: 76%;
  height: 1px;
  right: 0;
  top: 29%;
}

.line-three {
  width: 57%;
  height: 1px;
  left: 2%;
  bottom: 19%;
}

.tower {
  position: absolute;
  bottom: 0;
  border: 1px solid var(--navy);
}

.tower-a {
  width: 14%;
  height: 43%;
  left: 38%;
  background: var(--teal);
}

.tower-b {
  width: 12%;
  height: 59%;
  left: 52%;
  background: var(--navy);
}

.tower-c {
  width: 27%;
  height: 34%;
  right: -2%;
  background: var(--navy-deep);
}

.roof {
  position: absolute;
  z-index: 2;
  width: 53%;
  height: 38%;
  right: -2%;
  top: 30%;
  background: var(--navy-deep);
  clip-path: polygon(0 0, 100% 72%, 100% 100%, 0 35%);
}

.survey-arc {
  position: absolute;
  width: 410px;
  height: 410px;
  right: -112px;
  top: 40px;
  border: 1px solid #7eafb1;
  border-radius: 50%;
}

.preparation {
  min-height: 258px;
  padding: 54px clamp(24px, 7.5vw, 120px);
  display: grid;
  grid-template-columns: 150px minmax(330px, 1fr) minmax(280px, 0.8fr);
  gap: 46px;
  align-items: center;
  background: var(--stone);
}

.plan-mark {
  width: 102px;
  height: 110px;
  position: relative;
  border-left: 1px solid var(--navy);
  border-bottom: 1px solid var(--navy);
}

.plan-mark::before {
  content: "";
  position: absolute;
  inset: 20px 0 auto 18px;
  height: 1px;
  background: var(--navy);
}

.plan-mark span {
  position: absolute;
  bottom: 0;
  width: 22px;
  border: 1px solid var(--navy);
  border-bottom: 0;
}

.plan-mark span:nth-child(1) { left: 22px; height: 42px; }
.plan-mark span:nth-child(2) { left: 44px; height: 76px; }
.plan-mark span:nth-child(3) { left: 66px; height: 31px; background: var(--teal); }

.preparation h2 {
  margin-bottom: 16px;
  font-size: clamp(1.85rem, 2.8vw, 2.65rem);
  line-height: 1.24;
  letter-spacing: -0.045em;
}

.preparation p,
.guide p {
  margin-bottom: 0;
  color: #43515a;
  font-size: 1.04rem;
}

.plan-grid {
  width: 100%;
  height: 145px;
  opacity: 0.5;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(90deg, transparent, black 30%);
}

.guide {
  padding: 86px clamp(24px, 7.5vw, 120px);
  border-bottom: 1px solid #d7d2c9;
}

.guide h2 {
  margin-bottom: 18px;
  font-size: 2rem;
  letter-spacing: -0.04em;
}

footer {
  padding: 32px clamp(24px, 7.5vw, 120px);
  display: flex;
  justify-content: space-between;
  color: #616a70;
  background: #f3f0ea;
  font-size: 0.92rem;
}

@media (max-width: 900px) {
  .site-header { min-height: 76px; }
  nav a:not(:last-child) { display: none; }
  .hero {
    min-height: 650px;
    grid-template-columns: 1fr;
    align-items: start;
  }
  .hero-copy { max-width: 620px; }
  .architecture {
    inset: 42% -18% 0 28%;
    opacity: 0.82;
  }
  .preparation {
    grid-template-columns: 88px 1fr;
    gap: 28px;
  }
  .plan-mark { transform: scale(0.75); transform-origin: left center; }
  .plan-grid { display: none; }
}

@media (max-width: 560px) {
  .site-header { padding-inline: 20px; }
  .hero { min-height: 620px; padding: 66px 20px 44px; }
  h1 { font-size: clamp(2.65rem, 13vw, 3.6rem); }
  .desktop-title { display: none; }
  .mobile-title { display: inline; }
  .primary-link { width: 100%; min-width: 0; }
  .architecture { inset: 56% -42% 0 2%; }
  .preparation {
    padding: 44px 20px;
    grid-template-columns: 1fr;
  }
  .plan-mark { display: none; }
  .guide { padding: 66px 20px; }
  footer { padding: 28px 20px; flex-direction: column; gap: 8px; }
}

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