* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Pretendard", "Noto Sans KR", Arial, sans-serif;
  color: #0b1830;
  background: #fff;
  line-height: 1.6;
}

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

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

.container {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(5, 22, 45, 0.96);
  backdrop-filter: blur(10px);
}

.header-inner {
  height: 86px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand img {
  height: 54px;
  width: auto;
}

.brand-text {
  color: #fff;
  font-size: 32px;
  font-weight: 900;
  letter-spacing: -1px;
}

.nav {
  display: flex;
  gap: 44px;
}

.nav a {
  color: #fff;
  font-size: 16px;
  font-weight: 700;
}

.hero {
  min-height: 720px;
  background: url("assets/hero.jpg") center / cover no-repeat;
}

.hero-overlay {
  min-height: 720px;
  background: linear-gradient(90deg, rgba(5, 22, 45, 0.88) 0%, rgba(5, 22, 45, 0.62) 43%, rgba(5, 22, 45, 0.08) 100%);
  display: flex;
  align-items: center;
}

.hero-content {
  color: #fff;
}

.eyebrow,
.section-kicker {
  margin: 0 0 12px;
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: #4774ad;
}

.hero h1 {
  margin: 0;
  font-size: clamp(44px, 6vw, 78px);
  line-height: 1.08;
  letter-spacing: -0.06em;
}

.hero-desc {
  margin: 24px 0 0;
  font-size: clamp(18px, 2vw, 24px);
  font-weight: 700;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 38px;
}

.btn {
  min-width: 160px;
  padding: 15px 26px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  font-weight: 800;
  text-align: center;
}

.btn.primary {
  color: #fff;
}

.btn.secondary {
  color: #071a34;
  background: #fff;
  border-color: #fff;
}

.section {
  padding: 86px 0;
}

.split {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 60px;
  align-items: center;
}

h2 {
  margin: 0;
  font-size: clamp(32px, 4vw, 44px);
  line-height: 1.25;
  letter-spacing: -0.04em;
  color: #071a34;
}

.about p:last-child {
  margin: 0;
  color: #34465f;
  font-size: 18px;
}

.center {
  text-align: center;
}

.business {
  background: #f5f7fb;
}

.business-grid {
  margin-top: 38px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.business-grid article {
  background: #fff;
  border: 1px solid #dce3ec;
  padding: 32px;
  min-height: 180px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.business-grid article:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(7, 26, 52, 0.1);
}

.business-grid span {
  color: #9badc5;
  font-weight: 900;
}

.business-grid h3 {
  margin: 16px 0 10px;
  font-size: 22px;
  color: #071a34;
}

.business-grid p {
  margin: 0;
  color: #52657d;
}

.projects {
  padding: 72px 0;
  background: #071a34;
  color: #fff;
}

.project-wrap {
  display: grid;
  grid-template-columns: 0.25fr 0.75fr;
  gap: 34px;
  align-items: center;
}

.project-title h2 {
  color: #fff;
}

.project-title p:last-child {
  color: #ccd6e5;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.project-card {
  position: relative;
  overflow: hidden;
  background: #000;
}

.project-card img {
  width: 100%;
  height: 210px;
  object-fit: cover;
  opacity: 0.92;
  transition: transform 0.25s ease;
}

.project-card:hover img {
  transform: scale(1.04);
}

.project-card h3 {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 18px 14px;
  background: linear-gradient(180deg, rgba(7, 26, 52, 0), rgba(7, 26, 52, 0.9));
  font-size: 17px;
  text-align: center;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.7fr 0.8fr 1.2fr;
  gap: 30px;
  align-items: center;
}

.contact-item {
  border-left: 1px solid #d7dee8;
  padding-left: 28px;
}

.contact-item strong {
  display: block;
  margin-bottom: 8px;
  color: #071a34;
}

.contact-item a,
.contact-item span {
  color: #233a59;
  font-size: 18px;
  font-weight: 700;
}

footer {
  background: #05162d;
  color: #dbe4f0;
  padding: 26px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-size: 14px;
}

@media (max-width: 980px) {
  .nav {
    gap: 20px;
  }

  .split,
  .project-wrap,
  .contact-grid {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 640px) {
  .header-inner {
    height: auto;
    padding: 18px 0;
    align-items: flex-start;
    gap: 16px;
    flex-direction: column;
  }

  .nav {
    width: 100%;
    flex-wrap: wrap;
    gap: 12px 18px;
  }

  .hero,
  .hero-overlay {
    min-height: 620px;
  }

  .hero-actions {
    flex-direction: column;
    max-width: 280px;
  }

  .business-grid,
  .project-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 64px 0;
  }

  .footer-inner {
    flex-direction: column;
  }
}