/* ============ Tokens ============ */
:root {
  --navy-deep: #060D18;
  --navy: #0D1B2E;
  --navy-2: #0F2038;
  --cyan: #00D5D5;
  --blue: #0D67B2;
  --white: #FFFFFF;
  --ink: #0D1B2E;
  --body-dark: #45586E;
  --body-on-navy-1: #B9C8D7;
  --body-on-navy-2: #C3CED8;
  --body-on-navy-3: #D5DFE8;
  --muted: #869AAD;
  --line-light: rgba(13,27,46,0.09);
  --line-dark: rgba(255,255,255,0.12);
  --bg-light: #FFFFFF;
  --bg-light-2: #F7F9FB;
  --radius: 14px;
  --container: 1180px;
  --ff-body: "Noto Sans KR", "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--ff-body);
  color: var(--ink);
  background: var(--bg-light);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
h1, h2, h3 { margin: 0; font-weight: 800; letter-spacing: -0.01em; }
p { margin: 0; }
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
  position: relative;
}

/* ============ Eyebrow ============ */
.eyebrow {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 22px;
}
.eyebrow-dash {
  display: inline-block;
  width: 28px;
  height: 2px;
  background: var(--cyan);
}
.eyebrow-dash.dash-blue { background: var(--blue); }
.eyebrow-cyan { color: var(--cyan); }
.eyebrow-blue { color: var(--blue); }

.section-heading {
  font-size: clamp(28px, 3.6vw, 42px);
  line-height: 1.22;
  color: var(--ink);
  max-width: 800px;
}
.section-heading.light { color: var(--white); }
.section-heading .line { display: block; }

.section-sub {
  margin-top: 20px;
  font-size: 17px;
  line-height: 1.6;
  color: var(--body-dark);
  max-width: 640px;
}
.section-sub.light { color: var(--body-on-navy-1); }

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 26px;
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 700;
  white-space: nowrap;
  transition: transform .15s ease, background .2s ease, color .2s ease, border-color .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-light { background: var(--white); color: var(--navy); }
.btn-light:hover { background: var(--cyan); }
.btn-outline-light { border: 1.5px solid rgba(255,255,255,0.35); color: var(--white); }
.btn-outline-light:hover { border-color: var(--cyan); color: var(--cyan); }
.btn-cyan-outline {
  border: 1.5px solid var(--cyan);
  color: var(--cyan);
  padding: 10px 20px;
  font-size: 13.5px;
}
.btn-cyan-outline:hover { background: var(--cyan); color: var(--navy); }

/* ============ Nav ============ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(6, 13, 24, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255,255,255,0.07);
}
.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.nav-logo {
  font-size: 19px;
  font-weight: 800;
  color: var(--white);
  letter-spacing: 0.02em;
}
.nav-links {
  display: flex;
  gap: 34px;
  flex: 1;
  justify-content: center;
}
.nav-links a {
  color: rgba(255,255,255,0.82);
  font-size: 14px;
  font-weight: 500;
  transition: color .2s ease;
}
.nav-links a:hover { color: var(--cyan); }
.nav-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  color: rgba(255,255,255,0.55);
  letter-spacing: 0.03em;
  padding: 6px;
}
.lang-toggle .lang-sep { color: rgba(255,255,255,0.3); }
.lang-toggle .lang-opt { transition: color .2s ease; }
.lang-toggle[data-active="ko"] .lang-opt[data-lang="ko"],
.lang-toggle[data-active="en"] .lang-opt[data-lang="en"] {
  color: var(--cyan);
}
.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-burger span {
  width: 22px;
  height: 2px;
  background: var(--white);
  display: block;
}

/* ============ Hero ============ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  color: var(--white);
  overflow: hidden;
  background: var(--navy);
}
.hero-bg { position: absolute; inset: 0; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; }
.hero-overlay {
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(6,13,24,0.55) 0%, rgba(6,13,24,0.72) 45%, rgba(6,13,24,0.94) 100%),
    linear-gradient(90deg, rgba(6,13,24,0.55) 0%, rgba(6,13,24,0.2) 55%);
}
.hero-content {
  position: relative;
  padding-top: 150px;
  padding-bottom: 90px;
}
.hero h1 {
  font-size: clamp(34px, 5.4vw, 60px);
  line-height: 1.18;
  margin-bottom: 26px;
}
.hero h1 .line { display: block; }
.hero h1 .accent { color: var(--cyan); }
.hero-sub {
  font-size: 18px;
  line-height: 1.65;
  color: var(--body-on-navy-3);
  max-width: 640px;
  margin-bottom: 40px;
}
.hero-ctas {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 72px;
}
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: 900px;
  padding-top: 40px;
  border-top: 1px solid var(--line-dark);
}
.stat-num {
  font-size: 27px;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 6px;
}
.stat-label {
  font-size: 12.5px;
  color: var(--muted);
  font-weight: 500;
}

/* ============ Sections ============ */
.section { padding: 120px 0; position: relative; }
.section-light { background: var(--bg-light); }
.section-dark { background: var(--navy); }

/* About */
.about-section { position: relative; overflow: hidden; background: var(--navy-deep); }
.about-bg { position: absolute; inset: 0; }
.about-bg img { width: 100%; height: 100%; object-fit: cover; }
.about-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6,13,24,0.55) 0%, rgba(6,13,24,0.8) 55%, rgba(6,13,24,0.94) 100%);
}
.about-section .container { position: relative; }

.about-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 60px;
  align-items: start;
  margin-bottom: 90px;
}
.about-heading {
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1.25;
  color: var(--white);
}
.about-heading .line { display: block; }
.about-right {
  max-width: 620px;
}
.about-copy { display: flex; flex-direction: column; gap: 26px; padding-top: 6px; }
.about-copy p {
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--body-on-navy-2);
}
.about-copy-block { padding-top: 20px; border-top: 1px solid var(--line-dark); }
.about-copy-block:first-child { padding-top: 0; border-top: none; }

.feature-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  border-top: 1px solid var(--line-dark);
  padding-top: 56px;
}
.feature-num {
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan);
  margin-bottom: 18px;
}
.feature-card h3 { font-size: 19px; margin-bottom: 12px; color: var(--white); }
.feature-card p { font-size: 14.5px; line-height: 1.65; color: var(--body-on-navy-1); }

/* Process */
.process-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  margin-top: 64px;
}
.process-line { height: 2px; background: rgba(0,213,213,0.35); margin-bottom: 26px; }
.process-num { font-size: 32px; font-weight: 800; color: var(--cyan); margin-bottom: 14px; }
.process-card h3 { font-size: 18.5px; color: var(--white); margin-bottom: 12px; }
.process-card p { font-size: 13.5px; line-height: 1.6; color: var(--body-on-navy-1); }

/* Products */
.products-section {
  position: relative;
  overflow: hidden;
  background: var(--navy-deep);
}
.products-bg {
  position: absolute;
  inset: 0;
}
.products-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.products-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(6, 13, 24, 0.3);
}
.products-section .container { position: relative; }

.products-subheading {
  font-size: clamp(22px, 2.6vw, 28px);
  color: var(--white);
  font-weight: 800;
  margin: 64px 0 0;
  padding-top: 48px;
  border-top: 1px solid var(--line-dark);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  margin-top: 56px;
  position: relative;
}

.product-item {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.product-card {
  background: #EDF1F6;
  border-radius: var(--radius);
  padding: 34px 28px 28px;
  border-top: 3px solid var(--blue);
  transition: transform .2s ease, box-shadow .2s ease;
  flex: 1;
}
.product-card:hover { transform: translateY(-4px); box-shadow: 0 20px 40px -20px rgba(0,0,0,0.45); }
.product-code { font-size: 26px; font-weight: 800; color: var(--blue); margin-bottom: 8px; }
.product-tag { font-size: 12px; font-weight: 600; color: var(--body-dark); margin-bottom: 18px; }
.product-card h3 { font-size: 19px; line-height: 1.35; color: var(--ink); margin-bottom: 14px; }
.product-card p { font-size: 13.5px; line-height: 1.65; color: var(--body-dark); }
.product-badge {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.01em;
  padding: 0 4px;
}

/* Strategy */
.strategy {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
  background: var(--navy);
}
.strategy-image { position: relative; overflow: hidden; }
.strategy-image img { width: 100%; height: 100%; object-fit: cover; min-height: 420px; }
.strategy-panel {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 80px 64px;
}
.strategy-para {
  font-size: 16px;
  line-height: 1.75;
  color: var(--body-on-navy-2);
  margin-top: 22px;
  max-width: 480px;
}
.strategy-footer {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 44px;
  padding-top: 28px;
  border-top: 1px solid var(--line-dark);
}
.strategy-footer span {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--cyan);
}

/* Applications */
.applications { position: relative; overflow: hidden; background: var(--navy-deep); }
.applications-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.applications-bg img { width: 100%; height: 100%; object-fit: cover; }
.applications-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6,13,24,0.55) 0%, rgba(6,13,24,0.8) 55%, rgba(6,13,24,0.94) 100%);
}
.applications .container { position: relative; }
.app-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin-top: 56px;
  position: relative;
}
.app-image {
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 16/7;
  margin-bottom: 26px;
}
.app-image img { width: 100%; height: 100%; object-fit: cover; }
.app-card h3 { font-size: 22px; color: var(--white); margin-bottom: 14px; }
.app-card p { font-size: 15px; line-height: 1.7; color: var(--body-on-navy-2); max-width: 480px; }

/* ============ Footer ============ */
.footer {
  position: relative;
  color: var(--white);
  overflow: hidden;
  padding-top: 130px;
  background: var(--navy-deep);
}
.footer-bg {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 418px;
}
.footer-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}
.footer-overlay {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 418px;
  background: rgba(6,13,24,0.6);
}
.footer-content { position: relative; padding-bottom: 40px; }
.footer-heading {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.25;
  margin-bottom: 40px;
}
.footer-heading .line { display: block; }
.footer-cta {
  display: inline-block;
  font-size: 18px;
  font-weight: 700;
  color: var(--cyan);
  padding-bottom: 10px;
  border-bottom: 1.5px solid rgba(0,213,213,0.4);
  margin-bottom: 100px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  padding-top: 44px;
  border-top: 1px solid var(--line-dark);
}
.footer-logo { font-size: 27px; font-weight: 800; margin-bottom: 8px; }
.footer-tagline { font-size: 16px; color: var(--cyan); font-weight: 500; }
.footer-info-name { font-size: 16px; font-weight: 700; margin-bottom: 14px; }
.footer-info-row {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 12px;
  font-size: 13px;
  color: var(--body-on-navy-2);
  line-height: 2;
}
.footer-info-row span:first-child { color: var(--muted); }
.footer-info-row a { color: inherit; transition: color .2s ease; }
.footer-info-row a:hover { color: var(--cyan); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  margin-top: 60px;
  padding-top: 24px;
  padding-bottom: 24px;
  border-top: 1px solid var(--line-dark);
  font-size: 12.5px;
  color: var(--muted);
}

/* ============ Responsive ============ */
@media (max-width: 980px) {
  .container { padding: 0 24px; }
  .nav-inner { padding: 0 24px; }
  .nav-links {
    position: absolute;
    top: 72px; left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(6, 13, 24, 0.98);
    max-height: 0;
    overflow: hidden;
    transition: max-height .25s ease;
  }
  .nav-links.open { max-height: 320px; }
  .nav-links a {
    padding: 16px 24px;
    border-top: 1px solid rgba(255,255,255,0.08);
  }
  .nav-burger { display: flex; }
  .nav-burger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-burger.active span:nth-child(2) { opacity: 0; }
  .nav-burger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .nav-burger span { transition: transform .2s ease, opacity .2s ease; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); row-gap: 32px; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-right { grid-template-columns: 1fr; }
  .feature-row { grid-template-columns: 1fr; gap: 36px; }
  .process-row { grid-template-columns: 1fr 1fr; }
  .product-grid { grid-template-columns: 1fr 1fr; }
  .strategy { grid-template-columns: 1fr; }
  .strategy-image { min-height: 320px; }
  .strategy-panel { padding: 56px 24px; }
  .app-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}
@media (max-width: 620px) {
  .section { padding: 80px 0; }
  .hero-content { padding-top: 130px; padding-bottom: 60px; }
  .hero-ctas { flex-direction: column; align-items: stretch; }
  .hero-ctas .btn { width: 100%; }
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .process-row { grid-template-columns: 1fr; }
  .product-grid { grid-template-columns: 1fr; }
  .footer-cta { margin-bottom: 60px; }
  .nav-cta { display: none; }
}