:root {
  --navy: #0B1B38;
  --blue: #2E6BFF;
  --blue-soft: #EAF0FF;
  --bg: #ffffff;
  --bg-soft: #F5F7FB;
  --text: #2B3958;
  --muted: #5B6B86;
  --border: #E4E9F2;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "Pretendard", -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", system-ui, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 24px; }

a { color: inherit; text-decoration: none; }
h1, h2, h3 { color: var(--navy); letter-spacing: -0.02em; }

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(1.2) blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; min-height: 64px; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; }
.logo { display: block; flex: none; }
.brand-name { font-weight: 700; font-size: 1.2rem; color: var(--navy); }
.brand-accent { color: var(--blue); }
.nav nav { display: flex; gap: 22px; flex-wrap: wrap; }
.nav nav a { color: var(--muted); font-size: 0.95rem; font-weight: 500; transition: color 0.15s; }
.nav nav a:hover { color: var(--navy); }

/* Hero */
.hero { padding: 88px 0 64px; }
.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--blue);
  margin: 0 0 18px;
  font-weight: 600;
}
.hero h1 {
  font-size: clamp(2rem, 5.2vw, 3.4rem);
  line-height: 1.15;
  margin: 0 0 20px;
  font-weight: 800;
}
.accent { color: var(--blue); }
.lead {
  color: var(--muted);
  font-size: clamp(1rem, 2.2vw, 1.18rem);
  max-width: 640px;
  margin: 0 0 30px;
}

.cta-row { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 13px 24px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.98rem;
  border: 1px solid transparent;
  transition: transform 0.12s, background 0.15s, border-color 0.15s, color 0.15s;
  cursor: pointer;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: #1f57e6; }
.btn-ghost { background: #fff; color: var(--navy); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--blue); color: var(--blue); }

/* Stats */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 56px 0 0;
  padding: 0;
  border-top: 1px solid var(--border);
  padding-top: 32px;
}
.stat { margin: 0; }
.stat dt { font-size: 0.82rem; color: var(--muted); margin: 0 0 6px; }
.stat dd { margin: 0; }
.stat .num {
  font-family: var(--mono);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 600;
  color: var(--navy);
  line-height: 1.1;
}
.stat .unit { color: var(--muted); font-weight: 400; }
.stat p { margin: 6px 0 0; font-size: 0.8rem; color: var(--muted); }

/* Sections */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section h2 {
  font-size: clamp(1.6rem, 3.6vw, 2.2rem);
  font-weight: 800;
  margin: 0 0 36px;
  text-align: center;
}

/* Pillars */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.15s;
}
.card:hover { border-color: #cfdafe; box-shadow: 0 8px 28px rgba(11, 27, 56, 0.06); transform: translateY(-2px); }
.ico { margin-bottom: 14px; line-height: 0; }
.card h3 { margin: 0 0 8px; font-size: 1.18rem; font-weight: 700; }
.card p { margin: 0; color: var(--muted); font-size: 0.97rem; }

/* Steps */
.steps { max-width: 680px; margin: 0 auto; padding: 0; list-style: none; }
.steps li { display: flex; gap: 18px; align-items: flex-start; padding: 18px 0; border-bottom: 1px solid var(--border); }
.steps li:last-child { border-bottom: none; }
.step-k { font-family: var(--mono); font-size: 0.95rem; font-weight: 600; color: var(--blue); flex: none; padding-top: 2px; }
.steps strong { color: var(--navy); font-size: 1.08rem; }
.steps p { margin: 4px 0 0; color: var(--muted); }

/* Trust */
.trust-list { list-style: none; padding: 0; margin: 0 auto; max-width: 640px; display: grid; gap: 12px; }
.trust-list li {
  display: flex;
  align-items: center;
  gap: 14px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
  color: var(--navy);
  font-size: 1rem;
  font-weight: 500;
}
.badge {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--blue);
  background: var(--blue-soft);
  border-radius: 6px;
  padding: 5px 9px;
  flex: none;
}

/* Contact */
.contact { text-align: center; }
.contact p { color: var(--muted); margin: 0 0 22px; }

/* Footer */
.footer { border-top: 1px solid var(--border); padding: 28px 0; background: #fff; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; color: var(--muted); font-size: 0.88rem; }
.footer-brand { display: inline-flex; align-items: center; gap: 8px; color: var(--navy); font-weight: 700; }

/* Responsive */
@media (max-width: 860px) {
  .grid-3 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 24px 16px; }
}
@media (max-width: 560px) {
  .hero { padding: 56px 0 44px; }
  .section { padding: 52px 0; }
  .nav nav { gap: 14px; }
  .nav nav a { font-size: 0.9rem; }
  .cta-row .btn { flex: 1 1 auto; text-align: center; }
}
@media (max-width: 380px) {
  .container { padding: 0 18px; }
  .nav nav a:first-child { display: none; }
}