:root {
  --bg:#fff;
  --fg:#0f172a;
  --muted:#475569;
  --edge:#0b3b74;
  --accent:#27AE60;
  --surface:#f8fafc;
  --card-shadow:0 6px 18px rgba(16,24,40,.08), 0 2px 6px rgba(16,24,40,.06);
}

/* Reset */
body {
  margin: 0;
  font-family: "Pretendard", system-ui, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
.container { width: min(1200px, 92vw); margin: auto; }

/* Header */
header {
  position: sticky; top: 0;
  background: rgba(255,255,255,.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(0,0,0,.08);
  z-index: 10;
}
.nav {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 0;
}
.logo a { font-weight: 900; font-size: 22px; }
.logo .mark { border: 2px solid var(--fg); padding: 6px 10px; border-radius: 10px; }
.menu { display: flex; gap: 20px; }
.menu a { color: var(--muted); font-weight: 600; padding: 8px 10px; border-radius: 8px; }
.menu a[aria-current="page"] { color: var(--fg); font-weight: 700; }
.menu a:hover { background: #e9f1ff; }
.hamburger { display: none; }
@media (max-width: 860px) {
  .menu { display: none; }
  .menu.open {
    display: flex; flex-direction: column;
    background: #fff; border: 1px solid rgba(0,0,0,.1);
    position: absolute; top: 60px; left: 16px; right: 16px;
    border-radius: 10px; padding: 10px;
  }
  .hamburger {
    display: block; background: none;
    border: 1px solid rgba(0,0,0,.1);
    border-radius: 8px; padding: 6px 10px;
  }
}

/* Hero */
.hero-card {
  text-align: center;
  padding: 80px 0 60px;
}
.hero-card h1 {
  font-size: clamp(28px,5vw,42px);
  margin: 0;
}
.hero-card p {
  color: var(--muted);
  font-size: 18px;
}

/* Mission / Vision */
.about-slab {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  padding: 20px 0 40px;
}
.slab {
  background: var(--surface);
  border-radius: 16px;
  box-shadow: var(--card-shadow);
  padding: 20px;
}
.slab h3 { margin: 0 0 8px; color: var(--edge); }
.slab p { margin: 0; color: var(--muted); }
@media (max-width: 860px) { .about-slab { grid-template-columns: 1fr; } }

/* Values */
.values .grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px,1fr));
  gap: 16px;
}
.card {
  background: #fff;
  border-radius: 16px;
  box-shadow: var(--card-shadow);
  padding: 18px;
  transition: transform .25s ease;
}
.card:hover { transform: translateY(-4px); }
.card h4 { margin: 0 0 6px; color: var(--edge); }
.card p { margin: 0; color: var(--muted); }

/* Timeline */
.timeline {
  position: relative;
  padding: 40px 0;
}
.timeline .line {
  position: absolute;
  left: 50%;
  top: 0; bottom: 0;
  width: 2px;
  background: rgba(11,59,116,.2);
  transform: translateX(-50%);
}
.timeline .items { position: relative; z-index: 1; }
.timeline .trow {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  margin: 16px 0;
}
.timeline .trow time {
  font-weight: 700;
  color: var(--muted);
}
.timeline .bubble {
  background: #fff;
  border-radius: 14px;
  box-shadow: var(--card-shadow);
  padding: 14px;
}
.timeline .trow.left time { text-align: right; padding-right: 12px; }
.timeline .trow.right time { text-align: left; padding-left: 12px; }
@media (max-width: 860px) {
  .timeline .line { left: 12px; transform: none; }
  .timeline .trow { grid-template-columns: 100px 1fr; }
  .timeline .trow.left time,
  .timeline .trow.right time { text-align: left; }
}

/* Footer */
footer {
  border-top: 1px solid rgba(0,0,0,.08);
  text-align: center;
  color: var(--muted);
  padding: 24px 0;
}

/* Reveal Animation */
.reveal { opacity: 0; transform: translateY(24px); transition: .6s ease; }
.reveal.show { opacity: 1; transform: translateY(0); }