:root{
  --brand:#091f3a;
  --bg:#ffffff;
  --text:#0f172a;
  --sub:#64748b;
  --line:#e5e7eb;
  --card:#ffffff;
  --shadow: 0 14px 36px rgba(15, 23, 42, .08);
  --radius: 18px;

  --container: 1120px;
  --header-h: 64px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: Pretendard, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  overflow-x:hidden;
}

a{ color:inherit; text-decoration:none; }
img{ display:block; max-width:100%; }
button{ font-family:inherit; }

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

/* -----------------------------
   Header
----------------------------- */
.site-header{
  position:fixed;
  top:0; left:0; right:0;
  height: var(--header-h);
  z-index: 1000;
  background: rgba(255,255,255,.75);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(229,231,235,.65);
}

.header-inner{
  height: var(--header-h);
  display:flex;
  align-items:center;
  justify-content: space-around; /* 사용자 규칙 */
  gap: 16px;
}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
}
.brand-logo{
  height: 40px;
  width:auto;
}

.gnb{
  display:flex;
  align-items:center;
  gap: 18px;
}
.gnb a{
  font-weight: 600;
  font-size: 14px;
  color: rgba(15,23,42,.78);
}
.gnb a:hover{ color: var(--brand); }

.burger{
  display:none;
  width: 44px; height: 44px;
  border: none;
  border-radius: 12px;
  background: none;
  cursor:pointer;
  position:relative;
}
.burger span{
  position:absolute;
  left: 12px;
  right: 12px;
  height: 2px;
  background: var(--brand);
  border-radius: 2px;
  transition: .25s ease;
}
.burger span:nth-child(1){ top: 15px; }
.burger span:nth-child(2){ top: 21px; }
.burger span:nth-child(3){ top: 27px; }

.burger.is-open span:nth-child(1){ top: 21px; transform: rotate(45deg); }
.burger.is-open span:nth-child(2){ opacity:0; transform: translateX(6px); }
.burger.is-open span:nth-child(3){ top: 21px; transform: rotate(-45deg); }

/* Mobile dropdown nav */
.mnav{
  position:absolute;
  top: var(--header-h);
  left:0; right:0;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(229,231,235,.8);
  transform: translateY(-8px);
  opacity: 0;
  pointer-events:none;
  transition: .22s ease;
}
.mnav.is-open{
  transform: translateY(0);
  opacity: 1;
  pointer-events:auto;
}
.mnav-inner{
  padding: 14px 0 18px;
  display:flex;
  flex-direction: column;
  gap: 14px;
}

.mnav-top{
  display:flex;
  justify-content: space-around;
  gap: 10px;
}
.mnav-icon{
  width: 44px; height: 44px;
  display:grid;
  place-items:center;
  border-radius: 14px;
  border: 1px solid rgba(229,231,235,.9);
  background: none;
  color: var(--brand);
}

.mnav-links{
  display:flex;
  justify-content: space-around;
  gap: 10px;
}
.mnav-links a{
  font-weight:700;
  font-size: 14px;
  padding: 10px 12px;
  border-radius: 12px;
  color: rgba(15,23,42,.78);
}
.mnav-links a:hover{
  background: rgba(9,31,58,.06);
  color: var(--brand);
}

/* body scroll lock */
/* body.nav-open{
  overflow: hidden;
} */

/* -----------------------------
   Buttons
----------------------------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap: 8px;
  padding: 12px 16px;
  border-radius: 14px;
  border: 1px solid transparent;
  font-weight: 700;
  font-size: 14px;
  cursor:pointer;
  transition: .18s ease;
  user-select:none;
}
.btn--sm{
  padding: 10px 12px;
  border-radius: 12px;
  font-size: 13px;
}
.btn--primary{
  background: var(--brand);
  color: #fff;
  box-shadow: 0 14px 26px rgba(9,31,58,.22);
}
.btn--primary:hover{ transform: translateY(-1px); }

.btn--ghost{
  background: rgba(255,255,255,.14);
  color: #fff;
  border-color: rgba(255,255,255,.35);
}
.btn--ghost:hover{ background: rgba(255,255,255,.20); }

.btn--outline{
  background: #fff;
  color: var(--brand);
  border-color: rgba(9,31,58,.22);
}
.btn--outline:hover{
  background: rgba(9,31,58,.06);
}

/* -----------------------------
   Reveal animation (IO)
----------------------------- */
.reveal{
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.is-in{
  opacity: 1;
  transform: translateY(0);
}

/* -----------------------------
   Footer
----------------------------- */
.footer{
  background: #070f1e;
  color: rgba(255,255,255,.82);
  padding: 34px 0 18px;
}
.footer-inner{
  display:flex;
  align-items:flex-start;
  justify-content: space-around;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-logo{ height: 46px; }
.footer-desc{ margin: 10px 0 0; font-size: 13px; color: rgba(255,255,255,.72); }
.footer-links{
  display:flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items:center;
}
.footer-links a{ font-weight: 700; font-size: 13px; color: rgba(255,255,255,.78); }
.footer-links a:hover{ color: #fff; }
.footer-sns{
  display:flex;
  gap: 12px;
}
.footer-sns a{
  width: 40px; height: 40px;
  display:grid;
  place-items:center;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.16);
  background: rgba(255,255,255,.06);
  color: #fff;
}
.footer-bottom{
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid rgba(255,255,255,.12);
  font-size: 12px;
  color: rgba(255,255,255,.62);
}

/* -----------------------------
   Responsive
----------------------------- */
@media (max-width: 860px){
  .gnb{ display:none; }
  .burger{ display:inline-block; }
}

@media (max-width: 420px){
  .container{ width: min(var(--container), calc(100% - 28px)); }
}