/* css/site.css */
:root{
  --bg:#0b1020;
  --text:#eaf0ff;
  --muted:rgba(234,240,255,.72);
  --line:rgba(255,255,255,.12);
  --card:rgba(255,255,255,.06);
  --card2:rgba(255,255,255,.08);
  --accent:#7dd3fc; /* 하늘색 계열 */
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family: system-ui, -apple-system, Segoe UI, Roboto, "Noto Sans KR", sans-serif;
  background: linear-gradient(180deg, #070a14 0%, #0b1020 40%, #070a14 100%);
  color: var(--text);
  line-height: 1.6;
}

a{color:inherit;text-decoration:none}
.container{width:min(1120px, calc(100% - 40px)); margin:0 auto}

/* TOPBAR */
.topbar{
  position:sticky; top:0; z-index:50;
  backdrop-filter: blur(12px);
  background: rgba(5,8,18,.55);
  border-bottom: 1px solid var(--line);
}
.topbar-inner{
  height:64px; display:flex; align-items:center; justify-content:space-between;
  gap:16px;
}
.brand{display:flex; gap:10px; align-items:baseline}
.brand-mark{font-weight:800; letter-spacing:.5px}
.brand-sub{font-size:12px; color:var(--muted)}
.nav{display:flex; gap:18px; align-items:center}
.nav a{color:var(--muted)}
.nav a:hover{color:var(--text)}
.nav-toggle{
  display:none;
  background:transparent; border:1px solid var(--line); color:var(--text);
  border-radius:10px; padding:8px 10px; cursor:pointer;
}

/* BUTTON */
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  padding:12px 16px; border-radius:14px;
  background: linear-gradient(135deg, rgba(125,211,252,.95), rgba(167,139,250,.95));
  color:#06101a; font-weight:800;
  box-shadow: 0 12px 30px rgba(0,0,0,.35);
}
.btn:hover{transform: translateY(-1px)}
.btn-ghost{
  background: transparent; color: var(--text);
  border: 1px solid var(--line);
  box-shadow: none;
}
.btn-small{padding:10px 12px; border-radius:12px}

/* HERO */
.hero{position:relative; min-height: 86vh; display:grid; align-items:center}
.hero-media{position:absolute; inset:0; overflow:hidden}
.hero-video{
  width:100%; height:100%; object-fit:cover;
  filter: saturate(1.05) contrast(1.05);
  transform: scale(1.02);
}
.hero-overlay{
  position:absolute; inset:0;
  background:
    radial-gradient(1200px 500px at 20% 20%, rgba(125,211,252,.22), transparent 60%),
    radial-gradient(900px 500px at 80% 10%, rgba(167,139,250,.18), transparent 55%),
    linear-gradient(180deg, rgba(5,8,18,.25) 0%, rgba(5,8,18,.78) 55%, rgba(5,8,18,.95) 100%);
  border-bottom:1px solid var(--line);
}
.hero-content{position:relative; padding: 90px 0 48px}
.pill{
  display:inline-flex; padding:7px 12px; border-radius:999px;
  background: rgba(255,255,255,.08);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}
.hero-title{
  margin:16px 0 10px;
  font-size: clamp(34px, 4.8vw, 62px);
  line-height: 1.12;
  letter-spacing: -.5px;
}
.accent{color: var(--accent)}
.hero-desc{max-width: 680px; color: var(--muted); font-size: 16px}
.hero-actions{display:flex; gap:12px; margin-top:18px; flex-wrap:wrap}
.hero-metrics{
  display:flex; gap:16px; flex-wrap:wrap;
  margin-top:28px;
}
.metric{
  width:180px;
  background: rgba(255,255,255,.06);
  border:1px solid var(--line);
  border-radius: 18px;
  padding: 14px 16px;
}
.metric-num{font-size:22px; font-weight:900}
.metric-label{font-size:12px; color: var(--muted)}

/* SECTIONS */
.section{padding: 72px 0}
.section-alt{background: rgba(255,255,255,.03); border-top:1px solid var(--line); border-bottom:1px solid var(--line)}
.section-head{margin-bottom: 18px}
.section-title{margin:0 0 8px; font-size: 26px}
.section-desc{margin:0; color: var(--muted)}
.grid-2{display:grid; grid-template-columns: 1.2fr .8fr; gap: 22px; align-items:start}

.checklist{margin:18px 0 0; padding:0; list-style:none}
.checklist li{
  margin:10px 0;
  padding-left: 22px;
  position:relative;
  color: var(--muted);
}
.checklist li:before{
  content:"✓";
  position:absolute; left:0; top:0;
  color: var(--accent);
  font-weight:900;
}

.about-card{
  background: rgba(255,255,255,.06);
  border:1px solid var(--line);
  border-radius: 22px;
  padding: 18px;
}
.about-card-title{font-weight:900; font-size: 18px}
.about-card-desc{color: var(--muted); margin-top: 10px}
.about-badges{display:flex; gap:10px; flex-wrap:wrap; margin-top: 14px}
.badge{
  padding:6px 10px; border-radius: 999px;
  background: rgba(255,255,255,.07);
  border:1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
}

/* Cards */
.cards{display:grid; grid-template-columns: repeat(3, 1fr); gap:16px; margin-top: 14px}
.card{
  background: rgba(255,255,255,.06);
  border:1px solid var(--line);
  border-radius: 22px;
  padding: 18px;
  transition: transform .15s ease;
}
.card:hover{transform: translateY(-2px)}
.card-icon{font-size: 22px}
.card-title{margin:10px 0 6px; font-size: 18px}
.card-desc{margin:0; color: var(--muted)}
.card-link{display:inline-flex; margin-top: 12px; color: var(--accent); font-weight: 800}

/* References */
.ref-grid{display:grid; grid-template-columns: repeat(3, 1fr); gap:16px; margin-top: 16px}
.ref-card{
  display:block;
  background: rgba(255,255,255,.06);
  border:1px solid var(--line);
  border-radius: 22px;
  overflow:hidden;
  transition: transform .15s ease;
}
.ref-card:hover{transform: translateY(-2px)}
.ref-thumb{height:160px; background-size:cover; background-position:center}
.ref-body{padding: 14px 16px}
.ref-title{font-weight:900; margin-bottom:6px}
.ref-meta{display:flex; align-items:center; gap:8px; color: var(--muted); font-size: 12px}
.ref-meta .dot{opacity:.6}
.ref-desc{margin-top:10px; color: var(--muted); font-size: 13px}

.empty{
  margin-top:16px;
  padding: 18px;
  border-radius: 18px;
  border:1px dashed var(--line);
  color: var(--muted);
}
.center{display:flex; justify-content:center; margin-top: 20px}

/* CTA */
.cta{
  padding: 56px 0;
  background:
    radial-gradient(900px 450px at 20% 40%, rgba(125,211,252,.18), transparent 60%),
    radial-gradient(900px 450px at 80% 40%, rgba(167,139,250,.16), transparent 60%),
    rgba(255,255,255,.03);
  border-top:1px solid var(--line);
}
.cta-inner{
  display:flex; justify-content:space-between; align-items:center;
  gap:18px;
  border:1px solid var(--line);
  border-radius: 26px;
  padding: 22px;
  background: rgba(0,0,0,.12);
}
.cta-title{margin:0; font-size: 22px}
.cta-desc{margin:8px 0 0; color: var(--muted)}

/* Footer */
.footer{padding: 28px 0; color: var(--muted)}
.footer-inner{display:flex; justify-content:space-between; align-items:center; gap:14px; border-top:1px solid var(--line); padding-top: 18px}
.footer-brand{font-weight:900; color: var(--text)}
.footer-right{display:flex; gap:14px}
.footer-right a:hover{color: var(--text)}

/* Mobile */
@media (max-width: 900px){
  .nav{display:none}
  .nav-toggle{display:inline-flex}
  body.nav-open .nav{
    display:flex;
    position:absolute;
    top:64px; left:0; right:0;
    background: rgba(5,8,18,.92);
    border-bottom:1px solid var(--line);
    padding: 14px 20px;
    flex-direction:column;
    align-items:flex-start;
  }
  .grid-2{grid-template-columns: 1fr}
  .cards{grid-template-columns: 1fr}
  .ref-grid{grid-template-columns: 1fr}
  .hero{min-height: 78vh}
  .metric{width: 100%}
  .cta-inner{flex-direction:column; align-items:flex-start}
}

/* ---------------------------
   ADMIN LOGIN
--------------------------- */
.login-card{
  width: min(520px, calc(100% - 40px));
  margin: 10vh auto 0;
  padding: 26px 24px;
  border-radius: 22px;
  background: rgba(255,255,255,.06);
  border: 1px solid var(--line);
  box-shadow: 0 18px 50px rgba(0,0,0,.45);
}

.login-title{
  margin: 0 0 18px;
  font-size: 34px;
  letter-spacing: -.5px;
  font-weight: 900;
}

.form-row{
  margin: 14px 0;
}

.form-row label{
  display:block;
  margin-bottom: 8px;
  color: var(--muted);
  font-weight: 700;
}

.input{
  width: 100%;
  height: 44px;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(0,0,0,.22);
  color: var(--text);
  outline: none;
}

.input:focus{
  border-color: rgba(125,211,252,.55);
  box-shadow: 0 0 0 4px rgba(125,211,252,.12);
}

.btn-full{
  width: 100%;
}

.error{
  margin: 0 0 14px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid rgba(248,113,113,.45);
  background: rgba(248,113,113,.12);
  color: #fee2e2;
  font-weight: 700;
}

.hint{
  margin-top: 14px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 520px){
  .login-card{ margin-top: 7vh; padding: 22px 18px; }
  .login-title{ font-size: 28px; }
}