:root {
  --bg: #223c61;
  --card: rgba(255,255,255,0.10);
  --border: rgba(255,255,255,0.16);
  --text: #ffffff;
  --muted: #cdd8e6;
  --btn-bg: rgba(255,255,255,0.95);
  --btn-text: #1d3b63;
  --shadow: rgba(0,0,0,0.35);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: "Noto Sans KR", Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(1200px 700px at 50% -10%, rgba(255,255,255,0.10), transparent 55%),
              radial-gradient(900px 600px at 90% 20%, rgba(212,178,76,0.08), transparent 55%),
              var(--bg);
  color: var(--text);
}

.wrap {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 44px 18px;
}

.shell {
  width: min(520px, 100%);
  text-align: center;
}

.logo {
  width: min(520px, 100%);
  height: auto;
  margin: 0 auto 20px;
  display: block;
}

.card {
  border: 1px solid var(--border);
  background: var(--card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 22px;
  padding: 26px 22px 22px;
  box-shadow: 0 20px 60px var(--shadow);
}

.title {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 10px;
  letter-spacing: -0.2px;
}

.desc {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.45;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  border-radius: 14px;
  padding: 14px 14px;
  background: var(--btn-bg);
  color: var(--btn-text);
  text-decoration: none;
  font-weight: 600;
  border: 1px solid rgba(0,0,0,0.06);
  transition: transform 120ms ease, box-shadow 120ms ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 26px rgba(0,0,0,0.18);
}

.btn:active {
  transform: translateY(0px);
}

.meta {
  margin-top: 14px;
  font-size: 12px;
  color: rgba(255,255,255,0.75);
}

.small {
  font-size: 12px;
  color: rgba(255,255,255,0.7);
  margin-top: 10px;
}

@media (prefers-reduced-motion: reduce) {
  .btn { transition: none; }
}