* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family:
    "Hiragino Sans",
    "Yu Gothic",
    "Meiryo",
    sans-serif;
  background: #0f172a;
  color: #fff;
  overflow: hidden;
}

.bg {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at top left, #1e3a8a 0%, transparent 40%),
    radial-gradient(circle at bottom right, #0ea5e9 0%, transparent 35%),
    linear-gradient(135deg, #020617 0%, #0f172a 100%);
  z-index: -1;
}

.container {
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.card {
  width: 100%;
  max-width: 620px;
  text-align: center;
  padding: 70px 40px;
  border-radius: 24px;
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(255,255,255,0.12);
  box-shadow:
    0 20px 50px rgba(0,0,0,0.35);
}

.logo {
  font-size: 18px;
  letter-spacing: 0.3em;
  margin-bottom: 28px;
  color: rgba(255,255,255,0.8);
}

h1 {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 24px;
  line-height: 1.4;
}

.sub {
  font-size: 18px;
  line-height: 2;
  color: rgba(255,255,255,0.82);
}

.line {
  width: 80px;
  height: 1px;
  background: rgba(255,255,255,0.3);
  margin: 36px auto;
}

.en {
  font-size: 14px;
  letter-spacing: 0.4em;
  color: rgba(255,255,255,0.6);
}

@media (max-width: 768px) {

  .card {
    padding: 50px 24px;
  }

  h1 {
    font-size: 34px;
  }

  .sub {
    font-size: 15px;
  }

}