body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  background: #181a20;
  color: #f5f6fa;
  font-family: 'Segoe UI', 'Roboto', Arial, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
}

.center-container {
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.message-box {
  background: rgba(30, 32, 40, 0.95);
  border-radius: 18px;
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
  padding: 48px 36px;
  text-align: center;
}

.main-text {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}

.sub-text {
  font-size: 1.2rem;
  color: #b0b3b8;
  margin-top: 0;
}

.highlight {
  color: #8ecfff;
  font-style: italic;
}

.copyright-mark {
  position: fixed;
  bottom: 16px;
  left: 0;
  width: 100%;
  text-align: center;
  color: #777;
  font-size: 0.95rem;
  opacity: 0.6;
  letter-spacing: 0.03em;
  pointer-events: none;
  user-select: none;
}