body, html {
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
  font-family: 'Fira Mono', 'Consolas', 'Menlo', monospace;
  background: #0a0a1a;
  color: #5eeaff;
}

#space {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  display: block;
}

.center-container {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.terminal-sign {
  background: rgba(20, 20, 20, 0.85);
  border-radius: 10px;
  box-shadow: 0 8px 32px 0 rgba(0,0,0,0.37);
  border: 1.5px solid rgba(255,255,255,0.08);
  min-width: 320px;
  padding: 2.5rem 2.5rem 1.5rem 2.5rem;
  margin-bottom: 2rem;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

.nickname {
  color: #5eeaff;
  font-size: 2.2rem;
  letter-spacing: 0.05em;
  text-shadow: 0 0 8px #5eeaff44, 0 0 2px #fff;
  font-family: inherit;
  text-align: center;
  width: 100%;
}

.subtitle {
  display: block;
  margin-top: 0.5rem;
  font-size: 1rem;
  color: #5eeaffcc;
  text-align: center;
  letter-spacing: 0.03em;
  opacity: 0.85;
  font-family: inherit;
}

.button-group {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
}

.btn {
  background: rgba(30, 30, 30, 0.85);
  color: #5eeaff;
  border: 1.5px solid #5eeaff44;
  border-radius: 6px;
  padding: 0.7rem 2.2rem;
  font-size: 1.1rem;
  font-family: inherit;
  text-decoration: none;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 8px 0 rgba(0,0,0,0.18);
}

.btn:hover {
  background: #5eeaff;
  color: #222;
  box-shadow: 0 4px 16px 0 #5eeaff33;
}

@media (max-width: 600px) {
  .terminal-sign {
    min-width: 0;
    width: 90vw;
    padding: 1.2rem 0.7rem 1rem 0.7rem;
  }
  .nickname {
    font-size: 1.3rem;
  }
  .button-group {
    flex-direction: column;
    gap: 0.8rem;
    width: 100%;
    align-items: center;
  }
  .btn {
    width: 90%;
    font-size: 1rem;
    padding: 0.7rem 0;
    text-align: center;
  }
  .center-container {
    width: 100vw;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 0 0.5rem;
  }
}

@media (max-width: 350px) {
  .terminal-sign {
    padding: 0.7rem 0.2rem 0.7rem 0.2rem;
  }
  .nickname {
    font-size: 1rem;
  }
}

#space {
  width: 100vw !important;
  height: 100vh !important;
  min-width: 100vw;
  min-height: 100vh;
  max-width: 100vw;
  max-height: 100vh;
}