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


body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  height: 100vh;
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}


.bg-image {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.bgfull {
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 20, 0.55);
  z-index: 1;
}

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 32px;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.topbar h1 {
  font-size: 1.6rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.5px;
}

.helpbtn {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 7px 20px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.helpbtn:hover {
  background: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.5);
}


.center {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  background: rgba(10,10,20,.95);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 20px;
  padding: 48px 56px;
  min-width: 320px;
  text-align: center;
}

.tagline {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.75);
  letter-spacing: 0.3px;
}


.btngroup {
  display: flex;
  gap: 16px;
}

#login, #signup {
  font-size: 0.95rem;
  font-weight: 600;
  padding: 11px 36px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  transition: transform 0.15s, opacity 0.2s, background 0.2s;
  letter-spacing: 0.2px;
}

#login:active, #signup:active {
  transform: scale(0.97);
}


.btnprimary {
  background: #ffffff;
  color: #111111;
}

.btnprimary:hover {
  background: #e8e8e8;
}


.btnsecondary {
  background: transparent;
  color: #ffffff;
  border: 1.5px solid rgba(255, 255, 255, 0.55);
}

.btnsecondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.8);
}

@media (max-width: 480px) {
  .topbar {
    padding: 14px 20px;
  }

  .topbar h1 {
    font-size: 1.3rem;
  }

  .center {
    padding: 36px 28px;
    min-width: unset;
    width: 88%;
  }

  .btngroup {
    flex-direction: column;
    width: 100%;
  }

  #login, #signup {
    width: 100%;
    text-align: center;
  }
}