@keyframes auth-gate-in {
  from {
    opacity: 0;
    transform: translateY(18px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes auth-gate-out {
  from {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateY(18px) scale(0.97);
  }
}

@keyframes auth-backdrop-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes auth-backdrop-out {
  from { opacity: 1; }
  to { opacity: 0; }
}

.auth-gate {
  width: min(410px, calc(100vw - 2.5rem));
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.06);
  color: #f2f2f2;
  box-shadow:
    0 24px 80px rgba(0, 0, 0, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.18),
    inset 0 -1px 0 rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(40px) saturate(180%);
  -webkit-backdrop-filter: blur(40px) saturate(180%);
  font-family: "Texta", sans-serif;
}

.auth-gate[open]:not(.is-closing) {
  animation: auth-gate-in 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

.auth-gate[open].is-closing {
  animation: auth-gate-out 0.5s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.auth-gate::backdrop {
  background: rgba(0, 0, 0, 0.22);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.auth-gate[open]:not(.is-closing)::backdrop {
  animation: auth-backdrop-in 0.4s ease;
}

.auth-gate[open].is-closing::backdrop {
  animation: auth-backdrop-out 0.4s ease forwards;
}

.auth-gate__card {
  position: relative;
  padding: 3.15rem 2.9rem 2.75rem;
  text-align: center;
}

.auth-gate__close {
  position: absolute;
  top: 0.85rem;
  right: 0.9rem;
  width: 2rem;
  height: 2rem;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: rgba(255, 255, 255, 0.45);
  font-size: 1.35rem;
  font-weight: 300;
  line-height: 1;
  cursor: pointer;
  transition: color 0.2s ease, background 0.2s ease;
}

.auth-gate__close:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.auth-gate__card h2 {
  margin: 0 0 1.2rem;
  font-family: "Texta Alt", sans-serif;
  font-size: 1.7rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.auth-gate__message {
  margin: 0 0 2rem;
  color: rgba(255, 255, 255, 0.72);
  font-family: "Texta Alt", sans-serif;
  font-size: 1.05rem;
  font-weight: 400;
  line-height: 1.45;
}

.btn--steam {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  margin-top: 0.35rem;
  padding: 0.72rem 1.4rem;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  text-decoration: none;
  font-family: "Texta Alt", sans-serif;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  box-shadow:
    0 4px 18px rgba(0, 0, 0, 0.22),
    inset 0 1px 0 rgba(255, 255, 255, 0.16);
  --mirror-x: 50%;
  --mirror-y: 50%;
  --mirror-opacity: 0;
  transition:
    background 0.25s ease,
    border-color 0.25s ease,
    box-shadow 0.25s ease;
}

.btn--steam::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: var(--mirror-opacity);
  background: radial-gradient(
    circle 5rem at var(--mirror-x) var(--mirror-y),
    rgba(255, 255, 255, 0.22) 0%,
    rgba(255, 255, 255, 0.14) 22%,
    rgba(255, 255, 255, 0.08) 42%,
    rgba(255, 255, 255, 0.03) 62%,
    rgba(255, 255, 255, 0.01) 78%,
    transparent 100%
  );
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.btn--steam:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.28);
  box-shadow:
    0 8px 28px rgba(0, 0, 0, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.24);
}

.btn--steam__icon {
  position: relative;
  z-index: 1;
  display: inline-flex;
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
}

.btn--steam__label {
  position: relative;
  z-index: 1;
}

.btn--steam__icon svg {
  display: block;
  width: 100%;
  height: 100%;
}