.nickname-prompt-overlay {
  position: fixed;
  inset: 0;
  z-index: 1200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(6, 8, 22, 0.72);
  backdrop-filter: blur(6px);
}

.nickname-prompt {
  width: 100%;
  max-width: 420px;
  padding: 26px 24px 22px;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: linear-gradient(160deg, #191a33 0%, #12132a 100%);
  color: #eef0ff;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}

.nickname-prompt h3 {
  margin: 0 0 10px;
  font-size: 1.2rem;
}

.nickname-prompt p {
  margin: 0 0 16px;
  font-size: 0.9rem;
  line-height: 1.5;
  color: rgba(238, 240, 255, 0.75);
}

.nickname-prompt-field {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 0 12px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.05);
}

.nickname-prompt-field:focus-within {
  border-color: rgba(99, 102, 241, 0.8);
}

.nickname-prompt-field span {
  color: rgba(238, 240, 255, 0.5);
  font-weight: 700;
}

.nickname-prompt-field input {
  flex: 1;
  min-width: 0;
  padding: 11px 0;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: 0.95rem;
  outline: none;
}

.nickname-prompt-hint {
  margin-top: 8px;
  font-size: 0.78rem;
  color: rgba(238, 240, 255, 0.55);
  min-height: 18px;
}

.nickname-prompt-hint.error {
  color: #fca5a5;
}

.nickname-prompt-note {
  margin-top: 12px;
  font-size: 0.78rem;
  color: rgba(238, 240, 255, 0.45);
}

.nickname-prompt-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 18px;
}

.nickname-prompt-actions button {
  min-height: 38px;
  padding: 0 18px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.nickname-prompt-actions button:hover {
  transform: translateY(-1px);
}

.nickname-prompt-later {
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: transparent;
  color: rgba(238, 240, 255, 0.7);
}

.nickname-prompt-save {
  border: 1.5px solid rgba(99, 102, 241, 0.8);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.5) 0%, rgba(236, 72, 153, 0.35) 100%);
  color: #fff;
}

.nickname-prompt-save:disabled {
  opacity: 0.6;
  cursor: default;
  transform: none;
}

.nickname-prompt-required {
  margin: -6px 0 16px !important;
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(99, 102, 241, 0.14);
  border: 1px solid rgba(99, 102, 241, 0.32);
  font-size: 0.85rem !important;
  color: #eef0ff !important;
}

.nickname-prompt-signout {
  display: block;
  margin: 14px auto 0;
  padding: 6px 10px;
  border: none;
  background: none;
  color: rgba(238, 240, 255, 0.5);
  font-family: inherit;
  font-size: 0.8rem;
  text-decoration: underline;
  cursor: pointer;
}
.nickname-prompt-signout:hover { color: rgba(238, 240, 255, 0.85); }
.nickname-prompt-signout:disabled { opacity: 0.5; cursor: default; }

.nickname-prompt-hint.ok { color: #6ee7b7; }

.is-required .nickname-prompt-actions { justify-content: stretch; }
.is-required .nickname-prompt-save { flex: 1; }