body {
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 1.5rem;
  text-align: center;
  letter-spacing: 0.05em;
}

.login-form,
.register-form {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2rem 2.25rem;
  width: 100%;
  max-width: 360px;
}

.username-input,
.password-input {
  background: var(--surface-dark);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 0.9rem;
  padding: 0.625rem 0.875rem;
  outline: none;
  transition: border-color 0.15s;
}

.username-input::placeholder,
.password-input::placeholder {
  color: var(--muted);
}

.username-input:focus,
.password-input:focus {
  border-color: var(--accent);
}

.login-btn,
.register-btn {
  background: var(--primary);
  border: none;
  border-radius: 6px;
  color: var(--white);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  margin-top: 0.25rem;
  padding: 0.625rem;
  transition: background 0.15s;
}

.login-btn:hover,
.register-btn:hover {
  background: var(--primary-hv);
}

.login-error,
.register-error {
  font-size: 0.82rem;
  color: var(--error-tx);
  background: var(--error-bg);
  border: 1px solid var(--error-bd);
  border-radius: 5px;
  padding: 0.4rem 0.75rem;
  display: none;
}

.login-error.visible,
.register-error.visible {
  display: block;
}

.register-link {
  display: block;
  text-align: center;
  font-size: 0.85rem;
  color: var(--accent);
  text-decoration: none;
  padding-top: 0.25rem;
  transition: opacity 0.15s;
}

.register-link:hover {
  opacity: 0.75;
}