/* ── Auth Screen ─────────────────────────────────────────── */
#auth-screen {
  display: flex;
  min-height: 100dvh;
  align-items: center;
  justify-content: center;
  background: var(--bg-darkest);
  position: fixed;
  inset: 0;
  z-index: 9999;
  overflow-x: hidden;
  overflow-y: auto;
  opacity: 1;
  transition: opacity 0.3s ease;
  pointer-events: auto;
  padding: max(var(--space-6), var(--safe-top)) max(var(--space-4), var(--safe-right)) max(var(--space-6), var(--safe-bottom)) max(var(--space-4), var(--safe-left));
  -webkit-overflow-scrolling: touch;
}
#auth-screen.hidden {
  opacity: 0;
  pointer-events: none;
}

/* Animated background blobs */
.auth-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}
.auth-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.1;
  will-change: transform, opacity;
  transform: translateZ(0);
}
.auth-blob-1 { width: 600px; height: 600px; background: var(--accent); top: -200px; left: -200px; animation: blobPulse 12s ease-in-out infinite; animation-delay: 0s; }
.auth-blob-2 { width: 400px; height: 400px; background: #00a8fc; bottom: -100px; right: -100px; animation: blobPulse 14s ease-in-out infinite; animation-delay: 4s; }
.auth-blob-3 { width: 300px; height: 300px; background: var(--success); top: 50%; left: 50%; transform: translate(-50%, -50%) translateZ(0); animation: blobPulse 16s ease-in-out infinite; animation-delay: 8s; }

/* Card */
.auth-card {
  position: relative;
  z-index: 1;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-12) var(--space-10);
  width: 100%;
  max-width: 420px;
  text-align: center;
  box-shadow: var(--shadow-xl);
  animation: slideUp 0.4s ease forwards;
  margin: auto 0;
}

.auth-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  background: var(--accent-light);
  border: 2px solid rgba(88,101,242,0.4);
  border-radius: var(--radius-xl);
  margin: 0 auto var(--space-6);
  color: var(--accent);
}

.auth-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--space-2);
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.auth-subtitle {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-10);
  line-height: 1.6;
}

/* Google sign-in button (brand-compliant) */
.btn-google {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-3) var(--space-6);
  background: #fff;
  color: #3c4043;
  font-family: 'Roboto', var(--font-sans);
  font-size: var(--text-base);
  font-weight: 500;
  border: 1px solid #dadce0;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
  min-height: 48px;
  touch-action: manipulation;
}
.btn-google:hover { background: #f8f9fa; box-shadow: 0 1px 4px rgba(0,0,0,0.3); }
.btn-google:active { transform: scale(0.98); }
.btn-google.loading { pointer-events: none; opacity: 0.7; }

.google-logo {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin: var(--space-8) 0;
  color: var(--text-muted);
  font-size: var(--text-xs);
}
.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.auth-features {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  text-align: left;
}
.auth-feature {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}
.auth-feature-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-hover);
  border-radius: var(--radius-md);
  color: var(--accent);
  flex-shrink: 0;
}

.auth-footer {
  margin-top: var(--space-8);
  font-size: var(--text-xs);
  color: var(--text-muted);
  line-height: 1.6;
}

/* Auth error state */
.auth-error {
  display: none;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--danger-light);
  border: 1px solid rgba(218,55,60,0.3);
  border-radius: var(--radius-md);
  color: var(--danger);
  font-size: var(--text-sm);
  margin-top: var(--space-4);
  text-align: left;
  min-height: 44px;
}
.auth-error.visible { display: flex; }

@keyframes blobPulse {
  0%, 100% { transform: translateZ(0) scale(1); }
  50%       { transform: translateZ(0) scale(1.12); }
}

@media (max-width: 480px) {
  .auth-card { padding: var(--space-8) var(--space-6); border-radius: var(--radius-lg); }
  .auth-title { font-size: var(--text-2xl); }
}

@media (max-height: 720px) {
  #auth-screen { align-items: flex-start; }
  .auth-card { padding: var(--space-6); }
  .auth-logo { width: 56px; height: 56px; margin-bottom: var(--space-4); }
  .auth-subtitle { margin-bottom: var(--space-6); }
  .auth-divider { margin: var(--space-5) 0; }
  .auth-footer { margin-top: var(--space-5); }
}