/* ============================================================
   Auth Screen — Styles
   Biometric prompt, vault code entry, setup flow
   ============================================================ */

.auth-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  background-color: var(--surface-0);
  padding: var(--space-xl);
  padding-top: var(--safe-area-top);
  padding-bottom: var(--safe-area-bottom);
}

/* --- Lock Icon / Branding --- */
.auth-icon {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--accent-primary), #ff6b00);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-xl);
  box-shadow: 0 8px 32px rgba(255, 159, 10, 0.3);
}

.auth-icon svg {
  width: 40px;
  height: 40px;
  fill: white;
}

/* --- Auth Title --- */
.auth-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  text-align: center;
}

.auth-subtitle {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  text-align: center;
}

/* --- Vault Code Input --- */
.vault-input-wrapper {
  width: 100%;
  max-width: 320px;
  margin-bottom: var(--space-lg);
}

.vault-input {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  background-color: var(--surface-3);
  border: 2px solid var(--surface-5);
  border-radius: var(--radius-md);
  font-size: var(--font-size-lg);
  color: var(--text-primary);
  text-align: center;
  letter-spacing: 2px;
  transition: border-color var(--transition-normal);
}

.vault-input:focus {
  border-color: var(--accent-primary);
}

.vault-input.error {
  border-color: var(--accent-danger);
  animation: shake 0.4s ease;
}

/* --- Entropy Meter --- */
.entropy-meter {
  width: 100%;
  max-width: 320px;
  margin-bottom: var(--space-md);
}

.entropy-bar {
  height: 4px;
  border-radius: 2px;
  background-color: var(--surface-4);
  overflow: hidden;
  margin-bottom: var(--space-xs);
}

.entropy-fill {
  height: 100%;
  border-radius: 2px;
  /* Default fill colour (JS drives width; goes green past the entropy floor). */
  background-color: var(--accent-primary);
  transition: width var(--transition-normal), background-color var(--transition-normal);
  width: 0%;
}

.entropy-fill.weak { background-color: var(--accent-danger); }
.entropy-fill.fair { background-color: #ff9f0a; }
.entropy-fill.good { background-color: #ffd60a; }
.entropy-fill.strong { background-color: var(--accent-secondary); }

.entropy-label {
  font-size: var(--font-size-xs);
  color: var(--text-tertiary);
  text-align: center;
}

/* --- Auth Button --- */
.auth-btn {
  width: 100%;
  max-width: 320px;
  padding: var(--space-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--text-inverse);
  background: linear-gradient(135deg, var(--accent-primary), #ff6b00);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.auth-btn:active {
  transform: scale(0.97);
}

.auth-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* --- Biometric Button --- */
.biometric-btn {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-full);
  background-color: var(--surface-3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: var(--space-lg);
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.biometric-btn:active {
  transform: scale(0.9);
  background-color: var(--surface-4);
}

.biometric-btn svg {
  width: 32px;
  height: 32px;
  fill: var(--text-primary);
}

/* --- Lockout State --- */
.lockout-message {
  font-size: var(--font-size-sm);
  color: var(--accent-danger);
  text-align: center;
  margin-top: var(--space-md);
}

.lockout-timer {
  font-weight: var(--font-weight-semibold);
  font-variant-numeric: tabular-nums;
}

/* --- Loading Spinner --- */
.auth-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--surface-4);
  border-top-color: var(--accent-primary);
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
  margin: var(--space-lg) auto;
}

/* --- Setup fields (first run) --- */
.setup-fields {
  width: 100%;
  max-width: 320px;
}

/* --- Error / status line --- */
.auth-error {
  font-size: var(--font-size-sm);
  color: var(--accent-danger);
  text-align: center;
  margin-bottom: var(--space-md);
  max-width: 320px;
}

/* --- Safety number verification (spec §2) --- */
.safety-number {
  width: 100%;
  max-width: 360px;
  margin-top: var(--space-lg);
  text-align: center;
}

.safety-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.safety-hint {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.safety-digits {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--font-size-lg);
  letter-spacing: 1px;
  line-height: var(--line-height-normal);
  color: var(--accent-secondary);
  background-color: var(--surface-2);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  word-spacing: 4px;
}

/* --- Animations --- */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(5px); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}