/* ============================================
   Authentication Page
   ============================================ */

.auth-page {
  min-height: calc(100vh - 68px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5) var(--space-3);
  position: relative;
  overflow: hidden;
}

.auth-bg-rings {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  z-index: 0;
}

.auth-bg-rings .hero-ring:nth-child(1) { width: 300px; height: 300px; }
.auth-bg-rings .hero-ring:nth-child(2) { width: 500px; height: 500px; animation-delay: 0.5s; }
.auth-bg-rings .hero-ring:nth-child(3) { width: 700px; height: 700px; animation-delay: 1s; }

.auth-card {
  width: 100%;
  max-width: 440px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  padding: var(--space-4);
  position: relative;
  z-index: 2;
  box-shadow: 0 12px 48px rgba(15, 23, 42, 0.1), 0 4px 12px rgba(15, 23, 42, 0.06);
}

.auth-card::before { display: none; }

.auth-header {
  text-align: center;
  margin-bottom: var(--space-3);
}

.auth-header .nav-logo-icon {
  margin: 0 auto var(--space-2);
}

.auth-header h2 {
  font-size: 1.6rem;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.auth-header p {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

/* Tab Switcher */
.auth-tabs {
  display: flex;
  background: var(--off-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 4px;
  margin-bottom: var(--space-3);
  position: relative;
}

.auth-tab {
  flex: 1;
  padding: 10px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  position: relative;
  z-index: 1;
}

.auth-tab.active {
  color: var(--white);
  background: var(--blue);
  box-shadow: 0 2px 10px rgba(59, 130, 246, 0.25);
}

/* Form */
.auth-form { display: flex; flex-direction: column; gap: var(--space-2); }
.auth-form.hidden { display: none; }

.form-group { position: relative; }

.form-group label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--blue);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.form-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.form-input-wrapper svg {
  position: absolute;
  left: 14px;
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  z-index: 1;
  pointer-events: none;
  transition: color var(--transition);
}

.form-input {
  width: 100%;
  padding: 12px 16px 12px 44px;
  background: var(--off-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  outline: none;
  transition: all var(--transition);
}

.form-input::placeholder { color: var(--text-muted); }

.form-input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12);
  background: var(--white);
}

.form-input:focus + svg,
.form-input-wrapper:focus-within svg {
  color: var(--blue);
}

.form-toggle-pw {
  position: absolute;
  right: 12px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px;
  display: flex;
  z-index: 1;
}

.form-toggle-pw svg { width: 18px; height: 18px; position: static; }
.form-toggle-pw:hover { color: var(--blue); }

/* Form Options */
.form-options {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
}

.form-check {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.form-check input {
  width: 16px;
  height: 16px;
  accent-color: var(--blue);
  cursor: pointer;
}

.form-link {
  font-size: 0.85rem;
  color: var(--blue);
  font-weight: 600;
}

.form-link:hover { color: var(--blue-glow); }

/* Submit */
.form-submit {
  width: 100%;
  margin-top: var(--space-1);
  padding: 14px;
  justify-content: center;
}

/* Divider */
.form-divider {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: var(--space-2) 0;
}

.form-divider::before,
.form-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.form-divider span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

/* Social Auth */
.social-auth {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-1);
}

.social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--white);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.social-btn:hover {
  border-color: var(--blue-border);
  color: var(--blue);
  background: var(--blue-faint);
}

.social-btn svg { width: 18px; height: 18px; }

/* Auth footer */
.auth-footer-text {
  text-align: center;
  margin-top: var(--space-3);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.auth-footer-text a { font-weight: 600; }

/* Form message */
.form-msg {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  display: none;
}

.form-msg.show { display: block; }

.form-msg.success {
  background: rgba(22, 163, 74, 0.08);
  border: 1px solid rgba(22, 163, 74, 0.25);
  color: var(--success);
}

.form-msg.error {
  background: rgba(220, 38, 38, 0.08);
  border: 1px solid rgba(220, 38, 38, 0.25);
  color: var(--error);
}

/* Password strength bar */
.pw-strength {
  height: 4px;
  border-radius: 2px;
  background: var(--border);
  margin-top: 8px;
  overflow: hidden;
}

.pw-strength-bar {
  height: 100%;
  width: 0;
  border-radius: 2px;
  transition: all 0.3s ease;
}