/* ===== AUTH STYLES ===== */
/* Matches the dark neon aesthetic of aplusassignments.info */

/* ---- Nav Auth Container (sits in header flex row) ---- */
#navAuth {
  display: flex;
  align-items: center;
}

/* ---- Nav Auth Button (Logged Out) ---- */
.nav-auth {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* ---- My Assignments nav link ---- */
.nav-assignments-link {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  white-space: nowrap;
  transition: opacity var(--transition-interactive);
}

.nav-assignments-link:hover {
  opacity: 0.8;
}

.nav-auth .auth-signin-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.45rem 1.2rem;
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: var(--font-body);
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
  border-radius: var(--radius-full);
  background: transparent;
  cursor: pointer;
  transition: background var(--transition-interactive),
              color var(--transition-interactive),
              box-shadow var(--transition-interactive);
  white-space: nowrap;
}

.nav-auth .auth-signin-btn:hover {
  background: var(--color-primary-dim);
  box-shadow: 0 0 20px rgba(0, 255, 136, 0.15);
}

/* ---- Nav Auth (Logged In) — Avatar + Dropdown ---- */
.nav-auth-user {
  position: relative;
  display: flex;
  align-items: center;
}

.nav-auth-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: 2px solid var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text);
  background: var(--color-surface-2);
  cursor: pointer;
  overflow: hidden;
  transition: box-shadow var(--transition-interactive);
}

.nav-auth-avatar:hover {
  box-shadow: 0 0 16px rgba(0, 255, 136, 0.25);
}

.nav-auth-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-full);
}

.nav-auth-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 220px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--transition-interactive),
              transform var(--transition-interactive),
              visibility var(--transition-interactive);
  z-index: 1001;
}

.nav-auth-dropdown.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-auth-dropdown-header {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.nav-auth-dropdown-header .auth-user-name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

.nav-auth-dropdown-header .auth-user-email {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
  word-break: break-all;
}

.nav-auth-dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  transition: background var(--transition-interactive), color var(--transition-interactive);
}

.nav-auth-dropdown-item:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}

a.nav-auth-dropdown-item {
  text-decoration: none;
  color: var(--color-text-muted);
}

a.nav-auth-dropdown-item:hover {
  color: var(--color-text);
}

.nav-auth-dropdown-item.signout {
  color: var(--color-error);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-1);
  padding-top: var(--space-3);
}

.nav-auth-dropdown-item.signout:hover {
  background: rgba(255, 51, 68, 0.08);
  color: var(--color-error);
}

/* ---- Auth Modal Overlay ---- */
.auth-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(5, 5, 7, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 300ms ease, visibility 300ms ease;
}

.auth-modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* ---- Auth Modal Card ---- */
.auth-modal {
  width: 100%;
  max-width: 420px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg), var(--shadow-neon);
  padding: var(--space-8);
  position: relative;
  transform: translateY(24px) scale(0.97);
  transition: transform 300ms cubic-bezier(0.16, 1, 0.3, 1);
  max-height: 90vh;
  overflow-y: auto;
}

.auth-modal-overlay.active .auth-modal {
  transform: translateY(0) scale(1);
}

.auth-modal-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 1.1rem;
  cursor: pointer;
  transition: background var(--transition-interactive), color var(--transition-interactive);
}

.auth-modal-close:hover {
  background: var(--color-border);
  color: var(--color-text);
}

/* ---- Modal Header ---- */
.auth-modal-header {
  text-align: center;
  margin-bottom: var(--space-6);
}

.auth-modal-header h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.auth-modal-header p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 100%;
}

/* ---- Social Login Buttons ---- */
.auth-social-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.auth-social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  width: 100%;
  padding: 0.7rem var(--space-4);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: var(--font-body);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text);
  cursor: pointer;
  transition: background var(--transition-interactive),
              border-color var(--transition-interactive),
              box-shadow var(--transition-interactive);
}

.auth-social-btn:hover {
  background: var(--color-surface-offset);
  border-color: var(--color-text-faint);
}

.auth-social-btn svg {
  flex-shrink: 0;
}

.auth-social-btn.google:hover {
  border-color: #4285f4;
  box-shadow: 0 0 12px rgba(66, 133, 244, 0.12);
}

.auth-social-btn.facebook:hover {
  border-color: #1877f2;
  box-shadow: 0 0 12px rgba(24, 119, 242, 0.12);
}

.auth-social-btn.apple:hover {
  border-color: #a2aaad;
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.06);
}

/* ---- Divider ---- */
.auth-divider {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

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

.auth-divider span {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  white-space: nowrap;
  text-transform: lowercase;
}

/* ---- Auth Form Fields ---- */
.auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.auth-form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.auth-form-group label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.auth-form-group input {
  width: 100%;
  padding: 0.65rem var(--space-4);
  font-size: var(--text-sm);
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}

.auth-form-group input::placeholder {
  color: var(--color-text-faint);
}

.auth-form-group input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-dim);
}

/* ---- Auth Submit Button ---- */
.auth-submit-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  width: 100%;
  padding: 0.75rem var(--space-4);
  font-size: var(--text-sm);
  font-weight: 700;
  font-family: var(--font-body);
  color: var(--color-text-inverse);
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-interactive), box-shadow var(--transition-interactive);
}

.auth-submit-btn:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-neon);
}

.auth-submit-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ---- Forgot Password / Switch Link ---- */
.auth-link-row {
  text-align: center;
  margin-top: var(--space-3);
}

.auth-link-row a,
.auth-link-row button {
  font-size: var(--text-xs);
  color: var(--color-primary);
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  transition: color var(--transition-interactive);
}

.auth-link-row a:hover,
.auth-link-row button:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

.auth-forgot-link {
  display: block;
  text-align: right;
  margin-top: calc(-1 * var(--space-2));
  margin-bottom: var(--space-2);
}

.auth-forgot-link button {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  transition: color var(--transition-interactive);
}

.auth-forgot-link button:hover {
  color: var(--color-primary);
}

/* ---- Auth Messages ---- */
.auth-message {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: 500;
  text-align: center;
  display: none;
}

.auth-message.error {
  display: block;
  background: rgba(255, 51, 68, 0.1);
  border: 1px solid rgba(255, 51, 68, 0.25);
  color: var(--color-error);
}

.auth-message.success {
  display: block;
  background: rgba(0, 255, 136, 0.08);
  border: 1px solid rgba(0, 255, 136, 0.2);
  color: var(--color-primary);
}

/* ---- Loading Spinner ---- */
.auth-spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2.5px solid var(--color-text-inverse);
  border-top-color: transparent;
  border-radius: var(--radius-full);
  animation: authSpin 0.6s linear infinite;
}

.auth-spinner.dark {
  border-color: var(--color-primary);
  border-top-color: transparent;
}

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

.auth-submit-btn .auth-spinner {
  border-color: var(--color-text-inverse);
  border-top-color: transparent;
}

/* ---- Auth View Switching (no JS layout shift) ---- */
.auth-view {
  display: none;
}

.auth-view.active {
  display: block;
}

/* ---- Scrollbar for modal ---- */
.auth-modal::-webkit-scrollbar {
  width: 5px;
}

.auth-modal::-webkit-scrollbar-track {
  background: transparent;
}

.auth-modal::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

/* ===== RESPONSIVE ===== */

/* Tablet */
@media (max-width: 768px) {
  .nav-auth {
    margin-left: 0;
  }

  .nav-auth .auth-signin-btn {
    padding: 0.4rem 0.9rem;
    font-size: var(--text-xs);
  }

  .nav-auth-avatar {
    width: 32px;
    height: 32px;
  }

  .auth-modal {
    max-width: 100%;
    margin: 0 var(--space-4);
    padding: var(--space-6);
  }
}

/* Mobile — slide up from bottom */
@media (max-width: 480px) {
  .auth-modal-overlay {
    align-items: flex-end;
  }

  .auth-modal {
    max-width: 100%;
    margin: 0;
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
    padding: var(--space-6) var(--space-5) var(--space-8);
    max-height: 92vh;
    transform: translateY(100%);
  }

  .auth-modal-overlay.active .auth-modal {
    transform: translateY(0);
  }

  .auth-modal-header h2 {
    font-size: var(--text-lg);
  }
}