/* ============================================================
   SHARED COMPONENTS
   ============================================================ */

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 28px;
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
  line-height: 1.4;
}

.btn:active {
  transform: scale(0.95);
}

.btn-primary {
  background: var(--brand-green);
  color: #FFFFFF;
}

.btn-primary:hover {
  background: var(--brand-green-accent);
  color: #FFFFFF;
}

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

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--brand-green);
  color: var(--brand-green);
  background: var(--brand-green-dim);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 12px 20px;
}

.btn-ghost:hover {
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.05);
}

.btn-danger {
  background: var(--danger);
  color: #fff;
}

.btn-danger:hover {
  background: #ef4444;
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.82rem;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1rem;
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-full);
}

/* ---------- Cards ---------- */
.card {
  background: linear-gradient(145deg, var(--surface), rgba(255, 255, 255, 0.4));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  backdrop-filter: blur(10px);
  transition: border-color 0.2s ease;
}

.card-hover:hover {
  border-color: rgba(0, 0, 0, 0.15);
}

.card-glow {
  border-color: rgba(2, 5, 51, 0.2);
}

/* ---------- Badges ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
}

/* Difficulty Levels (Transparent with #040534 in light theme, #A9EAFF in dark theme) */
.badge-beginner,
.badge-intermediate,
.badge-advanced {
  background: transparent !important;
  color: #040534 !important;
  border: 1px solid #040534 !important;
}

[data-theme="dark"] .badge-beginner,
[data-theme="dark"] .badge-intermediate,
[data-theme="dark"] .badge-advanced {
  background: transparent !important;
  color: #A9EAFF !important;
  border: 1px solid #A9EAFF !important;
}

.badge-brand,
.badge-primary {
  background: var(--brand-green-dim);
  color: var(--brand-green);
  border-color: transparent;
}

.badge-success {
  background: rgba(16, 185, 129, 0.12);
  color: #059669;
  border-color: transparent;
}

.badge-warning {
  background: rgba(245, 158, 11, 0.12);
  color: #D97706;
  border-color: transparent;
}

.badge-danger {
  background: rgba(248, 113, 113, 0.12);
  color: #DC2626;
  border-color: transparent;
}

.badge-info {
  background: rgba(96, 165, 250, 0.12);
  color: #2563EB;
  border-color: transparent;
}

.badge-ghost {
  background: var(--surface);
  color: var(--text-muted);
  border-color: var(--border-light);
}

/* ---------- Progress Bar ---------- */
.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--brand-green-accent), var(--brand-green));
  border-radius: var(--radius-full);
  position: relative;
  transition: width 1s ease;
}

.progress-bar-fill::after {
  content: '';
  position: absolute;
  right: 0;
  top: -2px;
  bottom: -2px;
  width: 12px;
  background: var(--brand-green);
  border-radius: var(--radius-full);
  box-shadow: 0 0 10px rgba(2, 5, 51, 0.5);
}

/* ---------- Inputs ---------- */
.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.input-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.92rem;
  transition: all var(--transition-fast);
}

.input:focus {
  border-color: var(--brand-green);
  box-shadow: 0 0 0 3px rgba(2, 5, 51, 0.1);
}

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

.input-error {
  border-color: var(--danger) !important;
  box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.1) !important;
}

.input-icon-wrapper {
  position: relative;
}

.input-icon-wrapper .input {
  padding-left: 44px;
}

.input-icon-wrapper i,
.input-icon-wrapper svg {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  width: 18px;
  height: 18px;
}

/* ---------- Avatar ---------- */
.avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--brand-green), var(--brand-green-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--bg-dark);
  flex-shrink: 0;
  overflow: hidden;
  position: relative;
}

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

.avatar-sm {
  width: 32px;
  height: 32px;
  font-size: 0.72rem;
}

.avatar-lg {
  width: 56px;
  height: 56px;
  font-size: 1.1rem;
}

.avatar-xl {
  width: 72px;
  height: 72px;
  font-size: 1.4rem;
}

/* Toast Notification */
.toast-notification {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  border-radius: var(--radius-lg);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.88rem;
  font-weight: 500;
  z-index: 9999;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.toast-notification.show {
  transform: translateY(0);
  opacity: 1;
}

.toast-notification.success {
  border-left: 4px solid var(--brand-green);
}

.toast-notification.danger {
  border-left: 4px solid var(--danger);
}

/* ---------- Divider ---------- */
.divider {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  color: var(--text-muted);
  font-size: 0.82rem;
  margin: var(--space-lg) 0;
}

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

/* ---------- Checkbox ---------- */
.checkbox-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
  display: grid;
  place-content: center;
  transition: all var(--transition-fast);
  position: relative;
}

.checkbox-group input[type="checkbox"]:hover {
  border-color: var(--brand-green);
  box-shadow: 0 0 8px rgba(2, 5, 51, 0.2);
}

.checkbox-group input[type="checkbox"]:checked {
  background: var(--brand-green);
  border-color: var(--brand-green);
  box-shadow: 0 0 12px rgba(2, 5, 51, 0.4);
}

.checkbox-group input[type="checkbox"]::before {
  content: "";
  width: 10px;
  height: 10px;
  transform: scale(0);
  transition: 120ms transform ease-in-out;
  background-color: #FFFFFF;
  clip-path: polygon(14% 44%, 0 58%, 38% 95%, 100% 16%, 86% 2%, 38% 68%);
}

.checkbox-group input[type="checkbox"]:checked::before {
  transform: scale(1);
}

.checkbox-group label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  cursor: pointer;
}

/* ---------- Tag / Pill ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: 0.72rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  background: rgba(0, 0, 0, 0.05);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

/* ---------- Tooltip ---------- */
.tooltip {
  position: relative;
}

.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--text-primary);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.tooltip:hover::after {
  opacity: 1;
}

/* ---------- Social Button ---------- */
.btn-social {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  width: 100%;
  padding: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-social:hover {
  background: var(--surface-hover);
  border-color: var(--border-light);
}

.btn-social svg {
  width: 20px;
  height: 20px;
}

/* ---------- Password Strength ---------- */
.password-strength {
  display: flex;
  gap: 4px;
  margin-top: 4px;
}

.password-strength-bar {
  flex: 1;
  height: 3px;
  background: var(--border);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast);
}

.password-strength-bar.active.weak {
  background: var(--danger);
}

.password-strength-bar.active.medium {
  background: var(--warning);
}

.password-strength-bar.active.strong {
  background: var(--brand-green);
}

.password-strength-text {
  font-size: 0.72rem;
  margin-top: 4px;
  color: var(--text-muted);
}

/* ---------- Notification Dot ---------- */
.notification-dot {
  position: relative;
}

.notification-dot::after {
  content: '';
  position: absolute;
  top: -2px;
  right: -2px;
  width: 8px;
  height: 8px;
  background: var(--brand-green);
  border-radius: var(--radius-full);
  border: 2px solid var(--surface);
}

/* ---------- Skeleton Loader ---------- */
.skeleton {
  background: linear-gradient(90deg, var(--surface) 25%, var(--surface-hover) 50%, var(--surface) 75%);
  background-size: 400% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

/* ---------- Empty State ---------- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-4xl) var(--space-lg);
  text-align: center;
}

.empty-state svg {
  width: 64px;
  height: 64px;
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
}

/* ---------- Universal Toggle Switch ---------- */
.toggle-switch {
  position: relative;
  width: 48px;
  height: 26px;
  cursor: pointer;
  display: inline-block;
  flex-shrink: 0;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 2px;
  width: 20px;
  height: 20px;
  background: #FFFFFF;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
  transition: transform var(--transition-fast);
}

.toggle-switch input:checked + .toggle-slider {
  background: var(--brand-green);
  border-color: var(--brand-green);
}

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(22px);
  background: #FFFFFF;
}

.toggle-switch:hover .toggle-slider {
  border-color: #9CA3AF;
}

.toggle-switch:hover input:checked + .toggle-slider {
  filter: brightness(1.15);
}

[data-theme="dark"] .toggle-slider {
  background: #1E293B;
  border-color: #334155;
}

[data-theme="dark"] .toggle-slider::before {
  background: #94A3B8;
}

[data-theme="dark"] .toggle-switch input:checked + .toggle-slider {
  background: #B1EAFF;
  border-color: #B1EAFF;
}

[data-theme="dark"] .toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(22px);
  background: #0B1120;
}

/* Dark Theme Component Overrides */
[data-theme="dark"] .btn-primary {
  background: #A9EAFF;
  color: #0A303F;
}

[data-theme="dark"] .btn-primary:hover {
  background: #7EDDFF;
  color: #041B24;
}

[data-theme="dark"] .btn-outline {
  color: var(--text-primary);
  border-color: #26334D;
}

[data-theme="dark"] .btn-outline:hover {
  border-color: #A9EAFF;
  color: #A9EAFF;
  background: rgba(169, 234, 255, 0.15);
}

[data-theme="dark"] .btn-ghost {
  color: var(--text-secondary);
}

[data-theme="dark"] .btn-ghost:hover {
  color: #A9EAFF;
  background: rgba(169, 234, 255, 0.12);
}