/**
 * UPDC MCQ Platform - Component Styles
 * Reusable UI components following UPDC Design System
 */

/* ============================================================
   CARDS
   ============================================================ */

.card {
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-clay-md);
  transition: all var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-clay-lg);
  transform: translateY(-4px);
}

.card--flat {
  box-shadow: var(--shadow-flat-md);
}

.card--flat:hover {
  box-shadow: var(--shadow-flat-lg);
  transform: none;
}

.card--bordered {
  box-shadow: none;
  border: 1px solid var(--color-border);
}

.card--bordered:hover {
  border-color: var(--color-green);
  transform: none;
}

.card--accent-green {
  border-left: 4px solid var(--color-green);
}

.card--accent-lime {
  border-left: 4px solid var(--color-lime);
}

.card--accent-cyan {
  border-left: 4px solid var(--color-cyan);
}

.card--accent-blue {
  border-left: 4px solid var(--color-blue);
}

.card--interactive {
  cursor: pointer;
}

.card--interactive:focus-visible {
  outline: 3px solid var(--color-green);
  outline-offset: 2px;
}

.card--no-hover:hover {
  box-shadow: var(--shadow-clay-md);
  transform: none;
}

.card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.card__title {
  font-size: var(--text-heading-md);
  font-weight: var(--font-weight-semibold);
  margin: 0;
}

.card__subtitle {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}

.card__body {
  color: var(--color-text-secondary);
}

.card__footer {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-body);
  font-size: var(--text-body-md);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* Primary Button */
.btn--primary {
  background: var(--color-green);
  color: var(--color-white);
  border-color: var(--color-green);
  box-shadow: var(--shadow-clay-sm);
}

.btn--primary:hover:not(:disabled) {
  background: var(--color-blue);
  border-color: var(--color-blue);
  box-shadow: var(--shadow-clay-md);
  transform: translateY(-2px);
}

.btn--primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: var(--shadow-inset-sm);
}

.btn--primary:focus-visible {
  outline: 3px solid var(--color-blue);
  outline-offset: 2px;
}

/* Secondary Button */
.btn--secondary {
  background: var(--color-surface-card);
  color: var(--color-text-primary);
  border-color: var(--color-border);
}

.btn--secondary:hover:not(:disabled) {
  background: var(--color-green-light);
  border-color: var(--color-green);
  color: var(--color-green);
}

.btn--secondary:focus-visible {
  outline: 3px solid var(--color-green);
  outline-offset: 2px;
}

/* Ghost Button */
.btn--ghost {
  background: transparent;
  color: var(--color-green);
  border-color: transparent;
}

.btn--ghost:hover:not(:disabled) {
  background: var(--color-green-light);
}

.btn--ghost:focus-visible {
  outline: 3px solid var(--color-green);
  outline-offset: 2px;
}

/* Danger Button */
.btn--danger {
  background: var(--color-error);
  color: var(--color-white);
  border-color: var(--color-error);
}

.btn--danger:hover:not(:disabled) {
  background: #DC2626;
  border-color: #DC2626;
}

.btn--danger:focus-visible {
  outline: 3px solid var(--color-error);
  outline-offset: 2px;
}

/* Button Sizes */
.btn--sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-body-sm);
}

.btn--lg {
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-body-lg);
}

.btn--full {
  width: 100%;
}

/* Button with Icon */
.btn__icon {
  width: 18px;
  height: 18px;
}

.btn--lg .btn__icon {
  width: 22px;
  height: 22px;
}

/* ============================================================
   FORM INPUTS
   ============================================================ */

.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--text-body-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.form-label--required::after {
  content: ' *';
  color: var(--color-error);
}

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-body-md);
  color: var(--color-text-primary);
  background: var(--color-surface-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

.form-input:focus {
  outline: none;
  border-color: var(--color-green);
  box-shadow: var(--shadow-clay-sm), var(--shadow-focus);
}

.form-input:disabled {
  background: var(--color-surface);
  cursor: not-allowed;
  opacity: 0.6;
}

.form-input--error {
  border-color: var(--color-error);
}

.form-input--error:focus {
  box-shadow: var(--shadow-clay-sm), var(--shadow-focus-error);
}

.form-error {
  display: block;
  font-size: var(--text-body-sm);
  color: var(--color-error);
  margin-top: var(--space-2);
}

.form-hint {
  display: block;
  font-size: var(--text-body-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

/* Textarea */
.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* Select */
.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  background-size: 20px;
  padding-right: var(--space-10);
}

/* Static Value (read-only display in forms) */
.form-static-value {
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-body-md);
  color: var(--color-text-primary);
  line-height: var(--line-height-normal);
}

/* Question Count Selector */
.question-count-selector {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Stepper Component */
.stepper {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.stepper__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--color-surface-card);
  border: none;
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.stepper__btn:hover {
  background: var(--color-green-light);
  color: var(--color-green);
}

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

.stepper__input {
  width: 80px;
  height: 44px;
  border: none;
  border-left: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  text-align: center;
  font-size: var(--text-body-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  background: var(--color-surface-card);
  -moz-appearance: textfield;
}

.stepper__input::-webkit-outer-spin-button,
.stepper__input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.all-questions-btn {
  white-space: nowrap;
}

/* Checkbox & Radio */
.form-check {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
}

.form-check__input {
  width: 20px;
  height: 20px;
  accent-color: var(--color-green);
  cursor: pointer;
}

.form-check__label {
  font-size: var(--text-body-md);
  color: var(--color-text-primary);
  cursor: pointer;
}

/* ============================================================
   BADGES
   ============================================================ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-caption);
  font-weight: var(--font-weight-semibold);
  line-height: 1.2;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.badge--lime {
  background: var(--color-lime-light);
  color: var(--color-lime-dark);
}

.badge--green {
  background: var(--color-green-light);
  color: var(--color-green);
}

.badge--cyan {
  background: var(--color-cyan-light);
  color: var(--color-cyan-dark);
}

.badge--blue {
  background: var(--color-blue-light);
  color: var(--color-blue);
}

.badge--warning {
  background: var(--color-warning-bg);
  color: var(--color-warning);
}

.badge--error {
  background: var(--color-error-bg);
  color: var(--color-error);
}

.badge--neutral {
  background: var(--color-surface);
  color: var(--color-text-secondary);
}

/* Status badges */
.badge--enabled {
  background: var(--color-lime-light);
  color: var(--color-lime-dark);
}

.badge--disabled {
  background: var(--color-surface);
  color: var(--color-text-muted);
}

.badge--expired {
  background: var(--color-error-bg);
  color: var(--color-error);
}

/* ============================================================
   PROGRESS BAR
   ============================================================ */

.progress {
  height: 12px;
  background: var(--color-surface);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-inset-sm);
  overflow: hidden;
}

.progress--sm {
  height: 8px;
}

.progress--lg {
  height: 16px;
}

.progress__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-lime) 0%, var(--color-green) 100%);
  border-radius: var(--radius-full);
  transition: width var(--duration-slow) var(--easing-smooth);
}

.progress__fill--success {
  background: var(--color-lime);
}

.progress__fill--warning {
  background: var(--color-warning);
}

.progress__fill--error {
  background: var(--color-error);
}

.progress__fill--cyan {
  background: var(--color-cyan);
}

/* Progress with label */
.progress-labeled {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.progress-labeled .progress {
  flex: 1;
}

.progress-labeled__value {
  font-size: var(--text-body-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  min-width: 45px;
  text-align: right;
}

/* ============================================================
   TABS
   ============================================================ */

.tabs {
  display: flex;
  gap: var(--space-1);
  background: var(--color-surface);
  padding: var(--space-1);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-inset-sm);
}

.tab {
  flex: 1;
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-body-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab:hover:not(.tab--active) {
  color: var(--color-text-primary);
  background: var(--color-surface-card);
}

.tab--active {
  color: var(--color-green);
  background: var(--color-surface-card);
  box-shadow: var(--shadow-clay-sm);
}

.tab-content {
  display: none;
  padding-top: var(--space-6);
}

.tab-content--active {
  display: block;
}

/* ============================================================
   ICON CONTAINER
   ============================================================ */

.icon-container {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-clay-sm);
}

.icon-container--sm {
  width: 36px;
  height: 36px;
}

.icon-container--lg {
  width: 56px;
  height: 56px;
}

.icon-container--lime {
  background: var(--color-lime-light);
  color: var(--color-lime);
}

.icon-container--green {
  background: var(--color-green-light);
  color: var(--color-green);
}

.icon-container--cyan {
  background: var(--color-cyan-light);
  color: var(--color-cyan);
}

.icon-container--blue {
  background: var(--color-blue-light);
  color: var(--color-blue);
}

.icon-container svg {
  width: 24px;
  height: 24px;
}

.icon-container--sm svg {
  width: 18px;
  height: 18px;
}

.icon-container--lg svg {
  width: 28px;
  height: 28px;
}

/* ============================================================
   AVATAR
   ============================================================ */

.avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--color-green);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-semibold);
  font-size: var(--text-body-md);
  text-transform: uppercase;
}

.avatar--sm {
  width: 32px;
  height: 32px;
  font-size: var(--text-body-sm);
}

.avatar--lg {
  width: 56px;
  height: 56px;
  font-size: var(--text-heading-md);
}

.avatar--xl {
  width: 80px;
  height: 80px;
  font-size: var(--text-heading-lg);
}

/* ============================================================
   CALLOUT / ALERT
   ============================================================ */

.callout {
  padding: var(--space-4) var(--space-6);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  border-left: 4px solid;
  margin: var(--space-4) 0;
}

.callout--info {
  background: var(--color-cyan-light);
  border-left-color: var(--color-cyan);
}

.callout--success {
  background: var(--color-lime-light);
  border-left-color: var(--color-lime);
}

.callout--warning {
  background: var(--color-warning-bg);
  border-left-color: var(--color-warning);
}

.callout--error {
  background: var(--color-error-bg);
  border-left-color: var(--color-error);
  color: var(--color-error);
}

.callout--error .callout__content {
  color: #991B1B;
}

.callout__title {
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-1);
}

.callout__content {
  font-size: var(--text-body-sm);
  color: var(--color-text-primary);
}

.callout__content p:last-child {
  margin-bottom: 0;
}

/* ============================================================
   DIVIDER
   ============================================================ */

.divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-6) 0;
  border: none;
}

.divider--strong {
  background: var(--color-border-strong);
}

.divider--vertical {
  width: 1px;
  height: auto;
  margin: 0 var(--space-4);
}

/* ============================================================
   STAT CARD
   ============================================================ */

.stat-card {
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-clay-sm);
}

.stat-card__label {
  font-size: var(--text-caption);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.stat-card__value {
  font-family: var(--font-display);
  font-size: var(--text-display-md);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  line-height: 1;
}

.stat-card__value--green {
  color: var(--color-green);
}

.stat-card__value--lime {
  color: var(--color-lime);
}

.stat-card__value--cyan {
  color: var(--color-cyan);
}

.stat-card__change {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-top: var(--space-2);
  font-size: var(--text-body-sm);
}

.stat-card__change--positive {
  color: var(--color-lime-dark);
}

.stat-card__change--negative {
  color: var(--color-error);
}

/* ============================================================
   SESSION CARD (Knowledge Check)
   ============================================================ */

.session-card {
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-clay-md);
  border-left: 4px solid var(--color-green);
  transition: all var(--transition-normal);
}

.session-card--disabled {
  opacity: 0.6;
  border-left-color: var(--color-border-strong);
  pointer-events: none;
}

.session-card--expired {
  opacity: 0.5;
  border-left-color: var(--color-error);
  pointer-events: none;
}

.session-card:hover:not(.session-card--disabled):not(.session-card--expired) {
  box-shadow: var(--shadow-clay-lg);
  transform: translateY(-2px);
  cursor: pointer;
}

.session-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}

.session-card__title {
  font-size: var(--text-heading-sm);
  font-weight: var(--font-weight-semibold);
  margin: 0;
}

.session-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
}

.session-card__meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* ============================================================
   CHAPTER CARD
   ============================================================ */

.chapter-card {
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-clay-sm);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.chapter-card:hover {
  box-shadow: var(--shadow-clay-md);
  transform: translateY(-2px);
}

.chapter-card__icon {
  flex-shrink: 0;
}

.chapter-card__content {
  flex: 1;
  min-width: 0;
}

.chapter-card__title {
  font-size: var(--text-body-md);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-1);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chapter-card__subtitle {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
}

.chapter-card__progress {
  flex-shrink: 0;
  width: 60px;
  text-align: right;
}

.chapter-card__mastery {
  font-family: var(--font-display);
  font-size: var(--text-heading-md);
  font-weight: var(--font-weight-bold);
  color: var(--color-green);
}

/* ============================================================
   QUIZ OPTION (for MCQ)
   ============================================================ */

.quiz-option {
  background: var(--color-surface);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-body);
  letter-spacing: 0.01em;
}

.quiz-option:hover:not(.quiz-option--selected):not(.quiz-option--disabled) {
  background: var(--color-green-light);
  border-color: var(--color-green);
}

.quiz-option--selected {
  background: var(--color-green-light);
  border-color: var(--color-green);
}

.quiz-option--correct {
  background: var(--color-lime-light);
  border-color: var(--color-lime);
}

.quiz-option--incorrect {
  background: var(--color-error-bg);
  border-color: var(--color-error);
}

.quiz-option--disabled {
  cursor: not-allowed;
  opacity: 0.7;
}

.quiz-option__letter {
  width: 36px;
  height: 36px;
  background: var(--color-surface-card);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-clay-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: var(--text-body-md);
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.quiz-option--selected .quiz-option__letter {
  background: var(--color-green);
  color: var(--color-white);
}

.quiz-option--correct .quiz-option__letter {
  background: var(--color-lime);
  color: var(--color-white);
}

.quiz-option--incorrect .quiz-option__letter {
  background: var(--color-error);
  color: var(--color-white);
}

.quiz-option__text {
  flex: 1;
  padding-top: var(--space-2);
  line-height: var(--line-height-relaxed);
}

/* ============================================================
   STREAK / FIRE INDICATOR
   ============================================================ */

.streak {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-warning-bg);
  border-radius: var(--radius-full);
}

.streak__icon {
  width: 20px;
  height: 20px;
  color: var(--color-warning);
}

.streak__count {
  font-weight: var(--font-weight-bold);
  color: var(--color-warning);
}

/* ============================================================
   TIMER
   ============================================================ */

.timer {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-clay-sm);
}

.timer__icon {
  width: 20px;
  height: 20px;
  color: var(--color-text-secondary);
}

.timer__value {
  font-family: var(--font-mono);
  font-size: var(--text-body-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.timer--warning .timer__value {
  color: var(--color-warning);
}

.timer--danger .timer__value {
  color: var(--color-error);
  animation: pulse 1s ease-in-out infinite;
}

/* ============================================================
   FLASHCARD
   ============================================================ */

.flashcard {
  perspective: 1000px;
  width: 100%;
  max-width: 500px;
  height: 300px;
  cursor: pointer;
}

.flashcard__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform var(--duration-slow) var(--easing-smooth);
  transform-style: preserve-3d;
}

.flashcard--flipped .flashcard__inner {
  transform: rotateY(180deg);
}

.flashcard__front,
.flashcard__back {
  position: absolute;
  inset: 0;
  background: var(--color-surface-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-clay-lg);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  backface-visibility: hidden;
}

.flashcard__back {
  transform: rotateY(180deg);
  background: var(--color-green-light);
}

.flashcard__label {
  font-size: var(--text-caption);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}

.flashcard__content {
  font-family: var(--font-quiz);
  font-size: var(--text-heading-md);
  line-height: var(--line-height-relaxed);
}

.flashcard__back .flashcard__content {
  font-size: var(--text-body-lg);
}

.flashcard__hint {
  position: absolute;
  bottom: var(--space-4);
  font-size: var(--text-caption);
  color: var(--color-text-muted);
}

/* ============================================================
   NAVIGATION COMPONENTS
   ============================================================ */

.nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  background: var(--color-surface-card);
}

.nav-header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.nav-header__logo:hover {
  opacity: 0.8;
}

.nav-header__logo img {
  height: 40px;
  width: auto;
}

.nav-header__title {
  font-family: var(--font-display);
  font-size: var(--text-heading-md);
  font-weight: var(--font-weight-semibold);
  color: var(--color-green);
}

.nav-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-header__user {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav-header__user-info {
  text-align: right;
}

.nav-header__user-name {
  font-weight: var(--font-weight-semibold);
  font-size: var(--text-body-sm);
}

.nav-header__user-role {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
}

/* ============================================================
   RADIO BUTTONS (Custom)
   ============================================================ */

.radio-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.radio-label {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.radio-label:hover {
  border-color: var(--color-green);
  background: var(--color-green-light);
}

.radio-input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.radio-custom {
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border-strong);
  border-radius: 50%;
  flex-shrink: 0;
  position: relative;
  transition: all var(--transition-fast);
  margin-top: 2px;
}

.radio-custom::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  width: 10px;
  height: 10px;
  background: var(--color-green);
  border-radius: 50%;
  transition: all var(--transition-fast);
}

.radio-input:checked + .radio-custom {
  border-color: var(--color-green);
}

.radio-input:checked + .radio-custom::after {
  transform: translate(-50%, -50%) scale(1);
}

.radio-input:focus + .radio-custom {
  box-shadow: var(--shadow-focus);
}

.radio-label:has(.radio-input:checked) {
  border-color: var(--color-green);
  background: var(--color-green-light);
}

.radio-text {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.radio-text strong {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

/* ============================================================
   SPINNER / LOADING
   ============================================================ */

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
  vertical-align: middle;
}

.spinner--lg {
  width: 24px;
  height: 24px;
  border-width: 3px;
}

.spinner--xl {
  width: 40px;
  height: 40px;
  border-width: 4px;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* ============================================================
   LINKS
   ============================================================ */

.link {
  color: var(--color-green);
  text-decoration: none;
  font-weight: var(--font-weight-semibold);
  transition: color var(--transition-fast);
}

.link:hover {
  color: var(--color-blue);
  text-decoration: underline;
}

.link:focus {
  outline: 2px solid var(--color-green);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ============================================================
   AVATAR
   ============================================================ */

.avatar {
  width: 40px;
  height: 40px;
  background: var(--color-green);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: var(--text-body-sm);
  text-transform: uppercase;
  flex-shrink: 0;
}

.avatar--sm {
  width: 32px;
  height: 32px;
  font-size: var(--text-caption);
}

.avatar--lg {
  width: 56px;
  height: 56px;
  font-size: var(--text-body-lg);
}

/* ============================================================
   TEXT UTILITIES
   ============================================================ */

.text-sm {
  font-size: var(--text-body-sm);
}

.text-lg {
  font-size: var(--text-body-lg);
}

/* ============================================================
   DASHBOARD LAYOUT
   ============================================================ */

.dashboard {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-6);
  min-height: calc(100vh - 72px);
  padding: var(--space-6);
  background: var(--color-surface);
}

.dashboard__sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.dashboard__main {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.dashboard__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.dashboard__title {
  font-size: var(--text-display-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin: 0;
}

.dashboard__subtitle {
  font-size: var(--text-body-md);
  color: var(--color-text-secondary);
  margin: var(--space-1) 0 0 0;
}

/* Sidebar Sections */
.sidebar-section {
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-clay-md);
}

.sidebar-section__title {
  font-size: var(--text-caption);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-4) 0;
}

/* Certification Tabs */
.cert-tabs {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.cert-tab {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: var(--space-4);
  background: var(--color-surface);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
  width: 100%;
}

.cert-tab:hover {
  background: var(--color-green-light);
  border-color: var(--color-green);
}

.cert-tab--active {
  background: var(--color-green-light);
  border-color: var(--color-green);
}

.cert-tab__code {
  font-size: var(--text-body-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-green);
}

.cert-tab__name {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
}

/* Quick Actions */
.quick-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.quick-action {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--color-surface);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
  width: 100%;
  font-family: var(--font-body);
  font-size: var(--text-body-md);
  color: var(--color-text-primary);
}

.quick-action:hover {
  background: var(--color-green-light);
  transform: translateX(4px);
}

.quick-action__icon {
  flex-shrink: 0;
}

/* Progress Summary */
.progress-summary {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.progress-summary__item {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.progress-summary__label {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
}

.progress-summary__value {
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

/* Achievements Summary */
.achievements-summary {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* Streak Display */
.streak-display {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: linear-gradient(135deg, var(--color-warning-bg) 0%, rgba(251, 191, 36, 0.1) 100%);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-warning);
}

.streak-display--inactive {
  background: var(--color-surface);
  border-left-color: var(--color-border);
  opacity: 0.7;
}

.streak-display__icon {
  font-size: 1.5rem;
}

.streak-display__info {
  display: flex;
  flex-direction: column;
}

.streak-display__count {
  font-size: var(--text-heading-md);
  font-weight: var(--font-weight-bold);
  color: var(--color-warning);
  line-height: 1;
}

.streak-display__label {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
}

/* Badges Summary */
.badges-summary {
  padding: var(--space-3);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.badges-summary:hover {
  background: var(--color-surface-secondary);
}

.badges-summary__count {
  font-size: var(--text-heading-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-green);
  line-height: 1;
}

.badges-summary__label {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.badges-summary__progress {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.badges-summary__bar {
  flex: 1;
  height: 6px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.badges-summary__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-green), var(--color-lime));
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
}

.badges-summary__text {
  font-size: var(--text-caption);
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
}

.stat-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-clay-sm);
}

.stat-card__icon {
  flex-shrink: 0;
}

.stat-card__content {
  flex: 1;
}

.stat-card__value {
  font-family: var(--font-display);
  font-size: var(--text-display-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  line-height: 1;
}

.stat-card__label {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}

/* Dashboard Sections */
.dashboard-section {
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-clay-md);
}

.dashboard-section__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.dashboard-section__title {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-heading-md);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0;
}

.dashboard-section__title svg {
  color: var(--color-green);
}

.dashboard-section__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Chapters Grid */
.chapters-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

/* Chapter Card (Updated) */
.chapter-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chapter-card:hover {
  background: var(--color-green-light);
  border-color: var(--color-green);
  transform: translateX(4px);
}

.chapter-card__number {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-green);
  color: var(--color-white);
  font-weight: var(--font-weight-bold);
  font-size: var(--text-body-md);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.chapter-card__content {
  flex: 1;
  min-width: 0;
}

.chapter-card__title {
  font-size: var(--text-body-md);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chapter-card__meta {
  display: flex;
  gap: var(--space-4);
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}

.chapter-card__mastery {
  color: var(--color-green);
  font-weight: var(--font-weight-semibold);
}

.chapter-card__stats {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-top: var(--space-2);
  font-family: var(--font-body);
}

.chapter-card__stat {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
  font-family: var(--font-body);
}

.chapter-card__stat--mastery {
  color: var(--color-green);
  font-weight: var(--font-weight-semibold);
  font-family: var(--font-body);
}

.chapter-card__progress {
  width: 80px;
  flex-shrink: 0;
}

.chapter-card__arrow {
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.chapter-card:hover .chapter-card__arrow {
  color: var(--color-green);
}

/* Chapter Tier Badges */
.chapter-tier-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--text-body-xs);
  font-weight: var(--font-weight-semibold);
  font-family: var(--font-body);
  margin-top: var(--space-1);
  width: fit-content;
}

.chapter-tier-badge--proficient {
  background: rgba(74, 222, 128, 0.1);
  color: var(--color-lime);
  border: 1px solid rgba(74, 222, 128, 0.3);
}

.chapter-tier-badge--competent {
  background: rgba(0, 172, 105, 0.1);
  color: var(--color-green);
  border: 1px solid rgba(0, 172, 105, 0.3);
}

.chapter-tier-badge--learning {
  background: rgba(14, 165, 233, 0.1);
  color: var(--color-cyan);
  border: 1px solid rgba(14, 165, 233, 0.3);
}

.chapter-tier-badge--no-placement {
  background: rgba(251, 191, 36, 0.1);
  color: var(--color-warning);
  border: 1px solid rgba(251, 191, 36, 0.3);
}

/* Sessions List */
.sessions-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-10);
  color: var(--color-text-secondary);
}

.empty-state__icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border-radius: 50%;
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
}

.empty-state__icon svg {
  width: 32px;
  height: 32px;
}

.empty-state__title {
  font-size: var(--text-heading-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0 0 var(--space-2) 0;
}

.empty-state__text {
  font-size: var(--text-body-md);
  color: var(--color-text-secondary);
  margin: 0;
  max-width: 300px;
}

/* Form Select Small */
.form-select--sm {
  padding: var(--space-2) var(--space-8) var(--space-2) var(--space-3);
  font-size: var(--text-body-sm);
  background-size: 16px;
  background-position: right var(--space-2) center;
}

/* Progress Bar Small */
.progress--sm {
  height: 6px;
}

/* Responsive Dashboard */
@media (max-width: 1024px) {
  .dashboard {
    grid-template-columns: 1fr;
  }

  .dashboard__sidebar {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-4);
  }

  .sidebar-section {
    flex: 1;
    min-width: 200px;
  }

  .cert-tabs {
    flex-direction: row;
  }

  .cert-tab {
    flex: 1;
  }

  .quick-actions {
    flex-direction: row;
  }

  .quick-action {
    flex: 1;
    flex-direction: column;
    text-align: center;
    padding: var(--space-4);
  }
}

@media (max-width: 768px) {
  .dashboard {
    padding: var(--space-4);
    gap: var(--space-4);
  }

  .dashboard__header {
    flex-direction: column;
    align-items: flex-start;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .sidebar-section {
    min-width: 100%;
  }

  .cert-tabs {
    flex-direction: column;
  }

  .quick-actions {
    flex-direction: column;
  }

  .quick-action {
    flex-direction: row;
    text-align: left;
  }
}

/* ============================================================
   CONTENT MANAGEMENT
   ============================================================ */

.content-management {
  padding: var(--space-8) 0;
}

.page-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.page-header__back {
  margin-bottom: var(--space-2);
}

.page-header__title h1 {
  font-size: var(--text-heading-xl);
  font-weight: var(--font-weight-bold);
  margin: 0;
  color: var(--color-text-primary);
}

/* Inline Certification Tabs */
.cert-tabs-inline {
  display: flex;
  gap: var(--space-2);
  background: var(--color-surface);
  padding: var(--space-1);
  border-radius: var(--radius-lg);
  width: fit-content;
}

.cert-tab-inline {
  padding: var(--space-3) var(--space-5);
  border: none;
  background: transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.cert-tab-inline:hover {
  background: var(--color-surface-hover);
  color: var(--color-text-primary);
}

.cert-tab-inline--active {
  background: var(--color-green);
  color: var(--color-white);
  box-shadow: var(--shadow-flat-sm);
}

.cert-tab-inline--active:hover {
  background: var(--color-green);
  color: var(--color-white);
}

/* Upload Grid */
.upload-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

@media (max-width: 768px) {
  .upload-grid {
    grid-template-columns: 1fr;
  }
}

/* Upload Card */
.upload-card {
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-clay-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.upload-card__icon {
  margin-bottom: var(--space-4);
}

.icon-container--lg {
  width: 64px;
  height: 64px;
}

.icon-container--lg svg {
  width: 32px;
  height: 32px;
}

.upload-card__title {
  font-size: var(--text-heading-md);
  font-weight: var(--font-weight-semibold);
  margin: 0 0 var(--space-2);
}

.upload-card__description {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}

/* Dropzone */
.upload-card__dropzone {
  width: 100%;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.upload-card__dropzone:hover,
.dropzone--active {
  border-color: var(--color-green);
  background: var(--color-green-light);
}

.dropzone__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-secondary);
}

.dropzone__content svg {
  width: 32px;
  height: 32px;
  opacity: 0.5;
}

.dropzone__content p {
  margin: 0;
}

.upload-card__status {
  margin-top: var(--space-4);
  font-size: var(--text-body-sm);
  min-height: 24px;
}

/* Content Table */
.content-table-wrapper {
  overflow-x: auto;
}

.content-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-clay-sm);
}

.content-table th,
.content-table td {
  padding: var(--space-4) var(--space-5);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.content-table th {
  background: var(--color-surface);
  font-weight: var(--font-weight-semibold);
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.content-table tbody tr:hover {
  background: var(--color-surface-hover);
}

.content-table tbody tr:last-child td {
  border-bottom: none;
}

/* Chapter Badge in Table */
.chapter-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--color-green-light);
  color: var(--color-green);
  font-weight: var(--font-weight-bold);
  font-size: var(--text-body-sm);
}

.table-actions {
  display: flex;
  gap: var(--space-2);
}

/* Text Colors */
.text-success {
  color: var(--color-lime);
}

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

.text-error {
  color: var(--color-error);
}

/* ============================================================
   QUIZ STYLES
   ============================================================ */

/* Quiz Config */
.quiz-config {
  padding: var(--space-8) 0;
}

.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--color-green);
}

.checkbox-text {
  color: var(--color-text-primary);
}

.form-actions {
  margin-top: var(--space-6);
}

/* Quiz View */
.quiz-view {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.quiz-header {
  background: var(--color-surface-card);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4) 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.quiz-header__content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.quiz-header__info {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.quiz-header__mode {
  font-weight: var(--font-weight-semibold);
  color: var(--color-green);
}

.quiz-header__cert,
.quiz-header__chapter {
  color: var(--color-text-secondary);
  font-size: var(--text-body-sm);
}

.quiz-header__progress {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.quiz-header__count {
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

.quiz-progress-bar {
  width: 120px;
  height: 8px;
  background: var(--color-surface);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.quiz-progress-bar__fill {
  height: 100%;
  background: var(--color-green);
  transition: width var(--transition-normal);
}

/* Question Navigation (dots) */
.quiz-question-nav {
  background: var(--color-surface);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
}

.quiz-nav__dots {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
}

.quiz-dot {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--color-border);
  background: var(--color-surface-card);
  color: var(--color-text-secondary);
  font-size: var(--text-body-sm);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quiz-dot:hover {
  border-color: var(--color-green);
  color: var(--color-green);
}

.quiz-dot--current {
  border-color: var(--color-green);
  background: var(--color-green);
  color: var(--color-white);
}

.quiz-dot--answered {
  background: var(--color-green-light);
  border-color: var(--color-green);
  color: var(--color-green);
}

.quiz-dot--current.quiz-dot--answered {
  background: var(--color-green);
  color: var(--color-white);
}

/* Quiz Content */
.quiz-content {
  flex: 1;
  padding: var(--space-6) 0;
  padding-bottom: 100px; /* Space for fixed bottom nav */
  background: var(--color-surface);
}

.quiz-question-card {
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-clay-md);
  margin-bottom: var(--space-6);
}

.quiz-question__chapter {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
}

.quiz-question__text {
  font-size: var(--text-heading-md);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-primary);
  margin: 0 0 var(--space-6) 0;
}

/* Quiz Options */
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.quiz-option {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
  width: 100%;
  font-family: var(--font-body);
  letter-spacing: 0.01em;
}

.quiz-option:hover:not(:disabled) {
  border-color: var(--color-green);
  background: var(--color-green-light);
}

.quiz-option:disabled {
  cursor: default;
}

.quiz-option--selected {
  border-color: var(--color-blue);
  background: var(--color-blue-light);
}

.quiz-option--correct {
  border-color: var(--color-lime);
  background: var(--color-lime-light);
}

.quiz-option--incorrect {
  border-color: var(--color-error);
  background: var(--color-error-bg);
}

.quiz-option__letter {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--color-surface-card);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: var(--text-body-md);
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.quiz-option--selected .quiz-option__letter {
  background: var(--color-blue);
  color: var(--color-white);
}

.quiz-option--correct .quiz-option__letter {
  background: var(--color-lime);
  color: var(--color-white);
}

.quiz-option--incorrect .quiz-option__letter {
  background: var(--color-error);
  color: var(--color-white);
}

.quiz-option__text {
  flex: 1;
  padding-top: var(--space-1);
  line-height: var(--line-height-relaxed);
}

.quiz-option__icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.quiz-option--correct .quiz-option__icon {
  color: var(--color-lime);
}

.quiz-option--incorrect .quiz-option__icon {
  color: var(--color-error);
}

/* Quiz Explanation */
.quiz-explanation {
  margin-top: var(--space-6);
  padding: var(--space-5);
  border-radius: var(--radius-md);
  border-left: 4px solid;
}

.quiz-explanation--correct {
  background: var(--color-lime-light);
  border-left-color: var(--color-lime);
}

.quiz-explanation--incorrect {
  background: var(--color-error-bg);
  border-left-color: var(--color-error);
}

.quiz-explanation h4 {
  margin: 0 0 var(--space-2) 0;
  font-weight: var(--font-weight-semibold);
}

.quiz-explanation--correct h4 {
  color: var(--color-lime);
}

.quiz-explanation--incorrect h4 {
  color: var(--color-error);
}

.quiz-explanation p {
  margin: 0;
  color: var(--color-text-primary);
  line-height: var(--line-height-relaxed);
}

/* Quiz Actions */
.quiz-actions {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
}

/* Quiz Fixed Bottom Navigation */
.quiz-bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-surface-card);
  border-top: 1px solid var(--color-border);
  padding: var(--space-4) 0;
  z-index: 100;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
}

.quiz-bottom-nav__inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-4);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-4);
}

.quiz-bottom-nav__btn {
  min-width: 120px;
  width: 120px;
  justify-content: center;
}

/* Quiz Results */
.quiz-results {
  padding: var(--space-8) 0;
}

.results-header {
  text-align: center;
  margin-bottom: var(--space-8);
}

.results-score {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-6);
  box-shadow: var(--shadow-clay-lg);
}

.results-score--passed {
  background: linear-gradient(135deg, var(--color-lime), var(--color-green));
  color: var(--color-white);
}

.results-score--failed {
  background: linear-gradient(135deg, var(--color-warning), var(--color-error));
  color: var(--color-white);
}

.results-score__value {
  font-size: var(--text-display-lg);
  font-weight: var(--font-weight-bold);
  line-height: 1;
}

.results-score__label {
  font-size: var(--text-body-md);
  font-weight: var(--font-weight-semibold);
  margin-top: var(--space-1);
}

.results-title {
  font-size: var(--text-heading-xl);
  margin: 0 0 var(--space-2) 0;
}

.results-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
  padding: var(--space-6);
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-clay-sm);
}

.results-stat {
  text-align: center;
}

.results-stat__value {
  font-size: var(--text-display-sm);
  font-weight: var(--font-weight-bold);
}

.results-stat__label {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}

.results-actions {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Results Questions Review */
.results-questions {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.result-question {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  border-left: 4px solid;
}

.result-question--correct {
  border-left-color: var(--color-lime);
}

.result-question--incorrect {
  border-left-color: var(--color-error);
}

.result-question__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}

.result-question__number {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: var(--color-surface-card);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: var(--text-body-sm);
}

.result-question__status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-body-sm);
  font-weight: var(--font-weight-semibold);
}

.result-question--correct .result-question__status {
  color: var(--color-lime);
}

.result-question--incorrect .result-question__status {
  color: var(--color-error);
}

.result-question__text {
  margin: 0 0 var(--space-4) 0;
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-relaxed);
}

.result-question__answers {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.result-answer {
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-card);
  border-radius: var(--radius-sm);
  font-size: var(--text-body-sm);
  position: relative;
}

.result-answer--correct {
  background: var(--color-lime-light);
  border: 1px solid var(--color-lime);
}

.result-answer--incorrect {
  background: var(--color-error-bg);
  border: 1px solid var(--color-error);
}

.result-answer__marker {
  display: inline-block;
  font-size: var(--text-caption);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  background: var(--color-error);
  color: var(--color-white);
  margin-right: var(--space-2);
}

.result-answer__marker--correct {
  background: var(--color-lime);
}

.result-question__explanation {
  margin-top: var(--space-4);
  padding: var(--space-4);
  background: var(--color-surface-card);
  border-radius: var(--radius-sm);
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* Responsive Quiz */
@media (max-width: 768px) {
  .quiz-header__info {
    display: none;
  }

  .quiz-nav__dots {
    gap: var(--space-1);
  }

  .quiz-dot {
    width: 28px;
    height: 28px;
    font-size: var(--text-caption);
  }

  .quiz-question-card {
    padding: var(--space-5);
  }

  .quiz-question__text {
    font-size: var(--text-body-lg);
  }

  .results-stats {
    flex-wrap: wrap;
    gap: var(--space-4);
  }

  .results-stat {
    flex: 1;
    min-width: 80px;
  }
}

/* Utility Classes */
.ml-4 {
  margin-left: var(--space-4);
}

/* ============================================================
   SESSION MANAGEMENT
   ============================================================ */

/* Session Join Prompt (Participant Dashboard) */
.session-join-prompt {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-clay-sm);
  border: 1px dashed var(--color-border);
}

.session-join-prompt__content {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.session-join-prompt__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-green-light), var(--color-lime-light));
  border-radius: var(--radius-md);
  color: var(--color-green);
}

.session-join-prompt__icon svg {
  width: 24px;
  height: 24px;
}

.session-join-prompt__text h3 {
  margin: 0;
  font-size: var(--text-body-lg);
  font-weight: var(--font-weight-semibold);
}

.session-join-prompt__text p {
  margin: var(--space-1) 0 0 0;
}

/* Session Cards (Instructor Dashboard) */
.sessions-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.session-card {
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-clay-sm);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.session-card:hover {
  box-shadow: var(--shadow-clay-md);
  transform: translateY(-2px);
}

.session-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface-secondary);
  border-bottom: 1px solid var(--color-border);
}

.session-card__code {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.session-code {
  font-family: var(--font-mono);
  font-size: var(--text-body-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-green);
  letter-spacing: 0.15em;
  background: var(--color-green-light);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
}

.session-code-lg {
  font-family: var(--font-mono);
  font-size: var(--text-heading-md);
  font-weight: var(--font-weight-bold);
  color: var(--color-green);
  letter-spacing: 0.15em;
  margin: 0 var(--space-3);
}

.session-card__body {
  padding: var(--space-5);
}

.session-card__title {
  font-size: var(--text-body-lg);
  font-weight: var(--font-weight-semibold);
  margin: 0 0 var(--space-2) 0;
}

.session-card__meta {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-3) 0;
}

.session-card__stats {
  display: flex;
  gap: var(--space-4);
  font-size: var(--text-body-sm);
  color: var(--color-text-muted);
}

.session-card__actions {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-secondary);
}

/* Status Badges */
.status-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-caption);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.status-badge--draft {
  background: var(--color-text-muted);
  background: rgba(107, 114, 128, 0.15);
  color: var(--color-text-secondary);
}

.status-badge--active {
  background: rgba(132, 204, 22, 0.15);
  color: var(--color-lime);
}

.status-badge--closed {
  background: rgba(6, 182, 212, 0.15);
  color: var(--color-cyan);
}

.status-badge--archived {
  background: rgba(59, 130, 246, 0.15);
  color: var(--color-blue);
}

/* Rank Badge */
.rank-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  font-size: var(--text-caption);
  font-weight: var(--font-weight-semibold);
  background: var(--color-surface-secondary);
  color: var(--color-text-secondary);
}

.rank-badge--top {
  background: linear-gradient(135deg, var(--color-lime), var(--color-green));
  color: white;
}

/* ============================================================
   MODAL
   ============================================================ */

.modal-container {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
}

.modal-container--active {
  display: block;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  animation: fadeIn 0.2s ease;
}

.modal {
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.modal__header h2 {
  margin: 0;
  font-size: var(--text-heading-md);
}

.modal__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  background: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.modal__close:hover {
  background: var(--color-surface-secondary);
  color: var(--color-text-primary);
}

.modal__body {
  padding: var(--space-6);
}

.modal__footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-secondary);
}

/* Confirm Modal (smaller, centered) */
.modal--confirm {
  max-width: 420px;
}

.modal--confirm .modal__header {
  padding: var(--space-5) var(--space-6) 0;
  border-bottom: none;
}

.modal--confirm .modal__title {
  font-size: var(--text-heading-sm);
  color: var(--color-text-primary);
  margin: 0;
}

.modal--confirm .modal__body {
  padding: var(--space-3) var(--space-6) var(--space-5);
}

.modal--confirm .modal__body p {
  margin: 0;
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.modal--confirm .modal__footer {
  background: transparent;
  border-top: none;
  padding: 0 var(--space-6) var(--space-5);
}

/* Form Row (two columns) */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

@media (max-width: 480px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

/* Form textarea */
.form-textarea {
  width: 100%;
  padding: var(--space-3);
  font-family: inherit;
  font-size: var(--text-body-md);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-primary);
  background: var(--color-surface-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  resize: vertical;
  min-height: 80px;
  transition: all var(--transition-fast);
}

.form-textarea:focus {
  outline: none;
  border-color: var(--color-green);
  box-shadow: 0 0 0 3px var(--color-green-light);
}

/* Button extra small */
.btn--xs {
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-caption);
  min-width: auto;
}

/* Join Session View */
.join-session {
  min-height: calc(100vh - 80px);
  padding: var(--space-8) 0;
}

.join-session .form-input--lg {
  height: 64px;
}

/* Session Detail View */
.session-detail {
  min-height: calc(100vh - 80px);
  padding: var(--space-6) 0;
  background: var(--color-surface-secondary);
}

/* Page Header with Actions */
.page-header__actions {
  display: flex;
  gap: var(--space-3);
}

/* Text centering utility */
.text-center {
  text-align: center;
}

/* Responsive Sessions */
@media (max-width: 768px) {
  .session-join-prompt {
    flex-direction: column;
    text-align: center;
    gap: var(--space-4);
  }

  .session-join-prompt__content {
    flex-direction: column;
  }

  .session-card__header {
    flex-direction: column;
    gap: var(--space-3);
    align-items: flex-start;
  }

  .session-card__actions {
    flex-wrap: wrap;
  }

  .modal {
    margin: var(--space-4);
    max-height: calc(100vh - var(--space-8));
  }

  .page-header__actions {
    margin-top: var(--space-4);
    width: 100%;
  }

  .page-header__actions .btn {
    flex: 1;
  }
}

/* ============================================================
   FLASHCARD STYLES
   ============================================================ */

/* Flashcard Config */
.flashcards-config {
  padding: var(--space-8) 0;
}

.flashcard-chapter-option {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  cursor: pointer;
  transition: all var(--transition-fast);
  border-radius: var(--radius-md);
}

.flashcard-chapter-option:hover {
  background: var(--color-green-light);
}

.flashcard-chapter-option__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-lime), var(--color-green));
  border-radius: var(--radius-md);
  color: white;
}

.flashcard-chapter-option__content {
  flex: 1;
}

.flashcard-chapter-option__content h3 {
  margin: 0;
  font-size: var(--text-body-lg);
  font-weight: var(--font-weight-semibold);
}

.flashcard-chapter-option__content p {
  margin: var(--space-1) 0 0 0;
}

.flashcard-chapter-option__count {
  font-weight: var(--font-weight-semibold);
  color: var(--color-green);
  font-size: var(--text-body-sm);
}

.flashcard-chapter-option__arrow {
  color: var(--color-text-muted);
}

/* Disabled chapter card */
.chapter-card--disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.chapter-card--disabled:hover {
  background: var(--color-surface);
  border-color: transparent;
  transform: none;
}

/* Flashcard Session View - Fixed Layout */
.flashcard-view {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
}

.flashcard-header {
  background: var(--color-surface-card);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4) 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.flashcard-header__content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.flashcard-header__progress {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.flashcard-header__count {
  font-weight: var(--font-weight-bold);
}

.flashcard-header__stats {
  display: flex;
  gap: var(--space-3);
}

.flashcard-stat {
  font-size: var(--text-body-sm);
  font-weight: var(--font-weight-medium);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}

.flashcard-stat--success {
  background: var(--color-lime-light);
  color: var(--color-lime);
}

.flashcard-stat--warning {
  background: var(--color-warning-bg);
  color: var(--color-warning);
}

/* Flashcard Content - Scrollable Area */
.flashcard-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: var(--space-8) var(--space-4);
  padding-bottom: 200px; /* Space for fixed bottom controls */
  overflow-y: auto;
}

/* Flashcard Card - 3D Flip Animation */
.flashcard-card {
  perspective: 1000px;
  -webkit-perspective: 1000px;
  cursor: pointer;
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
}

.flashcard-card__inner {
  position: relative;
  width: 100%;
  height: 320px;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  -webkit-transition: -webkit-transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.flashcard-card--flipped .flashcard-card__inner {
  transform: rotateY(180deg);
  -webkit-transform: rotateY(180deg);
}

.flashcard-card__front,
.flashcard-card__back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  background: var(--color-surface-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-clay-lg);
  text-align: center;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  -moz-backface-visibility: hidden;
  overflow-y: auto;
}

.flashcard-card__front {
  z-index: 2;
  transform: rotateY(0deg);
  -webkit-transform: rotateY(0deg);
}

.flashcard-card__back {
  z-index: 1;
  transform: rotateY(180deg);
  -webkit-transform: rotateY(180deg);
  background: linear-gradient(135deg, var(--color-surface-card) 0%, var(--color-green-light) 100%);
  border-left: 4px solid var(--color-green);
}

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.flashcard-card__label {
  font-size: var(--text-caption);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.flashcard-card__text {
  font-size: var(--text-body-lg);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-primary);
}

.flashcard-card__hint {
  margin-top: var(--space-4);
  font-size: var(--text-body-sm);
  color: var(--color-text-muted);
}

/* Fixed Bottom Controls */
.flashcard-bottom-controls {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-surface-card);
  border-top: 1px solid var(--color-border);
  padding: var(--space-4) 0;
  z-index: 100;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
}

.flashcard-bottom-controls__inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* Progress Bar in Bottom Controls */
.flashcard-progress-bar {
  margin-bottom: var(--space-4);
}

.flashcard-progress-bar__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-2);
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
}

.flashcard-progress-bar__track {
  height: 6px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.flashcard-progress-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-green), var(--color-lime));
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
}

/* Rating and Navigation in Bottom */
.flashcard-rating {
  text-align: center;
  margin-bottom: var(--space-4);
}

.flashcard-rating__prompt {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: var(--text-body-sm);
}

.flashcard-rating__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.flashcard-rating__btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: var(--text-body-md);
  font-weight: var(--font-weight-medium);
  transition: opacity 0.2s;
}

.flashcard-rating__btn:hover {
  opacity: 0.8;
}

.flashcard-rating__btn--review {
  color: var(--color-warning);
}

.flashcard-rating__btn--knew {
  color: var(--color-green);
}

.flashcard-rating__btn--active {
  font-weight: var(--font-weight-bold);
}

/* Button variants for flashcards */
.btn--success {
  background: var(--color-lime);
  color: white;
  border-color: var(--color-lime);
}

.btn--success:hover {
  background: var(--color-green);
  border-color: var(--color-green);
}

.btn--warning {
  background: var(--color-warning);
  color: white;
  border-color: var(--color-warning);
}

.btn--warning:hover {
  background: #d97706;
  border-color: #d97706;
}

/* Navigation */
.flashcard-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-4);
}

.flashcard-nav__btn {
  min-width: 120px;
  width: 120px;
  justify-content: center;
}

.flashcard-nav__btn--finish {
  min-width: 120px;
  width: 120px;
}

/* Flashcard Results */
.flashcard-results {
  padding: var(--space-8) 0;
}

.review-cards-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-height: 300px;
  overflow-y: auto;
}

.review-card-item {
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-warning);
}

/* Chapter Detail Styles */
.chapter-detail {
  padding: var(--space-8) 0;
}

.chapter-detail__badge {
  display: inline-block;
  background: var(--color-green-light);
  color: var(--color-green);
  font-size: var(--text-body-sm);
  font-weight: var(--font-weight-semibold);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-2);
}

.chapter-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-4);
}

.study-options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-4);
}

.study-option-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-clay-md);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.study-option-card:hover {
  box-shadow: var(--shadow-clay-lg);
  transform: translateY(-2px);
}

.study-option-card--disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.study-option-card--disabled:hover {
  transform: none;
  box-shadow: var(--shadow-clay-md);
}

.study-option-card__content {
  flex: 1;
}

.study-option-card__content h3 {
  margin: 0 0 var(--space-1) 0;
  font-size: var(--text-body-lg);
}

.study-option-card__content p {
  margin: 0;
  font-size: var(--text-body-sm);
}

.study-option-card__arrow {
  color: var(--color-text-muted);
}

/* Responsive Flashcards */
@media (max-width: 768px) {
  .flashcard-header__stats {
    display: none;
  }

  .flashcard-card__front {
    min-height: 150px;
    padding: var(--space-4) var(--space-5);
  }

  .flashcard-card__back {
    min-height: 100px;
    padding: var(--space-4) var(--space-5);
  }

  .flashcard-card__text {
    font-size: var(--text-body-md);
  }

  .flashcard-content {
    padding-bottom: 220px;
  }

  .flashcard-rating__buttons {
    flex-direction: row;
  }

  .flashcard-rating__buttons .btn {
    flex: 1;
    padding: var(--space-3) var(--space-2);
    font-size: var(--text-body-sm);
  }

  .flashcard-nav {
    flex-wrap: wrap;
  }

  .study-options-grid {
    grid-template-columns: 1fr;
  }

  .chapter-stats {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ============================================================
   ANALYTICS VIEW
   ============================================================ */

.analytics-view {
  padding: var(--space-8) 0;
}

/* Analytics Stats Grid */
.analytics-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
}

.analytics-stat-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-clay-md);
}

.analytics-stat-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.analytics-stat-card__icon svg {
  width: 32px;
  height: 32px;
}

.analytics-stat-card__value {
  font-size: var(--text-heading-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  line-height: 1;
}

.analytics-stat-card__label {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}

/* Analytics Grid */
.analytics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: var(--space-6);
}

/* Analytics Section */
.analytics-section {
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-clay-md);
}

.analytics-section__title {
  font-size: var(--text-heading-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0 0 var(--space-4) 0;
}

/* Weekly Summary */
.weekly-summary-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.weekly-summary__goal-label {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.weekly-summary__goal-progress {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.weekly-summary__goal-bar {
  flex: 1;
  height: 8px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.weekly-summary__goal-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-green), var(--color-lime));
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
}

.weekly-summary__goal-text {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.weekly-summary__days {
  display: flex;
  justify-content: space-between;
  gap: var(--space-2);
}

.weekly-day {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  flex: 1;
}

.weekly-day__label {
  font-size: var(--text-caption);
  color: var(--color-text-muted);
  text-transform: uppercase;
}

.weekly-day__indicator {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
}

.weekly-day--active .weekly-day__indicator {
  background: var(--color-green);
  border-color: var(--color-green);
}

.weekly-day__count {
  font-size: var(--text-caption);
  font-weight: var(--font-weight-bold);
  color: var(--color-green);
}

/* Certification Progress */
.cert-progress-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.cert-progress__score {
  text-align: center;
  padding: var(--space-4);
  background: linear-gradient(135deg, var(--color-green-light) 0%, rgba(132, 204, 22, 0.1) 100%);
  border-radius: var(--radius-md);
}

.cert-progress__score-value {
  font-size: var(--text-heading-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-green);
  line-height: 1;
}

.cert-progress__score-label {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}

.cert-progress__stats {
  display: flex;
  gap: var(--space-4);
}

.cert-progress__stat {
  flex: 1;
  text-align: center;
  padding: var(--space-3);
  background: var(--color-surface);
  border-radius: var(--radius-md);
}

.cert-progress__stat-value {
  display: block;
  font-size: var(--text-heading-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

.cert-progress__stat-label {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
}

.cert-progress__recommendations {
  padding: var(--space-3);
  background: var(--color-warning-bg);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-warning);
}

.cert-progress__recommendations h4 {
  font-size: var(--text-body-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0 0 var(--space-2) 0;
}

.cert-progress__recommendations ul {
  margin: 0;
  padding-left: var(--space-4);
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
}

.cert-progress__recommendations li {
  margin-bottom: var(--space-1);
}

/* Badges Grid */
.badges-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.badge-category {
  background: var(--color-surface-card);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-clay-md);
}

.badge-category__title {
  font-size: var(--text-body-md);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0 0 var(--space-4) 0;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-category__badges {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-3);
}

.badge-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.badge-item--earned {
  background: linear-gradient(135deg, var(--color-green-light) 0%, rgba(132, 204, 22, 0.05) 100%);
  border: 1px solid var(--color-green-light);
}

.badge-item--locked {
  opacity: 0.6;
}

.badge-item__icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-card);
  border-radius: var(--radius-full);
  color: var(--color-green);
}

.badge-item--locked .badge-item__icon {
  color: var(--color-text-muted);
}

.badge-item__icon svg {
  width: 20px;
  height: 20px;
}

.badge-item__name {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  font-size: var(--text-body-sm);
}

.badge-item__description {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
  .analytics-grid {
    grid-template-columns: 1fr;
  }

  .analytics-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .badge-category__badges {
    grid-template-columns: 1fr;
  }
}