/* ==========================================================================
   PMP PrepQuiz - Coursera-Inspired Minimalist Professional Design System
   Linear geometric shapes, zero rounded cartoon borders, high readability on mobile
   ========================================================================== */

:root {
  /* Coursera Academic Palette */
  --coursera-blue: #0056D2;
  --coursera-blue-hover: #00419E;
  --coursera-blue-active: #002D6E;
  --coursera-blue-light: #EDF4FD;
  --coursera-blue-border: #BCD5F5;

  --coursera-text-primary: #1F1F1F;
  --coursera-text-secondary: #4A4D50;
  --coursera-text-muted: #6A6F73;
  --coursera-text-disabled: #9FA4A8;

  --coursera-bg-page: #F5F7F8;
  --coursera-bg-card: #FFFFFF;
  --coursera-bg-subtle: #FAFBFC;
  --coursera-border: #D1D7DC;
  --coursera-border-dark: #A1A7AC;

  /* Status Colors */
  --coursera-success: #0F8444;
  --coursera-success-bg: #EDF7EE;
  --coursera-success-border: #9ED4B1;
  --coursera-success-text: #0B5C30;

  --coursera-error: #C5221F;
  --coursera-error-bg: #FDE8E8;
  --coursera-error-border: #F7B5B5;
  --coursera-error-text: #8C1815;

  --coursera-warning: #B06000;
  --coursera-warning-bg: #FEF7E0;
  --coursera-warning-border: #FCE198;
  --coursera-warning-text: #613600;

  /* Typography */
  --font-main: 'Source Sans 3', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Linear Shapes - Zero or Subtle Border Radius */
  --radius-none: 0px;
  --radius-subtle: 2px;
  --radius-pill: 2px;

  /* Shadows */
  --shadow-flat: none;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-popup: 0 4px 16px rgba(0, 0, 0, 0.12);

  --transition-fast: 0.15s ease-in-out;

  /* Aliases & Fallbacks */
  --primary: var(--coursera-blue);
  --success: var(--coursera-success);
  --danger: var(--coursera-error);
  --warning: var(--coursera-warning);
}

/* ==========================================================================
   Base & Reset
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  min-height: 100%;
  font-family: var(--font-main);
  background-color: var(--coursera-bg-page);
  color: var(--coursera-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Confetti Fullscreen Overlay */
#confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 9999;
}

/* ==========================================================================
   Layout Containers
   ========================================================================== */

.app-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 16px 36px;
}

/* Coursera Minimal Flat Card */
.glass-panel {
  background: var(--coursera-bg-card);
  border: 1px solid var(--coursera-border);
  border-radius: var(--radius-none);
  box-shadow: var(--shadow-card);
}

/* ==========================================================================
   Header Component (Coursera Academic Navbar)
   ========================================================================== */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  margin: 16px 0 24px;
  background: #ffffff;
  border: 1px solid var(--coursera-border);
  border-left: 4px solid var(--coursera-blue);
  border-radius: var(--radius-none);
}

.brand-container {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
}

.brand-container:hover .brand-title {
  color: var(--coursera-blue);
}

.logo-shield {
  width: 32px;
  height: 32px;
  background: var(--coursera-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  border-radius: var(--radius-none);
}

.logo-shield svg {
  width: 18px;
  height: 18px;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--coursera-text-primary);
  line-height: 1.2;
  transition: color var(--transition-fast);
}

.brand-badge {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--coursera-text-muted);
  letter-spacing: 0.02em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Language Selector (Coursera Linear Border Style) */
.lang-selector-wrapper {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.lang-select {
  height: 36px;
  min-height: 36px;
  padding: 0 20px 0 8px;
  background: #ffffff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 24 24' fill='none' stroke='%23495057' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E") no-repeat right 6px center;
  border: 1px solid var(--coursera-border);
  border-radius: var(--radius-none);
  font-family: var(--font-main);
  font-size: 0.80rem;
  font-weight: 600;
  color: var(--coursera-text-primary);
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  transition: all var(--transition-fast);
  outline: none;
}

.lang-select:hover {
  border-color: var(--coursera-border-dark);
  background-color: var(--coursera-bg-page);
}

.lang-select:focus {
  border-color: var(--coursera-blue);
  box-shadow: 0 0 0 2px rgba(0, 86, 210, 0.2);
}

/* Header Action Buttons (Coursera Flat Style - Uniform Square Icon Boxes) */
.header-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  min-width: 36px;
  min-height: 36px;
  max-width: 36px;
  max-height: 36px;
  padding: 0;
  box-sizing: border-box;
  background: #ffffff;
  border: 1px solid var(--coursera-border);
  border-radius: var(--radius-none);
  color: var(--coursera-text-secondary);
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.header-btn:hover {
  background: var(--coursera-bg-page);
  border-color: var(--coursera-border-dark);
  color: var(--coursera-text-primary);
}

.header-btn:active {
  background: #eaecee;
}

.header-btn svg {
  width: 18px;
  height: 18px;
  display: block;
}

.header-btn #sound-icon {
  font-size: 1.05rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.header-btn .btn-text {
  display: none;
}

.header-btn.install-btn {
  background: var(--coursera-blue-light);
  border-color: var(--coursera-blue-border);
  color: var(--coursera-blue);
}

.header-btn.install-btn:hover {
  background: #dbeaff;
  border-color: var(--coursera-blue);
}

/* ==========================================================================
   Screen Switching Logic
   ========================================================================== */

.view-screen {
  display: none;
}

.view-screen.active {
  display: block;
  animation: fadeInQuick 0.2s ease-in-out forwards;
}

@keyframes fadeInQuick {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ==========================================================================
   SCREEN 1: Welcome & Landing View (Coursera Minimal)
   ========================================================================== */

.welcome-card {
  padding: 36px 32px;
  border-top: 4px solid var(--coursera-blue);
}

.welcome-hero-badge {
  display: inline-block;
  padding: 4px 10px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--coursera-blue-light);
  border: 1px solid var(--coursera-blue-border);
  border-radius: var(--radius-none);
  color: var(--coursera-blue);
  margin-bottom: 16px;
}

.hero-title {
  font-family: var(--font-main);
  font-size: 2.1rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 12px;
  color: var(--coursera-text-primary);
}

.gradient-text {
  color: var(--coursera-blue);
}

.hero-description {
  max-width: 680px;
  margin-bottom: 28px;
  font-size: 1.05rem;
  font-weight: 400;
  color: var(--coursera-text-secondary);
}

.hero-description strong {
  color: var(--coursera-text-primary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-bottom: 30px;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px;
  background: #ffffff;
  border: 1px solid var(--coursera-border);
  border-left: 3px solid var(--coursera-blue);
  border-radius: var(--radius-none);
}

.feature-icon {
  font-size: 1.3rem;
  line-height: 1;
  flex-shrink: 0;
  margin-top: 2px;
}

.feature-text strong {
  display: block;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--coursera-text-primary);
  margin-bottom: 4px;
}

.feature-text p {
  font-size: 0.85rem;
  color: var(--coursera-text-secondary);
  line-height: 1.45;
}

/* Feature Action & PWA Card Install Button */
.feature-action-box {
  margin-top: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.pwa-card-install-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 14px;
  background: var(--coursera-blue);
  border: 1px solid var(--coursera-blue);
  border-radius: var(--radius-none);
  color: #ffffff;
  font-family: var(--font-main);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: all var(--transition-fast);
  line-height: 1.2;
}

.pwa-card-install-btn:hover {
  background: var(--coursera-blue-hover);
  border-color: var(--coursera-blue-hover);
}

.pwa-card-install-btn:active {
  background: var(--coursera-blue-active);
}

.pwa-card-install-btn.installed {
  background: var(--coursera-success);
  border-color: var(--coursera-success);
}

.pwa-card-install-btn svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

.pwa-status-badge {
  display: inline-flex;
  align-items: center;
  padding: 5px 10px;
  background: var(--coursera-success-bg);
  border: 1px solid var(--coursera-success-border);
  color: var(--coursera-success-text);
  font-size: 0.76rem;
  font-weight: 700;
  border-radius: var(--radius-none);
}

/* Welcome Screen KPI Stats Grid (Coursera Executive Tiles) */
.welcome-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}

.welcome-stat-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: #ffffff;
  border: 1px solid var(--coursera-border);
  border-radius: var(--radius-none);
  box-sizing: border-box;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.welcome-stat-card:hover {
  border-color: var(--coursera-border-dark);
}

.welcome-stat-card.dataset-card {
  border-top: 3px solid var(--coursera-blue);
}

.welcome-stat-card.sessions-card {
  border-top: 3px solid var(--coursera-success);
}

.welcome-stat-card.accuracy-card {
  border-top: 3px solid #B06000;
}

.welcome-stat-card .stat-card-icon {
  width: 40px;
  height: 40px;
  min-width: 40px;
  min-height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-none);
  flex-shrink: 0;
}

.welcome-stat-card.dataset-card .stat-card-icon {
  background: var(--coursera-blue-light);
  color: var(--coursera-blue);
}

.welcome-stat-card.sessions-card .stat-card-icon {
  background: var(--coursera-success-bg);
  color: var(--coursera-success);
}

.welcome-stat-card.accuracy-card .stat-card-icon {
  background: var(--coursera-warning-bg);
  color: var(--coursera-warning);
}

.welcome-stat-card .stat-card-icon svg {
  width: 20px;
  height: 20px;
  display: block;
}

.welcome-stat-card .stat-card-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
}

.welcome-stat-card .stat-card-val {
  font-family: var(--font-main);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--coursera-text-primary);
  line-height: 1.1;
  margin-bottom: 2px;
}

.welcome-stat-card .stat-card-lbl {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--coursera-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Clickable Stat Cards & Hint Badges */
.welcome-stat-card.clickable,
.stat-card.clickable {
  cursor: pointer;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.welcome-stat-card.clickable:hover {
  border-color: var(--coursera-blue);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 86, 210, 0.12);
}

.stat-card.clickable:hover {
  border-color: var(--coursera-blue);
  background: #ffffff;
  box-shadow: 0 2px 8px rgba(0, 86, 210, 0.1);
}

.stat-card-hint-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 3px;
  font-size: 0.70rem;
  font-weight: 700;
  color: var(--coursera-blue);
  background: var(--coursera-blue-light);
  border: 1px solid var(--coursera-blue-border);
  padding: 2px 8px;
  margin-top: 5px;
  border-radius: var(--radius-none);
  letter-spacing: 0.02em;
  white-space: nowrap;
  box-sizing: border-box;
  width: fit-content;
  max-width: 100%;
  transition: all var(--transition-fast);
}

.welcome-stat-card.clickable:hover .stat-card-hint-badge,
.stat-card.clickable:hover .stat-card-hint-badge {
  background: var(--coursera-blue);
  color: #ffffff;
  border-color: var(--coursera-blue);
}

.modal-footer-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ==========================================================================
   Session Configurator Card (Coursera Linear Form)
   ========================================================================== */

.session-config-card {
  background: #ffffff;
  border: 1px solid var(--coursera-border);
  border-left: 4px solid var(--coursera-blue);
  border-radius: var(--radius-none);
  padding: 18px 20px;
  margin-bottom: 24px;
}

.config-section-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-main);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--coursera-text-primary);
  margin-bottom: 16px;
}

.config-section-title svg {
  width: 18px;
  height: 18px;
  color: var(--coursera-blue);
}

.config-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.config-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.config-label-group {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
}

.config-label {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--coursera-text-primary);
  white-space: nowrap !important;
}

.config-note {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--coursera-blue);
  white-space: nowrap !important;
}

.config-pills {
  display: flex;
  gap: 8px;
}

.config-pill {
  flex: 1;
  min-height: 40px;
  border: 1px solid var(--coursera-border);
  background: #ffffff;
  color: var(--coursera-text-secondary);
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-none);
}

.config-pill:hover {
  border-color: var(--coursera-border-dark);
  background: var(--coursera-bg-page);
  color: var(--coursera-text-primary);
}

.config-pill.active {
  background: var(--coursera-blue);
  border-color: var(--coursera-blue);
  color: #ffffff;
}

.config-toggle-row {
  display: flex;
  gap: 8px;
}

.config-mode-pill {
  flex: 1;
  min-height: 40px;
  padding: 6px 12px;
  border: 1px solid var(--coursera-border);
  background: #ffffff;
  color: var(--coursera-text-secondary);
  font-family: var(--font-main);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: var(--radius-none);
}

.config-mode-pill:hover {
  border-color: var(--coursera-border-dark);
  background: var(--coursera-bg-page);
  color: var(--coursera-text-primary);
}

.config-mode-pill.active {
  background: var(--coursera-blue);
  border-color: var(--coursera-blue);
  color: #ffffff;
}

/* Configuration Dedicated Page */
.config-view-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.config-back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: none;
  color: var(--coursera-text-secondary);
  font-family: var(--font-main);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  padding: 6px 0;
  transition: color var(--transition-fast);
}

.config-back-link:hover {
  color: var(--coursera-blue);
}

.config-back-link svg {
  width: 16px;
  height: 16px;
}

.config-actions-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 24px;
}

.config-actions-row .cta-button {
  min-width: 180px;
}

/* ==========================================================================
   Buttons & CTA (Coursera Flat Style)
   ========================================================================== */

.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-family: var(--font-main);
  font-size: 0.98rem;
  font-weight: 600;
  border-radius: var(--radius-none);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  text-decoration: none;
  border: 1px solid transparent;
}

.cta-button svg {
  width: 18px;
  height: 18px;
}

/* Primary Coursera Blue Button */
.cta-button.primary {
  background: var(--coursera-blue);
  color: #ffffff;
}

.cta-button.primary:hover {
  background: var(--coursera-blue-hover);
}

.cta-button.primary:active {
  background: var(--coursera-blue-active);
}

/* Secondary Button */
.cta-button.secondary {
  background: #ffffff;
  border: 1px solid var(--coursera-blue);
  color: var(--coursera-blue);
}

.cta-button.secondary:hover {
  background: var(--coursera-blue-light);
}

.cta-button.mini-btn {
  padding: 8px 16px;
  font-size: 0.88rem;
}

/* ==========================================================================
   SCREEN 2: Active Quiz Screen (Coursera Style Assessment)
   ========================================================================== */

/* Progress Top Card */
.session-progress-card {
  padding: 14px 18px;
  margin-bottom: 16px;
  border-top: 3px solid var(--coursera-blue);
}

/* Top Row: Domanda n/totali a sinistra, Giuste/Sbagliate a destra */
.progress-top-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  margin-bottom: 12px;
}

.progress-step-info {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  white-space: nowrap;
}

.step-label {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--coursera-text-muted);
}

.step-counter {
  font-family: var(--font-main);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--coursera-text-primary);
  white-space: nowrap;
}

.step-counter strong {
  color: var(--coursera-blue);
  font-size: 1.15rem;
}

/* In-Quiz Countdown Timer (Coursera Exam Pace) */
.quiz-timer-container {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--coursera-blue-light);
  border: 1px solid var(--coursera-blue-border);
  color: var(--coursera-blue);
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 0.92rem;
  border-radius: var(--radius-none);
  transition: all var(--transition-fast);
}

.quiz-timer-container svg {
  width: 15px;
  height: 15px;
  display: block;
}

.quiz-timer-container.warning {
  background: var(--coursera-warning-bg);
  border-color: var(--coursera-warning-border);
  color: var(--coursera-warning);
}

.quiz-timer-container.danger {
  background: var(--coursera-error-bg);
  border-color: var(--coursera-error-border);
  color: var(--coursera-error);
  animation: pulseTimer 1s infinite alternate;
}

@keyframes pulseTimer {
  0% { transform: scale(1); }
  100% { transform: scale(1.05); }
}

/* Live score pills in alto a destra */
.session-live-score {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}

.score-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: var(--radius-none);
  font-size: 0.85rem;
  font-weight: 700;
  line-height: 1;
}

.score-badge.correct-badge {
  background: var(--coursera-success-bg);
  color: var(--coursera-success-text);
  border: 1px solid var(--coursera-success-border);
}

.score-badge.incorrect-badge {
  background: var(--coursera-error-bg);
  color: var(--coursera-error-text);
  border: 1px solid var(--coursera-error-border);
}

/* Second Row: Caselle con le domande in progressione al centro */
.progress-stepper-center-row {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  margin-bottom: 12px;
}

/* 5-Step Stepper Linear Indicators */
.stepper-dots {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  max-width: 100%;
}

.step-dot {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.88rem;
  font-weight: 700;
  background: #ffffff;
  border: 1px solid var(--coursera-border);
  border-radius: var(--radius-none);
  color: var(--coursera-text-muted);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.step-dot.active {
  background: var(--coursera-blue);
  border-color: var(--coursera-blue);
  color: #fff;
}

.step-dot.correct {
  background: var(--coursera-success);
  border-color: var(--coursera-success);
  color: #fff;
}

.step-dot.incorrect {
  background: var(--coursera-error);
  border-color: var(--coursera-error);
  color: #fff;
}

/* Thin Linear Progress Bar (Coursera 3px Line) */
.progress-track {
  width: 100%;
  height: 4px;
  background: #e2e8f0;
  border-radius: var(--radius-none);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--coursera-blue);
  transition: width 0.25s ease;
}

/* Question Content Container */
.question-container {
  padding: 28px 26px;
  margin-bottom: 24px;
}

.question-meta-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}

.meta-tag {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 3px 8px;
  border-radius: var(--radius-none);
  background: var(--coursera-bg-subtle);
  border: 1px solid var(--coursera-border);
  color: var(--coursera-text-muted);
}

.meta-tag.category-tag {
  background: var(--coursera-blue-light);
  color: var(--coursera-blue);
  border: 1px solid var(--coursera-blue-border);
}

.question-title {
  font-family: var(--font-main);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--coursera-text-primary);
  margin-bottom: 20px;
}

/* ==========================================================================
   Hint Accordion - Academic Link / Subtle Box
   ========================================================================== */

.hint-section {
  margin-bottom: 22px;
}

.hint-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: transparent;
  border: 1px solid var(--coursera-border);
  border-radius: var(--radius-none);
  color: var(--coursera-blue);
  font-family: var(--font-main);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.hint-btn:hover {
  background: var(--coursera-blue-light);
  border-color: var(--coursera-blue-border);
}

.hint-chevron {
  font-size: 0.65rem;
  transition: transform var(--transition-fast);
}

.hint-btn[aria-expanded="true"] .hint-chevron {
  transform: rotate(180deg);
}

.hint-content-box {
  margin-top: 10px;
  padding: 14px 16px;
  background: var(--coursera-warning-bg);
  border: 1px solid var(--coursera-warning-border);
  border-left: 3px solid var(--coursera-warning);
  border-radius: var(--radius-none);
}

.hint-tag {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--coursera-warning);
  margin-bottom: 4px;
}

.hint-text-p {
  font-size: 0.92rem;
  color: var(--coursera-warning-text);
  line-height: 1.5;
}

/* ==========================================================================
   Options Grid & Full-Width Option Cards (Maximized Mobile Space)
   ========================================================================== */

.options-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

/* Linear Flat Option Card */
.option-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  padding: 14px 16px;
  background: #ffffff;
  border: 1px solid var(--coursera-border);
  border-left: 4px solid transparent;
  border-radius: var(--radius-none);
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
  user-select: none;
  text-align: left;
}

.option-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  margin-bottom: 8px;
}

.option-card:hover:not(.locked) {
  background: var(--coursera-bg-subtle);
  border-color: var(--coursera-border-dark);
}

.option-card:active:not(.locked) {
  background: var(--coursera-blue-light);
}

/* Option Letter Badge on Top-Left */
.option-letter-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  flex-shrink: 0;
  border-radius: var(--radius-none);
  background: var(--coursera-bg-subtle);
  border: 1px solid var(--coursera-border);
  font-family: var(--font-main);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--coursera-text-secondary);
}

.option-card:hover:not(.locked) .option-letter-badge {
  background: var(--coursera-blue-light);
  border-color: var(--coursera-blue);
  color: var(--coursera-blue);
}

/* Status Icon on Top-Right */
.option-status-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1;
  opacity: 0;
}

/* Full Width Text Wrapper - Placed UNDER the letter, spans 100% horizontal width */
.option-text-wrapper {
  width: 100%;
  font-size: 1rem;
  font-weight: 500;
  color: var(--coursera-text-primary);
  line-height: 1.55;
  word-break: break-word;
}

/* ==========================================================================
   Option States on Selection (Coursera Professional Indicators)
   ========================================================================== */

.option-card.locked {
  cursor: default;
}

/* Selected Correct Card */
.option-card.is-correct {
  background: var(--coursera-success-bg) !important;
  border-color: var(--coursera-success-border) !important;
  border-left: 4px solid var(--coursera-success) !important;
}

.option-card.is-correct .option-letter-badge {
  background: var(--coursera-success) !important;
  color: #fff !important;
  border-color: var(--coursera-success) !important;
}

.option-card.is-correct .option-status-icon {
  opacity: 1;
  color: var(--coursera-success);
}

/* Selected Incorrect Card */
.option-card.is-incorrect {
  background: var(--coursera-error-bg) !important;
  border-color: var(--coursera-error-border) !important;
  border-left: 4px solid var(--coursera-error) !important;
}

.option-card.is-incorrect .option-letter-badge {
  background: var(--coursera-error) !important;
  color: #fff !important;
  border-color: var(--coursera-error) !important;
}

.option-card.is-incorrect .option-status-icon {
  opacity: 1;
  color: var(--coursera-error);
}

/* Correct Answer Revealed when User Picked Wrong */
.option-card.reveal-correct {
  background: var(--coursera-success-bg) !important;
  border: 1px dashed var(--coursera-success) !important;
  border-left: 4px solid var(--coursera-success) !important;
}

.option-card.reveal-correct .option-letter-badge {
  background: #ffffff !important;
  color: var(--coursera-success) !important;
  border-color: var(--coursera-success) !important;
}

.option-card.reveal-correct .option-status-icon {
  opacity: 1;
  color: var(--coursera-success);
}

.option-card.dimmed {
  opacity: 0.55;
  background: #fdfdfd;
}

/* ==========================================================================
   Inline Explanation directly inside the Option Card (Coursera Academic Callout)
   ========================================================================== */

.option-inline-explanation {
  margin-top: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-none);
  background: #ffffff;
  border: 1px solid var(--coursera-border);
}

.option-inline-explanation.is-correct-exp {
  border-left: 4px solid var(--coursera-success);
  background: #ffffff;
}

.option-inline-explanation.is-incorrect-exp {
  border-left: 4px solid var(--coursera-error);
  background: #ffffff;
}

.inline-exp-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}

.option-inline-explanation.is-correct-exp .inline-exp-badge {
  color: var(--coursera-success-text);
}

.option-inline-explanation.is-incorrect-exp .inline-exp-badge {
  color: var(--coursera-error-text);
}

.inline-exp-text {
  font-size: 0.94rem;
  font-weight: 400;
  line-height: 1.55;
  color: var(--coursera-text-primary);
}

/* ==========================================================================
   Feedback Footer Container (Coursera Action Area)
   ========================================================================== */

.feedback-container {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--coursera-border);
}

/* Status Banner */
.feedback-status-banner {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: var(--radius-none);
  margin-bottom: 16px;
  font-family: var(--font-main);
  font-size: 1rem;
  font-weight: 700;
}

.feedback-status-banner.correct {
  background: var(--coursera-success-bg);
  border: 1px solid var(--coursera-success-border);
  border-left: 4px solid var(--coursera-success);
  color: var(--coursera-success-text);
}

.feedback-status-banner.incorrect {
  background: var(--coursera-error-bg);
  border: 1px solid var(--coursera-error-border);
  border-left: 4px solid var(--coursera-error);
  color: var(--coursera-error-text);
}

/* Feedback Actions */
.feedback-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.shortcut-tip {
  font-size: 0.82rem;
  color: var(--coursera-text-muted);
}

/* Nascondi scorciatoia da tastiera su dispositivi touch, smartphone e tablet */
@media (hover: none) and (pointer: coarse), (max-width: 768px) {
  .shortcut-tip {
    display: none !important;
  }
}

kbd {
  padding: 2px 6px;
  background: var(--coursera-bg-subtle);
  border: 1px solid var(--coursera-border);
  border-radius: var(--radius-none);
  font-family: monospace;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--coursera-text-primary);
}

/* ==========================================================================
   SCREEN 3: Summary & Score Screen (Coursera Academic Assessment Report)
   ========================================================================== */

.summary-card {
  padding: 36px 30px;
  border-top: 4px solid var(--coursera-blue);
}

.summary-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-bottom: 32px;
}

/* SVG Circular Score Ring */
.score-ring-wrapper {
  position: relative;
  width: 130px;
  height: 130px;
  margin-bottom: 18px;
}

.score-ring-svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.score-ring-bg {
  fill: none;
  stroke: #e2e8f0;
  stroke-width: 10;
}

.score-ring-fill {
  fill: none;
  stroke: var(--coursera-blue);
  stroke-width: 10;
  stroke-linecap: square;
  stroke-dasharray: 440;
  stroke-dashoffset: 440;
  transition: stroke-dashoffset 0.8s cubic-bezier(0.4, 0, 0.2, 1), stroke 0.3s ease;
}

.score-ring-content {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.score-number {
  font-family: var(--font-main);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--coursera-text-primary);
  line-height: 1;
}

.score-percent {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--coursera-blue);
  margin-top: 4px;
}

.summary-verdict-title {
  font-family: var(--font-main);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--coursera-text-primary);
  margin-bottom: 6px;
}

.summary-verdict-desc {
  font-size: 1rem;
  color: var(--coursera-text-secondary);
  max-width: 580px;
}

.summary-time-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--coursera-bg-subtle);
  border: 1px solid var(--coursera-border);
  color: var(--coursera-text-secondary);
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: var(--radius-none);
  margin-top: 10px;
}

.summary-time-pill svg {
  width: 15px;
  height: 15px;
  color: var(--coursera-blue);
}

/* Summary Metrics Grid (Coursera Flat Tiles - Uniform & Aligned) */
.summary-metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}

.metric-box {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: #ffffff;
  border: 1px solid var(--coursera-border);
  border-radius: var(--radius-none);
  text-align: left;
  min-height: 74px;
  box-sizing: border-box;
}

.metric-box .metric-icon {
  width: 38px;
  height: 38px;
  min-width: 38px;
  min-height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border-radius: var(--radius-none);
}

.metric-box .metric-icon svg {
  width: 20px;
  height: 20px;
  display: block;
}

.metric-box.correct .metric-icon {
  background: var(--coursera-success-bg);
  color: var(--coursera-success);
}

.metric-box.incorrect .metric-icon {
  background: var(--coursera-error-bg);
  color: var(--coursera-error);
}

.metric-box.hints .metric-icon {
  background: var(--coursera-warning-bg);
  color: var(--coursera-warning);
}

.metric-box.accuracy .metric-icon {
  background: var(--coursera-blue-light);
  color: var(--coursera-blue);
}

.metric-data {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
  flex: 1;
}

.metric-val {
  font-family: var(--font-main);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--coursera-text-primary);
  line-height: 1.1;
  margin-bottom: 3px;
}

.metric-lbl {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--coursera-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  line-height: 1.25;
  min-height: 2.5em;
  display: flex;
  align-items: flex-start;
}

/* Actions Row - Uniform Button Sizing */
.summary-actions-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.summary-actions-row .cta-button {
  flex: 1;
  max-width: 260px;
  min-width: 220px;
  min-height: 48px;
  padding: 12px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-sizing: border-box;
}

/* Detailed Question Review */
.summary-review-section {
  border-top: 1px solid var(--coursera-border);
  padding-top: 26px;
  text-align: left;
}

.review-heading {
  display: flex;
  flex-direction: column;
  margin-bottom: 16px;
}

.review-heading span:first-child {
  font-family: var(--font-main);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--coursera-text-primary);
}

.review-sub {
  font-size: 0.85rem;
  color: var(--coursera-text-muted);
}

.review-items-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.review-item {
  border: 1px solid var(--coursera-border);
  border-radius: var(--radius-none);
  background: #ffffff;
  overflow: hidden;
}

.review-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  cursor: pointer;
  user-select: none;
  background: #ffffff;
}

.review-item-header:hover {
  background: var(--coursera-bg-subtle);
}

.review-item-left {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  flex: 1;
  min-width: 0;
  padding-right: 12px;
}

.review-item-badges-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.review-question-snippet {
  font-size: 0.90rem;
  font-weight: 700;
  color: var(--coursera-text-primary);
  line-height: 1.45;
  width: 100%;
}

.review-status-pill {
  padding: 2px 8px;
  border-radius: var(--radius-none);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  flex-shrink: 0;
}

.review-status-pill.correct {
  background: var(--coursera-success-bg);
  color: var(--coursera-success);
  border: 1px solid var(--coursera-success-border);
}

.review-status-pill.incorrect {
  background: var(--coursera-error-bg);
  color: var(--coursera-error);
  border: 1px solid var(--coursera-error-border);
}

.review-question-snippet {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--coursera-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.review-toggle-icon {
  font-size: 0.75rem;
  color: var(--coursera-text-muted);
  transition: transform var(--transition-fast);
}

.review-item.open .review-toggle-icon {
  transform: rotate(180deg);
}

.review-item-body {
  display: none;
  padding: 16px;
  border-top: 1px solid var(--coursera-border);
  background: var(--coursera-bg-subtle);
}

.review-item.open .review-item-body {
  display: block;
}

.review-full-q {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--coursera-text-primary);
  margin-bottom: 12px;
  line-height: 1.5;
}

.review-answers-compare {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.review-exp-box {
  padding: 12px 14px;
  border-radius: var(--radius-none);
  font-size: 0.9rem;
  background: #ffffff;
  border: 1px solid var(--coursera-border);
  color: var(--coursera-text-primary);
  line-height: 1.5;
}

/* ==========================================================================
   Modal Dialog Styles (Coursera Minimal)
   ========================================================================== */

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 16px;
}

.modal-card {
  width: 100%;
  max-width: 500px;
  padding: 24px;
  background: #ffffff;
  border: 1px solid var(--coursera-border);
  border-top: 4px solid var(--coursera-blue);
  border-radius: var(--radius-none);
  box-shadow: var(--shadow-popup);
}

.modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--coursera-border);
  gap: 12px;
}

.modal-header-left {
  flex: 1;
  min-width: 0;
}

.modal-title {
  font-family: var(--font-main);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--coursera-text-primary);
  line-height: 1.25;
}

.close-modal-btn {
  background: none;
  border: none;
  color: var(--coursera-text-muted);
  font-size: 1.55rem;
  cursor: pointer;
  line-height: 1;
  padding: 0 4px;
  margin-top: -3px;
  margin-right: -4px;
  flex-shrink: 0;
  align-self: flex-start;
  transition: color var(--transition-fast);
}

.close-modal-btn:hover {
  color: var(--coursera-text-primary);
}

.stats-overview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 18px;
}

.stat-card {
  padding: 14px;
  background: var(--coursera-bg-subtle);
  border: 1px solid var(--coursera-border);
  border-radius: var(--radius-none);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.stat-num {
  font-family: var(--font-main);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--coursera-blue);
  line-height: 1.1;
  margin-bottom: 4px;
}

.stat-name {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--coursera-text-muted);
}

.stats-pmp-advice {
  padding: 12px 14px;
  background: var(--coursera-blue-light);
  border: 1px solid var(--coursera-blue-border);
  border-radius: var(--radius-none);
  margin-bottom: 18px;
}

.stats-pmp-advice h4 {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--coursera-blue);
  margin-bottom: 4px;
}

.stats-pmp-advice p {
  font-size: 0.82rem;
  color: var(--coursera-text-secondary);
  line-height: 1.45;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--coursera-border);
  padding-top: 14px;
}

.danger-text-btn {
  background: none;
  border: none;
  color: var(--coursera-error);
  font-family: var(--font-main);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
  padding: 2px;
}

.danger-text-btn:hover {
  color: #9f1310;
}

#stats-modal .modal-card {
  max-width: 580px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
}

#stats-modal .modal-body {
  overflow-y: auto;
  max-height: calc(88vh - 140px);
  padding-right: 6px;
}

/* ==========================================================================
   Statistics by Ambito / Knowledge Domain
   ========================================================================== */

.stats-ambiti-section {
  margin-top: 18px;
  margin-bottom: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--coursera-border);
}

.stats-section-header {
  margin-bottom: 12px;
}

.stats-section-subtitle {
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--coursera-text-primary);
  margin-bottom: 4px;
}

.stats-section-desc {
  font-size: 0.80rem;
  color: var(--coursera-text-muted);
  line-height: 1.4;
}

.stats-ambiti-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.stats-ambito-card {
  padding: 12px 14px;
  background: var(--coursera-bg-subtle);
  border: 1px solid var(--coursera-border);
  border-radius: var(--radius-none);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}

.stats-ambito-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.stats-ambito-name {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--coursera-text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.stats-ambito-mastery-badge {
  padding: 3px 8px;
  font-size: 0.72rem;
  font-weight: 700;
  border-radius: var(--radius-none);
  white-space: nowrap;
}

.stats-ambito-mastery-badge.mastery-advanced {
  background: var(--coursera-success-bg);
  color: var(--coursera-success-text);
  border: 1px solid var(--coursera-success-border);
}

.stats-ambito-mastery-badge.mastery-proficient {
  background: var(--coursera-blue-light);
  color: var(--coursera-blue);
  border: 1px solid var(--coursera-blue-border);
}

.stats-ambito-mastery-badge.mastery-developing {
  background: #fff8e6;
  color: #b45309;
  border: 1px solid #fcd34d;
}

.stats-ambito-mastery-badge.mastery-critical {
  background: var(--coursera-error-bg);
  color: var(--coursera-error-text);
  border: 1px solid var(--coursera-error-border);
}

.stats-ambito-bar-container {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 6px;
}

.stats-ambito-track {
  flex: 1;
  height: 8px;
  background: #e2e8f0;
  border-radius: var(--radius-none);
  overflow: hidden;
}

.stats-ambito-fill {
  height: 100%;
  border-radius: var(--radius-none);
  transition: width 0.4s ease;
}

.stats-ambito-fill.mastery-advanced {
  background: var(--coursera-success);
}

.stats-ambito-fill.mastery-proficient {
  background: var(--coursera-blue);
}

.stats-ambito-fill.mastery-developing {
  background: #d97706;
}

.stats-ambito-fill.mastery-critical {
  background: var(--coursera-error);
}

.stats-ambito-pct {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--coursera-text-primary);
  min-width: 42px;
  text-align: right;
  font-feature-settings: "tnum";
}

.stats-ambito-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.76rem;
  color: var(--coursera-text-muted);
}

.stats-ambiti-empty {
  text-align: center;
  padding: 16px;
  font-size: 0.84rem;
  color: var(--coursera-text-muted);
  background: #ffffff;
  border: 1px dashed var(--coursera-border);
}

.q-ambito-tag {
  display: inline-block;
  padding: 2px 7px;
  font-size: 0.70rem;
  font-weight: 700;
  background: var(--coursera-blue-light);
  color: var(--coursera-blue);
  border: 1px solid var(--coursera-blue-border);
  border-radius: var(--radius-none);
  margin-right: 6px;
  vertical-align: middle;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

/* ==========================================================================
   PWA Installation Guide Modal
   ========================================================================== */

.pwa-modal-card {
  max-width: 520px;
}

.pwa-modal-subtitle {
  font-size: 0.88rem;
  color: var(--coursera-text-secondary);
  line-height: 1.45;
  margin-bottom: 16px;
}

.pwa-tabs-nav {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--coursera-border);
  margin-bottom: 16px;
}

.pwa-tab-btn {
  flex: 1;
  padding: 10px 6px;
  background: var(--coursera-bg-subtle);
  border: 1px solid var(--coursera-border);
  border-bottom: none;
  border-radius: var(--radius-none);
  font-family: var(--font-main);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--coursera-text-secondary);
  cursor: pointer;
  text-align: center;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.pwa-tab-btn:hover {
  color: var(--coursera-text-primary);
  background: #ffffff;
}

.pwa-tab-btn.active {
  background: #ffffff;
  color: var(--coursera-blue);
  font-weight: 700;
  border-top: 3px solid var(--coursera-blue);
  margin-bottom: -2px;
  border-bottom: 2px solid #ffffff;
}

.pwa-tab-pane {
  display: none;
}

.pwa-tab-pane.active {
  display: block;
  animation: fadeInQuick 0.15s ease-in-out forwards;
}

.pwa-steps-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.pwa-steps-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 12px;
  background: var(--coursera-bg-subtle);
  border: 1px solid var(--coursera-border);
  border-left: 3px solid var(--coursera-blue);
  border-radius: var(--radius-none);
}

.pwa-step-num {
  width: 22px;
  height: 22px;
  min-width: 22px;
  background: var(--coursera-blue);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-none);
  margin-top: 1px;
}

.pwa-step-text {
  font-size: 0.85rem;
  color: var(--coursera-text-primary);
  line-height: 1.45;
}

.pwa-step-text strong {
  color: var(--coursera-text-primary);
}

.pwa-modal-footer {
  margin-top: 20px;
  display: flex;
  justify-content: flex-end;
}

/* ==========================================================================
   Session History & Error Analysis Modal
   ========================================================================== */

.history-modal-card {
  max-width: 760px;
  width: 95%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
}

.history-modal-sub {
  font-size: 0.82rem;
  color: var(--coursera-text-secondary);
  margin-top: 3px;
  line-height: 1.35;
}

.history-modal-body {
  overflow-y: auto;
  max-height: calc(88vh - 160px);
  padding-right: 6px;
  margin-top: 4px;
}

.history-controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--coursera-border);
}

.history-filter-pills {
  display: flex;
  gap: 6px;
}

.history-filter-pill {
  padding: 6px 12px;
  background: var(--coursera-bg-subtle);
  border: 1px solid var(--coursera-border);
  border-radius: var(--radius-none);
  font-family: var(--font-main);
  font-size: 0.80rem;
  font-weight: 600;
  color: var(--coursera-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.history-filter-pill:hover {
  color: var(--coursera-text-primary);
  background: #ffffff;
}

.history-filter-pill.active {
  background: var(--coursera-blue);
  color: #ffffff;
  border-color: var(--coursera-blue);
  font-weight: 700;
}

.history-meta-summary {
  font-size: 0.80rem;
  font-weight: 600;
  color: var(--coursera-text-muted);
}

.history-sessions-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.history-session-card {
  background: #ffffff;
  border: 1px solid var(--coursera-border);
  border-left: 4px solid var(--coursera-blue);
  border-radius: var(--radius-none);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  transition: border-color var(--transition-fast);
}

.history-session-card.status-pass {
  border-left-color: var(--coursera-success);
}

.history-session-card.status-review {
  border-left-color: var(--coursera-blue);
}

.history-session-card.status-fail {
  border-left-color: var(--coursera-error);
}

.history-session-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  cursor: pointer;
  user-select: none;
  background: #ffffff;
  transition: background var(--transition-fast);
  gap: 10px;
}

.history-session-header:hover {
  background: var(--coursera-bg-subtle);
}

.history-session-title-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.history-session-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--coursera-text-primary);
}

.history-session-meta {
  font-size: 0.76rem;
  color: var(--coursera-text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.history-session-stats-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.history-score-pill {
  padding: 3px 8px;
  font-size: 0.78rem;
  font-weight: 700;
  border-radius: var(--radius-none);
}

.history-score-pill.pass {
  background: var(--coursera-success-bg);
  color: var(--coursera-success-text);
  border: 1px solid var(--coursera-success-border);
}

.history-score-pill.review {
  background: var(--coursera-blue-light);
  color: var(--coursera-blue);
  border: 1px solid var(--coursera-blue-border);
}

.history-score-pill.fail {
  background: var(--coursera-error-bg);
  color: var(--coursera-error-text);
  border: 1px solid var(--coursera-error-border);
}

.history-errors-pill {
  padding: 3px 8px;
  font-size: 0.78rem;
  font-weight: 700;
  border-radius: var(--radius-none);
}

.history-errors-pill.has-errors {
  background: var(--coursera-error-bg);
  color: var(--coursera-error-text);
  border: 1px solid var(--coursera-error-border);
}

.history-errors-pill.no-errors {
  background: var(--coursera-success-bg);
  color: var(--coursera-success-text);
  border: 1px solid var(--coursera-success-border);
}

.history-expand-icon {
  font-size: 0.75rem;
  color: var(--coursera-text-muted);
  transition: transform var(--transition-fast);
  display: inline-block;
  margin-left: 4px;
}

.history-session-card.open .history-expand-icon {
  transform: rotate(180deg);
}

.history-session-body {
  display: none;
  padding: 14px 16px;
  border-top: 1px solid var(--coursera-border);
  background: var(--coursera-bg-subtle);
}

.history-session-card.open .history-session-body {
  display: block;
}

.history-session-actions-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--coursera-border);
  flex-wrap: wrap;
  gap: 8px;
}

.history-session-actions-top strong {
  font-size: 0.82rem;
  color: var(--coursera-text-secondary);
}

.history-retry-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  background: var(--coursera-error-bg);
  color: var(--coursera-error-text);
  border: 1px solid var(--coursera-error-border);
  font-family: var(--font-main);
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  border-radius: var(--radius-none);
  transition: all var(--transition-fast);
}

.history-retry-btn:hover {
  background: #fbd6d6;
  border-color: var(--coursera-error);
}

.history-questions-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.history-q-item {
  padding: 12px 14px;
  background: #ffffff;
  border: 1px solid var(--coursera-border);
  border-radius: var(--radius-none);
}

.history-q-item.incorrect {
  border-left: 4px solid var(--coursera-error);
  background: #fffdfd;
}

.history-q-item.correct {
  border-left: 4px solid var(--coursera-success);
}

.history-q-header {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 8px;
}

.history-q-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
}

.history-q-meta-tags {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.history-q-title {
  font-size: 0.90rem;
  font-weight: 700;
  color: var(--coursera-text-primary);
  line-height: 1.45;
  width: 100%;
}

.history-q-pill {
  padding: 2px 7px;
  font-size: 0.70rem;
  font-weight: 700;
  border-radius: var(--radius-none);
  flex-shrink: 0;
}

.history-q-pill.incorrect {
  background: var(--coursera-error-bg);
  color: var(--coursera-error-text);
  border: 1px solid var(--coursera-error-border);
}

.history-q-pill.correct {
  background: var(--coursera-success-bg);
  color: var(--coursera-success-text);
  border: 1px solid var(--coursera-success-border);
}

.history-q-answers {
  margin-top: 8px;
  font-size: 0.84rem;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.history-q-rationale {
  margin-top: 8px;
  padding: 8px 10px;
  background: var(--coursera-bg-subtle);
  border: 1px solid var(--coursera-border);
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--coursera-text-primary);
}

.history-empty-state {
  text-align: center;
  padding: 36px 16px;
}

.history-empty-state .empty-state-icon {
  font-size: 2.2rem;
  margin-bottom: 8px;
}

.history-empty-state .empty-state-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--coursera-text-primary);
  margin-bottom: 6px;
}

.history-empty-state .empty-state-desc {
  font-size: 0.86rem;
  color: var(--coursera-text-muted);
  max-width: 420px;
  margin: 0 auto;
}

.history-modal-footer {
  margin-top: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--coursera-border);
  padding-top: 12px;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.app-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  margin-top: auto;
  padding: 20px 0 0;
  font-size: 0.8rem;
  color: var(--coursera-text-muted);
  border-top: 1px solid var(--coursera-border);
}

.footer-status {
  display: flex;
  align-items: center;
  gap: 6px;
}

.status-indicator {
  width: 8px;
  height: 8px;
  background: var(--coursera-success);
  border-radius: var(--radius-none);
}

/* Helper Utilities */
.hidden {
  display: none !important;
}

/* ==========================================================================
   Responsive Adaptations & Mobile Optimization (Max Space for Answers)
   ========================================================================== */

@media (max-width: 640px) {
  .app-wrapper {
    padding: 0 10px 24px;
  }

  .app-header {
    padding: 10px 14px;
    margin: 10px 0 14px;
  }

  .brand-title {
    font-size: 1.05rem;
  }

  .brand-badge {
    display: none;
  }

  .session-config-card {
    padding: 14px 12px;
  }

  .config-section-title {
    font-size: 0.98rem;
    white-space: nowrap !important;
  }

  .config-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .config-label-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 6px;
    width: 100%;
  }

  .config-label {
    font-size: 0.84rem;
    white-space: nowrap !important;
    flex-shrink: 0;
  }

  .config-note {
    font-size: 0.76rem;
    white-space: nowrap !important;
    text-align: right;
  }

  .config-pill {
    white-space: nowrap !important;
  }

  .config-mode-pill {
    padding: 6px 8px;
    font-size: 0.78rem;
    white-space: nowrap !important;
  }

  .config-actions-row {
    flex-direction: column;
    width: 100%;
    gap: 10px;
  }

  .config-actions-row .cta-button {
    width: 100%;
    min-width: 0;
  }

  .welcome-card {
    padding: 22px 16px;
  }

  .welcome-stats-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-bottom: 24px;
  }

  .welcome-stat-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 12px 6px;
    gap: 8px;
  }

  .welcome-stat-card .stat-card-icon {
    width: 32px;
    height: 32px;
    min-width: 32px;
    min-height: 32px;
  }

  .welcome-stat-card .stat-card-icon svg {
    width: 16px;
    height: 16px;
  }

  .welcome-stat-card .stat-card-val {
    font-size: 1.25rem;
  }

  .welcome-stat-card .stat-card-lbl {
    font-size: 0.65rem;
    white-space: normal;
    line-height: 1.2;
    letter-spacing: 0.02em;
  }

  .stat-card-hint-badge {
    font-size: 0.62rem;
    padding: 2px 6px;
    margin-top: 4px;
    white-space: nowrap;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.25;
  }

  .modal-header {
    gap: 8px;
    margin-bottom: 14px;
    padding-bottom: 8px;
  }

  .close-modal-btn {
    font-size: 1.6rem;
    padding: 0 4px;
    margin-top: -4px;
    margin-right: -4px;
  }

  .hero-title {
    font-size: 1.65rem;
  }

  .question-container {
    padding: 16px 14px;
  }

  .question-title {
    font-size: 1.1rem;
    line-height: 1.45;
  }

  /* CRITICAL MOBILE OPTIMIZATION:
     Letter and status icon on top-bar, text under it spanning 100% full width */
  .option-card {
    padding: 12px 14px;
  }

  .option-header-bar {
    margin-bottom: 6px;
  }

  .option-letter-badge {
    width: 24px;
    height: 24px;
    font-size: 0.82rem;
  }

  .option-text-wrapper {
    width: 100%;
    font-size: 0.95rem;
    line-height: 1.5;
  }

  /* Azioni avanzamento domanda su mobile: pulsante a tutta larghezza e scorciatoie nascoste */
  .feedback-actions {
    justify-content: center;
  }

  .feedback-actions .next-btn {
    width: 100%;
    justify-content: center;
  }

  .summary-metrics-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 24px;
  }

  .summary-actions-row {
    flex-direction: column;
    width: 100%;
    max-width: 320px;
    margin-left: auto;
    margin-right: auto;
    gap: 10px;
    margin-bottom: 28px;
  }

  .summary-actions-row .cta-button {
    width: 100%;
    max-width: 100%;
    min-width: 0;
  }

  /* Mobile Progress Header: 2 distinct rows */
  .session-progress-card {
    padding: 12px 14px;
    margin-bottom: 12px;
  }

  .progress-top-info {
    margin-bottom: 10px;
  }

  .step-label {
    font-size: 0.76rem;
  }

  .step-counter {
    font-size: 0.98rem;
  }

  .score-badge {
    padding: 3px 8px;
    font-size: 0.82rem;
  }

  .progress-stepper-center-row {
    margin-bottom: 10px;
  }

  .stepper-dots {
    gap: 6px;
    max-width: 100%;
  }

  .step-dot {
    width: 26px;
    height: 26px;
    font-size: 0.78rem;
  }

  .header-actions {
    gap: 6px;
  }

  .app-footer {
    flex-direction: column;
    gap: 6px;
    text-align: center;
  }
}

/* Ultra-compact Mobile Screens (<= 380px) */
@media (max-width: 380px) {
  .lang-select {
    padding: 0 16px 0 4px;
    font-size: 0.74rem;
  }

  .config-label {
    font-size: 0.78rem !important;
  }

  .config-note {
    font-size: 0.70rem !important;
  }

  .config-mode-pill {
    font-size: 0.74rem !important;
    padding: 6px 4px !important;
  }

  .stat-card-hint-badge {
    font-size: 0.54rem !important;
    padding: 2px 4px !important;
    margin-top: 3px !important;
  }
}