:root {
      --pmi-purple-dark: #23094d;
      --pmi-purple: #4f17a8;
      --pmi-purple-light: #6b2fd6;
      --pmi-purple-tint: #f3effb;
      --pmi-accent: #00798c;
      --pmi-orange: #e05a00;
      --bg-main: #f4f6f9;
      --bg-card: #ffffff;
      --text-primary: #1a202c;
      --text-secondary: #4a5568;
      --text-muted: #718096;
      --border-color: #d8dee9;
      --success: #15803d;
      --success-bg: #dcfce7;
      --success-border: #86efac;
      --danger: #b91c1c;
      --danger-bg: #fee2e2;
      --danger-border: #fca5a5;
      --warning: #b45309;
      --warning-bg: #fef3c7;
      --warning-border: #fcd34d;
      --flag-color: #d97706;
      --flag-bg: #fffbeb;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
      --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.1);
      --shadow-lg: 0 12px 28px rgba(15, 23, 42, 0.16);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 14px;
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-main);
      color: var(--text-primary);
      line-height: 1.55;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

    /* TOP EXAM HEADER BAR (Pearson VUE / PMI Style) */
    .exam-header {
      background: linear-gradient(135deg, var(--pmi-purple-dark) 0%, var(--pmi-purple) 100%);
      color: #ffffff;
      padding: 0.65rem 1.25rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1rem;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.22);
      position: sticky;
      top: 0;
      z-index: 100;
      flex-wrap: wrap;
    }

    .brand-block {
      display: flex;
      align-items: center;
      gap: 0.75rem;
    }

    .pmi-logo-badge {
      background: #ffffff;
      color: var(--pmi-purple-dark);
      font-weight: 900;
      font-size: 0.95rem;
      letter-spacing: 0.04em;
      padding: 0.35rem 0.65rem;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      gap: 0.3rem;
      box-shadow: 0 2px 4px rgba(0,0,0,0.15);
      user-select: none;
    }

    .pmi-logo-badge span.tri {
      color: var(--pmi-orange);
      font-size: 1.05rem;
    }

    .exam-title-group h1 {
      font-size: 1.02rem;
      font-weight: 700;
      letter-spacing: 0.01em;
    }

    .exam-title-group p {
      font-size: 0.76rem;
      color: rgba(255, 255, 255, 0.82);
    }

    .header-center {
      display: flex;
      align-items: center;
      gap: 1.25rem;
      flex-wrap: wrap;
    }

    .progress-pill {
      background: rgba(255, 255, 255, 0.14);
      border: 1px solid rgba(255, 255, 255, 0.25);
      padding: 0.35rem 0.85rem;
      border-radius: 999px;
      font-size: 0.85rem;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 0.6rem;
    }

    .mini-progress-track {
      width: 80px;
      height: 7px;
      background: rgba(255, 255, 255, 0.22);
      border-radius: 999px;
      overflow: hidden;
    }

    .mini-progress-fill {
      height: 100%;
      background: #4ade80;
      width: 0%;
      transition: width 0.25s ease;
    }

    .timer-box {
      background: rgba(15, 23, 42, 0.45);
      border: 1px solid rgba(255, 255, 255, 0.3);
      padding: 0.35rem 0.9rem;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      gap: 0.55rem;
      font-family: var(--font-mono);
      font-size: 1.05rem;
      font-weight: 700;
      letter-spacing: 0.03em;
      transition: all 0.2s ease;
    }

    .timer-box.low-time {
      background: #991b1b;
      border-color: #fca5a5;
      color: #fef2f2;
      animation: pulse-urgent 1s infinite alternate;
    }

    @keyframes pulse-urgent {
      from { transform: scale(1); box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.6); }
      to { transform: scale(1.03); box-shadow: 0 0 0 6px rgba(239, 68, 68, 0); }
    }

    .timer-label {
      font-family: var(--font-sans);
      font-size: 0.72rem;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      opacity: 0.88;
      font-weight: 600;
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 0.6rem;
      flex-wrap: wrap;
    }

    /* BUTTONS */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.45rem;
      font-family: var(--font-sans);
      font-size: 0.85rem;
      font-weight: 600;
      padding: 0.48rem 0.95rem;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      transition: all 0.16s ease;
      text-decoration: none;
      white-space: nowrap;
      user-select: none;
    }

    .btn:focus-visible {
      outline: 3px solid #93c5fd;
      outline-offset: 2px;
    }

    .btn:disabled {
      opacity: 0.48;
      cursor: not-allowed;
    }

    .btn-restart {
      background: #dc2626;
      color: #ffffff;
      border-color: #f87171;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
    }

    .btn-restart:hover:not(:disabled) {
      background: #b91c1c;
    }

    .btn-header-secondary {
      background: rgba(255, 255, 255, 0.14);
      color: #ffffff;
      border-color: rgba(255, 255, 255, 0.3);
    }

    .btn-header-secondary:hover:not(:disabled) {
      background: rgba(255, 255, 255, 0.25);
    }

    .btn-submit-top {
      background: #16a34a;
      color: #ffffff;
      border-color: #4ade80;
    }

    .btn-submit-top:hover:not(:disabled) {
      background: #15803d;
    }

    .btn-primary {
      background: var(--pmi-purple);
      color: #ffffff;
    }

    .btn-primary:hover:not(:disabled) {
      background: var(--pmi-purple-dark);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--text-primary);
      border-color: var(--border-color);
    }

    .btn-outline:hover:not(:disabled) {
      background: #f1f5f9;
      border-color: #94a3b8;
    }

    .btn-flag {
      background: #ffffff;
      color: var(--text-secondary);
      border-color: var(--border-color);
    }

    .btn-flag.flagged {
      background: var(--flag-bg);
      color: #b45309;
      border-color: var(--flag-color);
      font-weight: 700;
    }

    /* WARNING BANNER (<5 MIN OR RESUME NOTIFICATION) */
    .alert-banner {
      padding: 0.6rem 1.25rem;
      font-size: 0.88rem;
      font-weight: 600;
      display: none;
      align-items: center;
      justify-content: space-between;
      gap: 1rem;
    }

    .alert-banner.visible {
      display: flex;
    }

    .alert-banner.warning-5min {
      background: #fef2f2;
      color: #991b1b;
      border-bottom: 2px solid #f87171;
    }

    .alert-banner.info-resume {
      background: #eff6ff;
      color: #1e40af;
      border-bottom: 1px solid #bfdbfe;
    }

    /* MAIN LAYOUT */
    .main-container {
      flex: 1;
      max-width: 1440px;
      width: 100%;
      margin: 0 auto;
      padding: 1.25rem;
      display: flex;
       flex-direction: column;
      gap: 1.25rem;
    }

    /* CONFIG / SETUP BAR */
    .setup-bar {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 0.85rem 1.15rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 1rem;
      box-shadow: var(--shadow-sm);
    }

    .setup-controls {
      display: flex;
      align-items: center;
      gap: 0.85rem;
      flex-wrap: wrap;
    }

    .setup-group {
      display: flex;
      align-items: center;
      gap: 0.45rem;
      font-size: 0.84rem;
      color: var(--text-secondary);
      font-weight: 600;
    }

    .setup-group select,
    .setup-group input {
      font-family: var(--font-sans);
      font-size: 0.84rem;
      padding: 0.36rem 0.6rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #ffffff;
      color: var(--text-primary);
    }

    .pool-stats-pills {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      flex-wrap: wrap;
      font-size: 0.78rem;
    }

    .stat-chip {
      background: var(--pmi-purple-tint);
      color: var(--pmi-purple-dark);
      padding: 0.25rem 0.65rem;
      border-radius: 999px;
      font-weight: 600;
      border: 1px solid rgba(79, 23, 168, 0.18);
    }

    /* EXAM WORKSPACE GRID */
    .exam-workspace {
      display: grid;
      grid-template-columns: 1fr 340px;
      gap: 1.25rem;
      align-items: start;
    }

    /* QUESTION CARD */
    .question-panel {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      min-height: 540px;
    }

    .question-top-bar {
      padding: 1rem 1.35rem;
      border-bottom: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 0.75rem;
      flex-wrap: wrap;
      background: #fafbfc;
      border-radius: var(--radius-md) var(--radius-md) 0 0;
    }

    .q-number-badge {
      font-size: 1.05rem;
      font-weight: 800;
      color: var(--pmi-purple-dark);
      display: flex;
      align-items: center;
      gap: 0.6rem;
    }

    .q-id-tag {
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--text-muted);
      background: #edf2f7;
      padding: 0.15rem 0.5rem;
      border-radius: 4px;
      font-family: var(--font-mono);
    }

    .q-meta-badges {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      flex-wrap: wrap;
    }

    .badge {
      font-size: 0.75rem;
      font-weight: 700;
      padding: 0.22rem 0.65rem;
      border-radius: 999px;
      text-transform: uppercase;
      letter-spacing: 0.03em;
    }

    .badge-domain-people {
      background: #ede9fe;
      color: #5b21b6;
    }

    .badge-domain-process {
      background: #e0f2fe;
      color: #0369a1;
    }

    .badge-domain-business {
      background: #fef3c7;
      color: #92400e;
    }

    .badge-diff-easy {
      background: #dcfce7;
      color: #166534;
    }

    .badge-diff-medium {
      background: #f1f5f9;
      color: #334155;
    }

    .badge-diff-hard {
      background: #fee2e2;
      color: #991b1b;
    }

    .question-body {
      padding: 1.5rem 1.6rem;
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 1.4rem;
    }

    .question-stem {
      font-size: 1.06rem;
      line-height: 1.68;
      color: var(--text-primary);
      white-space: pre-line;
      font-weight: 500;
    }

    .options-list {
      display: flex;
      flex-direction: column;
      gap: 0.75rem;
    }

    .option-row {
      display: flex;
      align-items: stretch;
      gap: 0.5rem;
    }

    .option-card {
      flex: 1;
      display: flex;
      align-items: flex-start;
      gap: 0.9rem;
      padding: 0.95rem 1.15rem;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      background: #ffffff;
      cursor: pointer;
      transition: all 0.15s ease;
      text-align: left;
      font-family: var(--font-sans);
      font-size: 0.98rem;
      color: var(--text-primary);
      line-height: 1.5;
      position: relative;
    }

    .option-card:hover {
      border-color: var(--pmi-purple-light);
      background: #faf8ff;
    }

    .option-card.selected {
      border-color: var(--pmi-purple);
      background: var(--pmi-purple-tint);
      box-shadow: 0 0 0 1px var(--pmi-purple);
    }

    .option-card.struck .option-text {
      text-decoration: line-through;
      color: var(--text-muted);
      opacity: 0.65;
    }

    .option-letter {
      width: 30px;
      height: 30px;
      min-width: 30px;
      border-radius: 50%;
      background: #edf2f7;
      color: var(--text-primary);
      font-weight: 800;
      font-size: 0.88rem;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 1px solid #cbd5e1;
      transition: all 0.15s ease;
      margin-top: 0.05rem;
    }

    .option-card.selected .option-letter {
      background: var(--pmi-purple);
      color: #ffffff;
      border-color: var(--pmi-purple);
    }

    .option-text {
      flex: 1;
      white-space: pre-line;
    }

    .option-key-hint {
      font-size: 0.72rem;
      font-family: var(--font-mono);
      color: var(--text-muted);
      background: #f1f5f9;
      padding: 0.1rem 0.4rem;
      border-radius: 4px;
      border: 1px solid #e2e8f0;
      align-self: center;
    }

    .btn-strike {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 0 0.6rem;
      color: var(--text-muted);
      cursor: pointer;
      font-size: 0.78rem;
      font-weight: 700;
      title: "Cross out option (Strikethrough)";
      transition: all 0.15s ease;
    }

    .btn-strike:hover {
      background: #f1f5f9;
      color: var(--text-primary);
    }

    .btn-strike.active {
      background: #fee2e2;
      color: #991b1b;
      border-color: #fca5a5;
    }

    .question-footer {
      padding: 1rem 1.35rem;
      border-top: 1px solid var(--border-color);
      background: #fafbfc;
      border-radius: 0 0 var(--radius-md) var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 0.75rem;
    }

    .footer-left, .footer-right {
      display: flex;
      align-items: center;
      gap: 0.6rem;
      flex-wrap: wrap;
    }

    /* NAVIGATOR SIDEBAR */
    .navigator-panel {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      padding: 1.1rem;
      display: flex;
      flex-direction: column;
      gap: 0.95rem;
      position: sticky;
      top: 72px;
      max-height: calc(100vh - 92px);
    }

    .nav-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-bottom: 1px solid var(--border-color);
      padding-bottom: 0.65rem;
    }

    .nav-header h2 {
      font-size: 0.95rem;
      font-weight: 800;
      color: var(--pmi-purple-dark);
      text-transform: uppercase;
      letter-spacing: 0.03em;
    }

    .jump-box {
      display: flex;
      align-items: center;
      gap: 0.35rem;
    }

    .jump-box input {
      width: 64px;
      padding: 0.25rem 0.45rem;
      font-size: 0.8rem;
      border: 1px solid var(--border-color);
      border-radius: 4px;
    }

    .nav-legend {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 0.45rem;
      font-size: 0.78rem;
      color: var(--text-secondary);
    }

    .legend-item {
      display: flex;
      align-items: center;
      gap: 0.45rem;
      font-weight: 600;
    }

    .legend-swatch {
      width: 14px;
      height: 14px;
      border-radius: 3px;
      border: 1px solid var(--border-color);
    }

    .swatch-answered { background: var(--pmi-purple); border-color: var(--pmi-purple); }
    .swatch-unanswered { background: #ffffff; border-color: #94a3b8; }
    .swatch-flagged { background: var(--flag-bg); border-color: var(--flag-color); position: relative; }
    .swatch-current { background: #ffffff; border: 2px solid var(--pmi-orange); }

    .nav-filter-tabs {
      display: flex;
      gap: 0.3rem;
      background: #f1f5f9;
      padding: 0.25rem;
      border-radius: var(--radius-sm);
    }

    .nav-filter-btn {
      flex: 1;
      border: none;
      background: transparent;
      font-size: 0.73rem;
      font-weight: 700;
      padding: 0.32rem 0.2rem;
      border-radius: 4px;
      color: var(--text-secondary);
      cursor: pointer;
    }

    .nav-filter-btn.active {
      background: #ffffff;
      color: var(--pmi-purple-dark);
      box-shadow: 0 1px 2px rgba(0,0,0,0.08);
    }

    .nav-grid {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 0.4rem;
      overflow-y: auto;
      padding-right: 0.25rem;
      max-height: 360px;
    }

    .nav-cell {
      height: 36px;
      border-radius: 6px;
      border: 1px solid #cbd5e1;
      background: #ffffff;
      color: var(--text-primary);
      font-size: 0.8rem;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      transition: all 0.12s ease;
    }

    .nav-cell:hover {
      border-color: var(--pmi-purple);
      transform: translateY(-1px);
    }

    .nav-cell.answered {
      background: var(--pmi-purple);
      color: #ffffff;
      border-color: var(--pmi-purple);
    }

    .nav-cell.flagged::after {
      content: "⚑";
      position: absolute;
      top: 1px;
      right: 3px;
      font-size: 0.62rem;
      color: var(--flag-color);
    }

    .nav-cell.answered.flagged::after {
      color: #fde047;
    }

    .nav-cell.current {
      outline: 3px solid var(--pmi-orange);
      outline-offset: 1px;
      z-index: 2;
    }

    .shortcuts-card {
      border-top: 1px solid var(--border-color);
      padding-top: 0.7rem;
      font-size: 0.75rem;
      color: var(--text-muted);
      display: flex;
      flex-wrap: wrap;
      gap: 0.45rem 0.75rem;
    }

    kbd {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 3px;
      padding: 0.08rem 0.35rem;
      font-family: var(--font-mono);
      font-size: 0.7rem;
      color: var(--text-primary);
      font-weight: 700;
    }

    /* RESULTS VIEW */
    .results-container {
      display: none;
      flex-direction: column;
      gap: 1.5rem;
    }

    .results-container.active {
      display: flex;
    }

    .score-hero {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 2rem;
      box-shadow: var(--shadow-md);
      display: grid;
      grid-template-columns: auto 1fr auto;
      gap: 2rem;
      align-items: center;
    }

    .score-circle {
      width: 150px;
      height: 150px;
      border-radius: 50%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      border: 10px solid var(--border-color);
      background: #ffffff;
    }

    .score-circle.pass {
      border-color: var(--success);
      background: var(--success-bg);
      color: var(--success);
    }

    .score-circle.fail {
      border-color: var(--danger);
      background: var(--danger-bg);
      color: var(--danger);
    }

    .score-pct {
      font-size: 2.2rem;
      font-weight: 900;
      line-height: 1.1;
    }

    .score-pass-label {
      font-size: 0.85rem;
      font-weight: 800;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      margin-top: 0.2rem;
    }

    .score-details h2 {
      font-size: 1.5rem;
      font-weight: 800;
      margin-bottom: 0.4rem;
    }

    .score-details p {
      color: var(--text-secondary);
      font-size: 0.95rem;
      margin-bottom: 1rem;
    }

    .kpi-grid {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .kpi-box {
      background: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 0.65rem 1rem;
      min-width: 120px;
    }

    .kpi-box .kpi-val {
      font-size: 1.2rem;
      font-weight: 800;
      color: var(--text-primary);
    }

    .kpi-box .kpi-lbl {
      font-size: 0.74rem;
      color: var(--text-muted);
      text-transform: uppercase;
      font-weight: 700;
    }

    /* DOMAIN BREAKDOWN */
    .domain-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
      gap: 1.15rem;
    }

    .domain-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 1.25rem;
      box-shadow: var(--shadow-sm);
    }

    .domain-card-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 0.65rem;
    }

    .domain-card-header h3 {
      font-size: 1rem;
      font-weight: 800;
    }

    .domain-bar-track {
      height: 10px;
      background: #e2e8f0;
      border-radius: 999px;
      overflow: hidden;
      margin: 0.65rem 0;
    }

    .domain-bar-fill {
      height: 100%;
      border-radius: 999px;
      transition: width 0.4s ease;
    }

    /* REVIEW FILTER BAR */
    .review-controls {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 1rem 1.25rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 1rem;
      box-shadow: var(--shadow-sm);
    }

    .review-filter-group {
      display: flex;
      gap: 0.5rem;
      flex-wrap: wrap;
    }

    .review-filter-btn {
      padding: 0.45rem 0.9rem;
      border-radius: 999px;
      border: 1px solid var(--border-color);
      background: #ffffff;
      font-size: 0.84rem;
      font-weight: 700;
      cursor: pointer;
      color: var(--text-secondary);
      transition: all 0.15s ease;
    }

    .review-filter-btn.active {
      background: var(--pmi-purple);
      color: #ffffff;
      border-color: var(--pmi-purple);
    }

    .review-search {
      display: flex;
      align-items: center;
      gap: 0.6rem;
      flex-wrap: wrap;
    }

    .review-search input,
    .review-search select {
      padding: 0.45rem 0.75rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.85rem;
    }

    .review-list {
      display: flex;
      flex-direction: column;
      gap: 1.15rem;
    }

    .review-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 1.35rem;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }

    .review-item.status-correct { border-left: 5px solid var(--success); }
    .review-item.status-incorrect { border-left: 5px solid var(--danger); }
    .review-item.status-unanswered { border-left: 5px solid var(--warning); }

    .review-opt {
      padding: 0.7rem 1rem;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      font-size: 0.93rem;
      display: flex;
      align-items: flex-start;
      gap: 0.75rem;
    }

    .review-opt.opt-correct {
      background: var(--success-bg);
      border-color: var(--success-border);
      color: #14532d;
      font-weight: 600;
    }

    .review-opt.opt-user-wrong {
      background: var(--danger-bg);
      border-color: var(--danger-border);
      color: #7f1d1d;
    }

    .explanation-box {
      background: #f8fafc;
      border: 1px solid #cbd5e1;
      border-left: 4px solid var(--pmi-purple);
      padding: 1rem 1.15rem;
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      color: var(--text-primary);
      white-space: pre-line;
    }

    .explanation-box strong {
      color: var(--pmi-purple-dark);
      display: block;
      margin-bottom: 0.3rem;
      font-size: 0.82rem;
      text-transform: uppercase;
      letter-spacing: 0.04em;
    }

    /* MODALS */
    .modal-backdrop {
      position: fixed;
      inset: 0;
      background: rgba(15, 23, 42, 0.65);
      display: none;
      align-items: center;
      justify-content: center;
      z-index: 200;
      padding: 1rem;
    }

    .modal-backdrop.open {
      display: flex;
    }

    .modal-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      max-width: 520px;
      width: 100%;
      padding: 1.75rem;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
    }

    .modal-card h3 {
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 0.65rem;
      color: var(--pmi-purple-dark);
    }

    .modal-summary-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 0.75rem;
      margin: 1.1rem 0;
    }

    .modal-stat {
      background: #f8fafc;
      border: 1px solid var(--border-color);
      padding: 0.75rem;
      border-radius: var(--radius-sm);
      text-align: center;
    }

    .modal-stat .val {
      font-size: 1.35rem;
      font-weight: 800;
    }

    .modal-stat .lbl {
      font-size: 0.76rem;
      color: var(--text-muted);
      text-transform: uppercase;
      font-weight: 700;
    }

    .modal-actions {
      display: flex;
      justify-content: flex-end;
      gap: 0.75rem;
      margin-top: 1.25rem;
    }

    @media (max-width: 980px) {
      .exam-workspace {
        grid-template-columns: 1fr;
      }
      .navigator-panel {
        position: static;
        max-height: none;
      }
      .nav-grid {
        grid-template-columns: repeat(10, 1fr);
      }
      .score-hero {
        grid-template-columns: 1fr;
        text-align: center;
        justify-items: center;
      }
      .kpi-grid {
        justify-content: center;
      }
    }

    @media (max-width: 600px) {
      .nav-grid {
        grid-template-columns: repeat(6, 1fr);
      }
      .question-body {
        padding: 1.1rem;
      }
    }

/* ===== additions for the mock-exam app (same palette as the reference) ===== */
.app { flex: 1; display: flex; flex-direction: column; }
.loading { margin: 4rem auto; color: var(--text-muted); }
.exam-title-group h1 { white-space: nowrap; }
.setup-group .chk { display: flex; align-items: center; gap: .35rem; cursor: pointer; }
.setup-group select { max-width: 330px; }
.q-id-tag.src { max-width: 420px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.badge-lesson { background: #ede9fe; color: #5b21b6; }
.badge-flag { background: var(--flag-bg); color: var(--warning); border: 1px solid var(--flag-color); }
.badge-st-correct { background: var(--success-bg); color: var(--success); }
.badge-st-incorrect { background: var(--danger-bg); color: var(--danger); }
.badge-st-unanswered { background: var(--warning-bg); color: var(--warning); }
.q-instr { color: var(--text-muted); font-size: .88rem; font-style: italic; margin-bottom: -.6rem; }
.question-stem select { margin: 0 .2rem; }
.option-card input { position: absolute; opacity: 0; pointer-events: none; }
.option-card:focus-within { outline: 3px solid #93c5fd; outline-offset: 2px; }
.option-card.locked { cursor: default; }
.option-card.locked:hover { background: #fff; border-color: var(--border-color); }
.option-card.selected.locked:not(.correct):not(.wrong) { background: var(--pmi-purple-tint); border-color: var(--pmi-purple); }
.option-card.correct, .option-card.correct:hover { border-color: var(--success); background: var(--success-bg); box-shadow: 0 0 0 1px var(--success); }
.option-card.correct .option-letter { background: var(--success); border-color: var(--success); color: #fff; }
.option-card.wrong, .option-card.wrong:hover { border-color: var(--danger); background: var(--danger-bg); box-shadow: 0 0 0 1px var(--danger); }
.option-card.wrong .option-letter { background: var(--danger); border-color: var(--danger); color: #fff; }
.option-key-hint { margin-left: auto; align-self: center; }
.btn-strike:disabled { opacity: .4; cursor: not-allowed; }
.btn-check { background: #16a34a; color: #fff; border-color: #4ade80; }
.btn-check:hover:not(:disabled) { background: var(--success); }
.badge-diff-medium { background: #fef3c7; color: #92400e; }

.match { width: 100%; border-collapse: collapse; }
.match td { padding: .5rem; border-bottom: 1px solid var(--border-color); vertical-align: middle; }
.match td:first-child { width: 40%; font-weight: 600; }
select { font-family: var(--font-sans); font-size: .9rem; padding: .36rem .6rem; border: 1px solid var(--border-color); border-radius: var(--radius-sm); background: #fff; color: var(--text-primary); max-width: 100%; }
select.ok { border-color: var(--success); background: var(--success-bg); }
select.bad { border-color: var(--danger); background: var(--danger-bg); }
.match select { width: 100%; }
.rightlist { margin: 0 0 .6rem; padding: .7rem 1rem .7rem 2.2rem; font-size: .93rem; background: #f8fafc; border: 1px solid var(--border-color); border-radius: var(--radius-sm); }
input[type="checkbox"], input[type="radio"] { accent-color: var(--pmi-purple); }

.feedback { border-radius: var(--radius-md); padding: 1rem 1.15rem; border: 1px solid #cbd5e1; border-left: 4px solid var(--pmi-purple); background: #f8fafc; }
.feedback.ok { border-color: var(--success-border); border-left-color: var(--success); background: var(--success-bg); }
.feedback.bad { border-color: var(--danger-border); border-left-color: var(--danger); background: var(--danger-bg); }
.feedback h3 { margin: 0 0 .4rem; font-size: .85rem; text-transform: uppercase; letter-spacing: .05em; }
.feedback.ok h3 { color: var(--success); }
.feedback.bad h3 { color: var(--danger); }
.feedback p { margin: .4rem 0; font-size: .93rem; white-space: pre-line; }
.answer-line { margin: .35rem 0; font-size: .93rem; }
.answer-line .lbl { font-weight: 700; }
.answer-line ul { margin: .25rem 0; padding-left: 1.2rem; }
.refbox { margin-top: .7rem; padding: .6rem .85rem; background: #fff; border-left: 4px solid var(--pmi-purple); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; font-size: .85rem; color: var(--text-primary); }
.refbox.external { border-left-color: var(--warning); }
.refbox .tag { font-weight: 700; }
.badge-unv, .badge-ver { color: #fff; border-radius: 3px; padding: 0 .35rem; font-size: .72rem; margin-left: .3rem; }
.badge-unv { background: var(--danger); }
.badge-ver { background: var(--success); }
.banner { padding: .7rem 1rem; border-radius: var(--radius-sm); }
.banner.warn { background: var(--warning-bg); border: 1px solid var(--warning-border); color: #78350f; }
.banner.err { background: var(--danger-bg); border: 1px solid var(--danger-border); color: #7f1d1d; }
.muted { color: var(--text-muted); }
.small { font-size: .85rem; }
code { background: #edf2f7; padding: .1rem .35rem; border-radius: 3px; font-family: var(--font-mono); font-size: .88em; }

/* results extras */
.sec-title { font-size: 1.1rem; font-weight: 800; margin-bottom: .75rem; color: var(--pmi-purple-dark); }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(380px, 1fr)); gap: 1.15rem; }
.stats-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 1.1rem 1.25rem; box-shadow: var(--shadow-sm); }
.stats-card h4 { margin: 0 0 .5rem; font-size: 1rem; font-weight: 800; color: var(--pmi-purple-dark); }
table.stats { width: 100%; border-collapse: collapse; font-size: .9rem; }
table.stats td { padding: .45rem .4rem; border-bottom: 1px solid var(--border-color); }
table.stats td.num { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
table.stats td.barcell { width: 90px; }
table.stats .domain-bar-track { margin: 0; }
.review-head { display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; }
.review-opts { display: flex; flex-direction: column; gap: .5rem; }
.review-opt .option-letter { flex-shrink: 0; }
.review-opt .rv-text { flex: 1; }
.review-opt .rv-tag { font-size: .75rem; font-weight: 700; white-space: nowrap; }
.review-opt.opt-user-wrong .option-letter { background: var(--danger); border-color: var(--danger); color: #fff; }
.review-opt.opt-correct .option-letter { background: var(--success); border-color: var(--success); color: #fff; }
.review-search input[type=search] { min-width: 260px; }

/* modal extras */
.modal-backdrop.cover { background: #0f172a; }
.modal-card { max-height: 90vh; overflow-y: auto; }
.modal-lead { color: var(--text-secondary); font-size: .93rem; }
.modal-warn { color: var(--danger); font-size: .86rem; font-weight: 600; }
.modal-body ul { padding-left: 1.2rem; }
.topic-picker { display: flex; flex-direction: column; gap: .8rem; margin-top: .5rem; }
.tp-lesson { border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: .6rem .9rem; background: #fafbfc; }
.tp-topics { display: grid; grid-template-columns: 1fr; gap: .2rem; margin: .4rem 0 .1rem 1.5rem; font-size: .9rem; }
.tp-topics label, .tp-lesson > label { display: flex; align-items: center; gap: .45rem; cursor: pointer; }

/* ===== navigator alignment fixes ===== */
.nav-header { gap: .6rem; flex-wrap: nowrap; }
.nav-header h2 { white-space: nowrap; font-size: .9rem; }
.jump-box { display: flex; align-items: stretch; gap: .35rem; margin: 0; }
.jump-box input { width: 62px; height: 34px; padding: 0 .5rem; font-size: .82rem; box-sizing: border-box; }
.jump-box .btn { height: 34px; padding: 0 .75rem; font-size: .82rem; }
.nav-legend { grid-template-columns: 1fr 1fr; }
.legend-item { white-space: nowrap; }
.nav-filter-tabs { display: grid; grid-template-columns: repeat(4, 1fr); gap: .25rem; }
.nav-filter-btn { white-space: nowrap; text-align: center; padding: .4rem .1rem; font-size: .7rem; }
.nav-grid { padding: 4px; margin: -4px; overflow-x: hidden; }
.nav-cell { width: 100%; }
.nav-filter-btn { display: flex; align-items: center; justify-content: center; line-height: 1.2; min-height: 28px; }