/**
 * Brandlevate CBT — Exam Interface v2.0
 * Modern, distraction-free CBT UI (JAMB/UTME-inspired)
 *
 * HOW TO USE:
 *  Enqueue this file INSTEAD of (or after) front.css for exam pages.
 *  The selectors are scoped to .blv-exam-v2 so existing styles are safe.
 */

/* ═══════════════════════════════════════════════════
   1. CSS VARIABLES
═══════════════════════════════════════════════════ */
:root {
    --blv2-primary:        #1a56db;
    --blv2-primary-dark:   #1e429f;
    --blv2-primary-light:  #ebf5ff;
    --blv2-success:        #057a55;
    --blv2-success-light:  #def7ec;
    --blv2-danger:         #c81e1e;
    --blv2-danger-light:   #fde8e8;
    --blv2-warning:        #c27803;
    --blv2-warning-light:  #fdf6b2;
    --blv2-gray-50:        #f9fafb;
    --blv2-gray-100:       #f3f4f6;
    --blv2-gray-200:       #e5e7eb;
    --blv2-gray-300:       #d1d5db;
    --blv2-gray-400:       #9ca3af;
    --blv2-gray-500:       #6b7280;
    --blv2-gray-700:       #374151;
    --blv2-gray-900:       #111827;
    --blv2-white:          #ffffff;
    --blv2-sidebar-w:      240px;
    --blv2-topbar-h:       56px;
    --blv2-radius:         6px;
    --blv2-radius-lg:      10px;
    --blv2-shadow-sm:      0 1px 2px rgba(0,0,0,.08);
    --blv2-shadow:         0 2px 8px rgba(0,0,0,.10);
    --blv2-shadow-lg:      0 8px 24px rgba(0,0,0,.12);
    --blv2-font:           'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --blv2-transition:     all .18s ease;
}

/* ═══════════════════════════════════════════════════
   2. EXAM SHELL (full-viewport layout)
═══════════════════════════════════════════════════ */
.blv-exam-v2 * { box-sizing: border-box; margin: 0; padding: 0; }

.blv-exam-v2 {
    font-family: var(--blv2-font);
    color: var(--blv2-gray-900);
    background: var(--blv2-gray-50);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-user-select: none;
    user-select: none;           /* disable text selection */
}

/* Disable right-click context menu via CSS (JS handles the event too) */
.blv-exam-v2 { -webkit-context-menu: none; }

/* ═══════════════════════════════════════════════════
   3. TOP BAR
═══════════════════════════════════════════════════ */
.blv2-topbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--blv2-topbar-h);
    background: var(--blv2-primary);
    color: var(--blv2-white);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    z-index: 9000;
    box-shadow: var(--blv2-shadow);
}

.blv2-topbar-left {
    display: flex;
    align-items: center;
    gap: 12px;
    overflow: hidden;
}

.blv2-exam-title {
    font-size: .95rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 280px;
}

.blv2-exam-meta {
    font-size: .78rem;
    opacity: .8;
}

/* Timer */
.blv2-timer {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,.15);
    border-radius: 999px;
    padding: 6px 16px;
    font-size: 1.05rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    letter-spacing: .03em;
    transition: var(--blv2-transition);
}

.blv2-timer.warning  { background: rgba(194,120,3,.35); }
.blv2-timer.critical { background: rgba(200,30,30,.45); animation: blv2-pulse 1s infinite; }

@keyframes blv2-pulse {
    0%, 100% { opacity: 1; }
    50%       { opacity: .6; }
}

.blv2-timer-icon { font-size: 1rem; }

/* Question counter badge */
.blv2-q-counter {
    font-size: .82rem;
    font-weight: 600;
    background: rgba(255,255,255,.2);
    border-radius: 999px;
    padding: 4px 12px;
}

/* ═══════════════════════════════════════════════════
   4. MAIN LAYOUT (topbar + sidebar + content)
═══════════════════════════════════════════════════ */
.blv2-layout {
    display: flex;
    flex: 1;
    margin-top: var(--blv2-topbar-h);
    min-height: calc(100vh - var(--blv2-topbar-h));
}

/* ═══════════════════════════════════════════════════
   5. SIDEBAR – Question Navigator
═══════════════════════════════════════════════════ */
.blv2-sidebar {
    width: var(--blv2-sidebar-w);
    background: var(--blv2-white);
    border-right: 1px solid var(--blv2-gray-200);
    padding: 16px 12px;
    overflow-y: auto;
    position: fixed;
    top: var(--blv2-topbar-h);
    bottom: 0;
    left: 0;
    z-index: 8000;
    box-shadow: var(--blv2-shadow-sm);
}

.blv2-sidebar-title {
    font-size: .75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .07em;
    color: var(--blv2-gray-500);
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--blv2-gray-100);
}

/* Legend */
.blv2-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 14px;
    font-size: .72rem;
    color: var(--blv2-gray-500);
}

.blv2-legend-dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    display: inline-block;
}

.blv2-legend-item { display: flex; align-items: center; gap: 4px; }

/* Grid of question number buttons */
.blv2-q-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 6px;
}

.blv2-q-btn {
    width: 100%;
    aspect-ratio: 1;
    border: 2px solid var(--blv2-gray-200);
    border-radius: var(--blv2-radius);
    background: var(--blv2-white);
    font-size: .8rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--blv2-transition);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--blv2-gray-700);
}

.blv2-q-btn:hover       { border-color: var(--blv2-primary); color: var(--blv2-primary); }
.blv2-q-btn.current     { border-color: var(--blv2-primary); background: var(--blv2-primary); color: #fff; }
.blv2-q-btn.answered    { border-color: var(--blv2-success); background: var(--blv2-success-light); color: var(--blv2-success); }
.blv2-q-btn.flagged     { border-color: var(--blv2-warning); background: var(--blv2-warning-light); color: var(--blv2-warning); }
.blv2-q-btn.unanswered  { border-color: var(--blv2-gray-300); color: var(--blv2-gray-500); }

/* Sidebar footer stats */
.blv2-sidebar-stats {
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--blv2-gray-100);
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: .78rem;
    color: var(--blv2-gray-500);
}

.blv2-stat-row { display: flex; justify-content: space-between; }
.blv2-stat-val { font-weight: 700; color: var(--blv2-gray-900); }

/* ═══════════════════════════════════════════════════
   6. QUESTION AREA
═══════════════════════════════════════════════════ */
.blv2-content {
    flex: 1;
    margin-left: var(--blv2-sidebar-w);
    display: flex;
    flex-direction: column;
    min-height: 100%;
    padding: 24px 32px;
}

.blv2-question-card {
    background: var(--blv2-white);
    border-radius: var(--blv2-radius-lg);
    box-shadow: var(--blv2-shadow);
    padding: 32px;
    flex: 1;
    max-width: 860px;
    width: 100%;
    margin: 0 auto;
}

/* Question header: number + marks + flag button */
.blv2-q-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 20px;
}

.blv2-q-number {
    font-size: .82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--blv2-primary);
    background: var(--blv2-primary-light);
    padding: 4px 12px;
    border-radius: 999px;
}

.blv2-q-marks {
    font-size: .8rem;
    font-weight: 600;
    color: var(--blv2-gray-500);
    background: var(--blv2-gray-100);
    padding: 4px 12px;
    border-radius: 999px;
}

.blv2-flag-btn {
    border: 1.5px solid var(--blv2-gray-300);
    background: none;
    border-radius: var(--blv2-radius);
    padding: 5px 12px;
    font-size: .8rem;
    cursor: pointer;
    color: var(--blv2-gray-500);
    transition: var(--blv2-transition);
    display: flex;
    align-items: center;
    gap: 5px;
}

.blv2-flag-btn:hover,
.blv2-flag-btn.flagged {
    border-color: var(--blv2-warning);
    color: var(--blv2-warning);
    background: var(--blv2-warning-light);
}

/* Question text */
.blv2-q-text {
    font-size: 1.08rem;
    line-height: 1.75;
    color: var(--blv2-gray-900);
    margin-bottom: 28px;
    -webkit-user-select: none;
    user-select: none;
}

.blv2-q-image {
    max-width: 100%;
    border-radius: var(--blv2-radius);
    margin-bottom: 20px;
    box-shadow: var(--blv2-shadow-sm);
}

/* ═══════════════════════════════════════════════════
   7. ANSWER OPTIONS (MCQ)
═══════════════════════════════════════════════════ */
.blv2-options { display: flex; flex-direction: column; gap: 12px; }

.blv2-option {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 18px;
    border: 2px solid var(--blv2-gray-200);
    border-radius: var(--blv2-radius);
    cursor: pointer;
    transition: var(--blv2-transition);
    background: var(--blv2-white);
}

.blv2-option:hover {
    border-color: var(--blv2-primary);
    background: var(--blv2-primary-light);
}

.blv2-option.selected {
    border-color: var(--blv2-primary);
    background: var(--blv2-primary-light);
}

.blv2-option-key {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    border-radius: 50%;
    background: var(--blv2-gray-100);
    border: 2px solid var(--blv2-gray-300);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: .85rem;
    font-weight: 700;
    color: var(--blv2-gray-700);
    transition: var(--blv2-transition);
    text-transform: uppercase;
}

.blv2-option.selected .blv2-option-key {
    background: var(--blv2-primary);
    border-color: var(--blv2-primary);
    color: #fff;
}

.blv2-option-text {
    font-size: .97rem;
    line-height: 1.5;
    color: var(--blv2-gray-900);
}

/* ═══════════════════════════════════════════════════
   8. OTHER QUESTION TYPES
═══════════════════════════════════════════════════ */

/* True / False */
.blv2-tf-options { display: flex; gap: 16px; }

.blv2-tf-btn {
    flex: 1;
    padding: 18px;
    border: 2px solid var(--blv2-gray-200);
    border-radius: var(--blv2-radius-lg);
    background: var(--blv2-white);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    text-align: center;
    transition: var(--blv2-transition);
    color: var(--blv2-gray-700);
}

.blv2-tf-btn:hover            { border-color: var(--blv2-primary); color: var(--blv2-primary); }
.blv2-tf-btn.selected-true    { border-color: var(--blv2-success); background: var(--blv2-success-light); color: var(--blv2-success); }
.blv2-tf-btn.selected-false   { border-color: var(--blv2-danger);  background: var(--blv2-danger-light);  color: var(--blv2-danger); }

/* Short answer / Fill-in-the-blank */
.blv2-text-input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--blv2-gray-200);
    border-radius: var(--blv2-radius);
    font-size: 1rem;
    font-family: var(--blv2-font);
    color: var(--blv2-gray-900);
    transition: var(--blv2-transition);
    resize: none;
    -webkit-user-select: text;
    user-select: text;
}

.blv2-text-input:focus {
    outline: none;
    border-color: var(--blv2-primary);
    box-shadow: 0 0 0 3px rgba(26,86,219,.15);
}

/* Theory (long answer) */
.blv2-theory-input {
    width: 100%;
    min-height: 180px;
    padding: 14px 16px;
    border: 2px solid var(--blv2-gray-200);
    border-radius: var(--blv2-radius);
    font-size: .97rem;
    font-family: var(--blv2-font);
    line-height: 1.7;
    color: var(--blv2-gray-900);
    resize: vertical;
    transition: var(--blv2-transition);
    -webkit-user-select: text;
    user-select: text;
}

.blv2-theory-input:focus {
    outline: none;
    border-color: var(--blv2-primary);
    box-shadow: 0 0 0 3px rgba(26,86,219,.15);
}

.blv2-theory-note {
    font-size: .8rem;
    color: var(--blv2-gray-500);
    margin-top: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

/* Fill-in-the-blank sentence display */
.blv2-fill-sentence {
    font-size: 1.05rem;
    line-height: 2;
    margin-bottom: 16px;
    color: var(--blv2-gray-900);
}

.blv2-blank {
    display: inline-block;
    min-width: 120px;
    border-bottom: 2px solid var(--blv2-primary);
    padding: 2px 8px;
    font-weight: 600;
    color: var(--blv2-primary);
    vertical-align: bottom;
}

/* ═══════════════════════════════════════════════════
   9. NAVIGATION FOOTER
═══════════════════════════════════════════════════ */
.blv2-nav-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 32px;
    padding-top: 20px;
    border-top: 1px solid var(--blv2-gray-100);
    gap: 12px;
    flex-wrap: wrap;
}

.blv2-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: var(--blv2-radius);
    font-size: .92rem;
    font-weight: 600;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--blv2-transition);
    font-family: var(--blv2-font);
}

.blv2-btn-primary {
    background: var(--blv2-primary);
    color: #fff;
    border-color: var(--blv2-primary);
}

.blv2-btn-primary:hover {
    background: var(--blv2-primary-dark);
    border-color: var(--blv2-primary-dark);
}

.blv2-btn-outline {
    background: transparent;
    color: var(--blv2-gray-700);
    border-color: var(--blv2-gray-300);
}

.blv2-btn-outline:hover {
    border-color: var(--blv2-primary);
    color: var(--blv2-primary);
    background: var(--blv2-primary-light);
}

.blv2-btn-danger {
    background: var(--blv2-danger);
    color: #fff;
    border-color: var(--blv2-danger);
}

.blv2-btn-danger:hover { filter: brightness(.92); }

.blv2-btn:disabled {
    opacity: .5;
    cursor: not-allowed;
}

/* ═══════════════════════════════════════════════════
   10. ANTI-CHEAT WARNINGS / MODALS
═══════════════════════════════════════════════════ */
.blv2-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.6);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.blv2-modal {
    background: #fff;
    border-radius: var(--blv2-radius-lg);
    padding: 36px;
    max-width: 440px;
    width: 90%;
    text-align: center;
    box-shadow: var(--blv2-shadow-lg);
}

.blv2-modal-icon { font-size: 3rem; margin-bottom: 12px; }
.blv2-modal h2   { font-size: 1.2rem; margin-bottom: 10px; color: var(--blv2-gray-900); }
.blv2-modal p    { color: var(--blv2-gray-500); font-size: .9rem; line-height: 1.6; margin-bottom: 20px; }

.blv2-violation-badge {
    display: inline-block;
    background: var(--blv2-danger-light);
    color: var(--blv2-danger);
    font-size: 1.8rem;
    font-weight: 700;
    border-radius: var(--blv2-radius);
    padding: 10px 24px;
    margin-bottom: 16px;
}

/* ═══════════════════════════════════════════════════
   11. RESULTS SCREEN
═══════════════════════════════════════════════════ */
.blv2-results {
    text-align: center;
    padding: 48px 32px;
    max-width: 600px;
    margin: 0 auto;
}

.blv2-score-circle {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    border: 8px solid var(--blv2-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
}

.blv2-score-circle.passed { border-color: var(--blv2-success); }
.blv2-score-circle.failed { border-color: var(--blv2-danger); }

.blv2-score-pct  { font-size: 2.4rem; font-weight: 800; line-height: 1; }
.blv2-score-lbl  { font-size: .82rem; color: var(--blv2-gray-500); margin-top: 4px; }

.blv2-result-status {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.blv2-result-status.passed { color: var(--blv2-success); }
.blv2-result-status.failed { color: var(--blv2-danger); }

.blv2-result-detail {
    font-size: .92rem;
    color: var(--blv2-gray-500);
    margin-bottom: 28px;
}

/* Corrections table */
.blv2-corrections {
    text-align: left;
    margin-top: 32px;
}

.blv2-correction-item {
    padding: 16px;
    border-radius: var(--blv2-radius);
    margin-bottom: 12px;
    border-left: 4px solid var(--blv2-gray-200);
}

.blv2-correction-item.correct  { border-left-color: var(--blv2-success); background: var(--blv2-success-light); }
.blv2-correction-item.wrong    { border-left-color: var(--blv2-danger);  background: var(--blv2-danger-light); }

.blv2-corr-q    { font-size: .92rem; font-weight: 600; margin-bottom: 8px; }
.blv2-corr-meta { display: flex; gap: 16px; font-size: .82rem; }
.blv2-corr-your { color: var(--blv2-danger); }
.blv2-corr-ans  { color: var(--blv2-success); }
.blv2-corr-exp  { color: var(--blv2-gray-500); font-style: italic; margin-top: 6px; font-size: .82rem; }

/* ═══════════════════════════════════════════════════
   12. LOADING / SPINNER
═══════════════════════════════════════════════════ */
.blv2-spinner {
    width: 40px; height: 40px;
    border: 4px solid var(--blv2-gray-200);
    border-top-color: var(--blv2-primary);
    border-radius: 50%;
    animation: blv2-spin .7s linear infinite;
    margin: 32px auto;
}

@keyframes blv2-spin { to { transform: rotate(360deg); } }

/* ═══════════════════════════════════════════════════
   13. RESPONSIVE (MOBILE)
═══════════════════════════════════════════════════ */
@media (max-width: 768px) {
    :root { --blv2-sidebar-w: 0px; }

    .blv2-sidebar {
        width: 100%;
        height: auto;
        max-height: 40vh;
        position: relative;
        top: auto; left: auto;
        border-right: none;
        border-bottom: 1px solid var(--blv2-gray-200);
        order: -1;
    }

    .blv2-layout       { flex-direction: column; }
    .blv2-content      { margin-left: 0; padding: 16px; }
    .blv2-question-card{ padding: 20px 16px; }
    .blv2-tf-options   { flex-direction: column; }

    .blv2-topbar       { padding: 0 12px; }
    .blv2-exam-title   { max-width: 140px; font-size: .85rem; }
    .blv2-timer        { padding: 5px 12px; font-size: .92rem; }

    .blv2-q-grid       { grid-template-columns: repeat(7, 1fr); }
    .blv2-nav-footer   { flex-direction: column-reverse; }
    .blv2-btn          { width: 100%; justify-content: center; }
}

/* ═══════════════════════════════════════════════════
   14. PRINT (hide exam UI chrome)
═══════════════════════════════════════════════════ */
@media print {
    .blv2-topbar,
    .blv2-sidebar,
    .blv2-nav-footer { display: none !important; }

    .blv2-content  { margin-left: 0; }
    .blv2-question-card { box-shadow: none; border: 1px solid #ccc; }
}