/* ============================================
   QUIZ BANK STYLES
   The Nursing Collective — Quiz Bank Hub & Engine
   ============================================ */

/* --- CSS Variables (matches main design system) --- */
:root {
    --qb-primary: #2E86AB;
    --qb-primary-dark: #236b8a;
    --qb-secondary: #A23B72;
    --qb-accent: #f59e0b;
    --qb-text: #1f2937;
    --qb-text-secondary: #4b5563;
    --qb-text-light: #9ca3af;
    --qb-bg: #f3f4f6;
    --qb-bg-white: #ffffff;
    --qb-card-bg: #ffffff;
    --qb-border: #e5e7eb;
    --qb-border-light: #f3f4f6;
    --qb-shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --qb-shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --qb-shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --qb-correct: #059669;
    --qb-correct-bg: #ecfdf5;
    --qb-correct-border: #a7f3d0;
    --qb-incorrect: #ef4444;
    --qb-incorrect-bg: #fef2f2;
    --qb-incorrect-border: #fecaca;
    --qb-partial: #f59e0b;
    --qb-partial-bg: #fffbeb;
    --qb-partial-border: #fde68a;
    --qb-type-single: #3b82f6;
    --qb-type-ordering: #6366f1;
    --qb-type-matrix: #14b8a6;
    --qb-radius: 12px;
    --qb-radius-sm: 8px;
    --qb-radius-lg: 16px;
    --qb-transition: 0.25s ease;

    /* New variables for redesign */
    --qb-shadow-card: 0 2px 8px rgba(0, 0, 0, 0.06);
    --qb-shadow-card-hover: 0 4px 16px rgba(0, 0, 0, 0.1);
    --qb-badge-bronze: #CD7F32;
    --qb-badge-silver: #C0C0C0;
    --qb-badge-gold: #FFD700;
    --qb-badge-emerald: #50C878;
    --qb-badge-diamond: #B9F2FF;
}

[data-theme="dark"] {
    --qb-text: #f9fafb;
    --qb-text-secondary: #d1d5db;
    --qb-text-light: #6b7280;
    --qb-bg: #111827;
    --qb-bg-white: #1f2937;
    --qb-card-bg: #1f2937;
    --qb-border: #374151;
    --qb-border-light: #1f2937;
    --qb-shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --qb-shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3);
    --qb-shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3);
    --qb-correct-bg: #064e3b;
    --qb-correct-border: #065f46;
    --qb-incorrect-bg: #7f1d1d;
    --qb-incorrect-border: #991b1b;
    --qb-partial-bg: #78350f;
    --qb-partial-border: #92400e;
    --qb-shadow-card: 0 2px 8px rgba(0, 0, 0, 0.2);
    --qb-shadow-card-hover: 0 4px 16px rgba(0, 0, 0, 0.3);
}

/* ============================================
   LAYOUT
   ============================================ */
.qb-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px 16px 80px;
    min-height: 100vh;
}

@keyframes qb-fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

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

/* ============================================
   WELCOME LANDING (logged-out visitors)
   ============================================ */
.qb-welcome-landing {
    background: linear-gradient(135deg, var(--qb-primary) 0%, #4A90E2 40%, var(--qb-secondary) 100%);
    border-radius: var(--qb-radius-lg);
    padding: 56px 40px;
    text-align: center;
    margin-bottom: 40px;
    animation: qb-fadeIn 0.4s ease;
    position: relative;
    overflow: hidden;
}

.qb-welcome-landing::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(255,255,255,0.12) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255,255,255,0.08) 0%, transparent 50%);
    pointer-events: none;
}

.qb-welcome-content {
    position: relative;
    z-index: 1;
    max-width: 600px;
    margin: 0 auto;
}

.qb-welcome-title {
    font-family: 'Outfit', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    color: #fff;
    margin: 0 0 12px;
    line-height: 1.2;
}

.qb-welcome-desc {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
    margin: 0 0 24px;
}

.qb-welcome-features {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
    margin-bottom: 28px;
}

.qb-welcome-feature {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.88rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.85);
}

.qb-welcome-feature i {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.7);
}

.qb-welcome-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.qb-welcome-actions .qb-btn--lg {
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 10px;
}

.qb-welcome-actions .qb-btn--primary {
    background: #fff;
    color: var(--qb-primary);
    border: none;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.qb-welcome-actions .qb-btn--primary:hover {
    background: #f0f0f0;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.qb-welcome-actions .qb-btn--outline {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.qb-welcome-actions .qb-btn--outline:hover {
    border-color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

.qb-welcome-hint {
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.6);
    margin: 0;
    font-style: italic;
}

@media (max-width: 600px) {
    .qb-welcome-landing {
        padding: 40px 24px;
    }
    .qb-welcome-title {
        font-size: 1.55rem;
    }
    .qb-welcome-features {
        flex-direction: column;
        align-items: center;
        gap: 12px;
    }
    .qb-welcome-actions {
        flex-direction: column;
        align-items: stretch;
    }
}

/* ============================================
   SECTION BASE
   ============================================ */
.qb-section {
    margin-bottom: 56px;
    animation: qb-fadeIn 0.3s ease;
}

.qb-section-title {
    font-family: 'Outfit', 'Source Sans 3', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--qb-text);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.qb-section-title i {
    color: var(--qb-primary);
    font-size: 1.1rem;
}

/* ============================================
   MASTERY RING HERO (Hub Hero Section)
   ============================================ */
.qb-mastery-hero {
    text-align: center;
    margin-bottom: 56px;
    padding-top: 24px;
    animation: qb-fadeIn 0.4s ease;
}

/* ── Profile Avatar inside Mastery Ring ──────── */
.qb-mastery-ring--with-avatar {
    width: 180px;
    height: 180px;
}

.qb-ring-avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
}

.qb-ring-avatar .profile-pic {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: none;
    box-shadow: none;
    object-fit: cover;
    background: var(--qb-bg-white, #fff);
}

[data-theme="dark"] .qb-ring-avatar .profile-pic {
    box-shadow: none;
    background: var(--qb-card-bg, #1f2937);
}

/* Thinner, subtler background track when avatar is inside the ring */
.qb-mastery-ring--with-avatar .qb-mastery-ring-bg {
    stroke-width: 6;
    stroke: var(--qb-border-light);
}
.qb-mastery-ring--with-avatar .qb-mastery-ring-fill {
    stroke-width: 6;
}

/* Greeting + Level below the ring */
.qb-hero-greeting {
    font-family: 'Outfit', sans-serif;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--qb-text);
    margin-top: 12px;
    margin-bottom: 2px;
}

.qb-hero-level-label {
    font-family: 'Outfit', sans-serif;
    font-size: 0.95rem;
    color: var(--qb-text-secondary);
    margin-bottom: 20px;
}

.qb-hero-level-sub {
    color: var(--qb-text-light);
    font-weight: 400;
}

.qb-mastery-ring-wrap {
    display: flex;
    justify-content: center;
    margin-bottom: 24px;
}

.qb-mastery-ring {
    width: 180px;
    height: 180px;
    position: relative;
}

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

.qb-mastery-ring-bg {
    fill: none;
    stroke: var(--qb-border);
    stroke-width: 10;
}

.qb-mastery-ring-fill {
    fill: none;
    stroke: var(--qb-primary);
    stroke-width: 10;
    stroke-linecap: round;
    transition: stroke-dashoffset 1.2s ease;
}

.qb-mastery-ring-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.qb-mastery-ring-level {
    font-family: 'Outfit', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--qb-text);
    line-height: 1;
    display: block;
}

.qb-mastery-ring-label {
    font-size: 0.78rem;
    color: var(--qb-text-secondary);
    margin-top: 4px;
    display: block;
}

/* ============================================
   HUB STATS ROW (below mastery ring)
   ============================================ */
.qb-hero-stats-row {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.qb-hero-stat {
    text-align: center;
}

.qb-hero-stat-value {
    font-family: 'Outfit', sans-serif;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--qb-text);
    line-height: 1.2;
}

.qb-hero-stat-label {
    font-size: 0.78rem;
    color: var(--qb-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: 2px;
}

/* Streak Flame States */
.qb-streak-flame {
    display: inline;
    font-size: 1.4rem;
    vertical-align: middle;
}

.qb-streak-flame--dim {
    color: var(--qb-text-light);
}

.qb-streak-flame--active {
    color: #f59e0b;
    animation: qb-flamePulse 2s ease-in-out infinite;
}

.qb-streak-flame--hot {
    color: #ef4444;
    animation: qb-flamePulse 1.5s ease-in-out infinite;
}

.qb-streak-flame--blazing {
    background: linear-gradient(135deg, #3b82f6, #93c5fd, #ffffff, #93c5fd, #3b82f6);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: qb-flameShimmer 2s ease-in-out infinite;
}

@keyframes qb-flamePulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.15); }
}

@keyframes qb-flameShimmer {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* ============================================
   MASTERY BADGES (CSS-only 28px shields)
   ============================================ */
.qb-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    font-size: 0.65rem;
    font-weight: 700;
    flex-shrink: 0;
    position: relative;
    transition: transform var(--qb-transition);
}

.qb-badge--0 {
    border: 2px dashed var(--qb-text-light);
    background: none;
    color: var(--qb-text-light);
}

.qb-badge--1,
.qb-badge--2 {
    border: 2px solid var(--qb-badge-bronze);
    background: none;
    color: var(--qb-badge-bronze);
    border-radius: 50% 50% 50% 50% / 40% 40% 60% 60%;
}

.qb-badge--3,
.qb-badge--4 {
    border: 2px solid var(--qb-badge-silver);
    background: linear-gradient(135deg, #e8e8e8, #c0c0c0);
    color: #555;
    border-radius: 50% 50% 50% 50% / 40% 40% 60% 60%;
}

.qb-badge--5,
.qb-badge--6 {
    border: 2px solid var(--qb-badge-gold);
    background: linear-gradient(135deg, #fff7cc, #ffd700);
    color: #8b6914;
    border-radius: 50% 50% 50% 50% / 40% 40% 60% 60%;
}

.qb-badge--5::after,
.qb-badge--6::after {
    content: '\f005';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 0.5rem;
    position: absolute;
    top: -4px;
    right: -4px;
    color: var(--qb-badge-gold);
}

.qb-badge--7,
.qb-badge--8 {
    border: 2px solid var(--qb-badge-emerald);
    background: linear-gradient(135deg, #d1fae5, #50c878);
    color: #1a5c34;
    border-radius: 50% 50% 50% 50% / 40% 40% 60% 60%;
}

.qb-badge--7::after,
.qb-badge--8::after {
    content: '\f005 \f005';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 0.4rem;
    position: absolute;
    top: -5px;
    right: -6px;
    color: var(--qb-badge-emerald);
    letter-spacing: -2px;
}

.qb-badge--9 {
    border: 2px solid var(--qb-badge-diamond);
    background: linear-gradient(135deg, #e0f7fa, #b9f2ff, #e0f7fa);
    color: #0e7490;
    border-radius: 50% 50% 50% 50% / 40% 40% 60% 60%;
    box-shadow: 0 0 8px rgba(185, 242, 255, 0.6);
}

.qb-badge--10 {
    border: 2px solid #e5e7eb;
    background: linear-gradient(135deg, #f0f0f0, #d4d4d8, #a1a1aa, #d4d4d8, #f0f0f0);
    background-size: 200% 200%;
    color: #3f3f46;
    border-radius: 50% 50% 50% 50% / 40% 40% 60% 60%;
    animation: qb-platinumPulse 3s ease-in-out infinite;
    box-shadow: 0 0 12px rgba(161, 161, 170, 0.4);
}

.qb-badge--10::after {
    content: 'MASTERED';
    position: absolute;
    bottom: -16px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.5rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    color: #71717a;
    white-space: nowrap;
}

@keyframes qb-platinumPulse {
    0%, 100% { background-position: 0% 50%; box-shadow: 0 0 12px rgba(161, 161, 170, 0.4); }
    50% { background-position: 100% 50%; box-shadow: 0 0 20px rgba(161, 161, 170, 0.6); }
}

/* Results badge row */
.qb-results-badge-row {
    display: flex;
    justify-content: center;
    margin: 16px 0;
}

.qb-results-badge-row .qb-badge {
    width: 56px;
    height: 56px;
    font-size: 1.2rem;
}

/* ============================================
   CHAPTER MASTERY BAR
   ============================================ */
.qb-chapter-bar {
    height: 4px;
    background: var(--qb-border);
    border-radius: 2px;
    overflow: hidden;
    margin: 0 16px 8px;
    width: calc(100% - 32px);
}

.qb-chapter-bar-fill {
    height: 100%;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--qb-primary), var(--qb-secondary));
    transition: width 0.6s ease;
}

/* ============================================
   RUNNING ACCURACY PILL (quiz view)
   ============================================ */
.qb-accuracy-pill {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    transition: background 0.3s ease, color 0.3s ease;
}

.qb-accuracy-pill--good {
    background: var(--qb-correct-bg);
    color: var(--qb-correct);
    border: 1px solid var(--qb-correct-border);
}

.qb-accuracy-pill--ok {
    background: var(--qb-partial-bg);
    color: #92400e;
    border: 1px solid var(--qb-partial-border);
}

.qb-accuracy-pill--low {
    background: var(--qb-incorrect-bg);
    color: var(--qb-incorrect);
    border: 1px solid var(--qb-incorrect-border);
}

/* ============================================
   CORRECT / INCORRECT MICRO-ANIMATIONS
   ============================================ */
@keyframes qb-correctBounce {
    0% { transform: scale(1); }
    30% { transform: scale(1.02); }
    60% { transform: scale(0.99); }
    100% { transform: scale(1); }
}

@keyframes qb-incorrectShake {
    0%, 100% { transform: translateX(0); }
    15% { transform: translateX(-4px); }
    30% { transform: translateX(4px); }
    45% { transform: translateX(-3px); }
    60% { transform: translateX(3px); }
    75% { transform: translateX(-1px); }
    90% { transform: translateX(1px); }
}

.qb-option--animate-correct {
    animation: qb-correctBounce 0.4s ease;
}

.qb-option--animate-incorrect {
    animation: qb-incorrectShake 0.4s ease;
}

/* ============================================
   QUICK START CARD MODIFIERS
   ============================================ */
.qb-quick-card--primary .qb-quick-icon {
    background: linear-gradient(135deg, var(--qb-primary), #60a5fa);
}

.qb-quick-card--warning .qb-quick-icon {
    background: linear-gradient(135deg, #f59e0b, #fbbf24);
}

.qb-quick-card--neutral .qb-quick-icon {
    background: linear-gradient(135deg, #6366f1, #a78bfa);
}

/* ============================================
   CONFETTI ANIMATION
   ============================================ */
.qb-confetti-container {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
    overflow: hidden;
}

.qb-confetti-piece {
    position: absolute;
    top: -5%;
    border-radius: 2px;
    animation: qb-confettiFall 3s ease-in forwards;
    opacity: 0;
}

@keyframes qb-confettiFall {
    0% {
        transform: translateY(-10%) translateX(0) rotate(0deg);
        opacity: 1;
    }
    25% { opacity: 1; }
    100% {
        transform: translateY(110vh) translateX(30px) rotate(720deg);
        opacity: 0;
    }
}

/* ============================================
   CUSTOM BUILDER MODAL
   ============================================ */
.qb-builder-overlay {
    position: fixed;
    inset: 0;
    z-index: 9000;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.qb-builder-overlay--visible {
    opacity: 1;
    pointer-events: auto;
}

.qb-builder-modal {
    background: var(--qb-card-bg);
    border-radius: var(--qb-radius-lg) var(--qb-radius-lg) 0 0;
    max-width: 600px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    padding: 0;
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.2);
    transform: translateY(100%);
    transition: transform 0.35s cubic-bezier(0.33, 1, 0.68, 1);
}

.qb-builder-overlay--visible .qb-builder-modal {
    transform: translateY(0);
}

.qb-builder-modal-header {
    position: sticky;
    top: 0;
    z-index: 2;
    background: var(--qb-card-bg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    border-bottom: 1px solid var(--qb-border);
}

.qb-builder-modal-header .qb-section-title {
    margin: 0;
    font-size: 1.1rem;
}

.qb-builder-close {
    background: none;
    border: none;
    font-size: 1.1rem;
    color: var(--qb-text-light);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: color 0.2s, background 0.2s;
}

.qb-builder-close:hover {
    color: var(--qb-text);
    background: var(--qb-border-light);
}

/* Desktop: center the modal */
@media (min-width: 769px) {
    .qb-builder-overlay {
        align-items: center;
    }

    .qb-builder-modal {
        border-radius: var(--qb-radius-lg);
        max-height: 80vh;
    }
}

/* ============================================
   SECTION A: MASTERY OVERVIEW
   ============================================ */
.qb-stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}

.qb-stat-card {
    background: var(--qb-card-bg);
    border: 1px solid var(--qb-border);
    border-radius: var(--qb-radius);
    padding: 16px;
    text-align: center;
    transition: box-shadow var(--qb-transition);
}

.qb-stat-card:hover {
    box-shadow: var(--qb-shadow-md);
}

.qb-stat-icon {
    font-size: 1.25rem;
    color: var(--qb-primary);
    margin-bottom: 8px;
}

.qb-stat-value {
    font-family: 'Outfit', sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--qb-text);
    line-height: 1.2;
}

.qb-stat-label {
    font-size: 0.8rem;
    color: var(--qb-text-secondary);
    margin-top: 2px;
}

/* Mastery color classes on stat cards */
.qb-stat-card.mastery-red .qb-stat-value { color: #ef4444; }
.qb-stat-card.mastery-yellow .qb-stat-value { color: #f59e0b; }
.qb-stat-card.mastery-green .qb-stat-value { color: #059669; }
.qb-stat-card.mastery-gold .qb-stat-value { color: #a855f7; }

/* Weak / Strong columns */
.qb-weak-strong {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.qb-weak-strong-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--qb-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.qb-weak-strong-title i {
    font-size: 0.8rem;
}

.qb-weak-col .qb-weak-strong-title i { color: var(--qb-accent); }
.qb-strong-col .qb-weak-strong-title i { color: var(--qb-correct); }

.qb-weak-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background: var(--qb-card-bg);
    border: 1px solid var(--qb-border);
    border-radius: var(--qb-radius-sm);
    margin-bottom: 6px;
}

.qb-weak-name {
    font-size: 0.88rem;
    color: var(--qb-text);
}

.qb-weak-level {
    font-size: 0.8rem;
    font-weight: 700;
}

/* Empty State */
.qb-empty-state {
    background: var(--qb-card-bg);
    border: 2px dashed var(--qb-border);
    border-radius: var(--qb-radius-lg);
    padding: 48px 24px;
    text-align: center;
}

.qb-empty-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--qb-primary), var(--qb-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.qb-empty-icon i {
    font-size: 28px;
    color: #fff;
}

.qb-empty-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--qb-text);
    margin-bottom: 8px;
}

.qb-empty-desc {
    font-size: 0.92rem;
    color: var(--qb-text-secondary);
    line-height: 1.5;
    max-width: 440px;
    margin: 0 auto;
}

.qb-empty-actions {
    margin-top: 20px;
}

/* ============================================
   SECTION B: QUICK START CARDS
   ============================================ */
.qb-quick-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.qb-quick-card {
    background: var(--qb-card-bg);
    border: 2px solid var(--qb-border);
    border-radius: var(--qb-radius);
    padding: 24px 16px;
    text-align: center;
    cursor: pointer;
    transition: all var(--qb-transition);
    font-family: inherit;
    color: inherit;
    -webkit-tap-highlight-color: transparent;
    box-shadow: var(--qb-shadow-card);
}

.qb-quick-card:hover:not([disabled]) {
    border-color: var(--qb-primary);
    box-shadow: var(--qb-shadow-card-hover);
    transform: translateY(-3px);
}

.qb-quick-card--disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.qb-quick-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--qb-primary), var(--qb-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
    color: #fff;
    font-size: 1.2rem;
}

.qb-quick-card--disabled .qb-quick-icon {
    background: var(--qb-border);
}

.qb-quick-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    color: var(--qb-text);
    margin-bottom: 4px;
}

.qb-quick-desc {
    font-size: 0.82rem;
    color: var(--qb-text-secondary);
    line-height: 1.4;
}

/* ============================================
   SECTION C: CHAPTERS BROWSER
   ============================================ */
.qb-chapter {
    border: 1px solid var(--qb-border);
    border-radius: var(--qb-radius);
    margin-bottom: 10px;
    overflow: hidden;
    background: var(--qb-card-bg);
    box-shadow: var(--qb-shadow-card);
    transition: box-shadow var(--qb-transition);
}

.qb-chapter:hover {
    box-shadow: var(--qb-shadow-card-hover);
}

.qb-chapter-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 16px;
    width: 100%;
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    text-align: left;
    transition: background var(--qb-transition);
    -webkit-tap-highlight-color: transparent;
}

.qb-chapter-header:hover {
    background: var(--qb-border-light);
}

.qb-chapter-emoji {
    font-size: 1.3rem;
    flex-shrink: 0;
}

.qb-chapter-label {
    font-family: 'Outfit', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    color: var(--qb-text);
    flex: 1;
}

.qb-chapter-meta {
    font-size: 0.78rem;
    color: var(--qb-text-light);
}

.qb-chapter-mastery {
    font-size: 0.8rem;
    font-weight: 700;
}
.qb-chapter-mastery--not-started {
    color: var(--qb-text-light, #9ca3af) !important;
    font-weight: 500;
    font-style: italic;
}

.qb-chapter-badge {
    font-size: 0.72rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.qb-badge-coming-soon {
    background: var(--qb-border-light);
    color: var(--qb-text-light);
}

.qb-chapter-arrow {
    font-size: 0.7rem;
    color: var(--qb-text-light);
    transition: transform var(--qb-transition);
    flex-shrink: 0;
}

.qb-chapter--open .qb-chapter-arrow {
    transform: rotate(180deg);
}

.qb-chapter-topics {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
}

.qb-chapter--open .qb-chapter-topics {
    max-height: 3000px;
}

/* Topics */
.qb-topic {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px 10px 50px;
    border-top: 1px solid var(--qb-border-light);
    transition: background var(--qb-transition);
}

.qb-topic:hover {
    background: rgba(46, 134, 171, 0.02);
}

.qb-topic--locked {
    opacity: 0.6;
}

.qb-topic-info {
    flex: 1;
    min-width: 0;
}

.qb-topic-name {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--qb-text);
    display: block;
}

.qb-topic-mastery-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 4px;
}

.qb-topic-bar {
    flex: 1;
    height: 5px;
    background: var(--qb-border);
    border-radius: 3px;
    overflow: hidden;
    max-width: 120px;
}

.qb-topic-bar-fill {
    height: 100%;
    border-radius: 3px;
    transition: width 0.4s ease;
}

.qb-topic-level {
    font-size: 0.75rem;
    font-weight: 700;
    white-space: nowrap;
}

.qb-topic-coming-soon {
    font-size: 0.75rem;
    color: var(--qb-text-light);
    display: flex;
    align-items: center;
    gap: 4px;
    margin-top: 2px;
}

.qb-topic-start {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    border-radius: var(--qb-radius-sm);
    border: 1px solid var(--qb-primary);
    background: none;
    color: var(--qb-primary);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--qb-transition);
    white-space: nowrap;
    font-family: inherit;
}

.qb-topic-start:hover {
    background: var(--qb-primary);
    color: #fff;
}

.qb-topic-guide-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    color: var(--qb-text-light);
    text-decoration: none;
    transition: all var(--qb-transition);
    flex-shrink: 0;
}

.qb-topic-guide-link:hover {
    color: var(--qb-primary);
    background: rgba(46, 134, 171, 0.08);
}

/* ============================================
   SECTION D: CUSTOM QUIZ BUILDER (inline & modal)
   ============================================ */
.qb-builder-form {
    background: var(--qb-card-bg);
    border: none;
    border-radius: 0;
    padding: 24px;
}

/* When builder is standalone (not in modal), restore card styling */
.qb-builder .qb-builder-form {
    border: 1px solid var(--qb-border);
    border-radius: var(--qb-radius-lg);
}

.qb-builder-group {
    margin-bottom: 20px;
}

.qb-builder-label {
    font-family: 'Outfit', sans-serif;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--qb-text);
    display: block;
    margin-bottom: 8px;
}

.qb-builder-hint {
    font-weight: 400;
    color: var(--qb-text-light);
    font-size: 0.82rem;
}

.qb-builder-desc {
    font-size: 0.78rem;
    color: var(--qb-text-light);
    line-height: 1.45;
    margin-top: 6px;
}

.qb-builder-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.qb-builder-placeholder {
    font-size: 0.85rem;
    color: var(--qb-text-light);
    padding: 8px 0;
}

.qb-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 14px;
    border-radius: 20px;
    border: 1.5px solid #c5ccd6;
    background: var(--qb-bg-white);
    color: var(--qb-text);
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--qb-transition);
    font-family: inherit;
    -webkit-tap-highlight-color: transparent;
}

[data-theme="dark"] .qb-chip {
    border-color: #4b5563;
}

.qb-chip:hover:not([disabled]) {
    border-color: var(--qb-primary);
    color: var(--qb-primary);
    background: rgba(46, 134, 171, 0.06);
}

[data-theme="dark"] .qb-chip:hover:not([disabled]) {
    background: rgba(46, 134, 171, 0.12);
}

.qb-chip--active {
    background: var(--qb-primary);
    border-color: var(--qb-primary);
    color: #fff;
    font-weight: 600;
}

.qb-chip--active:hover:not([disabled]) {
    background: var(--qb-primary-dark);
    border-color: var(--qb-primary-dark);
    color: #fff;
}

.qb-chip[disabled] {
    opacity: 0.35;
    cursor: not-allowed;
    border-style: dashed;
}

.qb-builder-toggles {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.qb-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.88rem;
    color: var(--qb-text);
    cursor: pointer;
}

.qb-toggle input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--qb-primary);
}

.qb-builder-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--qb-border);
}

.qb-builder-count {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--qb-text-secondary);
}

/* ============================================
   BUTTONS
   ============================================ */
.qb-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--qb-radius-sm);
    font-family: 'Source Sans 3', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--qb-transition);
    text-decoration: none;
    min-height: 48px;
    -webkit-tap-highlight-color: transparent;
}

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

.qb-btn--primary {
    background: linear-gradient(135deg, var(--qb-primary), var(--qb-primary-dark));
    color: #fff;
    box-shadow: 0 2px 8px rgba(46, 134, 171, 0.3);
}

.qb-btn--primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(46, 134, 171, 0.4);
}

.qb-btn--primary:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
    background: var(--qb-border);
}
.qb-btn--primary:not(:disabled) {
    animation: qb-btn-appear 0.3s ease;
}
@keyframes qb-btn-appear {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

.qb-btn--secondary {
    background: var(--qb-bg-white);
    color: var(--qb-text);
    border: 2px solid var(--qb-border);
}

.qb-btn--secondary:hover {
    border-color: var(--qb-primary);
    color: var(--qb-primary);
}

.qb-btn--ghost {
    background: transparent;
    color: var(--qb-muted);
    border: none;
    font-size: 0.85rem;
}
.qb-btn--ghost:hover {
    color: var(--qb-text);
    background: var(--qb-bg-alt);
}

.qb-btn--success {
    background: linear-gradient(135deg, #059669, #10b981);
    color: #fff;
}

.qb-btn--success:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(5, 150, 105, 0.3);
}

.qb-btn--lg {
    padding: 14px 32px;
    font-size: 1rem;
}

/* ============================================
   QUIZ VIEW — PROGRESS BAR
   ============================================ */
.qb-quiz-view {
    max-width: 780px;
    margin: 0 auto;
    padding-bottom: 40px;
    animation: qb-fadeIn 0.3s ease;
}

.qb-progress {
    margin-bottom: 24px;
}

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

.qb-progress-text {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--qb-text-secondary);
}

.qb-progress-score {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--qb-text-light);
}

.qb-progress-mode {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 2px 10px;
    border-radius: 12px;
    color: #fff;
}

.qb-progress-mode--practice { background: #059669; }
.qb-progress-mode--exam { background: var(--qb-primary); }

.qb-progress-track {
    width: 100%;
    height: 6px;
    background: var(--qb-border);
    border-radius: 3px;
    overflow: hidden;
}

.qb-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--qb-primary), var(--qb-secondary));
    border-radius: 3px;
    transition: width 0.4s ease;
}

/* ============================================
   QUIZ VIEW — QUESTION CARD
   ============================================ */
.qb-question-card {
    background: var(--qb-card-bg);
    border: 1px solid var(--qb-border);
    border-radius: var(--qb-radius-lg);
    padding: 28px 24px;
    box-shadow: var(--qb-shadow-card);
}

.qb-q-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.qb-q-badge {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--qb-primary), var(--qb-secondary));
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    flex-shrink: 0;
}

.qb-q-type {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    color: #fff;
}

.qb-q-type--single { background: var(--qb-type-single); }
.qb-q-type--ordering { background: var(--qb-type-ordering); }
.qb-q-type--matrix { background: var(--qb-type-matrix); }

.qb-q-difficulty {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--qb-text-light);
    margin-left: auto;
}

.qb-q-stem {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--qb-text);
    margin-bottom: 20px;
}

.qb-q-instruction {
    display: block;
    font-weight: 600;
    font-style: italic;
    margin-top: 6px;
}

.qb-q-instruction--ordering { color: var(--qb-type-ordering); }
.qb-q-instruction--matrix { color: var(--qb-type-matrix); }

/* ============================================
   ANSWER OPTIONS — SINGLE
   ============================================ */
.qb-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 24px;
}

.qb-option {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 16px;
    border: 2px solid var(--qb-border);
    border-radius: var(--qb-radius-sm);
    cursor: pointer;
    transition: all var(--qb-transition);
    min-height: 48px;
    background: var(--qb-card-bg);
    position: relative;
    -webkit-tap-highlight-color: transparent;
}

.qb-option:hover {
    border-color: var(--qb-primary);
    background: rgba(46, 134, 171, 0.04);
    transform: translateX(4px);
    box-shadow: 0 2px 8px rgba(46, 134, 171, 0.1);
}
.qb-option:focus-within { outline: 2px solid var(--qb-primary); outline-offset: -2px; }
.qb-option--selected {
    border-color: var(--qb-primary);
    background: rgba(46, 134, 171, 0.08);
    box-shadow: 0 2px 12px rgba(46, 134, 171, 0.15);
    border-left: 4px solid var(--qb-primary);
}
.qb-option--correct {
    border-color: var(--qb-correct);
    background: var(--qb-correct-bg);
    border-left: 4px solid var(--qb-correct);
    transform: none;
    box-shadow: 0 2px 12px rgba(5, 150, 105, 0.15);
}
.qb-option--incorrect {
    border-color: var(--qb-incorrect);
    background: var(--qb-incorrect-bg);
    border-left: 4px solid var(--qb-incorrect);
    transform: none;
    box-shadow: 0 2px 12px rgba(239, 68, 68, 0.15);
}
.qb-option--disabled { cursor: default; pointer-events: none; transform: none; }
.qb-option--animate-correct {
    animation: qb-pulse-correct 0.4s ease;
}
.qb-option--animate-incorrect {
    animation: qb-shake 0.4s ease;
}
@keyframes qb-pulse-correct {
    0% { transform: scale(1); }
    50% { transform: scale(1.01); }
    100% { transform: scale(1); }
}
@keyframes qb-shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-4px); }
    40% { transform: translateX(4px); }
    60% { transform: translateX(-3px); }
    80% { transform: translateX(2px); }
}

.qb-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.qb-option-marker {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    border: 2px solid var(--qb-border);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--qb-transition);
    margin-top: 1px;
}

.qb-option--selected .qb-option-marker {
    border-color: var(--qb-primary);
    background: var(--qb-primary);
}

.qb-option--selected .qb-option-marker::after {
    content: '';
    width: 8px;
    height: 8px;
    background: #fff;
    border-radius: 50%;
}

.qb-option--correct .qb-option-marker {
    border-color: var(--qb-correct);
    background: var(--qb-correct);
}

.qb-option--correct .qb-option-marker::after {
    content: '';
    width: 6px;
    height: 10px;
    border: solid #fff;
    border-width: 0 2.5px 2.5px 0;
    transform: rotate(45deg);
    margin-top: -2px;
    background: none;
    border-radius: 0;
}

.qb-option--incorrect .qb-option-marker {
    border-color: var(--qb-incorrect);
    background: var(--qb-incorrect);
}

.qb-option--incorrect .qb-option-marker::after {
    content: '\f00d';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 11px;
    color: #fff;
    background: none;
    border-radius: 0;
    width: auto;
    height: auto;
    border: none;
    transform: none;
    margin-top: 0;
}

.qb-option-letter {
    font-weight: 700;
    color: var(--qb-text-secondary);
    flex-shrink: 0;
    min-width: 24px;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    border-radius: 4px;
    transition: all var(--qb-transition);
}
.qb-option:hover .qb-option-letter {
    color: var(--qb-primary);
}
.qb-option--selected .qb-option-letter {
    color: var(--qb-primary);
    font-weight: 800;
}

.qb-option--correct .qb-option-letter,
.qb-option--correct .qb-option-text { color: var(--qb-correct); }
.qb-option--incorrect .qb-option-letter,
.qb-option--incorrect .qb-option-text { color: var(--qb-incorrect); }

.qb-option-text {
    flex: 1;
    font-size: 0.95rem;
    line-height: 1.5;
}

/* ============================================
   ORDERING TYPE
   ============================================ */
.qb-ordering-area { margin-bottom: 24px; }
.qb-ordering-items { display: flex; flex-direction: column; gap: 8px; }

.qb-ordering-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: var(--qb-bg-white);
    border: 2px solid var(--qb-border);
    border-radius: var(--qb-radius-sm);
    cursor: pointer;
    transition: all var(--qb-transition);
    user-select: none;
    min-height: 48px;
}

.qb-ordering-item:hover { border-color: var(--qb-type-ordering); background: rgba(99, 102, 241, 0.04); }

.qb-ordering-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    min-width: 28px;
    border-radius: 50%;
    border: 2px solid var(--qb-border);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--qb-text-light);
    background: var(--qb-bg);
    transition: all var(--qb-transition);
}

.qb-ordering-item--numbered { border-color: var(--qb-type-ordering); background: rgba(99, 102, 241, 0.06); }
.qb-ordering-item--numbered .qb-ordering-badge { background: var(--qb-type-ordering); border-color: var(--qb-type-ordering); color: #fff; }

.qb-ordering-text { flex: 1; font-size: 0.95rem; line-height: 1.5; color: var(--qb-text); }

.qb-ordering-clear {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 8px;
    padding: 6px 12px;
    background: none;
    border: 1px solid var(--qb-border);
    border-radius: var(--qb-radius-sm);
    color: var(--qb-text-light);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--qb-transition);
    font-family: inherit;
}

.qb-ordering-clear:hover { color: var(--qb-type-ordering); border-color: var(--qb-type-ordering); }

.qb-ordering-item--disabled { cursor: default; pointer-events: none; }
.qb-ordering-item--correct { border-color: var(--qb-correct); background: var(--qb-correct-bg); }
.qb-ordering-item--correct .qb-ordering-badge { background: var(--qb-correct); border-color: var(--qb-correct); color: #fff; }
.qb-ordering-item--incorrect { border-color: var(--qb-incorrect); background: var(--qb-incorrect-bg); }
.qb-ordering-item--incorrect .qb-ordering-badge { background: var(--qb-incorrect); border-color: var(--qb-incorrect); color: #fff; }

/* ============================================
   ORDERING — SIDE-BY-SIDE COMPARISON
   ============================================ */
.qb-ordering-compare {
    border: 1px solid var(--qb-border);
    border-radius: var(--qb-radius-sm);
    overflow: hidden;
    margin-bottom: 14px;
}

.qb-ordering-compare-header {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: var(--qb-bg);
}

.qb-ordering-compare-col-title {
    padding: 8px 12px;
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    text-align: center;
}

.qb-ordering-compare-col-title--yours { color: var(--qb-text-secondary); }
.qb-ordering-compare-col-title--correct { color: var(--qb-correct); }

.qb-ordering-compare-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    border-top: 1px solid var(--qb-border-light);
}

.qb-ordering-compare-cell {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    font-size: 0.88rem;
    line-height: 1.4;
    background: var(--qb-card-bg);
}

.qb-ordering-compare-cell--correct { background: var(--qb-correct-bg); }
.qb-ordering-compare-cell--incorrect { background: var(--qb-incorrect-bg); }

.qb-ordering-compare-num {
    width: 24px;
    height: 24px;
    min-width: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
}

.qb-ordering-compare-cell--correct .qb-ordering-compare-num { background: var(--qb-correct); }
.qb-ordering-compare-cell--incorrect .qb-ordering-compare-num { background: var(--qb-incorrect); }

.qb-ordering-compare-text {
    flex: 1;
    color: var(--qb-text);
    min-width: 0;
}

.qb-ordering-compare-icon {
    flex-shrink: 0;
    font-size: 0.8rem;
}

.qb-ordering-compare-cell--correct .qb-ordering-compare-icon { color: var(--qb-correct); }
.qb-ordering-compare-cell--incorrect .qb-ordering-compare-icon { color: var(--qb-incorrect); }

.qb-ordering-step-rationale {
    padding: 6px 12px 10px;
    font-size: 0.82rem;
    line-height: 1.5;
    color: var(--qb-text-secondary);
    background: var(--qb-bg);
    border-top: 1px solid var(--qb-border-light);
}

.qb-ordering-step-rationale-label {
    font-weight: 700;
    color: var(--qb-correct);
}

/* ============================================
   PRE-QUIZ CONFIGURATION PANEL
   ============================================ */
.qb-preconfig {
    max-width: 600px;
    margin: 0 auto;
    animation: qb-fadeIn 0.3s ease;
}

.qb-preconfig-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 0;
    margin-bottom: 16px;
    background: none;
    border: none;
    color: var(--qb-text-secondary);
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    transition: color var(--qb-transition);
}

.qb-preconfig-back:hover { color: var(--qb-primary); }

.qb-preconfig-header {
    text-align: center;
    margin-bottom: 24px;
}

.qb-preconfig-chapter {
    font-size: 0.82rem;
    color: var(--qb-text-light);
    display: block;
    margin-bottom: 4px;
}

.qb-preconfig-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--qb-text);
    margin: 0 0 6px;
}

.qb-preconfig-mastery {
    font-size: 0.9rem;
    font-weight: 600;
}

.qb-preconfig-card {
    background: var(--qb-card-bg);
    border: 1px solid var(--qb-border);
    border-radius: var(--qb-radius-lg);
    padding: 28px 24px;
    box-shadow: var(--qb-shadow-sm);
}

.qb-preconfig-group {
    margin-bottom: 22px;
}

.qb-preconfig-group:last-of-type {
    margin-bottom: 28px;
}

.qb-preconfig-label {
    font-family: 'Outfit', sans-serif;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--qb-text);
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
}

.qb-preconfig-label i {
    color: var(--qb-primary);
    font-size: 0.85rem;
}

.qb-preconfig-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.qb-preconfig-start {
    width: 100%;
}

/* ============================================
   MATRIX TYPE
   ============================================ */
.qb-matrix-wrapper { overflow-x: auto; margin-bottom: 24px; border-radius: var(--qb-radius-sm); border: 1px solid var(--qb-border); }
.qb-matrix-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; min-width: 400px; }
.qb-matrix-table thead { background: var(--qb-bg); }
.qb-matrix-finding-header { text-align: left; padding: 12px 16px; font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--qb-text-secondary); border-bottom: 2px solid var(--qb-border); }
.qb-matrix-col-header { text-align: center; padding: 12px 16px; font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--qb-text-secondary); border-bottom: 2px solid var(--qb-border); min-width: 100px; }
.qb-matrix-row { transition: background var(--qb-transition); }
.qb-matrix-row:not(:last-child) td { border-bottom: 1px solid var(--qb-border-light); }
.qb-matrix-finding { padding: 14px 16px; font-weight: 500; color: var(--qb-text); line-height: 1.5; }
.qb-matrix-cell { text-align: center; padding: 14px 16px; cursor: pointer; transition: background var(--qb-transition); }
.qb-matrix-cell:hover { background: rgba(46, 134, 171, 0.06); }
.qb-matrix-cell input[type="radio"] { position: absolute; opacity: 0; width: 0; height: 0; }
.qb-matrix-radio-marker { display: inline-block; width: 22px; height: 22px; border: 2px solid var(--qb-border); border-radius: 50%; background: var(--qb-bg-white); transition: all var(--qb-transition); position: relative; }
.qb-matrix-cell--selected .qb-matrix-radio-marker { border-color: var(--qb-primary); background: var(--qb-primary); }
.qb-matrix-cell--selected .qb-matrix-radio-marker::after { content: ''; position: absolute; top: 50%; left: 50%; width: 8px; height: 8px; background: #fff; border-radius: 50%; transform: translate(-50%, -50%); }
.qb-matrix-cell--disabled { cursor: default; pointer-events: none; }
.qb-matrix-row--correct { background: var(--qb-correct-bg); }
.qb-matrix-row--correct .qb-matrix-finding { color: var(--qb-correct); font-weight: 600; }
.qb-matrix-row--incorrect { background: var(--qb-incorrect-bg); }
.qb-matrix-row--incorrect .qb-matrix-finding { color: var(--qb-incorrect); }
.qb-matrix-cell--correct-answer .qb-matrix-radio-marker { border-color: var(--qb-correct); background: var(--qb-correct); box-shadow: 0 0 0 3px var(--qb-correct-border); }
.qb-matrix-cell--correct-answer .qb-matrix-radio-marker::after { content: ''; position: absolute; top: 50%; left: 50%; width: 8px; height: 8px; background: #fff; border-radius: 50%; transform: translate(-50%, -50%); }
.qb-matrix-partial { background: var(--qb-partial-bg); border: 1px solid var(--qb-partial-border); color: #92400e; padding: 8px 14px; border-radius: var(--qb-radius-sm); margin-bottom: 12px; font-size: 0.9rem; }
.qb-matrix-partial i { margin-right: 6px; }

/* ============================================
   ACTIONS / SUBMIT
   ============================================ */
.qb-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* ============================================
   FEEDBACK — PRACTICE MODE
   ============================================ */
.qb-feedback {
    margin-top: 24px;
    padding: 20px;
    border-radius: var(--qb-radius);
    border: 1px solid;
    animation: qb-fadeIn 0.3s ease;
}

.qb-feedback--correct { background: var(--qb-correct-bg); border-color: var(--qb-correct-border); }
.qb-feedback--incorrect { background: var(--qb-incorrect-bg); border-color: var(--qb-incorrect-border); }

.qb-feedback-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: 'Outfit', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.qb-feedback--correct .qb-feedback-header { color: var(--qb-correct); }
.qb-feedback--incorrect .qb-feedback-header { color: var(--qb-incorrect); }

.qb-feedback-section { margin-bottom: 14px; }
.qb-feedback-section:last-child { margin-bottom: 0; }
.qb-feedback-label { font-size: 0.85rem; font-weight: 600; color: var(--qb-text-secondary); margin-bottom: 4px; text-transform: uppercase; letter-spacing: 0.03em; }
.qb-feedback-text { font-size: 0.95rem; line-height: 1.6; color: var(--qb-text); }

.qb-feedback-tip {
    background: rgba(59, 130, 246, 0.08);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--qb-radius-sm);
    padding: 14px 16px;
    margin-top: 14px;
}

.qb-feedback-tip-label { display: flex; align-items: center; gap: 6px; font-size: 0.82rem; font-weight: 700; color: #3b82f6; text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 6px; }
.qb-feedback-tip-text { font-size: 0.92rem; line-height: 1.5; color: var(--qb-text); }

.qb-feedback-review {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    margin-top: 14px;
    border-radius: var(--qb-radius-sm);
    background: rgba(46, 134, 171, 0.08);
    color: var(--qb-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all var(--qb-transition);
    border: 1px solid rgba(46, 134, 171, 0.2);
}

.qb-feedback-review:hover { background: rgba(46, 134, 171, 0.14); }

/* ============================================
   EXAM MODE INDICATOR
   ============================================ */
.qb-exam-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 16px;
    padding: 10px 16px;
    border-radius: var(--qb-radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    animation: qb-fadeIn 0.2s ease;
}

.qb-exam-indicator--correct { background: var(--qb-correct-bg); color: var(--qb-correct); border: 1px solid var(--qb-correct-border); }
.qb-exam-indicator--incorrect { background: var(--qb-incorrect-bg); color: var(--qb-incorrect); border: 1px solid var(--qb-incorrect-border); }

/* ============================================
   STICKY NEXT BUTTON
   ============================================ */
.qb-sticky-next {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.92);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-top: 1px solid var(--qb-border);
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.08);
    display: flex;
    justify-content: center;
    animation: qb-slideUp 0.3s ease;
}

.qb-sticky-next .qb-btn { max-width: 400px; width: 100%; }

@keyframes qb-slideUp {
    from { transform: translateY(100%); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

[data-theme="dark"] .qb-sticky-next {
    background: rgba(31, 41, 55, 0.92);
    border-top-color: var(--qb-border);
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.3);
}

/* ============================================
   RESULTS SCREEN
   ============================================ */
.qb-results {
    max-width: 780px;
    margin: 0 auto;
    animation: qb-fadeIn 0.3s ease;
}

/* ── Results top row: two-column on desktop ── */
.qb-results-top {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin-bottom: 24px;
}

.qb-results-score-col {
    text-align: center;
    background: var(--qb-card-bg);
    border: 1px solid var(--qb-border);
    border-radius: var(--qb-radius-lg);
    padding: 24px 20px;
}

.qb-results-side-col {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.qb-results-side-col .qb-mastery-card { margin-bottom: 0; }
.qb-results-side-col .qb-pacing-summary { margin-bottom: 0; }

.qb-score-ring-wrap { display: flex; justify-content: center; margin-bottom: 12px; }
.qb-score-ring { width: 130px; height: 130px; position: relative; }
.qb-score-ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.qb-score-ring-bg { fill: none; stroke: var(--qb-border); stroke-width: 8; }
.qb-score-ring-fill { fill: none; stroke: var(--qb-primary); stroke-width: 8; stroke-linecap: round; transition: stroke-dashoffset 1s ease; }
.qb-score-ring-fill--excellent { stroke: var(--qb-correct); }
.qb-score-ring-fill--good { stroke: var(--qb-primary); }
.qb-score-ring-fill--needs-work { stroke: var(--qb-incorrect); }

.qb-score-center { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); text-align: center; }
.qb-score-value { font-family: 'Outfit', sans-serif; font-size: 2rem; font-weight: 700; color: var(--qb-text); line-height: 1; }
.qb-score-label { font-size: 0.8rem; color: var(--qb-text-secondary); margin-top: 2px; }
.qb-score-pct { font-family: 'Outfit', sans-serif; font-size: 1.2rem; font-weight: 600; color: var(--qb-text); margin-bottom: 4px; }
.qb-perf-msg { font-size: 0.92rem; color: var(--qb-text-secondary); line-height: 1.4; max-width: 380px; margin: 0 auto; }

/* Mastery card */
.qb-mastery-card {
    background: var(--qb-card-bg);
    border: 1px solid var(--qb-border);
    border-radius: var(--qb-radius);
    margin-bottom: 20px;
    overflow: hidden;
    box-shadow: var(--qb-shadow-sm);
}
.qb-mastery-card--leveled {
    border-color: var(--qb-correct);
    box-shadow: 0 0 0 1px var(--qb-correct), var(--qb-shadow-md);
}
.qb-mastery-levelup {
    background: linear-gradient(135deg, #059669, #10b981);
    color: #fff;
    text-align: center;
    padding: 10px 16px;
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}
.qb-mastery-levelup i { font-size: 1.1rem; }
.qb-mastery-card-body { padding: 20px; }
.qb-mastery-topic {
    font-family: 'Outfit', sans-serif;
    font-size: 0.82rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--qb-text-secondary);
    margin-bottom: 8px;
}
.qb-mastery-level-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}
.qb-mastery-level-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 4px 12px;
    border-radius: 20px;
    color: #fff;
    font-family: 'Outfit', sans-serif;
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.3px;
    white-space: nowrap;
}
.qb-mastery-level-name {
    font-family: 'Outfit', sans-serif;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--qb-text);
}
.qb-mastery-progress {
    margin-bottom: 14px;
    position: relative;
}
.qb-mastery-progress-track {
    height: 8px;
    background: var(--qb-border);
    border-radius: 4px;
    overflow: hidden;
}
.qb-mastery-progress-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 1.2s cubic-bezier(0.22, 1, 0.36, 1);
}
.qb-mastery-progress-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--qb-text-light);
    margin-top: 4px;
}

/* Floating +N points animation */
.qb-pts-floater {
    position: absolute;
    top: -4px;
    left: 50%;
    transform: translateX(-50%) translateY(0) scale(0.8);
    background: var(--qb-correct);
    color: #fff;
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
    font-size: 1.1rem;
    padding: 4px 14px;
    border-radius: 20px;
    pointer-events: none;
    white-space: nowrap;
    z-index: 10;
    box-shadow: 0 2px 12px rgba(5, 150, 105, 0.4);
    animation: qb-pts-float 1.8s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes qb-pts-float {
    0% {
        opacity: 0;
        transform: translateX(-50%) translateY(0) scale(0.8);
    }
    15% {
        opacity: 1;
        transform: translateX(-50%) translateY(-10px) scale(1.1);
    }
    30% {
        transform: translateX(-50%) translateY(-20px) scale(1);
    }
    75% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(-48px) scale(0.9);
    }
}

.qb-mastery-earned {
    display: flex;
    align-items: center;
    gap: 8px;
}
.qb-mastery-earned-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--qb-correct-bg);
    color: var(--qb-correct);
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: 1rem;
    padding: 4px 10px;
    border-radius: 6px;
    border: 1px solid var(--qb-correct-border);
}
.qb-mastery-earned-text {
    font-size: 0.88rem;
    color: var(--qb-text-secondary);
}
.qb-mastery-earned-text--zero {
    color: var(--qb-text-light);
    font-style: italic;
}
.qb-mastery-hint {
    margin-top: 10px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--qb-accent);
    display: flex;
    align-items: center;
    gap: 6px;
}
.qb-mastery-multi { margin-bottom: 24px; }
.qb-mastery-multi-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    color: var(--qb-text);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ── Chapter Mastery: Topic Points & Maxed Badge (hub + results) ── */
.qb-topic-pts {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--qb-text-light);
    white-space: nowrap;
}
.qb-topic-maxed {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--qb-correct);
    white-space: nowrap;
}
.qb-topic-maxed i { font-size: 0.65rem; }

/* Mastery card: topic contribution lines */
.qb-mastery-topic-line {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 0;
    border-bottom: 1px solid var(--qb-border);
    font-size: 0.82rem;
}
.qb-mastery-topic-line:last-of-type { border-bottom: none; }
.qb-mastery-topic-line-name {
    flex: 1;
    color: var(--qb-text);
    font-weight: 500;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.qb-mastery-topic-line-gain {
    color: var(--qb-correct);
    font-weight: 700;
    white-space: nowrap;
}
.qb-mastery-topic-line-cap {
    color: var(--qb-text-light);
    font-weight: 600;
    white-space: nowrap;
}

/* "Try other topics" nudge */
.qb-mastery-nudge {
    margin-top: 10px;
    padding: 10px 14px;
    background: var(--qb-info-bg, rgba(59, 130, 246, 0.08));
    border: 1px solid var(--qb-info-border, rgba(59, 130, 246, 0.2));
    border-radius: var(--qb-radius-sm);
    font-size: 0.82rem;
    color: var(--qb-text-secondary);
    line-height: 1.5;
}
.qb-mastery-nudge i {
    color: var(--qb-accent);
    margin-right: 4px;
}
.qb-mastery-nudge strong { color: var(--qb-text); }

/* Results breakdown */
.qb-results-breakdown { margin-bottom: 32px; }
.qb-results-breakdown-title { font-family: 'Outfit', sans-serif; font-size: 1rem; font-weight: 600; color: var(--qb-text); margin-bottom: 12px; }

.qb-result-item {
    border: 1px solid var(--qb-border);
    border-radius: var(--qb-radius-sm);
    margin-bottom: 8px;
    overflow: hidden;
    background: var(--qb-card-bg);
}

.qb-result-summary {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    cursor: pointer;
    transition: background var(--qb-transition);
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    -webkit-tap-highlight-color: transparent;
}

.qb-result-summary:hover { background: var(--qb-border-light); }

.qb-result-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    color: #fff;
    flex-shrink: 0;
}

.qb-result-icon--correct { background: var(--qb-correct); }
.qb-result-icon--incorrect { background: var(--qb-incorrect); }

.qb-result-stem {
    flex: 1;
    font-size: 0.9rem;
    color: var(--qb-text);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.qb-result-expand-icon {
    color: var(--qb-text-light);
    transition: transform var(--qb-transition);
    flex-shrink: 0;
}

.qb-result-item--expanded .qb-result-expand-icon { transform: rotate(180deg); }

.qb-result-detail { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.qb-result-item--expanded .qb-result-detail { max-height: 2000px; }

.qb-result-detail-inner { padding: 0 16px 16px; border-top: 1px solid var(--qb-border); }
.qb-result-rationale { margin-top: 12px; font-size: 0.9rem; line-height: 1.6; color: var(--qb-text); }

.qb-result-review-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 10px;
    color: var(--qb-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.88rem;
}

.qb-result-review-link:hover { text-decoration: underline; }

.qb-results-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 24px;
}

.qb-results-actions .qb-btn {
    width: auto;
    flex: 0 1 auto;
    padding: 10px 18px;
    font-size: 0.88rem;
    min-height: 42px;
    white-space: nowrap;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (min-width: 768px) {
    .qb-container { padding: 24px 24px 60px; }
    .qb-question-card { padding: 32px; }
    .qb-results-top { grid-template-columns: auto 1fr; align-items: start; }
    .qb-results-score-col { min-width: 220px; max-width: 260px; }
}

@media (max-width: 768px) {
    .qb-stats-grid { grid-template-columns: repeat(2, 1fr); }
    .qb-quick-cards { grid-template-columns: 1fr; }
    .qb-weak-strong { grid-template-columns: 1fr; }
    .qb-hero-stats-row { gap: 20px; }
    .qb-hero-stat-value { font-size: 1.4rem; }
    .qb-mastery-ring { width: 150px; height: 150px; }
    .qb-mastery-ring--with-avatar { width: 150px; height: 150px; }
    .qb-ring-avatar .profile-pic { width: 100px; height: 100px; }
    .qb-mastery-ring-level { font-size: 2rem; }
}

@media (max-width: 480px) {
    .qb-container { padding: 16px 12px 90px; }
    .qb-section-title { font-size: 1.15rem; }

    /* Pre-config */
    .qb-preconfig-title { font-size: 1.25rem; }
    .qb-preconfig-card { padding: 20px 16px; }

    /* Ordering compare stacks on narrow screens */
    .qb-ordering-compare-row { grid-template-columns: 1fr; }
    .qb-ordering-compare-header { grid-template-columns: 1fr; }
    .qb-ordering-compare-col-title--correct { border-top: 1px solid var(--qb-border-light); }
    .qb-ordering-compare-cell { font-size: 0.82rem; padding: 8px 10px; }
    .qb-stats-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
    .qb-stat-card { padding: 12px; }
    .qb-stat-value { font-size: 1.15rem; }
    .qb-stat-label { font-size: 0.72rem; }

    .qb-chapter-header { padding: 12px; gap: 8px; }
    .qb-chapter-label { font-size: 0.92rem; }
    .qb-topic { padding: 8px 12px 8px 36px; gap: 8px; }
    .qb-topic-name { font-size: 0.85rem; }
    .qb-topic-start { padding: 5px 10px; font-size: 0.72rem; }

    .qb-builder-form { padding: 16px; }
    .qb-chip { padding: 5px 10px; font-size: 0.78rem; }

    .qb-question-card { padding: 18px 14px; border-radius: var(--qb-radius); }
    .qb-q-header { gap: 8px; margin-bottom: 16px; }
    .qb-q-badge { width: 28px; height: 28px; font-size: 0.8rem; }
    .qb-q-type { font-size: 0.7rem; padding: 2px 8px; }
    .qb-q-stem { font-size: 0.95rem; line-height: 1.6; margin-bottom: 16px; }

    .qb-options { gap: 6px; margin-bottom: 20px; }
    .qb-option { padding: 14px 12px; gap: 10px; min-height: 52px; }
    .qb-option-marker { width: 20px; height: 20px; }
    .qb-option-text { font-size: 0.9rem; }

    .qb-ordering-item { padding: 12px 14px; min-height: 52px; }
    .qb-ordering-badge { width: 26px; height: 26px; min-width: 26px; }

    .qb-matrix-table { font-size: 0.85rem; min-width: 360px; }
    .qb-matrix-finding-header, .qb-matrix-col-header { padding: 10px; font-size: 0.72rem; }
    .qb-matrix-finding { padding: 10px; font-size: 0.85rem; }
    .qb-matrix-cell { padding: 10px 8px; }
    .qb-matrix-radio-marker { width: 20px; height: 20px; }

    .qb-feedback { padding: 16px; margin-top: 20px; }
    .qb-feedback-header { font-size: 1rem; }

    .qb-sticky-next { padding: 10px 12px; }
    .qb-sticky-next .qb-btn { max-width: 100%; min-height: 50px; font-size: 1rem; }

    .qb-score-ring { width: 110px; height: 110px; }
    .qb-score-value { font-size: 1.6rem; }
    .qb-score-pct { font-size: 1rem; }
    .qb-perf-msg { font-size: 0.85rem; }
    .qb-results-score-col { padding: 16px 14px; }
    .qb-mastery-card-body { padding: 16px; }
    .qb-mastery-level-name { font-size: 1.1rem; }
    .qb-mastery-earned { flex-wrap: wrap; }
    .qb-mastery-topic-line { font-size: 0.78rem; gap: 6px; }
    .qb-mastery-nudge { font-size: 0.78rem; padding: 8px 12px; }

    .qb-btn { padding: 12px 18px; font-size: 0.9rem; min-height: 48px; }
    .qb-results-actions { gap: 8px; }
    .qb-results-actions .qb-btn { padding: 8px 14px; font-size: 0.82rem; min-height: 38px; }
}

/* ============================================
   PRINT
   ============================================ */
/* ── Report Question ──────────────────────────── */

.qb-report-link {
    margin-top: 12px;
    text-align: right;
}

.qb-report-btn {
    background: none;
    border: none;
    color: var(--text-muted, #999);
    font-size: 0.8rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: color 0.2s, background 0.2s;
}
.qb-report-btn:hover {
    color: var(--danger-color, #ef4444);
    background: rgba(239, 68, 68, 0.08);
}

.qb-report-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}
.qb-report-overlay--visible { opacity: 1; pointer-events: auto; }

.qb-report-modal {
    background: var(--card-bg, #fff);
    border-radius: 16px;
    width: 90%;
    max-width: 480px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    transform: translateY(20px);
    transition: transform 0.2s ease;
}
.qb-report-overlay--visible .qb-report-modal {
    transform: translateY(0);
}

.qb-report-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color, #e5e7eb);
}
.qb-report-header h3 {
    margin: 0;
    font-size: 1.05rem;
    color: var(--text-color, #1a1a1a);
}
.qb-report-header h3 i { color: var(--danger-color, #ef4444); margin-right: 8px; }

.qb-report-close {
    background: none;
    border: none;
    font-size: 1.1rem;
    color: var(--text-muted, #999);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
}
.qb-report-close:hover { color: var(--text-color, #1a1a1a); background: rgba(0,0,0,0.05); }

.qb-report-body { padding: 20px; }

.qb-report-question-preview {
    background: var(--bg-subtle, #f8f9fa);
    padding: 14px;
    border-radius: 8px;
    font-size: 0.85rem;
    color: var(--text-muted, #666);
    margin-bottom: 16px;
    line-height: 1.4;
    border-left: 3px solid var(--primary-color, #2E86AB);
}

.qb-report-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 8px;
}

.qb-report-meta-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}
.qb-report-meta-tag--id { background: rgba(46, 134, 171, 0.1); color: var(--qb-primary); }
.qb-report-meta-tag--chapter { background: rgba(162, 59, 114, 0.1); color: var(--qb-secondary); }
.qb-report-meta-tag--topic { background: rgba(245, 158, 11, 0.1); color: #b45309; }
.qb-report-meta-tag--type { background: rgba(99, 102, 241, 0.1); color: #6366f1; }
.qb-report-meta-tag--difficulty { background: rgba(107, 114, 128, 0.1); color: #4b5563; }

.qb-report-stem-text {
    font-size: 0.88rem;
    color: var(--qb-text, #1f2937);
    line-height: 1.5;
}

[data-theme="dark"] .qb-report-meta-tag--id { background: rgba(46, 134, 171, 0.2); }
[data-theme="dark"] .qb-report-meta-tag--chapter { background: rgba(162, 59, 114, 0.2); }
[data-theme="dark"] .qb-report-meta-tag--topic { background: rgba(245, 158, 11, 0.15); color: #f59e0b; }
[data-theme="dark"] .qb-report-meta-tag--type { background: rgba(99, 102, 241, 0.2); }
[data-theme="dark"] .qb-report-meta-tag--difficulty { background: rgba(107, 114, 128, 0.2); color: #9ca3af; }

.qb-report-prompt {
    font-weight: 600;
    font-size: 0.95rem;
    margin: 0 0 12px 0;
    color: var(--text-color, #1a1a1a);
}

.qb-report-reasons {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

.qb-report-reason {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border: 1.5px solid var(--border-color, #e5e7eb);
    border-radius: 10px;
    background: var(--card-bg, #fff);
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-color, #1a1a1a);
    transition: border-color 0.15s, background 0.15s;
    text-align: left;
}
.qb-report-reason i { width: 18px; text-align: center; color: var(--text-muted, #999); }
.qb-report-reason:hover { border-color: var(--primary-color, #2E86AB); background: rgba(46, 134, 171, 0.04); }
.qb-report-reason--active {
    border-color: var(--primary-color, #2E86AB);
    background: rgba(46, 134, 171, 0.08);
    font-weight: 500;
}
.qb-report-reason--active i { color: var(--primary-color, #2E86AB); }

.qb-report-details {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid var(--border-color, #e5e7eb);
    border-radius: 10px;
    font-size: 0.9rem;
    font-family: inherit;
    resize: vertical;
    margin-bottom: 16px;
    background: var(--card-bg, #fff);
    color: var(--text-color, #1a1a1a);
    transition: border-color 0.15s;
}
.qb-report-details:focus {
    outline: none;
    border-color: var(--primary-color, #2E86AB);
    box-shadow: 0 0 0 3px rgba(46, 134, 171, 0.12);
}

.qb-report-submit {
    width: 100%;
    padding: 12px;
    font-size: 0.95rem;
}

.qb-report-status {
    text-align: center;
    margin-top: 12px;
    font-size: 0.9rem;
    font-weight: 500;
}
.qb-report-status--success { color: #10b981; }
.qb-report-status--error { color: #ef4444; }

/* Dark mode */
[data-theme="dark"] .qb-report-modal { background: #1e1e2e; }
[data-theme="dark"] .qb-report-header { border-bottom-color: #3a3a4e; }
[data-theme="dark"] .qb-report-header h3 { color: #f0f0f0; }
[data-theme="dark"] .qb-report-close { color: #9ca3af; }
[data-theme="dark"] .qb-report-close:hover { color: #f0f0f0; background: rgba(255,255,255,0.08); }
[data-theme="dark"] .qb-report-question-preview { background: #2a2a3e; color: #c0c6d0; }
[data-theme="dark"] .qb-report-stem-text { color: #e0e4ea; }
[data-theme="dark"] .qb-report-prompt { color: #f0f0f0; }
[data-theme="dark"] .qb-report-reason { background: #1e1e2e; border-color: #3a3a4e; color: #e0e4ea; }
[data-theme="dark"] .qb-report-reason i { color: #9ca3af; }
[data-theme="dark"] .qb-report-reason:hover { background: rgba(46, 134, 171, 0.1); border-color: var(--qb-primary); }
[data-theme="dark"] .qb-report-reason--active { background: rgba(46, 134, 171, 0.15); border-color: var(--qb-primary); }
[data-theme="dark"] .qb-report-reason--active i { color: var(--qb-primary); }
[data-theme="dark"] .qb-report-details { background: #1e1e2e; border-color: #3a3a4e; color: #e0e0e0; }
[data-theme="dark"] .qb-report-details::placeholder { color: #6b7280; }
[data-theme="dark"] .qb-report-submit { background: var(--qb-primary); color: #fff; }
[data-theme="dark"] .qb-report-submit:disabled { opacity: 0.4; }

/* ============================================
   QUIZ HEADER BAR (replaces navbar during quiz)
   ============================================ */
.qb-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 56px;
    background: var(--qb-card-bg);
    border-bottom: 1px solid var(--qb-border);
    box-shadow: var(--qb-shadow-sm);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    animation: qb-fadeIn 0.2s ease;
}

.qb-header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.qb-header-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid var(--qb-border);
    border-radius: var(--qb-radius-sm);
    background: none;
    color: var(--qb-text-secondary);
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    transition: all var(--qb-transition);
    white-space: nowrap;
}
.qb-header-back:hover {
    border-color: var(--qb-primary);
    color: var(--qb-primary);
}

.qb-header-title {
    font-family: 'Outfit', sans-serif;
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--qb-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 260px;
}

.qb-header-center {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.qb-header-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid var(--qb-border);
    border-radius: var(--qb-radius-sm);
    background: none;
    color: var(--qb-text-secondary);
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    transition: all var(--qb-transition);
    white-space: nowrap;
}
.qb-header-btn:hover {
    border-color: var(--qb-primary);
    color: var(--qb-primary);
}
.qb-header-btn--danger:hover {
    border-color: var(--qb-incorrect);
    color: var(--qb-incorrect);
}

/* When quiz header is active, push content down and hide site nav/footer */
body.qb-quiz-active .navbar,
body.qb-quiz-active .footer,
body.qb-quiz-active .mobile-menu-btn { display: none !important; }

body.qb-quiz-active .qb-container {
    padding-top: 72px;
}

@media (max-width: 600px) {
    .qb-header { padding: 0 10px; height: 50px; }
    .qb-header-title { max-width: 120px; font-size: 0.82rem; }
    .qb-header-back span { display: none; }
    .qb-header-btn span { display: none; }
    body.qb-quiz-active .qb-container { padding-top: 66px; }
}

@media print {
    .qb-header,
    .qb-sticky-next,
    .qb-actions,
    .qb-results-actions,
    .qb-quick-start,
    .qb-builder,
    .qb-report-link { display: none; }
    .qb-container { max-width: 100%; padding: 0; }
    .qb-question-card, .qb-result-item { break-inside: avoid; box-shadow: none; }
    .qb-result-detail { max-height: none; }
    .qb-confetti-container { display: none; }
    .qb-levelup-overlay { display: none; }
    .qb-builder-overlay { display: none; }
}

/* ── Subscription Gate Overlay ─────────────────────── */

.qb-gate-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    padding: 20px;
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}

.qb-gate-modal {
    background: var(--card-bg, #fff);
    border-radius: 20px;
    padding: 40px;
    max-width: 420px;
    width: 100%;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.qb-gate-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, #2E86AB, #7B68EE);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 28px;
    color: white;
}

.qb-gate-modal h3 {
    font-size: 1.4rem;
    margin-bottom: 12px;
}

.qb-gate-modal p {
    opacity: 0.7;
    margin-bottom: 24px;
    line-height: 1.5;
}

.qb-gate-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.qb-gate-actions .qb-btn {
    width: 100%;
    text-align: center;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* ============================================
   QUESTION TOOLBAR (flag + timer)
   ============================================ */
.qb-q-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--qb-border-light);
}

.qb-q-toolbar-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.qb-q-toolbar-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* ── Flag / Bookmark ─────────────────────── */
.qb-flag-btn {
    background: none;
    border: 2px solid var(--qb-border);
    border-radius: 8px;
    padding: 6px 12px;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--qb-text-light);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s ease;
}

.qb-flag-btn:hover {
    border-color: var(--qb-accent);
    color: var(--qb-accent);
    background: rgba(245, 158, 11, 0.06);
}

.qb-flag-btn--active {
    border-color: var(--qb-accent);
    color: var(--qb-accent);
    background: rgba(245, 158, 11, 0.1);
}

.qb-flag-btn--active .fa-bookmark { font-weight: 900; }

/* ── Timer ────────────────────────────────── */
.qb-timer {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--qb-text-light);
    font-variant-numeric: tabular-nums;
    padding: 4px 10px;
    border-radius: 6px;
    background: var(--qb-border-light);
}

.qb-timer i {
    font-size: 0.75rem;
    opacity: 0.7;
}

.qb-timer--warning {
    color: var(--qb-accent);
    background: rgba(245, 158, 11, 0.1);
}

/* (kbd hints removed — shortcuts shown in guide bar instead) */

/* ── Flagged question indicator in results ── */
.qb-result-flag {
    color: var(--qb-accent);
    font-size: 0.75rem;
    margin-left: 6px;
}

/* ── Result time per question ─────────────── */
.qb-result-time {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--qb-text-light);
    font-variant-numeric: tabular-nums;
    padding: 2px 8px;
    border-radius: 4px;
    background: var(--qb-border-light);
    flex-shrink: 0;
    margin-right: 4px;
}

/* ── Exam mode: "Answer recorded" ─────────── */
.qb-exam-recorded {
    text-align: center;
    padding: 12px 16px;
    margin-top: 16px;
    color: var(--qb-text-light);
    font-size: 0.9rem;
    font-weight: 500;
    animation: qb-fadeIn 0.2s ease;
}

.qb-exam-recorded i {
    color: var(--qb-primary);
    margin-right: 6px;
}

/* ── Exam review (results page) ──────────── */
.qb-review-stem {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--qb-text);
    padding: 12px 0;
    border-bottom: 1px solid var(--qb-border-light);
    margin-bottom: 10px;
}

.qb-review-options {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 14px;
}

.qb-review-option {
    font-size: 0.85rem;
    line-height: 1.5;
    padding: 8px 12px;
    border-radius: 6px;
    color: var(--qb-text-secondary);
    background: var(--qb-border-light);
}

.qb-review-option--correct {
    background: var(--qb-correct-bg);
    color: var(--qb-correct);
    font-weight: 600;
    border: 1px solid var(--qb-correct-border);
}

.qb-review-option--incorrect {
    background: var(--qb-incorrect-bg);
    color: var(--qb-incorrect);
    font-weight: 600;
    border: 1px solid var(--qb-incorrect-border);
}

.qb-review-option-letter {
    font-weight: 700;
    min-width: 18px;
    display: inline-block;
}

.qb-result-rationale-label,
.qb-result-tip-label {
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.qb-result-rationale-label { color: var(--qb-primary); }
.qb-result-tip-label { color: var(--qb-accent); }

.qb-result-tip {
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--qb-text-secondary);
    padding: 10px 14px;
    background: rgba(245, 158, 11, 0.06);
    border-radius: 8px;
    border-left: 3px solid var(--qb-accent);
    margin-top: 10px;
}

/* ── Per-question pacing tip ──────────────── */
.qb-result-pacing {
    font-size: 0.8rem;
    line-height: 1.5;
    color: var(--qb-accent);
    padding: 8px 12px;
    background: rgba(245, 158, 11, 0.06);
    border-radius: 6px;
    border-left: 3px solid var(--qb-accent);
    margin-top: 10px;
}

.qb-result-pacing i {
    margin-right: 4px;
    opacity: 0.8;
}

/* ── Overall pacing summary card ─────────── */
.qb-pacing-summary {
    background: var(--qb-card-bg);
    border: 1px solid var(--qb-border);
    border-radius: var(--qb-radius-lg);
    padding: 20px;
    margin-bottom: 16px;
}

.qb-pacing-summary-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--qb-text);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.qb-pacing-summary-title i {
    color: var(--qb-primary);
}

.qb-pacing-summary-stats {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.qb-pacing-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 80px;
}

.qb-pacing-stat-value {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--qb-text);
    font-variant-numeric: tabular-nums;
}

.qb-pacing-stat-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--qb-text-light);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.qb-pacing-stat--warn .qb-pacing-stat-value {
    color: var(--qb-accent);
}

.qb-pacing-summary-tip {
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--qb-accent);
    padding: 10px 14px;
    background: rgba(245, 158, 11, 0.06);
    border-radius: 8px;
    border-left: 3px solid var(--qb-accent);
}

.qb-pacing-summary-tip--good {
    color: var(--qb-correct);
    background: rgba(5, 150, 105, 0.06);
    border-left-color: var(--qb-correct);
}

.qb-pacing-summary-tip i {
    margin-right: 6px;
}

/* ── Subtle background for quiz view ──────── */
.qb-quiz-active .qb-container {
    background: radial-gradient(ellipse at 50% 0%, rgba(46, 134, 171, 0.03) 0%, transparent 60%);
}

[data-theme="dark"] .qb-quiz-active .qb-container {
    background: radial-gradient(ellipse at 50% 0%, rgba(46, 134, 171, 0.05) 0%, transparent 60%);
}

/* ============================================
   REVIEW MODE (Study View)
   ============================================ */

.qb-review-mode {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 4px;
}

.qb-review-counter {
    font-family: 'Outfit', sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--qb-text-secondary);
}

.qb-review-context {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.qb-review-chapter-pill {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    border-radius: 20px;
    background: var(--qb-primary);
    color: #fff;
    font-family: 'Outfit', sans-serif;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.03em;
}

.qb-review-topic-pill {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    border-radius: 20px;
    background: rgba(46, 134, 171, 0.1);
    color: var(--qb-primary);
    font-family: 'Outfit', sans-serif;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.03em;
}

.qb-review-card {
    background: var(--qb-card-bg);
    border: 1px solid var(--qb-border);
    border-radius: var(--qb-radius);
    padding: 28px 24px;
    box-shadow: var(--qb-shadow-sm);
    margin-bottom: 16px;
}

.qb-review-card .qb-review-stem {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--qb-text);
    margin-bottom: 20px;
}

/* Review options — reuse qb-option styles but always disabled */
.qb-review-options .qb-option {
    cursor: default;
    pointer-events: none;
}

/* Incorrect option subtle styling in review */
.qb-option--review-wrong {
    opacity: 0.7;
    border-left: 4px solid var(--qb-incorrect);
}
.qb-option--review-wrong .qb-option-marker {
    border-color: var(--qb-incorrect);
    background: var(--qb-incorrect);
}
.qb-option--review-wrong .qb-option-marker::after {
    content: '\f00d';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 11px;
    color: #fff;
    background: none;
    border-radius: 0;
    width: auto;
    height: auto;
    border: none;
    transform: none;
    margin-top: 0;
}

/* Correct/Incorrect tags on review options */
.qb-review-option-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-left: auto;
    padding: 2px 10px;
    border-radius: 12px;
    font-family: 'Outfit', sans-serif;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    white-space: nowrap;
    flex-shrink: 0;
}
.qb-review-option-tag--correct {
    background: var(--qb-correct-bg);
    color: var(--qb-correct);
    border: 1px solid var(--qb-correct-border);
}
.qb-review-option-tag--wrong {
    background: var(--qb-incorrect-bg);
    color: var(--qb-incorrect);
    border: 1px solid var(--qb-incorrect-border, rgba(239, 68, 68, 0.2));
}

/* Review rationale box */
.qb-review-rationale-box {
    margin-top: 24px;
    padding: 20px;
    background: linear-gradient(135deg, rgba(5, 150, 105, 0.06) 0%, rgba(16, 185, 129, 0.04) 100%);
    border: 1px solid var(--qb-correct-border);
    border-radius: var(--qb-radius);
    border-left: 4px solid var(--qb-correct);
}
.qb-review-rationale-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: 'Outfit', sans-serif;
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--qb-correct);
    margin-bottom: 10px;
}
.qb-review-rationale-text {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--qb-text);
}

/* Ordering review */
.qb-review-ordering {
    margin-bottom: 20px;
}

.qb-review-ordering-label {
    font-family: 'Outfit', sans-serif;
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--qb-text-secondary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.qb-review-ordering-step {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 16px;
    background: var(--qb-correct-bg);
    border: 1px solid var(--qb-correct-border);
    border-radius: var(--qb-radius-sm);
    margin-bottom: 6px;
}

.qb-review-ordering-num {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    min-width: 28px;
    border-radius: 50%;
    background: var(--qb-correct);
    color: #fff;
    font-family: 'Outfit', sans-serif;
    font-size: 0.82rem;
    font-weight: 700;
}

.qb-review-ordering-text {
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--qb-text);
    padding-top: 3px;
}

.qb-review-ordering-rationale {
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--qb-text-secondary);
    padding: 4px 16px 8px 56px;
    font-style: italic;
}

/* Matrix review */
.qb-review-matrix {
    margin-bottom: 20px;
}

.qb-review-matrix-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    background: var(--qb-correct-bg);
    border: 1px solid var(--qb-correct-border);
    border-radius: var(--qb-radius-sm);
    margin-bottom: 6px;
}

.qb-review-matrix-finding {
    flex: 1;
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--qb-text);
}

.qb-review-matrix-arrow {
    color: var(--qb-correct);
    font-size: 0.85rem;
}

.qb-review-matrix-answer {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--qb-correct);
}

/* Review actions (remove bookmark) */
.qb-review-actions {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.qb-review-remove {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    border: 1px solid var(--qb-border);
    border-radius: var(--qb-radius-sm);
    background: none;
    color: var(--qb-text-secondary);
    font-family: 'Outfit', sans-serif;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
}

.qb-review-remove:hover {
    border-color: var(--qb-incorrect);
    color: var(--qb-incorrect);
    background: var(--qb-incorrect-bg);
}

/* Review navigation */
.qb-review-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    gap: 12px;
}

@media (max-width: 480px) {
    .qb-review-card { padding: 20px 16px; }
    .qb-review-card .qb-review-stem { font-size: 0.95rem; }
    .qb-review-option-tag { font-size: 0.65rem; padding: 2px 8px; }
    .qb-review-rationale-box { padding: 16px; }
    .qb-review-rationale-text { font-size: 0.9rem; }
    .qb-review-ordering-step { padding: 10px 12px; }
    .qb-review-ordering-rationale { padding-left: 44px; }
    .qb-review-matrix-row { padding: 8px 12px; flex-wrap: wrap; }
    .qb-review-matrix-arrow { display: none; }
    .qb-review-matrix-answer { width: 100%; padding-left: 0; }
}

/* ============================================
   SAVED QUESTIONS (Bookmarks Hub Section)
   ============================================ */

.qb-saved-questions {
    background: var(--qb-card-bg);
    border-radius: 16px;
    padding: 28px;
    box-shadow: var(--qb-shadow-sm);
    border: 1px solid var(--qb-border);
}

.qb-saved-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    height: 24px;
    padding: 0 8px;
    border-radius: 12px;
    background: var(--qb-primary);
    color: #fff;
    font-size: 0.8rem;
    font-weight: 600;
    margin-left: 8px;
    vertical-align: middle;
}

.qb-section-desc {
    color: var(--qb-text-secondary);
    font-size: 0.9rem;
    margin: -8px 0 16px;
}

.qb-saved-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

.qb-saved-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 14px;
    background: var(--qb-bg);
    border-radius: 10px;
    border: 1px solid var(--qb-border-light);
    transition: border-color 0.15s;
}

.qb-saved-item:hover {
    border-color: var(--qb-border);
}

.qb-saved-item-icon {
    color: var(--qb-primary);
    font-size: 0.9rem;
    margin-top: 2px;
    flex-shrink: 0;
}

.qb-saved-item-content {
    flex: 1;
    min-width: 0;
}

.qb-saved-item-topic {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--qb-primary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-bottom: 2px;
}

.qb-saved-item-stem {
    font-size: 0.88rem;
    color: var(--qb-text-secondary);
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.qb-saved-item-remove {
    background: none;
    border: none;
    color: var(--qb-text-light);
    cursor: pointer;
    padding: 4px 6px;
    border-radius: 6px;
    font-size: 0.85rem;
    flex-shrink: 0;
    transition: color 0.15s, background 0.15s;
}

.qb-saved-item-remove:hover {
    color: var(--qb-incorrect);
    background: var(--qb-incorrect-bg);
}

.qb-saved-more {
    text-align: center;
    color: var(--qb-text-light);
    font-size: 0.85rem;
    margin-bottom: 16px;
}

.qb-saved-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

@media (max-width: 480px) {
    .qb-saved-actions {
        flex-direction: column;
    }
    .qb-saved-actions .qb-btn {
        width: 100%;
    }
}

/* ── Tool Buttons (Eliminate, Notes) ─────── */
.qb-tool-btn {
    background: none;
    border: 2px solid var(--qb-border);
    border-radius: 8px;
    padding: 6px 12px;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--qb-text-light);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s ease;
}

.qb-tool-btn:hover {
    border-color: var(--qb-primary);
    color: var(--qb-primary);
    background: rgba(46, 134, 171, 0.06);
}

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

.qb-tool-btn--active:hover {
    background: var(--qb-primary-hover, #256f8f);
}

/* ── Strikethrough / Eliminate Mode ──────── */
.qb-option--eliminate-mode {
    cursor: crosshair;
}

.qb-option--eliminated {
    opacity: 0.45;
    text-decoration: line-through;
    text-decoration-thickness: 2px;
    text-decoration-color: var(--qb-incorrect, #ef4444);
}

.qb-option--eliminated .qb-option-letter {
    opacity: 0.4;
}

/* ── Scratchpad ──────────────────────────── */
.qb-scratchpad {
    border: 2px solid var(--qb-border);
    border-radius: 12px;
    margin-top: 16px;
    overflow: hidden;
    background: var(--qb-surface, #fff);
}

.qb-scratchpad-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--qb-border-light);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--qb-text-secondary);
}

.qb-scratchpad-header i {
    margin-right: 6px;
    color: var(--qb-primary);
}

.qb-scratchpad-close {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--qb-text-light);
    font-size: 0.9rem;
    padding: 2px 6px;
    border-radius: 4px;
    transition: color 0.15s, background 0.15s;
}

.qb-scratchpad-close:hover {
    color: var(--qb-incorrect);
    background: var(--qb-incorrect-bg);
}

.qb-scratchpad-textarea {
    width: 100%;
    border: none;
    padding: 12px 16px;
    font-family: 'Source Sans 3', sans-serif;
    font-size: 0.9rem;
    line-height: 1.5;
    resize: vertical;
    min-height: 80px;
    background: var(--qb-surface, #fff);
    color: var(--qb-text-primary, #1a1a1a);
    outline: none;
}

.qb-scratchpad-textarea::placeholder {
    color: var(--qb-text-light);
}

/* ── Keyboard Shortcut Guide Bar ─────────── */
.qb-shortcut-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 16px;
    padding: 10px 16px;
    margin-top: 20px;
    border-top: 1px solid var(--qb-border-light);
    color: var(--qb-text-light);
    font-size: 0.75rem;
}

.qb-shortcut-item {
    display: flex;
    align-items: center;
    gap: 4px;
    white-space: nowrap;
}

.qb-shortcut-bar kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 5px;
    border-radius: 4px;
    background: var(--qb-border-light);
    border: 1px solid var(--qb-border);
    color: var(--qb-text-secondary);
    font-size: 0.7rem;
    font-weight: 700;
    font-family: 'Source Sans 3', monospace;
    line-height: 1;
}

/* Hide shortcut bar on touch devices */
@media (hover: none) and (pointer: coarse) {
    .qb-shortcut-bar { display: none; }
}

@media (max-width: 480px) {
    .qb-shortcut-bar {
        gap: 10px;
        font-size: 0.7rem;
    }
    .qb-tool-btn span {
        display: none;
    }
    .qb-tool-btn {
        padding: 6px 8px;
    }
}

/* ============================================
   HUB TOP BAR
   ============================================ */

.qb-hub-topbar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 4px 16px;
    margin-bottom: 8px;
    border-bottom: 1px solid var(--qb-border-light, #e5e7eb);
}

.qb-hub-topbar-brand {
    display: flex;
    align-items: center;
    text-decoration: none;
    flex-shrink: 0;
}

.qb-hub-topbar-logo {
    height: 36px;
    width: auto;
    object-fit: contain;
    transition: opacity 0.2s;
}

.qb-hub-topbar-brand:hover .qb-hub-topbar-logo {
    opacity: 0.8;
}

.qb-hub-topbar-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--qb-text, #1f2937);
    flex: 1;
    white-space: nowrap;
}

.qb-hub-topbar-right {
    margin-left: auto;
    position: relative;
    flex-shrink: 0;
}

.qb-hub-topbar-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: 2px solid var(--qb-border-light, #e5e7eb);
    background: var(--qb-surface, #fff);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 0;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.qb-hub-topbar-avatar:hover {
    border-color: var(--qb-primary, #2E86AB);
    box-shadow: 0 0 0 3px rgba(46, 134, 171, 0.15);
}

.qb-hub-topbar-avatar .profile-pic {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.qb-hub-topbar-initial {
    font-family: 'Outfit', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    color: #fff;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--qb-primary, #2E86AB);
    border-radius: 50%;
}

.qb-hub-topbar-signin {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--qb-primary, #2E86AB);
    background: transparent;
    border: 1.5px solid var(--qb-primary, #2E86AB);
    border-radius: 8px;
    text-decoration: none;
    transition: background 0.2s, color 0.2s;
    white-space: nowrap;
}

.qb-hub-topbar-signin:hover {
    background: var(--qb-primary, #2E86AB);
    color: #fff;
}

/* Hub Menu Dropdown */
.qb-hub-menu {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 200px;
    background: var(--qb-surface, #fff);
    border: 1px solid var(--qb-border-light, #e5e7eb);
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.06);
    z-index: 1000;
    overflow: hidden;
    animation: qb-menu-in 0.15s ease-out;
}

.qb-hub-menu--open {
    display: block;
}

@keyframes qb-menu-in {
    from { opacity: 0; transform: translateY(-6px) scale(0.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.qb-hub-menu-header {
    padding: 12px 16px 8px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--qb-text-light, #9ca3af);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-bottom: 1px solid var(--qb-border-light, #e5e7eb);
}

.qb-hub-menu-item {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--qb-text, #1f2937);
    background: transparent;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s;
    text-align: left;
}

.qb-hub-menu-item:hover {
    background: var(--qb-surface-hover, #f3f4f6);
}

.qb-hub-menu-item i {
    width: 18px;
    text-align: center;
    color: var(--qb-text-secondary, #6b7280);
    font-size: 0.88rem;
}

.qb-hub-menu-divider {
    height: 1px;
    background: var(--qb-border-light, #e5e7eb);
    margin: 4px 0;
}

/* Dark Mode */
[data-theme="dark"] .qb-hub-topbar {
    border-bottom-color: var(--qb-border-dark, #374151);
}

[data-theme="dark"] .qb-hub-topbar-avatar {
    border-color: var(--qb-border-dark, #374151);
    background: var(--qb-surface-dark, #1f2937);
}

[data-theme="dark"] .qb-hub-menu {
    background: var(--qb-surface-dark, #1f2937);
    border-color: var(--qb-border-dark, #374151);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

[data-theme="dark"] .qb-hub-menu-header {
    border-bottom-color: var(--qb-border-dark, #374151);
}

[data-theme="dark"] .qb-hub-menu-item:hover {
    background: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .qb-hub-menu-divider {
    background: var(--qb-border-dark, #374151);
}

/* Mobile adjustments */
@media (max-width: 480px) {
    .qb-hub-topbar {
        gap: 8px;
        padding: 10px 2px 12px;
    }
    .qb-hub-topbar-logo {
        height: 30px;
    }
    .qb-hub-topbar-title {
        font-size: 1rem;
    }
    .qb-hub-topbar-avatar {
        width: 34px;
        height: 34px;
    }
    .qb-hub-topbar-signin {
        font-size: 0.82rem;
        padding: 6px 12px;
    }
}