/* ===============================================
   STUDY HUB - LEARNING SECTION
   AI-Powered Geography Learning Academy
   =============================================== */

/* ─── Breadcrumb ─── */
.learn-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}
.learn-breadcrumb__item {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
    display: flex;
    align-items: center;
    gap: 4px;
}
.learn-breadcrumb__item:hover {
    color: var(--accent-purple);
}
.learn-breadcrumb__item--active {
    color: var(--text-primary);
    font-weight: 600;
}
.learn-breadcrumb__sep {
    color: var(--text-muted);
    font-size: 0.75rem;
    opacity: 0.5;
}

/* ─── Category Selection ─── */
.learn-hero {
    position: relative;
    padding: 40px 44px;
    border-radius: 24px;
    background: linear-gradient(135deg, #059669 0%, #10B981 40%, #34D399 100%);
    color: white;
    margin-bottom: 36px;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(5, 150, 105, 0.25);
}
.learn-hero::before {
    content: '';
    position: absolute;
    top: -80%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 50%;
    pointer-events: none;
}
.learn-hero::after {
    content: '';
    position: absolute;
    bottom: -60%;
    left: 5%;
    width: 260px;
    height: 260px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 50%;
    pointer-events: none;
}
.learn-hero__content {
    position: relative;
    z-index: 1;
}
.learn-hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 14px;
    background: rgba(255,255,255,0.18);
    border: 1px solid rgba(255,255,255,0.25);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    margin-bottom: 16px;
    backdrop-filter: blur(8px);
}
.learn-hero__badge i {
    font-size: 0.9rem;
}
.learn-hero__title {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 8px;
    color: #fff;
    line-height: 1.2;
}
.learn-hero__desc {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.85);
    margin: 0;
    max-width: 520px;
    line-height: 1.5;
}

/* ─── Category Cards ─── */
.learn-categories {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

.learn-category-card {
    position: relative;
    padding: 32px 28px;
    border-radius: 20px;
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    text-decoration: none;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    min-height: 200px;
}
.learn-category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    opacity: 0;
    transition: opacity 0.3s;
}
.learn-category-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 40px rgba(0,0,0,0.1);
    border-color: transparent;
}
[data-theme="dark"] .learn-category-card:hover {
    box-shadow: 0 16px 40px rgba(0,0,0,0.35);
}
.learn-category-card:hover::before {
    opacity: 1;
}
.learn-category-card--human::before {
    background: linear-gradient(90deg, #10b981, #34d399);
}
.learn-category-card--physical::before {
    background: linear-gradient(90deg, #3b82f6, #60a5fa);
}

.learn-category-card__icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: 20px;
    transition: transform 0.3s;
}
.learn-category-card:hover .learn-category-card__icon {
    transform: scale(1.1) rotate(-3deg);
}
.learn-category-card--human .learn-category-card__icon {
    background: rgba(16,185,129,0.1);
    color: #10b981;
}
.learn-category-card--physical .learn-category-card__icon {
    background: rgba(59,130,246,0.1);
    color: #3b82f6;
}

.learn-category-card__title {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
}
.learn-category-card__desc {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin: 0 0 16px;
    line-height: 1.5;
    flex: 1;
}
.learn-category-card__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.learn-category-card__meta {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}
.learn-category-card__arrow {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: all 0.25s;
}
.learn-category-card--human .learn-category-card__arrow {
    background: rgba(16,185,129,0.08);
    color: #10b981;
}
.learn-category-card--physical .learn-category-card__arrow {
    background: rgba(59,130,246,0.08);
    color: #3b82f6;
}
.learn-category-card:hover .learn-category-card__arrow {
    color: white;
}
.learn-category-card--human:hover .learn-category-card__arrow {
    background: #10b981;
}
.learn-category-card--physical:hover .learn-category-card__arrow {
    background: #3b82f6;
}

/* Coming Soon overlay */
.learn-category-card--locked {
    opacity: 0.7;
    cursor: default;
}
.learn-category-card--locked:hover {
    transform: none;
    box-shadow: none;
    border-color: var(--border-glass);
}
.learn-category-card__coming-soon {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    background: rgba(245,158,11,0.12);
    color: #f59e0b;
    border-radius: 20px;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ─── Unit Cards Grid ─── */
.learn-units-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}
.learn-units-header__title {
    display: flex;
    align-items: center;
    gap: 10px;
}
.learn-units-header__title h2 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}
.learn-units-header__title i {
    font-size: 1.4rem;
    color: var(--accent-purple);
}
.learn-units-header__progress {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.82rem;
    color: var(--text-muted);
    font-weight: 500;
}
.learn-units-header__progress-bar {
    width: 120px;
    height: 6px;
    border-radius: 6px;
    background: var(--border-glass);
    overflow: hidden;
}
.learn-units-header__progress-fill {
    height: 100%;
    border-radius: 6px;
    background: var(--gradient-primary);
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.learn-units-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.learn-unit-card {
    position: relative;
    padding: 0;
    border-radius: 18px;
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    text-decoration: none;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}
.learn-unit-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0,0,0,0.08);
    border-color: transparent;
}
[data-theme="dark"] .learn-unit-card:hover {
    box-shadow: 0 12px 32px rgba(0,0,0,0.35);
}

.learn-unit-card__accent {
    height: 4px;
    width: 100%;
    transition: height 0.3s;
}
.learn-unit-card:hover .learn-unit-card__accent {
    height: 5px;
}

.learn-unit-card__body {
    padding: 24px 22px 20px;
}

.learn-unit-card__number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 10px;
    font-size: 0.82rem;
    font-weight: 800;
    font-family: var(--font-heading);
    margin-bottom: 14px;
}

.learn-unit-card__title {
    font-family: var(--font-heading);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
    line-height: 1.3;
}
.learn-unit-card__desc {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin: 0 0 16px;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.learn-unit-card__meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}
.learn-unit-card__topics {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 5px;
}
.learn-unit-card__topics i {
    font-size: 0.9rem;
}
.learn-unit-card__progress {
    display: flex;
    align-items: center;
    gap: 8px;
}
.learn-unit-card__progress-bar {
    width: 60px;
    height: 5px;
    border-radius: 5px;
    background: var(--border-glass);
    overflow: hidden;
}
.learn-unit-card__progress-fill {
    height: 100%;
    border-radius: 5px;
    background: var(--gradient-primary);
    transition: width 0.5s;
}
.learn-unit-card__progress-text {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--accent-purple);
}

/* Unit accent colors */
.learn-unit-card[data-color="emerald"] .learn-unit-card__accent { background: linear-gradient(90deg, #059669, #34d399); }
.learn-unit-card[data-color="emerald"] .learn-unit-card__number { background: rgba(16,185,129,0.12); color: #10b981; }

.learn-unit-card[data-color="blue"] .learn-unit-card__accent { background: linear-gradient(90deg, #2563eb, #60a5fa); }
.learn-unit-card[data-color="blue"] .learn-unit-card__number { background: rgba(59,130,246,0.12); color: #3b82f6; }

.learn-unit-card[data-color="purple"] .learn-unit-card__accent { background: linear-gradient(90deg, #7c3aed, #a78bfa); }
.learn-unit-card[data-color="purple"] .learn-unit-card__number { background: rgba(139,92,246,0.12); color: #8b5cf6; }

.learn-unit-card[data-color="amber"] .learn-unit-card__accent { background: linear-gradient(90deg, #d97706, #fbbf24); }
.learn-unit-card[data-color="amber"] .learn-unit-card__number { background: rgba(245,158,11,0.12); color: #f59e0b; }

.learn-unit-card[data-color="rose"] .learn-unit-card__accent { background: linear-gradient(90deg, #e11d48, #fb7185); }
.learn-unit-card[data-color="rose"] .learn-unit-card__number { background: rgba(244,63,94,0.12); color: #f43f5e; }

.learn-unit-card[data-color="teal"] .learn-unit-card__accent { background: linear-gradient(90deg, #0d9488, #5eead4); }
.learn-unit-card[data-color="teal"] .learn-unit-card__number { background: rgba(20,184,166,0.12); color: #14b8a6; }

.learn-unit-card[data-color="indigo"] .learn-unit-card__accent { background: linear-gradient(90deg, #4338ca, #818cf8); }
.learn-unit-card[data-color="indigo"] .learn-unit-card__number { background: rgba(99,102,241,0.12); color: #6366f1; }

/* ─── Topics List (inside a unit) ─── */
.learn-topics-panel {
    margin-bottom: 40px;
}
.learn-topics-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 10px;
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    font-size: 0.88rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 20px;
}
.learn-topics-back:hover {
    border-color: var(--accent-purple);
    color: var(--accent-purple);
}
.learn-topics-back i {
    font-size: 1rem;
}

.learn-topics-unit-banner {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px 28px;
    border-radius: 18px;
    margin-bottom: 24px;
    overflow: hidden;
    position: relative;
}
.learn-topics-unit-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 200px;
    height: 200px;
    background: rgba(255,255,255,0.06);
    border-radius: 50%;
}
.learn-topics-unit-banner__number {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: rgba(255,255,255,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 800;
    font-family: var(--font-heading);
    color: white;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
}
.learn-topics-unit-banner__info {
    position: relative;
    z-index: 1;
}
.learn-topics-unit-banner__title {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    color: white;
    margin: 0 0 4px;
}
.learn-topics-unit-banner__meta {
    font-size: 0.82rem;
    color: rgba(255,255,255,0.8);
    margin: 0;
}

.learn-topics-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.learn-topic-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 18px 22px;
    border-radius: 14px;
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    text-decoration: none;
    transition: all 0.25s;
    cursor: pointer;
}
.learn-topic-item:hover {
    border-color: var(--accent-purple);
    box-shadow: 0 4px 16px rgba(0,0,0,0.05);
    transform: translateX(4px);
}
[data-theme="dark"] .learn-topic-item:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,0.25);
}
.learn-topic-item__index {
    width: 32px;
    height: 32px;
    border-radius: 10px;
    background: var(--border-glass);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-muted);
    flex-shrink: 0;
    font-family: var(--font-heading);
}
.learn-topic-item__info {
    flex: 1;
    min-width: 0;
}
.learn-topic-item__title {
    font-weight: 600;
    font-size: 0.92rem;
    color: var(--text-primary);
    margin-bottom: 2px;
}
.learn-topic-item__duration {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}
.learn-topic-item__status {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    flex-shrink: 0;
    transition: all 0.2s;
}
.learn-topic-item__status--pending {
    background: var(--border-glass);
    color: var(--text-muted);
}
.learn-topic-item__status--done {
    background: rgba(16,185,129,0.12);
    color: #10b981;
}
.learn-topic-item:hover .learn-topic-item__status--pending {
    background: rgba(16,185,129,0.08);
    color: var(--accent-purple);
}

/* ─── LESSON PAGE ─── */
.learn-lesson {
    max-width: 820px;
    margin: 0 auto;
    padding-bottom: 80px;
}

.learn-lesson__header {
    margin-bottom: 36px;
}
.learn-lesson__unit-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 14px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.learn-lesson__title {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.25;
    margin-bottom: 12px;
}
.learn-lesson__meta {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}
.learn-lesson__meta-item {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.82rem;
    color: var(--text-muted);
    font-weight: 500;
}
.learn-lesson__meta-item i {
    font-size: 1rem;
    color: var(--accent-purple);
}

/* Lesson Content Blocks */
.learn-block {
    margin-bottom: 32px;
    padding: 28px;
    border-radius: 18px;
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    transition: box-shadow 0.25s;
}
.learn-block:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,0.04);
}
[data-theme="dark"] .learn-block:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

.learn-block__header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 18px;
}
.learn-block__icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}
.learn-block__title {
    font-family: var(--font-heading);
    font-size: 1.08rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

/* Block type colors */
.learn-block--intro .learn-block__icon { background: rgba(16,185,129,0.1); color: #10b981; }
.learn-block--concepts .learn-block__icon { background: rgba(59,130,246,0.1); color: #3b82f6; }
.learn-block--why .learn-block__icon { background: rgba(245,158,11,0.1); color: #f59e0b; }
.learn-block--visual .learn-block__icon { background: rgba(139,92,246,0.1); color: #8b5cf6; }
.learn-block--takeaways .learn-block__icon { background: rgba(16,185,129,0.1); color: #10b981; }
.learn-block--mistakes .learn-block__icon { background: rgba(244,63,94,0.1); color: #f43f5e; }
.learn-block--olympiad .learn-block__icon { background: rgba(245,158,11,0.1); color: #f59e0b; }
.learn-block--review .learn-block__icon { background: rgba(99,102,241,0.1); color: #6366f1; }

/* Accent bar on left of special blocks */
.learn-block--olympiad {
    border-left: 4px solid #f59e0b;
}
.learn-block--mistakes {
    border-left: 4px solid #f43f5e;
}

.learn-block__text {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 12px;
}
.learn-block__text:last-child {
    margin-bottom: 0;
}

.learn-block__list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.learn-block__list li {
    position: relative;
    padding: 8px 0 8px 24px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.55;
    border-bottom: 1px solid rgba(0,0,0,0.03);
}
[data-theme="dark"] .learn-block__list li {
    border-bottom-color: rgba(255,255,255,0.04);
}
.learn-block__list li:last-child {
    border-bottom: none;
}
.learn-block__list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 14px;
    width: 8px;
    height: 8px;
    border-radius: 3px;
    background: var(--accent-purple);
    opacity: 0.5;
}

/* Highlighted term */
.learn-term {
    font-weight: 700;
    color: var(--accent-purple);
    background: rgba(16,185,129,0.08);
    padding: 1px 6px;
    border-radius: 4px;
}

/* Visual placeholder */
.learn-visual-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 12px;
    min-height: 200px;
    border-radius: 14px;
    background: var(--bg-dark);
    border: 2px dashed var(--border-glass);
    color: var(--text-muted);
    font-size: 0.88rem;
    font-weight: 500;
    text-align: center;
    padding: 24px;
}
.learn-visual-placeholder i {
    font-size: 2.5rem;
    opacity: 0.4;
}
.learn-visual-placeholder span {
    opacity: 0.7;
}

/* Lesson navigation at bottom */
.learn-lesson__nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-top: 48px;
    padding-top: 28px;
    border-top: 1px solid var(--border-glass);
}
.learn-lesson__nav-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 22px;
    border-radius: 14px;
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    font-size: 0.88rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.25s;
}
.learn-lesson__nav-btn:hover {
    border-color: var(--accent-purple);
    color: var(--accent-purple);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.learn-lesson__nav-btn--primary {
    background: var(--gradient-primary);
    border: none;
    color: white;
}
.learn-lesson__nav-btn--primary:hover {
    color: white;
    box-shadow: 0 4px 16px rgba(16,185,129,0.3);
}
.learn-lesson__nav-btn i {
    font-size: 1.1rem;
}

/* ─── QUESTION BANK (Coming Soon) ─── */
.learn-qbank {
    text-align: center;
    padding: 60px 20px;
}

.learn-qbank__hero {
    position: relative;
    padding: 48px 40px;
    border-radius: 24px;
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    margin-bottom: 32px;
    overflow: hidden;
}
.learn-qbank__hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 350px;
    height: 350px;
    background: rgba(16,185,129,0.04);
    border-radius: 50%;
}
.learn-qbank__hero-icon {
    width: 80px;
    height: 80px;
    border-radius: 24px;
    background: rgba(16,185,129,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: var(--accent-purple);
    margin: 0 auto 24px;
    position: relative;
    z-index: 1;
}
.learn-qbank__hero-title {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 10px;
    position: relative;
    z-index: 1;
}
.learn-qbank__hero-desc {
    font-size: 0.95rem;
    color: var(--text-muted);
    max-width: 440px;
    margin: 0 auto 24px;
    line-height: 1.5;
    position: relative;
    z-index: 1;
}
.learn-qbank__coming-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    background: rgba(245,158,11,0.1);
    border: 1px solid rgba(245,158,11,0.2);
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 700;
    color: #f59e0b;
    position: relative;
    z-index: 1;
}
.learn-qbank__coming-badge i {
    font-size: 1.1rem;
}

/* Search bar placeholder */
.learn-qbank__search {
    max-width: 560px;
    margin: 0 auto 28px;
    position: relative;
}
.learn-qbank__search input {
    width: 100%;
    padding: 14px 20px 14px 48px;
    border-radius: 14px;
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    font-size: 0.92rem;
    font-family: var(--font-body);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.learn-qbank__search input:focus {
    border-color: var(--accent-purple);
    box-shadow: 0 0 0 3px rgba(16,185,129,0.1);
}
.learn-qbank__search input::placeholder {
    color: var(--text-muted);
}
.learn-qbank__search i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.15rem;
    color: var(--text-muted);
}

/* Filters */
.learn-qbank__filters {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 36px;
}
.learn-qbank__filter {
    padding: 9px 18px;
    border-radius: 10px;
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    font-family: var(--font-body);
    cursor: not-allowed;
    opacity: 0.6;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
}
.learn-qbank__filter i {
    font-size: 0.95rem;
}

/* Placeholder cards */
.learn-qbank__cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 18px;
    max-width: 880px;
    margin: 0 auto;
}
.learn-qbank__card-placeholder {
    padding: 28px 22px;
    border-radius: 16px;
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    opacity: 0.5;
    text-align: left;
}
.learn-qbank__card-placeholder-bar {
    height: 10px;
    border-radius: 5px;
    background: var(--border-glass);
    margin-bottom: 12px;
}
.learn-qbank__card-placeholder-bar--short {
    width: 60%;
}
.learn-qbank__card-placeholder-bar--medium {
    width: 85%;
}
.learn-qbank__card-placeholder-bar--long {
    width: 95%;
}
.learn-qbank__card-placeholder-circle {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: var(--border-glass);
    margin-bottom: 14px;
}

/* ─── Fade-in animations ─── */
@keyframes learnFadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes learnFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
.learn-animate {
    animation: learnFadeUp 0.5s ease both;
}
.learn-animate--delay-1 { animation-delay: 0.1s; }
.learn-animate--delay-2 { animation-delay: 0.2s; }
.learn-animate--delay-3 { animation-delay: 0.3s; }
.learn-animate--delay-4 { animation-delay: 0.4s; }
.learn-animate--delay-5 { animation-delay: 0.5s; }
.learn-animate--delay-6 { animation-delay: 0.6s; }
.learn-animate--delay-7 { animation-delay: 0.7s; }

/* ─── RESPONSIVE ─── */
@media (max-width: 1100px) {
    .learn-units-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .learn-hero {
        padding: 28px 24px;
    }
    .learn-hero__title {
        font-size: 1.6rem;
    }
    .learn-lesson__title {
        font-size: 1.6rem;
    }
}

@media (max-width: 768px) {
    .learn-categories {
        grid-template-columns: 1fr;
    }
    .learn-units-grid {
        grid-template-columns: 1fr;
    }
    .learn-lesson__nav {
        flex-direction: column;
    }
    .learn-lesson__nav-btn {
        width: 100%;
        justify-content: center;
    }
    .learn-qbank__cards {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .learn-hero {
        padding: 24px 20px;
        border-radius: 18px;
    }
    .learn-hero__title {
        font-size: 1.35rem;
    }
    .learn-block {
        padding: 20px 18px;
    }
    .learn-lesson__title {
        font-size: 1.35rem;
    }
    .learn-qbank__hero {
        padding: 32px 20px;
    }
}

/* ─── VOCABULARY SYSTEM ─── */
.learn-vocab {
    color: #10b981;
    font-weight: 700;
    cursor: pointer;
    background: rgba(16, 185, 129, 0.08);
    padding: 1px 6px;
    border-radius: 4px;
    border-bottom: 2px solid rgba(16, 185, 129, 0.3);
    transition: all 0.2s;
    display: inline-block;
}
.learn-vocab:hover {
    background: rgba(16, 185, 129, 0.15);
    border-bottom-color: #10b981;
    transform: translateY(-1px);
}

.learn-vocab-popover {
    position: absolute;
    z-index: 9999;
    width: 280px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: 16px;
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.15);
    padding: 18px;
    display: none;
    opacity: 0;
    transform: translateY(10px) scale(0.95);
    transition: all 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    pointer-events: none;
}
[data-theme="dark"] .learn-vocab-popover {
    background: rgba(30, 41, 59, 0.95);
    border-color: rgba(16, 185, 129, 0.3);
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.4);
}
.learn-vocab-popover.active {
    display: block;
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.learn-vocab-popover__title {
    font-size: 0.7rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #10b981;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}
.learn-vocab-popover__title::before {
    content: '';
    width: 6px;
    height: 6px;
    background: #10b981;
    border-radius: 50%;
}
.learn-vocab-popover__text {
    font-size: 0.9rem;
    color: var(--text-primary);
    line-height: 1.6;
    font-weight: 500;
}

.learn-vocab-popover__arrow {
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 16px;
    height: 8px;
    overflow: hidden;
}
.learn-vocab-popover__arrow::after {
    content: "";
    position: absolute;
    width: 10px;
    height: 10px;
    background: rgba(255, 255, 255, 0.95);
    transform: translateX(-50%) translateY(-50%) rotate(45deg);
    top: 0;
    left: 50%;
    border: 1px solid rgba(16, 185, 129, 0.2);
}
[data-theme="dark"] .learn-vocab-popover__arrow::after {
    background: rgba(30, 41, 59, 0.95);
    border-color: rgba(16, 185, 129, 0.3);
}

/* ─── LESSON IMAGES & GALLERIES ─── */
.learn-block__image {
    margin-top: 18px;
    border-radius: 14px;
    overflow: hidden;
    border: 1px solid var(--border-glass);
    background: #f8fafc;
}
[data-theme="dark"] .learn-block__image {
    background: #0f172a;
}
.learn-block__image img {
    width: 100%;
    height: auto;
    display: block;
    mix-blend-mode: multiply; /* Helps blend white-background diagrams into light mode */
}
[data-theme="dark"] .learn-block__image img {
    mix-blend-mode: normal;
    opacity: 0.9;
}

.learn-block__gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-top: 20px;
}
.learn-block__gallery-item {
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-glass);
    background: #fff;
    padding: 8px;
    transition: transform 0.25s;
}
.learn-block__gallery-item:hover {
    transform: scale(1.02);
}
.learn-block__gallery-item img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 8px;
}

/* ─── SIDEBAR & FOCUS MODE (COLLAPSE) ─── */
.study-sidebar {
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.study-main {
    transition: margin-left 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-collapsed .study-sidebar {
    transform: translateX(-100%);
}

.sidebar-collapsed .study-main {
    margin-left: 0 !important;
}

/* Centered Reading Layout in Focus Mode */
@media (min-width: 1024px) {
    .sidebar-collapsed .learn-lesson {
        max-width: 900px;
        margin: 0 auto;
        padding-top: 40px;
    }
}

/* UI Cleanup: Fixing Overlaps */
.study-topbar {
    z-index: 100;
}

.learn-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

#sidebarMinimizer {
    color: var(--text-muted);
    transition: all 0.2s;
}

#sidebarMinimizer:hover {
    color: #10b981;
    background: rgba(16, 185, 129, 0.1);
}

.sidebar-collapsed #sidebarMinimizer {
    color: #10b981;
}

/* ─── VIDEO MINI-PLAYER (PiP) ─── */
.learn-mini-player {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 340px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: 20px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
    z-index: 5000;
    display: none;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.3s, transform 0.3s, box-shadow 0.2s;
    overflow: hidden;
}

[data-theme="dark"] .learn-mini-player {
    background: rgba(30, 41, 59, 0.95);
    border-color: rgba(16, 185, 129, 0.3);
}

.learn-mini-player.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.learn-mini-player.dragging {
    transition: none;
    cursor: grabbing;
    box-shadow: 0 30px 70px rgba(0, 0, 0, 0.4);
    opacity: 0.9;
}

.learn-mini-player__handle {
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: grab;
    background: rgba(16, 185, 129, 0.08);
    border-bottom: 1px solid var(--border-glass);
}

.learn-mini-player__handle span {
    font-size: 0.7rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-primary);
}

.learn-mini-player__handle i {
    color: #10b981;
    font-size: 1.2rem;
}

.learn-mini-player__close {
    margin-left: auto;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    width: 28px;
    height: 28px;
    border-radius: 50%;
}

.learn-mini-player__close:hover {
    color: #f43f5e;
    background: rgba(244, 63, 94, 0.1);
}

.learn-mini-player__content {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: #000;
}

.learn-mini-player__content iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* ─── VIDEO MINI-PLAYER RESIZER ─── */
.learn-mini-player__resizer {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 24px;
    height: 24px;
    cursor: nwse-resize;
    background: linear-gradient(135deg, transparent 50%, rgba(16, 185, 129, 0.4) 50%);
    display: flex;
    align-items: flex-end;
    justify-content: flex-end;
    padding: 3px;
    z-index: 10;
    transition: all 0.2s;
}

.learn-mini-player__resizer i {
    font-size: 0.65rem;
    color: white;
    opacity: 0.8;
}

.learn-mini-player__resizer:hover {
    background: linear-gradient(135deg, transparent 50%, #10b981 50%);
}

.learn-mini-player.resizing {
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.2);
    opacity: 0.9;
}

/* ─── MAGNIFY MODAL ─── */
.learn-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(12px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 20px;
}
.learn-modal.active {
    opacity: 1;
    pointer-events: auto;
}

.learn-modal__close {
    position: absolute;
    top: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.2s;
}
.learn-modal__close:hover {
    background: #f43f5e;
    border-color: #f43f5e;
}

.learn-modal__content {
    max-width: 90%;
    max-height: 90%;
    transform: scale(0.9);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.2);
}
.learn-modal.active .learn-modal__content {
    transform: scale(1);
}
.learn-modal__content img {
    max-width: 100%;
    max-height: 90vh;
    border-radius: 12px;
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5);
    object-fit: contain;
    background: white; /* Ensures diagrams with transparent/white backgrounds stay legible */
}

/* ─── VIDEO PLAYER ─── */
.learn-video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    height: 0;
    margin-bottom: 24px;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 12px 40px rgba(0,0,0,0.1);
    border: 1px solid var(--border-glass);
    background: var(--bg-surface);
}

.learn-video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* ─── ACTION BUTTONS ─── */
.learn-lesson__actions {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
}
.learn-action-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 12px;
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}
.learn-action-btn:hover {
    background: var(--bg-dark);
    border-color: var(--accent-purple);
    color: var(--accent-purple);
    transform: translateY(-2px);
}
.learn-action-btn i {
    font-size: 1.1rem;
    color: var(--accent-purple);
}

/* ─── TABLES ─── */
.learn-table-container {
    width: 100%;
    margin: 24px 0;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-glass);
    background: var(--bg-surface);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
}

.learn-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    text-align: left;
}

.learn-table thead {
    background: rgba(16, 185, 129, 0.08);
}

.learn-table th {
    padding: 16px 20px;
    font-weight: 700;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-glass);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
}

.learn-table td {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-glass);
    color: var(--text-secondary);
    line-height: 1.6;
    vertical-align: top;
}

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

.learn-table tr:hover {
    background: rgba(16, 185, 129, 0.02);
}

[data-theme="dark"] .learn-table tr:hover {
    background: rgba(16, 185, 129, 0.05);
}

/* ─── FADE-IN ANIMATIONS (Continued) ─── */

.learn-formula {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 24px 0;
    padding: 24px;
    background: rgba(16, 185, 129, 0.05);
    border-radius: 16px;
    color: var(--text-primary);
    border: 1px solid rgba(16, 185, 129, 0.15);
    font-family: var(--font-serif, serif);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}
[data-theme="dark"] .learn-formula {
    background: rgba(16, 185, 129, 0.08);
    border-color: rgba(16, 185, 129, 0.25);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
}
/* ─── QUESTION BANK ─── */
.learn-qbank {
    max-width: 1000px;
    margin: 0 auto;
}
.learn-qbank__hero {
    margin-bottom: 40px;
}
.learn-qbank__title {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--text-primary);
}
.learn-qbank__desc {
    color: var(--text-muted);
}
.learn-qbank__badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.learn-qbank__search {
    position: relative;
    margin-bottom: 24px;
}
.learn-qbank__search i {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
    color: var(--text-muted);
}
.learn-qbank__search input {
    width: 100%;
    padding: 16px 16px 16px 52px;
    border-radius: 16px;
    border: 1px solid var(--border-glass);
    background: var(--bg-surface);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.2s;
    box-shadow: 0 2px 8px rgba(0,0,0,0.02);
}
.learn-qbank__search input:focus {
    outline: none;
    border-color: #10b981;
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.1);
}

.learn-qbank__filters {
    display: flex;
    gap: 10px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}
.learn-qbank__filter {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}
.learn-qbank__filter:hover {
    border-color: #10b981;
    color: #10b981;
}
.learn-qbank__filter.active {
    background: #10b981;
    color: white;
    border-color: #10b981;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
}

.learn-qbank__cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(450px, 1fr));
    gap: 20px;
}
@media (max-width: 600px) {
    .learn-qbank__cards { grid-template-columns: 1fr; }
}

.learn-qbank__card {
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    border-radius: 18px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}
.learn-qbank__card:hover {
    transform: translateY(-4px);
    border-color: #10b981;
    box-shadow: 0 12px 32px rgba(0,0,0,0.06);
}
.learn-qbank__card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.learn-qbank__card-topic {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #10b981;
    background: rgba(16, 185, 129, 0.1);
    padding: 4px 10px;
    border-radius: 6px;
}
.learn-qbank__card-difficulty {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
}
.learn-qbank__card-question {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.5;
    flex: 1;
}
.learn-qbank__card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 8px;
}
.learn-qbank__card-meta {
    font-size: 0.78rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 12px;
}
.learn-qbank__card-btn {
    padding: 8px 16px;
    background: #10b981;
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}
.learn-qbank__card-btn:hover {
    background: #059669;
    transform: scale(1.05);
}

/* ─── QUICK VIEW MODAL ─── */
.qmodal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(8px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s;
    padding: 20px;
}
.qmodal.active {
    opacity: 1;
    pointer-events: auto;
}
.qmodal__content {
    background: var(--bg-surface);
    width: 100%;
    max-width: 600px;
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 40px 100px rgba(0,0,0,0.3);
    transform: translateY(20px);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.2);
    position: relative;
}
.qmodal.active .qmodal__content {
    transform: translateY(0);
}
.qmodal__close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-dark);
    border: 1px solid var(--border-glass);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-secondary);
}
.qmodal__close:hover {
    background: #f43f5e;
    color: white;
    border-color: #f43f5e;
}

.qmodal__header { margin-bottom: 24px; }
.qmodal__tag {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    color: #10b981;
    margin-bottom: 8px;
}
.qmodal__question {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.4;
}

.qmodal__options {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 32px;
}
.qmodal__option {
    padding: 16px 20px;
    border-radius: 12px;
    border: 2px solid var(--border-glass);
    background: var(--bg-surface);
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 12px;
}
.qmodal__option:hover {
    border-color: #10b981;
    background: rgba(16, 185, 129, 0.05);
}
.qmodal__option.selected {
    border-color: #10b981;
    background: rgba(16, 185, 129, 0.1);
}
.qmodal__option.correct {
    background: #10b981 !important;
    border-color: #10b981 !important;
    color: white !important;
}
.qmodal__option.wrong {
    background: #f43f5e !important;
    border-color: #f43f5e !important;
    color: white !important;
}

.qmodal__footer {
    display: flex;
    justify-content: flex-end;
}
.qmodal__check-btn {
    padding: 14px 32px;
    background: #10b981;
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
}
.qmodal__check-btn:hover { background: #059669; }
.qmodal__check-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.qmodal__explanation {
    margin-top: 24px;
    padding: 20px;
    border-radius: 16px;
    background: var(--bg-dark);
    display: none;
}
.qmodal__explanation.active { display: block; animation: fadeIn 0.4s; }
.qmodal__explanation-title {
    font-weight: 800;
    font-size: 0.8rem;
    text-transform: uppercase;
    margin-bottom: 8px;
    color: var(--text-muted);
}
.qmodal__explanation-text {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

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

/* Animations from Academy */
.learn-animate { opacity: 0; animation: learnSlideUp 0.6s cubic-bezier(0.22, 1, 0.36, 1) forwards; }
.learn-animate--delay-1 { animation-delay: 0.1s; }
.learn-animate--delay-2 { animation-delay: 0.2s; }
.learn-animate--delay-3 { animation-delay: 0.3s; }
.learn-animate--delay-4 { animation-delay: 0.4s; }

@keyframes learnSlideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
/* ─── CATEGORY SELECTOR ─── */
.qbank-selector {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 20px;
}
@media (max-width: 768px) {
    .qbank-selector { grid-template-columns: 1fr; }
}

.qbank-choice {
    position: relative;
    padding: 40px;
    border-radius: 24px;
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    text-decoration: none;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    min-height: 280px;
}
.qbank-choice:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    border-color: transparent;
}
.qbank-choice--human {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}
.qbank-choice--physical {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    opacity: 0.7;
    cursor: not-allowed;
}
.qbank-choice__content {
    position: relative;
    z-index: 2;
    color: white;
}
.qbank-choice__icon {
    width: 64px;
    height: 64px;
    background: rgba(255,255,255,0.2);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 24px;
    backdrop-filter: blur(8px);
}
.qbank-choice__title {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 8px;
    font-family: var(--font-heading);
}
.qbank-choice__count {
    font-size: 0.9rem;
    opacity: 0.8;
    font-weight: 600;
}
.qbank-choice__badge {
    position: absolute;
    top: 24px;
    right: 24px;
    background: rgba(0,0,0,0.2);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
}
.qbank-choice__open {
    margin-top: auto;
    width: fit-content;
    padding: 10px 24px;
    background: white;
    color: #059669;
    border-radius: 12px;
    font-weight: 700;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
}
.qbank-choice--human .qbank-choice__open { color: #059669; }
.qbank-choice--physical .qbank-choice__open { color: #2563eb; }

/* ─── TOPIC LIST VIEW ─── */
.qbank-topics {
    display: flex;
    flex-direction: column;
    gap: 32px;
}
.qbank-unit-section {
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    border-radius: 20px;
    overflow: hidden;
}
.qbank-unit-header {
    padding: 24px 28px;
    border-bottom: 1px solid var(--border-glass);
    background: rgba(16, 185, 129, 0.03);
}
.qbank-unit-title {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-primary);
}
.qbank-topics-list {
    padding: 0;
}
.qbank-topic-item {
    display: flex;
    align-items: center;
    padding: 20px 28px;
    border-bottom: 1px solid var(--border-glass);
    transition: background 0.2s;
    cursor: pointer;
    text-decoration: none;
}
.qbank-topic-item:last-child { border-bottom: none; }
.qbank-topic-item:hover {
    background: rgba(16, 185, 129, 0.02);
}
.qbank-topic-info {
    flex: 1;
}
.qbank-topic-name {
    display: block;
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 4px;
}
.qbank-topic-progress-container {
    display: flex;
    align-items: center;
    gap: 16px;
    width: 240px;
}
.qbank-topic-progress-bar {
    flex: 1;
    height: 8px;
    background: var(--bg-dark);
    border-radius: 4px;
    overflow: hidden;
}
.qbank-topic-progress-fill {
    height: 100%;
    background: #10b981;
    border-radius: 4px;
}
.qbank-topic-stats {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-muted);
    min-width: 60px;
}
.qbank-topic-accuracy {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: 700;
    color: #10b981;
    min-width: 80px;
    justify-content: flex-end;
}
.qbank-topic-accuracy::before {
    content: '';
    width: 8px;
    height: 8px;
    background: currentColor;
    border-radius: 50%;
}

.qbank-back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 10px;
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    margin-bottom: 24px;
    transition: all 0.2s;
}
.qbank-back-btn:hover {
    border-color: #10b981;
    color: #10b981;
}

/* ─── FILTRATION SYSTEM (difficulty/type) ─── */
.qbank-advanced-filters {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    padding: 16px;
    background: rgba(16, 185, 129, 0.05);
    border-radius: 16px;
    border: 1px solid rgba(16, 185, 129, 0.1);
}
.qbank-select-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
}
.qbank-select-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
}
.qbank-select {
    padding: 10px 14px;
    border-radius: 10px;
    border: 1px solid var(--border-glass);
    background: var(--bg-surface);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
}
.qbank-select:focus { outline: none; border-color: #10b981; }

.qbank-summary-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 32px;
}
.qbank-stat-card {
    padding: 20px;
    border-radius: 18px;
    background: var(--bg-surface);
    border: 1px solid var(--border-glass);
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.qbank-stat-val { font-size: 1.5rem; font-weight: 800; color: #10b981; }
.qbank-stat-label { font-size: 0.8rem; font-weight: 600; color: var(--text-muted); }