/* ==================== Tutorial Main ==================== */
.tutorial-main {
    min-height: calc(100vh - 80px);
    padding: 2rem 0 4rem;
    background: var(--bg-secondary);
}

/* ==================== Breadcrumb ==================== */
.tutorial-breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.tutorial-breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
}

.tutorial-breadcrumb a:hover {
    text-decoration: underline;
}

/* ==================== Tutorial Layout ==================== */
.tutorial-layout {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 2rem;
    align-items: start;
}

/* ==================== Tutorial Sidebar ==================== */
.tutorial-sidebar {
    position: sticky;
    top: 100px;
}

.tutorial-info {
    background: white;
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    text-align: center;
    margin-bottom: 1.5rem;
}

.tutorial-icon-large {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.tutorial-info h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.tutorial-stats {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.tutorial-stats .stat {
    padding: 0.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.tutorial-nav {
    background: white;
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    margin-bottom: 1.5rem;
}

.tutorial-nav h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.tutorial-nav ul {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.tutorial-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.tutorial-nav a:hover {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

.tutorial-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

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

/* ==================== Tutorial Content ==================== */
.tutorial-content {
    background: white;
    border-radius: var(--radius-lg);
    padding: 3rem;
    box-shadow: var(--shadow-md);
}

.tutorial-content h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    line-height: 1.3;
}

.tutorial-content h2 {
    font-size: 2rem;
    margin: 3rem 0 1.5rem;
    color: var(--text-primary);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.tutorial-content h3 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
    color: var(--text-primary);
}

.tutorial-content h4 {
    font-size: 1.25rem;
    margin: 1.5rem 0 0.75rem;
    color: var(--text-primary);
}

.tutorial-content p {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.tutorial-content .lead {
    font-size: 1.25rem;
    color: var(--text-primary);
    font-weight: 500;
}

.tutorial-content ul,
.tutorial-content ol {
    margin: 1rem 0 1.5rem 2rem;
}

.tutorial-content li {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.content-section {
    margin-bottom: 3rem;
}

/* ==================== Info Boxes ==================== */
.info-box,
.example-box {
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
}

.info-box {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(99, 102, 241, 0.05));
    border-left: 4px solid var(--primary-color);
}

.example-box {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(16, 185, 129, 0.05));
    border-left: 4px solid var(--success-color);
}

.info-box h4,
.example-box h4 {
    margin-top: 0;
    margin-bottom: 1rem;
}

.info-box p,
.example-box p {
    margin-bottom: 0.5rem;
}

.info-box ul,
.example-box ul {
    margin-bottom: 0;
}

/* ==================== Polygon Grid ==================== */
.polygon-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.polygon-card {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.polygon-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.polygon-card h3 {
    font-size: 1.25rem;
    margin: 0 0 1rem 0;
    color: var(--primary-color);
}

.polygon-card p {
    font-size: 1rem;
    margin-bottom: 1rem;
}

.formula {
    padding: 0.75rem;
    background: white;
    border-radius: var(--radius-sm);
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
}

/* ==================== Formula Boxes ==================== */
.formula-box {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    padding: 2rem;
    border-radius: var(--radius-md);
    text-align: center;
    margin: 2rem 0;
}

.formula-box h4 {
    margin: 0 0 1rem 0;
    color: white;
}

.formula-large {
    font-size: 2rem;
    font-weight: 700;
    margin: 1rem 0;
}

.formula-box p {
    margin: 0;
    color: rgba(255, 255, 255, 0.9);
}

/* ==================== Comparison Box ==================== */
.comparison-box {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.comparison-item {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.comparison-item h4 {
    margin-top: 0;
    color: var(--primary-color);
}

.comparison-item ul {
    margin: 1rem 0 0 1.5rem;
}

/* ==================== Application Grid ==================== */
.application-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.application-card {
    text-align: center;
    padding: 2rem 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.application-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.app-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.application-card h4 {
    margin: 0 0 0.75rem 0;
    color: var(--text-primary);
}

.application-card p {
    font-size: 0.95rem;
    margin: 0;
}

/* ==================== Exercise Boxes ==================== */
.exercise-box {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
}

.exercise-box h4 {
    margin: 0 0 1rem 0;
    color: var(--primary-color);
}

.exercise-box p {
    margin-bottom: 1rem;
}

.btn-reveal {
    padding: 0.5rem 1.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.btn-reveal:hover {
    background: var(--primary-dark);
}

.answer {
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(16, 185, 129, 0.1);
    border-left: 4px solid var(--success-color);
    border-radius: var(--radius-sm);
}

.answer strong {
    color: var(--success-color);
}

/* ==================== Completion Box ==================== */
.completion-box {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(16, 185, 129, 0.05));
    border: 2px solid var(--success-color);
    border-radius: var(--radius-md);
    padding: 2rem;
    text-align: center;
}

.completion-box h3 {
    margin: 0 0 1rem 0;
    color: var(--success-color);
}

.completion-box ul {
    text-align: left;
    max-width: 500px;
    margin: 1.5rem auto;
}

.completion-box .btn {
    margin-top: 1rem;
}

/* ==================== Tutorial Navigation ==================== */
.tutorial-navigation {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
}

.tutorial-navigation .nav-link {
    flex: 1;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: var(--transition);
}

.tutorial-navigation .nav-link:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.tutorial-navigation .nav-link.next {
    text-align: right;
}

.nav-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.nav-title {
    display: block;
    font-weight: 600;
    color: var(--primary-color);
}

/* ==================== Responsive ==================== */
@media (max-width: 1024px) {
    .tutorial-layout {
        grid-template-columns: 1fr;
    }

    .tutorial-sidebar {
        position: static;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {
    .tutorial-content {
        padding: 2rem 1.5rem;
    }

    .tutorial-content h1 {
        font-size: 2rem;
    }

    .tutorial-content h2 {
        font-size: 1.5rem;
    }

    .tutorial-content p,
    .tutorial-content li {
        font-size: 1rem;
    }

    .polygon-grid,
    .application-grid {
        grid-template-columns: 1fr;
    }

    .comparison-box {
        grid-template-columns: 1fr;
    }
}

/* ==================== Roman Numerals Specific Styles ==================== */
.symbols-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.symbol-card {
    text-align: center;
    padding: 2rem 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.symbol-card:hover {
    transform: translateY(-8px) scale(1.05);
    box-shadow: var(--shadow-xl);
}

.symbol-large {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    font-family: 'Times New Roman', serif;
}

.symbol-value {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.symbol-card p {
    font-size: 0.875rem;
    margin: 0;
    opacity: 0.9;
}

.rule-box {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
}

.rule-box p {
    margin-bottom: 1.5rem;
}

.examples-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.example-item {
    background: white;
    padding: 1.5rem;
    border-radius: var(--radius-sm);
    text-align: center;
}

.example-item .roman {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    font-family: 'Times New Roman', serif;
}

.example-item .calculation {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.example-item .result {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--success-color);
}

.numbers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.number-card {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-md);
}

.number-card .arabic {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.number-card .roman-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.number-card .roman-list span {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-family: 'Times New Roman', serif;
}

.complex-examples {
    display: grid;
    gap: 1.5rem;
    margin: 2rem 0;
}

.complex-example {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(236, 72, 153, 0.1));
    padding: 2rem;
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
}

.complex-example .number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.complex-example .breakdown {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.complex-example .step {
    padding: 0.5rem 1rem;
    background: white;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.complex-example .roman-result {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    font-family: 'Times New Roman', serif;
}

.method-box {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
}

.method-box h4 {
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.method-box ol {
    margin: 0;
    padding-left: 1.5rem;
}

.method-box li {
    margin-bottom: 0.75rem;
}

.conversion-steps {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.conversion-steps .step {
    padding: 1rem;
    background: white;
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--primary-color);
}

.usage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.usage-card {
    text-align: center;
    padding: 2rem 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.usage-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.usage-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.usage-card h4 {
    margin: 0 0 0.75rem 0;
    color: var(--text-primary);
}

.usage-card p {
    font-size: 0.95rem;
    margin: 0;
}

.tutorial-navigation .nav-link.prev {
    text-align: left;
}

/* ==================== Responsive for Roman Numerals ==================== */
@media (max-width: 768px) {
    .symbols-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: 1rem;
    }

    .symbol-card {
        padding: 1.5rem 0.75rem;
    }

    .symbol-large {
        font-size: 2rem;
    }

    .symbol-value {
        font-size: 1.25rem;
    }

    .examples-row {
        grid-template-columns: 1fr;
    }

    .complex-example .number {
        font-size: 1.5rem;
    }

    .complex-example .roman-result {
        font-size: 1.75rem;
    }

    .numbers-grid,
    .usage-grid {
        grid-template-columns: 1fr;
    }
}

/* ==================== Pi Tutorial Specific Styles ==================== */
.pi-definition-box {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 2rem;
    align-items: center;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(236, 72, 153, 0.1));
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
}

.pi-symbol {
    font-size: 6rem;
    font-weight: 700;
    color: var(--primary-color);
    font-family: 'Times New Roman', serif;
}

.pi-formula {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.formula-text {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.circle-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.circle {
    position: relative;
    width: 150px;
    height: 150px;
    border: 4px solid var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.diameter-line {
    position: absolute;
    width: 100%;
    height: 2px;
    background: var(--primary-dark);
}

.diameter-label {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-dark);
    z-index: 1;
}

.circumference-label {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
}

.pi-digits-box {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
}

.pi-digits-box h3 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.pi-digits {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    font-family: 'Courier New', monospace;
    font-size: 1.25rem;
}

.digit-group {
    padding: 0.5rem 0.75rem;
    background: white;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-weight: 600;
}

.digit-group.highlight {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    font-size: 1.5rem;
    padding: 0.75rem 1rem;
}

.approximations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.approx-card {
    text-align: center;
    padding: 2rem 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.approx-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.approx-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    font-family: 'Courier New', monospace;
}

.approx-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.approx-use {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.formulas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.formula-card {
    text-align: center;
    padding: 2rem 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.formula-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(236, 72, 153, 0.1));
}

.formula-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.formula-card h4 {
    margin: 0 0 1rem 0;
    color: var(--text-primary);
}

.formula-display {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 1rem 0;
    font-family: 'Times New Roman', serif;
}

.formula-alt {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.formula-card p {
    font-size: 0.875rem;
    margin: 0;
    color: var(--text-secondary);
}

.worked-examples {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin: 2rem 0;
}

.example-problem {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-md);
}

.example-problem h4 {
    margin: 0 0 1.5rem 0;
    color: var(--primary-color);
}

.solution-steps {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.solution-steps .step {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 1rem;
    padding: 1rem;
    background: white;
    border-radius: var(--radius-sm);
    align-items: center;
}

.step-label {
    font-weight: 700;
    color: var(--primary-color);
}

.step-content {
    font-family: 'Courier New', monospace;
    color: var(--text-primary);
}

.timeline {
    position: relative;
    padding: 2rem 0;
    margin: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
    transform: translateX(-50%);
}

.timeline-item {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
    align-items: center;
}

.timeline-item:nth-child(odd) .timeline-date {
    text-align: right;
}

.timeline-item:nth-child(even) .timeline-date {
    order: 3;
    text-align: left;
}

.timeline-item:nth-child(even) .timeline-content {
    order: 1;
    text-align: right;
}

.timeline-date {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.timeline-content {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    position: relative;
}

.timeline-content h4 {
    margin: 0 0 0.5rem 0;
    color: var(--text-primary);
}

.timeline-content p {
    margin: 0;
    font-size: 0.95rem;
}

.timeline-item::after {
    content: '';
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border: 4px solid white;
    border-radius: 50%;
    box-shadow: 0 0 0 2px var(--primary-color);
    order: 2;
}

.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.app-card {
    text-align: center;
    padding: 2rem 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.app-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.app-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.app-card h4 {
    margin: 0 0 0.75rem 0;
    color: var(--text-primary);
}

.app-card p {
    font-size: 0.95rem;
    margin: 0;
}

/* ==================== Responsive for Pi Tutorial ==================== */
@media (max-width: 768px) {
    .pi-definition-box {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .pi-symbol {
        font-size: 4rem;
    }

    .formula-text {
        font-size: 1.25rem;
    }

    .circle {
        width: 120px;
        height: 120px;
    }

    .pi-digits {
        font-size: 1rem;
    }

    .digit-group.highlight {
        font-size: 1.25rem;
    }

    .approximations-grid,
    .formulas-grid,
    .applications-grid {
        grid-template-columns: 1fr;
    }

    .solution-steps .step {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        grid-template-columns: auto 1fr;
        gap: 1rem;
    }

    .timeline-item::after {
        order: 1;
    }

    .timeline-date {
        display: none;
    }

    .timeline-item:nth-child(even) .timeline-content {
        order: 2;
        text-align: left;
    }

    .timeline-content::before {
        content: attr(data-date);
        display: block;
        font-size: 1rem;
        font-weight: 700;
        color: var(--primary-color);
        margin-bottom: 0.5rem;
    }
}

/* ==================== PEMDAS Tutorial Specific Styles ==================== */
.pemdas-box {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(236, 72, 153, 0.1));
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
}

.pemdas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1.5rem;
}

.pemdas-card {
    text-align: center;
    padding: 2rem 1rem;
    background: white;
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.pemdas-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.pemdas-letter {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.pemdas-word {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.pemdas-example {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.rule-box {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
}

.rule-example {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.rule-example .expression {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
}

.rule-example .step-arrow {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.rule-example .result {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--success-color);
    font-family: 'Courier New', monospace;
}

.worked-examples {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin: 2rem 0;
}

.example-problem {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-md);
}

.example-problem h4 {
    margin: 0 0 1rem 0;
    color: var(--primary-color);
}

.problem-statement {
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    padding: 1.5rem;
    background: white;
    border-radius: var(--radius-sm);
    margin-bottom: 1.5rem;
    font-family: 'Courier New', monospace;
    color: var(--text-primary);
}

.warning-note {
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(239, 68, 68, 0.1);
    border-left: 4px solid #ef4444;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    color: #dc2626;
}

.mistake-box {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
}

.mistake-box h4 {
    margin: 0 0 1rem 0;
    color: #ef4444;
}

.mistake-example {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 1rem 0;
}

.mistake-example .wrong,
.mistake-example .correct {
    padding: 1rem;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mistake-example .wrong {
    background: rgba(239, 68, 68, 0.1);
    border-left: 4px solid #ef4444;
}

.mistake-example .correct {
    background: rgba(16, 185, 129, 0.1);
    border-left: 4px solid var(--success-color);
}

.mistake-example .label {
    font-weight: 700;
    min-width: 80px;
}

.mistake-example .wrong .label {
    color: #dc2626;
}

.mistake-example .correct .label {
    color: var(--success-color);
}

.mistake-example .calc {
    font-family: 'Courier New', monospace;
    font-size: 1.125rem;
}

.mistake-box .explanation {
    margin: 1rem 0 0 0;
    font-style: italic;
    color: var(--text-secondary);
}

.special-case-box {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
}

.special-case-box .example-box {
    margin-top: 1rem;
}

/* ==================== Responsive for PEMDAS Tutorial ==================== */
@media (max-width: 768px) {
    .pemdas-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: 1rem;
    }

    .pemdas-card {
        padding: 1.5rem 0.75rem;
    }

    .pemdas-letter {
        font-size: 2rem;
    }

    .pemdas-word {
        font-size: 0.95rem;
    }

    .pemdas-example {
        font-size: 1.25rem;
    }

    .rule-example {
        flex-direction: column;
        gap: 0.5rem;
    }

    .problem-statement {
        font-size: 1.25rem;
        padding: 1rem;
    }

    .mistake-example .wrong,
    .mistake-example .correct {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .mistake-example .label {
        min-width: auto;
    }

    .mistake-example .calc {
        font-size: 1rem;
    }
}

/* ==================== Golden Ratio Tutorial Specific Styles ==================== */
.golden-ratio-box {
    background: linear-gradient(135deg, rgba(250, 204, 21, 0.2), rgba(251, 146, 60, 0.2));
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
    border: 2px solid rgba(250, 204, 21, 0.3);
}

.phi-symbol {
    font-size: 6rem;
    font-weight: 700;
    color: #f59e0b;
    font-family: 'Times New Roman', serif;
}

.golden-rectangle-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin: 2rem 0;
}

.rectangle-demo {
    position: relative;
    width: 300px;
    height: 185px;
    border: 3px solid #f59e0b;
    background: linear-gradient(135deg, rgba(250, 204, 21, 0.1), rgba(251, 146, 60, 0.1));
}

.square-overlay {
    position: absolute;
    left: 0;
    top: 0;
    width: 185px;
    height: 185px;
    border-right: 2px dashed #f59e0b;
    background: rgba(250, 204, 21, 0.1);
}

.fibonacci-visual {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 0.5rem;
    margin: 2rem 0;
}

.fib-number {
    text-align: center;
    padding: 1rem;
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: white;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 1.25rem;
}

.ratio-comparison {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}

.ratio-card {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    text-align: center;
    transition: var(--transition);
}

.ratio-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    background: linear-gradient(135deg, rgba(250, 204, 21, 0.1), rgba(251, 146, 60, 0.1));
}

.ratio-value {
    font-size: 2rem;
    font-weight: 700;
    color: #f59e0b;
    margin-bottom: 0.5rem;
    font-family: 'Courier New', monospace;
}

.ratio-label {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.nature-examples {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.nature-card {
    padding: 2rem 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    text-align: center;
    transition: var(--transition);
    border-top: 4px solid #f59e0b;
}

.nature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.nature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.spiral-description {
    background: linear-gradient(135deg, rgba(250, 204, 21, 0.1), rgba(251, 146, 60, 0.1));
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
    border-left: 4px solid #f59e0b;
}

.golden-angle-box {
    display: flex;
    align-items: center;
    justify-content: space-around;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin: 2rem 0;
}

.angle-value {
    font-size: 3rem;
    font-weight: 700;
    color: #f59e0b;
}

.angle-description {
    max-width: 400px;
}

/* ==================== Responsive for Golden Ratio Tutorial ==================== */
@media (max-width: 768px) {
    .phi-symbol {
        font-size: 4rem;
    }

    .rectangle-demo {
        width: 200px;
        height: 124px;
    }

    .square-overlay {
        width: 124px;
        height: 124px;
    }

    .fibonacci-visual {
        grid-template-columns: repeat(auto-fit, minmax(60px, 1fr));
    }

    .fib-number {
        padding: 0.75rem;
        font-size: 1rem;
    }

    .ratio-comparison {
        grid-template-columns: 1fr;
    }

    .nature-examples {
        grid-template-columns: 1fr;
    }

    .golden-angle-box {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .angle-description {
        max-width: 100%;
    }
}

/* ==================== Pythagorean Theorem Tutorial Specific Styles ==================== */
.pythagorean-formula-box {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(147, 51, 234, 0.1));
    padding: 3rem 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
    text-align: center;
    border: 2px solid rgba(59, 130, 246, 0.3);
}

.pythagorean-formula-box .formula-display {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 1rem 0;
    font-family: 'Times New Roman', serif;
}

.triangle-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 3rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin: 2rem 0;
}

.right-triangle {
    position: relative;
    width: 0;
    height: 0;
    border-left: 150px solid transparent;
    border-bottom: 200px solid rgba(59, 130, 246, 0.2);
    border-right: 0;
}

.triangle-labels {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin: 2rem 0;
}

.triangle-label-card {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    text-align: center;
    border-top: 4px solid var(--primary-color);
}

.label-letter {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.label-name {
    font-size: 1.125rem;
    font-

/* ==================== Pythagorean Theorem Tutorial Specific Styles ==================== */
.pythagorean-box {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(147, 51, 234, 0.1));
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
    border: 2px solid rgba(59, 130, 246, 0.3);
}

.theorem-formula {
    text-align: center;
    padding: 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    border-radius: var(--radius-md);
    margin: 2rem 0;
}

.theorem-formula .formula-large {
    font-size: 3rem;
    font-weight: 700;
    margin: 1rem 0;
    font-family: 'Times New Roman', serif;
}

.triangle-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin: 2rem 0;
}

.right-triangle {
    position: relative;
    width: 0;
    height: 0;
    border-left: 150px solid transparent;
    border-bottom: 200px solid rgba(59, 130, 246, 0.3);
}

.triangle-labels {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 1rem;
    text-align: center;
}

.triangle-label {
    padding: 1rem;
    background: white;
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--primary-color);
}

.label-letter {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.label-name {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.proof-box {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
    border-left: 4px solid var(--primary-color);
}

.proof-box h4 {
    margin: 0 0 1rem 0;
    color: var(--primary-color);
}

.proof-steps {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.proof-step {
    padding: 1rem;
    background: white;
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--success-color);
}

.proof-step .step-number {
    display: inline-block;
    width: 30px;
    height: 30px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    text-align: center;
    line-height: 30px;
    font-weight: 700;
    margin-right: 1rem;
}

.triples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}

.triple-card {
    text-align: center;
    padding: 1.5rem 1rem;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(147, 51, 234, 0.1));
    border-radius: var(--radius-md);
    transition: var(--transition);
    border: 2px solid transparent;
}

.triple-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.triple-numbers {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-family: 'Courier New', monospace;
}

.triple-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.triple-verification {
    font-size: 0.75rem;
    color: var(--success-color);
    margin-top: 0.5rem;
}

.distance-formula-box {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(5, 150, 105, 0.1));
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
    border-left: 4px solid var(--success-color);
}

.distance-formula-box .formula-display {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--success-color);
    text-align: center;
    margin: 1rem 0;
    font-family: 'Times New Roman', serif;
}

.application-examples {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.app-example-card {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.app-example-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.app-example-card .app-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.app-example-card h4 {
    margin: 0 0 0.75rem 0;
    color: var(--text-primary);
}

.app-example-card p {
    font-size: 0.95rem;
    margin: 0;
}

.converse-box {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(217, 119, 6, 0.1));
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
    border: 2px solid rgba(245, 158, 11, 0.3);
}

.converse-box h4 {
    color: #f59e0b;
    margin: 0 0 1rem 0;
}

.triangle-types {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.triangle-type-card {
    padding: 1.5rem;
    background: white;
    border-radius: var(--radius-md);
    text-align: center;
}

.triangle-type-card.right {
    border-top: 4px solid var(--success-color);
}

.triangle-type-card.acute {
    border-top: 4px solid var(--primary-color);
}

.triangle-type-card.obtuse {
    border-top: 4px solid #ef4444;
}

.triangle-type-card h5 {
    margin: 0 0 0.75rem 0;
}

.triangle-type-card .condition {
    font-family: 'Courier New', monospace;
    font-weight: 700;
    margin: 0.5rem 0;
}

.historical-note {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.1), rgba(139, 92, 246, 0.1));
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
    border-left: 4px solid #a855f7;
}

.historical-note h4 {
    color: #a855f7;
    margin: 0 0 1rem 0;
}

/* ==================== Responsive for Pythagorean Tutorial ==================== */
@media (max-width: 768px) {
    .theorem-formula .formula-large {
        font-size: 2rem;
    }

    .right-triangle {
        border-left: 100px solid transparent;
        border-bottom: 133px solid rgba(59, 130, 246, 0.3);
    }

    .triangle-labels {
        grid-template-columns: 1fr;
    }

    .triples-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }

    .triple-numbers {
        font-size: 1.25rem;
    }

    .application-examples {
        grid-template-columns: 1fr;
    }

    .triangle-types {
        grid-template-columns: 1fr;
    }

    .distance-formula-box .formula-display {
        font-size: 1.125rem;
    }
}

/* ==================== Imaginary Numbers Tutorial Specific Styles ==================== */
.imaginary-box {
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.1), rgba(219, 39, 119, 0.1));
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
    border: 2px solid rgba(236, 72, 153, 0.3);
}

.i-symbol {
    font-size: 6rem;
    font-weight: 700;
    color: #ec4899;
    font-family: 'Times New Roman', serif;
    font-style: italic;
}

.complex-number-box {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin: 2rem 0;
}

.complex-form {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    font-family: 'Times New Roman', serif;
}

.complex-form .real-part {
    color: #3b82f6;
}

.complex-form .imaginary-part {
    color: #ec4899;
}

.complex-parts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.part-card {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    text-align: center;
    transition: var(--transition);
}

.part-card.real {
    border-top: 4px solid #3b82f6;
}

.part-card.imaginary {
    border-top: 4px solid #ec4899;
}

.part-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.part-label {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.part-card.real .part-label {
    color: #3b82f6;
}

.part-card.imaginary .part-label {
    color: #ec4899;
}

.part-example {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: 'Courier New', monospace;
}

.operation-examples {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin: 2rem 0;
}

.operation-card {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-md);
}

.operation-card h4 {
    margin: 0 0 1rem 0;
    color: #ec4899;
}

.operation-example {
    padding: 1.5rem;
    background: white;
    border-radius: var(--radius-sm);
    margin: 1rem 0;
}

.operation-expression {
    font-size: 1.25rem;
    font-weight: 600;
    font-family: 'Courier New', monospace;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.complex-plane-box {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
}

.plane-description {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.axis-card {
    padding: 1.5rem;
    background: white;
    border-radius: var(--radius-md);
    border-left: 4px solid #3b82f6;
}

.axis-card.imaginary-axis {
    border-left-color: #ec4899;
}

.axis-card h5 {
    margin: 0 0 0.75rem 0;
    color: #3b82f6;
}

.axis-card.imaginary-axis h5 {
    color: #ec4899;
}

.powers-of-i-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}

.power-card {
    text-align: center;
    padding: 1.5rem 1rem;
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.1), rgba(219, 39, 119, 0.1));
    border-radius: var(--radius-md);
    transition: var(--transition);
    border: 2px solid transparent;
}

.power-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: #ec4899;
}

.power-expression {
    font-size: 1.5rem;
    font-weight: 700;
    color: #ec4899;
    margin-bottom: 0.5rem;
    font-family: 'Times New Roman', serif;
    font-style: italic;
}

.power-result {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
}

.cycle-note {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(5, 150, 105, 0.1));
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
    border-left: 4px solid var(--success-color);
    text-align: center;
}

.cycle-note .formula-display {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--success-color);
    margin: 0.5rem 0;
}

.euler-formula-box {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(124, 58, 237, 0.2));
    padding: 3rem 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
    text-align: center;
    border: 3px solid rgba(139, 92, 246, 0.4);
}

.euler-formula-box h3 {
    color: #8b5cf6;
    margin: 0 0 1.5rem 0;
}

.euler-equation {
    font-size: 3rem;
    font-weight: 700;
    color: #8b5cf6;
    margin: 2rem 0;
    font-family: 'Times New Roman', serif;
}

.euler-components {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.euler-component {
    padding: 1rem;
    background: white;
    border-radius: var(--radius-md);
}

.component-symbol {
    font-size: 2rem;
    font-weight: 700;
    color: #8b5cf6;
    margin-bottom: 0.5rem;
}

.component-name {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.conjugate-box {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(217, 119, 6, 0.1));
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
    border-left: 4px solid #f59e0b;
}

.conjugate-box h5 {
    color: #f59e0b;
    margin: 0 0 1rem 0;
}

.conjugate-example {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.conjugate-number {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: 'Courier New', monospace;
}

.conjugate-arrow {
    font-size: 1.5rem;
    color: #f59e0b;
}

.modulus-argument-box {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.modulus-card,
.argument-card {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.modulus-card {
    border-top: 4px solid #3b82f6;
}

.argument-card {
    border-top: 4px solid #ec4899;
}

.modulus-card h5,
.argument-card h5 {
    margin: 0 0 1rem 0;
}

.modulus-card h5 {
    color: #3b82f6;
}

.argument-card h5 {
    color: #ec4899;
}

/* ==================== Responsive for Imaginary Numbers Tutorial ==================== */
@media (max-width: 768px) {
    .i-symbol {
        font-size: 4rem;
    }

    .complex-form {
        font-size: 1.75rem;
    }

    .complex-number-box {
        flex-direction: column;
        gap: 1rem;
    }

    .complex-parts-grid {
        grid-template-columns: 1fr;
    }

    .powers-of-i-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }

    .power-expression {
        font-size: 1.25rem;
    }

    .power-result {
        font-size: 1rem;
    }

    .euler-equation {
        font-size: 2rem;
    }

    .euler-components {
        grid-template-columns: repeat(2, 1fr);
    }

    .plane-description {
        grid-template-columns: 1fr;
    }

    .modulus-argument-box {
        grid-template-columns: 1fr;
    }

    .conjugate-example {
        flex-direction: column;
        gap: 0.5rem;
    }
}
/* ==================== Fermat's Last Theorem Tutorial Specific Styles ==================== */
.fermat-theorem-box {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(124, 58, 237, 0.2));
    padding: 3rem 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
    text-align: center;
    border: 3px solid rgba(139, 92, 246, 0.4);
}

.theorem-statement h3 {
    color: #8b5cf6;
    margin: 0 0 1.5rem 0;
    font-size: 1.5rem;
}

.theorem-formula .formula-large {
    font-size: 3rem;
    font-weight: 700;
    color: #8b5cf6;
    margin: 1rem 0;
    font-family: 'Times New Roman', serif;
}

.formula-condition {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-style: italic;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.case-card {
    padding: 2rem 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: var(--transition);
    border-top: 4px solid #8b5cf6;
}

.case-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.case-exponent {
    font-size: 2rem;
    font-weight: 700;
    color: #8b5cf6;
    margin-bottom: 1rem;
    font-family: 'Times New Roman', serif;
}

.case-mathematician {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.case-method {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.case-significance {
    font-size: 0.875rem;
    color: var(--success-color);
    font-weight: 600;
    font-style: italic;
}

.kummer-results {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 1.5rem 0;
}

.result-item {
    padding: 1rem;
    background: white;
    border-radius: var(--radius-sm);
    border-left: 4px solid #f59e0b;
}

.computation-timeline {
    display: flex;
    justify-content: space-around;
    align-items: center;
    margin: 2rem 0;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.comp-milestone {
    text-align: center;
    flex: 1;
}

.comp-year {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.comp-achievement {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.obstacles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.obstacle-card {
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(220, 38, 38, 0.1));
    border-radius: var(--radius-md);
    border-left: 4px solid #ef4444;
}

.obstacle-card h4 {
    color: #dc2626;
    margin: 0 0 1rem 0;
}

.wiles-strategy {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin: 2rem 0;
}

.strategy-step {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #8b5cf6, #7c3aed);
    color: white;
    border-radius: 50%;
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.step-content h4 {
    margin: 0 0 0.75rem 0;
    color: #8b5cf6;
}

.wiles-timeline {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin: 2rem 0;
}

.wiles-event {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 2rem;
    align-items: start;
}

.event-date {
    font-size: 1.125rem;
    font-weight: 700;
    color: #8b5cf6;
    text-align: right;
    padding: 1rem;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(124, 58, 237, 0.1));
    border-radius: var(--radius-md);
}

.event-description {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.event-description h4 {
    margin: 0 0 0.75rem 0;
    color: var(--text-primary);
}

.impact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.impact-card {
    padding: 2rem 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    text-align: center;
    transition: var(--transition);
}

.impact-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.impact-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.impact-card h4 {
    margin: 0 0 0.75rem 0;
    color: var(--text-primary);
}

.cultural-impact {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin: 2rem 0;
}

.culture-item {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--success-color);
}

.culture-item h4 {
    margin: 0 0 0.75rem 0;
    color: var(--success-color);
}

.conjecture-box {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(217, 119, 6, 0.1));
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
    border: 2px solid rgba(245, 158, 11, 0.3);
}

.conjecture-box h4 {
    color: #f59e0b;
    margin: 0 0 1rem 0;
}

.conjecture-statement {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    padding: 1.5rem;
    background: white;
    border-radius: var(--radius-sm);
    margin: 1rem 0;
    font-family: 'Times New Roman', serif;
}

.related-problems {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.problem-card {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border-top: 4px solid var(--primary-color);
}

.problem-card h4 {
    margin: 0 0 0.75rem 0;
    color: var(--primary-color);
}

/* ==================== Responsive for Fermat Tutorial ==================== */
@media (max-width: 768px) {
    .theorem-formula .formula-large {
        font-size: 2rem;
    }

    .cases-grid {
        grid-template-columns: 1fr;
    }

    .case-exponent {
        font-size: 1.5rem;
    }

    .computation-timeline {
        flex-direction: column;
        gap: 1.5rem;
    }

    .obstacles-grid {
        grid-template-columns: 1fr;
    }

    .strategy-step {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .wiles-event {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .event-date {
        text-align: center;
    }

    .impact-grid {
        grid-template-columns: 1fr;
    }

    .related-problems {
        grid-template-columns: 1fr;
    }

    .conjecture-statement {
        font-size: 1rem;
    }
}
/* ==================== Calculus Tutorial Specific Styles ==================== */
.calculus-definition-box {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(5, 150, 105, 0.2));
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
    text-align: center;
    border: 3px solid rgba(16, 185, 129, 0.4);
}

.limit-notation {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.limit-formula {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--success-color);
    font-family: 'Times New Roman', serif;
}

.limit-meaning {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-style: italic;
}

.limit-examples {
    margin: 2rem 0;
}

.limit-example {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
}

.limit-example h4 {
    margin: 0 0 1.5rem 0;
    color: var(--success-color);
    text-align: center;
}

.limit-table {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin: 1rem 0;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.table-row {
    display: contents;
}

.table-row.header span {
    font-weight: 700;
    color: var(--text-primary);
    padding: 0.75rem;
    background: white;
    border-radius: var(--radius-sm);
}

.table-row:not(.header) span {
    padding: 0.5rem;
    background: white;
    border-radius: var(--radius-sm);
    text-align: center;
    font-family: 'Courier New', monospace;
}

.table-row.highlight span {
    background: linear-gradient(135deg, var(--success-color), rgba(16, 185, 129, 0.8));
    color: white;
    font-weight: 700;
}

.limit-conclusion {
    text-align: center;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--success-color);
    margin-top: 1.5rem;
    padding: 1rem;
    background: white;
    border-radius: var(--radius-sm);
}

.derivative-definition-box {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(37, 99, 235, 0.2));
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
    text-align: center;
    border: 3px solid rgba(59, 130, 246, 0.4);
}

.derivative-formula .formula-main {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 1rem 0;
    font-family: 'Times New Roman', serif;
}

.formula-meaning {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-style: italic;
}

.geometric-explanation {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
}

.slope-concept h4 {
    margin: 0 0 1rem 0;
    color: var(--primary-color);
}

.slope-progression {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    margin: 1.5rem 0;
}

.slope-step {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: white;
    border-radius: var(--radius-sm);
    min-width: 300px;
}

.step-label {
    font-weight: 600;
    color: var(--text-primary);
    min-width: 120px;
}

.step-formula {
    font-family: 'Times New Roman', serif;
    font-size: 1.125rem;
    color: var(--primary-color);
}

.slope-arrow {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 700;
}

.rules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.rule-card {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: var(--transition);
    border-top: 4px solid var(--primary-color);
}

.rule-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.rule-card h4 {
    margin: 0 0 1rem 0;
    color: var(--primary-color);
}

.rule-formula {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'Times New Roman', serif;
    margin-bottom: 0.75rem;
    padding: 0.75rem;
    background: white;
    border-radius: var(--radius-sm);
}

.rule-example {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-family: 'Courier New', monospace;
}

.common-derivatives {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}

.derivative-pair {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.derivative-pair .function,
.derivative-pair .derivative {
    font-size: 1.125rem;
    font-weight: 600;
    font-family: 'Times New Roman', serif;
}

.derivative-pair .function {
    color: var(--text-primary);
}

.derivative-pair .derivative {
    color: var(--primary-color);
}

.derivative-pair .arrow {
    font-size: 1.5rem;
    color: var(--success-color);
}

.critical-points-box {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(217, 119, 6, 0.1));
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
    border-left: 4px solid #f59e0b;
}

.critical-points-box h4 {
    color: #f59e0b;
    margin: 0 0 1rem 0;
}

.optimization-example,
.related-rates-example {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
}

.optimization-example h4,
.related-rates-example h4 {
    margin: 0 0 1rem 0;
    color: var(--primary-color);
}

.integral-definition-box {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.2), rgba(147, 51, 234, 0.2));
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
    text-align: center;
    border: 3px solid rgba(168, 85, 247, 0.4);
}

.integral-formula .formula-main {
    font-size: 1.75rem;
    font-weight: 700;
    color: #a855f7;
    margin: 1rem 0;
    font-family: 'Times New Roman', serif;
}

.riemann-explanation {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
}

.riemann-steps {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 1.5rem 0;
}

.riemann-step {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: white;
    border-radius: var(--radius-sm);
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    background: #a855f7;
    color: white;
    border-radius: 50%;
    font-weight: 700;
    flex-shrink: 0;
}

.step-description {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.antiderivative-box {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.1), rgba(147, 51, 234, 0.1));
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
    border-left: 4px solid #a855f7;
}

.antiderivative-box h4 {
    color: #a855f7;
    margin: 0 0 1rem 0;
}

.integration-rules {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 2rem 0;
}

.rule-pair {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.rule-name {
    font-weight: 600;
    color: var(--text-primary);
    min-width: 120px;
}

.rule-formula {
    font-family: 'Times New Roman', serif;
    font-size: 1.125rem;
    color: #a855f7;
}

.technique-box {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
}

.technique-box h4 {
    margin: 0 0 1rem 0;
    color: #a855f7;
}

.technique-example {
    margin-top: 1.5rem;
}

.technique-example h5 {
    margin: 0 0 1rem 0;
    color: var(--text-primary);
}

.fundamental-theorem-box {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.2), rgba(220, 38, 38, 0.2));
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
    border: 3px solid rgba(239, 68, 68, 0.4);
}

.fundamental-theorem-box h3 {
    color: #dc2626;
    margin: 0 0 1.5rem 0;
    text-align: center;
}

.theorem-parts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.theorem-part {
    background: white;
    padding: 1.5rem;
    border-radius: var(--radius-md);
}

.theorem-part h4 {
    margin: 0 0 1rem 0;
    color: #dc2626;
}

.theorem-statement {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'Times New Roman', serif;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    margin: 1rem 0;
}

.ftc-example {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
}

.ftc-example h4 {
    margin: 0 0 1.5rem 0;
    color: #dc2626;
}

.area-between-curves {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-md);
    margin: 2rem 0;
}

.area-between-curves h4 {
    margin: 0 0 1rem 0;
    color: #a855f7;
    text-align: center;
    font-family: 'Times New Roman', serif;
    font-size: 1.5rem;
}

.area-example {
    margin-top: 1.5rem;
}

.area-example h5 {
    margin: 0 0 1rem 0;
    color: var(--text-primary);
}

.volume-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.volume-method {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border-top: 4px solid #a855f7;
}

.volume-method h4 {
    margin: 0 0 1rem 0;
    color: #a855f7;
}

.method-formula {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'Times New Roman', serif;
    padding: 1rem;
    background: white;
    border-radius: var(--radius-sm);
    margin: 1rem 0;
    text-align: center;
}

.physics-applications {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin: 2rem 0;
}

.physics-app {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--success-color);
}

.physics-app h4 {
    margin: 0 0 1rem 0;
    color: var(--success-color);
}

.physics-formula {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'Times New Roman', serif;
    padding: 0.75rem;
    background: white;
    border-radius: var(--radius-sm);
    margin: 0.75rem 0;
}

/* ==================== Responsive for Calculus Tutorial ==================== */
@media (max-width: 768px) {
    .limit-formula {
        font-size: 1.75rem;
    }

    .derivative-formula .formula-main {
        font-size: 1.5rem;
    }

    .integral-formula .formula-main {
        font-size: 1.25rem;
    }

    .rules-grid {
        grid-template-columns: 1fr;
    }

    .common-derivatives {
        grid-template-columns: 1fr;
    }

    .slope-step {
        flex-direction: column;
        min-width: auto;
        text-align: center;
    }

    .derivative-pair {
        flex-direction: column;
        gap: 0.5rem;
    }

    .theorem-parts {
        grid-template-columns: 1fr;
    }

    .volume-methods {
        grid-template-columns: 1fr;
    }

    .limit-table {
        max-width: 300px;
    }

    .table-row:not(.header) span {
        font-size: 0.875rem;
    }
}