.education-header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem;
    background-color: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}
.header-logo-container {
    max-width: 400px;
    margin: 0 auto 1.5rem;
}
.education-header h1 {
    font-family: "Lora", serif;
    color: var(--accent-color);
    margin: 0 0 1rem;
}
.education-header .education-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
}
.subject-section {
    margin-bottom: 3rem;
}
.subject-section h2 {
    font-family: "Lora", serif;
    font-size: 2.2rem;
    color: var(--text-primary);
    padding-bottom: 0.75rem;
    border-bottom: 3px solid var(--accent-color);
    margin-bottom: 2rem;
}
.chapters-container {
    display: flex;
    overflow-x: auto;
    gap: 1.5rem;
    padding: 1rem 0.5rem 1.5rem;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-color) var(--border-color);
}
.chapters-container::-webkit-scrollbar {
    height: 8px;
}
.chapters-container::-webkit-scrollbar-track {
    background: var(--border-color);
    border-radius: 10px;
}
.chapters-container::-webkit-scrollbar-thumb {
    background-color: var(--accent-color);
    border-radius: 10px;
    border: 2px solid var(--border-color);
}
.chapter-card-link {
    text-decoration: none;
    color: inherit;
    flex: 0 0 280px;
    scroll-snap-align: start;
}
.chapter-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}
.chapter-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 10px 30px var(--shadow-color);
}
.chapter-svg-container {
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--input-bg);
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}
.chapter-svg-container svg {
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 100%;
}
.chapter-content {
    padding: 1.5rem;
    flex-grow: 1;
}
.chapter-title {
    font-family: "Lora", serif;
    font-size: 1.4rem;
    margin: 0 0 0.75rem;
    color: var(--accent-color);
}
.chapter-description {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin: 0;
}
.formula-page-container {
    background-color: var(--card-bg);
    padding: clamp(1.5rem, 5vw, 2.5rem);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
}
.formula-section {
    margin-bottom: 2.5rem;
}
.formula-category-title {
    font-family: "Lora", serif;
    font-size: 2rem;
    color: var(--text-primary);
    padding-bottom: 0.75rem;
    border-bottom: 3px solid var(--accent-color);
    margin-bottom: 1.5rem;
}
.formula-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}
.formula-item {
    background-color: var(--input-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 5px solid var(--accent-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.formula-item:hover {
    transform: translateY(-4px) scale(1.01);
    box-shadow: 0 6px 15px var(--shadow-color);
}
.formula-header {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
}
.formula-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--accent-color);
    margin: 0;
}
.formula-expression {
    font-family: "Lora", serif;
    font-size: 1.2rem;
    color: var(--text-primary);
    background-color: var(--card-bg);
    padding: 1rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    overflow-x: auto;
    text-align: center;
}
.formula-description {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin: 0;
}

.formula-hero-image {
    width: 100%;
    max-width: 350px;
    height: auto;
    display: block;
    margin: 20px auto;
    border-radius: 8px;
    box-shadow: 0 4px 8px var(--shadow-color);
}

.load-more-container {
    display: flex;
    justify-content: center;
    margin-top: 2rem;
}

.load-more-container .btn {
    text-decoration: none;
    padding: 0.8rem 2rem;
    font-weight: 500;
    border-radius: 25px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.load-more-container .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-color);
}

/* New Sections Styles */
.content-section {
    padding: 3rem 0;
    border-top: 1px solid var(--border-color);
}
.content-section:first-of-type {
    border-top: none;
    padding-top: 1rem;
}
.section-title {
    text-align: center;
    font-size: 2.2rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-weight: 700;
    position: relative;
}
.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 3rem auto;
    line-height: 1.7;
}
.section-title::after {
    content: '';
    display: block;
    width: 70px;
    height: 4px;
    background-color: var(--accent-color);
    margin: 0.5rem auto 0;
    border-radius: 2px;
}
.text-content {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
}
.text-content h3 {
    margin-top: 1.5rem;
    color: var(--text-primary);
}
.info-grid, .pioneers-grid {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.info-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    text-align: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border: 1px solid var(--border-color);
}
.info-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--shadow-color);
}
.info-card .icon {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
    line-height: 1;
}
.info-card h3 {
    font-size: 1.4rem;
    margin-bottom: 0.75rem;
}
.info-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}
.pioneer-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    text-align: center;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.pioneer-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--shadow-color);
}
.pioneer-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 0 auto 1rem;
    object-fit: cover;
    border: 3px solid var(--border-color);
}
.pioneer-card h3 {
    margin: 0 0 0.5rem 0;
    color: var(--text-primary);
}
.pioneer-contribution {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}
.cta-section {
    background: linear-gradient(135deg, var(--accent-color), color-mix(in srgb, var(--accent-color) 70%, #000));
    color: white;
    text-align: center;
    padding: 4rem 2rem;
    border-radius: var(--border-radius);
    margin: 2rem 0;
}
.cta-section h2 {
    font-size: 2.5rem;
    margin-top: 0;
    margin-bottom: 1rem;
}
.cta-section p {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 2rem;
    opacity: 0.9;
}
.cta-btn {
    background-color: white;
    color: var(--accent-color);
    text-decoration: none;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    font-weight: 600;
    transition: transform 0.2s ease, background-color 0.2s ease;
    display: inline-block;
}
.cta-btn:hover {
    background-color: #f0f0f0;
    transform: scale(1.05);
}
.faq-section { max-width: 900px; margin: 3rem auto; }
.faq-section details { background-color: var(--card-bg); border: 1px solid var(--border-color); margin-bottom: 1rem; border-radius: 8px; box-shadow: var(--card-shadow); }
.faq-section summary { display: flex; justify-content: space-between; align-items: center; padding: 1rem 1.5rem; font-weight: 600; font-size: 1.2rem; cursor: pointer; list-style: none; }
.faq-section summary::-webkit-details-marker { display: none; }
.faq-section summary::after { content: '+'; font-size: 1.5rem; color: var(--accent-color); transition: transform 0.3s ease; }
.faq-section details[open] summary::after { transform: rotate(45deg); }
.faq-answer { padding: 0 1.5rem 1.5rem; line-height: 1.7; color: var(--text-secondary); }

@media (max-width: 768px) {
    .subject-section h2 { font-size: 1.8rem; }
    .chapter-card-link { flex: 0 0 250px; }
    .formula-category-title { font-size: 1.6rem; }
    .formula-title { font-size: 1.1rem; }
    .formula-expression { font-size: 1.1rem; }
    .section-title { font-size: 1.8rem; }
    .cta-section h2 { font-size: 2rem; }
}
@media (max-width: 480px) {
    .education-header .education-description { font-size: 1rem; }
    .subject-section h2 { font-size: 1.5rem; }
    .chapter-card-link { flex: 0 0 220px; }
    .chapter-title { font-size: 1.2rem; }
    .chapter-description { font-size: 0.9rem; }
}