.breadcrumb-nav {
    padding: 12px 0 0 0;
}
.breadcrumb-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0;
    margin: 0 auto;
    padding: 0 20px;
    max-width: 1000px;
    font-size: 0.88rem;
}
.breadcrumb-list li {
    display: flex;
    align-items: center;
    color: #718096;
}
.breadcrumb-list li + li::before {
    content: '\203A';
    margin: 0 8px;
    color: #a0aec0;
    font-size: 1.1em;
}
.breadcrumb-list a {
    color: #4a6fa5;
    text-decoration: none;
    font-weight: 600;
}
.breadcrumb-list a:hover {
    color: #1a365d;
    border-bottom: none;
}
.book-hub-section {
    padding: 20px 0 32px 0;
}
.book-hub-section h1 {
    text-align: center;
    font-size: 1.8rem;
    font-weight: 800;
    color: #1d1d1f;
    margin-bottom: 8px;
}
.book-hub-intro {
    text-align: center;
    font-size: 1rem;
    color: #555;
    max-width: 640px;
    margin: 0 auto 24px auto;
    padding: 0 16px;
    line-height: 1.6;
}
.lesson-search-wrap {
    margin: 0 auto 14px auto;
    max-width: 640px;
    text-align: center;
}
.lesson-search-label {
    display: block;
    font-size: 1rem;
    font-weight: 700;
    color: #1d1d1f;
    margin-bottom: 8px;
}
.lesson-search-input {
    width: 100%;
    padding: 14px 18px;
    font-size: 1rem;
    border: 2px solid #4a6fa5;
    border-radius: 8px;
    outline: none;
    font-family: inherit;
    color: #1d1d1f;
    background: #ffffff;
    box-shadow: 0 2px 8px rgba(74, 111, 165, 0.10);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    box-sizing: border-box;
}
.lesson-search-input:focus {
    border-color: #d46b2a;
    box-shadow: 0 0 0 3px rgba(212, 107, 42, 0.15);
}
.lesson-search-hint {
    font-size: 0.875rem;
    color: #666;
    margin-top: 6px;
    min-height: 1.2em;
}
.search-results-label {
    font-size: 1rem;
    font-weight: 700;
    color: #1d1d1f;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 2px solid #e0e0e0;
}
.search-no-results {
    padding: 20px;
    text-align: center;
    color: #666;
    font-style: italic;
}
@media (max-width: 600px) {
    .book-hub-section h1 {
        font-size: 1.5rem;
    }
    .book-hub-intro {
        font-size: 0.95rem;
    }
}