/* Subtopic Page Styles */

/* Topic Navigation */
.topic-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: #f8f9fb;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.topic-navigation a {
    color: var(--primary-color);
    font-weight: 500;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.topic-navigation a:hover {
    color: var(--primary-dark);
}

.topic-path {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.topic-path .current {
    color: var(--text-primary);
    font-weight: 500;
}

/* Subtopic Content */
.subtopic-content {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

.subtopic-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.subtopic-header h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.header-divider {
    height: 4px;
    width: 80px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    margin: 0 auto;
    border-radius: 2px;
}

/* Content Sections */
.content-section {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-glass);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.content-section h2 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.section-content {
    color: var(--text-secondary);
}

.section-content strong {
    color: var(--text-primary);
}

/* Info Box */
.info-box {
    background: linear-gradient(135deg, rgba(67, 97, 238, 0.1), rgba(114, 9, 183, 0.1));
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    border-left: 4px solid var(--primary-color);
}

.info-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

/* Images */
.image-container {
    margin: var(--spacing-lg) 0;
    text-align: center;
}

.image-container img {
    max-width: 100%;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
}

.caption {
    margin-top: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
}

/* Code Container */
.code-container {
    margin: var(--spacing-lg) 0;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.code-container pre {
    margin: 0;
    padding: 0;
}

.code-container code {
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    padding: var(--spacing-lg);
    overflow-x: auto;
    display: block;
}

/* Applications Grid */
.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.application-card {
    background: white;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.application-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.app-icon {
    width: 50px;
    height: 50px;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

.application-card h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.application-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* Resources */
.resources-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.resource-group h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.resource-list {
    list-style-type: none;
    margin-left: 0;
    padding-left: var(--spacing-md);
}

.resource-list li {
    margin-bottom: var(--spacing-sm);
    position: relative;
    padding-left: var(--spacing-md);
}

.resource-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

.resource-list a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.resource-list a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.resource-placeholder {
    opacity: 0.7;
    font-style: italic;
}

/* Accordion for Interview Questions */
.accordion {
    margin-top: var(--spacing-lg);
}

.accordion-item {
    margin-bottom: var(--spacing-md);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: var(--border-radius-md);
    overflow: hidden;
}

.accordion-header {
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.accordion-header:hover {
    background-color: rgba(67, 97, 238, 0.05);
}

.accordion-header h3 {
    margin-bottom: 0;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-primary);
}

.toggle-icon {
    transition: transform var(--transition-fast);
}

.accordion-content {
    padding: 0 var(--spacing-lg);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal), padding var(--transition-normal);
}

.accordion-item.active .accordion-content {
    padding: var(--spacing-lg);
    max-height: 1000px;
}

.accordion-item.active .toggle-icon {
    transform: rotate(45deg);
}

/* Navigation Buttons */
.navigation-buttons {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-xl);
}

.nav-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: white;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    border-radius: var(--border-radius-md);
    font-weight: 500;
    transition: all var(--transition-normal);
}

.nav-button:hover {
    background-color: var(--primary-color);
    color: white;
}

.nav-button.next {
    background-color: var(--primary-color);
    color: white;
}

.nav-button.next:hover {
    background-color: var(--primary-dark);
}

/* Responsive Design */
@media (max-width: 768px) {
    .topic-navigation {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .subtopic-header h1 {
        font-size: 2rem;
    }
    
    .content-section {
        padding: var(--spacing-md);
    }
    
    .content-section h2 {
        font-size: 1.3rem;
    }
    
    .applications-grid {
        grid-template-columns: 1fr;
    }
    
    .navigation-buttons {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .nav-button {
        width: 100%;
        justify-content: center;
    }
}