/* Subtopic Page Styles */
.subtopic-container {
    padding: 40px 0 80px;
}

.breadcrumb {
    margin-bottom: 30px;
    font-size: 14px;
    color: var(--dark-gray);
}

.breadcrumb a {
    color: var(--primary-color);
    transition: var(--transition);
}

.breadcrumb a:hover {
    color: var(--secondary-color);
}

.subtopic-header {
    margin-bottom: 40px;
}

.subtopic-header h1 {
    font-size: 36px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.subtopic-meta {
    display: flex;
    gap: 20px;
    font-size: 14px;
    color: var(--dark-gray);
}

.subtopic-meta span {
    display: flex;
    align-items: center;
}

.subtopic-meta i {
    margin-right: 5px;
    color: var(--primary-color);
}

.content-section {
    background-color: var(--light-color);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 30px;
    overflow: hidden;
}

.section-header {
    background-color: var(--primary-color);
    padding: 15px 25px;
    display: flex;
    align-items: center;
}

.section-header h2 {
    font-size: 22px;
    margin-bottom: 0;
    color: var(--light-color);
    display: flex;
    align-items: center;
}

.section-header h2 i {
    margin-right: 10px;
}

.section-content {
    padding: 30px;
}

.section-content h3 {
    font-size: 20px;
    color: var(--primary-color);
    margin-top: 25px;
    margin-bottom: 15px;
}

.section-content p {
    margin-bottom: 15px;
}

.section-content ul, 
.section-content ol {
    margin-bottom: 20px;
}

.section-content li {
    margin-bottom: 8px;
}

/* Info Box */
.info-box {
    background-color: rgba(0, 116, 189, 0.1);
    border-left: 4px solid var(--primary-color);
    padding: 15px 20px;
    margin: 20px 0;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

/* Code Block */
.code-block {
    background-color: #282c34;
    border-radius: var(--border-radius);
    margin: 20px 0;
    overflow: hidden;
}

.code-block pre {
    margin: 0;
    padding: 20px;
    overflow-x: auto;
}

.code-block code {
    font-family: 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.5;
}

/* Video Resources */
.video-resources {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.video-card {
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    background-color: var(--light-color);
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.video-thumbnail {
    position: relative;
    overflow: hidden;
    padding-top: 56.25%; /* 16:9 aspect ratio */
}

.video-thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.video-card:hover .video-thumbnail img {
    transform: scale(1.05);
}

.play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background-color: rgba(0, 0, 0, 0.7);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--light-color);
    font-size: 24px;
    transition: var(--transition);
    opacity: 0.8;
}

.video-card:hover .play-btn {
    background-color: var(--primary-color);
    opacity: 1;
}

.video-info {
    padding: 15px;
}

.video-info h3 {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--dark-color);
}

.video-info p {
    font-size: 14px;
    color: var(--dark-gray);
    margin-bottom: 0;
}

/* Applications Grid */
.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.application-card {
    display: flex;
    align-items: center;
    background-color: #f9f9f9;
    border-radius: var(--border-radius);
    padding: 20px;
    transition: var(--transition);
}

.application-card:hover {
    background-color: rgba(0, 116, 189, 0.1);
}

.application-icon {
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
    flex-shrink: 0;
}

.application-icon i {
    font-size: 20px;
    color: var(--light-color);
}

.application-content h3 {
    font-size: 18px;
    margin-bottom: 5px;
    margin-top: 0;
}

.application-content p {
    font-size: 14px;
    margin-bottom: 0;
    color: var(--dark-gray);
}

/* MCQ Styles */
.mcq {
    margin-bottom: 30px;
}

.question {
    border: 1px solid #e0e0e0;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.question p {
    font-size: 16px;
    font-weight: 500;
    padding: 15px 20px;
    background-color: #f5f5f5;
    margin: 0;
}

.options {
    padding: 15px 20px;
}

.option {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
    cursor: pointer;
    padding: 8px 10px;
    border-radius: 4px;
    transition: var(--transition);
}

.option:hover {
    background-color: #f5f5f5;
}

.option input {
    margin-right: 10px;
}

.option-text {
    font-size: 15px;
}

.answer {
    padding: 15px 20px;
    background-color: #f0f7ff;
    border-top: 1px solid #e0e0e0;
    display: none;
}

.answer p {
    margin-bottom: 10px;
}

.answer p:last-child {
    margin-bottom: 0;
}

.check-btn {
    background-color: var(--primary-color);
    color: var(--light-color);
    border: none;
    padding: 8px 15px;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    margin: 0 20px 15px;
}

.check-btn:hover {
    background-color: #005ea6;
}

/* Interview Questions Styles */
.interview-question {
    margin-bottom: 20px;
    border: 1px solid #e0e0e0;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.interview-question h3 {
    font-size: 18px;
    padding: 15px 20px;
    margin: 0;
    background-color: #f5f5f5;
    border-bottom: 1px solid #e0e0e0;
}

.answer-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    background-color: var(--light-color);
    cursor: pointer;
    transition: var(--transition);
}

.answer-toggle:hover {
    background-color: #f9f9f9;
}

.answer-toggle span {
    font-size: 14px;
    font-weight: 500;
    color: var(--primary-color);
}

.answer-toggle i {
    transition: var(--transition);
}

.answer-content {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.interview-question.active .answer-toggle i {
    transform: rotate(180deg);
}

.interview-question.active .answer-content {
    max-height: 1000px;
    padding: 20px;
    border-top: 1px solid #e0e0e0;
}

/* Navigation Section */
.navigation-section {
    background-color: transparent;
    box-shadow: none;
}

.nav-buttons {
    display: flex;
    justify-content: space-between;
    gap: 20px;
}

/* Responsive Styles */
@media screen and (max-width: 992px) {
    .subtopic-header h1 {
        font-size: 32px;
    }
    
    .section-header h2 {
        font-size: 20px;
    }
}

@media screen and (max-width: 768px) {
    .subtopic-container {
        padding: 30px 0 60px;
    }
    
    .subtopic-header h1 {
        font-size: 28px;
    }
    
    .subtopic-meta {
        flex-direction: column;
        gap: 10px;
    }
    
    .section-content {
        padding: 20px;
    }
    
    .video-resources {
        grid-template-columns: 1fr;
    }
    
    .applications-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-buttons {
        flex-direction: column;
    }
}

@media screen and (max-width: 576px) {
    .subtopic-header h1 {
        font-size: 24px;
    }
    
    .section-header h2 {
        font-size: 18px;
    }
    
    .code-block code {
        font-size: 12px;
    }
    
    .application-icon {
        width: 40px;
        height: 40px;
    }
    
    .application-icon i {
        font-size: 16px;
    }
}