:root {
    --linkedin-blue: #0077B5;
    --sidebar-width: 240px;
}

body {
    background-color: #f8f9fa;
    min-height: 100vh;
}

.navbar-linkedin {
    background-color: var(--linkedin-blue);
    height: 52px;
    padding: 0 16px;
}

.sidebar {
    width: var(--sidebar-width);
    background-color: #fff;
    border-right: 1px solid #e0e0e0;
    position: fixed;
    top: 52px;
    bottom: 0;
    left: 0;
    z-index: 1000;
    overflow-y: auto;
    transition: transform 0.3s ease;
}

.main-content {
    margin-left: var(--sidebar-width);
    margin-top: 52px;
    transition: margin 0.3s ease;
    padding: 24px;
    min-height: calc(100vh - 52px);
}

@media (max-width: 991.98px) {
    .sidebar {
        transform: translateX(-100%);
        width: 280px;
    }

    .sidebar.active {
        transform: translateX(0);
        box-shadow: 2px 0 8px rgba(0, 0, 0, 0.1);
    }

    .main-content {
        margin-left: 0;
        padding: 16px;
    }

    .sidebar-backdrop {
        position: fixed;
        top: 52px;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.3);
        z-index: 999;
        display: none;
    }

    .sidebar-backdrop.active {
        display: block;
    }
}

.nav-link {
    color: #666 !important;
    font-weight: 500;
    padding: 8px 16px;
    margin: 4px 8px;
    border-radius: 4px;
    display: flex;
    align-items: center;
}

.nav-link.active {
    color: var(--linkedin-blue) !important;
    font-weight: 600;
    background-color: #e8f4f8;
}

.course-card {
    border-radius: 8px;
    overflow: hidden;
    transition: transform 0.2s;
    background: white;
    height: 100%;
}

.course-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.course-thumbnail {
    height: 180px;
    object-fit: cover;
    width: 100%;
}

.quiz-answer {
    padding: 12px;
    border: 1px solid #dee2e6;
    border-radius: 6px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.quiz-answer:hover {
    background-color: #f8f9fa;
}

.quiz-answer.selected {
    border-color: var(--linkedin-blue);
    background-color: #e8f4f8;
}

.quiz-answer.correct {
    border-color: #28a745;
    background-color: #d4edda;
}

.quiz-answer.incorrect {
    border-color: #dc3545;
    background-color: #f8d7da;
}

.skill-icon {
    font-size: 2.5rem;
    color: var(--linkedin-blue);
    margin-bottom: 16px;
}