* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
    min-height: 100vh;
    overflow-x: hidden;
}

/* Left Sidebar Styles */
.sidebar {
    width: 280px;
    height: 100vh;
    padding: 2rem;
    position: fixed;
    left: 0;
    top: 0;
    transition: transform 0.3s ease;
    z-index: 50;
}

.sidebar-header {
    color: white;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.sidebar-header i {
    font-size: 2rem;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 1rem;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    border-radius: 12px;
    margin-bottom: 0.5rem;
    transition: all 0.2s ease;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    transform: translateX(5px);
}

.nav-link i {
    margin-right: 1rem;
    font-size: 1.25rem;
}

/* Main Content Styles */
.main-content {
    margin-left: 280px;
    padding: 2rem;
    flex: 1;
}


/* Content Card Styles */
.content-card {
    border-radius: 20px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}


.content-title {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.content-text {
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

/* Add these styles for the related-topics section */
.related-topics {
    padding: 1.25rem;
    border-radius: 12px;
}

.related-topics h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1rem;
}

.related-topics ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.related-topics li {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    cursor: pointer;
}

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

.related-topics a {
    color: inherit;
    text-decoration: none;
}

/* Exercise Section Styles */
.exercise-section {
    padding: 1.5rem;
    border-radius: 12px;
    color: white;
    margin-top: 2rem;
    position: relative;
    overflow: hidden;
}

.exercise-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1));
    pointer-events: none;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    padding: 0.75rem 1.25rem;
    border-radius: 10px;
    text-decoration: none;
    margin: 0.5rem;
    backdrop-filter: blur(5px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.download-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
        padding: 1rem;
    }
}

/* Active nav link style */
.nav-link.active {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    font-weight: 600;
}

/* List style improvement */
.content-text li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
}

.content-text li::before {
    content: '•';
    position: absolute;
    left: 0;
    font-weight: bold;
}

.menu-toggle {
    padding: 0.75rem;
    border-radius: 10px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}