body {
    background: #f5f7fb;
    font-family: Inter,sans-serif;
    color: #0c1c36;
}

.aa-container {
    max-width: 1400px;
    margin: auto;
    padding: 40px;
}

.aa-breadcrumbs {
    font-size: 14px;
    margin-bottom: 10px;
    color: #6b7280;
}

.aa-title {
    font-size: 64px;
    line-height: 1;
    font-weight: 800;
    margin-bottom: 40px;
}

.aa-layout {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 30px;
    align-items: start;
}

.aa-video iframe {
    width: 100%;
    height: 700px;
    border-radius: 24px;
}

.aa-tabs-wrap {
    background: #fff;
    margin-top: 30px;
    border-radius: 24px;
    padding: 40px;
}

.aa-tabs {
    display: flex;
    gap: 30px;
    border-bottom: 1px solid #e5e7eb;
    margin-bottom: 30px;
}

.aa-tab {
    background: none;
    border: none;
    padding-bottom: 15px;
    cursor: pointer;
    font-size: 18px;
    font-weight: 600;
    color: #6b7280;
}

.aa-tab.active {
    color: #0c1c36;
    border-bottom: 2px solid #0c1c36;
}

.aa-tab-content {
    display: none;
}

.aa-tab-content.active {
    display: block;
}

.aa-overview-grid {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 40px;
}

.aa-content {
    font-size: 20px;
    line-height: 1.8;
}

.aa-content h2 {
    font-size: 38px;
    margin-top: 40px;
}

.aa-takeaways {
    background: #eef3ff;
    border-radius: 20px;
    padding: 30px;
}

.aa-takeaways h3 {
    margin-bottom: 20px;
}

.aa-takeaways ul {
    padding-left: 20px;
}

.aa-takeaways li {
    margin-bottom: 18px;
}

.aa-sidebar {
    position: sticky;
    top: 40px;
}

.aa-card {
    background: #fff;
    border-radius: 24px;
    padding: 30px;
    margin-bottom: 25px;
}

.aa-progress-bar {
    background: #dbe4f3;
    height: 8px;
    border-radius: 30px;
    overflow: hidden;
    margin: 15px 0;
}

.aa-progress-bar span {
    display: block;
    height: 100%;
    background: #49d17d;
    border-radius: 30px;
}

.aa-lesson-item {
    display: block;
    padding: 18px;
    border-radius: 18px;
    margin-bottom: 12px;
    background: #f9fafb;
    text-decoration: none;
    color: #0c1c36;
    transition: .2s;
}

.aa-lesson-item.active {
    background: #dce8ff;
    border-left: 4px solid #0c1c36;
}

.aa-next-btn {
    display: block;
    width: 100%;
    background: #003b5c;
    color: #fff;
    text-align: center;
    padding: 22px;
    border-radius: 18px;
    text-decoration: none;
    font-weight: 700;
}

.aa-resources a {
    display: block;
    padding: 16px 20px;
    background: #f9fafb;
    border-radius: 14px;
    margin-bottom: 15px;
    text-decoration: none;
}

@media(max-width: 1024px){

    .aa-layout {
        grid-template-columns: 1fr;
    }

    .aa-overview-grid {
        grid-template-columns: 1fr;
    }

    .aa-title {
        font-size: 42px;
    }

    .aa-video iframe {
        height: 400px;
    }

}