/* KNOWLEDGE PAGE */
.knowledge-page {
    max-width: 1000px;
    margin: 60px auto;
    padding: 30px;
    background: #f5f9ff;
    border-radius: 15px;
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.1);
    font-family: Arial, sans-serif;
    line-height: 1.7;
}

/* Tiêu đề chính */
.knowledge-page h1 {
    text-align: center;
    color: #0077cc;
    margin-bottom: 30px;
    font-size: 28px;
}

/* Tiêu đề phụ */
.knowledge-page h2 {
    color: #005599;
    margin-top: 30px;
    margin-bottom: 10px;
    font-size: 20px;
}

/* Danh sách */
.knowledge-page ul {
    padding-left: 20px;
    margin-bottom: 15px;
}

.knowledge-page li {
    margin-bottom: 8px;
}

/* VIDEO SECTION */

.video-title {
    margin-top: 50px;
    text-align: center;
    color: #2a7ae2;
    font-size: 24px;
}

/* Container video */
.video-container {
    display: flex;
    gap: 30px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 30px;
}

/* Card từng video */
.video-box {
    width: 100%;
    max-width: 420px;
    background: #ffffff;
    padding: 15px;
    border-radius: 15px;
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.1);
    transition: 0.3s ease;
}

.video-box:hover {
    transform: translateY(-6px);
}

/* Video & iframe đồng bộ */
.video-box iframe,
.video-box video {
    width: 100%;
    height: 240px;
    border-radius: 12px;
}