/* Course Detail Page */

.course-hero__badge {
    display: inline-block;
    margin: 0 0 0.85rem;
    padding: 0.35rem 0.85rem;
    color: #ffffff;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    background: rgba(255, 255, 255, 0.14);
    border: 1px solid rgba(255, 255, 255, 0.28);
    border-radius: 999px;
}

.course-detail__layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 2rem;
    align-items: start;
}

.course-detail__main {
    min-width: 0;
}

.course-detail__media {
    margin: 0 0 2rem;
    overflow: hidden;
    border-radius: 20px;
    box-shadow: 0 16px 45px rgba(15, 40, 90, 0.1);
}

.course-detail__media img {
    width: 100%;
    height: auto;
    min-height: 260px;
    max-height: 420px;
    object-fit: cover;
}

.course-detail__section + .course-detail__section {
    margin-top: 2.5rem;
}

.course-detail__heading {
    margin: 0 0 1rem;
    color: #0a1e3d;
    font-size: 1.375rem;
    font-weight: 800;
    line-height: 1.25;
}

.course-detail__highlights {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 0.75rem;
}

.course-detail__highlights li {
    position: relative;
    padding: 0.85rem 1rem 0.85rem 2.5rem;
    background: #ffffff;
    border: 1px solid #e2e9f3;
    border-radius: 12px;
    font-size: 0.9375rem;
    line-height: 1.6;
}

.course-detail__highlights li::before {
    content: "✓";
    position: absolute;
    left: 1rem;
    top: 0.9rem;
    color: #0056e0;
    font-weight: 700;
}

.course-detail__tags,
.course-detail__tools,
.course-detail__careers {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.course-detail__tags li,
.course-detail__tools li {
    padding: 0.55rem 0.9rem;
    color: #1a2b4a;
    font-size: 0.875rem;
    background: #ffffff;
    border: 1px solid #d0dbe8;
    border-radius: 999px;
}

.course-detail__careers li {
    position: relative;
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.25rem;
    color: #1a2b4a;
    font-size: 0.9375rem;
    background: #ffffff;
    border: 1px solid #e2e9f3;
    border-radius: 12px;
}

.course-detail__careers li::before {
    content: "→";
    position: absolute;
    left: 0.85rem;
    color: #0056e0;
    font-weight: 700;
}

.course-detail__syllabus {
    display: grid;
    gap: 0.75rem;
}

.course-detail__module,
.course-detail__faq-item {
    background: #ffffff;
    border: 1px solid #e2e9f3;
    border-radius: 14px;
    overflow: hidden;
}

.course-detail__module summary,
.course-detail__faq-item summary {
    padding: 1rem 1.15rem;
    color: #0a1e3d;
    font-size: 0.9375rem;
    font-weight: 700;
    cursor: pointer;
    list-style: none;
}

.course-detail__module summary::-webkit-details-marker,
.course-detail__faq-item summary::-webkit-details-marker {
    display: none;
}

.course-detail__module summary::after,
.course-detail__faq-item summary::after {
    content: "+";
    float: right;
    color: #0056e0;
    font-size: 1.125rem;
    line-height: 1;
}

.course-detail__module[open] summary::after,
.course-detail__faq-item[open] summary::after {
    content: "−";
}

.course-detail__module ul {
    margin: 0;
    padding: 0 1.15rem 1rem 2.5rem;
    list-style: disc;
}

.course-detail__module li + li {
    margin-top: 0.35rem;
}

.course-detail__faq {
    display: grid;
    gap: 0.75rem;
}

.course-detail__faq-item p {
    margin: 0;
    padding: 0 1.15rem 1rem;
    font-size: 0.9375rem;
    line-height: 1.7;
    color: #5a6578;
}

.course-detail__sidebar {
    display: grid;
    gap: 1.25rem;
    position: sticky;
    top: calc(var(--nav-height, 80px) + 1rem);
}

.course-detail__card,
.course-detail__related {
    padding: 1.5rem;
    background: #ffffff;
    border: 1px solid #e2e9f3;
    border-radius: 18px;
    box-shadow: 0 12px 35px rgba(15, 40, 90, 0.06);
}

.course-detail__card-label {
    display: inline-block;
    margin: 0 0 0.5rem;
    color: #0056e0;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.course-detail__card-title {
    margin: 0 0 1rem;
    color: #0a1e3d;
    font-size: 1.0625rem;
    font-weight: 800;
}

.course-detail__meta {
    margin: 0 0 1.25rem;
}

.course-detail__meta div + div {
    margin-top: 0.85rem;
    padding-top: 0.85rem;
    border-top: 1px solid #eef2f7;
}

.course-detail__meta dt {
    margin: 0 0 0.2rem;
    color: #0056e0;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.course-detail__meta dd {
    margin: 0;
    color: #1a2b4a;
    font-size: 0.9375rem;
    line-height: 1.5;
}

.course-detail__card .btn + .btn {
    margin-top: 0.65rem;
}

.course-detail__related ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.course-detail__related li + li {
    margin-top: 0.35rem;
}

.course-detail__related a {
    display: block;
    padding: 0.55rem 0.65rem;
    color: #1a2b4a;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 8px;
    transition: background 0.15s ease, color 0.15s ease;
}

.course-detail__related a:hover,
.course-detail__related a:focus-visible {
    background: #eef4ff;
    color: #0056e0;
    outline: none;
}

@media (max-width: 992px) {
    .course-detail__layout {
        grid-template-columns: 1fr;
    }

    .course-detail__sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .course-detail__media img {
        min-height: 200px;
        max-height: 280px;
    }

    .course-detail__section + .course-detail__section {
        margin-top: 2rem;
    }
}