.cm-course {
    color: #cbd5e1;
    padding-bottom: 3rem;
}

.cm-course-mast {
    padding: 2.1rem 0 1.4rem;
    background: linear-gradient(180deg, #0a1020, var(--cm-bg));
}

.cm-course-kicker {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin: 0 0 0.55rem;
    color: #93c5fd;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.cm-course-kicker a { color: inherit; }

.cm-course-mast h1 {
    margin: 0 0 0.55rem;
    color: #fff;
    font-family: "Sora", sans-serif;
    font-size: clamp(1.7rem, 3vw, 2.35rem);
}

.cm-course-lead {
    margin: 0 0 0.85rem;
    max-width: 40rem;
    color: #94a3b8;
    font-size: 1.02rem;
    line-height: 1.65;
}

.cm-course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem 1rem;
    color: #64748b;
    font-size: 0.86rem;
}

.cm-course-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.9rem;
}

.cm-course-tags span {
    padding: 0.22rem 0.65rem;
    border-radius: 999px;
    border: 1px solid var(--cm-border);
    background: rgba(15, 23, 42, 0.7);
    color: #93c5fd;
    font-size: 0.75rem;
    font-weight: 700;
}

.cm-course-shell {
    display: grid;
    gap: 1.4rem;
    padding-top: 1.4rem;
}

.cm-course-nav {
    position: sticky;
    top: 5.2rem;
    align-self: start;
    padding: 0.9rem;
    border: 1px solid var(--cm-border);
    border-radius: 1rem;
    background: var(--cm-surface);
}

.cm-course-nav-label {
    margin: 0 0 0.55rem;
    color: #64748b;
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.cm-course-nav-item {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 0.15rem 0.55rem;
    padding: 0.55rem 0.65rem;
    border-radius: 0.7rem;
    color: #cbd5e1;
    text-decoration: none;
}

.cm-course-nav-item em {
    grid-row: span 2;
    color: #64748b;
    font-style: normal;
    font-size: 0.72rem;
    font-weight: 800;
}

.cm-course-nav-item span {
    color: #e2e8f0;
    font-size: 0.9rem;
    font-weight: 650;
}

.cm-course-nav-item small {
    grid-column: 2;
    color: #64748b;
    font-size: 0.72rem;
}

.cm-course-nav-item:hover,
.cm-course-nav-item.is-active {
    background: rgba(59, 130, 246, 0.12);
    color: #fff;
}

.cm-course-nav-item.is-active span { color: #93c5fd; }

.cm-course-cover {
    margin: 0 0 1.2rem;
}

.cm-course-cover img {
    width: 100%;
    max-height: 280px;
    object-fit: cover;
    border-radius: 1rem;
}

.cm-course-prose {
    color: #dbe4f0;
    line-height: 1.75;
}

.cm-course-prose h2,
.cm-course-prose h3 {
    color: #fff;
    margin-top: 1.4rem;
}

.cm-course-start { margin-top: 1.5rem; }

.cm-course-pager {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-top: 2rem;
    padding-top: 1.2rem;
    border-top: 1px solid var(--cm-border);
}

.cm-course-pager-btn {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    padding: 0.85rem 1rem;
    border: 1px solid var(--cm-border);
    border-radius: 0.9rem;
    background: var(--cm-surface);
    color: inherit;
    text-decoration: none;
}

.cm-course-pager-btn.is-next { text-align: right; }

.cm-course-pager-btn span {
    color: #64748b;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.cm-course-pager-btn strong {
    color: #fff;
    font-size: 0.95rem;
}

.cm-course-pager-btn:hover {
    border-color: rgba(96, 165, 250, 0.45);
}

@media (min-width: 960px) {
    .cm-course-shell {
        grid-template-columns: 260px minmax(0, 1fr);
        gap: 2rem;
        align-items: start;
    }
}