.ciit-course-environment-body {
    margin: 0;
    background: #f7f9fc;
    color: #1d2b44;
}

.ciit-course-environment-header {
    position: sticky;
    top: 0;
    z-index: 1030;
    border-bottom: 1px solid #e5eaf2;
    background: rgba(255, 255, 255, .96);
    backdrop-filter: blur(12px);
}

.ciit-course-environment-header-inner {
    min-height: 72px;
    display: grid;
    grid-template-columns: auto minmax(180px, 1fr) auto auto;
    align-items: center;
    gap: 24px;
}

.ciit-course-environment-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: #13284b;
    font-size: 1.12rem;
    font-weight: 800;
    text-decoration: none;
    white-space: nowrap;
}

.ciit-course-environment-brand > span:last-child span {
    color: #14a6d8;
}

.ciit-course-environment-brand-mark {
    display: grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border-radius: 10px;
    background: linear-gradient(135deg, #1769ff, #12b6d8);
    color: #fff;
    font-size: .95rem;
    font-weight: 800;
}

.ciit-course-environment-context {
    min-width: 0;
    padding-left: 24px;
    border-left: 1px solid #e5eaf2;
}

.ciit-course-environment-label {
    display: block;
    color: #8a96a8;
    font-size: .68rem;
    font-weight: 800;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.ciit-course-environment-context strong {
    display: block;
    overflow: hidden;
    margin-top: 2px;
    color: #13284b;
    font-size: .92rem;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.ciit-course-environment-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

.ciit-course-environment-nav a {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 9px 11px;
    border-radius: 9px;
    color: #5b6a82;
    font-size: .82rem;
    font-weight: 700;
    text-decoration: none;
}

.ciit-course-environment-nav a:hover,
.ciit-course-environment-nav a.active {
    background: #eef5ff;
    color: #1769ff;
}

.ciit-course-environment-account {
    display: flex;
    align-items: center;
    gap: 10px;
}

.ciit-course-environment-user {
    max-width: 180px;
    overflow: hidden;
    color: #6e7b90;
    font-size: .78rem;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.ciit-course-signout {
    padding: 7px 12px;
    font-size: .78rem;
    font-weight: 700;
}

.ciit-course-environment-main {
    min-height: calc(100vh - 72px);
}

.ciit-course-environment-footer {
    padding: 18px 0;
    border-top: 1px solid #e5eaf2;
    background: #fff;
    color: #8190a6;
    font-size: .78rem;
}

.ciit-course-environment-footer a {
    color: #5e6f88;
    text-decoration: none;
}

.ciit-course-environment-footer a:hover {
    color: #1769ff;
}

@media (max-width: 1199.98px) {
    .ciit-course-environment-header-inner {
        grid-template-columns: auto minmax(140px, 1fr) auto;
        gap: 14px;
    }

    .ciit-course-environment-account {
        display: none;
    }
}

@media (max-width: 767.98px) {
    .ciit-course-environment-header-inner {
        min-height: 64px;
        grid-template-columns: auto 1fr;
        gap: 12px;
    }

    .ciit-course-environment-context {
        display: none;
    }

    .ciit-course-environment-nav {
        justify-content: flex-end;
    }

    .ciit-course-environment-nav a {
        padding: 8px;
    }

    .ciit-course-environment-nav a span {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .ciit-course-environment-body * {
        scroll-behavior: auto !important;
        transition: none !important;
    }
}