/* =========================================================
   COURSE HEADER
   ========================================================= */

.course-site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface);
    box-shadow: 0 2px 14px rgba(15, 23, 42, 0.06);
}

.course-header-main {
    width: 100%;
}

.course-header-inner {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    min-height: 76px;
}

.course-site-brand {
    display: inline-flex;
    align-items: center;
    flex: 0 0 auto;
    gap: 0.7rem;
    color: var(--color-text);
    text-decoration: none;
}

.course-site-brand-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    height: 2.75rem;
    border-radius: var(--radius-md);
    background: var(--color-primary);
    color: var(--color-white);
    font-size: 1.15rem;
}

.course-site-brand-text {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.course-site-brand-text strong {
    color: var(--color-text);
    font-size: 1rem;
    font-weight: 800;
    line-height: 1.25;
}

.course-site-brand-text small {
    margin-top: 0.15rem;
    color: var(--color-text-muted);
    font-size: 0.7rem;
    line-height: 1.25;
}

.course-header-navigation {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
    gap: 0.2rem;
    min-width: 0;
}

.course-header-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.5rem;
    padding: 0.55rem 0.7rem;
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    font-size: 0.8rem;
    font-weight: 650;
    line-height: 1.3;
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
    transition:
        color var(--transition-fast),
        background-color var(--transition-fast);
}

.course-header-link:hover,
.course-header-link:focus-visible {
    background: rgba(53, 104, 89, 0.08);
    color: var(--color-primary);
}

.course-header-help {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    gap: 0.45rem;
    min-height: 2.5rem;
    padding: 0.65rem 0.9rem;
    border-radius: var(--radius-pill);
    background: var(--color-primary);
    color: var(--color-white);
    font-size: 0.78rem;
    font-weight: 750;
    text-decoration: none;
    white-space: nowrap;
    transition:
        background-color var(--transition-fast),
        transform var(--transition-fast);
}

.course-header-help:hover {
    background: var(--color-secondary);
    color: var(--color-white);
    transform: translateY(-1px);
}

.course-header-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    height: 2.75rem;
    margin-left: auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    color: var(--color-text);
    cursor: pointer;
}


/* =========================================================
   RESPONSIVE
   ========================================================= */

@media (max-width: 1199px) {

    .course-header-inner {
        gap: 1rem;
    }

    .course-header-link {
        padding-inline: 0.5rem;
        font-size: 0.75rem;
    }

    .course-header-help {
        padding-inline: 0.75rem;
    }
}


@media (max-width: 991px) {

    .course-header-inner {
        position: relative;
        flex-wrap: wrap;
        padding-top: 0.75rem;
        padding-bottom: 0.75rem;
    }

    .course-header-toggle {
        display: inline-flex;
    }

    .course-header-navigation {
        display: none;
        flex-basis: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 0.25rem;
        padding-top: 0.75rem;
        border-top: 1px solid var(--color-border);
    }

    .course-header-navigation.is-open {
        display: flex;
    }

    .course-header-link {
        justify-content: flex-start;
        min-height: 2.75rem;
        padding: 0.7rem 0.85rem;
        text-align: left;
    }

    .course-header-help {
        margin-left: auto;
    }
}


@media (max-width: 575px) {

    .course-header-inner {
        min-height: 68px;
    }

    .course-site-brand-icon {
        width: 2.4rem;
        height: 2.4rem;
        font-size: 1rem;
    }

    .course-site-brand-text strong {
        font-size: 0.9rem;
    }

    .course-site-brand-text small {
        font-size: 0.65rem;
    }

    .course-header-help {
        padding: 0.6rem;
    }

    .course-header-help span {
        display: none;
    }
}


@media (prefers-reduced-motion: reduce) {

    .course-header-link,
    .course-header-help {
        transition: none;
    }
}