/* ==========================================================================
   KTVC THEME – COURSES SECTION STYLES
   ========================================================================== */

/* ==========================================================================
   1. FILTER TABS
   ========================================================================== */
.courses-filter {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-2);
    justify-content: center;
    margin-bottom: var(--space-10);
}

.courses-filter__btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: 0.55rem 1.25rem;
    border-radius: var(--radius-full);
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: var(--font-semi);
    color: var(--color-text-muted);
    background: var(--color-white);
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.courses-filter__btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(120, 4, 3, 0.04);
}

.courses-filter__btn.is-active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-primary);
}

.courses-filter__btn i {
    font-size: 0.75rem;
}

/* ==========================================================================
   2. COURSES GRID
   ========================================================================== */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
    margin-bottom: var(--space-10);
}

/* Archive uses 3 columns (sidebar takes 1) */
.courses-grid--archive {
    grid-template-columns: repeat(3, 1fr);
}

/* Hidden cards during filter */
.course-card.is-hidden {
    display: none;
}

/* ==========================================================================
   3. COURSE CARD
   ========================================================================== */
.course-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    border: var(--border-width) solid var(--border-color);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.course-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

/* Thumbnail area */
.course-card__thumb {
    position: relative;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: var(--color-light-gray);
    flex-shrink: 0;
}

.course-card__img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
    display: block;
}

.course-card:hover .course-card__img {
    transform: scale(1.05);
}

/* Placeholder when no featured image */
.course-card__thumb-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: rgba(255,255,255,.4);
    font-size: 3rem;
    text-decoration: none;
}

/* Level badge on thumbnail */
.course-card__level-badge {
    position: absolute;
    top: var(--space-3);
    left: var(--space-3);
    background: var(--color-primary);
    color: var(--color-white);
    font-size: var(--text-xs);
    font-weight: var(--font-semi);
    padding: 0.25rem 0.65rem;
    border-radius: var(--radius-full);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    box-shadow: var(--shadow-sm);
    line-height: 1.4;
}

/* Body */
.course-card__body {
    padding: var(--space-5);
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Department label */
.course-card__dept {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-xs);
    font-weight: var(--font-semi);
    color: var(--color-secondary-dark);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: var(--space-2);
}

.course-card__dept i {
    font-size: 0.65rem;
}

/* Title */
.course-card__title {
    font-size: var(--text-base);
    font-weight: var(--font-bold);
    line-height: var(--leading-tight);
    margin-bottom: var(--space-3);
    flex: 1;
}

.course-card__title a {
    color: var(--color-heading);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.course-card__title a:hover {
    color: var(--color-primary);
}

/* Excerpt */
.course-card__excerpt {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    line-height: var(--leading-loose);
    margin-bottom: var(--space-4);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Meta chips row */
.course-card__meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: auto;
}

.course-meta-chip {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    background: var(--color-off-white);
    border: var(--border-width) solid var(--border-color);
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-full);
}

.course-meta-chip i {
    font-size: 0.6rem;
    color: var(--color-primary);
}

/* Footer */
.course-card__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-5);
    border-top: var(--border-width) solid var(--border-color);
    background: var(--color-off-white);
    gap: var(--space-3);
}

.course-card__fee {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-xs);
    font-weight: var(--font-semi);
    color: var(--color-success);
}

.course-card__fee i {
    font-size: 0.65rem;
}

.course-card__fee--empty {
    flex: 1;
}

.course-card__cta {
    flex-shrink: 0;
    white-space: nowrap;
}

/* ==========================================================================
   4. SECTION FOOTER (view all button)
   ========================================================================== */
.courses-section__footer {
    text-align: center;
    padding-top: var(--space-4);
}

/* ==========================================================================
   5. EMPTY STATE
   ========================================================================== */
.courses-empty {
    text-align: center;
    padding: var(--space-20) var(--space-8);
}

.courses-empty__icon {
    font-size: 4rem;
    color: var(--color-mid-gray);
    margin-bottom: var(--space-6);
}

.courses-empty h3 {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-4);
    color: var(--color-heading);
}

.courses-empty p {
    color: var(--color-text-muted);
    max-width: 480px;
    margin-inline: auto;
    margin-bottom: var(--space-6);
}

/* ==========================================================================
   6. ARCHIVE LAYOUT (2-column: main + sidebar)
   ========================================================================== */
.archive-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: var(--space-10);
    align-items: start;
}

/* ==========================================================================
   7. ARCHIVE SIDEBAR
   ========================================================================== */
.archive-sidebar {
    position: sticky;
    top: calc(var(--header-main-height) + var(--space-6));
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

.sidebar-widget {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    border: var(--border-width) solid var(--border-color);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
}

.sidebar-widget__title {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-base);
    font-weight: var(--font-bold);
    color: var(--color-heading);
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-4);
    border-bottom: 2px solid var(--color-light-gray);
}

.sidebar-widget__title i {
    color: var(--color-primary);
    font-size: 0.9rem;
}

.sidebar-filter-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.sidebar-filter-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    color: var(--color-text);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.sidebar-filter-link:hover,
.sidebar-filter-link.is-active {
    background: rgba(120, 4, 3, 0.06);
    color: var(--color-primary);
}

.sidebar-filter-link.is-active {
    font-weight: var(--font-semi);
}

.sidebar-filter-count {
    font-size: var(--text-xs);
    font-weight: var(--font-semi);
    background: var(--color-light-gray);
    color: var(--color-text-muted);
    padding: 0.15rem 0.5rem;
    border-radius: var(--radius-full);
    min-width: 24px;
    text-align: center;
}

.sidebar-filter-link.is-active .sidebar-filter-count {
    background: var(--color-primary);
    color: var(--color-white);
}

/* CTA sidebar widget */
.sidebar-widget--cta {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-color: var(--color-primary);
}

.sidebar-cta {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.sidebar-cta__icon {
    font-size: 2.5rem;
    color: rgba(255,255,255,.3);
}

.sidebar-cta h3 {
    font-size: var(--text-lg);
    color: var(--color-white);
}

.sidebar-cta p {
    font-size: var(--text-sm);
    color: rgba(255,255,255,.8);
}

.sidebar-cta .btn-outline {
    color: var(--color-white);
    border-color: rgba(255,255,255,.5);
}

.sidebar-cta .btn-outline:hover {
    background: rgba(255,255,255,.15);
    border-color: var(--color-white);
}

/* ==========================================================================
   8. SINGLE COURSE PAGE
   ========================================================================== */
.single-course-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: var(--space-10);
    align-items: start;
}

.single-course-thumb {
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--space-8);
    box-shadow: var(--shadow-md);
}

.single-course-thumb__img {
    width: 100%;
    height: auto;
    display: block;
}

.entry-content {
    font-size: var(--text-base);
    line-height: var(--leading-loose);
    color: var(--color-text);
}

.entry-content h2 {
    font-size: var(--text-2xl);
    margin-top: var(--space-8);
    margin-bottom: var(--space-4);
}

.entry-content h3 {
    font-size: var(--text-xl);
    margin-top: var(--space-6);
    margin-bottom: var(--space-3);
}

.entry-content p {
    margin-bottom: var(--space-5);
}

.entry-content ul,
.entry-content ol {
    list-style: disc;
    padding-left: var(--space-6);
    margin-bottom: var(--space-5);
}

.entry-content ul li,
.entry-content ol li {
    margin-bottom: var(--space-2);
}

/* Course facts sidebar card */
.course-facts-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    border: var(--border-width) solid var(--border-color);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: calc(var(--header-main-height) + var(--space-6));
}

.course-facts-card__title {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-base);
    font-weight: var(--font-bold);
    color: var(--color-white);
    background: var(--color-primary);
    padding: var(--space-4) var(--space-6);
}

.course-facts-card__title i {
    font-size: 0.9rem;
}

.course-facts-list {
    padding: var(--space-2) 0;
}

.course-facts-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: var(--space-3) var(--space-6);
    border-bottom: var(--border-width) solid var(--border-color);
    gap: var(--space-4);
}

.course-facts-item:last-child {
    border-bottom: none;
}

.course-facts-item__label {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-xs);
    font-weight: var(--font-semi);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    white-space: nowrap;
}

.course-facts-item__label i {
    color: var(--color-primary);
    font-size: 0.7rem;
    width: 14px;
    text-align: center;
}

.course-facts-item__value {
    font-size: var(--text-sm);
    font-weight: var(--font-semi);
    color: var(--color-heading);
    text-align: right;
}

.course-facts-card__actions {
    padding: var(--space-5) var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    background: var(--color-off-white);
    border-top: var(--border-width) solid var(--border-color);
}

.course-facts-card__actions .btn {
    width: 100%;
    justify-content: center;
}

/* Related courses list */
.related-courses-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.related-course-item {
    display: flex;
    gap: var(--space-3);
    align-items: flex-start;
}

.related-course-item__thumb {
    width: 64px;
    height: 48px;
    border-radius: var(--radius-md);
    overflow: hidden;
    flex-shrink: 0;
}

.related-course-item__thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.related-course-item__info {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.related-course-item__title {
    font-size: var(--text-sm);
    font-weight: var(--font-semi);
    color: var(--color-heading);
    text-decoration: none;
    line-height: var(--leading-tight);
    transition: color var(--transition-fast);
}

.related-course-item__title:hover {
    color: var(--color-primary);
}

.related-course-item__meta {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

.related-course-item__meta i {
    font-size: 0.6rem;
    color: var(--color-primary);
}

/* ==========================================================================
   9. AOS ANIMATION UTILITY
   Used by courses section + other sections
   ========================================================================== */
.aos {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 600ms ease, transform 600ms ease;
}

.aos.aos-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================================
   10. RESPONSIVE — TABLET (max 1024px)
   ========================================================================== */
@media (max-width: 1024px) {

    .courses-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .courses-grid--archive {
        grid-template-columns: repeat(2, 1fr);
    }

    .archive-layout {
        grid-template-columns: 1fr;
    }

    .archive-sidebar {
        position: static;
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-4);
    }

    .single-course-layout {
        grid-template-columns: 1fr;
    }

    .single-course-sidebar {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-5);
        align-items: start;
    }

    .course-facts-card {
        position: static;
    }
}

/* ==========================================================================
   11. RESPONSIVE — MOBILE (max 768px)
   ========================================================================== */
@media (max-width: 768px) {

    .courses-grid {
        grid-template-columns: 1fr;
    }

    .courses-grid--archive {
        grid-template-columns: 1fr;
    }

    .courses-filter {
        gap: var(--space-2);
        justify-content: flex-start;
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: var(--space-2);
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }

    .courses-filter::-webkit-scrollbar {
        display: none;
    }

    .courses-filter__btn {
        flex-shrink: 0;
    }

    .archive-sidebar {
        grid-template-columns: 1fr;
    }

    .single-course-sidebar {
        grid-template-columns: 1fr;
    }
}