/* ═══════════════════════════════════════════════
   clfsec Course System Styles
   ═══════════════════════════════════════════════ */

/* ─── Course Card ─── */
.clfsec-course-card {
    position: relative;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.clfsec-course-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
}
.clfsec-course-cover-wrapper {
    position: relative;
}
.clfsec-course-cover {
    transition: transform 0.3s ease;
}
.clfsec-course-card:hover .clfsec-course-cover {
    transform: scale(1.03);
}
.clfsec-course-card .clfsec-difficulty-badge {
    position: absolute;
    top: 0;
    right: 0;
    padding: 0.3rem 1.2rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: #fff;
    border-radius: 0 12px 0 12px;
    z-index: 1;
}

/* ─── Progress Bar (card) ─── */
.clfsec-progress-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: rgba(255, 255, 255, 0.3);
}

/* ─── Chapter Accordion ─── */
.accordion-button.chapter-toggle:not(.collapsed) {
    background: var(--clfsec-primary) !important;
    color: #fff !important;
    box-shadow: none !important;
}
.accordion-button.chapter-toggle:focus {
    box-shadow: none !important;
    border-color: var(--clfsec-primary) !important;
}
.accordion-button.chapter-toggle i.fa-check-circle {
    margin-left: auto;
}

/* ─── Chapter Content ─── */
.chapter-content img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    margin: 1rem 0;
}
.chapter-content pre,
.course-content pre {
    background: var(--clfsec-bg-secondary);
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    border: 1px solid var(--clfsec-border);
}
.chapter-content code,
.course-content code {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}
.course-content img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
}

/* ─── Mark Complete Button ─── */
.mark-complete-btn {
    transition: all 0.2s ease;
}
.mark-complete-btn:hover:not(:disabled) {
    opacity: 0.9;
    transform: translateY(-1px);
}
.mark-complete-btn:disabled {
    background: #22c55e !important;
    cursor: default;
    opacity: 0.8;
}

/* ─── Course Cover Placeholder ─── */
.clfsec-course-cover-placeholder {
    border-radius: 12px 12px 0 0;
}

/* ─── Instructor Avatar ─── */
.instructor-avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--clfsec-primary);
    color: #fff;
    font-size: 1.5rem;
    width: 56px;
    height: 56px;
    flex-shrink: 0;
}

/* ─── Preview Video ─── */
.ratio iframe {
    border-radius: 8px;
}

/* ─── Page Header Stats ─── */
.clfsec-course-stats {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

/* ─── Animation ─── */
@keyframes progress-fill {
    from { width: 0; }
}
.clfsec-course-card .clfsec-progress-bar > div {
    animation: progress-fill 0.6s ease;
}