/* ============================================
   COURSES SECTION
   ============================================ */
.courses-section {
    background: var(--background);
}

.course-filters {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.filter-chip {
    padding: 0.5rem 1rem;
    background: rgba(var(--button-bg-rgb), 0.1);
    color: var(--button-bg);
    border: 1px solid var(--button-bg);
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-chip:hover,
.filter-chip.active {
    background: var(--button-bg);
    color: white;
}

.courses-grid-enhanced {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-top: 3rem;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
}

.course-flip-card {
    background-color: transparent;
    width: 100%;
    height: 240px;
    perspective: 1000px;
    cursor: pointer;
}

.course-flip-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.course-flip-front,
.course-flip-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.course-flip-front {
    transform: rotateY(0deg);
}

.course-flip-back {
    transform: rotateY(180deg);
    background: linear-gradient(135deg, var(--button-bg), var(--button-hover));
}

.course-flip-card:hover .course-flip-inner {
    transform: rotateY(180deg);
}

.course-flip-icon {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    color: var(--heading);
    transition: transform 0.3s ease;
}

.course-flip-back .course-flip-icon {
    color: white;
}

.course-flip-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text);
    text-align: center;
    margin-bottom: 1rem;
}

.course-flip-back .course-flip-title {
    color: white;
}

.course-flip-level {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.course-flip-back .course-flip-level {
    color: rgba(255, 255, 255, 0.9);
}

.course-flip-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
}

.course-flip-stat {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.course-flip-back .course-flip-stat {
    color: rgba(255, 255, 255, 0.95);
}

/* Auto-flip animation */
@keyframes autoFlip {
    0%, 40% {
        transform: rotateY(0deg);
    }
    50%, 90% {
        transform: rotateY(180deg);
    }
    100% {
        transform: rotateY(360deg);
    }
}

.course-flip-card:nth-child(1) .course-flip-inner { animation: autoFlip 24s infinite 0s; }
.course-flip-card:nth-child(2) .course-flip-inner { animation: autoFlip 24s infinite 3s; }
.course-flip-card:nth-child(3) .course-flip-inner { animation: autoFlip 24s infinite 6s; }
.course-flip-card:nth-child(4) .course-flip-inner { animation: autoFlip 24s infinite 9s; }
.course-flip-card:nth-child(5) .course-flip-inner { animation: autoFlip 24s infinite 12s; }
.course-flip-card:nth-child(6) .course-flip-inner { animation: autoFlip 24s infinite 15s; }
.course-flip-card:nth-child(7) .course-flip-inner { animation: autoFlip 24s infinite 18s; }
.course-flip-card:nth-child(8) .course-flip-inner { animation: autoFlip 24s infinite 21s; }

.view-more-btn {
    display: inline-flex;
    align-items: center;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--button-bg), var(--button-hover));
    color: white;
    border-radius: 50px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 20px rgba(var(--button-bg-rgb), 0.3);
}

.view-more-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(var(--button-bg-rgb), 0.4);
}