* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f8f9fa;
    padding-top: 56px;
    min-height: 100vh;
}

/* Sidebar Overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
    backdrop-filter: blur(2px);
    transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
    display: block;
}

/* Hero Banner */
.ba-hero-banner {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 4rem 2rem;
    position: relative;
    overflow: hidden;
    margin-bottom: 0;
}

.ba-hero-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.1)"/></svg>');
    opacity: 0.3;
    animation: ba-float 20s linear infinite;
}

@keyframes ba-float {
    0% { transform: translateY(0); }
    100% { transform: translateY(-100px); }
}

.ba-hero-container {
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.ba-hero-content {
    text-align: center;
    color: white;
    margin-bottom: 3rem;
}

.ba-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    animation: ba-badge-pulse 2s ease-in-out infinite;
}

@keyframes ba-badge-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.ba-hero-badge i {
    font-size: 1.1rem;
    animation: ba-icon-rotate 3s linear infinite;
}

@keyframes ba-icon-rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.ba-hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.25rem;
    line-height: 1.2;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    animation: ba-slide-up 0.8s ease-out;
}

@keyframes ba-slide-up {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.ba-hero-subtitle {
    font-size: 1.25rem;
    line-height: 1.6;
    margin-bottom: 2rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.95;
    animation: ba-slide-up 0.8s ease-out 0.2s both;
}

.ba-hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2.5rem;
    animation: ba-slide-up 0.8s ease-out 0.4s both;
}

.ba-hero-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.ba-hero-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.ba-hero-btn:hover::before {
    width: 300px;
    height: 300px;
}

.ba-hero-btn span {
    position: relative;
    z-index: 1;
}

.ba-hero-btn i {
    position: relative;
    z-index: 1;
    font-size: 1.2rem;
}

.ba-hero-btn-primary {
    background: white;
    color: #667eea;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.ba-hero-btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
}

.ba-hero-btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid white;
    backdrop-filter: blur(10px);
}

.ba-hero-btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-3px);
}

.ba-hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
    animation: ba-slide-up 0.8s ease-out 0.6s both;
}

.ba-hero-stat {
    text-align: center;
}

.ba-stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.25rem;
    color: white;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.ba-stat-label {
    font-size: 1rem;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
}

.ba-hero-steps {
    background: white;
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: ba-slide-up 0.8s ease-out 0.8s both;
}

.ba-steps-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    color: #2d3748;
    margin-bottom: 2rem;
}

.ba-steps-container {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1.5rem;
}

.ba-step {
    text-align: center;
    position: relative;
    padding: 1.5rem 1rem;
    border-radius: 15px;
    transition: all 0.3s ease;
    animation: ba-step-fade 0.6s ease-out both;
}

.ba-step:nth-child(1) { animation-delay: 1s; }
.ba-step:nth-child(2) { animation-delay: 1.1s; }
.ba-step:nth-child(3) { animation-delay: 1.2s; }
.ba-step:nth-child(4) { animation-delay: 1.3s; }
.ba-step:nth-child(5) { animation-delay: 1.4s; }

@keyframes ba-step-fade {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.ba-step:hover {
    background: #f7fafc;
    transform: translateY(-5px);
}

.ba-step-number {
    position: absolute;
    top: -10px;
    right: -10px;
    width: 35px;
    height: 35px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    animation: ba-number-bounce 2s ease-in-out infinite;
}

@keyframes ba-number-bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.ba-step-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
    transition: all 0.3s ease;
}

.ba-step:hover .ba-step-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.4);
}

.ba-step h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: #2d3748;
    margin-bottom: 0.5rem;
}

.ba-step p {
    font-size: 0.9rem;
    color: #666;
    line-height: 1.5;
    margin: 0;
}

/* Main Container */
.ba-main-wrap {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Tab Section */
.ba-tab-area {
    background: transparent;
    padding: 1rem 0;
    border-radius: 0;
    margin-bottom: 1rem;
    box-shadow: none;
}

.ba-tab-system {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
}

/* Dropdown System */
.ba-dropdown-wrap {
    position: relative;
    flex: 1;
}

.ba-dropdown-trigger {
    background: white;
    color: #2d3748;
    border: 2px solid #e2e8f0;
    padding: 0.8rem 1.2rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.8rem;
    width: 240px;
    transition: all 0.3s;
}

.ba-dropdown-trigger:hover {
    border-color: #667eea;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.15);
}

.ba-dropdown-trigger.ba-active {
    border-color: #667eea;
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    box-shadow: 0 2px 12px rgba(102, 126, 234, 0.25);
}

.ba-dropdown-label {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.ba-dropdown-caret {
    transition: transform 0.3s;
    font-size: 0.85rem;
}

.ba-dropdown-trigger.ba-active .ba-dropdown-caret {
    transform: rotate(180deg);
}

.ba-dropdown-list {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    width: 280px;
    background: white;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.12);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.3s;
    max-height: 280px;
    overflow-y: auto;
}

.ba-dropdown-list.ba-show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.ba-dropdown-section {
    border-bottom: 1px solid #f1f5f9;
    margin-bottom: 0.3rem;
}

.ba-dropdown-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.ba-section-title {
    padding: 0.6rem 1rem;
    background: linear-gradient(45deg, #f7fafc, #edf2f7);
    font-weight: 600;
    color: #2d3748;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    border-bottom: 1px solid #e2e8f0;
}

.ba-dropdown-option {
    padding: 0.6rem 1.2rem;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    color: #4a5568;
    font-size: 0.8rem;
}

.ba-dropdown-option:hover {
    background: #f7fafc;
    color: #667eea;
    padding-left: 1.5rem;
}

.ba-dropdown-option.ba-selected {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
}

.ba-dropdown-option.ba-selected:hover {
    background: linear-gradient(45deg, #5a67d8, #553c9a);
    padding-left: 1.2rem;
}

.ba-dropdown-option i {
    font-size: 0.9rem;
    width: 16px;
    text-align: center;
}

/* Search Box */
.ba-search-area {
    flex-shrink: 0;
}

.ba-search-wrap {
    position: relative;
    width: 260px;
}

.ba-search-field {
    width: 100%;
    padding: 0.8rem 3rem 0.8rem 1rem;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 0.9rem;
    outline: none;
    transition: all 0.3s;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.ba-search-field:focus {
    border-color: #667eea;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.15);
}

.ba-search-ico {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: #9ca3af;
    font-size: 1rem;
}

/* Course Grid */
.ba-grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.ba-course-item {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    transition: transform 0.3s, box-shadow 0.3s;
    position: relative;
    border: 1px solid #e2e8f0;
    width: 100%;
    display: flex;
    flex-direction: column;
}

.ba-course-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.12);
}

.ba-media-wrap {
    height: 180px;
    background: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.ba-media-wrap::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s;
}

.ba-media-wrap:hover::before {
    left: 100%;
}

.ba-video-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.ba-media-wrap:hover .ba-video-thumb {
    transform: scale(1.05);
}

.ba-play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.7);
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: all 0.3s;
    opacity: 0.8;
}

.ba-media-wrap:hover .ba-play-btn {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.1);
    background: rgba(102, 126, 234, 0.9);
}

.ba-time-badge {
    position: absolute;
    bottom: 0.5rem;
    right: 0.5rem;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 500;
}

.ba-type-badge {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: rgba(255, 255, 255, 0.95);
    color: #667eea;
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: bold;
    backdrop-filter: blur(10px);
}

.ba-level-badge {
    position: absolute;
    top: 0.5rem;
    left: 0.5rem;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.2rem 0.6rem;
    border-radius: 10px;
    font-size: 0.7rem;
    font-weight: 500;
}

.ba-course-body {
    padding: 1rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.ba-course-name {
    font-size: 1.1rem;
    font-weight: bold;
    margin-bottom: 0.6rem;
    color: #2d3748;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    position: relative;
    cursor: pointer;
    transition: all 0.3s;
}

.ba-course-name:hover {
    color: #667eea;
    transform: translateX(3px);
}

.ba-course-name::after {
    content: '✨';
    position: absolute;
    right: 0;
    top: 0;
    opacity: 0;
    transform: scale(0);
    transition: all 0.3s;
}

.ba-course-item:hover .ba-course-name::after {
    opacity: 1;
    transform: scale(1);
}

.ba-course-desc {
    color: #666;
    margin-bottom: 0.8rem;
    line-height: 1.4;
    font-size: 0.85rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.ba-rating-section {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.8rem;
    flex-wrap: wrap;
}

.ba-star-wrap {
    display: flex;
    gap: 0.2rem;
}

.ba-star {
    color: #ffc107;
    font-size: 0.8rem;
    transition: all 0.3s;
    cursor: pointer;
}

.ba-star:hover {
    transform: scale(1.3) rotate(15deg);
    filter: drop-shadow(0 0 3px #ffc107);
}

.ba-rating-section:hover .ba-star {
    animation: ba-star-twinkle 0.5s ease-in-out;
}

@keyframes ba-star-twinkle {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

.ba-rating-count {
    color: #666;
    font-size: 0.8rem;
}

.ba-instructor-info {
    background: #f8f9fa;
    padding: 0.6rem;
    border-radius: 8px;
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.ba-instructor-pic {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(45deg, #667eea, #764ba2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 0.7rem;
    position: relative;
    overflow: hidden;
}

.ba-instructor-pic::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255,255,255,0.3), transparent);
    transform: rotate(45deg);
    animation: ba-avatar-shine 2s infinite;
}

@keyframes ba-avatar-shine {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    50% { transform: translateX(0%) translateY(0%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

.ba-instructor-details h4 {
    color: #2d3748;
    font-size: 0.8rem;
    margin-bottom: 0.1rem;
    line-height: 1;
}

.ba-instructor-details p {
    color: #666;
    font-size: 0.7rem;
    line-height: 1;
}

.ba-stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
    margin-bottom: 0.8rem;
    font-size: 0.75rem;
    color: #666;
}

.ba-stat-row {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.ba-stat-row i {
    font-size: 0.7rem;
    width: 12px;
}

.ba-action-buttons {
    display: flex;
    gap: 0.5rem;
    align-items: stretch;
    margin-top: auto;
}

.ba-btn {
    padding: 0.6rem 0.8rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 600;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
    flex: 1;
    min-height: 32px;
    white-space: nowrap;
}

.ba-btn i {
    font-size: 0.75rem;
}

.ba-btn-preview {
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
}

.ba-btn-primary {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
}

.ba-btn-secondary {
    background: transparent;
    color: #4a5568;
    border: 2px solid #e2e8f0;
}

.ba-btn-continue {
    background: linear-gradient(45deg, #48bb78, #38a169);
    color: white;
}

.ba-btn-exam {
    background: linear-gradient(45deg, #ed8936, #dd6b20);
    color: white;
}

.ba-btn-donate {
    background: linear-gradient(45deg, #e53e3e, #c53030);
    color: white;
}

.ba-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* Course Counter - Hidden */
.ba-counter-section {
    display: none;
}

.ba-counter-text {
    font-weight: 600;
    color: #2d3748;
    font-size: 1.1rem;
}

.ba-sort-select {
    padding: 0.8rem 1.5rem;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    background: white;
    color: #4a5568;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s;
}

.ba-sort-select:focus {
    border-color: #667eea;
    outline: none;
}

/* Pagination */
.ba-pagination-footer {
    width: 100%;
    display: flex;
    justify-content: flex-end;
    padding: 0 1.5rem 1.5rem;
}

.ba-pagination-wrap {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 0.8rem;
    margin: 1rem 0 0;
    background: transparent;
    padding: 0;
    border-radius: 0;
    width: auto;
}

.ba-pagination-data {
    color: #666;
    font-size: 0.9rem;
    font-weight: 500;
}

.ba-pagination-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.ba-page-btn {
    padding: 0.8rem 1rem;
    border: 2px solid #e2e8f0;
    background: white;
    color: #4a5568;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.3s;
    min-width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ba-page-btn:hover:not(:disabled) {
    border-color: #667eea;
    color: #667eea;
    transform: translateY(-1px);
}

.ba-page-btn.ba-current {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    border-color: #667eea;
}

.ba-page-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

#baPageNumbers {
    display: flex;
    gap: 0.3rem;
}

/* No Results */
.ba-empty-state {
    text-align: center;
    padding: 5rem 2rem;
    color: #666;
    background: white;
    border-radius: 20px;
    margin: 2rem 0;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.ba-empty-state i {
    font-size: 5rem;
    margin-bottom: 2rem;
    color: #667eea;
    opacity: 0.7;
}

.ba-empty-state h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: #2d3748;
}

.ba-empty-state p {
    font-size: 1.1rem;
    color: #666;
}

/* Modal */
.ba-modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.ba-modal-panel {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    padding: 2.5rem;
    border-radius: 25px;
    max-width: 1000px;
    width: 95%;
    max-height: 90vh;
    overflow-y: auto;
}

.ba-modal-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid #e2e8f0;
}

.ba-modal-heading {
    font-size: 2rem;
    font-weight: bold;
    color: #2d3748;
}

.ba-close-button {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: #666;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.3s;
}

.ba-close-button:hover {
    background: #f7fafc;
    color: #e53e3e;
}

.ba-video-container {
    width: 100%;
    height: 350px;
    background: linear-gradient(45deg, #2d3748, #4a5568);
    border-radius: 20px;
    margin-bottom: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.ba-video-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0) 50%);
}

.ba-lesson-list {
    list-style: none;
}

.ba-lesson-row {
    padding: 1.5rem;
    border: 2px solid #e2e8f0;
    border-radius: 15px;
    margin-bottom: 1rem;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.ba-lesson-row:hover {
    border-color: #667eea;
    background: #f7fafc;
    transform: translateX(8px);
}

.ba-lesson-row.ba-completed {
    background: #f0fff4;
    border-color: #48bb78;
}

.ba-lesson-row.ba-locked {
    opacity: 0.6;
    cursor: not-allowed;
}

.ba-lesson-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(45deg, #667eea, #764ba2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

.ba-lesson-data {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.ba-lesson-text h4 {
    color: #2d3748;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.ba-lesson-text small {
    color: #666;
}

.ba-lesson-icon {
    font-size: 1.4rem;
}

.ba-progress-track {
    width: 100%;
    height: 12px;
    background: #e2e8f0;
    border-radius: 6px;
    margin: 1.5rem 0;
    overflow: hidden;
}

.ba-progress-bar {
    height: 100%;
    background: linear-gradient(45deg, #667eea, #764ba2);
    transition: width 0.5s ease;
}

.ba-certificate-card {
    background: linear-gradient(135deg, #ffd700, #ffed4e);
    color: #2d3748;
    padding: 3rem;
    border-radius: 25px;
    text-align: center;
    margin: 2rem 0;
    border: 5px solid #f6ad55;
    position: relative;
    overflow: hidden;
}

.ba-certificate-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 10px,
        rgba(255,255,255,0.1) 10px,
        rgba(255,255,255,0.1) 20px
    );
    animation: ba-cert-shine 3s linear infinite;
}

@keyframes ba-cert-shine {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

.ba-certificate-card h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

.ba-certificate-card p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    position: relative;
    z-index: 1;
}

/* Responsive Design */
@media (max-width: 1400px) {
    .ba-grid-container {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

@media (max-width: 1200px) {
    .ba-grid-container {
        grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    }

    .ba-dropdown-trigger {
        width: 220px;
    }

    .ba-search-wrap {
        width: 240px;
    }

    .ba-main-wrap {
        padding: 1.5rem 1rem;
    }
}

@media (max-width: 1000px) {
    .ba-hero-title {
        font-size: 2.75rem;
    }

    .ba-hero-subtitle {
        font-size: 1.15rem;
    }

    .ba-steps-container {
        grid-template-columns: repeat(3, 1fr);
    }

    .ba-tab-system {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }

    .ba-dropdown-wrap {
        width: 100%;
    }

    .ba-dropdown-trigger {
        width: 100%;
        max-width: 100%;
    }

    .ba-search-area {
        width: 100%;
    }

    .ba-search-wrap {
        width: 100%;
        max-width: 100%;
    }

    .ba-dropdown-list {
        width: 100%;
        max-width: 100%;
    }
}

@media (max-width: 900px) {
    .ba-hero-title {
        font-size: 2.25rem;
    }

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

    .ba-grid-container {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    body {
        padding-top: 56px;
    }

    .ba-hero-banner {
        padding: 2.5rem 1.25rem;
    }

    .ba-hero-title {
        font-size: 2rem;
    }

    .ba-hero-subtitle {
        font-size: 1rem;
    }

    .ba-hero-buttons {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }

    .ba-hero-btn {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
        justify-content: center;
    }

    .ba-hero-stats {
        gap: 1.5rem;
    }

    .ba-stat-number {
        font-size: 2rem;
    }

    .ba-stat-label {
        font-size: 0.85rem;
    }

    .ba-hero-steps {
        padding: 1.5rem 1rem;
    }

    .ba-steps-title {
        font-size: 1.5rem;
        margin-bottom: 1.5rem;
    }

    .ba-steps-container {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .ba-step {
        padding: 1.25rem 1rem;
    }

    .ba-step-icon {
        width: 70px;
        height: 70px;
        font-size: 1.75rem;
    }

    .ba-step h4 {
        font-size: 1rem;
    }

    .ba-step p {
        font-size: 0.85rem;
    }

    .ba-main-wrap {
        padding: 1.25rem 0.875rem;
    }

    .ba-grid-container {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .ba-modal-panel {
        width: 95%;
        padding: 1.25rem;
        margin: 1rem;
        border-radius: 16px;
    }

    .ba-modal-heading {
        font-size: 1.5rem;
    }

    .ba-video-container {
        height: 250px;
        border-radius: 12px;
    }

    .ba-tab-area {
        padding: 0;
        margin-bottom: 1.25rem;
    }

    .ba-dropdown-trigger {
        width: 100%;
        font-size: 0.9rem;
        padding: 0.875rem 1.125rem;
    }

    .ba-dropdown-option {
        padding: 0.875rem 1.125rem;
        font-size: 0.875rem;
    }

    .ba-section-title {
        padding: 0.5rem 1rem;
        font-size: 0.7rem;
    }

    .ba-media-wrap {
        height: 180px;
    }

    .ba-course-body {
        padding: 1rem 0.875rem;
    }

    .ba-course-name {
        font-size: 1rem;
    }

    .ba-course-desc {
        font-size: 0.8rem;
    }

    .ba-pagination-wrap {
        flex-direction: column;
        gap: 0.75rem;
        align-items: center;
    }

    .ba-pagination-footer {
        justify-content: center;
        padding: 0 0.875rem 1.25rem;
    }

    .ba-pagination-controls {
        width: 100%;
        justify-content: center;
    }

    .ba-page-btn {
        padding: 0.75rem 0.875rem;
        font-size: 0.85rem;
        min-width: 38px;
        height: 38px;
    }

    .ba-counter-section {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .ba-action-buttons {
        flex-direction: row;
        gap: 0.5rem;
    }

    .ba-btn {
        padding: 0.75rem 0.625rem;
        font-size: 0.7rem;
        flex: 1;
    }

    .ba-lesson-row {
        padding: 1.125rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 0.875rem;
    }

    .ba-lesson-data {
        width: 100%;
    }

    .ba-lesson-text h4 {
        font-size: 1rem;
    }

    .ba-certificate-card {
        padding: 2rem 1.25rem;
    }

    .ba-certificate-card h2 {
        font-size: 1.75rem;
    }

    .ba-certificate-card p {
        font-size: 1.1rem;
    }
}

@media (max-width: 640px) {
    .ba-grid-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .ba-main-wrap {
        padding: 1rem 0.75rem;
    }

    .ba-hero-banner {
        padding: 2rem 1rem;
    }

    .ba-hero-badge {
        font-size: 0.8rem;
        padding: 0.4rem 1rem;
    }

    .ba-hero-title {
        font-size: 1.75rem;
        margin-bottom: 1rem;
    }

    .ba-hero-subtitle {
        font-size: 0.95rem;
        margin-bottom: 1.5rem;
    }

    .ba-hero-buttons {
        margin-bottom: 2rem;
    }

    .ba-hero-btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.95rem;
    }

    .ba-hero-stats {
        gap: 1.25rem;
        grid-template-columns: repeat(2, 1fr);
        display: grid;
    }

    .ba-stat-number {
        font-size: 1.75rem;
    }

    .ba-stat-label {
        font-size: 0.8rem;
    }

    .ba-hero-steps {
        padding: 1.25rem 0.875rem;
        border-radius: 15px;
    }

    .ba-steps-title {
        font-size: 1.35rem;
    }

    .ba-steps-container {
        gap: 1rem;
    }

    .ba-step {
        padding: 1rem 0.75rem;
    }

    .ba-step-number {
        width: 30px;
        height: 30px;
        font-size: 0.9rem;
    }

    .ba-step-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }

    .ba-media-wrap {
        height: 200px;
    }

    .ba-stats-grid {
        grid-template-columns: 1fr;
        gap: 0.375rem;
    }

    .ba-action-buttons {
        flex-direction: column;
        gap: 0.625rem;
    }

    .ba-btn {
        width: 100%;
        padding: 0.75rem 1rem;
        font-size: 0.8rem;
    }

    .ba-modal-panel {
        padding: 1rem;
        max-height: 95vh;
    }

    .ba-pagination-footer {
        padding: 0 0.75rem 1rem;
    }
}

@media (max-width: 480px) {
    .ba-hero-banner {
        padding: 1.75rem 0.875rem;
    }

    .ba-hero-badge {
        font-size: 0.75rem;
        padding: 0.35rem 0.875rem;
    }

    .ba-hero-badge i {
        font-size: 1rem;
    }

    .ba-hero-title {
        font-size: 1.5rem;
        margin-bottom: 0.875rem;
    }

    .ba-hero-subtitle {
        font-size: 0.875rem;
        margin-bottom: 1.25rem;
    }

    .ba-hero-btn {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
        gap: 0.5rem;
    }

    .ba-hero-btn i {
        font-size: 1rem;
    }

    .ba-hero-stats {
        gap: 1rem;
    }

    .ba-stat-number {
        font-size: 1.5rem;
    }

    .ba-stat-label {
        font-size: 0.75rem;
    }

    .ba-hero-steps {
        padding: 1rem 0.75rem;
    }

    .ba-steps-title {
        font-size: 1.25rem;
        margin-bottom: 1.25rem;
    }

    .ba-step {
        padding: 0.875rem 0.625rem;
    }

    .ba-step-number {
        width: 28px;
        height: 28px;
        font-size: 0.85rem;
        top: -8px;
        right: -8px;
    }

    .ba-step-icon {
        width: 55px;
        height: 55px;
        font-size: 1.35rem;
        margin-bottom: 0.75rem;
    }

    .ba-step h4 {
        font-size: 0.95rem;
        margin-bottom: 0.375rem;
    }

    .ba-step p {
        font-size: 0.8rem;
    }

    .ba-dropdown-trigger {
        padding: 0.75rem 1rem;
        font-size: 0.85rem;
    }

    .ba-search-field {
        padding: 0.75rem 2.5rem 0.75rem 1rem;
        font-size: 0.85rem;
    }

    .ba-course-name {
        font-size: 0.95rem;
    }

    .ba-course-desc {
        font-size: 0.75rem;
        -webkit-line-clamp: 3;
    }

    .ba-media-wrap {
        height: 180px;
    }

    .ba-play-btn {
        width: 32px;
        height: 32px;
        font-size: 0.875rem;
    }

    .ba-instructor-info {
        padding: 0.5rem;
    }

    .ba-instructor-details h4 {
        font-size: 0.75rem;
    }

    .ba-instructor-details p {
        font-size: 0.65rem;
    }

    .ba-page-btn {
        padding: 0.625rem 0.75rem;
        min-width: 36px;
        height: 36px;
        font-size: 0.8rem;
    }

    .ba-empty-state {
        padding: 3rem 1rem;
    }

    .ba-empty-state i {
        font-size: 3.5rem;
    }

    .ba-empty-state h3 {
        font-size: 1.4rem;
    }

    .ba-empty-state p {
        font-size: 0.95rem;
    }
}