/* Courses page specific styles */
.courses-container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.courses-header {
    margin-bottom: 2rem;
}

.courses-header h1 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.course-filters {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.filter-btn {
    padding: 0.5rem 1.5rem;
    background-color: var(--background-light);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.filter-btn:hover,
.filter-btn.active {
    background-color: var(--primary-color);
    color: var(--text-color);
}

.filter-btn.premium {
    border-color: var(--primary-color);
    color: var(--text-color);
    position: relative;
    z-index: 1;
}

.filter-btn.premium:hover,
.filter-btn.premium.active {
    background-color: var(--primary-color);
    color: var(--text-color);
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.course-card {
    background-color: var(--background-light);
    border-radius: 8px;
    overflow: hidden;
    transition: transform 0.3s ease;
    position: relative;
}

.course-card:hover {
    transform: translateY(-5px);
}

.course-thumbnail {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}

.course-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.duration {
    position: absolute;
    bottom: 0.5rem;
    right: 0.5rem;
    background-color: rgba(0, 0, 0, 0.8);
    color: var(--text-color);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
}

.premium-badge {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background-color: var(--primary-color);
    color: var(--text-color);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}

.course-info {
    padding: 1rem;
}

.course-info h3.course-title {
    color: #ffffff !important;
}

.course-title {
    color: var(--text-color);
    font-size: 1rem;
    margin-bottom: 0.8rem;
    line-height: 1.4;
    height: 2.8em;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
}

.course-stats {
    display: flex;
    gap: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.8rem;
    flex-wrap: wrap;
}

.course-stats span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.course-price {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.original-price {
    color: var(--text-secondary);
    text-decoration: line-through;
    font-size: 0.9rem;
}

.current-price {
    color: var(--primary-color);
    font-size: 1.2rem;
    font-weight: 600;
}

.load-more {
    text-align: center;
    margin: 2rem 0;
}

.load-more-btn {
    padding: 0.8rem 2rem;
    background-color: var(--background-light);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.load-more-btn:hover {
    background-color: var(--primary-color);
    color: var(--text-color);
}

/* Premium Card Styles */
.premium-card {
    border: 1px solid var(--primary-color);
}

.premium-card .premium-badge {
    background: linear-gradient(45deg, var(--primary-color), var(--primary-hover));
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .course-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }

    .course-stats {
        font-size: 0.8rem;
        gap: 0.5rem;
    }

    .course-title {
        font-size: 0.9rem;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    .course-card {
        border: 2px solid #fff;
    }

    .premium-badge {
        border: 1px solid #fff;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    .course-card:hover {
        transform: none;
    }

    .course-card:hover .course-thumbnail img {
        transform: none;
    }

    .premium-card .premium-badge {
        animation: none;
    }
}

/* Courses page specific styles */
.courses-container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.courses-header {
    text-align: center;
    margin-bottom: 3rem;
}

.courses-header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.courses-header p {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

.course-packages {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.course-card {
    background-color: var(--background-light);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.course-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 20px rgba(255, 144, 0, 0.2);
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-hover));
}

.course-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background-color: rgba(255, 144, 0, 0.1);
    color: var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.course-badge.premium {
    background-color: rgba(255, 144, 0, 0.2);
    color: var(--primary-color);
    animation: pulse 2s infinite;
}

.course-price {
    text-align: center;
    margin: 2rem 0;
}

.course-price .currency {
    font-size: 1.5rem;
    color: var(--primary-color);
    vertical-align: top;
}

.course-price .amount {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
}

.course-price .period {
    color: var(--text-secondary);
    font-size: 1rem;
}

.course-features {
    margin: 1.5rem 0;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 0.8rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.feature-icon {
    font-size: 1.5rem;
    line-height: 1;
}

.feature-text {
    color: var(--text-color);
    font-size: 1.1rem;
    line-height: 1.4;
}

.course-title {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    line-height: 1.3;
}

.course-category {
    display: block;
    margin-bottom: 1rem;
}

.course-subtitle {
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-top: 1.5rem;
    text-align: center;
    font-style: italic;
}

.select-plan {
    width: 100%;
    padding: 1rem;
    background-color: var(--primary-color);
    color: var(--text-color);
    border: none;
    border-radius: 6px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
}

.select-plan:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(255, 144, 0, 0.3);
}

.courses-footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.guarantee, .security-notice {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    margin: 1rem;
    padding: 0.8rem 1.5rem;
    background-color: var(--background-light);
    border-radius: 30px;
    color: var(--text-secondary);
}

.guarantee-icon, .security-icon {
    width: 20px;
    height: 20px;
    filter: invert(1);
    opacity: 0.7;
}

/* Accessibility */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Filter tags */
.filter-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.filter-tag {
    background-color: var(--primary-color);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-tag button {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: 0;
    font-size: 1.2rem;
    line-height: 1;
}

.filter-tag button:hover {
    opacity: 0.8;
}

.featured-course {
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2.5rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.course-card.featured {
    padding: 2.5rem;
}

.course-header {
    margin-bottom: 2.5rem;
}

.course-title {
    font-size: 1.8rem;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}

.course-category {
    color: var(--text-secondary);
}

.course-subtitle {
    color: var(--text-secondary);
    font-size: 1.2rem;
}

.course-stats {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 1.2rem;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.course-price {
    margin-bottom: 1.5rem;
}

.price {
    font-size: 1.8rem;
    color: var(--text-color);
    font-weight: 600;
}

.course-actions {
    display: flex;
    gap: 1rem;
}

.action-btn {
    flex: 1;
    padding: 0.8rem;
    border: none;
    border-radius: 4px;
    background-color: var(--background-light);
    color: var(--text-color);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.action-btn:hover {
    background-color: var(--primary-color);
}

.like-btn, .bookmark-btn {
    background-color: #333;
}

.purchase-btn {
    background-color: var(--primary-color);
}

.purchase-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .section-title {
        font-size: 2rem;
    }

    .course-title {
        font-size: 1.5rem;
        flex-direction: column;
        gap: 0.3rem;
    }

    .course-stats {
        flex-wrap: wrap;
        gap: 1rem;
        font-size: 1rem;
    }

    .course-actions {
        flex-direction: column;
    }

    .feature-text {
        font-size: 1rem;
    }

    .course-subtitle {
        font-size: 1rem;
    }

    .feature-item {
        padding: 0.6rem 0;
    }

    .course-card.featured {
        padding: 1.5rem;
    }

    .details-btn {
        padding: 1rem 3rem;
        font-size: 1.1rem;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    .action-btn {
        border: 1px solid #fff;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    .purchase-btn:hover {
        transform: none;
    }
}

.package-section {
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2.5rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.course-card.featured {
    background-color: var(--background-dark);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.course-card.featured:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(255, 144, 0, 0.1);
}

.course-header {
    margin-bottom: 2rem;
}

.course-title {
    font-size: 1.8rem;
    color: var(--text-color);
    margin-bottom: 0.8rem;
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}

.course-category {
    color: var(--text-secondary);
}

.course-subtitle {
    color: var(--text-secondary);
    font-size: 1.2rem;
}

.course-actions {
    display: flex;
    justify-content: center;
}

.details-btn {
    padding: 1.2rem 4rem;
    background-color: var(--primary-color);
    color: var(--text-color);
    border: none;
    border-radius: 4px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 1px;
}

.details-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(255, 144, 0, 0.3);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    z-index: 1000;
    overflow: auto;
}

.modal-content {
    position: relative;
    width: 90%;
    height: 90%;
    margin: 2% auto;
    background-color: var(--background-dark);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    padding-bottom: 80px;
}

.close-btn {
    position: absolute;
    right: 20px;
    top: 10px;
    color: var(--text-color);
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    z-index: 1001;
}

.close-btn:hover {
    color: var(--primary-color);
}

.modal-content iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    .section-title {
        font-size: 2rem;
    }

    .course-title {
        font-size: 1.5rem;
        flex-direction: column;
        gap: 0.3rem;
    }

    .course-subtitle {
        font-size: 1rem;
    }

    .details-btn {
        padding: 0.8rem 2rem;
        font-size: 1rem;
    }

    .modal-content {
        width: 95%;
        height: 95%;
        margin: 2.5% auto;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    .course-card.featured {
        border: 2px solid #fff;
    }

    .details-btn {
        border: 2px solid #fff;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    .course-card.featured:hover,
    .details-btn:hover {
        transform: none;
    }
}

#categories-title,
.section-title,
.course-title .course-category {
    color: #ffffff;
}

.category-card ul li {
    color: #666666;
}

.course-title .course-category {
    color: #ff9000;
}

.feature-text,
.course-subtitle {
    color: #ffffff !important;
}

.category-card {
    position: relative;
    padding-bottom: 80px;  /* 为按钮留出空间 */
}

.category-card .btn {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #ff9000;
    color: #ffffff;
    padding: 12px 30px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    display: inline-block;
}

.category-card .btn:hover {
    background-color: #ff7000;
    transform: translateX(-50%) translateY(-2px);
    box-shadow: 0 4px 15px rgba(255, 144, 0, 0.3);
}

.course-stats,
.footer-section p,
.footer-bottom p,
.courses-header p,
.course-stats span {
    color: #ffffff !important;
}

/* 模态窗口底部订阅栏 */
.modal-subscribe-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.9);
    padding: 1rem 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1002;
}

.subscribe-btn {
    background-color: var(--primary-color);
    color: var(--text-color);
    padding: 1rem 3rem;
    border: none;
    border-radius: 30px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.subscribe-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(255, 144, 0, 0.3);
}