/* Header Banner Styles */
header {
    min-height: 80vh;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    background-image: url("../assets/course-banner.jpeg");
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    position: relative;
}

header::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(13, 17, 23, 0.9) 0%,
        rgba(13, 17, 23, 0.7) 100%
    );
}

.header-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    padding: 0 2rem;
}

.header-text h1 {
    font-family: "Poppins", sans-serif;
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 900;
    margin: 0 0 1.5rem 0;
    color: var(--white);
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.header-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.3rem);
    line-height: 1.6;
    color: var(--slate);
    margin: 0;
    max-width: 600px;
    margin: 0 auto;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    color: var(--teal);
    font-size: 1.5rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* Main Content Layout */
main {
    background-color: var(--dark-navy);
    padding-top: 4rem;
    padding-bottom: 6rem;
}

main .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Section Styles */
.categories-section,
.featured-courses-section,
.all-courses-section,
.cta-section {
    margin-bottom: 6rem;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease forwards;
}

.categories-section {
    animation-delay: 0.2s;
}
.featured-courses-section {
    animation-delay: 0.4s;
}
.all-courses-section {
    animation-delay: 0.6s;
}
.cta-section {
    animation-delay: 0.8s;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-header {
    display: flex;
    gap: 3rem;
    align-items: flex-start;
    margin-bottom: 3rem;
}

.section-icon {
    flex-shrink: 0;
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--teal), var(--light-navy));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--white);
    box-shadow: 0 10px 30px -10px var(--navy-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.section-icon:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px -10px var(--navy-shadow);
}

.section-content {
    flex: 1;
}

.section-content h2 {
    font-family: "Poppins", sans-serif;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    color: var(--light-slate);
    margin: 0 0 1rem 0;
    letter-spacing: -0.02em;
}

.section-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--slate);
    margin: 0;
}

/* Course Categories */
.categories-section {
    margin-bottom: 6rem;
    text-align: center;
}

.categories-grid {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.categories-content {
    margin-top: 2rem;
}

.no-content-placeholder {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--light-navy);
    border-radius: 16px;
    border: 2px dashed rgba(0, 245, 212, 0.2);
    transition: all 0.3s ease;
}

.no-content-placeholder:hover {
    border-color: rgba(0, 245, 212, 0.4);
    transform: translateY(-2px);
}

.placeholder-icon {
    margin-bottom: 1.5rem;
}

.placeholder-icon i {
    font-size: 4rem;
    color: var(--teal);
    opacity: 0.6;
}

.no-content-placeholder h3 {
    font-family: "Poppins", sans-serif;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--light-slate);
    margin: 0 0 1rem 0;
}

.no-content-placeholder p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--slate);
    margin: 0;
    max-width: 500px;
    margin: 0 auto;
}

.category-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--light-navy);
    border: 2px solid transparent;
    border-radius: 25px;
    color: var(--slate);
    font-family: "Poppins", sans-serif;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.category-btn:hover {
    background: rgba(0, 245, 212, 0.1);
    border-color: var(--teal);
    color: var(--teal);
    transform: translateY(-2px);
}

.category-btn.active {
    background: var(--teal);
    color: var(--dark-navy);
    border-color: var(--teal);
}

.category-btn.active i {
    color: var(--dark-navy);
}

/* Course Cards */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.course-card {
    background: var(--light-navy);
    border-radius: 16px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    border-top: 3px solid transparent;
    border: 1px solid rgba(0, 245, 212, 0.1);
    box-shadow: 0 4px 20px -10px var(--navy-shadow);
}

.course-card.featured {
    border-top-color: var(--teal);
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px -15px var(--navy-shadow);
}

.course-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--teal);
    color: var(--dark-navy);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    z-index: 2;
}

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

.course-image {
    position: relative;
    height: 200px;
    background: linear-gradient(135deg, var(--light-navy), var(--dark-navy));
    overflow: hidden;
}

.course-image::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("../assets/course-banner.jpeg") center/cover;
    opacity: 1;
}

.course-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 245, 212, 0.1);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.course-card:hover .course-overlay {
    opacity: 1;
}

.course-overlay i {
    font-size: 3rem;
    color: var(--teal);
    transform: scale(0.8);
    transition: transform 0.3s ease;
}

.course-card:hover .course-overlay i {
    transform: scale(1);
}

.course-content {
    padding: 2rem;
}

.course-category {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--teal);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.course-category i {
    font-size: 1rem;
}

.course-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--light-slate);
    margin: 0 0 1rem 0;
    line-height: 1.3;
}

.course-description {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--slate);
    margin-bottom: 1.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-details {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--slate);
}

.detail-item i {
    color: var(--teal);
    font-size: 0.85rem;
}

.course-instructor {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(204, 214, 246, 0.1);
}

.instructor-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.instructor-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    overflow: hidden;
    border: 2px solid var(--teal);
}

.instructor-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.instructor-details h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--light-slate);
    margin: 0 0 0.25rem 0;
}

.instructor-details span {
    font-size: 0.85rem;
    color: var(--slate);
}

.course-price .price {
    display: inline-block;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--white);
    background: linear-gradient(135deg, var(--teal), var(--light-navy));
    padding: 0.5rem 1rem;
    border-radius: 25px;
    border: 2px solid var(--teal);
    box-shadow: 0 4px 15px -5px var(--navy-shadow);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.course-price .price::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    transition: left 0.5s ease;
}

.course-card:hover .course-price .price {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px -5px var(--navy-shadow);
}

.course-card:hover .course-price .price::before {
    left: 100%;
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, var(--light-navy), var(--dark-navy));
    border-radius: 20px;
    padding: 4rem 3rem;
    text-align: center;
    border: 1px solid rgba(0, 245, 212, 0.1);
}

.cta-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.cta-content .section-icon {
    margin: 0;
}

.cta-content h2 {
    text-align: center;
    font-size: clamp(2rem, 5vw, 2.5rem);
    margin-bottom: 1rem;
}

.cta-content p {
    text-align: center;
    max-width: 600px;
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.btn-primary,
.btn-secondary {
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    font-family: "Open Sans", sans-serif;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--teal);
    color: var(--dark-navy);
    border: 2px solid var(--teal);
}

.btn-primary:hover {
    background: transparent;
    color: var(--teal);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px -10px var(--navy-shadow);
}

.btn-secondary {
    background: transparent;
    color: var(--teal);
    border: 2px solid var(--teal);
}

.btn-secondary:hover {
    background: var(--teal);
    color: var(--dark-navy);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px -10px var(--navy-shadow);
}

/* Responsive Design */
@media (max-width: 768px) {
    .section-header {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }

    .section-icon {
        margin: 0 auto;
    }

    .courses-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .categories-grid {
        justify-content: center;
    }

    .category-btn {
        flex: 1 1 calc(50% - 0.5rem);
        min-width: 150px;
        justify-content: center;
    }

    .course-details {
        justify-content: center;
    }

    .course-instructor {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .cta-section {
        padding: 3rem 2rem;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }

    main .container {
        padding: 0 1rem;
    }
}

@media (max-width: 480px) {
    .header-content {
        padding: 0 1rem;
    }

    .course-content {
        padding: 1.5rem;
    }

    .category-btn {
        font-size: 0.9rem;
        padding: 0.75rem 1rem;
    }

    .cta-section {
        padding: 2rem 1rem;
    }

    .course-details {
        gap: 0.5rem;
    }

    .detail-item {
        font-size: 0.85rem;
    }
}

/* Filter Animation */
.course-card {
    transition: all 0.5s ease;
}

.course-card.hidden {
    opacity: 0;
    transform: scale(0.8);
    position: absolute;
    pointer-events: none;
}

.course-card.visible {
    opacity: 1;
    transform: scale(1);
    position: relative;
    pointer-events: all;
}

/* Footer Styles */
footer {
    background: linear-gradient(135deg, var(--dark-navy), var(--light-navy));
    border-top: 1px solid rgba(0, 245, 212, 0.1);
    margin-top: 4rem;
}

footer .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
    padding: 4rem 0 2rem;
}

.footer-section h4 {
    font-family: "Poppins", sans-serif;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--teal);
    margin: 0 0 1.5rem 0;
    position: relative;
}

.footer-section h4::after {
    content: "";
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--teal);
}

.footer-logo img {
    width: 60px;
    height: auto;
    margin-bottom: 1rem;
    border-radius: 50%;
    border: 2px solid var(--teal);
}

.footer-logo h3 {
    font-family: "Poppins", sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--light-slate);
    margin: 0 0 0.5rem 0;
}

.footer-logo p {
    color: var(--teal);
    font-size: 0.9rem;
    margin: 0 0 1.5rem 0;
}

.footer-description p {
    color: var(--slate);
    line-height: 1.6;
    font-size: 0.95rem;
    margin: 0;
}

.footer-links-simple {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links-simple li {
    margin-bottom: 0.8rem;
}

.footer-links-simple li a {
    color: var(--slate);
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 0.95rem;
}

.footer-links-simple li a:hover {
    color: var(--teal);
}

.footer-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-group {
    margin-bottom: 1.5rem;
}

.nav-group:last-child {
    margin-bottom: 0;
}

.nav-group h5 {
    font-family: "Poppins", sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--teal);
    margin: 0 0 0.8rem 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-nav ul li {
    margin-bottom: 0.6rem;
}

.footer-nav ul li a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--slate);
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.footer-nav ul li a:hover {
    color: var(--teal);
    transform: translateX(5px);
}

.footer-nav ul li a i {
    font-size: 0.9rem;
    color: var(--teal);
    width: 20px;
    text-align: center;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    background: rgba(0, 245, 212, 0.1);
    border: 2px solid transparent;
    border-radius: 50%;
    color: var(--teal);
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 1.1rem;
}

.social-links a:hover {
    background: var(--teal);
    color: var(--dark-navy);
    transform: translateY(-3px);
    box-shadow: 0 10px 25px -10px var(--navy-shadow);
}

.contact-info p {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--slate);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.contact-info p i {
    color: var(--teal);
    font-size: 0.9rem;
    width: 20px;
}

.footer-divider {
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(0, 245, 212, 0.3),
        transparent
    );
    margin: 2rem 0;
}

.footer-bottom {
    padding: 2rem 0;
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-bottom-content p {
    color: var(--slate);
    font-size: 0.9rem;
    margin: 0;
}

.footer-bottom-links {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.footer-bottom-links a {
    color: var(--slate);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.footer-bottom-links a:hover {
    color: var(--teal);
}

/* Responsive Footer */
@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .footer-section h4::after {
        left: 50%;
        transform: translateX(-50%);
    }

    .social-links {
        justify-content: center;
    }

    .footer-bottom-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-bottom-links {
        justify-content: center;
    }

    footer .container {
        padding: 0 1rem;
    }
}

@media (max-width: 480px) {
    .footer-content {
        padding: 3rem 0 1.5rem;
    }

    .social-links a {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .footer-bottom {
        padding: 1.5rem 0;
    }
}