/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800&family=Poppins:wght@300;400;500;600;700&family=Montserrat:wght@400;500;600;700&display=swap');

:root {
    --heading-font: 'Nunito', sans-serif;
    --body-font: 'Poppins', sans-serif;
    --accent-font: 'Montserrat', sans-serif;
}

/* Course Image */
.course-image {
    width: 100%;
    height: 180px;
    overflow: hidden;
    margin-bottom: 15px;
    border-radius: 8px;
    background: var(--light-gray);
}

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

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

@media (max-width: 823px) {
    header nav {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 0;
        background: var(--white);
        overflow: hidden;
        transition: height 0.3s ease, opacity 0.3s ease;
        opacity: 0;
        z-index: 999;
    }

    header nav.active {
        display: block;
        height: 100vh;
        opacity: 1;
        padding: 80px 20px 20px;
    }

    header nav ul {
        flex-direction: column;
        align-items: center;
    }

    header nav ul li {
        margin: 15px 0;
    }

    header nav ul li a {
        font-size: 1.2rem;
        color: var(--primary-black);
    }
}

@media (max-width: 768px) {
    nav ul li a {
        font-size: 1.1rem;
    }
}

/* Toggle Buttons */
.student-toggle {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    perspective: 1000px; 
}

.toggle-btn {
    padding: 15px 32px;
    border-radius: 30px;
    background: rgba(255, 255, 255, 0.9); 
    border: 2px solid transparent; 
    color: var(--primary-black);
    font-weight: 600; 
    font-size: 1.1rem; 
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1); 
    position: relative; 
    overflow: hidden; 
    box-shadow: 0 10px 20px rgba(107, 55, 160, 0.1); 
    backdrop-filter: blur(10px); 
}

.toggle-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--primary-purple);
    opacity: 0;
    transition: opacity 0.4s ease; 
    z-index: -1;
}

.toggle-btn:hover,
.toggle-btn.active {
    transform: translateY(-5px); 
    box-shadow: 0 15px 30px rgba(107, 55, 160, 0.2); 
    color: var(--white);
}

.toggle-btn:hover::before,
.toggle-btn.active::before {
    opacity: 1; 
}

/* Course Hero Section */

.course-hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.course-badge {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 600;
    margin-bottom: 20px;
    background: rgba(255, 255, 255, 0.2);
}

.course-hero h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.course-subtitle {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.course-meta {
    display: flex;
    justify-content: center;
    gap: 30px;
}

.course-meta span {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--accent-font);
}

/* Courses by Age Group Styles */
.courses-by-age {
    padding: 30px 0;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
}

.grade-filters {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 20px 0 0px;
    flex-wrap: wrap;
    perspective: 1000px;
}

.grade-filter, .reset-courses-btn {
    padding: 15px 32px;
    border-radius: 30px;
    background: rgba(255, 255, 255, 0.9);
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    border: none;
}

.grade-filter::before, .reset-courses-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--primary-purple);
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: -1;
}

.grade-filter:hover,
.grade-filter.active,
.reset-courses-btn:hover {
    transform: translateY(-5px);
    color: var(--white);
}

.grade-filter:hover::before,
.grade-filter.active::before,
.reset-courses-btn:hover::before {
    opacity: 1;
}

.reset-courses-btn {
    background: rgba(255, 255, 255, 0.8);
    color: var(--primary-purple);
    margin-left: 10px;
}

.section-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 30px;
    color: #666;
    font-size: 1.1rem;
    line-height: 1.6;
}

.age-groups {
    display: flex;
    flex-direction: column;
    gap: 40px;
    opacity: 1;
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.age-group {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(107, 55, 160, 0.1);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    backdrop-filter: blur(10px);
    transform-origin: center;
    z-index: 2;
    width: 100%;
}

.age-group-header {
    text-align: center;
    margin-bottom: 30px;
    position: relative;
    padding-bottom: 20px;
}

.age-group-header h3 {
    font-size: 1.8rem;
    color: var(--primary-purple);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 30px;
    position: relative;
}

.course-card {
    position: relative;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 25px;
    padding: 35px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08),
                inset 0 -4px 0 rgba(107, 55, 160, 0.4);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    overflow: hidden;
    z-index: 1;
    opacity: 1;
    transform: scale(1);
    height: auto;
}

.course-card.hidden {
    opacity: 0;
    transform: scale(0.95);
    height: 0;
    margin: 0;
    padding: 0;
    overflow: hidden;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.course-card:hover {
    transform: translateY(-15px) scale(1.02);
    box-shadow: 0 30px 60px rgba(107, 55, 160, 0.15),
                inset 0 -4px 0 rgba(107, 55, 160, 0.6);
    border-color: rgba(107, 55, 160, 0.3);
}

.course-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(107, 55, 160, 0.15) 0%,
        rgba(142, 68, 173, 0.15) 50%,
        rgba(107, 55, 160, 0.15) 100%
    );
    opacity: 0;
    transition: opacity 0.5s ease;
    z-index: -1;
}

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

.card-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    padding: 5px 10px;
    border-radius: 10px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.card-badge.foundations { background-color: #43A047; color: var(--light-gray); }
.card-badge.builders { background-color: #17a2b8; color: var(--light-gray); }
.card-badge.mastery { background-color: #D81B60; color: var(--light-gray); }
.card-badge.college { background-color: var(--primary-purple); color: var(--light-gray); }

/* Level Badge Styles */
.level-badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.level-badge.foundations { background-color: #43A047; color: var(--white); }
.level-badge.builders { background-color: #17a2b8; color: var(--white); }
.level-badge.mastery { background-color: #D81B60; color: var(--white); }
.level-badge.college { background-color: var(--primary-purple); color: var(--white); }

.course-icon {
    position: relative;
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-black));
    border-radius: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 10px;
    margin-top: 15px;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 10px 20px rgba(107, 55, 160, 0.2);
}

.course-icon i {
    font-size: 32px;
    transition: all 0.5s ease;
    color: var(--light-gray);
}

.course-card:hover .course-icon {
    transform: rotate(-12deg) scale(1.15);
    box-shadow: 0 15px 30px rgba(107, 55, 160, 0.3);
}

.course-card:hover .course-icon i {
    transform: rotate(12deg) scale(1.1);
}

.course-card h2 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--dark-text);
}

.course-features {
    margin: 25px 0;
    padding: 0;
    list-style: none;
}

.course-features li {
    font-family: var(--accent-font);
    margin-bottom: 18px;
    padding-left: 35px;
    position: relative;
    color: var(--dark-text);
    font-size: 1.05rem;
    transition: all 0.4s ease;
}

.course-features li i {
    position: absolute;
    left: 0;
    top: 4px;
    color: var(--primary-purple);
    font-size: 1.2rem;
    transition: all 0.4s ease;
}

.course-card:hover .course-features li {
    transform: translateX(8px);
    color: #333;
}

.course-card:hover .course-features li i {
    transform: scale(1.2) rotate(10deg);
    color: #43A047;
}

.course-meta {
    margin-bottom: 20px;
    color: #666;
}

.btn-secondary {
    font-family: var(--accent-font);
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-black));
    border: none;
    padding: 16px 32px;
    border-radius: 30px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    display: inline-block;
    text-align: center;
    width: 100%;
    margin-top: 25px;
    box-shadow: 0 10px 20px rgba(107, 55, 160, 0.2);
}

.btn-secondary::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        45deg,
        transparent 0%,
        rgba(255, 255, 255, 0.3) 50%,
        transparent 100%
    );
    transform: rotate(45deg) translateY(-100%);
    transition: transform 0.8s ease;
}

.btn-secondary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(107, 55, 160, 0.3);
    letter-spacing: 2px;
}

.btn-secondary:hover::before {
    transform: rotate(45deg) translateY(100%);
}

/* Responsive Design */
@media (max-width: 992px) {
    .age-group {
        padding: 30px;
    }

    .courses-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .age-groups {
        gap: 30px;
        padding: 15px;
    }

    .age-group {
        padding: 25px;
    }

    .age-group-header h3 {
        font-size: 1.5rem;
    }
}

@media (max-width: 576px) {
    .age-groups {
        gap: 20px;
        padding: 10px;
    }

    .age-group {
        padding: 20px;
    }

    .age-group-header h3 {
        font-size: 1.3rem;
    }

    .course-hero {
        padding: 40px 0;
        margin-top: 50px;
    }

    .course-hero h1 {
        font-size: 1.5rem;
    }

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

    .course-badge {
        padding: 6px 12px;
        font-size: 0.85rem;
    }

    .student-toggle {
        gap: 10px;
    }

    .toggle-btn, .grade-filter, .reset-courses-btn {
        padding: 8px 16px;
        font-size: 0.85rem;
        width: 100%;
        max-width: 200px;
    }

    .courses-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .course-card {
        padding: 20px;
    }

    .course-card h2 {
        font-size: 1.2rem;
    }

    .course-features li {
        font-size: 0.9rem;
    }

    .btn-secondary {
        padding: 10px 20px;
        font-size: 0.85rem;
    }

    .section-intro {
        font-size: 1rem;
        padding: 0 15px;
    }
}

@media (max-width: 768px) {
    .course-hero {
        padding: 50px 0;
        margin-top: 60px;
        height: auto;
        min-height: auto;
    }

    .course-detail-hero {
        padding: 50px 0;
        margin-top: 60px;
        height: auto;
        min-height: auto;
    }

    .course-hero h1 {
        font-size: 1.8rem;
    }

    .course-subtitle {
        font-size: 0.95rem;
    }

    .course-meta {
        flex-direction: column;
        gap: 15px;
        align-items: center;
    }

    .student-toggle {
        gap: 15px;
    }

    .toggle-btn, .grade-filter, .reset-courses-btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }

    .grade-filters {
        gap: 10px;
    }

    .courses-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 15px;
    }

    .course-card {
        padding: 25px;
    }

    .course-card h2 {
        font-size: 1.3rem;
    }

    .btn-secondary {
        padding: 12px 24px;
        font-size: 0.9rem;
    }
}

@media (max-width: 992px) {
    .course-hero {
        padding: 60px 0;
        margin-top: 70px;
    }

    .course-hero h1 {
        font-size: 2rem;
    }

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

    .toggle-btn, .grade-filter, .reset-courses-btn {
        padding: 12px 24px;
        font-size: 1rem;
    }
}