:root {
    /* Base font sizes (for screens < 1800px) */
    --font-size-h1: 2.5rem; 
    --font-size-h2: 2rem;
    --font-size-h3: 1.5rem;
    --font-size-subtext: 1.25rem;
    --font-size-body: 1rem;
    --font-size-small: 0.875rem;

    /* Medium screens (1800px - 2500px) */
    --font-size-h1-medium: 3.5rem;  /* +1rem from base */
    --font-size-h2-medium: 2.75rem; /* +0.75rem */
    --font-size-h3-medium: 2rem;    /* +0.5rem */
    --font-size-subtext-medium: 1.5rem;
    --font-size-body-medium: 1.125rem;
    --font-size-small-medium: 1rem;

    /* Big screens (2500px - 3100px) */
    --font-size-h1-big: 4.5rem;     /* +1rem from medium */
    --font-size-h2-big: 3.5rem;     /* +0.75rem */
    --font-size-h3-big: 2.5rem;     /* +0.5rem */
    --font-size-subtext-big: 1.75rem;
    --font-size-body-big: 1.25rem;
    --font-size-small-big: 1.125rem;

    /* Giant screens (3100px+) */
    --font-size-h1-giant: 5.5rem;   /* +1rem from big */
    --font-size-h2-giant: 4.25rem;  /* +0.75rem */
    --font-size-h3-giant: 3rem;     /* +0.5rem */
    --font-size-subtext-giant: 2rem;
    --font-size-body-giant: 1.375rem;
    --font-size-small-giant: 1.25rem;

    /* Tablet/Mobile (keep existing) */
    --font-size-h1-tablet: 2rem;
    --font-size-h1-mobile: 1.75rem;
    --font-size-h2-tablet: 1.75rem;
    --font-size-h2-mobile: 1.5rem;
    --font-size-h3-tablet: 1.375rem;
    --font-size-h3-mobile: 1.25rem;
    --font-size-subtext-tablet: 1.125rem;
    --font-size-subtext-mobile: 1rem;
    --font-size-body-tablet: 0.9375rem;
    --font-size-body-mobile: 0.875rem;
    --font-size-small-tablet: 0.8125rem;
    --font-size-small-mobile: 0.75rem;
}
body {
    margin: 0;
    font-family: Arial, sans-serif;
    overflow-x: hidden;
    background-color: #ffffff;
}

/* Layout */
.layout {
    display: flex;
}

/* Sidebar */
.sidebar {
    flex: 0 0 200px; 
    background-color: #fff;
    padding: 1rem;
    height: calc(100vh - 2rem);
    box-sizing: border-box;
    position: sticky;
    top: 2rem;
    box-shadow: 4px 4px 8px rgba(0, 0, 0, 0.1), 0 8px 8px rgba(0, 0, 0, 0.1); 
    border-radius: 0 10px 10px 0;
    margin: 1rem 0.5 1rem -1rem; 
    border-top: none;
    transform: translateX(0); 
    transition: transform 0.3s ease; 
}
.sidebar h3 {
    margin-bottom: 1rem;
    color: #1c3a82;
    font-size: 1.2rem;
}

.sidebar h4{
    margin-bottom: 1rem;
    font-size: var(--font-size-body);
    color: #272727;
}

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

.sidebar li {
    margin: 0.5rem 0;
    font-size: var(--font-size-small);
}

.sidebar a { 
    display: block; 
    padding: 0.2rem; 
    text-decoration: none;
    color: inherit; 
    transition: background-color 0.3s ease; 
    border-bottom: 1px solid #f0f0f0;
}

.sidebar a:hover {
    color:#62a8d0;
    border-radius: 5px; 
    text-decoration: none; 
    transform: translateY(-3px);
}

/* Content */

.content {
    display: flex;
    padding: 2rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    justify-content: center;
}

.cards-container {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    justify-content: center;
}

.course-card {
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    width: 300px;
    height: 400px;
    text-align: center;
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

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

.course-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.course-card h3 {
    margin: 0.5rem 0;
    font-size: var(--font-size-subtext);
    color: #333;
    height: 2.5rem; 
    line-height: 1.25rem; 
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.course-card p {
    font-size: var(--font-size-small);
    color: #666;
    height: 3rem; 
    line-height: 1.5rem; 
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    margin: 0 1rem; 
}

.course-card span {
    font-weight: bold;
    color: #1c3a82;
    display: block;
    margin: 0.5rem 0;
}

.course-btn {
    background-color: #62a8d0;
    color: white;
    border: none;
    padding: 0.5rem;
    margin: 1rem;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    text-decoration: none;
}

.course-btn:hover {
    background-color: #1c3a82;
}

.sidebar #programme-landing-sidebar-close {
    font-size: 0.8rem;
    cursor: pointer;
    position: absolute;
    top: 0.5rem; 
    right: 0.5rem;
    display: none;
}

.sidebar-toggle {
    position: fixed; 
    top: 5.7rem; 
    left: 1rem; 
    font-size: 1.5rem;
    margin: 0;
    padding: 0.4rem; 
    display: none;
}

.mobile-sidebar{
    display: none;
    font-size: var(--font-size-body);
}

.ms-heading{
    display: none;
    font-size: var(--font-size-subtext);
}

/* Responsive Design */
@media screen and (min-width:3100px) {
    /* Sidebar */
        .sidebar {
            flex: 0 0 650px; 
            padding: 3rem;
            top: 4rem;
            box-shadow: 16px 16px 24px rgba(0, 0, 0, 0.1), 0 8px 8px rgba(0, 0, 0, 0.1); 
            border-radius: 0 30px 30px 0;
            margin: 3rem 1.5 3rem -3rem; 
        }
        .sidebar h3 {
            margin-bottom: 3rem;
            font-size: var(--font-size-body-giant);
        }

        .sidebar h4{
            margin-bottom: 3rem;
            font-size: var(--font-size-small-giant);
        }

        .sidebar li {
            margin: 1.5rem 0;
            font-size: var(--font-size-small-giant);
        }

        .sidebar a { 
            padding: 1rem; 
        }

        .sidebar a:hover {
            border-radius: 15px; 
            transform: translateY(-8px);
        }
    /* Content */
        .content {
            padding: 6rem;
            gap: 3.5rem;
        }
        
        .cards-container {
            gap: 3.5rem;
        }
        
        .course-card {
            border: 3px solid #ddd;
            border-radius: 38px;
            box-shadow: 0 14px 16px rgba(0, 0, 0, 0.1);
            width: 960px;
            height: 1200px;
        }
        
        .course-card:hover {
            transform: translateY(-15px);
        }
        
        .course-card img {
            height: 500px;
        }
        
        .course-card h3 {
            margin: 4rem 0;
            font-size: var(--font-size-body-giant);
            height: 3rem; 
            line-height: 3.5rem; 
        }
        
        .course-card p {
            font-size: var(--font-size-small-giant);
            height: 5rem; 
            line-height: 3.5rem; 
            margin: 0 3rem; 
        }
        
        .course-card span {
            margin: 1.5rem 0;
            font-size: var(--font-size-small-giant);
        }
        
        .course-btn {
            padding: 1.5rem;
            margin: 3rem;
            border-radius: 25px;
            font-size: var(--font-size-small-giant)
        }
        
}
@media screen and (min-width:2501px) and (max-width:3100px){
    /* Sidebar */
    .sidebar {
        flex: 0 0 575px; 
        padding: 1.63rem;
        top: 4rem;
        box-shadow: 16px 16px 24px rgba(0, 0, 0, 0.1), 0 8px 8px rgba(0, 0, 0, 0.1); 
        border-radius: 0 30px 30px 0;
        margin: 2rem 1 2.5rem -2.5rem; 
    }
    .sidebar h3 {
        margin-bottom: 2.5rem;
        font-size: var(--font-size-body-big);
    }

    .sidebar h4{
        margin-bottom: 3rem;
        font-size: var(--font-size-small-big);
    }

    .sidebar li {
        padding-right:1rem;
        margin: 1.8rem 0;
        font-size: var(--font-size-small-big);
    }

    .sidebar a { 
        padding: 1rem; 
    }

    .sidebar a:hover {
        border-radius: 15px; 
        transform: translateY(-8px);
    }
/* Content */
    .content {
        padding: 6rem;
        gap: 3.5rem;
    }
    
    .cards-container {
        gap: 2.5rem;
    }
    
    .course-card {
        border: 3px solid #ddd;
        border-radius: 38px;
        box-shadow: 0 14px 16px rgba(0, 0, 0, 0.1);
        width: 820px;
        height: 980px;
    }
    
    .course-card:hover {
        transform: translateY(-15px);
    }
    
    .course-card img {
        height: 450px;
    }
    
    .course-card h3 {
        margin: 4.5rem 1rem;
        font-size: var(--font-size-body-big);
        height: 3rem; 
        line-height: 3.5rem; 
    }
    
    .course-card p {
        font-size: var(--font-size-small-big);
        height: 5rem; 
        line-height: 3.5rem; 
        margin: 0 3rem; 
    }
    
    .course-card span {
        margin: 1.5rem 0;
        font-size: var(--font-size-small-big);
    }
    
    .course-btn {
        padding: 1.5rem;
        margin: 3rem;
        border-radius: 25px;
        font-size: var(--font-size-small-big)
    }
}
@media screen and (min-width: 1800px) and (max-width:2500px) {
    .sidebar {
        flex: 0 0 320px; 
        padding: 1.2rem;
        top: 2rem;
        box-shadow: 10px 10px 16px rgba(0, 0, 0, 0.1), 0 8px 8px rgba(0, 0, 0, 0.1); 
        border-radius: 0 20px 20px 0;
        margin: 1.5rem 0.8 1.5rem -1.5rem; 
    }
    .sidebar h3 {
        margin-bottom: 1.5rem;
        font-size: var(--font-size-body-medium);
    }

    .sidebar h4{
        margin-bottom: 1.5rem;
        font-size: var(--font-size-small-medium);
    }

    .sidebar li {
        margin: 1rem 0;
        font-size: var(--font-size-small-medium);
    }

    .sidebar a { 
        padding: 0.5rem; 
    }

    .sidebar a:hover {
        border-radius: 15px; 
        transform: translateY(-5px);
    }
/* Content */
    .content {
        padding: 2.5rem;
        gap: 2rem;
    }
    
    .cards-container {
        gap: 2rem;
    }
    
    .course-card {
        border: 2px solid #ddd;
        border-radius: 18px;
        box-shadow: 0 14px 16px rgba(0, 0, 0, 0.1);
        width: 500px;
        height: 650px;
    }
    
    .course-card:hover {
        transform: translateY(-8px);
    }
    
    .course-card img {
        height: 350px;
    }
    
    .course-card h3 {
        margin: 1.5rem 1rem;
        font-size: var(--font-size-body-medium);
        height: 3rem; 
        line-height: 2rem; 
    }
    
    .course-card p {
        font-size: var(--font-size-small-medium);
        height: 2rem; 
        line-height: 1.5rem; 
        margin: 0 2rem; 
    }
    
    .course-card span {
        margin: 1rem 0;
        font-size: var(--font-size-small-medium);
    }
    
    .course-btn {
        padding: 0.8rem;
        margin: 1.3rem;
        border-radius: 10px;
        font-size: var(--font-size-small-medium)
    }
}
@media screen and (max-width: 1127px) { 
    .layout {
        flex-direction: column;
    }

    .ms-heading{
        display: block;
        color: #1c3a82;
        font-size: 2rem;
    }

    .mobile-sidebar {
        margin-top: -3rem;
        display: flex; 
        flex-wrap: wrap; 
        gap: 1rem;
        justify-content: center; 
        align-items: center; 
        padding: 1.5rem 1rem; 
        width: 100vw; 
        box-sizing: border-box; 
        border-bottom: 1px solid #d4d4d4;

    }

    .mobile-sidebar .toggle-button {
        max-width: 220px; 
        margin: 0.2rem;
        padding: 0.8rem 1.5rem;
        border: none;
        border-radius: 20px;
        font-size: 1.2rem;
        cursor: pointer;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1); 
        transition: transform 0.2s ease, background-color 0.2s ease;
        background-color: #f0f0f5;
        text-align: center; 
    }

    .mobile-sidebar .toggle-button a{
        text-decoration: none;
        color: #1c3a82;
        flex: 1 1 150px; 
    }

    .sidebar {
        position: fixed; 
        transform: translateX(-100%); 
        transition: transform 0.3s ease; 
    }

    .content {
        flex: 1; 
        padding: 1rem;
    }
}

@media screen and (max-width: 600px) { 
    .mobile-sidebar {
        padding: 10px; 
    }
    
}

@media screen and (max-width: 600px) { 
    .mobile-sidebar .toggle-button {
        padding: 8px 12px; 
        margin: 5px 0;
        width: auto;
    }
}

@media (max-width: 768px) {
    .course-card h3 {
        font-size: var(--font-size-subtext-tablet);
    }
    
    .course-card p {
        font-size: var(--font-size-small-tablet);
    }
    .mobile-sidebar .toggle-button{
        font-size: var(--font-size-body-tablet);
    }
    
    .ms-heading{
        font-size: var(--font-size-h2-tablet);
    }
}

@media (max-width: 480px) {
    .course-card h3 {
        font-size: var(--font-size-subtext-mobile);
    }
    
    .course-card p {
        font-size: var(--font-size-small-mobile);
    }
    mobile-sidebar .toggle-button{
        font-size: var(--font-size-body-mobile);
    }
    
    .ms-heading{
        font-size: var(--font-size-h2-mobile);
    }
}