@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@300..700&display=swap');
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Fira Code', monospace;
}
:root {
    --background-color: #e0e4e9;
    --main-background: #ffffff;
    --text-color: #000000;
    --title-color: #0066ff;
    --card-background: #80adf1;
    --card-border: #000000;
    --card-hover-bg: #000000;
    --card-hover-text: #0066ff;
}
[data-theme="dark"] {
    --background-color: #1a1a1a;
    --main-background: #2d2d2d;
    --text-color: #ffffff;
    --title-color: #4d94ff;
    --card-background: #404040;
    --card-border: #ffffff;
    --card-hover-bg: #ffffff;
    --card-hover-text: #0066ff;
}
/* Dark mode toggle styles */
.theme-switch-wrapper {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    align-items: center;
    z-index: 100;
}

.theme-switch {
    display: inline-block;
    height: 34px;
    position: relative;
    width: 60px;
}

.theme-switch input {
    display: none;
}

.slider {
    background-color: #ccc;
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    background-color: #fff;
    bottom: 4px;
    content: "";
    height: 26px;
    left: 4px;
    position: absolute;
    transition: .4s;
    width: 26px;
    border-radius: 50%;
}

/* Sun and Moon symbols */
.slider:after {
    content: "☀️";
    font-size: 16px;
    position: absolute;
    top: 8px;
    left: 8px;
    transition: .4s;
}

input:checked + .slider:after {
    content: "🌙";
    left: 36px;
}

input:checked + .slider {
    background-color: #0066ff;
}

input:checked + .slider:before {
    transform: translateX(26px);
}
/*dark mode done sir */
body{
    background-color: var(--background-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    margin: 0;
    padding: 0;
}
#container{
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1 0 auto;
    width: 100%;
    padding: 20px;
    box-sizing: border-box;
}
#main{
    text-align: center;
    background-color: var(--main-background);
    margin-top: 60px;
    padding: 40px;
    width: 950px;
    border-radius: 20px;
    box-shadow: 0px 10px 30px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}
#main::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.3s ease;
}
#main:hover::before {
    opacity: 1;
}
#title{
    color: var(--title-color);
    font-size: 2rem;
    font-weight: 900;
    letter-spacing: 1px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    position: relative;
    display: inline-block;
}
#title::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 3px;
    bottom: -5px;
    left: 0;
    background: linear-gradient(to right, var(--title-color), transparent);
    border-radius: 3px;
}
#subtitle{
    margin-top: 40px;
    font-size: 1.2rem;
    font-weight: 800;
    background: linear-gradient(45deg, var(--title-color), var(--text-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
#subtitle2{
    margin-top: 20px;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.6;
    letter-spacing: 0.3px;
    color: var(--text-color);
    opacity: 0.9;
    max-width: 80%;
    margin-left: auto;
    margin-right: auto;
}
#years{
    display: flex;
    justify-content: space-around;
    align-items: center;
}
#sems {
    display: flex;
    justify-content: space-around;
    align-items: center;
    margin-top: 20px;
}
#fy, #sy, #fs, #ss, .sub, #thirdsem, #foursem {
    height: 300px;
    width: 250px;
    padding-top: 132px;
    margin-top: 70px;
    background-color: var(--card-background);
    border-radius: 20px;
    border: 2px solid var(--card-border);
    box-shadow: 0px 10px 30px rgba(0, 0, 0, 0.2);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}
#fy::before, #sy::before, #fs::before, #ss::before, .sub::before ,#thirdsem::before, #foursem::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}
#fy:hover::before, #sy:hover::before, #fs:hover::before, #ss:hover::before, .sub:hover::before #thirdsem:hover::before, #foursem:hover::before {
    transform: translateX(100%);
}
#fy:hover, #sy:hover, #fs:hover, #ss:hover, .sub:hover ,#thirdsem:hover, #foursem:hover {
    background-color: var(--card-hover-bg);
    color: var(--card-hover-text);
    box-shadow: 0px 15px 35px rgba(0, 0, 0, 0.3);
    transform: translateY(-10px) scale(1.02);
}
#subs {
    display: flex;
    justify-content: space-around;
    align-items: center;
    margin-top: 20px;
    flex-wrap: wrap;
    gap: 20px;
}
#foot{
    margin-top: auto;
    display: flex;
    align-items: center;
    justify-content: space-around;
    padding: 20px;
    background: linear-gradient(to right, var(--card-background), var(--main-background));
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    width: 100%;
    box-sizing: border-box;
    flex-wrap: wrap;
    gap: 15px;
}
#foot a {
    transition: color 0.3s ease, transform 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
#foot a:hover {
    color: var(--title-color);
    transform: translateY(-2px);
}
#foot svg {
    transition: transform 0.3s ease;
}
#foot a:hover svg {
    transform: rotate(15deg);
}

@media screen and (max-width: 1024px) {
    #main {
        width: 90%;
        margin-top: 50px;
        padding: 30px;
    }

    #fy, #sy, #fs, #ss, .sub, #thirdsem, #foursem {
        height: 280px;
        width: 220px;
        padding-top: 120px;
    }

    #title {
        font-size: 1.8rem;
    }

    #subtitle {
        font-size: 1.1rem;
    }
}

@media screen and (max-width: 768px) {
    #container {
        padding: 10px;
    }
    
    #main {
        width: 95%;
        margin-top: 40px;
        padding: 20px;
    }

    #years, #sems {
        flex-direction: column;
        gap: 20px;
    }

    #fy, #sy, #fs, #ss, .sub, #thirdsem, #foursem {
        height: 250px;
        width: 200px;
        padding-top: 100px;
        margin-top: 20px;
    }

    #title {
        font-size: 1.6rem;
    }

    #subtitle {
        font-size: 1rem;
        margin-top: 30px;
    }

    #subtitle2 {
        font-size: 0.9rem;
        max-width: 95%;
    }
    
    #foot {
        flex-direction: column;
        text-align: center;
        padding: 15px;
        gap: 20px;
    }
    
    #foot a {
        width: 100%;
        justify-content: center;
    }

    .theme-switch-wrapper {
        top: 10px;
        right: 10px;
    }
}

@media screen and (max-width: 480px) {
    #main {
        margin-top: 30px;
        padding: 15px;
        width: 98%;
    }

    #fy, #sy, #fs, #ss, .sub, #thirdsem, #foursem {
        height: 220px;
        width: 180px;
        padding-top: 90px;
        margin-top: 15px;
    }

    #title {
        font-size: 1.4rem;
    }

    #subtitle {
        font-size: 0.9rem;
        margin-top: 25px;
    }

    #subtitle2 {
        font-size: 0.85rem;
        margin-top: 15px;
    }
    
    #foot {
        padding: 10px;
        gap: 15px;
    }

    .theme-switch-wrapper {
        transform: scale(0.9);
    }
}

/* For very small devices */
@media screen and (max-width: 360px) {
    #main {
        padding: 10px;
    }

    #fy, #sy, #fs, #ss, .sub, #thirdsem, #foursem {
        height: 200px;
        width: 160px;
        padding-top: 80px;
    }

    #title {
        font-size: 1.2rem;
    }

    #subtitle {
        font-size: 0.85rem;
    }

    #subtitle2 {
        font-size: 0.8rem;
    }

    .theme-switch-wrapper {
        transform: scale(0.8);
    }
}

/* For landscape orientation on mobile devices */
@media screen and (max-height: 500px) and (orientation: landscape) {
    #main {
        margin-top: 20px;
        padding: 15px;
    }

    #fy, #sy, #fs, #ss, .sub, #thirdsem, #foursem {
        height: 180px;
        padding-top: 70px;
        margin-top: 10px;
    }

    #years, #sems {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }
}