@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800;900&display=swap');

:root {
    --body-bg: #E5E5EA;
    --container-bg: #F2F2F7;
    --text-color: #060606;
    --input-bg: #E5E5EA;
    --input-border: #d2d2d2;
    --input-focus-border: #007BFE;
    --button-bg: #007BFE;
    --button-text: white;
    --button-hover-bg: #0067d5;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --toggle-btn-bg: #F2F2F7;
    --toggle-btn-color: white;
    --toggle-btn-hover-bg: #F2F2F7;
    --input-focus-shadow: #007BFE; 
}

body.dark-mode {
    --body-bg: #1c1c1c;
    --container-bg: #2C2C2E;
    --text-color: #E0E0E0;
    --input-bg: #2C2C2C;
    --input-border: #444444;
    --input-focus-border: #0B84FE;
    --button-bg: #0B84FE;
    --button-text: #FFFFFF;
    --button-hover-bg: #3298ff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --toggle-btn-bg: #2C2C2C;
    --toggle-btn-color: #E0E0E0;
    --toggle-btn-hover-bg: #3d3d3d;
    --input-focus-shadow: #007BFE;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.class {
    font-weight: 600;
    font-size: 17px;
    color: var(--text-color);
}

.percentage {
    font-weight: 600;
    font-size: 17px;
    color: var(--text-color);
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--body-bg);
    display: flex;
    color: var(--text-color);
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    padding: 10px;
    padding-top: 20px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    background-color: var(--container-bg);
    padding: 24px;
    border-radius: 15px;
    box-shadow: rgba(0, 0, 0, 0.1) 0px 0px 5px 0px,rgba(0, 0, 0, 0.1) 0px 0px 1px 0px;
    text-align: center;
    width: 100%;
    max-width: 462px;
    margin-bottom: 12px;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

h1 {
    color: var(--text-color);
    font-size: 24px;
    margin-bottom: 20px;
}

img {
    max-width: 100px;
    margin-bottom: 10px;
}

input[type="number"] {
    width: 100%;
    padding: 10px;
    margin: 20px 0 15px 0;
    background-color: var(--input-bg);
    border: 2px solid var(--input-border);
    color: var(--text-color);
    border-radius: 8px;
    text-align: center;
    font-size: 16px;
    transition: border-color 0.3s ease, background-color 0.3s ease, color 0.3s ease;
}

input[type="number"]:focus {
    border-color: var(--input-focus-border);
    outline: none;
}

input[type="number"]::placeholder {
    color: var(--text-color);
    opacity: 0.7;
}

body.dark-mode input[type="number"]::placeholder {
    color: var(--text-color);
    opacity: 0.6;
}

button {
    background-color: var(--button-bg);
    color: var(--button-text);
    padding: 12px;
    border: none;
    border-radius: 8px;
    width: 100%;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

button:hover {
    background-color: var(--button-hover-bg);
}

#results {
    text-align: center;
    color: var(--text-color);
    font-size: 15px;
}

h3 {
    padding-top: 17px;
    padding-bottom: 5px;
    font-weight: 700;
    color: var(--text-color);
}

input, button {
    font-family: 'Poppins', sans-serif;
    font-size: 15px;
    font-weight: 500;
}

footer {
    font-size: 14px;
    text-align: center;
    max-width: fit-content;
    margin: 2px auto;
    padding: 1px;
    color: var(--text-color);
}

footer a {
    font-weight: 500;
    color: var(--button-bg);
    text-decoration: none;
}

body.dark-mode footer a {
    color: var(--input-focus-border);
}

footer a:hover {
    text-decoration: underline;
}

#theme-toggle-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--toggle-btn-bg);
    color: var(--toggle-btn-color);
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 24px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: rgba(0, 0, 0, 0.1) 0px 0px 5px 0px,rgba(0, 0, 0, 0.1) 0px 0px 1px 0px;
    transition: background-color 0.3s ease, color 0.3s ease, transform 0.2s ease;
    z-index: 1000;
}

#theme-toggle-btn:hover {
    background-color: var(--toggle-btn-hover-bg);
    transform: translateY(-2px);
}

#theme-toggle-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--input-focus-shadow);
}

body.dark-mode #theme-toggle-btn {
    box-shadow: rgba(0, 0, 0, 0.3) 0px 0px 5px 0px,rgba(0, 0, 0, 0.3) 0px 0px 1px 0px;
}

body.dark-mode #theme-toggle-btn:hover {
    outline: none;
    box-shadow: 0 0 0 3px var(--input-focus-shadow);
}

.error-message {
    color: red;
    font-weight: 500; /* Or other styling */
}

@media (max-width: 768px) {
    h1 {
        font-size: 20px;
    }

    input[type="number"], button {
        font-size: 14px;
    }

    img {
        max-width: 80px;
    }

    .container {
        padding: 15px;
    }

    .class {
        font-size: 15px;
        font-weight: 600;
    }

    .percentage {
        font-size: 15px;
        font-weight: 600;
    }

    .result {
        font-size: 14px;
        color: var(--text-color);
    }
}