portfolio/styles/themes.css

/* Modern CSS reset and variables */
:root {
    /* Claude dark blue / grey theme */
    --text-colour: #1a202c;
    --primary-colour: #2d3748;
    --secondary-colour: #4a5568;
    --accent-colour: #4299e1;
    --page-background-colour: #f7fafc;
    --text-background-colour: white;
    --text-link-unvisited-colour: #0000EE;
    --text-link-visited-colour: #551A8B;
    --github-calendar-level-0-colour: var(--color-calendar-graph-day-bg);
    --github-calendar-level-1-colour: var(--color-calendar-graph-day-L1-bg);
    --github-calendar-level-2-colour: var(--color-calendar-graph-day-L2-bg);
    --github-calendar-level-3-colour: var(--color-calendar-graph-day-L3-bg);
    --github-calendar-level-4-colour: var(--color-calendar-graph-day-L4-bg);
}
:root[data-theme="purple"] {
    /* Purple theme 
        - https://coolors.co/palette/10002b-240046-3c096c-5a189a-7b2cbf-9d4edd-c77dff-e0aaff
    */
    --text-colour: #10002B; /* very dark */
    --primary-colour: #240046; /* medium dark */
    --secondary-colour: #3C096C; /* dark */
    --accent-colour: #C77DFF; /* light */
    --page-background-colour: #E0AAFF; /* very light */
    --text-background-colour: white;
    /*
    --text-link-unvisited-colour: #0000EE;
    --text-link-visited-colour: #551A8B;
    --github-calendar-level-0-colour: var(--color-calendar-graph-day-bg);
    --github-calendar-level-1-colour: var(--color-calendar-graph-day-L1-bg);
    --github-calendar-level-2-colour: var(--color-calendar-graph-day-L2-bg);
    --github-calendar-level-3-colour: var(--color-calendar-graph-day-L3-bg);
    --github-calendar-level-4-colour: var(--color-calendar-graph-day-L4-bg);
    */
}
:root[data-theme="red"],
:root[data-theme="light"] {
    /* Red theme 
        - https://coolors.co/palette/2b0000-4f0000-740000-980000-b50000-d30000-eb1d1d-f50f0f-ff0000
        - https://coolors.co/palette/9c191b-ac1c1e-bd1f21-d02224-dd2c2f-e35053-e66063-ec8385-f1a7a9-f6cacc
    */
    --text-colour: #2B0000;
    --primary-colour: #740000;
    --secondary-colour: #B50000;
    --accent-colour: #E35053;
    --page-background-colour: #F6CACC;
    --text-background-colour: white;
    /*
    --text-link-unvisited-colour: #0000EE;
    --text-link-visited-colour: #551A8B;
    --github-calendar-level-0-colour: var(--color-calendar-graph-day-bg);
    --github-calendar-level-1-colour: var(--color-calendar-graph-day-L1-bg);
    --github-calendar-level-2-colour: var(--color-calendar-graph-day-L2-bg);
    --github-calendar-level-3-colour: var(--color-calendar-graph-day-L3-bg);
    --github-calendar-level-4-colour: var(--color-calendar-graph-day-L4-bg);
    */
}
:root[data-theme="dark"] {
    /*
    --text-colour: #E0E0E0; /* Light * /
    --primary-colour: #740000; /* Dark * /
    --secondary-colour: #B50000; /* Medium * /
    --accent-colour: #FF4081; /* Light-medium * /
    --page-background-colour: #121212; /* Dark * /
    --text-background-colour: black; /* Black * /
    */
    /* Dark red theme */
    --text-colour: #E0E0E0; /* Light Gray */
    --primary-colour: #980000; /* Slightly lighter Dark Red */
    --secondary-colour: #D30000; /* Slightly lighter Medium Red */
    --accent-colour: #FF4081; /* Pink */
    --page-background-colour: #121212; /* Dark Gray */
    --text-background-colour: black; /* Dark Red */
    --text-link-unvisited-colour: #ADD8E6; /* Light Blue */
    --text-link-visited-colour: #D8BFD8; /* Thistle (Light Purple) */
    --github-calendar-level-0-colour: rgba(30, 30, 30, 255); /* var(--text-background-colour); */
    --github-calendar-level-1-colour: #ff5252;
    --github-calendar-level-2-colour: #f30000;
    --github-calendar-level-3-colour: #c10000;
    --github-calendar-level-4-colour: #840000;
}

/* Toggle light mode / dark mode button */
.theme-switch {
    background: none;
    border: none;
    cursor: pointer;
    width: 4vh;
    height: 4vh;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    margin-top: auto;
    border-radius: 2vh;
}
.theme-switch:hover {
    background-color: var(--primary-colour);
}
.theme-switch img.theme-icon,
.theme-switch svg.theme-icon {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: opacity 1s ease, transform 1s ease;
    position: absolute;
    margin-top: auto;
}
img.theme-icon.dark-mode-icon {
    top: 0vh;
    left: 0vh;
}
svg.theme-icon.light-mode-icon {
    width: 3.5vh;
    height: 3.5vh;
    top: 0.25vh;
    left: 0.25vh;
}
svg.theme-icon.light-mode-icon .background {
    fill: var(--secondary-colour);
}
.theme-switch:hover svg.theme-icon.light-mode-icon .background {
    fill: var(--primary-colour);
}
svg.theme-icon.light-mode-icon .sun {
    fill: var(--text-colour);
    stroke: var(--text-colour);
}
/*
svg.theme-icon {
    width: 2vh;
    height: 2vh;
}
*/

/* Hide the icon that doesn't match the current theme */
[data-theme="light"] .theme-switch .dark-mode-icon {
    opacity: 1;
    display: block;
    transform: rotate(0deg);
}
[data-theme="light"] .theme-switch .light-mode-icon {
    opacity: 0;
    display: none;
    transform: rotate(90deg);
}

[data-theme="dark"] .theme-switch .dark-mode-icon {
    opacity: 0;
    display: none;
    transform: rotate(-90deg);
}
[data-theme="dark"] .theme-switch .light-mode-icon {
    opacity: 1;
    display: block;
    transform: rotate(0deg);
}