dark-mode.css

/* Dark Mode Styles for Learn You a Haskell */

/* Dark mode is activated by adding 'dark-mode' class to body */
body.dark-mode {
    background-color: #1a1a1a;
    color: #e0e0e0;
}

body.dark-mode.introcontent {
    /* Add a semi-transparent dark overlay on top of bg.png */
    background-image: linear-gradient(rgba(26, 26, 26, 0.75), rgba(26, 26, 26, 0.75)), url(../images/bg.png);
    background-color: #1a1a1a;
}

body.dark-mode .bgwrapper {
    background-color: #1a1a1a;
}

body.dark-mode h1,
body.dark-mode h2,
body.dark-mode h3 {
    color: #e0e0e0;
}

body.dark-mode a {
    color: #66b3ff;
}

body.dark-mode a:visited {
    color: #9999ff;
}

body.dark-mode a:hover {
    color: #ff6666;
}

body.dark-mode :not(pre) > code:not(.label, .function, .type, .class, .law) {
    background-color: #2d2d2d;
    color: #e0e0e0;
}

body.dark-mode pre > code {
    background-color: #0d0d0d;
    color: #90ee90;
}

body.dark-mode .hintbox {
    background-color: #2d2d1a;
    background-image: none !important;
    color: #f0f0f0;
    border: 1px solid #5a5a3a;
}

body.dark-mode .chapters > li > a {
    color: #e0e0e0;
    border-bottom: 1px solid #404040;
}

body.dark-mode .chapters > li > a:visited {
    color: #b0b0b0;
}

body.dark-mode .chapters > li > a:hover {
    color: #ff6666;
}

body.dark-mode .chapters > li > ul > li > a {
    color: #e0e0e0;
}

body.dark-mode .chapters > li > ul > li > a:visited {
    color: #b0b0b0;
}

body.dark-mode .chapters > li > ul > li > a:hover {
    color: #ff6666;
}

body.dark-mode .errata {
    background-color: #3d1a1a;
    color: #e0e0e0;
}

/* Dark mode toggle button */
.dark-mode-toggle {
    position: fixed;
    top: 40px;
    right: 20px;
    /* Using z-index 10000 to match the Ukraine banner and ensure visibility */
    z-index: 10000;
    background-color: #333;
    color: white;
    border: 2px solid #555;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
}

.dark-mode-toggle:hover {
    background-color: #444;
    transform: scale(1.1);
}

body.dark-mode .dark-mode-toggle {
    background-color: #f0f0f0;
    color: #333;
    border-color: #ccc;
}

body.dark-mode .dark-mode-toggle:hover {
    background-color: #e0e0e0;
}

/* Adjust toggle button for mobile */
@media screen and (max-width: 600px) {
    .dark-mode-toggle {
        width: 45px;
        height: 45px;
        font-size: 20px;
        top: 40px;
        right: 10px;
    }
}

/* Dark mode for index page specific elements */
body.dark-mode {
    background-color: #1a1a1a !important;
}

body.dark-mode #newsplash {
    color: #e0e0e0;
    background-color: #1a1a1a !important;
    position: relative;
    overflow: hidden; /* Prevent content from spilling outside the container */
}

/* Add a dark overlay using pseudo-element to dim background while keeping text readable */
body.dark-mode #newsplash::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(26, 26, 26, 0.40);
    pointer-events: none;
    z-index: 0;
}

/* Ensure content is above the overlay and constrain width to prevent overflow */
/* The text div is absolutely positioned, so we need to constrain it with explicit left/right */
/* Parent container is 880px wide, text should wrap within it with proper margins */
body.dark-mode #newsplash > div[style*="position:absolute"] {
    position: absolute !important; /* Keep original positioning */
    z-index: 1;
    left: 0 !important;
    right: 20px !important; /* 20px margin on the right to prevent overflow */
    padding-left: 20px; /* Match the left padding to keep text centered */
    padding-right: 20px; /* Additional padding for safety */
    box-sizing: border-box;
}

body.dark-mode .newsplash a.nostarchlink {
    color: #66b3ff;
}

body.dark-mode .newsplash a.nostarchlink:hover {
    color: #ff6666;
}

/* Make index page buttons slightly more visible in dark mode without hiding graphics */
body.dark-mode #faq-button,
body.dark-mode #book-button,
body.dark-mode #read-button {
    /* Keep the buttons as clickable areas over the dimmed graphics */
    opacity: 1;
}

/* Handle image backgrounds in dark mode */
body.dark-mode img {
    opacity: 0.9;
    background-color: transparent;
}

/* Keep images at full opacity when needed */
body.dark-mode img.full-opacity {
    opacity: 1;
}