:root {
    --bg-color: #ffffff;
    --text-color: #333333;
    --accent-color: #0056b3;
    --border-color: #e0e0e0;
    --hover-color: #003d82;
    --theme-bg: #f5f5f5;
    --theme-border: #ddd;
    --theme-hover: #e0e0e0;
    --date-color: #555555;
}

/* Dark theme variables when system prefers dark mode (auto setting) */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a1a1a;
        --text-color: #e0e0e0;
        --accent-color: #5fa9ff;
        --border-color: #404040;
        --hover-color: #8ac2ff;
        --theme-bg: #2d2d2d;
        --theme-border: #404040;
        --theme-hover: #3d3d3d;
        --date-color: #a0a0a0;
    }
}

/* Light theme variables when manually selected */
html[data-theme='light'] {
    --bg-color: #ffffff;
    --text-color: #333333;
    --accent-color: #0056b3;
    --border-color: #e0e0e0;
    --hover-color: #003d82;
    --theme-bg: #f5f5f5;
    --theme-border: #ddd;
    --theme-hover: #e0e0e0;
    --date-color: #555555;
}

/* Dark theme variables when manually selected */
html[data-theme='dark'] {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --accent-color: #5fa9ff;
    --border-color: #404040;
    --hover-color: #8ac2ff;
    --theme-bg: #2d2d2d;
    --theme-border: #404040;
    --theme-hover: #3d3d3d;
    --date-color: #a0a0a0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
}

h1, h2, h3 {
    color: var(--text-color);
    margin-top: 1.5em;
    margin-bottom: 0.5em;
}

h1 {
    font-size: 2.5em;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.3em;
}

h2 {
    font-size: 2em;
    color: var(--accent-color);
}

h3 {
    font-size: 1.5em;
}

a {
    color: var(--accent-color);
    text-decoration: underline;
    text-underline-offset: 2px;
    text-decoration-thickness: 1px;
    font-weight: 500;
    transition: all 0.3s ease;
}

a:hover, a:focus {
    color: var(--hover-color);
    text-decoration-thickness: 2px;
    outline: none;
}

a:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.section {
    margin-bottom: 2em;
    padding: 1em;
    border: 1px solid var(--border-color);
    border-radius: 5px;
}

.entry {
    margin-bottom: 1.5em;
}

.date {
    color: var(--date-color);
    font-style: italic;
    margin: 0.5em 0;
}

.overview {
    font-weight: 500;
    margin: 0.5em 0;
}

ul {
    margin: 0.5em 0;
    padding-left: 1.5em;
}

li {
    margin: 0.3em 0;
}

hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 2em 0;
}

.theme-switch {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 100;
}

#themeToggle {
    padding: 8px 16px;
    background-color: var(--theme-bg);
    border: 1px solid var(--theme-border);
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-color);
    transition: all 0.3s ease;
}

#themeToggle:hover {
    background-color: var(--theme-hover);
}

#themeToggle:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

@media (max-width: 600px) {
    body {
        padding: 10px;
    }
    
    h1 {
        font-size: 2em;
    }
    
    h2 {
        font-size: 1.5em;
    }
    
    h3 {
        font-size: 1.2em;
    }
}