/* Google Material Design Inspired Palette */
:root {
    --google-blue: #4285F4;
    --google-green: #34A853;
    --google-yellow: #FBBC05;
    --google-red: #EA4335;
    --text-dark: #202124;
    --text-light: #5f6368;
    --bg-light: #F8F9FA;
    --card-bg: #FFFFFF;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --border-color: #dadce0;
}

body {
    font-family: 'Google Sans', 'Roboto', Arial, sans-serif;
    line-height: 1.6;
    margin: 0 auto;
    max-width: 1000px;
    padding: 40px;
    color: var(--text-dark);
    background-color: var(--bg-light);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1 {
    font-size: 3.8em;
    font-weight: 700;
    color: var(--text-dark);
    text-align: center;
    margin-bottom: 1.2em;
    position: relative;
    padding-bottom: 25px;
}

h1::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: 0;
    transform: translateX(-50%);
    width: 120px;
    height: 6px;
    background: linear-gradient(to right, var(--google-blue), var(--google-green));
    border-radius: 3px;
}

.total-tasks {
    text-align: center;
    font-size: 1.5em;
    color: var(--text-light);
    margin-top: -1em;
    margin-bottom: 2em;
}

h2 {
    font-size: 2.8em;
    font-weight: 600;
    color: var(--text-dark);
    margin-top: 0.5em;
    margin-bottom: 0.5em;
    padding: 0;
    border-bottom: none;
}

h3 {
    font-size: 2.2em;
    font-weight: 500;
    color: var(--text-dark);
    margin-top: 2.5em;
    margin-bottom: 0.8em;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

h4 {
    font-size: 1.8em;
    font-weight: 500;
    color: var(--text-dark);
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-bottom: none;
    border-radius: 8px 8px 0 0;
    padding: 20px 25px;
    margin-top: 2.5em;
    margin-bottom: 0;
    box-shadow: 0 2px 4px var(--shadow-color);
}

h4 + ul {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-top: none;
    border-radius: 0 0 8px 8px;
    padding: 20px 25px;
    margin-top: 0;
    margin-bottom: 2.5em;
    box-shadow: 0 2px 4px var(--shadow-color);
}

/* Styling for the main index page chapter links */
.chapter-grid {
    display: block; /* Change to block display */
    padding: 0;
    margin-top: 3em;
}

.chapter-grid h2 a {
    display: block;
    padding: 0.5em; /* Further reduced padding */
    text-decoration: none;
    font-size: 1em; /* Further reduced font size */
    font-weight: 600;
    color: var(--text-dark);
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 4px 8px var(--shadow-color);
    transition: all 0.2s ease-in-out;
    text-align: center;
    height: auto;
    box-sizing: border-box;
    margin-bottom: 0.5em; /* Further reduced margin between blocks */
}

.chapter-grid h2 {
    border-bottom: none; /* Remove horizontal line */
    margin-top: 0.5em; /* Adjust top margin */
    margin-bottom: 0.5em; /* Adjust bottom margin */
    padding: 0; /* Remove padding */
}

.chapter-grid h2 a:hover {
    background-color: var(--google-blue);
    color: var(--card-bg);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    transform: translateY(-5px);
}

/* General list styling (for tasks within chapters) */
ul {
    list-style-type: none;
    padding-left: 0;
}

li {
    margin-bottom: 1em;
    padding-left: 30px;
    position: relative;
    color: var(--text-light);
}

li:before {
    content: '\2022'; /* Unicode for bullet point */
    color: var(--google-blue);
    font-size: 1.2em;
    position: absolute;
    left: 0;
    top: 0;
}

code {
    font-family: 'Roboto Mono', monospace;
    background-color: var(--bg-light);
    padding: 4px 8px;
    border-radius: 4px;
    color: var(--google-red);
    font-size: 0.9em;
}

pre {
    background-color: #282c34; /* Dark background for code blocks */
    color: #abb2bf;
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.95em;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}