/* CSS Variables and Root Styles */
:root {
    --bg-light: #f8f9fa;
    --text-light: #212529;
    --accent-light: #007bff;
    --border-light: #dee2e6;
    --card-bg-light: #ffffff;

    --bg-dark: #121212;
    --text-dark: #e9ecef;
    --accent-dark: #80bfff;
    --border-dark: #343a40;
    --card-bg-dark: #1e1e1e;

    --bg: var(--bg-light);
    --text: var(--text-light);
    --accent: var(--accent-light);
    --border: var(--border-light);
    --card-bg: var(--card-bg-light);

    --font-sans: 'Inter', sans-serif;
    --font-serif: 'Lora', serif;
    --max-width: 1200px;
    --max-width-article: 800px;
    --border-radius: 8px;
}

[data-theme="dark"] {
    --bg: var(--bg-dark);
    --text: var(--text-dark);
    --accent: var(--accent-dark);
    --border: var(--border-dark);
    --card-bg: var(--card-bg-dark);
}

/* Base Styles */
html, body {
    height: 100%;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-serif);
    -webkit-font-smoothing: antialiased;
    transition: background 0.3s, color 0.3s;
    font-size: 1.05rem; /* Base font size optimized for readability */
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem;
}

/* Header and Navigation */
header.masthead {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.mastbrand .title {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0;
}

.mastbrand .strap {
    font-size: 1rem;
    color: var(--text);
    opacity: 0.7;
}

.mastbrand a {
    text-decoration: none;
    color: var(--text);
}

.nav-container {
    display: flex;
    align-items: center;
}

nav.sections a {
    text-decoration: none;
    color: var(--text);
    margin-left: 1.5rem;
    font-weight: 500;
}

/* Layout */
.layout {
    display: grid;
    grid-template-columns: 3fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

/* Lead Article (Homepage) */
.lead {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.lead h2 {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    margin: 0 0 1rem;
}

.lead h2 a {
    text-decoration: none;
    color: var(--text);
}

.byline {
    margin-bottom: 1rem;
    opacity: 0.7;
}

.lede {
    font-size: 1.2rem;
    line-height: 1.6;
    max-width: 65ch; /* Optimal measure for readability: 45-75 characters */
    letter-spacing: 0.01em; /* Slight letter spacing for better readability */
}

/* Article Cards (Homepage) */
.articles {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.article {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.article h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    margin: 0 0 0.5rem;
}

.article h3 a {
    text-decoration: none;
    color: var(--text);
}

.article .meta {
    margin-bottom: 0.5rem;
    opacity: 0.7;
    font-size: 0.9rem;
}

/* Sidebar */
.sidebar .card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.sidebar h4 {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    margin: 0 0 1rem;
}

.mini-list a {
    display: block;
    text-decoration: none;
    color: var(--text);
    margin-bottom: 0.5rem;
}

/* Article Page Styles */
.article-header {
    margin-bottom: 1.5rem;
}

.article-header h1 {
    font-family: var(--font-serif);
    font-size: 3rem;
    margin: 0 0 1rem;
}

.article-content {
    font-size: 1.2rem;
    line-height: 1.6;
    max-width: 65ch; /* Optimal measure for readability: 45-75 characters */
    padding: 0;
}

.article-content p,
.article-content ul,
.article-content ol,
.article-content pre {
    margin-bottom: 1.4rem;
    letter-spacing: 0.01em; /* Slight letter spacing for better readability */
}

.article-content a {
    color: var(--accent);
}

.article-content h2 {
    font-family: var(--font-serif);
    font-size: 2rem;
    margin-top: 3rem;
    margin-bottom: 1.5rem;
}

.article-content h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    opacity: 0.7;
}

/* Theme Switch */
.theme-switch-wrapper {
    display: flex;
    align-items: center;
}

.theme-switch {
    display: inline-block;
    height: 24px;
    position: relative;
    width: 48px;
}

.theme-switch input {
    display:none;
}

.slider {
    background-color: #ccc;
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: .4s;
}

.slider:before {
    background-color: #fff;
    bottom: 4px;
    content: "";
    height: 16px;
    left: 4px;
    position: absolute;
    transition: .4s;
    width: 16px;
}

input:checked + .slider {
    background-color: var(--accent);
}

input:checked + .slider:before {
    transform: translateX(24px);
}

.slider.round {
    border-radius: 24px;
}

.slider.round:before {
    border-radius: 50%;
}

/* Responsive Design */
@media (max-width: 992px) {
    .layout {
        grid-template-columns: 1fr;
    }
}

/* Article Page Container Override */
.container.article-container {
    max-width: var(--max-width-article);
}

/* Article Page Masthead Override */
.article-container header.masthead {
    margin-bottom: 2rem;
}

.article-container .mastbrand .title {
    font-size: 1.5rem;
}