:root {
    /* Light Mode (Default) */
    --bg-color: #ffffff;
    --text-color: #1a202c;
    --text-secondary: #4a5568;
    --accent-color: #2563eb;
    --border-color: #e2e8f0;
    --card-bg: #ffffff;
    --card-hover-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);

    --font-main: 'Source Sans 3', system-ui, -apple-system, sans-serif;
    --font-heading: 'Libre Baskerville', serif;
}

body.dark-mode {
    /* Dark Mode */
    --bg-color: #0f172a;
    --text-color: #e2e8f0;
    --text-secondary: #94a3b8;
    --accent-color: #38bdf8;
    --border-color: #1e293b;
    --card-bg: #1e293b;
    --card-hover-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.15);
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    margin: 0;
    padding: 0;
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

header {
    padding: 2rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 800px;
    margin: 0 auto;
    border-bottom: 1px solid var(--border-color);
}

.site-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-color);
    text-decoration: none;
    letter-spacing: -0.02em;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 1.5rem;
    padding: 0;
    margin: 0;
    align-items: center;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s ease;
}

nav a:hover {
    color: var(--accent-color);
}

/* Theme Toggle Button */
#theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color 0.2s ease, color 0.2s ease;
}

#theme-toggle:hover {
    background-color: var(--border-color);
    color: var(--text-color);
}

.sun-icon {
    display: none;
}

.moon-icon {
    display: block;
}

body.dark-mode .sun-icon {
    display: block;
}

body.dark-mode .moon-icon {
    display: none;
}

main {
    max-width: 800px;
    margin: 0 auto;
    padding: 3rem 1rem;
}

h1,
h2,
h3 {
    font-family: var(--font-heading);
    color: var(--text-color);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.hero {
    text-align: left;
    margin-bottom: 4rem;
}

.hero-title {
    font-size: 1.5rem;
    /* Reduced size */
    font-weight: 400;
    /* Regular weight for serif */
    color: var(--text-color);
    letter-spacing: -0.01em;
    margin-top: 0;
}

h2 {
    font-size: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.latest-posts h2 {
    font-size: 1.1rem;
    text-align: right;
}

.post-card {
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-color);
    transition: transform 0.2s ease;
}

.post-card:last-child {
    border-bottom: none;
}

.post-title {
    margin-top: 0.5rem;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.post-title a {
    text-decoration: none;
    color: var(--text-color);
    transition: color 0.2s ease;
}

.post-title a:hover {
    color: var(--accent-color);
}

.post-meta {
    color: var(--text-secondary);
    font-size: 0.875rem;
    display: block;
    margin-bottom: 0.25rem;
}

.post-summary {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.read-more {
    display: inline-block;
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
}

.read-more:hover {
    text-decoration: underline;
}

/* Archive Styles */
.archive-list {
    list-style: none;
    padding: 0;
}

.archive-item {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.archive-item a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
}

.archive-item a:hover {
    color: var(--accent-color);
}

.archive-date {
    color: var(--text-secondary);
    font-family: monospace;
    font-size: 0.9rem;
}

footer {
    text-align: center;
    padding: 3rem 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
}

/* Typography for content */
.content {
    font-size: 1.125rem;
    color: var(--text-color);
}

.content h1 {
    font-size: 1.8rem;
}

.content h2 {
    font-size: 1.35rem;
}

.content h3 {
    font-size: 1.1rem;
}

.content h4 {
    font-size: 0.9rem;
}

.content p {
    margin-bottom: 1.5rem;
}

.content a {
    color: var(--accent-color);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.content a:hover {
    border-bottom-color: var(--accent-color);
}