:root {
    --background-color: #ffffff;
    --text-color: #333333;
    --primary-color: #007bff;
    --primary-color-hover: #0056b3;
    --nav-footer-bg-color: #f8f9fa;
    --border-color: #dee2e6;
    --card-bg-color: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

[data-theme='dark'] {
    --background-color: #121212;
    --text-color: #e0e0e0;
    --primary-color: #4dabf7;
    --primary-color-hover: #1e90ff;
    --nav-footer-bg-color: #1c1c1c;
    --border-color: #444444;
    --card-bg-color: #1e1e1e;
    --shadow-color: rgba(255, 255, 255, 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

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

a:hover {
    text-decoration: underline;
    color: var(--primary-color-hover);
}

header, footer {
    background-color: var(--nav-footer-bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    width: 100%;
}

footer {
    border-top: 1px solid var(--border-color);
    border-bottom: none;
    text-align: center;
    margin-top: auto;
    padding: 2rem 0;
}

footer p {
    margin-bottom: 0.5rem;
}

nav {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 90%;
    max-width: 960px;
    margin: 0 auto;
}

nav a {
    margin: 0 1rem;
    font-weight: 500;
}

nav a.brand {
    font-size: 1.5rem;
    font-weight: bold;
    margin-right: auto;
}

nav button {
    margin-left: 1rem;
}

main {
    width: 90%;
    max-width: 960px;
    margin: 2rem auto;
    flex: 1;
}

.hero {
    text-align: center;
    padding: 2rem 0;
    margin-bottom: 2rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.content h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.post-snippet {
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 8px var(--shadow-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

.post-snippet:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px var(--shadow-color);
}

.post-snippet h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.post-snippet p {
    margin-bottom: 1rem;
}

.read-more {
    font-weight: bold;
}

/* AdSense Placeholder */
.adsbygoogle {
    background-color: var(--card-bg-color);
    border: 1px dashed var(--border-color);
    margin: 2rem 0;
    min-height: 100px;
}

/* Contact Form */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--background-color);
    color: var(--text-color);
    font-size: 1rem;
}

button[type="submit"] {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
}

button[type="submit"]:hover {
    background-color: var(--primary-color-hover);
}

button#theme-toggle {
    padding: 0.5rem 1rem;
    cursor: pointer;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--card-bg-color);
    color: var(--text-color);
}

/* Responsive */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        align-items: flex-start;
    }
    nav a, nav button {
        margin: 0.5rem 0;
    }
    nav a.brand {
        margin-right: 0;
        margin-bottom: 1rem;
    }
    nav button#theme-toggle {
        margin-left: 0;
    }
    .hero h1 {
        font-size: 2rem;
    }
}