body {
    font-family: 'Roboto', Arial, sans-serif;
    background: #23272a;
    color: #e0e0e0;
    margin: 0;
    padding: 0;
    letter-spacing: 0.01em;
}
header {
    background: #2c2f33;
    color: #fafafa;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}
main {
    max-width: 800px;
    margin: 2rem auto;
    background: #282c34;
    padding: 2rem;
    box-shadow: 0 4px 16px rgba(0,0,0,0.18);
    border-radius: 0;
}
nav {
    margin-bottom: 2rem;
    background: #23272a;
    border-radius: 0;
    padding: 0.75rem 1rem;
    box-shadow: 0 1px 4px rgba(0,0,0,0.10);
    display: flex;
    gap: 1rem;
}
nav a {
    color: #90caf9;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: background 0.2s, color 0.2s;
}
nav a:hover {
    background: #374151;
    color: #bbdefb;
}
.article-list {
    list-style: none;
    padding: 0;
}
.article-list li {
    margin-bottom: 1.5rem;
    background: #24272b;
    border-radius: 10px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.10);
    padding: 1rem;
    transition: box-shadow 0.2s;
}
.article-list li:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.18);
}
.article-list a {
    font-size: 1.2rem;
    color: #90caf9;
    font-weight: 500;
    text-decoration: none;
    transition: color 0.2s;
}
.article-list a:hover {
    color: #bbdefb;
}
article img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 1rem auto;
    cursor: pointer;
    border-radius: 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
}
/* Popup styles */
.img-popup-bg {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    background: rgba(0,0,0,0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}
.img-popup-bg img {
    max-width: 90vw;
    max-height: 90vh;
    border-radius: 12px;
    box-shadow: 0 4px 32px rgba(0,0,0,0.5);
}
footer {
    text-align: center;
    color: #b0b0b0;
    padding: 1rem;
    margin-top: 2rem;
    font-size: 0.95rem;
    background: #23272a;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
    box-shadow: 0 -2px 8px rgba(0,0,0,0.10);
}

/* Newly added styles for code blocks */
pre {
    background: #1e1e1e;
    color: #c5c5c5;
    padding: 0.5rem;
    border-radius: 0;
    /* Optional: add overflow scrolling for long code lines */
    overflow-x: auto;
}