:root {
    --primary-color: #1a1a1a;
    --secondary-color: #4a4a4a;
    --accent-color: #0066cc;
    --background-color: #ffffff;
    --section-background: #f8f9fa;
    --max-width: 800px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--primary-color);
    background-color: var(--background-color);
}

header {
    text-align: center;
    padding: 4rem 1rem;
    background-color: var(--section-background);
}

header h1 {
    max-width: var(--max-width);
    margin: 0 auto 2rem;
    font-size: 2.5rem;
    line-height: 1.3;
}

.authors {
    margin-bottom: 1.5rem;
}

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

.authors a:hover {
    text-decoration: underline;
}

.affiliations {
    font-size: 0.9rem;
    color: var(--secondary-color);
}

nav {
    position: sticky;
    top: 0;
    background-color: var(--background-color);
    padding: 1rem;
    text-align: center;
    border-bottom: 1px solid #eee;
    z-index: 1000;
}

nav a {
    color: var(--accent-color);
    text-decoration: none;
    margin: 0 1rem;
    font-weight: 500;
}

nav a:hover {
    text-decoration: underline;
}

main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem 1rem;
}

section {
    margin-bottom: 3rem;
    padding: 2rem;
    background-color: var(--section-background);
    border-radius: 8px;
}

h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}
h3 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
    margin-top: 2rem;
    font-size: 1.4rem;
    font-weight: 600;
}

#highlights ul {
    list-style: none;
}

#highlights li {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    position: relative;
}

#highlights li::before {
    content: "•";
    color: var(--accent-color);
    position: absolute;
    left: 0;
}

#abstract p {
    margin-bottom: 1rem;
    text-align: justify;
}

.keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.keywords span {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--secondary-color);
    border: 1px solid #eee;
}

footer {
    text-align: center;
    padding: 2rem 1rem;
    background-color: var(--section-background);
    color: var(--secondary-color);
    font-size: 0.9rem;
}

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

footer a:hover {
    text-decoration: underline;
}

.buttons {
    margin-top: 1.5rem;
    text-align: center;
}

.button {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background-color: var(--accent-color);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 500;
    transition: background-color 0.2s;
}

.button:hover {
    background-color: #0052a3;
}

#code ul, #data ul {
    list-style: none;
    margin-left: 1rem;
}

#code li, #data li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

#code li::before, #data li::before {
    content: "→";
    color: var(--accent-color);
    position: absolute;
    left: 0;
}

@media (max-width: 600px) {
    header h1 {
        font-size: 1.8rem;
    }

    nav {
        padding: 0.5rem;
    }

    nav a {
        margin: 0 0.5rem;
        font-size: 0.9rem;
    }

    section {
        padding: 1rem;
    }
}

.image-container {
    margin: 2rem 0;
    text-align: center;
}

.image-container img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Add these new styles for side-by-side images */
.image-row {
    display: flex;
    gap: 2rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.image-item {
    flex: 1;
    text-align: center;
    min-width: 300px;
}

.image-item img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.caption {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--secondary-color);
}

.event-details {
    background-color: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.event-details p {
    margin: 0.5rem 0;
}

.event-details strong {
    color: var(--primary-color);
    margin-right: 0.5rem;
}