/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #ffffff;
}

/* Header */
.header {
    text-align: center;
    padding: 4rem 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 2rem;
    line-height: 1.2;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

/* Authors Section */
.authors {
    margin: 2rem 0;
}

.author-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px 50px;
    margin-bottom: 25px;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.author-item {
    text-align: center;
}

.author-name {
    font-size: 1.2rem;
    color: #0366d6;
    margin-bottom: 4px;
    font-weight: 500;
}

.author-affiliation {
    color: #666;
    font-size: 0.95rem;
}

.footnote {
    margin: 25px auto;
    max-width: 700px;
    font-size: 0.9em;
    color: #666;
    line-height: 1.6;
    text-align: center;
}

/* Navigation */
.nav-bar {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.nav-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: #24292e;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-size: 0.95rem;
    transition: background-color 0.2s;
}

.nav-button:hover {
    background-color: #0366d6;
}

.nav-button svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

/* Figure Section */
.figure-section {
    width: 100%;
    max-width: 1200px;
    margin: 2rem auto 4rem;
    padding: 0 1rem;
    text-align: center;
}

.figure-section img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

/* Container & Content */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1.5rem 4rem;
}

.abstract-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 1.5rem;
    text-align: center;
    border-bottom: none;
}

.content {
    font-size: 1.1rem;
    color: #333;
    text-align: justify;
}

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

/* Figures in content */
.figure {
    margin: 40px 0;
    text-align: center;
}

.content-img {
    max-width: 100%;
    height: auto;
    margin-bottom: 15px;
}

.caption {
    margin-top: 15px;
    font-size: 0.95em;
    color: #666;
    font-style: italic;
}

/* Sections */
section {
    margin: 50px 0;
}

h2 {
    font-size: 1.8em;
    font-weight: 600;
    color: #222;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #0366d6;
}

p {
    font-size: 1.05em;
    color: #444;
    margin-bottom: 15px;
    text-align: justify;
}

/* Citation Box */
.citation-box {
    background-color: #f6f8fa;
    border: 1px solid #e1e4e8;
    border-radius: 6px;
    padding: 20px;
    margin-top: 20px;
    overflow-x: auto;
}

.citation-box pre {
    margin: 0;
    font-family: 'Courier New', Courier, monospace;
}

.citation-box code {
    font-size: 0.9em;
    color: #24292e;
    display: block;
    white-space: pre;
}

/* Footer */
footer {
    margin-top: 60px;
    padding-top: 30px;
    border-top: 1px solid #e1e4e8;
    text-align: center;
    color: #666;
    font-size: 0.9em;
}

/* Responsive Design */
@media (max-width: 768px) {
    h1 {
        font-size: 1.8rem;
    }

    .author-list {
        gap: 20px;
        flex-direction: column;
    }
    
    .container {
        padding-bottom: 2rem;
    }
}