:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --background-color: #ffffff;
    --text-color: #1f2937;
    --accent-color: #3b82f6;
    --border-color: #e5e7eb;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

/* Navigation */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(5px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.logo_font {
    font-family: 'Courier New', Courier, monospace;
}

.nav-links a {
    margin-left: 2rem;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    padding: 8rem 2rem 4rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    min-height: 80vh;
}

.hero-content {
    flex: 1;
    padding-left: 2rem;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 1.5rem;
    color: var(--text-color);
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

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

.tech-badges img {
    height: 24px;
}

.hero-animation {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding-right: 2rem;
}

.hero-animation img {
    max-width: 100%;
    height: auto;
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* Buttons */
.button {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
}

.button i {
    margin-right: 0.5rem;
}

.button.primary {
    background-color: var(--primary-color);
    color: white;
}

.button.primary:hover {
    background-color: var(--secondary-color);
}

.button.secondary {
    background-color: white;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.button.secondary:hover {
    background-color: var(--primary-color);
    color: white;
}

/* Sections */
section {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

section h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    text-align: center;
}

/* About Section */
.abstract {
    background-color: white;
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.abstract h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.abstract ul {
    list-style-position: inside;
    margin: 1rem 0;
}

.abstract li {
    margin-bottom: 0.5rem;
}

/* Leaderboard */
.leaderboard-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.tab-button {
    padding: 0.75rem 1.5rem;
    border: none;
    background: none;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-color);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
}

.tab-button.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 2rem;
    background-color: white;
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: #f8fafc;
    font-weight: 600;
}

tr:last-child td {
    border-bottom: none;
}

.submit-section {
    text-align: center;
    margin-top: 2rem;
}

.submit-button {
    padding: 0.75rem 2rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.submit-button:hover {
    background-color: var(--secondary-color);
}

/* Paper Section */
.paper-content {
    background-color: white;
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.paper-info h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.authors {
    color: #6b7280;
    margin-bottom: 0.5rem;
}

.affiliations {
    color: #6b7280;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.paper-links {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.citation {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.citation h4 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.citation p {
    margin-bottom: 1rem;
}

.citation pre {
    background-color: #f8fafc;
    padding: 1rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    line-height: 1.4;
}

.citation code {
    white-space: pre;
}

/* Footer */
footer {
    background-color: #f8fafc;
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer-content p {
    margin-bottom: 0.5rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: 6rem;
    }

    .hero-content {
        padding-left: 0;
        margin-bottom: 2rem;
    }

    .hero-animation {
        padding-right: 0;
        margin-bottom: 2rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .tech-badges {
        justify-content: center;
    }

    .nav-links {
        display: none;
    }

    table {
        display: block;
        overflow-x: auto;
    }

    .paper-links {
        flex-direction: column;
        align-items: center;
    }
}