html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #ffffff;
    color: #222222;
    line-height: 1.75;
}

a {
    color: #003366;
    text-decoration: none;
}

a:hover,
a:focus {
    text-decoration: underline;
}

.site-header {
    border-bottom: 1px solid #d9d9d9;
    padding: 0.9rem 1.2rem;
    background: #ffffff;
}

.site-header-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.site-title a {
    font-size: 1.1rem;
    font-weight: 600;
    color: #111111;
    text-decoration: none;
}

.main-nav {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.main-nav a {
    font-size: 0.95rem;
    color: #333333;
}

.paper-page {
    padding: 2rem 1.2rem 3rem 1.2rem;
}

.paper-container {
    max-width: 860px;
    margin: 0 auto;
}

.paper-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.paper-header h1 {
    font-size: 2.2rem;
    line-height: 1.2;
    margin: 0 0 1rem 0;
    font-weight: 600;
}

.paper-subtitle {
    font-size: 1.1rem;
    line-height: 1.5;
    color: #555555;
    margin: 0;
}

.paper-meta {
    margin-bottom: 2.5rem;
    padding: 1.25rem 1.4rem;
    border: 1px solid #e2e2e2;
    background: #fafafa;
}

.paper-meta p {
    margin: 0.35rem 0;
    font-size: 0.96rem;
}

.paper-section {
    margin-bottom: 2.5rem;
}

.paper-section h2 {
    font-size: 1.45rem;
    line-height: 1.3;
    margin: 0 0 1rem 0;
    font-weight: 600;
}

.paper-section h3 {
    font-size: 1.15rem;
    margin: 2rem 0 0.8rem 0;
    font-weight: 600;
}

.paper-section p {
    margin: 0 0 1.2rem 0;
}

.paper-toc {
    margin: 2.5rem 0 3rem 0;
    padding: 1.25rem 1.4rem;
    border: 1px solid #e2e2e2;
    background: #fcfcfc;
}

.paper-toc h2 {
    font-size: 1.25rem;
    margin: 0 0 1rem 0;
}

.paper-toc ul {
    margin: 0;
    padding-left: 1.2rem;
}

.paper-toc li {
    margin: 0.45rem 0;
}

.paper-figure {
    margin: 2.5rem 0;
    text-align: center;
}

.paper-figure img {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 0 auto;
}

.paper-figure figcaption {
    margin-top: 0.9rem;
    font-size: 0.95rem;
    line-height: 1.5;
    color: #555555;
}

.site-footer {
    text-align: center;
    padding: 2rem 1rem 2.5rem 1rem;
    border-top: 1px solid #e0e0e0;
    font-size: 0.9rem;
    color: #666666;
}

@media (max-width: 700px) {
    .paper-header h1 {
        font-size: 1.8rem;
    }

    .paper-subtitle {
        font-size: 1rem;
    }

    .paper-page {
        padding: 1.4rem 1rem 2.5rem 1rem;
    }

    .paper-meta,
    .paper-toc {
        padding: 1rem 1rem;
    }

    .site-header {
        padding: 0.8rem 1rem;
    }

    .site-header-inner {
        align-items: flex-start;
    }
}