:root {
    /* Colors - High Contrast Dark Mode */
    --bg-body: #050505;
    --text-primary: #e5e5e5;
    --text-secondary: #a3a3a3;
    --accent: #3b82f6;
    /* Subtle Blue */
    --border: #262626;
    --code-bg: #171717;

    /* Typography */
    --font-serif: 'Merriweather', serif;
    --font-sans: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

body {
    background-color: var(--bg-body);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

/* Layout */
.paper-container {
    max-width: 720px;
    margin: 0 auto;
    padding: 4rem 1.5rem;
}

/* Typography & Headings */
h1,
h2,
h3,
h4 {
    font-family: var(--font-serif);
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.3;
}

h1.paper-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.paper-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-weight: 300;
}

h2 {
    font-size: 1.5rem;
    margin-top: 3rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
}

h3 {
    font-size: 1.15rem;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    font-family: var(--font-sans);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

p {
    margin-bottom: 1.2rem;
    color: var(--text-secondary);
}

strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Links */
a {
    color: var(--text-primary);
    text-decoration: none;
    border-bottom: 1px solid var(--border);
    transition: border-color 0.2s, color 0.2s;
}

a:hover {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

/* Header Meta */
.meta-links {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.meta-links a {
    border-bottom: none;
    color: var(--accent);
}

.meta-links a:hover {
    text-decoration: underline;
}

.separator {
    margin: 0 0.5rem;
    color: var(--border);
}

/* Abstract */
.abstract {
    font-style: italic;
    background: var(--code-bg);
    padding: 1.5rem;
    border-left: 3px solid var(--accent);
    margin: 2rem 0;
    border-radius: 4px;
}

.abstract h2 {
    font-size: 1rem;
    margin-top: 0;
    margin-bottom: 0.5rem;
    border-bottom: none;
    font-family: var(--font-sans);
    text-transform: uppercase;
    color: var(--text-secondary);
}

.abstract p {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.abstract-nav {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

.abstract-nav strong {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.abstract-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1.5rem;
}

.abstract-nav li {
    margin: 0;
    padding: 0;
}

.abstract-nav a {
    color: var(--accent);
    border-bottom: none;
}

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

/* Code & Pre */
code {
    font-family: var(--font-mono);
    background: var(--code-bg);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-size: 0.85em;
    color: var(--text-primary);
}

/* Tables */
.table-wrapper {
    overflow-x: auto;
    margin: 2rem 0;
    border: 1px solid var(--border);
    border-radius: 6px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

th,
td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    background: var(--code-bg);
    font-weight: 600;
    color: var(--text-primary);
}

td {
    color: var(--text-secondary);
}

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

/* Specs Grid */
.specs-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 1.5rem 0;
}

.spec-block ul {
    list-style: none;
    padding: 0;
}

.spec-block li {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding-left: 1rem;
    position: relative;
}

.spec-block li::before {
    content: '›';
    position: absolute;
    left: 0;
    color: var(--accent);
}

/* Lists */
ul,
ol {
    margin-bottom: 1.2rem;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

li {
    margin-bottom: 0.5rem;
}

/* Divider */
.divider {
    border: 0;
    height: 1px;
    background: var(--border);
    margin: 2rem 0;
}

/* Footer */
.paper-footer {
    margin-top: 4rem;
    text-align: center;
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.footer-links a {
    border-bottom: none;
    color: var(--text-secondary);
}

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

.copyright {
    color: var(--text-secondary);
    opacity: 0.6;
}

/* Staff Section */
.staff-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.staff-card {
    background: var(--code-bg);
    padding: 1rem;
    border-radius: 6px;
    border: 1px solid var(--border);
    transition: border-color 0.2s;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.staff-card:hover {
    border-color: var(--accent);
}

.staff-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
    border: 1px solid var(--border);
}

.staff-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.staff-name {
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: none;
    font-family: var(--font-serif);
}

.staff-name:hover {
    color: var(--accent);
    text-decoration: underline;
}

.staff-role {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Responsive */
@media (max-width: 600px) {
    .paper-container {
        padding: 2rem 1rem;
    }

    h1.paper-title {
        font-size: 2rem;
    }

    .specs-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}