body {
    --accent: #a88cc4;
    --accent-glow: rgba(168, 140, 196, 0.15);
    --accent-soft: rgba(168, 140, 196, 0.05);
    --font-display: 'IBM Plex Serif', Georgia, 'Times New Roman', serif;
    --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'IBM Plex Mono', 'Fira Code', monospace;
    background: #0a0812;
}

/* === RESEARCH NAVBAR — academic lab === */
.navbar {
    height: 60px;
    border-bottom: 1px solid var(--border);
    background: rgba(10, 8, 18, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.navbar.scrolled {
    background: rgba(10, 8, 18, 0.98);
    border-bottom: 1px solid var(--accent);
}

.logo a {
    gap: 0.5rem;
}

.logo-icon {
    width: 20px;
    height: 20px;
    opacity: 0.8;
}

.logo span {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.8rem;
    letter-spacing: 0.02em;
    color: var(--text);
    text-transform: uppercase;
}

/* Nav links — bracket style */
.nav-link {
    color: var(--text-tertiary);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 500;
    padding: 0.5rem 0.75rem;
    transition: color var(--transition);
    position: relative;
}

.nav-link::before {
    content: '[';
    color: var(--text-faint);
    margin-right: 0.2rem;
    transition: color var(--transition);
}

.nav-link::after {
    content: ']';
    color: var(--text-faint);
    margin-left: 0.2rem;
    transition: color var(--transition);
}

.nav-link:hover {
    color: var(--text);
}

.nav-link:hover::before,
.nav-link:hover::after {
    color: var(--accent);
}

.nav-link.active {
    color: var(--accent);
}

.nav-link.active::before,
.nav-link.active::after {
    color: var(--accent);
}

/* Search — monospace terminal-like */
.search-input {
    width: 180px;
    background: rgba(168, 140, 196, 0.04);
    border: 1px solid var(--border);
    border-radius: 2px;
    color: var(--text);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    padding: 0.4rem 0.6rem;
    padding-right: 1.5rem;
    transition: border-color var(--transition), width var(--transition), background var(--transition);
}

.search-input::placeholder {
    color: var(--text-faint);
    font-family: var(--font-mono);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent);
    background: rgba(168, 140, 196, 0.08);
    width: 220px;
    box-shadow: 0 0 0 2px rgba(168, 140, 196, 0.1);
}

.search-hint {
    color: var(--text-faint);
    font-family: var(--font-mono);
}

/* === RESEARCH FOOTER — lab style === */
footer {
    border-top: 1px solid var(--border);
    padding: var(--space-xl);
    background: rgba(10, 8, 18, 0.6);
}

.footer-content {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-lg);
}

.footer-brand {
    gap: 0.5rem;
}

.footer-brand img {
    width: 18px;
    height: 18px;
    opacity: 0.4;
}

.footer-brand span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.footer-links {
    gap: var(--space-md);
    flex-wrap: wrap;
}

.footer-links a {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color var(--transition);
}

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

.footer-lab {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.footer-logo {
    width: 18px;
    height: 18px;
    opacity: 0.4;
}

.footer-lab span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.footer-bottom {
    padding-top: var(--space-md);
    border-top: 1px solid var(--border);
    width: 100%;
}

.footer-bottom span {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-faint);
}

/* Lab-style page header */
.page-header {
    padding: 9rem var(--space-xl) var(--space-2xl);
    border-bottom: 1px solid var(--border);
    position: relative;
}

.lab-id {
    display: flex;
    align-items: baseline;
    gap: 0.25rem;
    margin-bottom: var(--space-md);
}

.lab-id-prefix {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.15em;
}

.lab-id-num {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-faint);
}

.page-header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: var(--space-xl);
    width: 80px;
    height: 1px;
    background: var(--accent);
}

.page-header h1 {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.header-desc {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-top: var(--space-md);
    max-width: 600px;
}

/* Research layout — sidebar + list */
.research-layout {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--space-2xl);
    align-items: start;
    padding-top: var(--space-xl);
}

.research-sidebar {
    position: sticky;
    top: 100px;
}

/* Research stats — lab metrics (sidebar vertical) */
.research-stats {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    padding: var(--space-lg) 0;
    border-bottom: 1px solid var(--border);
}

.research-stat-item {
    min-width: 100px;
}

.research-stat-num {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1;
    margin-bottom: 0.25rem;
    font-variant-numeric: tabular-nums;
}

.research-stat-num::after {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    margin-left: 0.3rem;
    vertical-align: middle;
    opacity: 0.5;
}

.research-stat-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.12em;
}

/* Research list — numbered papers */
.research-list {
    display: flex;
    flex-direction: column;
    border-top: 1px solid var(--border);
}

.research-paper {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: 1.5rem;
    padding: 1.75rem 0;
    text-decoration: none;
    color: var(--text);
    border-bottom: 1px solid var(--border);
    transition: padding-left var(--transition), background var(--transition);
    position: relative;
}

.research-paper::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--accent);
    transform: scaleY(0);
    transform-origin: top;
    transition: transform var(--transition);
}

.research-paper:hover {
    padding-left: 1rem;
    background: var(--accent-soft);
}

.research-paper:hover::before {
    transform: scaleY(1);
}

.research-paper-number {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-faint);
    line-height: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: 0.25rem;
    transition: color var(--transition);
}

.research-paper:hover .research-paper-number {
    color: var(--accent);
}

.research-paper-content {
    min-width: 0;
}

.research-paper-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
}

.research-paper-date {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.research-paper-fields {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.research-field {
    padding: 0.2rem 0.6rem;
    border: 1px solid var(--border);
    border-radius: 999px;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: var(--transition);
}

.research-paper:hover .research-field {
    border-color: var(--accent);
    color: var(--accent);
}

.research-paper-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin-bottom: 0.5rem;
    transition: color var(--transition);
}

.research-paper:hover .research-paper-title {
    color: var(--accent);
}

.research-paper-abstract {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
    max-width: 800px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.research-paper-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.research-paper-link {
    color: var(--accent);
    font-weight: 700;
    transition: color var(--transition);
}

.research-empty {
    text-align: center;
    padding: var(--space-3xl) var(--space-lg);
    color: var(--text-secondary);
}

.research-empty-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
    opacity: 0.25;
    font-family: var(--font-mono);
}

.search-highlight {
    background: var(--accent-glow);
    color: var(--text);
    padding: 0 0.1em;
    border-radius: var(--radius-sm);
}

@media (max-width: 900px) {
    .page-header {
        padding: 7rem var(--space-lg) var(--space-lg);
    }

    .research-layout {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .research-sidebar {
        position: static;
    }

    .research-stats {
        flex-direction: row;
        gap: var(--space-xl);
    }

    .research-paper {
        grid-template-columns: 44px 1fr;
        gap: 1rem;
        padding: 1.25rem 0;
    }

    .research-paper-number {
        font-size: 1.25rem;
    }

    .research-paper-title {
        font-size: 1.25rem;
    }
}

@media (max-width: 640px) {
    .research-paper-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-xs);
    }

    .research-paper-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-xs);
    }
}