/* Quantum - Post-Quantum Cryptography Research */
/* Light Academic Theme */

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-card: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a5a;
    --text-muted: #6c757d;
    --accent-primary: #4169E1;    /* RoyalBlue */
    --accent-secondary: #5a7fd4;
    --accent-tertiary: #2c4a8c;
    --border-color: #dee2e6;
    --border-light: #e9ecef;
    --success: #198754;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-serif: 'Crimson Pro', 'Georgia', serif;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
}

/* Navigation */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    background: var(--bg-primary);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: var(--accent-primary);
    border-radius: 6px;
    font-weight: 700;
    font-size: 1.1rem;
    color: white;
}

.brand-text {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
}

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

/* Hero Section */
.hero {
    padding: 8rem 5% 4rem;
    text-align: center;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

.hero h1 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 1.5rem;
    font-family: var(--font-serif);
}

.hero-badges {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.badge {
    padding: 0.4rem 0.9rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.8rem;
    font-family: var(--font-mono);
    color: var(--accent-primary);
}

/* Papers Section */
.papers-section {
    padding: 4rem 5%;
    max-width: 900px;
    margin: 0 auto;
}

.papers-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--accent-primary);
    font-weight: 600;
}

.paper-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.75rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s, border-color 0.2s;
}

.paper-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--accent-primary);
}

.paper-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.paper-status {
    background: rgba(65, 105, 225, 0.1);
    color: var(--accent-primary);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.paper-date {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.paper-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.paper-abstract {
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    font-family: var(--font-serif);
    font-size: 1rem;
}

.paper-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 1.25rem;
}

.tech-tag {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    padding: 0.2rem 0.6rem;
    border-radius: 3px;
    font-size: 0.7rem;
    font-family: var(--font-mono);
    color: var(--text-secondary);
}

.paper-links {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.paper-source {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-light);
    font-size: 0.85rem;
}

.paper-source a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

.paper-source a:hover {
    color: var(--accent-primary);
}

.paper-source .separator {
    color: var(--border-color);
    margin: 0 0.75rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s;
    font-size: 0.9rem;
}

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

.btn-primary:hover {
    background: var(--accent-tertiary);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* About Section */
.about-section {
    padding: 4rem 5%;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.about-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    text-align: center;
    color: var(--accent-primary);
    font-weight: 600;
}

.about-content {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 2.5rem;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    font-family: var(--font-serif);
    font-size: 1rem;
}

.about-text h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.about-text ul {
    list-style: none;
}

.about-text li {
    color: var(--text-secondary);
    padding: 0.4rem 0;
    padding-left: 1.25rem;
    position: relative;
    font-size: 0.95rem;
}

.about-text li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 5px;
    height: 5px;
    background: var(--accent-primary);
    border-radius: 50%;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.25rem;
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--accent-primary);
    line-height: 1;
    margin-bottom: 0.3rem;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* CTA Section */
.cta-section {
    padding: 4rem 5%;
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-section h2 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.cta-section p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-family: var(--font-serif);
}

/* Footer */
footer {
    padding: 2rem 5%;
    border-top: 1px solid var(--border-color);
    background: var(--bg-primary);
}

.footer-content {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.footer-brand .logo {
    width: 28px;
    height: 28px;
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

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

.footer-legal {
    width: 100%;
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-light);
    margin-top: 0.5rem;
}

.footer-legal p {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar {
        padding: 0.75rem 5%;
    }

    .nav-links {
        gap: 1rem;
        font-size: 0.9rem;
    }

    .hero {
        padding: 7rem 5% 3rem;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .about-stats {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }

    .stat-card {
        flex: 1;
        min-width: 120px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .paper-links {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }
}

/* Code blocks */
pre, code {
    font-family: var(--font-mono);
    background: var(--bg-secondary);
    border-radius: 4px;
}

code {
    padding: 0.15rem 0.35rem;
    font-size: 0.85rem;
    color: var(--accent-tertiary);
}

pre {
    padding: 1rem;
    overflow-x: auto;
    border: 1px solid var(--border-color);
    font-size: 0.85rem;
}

/* Print styles */
@media print {
    .navbar, footer, .cta-section {
        display: none;
    }

    body {
        background: white;
    }

    .hero {
        padding-top: 2rem;
    }
}