:root {
    --bg-deep: #050505;
    --bg-dark: #0a0b10;
    --bg-card: rgba(15, 17, 26, 0.7);
    --bg-glass: rgba(255, 255, 255, 0.03);
    --border-glass: rgba(255, 255, 255, 0.08);
    
    --accent: #d4af37; /* Academic Gold */
    --accent-glow: rgba(212, 175, 55, 0.3);
    --accent-code: #64ffda; /* Tech Cyan */
    --accent-code-glow: rgba(100, 255, 218, 0.3);
    
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-dim: #64748b;
    
    --font-serif: 'Playfair Display', serif;
    --font-sans: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    --transition: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { 
    scroll-behavior: smooth; 
    background-color: var(--bg-deep);
}

body {
    background-color: var(--bg-deep);
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Modern Gradient Background */
body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: 
        radial-gradient(circle at 0% 0%, rgba(212, 175, 55, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 100% 100%, rgba(100, 255, 218, 0.05) 0%, transparent 50%);
    z-index: -2;
}

/* Abstract Background Shapes - Refined */
.bg-shape {
    position: fixed;
    border-radius: 50%;
    filter: blur(120px);
    z-index: -1;
    opacity: 0.2;
    pointer-events: none;
}

.shape-1 {
    width: 600px; height: 600px;
    background: var(--accent);
    top: -200px; left: -100px;
    animation: float 20s infinite alternate;
}

.shape-2 {
    width: 500px; height: 500px;
    background: var(--accent-code);
    bottom: -100px; right: -100px;
    animation: float 25s infinite alternate-reverse;
}

@keyframes float {
    from { transform: translate(0, 0); }
    to { transform: translate(50px, 100px); }
}

/* Navigation - Modernized */
header {
    position: sticky;
    top: 0;
    z-index: 1000;
    width: 100%;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    background: rgba(5, 5, 5, 0.7);
    border-bottom: 1px solid var(--border-glass);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 60px;
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 1.4rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    background: linear-gradient(to bottom, #fff, #999);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    margin-left: 40px;
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px; left: 0;
    width: 0; height: 1px;
    background: var(--accent);
    transition: var(--transition);
}

.nav-links a:hover { color: var(--text-main); }
.nav-links a:hover::after { width: 100%; }

.nav-links a.active { color: var(--accent); }
.nav-links a.active::after { width: 100%; background: var(--accent); }

/* Custom Scrollbar */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { 
    background: var(--border-glass); 
    border-radius: 5px; 
    border: 3px solid var(--bg-deep);
}
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }

/* Back to Top Button */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    color: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s var(--transition);
    backdrop-filter: blur(10px);
}

#back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

#back-to-top:hover {
    transform: translateY(-5px);
    border-color: var(--accent);
    box-shadow: 0 10px 20px rgba(0,0,0,0.3);
}

/* Hero Section - Elevated */
.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    padding: 0 60px;
    max-width: 1400px;
    margin: 0 auto;
}

.hero-content {
    max-width: 900px;
}

h1 {
    font-family: var(--font-serif);
    font-size: 6.5rem; /* Slightly larger */
    line-height: 0.9;
    margin-bottom: 40px;
    letter-spacing: -3px;
    background: linear-gradient(135deg, #fff 0%, #64748b 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: heroReveal 1.2s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes heroReveal {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}

.highlight {
    font-style: italic;
    font-weight: 400;
    color: var(--accent);
    -webkit-text-fill-color: var(--accent);
    text-shadow: 0 0 30px var(--accent-glow);
    display: inline-block;
    position: relative;
}

.subtitle {
    font-size: 1.5rem;
    color: var(--text-muted);
    margin-bottom: 60px;
    max-width: 650px;
    line-height: 1.4;
    font-weight: 300;
}

.cta-button {
    display: inline-block;
    padding: 18px 45px;
    border: 1px solid var(--accent);
    color: var(--accent);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: all 0.4s var(--transition);
    background: transparent;
    border-radius: 2px;
}

.cta-button:hover {
    background: var(--accent);
    color: var(--bg-deep);
    box-shadow: 0 0 40px var(--accent-glow);
    transform: translateY(-2px);
}

.cta-button + .cta-button {
    margin-left: 24px;
    border-color: var(--accent-code);
    color: var(--accent-code);
}

.cta-button + .cta-button:hover {
    background: var(--accent-code);
    color: var(--bg-deep);
    box-shadow: 0 0 40px var(--accent-code-glow);
}

/* Sections Global */
.work-section {
    padding: 120px 60px;
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    margin-bottom: 80px;
    border-bottom: 1px solid var(--border-glass);
    padding-bottom: 30px;
}

.section-header h2 {
    font-family: var(--font-serif);
    font-size: 3.5rem;
    font-weight: 400;
    letter-spacing: -1px;
}

/* Research Specific Section */
#work .section-header h2 {
    color: #fff;
}

/* Code Specific Section */
.code-section {
    background: radial-gradient(circle at 50% 50%, rgba(100, 255, 218, 0.03) 0%, transparent 100%);
    border-radius: 40px;
    margin: 40px auto;
}

.code-section .section-header h2 {
    font-family: var(--font-sans);
    font-weight: 700;
    letter-spacing: -2px;
}

/* Grid & Cards - Modernized */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(420px, 1fr));
    gap: 30px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    padding: 50px;
    position: relative;
    transition: all 0.5s var(--transition);
    backdrop-filter: blur(20px);
    display: flex;
    flex-direction: column;
    min-height: 440px;
    text-decoration: none;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 1px;
    background: linear-gradient(to right, transparent, var(--border-glass), transparent);
}

.card:hover {
    transform: translateY(-12px);
    border-color: var(--accent);
    background: rgba(20, 22, 30, 0.9);
    box-shadow: 0 30px 60px -20px rgba(0,0,0,0.5), 0 0 20px -5px var(--accent-glow);
}

.code-card:hover {
    border-color: var(--accent-code);
    box-shadow: 0 30px 60px -20px rgba(100, 255, 218, 0.1), 0 0 20px -5px var(--accent-code-glow);
}

.card-category {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--accent);
    margin-bottom: 30px;
    opacity: 0.8;
}

.code-card .card-category {
    color: var(--accent-code);
}

.card h3 {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    color: #fff;
    margin-bottom: 20px;
    line-height: 1.1;
    font-weight: 400;
}

.code-card h3 {
    font-family: var(--font-sans);
    font-weight: 700;
    letter-spacing: -0.5px;
}

.card p {
    color: var(--text-muted);
    font-size: 1.05rem;
    margin-bottom: 40px;
    line-height: 1.6;
}

.card-link {
    margin-top: auto;
    color: #fff;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 600;
    display: flex;
    align-items: center;
    transition: var(--transition);
}

.card-link::after { 
    content: '→'; 
    margin-left: 12px; 
    transition: var(--transition);
    color: var(--accent);
}

.card:hover .card-link::after { 
    transform: translateX(10px); 
}

.code-card .card-link::after {
    color: var(--accent-code);
}

/* About Section - Modernized */
.about-section {
    padding: 150px 60px;
    position: relative;
}

.about-container {
    max-width: 1000px;
    margin: 0 auto;
}

.about-header-centered h2 {
    font-family: var(--font-serif);
    font-size: 4rem;
    margin-bottom: 80px;
    text-align: center;
}

.about-narrative .lead {
    font-size: 1.8rem;
    line-height: 1.4;
    color: #fff;
    font-family: var(--font-serif);
    margin-bottom: 60px;
    border-left: 4px solid var(--accent);
    padding-left: 40px;
    font-style: italic;
}

.about-narrative p {
    color: var(--text-muted);
    font-size: 1.15rem;
    margin-bottom: 30px;
    max-width: 800px;
}

.about-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 100px;
    margin-top: 100px;
    padding-top: 80px;
    border-top: 1px solid var(--border-glass);
}

.info-column h3 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--accent);
    margin-bottom: 40px;
}

.info-column li {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: var(--text-main);
    display: flex;
    align-items: center;
}

.info-column li::before {
    content: '';
    width: 6px; height: 1px;
    background: var(--accent);
    margin-right: 15px;
}

.tags li {
    display: inline-block;
    border: 1px solid var(--border-glass);
    padding: 10px 20px;
    margin-right: 12px;
    margin-bottom: 12px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    transition: var(--transition);
    background: rgba(255,255,255,0.01);
}

.tags li:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(212, 175, 55, 0.05);
}

/* Footer */
footer {
    padding: 100px 60px;
    text-align: center;
    border-top: 1px solid var(--border-glass);
}

.social-links a {
    color: var(--text-muted);
    margin: 0 25px;
    text-decoration: none;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: var(--transition);
}

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

.copyright { 
    margin-top: 50px; 
    font-size: 0.75rem; 
    color: var(--text-dim); 
    letter-spacing: 1px;
}

/* --- Global Animation Classes --- */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 1.2s var(--transition), transform 1.2s var(--transition);
    will-change: opacity, transform;
}

.visible {
    opacity: 1 !important;
    transform: translateY(0) !important;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Mobile Navigation Toggle Styles */
.mobile-nav-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1001;
}

.hamburger {
    display: block;
    position: relative;
    width: 24px;
    height: 2px;
    background: var(--text-main);
    transition: background 0.3s;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: var(--text-main);
    transition: transform 0.3s;
}

.hamburger::before { top: -8px; left: 0; }
.hamburger::after { bottom: -8px; left: 0; }

.mobile-nav-toggle.is-active .hamburger {
    background: transparent;
}

.mobile-nav-toggle.is-active .hamburger::before {
    transform: translateY(8px) rotate(45deg);
}

.mobile-nav-toggle.is-active .hamburger::after {
    transform: translateY(-8px) rotate(-45deg);
}

body.nav-open {
    overflow: hidden;
}

/* Mobile Responsiveness */
@media (max-width: 1024px) {
    h1 { font-size: 4.5rem; }
    .grid { grid-template-columns: repeat(auto-fill, minmax(350px, 1fr)); }
    .hero, .work-section, .about-section { padding: 80px 40px; }
    nav { padding: 20px 40px; }
}

@media (max-width: 768px) {
    .mobile-nav-toggle {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background: var(--bg-deep);
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: right 0.4s var(--transition);
        z-index: 1000;
        backdrop-filter: blur(20px);
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links a {
        margin: 20px 0;
        font-size: 1.2rem;
    }

    h1 { font-size: 3.2rem; letter-spacing: -1px; }
    .subtitle { font-size: 1.1rem; margin-bottom: 40px; }
    
    .cta-button { 
        width: 100%; 
        text-align: center;
        margin-bottom: 15px;
    }
    
    .cta-button + .cta-button {
        margin-left: 0;
    }

    .hero { min-height: 80vh; padding-top: 120px; }

    .about-header-centered h2 { font-size: 2.8rem; margin-bottom: 40px; }
    .about-narrative .lead { font-size: 1.4rem; padding-left: 20px; margin-bottom: 40px; }
    .about-narrative p { font-size: 1rem; }
    
    .about-info-grid { 
        grid-template-columns: 1fr; 
        gap: 60px; 
        margin-top: 60px;
        padding-top: 60px;
    }

    .section-header h2 { font-size: 2.5rem; }
    
    .grid { grid-template-columns: 1fr; }
    .card { padding: 30px; min-height: auto; }
    .card h3 { font-size: 1.8rem; }
    
    footer { padding: 60px 20px; }
    .social-links a { margin: 0 15px; display: inline-block; margin-bottom: 10px; }
}

@media (max-width: 480px) {
    h1 { font-size: 2.5rem; }
    .hero, .work-section, .about-section { padding: 60px 20px; }
    nav { padding: 15px 20px; }
    .logo { font-size: 1.1rem; }
    
    .about-header-centered h2 { font-size: 2.2rem; }
    .about-narrative .lead { font-size: 1.2rem; }
}