:root {
    --bg-color: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --accent-color: #2563eb;
    --accent-hover: #1d4ed8;
    --border-color: #e2e8f0;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-color);
    line-height: 1.6;
}

/* Typography */
h1, h2, h3 { font-weight: 700; }
a { color: var(--accent-color); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-hover); }

/* Layout Container */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
nav {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(5px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}
.nav-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo { font-weight: 700; font-size: 1.2rem; color: var(--text-primary); }
.nav-links { list-style: none; display: flex; gap: 1.5rem; align-items: center; }
.nav-links a { color: var(--text-secondary); font-weight: 500; }
.nav-links a:hover { color: var(--accent-color); }
.btn-cv {
    background: var(--accent-color);
    color: white !important;
    padding: 0.5rem 1rem;
    border-radius: 6px;
}
.btn-cv:hover { background: var(--accent-hover); }

/* Hero Section */
.hero {
    display: flex;
    align-items: center;
    gap: 3rem;
    padding: 6rem 0;
}
.hero-content { flex: 1; }
.hero h1 { font-size: 2.5rem; margin-bottom: 0.5rem; }
.hero .subtitle { color: var(--text-secondary); font-size: 1.2rem; margin-bottom: 1.5rem; font-weight: 400; }
.hero-image img {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--border-color);
}
.social-links { display: flex; gap: 1rem; margin-top: 1.5rem; }
.social-links a {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

/* Sections */
.section { padding: 4rem 0; border-top: 1px solid var(--border-color); }
.section-title { font-size: 1.8rem; margin-bottom: 2rem; }

/* Publications */
.pub-item { display: flex; gap: 2rem; margin-bottom: 2rem; }
.pub-year { font-weight: 600; color: var(--text-secondary); width: 60px; }
.pub-details h3 { font-size: 1.1rem; margin-bottom: 0.3rem; }
.pub-details .authors { color: var(--text-primary); margin-bottom: 0.2rem; font-size: 0.95rem; }
.pub-details .venue { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 0.8rem; }
.pub-links { display: flex; gap: 1rem; font-size: 0.85rem; }
.pub-links a { display: flex; align-items: center; gap: 0.3rem; }

/* Grid (Projects) */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }
.card {
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: 8px;
    transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); }
.card h3 { margin-bottom: 0.5rem; }
.card p { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 1rem; }
.card-link { font-size: 0.9rem; font-weight: 600; }

/* Footer */
footer { text-align: center; padding: 2rem; color: var(--text-secondary); font-size: 0.9rem; border-top: 1px solid var(--border-color); }

/* Responsive */
@media (max-width: 768px) {
    .hero { flex-direction: column-reverse; text-align: center; }
    .social-links { justify-content: center; }
    .pub-item { flex-direction: column; gap: 0.5rem; }
    .nav-links { display: none; /* Add JS toggle for mobile menu if desired */ }
}