:root {
    --primary-color: #4A6FA5;
    --primary-color-dark: #3A5F95;
    --background-color: #FFFFFF;
    --section-highlight-bg: #F8F9FA;
    --text-color: #343A40;
    --text-color-light: #6C757D;
    --heading-color: #212529;
    --border-color: #DEE2E6;
    --card-shadow: 0 4px 12px rgba(0,0,0,0.05);
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    font-family: var(--font-family);
    color: var(--text-color);
    background-color: var(--background-color);
    margin: 0;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

h1, h2, h3, h4 {
    color: var(--heading-color);
    font-weight: 700;
}

p {
    color: var(--text-color-light);
}

/* --- Navigation Bar --- */
.main-nav {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}
.main-nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--heading-color);
    font-weight: 600;
    font-size: 1.2rem;
    font-family: 'SF Mono', 'Fira Code', 'Menlo', monospace;
}
.nav-links {
    display: flex;
    gap: 25px;
    align-items: center;
}
.nav-links a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.2s;
}
.nav-links a svg { flex-shrink: 0; }
.nav-links a:hover {
    color: var(--primary-color);
}

/* --- Hero Section --- */
.hero {
    background: linear-gradient(150deg, #e8eff8, #f0f5fc);
    padding: 80px 0;
}
.hero-layout {
    display: flex;
    align-items: center;
    gap: 50px;
}
.profile-picture {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
    background: #d0daea;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}
.profile-picture img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.profile-initials {
    display: none;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color-dark);
    letter-spacing: 0.05em;
}
.profile-picture.placeholder .profile-initials {
    display: block;
}
h1 {
    font-size: 2.2rem;
    line-height: 1.2;
    margin: 0 0 6px;
}
.hero-subtitle {
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--primary-color-dark);
    margin: 0 0 16px;
}
.hero-tagline {
    font-size: 1rem;
    max-width: 600px;
    margin: 0 0 12px;
    color: var(--text-color-light);
    line-height: 1.7;
}
.hero-tagline:last-of-type {
    margin-bottom: 20px;
}
.hero-tagline a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}
.hero-tagline a:hover {
    text-decoration: underline;
}
.hero-pills {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}
.hero-pill {
    display: inline-block;
    padding: 5px 14px;
    font-size: 0.825rem;
    font-weight: 500;
    color: var(--primary-color-dark);
    background: rgba(74, 111, 165, 0.08);
    border: 1px solid rgba(74, 111, 165, 0.25);
    border-radius: 20px;
    letter-spacing: 0.01em;
}

/* --- General Sections --- */
.section { padding: 80px 0; }
.section-highlight { background-color: var(--section-highlight-bg); }
.section-header {
    text-align: center;
    margin-bottom: 50px;
}
.section-header h2 {
    font-size: 2.2rem;
    margin-bottom: 12px;
}
.section-header p {
    font-size: 1.05rem;
    max-width: 600px;
    margin: 0 auto;
}

/* --- Projects Section --- */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}
.project-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 28px;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    position: relative;
    cursor: pointer;
}
.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow);
    border-color: #ccc;
}
.project-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}
.project-header h3 {
    margin: 0;
    font-size: 1.3rem;
    font-family: 'SF Mono', 'Fira Code', 'Menlo', monospace;
}
.project-badge {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-color-light);
    background: var(--section-highlight-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2px 10px;
}
.project-card > p {
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0 0 16px;
    flex: 1;
}
.motivation-block {
    margin-bottom: 40px;
}
.motivation-block h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--heading-color);
}
.motivation-item {
    font-size: 0.9rem;
    font-style: italic;
    color: var(--text-color-light);
    line-height: 1.7;
    margin-bottom: 12px;
}
.motivation-item strong {
    font-style: normal;
    color: var(--text-color);
}
.project-card-link {
    color: inherit;
    text-decoration: none;
}
.project-card-link::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 12px;
}
.project-logo {
    flex-shrink: 0;
}
.project-ecosystem {
    margin-bottom: 18px;
    line-height: 2;
    position: relative;
    z-index: 1;
}
.project-ecosystem code {
    background: var(--section-highlight-bg);
    border-radius: 5px;
    padding: 3px 8px;
    font-size: 0.8rem;
    color: var(--text-color);
    white-space: nowrap;
    margin-right: 4px;
    transition: all 0.2s;
}
.ecosystem-link {
    text-decoration: none;
    color: inherit;
}
.ecosystem-link:hover code {
    background: rgba(74, 111, 165, 0.12);
    color: var(--primary-color-dark);
}
.coming-soon-badge {
    display: inline-block;
    padding: 2px 8px;
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--primary-color-dark);
    background: rgba(74, 111, 165, 0.1);
    border: 1px solid rgba(74, 111, 165, 0.3);
    border-radius: 10px;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    vertical-align: middle;
}
.project-highlight-link {
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}
.project-highlight-link a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--primary-color);
    text-decoration: none;
    padding: 5px 12px;
    background: rgba(74, 111, 165, 0.06);
    border: 1px solid rgba(74, 111, 165, 0.2);
    border-radius: 8px;
    transition: all 0.2s;
}
.project-highlight-link a:hover {
    background: rgba(74, 111, 165, 0.12);
    border-color: rgba(74, 111, 165, 0.35);
}
.project-highlight-link a svg {
    flex-shrink: 0;
}
.project-arrow-demo {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 16px;
    padding: 8px 0;
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.02);
    overflow: hidden;
}
.project-arrow-demo object {
    height: 56px;
    width: auto;
}
.project-links {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    position: relative;
    z-index: 1;
}
.project-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color-light);
    text-decoration: none;
    padding: 6px;
    border-radius: 6px;
    transition: all 0.2s;
}
.project-link:hover {
    color: var(--primary-color);
    background: rgba(74, 111, 165, 0.06);
}
.project-link img {
    display: block;
}

/* --- Publications Section --- */
.publications-list {
    max-width: 750px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.publication-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px 28px;
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
    display: block;
}
.publication-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--card-shadow);
    border-color: #ccc;
}
.publication-type {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--primary-color);
    margin-bottom: 8px;
}
.publication-card h4 {
    margin: 0 0 8px;
    font-size: 1.05rem;
    font-weight: 600;
    line-height: 1.4;
}
.publication-meta {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-color-light);
}

/* --- Footer --- */
footer {
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-color-light);
    font-size: 0.9rem;
}
.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.footer-links {
    display: flex;
    align-items: center;
    gap: 20px;
}
.footer-link {
    color: var(--text-color-light);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}
.footer-link:hover {
    color: var(--primary-color);
}
.footer-icon-link {
    display: inline-flex;
    align-items: center;
}
.footer-icon-link svg {
    fill: var(--text-color-light);
    transition: fill 0.2s;
}
.footer-icon-link:hover svg {
    fill: var(--primary-color);
}

/* --- Responsive --- */
@media (max-width: 768px) {
    h1 { font-size: 1.8rem; }
    .nav-links a:not([title]) { display: none; }
    .hero { padding: 50px 0; }
    .hero-layout {
        flex-direction: column;
        text-align: center;
    }
    .hero-tagline { max-width: none; }
    .hero-pills { justify-content: center; }
    .section { padding: 60px 0; }
    .section-header h2 { font-size: 1.8rem; }
    .projects-grid {
        grid-template-columns: 1fr;
    }
    .footer-content {
        flex-direction: column;
        gap: 16px;
    }
}