/* ========================================
   CSS Variables & Theme
   ======================================== */
:root {
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', 'Courier New', monospace;
    --max-width: 1100px;
    --transition: 0.2s ease;
}

/* Light theme */
html {
    --bg: #f5f3f9;
    --bg-card: #ffffff;
    --text-primary: #110b20;
    --text-secondary: #302848;
    --text-muted: #564c78;
    --border: #d6d0e2;
    --accent: #7c3aed;
    --accent-hover: #6d28d9;
    --epfl-red: #dc2626;
    --nav-bg: rgba(245, 243, 249, 0.88);
    --card-bg: #ffffff;
    --card-border: #d6d0e2;
    --hero-title-muted: #9688b8;
    --image-border: #8b5cf6;
    --image-glow: rgba(139, 92, 246, 0.25);
}

/* Dark theme */
html.dark {
    --bg: #0d0a14;
    --bg-card: #141020;
    --text-primary: #f0ecf8;
    --text-secondary: #cdc6e0;
    --text-muted: #9a90b8;
    --border: #221c38;
    --accent: #b49bff;
    --accent-hover: #d0c0ff;
    --epfl-red: #ef4444;
    --nav-bg: rgba(13, 10, 20, 0.88);
    --card-bg: #120e1e;
    --card-border: #261e40;
    --hero-title-muted: #4a3d78;
    --image-border: #7c3aed;
    --image-glow: rgba(139, 92, 246, 0.3);
}

/* ========================================
   Reset & Base
   ======================================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 72px;
}

body {
    font-family: var(--font-mono);
    background: var(--bg);
    color: var(--text-primary);
    line-height: 1.7;
    transition: background var(--transition), color var(--transition);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-size: 16px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: background var(--transition), border-color var(--transition);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 1.25rem;
}

.nav-name {
    font-weight: 600;
    color: var(--text-primary);
}

.nav-separator {
    color: var(--text-muted);
    font-size: 1rem;
}

.nav-role {
    color: var(--text-muted);
    font-size: 1rem;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    display: flex;
    gap: 0;
}

.nav-link {
    padding: 0.4rem 1rem;
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition);
}

.nav-link:hover {
    color: var(--text-primary);
    text-decoration: none;
}

.nav-link.active {
    color: var(--accent);
    border-bottom: 2px solid var(--accent);
    padding-bottom: calc(0.4rem - 2px);
}

.nav-link-disabled {
    cursor: default;
    opacity: 0.45;
    pointer-events: none;
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color var(--transition);
    margin-left: 0.25rem;
}

.theme-toggle:hover {
    color: var(--text-primary);
}

html.dark .icon-sun { display: block; }
html.dark .icon-moon { display: none; }
html:not(.dark) .icon-sun { display: none; }
html:not(.dark) .icon-moon { display: block; }

/* ========================================
   Layout
   ======================================== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
    padding-top: 56px;
}

/* ========================================
   Hero / Profile Section
   ======================================== */
.hero-section {
    padding: 3.5rem 0 2.5rem;
}

.hero-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 3rem;
}

.hero-text {
    flex: 1;
    min-width: 0;
}

.hero-name {
    font-size: 3.6rem;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 0;
    min-height: 1.15em;
}

.hero-prompt {
    color: var(--accent);
    font-weight: 400;
    margin-right: -0.15em;
}

.typing-cursor-static {
    position: absolute;
    font-weight: 400;
    color: var(--accent);
    pointer-events: none;
    transform: translateX(-50%);
}

.typing-cursor {
    animation: blink 0.6s step-end infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.hero-title {
    font-size: 3.75rem;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--hero-title-muted);
    margin-bottom: 1.5rem;
}

.hero-bio {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 580px;
    margin-bottom: 1.75rem;
    margin-top: 1.25rem;
}

#hero-greeting {
    display: inline-block;
    width: 5ch;
}

.hero-bio em {
    color: var(--text-primary);
    font-style: italic;
    font-weight: 600;
}

.epfl-link {
    color: var(--epfl-red) !important;
    font-weight: 600;
    text-decoration: none;
}

.epfl-link:hover {
    text-decoration: underline;
    color: var(--epfl-red) !important;
}

.hero-buttons {
    display: flex;
    gap: 0.75rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 1.1rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    border-radius: 6px;
    text-decoration: none;
    transition: all var(--transition);
}

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

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    text-decoration: none;
}

.btn-scholar {
    border: 1px solid var(--accent);
    background: #ffffff;
    color: var(--accent);
}

html.dark .btn-scholar {
    background: #ffffff;
    color: #7c3aed;
    border-color: #7c3aed;
}

html:not(.dark) .btn-scholar {
    background: #ffffff;
    color: #7c3aed;
    border-color: #7c3aed;
}

.btn-scholar:hover {
    background: var(--accent);
    color: #ffffff;
    text-decoration: none;
}

html.dark .btn-scholar:hover {
    background: #7c3aed;
    color: #ffffff;
    border-color: #7c3aed;
}

.hero-image-wrapper {
    flex-shrink: 0;
    position: relative;
    padding: 4px;
    border-radius: 0;
    background: linear-gradient(135deg, var(--image-border), rgba(139, 92, 246, 0.4), var(--image-border));
    box-shadow: 0 0 24px var(--image-glow), 0 0 48px rgba(139, 92, 246, 0.1);
    transition: box-shadow var(--transition);
}

.hero-image-wrapper:hover {
    box-shadow: 0 0 32px var(--image-glow), 0 0 64px rgba(139, 92, 246, 0.15);
}

.hero-image {
    display: block;
    width: 240px;
    height: 240px;
    object-fit: cover;
    border-radius: 0;
    border: none;
}

/* ========================================
   Two-Column Section (News + Papers)
   ======================================== */
.two-col-section {
    padding: 1rem 0 3rem;
}

.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

/* ========================================
   News Section
   ======================================== */
.news-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.news-item {
    padding: 0.85rem 0 0.85rem 1.25rem;
    border-left: 2px solid var(--border);
    transition: border-color var(--transition);
    margin-bottom: 0.6rem;
}

.news-date {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.35rem;
}

.news-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   Papers / Selected Work
   ======================================== */
.papers-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.paper-card {
    display: block;
    padding: 1.25rem 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--card-border);
    background: var(--card-bg);
    transition: border-color var(--transition), background var(--transition);
    text-decoration: none;
}

.paper-card:hover {
    border-color: var(--accent);
    text-decoration: none;
}

.paper-title {
    font-size: 1.125rem;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 0.4rem;
    color: var(--text-primary);
}

.paper-description {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.65;
}

.paper-meta {
    font-size: 0.875rem;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.paper-readmore {
    display: inline-block;
    margin-top: 0.75rem;
    font-size: 0.825rem;
    font-weight: 500;
    color: var(--accent);
}

.paper-card:hover .paper-readmore {
    text-decoration: underline;
}

.paper-authors {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ========================================
   About Section
   ======================================== */
.about-section {
    padding: 2.5rem 0 3rem;
    border-top: 1px solid var(--border);
}

.about-content {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 720px;
}

.about-content p + p {
    margin-top: 1rem;
}

.about-content em {
    color: var(--text-primary);
}

.institution-link {
    color: var(--accent) !important;
    font-weight: 600;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    border-top: 1px solid var(--border);
    transition: border-color var(--transition);
    background: var(--bg);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1.5rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-copy {
    font-size: 0.95rem;
    color: var(--text-muted);
}

.footer-inspiration {
    font-size: 0.75rem;
}

.footer-social {
    display: flex;
    gap: 1.1rem;
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--text-muted);
    transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.footer-social a svg {
    width: 18px;
    height: 18px;
}

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

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
    .hero-content {
        flex-direction: column-reverse;
        align-items: center;
        text-align: center;
    }

    .hero-name,
    .hero-title {
        font-size: 2.25rem;
    }

    .hero-bio {
        max-width: 100%;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-image {
        width: 170px;
        height: 170px;
    }

    .two-col {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .nav-brand {
        display: none;
    }

    .footer-container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}