* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body { font-family: 'Georgia', 'Times New Roman', serif; line-height: 1.8; color: #2c3e50; background-color: #fff; }

        /* ── HEADER ── */
        header { background-color: #fff; border-bottom: 1px solid #e0e0e0; position: fixed; top: 0; left: 0; right: 0; z-index: 1000; }
        .header-content { max-width: 1100px; margin: 0 auto; padding: 1.5rem 30px; display: flex; justify-content: space-between; align-items: center; }
        .site-title { font-size: 1.8rem; font-weight: 600; color: #2c3e50; }
        .site-title a { text-decoration: none; color: inherit; }
        nav ul { list-style: none; display: flex; gap: 2rem; }
        nav a { text-decoration: none; color: #555; font-size: 1rem; transition: color 0.3s; }
        nav a:hover, nav a.active { color: #2c3e50; }

        /* ── PAGE LAYOUT (matches research.html) ── */
        .page-layout {
            display: flex;
            max-width: 1100px;
            margin: 0 auto;
            padding: 0;
        }

        /* ── SIDEBAR ── */
        .sidebar {
            width: 260px;
            padding: 30px;
            padding-top: 8rem;
            position: sticky;
            top: 0;
            height: 100vh;
            flex-shrink: 0;
        }

        .profile-photo {
            width: 170px;
            height: auto;
            border-radius: 4px;
            margin-bottom: 14px;
            display: block;
        }

        .sidebar h2 { font-size: 1.15rem; font-weight: 600; margin-bottom: 0.15rem; }
        .sidebar .subtitle { font-size: 0.9rem; color: #666; margin-bottom: 0.6rem; }

        .contact-icons { display: flex; flex-direction: row; gap: 0.8rem; margin-top: 0.4rem; }
        .contact-icon { width: 30px; height: 30px; flex-shrink: 0; }

        /* ── MAIN CONTENT ── */
        .content {
            flex: 1;
            padding: 40px;
            padding-top: 8rem;
            max-width: 800px;
        }

        /* ── SECTIONS ── */
        section { margin-bottom: 4rem; scroll-margin-top: 100px; }
        section h2 { font-size: 1.8rem; font-weight: 600; margin-bottom: 2rem; color: #2c3e50; padding-bottom: 0.5rem; border-bottom: 1px solid #e0e0e0; }

        /* ── ABOUT / INTRO TEXT ── */
        .content p { font-size: 1.05rem; line-height: 1.8; margin-bottom: 1rem; text-align: justify; }
        .content a { color: #3498db; text-decoration: none; }
        .content a:hover { text-decoration: underline; }

        /* ── PAPER ITEMS ── */
        .paper-item { margin-bottom: 1rem; padding-bottom: 1rem; border-bottom: 1px solid #f0f0f0; }
        .paper-item:last-child { border-bottom: none; }
        .paper-title { font-size: 1.1rem; font-weight: 400; color: #2c3e50; margin-bottom: 0.5rem;}/*{ font-size: 1.2rem; font-weight: 600; color: #2c3e50; margin-bottom: 0.5rem; }*/
        .paper-authors { color: #666; font-size: 0.95rem; margin-bottom: 0.8rem; }
        .paper-authors a { color: #3498db; text-decoration: none; }
        .paper-authors a:hover { text-decoration: underline; }
        .paper-links { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 1rem; }
        .paper-link { color: #3498db; text-decoration: none; font-size: 0.95rem; padding: 0.4rem 0; border-bottom: 1px solid transparent; }
        .paper-link:hover { border-bottom-color: #3498db; }
        .paper-abstract { color: #555; font-size: 1rem; line-height: 1.8; text-align: justify; }
        .abstract-toggle { color: #3498db; cursor: pointer; margin-bottom: 0.5rem; display: inline-block; }
        .arrow-right {
                     width: 0; 
                         height: 0; 
                         border-top: 5px solid transparent; 
                         border-bottom: 5px solid transparent; 
                         border-left: 7px solid #3498db;
                         display: inline-block;
                         transition: transform 0.2s ease-in-out; /* Smooth rotation */
        }
        .abstract {
         display: none;
         margin-top: 5px;
         font-size: 0.95em;
         color: #444;
         background-color: #f9f9f9;
         padding: 10px;
         border-left: 3px solid #007acc;
       }
       /* 1. Rotates arrow 90 degrees downward when hovering */
       .paper-item:hover .arrow-right {
           transform: rotate(90deg);
       }
        .paper-item:hover .abstract {
          display: block;
        }
        /* ── CONTACT ── */
        .contact-info { background-color: #2c3e50; color: white; padding: 2rem 1.5rem; border-radius: 8px; margin-bottom: 3rem; }
        .contact-info p { color: white; margin-bottom: 0.8rem; font-size: 1.05rem; line-height: 1.8; text-align: left; }
        .contact-email { color: white; text-decoration: underline; }

        /* ── FOOTER ── */
        footer { max-width: 1100px; margin: 4rem auto 0; padding: 2rem 30px; text-align: center; border-top: 1px solid #e0e0e0; color: #999; font-size: 0.9rem; }

        /* ── MOBILE ── */
        .menu-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: #2c3e50; }
@media (max-width: 768px) {
    .header-content {
        padding: 1rem;
    }

    .menu-toggle {
        display: block;
    }

    nav ul {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        display: none;
        gap: 0;
    }

    nav ul.active {
        display: flex;
    }

    nav li {
        padding: 0.8rem 0;
        border-bottom: 1px solid #f0f0f0;
    }

    /* MOBILE PROFILE PHOTO */
    .sidebar {
        display: block;
        width: 100%;
        height: auto;
        position: static;
        padding: 6rem 20px 1rem;
        text-align: center;
    }

    .profile-photo {
        width: 150px;
        height: auto;
        margin: 0 auto 7px;
        margin-bottom: 1rem;
    }

    .sidebar h2 {
        font-size: 1.2rem;
    }

    .sidebar .subtitle {
        font-size: 0.9rem;
    }

    .contact-icons {
        justify-content: center;
    }

    .page-layout {
        flex-direction: column;
    }
    .content {
        padding: 0.5rem 20px 3rem;
    }

    .content p {
    font-size: 1rem;
    line-height: 1.7;
    text-align: justify;
    margin-bottom: 1rem;
}
    section h2 {
        font-size: 1.5rem;
    }
}  
@media (hover: hover) and (pointer: fine) {
    .paper-item:hover .arrow-right {
        transform: rotate(90deg);
    }
    
    .paper-item:hover .abstract {
        display: block;
    }
}

/* On mobile (touch screens), show when toggled active via click */
.paper-item.active .arrow-right {
    transform: rotate(90deg);
}

.paper-item.active .abstract {
    display: block;
}


        /* @media (max-width: 768px) {
            .header-content { padding: 1rem; }
            .menu-toggle { display: block; }
            nav ul { position: absolute; top: 100%; left: 0; right: 0; background: #fff; flex-direction: column; padding: 1rem; box-shadow: 0 4px 8px rgba(0,0,0,0.1); display: none; gap: 0; }
            nav ul.active { display: flex; }
            nav li { padding: 0.8rem 0; border-bottom: 1px solid #f0f0f0; }
            .sidebar { display: none; }
            .page-layout { flex-direction: column; }
            .content { padding: 6rem 20px 3rem; max-width: 100%; }
            section h2 { font-size: 1.5rem; }
        } */