html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Work Sans', 'Segoe UI', Arial, sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    background-image: linear-gradient( rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3) ), url('Pictures/Wallpaper.png');
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    background-attachment: fixed;
    line-height: 1.6;
    color: #fff;
}

header {
    background-color: rgba(0, 0, 0, 0.5);
    padding: 20px;
    max-width: 60%;
    text-align: center;
    margin: 0 auto;
    border-radius: 10px;
}

h1, h2, h3 {
    color: #fdfdfd;
    font-family: 'Work Sans', 'Segoe UI', Arial, sans-serif;
    font-weight: 700;
    letter-spacing: 0.3px;
    text-shadow: 1px 2px 8px #222;
    margin-top: 32px;
    margin-bottom: 16px;
    scroll-margin-top: 110px;
}

h2 {
    text-decoration: underline;
    text-underline-offset: 6px;
}

nav {
    display: flex;
    justify-content: center;
    max-width: 60%;
    background-color: rgba(0, 0, 0, 0.9);
    padding: 10px 0;
    margin: 0 auto;
    position: sticky;
    top: 0;
    z-index: 10;
}

section {
    padding: 20px;
    background-color: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(4px);
    max-width: 60%;
    margin: 0 auto;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

section:first-child {
    margin-top: 50px;
}

img {
    max-width: 100%;
    display: block;
    margin: 0 auto;
    margin-bottom: 20px;
}

img.profile-pic {
    max-width: 260px;
    height: auto;
    display: block;
    margin: 0 auto;
    margin-bottom: 20px;
    border-radius: 18px;
    object-fit: cover;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.35);
}

ul {
    list-style-type: none;
    padding: 0;
}

footer {
    background-color: rgba(0, 0, 0, 0.7);
    color: #fff;
    text-align: center;
    padding: 18px;
    margin-top: 40px;
    width: 100%;
}

.hidden {
    display: none;
}

.publication-links {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    max-width: 60%;
}

.publication-links a {
    display: inline-block;
    text-decoration: none;
    color: #fff;
    background-color: rgba(0, 0, 0, 0.85);
    padding: 8px 16px;
    border-radius: 10px;
    border-bottom: 2px solid transparent;
    transition: background-color 0.25s ease, border-bottom 0.2s ease, transform 0.15s ease;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
}

.publication-links a:hover {
    background-color: #333;
    border-bottom: 2px solid #00e5ff;
    transform: translateY(-1px);
}

.publication-links a:focus {
    outline: 2px solid #00e5ff;
    outline-offset: 2px;
}

.with-toc {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.side-toc {
    position: sticky;
    top: 90px;
    min-width: 200px;
    max-width: 220px;
    max-height: calc(100vh - 140px);
    overflow: auto;
    padding: 12px;
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.side-toc .toc-title {
    font-weight: 600;
    letter-spacing: 0.3px;
    margin-bottom: 8px;
    display: block;
}

.side-toc .toc-divider {
    margin: 4px 0 6px;
    border: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.side-toc a {
    display: block;
    position: relative;
    padding: 6px 8px 6px 30px;
    border-radius: 10px;
    color: #b8ecff;
    background-color: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.12);
    transition: background-color 0.2s ease, color 0.2s ease;
    font-weight: 500;
    font-size: 0.95rem;
}

.side-toc a.toc-h2 {
    font-weight: 700;
    padding-left: 30px;
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.side-toc a.toc-h3 {
    font-weight: 500;
    padding-left: 46px;
    opacity: 0.9;
}

.side-toc a::before {
    content: '';
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    width: 14px;
    height: 14px;
    background-image: url('Pictures/BH.png');
    background-size: contain;
    background-repeat: no-repeat;
}

.side-toc a.toc-h3::before {
    left: 18px;
    width: 12px;
    height: 12px;
    opacity: 0.8;
}

.side-toc a:hover {
    background-color: rgba(0, 229, 255, 0.15);
    color: #fff;
}

a {
    color: #00e5ff;
    text-decoration: none;
}

a:hover {
    color: #0095b3;
}

a:active {
    color: #ff0000;
}

nav a {
    color: #fff;
    text-decoration: none;
    padding: 5px 20px;
    border-radius: 10px;
    transition: background-color 0.3s ease, border-bottom 0.2s ease;
    border-bottom: 2px solid transparent;
}

nav a:hover {
    color: #fff;
    background-color: #333;
    border-bottom: 2px solid #00e5ff;
}

nav a:active {
    color: #fff;
}

.publications-list {
    list-style-type: none;
    padding: 0;
}

.publications-list li {
    position: relative;
    padding-left: 30px;
    margin-bottom: 14px;
}

.publications-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    background-image: url('Pictures/BH.png');
    background-size: contain;
    background-repeat: no-repeat;
}

.coauthor {
    color: #d1c7c7;
}

@media (max-width: 768px) {
    header, nav, section {
        max-width: 92%;
    }

    nav {
        flex-direction: column;
        gap: 8px;
        position: sticky;
        top: 0;
    }

    nav a {
        padding: 10px 14px;
        text-align: center;
    }

    h1 {
        font-size: 1.8rem;
    }

    h2 {
        font-size: 1.4rem;
    }

    h3 {
        font-size: 1.1rem;
    }

    .publication-links {
        max-width: 100%;
        flex-wrap: wrap;
        gap: 10px;
    }

    .with-toc {
        flex-direction: column;
    }

    .side-toc {
        position: static;
        width: 100%;
        max-width: 100%;
        max-height: none;
    }
}