body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.5;
    background-color: #f9f9f9;
    color: #13294b;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    background-color: #242424;
    padding: 0.5em;
    justify-content: center;
    display: flex;
    z-index: 1000;
    box-sizing: border-box; /* prevent padding from causing horizontal overflow */
}

.navbar-box {
    width: 100%;
    max-width: 900px;
    margin: 0 1rem;
    text-align: right;
}

.navbar-box a {
    color: white;
    text-decoration: none;
    margin: 0;
    padding: 0.2em 0.5em; /* give room for hover background */
    border-radius: 6px;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.navbar-box a:hover,
.navbar-box a:focus,
.navbar-box a:focus-visible {
    text-decoration: none; /* remove underline */
    background-color: rgba(255, 255, 255, 0.15); /* highlight the tab */
    outline: none;
}

.intro {
    margin-top: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    flex-wrap: wrap; 
}

.intro img {
    border-radius: 50%;
    max-width: 150px;
    margin-left: 30px;
}

.intro-text {
    max-width: 650px;
    text-align: justify;
    padding: 10px;
}

/* Accent links inside intro text (e.g., advisor, lab links) */
.intro-text a {
    color: #d44444; /* match authors link color */
    text-decoration: none; /* remove default underline */
}
.intro-text a:visited {
    color: #d44444; /* keep same color after visit */
}
.intro-text a:hover,
.intro-text a:focus {
    text-decoration: underline; /* optional hover underline */
}

.publication {
    padding: 20px;
    background-color: #ffffff;
}

.publication h1 {
    text-align: center;
}

.publication-item {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    gap: 20px;
    flex-wrap: wrap; 
}

.publication-item img,
.publication-item video {
    width: 100%;
    max-width: 150px;
    margin-left: 0;
}

.publication-item-text {
    width: 100%;
    max-width: 700px;
    line-height: 1.5rem;
    text-align: justify;
}

.publication-item-text h1 {
    margin: 0;
    padding: 0;
    justify-content: justify;
    text-align: left;
}

.publication-item-text h1 a {
    font-size: 1.2rem;
    font-weight: 700;
    color: #13294b;
    text-decoration: none;
}

.publication-item-text h1 a:hover {
    text-decoration: underline;
}

.authors {
    margin: 0 0;
    padding: 0;
    font-size: 1rem;
}

.authors a {
    font-weight: 400;
    color: #d44444;
    text-decoration: none;
}

.authors a:hover {
    text-decoration: underline;
}

.publication-item-text p {
    margin: 0 0;
    padding: 0;
    font-size: 1rem;
    font-style: italic;
}

.document-links {
    margin: 0.5rem 0;
}

.icon-button i {
    margin-right: 0.2rem;
}
.icon-button-static {
    display: inline-block;
    margin: 0.5rem 0.3rem;
    padding: 0.2rem 0.5rem;
    border-radius: 5px;
    font-weight: 400;
    text-decoration: none;
    border: 1px solid #a52a2a;
    color: #a52a2a;
    background-color: #ffffff;
    transition: background-color 0.3s, color 0.3s;
}
.icon-button {
    display: inline-block;
    margin: 0.5rem 0.3rem;
    padding: 0.2rem 0.5rem;
    border-radius: 5px;
    font-weight: 400;
    text-decoration: none;
    border: 1px solid #13294b;
    color: #13294b;
    background-color: #ffffff;
    transition: background-color 0.3s, color 0.3s;
}

.icon-button:hover {
    background-color: #13294b;
    color: white;
}

.contact {
    padding: 10px;
    font-size: 1rem;
    text-align: center;
    margin-bottom: 2rem;
}

.contact-icon-button {
    display: inline-flex; 
    align-items: center; 
    margin: 0.25rem; 
    text-decoration: none;
    color: #13294b;
    font-weight: 400;
    border: 1px solid transparent; 
    padding: 0.2rem 0.4rem;
}

.contact-icon-button i {
    margin-right: 0; 
}

/* Ensure inline SVG icons in contact buttons match size/color of font icons */
.contact-icon-button svg {
    width: 1em;
    height: 1em;
    fill: currentColor;
    margin-right: 0; 
    vertical-align: -0.125em;
}

/* Blackboard bold X as an icon */
.contact-icon-button .x-icon {
    display: inline-block;
    margin-right: 0.5rem;
    font-size: 1.1em;
    line-height: 1;
}

/* Ensure <img> icons align like font icons */
.contact-icon-button img {
    width: 1em;
    height: 1em;
    margin-right: 0; 
    vertical-align: -0.125em;
}

/* Slightly smaller X icon */
.contact-icon-button img[alt="X"] {
    width: 0.8em;
    height: 0.8em;
}

.contact-icon-button:hover {
    color: #d44444; 
}

footer {
    text-align: center;
    margin: 2rem 0;
    color: #6c757d;
}



@media (max-width: 768px) {
    .navbar-box {
        text-align: center;
    }

    .navbar-box a {
        display: inline-block;
        margin: 10px;
    }

    .intro {
        flex-direction: column; 
        text-align: center;
    }

    .intro img {
        max-width: 120px;
        margin: auto 0
    }

    .publication-item {
        flex-direction: column; 
        text-align: center;
    }

    .publication-item img {
        margin: 0 auto;
    }

    .publication-item-text {
        text-align: center;
    }

    .publication-item-text h1 {
        margin: 0;
        padding: 0;
        justify-content: center;
        text-align: center;
    }
        .contact-icon-button {
        display: inline-block; 
        margin: auto 0.7rem; 
    }
}