/* =========================================
   Root, reset & global layout
   ========================================= */

:root {
    --nav-height: 60px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

section {
    scroll-margin-top: var(--nav-height);
}

body {
    padding-top: var(--nav-height);
    font-family: 'Arial', sans-serif;
    line-height: 1.2;
    color: #333;
    overflow-x: hidden;
}

/* =========================================
   Logo & navigation
   ========================================= */

.logo a {
    display: inline-block;
}

.logo a:hover img {
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
}

.logo-img {
    height: 40px;
    width: 45px;
    margin-right: 10px;
}

/* Navigation bar */
.nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(223, 240, 237, 0.951);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 0.5rem 1.5rem;
    transition: all 0.3s ease;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 3000px;
    margin: 0 auto;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 0;
}

.nav-links li {
    position: relative;
    padding-left: 1rem;
    margin-left: 1rem;
    border-left: 1px solid #ccc;
}

.nav-links li:first-child {
    border-left: none;
    padding-left: 0;
    margin-left: 0;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    background: linear-gradient(45deg, #01aa9c, #00d2c0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* =========================================
   Hero section (video + title)
   ========================================= */

.hero {
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><circle cx="200" cy="200" r="100" fill="rgba(255,255,255,0.1)"/><circle cx="800" cy="300" r="150" fill="rgba(255,255,255,0.05)"/><circle cx="300" cy="700" r="80" fill="rgba(255,255,255,0.1)"/></svg>');
    animation: floating 20s ease-in-out infinite;
}

.hero-video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
}

.hero-content {
    z-index: 2;
    position: relative;
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: fadeInUp 1s ease-out;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.8);
    padding: 10px;
    border-radius: 5px;
}

.hero p {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    animation: fadeInUp 1s ease-out 0.3s both;
}

/* Call-to-action buttons (News "More", Contact "Send") */
.cta-button {
    background: #00979a;
    background-size: 300% 300%;
    animation: gradientShift 3s ease infinite, fadeInUp 1s ease-out 0.6s both;
    color: white;
    padding: 15px 30px;
    border: none;
    border-radius: 50px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: auto;
    display: block;
}

.cta-button:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

/* =========================================
   Generic sections & cards
   ========================================= */

.section {
    padding: 80px 20px;
    max-width: 1200px;
    margin: 0 auto;
    z-index: 1;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    background: #00979a;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Stat-style cards used for news, opportunities, member pages */
.stat-card {
    background: #fff;
    padding: 2rem;
    width: 50%;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
    border: 2px solid transparent;
    background-clip: padding-box;
    z-index: 10;
}

.stat-label {
    color: #666;
    font-size: 1.1rem;
    display: block;
}

/* Content container: generic 2-column layout */
.content-container {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    align-items: flex-start;
    z-index: 1;
}

/* Fade-in utility (colour + font size also used) */
.fade-in {
    color: #666;
    font-size: 1.1rem;
    display: block;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================
   Welcome section (text + logo + photo strip)
   ========================================= */

.team {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: white;
    padding: 80px 20px;
    position: relative;
    z-index: 1;
}

/* Main welcome card: text + logo */
.welcome-card {
    background: #fff;
    padding: 2rem;
    border-radius: 24px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.welcome-text {
    flex: 2;
    text-align: justify;
}

.welcome-logo {
    flex: 1;
    display: flex;
    justify-content: center;
}

.welcome-logo img {
    max-width: 240px;
    width: 100%;
    height: auto;
    border-radius: 0;     /* remove rounded frame */
    box-shadow: none;     /* remove shadow */
    background: none;     /* ensure no background */
}

/* Links in welcome text */
.welcome-text a {
    color: #00979a;
    font-weight: 600;
    text-decoration: none;
    border-bottom: 1px solid rgba(0, 151, 154, 0.3);
}

.welcome-text a:hover {
    border-bottom-color: #006b6f;
    color: #006b6f;
}

/* Horizontal scrollable photo strip below welcome card */
.photo-strip {
    margin-top: 2.5rem;
    width: 100%;
    overflow-x: auto;
    padding-bottom: 1rem;
}

.photo-strip-inner {
    display: flex;
    gap: 1.5rem;
    padding: 0.5rem;
    width: max-content;
    margin: 0 auto;              /* center when narrower than viewport */
}

.photo-strip-inner img {
    height: 260px;
    flex: 0 0 auto;
    border-radius: 20px;
    object-fit: cover;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.15);
}

/* =========================================
   Team grid (home page)
   ========================================= */

.team-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 100px;
    margin-top: 3rem;
}

.neon-img {
    position: relative;
    z-index: 2;
    transition: transform 0.3s ease;
    text-align: center;
    min-width: 180px;
}

.neon-img:hover {
    transform: scale(1.05);
}

/* Email line under each member */
.member-email {
    font-size: 0.85rem;
    color: #acacac;
    margin-top: 4px;
    margin-bottom: 8px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    user-select: text;
}

.member-email i {
    color: #acacac;
    font-size: 0.9rem;
}

/* Social icons (home + member pages) */
.social-icons {
    display: flex;
    justify-content: center;
    gap: 10px;
    padding: 10px 0;
}

.social-icons a {
    color: #666;
    font-size: 16px;
    text-decoration: none;
    transition: color 0.3s ease;
}

.social-icons a:hover {
    color: #333;
}

.social-icons img {
    width: 28px;
    height: 28px;
    filter: grayscale(100%);
}

/* =========================================
   Alumni section
   ========================================= */

#alumni {
    background: #fff;
    color: #000;
    padding: 0 2px;
    position: relative;
    z-index: 1;
}

.alumni-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-width: 850px;
    margin: 0 auto;
    line-height: 0.2;
}

.alumni-member {
    display: grid;
    grid-template-columns: 1fr 0.5fr 0.7fr;
    gap: 1rem;
    background: rgba(255, 255, 255, 0.7);
    padding: 0.5rem;
    border-radius: 8px;
    text-align: left;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0);
}

.alumni-name,
.alumni-role,
.alumni-dates {
    margin: 0;
    padding: 0;
}

.alumni-name {
    font-size: 1.1rem;
}

/* =========================================
   Publications section
   ========================================= */

.publication-list {
    list-style: none;
    padding: 0;
    z-index: 1;
}

.publication-item {
    background: #fff;
    margin-bottom: 1rem;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    z-index: 1;
    border-left: 4px solid #00979a;
}

.publication-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.publication-date {
    font-style: italic;
    color: #7f8c8d;
    margin-bottom: 0.5rem;
}

.publication-title {
    font-weight: bold;
    margin-bottom: 0.5rem;
    color: #2c3e50;
}

.publication-link {
    color: #3498db;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}

.publication-link:hover {
    color: #e74c3c;
}

/* Layout when a publication has a figure */
.publication-content {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    align-items: center;
    margin-top: 0.5rem;
}

.publication-text {
    flex: 1 1 260px;
    text-align: left;
}

.publication-authors {
    font-style: italic;
    margin-bottom: 0.5rem;
    color: #555;
}

.publication-summary {
    margin-bottom: 0.75rem;
    color: #555;
}

.publication-meta {
    font-size: 0.9rem;
    color: #7f8c8d;
}

/* Figure column */
.publication-figure {
    flex: 0 0 260px;
    max-width: 320px;
    margin-left: auto;
    margin-top: 0.2rem;
    margin-bottom: 0.2rem;
}

.publication-figure img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
    margin-top: 0;
    margin-bottom: 0;
}

.publication-figure-caption {
    font-size: 0.85rem;
    color: #7f8c8d;
    margin-top: 0.3rem;
}

/* Slightly tighter vertical padding for preprint card */
.publication-item.publication-preprint {
    padding-top: 0.8rem;
    padding-bottom: 0.8rem;
}

/* =========================================
   Home-page News section (short list + "More")
   ========================================= */

#news .content-container {
    width: 100%;
    justify-content: flex-start;
    align-items: flex-start;
    padding: 0;
    z-index: 1;
}

#news .stat-card {
    width: 100%;
    max-width: none;
    margin: 0;
    padding: 30px;
    text-align: left;
    z-index: 10;
}

#news .stat-label ul {
    list-style: none;
    margin: 0;
    padding: 0;
    z-index: 10;
}

#news .stat-label li {
    display: flex;
    align-items: baseline;
    gap: 16px;
    margin-bottom: 14px;
    line-height: 1.5;
    text-align: left;
}

#news .stat-label li:last-child {
    margin-bottom: 0;
}

#news .stat-label li strong {
    display: inline-block;
    min-width: 140px;
    white-space: nowrap;
    text-align: right;
    color: #555;
    font-weight: 700;
}

/* =========================================
   Opportunities section
   ========================================= */

#opportunities .content-container {
    width: 100%;
    justify-content: flex-start;
    align-items: flex-start;
    padding: 0;
    z-index: 1;
}

#opportunities .stat-card {
    width: 100%;
    max-width: none;
    margin: 0;
}

#opportunities .stat-label {
    text-align: left;
    width: 100%;
    box-sizing: border-box;
}

#opportunities .stat-label p,
#opportunities .stat-label li {
    text-align: justify;
}

#opportunities ul {
    margin-left: 2rem;
    padding-left: 0;
}

#opportunities ul li {
    padding-left: 1rem;
}

/* =========================================
   Full News page (news.html)
   ========================================= */

.page-news #news {
    padding-top: 100px;
    padding-bottom: 80px;
}

.page-news .news-wrapper {
    max-width: 900px;
    margin: 0 auto 60px;
    padding: 0 1rem;
}

.page-news .news-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

/* Default: one row per item (date + text) */
.page-news .news-list li {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 0.6rem 0;
    border-bottom: 1px solid #e3ecea;
    line-height: 1.5;
}

.page-news .news-list li:last-child {
    border-bottom: none;
}

.page-news .news-date {
    min-width: 140px;
    text-align: right;
    white-space: nowrap;
    font-weight: 600;
    color: #555;
}

.page-news .news-text {
    flex: 1;
}

/* Items that have a big photo */
.page-news .news-list li.has-photo {
    flex-direction: column;
    gap: 0.75rem;
}

.page-news .news-list li.has-photo .news-main-row {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
}

.page-news .news-img {
    width: 360px;
    max-width: 100%;
    border-radius: 20px;
    object-fit: cover;
    align-self: center;
    margin-left: calc(140px + 1.5rem);
}

/* =========================================
   Member pages (page-member)
   ========================================= */

.page-member .image-container {
    flex: 0 0 260px;
    min-width: 220px;
}

.page-member .member-photo {
    width: 100%;
    height: auto;
    border-radius: 20px;
    object-fit: cover;
    display: block;
}

.page-member .social-icons {
    justify-content: center;
}

.page-member .stats .content-container {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    align-items: flex-start;
    max-width: 1200px;
    margin: 0 auto;
    justify-content: center;
}

.page-member .stats .stat-card {
    flex: 1 1 320px;
    max-width: 700px;
    width: auto;
    text-align: justify;
}

.page-member .stats .image-container {
    flex: 0 0 320px;
    max-width: 380px;
    min-width: 240px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.page-member .stats .image-container img {
    width: 100%;
    height: auto;
    border-radius: 20px;
    object-fit: cover;
}

.page-member .stat-label {
    text-align: justify;
}

/* Restore vertical padding on member pages */
.page-member section {
    padding-top: 80px;
    padding-bottom: 80px;
}

.page-member section {
    padding: 80px 20px;
}

/* =========================================
   Contact section: file drop zone
   ========================================= */

.drop-zone {
    border: 2px dashed #aaa;
    border-radius: 50px;
    padding: 20px;
    text-align: center;
    width: 300px;
    background-color: #fff;
    color: #666;
    cursor: pointer;
    transition: background-color 0.3s, border-color 0.3s;
    margin: auto;
    display: block;
}

.drop-zone.dragover {
    background-color: #f0f0f0;
    border-color: #333;
}

/* Equal-height columns in Contact section */
#contact .content-container {
    justify-content: center;
    align-items: stretch;   /* same height for both columns */
}

#contact .contact-columns > .contact-column {
    flex: 1;
    min-width: 300px;
    display: flex;
    flex-direction: column;
}

/* Map fills its column */
#contact .contact-column iframe {
    flex: 1;
    width: 100%;
    border-radius: 20px;
}

/* Make the form stretch to full column height as well */
#contact #contact-form {
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Let the drop zone + button sit nicely inside */
#contact #contact-form .drop-zone {
    margin-top: 1rem;
    margin-bottom: 1.5rem;
}

#contact #contact-form .cta-button {
    align-self: center;
}


/* =========================================
   Partners banner & footer
   ========================================= */

.partners-banner {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 100px;
    padding: 5px 0;
    overflow-x: auto;
    white-space: nowrap;
    z-index: 1;
}

.partners-banner img {
    height: 60px;
    width: auto;
    transition: filter 0.3s ease;
    flex-shrink: 0;
}

.partners-banner img:hover {
    filter: grayscale(0%);
}

.footer {
    background-image: url(images/foott.jpg);
    color: #a6e0e3;
    text-align: center;
    padding: 3rem 0;
    position: relative;
    z-index: 1;
}

/* =========================================
   Floating math/biology "emoji" animation
   ========================================= */

.emoji {
    position: fixed;
    top: -50px;
    font-size: 24px;
    animation: fall linear infinite;
    pointer-events: none;
    z-index: 0;
}

.emoji:nth-child(odd) {
    animation-duration: 8s;
}

.emoji:nth-child(even) {
    animation-duration: 12s;
}

/* =========================================
   Animations
   ========================================= */

@keyframes floating {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

@keyframes gradientShift {
    0%   { background-position: 0% 50%; }
    50%  { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fall {
    to {
        transform: translateY(100vh);
    }
}

/* =========================================
   Responsive adjustments
   ========================================= */

@media (max-width: 900px) {
    .welcome-card {
        flex-direction: column;
        text-align: center;
    }

    .welcome-text {
        text-align: justify;
    }

    .page-member .stats .content-container {
        flex-direction: column;
    }

    .page-member .stats .stat-card,
    .page-member .stats .image-container {
        flex: 1 1 100%;
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1.2rem;
    }

    .nav-links {
        display: none;
    }

    .section-title {
        font-size: 2rem;
    }
}

/* Full news page & images on very small screens */
@media (max-width: 600px) {
    .page-news .news-list li,
    .page-news .news-list li.has-photo {
        flex-direction: column;
    }

    .page-news .news-date {
        text-align: left;
    }

    .page-news .news-list li.has-photo .news-main-row {
        flex-direction: column;
    }

    .page-news .news-img {
        margin-left: 0;
    }
}