@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* Global Styles */
:root {
    --umn-maroon: #8C1D40;
    --umn-gold: #FFD700;
    --umn-dark-maroon: #5C1125;
    --umn-light-maroon: #A8405F;
    --umn-light-gold: #FFE673;
}

body {
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    padding-top: 76px;
}

/* Hero Section */
.hero-section {
    position: relative;
    background: linear-gradient(135deg, var(--umn-dark-maroon) 0%, var(--umn-maroon) 60%, var(--umn-light-maroon) 100%);
    color: white;
    padding: 60px 0;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, rgba(255, 215, 0, 0.12) 1px, transparent 1px);
    background-size: 28px 28px;
    pointer-events: none;
}

.panda-highlight {
    color: var(--umn-gold);
    font-weight: bold;
    font-size: 1.1em;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.home-announcement {
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
    padding: 1rem 1.25rem;
    border-radius: 0.5rem;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 215, 0, 0.45);
    text-align: left;
    font-size: 0.98rem;
    line-height: 1.55;
}

/* Cards */
.card {
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    border: 1px solid #e0e0e0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.07);
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--umn-maroon) !important;
    box-shadow: 0 8px 24px rgba(140, 29, 64, 0.18) !important;
}

/* Team Section */
.team-member {
    text-align: center;
    margin-bottom: 30px;
}

.team-member img {
    border-radius: 50%;
    margin-bottom: 15px;
    border: 3px solid var(--umn-gold);
}

/* Contact Form */
.contact-form {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* Footer */
footer {
    background-color: var(--umn-maroon);
    color: white;
    margin-top: 50px;
}

footer a {
    text-decoration: none;
    transition: color 0.3s ease;
    color: var(--umn-gold);
}

footer a:hover {
    color: white !important;
}

/* Navigation */
.navbar {
    background-color: var(--umn-maroon) !important;
}

.navbar-brand {
    transition: transform 0.2s ease;
}

.navbar-brand:hover {
    transform: scale(1.05);
}

.navbar-brand img {
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
    transition: transform 0.2s ease;
}

.navbar-brand:hover img {
    transform: rotate(-5deg) scale(1.1);
}

.nav-link {
    color: white !important;
}

.nav-link:hover {
    color: var(--umn-gold) !important;
}

/* Buttons */
.btn-primary {
    background-color: var(--umn-gold) !important;
    border-color: var(--umn-gold) !important;
    color: var(--umn-dark-maroon) !important;
    font-weight: 600;
}

.btn-primary:hover {
    background-color: var(--umn-dark-maroon) !important;
    border-color: var(--umn-dark-maroon) !important;
    color: white !important;
}

.btn-outline-primary {
    color: var(--umn-maroon) !important;
    border-color: var(--umn-maroon) !important;
}

.btn-outline-primary:hover {
    background-color: var(--umn-maroon) !important;
    color: white !important;
}

/* Paper Highlights */
.paper-highlight {
    border-left: 4px solid var(--umn-maroon) !important;
    border-radius: 0 8px 8px 0 !important;
}

.paper-highlight .paper-title {
    font-weight: 600;
    color: var(--umn-dark-maroon);
    line-height: 1.4;
    font-size: 1rem;
    margin-bottom: 0.4rem;
}

.paper-highlight .paper-authors {
    font-size: 0.875rem;
    color: #444;
    margin-bottom: 0.15rem;
}

.paper-highlight .paper-venue {
    font-size: 0.85rem;
    color: #777;
    margin-bottom: 0.75rem;
}

/* Publications */
.publication-item {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.publication-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15) !important;
}

.publication-item a {
    color: var(--umn-maroon);
    text-decoration: none;
}

.publication-item a:hover {
    color: var(--umn-dark-maroon);
    text-decoration: underline;
}

/* Collaboration Map - Network Graph */
.collaboration-map-container {
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 20px;
    margin-bottom: 20px;
    border: 1px solid #e0e0e0;
    text-align: center;
}

.collaboration-map {
    width: 100%;
    max-width: 1200px;
    height: 500px;
    background: #f8f9fa;
    display: block;
    min-height: 400px;
    border-radius: 5px;
    margin: 0 auto;
}

.collaboration-map .nodes circle {
    transition: all 0.2s ease;
}

.collaboration-map .nodes circle:hover {
    stroke-width: 4;
    filter: drop-shadow(0 0 4px rgba(0, 0, 0, 0.3));
}

.collaboration-map .links line {
    transition: opacity 0.3s ease;
}

.collaboration-map .labels text {
    pointer-events: none;
    user-select: none;
}

.collaboration-map .labels tspan {
    display: block;
}

.network-tooltip {
    font-family: 'Inter', Arial, sans-serif;
}

/* News Section */
.news-photo {
    height: 220px;
    background-color: var(--umn-light-maroon);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    border-radius: 0.375rem 0.375rem 0 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.5);
    font-size: 2rem;
}

.news-card {
    overflow: hidden;
}

.news-card .card-body {
    padding: 1.1rem;
}

.news-date {
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--umn-maroon);
}

/* Section headings */
h2 {
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section {
        padding: 50px 0;
    }

    .card {
        margin-bottom: 20px;
    }

    .collaboration-map {
        height: 400px;
        min-height: 350px;
    }

    .collaboration-map .labels text {
        font-size: 9px !important;
    }
}

/* Animations */
.fade-in {
    animation: fadeIn 1s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}