/* ===== CSS Reset & Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-blue: #4F46E5; /* Indigo */
    --primary-purple: #EC4899; /* Pink/Fuchsia */
    --secondary-blue: #3B82F6; /* Blue */
    --secondary-purple: #A855F7; /* Purple */
    --dark-text: #1F2937;
    --light-text: #6B7280;
    --white: #FFFFFF;
    --light-bg: #F3F4F6; /* Slightly darker light background */
    --card-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --card-shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--dark-text);
    background-color: var(--light-bg);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== Navigation Bar ===== */
.navbar {
    background-color: var(--white);
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    text-decoration: none;
    transition: color 0.3s ease;
}

.nav-logo:hover {
    color: var(--primary-purple);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    color: var(--dark-text);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link:hover {
    background-color: var(--light-bg);
    color: var(--primary-blue);
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-purple) 100%);
    min-height: 80vh; /* Set a minimum height to ensure it's not too large or too small */
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    position: relative; /* For absolute positioning of particles */
    overflow: hidden;
}

.hero-content {
    max-width: 900px;
    padding: 6rem 2rem; /* Move padding to hero-content to control inner spacing */
    position: relative; /* Ensure content is above particles */
    z-index: 2;
}

.logo-container {
    margin-bottom: 2rem;
}

#particles-js {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 1;
}

.logo-circle {
    width: 150px;
    height: 150px;
    background: rgba(255, 255, 255, 0.2);
    border: 4px solid var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease;
}

.logo-circle:hover {
    transform: scale(1.05);
}

.logo-text {
    font-size: 3rem;
    font-weight: 700;
    color: var(--white);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 0.5rem;
    opacity: 0.95;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 10px;
    transition: all 0.3s ease;
    display: inline-block;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--white);
    color: var(--primary-blue);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.btn-secondary {
    background-color: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

.btn-secondary:hover {
    background-color: var(--white);
    color: var(--primary-blue);
    transform: translateY(-2px);
}

/* ===== Features Section ===== */
.features {
    padding: 5rem 2rem;
    background-color: var(--white);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--dark-text);
}

.section-subtitle {
    font-size: 1.1rem;
    text-align: center;
    color: var(--light-text);
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    text-align: center;
    padding: 2rem;
    background-color: var(--light-bg);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow-hover);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-purple) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: var(--white);
}

.feature-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--dark-text);
}

.feature-card p {
    color: var(--light-text);
    line-height: 1.6;
}

/* ===== Models Section ===== */
.models {
    padding: 5rem 2rem;
    background-color: var(--light-bg);
}

.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.model-card {
    background-color: var(--white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.model-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow-hover);
}

.model-card.featured {
    border: 2px solid var(--primary-purple);
    box-shadow: 0 0 0 4px rgba(236, 72, 153, 0.3); /* Highlight with a glow */
}

.model-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-purple) 100%);
    color: var(--white);
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.model-name {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--dark-text);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.model-type {
    font-size: 0.9rem;
    color: var(--light-text);
    margin-bottom: 1rem;
}

.model-description {
    color: var(--light-text);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}



.model-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.model-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    background-color: var(--light-bg);
    color: var(--primary-blue);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.model-link:hover {
    background-color: var(--primary-blue);
    color: var(--white);
}

/* ===== Papers Section ===== */
.papers {
    padding: 5rem 2rem;
    background-color: var(--white);
}

.papers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.paper-card {
    background-color: var(--light-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
    border-left: 4px solid var(--primary-blue);
}

.paper-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow-hover);
    border-left-color: var(--primary-purple);
}

.paper-card.featured {
    border-left-color: var(--primary-purple);
}

.paper-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.paper-icon {
    font-size: 2rem;
    color: var(--primary-blue);
}

.paper-badge {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-purple) 100%);
    color: var(--white);
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.paper-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--dark-text);
    margin-bottom: 1rem;
    line-height: 1.4;
}

.paper-meta {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.paper-arxiv {
    color: var(--primary-blue);
    font-weight: 600;
    font-size: 0.95rem;
}

.paper-date {
    color: var(--light-text);
    font-size: 0.9rem;
}

.paper-description {
    color: var(--light-text);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.paper-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.paper-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    background-color: var(--white);
    color: var(--primary-blue);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 1px solid var(--primary-blue);
}

.paper-link:hover {
    background-color: var(--primary-blue);
    color: var(--white);
}

/* ===== Datasets Section ===== */
.datasets {
    padding: 5rem 2rem;
    background-color: var(--light-bg);
}

.datasets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.dataset-card {
    background-color: var(--white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
}

.dataset-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow-hover);
}

.dataset-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--secondary-blue) 0%, var(--secondary-purple) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 2rem;
    color: var(--white);
}

.dataset-name {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--dark-text);
    margin-bottom: 1rem;
}

.dataset-description {
    color: var(--light-text);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}



.dataset-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    background-color: var(--light-bg);
    color: var(--primary-blue);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.dataset-link:hover {
    background-color: var(--primary-blue);
    color: var(--white);
}

/* ===== Footer ===== */
.footer {
    background-color: var(--dark-text);
    color: var(--white);
    padding: 3rem 2rem 1.5rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-info h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.footer-info p {
    color: rgba(255, 255, 255, 0.7);
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--white);
    font-size: 1.8rem;
    transition: all 0.3s ease;
}

.footer-links a:hover {
    color: var(--primary-blue);
    transform: scale(1.1);
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

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

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

    .models-grid,
    .papers-grid,
    .datasets-grid {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

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

/* ===== Smooth Scrolling ===== */
html {
    scroll-behavior: smooth;
}

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

.hero-content,
.feature-card,
.model-card,
.paper-card,
.dataset-card {
    animation: fadeInUp 0.6s ease-out;
}