/* Generated by Copilot */
/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

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

/* Header Styles */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 0;
}

.header-title h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #2d3748;
    margin-bottom: 0.5rem;
}

.header-subtitle {
    font-size: 1.1rem;
    color: #718096;
    font-weight: 400;
}

.header-stats {
    display: flex;
    gap: 2rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: #667eea;
}

.stat-label {
    font-size: 0.9rem;
    color: #718096;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Filters Section */
.filters-section {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    padding: 2rem 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.search-container {
    display: flex;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.search-input {
    flex: 1;
    padding: 1rem 1.5rem;
    border: 2px solid #e2e8f0;
    border-radius: 50px 0 0 50px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s ease;
}

.search-input:focus {
    border-color: #667eea;
}

.search-btn {
    padding: 1rem 1.5rem;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 0 50px 50px 0;
    cursor: pointer;
    font-size: 1.2rem;
    transition: background-color 0.3s ease;
}

.search-btn:hover {
    background: #5a67d8;
}

.filters-container {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    align-items: end;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.filter-group label {
    font-weight: 500;
    color: #4a5568;
    font-size: 0.9rem;
}

.filter-group select,
.filter-group input {
    padding: 0.75rem;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.3s ease;
    min-width: 160px;
}

.filter-group select:focus,
.filter-group input:focus {
    border-color: #667eea;
}

.date-filter {
    flex-direction: row;
    align-items: center;
    gap: 0.5rem;
}

.date-filter input {
    min-width: 140px;
}

.clear-filters-btn {
    padding: 0.75rem 1.5rem;
    background: #f56565;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.clear-filters-btn:hover {
    background: #e53e3e;
}

/* Main Content */
.main {
    padding: 3rem 0;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    background: rgba(255, 255, 255, 0.9);
    padding: 1rem 2rem;
    border-radius: 12px;
    backdrop-filter: blur(10px);
}

.results-count {
    font-weight: 500;
    color: #4a5568;
}

.view-toggle {
    display: flex;
    background: #f7fafc;
    border-radius: 8px;
    overflow: hidden;
}

.view-btn {
    padding: 0.5rem 1rem;
    border: none;
    background: transparent;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.view-btn.active {
    background: #667eea;
    color: white;
}

/* Papers Grid */
.papers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: 2rem;
}

.papers-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.paper-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    cursor: pointer;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.paper-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.paper-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.paper-authors {
    color: #718096;
    font-size: 0.95rem;
    margin-bottom: 1rem;
    font-style: italic;
}

.paper-date {
    color: #667eea;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.paper-abstract {
    color: #4a5568;
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.paper-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tag {
    background: #edf2f7;
    color: #4a5568;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.tag.task-type {
    background: #e6fffa;
    color: #319795;
}

.tag.evaluation-type {
    background: #fef5e7;
    color: #d69e2e;
}

.tag.autonomy-level {
    background: #f0fff4;
    color: #38a169;
}

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

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5a67d8;
}

.btn-secondary {
    background: #4299e1;
    color: white;
}

.btn-secondary:hover {
    background: #3182ce;
}

.btn-outline {
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-outline:hover {
    background: #667eea;
    color: white;
}

/* List View Styles */
.papers-list .paper-card {
    display: flex;
    gap: 2rem;
    padding: 1.5rem 2rem;
}

.papers-list .paper-content {
    flex: 1;
}

.papers-list .paper-meta {
    min-width: 200px;
    text-align: right;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
}

.modal-content {
    background: white;
    margin: 5% auto;
    padding: 2rem;
    border-radius: 16px;
    width: 90%;
    max-width: 800px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
}

.close-modal {
    position: absolute;
    right: 1rem;
    top: 1rem;
    font-size: 2rem;
    cursor: pointer;
    color: #718096;
    transition: color 0.3s ease;
}

.close-modal:hover {
    color: #2d3748;
}

/* No Results */
.no-results {
    text-align: center;
    padding: 4rem 2rem;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 16px;
    backdrop-filter: blur(10px);
}

.no-results h3 {
    font-size: 1.5rem;
    color: #4a5568;
    margin-bottom: 1rem;
}

.no-results p {
    color: #718096;
}

/* Footer */
.footer {
    background: rgba(0, 0, 0, 0.8);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }

    .header-title h1 {
        font-size: 2rem;
    }

    .filters-container {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-group {
        width: 100%;
    }

    .date-filter {
        flex-direction: column;
        align-items: stretch;
    }

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

    .results-header {
        flex-direction: column;
        gap: 1rem;
    }

    .modal-content {
        margin: 10% auto;
        width: 95%;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .header-title h1 {
        font-size: 1.75rem;
    }

    .paper-card {
        padding: 1.5rem;
    }

    .search-container {
        flex-direction: column;
    }

    .search-input,
    .search-btn {
        border-radius: 8px;
    }
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

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