/* SHARE Paper Search - Stylesheet */

:root {
    --primary-color: #1e3a5f;
    --primary-light: #2c5282;
    --accent-color: #3182ce;
    --success-color: #38a169;
    --warning-color: #d69e2e;
    --error-color: #e53e3e;
    --bg-color: #f7fafc;
    --card-bg: #ffffff;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    text-align: center;
    padding: 40px 20px;
}

.logo {
    margin-bottom: 20px;
}

.share-logo {
    height: 60px;
    width: auto;
}

header h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Main content */
main {
    flex: 1;
}

/* Search box */
.search-box {
    background: var(--card-bg);
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 24px;
}

.search-input-wrapper {
    display: flex;
    gap: 12px;
}

#search-input {
    flex: 1;
    padding: 14px 18px;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

#search-input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.15);
}

#search-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 24px;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: var(--accent-color);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

#search-btn:hover {
    background: var(--primary-light);
}

#search-btn:active {
    transform: scale(0.98);
}

#search-btn:disabled {
    background: var(--text-secondary);
    cursor: not-allowed;
}

.search-options {
    display: flex;
    gap: 24px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.search-options label {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.search-options select {
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.9rem;
    background: white;
}

.checkbox-label {
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

/* Status messages */
.status {
    text-align: center;
    padding: 12px;
    margin-bottom: 16px;
    border-radius: 8px;
    display: none;
}

.status.loading {
    display: block;
    background: #ebf8ff;
    color: var(--accent-color);
}

.status.error {
    display: block;
    background: #fed7d7;
    color: var(--error-color);
}

.status.info {
    display: block;
    background: #e9d8fd;
    color: #6b46c1;
}

/* Results */
.results {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 8px;
}

.results-header h2 {
    font-size: 1.2rem;
    color: var(--primary-color);
}

.results-count {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Result card */
.result-card {
    background: var(--card-bg);
    border-radius: 10px;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: box-shadow 0.2s, transform 0.2s;
}

.result-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.result-header {
    padding: 16px 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
}

.result-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.4;
}

.result-title a {
    color: white;
    text-decoration: none;
}

.result-title a:hover {
    text-decoration: underline;
}

.result-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 0.85rem;
    opacity: 0.9;
}

.result-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.result-body {
    padding: 16px 20px;
}

.result-text {
    color: var(--text-primary);
    font-size: 0.95rem;
    line-height: 1.7;
    max-height: 200px;
    overflow: hidden;
    position: relative;
}

.result-text.expanded {
    max-height: none;
}

.result-text::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 40px;
    background: linear-gradient(transparent, var(--card-bg));
    pointer-events: none;
}

.result-text.expanded::after {
    display: none;
}

.expand-btn {
    display: inline-block;
    margin-top: 8px;
    padding: 6px 12px;
    font-size: 0.85rem;
    color: var(--accent-color);
    background: none;
    border: 1px solid var(--accent-color);
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}

.expand-btn:hover {
    background: var(--accent-color);
    color: white;
}

.result-footer {
    padding: 12px 20px;
    background: var(--bg-color);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.score-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    background: var(--success-color);
    color: white;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.result-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.pdf-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    color: var(--accent-color);
    text-decoration: none;
    border: 1px solid var(--accent-color);
    border-radius: 4px;
    font-size: 0.85rem;
    transition: background 0.2s, color 0.2s;
}

.pdf-link:hover {
    background: var(--accent-color);
    color: white;
}

.doi-link {
    color: inherit;
    text-decoration: underline;
}

.doi-link:hover {
    color: var(--accent-color);
}

.metadata-toggle-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.metadata-toggle-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.metadata-toggle-btn.active {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
}

/* Metadata Details */
.metadata-details {
    padding: 16px 20px;
    background: var(--bg-color);
    border-top: 1px solid var(--border-color);
}

.metadata-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.metadata-table tr {
    border-bottom: 1px solid var(--border-color);
}

.metadata-table tr:last-child {
    border-bottom: none;
}

.metadata-key {
    padding: 8px 12px 8px 0;
    color: var(--text-secondary);
    font-weight: 500;
    white-space: nowrap;
    vertical-align: top;
    width: 30%;
}

.metadata-value {
    padding: 8px 0;
    color: var(--text-primary);
    word-break: break-word;
}

.metadata-link {
    color: var(--accent-color);
    text-decoration: none;
}

.metadata-link:hover {
    text-decoration: underline;
}

/* Footer */
footer {
    margin-top: 40px;
    padding: 24px;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.footer-content a {
    color: var(--accent-color);
    text-decoration: none;
}

.footer-content a:hover {
    text-decoration: underline;
}

.copyright {
    font-size: 0.85rem;
    margin-top: 12px;
}

/* Loading spinner */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 8px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }

    .search-input-wrapper {
        flex-direction: column;
    }

    .search-options {
        flex-direction: column;
        gap: 12px;
    }

    .result-meta {
        flex-direction: column;
        gap: 6px;
    }

    .result-footer {
        flex-direction: column;
        gap: 12px;
    }
}

/* Index Statistics */
.index-stats {
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 24px;
    margin-bottom: 24px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 20px;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: var(--bg-color);
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.stat-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 10px;
    color: white;
    flex-shrink: 0;
}

.stat-content {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

.stats-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    margin: 0;
}

.stats-description strong {
    color: var(--primary-color);
}

.stats-actions {
    margin-top: 16px;
    text-align: center;
}

.browse-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--accent-color);
    background: transparent;
    border: 2px solid var(--accent-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.browse-btn:hover {
    background: var(--accent-color);
    color: white;
}

/* Papers Section */
.papers-section {
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    padding: 24px;
    margin-bottom: 24px;
}

.papers-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.papers-header h2 {
    color: var(--primary-color);
    font-size: 1.3rem;
    margin: 0;
}

.close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: transparent;
    border: none;
    border-radius: 50%;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.close-btn:hover {
    background: var(--bg-color);
    color: var(--error-color);
}

.papers-filter {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.papers-filter input {
    flex: 1;
    padding: 10px 16px;
    font-size: 0.95rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    outline: none;
    transition: border-color 0.2s;
}

.papers-filter input:focus {
    border-color: var(--accent-color);
}

.papers-count {
    color: var(--text-secondary);
    font-size: 0.9rem;
    white-space: nowrap;
}

.papers-list {
    max-height: 500px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.paper-item {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s;
}

.paper-item:last-child {
    border-bottom: none;
}

.paper-item:hover {
    background: var(--bg-color);
}

.paper-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
    line-height: 1.4;
}

.paper-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.paper-meta span {
    margin-right: 12px;
}

.paper-doi {
    color: var(--accent-color);
    text-decoration: none;
}

.paper-doi:hover {
    text-decoration: underline;
}

.papers-pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.pagination-btn {
    padding: 8px 16px;
    font-size: 0.9rem;
    color: var(--accent-color);
    background: transparent;
    border: 1px solid var(--accent-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
}

.pagination-btn:hover:not(:disabled) {
    background: var(--accent-color);
    color: white;
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .stat-card {
        padding: 12px;
    }

    .stat-value {
        font-size: 1.25rem;
    }
}

/* No results */
.no-results {
    text-align: center;
    padding: 48px 24px;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.no-results h3 {
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.no-results p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}