/* Modern Scandinavian/Fintech design for ML Papers */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'SF Pro Display', system-ui, sans-serif;
    font-size: 14px;
    color: #1a1a1a;
    background-color: #fafafa;
    margin: 0;
    padding: 0;
    line-height: 1.5;
    letter-spacing: -0.01em;
}

.container {
    background: #fafafa;
    padding: 0;
    max-width: 1200px;
    margin: 0 auto;
}

/* Header styles */
.header {
    background: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
    padding: 24px;
    margin-bottom: 32px;
    border-radius: 0 0 8px 8px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.header h1 {
    font-size: 28px;
    font-weight: 600;
    color: #ffffff;
    margin: 0 0 8px 0;
    padding: 0;
    letter-spacing: -0.02em;
}

.header h1 a {
    color: #ffffff;
    text-decoration: none;
}

.header .subtitle {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
    margin: 0;
    padding: 0;
    font-weight: 400;
}

.header .subtitle a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
}

.header .subtitle a:hover {
    color: #ffffff;
}

.header .nav {
    margin-top: 12px;
    font-size: 14px;
}

.header .nav a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    margin-right: 16px;
}

.header .nav a:hover {
    color: #ffffff;
}

/* Category navigation */
.category-nav {
    background: #ffffff;
    padding: 16px 24px;
    margin-bottom: 24px;
    border-radius: 8px;
    border: 1px solid #e5e7eb;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

.category-nav .nav-item {
    color: #6b7280;
    text-decoration: none;
    margin-right: 24px;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 6px;
    transition: all 0.2s ease;
    display: inline-block;
}

.category-nav .nav-item:hover {
    color: #2563eb;
    background-color: #eff6ff;
}

.category-nav .nav-item.active {
    color: #2563eb;
    background-color: #dbeafe;
    font-weight: 600;
}

/* Week navigation */
.week-nav {
    background: #f8fafc;
    padding: 12px 24px;
    margin: 16px 0;
    border-radius: 6px;
    border: 1px solid #e2e8f0;
    font-size: 13px;
}

.week-nav a {
    color: #475569;
    text-decoration: none;
    margin: 0 16px 0 0;
    font-weight: 500;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.week-nav a:hover {
    color: #2563eb;
    background-color: #eff6ff;
}

/* Main content */
.category-section {
    margin: 32px 24px;
    padding: 0;
}

.category-section h2 {
    font-size: 20px;
    font-weight: 600;
    margin: 32px 0 16px 0;
    color: #1f2937;
    letter-spacing: -0.01em;
    padding-bottom: 8px;
    border-bottom: 2px solid #e5e7eb;
}

.category-section h2 a {
    color: #1f2937;
    text-decoration: none;
    transition: color 0.2s ease;
}

.category-section h2 a:hover {
    color: #2563eb;
}

.papers-list {
    margin: 0;
}

/* Individual paper styles */
.paper {
    margin: 0 0 24px 0;
    padding: 20px;
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    transition: all 0.2s ease;
}

.paper:hover {
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    border-color: #d1d5db;
}

.paper-even,
.paper-odd {
    /* Remove alternating backgrounds for cleaner look */
    background-color: #ffffff;
}

.paper-header {
    margin: 0 0 12px 0;
    display: flex;
    align-items: center;
    gap: 12px;
}

.paper-title {
    color: #111827;
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    line-height: 1.4;
    letter-spacing: -0.01em;
    transition: color 0.2s ease;
}

.paper-title:hover {
    color: #2563eb;
}

.paper-title:visited {
    color: #6b7280;
}

.paper-meta {
    font-size: 13px;
    color: #6b7280;
    margin: 0 0 12px 0;
    font-weight: 400;
}

/* Featured paper styles */
.featured-badge {
    background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.1);
}

.featured-info {
    font-size: 12px;
    color: #6b7280;
    margin: 8px 0;
    font-style: italic;
    padding: 8px 12px;
    background: #f9fafb;
    border-radius: 4px;
    border-left: 3px solid #e5e7eb;
}

.actual-pub-date {
    color: #6b7280;
    font-style: italic;
}

.citation-velocity {
    color: #059669;
    font-weight: 600;
    background: #ecfdf5;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 12px;
}

.paper-category {
    color: #6b7280;
    background: #f3f4f6;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 500;
    display: inline-block;
    margin-left: 8px;
}

/* Abstract styles */
.abstract-preview {
    font-size: 14px;
    color: #374151;
    margin: 8px 0;
    line-height: 1.6;
}

.abstract-full {
    font-size: 14px;
    color: #374151;
    margin: 8px 0;
    line-height: 1.6;
}

.abstract-toggle {
    background: none;
    border: none;
    color: #6b7280;
    font-size: 13px;
    cursor: pointer;
    text-decoration: none;
    padding: 4px 8px;
    margin: 8px 0 0 0;
    border-radius: 4px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.abstract-toggle:hover {
    color: #2563eb;
    background-color: #eff6ff;
}

.hidden {
    display: none;
}

/* Reasoning section */
.reasoning-content {
    margin: 8px 0;
    padding: 12px;
    background: #f8fafc;
    border-radius: 6px;
    border-left: 3px solid #e5e7eb;
}

.reasoning-content h4 {
    font-size: 14px;
    font-weight: 600;
    color: #374151;
    margin: 0 0 8px 0;
}

.reasoning-content p {
    font-size: 13px;
    color: #4b5563;
    margin: 0;
    line-height: 1.5;
}

.abstract-section,
.detailed-analysis {
    margin: 12px 0;
}

.abstract-content,
.analysis-content {
    margin: 8px 0;
}

/* Date sections */
.date-section {
    margin: 24px 0;
    padding: 0;
}

.date-header {
    font-size: 16px;
    font-weight: 600;
    color: #1f2937;
    background: none;
    margin: 32px 0 16px 0;
    padding: 12px 0;
    border-bottom: 1px solid #e5e7eb;
    position: relative;
}

.date-header::before {
    content: "";
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 48px;
    height: 2px;
    background: #2563eb;
}

/* Previous week styling */
.date-header.previous-week {
    color: #6b7280;
    opacity: 0.8;
}

.paper.previous-week {
    opacity: 0.8;
}

.paper.previous-week.paper-even,
.paper.previous-week.paper-odd {
    background-color: #f9fafb;
}

/* Mobile responsiveness */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    .header {
        padding: 16px;
        margin-bottom: 24px;
    }

    .header h1 {
        font-size: 24px;
    }

    .category-section {
        margin: 24px 0;
    }

    .category-nav {
        padding: 12px 16px;
    }

    .category-nav .nav-item {
        display: block;
        margin: 4px 0;
    }

    .paper {
        padding: 16px;
    }

    .paper-title {
        font-size: 15px;
    }

    .paper-meta,
    .abstract-preview,
    .abstract-full {
        font-size: 13px;
    }
}

/* Best papers specific styles */
.best-nav {
    background: #f0f9ff;
    padding: 16px 24px;
    margin: 16px 0;
    font-size: 13px;
    border-left: 4px solid #2563eb;
    border-radius: 0 6px 6px 0;
}

.best-nav a {
    color: #1e40af;
    text-decoration: none;
    margin-right: 16px;
    font-weight: 500;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.best-nav a:hover {
    background-color: #dbeafe;
    color: #1d4ed8;
}

.paper-rank {
    font-size: 12px;
    font-weight: 600;
    color: #2563eb;
    margin-bottom: 8px;
    padding: 4px 8px;
    background: #eff6ff;
    border-radius: 4px;
    display: inline-block;
}

.best-paper {
    border-left: 3px solid #2563eb;
    padding-left: 16px;
}

/* Subcategory navigation */
.subcat-nav {
    background: #f1f5f9;
    padding: 12px 16px;
    margin: 12px 0;
    border-radius: 6px;
    border: 1px solid #cbd5e1;
}

.subcat-nav-item {
    color: #1e293b;
    text-decoration: none;
    margin-right: 12px;
    font-size: 13px;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.subcat-nav-item:hover {
    color: #2563eb;
    background-color: #eff6ff;
}

.subcat-nav-item.active {
    color: #2563eb;
    background-color: #dbeafe;
    font-weight: 600;
}

/* Paper URLs */
.paper-urls {
    margin: 12px 0;
    padding: 8px 0;
}

.paper-urls a {
    color: #2563eb;
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    margin-right: 16px;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.paper-urls a:hover {
    background-color: #eff6ff;
}

.demo-link,
.project-link {
    background: #eff6ff;
    color: #2563eb;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
    text-decoration: none;
    margin-right: 8px;
    transition: all 0.2s ease;
}

.demo-link:hover,
.project-link:hover {
    background: #dbeafe;
}

/* Loading states and animations */
.paper {
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Top Papers Section */
.top-papers-section {
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    margin: 0 0 32px 0;
    padding: 24px;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(251, 191, 36, 0.3);
    border: 2px solid #f59e0b;
}

.top-papers-title {
    color: #78350f;
    font-size: 24px;
    font-weight: 700;
    margin: 0 0 20px 0;
    text-align: center;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}

.top-paper {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border: 2px solid #f59e0b;
    border-radius: 8px;
    margin: 16px 0;
    padding: 20px;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
    position: relative;
    overflow: hidden;
}

.top-paper::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #fbbf24, #f59e0b, #d97706);
}

.top-paper-1 {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-color: #f59e0b;
}

.top-paper-2 {
    background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
    border-color: #9ca3af;
}

.top-paper-3 {
    background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
    border-color: #f87171;
}

.top-paper-rank {
    color: #78350f;
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 12px;
    padding: 6px 12px;
    background: rgba(251, 191, 36, 0.3);
    border-radius: 20px;
    display: inline-block;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.top-paper .paper-title {
    color: #78350f;
    font-weight: 600;
    font-size: 18px;
}

.top-paper .paper-meta {
    color: #92400e;
}

.top-paper .abstract-preview {
    color: #78350f;
}

.top-paper .abstract-toggle {
    background: #f59e0b;
    color: #78350f;
    font-weight: 600;
}

.top-paper .abstract-toggle:hover {
    background: #d97706;
}