:root{--bg: #ffffff;--bg-color: #ffffff;--bg-secondary: #f8f9fa;--fg: #0f172a;--text-color: #0f172a;--muted: #475569;--text-secondary: #475569;--border: #e2e8f0;--border-color: #e2e8f0;--link: #2563eb;--accent-color: #2563eb;--accent-hover: #1d4ed8;--code-bg: #f1f5f9;--success-color: #10b981;--danger-color: #ef4444;--warning-color: #f59e0b;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1);--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--base-font-size: 16px}[data-theme=dark]{--bg: #0b1220;--bg-color: #0b1220;--bg-secondary: #1f2937;--fg: #e5e7eb;--text-color: #e5e7eb;--muted: #94a3b8;--text-secondary: #94a3b8;--border: #1f2a44;--border-color: #1f2a44;--link: #60a5fa;--accent-color: #60a5fa;--accent-hover: #3b82f6;--code-bg: #0f1b33;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .4);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 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.75rem;background-color:var(--bg-secondary);color:var(--accent-color);border-radius:var(--radius-sm);font-size:.875rem;font-weight:500;border:1px solid var(--border-color)}.paper-actions{display:flex;gap:.75rem;margin-top:.5rem}.btn-primary{display:inline-flex;align-items:center;gap:.5rem;padding:.75rem 1.5rem;background-color:var(--accent-color);color:#fff;text-decoration:none;border-radius:var(--radius-md);font-weight:500;transition:background-color .2s ease,transform .1s ease;border:none;cursor:pointer;font-size:1rem}.btn-primary:hover{background-color:var(--accent-hover);transform:translateY(-1px)}.btn-primary:active{transform:translateY(0)}.loading{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:400px;gap:1rem}.spinner{width:48px;height:48px;border:4px solid var(--border-color);border-top-color:var(--accent-color);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading 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solid var(--border-color)}.back-link{display:inline-flex;align-items:center;gap:.5rem;color:var(--accent-color);text-decoration:none;font-size:.875rem;margin-bottom:1.5rem;transition:color .2s ease}.back-link:hover{color:var(--accent-hover);text-decoration:underline}.paper-header h1{font-size:2.5rem;font-weight:700;color:var(--text-color);margin-bottom:1rem;line-height:1.2}.paper-header .paper-meta{display:flex;gap:1.5rem;font-size:1rem;color:var(--text-secondary)}.paper-content{color:var(--text-color);line-height:1.8;font-size:1.0625rem}.paper-content h1{font-size:2rem;font-weight:700;margin-top:3rem;margin-bottom:1.5rem;color:var(--text-color);line-height:1.3;border-bottom:2px solid var(--border-color);padding-bottom:.5rem}.paper-content h2{font-size:1.5rem;font-weight:600;margin-top:2.5rem;margin-bottom:1rem;color:var(--text-color);line-height:1.4}.paper-content h3{font-size:1.25rem;font-weight:600;margin-top:2rem;margin-bottom:.75rem;color:var(--text-color)}.paper-content p{margin-bottom:1.25rem;color:var(--text-color)}.paper-content ul,.paper-content ol{margin-bottom:1.25rem;padding-left:2rem}.paper-content li{margin-bottom:.5rem}.paper-content a{color:var(--accent-color);text-decoration:none;border-bottom:1px solid transparent;transition:border-color .2s ease}.paper-content a:hover{border-bottom-color:var(--accent-color)}.paper-content code{background-color:var(--bg-secondary);padding:.2rem .4rem;border-radius:var(--radius-sm);font-size:.9em;font-family:Consolas,Monaco,Courier New,monospace;color:var(--text-color)}.paper-content pre{background-color:var(--bg-secondary);padding:1rem;border-radius:var(--radius-md);overflow-x:auto;margin-bottom:1.25rem;border:1px solid var(--border-color)}.paper-content pre code{background-color:transparent;padding:0}.paper-content blockquote{border-left:4px solid var(--accent-color);padding-left:1.5rem;margin:1.5rem 0;font-style:italic;color:var(--text-secondary)}.paper-content table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}.paper-content th,.paper-content td{padding:.75rem;border:1px solid var(--border-color);text-align:left}.paper-content th{background-color:var(--bg-secondary);font-weight:600}.paper-content img{max-width:100%;height:auto;border-radius:var(--radius-md);margin:1.5rem 0}.error-state{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;gap:1.5rem;padding:2rem;text-align:center}.error-state i{font-size:4rem;color:var(--warning-color)}.error-state h2{font-size:2rem;color:var(--text-color);margin:0}.error-state p{color:var(--text-secondary);font-size:1.125rem;max-width:500px}@media(max-width:768px){.paper-viewer-content{padding:1rem}.paper-header h1{font-size:1.75rem}.paper-content h1{font-size:1.5rem}.paper-content h2{font-size:1.25rem}.paper-content{font-size:1rem}}