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var(--border-color);border-radius:var(--radius-md);color:var(--text-secondary);font-size:.875rem;cursor:pointer;transition:all .2s ease;text-decoration:none}.btn-action:hover{background:var(--bg-secondary);color:var(--text-primary)}.btn-action.liked{color:#ef4444;border-color:#ef4444}.paper-keywords{display:flex;flex-wrap:wrap;gap:var(--spacing-sm);margin-bottom:var(--spacing-lg)}.paper-section{margin-bottom:var(--spacing-xl)}.paper-section h2{font-size:1.25rem;font-weight:600;color:var(--text-primary);margin:0 0 var(--spacing-md) 0;padding-bottom:var(--spacing-sm);border-bottom:2px solid var(--accent-primary);display:inline-block}.paper-abstract{color:var(--text-secondary);line-height:1.8;font-size:1.05rem;margin:0}.paper-content{color:var(--text-primary);line-height:1.8;white-space:pre-wrap}.loading-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;gap:var(--spacing-md);color:var(--text-secondary)}.loading-spinner,.spinner{animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}