:root{--primary: #2563eb;--primary-hover: #1d4ed8;--bg-sidebar: #1a1b1e;--bg-main: #f8fafc;--bg-card: #ffffff;--sidebar-text: #94a3b8;--sidebar-active: #2c2e33;--sidebar-active-text: #ffffff;--border-color: #e2e8f0;--text-main: #1e293b;--text-muted: #64748b;--accent-purple: #8b5cf6}body{margin:0;font-family:Inter,system-ui,-apple-system,sans-serif;background-color:var(--bg-main);color:var(--text-main)}.app-container{display:flex;height:100vh}.sidebar{width:260px;background-color:var(--bg-sidebar);display:flex;flex-direction:column;padding:1.25rem;flex-shrink:0;color:var(--sidebar-text)}.logo-container{display:flex;align-items:center;gap:.75rem;padding:.5rem;margin-bottom:2rem;color:#fff;font-weight:700;font-size:1.25rem}.logo-icon{width:32px;height:32px;background:linear-gradient(135deg,#3b82f6,#8b5cf6);border-radius:8px}.new-chat-btn{background:linear-gradient(to right,#374151,#1f2937);color:#fff;border:1px solid #4b5563;padding:.75rem;border-radius:10px;font-weight:500;margin-bottom:2rem;cursor:pointer;transition:all .2s}.sidebar-nav-item{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:8px;cursor:pointer;margin-bottom:4px;font-size:.9rem}.sidebar-nav-item:hover{background-color:#ffffff0d;color:#fff}.sidebar-nav-item.active{background-color:var(--sidebar-active);color:#fff}.sidebar-section-title{font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;margin:1.5rem 0 .75rem .75rem;font-weight:600;color:#4b5563}.main-viewport{flex:1;display:flex;flex-direction:column;overflow:hidden;background-color:#fff;margin:12px;border-radius:16px;box-shadow:0 4px 20px #0000000d;border:1px solid var(--border-color)}.chat-input-container{padding:24px;background:#fff;border-top:1px solid var(--border-color)}.chat-input-wrapper{background:#f8fafc;border:1px solid var(--border-color);border-radius:12px;padding:12px 16px;display:flex;align-items:center;gap:12px}.chat-input{flex:1;background:transparent;border:none;outline:none;font-size:.95rem;padding:8px 0}.chat-action-btn{background:var(--primary);color:#fff;border:none;width:36px;height:36px;border-radius:8px;display:flex;align-items:center;justify-content:center;cursor:pointer}.suggestion-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px;padding:20px}.article-card{background:#fff;border:1px solid var(--border-color);border-radius:12px;padding:20px;transition:transform .2s,box-shadow .2s;cursor:pointer}.article-card:hover{transform:translateY(-2px);box-shadow:0 10px 15px -3px #0000001a}.home-container{flex:1;display:flex;flex-direction:column;padding:4rem 2rem;max-width:1000px;margin:0 auto}.section-title{font-size:2.5rem;font-weight:800;color:#0f172a;margin-bottom:2rem;letter-spacing:-.02em}.topic-input-container{background:#fff;border:1px solid var(--border-color);border-radius:16px;padding:1.5rem;box-shadow:0 4px 6px -1px #0000000d;margin-bottom:3rem}.topic-input{width:100%;border:none;font-size:1.2rem;color:var(--text-main);background:transparent;outline:none;margin-bottom:1rem}.topic-input::placeholder{color:#94a3b8}.input-footer{display:flex;justify-content:space-between;align-items:center}.search-pill{display:flex;align-items:center;gap:8px;background:#f1f5f9;padding:6px 14px;border-radius:100px;font-size:.85rem;font-weight:600;color:#475569}.submit-arrow{background:#e2e8f0;color:#94a3b8;width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;border:none;cursor:pointer;transition:all .2s}.submit-arrow.active{background:var(--primary);color:#fff;box-shadow:0 4px 12px #2563eb4d}.progress-card{background:#fff;border:1px solid var(--border-color);border-radius:16px;padding:2.5rem;max-width:800px;margin:0 auto;box-shadow:0 10px 15px -3px #0000000d}.panel-container{padding:2rem;max-width:1000px;margin:0 auto}.library-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem}.library-item{border-bottom:1px solid var(--border-color);padding:1.5rem 0;transition:background-color .2s;cursor:pointer}.library-item:hover{background-color:#f8fafc}.library-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}.library-card{background:#fff;border-radius:16px;padding:24px;border:1px solid var(--border-color);position:relative;transition:all .2s ease;cursor:pointer}.library-card:hover{transform:translateY(-4px);box-shadow:0 12px 20px -5px #0000001a}.card-header{display:flex;gap:8px;align-items:center;margin-bottom:12px}.card-year{background:#f1f5f9;padding:2px 8px;border-radius:6px;font-size:.75rem;font-weight:600;color:#64748b}.card-category{color:#94a3b8;font-size:.85rem}.card-title{font-size:1.25rem;font-weight:700;color:#1e293b;margin-bottom:8px;line-height:1.3}.card-authors{font-size:.9rem;color:#64748b;line-height:1.4}.card-footer{display:flex;justify-content:space-between;align-items:center;margin-top:24px}.card-stats{display:flex;align-items:center;gap:12px;color:#94a3b8;font-size:.85rem}.category-dot{width:8px;height:8px;border-radius:50%;margin-right:12px}.library-tab-nav{display:flex;gap:2rem;border-bottom:1px solid var(--border-color);margin-bottom:2rem}.library-tab{padding:.75rem 0;border:none;background:transparent;color:var(--text-muted);font-weight:500;cursor:pointer;border-bottom:2px solid transparent}.library-tab.active{color:var(--primary);border-bottom-color:var(--primary)}.article-view-layout{display:flex;padding:2rem;gap:4rem;max-width:1400px;margin:0 auto}.article-toc{width:250px;position:sticky;top:100px;align-self:flex-start}.article-body{flex:1;line-height:1.6;color:#334155}.article-section{margin-bottom:3rem}.article-section h2{color:#0f172a;border-bottom:1px solid var(--border-color);padding-bottom:.5rem;margin-bottom:1.5rem;font-weight:700}