:root{--bg-primary: #0f1419;--bg-secondary: #1a1f2e;--bg-tertiary: #252d3d;--text-primary: #e6edf3;--text-secondary: #8b949e;--accent: #2f81f7;--accent-hover: #1f6feb;--border: #30363d;--success: #3fb950;--error: #f85149}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--bg-primary);color:var(--text-primary);line-height:1.6}.app{min-height:100vh}.navbar{background:var(--bg-secondary);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}.nav-container{max-width:1200px;margin:0 auto;padding:16px 24px}.logo{display:flex;align-items:center;gap:12px;font-size:18px;font-weight:600}.logo-icon{font-size:24px}.logo-text{color:var(--text-primary)}.hero{padding:60px 24px 40px;text-align:center}.hero-content{max-width:700px;margin:0 auto}.hero-title{font-size:42px;font-weight:700;margin-bottom:16px;background:linear-gradient(135deg,var(--accent) 0%,#8b5cf6 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-subtitle{font-size:18px;color:var(--text-secondary)}.content{max-width:900px;margin:0 auto;padding:0 24px 80px}.search-container{margin-bottom:32px}.search-form{display:flex;gap:12px;margin-bottom:16px}.search-input{flex:1;padding:14px 20px;font-size:16px;background:var(--bg-secondary);border:2px solid var(--border);border-radius:12px;color:var(--text-primary);outline:none;transition:all .2s}.search-input:focus{border-color:var(--accent);background:var(--bg-tertiary)}.search-input::placeholder{color:var(--text-secondary)}.search-btn{padding:14px 32px;font-size:16px;font-weight:600;background:var(--accent);color:#fff;border:none;border-radius:12px;cursor:pointer;transition:all .2s;display:flex;align-items:center;gap:8px}.search-btn:hover:not(:disabled){background:var(--accent-hover);transform:translateY(-1px)}.search-btn:disabled{opacity:.6;cursor:not-allowed}.spinner{width:16px;height:16px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.alert{padding:12px 16px;border-radius:8px;font-size:14px}.alert-error{background:#f851491a;border:1px solid var(--error);color:var(--error)}.results-container{animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.results-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px;gap:16px}.results-topic{font-size:28px;font-weight:700;color:var(--accent)}.btn-secondary{padding:10px 20px;font-size:14px;font-weight:500;background:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--border);border-radius:8px;cursor:pointer;transition:all .2s}.btn-secondary:hover{background:var(--bg-secondary);border-color:var(--text-secondary)}.card{background:var(--bg-secondary);border:1px solid var(--border);border-radius:12px;margin-bottom:20px;overflow:hidden}.card-header{padding:16px 20px;border-bottom:1px solid var(--border)}.card-header h3{font-size:16px;font-weight:600;color:var(--text-primary)}.card-body{padding:20px}.summary{font-size:15px;line-height:1.7;color:var(--text-primary);white-space:pre-wrap}.sources{display:flex;flex-direction:column;gap:10px}.source-item{display:flex;gap:12px;padding:12px 16px;background:var(--bg-tertiary);border-radius:8px;font-size:14px;transition:all .2s}.source-item:hover{background:var(--bg-primary)}.source-num{font-weight:700;color:var(--accent);min-width:20px}.tools-used{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:16px 0}.tools-label{font-size:13px;color:var(--text-secondary);font-weight:500}.tool-tag{padding:4px 12px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:16px;font-size:12px;color:var(--text-secondary)}.empty-state{text-align:center;padding:60px 24px}.empty-icon{font-size:64px;margin-bottom:20px}.empty-state h3{font-size:24px;margin-bottom:8px}.empty-state p{font-size:16px;color:var(--text-secondary);margin-bottom:48px}.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:24px;max-width:500px;margin:0 auto}.feature{text-align:center}.feature-icon{font-size:32px;margin-bottom:8px}.feature-text{font-size:14px;color:var(--text-secondary);font-weight:500}@media (max-width: 768px){.hero-title{font-size:32px}.hero-subtitle{font-size:16px}.search-form{flex-direction:column}.search-btn{justify-content:center}.results-header{flex-direction:column;align-items:flex-start}.results-topic{font-size:24px}}.loading-box{margin-top:20px;padding:24px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:12px;text-align:center}.loading-dots{display:flex;justify-content:center;align-items:center;gap:8px;margin-bottom:12px}.loading-dots span{width:10px;height:10px;background:var(--accent);border-radius:50%;animation:bounce 1.4s infinite ease-in-out both}.loading-dots span:nth-child(1){animation-delay:-.32s}.loading-dots span:nth-child(2){animation-delay:-.16s}@keyframes bounce{0%,80%,to{transform:scale(0);opacity:.5}40%{transform:scale(1);opacity:1}}.loading-box p{color:var(--text-secondary);font-size:14px;margin:0}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:#0f1419;color:#e6edf3;min-height:100vh}#root{width:100%;min-height:100vh}