:root{--primary: #3b82f6;--primary-light: #eff6ff;--bg: #f8fafc;--text-main: #1e293b;--text-sub: #64748b;--shadow: 0 10px 25px -5px rgba(0, 0, 0, .05), 0 8px 10px -6px rgba(0, 0, 0, .05)}body{margin:0;font-family:Inter,-apple-system,sans-serif;background-color:var(--bg);color:var(--text-main)}.app-container{max-width:800px;margin:0 auto;min-height:100vh;display:flex;flex-direction:column;padding:0 20px}.main-header{display:flex;justify-content:space-between;align-items:center;padding:24px 0}.logo-section{display:flex;align-items:center;gap:12px}.icon-bg{background:#fff;padding:10px;border-radius:12px;box-shadow:var(--shadow)}.logo-section h1{font-size:20px;font-weight:800;margin:0;background:linear-gradient(135deg,#1e293b,#3b82f6);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.sync-badge{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--text-sub);background:#fff;padding:6px 12px;border-radius:20px;border:1px solid #e2e8f0}.syncing{color:var(--primary);animation:pulse 2s infinite}@keyframes pulse{0%{opacity:1}50%{opacity:.5}to{opacity:1}}.search-hero{display:flex;flex-direction:column;align-items:center;padding:40px 0}.input-wrapper{position:relative;width:100%;max-width:600px;margin-top:24px}.input-wrapper input{width:100%;padding:18px 60px 18px 24px;border-radius:16px;border:2px solid transparent;background:#fff;box-shadow:var(--shadow);font-size:16px;transition:all .3s;box-sizing:border-box}.input-wrapper input:focus{outline:none;border-color:var(--primary);transform:translateY(-2px)}.send-btn{position:absolute;right:10px;top:50%;transform:translateY(-50%);background:var(--primary);color:#fff;border:none;width:44px;height:44px;border-radius:12px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s}.send-btn:hover{background:#2563eb;transform:translateY(-50%) scale(1.05)}.send-btn:disabled{background:#cbd5e1;cursor:not-allowed}.suggestions{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap;justify-content:center}.suggest-chip{background:#fff;border:1px solid #e2e8f0;padding:8px 16px;border-radius:20px;font-size:13px;color:var(--text-sub);cursor:pointer;display:flex;align-items:center;gap:6px;transition:all .2s}.suggest-chip:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-light)}.answer-card{background:#fff;border-radius:24px;padding:32px;box-shadow:var(--shadow);margin-bottom:40px;border:1px solid rgba(59,130,246,.1)}.q-header{margin-bottom:24px}.q-tag{font-size:12px;font-weight:700;color:var(--primary);text-transform:uppercase;letter-spacing:1px;background:var(--primary-light);padding:4px 8px;border-radius:6px}.q-header h3{margin:12px 0 0;font-size:24px;color:var(--text-main)}.a-body{line-height:1.8;color:#334155;font-size:17px}.markdown-content{white-space:pre-wrap}.loading-placeholder{display:flex;flex-direction:column;gap:12px}.skeleton-line{height:14px;background:#f1f5f9;border-radius:7px;width:100%;animation:shimmer 1.5s infinite linear}.skeleton-line.short{width:60%}@keyframes shimmer{0%{opacity:.5}50%{opacity:1}to{opacity:.5}}.history-toggle{position:fixed;right:30px;bottom:30px;width:60px;height:60px;border-radius:30px;background:var(--primary);color:#fff;border:none;box-shadow:0 10px 20px #3b82f64d;cursor:pointer;display:flex;align-items:center;justify-content:center;z-index:100}.history-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a66;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;display:flex;justify-content:flex-end}.history-sidebar{width:100%;max-width:350px;background:#fff;height:100%;padding:30px;box-sizing:border-box;display:flex;flex-direction:column}.sidebar-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.clear-btn{background:none;border:none;color:#ef4444;cursor:pointer;padding:8px;border-radius:8px}.clear-btn:hover{background:#fef2f2}.history-list{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:16px}.history-item{padding:16px;border-radius:12px;background:var(--bg);cursor:pointer;transition:all .2s;border:1px solid transparent}.history-item:hover{background:#fff;border-color:var(--primary);box-shadow:var(--shadow)}.h-q{font-weight:600;margin:0 0 4px;font-size:14px}.h-a{font-size:12px;color:var(--text-sub);margin:0}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:200px;color:var(--text-sub);gap:12px}.footer{text-align:center;padding:40px 0;color:var(--text-sub);font-size:14px}.spin{animation:rotate 1s linear infinite}@keyframes rotate{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.robot-svg{filter:drop-shadow(0 10px 15px rgba(59,130,246,.2))}