:root{--bubble-user:#2563eb;--bubble-user-text:#fff;--bubble-assistant:#f3f4f6}.app-shell{height:100vh;display:flex;position:relative;overflow:hidden}.sidebar{background:var(--sidebar-bg);border-right:1px solid var(--border);z-index:30;flex-direction:column;flex-shrink:0;width:280px;transition:margin-left .25s;display:flex}.sidebar.closed{margin-left:-280px}.sidebar-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:14px 16px;display:flex}.sidebar-header h2{margin:0;font-size:15px}.sidebar-content{flex:1;padding:12px 16px;overflow-y:auto}.sidebar-content label{color:var(--muted);margin:10px 0 4px;font-size:12px;display:block}.sidebar-content select,.sidebar-content input[type=text]{border:1px solid var(--border);background:#fff;border-radius:8px;width:100%;padding:8px 10px;font-size:13px}.sidebar-content input[type=range]{width:100%}.sidebar-content hr{border:none;border-top:1px solid var(--border);margin:16px 0}.section-title{color:var(--muted);margin:10px 0 8px;font-size:13px}.muted{color:var(--muted);font-size:13px}.user-info{font-size:13px}.sidebar-overlay{display:none}@media (max-width:768px){.sidebar{position:fixed;top:0;bottom:0;left:0;box-shadow:2px 0 12px #00000026}.sidebar.closed{margin-left:-280px}.sidebar-overlay{z-index:20;background:#00000059;display:block;position:fixed;inset:0}}.list-item.active{font-weight:500}.list-item span{text-overflow:ellipsis;white-space:nowrap;max-width:190px;overflow:hidden}.main{flex-direction:column;flex:1;min-width:0;height:100vh;display:flex}.top-bar{border-bottom:1px solid var(--border);align-items:center;gap:10px;padding:10px 16px;display:flex}.banner{color:var(--muted);background:#f3f4f6;border-radius:20px;padding:6px 12px;font-size:13px}.banner.user{color:#065f46;background:#ecfdf5}.banner.guest{color:#9a3412;background:#fff7ed}.chat-scroll{flex:1;padding:24px 16px 8px;overflow-y:auto}.empty-state{text-align:center;color:var(--muted);margin-top:15vh}.empty-state h1{color:var(--text);margin-bottom:8px;font-size:24px}.message-row{gap:12px;max-width:820px;margin:0 auto 24px;display:flex}.avatar{background:var(--bubble-assistant);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;font-size:16px;display:flex}.avatar.user{background:var(--bubble-user)}.message-body{flex:1;min-width:0}.role-label{color:var(--muted);margin-bottom:4px;font-size:12px;font-weight:600}.markdown-content{word-wrap:break-word;overflow-wrap:break-word;font-size:15px;line-height:1.65}.markdown-content p{margin:0 0 10px}.markdown-content p:last-child{margin-bottom:0}.markdown-content ul,.markdown-content ol{margin:0 0 10px;padding-left:22px}.markdown-content li{margin-bottom:4px}.markdown-content code{background:#f1f5f9;border-radius:4px;padding:2px 6px;font-family:SFMono-Regular,Consolas,Menlo,monospace;font-size:13px}.markdown-content pre{color:#e2e8f0;background:#1e1e2e;border-radius:8px;margin:0 0 10px;padding:12px 14px;overflow-x:auto}.markdown-content pre code{color:inherit;background:0 0;padding:0}.markdown-content table{border-collapse:collapse;width:100%;margin:0 0 10px;font-size:14px}.markdown-content th,.markdown-content td{border:1px solid var(--border);text-align:left;padding:6px 10px}.markdown-content th{background:#f9fafb}.markdown-content a{color:var(--accent)}.markdown-content blockquote{border-left:3px solid var(--border);color:var(--muted);margin:0 0 10px;padding:2px 12px}.markdown-content h1,.markdown-content h2,.markdown-content h3{margin:14px 0 8px}.typing-cursor{animation:1s step-start infinite blink}@keyframes blink{50%{opacity:0}}.input-bar{border-top:1px solid var(--border);background:var(--bg);padding:14px 16px 20px}.input-form{border:1px solid var(--border);background:#fff;border-radius:16px;align-items:flex-end;gap:8px;max-width:820px;margin:0 auto;padding:8px 8px 8px 16px;display:flex;box-shadow:0 1px 3px #0000000d}.input-form:focus-within{border-color:var(--accent)}.input-form textarea{resize:none;word-wrap:break-word;white-space:pre-wrap;background:0 0;border:none;outline:none;flex:1;max-height:200px;padding:6px 0;font-family:inherit;font-size:15px;line-height:1.5}.send-btn{border-radius:50%;flex-shrink:0;width:36px;height:36px;padding:0;font-size:16px}