:root{--bg: #ffffff;--bg-soft: #fafaf9;--bg-sidebar: #f7f7f5;--bg-hover: #f0efed;--bg-message-user: #f7f7f5;--border: #e8e7e3;--border-soft: #efeeea;--text: #1c1b1a;--text-muted: #6b6a66;--text-faint: #9a9994;--accent: #1c1b1a;--accent-hover: #000;--brand: #2e6b4f;--brand-soft: #e8f0eb;--green: #16a34a;--amber: #d97706;--red: #dc2626;--shadow-sm: 0 1px 2px rgba(0,0,0,.04);--shadow-md: 0 2px 8px rgba(0,0,0,.06);--shadow-lg: 0 8px 24px rgba(0,0,0,.08);--radius: 10px;--radius-sm: 6px;--radius-lg: 14px}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;width:100%}body{background:var(--bg);color:var(--text);font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:14px;line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow:hidden}button{font-family:inherit;border:none;background:none;cursor:pointer;color:inherit}input,textarea{font-family:inherit;font-size:inherit;color:inherit}a{color:var(--brand);text-decoration:none;cursor:pointer}a:hover{text-decoration:underline}::selection{background:var(--brand-soft);color:var(--text)}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#d8d7d3;border-radius:10px;border:2px solid var(--bg)}::-webkit-scrollbar-thumb:hover{background:#b8b7b3}.login{display:flex;align-items:center;justify-content:center;height:100vh;background:linear-gradient(135deg,#fafaf9,#f0efed);padding:20px}.login-box{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:40px 44px;width:100%;max-width:420px;box-shadow:var(--shadow-lg)}.login-brand{display:flex;align-items:center;gap:14px;margin-bottom:32px}.login-logo{width:48px;height:48px;border-radius:12px;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center}.login-title{font-size:22px;font-weight:700;letter-spacing:-.02em}.login-subtitle{font-size:12px;color:var(--text-muted);margin-top:2px}.login label{display:block;font-size:13px;font-weight:500;margin-bottom:8px;color:var(--text)}.login input{width:100%;padding:11px 14px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:14px;outline:none;transition:all .15s;background:var(--bg)}.login input:focus{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}.login button[type=submit]{width:100%;margin-top:16px;padding:11px;background:var(--accent);color:#fff;border-radius:var(--radius-sm);font-size:14px;font-weight:500;transition:background .15s}.login button[type=submit]:hover{background:var(--accent-hover)}.login-footer{margin-top:28px;padding-top:20px;border-top:1px solid var(--border-soft);font-size:12px;color:var(--text-faint);line-height:1.7;text-align:center}.app{display:grid;grid-template-columns:240px 1fr;height:100vh}.sidebar{background:var(--bg-sidebar);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:14px;overflow-y:auto}.sidebar-brand{display:flex;align-items:center;gap:10px;padding:6px 8px;margin-bottom:18px}.brand-logo{width:32px;height:32px;border-radius:8px;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0}.brand-text{min-width:0}.brand-name{font-weight:600;font-size:14px;letter-spacing:-.01em}.brand-team{font-size:11px;color:var(--text-muted);margin-top:-1px}.new-chat-btn{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;padding:10px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:13px;font-weight:500;color:var(--text);margin-bottom:22px;transition:all .15s;box-shadow:var(--shadow-sm)}.new-chat-btn:hover{background:var(--bg-hover);border-color:#d8d7d3}.sidebar-section{margin-bottom:22px}.sidebar-section-title{font-size:11px;font-weight:600;color:var(--text-faint);text-transform:uppercase;letter-spacing:.06em;padding:0 8px 8px}.sidebar-item{display:flex;align-items:center;gap:9px;padding:7px 8px;border-radius:var(--radius-sm);font-size:13px;color:var(--text-muted);cursor:pointer;transition:all .12s}.sidebar-item:hover{background:var(--bg-hover);color:var(--text)}.sidebar-item.active{background:var(--bg-hover);color:var(--text);font-weight:500}.sidebar-item svg{flex-shrink:0;opacity:.7}.sidebar-spacer{flex:1}.user-card{display:flex;align-items:center;gap:10px;padding:12px 8px 8px;border-radius:var(--radius-sm);cursor:pointer;transition:background .12s;border-top:1px solid var(--border-soft);margin-top:8px}.user-card:hover{background:var(--bg-hover)}.user-avatar{width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,var(--brand) 0%,#1f5039 100%);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:13px;flex-shrink:0}.user-info{flex:1;min-width:0}.user-name{font-size:13px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-status{display:flex;align-items:center;gap:5px;font-size:11px;color:var(--text-muted);margin-top:1px}.status-dot{width:6px;height:6px;border-radius:50%;background:var(--green)}.main{display:flex;flex-direction:column;height:100vh;overflow:hidden;background:var(--bg)}.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;border-bottom:1px solid var(--border-soft);background:var(--bg)}.topbar-left{display:flex;align-items:center;gap:14px}.chat-title{font-size:15px;font-weight:600;letter-spacing:-.01em}.chat-meta{display:flex;align-items:center;gap:8px}.model-badge{display:inline-flex;align-items:center;gap:6px;padding:3px 10px;background:var(--brand-soft);color:var(--brand);border-radius:100px;font-size:11px;font-weight:500}.model-dot{width:6px;height:6px;border-radius:50%;background:var(--green)}.topbar-right{display:flex;gap:4px}.icon-btn{width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm);color:var(--text-muted);transition:all .12s}.icon-btn:hover{background:var(--bg-hover);color:var(--text)}.chat-area{flex:1;overflow-y:auto;padding:24px 0}.welcome{max-width:720px;margin:60px auto 0;padding:40px 32px;text-align:center}.welcome-icon{width:72px;height:72px;margin:0 auto 24px;border-radius:18px;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center}.welcome-title{font-size:30px;font-weight:700;letter-spacing:-.025em;margin-bottom:10px}.welcome-sub{font-size:15px;color:var(--text-muted);margin-bottom:36px;line-height:1.55}.suggestions{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;max-width:560px;margin:0 auto}.suggestion-card{padding:14px 16px;border:1px solid var(--border);border-radius:var(--radius);background:var(--bg);font-size:13px;text-align:left;color:var(--text);transition:all .15s}.suggestion-card:hover{border-color:var(--brand);background:var(--brand-soft);transform:translateY(-1px);box-shadow:var(--shadow-sm)}.messages{max-width:760px;margin:0 auto;padding:0 24px}.message{display:flex;gap:14px;margin-bottom:24px;animation:msgIn .25s ease-out}@keyframes msgIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.message-avatar{width:30px;height:30px;border-radius:8px;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:600}.assistant-avatar{background:var(--brand);color:#fff}.user-avatar-msg{background:linear-gradient(135deg,var(--brand) 0%,#1f5039 100%);color:#fff}.message-body{flex:1;min-width:0}.message-name{font-size:13px;font-weight:600;margin-bottom:4px;letter-spacing:-.01em}.message-content{font-size:14px;line-height:1.65;color:var(--text);white-space:pre-wrap;word-wrap:break-word}.message-content code{background:var(--bg-soft);border:1px solid var(--border-soft);padding:1px 6px;border-radius:4px;font-family:JetBrains Mono,ui-monospace,monospace;font-size:13px;color:#b91c1c}.message.system .message-name{color:var(--red)}.message.system .message-body{color:var(--text-muted);font-style:italic}.attachment-chip{display:inline-flex;align-items:center;gap:7px;margin-top:10px;padding:6px 10px;background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:12px;color:var(--text-muted)}.thinking{display:inline-flex;align-items:center;gap:4px;padding:6px 0}.thinking span{width:6px;height:6px;background:var(--text-faint);border-radius:50%;animation:dots 1.3s ease-in-out infinite}.thinking span:nth-child(2){animation-delay:.18s}.thinking span:nth-child(3){animation-delay:.36s}@keyframes dots{0%,80%,to{opacity:.3;transform:scale(.8)}40%{opacity:1;transform:scale(1)}}.composer-wrap{padding:16px 24px 18px;background:var(--bg);border-top:1px solid var(--border-soft)}.composer{max-width:760px;margin:0 auto;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-lg);transition:border-color .15s,box-shadow .15s;box-shadow:var(--shadow-sm);overflow:hidden}.composer:focus-within{border-color:#c8c7c3;box-shadow:var(--shadow-md)}.composer-attachment{display:flex;align-items:center;gap:10px;padding:10px 12px;margin:8px;background:var(--bg-soft);border:1px solid var(--border-soft);border-radius:var(--radius-sm)}.att-icon{width:28px;height:28px;border-radius:6px;background:var(--brand-soft);color:var(--brand);display:flex;align-items:center;justify-content:center;flex-shrink:0}.att-info{flex:1;min-width:0}.att-name{font-size:12px;font-weight:500}.att-meta{font-size:11px;color:var(--text-muted);margin-top:1px}.att-edit,.att-remove{width:26px;height:26px;border-radius:5px;display:flex;align-items:center;justify-content:center;color:var(--text-muted);transition:all .12s}.att-edit:hover,.att-remove:hover{background:var(--bg-hover);color:var(--text)}.attach-panel{border-bottom:1px solid var(--border-soft);background:var(--bg-soft)}.attach-header{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;border-bottom:1px solid var(--border-soft);font-size:12px;font-weight:500;color:var(--text-muted)}.attach-header button{width:22px;height:22px;display:flex;align-items:center;justify-content:center;border-radius:4px;color:var(--text-muted)}.attach-header button:hover{background:var(--bg-hover)}.attach-textarea{width:100%;min-height:140px;max-height:260px;padding:12px 14px;border:none;outline:none;background:transparent;font-family:JetBrains Mono,ui-monospace,monospace;font-size:12.5px;line-height:1.55;resize:vertical;color:var(--text)}.attach-textarea::placeholder{color:var(--text-faint)}.attach-footer{display:flex;align-items:center;justify-content:space-between;padding:8px 14px 10px;border-top:1px solid var(--border-soft)}.attach-hint{font-size:11px;color:var(--text-muted)}.attach-done{padding:5px 12px;background:var(--accent);color:#fff;border-radius:var(--radius-sm);font-size:12px;font-weight:500;transition:background .12s}.attach-done:hover{background:var(--accent-hover)}.composer-input-row{display:flex;align-items:flex-end;gap:4px;padding:8px 8px 8px 4px}.composer-btn{width:36px;height:36px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm);color:var(--text-muted);flex-shrink:0;transition:all .12s}.composer-btn:hover{background:var(--bg-hover);color:var(--text)}.composer-input{flex:1;border:none;outline:none;background:transparent;font-size:14px;line-height:1.55;padding:8px 4px;resize:none;min-height:24px;max-height:160px;font-family:inherit;color:var(--text)}.composer-input::placeholder{color:var(--text-faint)}.send-btn{width:32px;height:32px;border-radius:8px;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:all .15s}.send-btn:hover:not(:disabled){background:var(--accent-hover);transform:translateY(-1px)}.send-btn:disabled{background:var(--border);color:var(--text-faint);cursor:not-allowed}.composer-footer{max-width:760px;margin:8px auto 0;font-size:11px;color:var(--text-faint);text-align:center}@media (max-width: 768px){.app{grid-template-columns:1fr}.sidebar{display:none}.welcome{margin-top:20px;padding:24px 16px}.welcome-title{font-size:24px}.suggestions{grid-template-columns:1fr}.messages{padding:0 16px}.composer-wrap{padding:0 16px 14px}}