:root{--bg-primary:#ffffff;--bg-secondary:#f7f8fa;--bg-tertiary:#eef0f3;--bg-hover:#e9ebef;--bg-active:#e3e6ea;--text-primary:#1f2329;--text-secondary:#646a73;--text-tertiary:#8f959e;--border-color:#e5e6eb;--accent:#4e7bef;--accent-hover:#3a6bdb;--accent-light:#eaf1ff;--accent-gradient:linear-gradient(135deg, #667eea 0%, #4e7bef 100%);--success:#00b42a;--warning:#ff9a2e;--error:#f53f3f;--shadow-sm:0 1px 3px rgba(0,0,0,0.04);--shadow-md:0 4px 16px rgba(0,0,0,0.06);--shadow-lg:0 8px 24px rgba(78,123,239,0.12);--radius:12px;--radius-sm:8px;--radius-lg:16px;--font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;--font-mono:"JetBrains Mono","Fira Code",Consolas,Monaco,monospace}[data-theme=dark]{--bg-primary:#1a1a1a;--bg-secondary:#161616;--bg-tertiary:#232323;--bg-hover:#2a2a2a;--bg-active:#333333;--text-primary:#e8e8e8;--text-secondary:#a8a8a8;--text-tertiary:#707070;--border-color:#2a2a2a;--accent:#5a8aff;--accent-hover:#4a7aef;--accent-light:#1a2238;--accent-gradient:linear-gradient(135deg, #667eea 0%, #5a8aff 100%);--shadow-sm:0 1px 3px rgba(0,0,0,0.2);--shadow-md:0 4px 16px rgba(0,0,0,0.3);--shadow-lg:0 8px 24px rgba(0,0,0,0.4)}*{margin:0;padding:0;box-sizing:border-box}.toast{position:fixed;top:20px;left:50%;transform:translateX(-50%) translateY(-100px);background:var(--text-primary);color:var(--bg-primary);padding:10px 20px;border-radius:var(--radius-sm);font-size:13px;box-shadow:var(--shadow-lg);z-index:9999;opacity:0;transition:.3s;pointer-events:none;max-width:90vw}.toast.show{transform:translateX(-50%) translateY(0);opacity:1}.toast.error{background:var(--error);color:#fff}.toast.warn{background:var(--warning);color:#fff}body,html{height:100%;font-family:var(--font);background:var(--bg-secondary);color:var(--text-primary);font-size:14px;line-height:1.6;-webkit-font-smoothing:antialiased}.app{display:flex;flex-direction:column;height:100vh}.header{display:flex;justify-content:space-between;align-items:center;padding:0 24px;height:56px;background:var(--bg-primary);border-bottom:1px solid var(--border-color);box-shadow:var(--shadow-sm);z-index:10}.header-left{display:flex;align-items:center;gap:12px}.menu-toggle{display:none;width:34px;height:34px;border:none;border-radius:var(--radius-sm);background:var(--bg-tertiary);color:var(--text-secondary);cursor:pointer;align-items:center;justify-content:center;transition:.2s}.menu-toggle:hover{background:var(--bg-hover);color:var(--text-primary)}.sidebar-mask{display:none}.logo{width:32px;height:32px;border-radius:10px;overflow:hidden;background:var(--accent-gradient);display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;color:#fff}.title{font-size:16px;font-weight:600;color:var(--text-primary)}.header-right{display:flex;align-items:center;gap:8px}.status-badge{padding:4px 12px;border-radius:20px;font-size:12px;font-weight:500}.status-pending{background:var(--bg-tertiary);color:var(--text-secondary)}.status-indexing{background:#fff3e0;color:var(--warning)}.status-ready{background:#e6ffed;color:var(--success)}.status-error{background:#ffe6e6;color:var(--error)}[data-theme=dark] .status-indexing{background:#3a2a1a}[data-theme=dark] .status-ready{background:#1a3a2a}[data-theme=dark] .status-error{background:#3a1a1a}.btn-icon{width:34px;height:34px;border:none;border-radius:var(--radius-sm);background:var(--bg-tertiary);color:var(--text-secondary);cursor:pointer;font-size:16px;display:flex;align-items:center;justify-content:center;transition:.2s}.btn-icon:hover:not(:disabled){background:var(--bg-hover);color:var(--text-primary);transform:translateY(-1px)}.btn-icon:disabled{opacity:.4;cursor:not-allowed}.blog-link{display:inline-flex;align-items:center;gap:5px;padding:6px 12px;border-radius:var(--radius-sm);background:var(--bg-tertiary);color:var(--text-secondary);font-size:13px;text-decoration:none;transition:.2s}.blog-link:hover{background:var(--accent-light);color:var(--accent);transform:translateY(-1px)}.user-menu{position:relative}.user-avatar{width:34px;height:34px;border:none;border-radius:50%;background:var(--accent-gradient);color:#fff;cursor:pointer;font-size:14px;font-weight:600;display:flex;align-items:center;justify-content:center;transition:.2s;box-shadow:0 2px 6px rgba(0,0,0,.1)}.user-avatar:hover{transform:scale(1.08);box-shadow:0 4px 12px rgba(0,0,0,.18)}.user-card{position:absolute;top:calc(100% + 8px);right:0;min-width:240px;padding:14px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-lg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);opacity:0;visibility:hidden;transform:translateY(-6px);transition:.2s;z-index:1000}.user-menu.open .user-card,.user-menu:hover .user-card{opacity:1;visibility:visible;transform:translateY(0)}.user-card-header{display:flex;align-items:center;gap:12px;padding-bottom:12px;border-bottom:1px solid var(--border)}.user-card-avatar{width:44px;height:44px;border-radius:50%;flex-shrink:0;background:var(--accent-gradient);color:#fff;font-size:18px;font-weight:600;display:flex;align-items:center;justify-content:center}.user-card-info{flex:1;min-width:0}.user-card-name{font-size:14px;font-weight:600;color:var(--text-primary)}.user-card-time{font-size:12px;color:var(--text-tertiary);margin-top:2px}.user-card-logout{width:100%;margin-top:12px;padding:8px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-tertiary);color:var(--text-secondary);font-size:13px;cursor:pointer;transition:.2s;display:flex;align-items:center;justify-content:center;gap:6px}.user-card-logout:hover{background:var(--error);color:#fff;border-color:var(--error)}.main{flex:1;display:flex;overflow:hidden}.sidebar{width:280px;background:var(--bg-primary);border-right:1px solid var(--border-color);display:flex;flex-direction:column;flex-shrink:0}.sidebar-header{padding:16px;border-bottom:1px solid var(--border-color)}.sidebar-header h2{font-size:13px;color:var(--text-tertiary);margin-bottom:10px;font-weight:500}.search-wrap{position:relative}.search-input{width:100%;padding:8px 30px 8px 14px;border:1px solid var(--border-color);border-radius:var(--radius-sm);background:var(--bg-secondary);color:var(--text-primary);font-size:13px;outline:0;transition:.2s}.search-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light)}.search-clear{position:absolute;right:6px;top:50%;transform:translateY(-50%);width:22px;height:22px;border:none;border-radius:50%;background:var(--bg-tertiary);color:var(--text-tertiary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:.15s}.search-clear:hover{background:var(--bg-hover);color:var(--text-primary)}.sidebar-tree{flex:1;overflow-y:auto;padding:8px 0}.chat-section{border-bottom:1px solid var(--border-color);display:flex;flex-direction:column;max-height:220px;flex-shrink:0}.chat-section-header{display:flex;align-items:center;justify-content:space-between;padding:12px 16px 8px}.chat-section-header h2{font-size:13px;color:var(--text-tertiary);font-weight:500;margin:0}.new-chat-btn{width:26px;height:26px;border:none;border-radius:6px;background:var(--bg-tertiary);color:var(--text-secondary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:.15s}.new-chat-btn:hover{background:var(--accent);color:#fff}.chat-list{flex:1;overflow-y:auto;padding:0 8px 8px}.chat-empty{padding:12px;text-align:center;color:var(--text-tertiary);font-size:12px}.chat-item{display:flex;align-items:center;gap:6px;padding:8px 10px;border-radius:var(--radius-sm);cursor:pointer;font-size:13px;color:var(--text-secondary);transition:.15s;margin-bottom:2px}.chat-item:hover{background:var(--bg-hover)}.chat-item.active{background:var(--accent-light);color:var(--accent);font-weight:500}.chat-item-title{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-del{width:20px;height:20px;border:none;border-radius:4px;background:0 0;color:var(--text-tertiary);cursor:pointer;font-size:11px;display:none;align-items:center;justify-content:center;flex-shrink:0}.chat-item:hover .chat-del{display:flex}.chat-del:hover{background:var(--error);color:#fff}.chat-rename{width:20px;height:20px;border:none;border-radius:4px;background:0 0;color:var(--text-tertiary);cursor:pointer;font-size:12px;display:none;align-items:center;justify-content:center;flex-shrink:0}.chat-item:hover .chat-rename{display:flex}.chat-rename:hover{background:var(--accent);color:#fff}.chat-rename-input{width:100%;border:1px solid var(--accent);border-radius:4px;background:var(--bg-primary);color:var(--text-primary);font-size:13px;padding:2px 6px;outline:0;font-family:var(--font)}.tree-category{margin-bottom:4px}.tree-category-header{display:flex;align-items:center;gap:6px;padding:8px 16px;cursor:pointer;user-select:none;font-size:13px;font-weight:500;color:var(--text-secondary);transition:.15s}.tree-category-header:hover{background:var(--bg-hover);color:var(--text-primary)}.tree-arrow{font-size:10px;transition:transform .2s;color:var(--text-tertiary)}.tree-category.collapsed .tree-arrow{transform:rotate(-90deg)}.tree-category-count{margin-left:auto;font-size:11px;color:var(--text-tertiary);background:var(--bg-tertiary);padding:1px 8px;border-radius:10px}.tree-children{overflow:hidden}.tree-category.collapsed .tree-children{display:none}.tree-article{padding:7px 16px 7px 36px;cursor:pointer;font-size:13px;color:var(--text-secondary);transition:.15s;line-height:1.4}.tree-article:hover{background:var(--bg-hover);color:var(--text-primary)}.tree-article.active{background:var(--accent-light);color:var(--accent);font-weight:500}.doc-empty,.loading{padding:20px;text-align:center;color:var(--text-tertiary);font-size:13px}.chat-area{flex:1;display:flex;flex-direction:column;background:var(--bg-secondary);min-width:0}.chat-messages{flex:1;overflow-y:auto;padding:24px 0}.welcome{max-width:720px;margin:60px auto;text-align:center;padding:0 24px}.welcome-icon{width:64px;height:64px;margin:0 auto 16px;border-radius:12px;overflow:hidden;background:var(--accent-gradient);display:flex;align-items:center;justify-content:center;font-size:32px;font-weight:700;color:#fff;box-shadow:var(--shadow-lg)}.welcome h2{font-size:24px;color:var(--text-primary);margin-bottom:8px;font-weight:600}.welcome p{color:var(--text-secondary);margin-bottom:28px;font-size:14px}.suggestions{display:grid;grid-template-columns:1fr 1fr;gap:12px;max-width:600px;margin:0 auto}.suggestion-card{padding:14px 18px;border:1px solid var(--border-color);border-radius:var(--radius);background:var(--bg-primary);text-align:left;cursor:pointer;font-size:13px;color:var(--text-secondary);transition:.2s;font-family:var(--font)}.suggestion-card:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-light);transform:translateY(-2px);box-shadow:var(--shadow-md)}.message{max-width:820px;margin:0 auto;padding:12px 24px;display:flex;gap:14px}.message-avatar{width:36px;height:36px;border-radius:var(--radius-sm);flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:18px;box-shadow:var(--shadow-sm);overflow:hidden}.login-icon img,.logo img,.message-avatar img,.welcome-icon img{width:100%;height:100%;border-radius:inherit;object-fit:cover}.message.user .message-avatar{background:var(--accent-gradient);color:#fff}.message.assistant .message-avatar{background:linear-gradient(135deg,#a8edea 0,#84fab0 100%);color:#1a3a2a}.message-body{flex:1;min-width:0}.message-role{font-size:12px;color:var(--text-tertiary);margin-bottom:4px;font-weight:500}.message-content{color:var(--text-primary);font-size:14px;word-wrap:break-word;line-height:1.7;background:var(--bg-primary);padding:12px 16px;border-radius:var(--radius);box-shadow:var(--shadow-sm);display:inline-block;max-width:100%}.message.user .message-content{background:var(--accent-light)}.message-content p{margin-bottom:8px}.message-content p:last-child{margin-bottom:0}.message-content h1,.message-content h2,.message-content h3{margin:14px 0 8px;font-weight:600;line-height:1.4}.message-content h1{font-size:18px}.message-content h2{font-size:16px}.message-content h3{font-size:15px}.message-content ol,.message-content ul{margin:8px 0;padding-left:24px}.message-content li{margin-bottom:4px}.message-content code{background:var(--bg-tertiary);padding:2px 6px;border-radius:4px;font-family:var(--font-mono);font-size:13px;color:var(--accent)}.message-content pre{background:#1e1e2e;padding:14px 16px;border-radius:var(--radius);overflow-x:auto;margin:10px 0;border:1px solid var(--border-color)}.message-content pre code{background:0 0;padding:0;font-size:13px;line-height:1.6;color:#cdd6f4}.message-content blockquote{border-left:3px solid var(--accent);padding:4px 12px;margin:8px 0;color:var(--text-secondary);background:var(--bg-secondary);border-radius:0 var(--radius-sm) var(--radius-sm) 0}.message-content table{border-collapse:collapse;margin:8px 0;width:100%}.message-content td,.message-content th{border:1px solid var(--border-color);padding:6px 12px;text-align:left}.message-content th{background:var(--bg-tertiary);font-weight:600}.message-content hr{border:none;border-top:1px solid var(--border-color);margin:12px 0}.message-actions{display:flex;gap:4px;margin-top:6px;opacity:0;transition:opacity .2s}.message:hover .message-actions{opacity:1}.copy-btn{padding:3px 10px;border:none;border-radius:6px;background:var(--bg-tertiary);color:var(--text-tertiary);cursor:pointer;font-size:12px;display:flex;align-items:center;gap:4px;transition:.15s;font-family:var(--font)}.copy-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.copy-btn.copied{background:var(--success);color:#fff}.edit-btn{padding:3px 10px;border:none;border-radius:6px;background:var(--bg-tertiary);color:var(--text-tertiary);cursor:pointer;font-size:12px;display:flex;align-items:center;gap:4px;transition:.15s;font-family:var(--font)}.edit-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.edit-input{width:100%;border:1px solid var(--accent);border-radius:6px;resize:none;background:var(--bg-primary);color:var(--text-primary);font-family:var(--font);font-size:14px;line-height:1.5;padding:6px 10px;min-height:36px;max-height:120px;outline:0;box-shadow:0 0 0 3px var(--accent-light)}.references{margin-top:10px;padding:10px 14px;background:var(--accent-light);border-radius:var(--radius-sm);border-left:3px solid var(--accent)}.references-title{font-size:12px;color:var(--text-secondary);margin-bottom:6px;font-weight:500}.reference-item{display:flex;align-items:center;gap:6px;padding:4px 0;font-size:13px;color:var(--accent);cursor:pointer;transition:opacity .15s}.reference-item:hover{opacity:.8;text-decoration:underline}.typing-cursor{display:inline-block;width:8px;height:16px;background:var(--accent);animation:1s infinite blink;vertical-align:middle}@keyframes blink{0%,50%{opacity:1}100%,51%{opacity:0}}.chat-input-area{padding:12px 24px 16px;background:var(--bg-secondary);border-top:1px solid var(--border-color)}.chat-input-wrap{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:10px;background:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:14px 16px;box-shadow:var(--shadow-md);transition:.2s}.chat-input-wrap:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light)}.chat-input{width:100%;border:none;outline:0;resize:none;background:0 0;color:var(--text-primary);font-family:var(--font);font-size:14px;line-height:1.6;min-height:44px;max-height:280px;padding:0}.chat-input-bar{display:flex;align-items:center;justify-content:flex-end;gap:8px}.send-btn{padding:7px 16px;border:none;border-radius:var(--radius);background:var(--accent-gradient);color:#fff;cursor:pointer;font-size:13px;font-weight:500;transition:.2s;white-space:nowrap;box-shadow:var(--shadow-sm);min-width:64px;display:inline-flex;align-items:center;justify-content:center;gap:4px}.send-btn:hover:not(:disabled){transform:translateY(-1px);box-shadow:var(--shadow-lg)}.send-btn:disabled{background:var(--accent-gradient);opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}.model-dropdown{position:relative}.model-select{display:inline-flex;align-items:center;gap:4px;border:1px solid var(--border-color);border-radius:6px;background:var(--bg-primary);color:var(--text-secondary);font-family:var(--font);font-size:12px;padding:5px 10px;cursor:pointer;outline:0;transition:.15s;max-width:50vw}.model-select:hover{border-color:var(--accent);background:var(--accent-light);color:var(--accent)}.model-select:focus{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-light)}.model-select-label{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:120px}.model-select-arrow{transition:transform .2s;flex-shrink:0;opacity:.6}.model-dropdown.open .model-select-arrow{transform:rotate(180deg)}.model-menu{position:absolute;bottom:calc(100% + 4px);right:0;min-width:160px;max-width:260px;background:var(--bg-primary);border:1px solid var(--border-color);border-radius:8px;box-shadow:var(--shadow-lg);padding:4px;list-style:none;margin:0;display:none;z-index:100;max-height:280px;overflow-y:auto}.model-menu.show{display:block}.model-menu li{padding:7px 10px;border-radius:4px;cursor:pointer;font-size:12px;color:var(--text-secondary);transition:.12s;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.model-menu li:hover{background:var(--bg-hover);color:var(--text-primary)}.model-menu li.active{background:var(--accent-light);color:var(--accent);font-weight:500}.chat-input-hint{max-width:820px;margin:6px auto 0;font-size:11px;color:var(--text-tertiary);text-align:center}.doc-panel{width:420px;background:var(--bg-primary);border-left:1px solid var(--border-color);display:none;flex-direction:column;flex-shrink:0}.doc-panel.open{display:flex}.doc-header{display:flex;justify-content:space-between;align-items:center;padding:14px 16px;border-bottom:1px solid var(--border-color)}.doc-header h3{font-size:14px;font-weight:600;color:var(--text-primary)}.doc-title-link{color:var(--accent);text-decoration:none;display:inline-flex;align-items:center;gap:4px;transition:color .15s}.doc-title-link:hover{color:var(--accent-hover);text-decoration:underline}.doc-title-link::after{content:'↗';font-size:12px;opacity:.7}.doc-content{flex:1;overflow-y:auto;padding:16px}.doc-content h1,.doc-content h2,.doc-content h3{margin:16px 0 8px;font-weight:600;color:var(--text-primary)}.doc-content p{margin-bottom:10px;color:var(--text-primary)}.doc-content code{background:var(--bg-tertiary);padding:2px 6px;border-radius:4px;font-family:var(--font-mono);font-size:13px}.doc-content pre{background:#1e1e2e;padding:14px;border-radius:var(--radius);overflow-x:auto;margin:10px 0}.doc-content pre code{background:0 0;padding:0;color:#cdd6f4}.doc-content ol,.doc-content ul{margin:10px 0;padding-left:24px}.doc-content img{max-width:100%;border-radius:var(--radius-sm)}.login-page{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,#e0e7ff 0,#f3e8ff 50%,#fce7f3 100%);position:relative;overflow:hidden}.login-page::before{content:'';position:absolute;top:-30%;left:-30%;width:160%;height:160%;background:radial-gradient(circle at 20% 30%,rgba(102,126,234,.15) 0,transparent 40%),radial-gradient(circle at 80% 70%,rgba(168,237,234,.15) 0,transparent 40%);animation:20s ease-in-out infinite float}@keyframes float{0%,100%{transform:translate(0,0)}50%{transform:translate(-30px,20px)}}.login-container{width:100%;max-width:460px;padding:24px;position:relative;z-index:1}.login-card{width:420px;max-width:90vw;background:rgba(255,255,255,.85);backdrop-filter:blur(20px);border-radius:24px;padding:48px 40px;box-shadow:0 20px 60px rgba(102,126,234,.15),0 0 0 1px rgba(255,255,255,.6)}.login-header{text-align:center;margin-bottom:32px}.login-icon{width:64px;height:64px;margin:0 auto 20px;border-radius:12px;overflow:hidden;box-shadow:0 8px 24px rgba(102,126,234,.25)}.login-header h1{font-size:20px;color:#1a1a2e;margin-bottom:4px;font-weight:600}.login-header p{font-size:14px;color:#6b7280}.login-form{display:flex;flex-direction:column;gap:16px}.form-group{width:100%}.input-wrap{position:relative;display:flex;align-items:center;background:rgba(255,255,255,.7);border:1px solid rgba(102,126,234,.15);border-radius:12px;transition:.2s}.input-wrap:focus-within{border-color:#667eea;box-shadow:0 0 0 4px rgba(102,126,234,.1);background:#fff}.input-icon{position:absolute;left:14px;color:#9ca3af;pointer-events:none}.form-input{width:100%;padding:14px 16px 14px 44px;border:none;outline:0;background:0 0;color:#1a1a2e;font-size:14px;font-family:var(--font);border-radius:12px}.form-input::placeholder{color:#9ca3af}.login-error{padding:10px 14px;background:rgba(239,68,68,.1);color:#ef4444;border-radius:8px;font-size:13px;text-align:center}.login-btn{padding:14px;border:none;border-radius:12px;background:linear-gradient(135deg,#667eea 0,#4e7bef 100%);color:#fff;cursor:pointer;font-size:15px;font-weight:600;transition:.2s;margin-top:8px;box-shadow:0 4px 16px rgba(102,126,234,.35)}.login-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 24px rgba(102,126,234,.45)}.login-btn:disabled{opacity:.6;cursor:not-allowed}[data-theme=dark] .login-page{background:linear-gradient(135deg,#1a1a2e 0,#16213e 50%,#1a1a2e 100%)}[data-theme=dark] .login-card{background:rgba(30,30,30,.85)}[data-theme=dark] .login-header h1{color:var(--text-primary)}[data-theme=dark] .login-header p{color:var(--text-secondary)}[data-theme=dark] .input-wrap{background:var(--bg-secondary);border-color:var(--border-color)}[data-theme=dark] .form-input{color:var(--text-primary)}[data-theme=dark] .input-icon{color:var(--text-tertiary)}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--bg-active);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}@media (max-width:768px){.menu-toggle{display:flex}.header{padding:0 12px}.title{font-size:14px}.blog-link span{display:none}.blog-link{padding:6px 8px}.status-badge{display:none}.sidebar{position:fixed;left:0;top:56px;bottom:0;width:280px;max-width:85vw;transform:translateX(-100%);transition:transform .3s;z-index:50;box-shadow:var(--shadow-lg)}.sidebar.open{transform:translateX(0)}.sidebar-mask{position:fixed;left:0;top:56px;right:0;bottom:0;background:rgba(0,0,0,.4);z-index:40;display:none}.sidebar-mask.show{display:block}.doc-panel{width:100%;position:absolute;right:0;top:0;bottom:0;z-index:60}.suggestions{grid-template-columns:1fr}.welcome{margin:40px auto;padding:0 16px}.welcome h2{font-size:20px}.message{padding:10px 12px}.chat-input-area{padding:10px 12px 12px}.chat-input-wrap{padding:10px 12px;gap:8px}.login-card{width:100%;padding:32px 24px;border-radius:20px}.login-header h1{font-size:18px}.login-header p{font-size:13px}}.modal-mask{position:fixed;inset:0;background:rgba(0,0,0,.4);display:flex;align-items:center;justify-content:center;z-index:1000;opacity:0;visibility:hidden;transition:opacity .2s,visibility .2s}.modal-mask.show{opacity:1;visibility:visible}.modal-card{background:var(--bg-primary);border-radius:16px;padding:32px 28px 24px;width:320px;max-width:90vw;text-align:center;box-shadow:0 20px 60px rgba(0,0,0,.2);transform:scale(.9);transition:transform .2s}.modal-mask.show .modal-card{transform:scale(1)}.modal-icon{display:flex;align-items:center;justify-content:center;margin-bottom:14px}.modal-title{font-size:17px;font-weight:600;color:var(--text-primary);margin-bottom:6px}.modal-desc{font-size:13px;color:var(--text-secondary);margin-bottom:22px;line-height:1.5}.modal-actions{display:flex;gap:10px}.modal-btn{flex:1;padding:10px;border:none;border-radius:10px;cursor:pointer;font-size:14px;font-weight:500;font-family:var(--font);transition:.15s}.modal-cancel{background:var(--bg-tertiary);color:var(--text-secondary)}.modal-cancel:hover{background:var(--bg-hover);color:var(--text-primary)}.modal-confirm{background:var(--error);color:#fff}.modal-confirm:hover{background:#d93636}