@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap");:root{--bg-primary:#faf9f6;--bg-secondary:#fff;--bg-hover:#f5f0e8;--bg-accent:#f0ebe3;--text-primary:#1a1a1a;--text-secondary:#6b6b5e;--text-tertiary:#9b9b8f;--border:#e5e0d8;--border-light:#edebe7;--accent:#c45d3e;--accent-hover:#a84b30;--accent-light:#f5e6e0;--accent-bg:#fdf5f2;--success:#3d7c47;--success-bg:#edf5ee;--warning:#b8860b;--warning-bg:#fdf6e3;--error:#c43e3e;--error-bg:#fdf2f2;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--sidebar-width:280px;--header-height:52px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg-primary);color:var(--text-primary);line-height:1.5;-webkit-font-smoothing:antialiased;overflow:hidden}.app{display:flex;flex-direction:column;height:100vh}header{height:var(--header-height);background:var(--bg-secondary);border-bottom:1px solid var(--border);padding:0 20px;justify-content:space-between;flex-shrink:0}.header-left,header{display:flex;align-items:center}.header-left{gap:12px}.menu-btn{background:none;border:none;color:var(--text-secondary);cursor:pointer;padding:6px;border-radius:var(--radius-sm);display:flex;align-items:center}.menu-btn:hover{background:var(--bg-hover)}.logo{gap:10px}.logo,.logo-icon{display:flex;align-items:center}.logo-icon{width:26px;height:26px;background:var(--accent);border-radius:var(--radius-sm);justify-content:center;color:#fff;font-weight:700;font-size:13px}header h1{font-size:15px;font-weight:600;color:var(--text-primary);letter-spacing:-.3px}.header-right{gap:12px}.header-center,.header-right{display:flex;align-items:center}.header-center{gap:2px}.header-tab{display:flex;align-items:center;gap:6px;padding:6px 14px;border:none;background:none;font-size:13px;font-weight:500;color:var(--text-tertiary);border-radius:var(--radius-sm);cursor:pointer;font-family:inherit;transition:all .15s}.header-tab:hover{color:var(--text-secondary);background:var(--bg-hover)}.header-tab.active{color:var(--accent);background:var(--accent-light)}.lang-switcher{display:flex;align-items:center;gap:2px;background:var(--bg-accent);border-radius:var(--radius-sm);padding:3px}.lang-icon{margin:0 4px}.lang-btn,.lang-icon{color:var(--text-tertiary)}.lang-btn{border:none;background:none;font-size:11px;font-weight:600;padding:3px 8px;border-radius:6px;cursor:pointer;transition:all .15s}.lang-btn:hover{color:var(--text-secondary)}.lang-btn.active{background:var(--bg-secondary);color:var(--accent);box-shadow:0 1px 2px rgba(0,0,0,.06)}.main-layout{display:flex;flex:1 1;overflow:hidden}.main-layout.full{overflow-y:auto;display:block}.doc-sidebar{width:var(--sidebar-width);background:var(--bg-secondary);border-right:1px solid var(--border);display:flex;flex-direction:column;flex-shrink:0;overflow:hidden}.sidebar-top{flex:1 1;display:flex;flex-direction:column;overflow-y:auto}.sidebar-divider{height:1px;background:var(--border);margin:0 12px}.sidebar-bottom{flex:1 1;display:flex;flex-direction:column;overflow:hidden}.conv-new-btn{display:flex;align-items:center;gap:6px;margin:12px;padding:8px 12px;background:var(--accent);color:#fff;border:none;border-radius:var(--radius-md);cursor:pointer;font-size:13px;font-weight:500}.conv-new-btn:hover{opacity:.9}.conv-list{flex:1 1;overflow-y:auto;padding:0 8px}.conv-item{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:var(--radius-sm);cursor:pointer;font-size:13px;color:var(--text-secondary);transition:background .15s}.conv-item:hover{background:var(--bg-hover)}.conv-item.active{background:var(--bg-accent);color:var(--text-primary)}.conv-title{flex:1 1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.conv-delete{opacity:0;background:none;border:none;cursor:pointer;color:var(--text-tertiary);padding:2px}.conv-item:hover .conv-delete{opacity:1}.conv-delete:hover{color:var(--error)}.sidebar-header{padding:16px 16px 12px;display:flex;justify-content:space-between;align-items:center}.sidebar-header h2{font-size:13px;text-transform:uppercase;letter-spacing:.5px}.doc-count,.sidebar-header h2{font-weight:600;color:var(--text-tertiary)}.doc-count{font-size:11px;background:var(--bg-accent);padding:1px 7px;border-radius:10px}.sidebar-upload{position:relative;margin:0 12px 12px;padding:12px;border:1.5px dashed var(--border);border-radius:var(--radius-md);cursor:pointer;transition:all .2s}.sidebar-upload.dragging,.sidebar-upload:hover{border-color:var(--accent);background:var(--accent-bg)}.sidebar-upload.dragging{box-shadow:0 0 0 3px var(--accent-light)}.sidebar-upload input{position:absolute;top:0;left:0;width:100%;height:100%;opacity:0;cursor:pointer;z-index:1}.sidebar-upload-btn{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:500;color:var(--text-secondary)}.sidebar-formats{font-size:11px;color:var(--text-tertiary);margin-top:6px}.sidebar-docs{flex:1 1;overflow-y:auto;padding:0 12px 12px;display:flex;flex-direction:column;gap:4px}.sidebar-empty{text-align:center;padding:32px 16px;font-size:13px;color:var(--text-tertiary);line-height:1.6}.sidebar-doc-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--radius-sm);transition:background .15s}.sidebar-doc-item:hover{background:var(--bg-hover)}.sidebar-doc-item .doc-icon{color:var(--accent);flex-shrink:0}.sidebar-doc-item .doc-info{flex:1 1;min-width:0}.sidebar-doc-item .doc-name{font-size:13px;font-weight:500;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:block}.sidebar-doc-item .doc-meta{font-size:11px;color:var(--text-tertiary);display:flex;align-items:center;gap:6px;margin-top:2px}.status-dot{width:6px;height:6px;border-radius:50%;display:inline-block}.status-dot.indexed{background:var(--success)}.status-dot.indexing,.status-dot.parsing{background:var(--warning)}.status-dot.uploaded{background:var(--text-tertiary)}.status-dot.failed{background:var(--error)}.doc-delete{background:none;border:none;color:var(--text-tertiary);cursor:pointer;padding:4px;border-radius:4px;display:flex;opacity:0;transition:all .15s}.sidebar-doc-item:hover .doc-delete{opacity:1}.doc-delete:hover{background:var(--error-bg);color:var(--error)}.chat-area{flex:1 1;overflow:hidden;min-width:0}.chat-area,.chat-container{display:flex;flex-direction:column}.chat-container{height:100%}.chat-main{flex:1 1;display:flex;flex-direction:column;min-width:0;overflow:hidden}.chat-messages{flex:1 1;min-height:0;overflow-y:auto;padding:24px 0}.chat-messages::-webkit-scrollbar{width:5px}.chat-messages::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}.chat-welcome{flex-direction:column;height:100%;text-align:center;padding:20px}.chat-welcome,.welcome-icon{display:flex;align-items:center;justify-content:center}.welcome-icon{width:56px;height:56px;background:var(--accent-light);border-radius:50%;color:var(--accent);margin-bottom:20px}.chat-welcome h2{font-size:22px;font-weight:600;color:var(--text-primary);margin-bottom:8px;letter-spacing:-.3px}.chat-welcome p{font-size:14px;color:var(--text-tertiary);max-width:380px;line-height:1.6}.suggestions{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:28px;max-width:500px}.suggestion{display:inline-flex;align-items:center;gap:6px;font-size:13px;padding:10px 16px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:20px;cursor:pointer;color:var(--text-secondary);transition:all .2s;font-family:inherit}.suggestion:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-bg);transform:translateY(-1px)}.message{display:flex;gap:12px;padding:4px 32px}.message.user{flex-direction:row-reverse}.message-avatar{flex-shrink:0;padding-top:2px}.avatar-user{background:var(--accent);color:#fff;font-size:12px;font-weight:600}.avatar-ai,.avatar-user{width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center}.avatar-ai{background:var(--accent-light);color:var(--accent)}.message-body{max-width:680px;min-width:0}.message-bubble{padding:12px 16px;border-radius:var(--radius-lg);font-size:14px;line-height:1.7}.message-content h1,.message-content h2,.message-content h3{margin:12px 0 6px;font-weight:600}.message-content h1{font-size:16px}.message-content h2{font-size:15px}.message-content h3{font-size:14px}.message-content ol,.message-content ul{margin:6px 0;padding-left:20px}.message-content li{margin:2px 0}.message-content p{margin:4px 0}.message-content strong{font-weight:600}.message-content code{background:var(--bg-accent);padding:1px 5px;border-radius:4px;font-size:13px}.message-content pre{background:var(--bg-accent);padding:10px 12px;border-radius:var(--radius-sm);overflow-x:auto;margin:8px 0}.message-content pre code{background:none;padding:0}.message.user .message-bubble{background:var(--accent);color:#fff;border-bottom-right-radius:4px}.message.assistant .message-bubble{background:var(--bg-secondary);border:1px solid var(--border-light);border-bottom-left-radius:4px}.message-sources{margin-top:10px;padding:10px 12px;background:var(--bg-secondary);border:1px solid var(--border-light);border-radius:var(--radius-md)}.sources-header{display:flex;align-items:center;gap:6px;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.5px;color:var(--text-tertiary);margin-bottom:8px}.sources-list{display:flex;flex-wrap:wrap;gap:6px}.source-chip{display:inline-flex;align-items:center;gap:6px;background:var(--bg-accent);padding:5px 10px;border-radius:20px;font-size:11px;color:var(--text-secondary);font-weight:500}.source-score{color:var(--success);font-weight:600}.typing{padding:14px 20px!important}.typing-dots{display:flex;gap:5px}.typing-dots span{width:7px;height:7px;background:var(--text-tertiary);border-radius:50%;animation:dotBounce 1.4s ease-in-out infinite}.typing-dots span:nth-child(2){animation-delay:.2s}.typing-dots span:nth-child(3){animation-delay:.4s}@keyframes dotBounce{0%,80%,to{transform:translateY(0);opacity:.3}40%{transform:translateY(-8px);opacity:1}}.chat-input-wrapper{padding:0 32px 20px}.chat-input-box{display:flex;align-items:flex-end;background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-lg);padding:5px 5px 5px 16px;transition:all .2s;box-shadow:0 2px 8px rgba(0,0,0,.04)}.chat-input-box:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light),0 2px 8px rgba(0,0,0,.04)}.chat-input-box textarea{flex:1 1;border:none;outline:none;font-size:14px;font-family:inherit;resize:none;padding:10px 0;background:transparent;color:var(--text-primary);line-height:1.5;max-height:120px}.chat-input-box textarea::placeholder{color:var(--text-tertiary)}.send-btn{width:34px;height:34px;background:var(--accent);color:#fff;border:none;border-radius:var(--radius-sm);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s;flex-shrink:0}.send-btn:hover{background:var(--accent-hover);transform:scale(1.05)}.send-btn:disabled{background:var(--border);cursor:not-allowed;transform:none}.chat-hint{text-align:center;font-size:11px;color:var(--text-tertiary);margin-top:8px;opacity:.7}.spin{animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.settings-btn{background:none;border:none;color:var(--text-tertiary);cursor:pointer;padding:6px;border-radius:var(--radius-sm);display:flex;align-items:center;transition:all .15s}.settings-btn:hover{background:var(--bg-hover);color:var(--accent)}.settings-overlay{position:fixed;inset:0;background:rgba(0,0,0,.3);z-index:100;display:flex;justify-content:flex-end;animation:fadeIn .2s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.settings-panel{width:420px;max-width:100%;height:100%;background:var(--bg-secondary);display:flex;flex-direction:column;animation:slideIn .25s ease}@keyframes slideIn{0%{transform:translateX(100%)}to{transform:translateX(0)}}.settings-header{padding:20px 24px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:flex-start}.settings-header h2{font-size:17px;font-weight:600;color:var(--text-primary);margin-bottom:4px}.settings-header p{font-size:13px;color:var(--text-tertiary);line-height:1.5}.settings-close{background:none;border:none;color:var(--text-tertiary);cursor:pointer;padding:4px;border-radius:var(--radius-sm);display:flex}.settings-close:hover{background:var(--bg-hover);color:var(--text-primary)}.settings-body{flex:1 1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:24px}.settings-section h3{font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:.5px;color:var(--text-tertiary);margin-bottom:14px}.settings-field{margin-bottom:14px}.settings-field label{display:block;font-size:13px;font-weight:500;color:var(--text-secondary);margin-bottom:6px}.settings-field input{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:13px;font-family:inherit;color:var(--text-primary);background:var(--bg-primary);outline:none;transition:border-color .15s}.settings-field input:focus{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-light)}.settings-field .settings-hint{font-size:11px;color:var(--text-tertiary);margin-top:4px;display:block}.settings-section-desc{font-size:12px;color:var(--text-tertiary);margin-bottom:14px;line-height:1.5}.settings-select{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:13px;font-family:inherit;color:var(--text-primary);background:var(--bg-primary);outline:none;cursor:pointer}.settings-select:focus{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-light)}.input-with-btn{display:flex;gap:0}.input-with-btn input{flex:1 1;border-top-right-radius:0;border-bottom-right-radius:0}.input-toggle{background:var(--bg-primary);border:1px solid var(--border);border-left:none;border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:0 12px;cursor:pointer;font-size:14px}.settings-hint{font-size:12px;color:var(--text-tertiary);padding:10px 14px;background:var(--bg-accent);border-radius:var(--radius-sm);line-height:1.5}.settings-footer{padding:16px 24px;border-top:1px solid var(--border);display:flex;justify-content:space-between;align-items:center}.settings-reset{padding:8px 16px;background:none;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:13px;font-weight:500;color:var(--text-secondary);cursor:pointer;font-family:inherit}.settings-reset:hover{background:var(--bg-hover)}.settings-save{padding:8px 20px;background:var(--accent);color:#fff;border:none;border-radius:var(--radius-sm);font-size:13px;font-weight:600;cursor:pointer;display:flex;align-items:center;gap:6px;font-family:inherit;transition:all .15s}.settings-save:hover{background:var(--accent-hover)}.settings-save:disabled{opacity:.6;cursor:not-allowed}.settings-save.saved{background:var(--success)}.settings-actions{display:flex;align-items:center;gap:10px;margin-top:4px}.test-btn{display:inline-flex;align-items:center;gap:5px;padding:5px 12px;background:var(--bg-accent);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:12px;font-weight:500;color:var(--text-secondary);cursor:pointer;font-family:inherit;transition:all .15s}.test-btn:hover{background:var(--accent-light);color:var(--accent);border-color:var(--accent)}.test-btn:disabled{opacity:.5;cursor:not-allowed}.test-result{display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:500;padding:4px 10px;border-radius:var(--radius-sm)}.test-result.pass{background:var(--success-bg);color:var(--success)}.test-result.fail{background:var(--error-bg);color:var(--error)}.mech-page{max-width:860px;margin:0 auto;padding:40px 32px}.mech-hero{text-align:center;margin-bottom:48px}.mech-hero h1{font-size:28px;font-weight:700;color:var(--text-primary);letter-spacing:-.5px;margin-bottom:8px}.mech-hero p{font-size:15px;color:var(--text-tertiary);max-width:520px;margin:0 auto;line-height:1.6}.mech-flow{margin-bottom:32px}.mech-flow-header{margin-bottom:24px}.mech-flow-badge{display:inline-block;font-size:11px;font-weight:600;padding:3px 10px;border-radius:20px;margin-bottom:10px;letter-spacing:.3px}.mech-flow-header h3{font-size:20px;font-weight:600;color:var(--text-primary);margin-bottom:6px;letter-spacing:-.3px}.mech-flow-header p{font-size:14px;color:var(--text-tertiary);line-height:1.5}.mech-flow-steps{display:flex;flex-direction:column;gap:16px;padding-left:20px}.mech-flow-step-wrapper{display:flex;align-items:flex-start;gap:16px;position:relative}.mech-flow-step-wrapper:not(:last-child):before{content:"";position:absolute;left:14px;top:36px;bottom:-16px;width:2px;background:var(--border)}.mech-step-num{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:12px;font-weight:700;flex-shrink:0}.mech-step{display:flex;gap:14px;align-items:flex-start}.mech-step-icon{width:40px;height:40px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;flex-shrink:0}.mech-step-content h4{font-size:15px;font-weight:600;color:var(--text-primary);margin-bottom:4px}.mech-step-content p{font-size:13px;color:var(--text-tertiary);line-height:1.5;max-width:480px}.mech-connector{display:flex;align-items:center;gap:12px;padding:8px 20px;margin:16px 0}.mech-connector-line{flex:1 1;height:2px;background:var(--border)}.mech-connector-arrow{color:var(--text-tertiary)}.mech-tech{margin-top:48px;padding:24px;background:var(--bg-secondary);border:1px solid var(--border-light);border-radius:var(--radius-lg)}.mech-tech h3{font-size:16px;font-weight:600;color:var(--text-primary);margin-bottom:16px}.mech-tech-list{display:grid;grid-template-columns:1fr 1fr;grid-gap:12px;gap:12px}.mech-tech-item{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--text-secondary);padding:8px 12px;background:var(--bg-primary);border-radius:var(--radius-sm)}.mech-tech-icon{width:28px;height:28px;background:var(--accent-light);color:var(--accent);border-radius:6px;display:flex;align-items:center;justify-content:center;flex-shrink:0}