:root{--plat-bg:#f9fafb;--plat-surface:#fff;--plat-surface-hover:#f3f4f6;--plat-border:#e5e7eb;--plat-border-focus:#d1d5db;--plat-text-main:#111827;--plat-text-sec:#4b5563;--plat-text-muted:#9ca3af;--plat-primary:#e10600;--plat-primary-hover:#ff2a1a;--plat-primary-light:#e1060014;--plat-gold:#ffb347;--font-body:"Inter", system-ui, sans-serif;--font-display:"Outfit", sans-serif;--font-mono:"JetBrains Mono", monospace;--sidebar-width:260px;--header-height:64px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-body);background-color:var(--plat-bg);color:var(--plat-text-main);height:100vh;display:flex;overflow:hidden}.plat-sidebar{width:var(--sidebar-width);background:var(--plat-surface);border-right:1px solid var(--plat-border);flex-direction:column;flex-shrink:0;height:100%;display:flex}.sidebar-header{height:var(--header-height);border-bottom:1px solid var(--plat-border);align-items:center;padding:0 1.5rem;display:flex}.sidebar-logo{font-family:var(--font-display);letter-spacing:-.02em;align-items:center;gap:.5rem;font-size:1.25rem;font-weight:800;display:flex}.sidebar-logo svg{color:var(--plat-primary);width:20px;height:20px}.sidebar-nav{flex-grow:1;padding:1.5rem 1rem;overflow-y:auto}.nav-group{margin-bottom:2rem}.nav-group-title{color:var(--plat-text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:.5rem;padding:0 .5rem;font-size:.7rem;font-weight:600}.nav-item{color:var(--plat-text-sec);cursor:pointer;border-radius:6px;align-items:center;gap:.75rem;padding:.5rem;font-size:.85rem;font-weight:500;text-decoration:none;transition:all .2s;display:flex}.nav-item:hover{background:var(--plat-surface-hover);color:var(--plat-text-main)}.nav-item.active{background:var(--plat-primary-light);color:var(--plat-primary)}.nav-item.active svg{stroke:var(--plat-primary)}.nav-item svg{width:18px;height:18px;stroke:var(--plat-text-muted);fill:none;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round;transition:stroke .2s}.plat-main{flex-direction:column;flex-grow:1;height:100%;display:flex}.plat-header{height:var(--header-height);background:var(--plat-surface);border-bottom:1px solid var(--plat-border);flex-shrink:0;justify-content:space-between;align-items:center;padding:0 2rem;display:flex}.header-breadcrumbs{color:var(--plat-text-sec);align-items:center;gap:.5rem;font-size:.85rem;display:flex}.breadcrumb-separator{color:var(--plat-text-muted)}.breadcrumb-current{color:var(--plat-text-main);font-weight:600}.header-actions{align-items:center;gap:1rem;display:flex}.btn-primary{background:var(--plat-primary);color:#fff;cursor:pointer;border:none;border-radius:6px;padding:.5rem 1rem;font-size:.8rem;font-weight:600;transition:background .2s}.btn-primary:hover{background:var(--plat-primary-hover)}.workspace{height:calc(100vh - var(--header-height));flex-grow:1;display:flex;overflow:hidden}.pane-chat{background:var(--plat-bg);border-right:1px solid var(--plat-border);flex-direction:column;width:45%;display:flex}.chat-history{flex-direction:column;flex-grow:1;gap:1.5rem;padding:2rem;display:flex;overflow-y:auto}.chat-msg{gap:1rem;max-width:90%;display:flex}.msg-ai{align-self:flex-start}.msg-user{flex-direction:row-reverse;align-self:flex-end}.msg-avatar{border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;display:flex}.msg-ai .msg-avatar{background:var(--plat-surface);border:1px solid var(--plat-border)}.msg-ai .msg-avatar svg{width:18px;height:18px;stroke:var(--plat-primary)}.msg-user .msg-avatar{background:var(--plat-primary-light);color:var(--plat-primary);font-size:.8rem;font-weight:600}.msg-bubble{border-radius:12px;padding:1rem;font-size:.9rem;line-height:1.5}.msg-ai .msg-bubble{background:var(--plat-surface);border:1px solid var(--plat-border);border-top-left-radius:2px;box-shadow:0 2px 10px #00000005}.msg-user .msg-bubble{background:var(--plat-primary-light);color:var(--plat-primary);border-top-right-radius:2px}.msg-choices{flex-direction:column;gap:.5rem;margin-top:1rem;display:flex}.choice-chip{background:var(--plat-bg);border:1px solid var(--plat-border);color:var(--plat-text-sec);cursor:pointer;text-align:left;border-radius:8px;justify-content:space-between;align-items:center;padding:.75rem 1rem;font-size:.85rem;transition:all .2s;display:flex}.choice-chip:hover{border-color:var(--plat-primary);background:var(--plat-primary-light);color:var(--plat-primary)}.choice-chip svg{opacity:0;width:16px;height:16px;transition:opacity .2s}.choice-chip:hover svg{opacity:1}.chat-input-area{background:var(--plat-surface);border-top:1px solid var(--plat-border);padding:1.5rem 2rem}.input-wrapper{align-items:center;display:flex;position:relative}.chat-input{border:1px solid var(--plat-border);width:100%;font-family:var(--font-body);resize:none;background:var(--plat-bg);color:var(--plat-text-main);border-radius:8px;padding:1rem 3rem 1rem 1rem;font-size:.9rem;transition:border-color .2s}.chat-input:focus{border-color:var(--plat-primary);box-shadow:0 0 0 3px var(--plat-primary-light);outline:none}.input-submit{background:var(--plat-primary);cursor:pointer;border:none;border-radius:6px;justify-content:center;align-items:center;width:32px;height:32px;transition:all .2s;display:flex;position:absolute;right:.75rem}.input-submit:hover{background:var(--plat-primary-hover)}.input-submit svg{stroke:#fff;fill:none;width:16px;height:16px}.pane-doc{background:var(--plat-surface);flex-direction:column;width:55%;display:flex}.doc-tabs{border-bottom:1px solid var(--plat-border);background:var(--plat-bg);padding:0 1rem;display:flex;overflow-x:auto}.doc-tab{font-family:var(--font-mono);color:var(--plat-text-sec);cursor:pointer;border-bottom:2px solid #0000;align-items:center;gap:.5rem;padding:1rem 1.5rem;font-size:.8rem;display:flex}.doc-tab.active{color:var(--plat-primary);border-bottom-color:var(--plat-primary);background:var(--plat-surface)}.doc-tab svg{stroke:currentColor;fill:none;width:14px;height:14px}.doc-content{flex-grow:1;padding:3rem 4rem;overflow-y:auto}.markdown-body{font-family:var(--font-body);color:var(--plat-text-main);line-height:1.7}.markdown-body h1{letter-spacing:-.02em;margin-bottom:1.5rem;font-size:2rem;font-weight:800}.markdown-body h2{border-bottom:1px solid var(--plat-border);margin-top:2rem;margin-bottom:1rem;padding-bottom:.5rem;font-size:1.3rem;font-weight:600}.markdown-body h3{margin-top:1.5rem;margin-bottom:.75rem;font-size:1.1rem;font-weight:600}.markdown-body p{color:var(--plat-text-sec);margin-bottom:1rem}.markdown-body ul{color:var(--plat-text-sec);margin-bottom:1rem;padding-left:1.5rem}.markdown-body li{margin-bottom:.5rem}.markdown-body code{font-family:var(--font-mono);background:var(--plat-bg);color:var(--plat-primary);border-radius:4px;padding:.2em .4em;font-size:.85em}.markdown-body .code-block{background:var(--plat-bg);border:1px solid var(--plat-border);font-family:var(--font-mono);color:var(--plat-text-sec);border-radius:8px;margin:1rem 0;padding:1rem;font-size:.85rem;overflow-x:auto}.system-action{background:var(--plat-bg);border:1px solid var(--plat-border);color:var(--plat-text-sec);border-radius:8px;align-items:center;gap:.75rem;margin-top:.5rem;padding:.75rem 1rem;font-size:.8rem;display:flex}.system-action svg{width:16px;height:16px;stroke:var(--plat-gold);fill:none;animation:3s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}