:root{--bg:#f6f7f8;--surface:#fff;--surface-soft:#eef3f2;--ink:#16202a;--muted:#62717f;--border:#d9e0e4;--accent:#0f766e;--accent-strong:#0b5f59;--warm:#b45309;--danger:#b42318;--shadow:0 18px 45px #19232c1f}*{box-sizing:border-box}html{min-height:100%}body{background:var(--bg);min-height:100%;color:var(--ink);letter-spacing:0;margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input,textarea{font:inherit}button{background:var(--accent);border:1px solid var(--accent);color:#fff;cursor:pointer;border-radius:8px;justify-content:center;align-items:center;gap:8px;min-height:42px;padding:0 14px;font-weight:700;transition:background .16s,border-color .16s,color .16s;display:inline-flex}button:hover:not(:disabled){background:var(--accent-strong);border-color:var(--accent-strong)}button:disabled{cursor:not-allowed;opacity:.58}label{color:var(--ink);gap:8px;font-size:.88rem;font-weight:700;display:grid}input,textarea{border:1px solid var(--border);color:var(--ink);background:#fff;border-radius:8px;outline:none;width:100%;padding:11px 12px}textarea{resize:vertical;min-height:180px}input:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px #0f766e29}.home-shell{height:100vh;overflow:hidden}.eyebrow{color:var(--accent);letter-spacing:0;text-transform:uppercase;margin:0;font-size:.78rem;font-weight:800}.home-upload-screen{text-align:center;place-content:center;align-items:center;gap:32px;height:100%;padding:24px;display:grid}.home-upload-content{justify-items:center;gap:12px;max-width:720px;display:grid}.home-upload-content h1{margin:0;font-size:clamp(2.6rem,7vw,5rem);line-height:.98}.home-upload-content p:not(.eyebrow){color:var(--muted);max-width:520px;margin:0;font-size:1.08rem;line-height:1.5}.home-uploader{justify-self:center;justify-items:center;gap:14px;width:min(100%,420px);display:grid}.primary-upload-button{background:var(--accent);border:1px solid var(--accent);color:#fff;cursor:pointer;border-radius:8px;justify-content:center;align-items:center;gap:10px;width:min(100%,320px);min-height:64px;padding:0 26px;font-size:1.05rem;font-weight:800;transition:background .16s,border-color .16s,box-shadow .16s,transform .16s;display:inline-flex;position:relative;box-shadow:0 14px 36px #0f766e33}.primary-upload-button:hover:not(:disabled){background:var(--accent-strong);border-color:var(--accent-strong);transform:translateY(-1px);box-shadow:0 16px 40px #0f766e47}.primary-upload-button:disabled{cursor:wait;opacity:.72}.screen-reader-file-input{display:none}.upload-note{color:var(--muted);margin:0;font-size:.9rem}.file-picker{color:#344453;cursor:pointer;background:#fff;border:1px dashed #9aa8b4;border-radius:8px;justify-content:center;align-self:end;align-items:center;gap:8px;min-height:46px;padding:0 12px;font-weight:800;display:flex;position:relative}.file-picker input{opacity:0;position:absolute;inset:0}.file-picker.compact{margin:2px 0}.form-error{color:var(--danger);background:#fff1f0;border:1px solid #ffccc7;border-radius:8px;margin:0;padding:10px 12px;font-weight:700}.document-shell{grid-template-columns:280px minmax(0,1fr) 360px;height:100vh;display:grid;overflow:hidden}.document-shell.revision-collapsed{grid-template-columns:52px minmax(0,1fr) 360px}.document-shell.chat-collapsed{grid-template-columns:280px minmax(0,1fr) 52px}.document-shell.revision-collapsed.chat-collapsed{grid-template-columns:52px minmax(0,1fr) 52px}.center-state{text-align:center;align-content:center;justify-items:center;gap:12px;display:grid}.spin{animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.preview-pane{background:#fff;min-width:0;overflow:hidden}.preview-frame{background:#fff;border:0;width:100%;height:100%}.revision-sidebar,.chat-sidebar{background:#fff;gap:12px;min-height:0;padding:12px;display:grid;overflow:hidden}.revision-sidebar{border-right:1px solid var(--border);grid-template-rows:auto minmax(0,1fr) auto}.chat-sidebar{border-left:1px solid var(--border);grid-template-rows:auto auto minmax(0,1fr) auto auto}.revision-collapsed .revision-sidebar,.chat-collapsed .chat-sidebar{align-content:start;justify-items:center;padding:8px 6px}.sidebar-topbar{justify-content:space-between;align-items:center;gap:10px;min-height:36px;display:flex}.icon-button,.sidebar-icon-button{border-color:var(--border);color:var(--ink);background:#fff;width:34px;min-height:34px;padding:0}.icon-button:hover:not(:disabled),.sidebar-icon-button:hover:not(:disabled){background:var(--surface-soft);color:var(--ink);border-color:#b9c7ca}.panel-title{align-items:center;gap:8px;min-width:0;display:flex}.panel-title svg{color:var(--accent)}.panel-title h2{margin:0;font-size:1rem}.identity-row{grid-template-columns:auto minmax(0,1fr);align-items:center;gap:10px;display:grid}.chat-identity{border-bottom:1px solid var(--border);grid-template-columns:auto auto minmax(0,1fr);padding-bottom:12px}.chat-identity svg{color:var(--muted)}.avatar-dot{border-radius:999px;flex:none;width:22px;height:22px;display:inline-block}.tree-list{grid-auto-rows:min-content;align-content:start;align-items:start;gap:4px;min-height:0;padding-right:2px;display:grid;overflow-y:auto}.tree-item{color:var(--ink);text-align:left;background:0 0;border:1px solid #0000;justify-content:flex-start;min-height:36px;padding-right:10px;overflow:hidden}.tree-item span{text-overflow:ellipsis;white-space:nowrap;min-width:0;overflow:hidden}.tree-item:hover:not(:disabled){background:var(--surface-soft);border-color:var(--border);color:var(--ink)}.tree-item.active{color:var(--accent-strong);background:#e5f4f2;border-color:#a8d9d4}.revision-upload{border-top:1px solid var(--border);gap:10px;padding-top:12px;display:grid}.revision-upload button{width:100%}.message-form{gap:10px;display:grid}.message-list{grid-auto-rows:min-content;align-content:start;align-items:start;gap:10px;min-height:0;padding-right:4px;display:grid;overflow-y:auto}.message{border:1px solid var(--border);background:#f8fafb;border-radius:8px;padding:12px}.message-meta{color:var(--muted);flex-wrap:wrap;align-items:center;gap:8px;font-size:.82rem;display:flex}.message-meta strong{color:var(--ink)}.message p{white-space:pre-wrap;word-break:break-word;margin:10px 0;line-height:1.5}.message-version{border-color:var(--border);color:var(--accent-strong);background:#fff;min-height:30px;padding:0 9px;font-size:.82rem}.message-version:hover:not(:disabled){color:var(--accent-strong);background:#e5f4f2;border-color:#a8d9d4}.empty-state{color:var(--muted);margin:0}.message-form textarea{min-height:86px}@media (max-width:980px){.document-shell{grid-template-rows:auto minmax(70vh,1fr) auto;grid-template-columns:1fr;height:auto;min-height:100vh;overflow:visible}.document-shell.revision-collapsed,.document-shell.chat-collapsed,.document-shell.revision-collapsed.chat-collapsed{grid-template-columns:1fr}.revision-sidebar,.chat-sidebar{border-left:0;border-right:0;overflow:visible}.revision-sidebar{border-bottom:1px solid var(--border)}.chat-sidebar{border-top:1px solid var(--border)}.preview-frame{min-height:70vh}}@media (max-width:680px){.home-upload-screen{gap:24px;padding:20px}.revision-upload button,.message-form button{width:100%}}