:root{--ve-red-050:#fdecec;--ve-red-500:#ec1f27;--ve-red-600:#c3251d;--ve-red-800:#970224;--ve-green-050:#f2f7e6;--ve-green-400:#a4cf63;--ve-green-700:#7d9a34;--ve-ink-900:#050504;--ve-ink-800:#19242e;--ve-ink-700:#333;--ve-ink-600:#505050;--ve-ink-500:#a4a4a4;--ve-ink-300:#ccc;--ve-ink-200:#eee;--ve-ink-100:#f7f7f7;--ve-ink-000:#fff;--ve-teal-500:#2db69e;--ve-amber-500:#eea82f;--bg-primary:var(--ve-ink-100);--bg-secondary:var(--ve-ink-000);--bg-tertiary:var(--ve-ink-100);--bg-hover:var(--ve-green-050);--text-primary:var(--ve-ink-900);--text-secondary:var(--ve-ink-600);--text-muted:var(--ve-ink-500);--accent:var(--ve-red-500);--accent-hover:var(--ve-green-400);--accent-glow:#ec1f2738;--success:var(--ve-teal-500);--warning:var(--ve-amber-500);--error:var(--ve-red-600);--border:#00000020;--border-focus:var(--ve-red-500);--radius-sm:4px;--radius-md:8px;--radius-lg:12px}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg-primary);color:var(--text-primary);font-family:Roboto,Helvetica,Arial,sans-serif;line-height:1.6}.app-container{flex-direction:column;min-height:100vh;display:flex}.header{background:var(--ve-red-500);border-bottom:1px solid var(--ve-red-800);z-index:100;justify-content:space-between;align-items:center;padding:16px 24px;display:flex;position:sticky;top:0;box-shadow:0 2px 8px #05050429}.header-left{align-items:center;gap:12px;display:flex}.header h1{color:var(--ve-ink-000);font-size:20px;font-weight:600}.header-right{align-items:center;gap:16px;display:flex}.save-status{color:var(--ve-ink-000);border-radius:var(--radius-sm);background:#ffffff29;padding:6px 12px;font-size:13px}.save-status.unsaved{color:var(--ve-ink-900);background:var(--ve-amber-500)}.main-layout{flex:1;display:flex}.sidebar{background:var(--bg-secondary);border-right:1px solid var(--border);width:220px;padding:16px 0;box-shadow:2px 0 8px #0505040d}.nav-item{color:var(--text-secondary);align-items:center;gap:10px;padding:12px 20px;font-size:14px;text-decoration:none;transition:all .15s;display:flex}.nav-item:hover{background:var(--bg-hover);color:var(--text-primary)}.nav-item.active{background:var(--accent-glow);color:var(--accent);border-right:4px solid var(--accent)}.content{flex:1;max-width:1120px;padding:32px}.page-title{margin-bottom:24px;font-size:24px;font-weight:600}.form-group{margin-bottom:24px}.form-label{color:var(--text-secondary);margin-bottom:8px;font-size:13px;font-weight:500;display:block}.form-input,.form-select,.form-textarea{background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-md);width:100%;color:var(--text-primary);padding:12px 14px;font-family:inherit;font-size:14px;transition:border-color .15s}.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px var(--accent-glow);outline:none}.form-textarea{resize:vertical;min-height:200px}.form-textarea.tall{min-height:300px}.btn{letter-spacing:1.4px;text-transform:uppercase;cursor:pointer;border:none;border-radius:0;justify-content:center;align-items:center;gap:8px;padding:10px 20px;font-size:14px;font-weight:700;transition:all .15s;display:inline-flex}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover);color:var(--ve-ink-900)}.btn:disabled{cursor:not-allowed;opacity:.55}.header .btn-primary{background:var(--ve-ink-000);color:var(--ve-red-600)}.header .btn-primary:hover:not(:disabled){background:var(--ve-green-400);color:var(--ve-ink-900)}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover{background:var(--bg-hover)}.header .btn-secondary{color:var(--ve-ink-000);background:0 0;border-color:#ffffffa6}.header .btn-secondary:hover{background:var(--ve-ink-000);color:var(--ve-red-600)}.btn-danger{background:var(--error);color:#fff}.card{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-lg);margin-bottom:16px;padding:20px;box-shadow:0 1px 3px #05050414}.toggle-container{align-items:center;gap:12px;display:flex}.toggle{background:var(--bg-tertiary);cursor:pointer;border-radius:12px;width:44px;height:24px;transition:background .2s;position:relative}.toggle.active{background:var(--accent)}.toggle:after{content:"";background:#fff;border-radius:50%;width:20px;height:20px;transition:transform .2s;position:absolute;top:2px;left:2px}.toggle.active:after{transform:translate(20px)}.knowledge-list{flex-direction:column;gap:8px;display:flex}.knowledge-item{background:var(--bg-tertiary);border-radius:var(--radius-md);justify-content:space-between;align-items:center;padding:12px 16px;display:flex}.knowledge-item-title{font-weight:500}.knowledge-item-meta{color:var(--text-muted);font-size:12px}.dropzone{border:2px dashed var(--border);border-radius:var(--radius-lg);text-align:center;cursor:pointer;padding:40px;transition:all .2s}.dropzone:hover{border-color:var(--accent);background:var(--accent-glow)}.dropzone-text{color:var(--text-secondary);font-size:14px}@media (width<=800px){.header{flex-direction:column;align-items:flex-start;gap:12px}.header-right{flex-wrap:wrap}.main-layout{flex-direction:column}.sidebar{border-right:0;border-bottom:1px solid var(--border);width:100%;padding:0;display:flex;overflow-x:auto}.nav-item{white-space:nowrap}.nav-item.active{border-right:0;border-bottom:4px solid var(--accent)}.content{padding:20px}}