:root{--bg-dark:#0d1117;--bg-panel:#161b22;--bg-hover:#21262d;--text-main:#c9d1d9;--text-muted:#8b949e;--accent:#3da99f;--accent-hover:#348f86;--danger:#f85149;--success:#2ea043;--text-xs:12px;--text-sm:14px;--text-base:16px;--text-lg:18px;--text-xl:22px;--border:1px solid #30363d;--radius:8px}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-dark);color:var(--text-main);font-family:Inter,sans-serif;font-size:var(--text-base);-webkit-font-smoothing:antialiased;line-height:1.5}.app-container{flex-direction:column;height:100vh;display:flex;overflow:hidden}.sidebar{background-color:var(--bg-panel);border-right:var(--border);flex-direction:column;width:270px;height:100vh;display:none}.sidebar-header{border-bottom:var(--border);padding:20px}.nav-links{flex:1;padding:10px 0;list-style:none;overflow-y:auto}.nav-links li.divider{background:#30363d;height:1px;margin:10px 20px}.nav-links a{color:var(--text-muted);justify-content:space-between;align-items:center;padding:10px 20px;text-decoration:none;transition:all .2s;display:flex}.nav-links a:hover{color:var(--text-main);background:var(--bg-hover)}.nav-links a.active{color:#fff;background:var(--accent);font-weight:600}.badge{font-size:var(--text-xs);background:#30363d;border-radius:4px;padding:2px 6px;font-weight:700}.content-area{padding:20px;padding-bottom:calc(100px + env(safe-area-inset-bottom));flex:1;overflow-y:auto}.page-section{max-width:800px;margin:0 auto;animation:.3s fadeIn;display:none}.page-section.active{display:block}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.section-header{margin-bottom:24px}.section-header h1{font-size:var(--text-xl);color:#fff}.section-header p{color:var(--text-muted);margin-top:4px}.stats-grid{grid-template-columns:1fr 1fr;gap:12px;margin-bottom:24px;display:grid}.stat-card{background:var(--bg-panel);border-radius:var(--radius);border:var(--border);text-align:center;padding:20px}.stat-card h3{font-size:var(--text-sm);color:var(--text-muted);font-weight:500}.stat-val{color:#fff;margin-top:8px;font-size:32px;font-weight:700}.quick-actions{flex-direction:column;gap:12px;display:flex}.hide-desktop{display:none}.hide-mobile{display:inline}@media (width<=767px){.hide-desktop{display:inline!important}.hide-mobile{display:none!important}}.btn{border-radius:var(--radius);cursor:pointer;font-weight:600;font-size:var(--text-base);border:none;justify-content:center;align-items:center;min-height:48px;padding:12px 16px;transition:all .2s;display:inline-flex}.btn-block{width:100%}.btn-sm{min-height:unset;font-size:var(--text-sm);padding:8px 12px}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover:not(:disabled){background:var(--accent-hover)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:var(--bg-panel);color:var(--text-main);border:var(--border)}.btn-secondary:hover{background:var(--bg-hover)}.form-group{margin-bottom:16px}.form-group label{color:var(--text-muted);font-weight:500;font-size:var(--text-sm);margin-bottom:6px;display:block}.input-field{border-radius:var(--radius);border:var(--border);background:var(--bg-dark);color:#fff;outline:none;width:100%;padding:12px;font-family:inherit;font-size:16px}.input-field:focus{border-color:var(--accent)}.workflow-selector h3{font-size:var(--text-sm);color:var(--text-muted);margin-bottom:10px}.workflow-cards{flex-direction:row;gap:8px;margin-bottom:24px;display:flex}.wf-card{background:var(--bg-panel);border-radius:var(--radius);cursor:pointer;text-align:center;border:2px solid #30363d;flex-direction:column;flex:1;justify-content:center;align-items:center;padding:12px 8px;transition:all .2s;display:flex}.wf-card.selected{border-color:var(--accent);background:#3da99f1a}.wf-icon{display:none}.wf-card h4{font-size:var(--text-base);color:#fff;margin-bottom:2px}.wf-card p{color:var(--text-muted);font-size:11px;line-height:1.2}.file-drop-area{border-radius:var(--radius);text-align:center;cursor:pointer;background:var(--bg-panel);border:2px dashed #30363d;margin-bottom:24px;padding:40px 20px;transition:all .2s;position:relative}.file-drop-area.dragover{border-color:var(--accent);background:#8957e50d}.file-drop-area input[type=file]{opacity:0;cursor:pointer;width:100%;height:100%;position:absolute;top:0;left:0}.drop-icon{margin-bottom:12px;font-size:40px;display:block}.drop-text{color:var(--text-muted)}.drop-text.file-selected{color:var(--success);font-weight:600}.loading-state{text-align:center;padding:40px 0}.spinner{border:4px solid var(--bg-hover);border-top-color:var(--accent);border-radius:50%;width:40px;height:40px;margin:0 auto 16px;animation:1s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.hidden{display:none!important}.dialogue-layout{flex-direction:column;gap:20px;height:calc(100vh - 200px);display:flex}.invoice-summary-panel{background:var(--bg-panel);border:var(--border);border-radius:var(--radius);padding:16px}.invoice-summary-panel h3{font-size:var(--text-sm);color:var(--text-muted);margin-bottom:10px}.invoice-field{font-size:var(--text-sm);border-bottom:1px solid #30363d;justify-content:space-between;margin-bottom:6px;padding-bottom:4px;display:flex}.chat-panel{background:var(--bg-panel);border:var(--border);border-radius:var(--radius);flex-direction:column;flex:1;display:flex;overflow:hidden}.chat-history{flex-direction:column;flex:1;gap:16px;padding:20px;display:flex;overflow-y:auto}.msg{max-width:85%;font-size:var(--text-base);white-space:pre-wrap;border-radius:12px;padding:12px 16px}.msg.bot{background:#21262d;border-bottom-left-radius:2px;align-self:flex-start}.msg.user{background:var(--accent);color:#fff;border-bottom-right-radius:2px;align-self:flex-end}.chat-input-area{border-top:var(--border);background:var(--bg-panel);padding:12px;display:flex}.chat-input-area input{background:var(--bg-dark);color:#fff;border-radius:var(--radius);border:none;outline:none;flex:1;margin-right:12px;padding:12px;font-size:16px}.chat-input-area button{padding:0 24px}.bottom-nav{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-top:var(--border);width:100%;padding:8px 0 env(safe-area-inset-bottom) 0;z-index:100;background:#161b22f2;justify-content:space-around;display:flex;position:fixed;bottom:0;left:0}.nav-item{color:var(--text-muted);flex-direction:column;flex:1;justify-content:center;align-items:center;padding:6px;text-decoration:none;display:flex}.nav-item .icon{margin-bottom:4px;font-size:24px}.nav-item .label{font-size:11px;font-weight:500}.nav-item.active{color:var(--accent)}.mobile-header{background:var(--bg-panel);border-bottom:var(--border);text-align:center;font-weight:600;font-size:var(--text-lg);color:#fff;z-index:90;padding:14px 20px;display:block}.nav-drawer{background:var(--bg-panel);z-index:99;width:100%;padding:20px;padding-bottom:calc(20px + 60px + env(safe-area-inset-bottom));border-top-left-radius:16px;border-top-right-radius:16px;transition:bottom .3s;position:fixed;bottom:-100%;left:0;box-shadow:0 -4px 20px #00000080}.nav-drawer.open{bottom:0}.drawer-overlay{z-index:98;background:#00000080;width:100%;height:100%;display:none;position:fixed;top:0;left:0}.drawer-overlay.open{display:block}.drawer-links{flex-direction:column;gap:16px;list-style:none;display:flex}.drawer-links a{color:var(--text-main);font-size:var(--text-lg);border-bottom:1px solid #30363d;padding:12px 0;text-decoration:none;display:block}@media (width>=768px){.app-container{flex-direction:row}.sidebar{display:flex}.bottom-nav,.mobile-header{display:none}.content-area{padding:40px}.stats-grid{grid-template-columns:repeat(4,1fr)}.quick-actions,.workflow-cards{flex-direction:row}.wf-card{flex:1}.dialogue-layout{flex-direction:row}.invoice-summary-panel{width:300px}}