:root{--bg:#fffaf1;--text:#1f2330;--muted:#5e6578;--panel:#fff;--line:#d8d5cc;--accent:#c84c09;--accent-hover:#b04308;--radius-lg:20px;--radius-md:12px;--radius-sm:8px;--shadow-sm:0 1px 2px #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -1px #0000000f;--sidebar-width:280px}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%}body{color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;font-family:Trebuchet MS,Segoe UI,sans-serif;line-height:1.5}a{color:var(--accent);text-decoration:none}button{cursor:pointer;background:0 0;border:none;font-family:inherit}input,textarea{font-family:inherit}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--line);border-radius:10px}::-webkit-scrollbar-thumb:hover{background:var(--muted)}.sidebar-header{flex-direction:column;gap:20px;padding:24px;display:flex}.logo{color:var(--text);align-items:center;gap:12px;font-size:1.25rem;font-weight:700;display:flex}.logo-icon{background:var(--accent);color:#fff;border-radius:var(--radius-sm);justify-content:center;align-items:center;width:32px;height:32px;font-size:1.1rem;display:flex}.new-chat-btn{background:var(--accent);color:#fff;border-radius:var(--radius-md);justify-content:center;align-items:center;gap:8px;width:100%;padding:12px;font-weight:600;transition:background .2s;display:flex}.new-chat-btn:hover{background:var(--accent-hover)}.sidebar-nav{flex:1;padding:0 16px;overflow-y:auto}.nav-group{margin-bottom:24px}.nav-label{color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:8px;padding:0 8px;font-size:.75rem}.nav-item{color:var(--muted);border-radius:var(--radius-md);align-items:center;gap:12px;padding:10px 12px;font-weight:500;transition:all .2s;display:flex}.nav-item:hover{background:var(--bg);color:var(--text)}.nav-item.active{background:var(--bg);color:var(--accent);font-weight:600}.sidebar-footer{border-top:1px solid var(--line);justify-content:space-between;align-items:center;padding:16px;display:flex}.user-profile{align-items:center;gap:12px;display:flex}.user-avatar{background:var(--line);width:36px;height:36px;color:var(--text);border-radius:50%;justify-content:center;align-items:center;font-weight:600;display:flex}.user-name{font-size:.875rem;font-weight:600}.user-plan{color:var(--muted);font-size:.75rem}.logout-btn{color:var(--muted);border-radius:var(--radius-sm);padding:8px;transition:background .2s}.logout-btn:hover{background:var(--bg);color:var(--text)}.view-title{font-size:1.5rem;font-weight:700}.landing-link{color:var(--muted);font-size:.875rem;font-weight:500}.landing-link:hover{color:var(--accent)}.conversations-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px;display:grid}.conversation-card{cursor:pointer;height:200px;color:inherit;flex-direction:column;text-decoration:none;transition:transform .2s,box-shadow .2s;display:flex}.conversation-card:hover{box-shadow:var(--shadow-md);border-color:var(--accent);transform:translateY(-4px)}.card-header{justify-content:space-between;align-items:center;margin-bottom:16px;display:flex}.card-icon{color:var(--accent)}.delete-btn{color:var(--muted);opacity:0;padding:4px;transition:opacity .2s}.conversation-card:hover .delete-btn{opacity:1}.delete-btn:hover{color:#ef4444}.card-title{-webkit-line-clamp:2;-webkit-box-orient:vertical;flex:1;font-size:1.125rem;font-weight:600;display:-webkit-box;overflow:hidden}.card-footer{color:var(--muted);justify-content:space-between;align-items:center;margin-top:auto;font-size:.75rem;display:flex}.updated-at{align-items:center;gap:4px;display:flex}.loading{height:200px;color:var(--muted);justify-content:center;align-items:center;display:flex}.empty-state{text-align:center;color:var(--muted);flex-direction:column;grid-column:1/-1;justify-content:center;align-items:center;padding:64px;display:flex}.empty-icon{opacity:.5;margin-bottom:24px}.chat-container{flex-direction:column;max-width:900px;height:calc(100vh - 120px);margin:0 auto;display:flex}.messages-list{flex-direction:column;flex:1;gap:24px;padding-bottom:40px;display:flex;overflow-y:auto}.message-item{gap:16px;animation:.3s ease-out fadeIn;display:flex}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.message-avatar{border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;font-weight:700;display:flex}.user-avatar{background:var(--line);color:var(--text)}.assistant-avatar{background:var(--accent);color:#fff}.message-content{flex:1;font-size:1rem;line-height:1.6}.chat-input-container{border-top:1px solid var(--line);background:var(--bg);padding-top:24px;position:sticky;bottom:0}.chat-input-wrapper{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);gap:12px;padding:8px 12px;display:flex}.chat-input{resize:none;background:0 0;border:none;outline:none;flex:1;max-height:200px;padding:8px;font-size:1rem}.send-btn{background:var(--accent);color:#fff;border-radius:var(--radius-sm);justify-content:center;align-self:flex-end;align-items:center;width:40px;height:40px;transition:background .2s;display:flex}.send-btn:hover:not(:disabled){background:var(--accent-hover)}.send-btn:disabled{background:var(--line);cursor:not-allowed}.usage-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:24px;margin-bottom:32px;display:grid}.usage-card{align-items:center;gap:20px;display:flex}.usage-icon-wrapper{border-radius:var(--radius-md);justify-content:center;align-items:center;width:56px;height:56px;display:flex}.usage-icon-wrapper.blue{color:#3b82f6;background:#3b82f61a}.usage-icon-wrapper.orange{color:var(--accent);background:#c84c091a}.usage-icon-wrapper.green{color:#22c55e;background:#22c55e1a}.usage-icon-wrapper.purple{color:#a855f7;background:#a855f71a}.usage-label{color:var(--muted);margin-bottom:4px;font-size:.875rem}.usage-value{margin-bottom:4px;font-size:1.5rem;font-weight:700}.usage-sub{color:var(--muted);font-size:.75rem}.usage-chart-placeholder{flex-direction:column;min-height:300px;display:flex}.chart-area{color:var(--muted);border:1px dashed var(--line);border-radius:var(--radius-md);flex-direction:column;flex:1;justify-content:center;align-items:center;margin-top:16px;display:flex}.chart-icon{opacity:.3;margin-bottom:16px}.settings-view{flex-direction:column;gap:24px;max-width:800px;margin:0 auto;display:flex}.settings-section{padding:32px}.section-header{color:var(--accent);align-items:center;gap:12px;margin-bottom:24px;display:flex}.section-header h3{color:var(--text);margin:0}.settings-content{flex-direction:column;gap:20px;display:flex}.form-group{flex-direction:column;gap:8px;display:flex}.form-group label{color:var(--muted);font-size:.875rem;font-weight:600}.form-input{border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--bg);color:var(--muted);padding:10px 14px;font-size:1rem}.settings-desc{color:var(--muted);font-size:.9375rem}.plan-badge{background:var(--bg);border-radius:var(--radius-md);justify-content:space-between;align-items:center;padding:16px;display:flex}.plan-label{color:var(--muted);font-size:.875rem}.plan-name{color:var(--accent);font-weight:700}.button-secondary.danger{color:#ef4444;border-color:#ef444433}.button-secondary.danger:hover{background:#ef44440d}.app-container{width:100vw;height:100vh;display:flex;overflow:hidden}.sidebar{width:var(--sidebar-width);background:var(--panel);border-right:1px solid var(--line);flex-direction:column;flex-shrink:0;height:100%;display:flex}.main-content{background:var(--bg);flex-direction:column;flex:1;height:100%;display:flex;overflow:hidden}.topbar{background:var(--panel);border-bottom:1px solid var(--line);flex-shrink:0;justify-content:space-between;align-items:center;height:64px;padding:0 24px;display:flex}.view-container{flex:1;padding:24px;overflow-y:auto}.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:24px}.button-primary{background:var(--accent);color:#fff;border-radius:var(--radius-md);align-items:center;gap:8px;padding:10px 20px;font-weight:600;transition:background .2s;display:inline-flex}.button-primary:hover{background:var(--accent-hover)}.button-secondary{color:var(--text);border:1px solid var(--line);border-radius:var(--radius-md);background:0 0;padding:10px 20px;font-weight:600;transition:background .2s}.button-secondary:hover{background:var(--bg)}@media (width<=768px){.sidebar{display:none}}