:root{--primary:#f97316;--primary-hover:#ea580c;--bg:#f8fafc;--sidebar:#fff;--text:#0f172a;--text-dim:#64748b;--border:#e2e8f0;--radius:8px}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;font-family:Inter,system-ui,-apple-system,sans-serif}.layout{height:100vh;display:flex;overflow:hidden}.sidebar{background:var(--sidebar);border-right:1px solid var(--border);flex-direction:column;gap:32px;width:320px;padding:24px;display:flex;overflow-y:auto}.logo{color:var(--primary);letter-spacing:-.025em;align-items:center;gap:8px;font-size:1.25rem;font-weight:800;display:flex}.section{flex-direction:column;gap:12px;display:flex}.section-title{text-transform:uppercase;color:var(--text-dim);letter-spacing:.05em;font-size:.75rem;font-weight:600}.card{border-radius:var(--radius);border:1px solid var(--border);background:#f1f5f9;flex-direction:column;gap:12px;padding:16px;display:flex}input,select{border:1px solid var(--border);background:#fff;border-radius:6px;width:100%;padding:10px 12px;font-size:.875rem}.btn{cursor:pointer;border:none;border-radius:6px;justify-content:center;align-items:center;gap:8px;padding:10px 16px;font-size:.875rem;font-weight:600;transition:all .2s;display:flex}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover);transform:translateY(-1px)}.btn-ghost{color:var(--text-dim);border:1px solid var(--border);background:0 0}.btn-ghost:hover{color:var(--text);background:#f1f5f9}.main{background:#fff;flex-direction:column;flex:1;display:flex}.chat-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:16px 24px;display:flex}.message-list{flex-direction:column;flex:1;gap:24px;padding:24px;display:flex;overflow-y:auto}.message{border-radius:var(--radius);max-width:80%;padding:16px;font-size:.9375rem;line-height:1.5}.message.user{color:#1e3a8a;background:#eff6ff;border:1px solid #dbeafe;align-self:flex-end}.message.assistant{border:1px solid var(--border);background:#f8fafc;align-self:flex-start}.chat-footer{border-top:1px solid var(--border);padding:24px}.input-area{gap:12px;display:flex}.input-area input{flex:1;padding:14px 18px;font-size:1rem}.toggle-group{cursor:pointer;align-items:center;gap:8px;font-size:.875rem;display:flex}.toggle-group input{width:auto}