:root{--color-primary:#2d6a4f;--color-primary-light:#40916c;--color-primary-subtle:#d8f3dc;--color-bg:#fafaf7;--color-bg-chat:#fff;--color-bg-agent:#f0f7f4;--color-bg-user:#2d6a4f;--color-text:#1a1a1a;--color-text-secondary:#6b7280;--color-text-on-primary:#fff;--color-border:#e5e7eb;--color-divider:#f3f4f6;--shadow-sm:0 1px 2px #0000000a;--shadow-md:0 4px 12px #0000000f;--shadow-chat:0 -1px 4px #00000008;--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-6:24px;--space-8:32px;--radius-sm:6px;--radius-md:12px;--radius-lg:16px;--font-body:"LXGW WenKai", "Noto Sans SC", sans-serif;--font-number:"DM Sans", "LXGW WenKai", sans-serif}*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;font-family:var(--font-body);color:var(--color-text);background:var(--color-bg);font-size:15px;line-height:1.6}.app-layout{height:100vh;display:flex}.sidebar{background:var(--color-bg-chat);border-right:1px solid var(--color-border);width:200px;padding:var(--space-6) 0;flex-direction:column;flex-shrink:0;display:flex}.sidebar-logo{padding:0 var(--space-6);margin-bottom:var(--space-8);color:var(--color-primary);font-size:24px;font-weight:700}.sidebar-nav{gap:var(--space-1);flex-direction:column;list-style:none;display:flex}.sidebar-nav a{padding:var(--space-3) var(--space-6);color:var(--color-text-secondary);border-left:3px solid #0000;font-size:15px;font-weight:500;text-decoration:none;transition:background .12s;display:block}.sidebar-nav a:hover{background:var(--color-divider)}.sidebar-nav a.active{background:var(--color-primary-subtle);color:var(--color-primary);border-left-color:var(--color-primary)}.main-content{flex:1;justify-content:center;display:flex;overflow:hidden}.chat-panel{flex-direction:column;width:100%;max-width:720px;height:100vh;display:flex}.chat-messages{padding:var(--space-6) var(--space-4);flex:1;overflow-y:auto}.chat-input-area{padding:var(--space-4);background:var(--color-bg-chat);box-shadow:var(--shadow-chat)}.message-list{gap:var(--space-3);flex-direction:column;list-style:none;display:flex}.message{max-width:85%;padding:var(--space-3) var(--space-4);border-radius:var(--radius-md);line-height:1.6}.message-user{background:var(--color-bg-user);color:var(--color-text-on-primary);border-top-right-radius:var(--radius-sm);align-self:flex-end;max-width:75%}.message-assistant{background:var(--color-bg-agent);color:var(--color-text);border-left:3px solid var(--color-primary);border-top-left-radius:var(--radius-sm);align-self:flex-start}.message-assistant .message-content p{margin:0 0 var(--space-2) 0}.message-assistant .message-content p:last-child{margin-bottom:0}.message-assistant .message-content ol,.message-assistant .message-content ul{margin:var(--space-2) 0;padding-left:var(--space-6)}.message-assistant .message-content li{margin-bottom:var(--space-1)}.message-assistant .message-content strong{color:var(--color-primary)}.message-assistant .message-content table{border-collapse:collapse;width:100%;margin:var(--space-3) 0;font-size:14px}.message-assistant .message-content th,.message-assistant .message-content td{padding:var(--space-2) var(--space-3);text-align:left;border-bottom:1px solid var(--color-border)}.message-assistant .message-content th{background:var(--color-primary-subtle);color:var(--color-primary);font-size:13px;font-weight:600}.message-assistant .message-content tr:last-child td{border-bottom:none}.message-assistant .message-content tr:hover td{background:#2d6a4f0a}.message-input-form{gap:var(--space-2);background:var(--color-bg-chat);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-2) var(--space-3);align-items:center;display:flex}.message-input{font-family:var(--font-body);color:var(--color-text);background:0 0;border:none;outline:none;flex:1;font-size:15px}.message-input::placeholder{color:var(--color-text-secondary)}.send-button{background:var(--color-primary);color:#fff;cursor:pointer;border:none;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;font-size:16px;transition:background .1s,transform .1s;display:flex}.send-button:hover:not(:disabled){background:var(--color-primary-light);transform:scale(1.05)}.send-button:disabled{opacity:.4;cursor:not-allowed}.thinking{padding:var(--space-2) 0;gap:6px;display:flex}.thinking-dot{background:var(--color-primary-light);border-radius:50%;width:8px;height:8px;animation:1.4s ease-in-out infinite thinking}.thinking-dot:nth-child(2){animation-delay:.16s}.thinking-dot:nth-child(3){animation-delay:.32s}@keyframes thinking{0%,80%,to{opacity:.3;transform:scale(.8)}40%{opacity:1;transform:scale(1)}}@keyframes messageIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.message{animation:.2s ease-out messageIn}