:root { --bg: #ffffff; --sidebar: #f7f7f8; --chat-bg: #ffffff; --text: #333333; --accent: #10a37f; --border: #e5e5e5; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; background: var(--bg); color: var(--text); overflow: hidden; }
.container { display: flex; height: 100vh; }
#login-overlay { position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(255,255,255,0.98);z-index:999;display:flex;justify-content:center;align-items:center;flex-direction:column; }
#login-overlay button { padding:15px 30px;background:#333;color:#fff;border:none;cursor:pointer;font-weight:bold; border-radius: 5px;}
.sidebar { width: 260px; background: var(--sidebar); border-right: 1px solid var(--border); padding: 10px; display: flex; flex-direction: column; }
.new-chat-btn { background: #fff; border: 1px solid var(--border); border-radius: 5px; padding: 10px; text-align: left; cursor: pointer; display: flex; align-items: center; gap: 10px; font-size: 14px; margin-bottom: 20px; transition: 0.2s; }
.new-chat-btn:hover { background: #ececf1; }
.section-header { font-size: 11px; font-weight: 600; color: #888; padding: 10px 10px 5px 10px; margin-top: 10px; text-transform: uppercase; }
.project-item { padding: 8px 10px; font-size: 14px; color: #333; cursor: pointer; border-radius: 5px; }
.project-item:hover { background: #ececf1; }
.project-item.active { background: #ececf1; font-weight: 500; }
.action-link { background: none; border: none; color: var(--accent); text-align: left; padding: 5px 10px; cursor: pointer; font-size: 13px; }
.status-box { margin-top: auto; padding: 10px; font-size: 12px; color: #888; border-top: 1px solid var(--border); }
.main { flex: 1; display: flex; flex-direction: column; background: var(--chat-bg); position: relative; }
.tab-content { display: none; height: 100%; flex-direction: column; }
.tab-content.active { display: flex; }
.chat-window { flex: 1; overflow-y: auto; padding: 0; display: flex; flex-direction: column; }
.msg-row { padding: 30px; border-bottom: 1px solid transparent; display: flex; justify-content: center; }
.msg-row.apex { background: #f7f7f8; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.msg-content { max-width: 800px; width: 100%; line-height: 1.6; font-size: 16px; display: flex; gap: 20px; }
.avatar { width: 30px; height: 30px; border-radius: 3px; display: flex; align-items: center; justify-content: center; font-size: 18px; font-weight: bold; }
.user .avatar { background: #777; color: #fff; }
.apex .avatar { background: var(--accent); color: #fff; }
.input-area { padding: 30px; display: flex; justify-content: center; background: transparent; }
.input-box { max-width: 800px; width: 100%; position: relative; display: flex; align-items: center; background: #fff; border: 1px solid rgba(0,0,0,0.1); box-shadow: 0 0 10px rgba(0,0,0,0.05); border-radius: 6px; padding: 5px; }
.attach-btn { background: transparent; border: none; font-size: 20px; cursor: pointer; padding: 0 10px; color: #aaa; }
.attach-btn:hover { color: #333; }
input { flex: 1; border: none; padding: 10px; font-family: inherit; font-size: 16px; outline: none; }
.send-btn { background: transparent; border: none; cursor: pointer; color: #ccc; font-size: 18px; padding: 0 10px; }
.send-btn:hover { color: var(--accent); }
#network-viz { flex: 1; background: #fff; }