:root{color-scheme:light;--bg: #f4f6f8;--panel: #ffffff;--panel-soft: #f9fbfd;--text: #142033;--muted: #6f7a8a;--line: #e4e8ef;--accent: #1f6feb;--accent-hover: #195cc7;--assistant: #eef5ff;--user: #e9f8ef;--shadow: 0 14px 40px rgba(20, 32, 51, .08)}*{box-sizing:border-box}html,body,#app{width:100%;height:100%;margin:0}body{font-family:Inter,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;color:var(--text);background:radial-gradient(circle at top left,rgba(31,111,235,.1),transparent 28%),radial-gradient(circle at bottom right,rgba(31,111,235,.08),transparent 20%),var(--bg)}button,textarea{font:inherit}.app-shell{display:grid;grid-template-columns:320px 1fr;height:100%;gap:16px;padding:16px}.sidebar,.chat-area{background:#ffffffc7;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid rgba(228,232,239,.9);border-radius:20px;box-shadow:var(--shadow)}.sidebar{display:flex;flex-direction:column;gap:16px;padding:18px;overflow:hidden}.brand{display:flex;align-items:center;gap:12px}.brand h1,.chat-header h2{margin:0;font-size:20px;line-height:1.2}.brand p,.chat-header p,.muted,.role-desc,.session-meta,.bubble-meta,.empty-state{color:var(--muted)}.brand p{margin:4px 0 0;font-size:13px}.brand-badge{width:44px;height:44px;display:grid;place-items:center;border-radius:14px;background:linear-gradient(135deg,var(--accent),#6ea8fe);color:#fff;font-weight:700;letter-spacing:.05em;box-shadow:0 10px 24px #1f6feb42}.brand-info{display:flex;flex-direction:column;gap:6px;flex:1;min-width:0}.user-switcher{display:flex;align-items:center;gap:6px;margin-top:4px}.user-switcher label{font-size:12px;color:var(--muted);white-space:nowrap}.user-switcher input,.user-switcher select{flex:1;min-width:0;padding:4px 8px;font-size:13px;border:1px solid var(--border, 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