:root{--bg: #121212;--bg2: #1e1e1e;--fg: #e0e0e0;--muted: #999;--accent: #4a9eff;--border: #2a2a2a}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif}.center{display:flex;align-items:center;justify-content:center;height:100%}.auth form{display:flex;flex-direction:column;gap:12px;width:280px}.auth h1{margin:0;text-align:center}.auth p{margin:0;text-align:center;color:var(--muted)}.auth input{padding:10px;border:1px solid var(--border);border-radius:6px;background:var(--bg2);color:var(--fg)}.auth button{padding:10px;border:none;border-radius:6px;background:var(--accent);color:#fff;cursor:pointer}.app{display:flex;flex-direction:column;height:100%}.topbar{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;background:var(--bg2);border-bottom:1px solid 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