:root{--bg: #0a0e14;--surface: #10151d;--surface-hi: #161d27;--line: #1d2733;--line-soft: #151c25;--text: #c5cfdb;--text-dim: #66717f;--text-faint: #454f5c;--neutron: #4dd4e8;--neutron-dim: #2a7d8c;--pos: #3fd68c;--neg: #ff5f56;--warn: #e3a33c;--mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;--sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);-webkit-font-smoothing:antialiased}.topbar{display:flex;align-items:baseline;gap:16px;padding:14px 22px;border-bottom:1px solid var(--line);background:var(--surface);position:sticky;top:0;z-index:10;flex-wrap:wrap}.brand{font-size:15px;font-weight:600;letter-spacing:.16em;color:var(--text)}.brand 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