:root{--bg:#fff;--surface:#f9fafb;--ink:#111827;--ink-2:#374151;--muted:#6b7280;--soft:#9ca3af;--line:#e5e7eb;--line-strong:#d1d5db;--accent:#3d8c78;--accent-deep:#2f6f5f;--accent-soft:#eef6f2;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-pill:999px;--shadow-sm:0 1px 2px #1118270a, 0 1px 3px #1118270f;--shadow-md:0 4px 12px #11182712, 0 2px 4px #1118270d;--font:ui-sans-serif, system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;--font-mono:ui-monospace, "Cascadia Code", "SF Mono", Menlo, Consolas, monospace;--shell:880px;--shell-narrow:720px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--ink);font-family:var(--font);-webkit-font-smoothing:antialiased;margin:0;font-size:16px;line-height:1.7}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer}::selection{background:#3d8c782e}:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}.shell{width:min(calc(100% 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