:root{--bg: #f4f6f9;--bg-elev: #ffffff;--bg-elev-2: #eef1f6;--border: #e2e6ed;--border-strong: #cbd2dd;--text: #1a1f28;--text-dim: #5a6472;--text-faint: #8a93a3;--accent: #2563eb;--accent-hover: #1d4ed8;--ok: #059669;--warn: #b45309;--danger: #dc2626;--radius: 8px;--shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 1px 3px rgba(16, 24, 40, .06);--mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,PingFang SC,Microsoft YaHei,sans-serif;font-size:14px;line-height:1.6;-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.shell{display:flex;min-height:100vh}.sidebar{width:200px;flex-shrink:0;background:var(--bg-elev);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:16px 0}.sidebar-brand{padding:0 20px 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var(--border-strong);border-radius:8px;background:#fff;cursor:pointer;transition:border-color .12s,background .12s}.mode-card:hover{border-color:#adb6c4}.mode-card.on{border-color:var(--accent);background:#eff6ff}.mode-card input{width:auto;margin:2px 0 0;accent-color:var(--accent);flex:0 0 auto}.mode-card strong{display:block;font-size:13px;font-weight:600}.mode-card small{display:block;color:var(--text-faint);font-size:11px;margin-top:2px;line-height:1.5}