:root{--bg:#f5f6f8;--panel:#fff;--border:#e2e5ea;--text:#1f2430;--muted:#6b7280;--accent:#2563eb;--accent-weak:#eaf0fe;--green:#15803d;--green-bg:#e7f6ec;--red:#b91c1c;--red-bg:#fdeaea;--amber:#92600a;--amber-bg:#fdf3e0;--gray-bg:#eef0f3}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Hiragino Kaku Gothic ProN,Noto Sans JP,sans-serif;font-size:14px;line-height:1.5}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.app-header{background:var(--panel);border-bottom:1px solid var(--border);padding:10px 20px;position:-webkit-sticky;position:sticky;top:0;z-index:10}.app-header-top{display:flex;align-items:center;gap:12px}.app-header .brand{font-weight:700;white-space:nowrap}.app-header .spacer{flex:1 1}.app-header nav{display:flex;gap:16px;margin-top:8px;flex-wrap:wrap}.app-header nav a{color:var(--text);padding:2px 0}.app-header nav 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