:root{--bg: #f4f6fb;--surface: #ffffff;--surface-2: #f8fafc;--border: #e5e9f0;--text: #1f2733;--text-2: #677084;--primary: #3b6ef5;--primary-d: #2f59cc;--income: #16a34a;--expense: #dc2626;--warn: #d97706;--shadow: 0 1px 3px rgba(20, 30, 50, .08), 0 6px 18px rgba(20, 30, 50, .06);--radius: 12px}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:-apple-system,Segoe UI,PingFang SC,Microsoft YaHei,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);font-size:14px;line-height:1.5}a{color:var(--primary);cursor:pointer;text-decoration:none}.app{display:flex;min-height:100vh}.sidebar{width:208px;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:16px 12px;gap:4px;flex-shrink:0}.brand{font-size:17px;font-weight:700;color:var(--primary);padding:6px 10px 14px}.nav-item{display:flex;align-items:center;gap:10px;padding:10px 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