:root{--bg: #f4f5fb;--card: #ffffff;--text: #1e2433;--muted: #6f7891;--border: #e7e9f2;--accent: #4f46e5;--accent-dark: #4338ca;--accent-soft: rgba(79, 70, 229, .08);--grad: linear-gradient(135deg, #4f46e5, #7c3aed);--grad-soft: linear-gradient(180deg, #ffffff, #fbfbff);--radius: 16px;--radius-sm: 12px;--shadow-sm: 0 1px 2px rgba(16, 24, 40, .04), 0 2px 6px rgba(16, 24, 40, .04);--shadow-card: 0 1px 2px rgba(16, 24, 40, .04), 0 10px 24px rgba(16, 24, 40, .06);--shadow-hover: 0 6px 12px rgba(79, 70, 229, .1), 0 18px 36px rgba(79, 70, 229, .14);--lv-n5: #10b981;--lv-n4: #0d9488;--lv-n3: #2563eb;--lv-n2: #d97706;--lv-n1: #dc2626}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Noto Sans SC,sans-serif;font-size:15px;line-height:1.65;-webkit-font-smoothing:antialiased;background:radial-gradient(900px 420px at 12% -8%,rgba(124,58,237,.1),transparent 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