:root{--bg: #f5f5f5;--card: rgba(255,255,255,.84);--line: rgba(0,0,0,.08);--line-deep: rgba(0,0,0,.14);--text: #111;--text-soft: #555;--text-faint: #8a8a8a;--accent: #111;--accent-deep: #000;--shadow: 0 14px 36px rgba(0,0,0,.06);--radius-xl: 24px}*{box-sizing:border-box}html,body{min-height:100%;margin:0;background:radial-gradient(circle at top left,rgba(0,0,0,.06),transparent 22%),radial-gradient(circle at 85% 20%,rgba(0,0,0,.04),transparent 18%),linear-gradient(180deg,#f7f7f7,#f1f1f1);color:var(--text);font-family:PingFang SC,Microsoft YaHei,"Noto Serif 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