:root{--bg: #eef1f6;--bg-soft: #e7ebf2;--surface: #fbfcfe;--ink: #1d2634;--ink-soft: #535f76;--line: #d9dfe9;--accent: #2465ad;--accent-strong: #1d5390;--accent-tint: #e1ecf9;--accent-ink: #173e6b;--radius-card: 16px;--shadow-soft: 0 1px 2px rgba(29, 38, 52, .05), 0 12px 32px rgba(29, 38, 52, .08);--shadow-lift: 0 2px 4px rgba(29, 38, 52, .06), 0 18px 44px rgba(29, 38, 52, .12)}@media(prefers-color-scheme:dark){:root{--bg: #12161d;--bg-soft: #171d26;--surface: #1b222d;--ink: #e7edf6;--ink-soft: #a2aec2;--line: #2b3442;--accent: #6ba6e4;--accent-strong: #8cbdee;--accent-tint: #1d2c40;--accent-ink: #b7d4f2;--shadow-soft: 0 1px 2px rgba(0, 0, 0, .4), 0 12px 32px rgba(0, 0, 0, .35);--shadow-lift: 0 2px 4px rgba(0, 0, 0, .5), 0 18px 44px rgba(0, 0, 0, .45)}}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:system-ui,-apple-system,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Noto Sans SC,sans-serif;color:var(--ink);background:radial-gradient(1200px 500px at 85% 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