:root{--side:#171b26;--side2:#202534;--bg:#f4f6fa;--card:#fff;--text:#202636;--muted:#7b8497;--line:#e9ecf2;--primary:#635bdf;--primary2:#8179ef;--shadow:0 9px 28px rgba(31,42,68,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:78px}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,"PingFang SC","Microsoft YaHei",sans-serif}body.dark{--bg:#0f1219;--card:#191e29;--text:#edf0f7;--muted:#929caf;--line:#292f3c;--shadow:0 9px 28px rgba(0,0,0,.25)}button,input{font:inherit}#sidebar{position:fixed;left:0;top:0;bottom:0;width:222px;background:linear-gradient(180deg,var(--side),#12151e);color:#d9deea;z-index:50;display:flex;flex-direction:column;box-shadow:4px 0 24px rgba(0,0,0,.12)}.side-brand{height:70px;padding:0 20px;display:flex;align-items:center;gap:12px;text-decoration:none;color:#fff;border-bottom:1px solid 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