:root{--bg:#f4f6f9;--surface:#fff;--soft:#edf1f5;--text:#17212b;--muted:#697684;--line:#dde3e9;--brand:#ef654f;--nav:#111a24}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,"PingFang SC","Microsoft YaHei",sans-serif}.dark{--bg:#0c1219;--surface:#121a24;--soft:#19232e;--text:#edf3f8;--muted:#96a4b2;--line:#26323e;--nav:#080e14}.shell{min-height:100vh;display:grid;grid-template-columns:285px minmax(0,1fr)}.sidebar{height:100vh;position:sticky;top:0;overflow:auto;padding:26px 18px 20px;background:var(--nav);color:#dbe4ed;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:12px;padding:0 8px 25px;color:inherit;text-decoration:none}.brand-mark{width:41px;height:41px;display:grid;place-items:center;border-radius:13px;background:linear-gradient(145deg,#ff7a64,#d94331);font-size:12px;font-weight:900}.brand strong,.brand small{display:block}.brand strong{font-size:16px}.brand 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