:root{--nav:#10213b;--blue:#1677ff;--ink:#14233d;--muted:#687995;--line:#e3eaf4;--bg:#f3f7fc}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:14px/1.45 Inter,Segoe UI,Arial,sans-serif}.topbar{height:66px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 22px;position:sticky;top:0;z-index:5}.brand{display:flex;align-items:center;gap:12px}.brand-icon{background:var(--blue);color:#fff;border-radius:12px;padding:10px 14px;font-size:22px}.brand strong{display:block;font-size:18px}.brand small{color:var(--muted)}.top-note{color:#31517d;background:#eff5ff;border:1px solid #d6e5ff;border-radius:22px;padding:8px 12px;font-size:12px}.sidebar{position:fixed;top:66px;bottom:0;left:0;width:220px;background:linear-gradient(180deg,var(--nav),#0b1a30);padding:20px 12px;color:#dce7f7;overflow:auto}.side-title{font-size:11px;letter-spacing:1.1px;color:#91a6c2;margin:4px 10px 15px}.nav-link,.sub-link{display:block;color:#dce7f7;text-decoration:none;border-radius:8px;padding:12px 13px;margin:4px 0}.nav-link.active{background:var(--blue);color:#fff;font-weight:700}.sub-link{margin-left:13px;padding:9px 12px;font-size:12px;border-left:1px solid #385170;border-radius:0}.active-sub{color:#fff;font-weight:700}.side-help{margin:28px 4px 0;padding:12px;border:1px solid #344965;border-radius:10px;color:#b8c9df;font-size:11px;line-height:1.6}.side-help strong{color:#fff}.main{margin-left:220px;padding:18px;min-height:calc(100vh - 66px)}.page-heading{margin:0 0 14px;font-size:20px}.module-frame{display:block;width:100%;height:calc(100vh - 120px);min-height:760px;border:0;border-radius:12px;background:#fff;box-shadow:0 4px 18px #1d3d6810}.footer{margin-left:220px;padding:12px 20px;color:#73829a;font-size:11px}@media(max-width:720px){.topbar{padding:0 12px}.top-note{display:none}.sidebar{position:static;width:auto;padding:10px;display:flex;flex-wrap:wrap;gap:4px}.side-title,.side-help{display:none}.nav-link,.sub-link{margin:0;padding:10px}.sub-link{border-left:0}.main,.footer{margin-left:0;padding:10px}.module-frame{height:calc(100vh - 180px);min-height:680px}}