:root{--atlas-bg:#070d1a;--atlas-surface:#0e1729;--atlas-line:#22304a;--atlas-text:#edf3ff;--atlas-muted:#98a6bf;--atlas-cyan:#57d9ee}
.atlas-topbar{position:sticky;top:0;z-index:1000;height:68px;border-bottom:1px solid rgba(132,151,184,.18);background:rgba(7,13,26,.92);backdrop-filter:blur(18px);color:var(--atlas-text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif}
.atlas-topbar-inner{width:min(1120px,calc(100% - 32px));height:100%;margin:auto;display:grid;grid-template-columns:auto minmax(220px,1fr) auto auto auto auto;align-items:center;gap:10px}
.atlas-brand{display:flex;align-items:center;gap:10px;color:var(--atlas-text)!important;text-decoration:none!important;font-weight:800;white-space:nowrap}
.atlas-brand-mark{display:grid;place-items:center;width:38px;height:38px;border:1px solid #36758b;border-radius:11px;background:#0d1a2b;color:var(--atlas-cyan);font:800 20px/1 ui-monospace,monospace}
.atlas-search{width:100%;max-width:520px;justify-self:center}.atlas-search input{width:100%;height:40px;border:1px solid var(--atlas-line);border-radius:11px;background:#10192b;color:var(--atlas-text);padding:0 14px;outline:none;font:inherit}.atlas-search input:focus{border-color:#3f7891;box-shadow:0 0 0 3px rgba(87,217,238,.08)}
.atlas-tool{height:40px;display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:0 13px;border:1px solid var(--atlas-line);border-radius:10px;background:#10192b;color:var(--atlas-text);cursor:pointer;font:650 12px/1 Inter,system-ui,sans-serif;text-decoration:none}.atlas-tool:hover{border-color:#3f7891}.atlas-tool-icon{color:var(--atlas-cyan);font:800 14px/1 ui-monospace,monospace}.atlas-ai{border-color:rgba(87,217,238,.52);background:linear-gradient(135deg,#15384a,#164158);color:#eaffff}.atlas-profile{color:var(--atlas-cyan)}.atlas-profile.is-signed-in{border-color:rgba(81,227,164,.45);color:#7ee0a8}
.atlas-ai-panel,.math-ai-panel,.ai-panel{position:fixed;z-index:1100;top:68px;right:0;bottom:0;width:min(390px,100%);display:flex;flex-direction:column;border-left:1px solid var(--atlas-line);background:rgba(7,13,26,.985);box-shadow:-24px 0 60px rgba(0,0,0,.3);transform:translateX(105%);transition:transform .22s ease}.atlas-ai-panel.open,.math-ai-panel.open,.ai-panel.open,.ai-panel.is-open{transform:translateX(0)}
body.has-course-topbar{padding-top:0!important}.course-topbar{display:none!important}
@media(max-width:760px){.atlas-topbar{height:62px}.atlas-topbar-inner{width:calc(100% - 14px);grid-template-columns:42px minmax(72px,1fr) 42px 42px 42px 42px;gap:5px}.atlas-brand-name,.atlas-tool-label{display:none}.atlas-brand-mark{width:40px;height:40px}.atlas-search input{height:40px;padding:0 9px;font-size:13px}.atlas-tool{width:100%;height:40px;padding:0 5px}.atlas-tool-icon{font-size:16px}.atlas-pricing-link{display:inline-flex;font-size:0}.atlas-pricing-link::before{content:"$";font-size:16px;color:var(--atlas-cyan);font-weight:800}}