:root{--ink:#10213c;--muted:#6d7a8d;--soft:#8d99ab;--line:#e5eaf1;--bg:#f6f8fc;--panel:#fff;--blue:#2f62e9;--deep:#244ebc;--pale:#eaf0ff;--green:#188063;--green-pale:#e4f6ef;--amber:#af721c;--amber-pale:#fff4e2;--shadow:0 18px 45px rgba(24,51,91,.05);--radius:18px}
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var(--line);display:flex;flex-direction:column}.brand{display:flex;gap:12px;align-items:center;padding:0 12px 42px}.brand-logo{display:grid;place-items:center;color:#fff;background:var(--ink);height:40px;width:40px;border-radius:13px;font:700 26px/1 Georgia,serif;box-shadow:0 7px 12px #10213c24;flex:none}.brand-copy{display:flex;flex-direction:column;line-height:1.2}.brand-copy strong{font-size:25px;letter-spacing:-.05em}.brand-copy small{font-size:12px;color:var(--muted);margin-top:5px}.side-kicker{margin:0 13px 15px;font-size:11px;letter-spacing:.13em;color:#99a4b3;font-weight:800}.desktop-nav{display:flex;flex-direction:column;gap:5px}.nav-link{display:flex;align-items:center;gap:13px;padding:12px 14px;border-radius:12px;font-weight:650;color:#6c788b;transition:.15s}.nav-link svg{height:19px;width:19px;stroke-width:1.9}.nav-link:hover{background:#f6f8ff;color:var(--ink)}.nav-link.active{background:var(--pale);color:var(--blue)}.side-foot{margin-top:auto;padding:20px 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@media(max-width:1050px){.sidebar{width:220px;flex-basis:220px;padding-left:14px;padding-right:14px}.content{padding-left:30px;padding-right:30px}}
@media(max-width:760px){body{font-size:14px}.sidebar{display:none}.main-column{width:100%}.topbar{height:65px;padding:0 20px;justify-content:space-between}.mobile-brand{display:flex;gap:9px;align-items:center;font-size:21px;letter-spacing:-.05em}.mobile-brand .brand-logo{height:33px;width:33px;font-size:22px;border-radius:11px}.topbar-caption{display:none}.content{padding:23px 18px 116px;min-height:calc(100vh - 60px)}.page-footer{padding:0 20px 112px}.mobile-nav{display:flex;position:fixed;z-index:90;bottom:0;left:0;right:0;background:#fff;box-shadow:0 -5px 24px #13234216;border-top:1px solid var(--line);padding:8px 3px calc(8px + env(safe-area-inset-bottom));justify-content:space-around}.mobile-nav a{display:flex;flex-direction:column;gap:2px;align-items:center;justify-content:center;color:#8a96a9;font-size:10px;font-weight:750;padding:5px 7px;border-radius:9px;min-width:52px}.mobile-nav a svg{height:19px;width:19px}.mobile-nav a.active{color:var(--blue)}.mobile-only{display:block}.intro{margin-bottom:20px}.intro h1{font-size:30px}.hero{padding:24px 23px;min-height:230px}.hero h2{font-size:26px}.hero p{font-size:13px}.stats{gap:9px}.stat{padding:14px 12px}.stat strong{font-size:23px}.stat span{font-size:11px}.grid-3{grid-template-columns:1fr}.grid-2{grid-template-columns:1fr;gap:11px}.section-head{margin:23px 0 12px}.section-head h2{font-size:18px}.panel.pad{padding:19px}.subject-card{padding:15px}.lesson-item{padding:15px}.flash-card{min-height:255px;padding:23px 17px}.flash-card .prompt{font-size:22px}.grade-grid{gap:6px}.grade-btn{font-size:11px;padding:10px 3px}.article-section p{font-size:14px}.metric-row label{width:120px}.connection-pill{font-size:10px}}
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