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a{font-size:.84rem}.hero-grid{gap:25px}.cards,.lab-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:700px){.container{width:min(var(--max),calc(100% - 28px))}.header-inner{min-height:68px}.menu-toggle{display:block}.nav{display:none;position:absolute;left:0;right:0;top:68px;background:#07142e;padding:18px 20px;border-bottom:1px solid #37517d;flex-direction:column;align-items:stretch;gap:0}.nav.open{display:flex}.nav a{padding:10px}.hero{padding:42px 0}.hero-grid,.grid-2{grid-template-columns:1fr}.hero h1{font-size:2.6rem}.book-image{max-width:250px}.cards,.lab-grid,.chapter-list{grid-template-columns:1fr}.section{padding:42px 0}.page-title{padding:40px 0 18px}.card{min-height:0}}
