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10px}@media(max-width:1100px){.shell{grid-template-columns:minmax(0,1fr)}.topbar{display:flex;position:sticky;top:0;z-index:20;align-items:center;justify-content:space-between;padding:10px 16px;background:color-mix(in srgb,var(--bg) 88%,transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}.topbar .brand-name{font-size:17px}.menu-btn{border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:6px 14px;font-weight:650;font-size:14px;cursor:pointer}.rail{position:fixed;top:53px;left:0;bottom:0;height:auto;width:min(320px,88vw);z-index:19;background:var(--bg);transform:translate(-102%);transition:transform .3s cubic-bezier(.2,.7,.2,1);box-shadow:var(--shadow)}.rail.is-open{transform:none}.brand--rail{display:none}main{padding-top:28px}}@media(max-width:760px){main{padding:22px 16px 72px}.hero-body,.closing,.lab,.quiz-body,.diagram{grid-template-columns:minmax(0,1fr)}.lab-stage{border-right:0;border-bottom:1px solid var(--line)}.facts{grid-template-columns:1fr 1fr}.facts div:nth-child(3){grid-column:1 / -1;border-left:0;padding-left:0;border-top:1px solid var(--line)}.p-title{font-size:clamp(44px,13vw,64px)}.p-glyph{--gs: 88px}.quiz-opts{grid-template-columns:minmax(0,1fr)}.quiz-glyph{min-height:220px}.quiz-glyph svg{height:170px}.pager-link span{font-size:19px}}