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var(--rule-2);border-top-color:var(--ink);border-radius:50%;width:12px;height:12px;animation:.7s linear infinite spin;display:inline-block}@keyframes spin{to{transform:rotate(360deg)}}.pdf-scroll.capturing{touch-action:none;cursor:crosshair}.pdf-scroll.capturing .react-pdf__Page__textContent{pointer-events:none}.popover.sheet{top:auto;left:0;right:0;bottom:calc(var(--mobile-nav) + env(safe-area-inset-bottom));border-radius:12px 12px 0 0;justify-content:center;max-width:none;padding:10px 10px 12px;animation:.15s ease-out sheet;position:fixed;box-shadow:0 -6px 24px #1b1f2a2e}@keyframes sheet{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}.popover.sheet .btn{padding:8px 12px;font-size:14px}@media (max-width:700px){:root{--topbar:46px;--mobile-nav:56px}body{font-size:15px}.btn{padding:7px 12px;font-size:14px}.btn.small{padding:5px 10px;font-size:13px}.input,.textarea,.select{padding:9px 10px;font-size:16px}.reader.mobile{grid-template-rows:var(--topbar) 1fr 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button.active{color:var(--ink);border-top-color:var(--marker);background:var(--marker-soft)}.mobile-nav button .spinner{position:absolute;top:6px;right:12px}.pdf-toolbar{gap:4px;padding:6px;overflow-x:auto}.pdf-scroll{padding:8px 0 40vh}.pdf-page-wrap{margin-bottom:8px}.pdf-page-wrap .page-num{top:4px;right:4px}.pdf-hint{text-align:center;max-width:92vw;font-size:12px;bottom:12px}.find-results{width:auto;left:8px;right:8px}.pane{padding:12px 12px 40px}.pane-head{gap:8px}.level input[type=range]{width:90px}.section-card{padding:12px 12px 12px 16px}.section-card.sub{margin-left:8px}.section-card .head h3{font-size:15px}.prose{font-size:15px;line-height:1.6}.lens-card,.study-block,.chat-log{padding:12px}.msg{max-width:96%}.chat-input{padding:8px}.drawer{width:100vw;padding:16px}.library{padding:28px 16px 60px}.library h1{font-size:28px}.paper-row{grid-template-columns:1fr;gap:6px}.paper-row .btn{justify-self:start}.glossary dl{grid-template-columns:1fr;gap:2px 0}.glossary dd{margin-bottom:8px}.prereq{grid-template-columns:1fr}.prose table{display:block;overflow-x:auto}}