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(width<=560px){.footer-right{align-items:flex-start}.brand{font-size:1.05rem}nav a{padding:8px 6px}.hero-art{opacity:.16;width:100%}.art-dot{pointer-events:none}.hero-inner{padding-top:48px;padding-bottom:56px}}dialog{border:1.5px solid var(--box-line);background:var(--card);width:min(26rem,100% - 32px);color:var(--ink);box-shadow:var(--shadow-lift);border-radius:10px;padding:0}dialog::backdrop{background:#0a140c73}#login-form{padding:22px}#login-form h2{color:var(--green);margin:0 0 14px;font-weight:400}#login-form label{margin-bottom:6px;font-weight:600;display:block}#login-form input{border:1.5px solid var(--box-line);background:var(--bg);width:100%;color:var(--ink);font:inherit;border-radius:6px;padding:10px 12px}.login-message{min-height:1.5em;color:var(--maroon);margin:8px 0 0}.dialog-actions{justify-content:flex-end;gap:10px;margin-top:10px;display:flex}.button:focus-visible,.chip:focus-visible,.card-link:focus-visible,.copy-link:focus-visible,.door:focus-visible,.link-button:focus-visible,#login-form input:focus-visible{outline:3px solid var(--maroon);outline-offset:3px}@media (hover:hover){nav a:hover,.theme-toggle:hover{background:#ffffff24}.button:hover{filter:brightness(1.1)}.door:hover{box-shadow:var(--shadow-lift);transform:translateY(-4px)}.card:hover{transform:translateY(-4px)}.card:hover .card-link{box-shadow:var(--shadow-lift)}.copy-link:hover{background:var(--box)}.card-link:hover .card-open{text-underline-offset:3px;text-decoration:underline}}.sr-only{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.nf-problem{border:1.5px solid var(--box-line);background:var(--box);border-radius:10px;max-width:34rem;padding:24px 28px}.nf-math{font-family:var(--serif);flex-wrap:wrap;align-items:baseline;gap:0 16px;margin:0;font-size:clamp(2.2rem,8vw,3.4rem);line-height:1.2;display:flex}.nf-answer{color:var(--maroon);font-style:italic}.nf-note{color:var(--muted);margin:12px 0 0}.nf-actions{flex-wrap:wrap;gap:12px;margin:28px 0 0;display:flex}