.math-keypad{margin-top:14px;border:1px solid var(--line);border-radius:17px;background:var(--paper-soft);padding:12px}.math-keypad-label{margin:0 0 9px;color:var(--muted);font-size:12px;font-weight:800;letter-spacing:.08em}.math-keys{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:7px}.math-key{min-height:42px;border:1px solid var(--line);border-radius:11px;background:var(--paper);color:var(--ink);font-size:16px;font-weight:800;box-shadow:0 2px 0 color-mix(in srgb,var(--ink) 7%,transparent)}.math-key:active{transform:translateY(1px);box-shadow:none}.math-key.action{color:var(--brand-deep);background:color-mix(in srgb,var(--brand) 8%,var(--paper))}.math-key.clear{color:var(--coral)}@media(max-width:720px){.math-keypad{padding:10px}.math-key{min-height:39px;font-size:15px}}