/* Shared navigation and assistance for the English edition. */
.en-learning-nav{display:flex;flex-direction:column;gap:8px;margin:0 0 24px;font:14px/1.5 Arial,sans-serif}.en-learning-nav>a{display:block;border:1px solid #b8d3cf;border-radius:7px;background:white;color:#12665a;padding:12px;text-decoration:none;font-weight:bold;min-height:20px}.en-learning-nav>a:hover{background:#e9f5ef}.en-region-picker{border:1px solid #d6e3de;border-radius:7px;padding:12px;margin:2px 0;background:#f6faf8;min-width:0}.en-region-picker legend{font-weight:bold;padding:0 4px}.en-region-picker label{display:block;font-size:14px;margin:7px 0}.en-region-picker select{box-sizing:border-box;display:block;width:100%;max-width:100%;min-height:42px;padding:8px;background:#fff;border:1px solid #bdd3cc;border-radius:5px;font:14px Arial,sans-serif}.en-region-picker p{font-size:12px;line-height:1.6;color:#4e6961;margin:12px 0 0}.en-help-footer{display:flex;justify-content:center;flex-wrap:wrap;gap:12px 20px;padding:24px 16px;border-top:1px solid #d5e1e5;font:14px/1.6 Arial,sans-serif}.en-help-footer a{color:#12665a}.us-grades{display:flex;flex-wrap:wrap;gap:5px;margin:14px 0}.us-grades button,.us-profile{border:1px solid #b8d3cf;border-radius:6px;padding:10px;background:white;color:#24594e;font:14px Arial,sans-serif;cursor:pointer}.us-grades [aria-pressed=true],.us-profile[aria-pressed=true]{background:#e2f1eb;border-color:#17765f}.us-profile{display:block;width:100%;text-align:left;margin:8px 0;line-height:1.5}.region-layout{display:grid;grid-template-columns:280px 1fr;gap:28px}.en-help-steps li{margin:24px 0}.en-support{display:flex;flex-wrap:wrap;align-items:center;gap:12px;font:14px/1.6 Arial,sans-serif;margin:12px 0}.en-support a{color:#12665a}.en-support button{font:inherit;color:#12665a;background:white;border:1px solid #b8d3cf;padding:10px;border-radius:6px;cursor:pointer}.en-report{box-sizing:border-box;width:min(620px,calc(100% - 24px));max-height:85vh;overflow:auto;padding:24px;border:1px solid #bdd3cc;border-radius:12px;font:16px/1.7 Arial,sans-serif;color:#243d51}.en-report::backdrop{background:#0007}.en-report textarea{box-sizing:border-box;width:100%;min-height:240px;font:14px/1.6 Arial,sans-serif;padding:10px}
@media screen{body :is(.ad-banner,.ad,.right-ad,.ad-slot):not(:has(iframe,ins,img)){display:none!important}main.layout:has(>.right-ad:not(:has(iframe,ins,img))){grid-template-columns:300px minmax(0,1fr)!important;max-width:1400px!important;margin-top:24px}body:has(.en-learning-nav) .arithmetic-back{display:none}.en-learning-nav :focus-visible{outline:3px solid #d69927;outline-offset:3px}}
@media(max-width:760px){.region-layout{display:block}main.layout:has(>.right-ad:not(:has(iframe,ins,img))){display:block!important}.en-learning-nav select,.us-grades button{min-height:44px}}
@media print{.en-learning-nav,.en-help-footer,.en-support,.en-report{display:none!important}}

/* Match the Korean topic chooser: grouped practices, counts and examples. */
.groups .practice-count{float:right;font-size:14px;font-weight:700;margin-left:12px}.groups .drill-example{display:block;font-size:15px;line-height:1.6;overflow-wrap:anywhere}.groups .drill-description{display:block;margin-top:5px;color:#52675f;font-size:13px;line-height:1.5}.groups details{margin:10px 0}.groups summary{cursor:pointer;background:#e6efeb;border-radius:8px;padding:14px;font-weight:700}.groups summary:focus-visible{outline:3px solid #d69927;outline-offset:2px}