.practice-section{color:#1b3543;background:#f1f6f7;scroll-margin-top:100px}.practice-heading{max-width:760px;margin-bottom:36px}.practice-heading h2{margin:12px 0 20px}.practice-heading p{font-size:16px;line-height:1.9}.practice-layout{grid-template-columns:minmax(180px,240px) minmax(0,1fr);align-items:start;gap:32px;display:grid}.practice-nav{gap:12px;display:grid}.practice-nav button{text-align:left;color:inherit;font:inherit;cursor:pointer;background:#fff;border:1px solid #bccdd1;border-radius:6px;grid-template-columns:28px 1fr;gap:6px 12px;padding:18px;display:grid}.practice-nav button[aria-current]{background:#e4f1ee;border-color:#12635e;box-shadow:inset 3px 0 #12635e}.practice-nav span{grid-row:span 2;font-size:14px;font-weight:600}.practice-nav b{font-size:16px;font-weight:600;line-height:1.5}.practice-nav small{color:#526975;font-size:14px}.practice-card{background:#fff;border:1px solid #ccdadd;border-radius:10px;min-width:0;padding:40px}.practice-meta{color:#526975;flex-wrap:wrap;justify-content:space-between;gap:16px;margin-bottom:28px;font-size:14px;display:flex}.practice-card fieldset{border:0;min-width:0;margin:0;padding:0}.practice-card legend{color:#182f3c;width:100%;margin-bottom:28px;padding:0;font-size:21px;font-weight:600;line-height:1.65;display:block}.practice-context{white-space:pre-line;background:#f4f7f8;margin:0 0 28px;padding:22px;font-size:17px;line-height:1.9}.practice-options{gap:14px;display:grid}.practice-options label{cursor:pointer;overflow-wrap:anywhere;border:1px solid #bccbd0;border-radius:6px;align-items:baseline;gap:14px;padding:18px 20px;font-size:17px;line-height:1.65;display:flex}.practice-options label.is-selected{background:#f0f8f6;border-color:#1b6c67}.practice-options label.is-correct{background:#e9f5ee;border:2px solid #1b6c67}.practice-options label.is-incorrect{background:#fff4ee;border-color:#a8543d}.practice-options input{accent-color:#18635e;flex-shrink:0;width:17px;height:17px}.practice-options small{flex-shrink:0;margin-left:auto;font-size:14px}.practice-letter{font-weight:600}.practice-actions{flex-wrap:wrap;align-items:center;gap:20px;margin-top:30px;display:flex}.practice-actions>span{color:#526975;font-size:14px}.practice-submit{color:#fff;font:inherit;cursor:pointer;background:#195e5c;border:0;border-radius:5px;min-height:48px;padding:15px 26px;font-weight:600}.practice-section button:disabled{opacity:.5;cursor:default}.practice-section :focus-visible{outline-offset:4px;outline:3px solid #ba7630}.practice-explanation{border-top:1px solid #ccdadd;margin-top:32px;padding-top:30px}.practice-result{color:#155753;margin-bottom:16px;font-size:15px;font-weight:600;display:inline-block}.practice-explanation h3{margin:4px 0 16px;font-size:20px}.practice-explanation h4{margin:28px 0 12px;font-size:16px}.practice-explanation p{margin:0 0 20px;font-size:16px;line-height:2}.practice-takeaway{border-left:3px solid #9cbabb;padding-left:18px}.practice-explanation details{margin-top:24px;font-size:15px;line-height:1.9}.practice-explanation summary{cursor:pointer}.practice-explanation a{color:#12605d;text-underline-offset:4px;text-decoration:underline}.practice-paging{border-top:1px solid #dce5e8;justify-content:space-between;align-items:center;gap:16px;margin-top:32px;padding-top:24px;display:flex}.practice-paging button{font:inherit;min-height:44px;color:inherit;cursor:pointer;background:#fff;border:1px solid #c4d3d7;border-radius:4px;padding:12px 16px;font-size:15px}.practice-paging>span{font-size:14px}.practice-note{color:#526975;margin-top:26px!important;font-size:14px!important;line-height:1.9!important}.practice-card fieldset:disabled label{cursor:default}@media (max-width:760px){.practice-layout{grid-template-columns:1fr;gap:22px}.practice-nav{grid-template-columns:repeat(2,minmax(0,1fr))}.practice-nav button{gap:6px;padding:14px}.practice-nav b{font-size:15px}.practice-card{padding:26px 20px}.practice-card legend{font-size:19px}.practice-options label{flex-wrap:wrap;gap:10px;padding:16px 12px;font-size:16px}.practice-options label>span[lang]{flex:1;min-width:120px}.practice-options small{width:100%;margin-left:50px}.practice-heading{margin-bottom:26px}}@media (prefers-reduced-motion:reduce){.practice-section *{scroll-behavior:auto}}.practice-nav b .practice-topic-en{overflow-wrap:anywhere;grid-row:auto;margin-top:8px;font-size:14px;font-weight:400;line-height:1.65;display:block}.practice-language-block+.practice-language-block{border-top:1px solid #dce5e8;margin-top:28px;padding-top:26px}.practice-explanation .practice-language-block[lang=en] p{line-height:1.85}
.practice-reference{max-width:1100px}.practice-reference>p{max-width:760px}.reference-question{border-top:1px solid #d7e1e9;margin:0;padding:0}.reference-question:last-child{border-bottom:1px solid #d7e1e9}.reference-question summary{cursor:pointer;padding:22px 12px;font-weight:700;line-height:1.7}.reference-question summary:hover{background:#f3f7fa}.reference-question summary:focus-visible{outline-offset:2px;outline:3px solid #0873ce}.reference-body{overflow-wrap:anywhere;max-width:900px;padding:0 18px 28px}.reference-body h3{margin:24px 0 12px;font-size:1.12rem;line-height:1.75}.reference-body h4{margin:24px 0 8px}.reference-body p,.reference-body li,.reference-body dd{line-height:1.9}.reference-body dd{margin:8px 0 24px}.reference-body a{text-underline-offset:3px;text-decoration:underline}.reference-body ol,.reference-body ul{padding-left:28px}@media (max-width:600px){.reference-question summary{padding:18px 6px}.reference-body{padding:0 6px 24px}}