.classroom-hub [hidden]{display:none!important}
.classroom-hub{background:#faf7f0;color:#293e50}.hub-header{max-width:1080px;margin:auto;padding:20px 24px;display:flex;justify-content:space-between;align-items:center;gap:16px}.hub-brand{font-size:20px;font-weight:700;text-decoration:none;color:#293e50;min-height:48px;display:flex;flex-direction:column;justify-content:center}.hub-brand small{font-size:12px;letter-spacing:.07em;font-weight:500;color:#5d6d77}.hub-header nav{display:flex;gap:8px}.hub-header nav a{display:flex;align-items:center;justify-content:center;min-width:64px;min-height:48px;background:#fff;border:2px solid #d9ddd9;border-radius:14px;color:#245fa5;font-weight:600;text-decoration:none}.hub-header [hidden]{display:none}.hub-main{max-width:880px;margin:0 auto;padding:24px 24px 48px}.hub-welcome{text-align:center;margin:12px 0 32px}.hub-welcome img{object-fit:contain;mix-blend-mode:multiply}.hub-welcome h1{font-size:34px;line-height:1.3;margin:16px 0 10px}.hub-welcome p,.hub-note,.hub-heading>p{color:#5d6d77}.hub-entries{max-width:640px;margin:auto;display:grid;gap:16px}.hub-entry{display:flex;justify-content:space-between;align-items:center;gap:20px;min-height:112px;padding:22px 26px;border:2px solid #245fa5;border-radius:20px;background:#edf4fc;color:#174b88;text-decoration:none}.hub-entry strong{display:block;font-size:25px;line-height:1.3}.hub-entry small{display:block;font-size:16px;line-height:1.6;margin-top:7px;color:#385b7a}.hub-entry>span:last-child{font-size:28px}.review-entry{background:#edf6f0;border-color:#26705e;color:#205f50}.review-entry small{color:#365f52}.preview-entry{background:#fff;border-color:#8598aa;color:#293e50}.preview-entry small{color:#5d6d77}.hub-entry:hover{border-color:#174b88;background:#e3edf8}.review-entry:hover{background:#e2eee6}.preview-entry:hover{background:#f3f6f8}.hub-note{text-align:center;margin:28px 0;font-size:15px}.hub-heading{margin-bottom:28px}.hub-heading h1{font-size:30px;line-height:1.4;margin:0 0 10px;overflow-wrap:anywhere}.hub-heading p{margin:0}.grade-choices{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.grade-choices a{display:flex;flex-direction:column;justify-content:center;min-height:118px;padding:24px;border:2px solid #d9ddd9;border-radius:16px;background:#fff;text-decoration:none;color:#293e50}.grade-choices strong{font-size:24px}.grade-choices span{color:#5d6d77;margin-top:8px}.unit-choices{display:grid;gap:12px}.unit-choices a{display:flex;align-items:center;gap:20px;padding:20px;border:2px solid #d9ddd9;border-radius:16px;background:#fff;color:#293e50;text-decoration:none}.unit-choices a>span:nth-child(2){flex:1;min-width:0}.unit-choices strong,.unit-choices small{display:block;overflow-wrap:anywhere}.unit-choices strong{font-size:20px}.unit-choices small{font-size:15px;line-height:1.6;color:#5d6d77;margin-top:6px}.unit-label{color:#245fa5;font-weight:700;white-space:nowrap}.hub-source{font-size:14px;color:#5d6d77;line-height:1.8;margin-top:28px}.hub-status{max-width:832px;margin:0 auto;padding:0 24px;color:#a73525}.hub-status:empty{display:none}.hub-audio{margin-bottom:12px;border-bottom:1px solid #d9ddd9;padding-bottom:12px}.hub-audio summary{min-height:48px;display:flex;align-items:center;cursor:pointer;font-weight:600;color:#245fa5}.hub-audio label{display:inline-flex;align-items:center;flex-wrap:wrap;gap:8px;margin:8px 16px 8px 0}.hub-audio select{min-height:48px}.hub-audio p{font-size:14px;color:#5d6d77}.study-jumps{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0 28px}.study-jumps button{min-height:48px;padding:8px 18px;border:2px solid #d9ddd9;border-radius:12px;color:#245fa5;background:#fff;font:inherit;font-weight:600}.study-section{margin:36px 0;scroll-margin-top:20px}.study-section>h2{font-size:23px;line-height:1.5;margin-bottom:16px}.study-words{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.study-word{border:2px solid #d9ddd9;background:#fff;border-radius:16px;padding:18px;overflow-wrap:anywhere}.study-word-top{display:flex;align-items:start;justify-content:space-between;gap:12px}.study-word h3{font-size:23px;line-height:1.5;margin:0}.study-ipa{color:#5d6d77;margin:4px 0 10px}.study-word p{line-height:1.65}.hub-speak{min-width:64px;flex-shrink:0;padding:8px 12px;min-height:48px}.study-check{display:flex;align-items:center;gap:12px;min-height:48px;cursor:pointer;line-height:1.7}.study-check input{width:22px;height:22px;flex-shrink:0;accent-color:#245fa5}.study-check:has(input:checked){color:#26705e}.study-pairs>article{display:flex;align-items:start;justify-content:space-between;gap:20px;padding:20px 0;border-bottom:1px solid #d9ddd9}.study-pairs p{margin:0 0 8px;line-height:1.7}.pair-en{font-size:21px}.study-points{padding-left:24px;line-height:1.9}.study-points li{padding:8px 0}.study-reveal{margin:12px 0;background:#fff;border:2px solid #d9ddd9;border-radius:16px;padding:4px 18px}.study-reveal summary{min-height:64px;padding:14px 0;cursor:pointer;line-height:1.7}.study-reveal summary small{display:block;color:#5d6d77}.study-reveal>div{padding:0 0 18px}.study-reveal p[lang=en]{font-size:21px}.study-question{padding:22px 0;border-bottom:1px solid #d9ddd9}.study-question h3{font-size:18px;line-height:1.8}.study-options{display:grid;gap:10px}.study-options button{min-height:52px;padding:12px 16px;background:#fff;border:2px solid #d9ddd9;border-radius:12px;color:#293e50;text-align:left;font:inherit;line-height:1.6;overflow-wrap:anywhere}.study-options button.selected{border-color:#245fa5;background:#edf4fc}.study-options button:disabled{opacity:1;cursor:default}.answer-feedback{line-height:1.8;background:#edf6f0;padding:16px;border-radius:12px}.passage-text{line-height:2.4;white-space:pre-line}.passage-blank{display:inline-flex;flex-wrap:wrap;align-items:center;gap:6px;max-width:100%;margin:4px}.passage-blank span{font-size:14px;color:#5d6d77}.passage-blank select{max-width:100%;min-height:48px;white-space:normal}.study-tasks .study-check{padding:12px 0;border-bottom:1px solid #d9ddd9}.hub-finish{padding:28px 0;border-top:2px solid #d9ddd9}.hub-finish p{color:#5d6d77;line-height:1.7}.classroom-hub :focus-visible{outline:3px solid #245fa5;outline-offset:4px}.classroom-hub h1:focus,.classroom-hub h2:focus{outline:none}.classroom-hub ::selection{background:#d8e7f5;color:#293e50}
@media(max-width:600px){.hub-header{padding:12px 16px}.hub-main{padding:12px 16px 32px}.hub-brand{font-size:18px}.hub-brand small{font-size:11px}.hub-welcome{margin:8px 0 24px}.hub-welcome img{width:80px;height:80px}.hub-welcome h1{font-size:28px}.hub-entry{padding:18px;min-height:112px;border-radius:16px}.hub-entry strong{font-size:23px}.hub-entry small{font-size:15px}.hub-heading h1{font-size:26px}.unit-choices a{gap:12px;padding:16px}.unit-choices strong{font-size:18px}.unit-choices a>span:last-child{font-size:14px}.study-words{grid-template-columns:1fr}.study-pairs>article{gap:12px}.pair-en{font-size:19px}.study-word h3{font-size:22px}.study-word-top{align-items:center}.grade-choices a{padding:18px}.grade-choices strong{font-size:22px}}

.entry-arrow{flex-shrink:0}.hub-example{font-size:14px;line-height:1.7;color:#5d6d77;margin:10px 0 20px}