:root{--ls-navy:#08234d;--ls-blue:#145cc4;--ls-sky:#eaf3ff;--ls-gold:#e0a126;--ls-ink:#13294b;--ls-muted:#66758d;--ls-line:#d8e2ef;--ls-bg:#f3f7fc;--ls-white:#fff;--ls-green:#16865d;--ls-red:#c44949;--ls-shadow:0 18px 48px rgba(8,35,77,.1)}
*{box-sizing:border-box}body.learning-body{margin:0;background:var(--ls-bg);color:var(--ls-ink);font-family:Inter,"Noto Sans SC","Microsoft YaHei",sans-serif}.ls-header{min-height:74px;padding:14px clamp(18px,5vw,72px);display:flex;align-items:center;justify-content:space-between;gap:24px;background:#fff;border-bottom:1px solid var(--ls-line);position:sticky;top:0;z-index:20}.ls-brand{text-decoration:none;color:var(--ls-navy);display:flex;flex-direction:column}.ls-brand span{font-size:10px;letter-spacing:.18em;color:var(--ls-gold);font-weight:850}.ls-brand strong{font-size:20px}.ls-header nav{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}.ls-header nav a,.ls-tab{border:0;background:transparent;color:#4a5c78;text-decoration:none;font-weight:720;cursor:pointer;font:inherit}.ls-header nav a[aria-current],.ls-tab.is-active{color:var(--ls-blue)}.ls-shell{width:min(1500px,calc(100% - 34px));margin:auto;padding:34px 0 70px}.ls-gate{padding:72px 24px;text-align:center;background:#fff;border:1px solid var(--ls-line);border-radius:24px}.ls-eyebrow{margin:0 0 7px;color:var(--ls-gold);font-size:11px;font-weight:850;letter-spacing:.14em;text-transform:uppercase}.ls-hero{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:24px}.ls-hero h1{margin:0;color:var(--ls-navy);font-size:clamp(34px,4vw,58px);line-height:1.05}.ls-hero p{max-width:760px;margin:10px 0 0;color:var(--ls-muted);line-height:1.7}.ls-actions{display:flex;gap:9px;flex-wrap:wrap}.ls-button{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:10px 15px;border:1px solid var(--ls-blue);border-radius:11px;background:var(--ls-blue);color:#fff;text-decoration:none;font-weight:780;cursor:pointer}.ls-button:hover{filter:brightness(.96)}.ls-button:disabled{cursor:not-allowed;opacity:.55}.ls-button.is-secondary{background:#fff;color:var(--ls-blue)}.ls-button.is-quiet{border-color:var(--ls-line);background:#f6f9fd;color:var(--ls-ink)}.ls-button.is-danger{border-color:#f1c6c6;background:#fff1f1;color:#a63131}.ls-tabs{display:flex;gap:8px;margin:0 0 18px;padding:6px;background:#e8eef7;border-radius:14px;overflow:auto}.ls-tab{white-space:nowrap;padding:10px 15px;border-radius:10px}.ls-tab.is-active{background:#fff;box-shadow:0 4px 14px #0b2c5b15}.ls-view[hidden]{display:none}.ls-grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:18px}.ls-card{background:#fff;border:1px solid var(--ls-line);border-radius:20px;box-shadow:0 6px 22px rgba(8,35,77,.045)}.ls-card-head{padding:20px 22px 14px;display:flex;align-items:flex-start;justify-content:space-between;gap:18px}.ls-card-head h2,.ls-card-head h3{margin:0;color:var(--ls-navy)}.ls-card-head p{margin:6px 0 0;color:var(--ls-muted);font-size:13px}.ls-card-body{padding:0 22px 22px}.ls-stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.ls-stat{padding:20px;background:#fff;border:1px solid var(--ls-line);border-radius:18px}.ls-stat span,.ls-stat small{display:block;color:var(--ls-muted)}.ls-stat strong{display:block;margin:4px 0;color:var(--ls-navy);font-size:30px}.ls-sidebar{grid-column:span 4}.ls-main{grid-column:span 8}.ls-full{grid-column:1/-1}.ls-list{display:grid;gap:10px}.ls-list-item{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:15px;border:1px solid var(--ls-line);border-radius:14px;background:#fff;color:inherit;text-align:left}.ls-list-item.is-clickable{cursor:pointer}.ls-list-item.is-clickable:hover,.ls-list-item.is-active{border-color:var(--ls-blue);background:#f3f8ff}.ls-list-item strong,.ls-list-item span,.ls-list-item small{display:block}.ls-list-item span,.ls-list-item small{margin-top:3px;color:var(--ls-muted)}.ls-badge{display:inline-flex!important;width:max-content;margin:0!important;padding:5px 8px;border-radius:999px;background:var(--ls-sky);color:var(--ls-blue)!important;font-size:11px;font-weight:800}.ls-badge.is-green{background:#e9f8f1;color:var(--ls-green)!important}.ls-badge.is-red{background:#fff0f0;color:var(--ls-red)!important}.ls-empty{padding:44px 20px;border:1px dashed #bdcadb;border-radius:16px;color:var(--ls-muted);text-align:center}.ls-form{display:grid;gap:14px}.ls-field span{display:block;margin-bottom:6px;font-size:12px;font-weight:780;color:#425675}.ls-field input,.ls-field select,.ls-field textarea{width:100%;border:1px solid #c6d3e3;border-radius:11px;background:#fff;color:var(--ls-ink);font:inherit;padding:11px 12px}.ls-field textarea{min-height:110px;resize:vertical;line-height:1.6}.ls-field-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.ls-filter{display:grid;grid-template-columns:repeat(5,minmax(120px,1fr));gap:10px;padding:16px;background:#fff;border:1px solid var(--ls-line);border-radius:16px;margin-bottom:14px}.ls-filter input,.ls-filter select{width:100%;height:42px;border:1px solid #c6d3e3;border-radius:10px;padding:0 10px;background:#fff}.ls-question-layout{display:grid;grid-template-columns:minmax(0,1fr) 350px;gap:18px;align-items:start}.ls-question-list{display:grid;gap:10px}.ls-question-card{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:13px;align-items:flex-start;padding:16px;background:#fff;border:1px solid var(--ls-line);border-radius:15px}.ls-question-card input{width:19px;height:19px;accent-color:var(--ls-blue)}.ls-question-card h3{margin:0;font-size:16px}.ls-question-card p{margin:7px 0 0;color:var(--ls-muted);line-height:1.55;font-size:13px}.ls-question-card code{font:700 11px/1.4 ui-monospace,SFMono-Regular,Consolas,monospace;color:#52647f}.ls-question-card .ls-meta{display:flex;gap:6px;flex-wrap:wrap;margin-top:9px}.ls-builder{position:sticky;top:96px}.ls-selected{display:grid;gap:7px;margin:10px 0 16px;max-height:380px;overflow:auto}.ls-selected div{padding:10px;background:#f3f7fc;border-radius:10px;font-size:12px}.ls-selected button{float:right;border:0;background:transparent;color:var(--ls-red);cursor:pointer}.ls-message{min-height:20px;margin:8px 0 0;color:var(--ls-muted);font-size:13px}.ls-message.is-error{color:var(--ls-red)}.ls-message.is-success{color:var(--ls-green)}.ls-review-card{padding:20px}.ls-review-card h3{margin:0;color:var(--ls-navy)}.ls-review-question{margin:12px 0;padding:15px;background:#f4f7fb;border-radius:12px;line-height:1.65}.ls-answer{padding:15px;background:#fff;border:1px solid var(--ls-line);border-radius:12px;white-space:pre-wrap;line-height:1.65}.ls-feedback-grid{display:grid;grid-template-columns:120px 1fr 150px;gap:10px;margin-top:14px}.ls-feedback-grid textarea{grid-column:1/-1}.ls-insight-bars{display:grid;gap:12px}.ls-insight-row{display:grid;grid-template-columns:110px minmax(0,1fr) 70px;align-items:center;gap:10px}.ls-track{height:10px;background:#e6edf6;border-radius:999px;overflow:hidden}.ls-track span{display:block;height:100%;background:var(--ls-blue);border-radius:inherit}.ls-toast{position:fixed;right:22px;bottom:22px;max-width:380px;padding:14px 17px;border-radius:12px;background:var(--ls-navy);color:#fff;box-shadow:var(--ls-shadow);z-index:50}.ls-toast[hidden]{display:none}.ls-assignment-layout{display:grid;grid-template-columns:300px minmax(0,1fr);gap:18px;align-items:start}.ls-assignment-list{position:sticky;top:96px}.ls-progress{height:8px;background:#e5edf6;border-radius:999px;overflow:hidden}.ls-progress span{display:block;height:100%;background:var(--ls-blue)}.ls-item-card{margin-bottom:16px;padding:22px;background:#fff;border:1px solid var(--ls-line);border-radius:18px}.ls-item-card h3{margin:0 0 7px;color:var(--ls-navy)}.ls-item-card .ls-stable{color:var(--ls-muted);font:700 11px ui-monospace,SFMono-Regular,Consolas,monospace}.ls-stimulus{margin:15px 0;padding:18px;background:#f4f7fb;border-left:4px solid var(--ls-blue);border-radius:10px;line-height:1.75}.ls-prompt{font-weight:760;line-height:1.65}.ls-options{display:grid;gap:9px;margin-top:13px}.ls-option{display:flex;gap:10px;padding:12px;border:1px solid var(--ls-line);border-radius:11px;cursor:pointer}.ls-option:has(input:checked){border-color:var(--ls-blue);background:#edf5ff}.ls-option input{accent-color:var(--ls-blue)}.ls-writing{width:100%;min-height:220px;padding:15px;border:1px solid #c6d3e3;border-radius:12px;font:inherit;line-height:1.7;resize:vertical}.ls-save-state{font-size:12px;color:var(--ls-muted)}.ls-result{margin-top:13px;padding:12px;border-radius:11px;background:#eef5ff;color:#234c83}.ls-result.is-correct{background:#eaf8f1;color:#116f4b}.ls-result.is-wrong{background:#fff0f0;color:#a33131}.ls-audio-controls{display:flex;gap:9px;flex-wrap:wrap;margin-top:12px}.ls-audio-status{margin-top:9px;color:var(--ls-muted);font-size:13px}.ls-student-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:14px 0}.ls-student-summary div{padding:13px;background:#f4f7fb;border-radius:12px}.ls-student-summary span,.ls-student-summary strong{display:block}.ls-student-summary span{font-size:11px;color:var(--ls-muted)}.ls-student-summary strong{margin-top:3px;font-size:20px}.ls-footer-actions{position:sticky;bottom:12px;display:flex;justify-content:space-between;align-items:center;gap:12px;padding:14px 16px;background:rgba(255,255,255,.96);border:1px solid var(--ls-line);border-radius:14px;box-shadow:var(--ls-shadow)}
@media(max-width:1050px){.ls-sidebar,.ls-main{grid-column:1/-1}.ls-question-layout{grid-template-columns:1fr}.ls-builder{position:static}.ls-filter{grid-template-columns:repeat(2,1fr)}.ls-assignment-layout{grid-template-columns:1fr}.ls-assignment-list{position:static}.ls-assignment-list .ls-card-body{display:flex;overflow:auto}.ls-assignment-list .ls-list-item{min-width:260px}.ls-feedback-grid{grid-template-columns:1fr 1fr}}
@media(max-width:680px){.ls-header{align-items:flex-start}.ls-header nav{gap:10px}.ls-shell{width:min(100% - 20px,1500px);padding-top:24px}.ls-hero{display:block}.ls-actions{margin-top:15px}.ls-stat-grid,.ls-student-summary{grid-template-columns:1fr}.ls-field-row,.ls-filter{grid-template-columns:1fr}.ls-question-card{grid-template-columns:auto minmax(0,1fr)}.ls-question-card>code{grid-column:2}.ls-feedback-grid{grid-template-columns:1fr}.ls-footer-actions{align-items:stretch;flex-direction:column}.ls-footer-actions .ls-button{width:100%}}