:root{--ink:#151b24;--muted:#657080;--line:#d7dce3;--purple:#8b5cf6;--cyan:#35d8c2;--pink:#d05adf}
*{box-sizing:border-box}
body{margin:0;min-height:100vh;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:#eef1f4}
.app{max-width:1180px;margin:auto;padding:28px 22px 50px}
.site-header,.page-header{background:#fff;border:1px solid var(--line);padding:30px;margin-bottom:18px}
.site-logo-row{display:flex;justify-content:flex-start;margin-bottom:22px}
.xtart-logo{display:inline-flex;align-items:center;gap:9px;text-decoration:none;color:#151b24;font-weight:950;letter-spacing:2px;font-size:17px}
.xtart-mark{width:29px;height:29px;display:inline-grid;place-items:center;color:#fff;font-size:11px;background:linear-gradient(135deg,#35d8c2,#8b5cf6,#d05adf);border-radius:8px}
.xtart-logo:hover{opacity:.82}
.eyebrow,.unit-label{font-size:12px;font-weight:900;letter-spacing:2px;color:#7650df;text-transform:uppercase;margin-bottom:9px}
.site-header h1,.page-header h1{margin:0;font-size:38px;line-height:1.05;letter-spacing:-1px}
.subtitle{margin:10px 0 0;color:var(--muted);font-size:16px;line-height:1.45}
.gradient{height:7px;margin-top:22px;background:linear-gradient(90deg,var(--cyan),var(--purple),var(--pink))}
.view{display:none}.view.active{display:block}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.activity-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.card{display:block;text-align:left;background:#fff;border:1px solid var(--line);padding:21px;color:inherit;text-decoration:none;transition:.16s}
.card:hover{transform:translateY(-2px);border-color:#a68be9;box-shadow:0 7px 22px rgba(21,27,36,.07)}
.course-card{min-height:185px;display:flex;flex-direction:column;justify-content:center;padding:28px;cursor:pointer}
.course-card h3{font-size:25px;margin-top:13px}
.unit-card{min-height:145px;cursor:pointer;font:inherit;color:inherit;width:100%;}.activity-card{min-height:170px}
.card .tag{font-size:10px;font-weight:900;letter-spacing:1.4px;color:#7650df;text-transform:uppercase}
.card h3{margin:10px 0 7px;font-size:19px;line-height:1.15}
.card p{margin:0;color:var(--muted);font-size:14px;line-height:1.4}
.status{display:inline-block;margin-top:16px;padding:6px 8px;font-size:9px;font-weight:900;letter-spacing:1px;text-transform:uppercase;background:#f0edf9;color:#7650df}
.status.ready{background:#eaf8f2;color:#168052}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:15px;margin:22px 0 13px}
.section-head h2{font-size:24px;margin:0}.breadcrumb{font-size:12px;color:var(--muted);margin-bottom:5px}
.back{border:1px solid var(--line);background:#fff;padding:9px 13px;font-weight:800;cursor:pointer}
.empty{background:#fff;border:1px dashed #cbd1d9;padding:30px;color:var(--muted)}
.activity-icon{width:42px;height:42px;display:grid;place-items:center;border:1px solid var(--line);margin-bottom:13px;background:#f8f9fb}
.activity-icon svg{width:24px;height:24px;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.activity-icon.vocab svg{stroke:#35a79a}.activity-icon.grammar svg{stroke:#7650df}.activity-icon.escape svg{stroke:#d05adf}
.xtart-footer{display:flex;justify-content:flex-end;margin:32px 24px 8px;padding:12px 0;color:#7a8491;font-size:11px;letter-spacing:.35px}
.xtart-back{position:fixed;left:22px;bottom:20px;z-index:20;display:inline-flex;align-items:center;gap:8px;padding:11px 15px;border:1px solid #111923;background:#111923;color:#fff;text-decoration:none;font-size:11px;font-weight:900}
.auth-card{width:min(480px,100%);background:#fff;border:1px solid var(--line);padding:32px}
.auth-card h1{font-size:30px;margin:0 0 9px}.auth-card p{color:var(--muted);line-height:1.45}
.auth-input{width:100%;border:1px solid #cfd5dd;padding:14px 15px;font:inherit;font-size:16px;margin:10px 0 12px}
.auth-error{min-height:20px;color:#b63b3b;font-size:13px;font-weight:800;margin:4px 0 12px}
.btn{border:1px solid #111923;background:#111923;color:#fff;padding:11px 15px;font:inherit;font-size:11px;font-weight:900;letter-spacing:1px;cursor:pointer}
.options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:20px}
.option{width:100%;border:1px solid var(--line);background:#fafbfc;padding:15px 16px;cursor:pointer;font:inherit;font-weight:800;text-align:left}
.option.correct{border-color:#20a36a;background:#eaf8f2}.option.wrong{border-color:#d44a4a;background:#fff2f2}.option:disabled{cursor:default}
.feedback{margin-top:16px;min-height:22px;font-weight:900}.score{margin-top:13px!important;font-size:12px!important}
.match-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.match-col{display:flex;flex-direction:column;gap:10px}
.match-item{border:1px solid var(--line);background:#fafbfc;padding:14px 16px;cursor:pointer;font:inherit;font-weight:800;text-align:left}
.match-item.active{border-color:#7650df;background:#f4f0ff}.match-item.matched{border-color:#20a36a;background:#eaf8f2;cursor:default}
.question{margin-top:18px}.question h2{font-size:22px}
.fill-input{width:100%;max-width:620px;border:1px solid #cfd5dd;background:#fff;padding:15px 16px;font:inherit;font-size:17px;outline:none}
.fill-form{margin-top:20px;display:flex;gap:10px}.hint{margin-top:10px;color:#7a8491;font-size:12px}
@media(max-width:820px){.grid{grid-template-columns:repeat(2,1fr)}.activity-grid{grid-template-columns:1fr}}
@media(max-width:560px){.app{padding:14px 12px 35px}.site-header,.page-header{padding:23px 20px}.site-header h1,.page-header h1{font-size:29px}.grid{grid-template-columns:1fr}.options,.match-grid{grid-template-columns:1fr}.xtart-back{left:12px;bottom:12px}.xtart-footer{margin-right:14px}.fill-form{flex-direction:column}}
#loginModal{position:fixed;inset:0;background:rgba(21,27,36,.34);display:none;place-items:center;padding:20px;z-index:100}
body{background:#f5f7fa}.site-header,.page-header,.card,.auth-card{border-radius:18px;box-shadow:0 12px 35px #18203308}.site-header,.page-header{padding:30px}.card:hover{box-shadow:0 14px 40px #18203310}.btn,.back,.xtart-back{border-radius:10px;min-height:46px}.btn{background:#8b5cf6;border-color:#8b5cf6;color:#fff}.status{border-radius:8px}.gradient{border-radius:6px}.hub-tools{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-top:18px}.hub-editor{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;margin-top:20px}.hub-editor input,.hub-editor select{width:100%;padding:12px;font:inherit;font-size:16px;background:white;border:1px solid var(--line);border-radius:9px;margin:7px 0 14px}.hub-editor label{font-size:13px;font-weight:800}.hub-activity-edit{border:1px solid var(--line);border-radius:12px;padding:16px;margin:12px 0}.hub-editor .btn{margin:4px}.course-card.unavailable{opacity:.7;cursor:default}.hub-notice{color:#7650df;font-size:13px;margin-top:12px}@media(max-width:560px){.hub-tools .btn,.hub-editor .btn{width:100%}.card{padding:22px}.hub-editor{padding:18px}.site-header,.page-header{padding:22px}}

/* Shared English Hub design */
[hidden]{display:none!important}.app{width:100%}.card,.page-header,.site-header{overflow-wrap:anywhere}.activity-icon,.option,.match-item,.fill-input,.auth-input{border-radius:10px}.option,.match-item{min-height:48px;line-height:1.45}.option:hover:not(:disabled),.match-item:hover:not(.matched){border-color:var(--purple)}.fill-form{align-items:stretch}.fill-input{min-width:0}.question.card:hover,main.card:hover{transform:none}.activity-nav{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0}.activity-nav a{display:inline-flex;align-items:center;text-decoration:none;color:var(--ink)}.activity-context{margin:14px 0 0;color:var(--muted);font-size:13px;line-height:1.5}.teacher-mode{display:inline-block;color:#7650df;background:#f0edf9;border-radius:99px;padding:9px 13px;font-size:12px;font-weight:800}.quizloop-feature{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-top:38px;padding:28px;border:1px solid #d8cafa;border-radius:18px;background:linear-gradient(120deg,#f0eaff,#eefaf8);box-shadow:0 12px 35px #18203308;position:relative}.quizloop-feature:before{content:'';position:absolute;left:0;top:22px;bottom:22px;width:5px;border-radius:5px;background:linear-gradient(var(--purple),var(--cyan))}.quizloop-feature h3{font-size:28px;margin:8px 0}.quizloop-feature p{margin:0;color:var(--muted);line-height:1.5}.quizloop-feature .tag{font-size:11px;font-weight:900;letter-spacing:1.4px;color:#7650df}.quizloop-feature .btn{display:inline-flex;align-items:center;justify-content:center;text-decoration:none;white-space:nowrap}.quizloop-symbol{font-size:23px;letter-spacing:5px;margin-bottom:8px}.hub-tools{justify-content:space-between}.hub-editor{scroll-margin-top:20px}button,a,input,select{touch-action:manipulation}a:focus-visible,button:focus-visible{outline:3px solid #8b5cf6;outline-offset:3px}.match-grid>*{min-width:0}
@media(max-width:560px){.quizloop-feature{flex-direction:column;align-items:stretch;padding:24px;margin-top:30px}.quizloop-feature .btn{width:100%}.activity-nav a{flex:1;justify-content:center;min-width:120px}.option,.match-item{padding:16px;font-size:16px}.match-grid{gap:14px}.fill-form .btn{min-height:48px}.page-header h1,.site-header h1{line-height:1.15}.auth-input{font-size:16px}.app{padding-bottom:28px}.xtart-footer{margin:24px 0 8px}}
.site-logo-row{gap:16px;align-items:center;flex-wrap:wrap}.quizloop-symbol{color:#8b5cf6}.auth-card label{font-size:13px;font-weight:800}

.instructions{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;margin:18px 0;color:var(--muted);line-height:1.5}.instructions strong{color:#7650df;margin-right:10px}.board{display:grid;grid-template-columns:1fr 1fr;gap:18px}.column{min-width:0;background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:0 12px 35px #18203308}.column-title{font-size:18px;font-weight:900;margin-bottom:16px}.cards{display:grid;gap:10px}.match-card{width:100%;text-align:left;font:inherit;font-size:16px;line-height:1.45;padding:16px;border:1px solid var(--line);border-radius:10px;min-height:52px;background:#fafbfc;cursor:pointer;overflow-wrap:anywhere}.match-card:hover:not(:disabled){border-color:var(--purple)}.match-card.selected{background:#f4f0ff;border-color:var(--purple)}.match-card.matched{background:#eaf8f2;border-color:#20a36a;color:#168052;cursor:default}.match-card.wrong{background:#fff2f2;border-color:#d44a4a}.match-card .badge{display:inline-block;font-size:10px;margin-left:7px;font-weight:900}.feedback.success{color:#168052}.feedback.error{color:#b63b3b}.feedback.ready{color:#7650df}.progress-wrap{margin-top:18px}.progress-bar{height:9px;border-radius:99px;background:#e7eaf0;overflow:hidden}.progress{height:100%;background:linear-gradient(90deg,var(--cyan),var(--purple));transition:width .2s}.progress-text{color:var(--muted);font-size:12px;margin-top:10px;font-weight:800}.overlay{display:none;position:fixed;inset:0;z-index:100;place-items:center;padding:20px;background:#151b2455}.overlay.show{display:grid}.modal{width:min(460px,100%);background:#fff;border:1px solid var(--line);border-radius:18px;padding:30px;box-shadow:0 20px 70px #0003}.modal h2{font-size:30px;margin:10px 0}.modal p{line-height:1.5;color:var(--muted)}.reset{background:var(--purple);color:white;border:0;border-radius:10px;font:inherit;font-weight:900;padding:14px 18px;min-height:48px;cursor:pointer}@media(max-width:560px){.board{grid-template-columns:1fr}.column{padding:18px}.instructions{font-size:14px}}

.readingToggle{position:fixed;right:16px;bottom:16px;z-index:45;padding:10px 14px;border:1px solid #8490a5;border-radius:12px;background:#fff;color:#182032;font:700 12px Arial;box-shadow:0 4px 20px #0002;cursor:pointer;min-height:44px}.readingMode{font-size:21px!important}.readingMode .small,.readingMode .tag,.readingMode .eyebrow,.readingMode .muted{font-size:16px!important}.readingMode .question,.readingMode .question-text{font-size:clamp(28px,3vw,44px)!important}.readingMode .btn,.readingMode button.answer,.readingMode .option{font-size:19px!important}.readingMode .app,.readingMode .wrap{max-width:1450px}.readingMode .panel{max-width:1400px}.readingMode .card p{font-size:18px}.readingMode .projectorRows .player{font-size:clamp(24px,3vw,40px)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #28b6ca;outline-offset:4px}@media(max-width:600px){.readingToggle{right:10px;bottom:10px;font-size:10px}.readingMode{font-size:18px!important}}@media(prefers-reduced-motion:reduce){*{animation:none!important;scroll-behavior:auto!important}}

.hub-discovery{margin:18px 0 24px}.hub-discovery>input{width:100%;padding:15px;border:1px solid var(--line);border-radius:12px;font:inherit;margin-top:8px;background:white}.continueCard{display:flex;align-items:center;justify-content:space-between;gap:18px;background:#fff;border:1px solid var(--line);border-left:4px solid var(--purple);border-radius:18px;padding:20px;margin-bottom:20px}.continueCard h3{margin:8px 0}.continueCard p{margin:0;color:var(--muted)}.newBadge{background:#d9f5eb;color:#176b50;border-radius:6px;padding:4px 7px;font-size:10px}.hubConnection{position:fixed;top:0;left:0;right:0;z-index:80;background:#fff0c9;padding:12px;text-align:center;color:#4c390f}.hubConnection button{margin-left:12px}@media(max-width:600px){.continueCard{flex-direction:column;align-items:stretch}.activity-grid,.grid{grid-template-columns:1fr}.app{padding:16px 12px 70px}.site-header,.page-header{padding:22px}.auth-card{width:calc(100% - 24px);padding:24px}input,select,textarea{font-size:16px!important}.hub-tools{flex-wrap:wrap}}

.inlineHelp{padding:12px;border:1px solid var(--line);border-radius:10px;margin:12px 0}.publishChoice{display:flex!important;align-items:center;gap:10px}.publishChoice input{width:20px!important;min-height:20px!important}.hubPreview{width:min(1000px,calc(100% - 24px));max-height:92dvh;overflow:auto;border:1px solid var(--line);border-radius:20px;padding:24px;color:var(--ink)}.hubPreview::backdrop{background:#172034aa}.hubPreview iframe{width:100%;height:60vh;border:1px solid var(--line);border-radius:12px;margin:14px 0}.trashRow{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:15px;border-bottom:1px solid var(--line);flex-wrap:wrap}.hub-tools button:disabled{opacity:.4;cursor:default}