*{box-sizing:border-box}html{--accent:#6251d7;--pale:#ece9fa;--soft:#dbd5f6;--ink:#252735;--muted:#70717c;--paper:#f8f7f2;--line:#e5e3db;background:var(--paper);color:var(--ink);font-family:Vazir,Tahoma,sans-serif;scroll-behavior:smooth}html[data-theme=math]{--accent:#126d61;--pale:#e4f0e8;--soft:#bfdbca}html[data-theme=science]{--accent:#a9582c;--pale:#fbefde;--soft:#ead1aa}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}button,a{transition:background .18s,transform .18s,box-shadow .18s}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--accent);outline-offset:4px}a{color:var(--accent);text-decoration:none}h1,h2,h3,p{margin:0}h1{font-size:36px;line-height:1.65;font-weight:800;letter-spacing:-1px}h2{font-size:21px;line-height:1.8}h3{font-size:16px;line-height:1.7}p{line-height:1.95}.rail{position:fixed;right:0;top:0;bottom:0;width:230px;background:#efeee7;padding:38px 24px;display:flex;flex-direction:column;border-left:1px solid var(--line);z-index:5}.brand{display:flex;align-items:center;gap:11px;color:var(--ink);font-size:27px;font-weight:bold}.brand img{width:45px;height:45px}.brand small{display:block;font:11px Arial;letter-spacing:2px;margin-top:4px;color:var(--muted)}.rail-caption{font-size:11px;color:var(--muted);margin:24px 7px 30px}.rail nav{display:grid;gap:9px}.nav-item{display:flex;align-items:center;gap:13px;background:transparent;border:0;padding:13px 15px;text-align:right;color:#70717a;border-radius:10px;font-size:14px}.nav-item>span{font:25px Arial;width:24px;text-align:center}.nav-item.active{color:var(--accent);background:#fff;font-weight:700;box-shadow:0 3px 8px #33333304}.nav-item:hover{background:#ffffff80}.nav-item b{margin-right:auto;font-size:12px}.rail-foot{margin-top:auto;padding:30px 15px 0}.little-orbit{display:block;font-size:40px;color:var(--accent);margin-bottom:10px}.rail-foot strong{font-size:13px}.rail-foot p{font-size:12px;color:var(--muted);margin-top:8px}.version{display:block;margin-top:30px;font-size:10px;color:#888980}.workspace{margin-right:230px;max-width:1800px}.topbar{height:96px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding:0 50px}.breadcrumb{font-size:12px;color:var(--muted)}.breadcrumb span{padding:0 14px;color:#bbb}.top-actions{display:flex;gap:20px;align-items:center}.sample-label{font-size:11px;border:1px solid #deddd3;border-radius:6px;padding:5px 10px;color:var(--muted)}.avatar{border:0;border-radius:50%;width:37px;height:37px;background:#ded6fb;color:#594aad;font-weight:bold}main{max-width:1250px;min-height:calc(100vh - 175px);margin:auto;padding:38px 50px 40px;animation:arrive .28s ease-out}footer{display:flex;justify-content:space-between;padding:20px 50px;border-top:1px solid var(--line);font-size:10px;color:#8c8c86}footer span{color:#999991}.page-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:27px}.eyebrow{font-size:11px;font-weight:700;letter-spacing:.2px;color:var(--accent);margin-bottom:6px}.lead{font-size:14px;color:var(--muted);max-width:680px;line-height:2}.wave{font-size:29px;color:#b29b59;padding-right:8px}.day-label{border-right:1px solid var(--line);padding-right:20px;display:grid;gap:8px;color:#666960;min-width:130px;font-size:12px}.day-label span{font-size:10px;color:var(--muted)}.course-tabs{display:flex;gap:28px;border-bottom:1px solid var(--line);margin-bottom:28px;overflow:auto}.course-tabs button{border:0;border-bottom:3px solid transparent;background:transparent;padding:10px 0 16px;white-space:nowrap;color:var(--muted);font-size:13px;display:flex;align-items:center;gap:9px}.course-tabs button.active{border-bottom-color:var(--accent);color:var(--ink);font-weight:bold}.subject-dot{display:inline-block;width:9px;height:9px;border-radius:3px}.subject-dot.en{background:#8e7dde}.subject-dot.math{background:#4c9a86}.subject-dot.science{background:#d49352}.learning-hero{position:relative;display:grid;grid-template-columns:1.25fr 1fr;background:var(--pale);border-radius:20px;min-height:330px;overflow:hidden;padding:34px 38px;gap:10px}.hero-copy{z-index:1}.hero-copy h2{font-size:37px;line-height:1.7;font-weight:900;letter-spacing:-1.2px;margin:9px 0}.hero-copy p:not(.eyebrow){font-size:12px;color:#686578;max-width:360px}.hero-copy small{display:block;font-size:10px;color:#83808f;margin-top:15px}.hero-buttons{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-top:23px}.primary,.subtle,.text-button{border:0;border-radius:9px;font-size:12px;font-weight:700;padding:12px 17px;display:inline-flex;align-items:center;justify-content:center;gap:5px;line-height:1.9}.primary{background:var(--accent);color:white;box-shadow:0 3px 0 #00000012}.primary:hover{transform:translateY(-2px);filter:brightness(1.06)}.subtle{background:#ffffffb3;border:1px solid #dddcd2;color:var(--ink)}.subtle:hover{background:white}.text-button{background:transparent;color:var(--accent);padding:9px 4px}.wide{width:100%}.hero-art{position:relative;min-height:245px;align-self:center;direction:ltr}.letter-card{position:absolute;width:165px;height:198px;left:30px;top:0;border-radius:17px;transform:rotate(-10deg);background:#fffdf9;box-shadow:9px 14px 0 #b8aed74a;border:1px solid #ddd8ee;display:flex;flex-direction:column;justify-content:center;align-items:center}.letter-card span{font:86px Georgia;color:#7766be}.letter-card small{font:9px Arial;letter-spacing:2px;color:#aaa0c6;margin-top:15px}.bubble{position:absolute;bottom:35px;right:3px;background:#7762cc;color:#fff;border-radius:13px 13px 2px 13px;font:bold 16px Georgia;padding:21px 22px;transform:rotate(4deg);box-shadow:0 8px 12px #61529818;animation:float 7s ease-in-out infinite}.bubble i{position:absolute;font-size:40px;top:-24px;right:-10px;color:#bfad54;font-style:normal}.floating{position:absolute;background:#fffdf2;padding:8px 15px;font-size:10px;color:#777365;border-radius:20px;box-shadow:0 3px 8px #00000007}.tag-a{bottom:0;left:0;transform:rotate(-3deg)}.graph-grid{position:absolute;inset:0;background-image:linear-gradient(#74998d1c 1px,transparent 1px),linear-gradient(90deg,#74998d1c 1px,transparent 1px);background-size:24px 24px;border-radius:50%;opacity:.8}.formula{position:absolute;left:30px;top:8px;background:#fffff7;border-radius:9px;padding:14px 26px;transform:rotate(-7deg);font:28px Georgia;color:#2e7868;box-shadow:0 6px 0 #c9ddca}.scale{position:absolute;left:30px;right:20px;top:110px;border-top:4px solid #568c75;height:80px}.scale i{position:absolute;left:50%;height:75px;border-left:5px solid #568c75;top:-6px}.scale b,.scale em{position:absolute;bottom:0;left:0;background:#7daf91;padding:18px 25px;border-radius:0 0 35px 35px;color:white;font:26px Georgia;box-shadow:0 6px 0 #bcd7c2}.scale em{left:auto;right:0;background:#edf4e2;color:#407158}.atom{position:absolute;width:130px;height:140px;left:5px;top:10px}.atom i{position:absolute;inset:20px 0;border:2px solid #bf873e;border-radius:50%;transform:rotate(55deg)}.atom i:nth-child(2){transform:rotate(-55deg)}.atom b{position:absolute;top:60px;left:56px;width:20px;height:20px;background:#bb7034;border-radius:50%;box-shadow:0 0 0 9px #e7c69a70}.flask{position:absolute;width:124px;height:150px;bottom:15px;right:15px;background:#fff6df;border:3px solid #b78d52;clip-path:polygon(32% 0,68% 0,68% 30%,100% 86%,92% 100%,8% 100%,0 86%,32% 30%)}.flask span{position:absolute;inset:70px 0 0;background:#de9c46}.flask i{position:absolute;bottom:30px;left:20px;width:12px;height:12px;border-radius:50%;background:#fff4c9;animation:float 3s infinite}.flask i:nth-last-child(1){left:60px;bottom:50px;animation-delay:1s}.review-strip{display:flex;align-items:center;gap:18px;padding:25px 3px;margin:10px 0;border-bottom:1px solid var(--line)}.review-strip p{font-size:11px;color:var(--muted)}.review-strip>button{margin-right:auto;white-space:nowrap}.review-icon{font:34px Georgia;color:#a1844b;width:45px;text-align:center}.section-heading{display:flex;justify-content:space-between;align-items:center;margin:24px 0 6px}.section-heading h2{font-size:18px}.skill-row{display:flex;align-items:center;gap:17px;padding:18px 4px;border-bottom:1px solid var(--line)}.step{background:#eeede6;width:39px;height:39px;border-radius:11px;display:grid;place-items:center;color:#83877b;font-size:15px;flex-shrink:0}.step.done{background:var(--pale);color:var(--accent)}.skill-copy{flex:1}.skill-copy p{font-size:11px;color:var(--muted);margin-top:2px}.skill-copy small{font-size:10px;color:#898b80}.skill-actions{display:flex;gap:9px;align-items:center}.skill-actions .subtle{padding:6px 15px;font-size:11px;background:transparent}.demo{margin-top:27px;border:1px dashed #cecbbd;border-radius:9px;padding:12px 17px;color:#78776b;font-size:11px}.demo summary{cursor:pointer}.demo p{margin:10px 0}.demo>div{display:flex;gap:8px;flex-wrap:wrap}.demo .subtle{font-size:10px;padding:6px 10px}.empty-panel,.result-panel{padding:42px 25px;text-align:center;background:#fffdf8;border:1px solid var(--line);border-radius:15px;margin:20px 0}.empty-panel p,.result-panel .lead{margin:10px auto 20px}.empty-symbol,.result-symbol{display:block;font:65px Georgia;color:var(--accent);margin-bottom:15px}.empty-panel .demo{text-align:right}.result-panel .hero-buttons{justify-content:center}.big-number{font:44px Tahoma;color:var(--accent);text-align:center}.big-number small{display:block;font:11px Vazir;margin-top:8px}.due-row{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:14px 0;border-bottom:1px solid var(--line);font-size:12px}.due-row span{color:var(--muted)}.fine-print{font-size:11px;color:var(--muted);line-height:2;margin:18px 0}.explain-panel{background:#f0efe7;border-radius:12px;padding:24px;margin:25px 0}.explain-panel p{font-size:12px;color:var(--muted);margin:10px 0}.auth-layout{display:grid;grid-template-columns:1fr 1fr;gap:45px;padding:25px 0}.auth-layout .hero-art{max-width:300px;margin-top:30px}.auth-form{background:#fffdf8;border:1px solid var(--line);border-radius:15px;padding:30px}.auth-form h2{margin-bottom:22px}label{display:block;font-size:12px;line-height:1.9}input:not([type=checkbox]):not([type=radio]):not([type=range]),select,textarea{display:block;width:100%;padding:11px 12px;border:1px solid #d6d6ce;background:#fff;border-radius:7px;margin:7px 0 17px;color:var(--ink);font-size:14px}textarea{resize:vertical;min-height:100px}input[type=radio],input[type=checkbox]{accent-color:var(--accent);width:19px;height:19px;flex-shrink:0}.inline-form{display:flex;gap:20px;align-items:end;max-width:550px;margin:30px 0}.inline-form label{flex:1}.inline-form button{margin-bottom:17px}.assign-form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:5px 20px;margin-top:20px}.assign-form button{align-self:center}.table-wrap{overflow:auto;background:#fffdf9;border:1px solid var(--line);border-radius:12px}table{width:100%;border-collapse:collapse;font-size:12px}th,td{text-align:right;padding:12px 18px;border-bottom:1px solid var(--line)}th{background:#eeede5;color:#77796c;font-size:11px}.invite-output{font-weight:bold;color:var(--accent);user-select:all;overflow-wrap:anywhere}.activity-top{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--muted)}.activity-top b{font-size:11px}.progress{height:5px;background:#e5e4dc;border-radius:3px;margin:18px 0 32px;overflow:hidden}.progress i{display:block;height:100%;background:var(--accent);transition:width .3s}.activity{max-width:760px;margin:auto;background:#fffefa;border:1px solid var(--line);border-radius:18px;padding:32px 38px}.activity-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:30px}.small-tag{font-size:10px;padding:4px 11px;background:var(--pale);color:var(--accent);border-radius:5px}.quiet{font-size:10px;color:var(--muted)}.question{font-size:24px;letter-spacing:0;line-height:1.8;margin-bottom:25px;unicode-bidi:plaintext}.passage{margin:0 0 22px;background:var(--pale);padding:20px;font:19px/1.8 Georgia;border-left:3px solid var(--accent);border-radius:8px}.activity fieldset{border:0;margin:0;padding:0;min-width:0}.options{display:grid;gap:10px}.option{display:flex;gap:12px;align-items:center;border:1px solid #dddcd4;border-radius:9px;padding:14px 16px;background:#fff;cursor:pointer;font-size:15px}.option:has(input:checked){background:var(--pale);border-color:var(--accent)}.option:hover{border-color:var(--accent)}.answer-actions{display:flex;gap:15px;align-items:center;border-top:1px solid var(--line);padding-top:22px;margin-top:28px;flex-wrap:wrap}.feedback{background:#eef2e6;border-right:3px solid #6c8b53;padding:14px 18px;margin-top:20px;border-radius:6px;animation:arrive .2s}.feedback p{font-size:13px;margin-top:4px}.feedback strong{font-size:13px}.feedback.hint,.feedback.learn{background:#faf0d9;border-color:#b39556}.feedback.recorded,.feedback.pending{background:var(--pale);border-color:var(--accent)}.finish-placement{margin-top:20px;font-size:11px}.matching{display:grid;gap:12px}.matching label{display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);font-size:16px}.matching input,.matching select{max-width:190px}.sentence{padding:17px;min-height:80px;background:var(--pale);border:1px dashed var(--soft);border-radius:9px;margin:15px 0;display:flex;gap:6px;flex-wrap:wrap}.tokens{display:flex;gap:8px;flex-wrap:wrap}.token{background:white;border:1px solid #d6d1c7;border-radius:7px;padding:10px 15px;font:17px Georgia;box-shadow:0 3px 0 #e4e1d9}.token.selected{border-color:var(--accent);color:var(--accent)}.muted{font-size:12px;color:var(--muted)}.numberline,.balance-visual,.lab-visual,.diagram-visual{padding:20px;background:var(--pale);border-radius:10px;margin-bottom:20px}.numberline{display:flex;justify-content:space-between;border-bottom:2px solid var(--accent);direction:ltr;font:16px Georgia}.lab-visual{font-size:13px}.lab-visual input{width:100%;accent-color:var(--accent)}.lab-visual output{font-size:24px;color:var(--accent)}.particle-diagram{width:100%;max-height:180px}.result-numbers{display:flex;justify-content:center;gap:70px;margin:30px 0}.result-numbers b{display:block;font-size:42px;color:var(--accent)}.result-numbers span{font-size:12px;color:var(--muted)}.domain-results{display:flex;gap:15px;flex-wrap:wrap;justify-content:center;margin:25px 0}.domain-results article{background:var(--pale);border-radius:9px;padding:18px;min-width:150px;font-size:12px}.domain-results small{color:var(--muted);font-size:10px}.loading{text-align:center;padding:100px 25px}.loading strong{font-size:34px}.loading p{color:var(--muted)}#notice{position:fixed;bottom:25px;left:25px;max-width:420px;background:#292d32;color:#fff;padding:14px 20px;border-radius:10px;font-size:12px;box-shadow:0 6px 25px #0003;opacity:0;transform:translateY(10px);pointer-events:none;z-index:99;transition:.25s;line-height:1.9}#notice.show{opacity:1;transform:translateY(0)}.busy button{cursor:progress}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;top:-100px;right:260px;z-index:100;background:white;padding:10px}.skip-link:focus{top:10px}@keyframes arrive{from{opacity:.6;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}@keyframes float{0%,100%{translate:0 0}50%{translate:0 -6px}}@media(min-width:1500px){main{padding-top:48px}.learning-hero{min-height:380px}.hero-copy h2{font-size:44px}.hero-art{max-width:340px;width:100%;justify-self:center}}@media(max-width:1100px){.rail{width:195px;padding:30px 17px}.workspace{margin-right:195px}main{padding:28px}.topbar{padding:0 28px}.learning-hero{padding:27px;grid-template-columns:1.2fr 1fr}.hero-copy h2{font-size:31px}.hero-copy .hero-buttons{gap:8px}.hero-copy .text-button{font-size:10px}.hero-art{transform:scale(.88);transform-origin:center}.day-label{display:none}}@media(max-width:760px){.rail{position:fixed;top:auto;bottom:0;right:0;left:0;width:auto;height:72px;padding:0 6px;background:#faf9f3ed;backdrop-filter:blur(12px);border-left:0;border-top:1px solid var(--line)}.rail .brand,.rail-caption,.rail-foot{display:none}.rail nav{display:flex;justify-content:space-around;gap:0;height:100%;align-items:center}.nav-item{flex-direction:column;gap:2px;font-size:9px;padding:5px 7px;min-width:60px;position:relative}.nav-item>span{font-size:23px}.nav-item.active{background:transparent;box-shadow:none}.nav-item b{position:absolute;right:1px;top:0;font-size:8px;background:var(--accent);color:#fff;border-radius:7px;padding:0 4px}.workspace{margin-right:0;padding-bottom:72px}.topbar{height:67px;padding:0 20px}.topbar:before{content:'درس‌باز';font-size:22px;font-weight:900;color:var(--accent)}.breadcrumb{display:none}.top-actions{gap:10px}.sample-label{font-size:9px;padding:3px 6px}main{padding:23px 20px 30px}h1{font-size:27px}.lead{font-size:12px}.eyebrow{font-size:10px}.page-heading{margin-bottom:19px}.course-tabs{gap:24px;margin-bottom:20px}.course-tabs button{font-size:12px;padding-bottom:12px}.learning-hero{padding:25px;grid-template-columns:1fr;min-height:0;gap:0}.hero-copy h2{font-size:33px}.hero-copy p:not(.eyebrow){font-size:12px;max-width:260px}.hero-copy .text-button{font-size:11px}.hero-art{transform:scale(.8);width:280px;min-height:205px;margin-top:9px;margin-bottom:-12px;justify-self:center}.language-art .letter-card{height:175px;width:145px;left:18px}.bubble{right:-5px;bottom:28px}.hero-art .tag-a{bottom:-10px}.hero-buttons{gap:8px}.review-strip{gap:9px;padding:20px 0}.review-strip h3{font-size:13px}.review-strip p{font-size:10px}.review-strip>button{font-size:10px;padding:8px}.review-icon{font-size:29px;width:30px;flex-shrink:0}.section-heading h2{font-size:16px}.section-heading button{font-size:10px}.skill-row{gap:11px}.skill-copy h3{font-size:13px}.skill-copy p{font-size:10px}.skill-copy small{font-size:9px}.skill-actions{flex-direction:column;gap:0}.skill-actions .subtle{padding:5px 11px;font-size:10px}.skill-actions .text-button{font-size:10px;padding:4px}.step{width:33px;height:33px}.demo{font-size:10px;padding:12px}.auth-layout{grid-template-columns:1fr;gap:20px;padding:5px 0}.auth-layout .hero-art{display:none}.auth-layout h1 br{display:none}.auth-form{padding:23px}.activity{padding:23px 20px}.activity-heading{margin-bottom:20px;align-items:flex-start}.activity-heading .quiet{max-width:160px;line-height:1.8}.question{font-size:21px}.activity-top{font-size:10px}.activity-top b{font-size:9px}.activity-top .text-button{font-size:10px}.option{padding:12px;font-size:14px}.answer-actions{gap:10px}.answer-actions .primary{flex-grow:1}.answer-actions .text-button{font-size:10px}.matching label{font-size:13px;gap:10px}.matching input,.matching select{max-width:145px}.empty-panel,.result-panel{padding:30px 20px}.result-numbers{gap:40px}.result-numbers b{font-size:36px}.domain-results article{min-width:120px}.assign-form{grid-template-columns:1fr}.explain-panel{padding:20px}.inline-form{align-items:stretch;flex-direction:column;gap:0}table{font-size:10px}th,td{padding:10px}.due-row{font-size:10px;gap:12px}.due-row .text-button{font-size:10px}.big-number{font-size:34px}footer{padding:18px 20px;display:block;font-size:9px}footer span{display:block;margin-top:5px}#notice{left:15px;right:15px;bottom:85px;max-width:none;font-size:11px}.skip-link{right:20px}.passage{font-size:17px}.particle-diagram{max-height:140px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@font-face{font-family:Vazir;src:url('assets/Vazirmatn-Regular.ttf') format('truetype');font-weight:100 500;font-display:swap}@font-face{font-family:Vazir;src:url('assets/Vazirmatn-Bold.ttf') format('truetype');font-weight:600 900;font-display:swap}.choices{display:grid;gap:10px}.choice{display:flex;align-items:center;gap:12px;padding:13px 16px;background:#fff;border:1px solid var(--line);border-radius:9px;cursor:pointer;font-size:15px}.choice:has(input:checked){background:var(--pale);border-color:var(--accent)}.choice-no{font-size:11px;color:var(--muted)}.choice-check{margin-right:auto;visibility:hidden;color:var(--accent)}.choice:has(input:checked) .choice-check{visibility:visible}.particles{display:flex;gap:12px;margin-bottom:20px;direction:ltr}.particles>div{flex:1;min-width:0;text-align:center;background:var(--pale);padding:10px;border-radius:9px}.particles svg{width:100%;fill:var(--accent)}.lab{display:flex;align-items:center;gap:24px;background:var(--pale);padding:20px;border-radius:12px;margin-bottom:20px}.lab>div:last-child{flex:1}.lab input{width:100%;accent-color:var(--accent);margin:15px 0}.beaker{width:100px;height:110px;border:3px solid var(--accent);border-top:0;position:relative;display:grid;place-items:center;overflow:hidden;border-radius:0 0 15px 15px;flex-shrink:0}.water{background:var(--soft);position:absolute;bottom:0;left:0;right:0;height:60%;z-index:0}.beaker span{z-index:1;font-size:22px}.balance{display:flex;justify-content:space-around;padding:20px;background:var(--pale);border-radius:9px;margin-bottom:20px;font:24px Georgia;color:var(--accent)}