:root{--ink:#132d3b;--muted:#63747d;--green:#b7ef73;--teal:#247b66;--paper:#f4f7f8;--line:#dce4e7;--white:#fff;--red:#a83232;--radius:18px;font-family:Tahoma,Arial,sans-serif;color:var(--ink);background:var(--paper);font-size:16px;font-synthesis:none}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button,a,input,select,textarea{touch-action:manipulation}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #337cb4;outline-offset:3px}button:disabled{opacity:.55;cursor:wait}img{max-width:100%}h1,h2,h3,p{margin-top:0}p{line-height:1.9}h1{line-height:1.45}h2{line-height:1.6}small,.muted{color:var(--muted)}small{font-size:.875rem}.topbar{height:88px;display:flex;align-items:center;justify-content:space-between;padding:0 5vw;background:#fff;border-bottom:1px solid var(--line);gap:24px;position:relative;z-index:3}.brand{flex-shrink:0;display:flex}.brand img{object-fit:contain}nav,.top-actions,.actions,.row{display:flex;align-items:center;gap:20px;flex-wrap:wrap}nav a{font-size:.9rem}nav a:hover{color:var(--teal)}.btn,button.primary{display:inline-flex;justify-content:center;align-items:center;gap:10px;padding:14px 24px;background:var(--ink);color:white;border:1px solid transparent;border-radius:10px;font-weight:bold;line-height:1.5}.btn:hover{background:#25495b}.btn.lime{background:var(--green);color:var(--ink)}.btn.outline{background:transparent;border-color:var(--line);color:var(--ink)}.btn.white{background:#fff;color:var(--ink)}.btn.small{padding:10px 17px;font-size:.875rem}.btn.danger{background:#fff0ef;color:var(--red);border-color:#f1c7c4}.text-btn{color:var(--ink);background:transparent;border:0;padding:10px}.icon-btn{border:1px solid var(--line);background:#fff;border-radius:8px;padding:6px 13px;font-size:1.3rem}.skip{position:fixed;top:-100px;right:20px;background:white;z-index:30;padding:15px}.skip:focus{top:10px}.landing{background:#fff}.hero{max-width:1340px;margin:auto;padding:80px 5vw 65px;display:grid;grid-template-columns:1.15fr 1fr;gap:6vw;align-items:center}.eyebrow{display:inline-flex;gap:10px;align-items:center;color:var(--teal);font-size:.875rem;font-weight:bold;letter-spacing:.02em}.eyebrow:before{content:'';width:24px;height:2px;background:currentColor}.hero h1{font-size:clamp(3.2rem,5.5vw,5rem);letter-spacing:-3px;line-height:1.4;margin:21px 0}.hero h1 em{font-style:normal;color:var(--teal);position:relative}.hero .lead{font-size:1.1rem;color:var(--muted);max-width:490px}.hero .actions{margin:30px 0}.hero-note{font-size:.875rem;color:var(--muted)}.journey{background:var(--ink);color:#fff;border-radius:28px;padding:38px;position:relative;box-shadow:16px 18px 0 #edf3ec;transform:rotate(-1deg)}.journey .overline{font-size:.75rem;letter-spacing:4px;color:var(--green);direction:ltr;text-align:right}.journey h2{font-size:1.7rem;margin:17px 0 28px}.journey-item{padding:19px 0;border-top:1px solid #36505d;display:flex;align-items:center;gap:17px}.journey-item .num{font:1.5rem Georgia,serif;color:var(--green)}.journey-item strong{display:block;margin-bottom:7px}.journey-item small{color:#bfd0d9}.journey-bottom{background:var(--green);color:var(--ink);margin:18px -13px -13px;padding:18px 20px;border-radius:12px;font-weight:bold;display:flex;justify-content:space-between}.ribbon{background:#eef5ea;padding:23px;text-align:center;color:#315d4b;font-size:.9rem}.ribbon span{margin:0 25px}.section{max-width:1200px;margin:auto;padding:70px 28px}.section-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:30px}.section-head h2{font-size:2rem;margin-bottom:5px}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;min-width:0}.grade-card{background:var(--paper);border:0;padding:30px;transition:transform .2s}.grade-card:hover{transform:translateY(-4px)}.grade-num{display:block;font:3rem Georgia,serif;color:var(--teal);margin-bottom:26px}.grade-card h3{font-size:1.4rem}.grade-card p{color:var(--muted);font-size:.9rem}.grade-card a{display:flex;justify-content:space-between;padding-top:18px;border-top:1px solid var(--line);font-weight:bold}.dark-section{background:var(--ink);color:white}.dark-section .muted{color:#bccdd6}.steps{counter-reset:steps}.steps .card{background:transparent;border-color:#3a525e}.steps .card:before{counter-increment:steps;content:'0' counter(steps);display:block;color:var(--green);font:2rem Georgia,serif;margin-bottom:25px}.feature-symbol{font-size:2rem;margin-bottom:20px;color:var(--teal)}.faq{max-width:850px}details{border-bottom:1px solid var(--line);padding:22px 0}summary{cursor:pointer;font-weight:bold;line-height:1.7}details p{color:var(--muted);margin:15px 0 0}.cta{background:#e6f3da;border-radius:24px;padding:45px;display:flex;justify-content:space-between;align-items:center;gap:25px}.footer{max-width:1200px;margin:auto;border-top:1px solid var(--line);padding:28px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;font-size:.875rem;color:var(--muted)}.auth-wrap{min-height:calc(100vh - 88px);display:grid;grid-template-columns:1fr 1fr;max-width:1200px;margin:auto;padding:45px 25px;gap:65px;align-items:start}.auth-story{padding:50px 25px;position:sticky;top:20px}.auth-story h1{font-size:3rem}.auth-form{background:#fff;border:1px solid var(--line);padding:35px;border-radius:24px}.auth-form h2{margin-bottom:5px}label{display:flex;flex-direction:column;gap:9px;font-size:.9rem;line-height:1.6;margin-bottom:19px}input,select,textarea{width:100%;padding:12px 14px;border:1px solid #cbd6da;border-radius:9px;color:var(--ink);background:#fff;min-height:47px}textarea{min-height:105px;resize:vertical}input[type=checkbox],input[type=radio]{width:19px;min-height:19px;accent-color:var(--teal)}label.check{flex-direction:row;align-items:center}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 18px}.full{grid-column:1/-1}.form-error{color:var(--red);background:#fff0ef;border-radius:8px;padding:12px;margin-bottom:15px}.form-error:empty{display:none}.shell{display:grid;grid-template-columns:230px minmax(0,1fr);max-width:1600px;margin:auto;min-height:calc(100vh - 88px)}.sidebar{padding:30px 18px;border-left:1px solid var(--line);background:#fff}.sidebar .label{font-size:.75rem;color:var(--muted);margin:14px 15px}.sidebar a{display:flex;padding:12px 15px;margin:4px 0;border-radius:9px;font-size:.9rem;gap:12px}.sidebar a:hover,.sidebar a.active{background:#eaf2e7;color:#245c43;font-weight:bold}.sidebar .user-box{padding:20px 14px;border-bottom:1px solid var(--line);margin-bottom:23px}.avatar{display:inline-flex;background:var(--ink);color:var(--green);width:44px;height:44px;align-items:center;justify-content:center;border-radius:14px;font-weight:bold}.workspace{padding:38px 4vw;min-width:0}.page-head{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:30px}.page-head h1{font-size:1.8rem;margin:0 0 8px}.page-head p{margin:0;color:var(--muted);font-size:.9rem}.banner{background:var(--ink);color:white;padding:28px;border-radius:var(--radius);margin-bottom:30px;display:flex;justify-content:space-between;align-items:center;gap:24px}.banner h2{font-size:1.35rem;margin:0 0 8px}.banner p{color:#ccdae0;margin:0;font-size:.9rem}.badge{display:inline-block;border-radius:30px;padding:5px 12px;background:#edf3e9;color:#305b36;font-size:.8rem;line-height:1.7}.badge.locked{background:#f0f2f4;color:#63747d}.badge.warn{background:#fff2ce;color:#765517}.stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-bottom:30px}.stat{padding:23px;background:#fff;border:1px solid var(--line);border-radius:14px}.stat strong{display:block;font:2rem Arial,sans-serif;margin-top:15px}.stat span{font-size:.875rem;color:var(--muted)}.subject-icon{font-size:1.6rem;background:#edf4e8;border-radius:13px;width:52px;height:52px;display:grid;place-items:center;margin-bottom:20px}.subject h3{margin-bottom:8px}.subject p{font-size:.875rem;color:var(--muted)}progress{width:100%;height:7px;border:0;border-radius:8px;overflow:hidden;margin:14px 0;accent-color:var(--teal)}progress::-webkit-progress-bar{background:#e9efed}progress::-webkit-progress-value{background:var(--teal)}.subject .foot{display:flex;justify-content:space-between;align-items:center;font-size:.85rem}.empty{padding:45px;text-align:center;border:1px dashed #c4d1d5;border-radius:15px;color:var(--muted);line-height:1.9}.subheading{font-size:1.2rem;margin:30px 0 20px}.lesson-row{display:flex;align-items:center;gap:20px;padding:23px;background:white;border:1px solid var(--line);border-radius:13px;margin:12px 0}.lesson-row .index{background:var(--paper);padding:13px;border-radius:10px;font-size:1.1rem}.lesson-row .grow{flex:1}.lesson-row h3{margin:0 0 7px;font-size:1rem}.lesson-row p{margin:0;font-size:.875rem;color:var(--muted)}.tabs{display:flex;gap:8px;border-bottom:1px solid var(--line);margin:20px 0;overflow:auto}.tabs button{padding:15px 20px;white-space:nowrap;border:0;background:transparent;color:var(--muted);border-bottom:3px solid transparent}.tabs button.active{border-color:var(--teal);color:var(--teal);font-weight:bold}.video-player{background:#0b1b24;border-radius:16px;overflow:hidden;margin-bottom:20px}video,iframe{width:100%;aspect-ratio:16/9;display:block;border:0}.flashcard{text-align:center;min-height:300px;display:flex;flex-direction:column;justify-content:center;padding:35px;background:white;border:1px solid var(--line);border-radius:20px}.flashcard h3{font-size:1.4rem;line-height:1.9}.flashcard .answer{padding:20px;color:var(--teal);white-space:pre-wrap}.quiz-question{margin:20px 0}.quiz-question legend{font-weight:bold;line-height:1.8;padding:5px}.choice{display:flex;align-items:center;gap:12px;padding:15px;border:1px solid var(--line);border-radius:10px;background:white;margin:10px 0}.quiz-result{background:#eaf6e4;border:1px solid #c5ddba;border-radius:14px;padding:24px}.wrong{background:#fff0ef;color:var(--red)}.toolbar{display:flex;gap:12px;justify-content:space-between;margin-bottom:22px;flex-wrap:wrap}.search{display:flex;gap:9px;max-width:450px;flex:1}.table-wrap{overflow:auto;background:white;border:1px solid var(--line);border-radius:14px}table{border-collapse:collapse;width:100%;text-align:right;font-size:.875rem}th{background:#f0f4f5;color:#536773;font-weight:normal;white-space:nowrap}th,td{padding:17px 18px;border-bottom:1px solid var(--line);max-width:350px;overflow-wrap:anywhere}td .actions{gap:6px;flex-wrap:nowrap}td .btn.small{white-space:nowrap;padding:7px 10px;font-weight:normal}tr:last-child td{border-bottom:0}.pagination{display:flex;justify-content:center;align-items:center;gap:20px;margin-top:22px}.loading{padding:70px;text-align:center;color:var(--muted)}dialog{border:0;padding:28px;border-radius:20px;width:min(650px,94vw);max-height:88vh;box-shadow:0 30px 100px #07172240;color:var(--ink)}dialog::backdrop{background:#10233099;backdrop-filter:blur(3px)}.dialog-head{display:flex;align-items:start;justify-content:space-between;gap:15px;margin-bottom:22px}.dialog-head h2{font-size:1.35rem;margin:0}#toast{position:fixed;bottom:25px;left:25px;max-width:90vw;padding:17px 23px;border-radius:12px;background:var(--ink);color:white;box-shadow:0 10px 30px #122d3b30;z-index:50}.chat{background:white;border:1px solid var(--line);border-radius:20px;overflow:hidden}.chat-feed{padding:25px;min-height:260px;max-height:55vh;overflow:auto}.bubble{white-space:pre-wrap;line-height:1.9;margin:15px 0;padding:18px 22px;border-radius:14px;max-width:90%;background:#edf4e8}.bubble.user{background:#edf0f4;margin-right:auto}.chat-form{padding:20px;border-top:1px solid var(--line);display:flex;align-items:end;gap:12px}.chat-form label{flex:1;margin:0}.chat-form textarea{min-height:65px}.breadcrumbs{font-size:.875rem;margin-bottom:18px;color:var(--teal)}.note{font-size:.875rem;color:var(--muted);line-height:1.8}.spaced{margin-top:22px}.row.between{justify-content:space-between}.inline-message{padding:15px;background:#eef5ea;border-radius:10px;margin-bottom:20px}.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}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;transform:none!important}}@media(max-width:1050px){.topbar{padding:0 24px}.topbar nav{gap:12px}.shell{grid-template-columns:190px minmax(0,1fr)}.workspace{padding:28px 24px}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero{gap:35px}.hero h1{font-size:3.5rem}.hero .lead{font-size:1rem}.journey{padding:28px}}@media(max-width:750px){.topbar{height:auto;min-height:78px;padding:13px 18px;gap:12px;flex-wrap:wrap}.brand img{width:124px;height:44px}.topbar nav{order:3;flex-basis:100%;justify-content:center;border-top:1px solid var(--line);padding-top:12px}.top-actions{gap:3px;font-size:.8rem}.top-actions .btn{padding:9px 13px}.hero{grid-template-columns:1fr;padding:45px 25px;gap:30px}.hero h1{font-size:3.4rem;letter-spacing:-2px}.journey{transform:none}.ribbon span{display:inline-block;margin:6px 10px}.section{padding:45px 22px}.section-head h2{font-size:1.6rem}.grid{grid-template-columns:1fr}.section-head,.cta{align-items:start;flex-direction:column}.auth-wrap{display:block;padding:25px 18px}.auth-story{position:static;padding:10px}.auth-story h1{font-size:2rem}.auth-story p{display:none}.auth-form{padding:25px}.shell{display:block}.sidebar{padding:10px 15px;display:flex;overflow:auto;border-bottom:1px solid var(--line);gap:5px}.sidebar .label,.sidebar .user-box{display:none}.sidebar a{white-space:nowrap;padding:10px 13px;margin:0}.workspace{padding:28px 18px}.banner{flex-direction:column;align-items:start;padding:23px}.stats{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.stat{padding:17px}.page-head{align-items:start}.page-head h1{font-size:1.5rem}.form-grid{grid-template-columns:1fr}.lesson-row{padding:16px;gap:10px;flex-wrap:wrap}.lesson-row .grow{min-width:180px}.tabs button{padding:13px 15px}.chat-form{flex-direction:column;align-items:stretch}.bubble{max-width:100%}.cta{padding:27px}.toolbar .search{min-width:200px}.section-head p{margin:0}.footer{padding:25px}.actions{gap:10px}}

.account-panel{max-width:620px;margin:0 auto}.account-panel form{display:grid;gap:16px}.account-panel h1{font-size:2rem}