/* Classroom theme: clear lesson hierarchy, notebook surfaces and subject illustrations. */
:root{--green:#6252b8;--muted:#70748d;--line:#e6e5f0;--paper:#fff;--orange:#e39b3a;color:#30364f;background:#f8f9fd;font-family:"Segoe UI",Arial,sans-serif}
body{background:#f8f9fd}.sidebar{width:auto;background:#fff;padding:30px 22px;border-right:1px solid #e9e8f3}.shell{grid-template-columns:250px 1fr}.brand{gap:12px;color:#353050}.brand-icon{background:#7160c4;width:46px;height:46px;border-radius:15px;box-shadow:0 4px 0 #e3dff4}.brand-icon svg{width:27px;height:27px}.brand small{font-size:10px;letter-spacing:1.8px;color:#82799f}.brand strong{font-size:18px;letter-spacing:-.5px}.nav-label{font-size:10px;color:#9a96ac}.nav-btn{padding:13px 14px;border-radius:11px;color:#75758b;font-size:13px;font-weight:500;gap:13px;transition:background .16s}.nav-btn.active{background:#efebfc;color:#6550b1;box-shadow:inset 3px 0 #8c78d3}.nav-btn:hover{background:#f6f3fd}.nav-icon{display:flex;align-items:center;justify-content:center;width:21px}.nav-icon svg{width:20px;height:20px}.side-note{background:#fff8e7;border:1px solid #f3e9c7;border-radius:12px;transform:rotate(-1deg);padding:22px 16px 16px;color:#8c7852;position:relative;line-height:1.9}.side-note:before{content:'';position:absolute;width:50px;height:14px;background:#ded4efb0;top:-7px;left:calc(50% - 25px);transform:rotate(-5deg)}.side-note strong{color:#78613e;font-size:13px;margin-bottom:5px}.avatar{background:#eee8fb;color:#7461b8}.profile{border-color:#eeebf5}.topbar{height:73px;background:#fff;padding:0 38px;font-size:12px;color:#8b869e}.topbar strong{color:#59516f}.topbar .btn{border:1px solid #e6e0f5;background:#f7f4fe;color:#7761b3}.main{padding:33px 38px 45px;max-width:1370px}.eyebrow{color:#8d82b4;letter-spacing:1.5px;font-size:10px}.page-head{margin-bottom:23px}.page-head h1{font-size:28px;font-weight:750;color:#33344e;letter-spacing:-.7px}.page-head p{font-size:13px;color:#828198}.hero{background:#eeeafb;background-image:radial-gradient(circle at 91% 12%,#f6f1ff 0, #f6f1ff 80px,transparent 81px);color:#3f365c;border:1px solid #e4ddf6;border-radius:20px;padding:31px 34px;grid-template-columns:1.2fr 1fr;min-height:275px;gap:10px;margin-bottom:24px;overflow:hidden}.hero .eyebrow{display:inline-block;color:#7b62aa;background:#fff9;padding:7px 12px;border-radius:7px;font-size:10px;letter-spacing:1.1px}.hero h2{font-family:"Segoe UI",Arial,sans-serif;font-weight:750;font-size:34px;line-height:1.3;letter-spacing:-1px;color:#443560;margin:16px 0 10px}.hero p{color:#81728e;font-size:13px;line-height:1.85}.hero .btn{background:#7760c1;color:#fff;box-shadow:0 4px 0 #d6ccee;margin-top:6px}.hero-art{max-height:250px;width:100%;overflow:visible}.btn{background:#7460bd;border-radius:9px;padding:11px 18px;font-weight:650;font-size:13px;transition:transform .15s,background .15s}.btn:hover{filter:none;background:#6651af;transform:translateY(-1px)}.btn.secondary{border-color:#e2dcef;background:#fff;color:#7863b3}.btn.secondary:hover{background:#f8f5ff}.btn.soft{background:#eee9fb;color:#7860b4}.btn.danger{background:#b65d59}.pill{background:#edf6ee;color:#598866;font-weight:600;font-size:10px;padding:6px 10px}.pill.orange{background:#fff1d7;color:#9c7831}.pill.blue{background:#eaf0fc;color:#627db0}.stats{gap:18px;margin-bottom:25px}.stat{border:1px solid #e9e5f0;border-radius:14px;padding:19px 20px;box-shadow:0 3px 0 #f0edf6;gap:14px}.stat-icon{width:45px;height:45px;border-radius:13px;background:#eee9fc;color:#9275ca;font-size:23px}.stat:nth-child(2) .stat-icon{background:#fff0d8;color:#d4a358}.stat:nth-child(3) .stat-icon{background:#e7f4ee;color:#70a78c}.stat strong{font-size:24px;font-weight:750;color:#4c4962}.stat small{font-size:11px;color:#8b869b}.two-col{gap:23px;grid-template-columns:minmax(0,1.7fr) minmax(270px,1fr)}.card{border:1px solid #e8e5ef;border-radius:15px;padding:25px;background:#fff;box-shadow:0 3px 0 #f1eff6}.card h2,.section-title{font-size:17px;color:#48425e;font-weight:700}.card h3{color:#56506b}.card-top{margin-bottom:18px}.muted{color:#898398;line-height:1.8}.step{position:relative;border:0;padding:18px 13px;margin:4px -6px;border-radius:12px;gap:14px}.step.current{background:#f6f2ff;border:1px solid #e9e0fb}.step-num{width:36px;height:36px;border-radius:12px;background:#f3f2f7;color:#a29bb1;border:0;font-weight:700;font-size:13px;position:relative}.step.current .step-num{background:#967bcd;border:0;box-shadow:0 3px 0 #e1d4f3}.step.done .step-num{background:#e8f4ec;color:#6d9c7c;border:0}.step h3{font-size:13px;color:#5a506d;margin-top:2px}.step p{font-size:12px;color:#9890a4;line-height:1.8}.step .pill{background:#eee7fa;color:#967ab8;margin-top:4px}.skill{border-color:#f0edf5;padding:18px 0}.skill-row{font-size:12px;color:#655d79;flex-wrap:wrap}.skill-row .muted{font-size:10px}.track{height:7px;background:#f3f0f8;margin-top:13px}.track span{background:#a78bd2}.skill:nth-of-type(2) .track span{background:#e4bb78}.skill:nth-of-type(3) .track span{background:#91bca1}.notice{background:#fffaed;border-left:3px solid #e9c681;color:#8c7955;border-radius:0 10px 10px 0;font-size:12px}.notice.error{background:#fff0ee;color:#a16157;border-color:#dd9b8f}.formula{background-color:#f9f8ff;background-image:linear-gradient(#eae5f455 1px,transparent 1px),linear-gradient(90deg,#eae5f455 1px,transparent 1px);background-size:22px 22px;border:1px solid #ebe5f7;color:#7560a2;font-size:30px;padding:30px;border-radius:12px}.question-tabs{gap:12px}.question-tab{border-color:#e5dff0;color:#9a8eaa;font-weight:600;border-radius:10px;padding:12px 17px}.question-tab.active{background:#8b70bf;border-color:#8b70bf;color:#fff;box-shadow:0 3px 0 #e2d7f2}.question-tab.done{background:#eef6f0;color:#71957a;border-color:#ddebe1}label{color:#726580;font-size:12px}input,textarea,select{border:1px solid #e5dfee;border-radius:9px;padding:12px;color:#53485f;background:#fefeff}textarea{background-image:linear-gradient(transparent 31px,#f2eef7 32px);background-size:100% 32px;line-height:32px;padding-top:3px;min-height:105px}input:focus,textarea:focus,select:focus{border-color:#b49ad4;outline-color:#dccdf2}input[type=range]{accent-color:#9679c5}.evidence{border:1px solid #e8e2ef;background:#faf8fd;border-radius:11px}.evidence.original{border-left:3px solid #a492c9}.evidence.revision{border-left:3px solid #e4bd7e;background:#fffcf5}.evidence h4{color:#867295}.prose{color:#6f627c;font-size:13px;line-height:1.9}.rubric{background:#f6f2fc;color:#8a779d;border:1px solid #e9e0f5;border-radius:10px}.graph{border-color:#e6e1f0;background:#fbfaff}.table-wrap{border:1px solid #efebf4;border-radius:10px}th{background:#f8f5fc;color:#998aa9}th,td{border-color:#f1edf6;padding:15px 12px}td{color:#786986}tbody tr:hover{background:#fcfaff}.timeline{border-color:#e8def3}.timeline .event:before{background:#b49bcf}summary{color:#8971a3}.footer{color:#a89ab5;border-top:1px dashed #e7dfef;padding-top:20px}.login{background:#fff;grid-template-columns:1.15fr 1fr}.login-story{background-color:#f0ebfa;background-image:radial-gradient(#d5c9e9 1px,transparent 1px);background-size:22px 22px;color:#49385f;padding:55px clamp(35px,6vw,100px);position:relative;overflow:hidden}.login-story .brand{color:#56406d}.login-story .brand small{color:#9c85b3}.login-story .brand-icon{background:#9677bd;color:white;box-shadow:0 4px 0 #ddd0ed}.login-story h1{font-family:"Segoe UI",Arial,sans-serif;font-size:43px;line-height:1.3;font-weight:750;letter-spacing:-1.4px;margin:42px 0 16px;color:#604773}.login-story>p{color:#9a83aa;line-height:1.9;font-size:14px;margin:0 0 12px}.login-story>.hero-art{max-height:290px;margin-top:8px}.login-story>p:last-child{margin-top:24px;font-size:11px;color:#aa96b8}.login-form{background:#fffdfa;padding:45px}.login-panel{max-width:390px}.login-panel .eyebrow{background:#f6edff;color:#9c7db6;display:inline-block;padding:7px 10px;border-radius:7px;letter-spacing:1px}.login-panel h2{font-size:29px;color:#655076;letter-spacing:-.6px;margin:19px 0 9px}.login-panel>.muted{margin-bottom:27px;font-size:13px;color:#a18ea9}.login-panel .form-grid{gap:17px}.login-panel input{background:#fff;border-color:#e9dfef;padding:14px}.login-panel .btn{padding:14px;box-shadow:0 4px 0 #e9ddf4;background:#9978be}.login-panel .notice{background:#fff8e9;border-color:#edc98c;color:#b49a6b;font-size:11px;margin-top:28px}.demo-accounts button{border:1px solid #ede3f2;background:#fcf9ff;color:#a68ab6;font-size:11px;border-radius:8px;min-height:38px}.demo-accounts button:hover{background:#f0e6fa}.login-footer{border-top:1px dashed #e9dfef;padding-top:18px;color:#b2a0bc;font-size:10px;line-height:1.9}.login-error{margin:0}.lesson-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:0 0 25px}.lesson-link{text-align:left;border:1px solid #e8e0f1;background:#fff;border-radius:12px;padding:17px 14px;display:flex;gap:11px;align-items:center;color:#857096;transition:transform .15s}.lesson-link:hover{transform:translateY(-2px);background:#fcf8ff}.lesson-symbol{width:38px;height:38px;display:grid;place-items:center;background:#f2eafa;border-radius:10px;font:23px Georgia;color:#a387bf;flex-shrink:0}.lesson-link:nth-child(2) .lesson-symbol{background:#fff1dd;color:#d7ac6b}.lesson-link:nth-child(3) .lesson-symbol{background:#eaf5ef;color:#8ab49b}.lesson-link strong{display:block;font-size:12px;color:#867094}.lesson-link small{display:block;font-size:10px;color:#af9bb9;margin-top:4px}.lesson-link .arrow{margin-left:auto;font-size:17px;color:#bca6ca}#toast{background:#8265a5;box-shadow:0 6px 25px #8265a526}.classroom-caption{display:flex;justify-content:center;gap:8px;align-items:center;font-size:10px;color:#a58ab6;margin-top:5px}
/* Readable text contrast on the pastel classroom surfaces. */
.muted,.step p,.stat small,.page-head p{color:#736b83}.side-note{color:#756344}.skill-row .muted{color:#786e89}.login-story>p{color:#796389}.login-story>p:last-child{color:#806d90}.login-panel>.muted{color:#82708d}.login-panel .notice{color:#8b744b}.login-footer{color:#897592}.demo-accounts button{color:#846097}.lesson-link strong{color:#755783}.lesson-link small{color:#8a7297}.footer{color:#897697}
@media(min-width:1500px){.main{padding:40px 48px}.hero{min-height:300px}.hero h2{font-size:38px}}
@media(max-width:1100px){.shell{grid-template-columns:215px 1fr}.sidebar{padding:25px 16px}.main{padding:28px 25px}.two-col{grid-template-columns:1fr}.hero{padding:28px;grid-template-columns:1.1fr 1fr}.hero h2{font-size:29px}.brand strong{font-size:15px}.lesson-link{padding:13px 10px;gap:8px}.lesson-link .arrow{display:none}.lesson-symbol{width:32px;height:32px}.login-story{padding:45px}.login-story h1{font-size:36px}}
@media(max-width:720px){.shell{display:block}.sidebar{padding:17px 16px;gap:18px}.nav-btn{font-size:11px;padding:11px 10px}.nav-icon svg{width:17px;height:17px}.main{padding:24px 18px}.topbar{padding:0 18px;height:55px}.topbar>span{max-width:62%;font-size:10px;line-height:1.7}.topbar .btn{font-size:10px;padding:7px 9px}.hero{display:block;padding:25px;border-radius:16px;min-height:0}.hero h2{font-size:29px}.hero>svg{display:block;max-height:190px;margin:15px auto 0}.page-head h1{font-size:24px}.stats{gap:9px}.stat{padding:15px 10px}.stat strong{font-size:23px}.stat small{font-size:10px;line-height:1.6}.lesson-strip{gap:7px}.lesson-link{display:block;padding:13px 10px}.lesson-symbol{margin-bottom:10px}.lesson-link strong{font-size:10px;line-height:1.6}.lesson-link small{font-size:9px;line-height:1.5}.card{padding:21px}.step{padding:15px 8px}.login{display:block}.login-story{padding:30px 28px 18px}.login-story h1{font-size:30px;margin:26px 0 15px}.login-story>p{display:block;font-size:12px}.login-story>.hero-art{display:none}.login-story>p:last-child{display:none}.login-form{padding:32px 25px 40px}.login-panel h2{font-size:27px}.brand strong{font-size:17px}.footer{font-size:10px}.formula{font-size:25px;padding:24px 12px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}.btn:hover,.lesson-link:hover{transform:none}}
@media print{body,.hero,.login-story{background:white!important;color:black!important}.card{box-shadow:none}.lesson-strip{display:none}.prose,.muted{color:#333}.formula{background:white;border-color:#bbb;color:black}.hero-art{display:none!important}}