:root{--bg:#f6f7fb;--surface:#fff;--ink:#17212f;--muted:#8190a5;--line:#e8ecf2;--blue:#3867f5;--purple:#8b72f5;--green:#42ba8b;--orange:#f6a648;--red:#eb6b72;--navy:#1d2a42}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:14px 'DM Sans',sans-serif}.app-shell{display:flex;min-height:100vh}.sidebar{width:258px;background:#fbfcff;border-right:1px solid var(--line);padding:27px 17px 18px;display:flex;flex-direction:column}.brand{font:700 25px 'Space Grotesk';letter-spacing:-1px;display:flex;align-items:center;gap:9px;padding:0 12px 38px}.brand-mark{width:29px;height:29px;background:var(--blue);border-radius:9px;color:white;display:grid;place-items:center;font-size:18px;box-shadow:0 5px 13px #3867f545}.role-switcher{position:relative;padding:0 12px 23px}.role-switcher>span,.nav-label{font-size:10px;letter-spacing:1.2px;font-weight:700;color:#a6b1c1}.role-toggle{border:1px solid var(--line);background:white;border-radius:9px;width:100%;padding:10px 11px;margin-top:7px;display:flex;align-items:center;gap:8px;color:var(--ink);font-weight:600;cursor:pointer}.role-dot{width:8px;height:8px;background:#47c58c;border-radius:50%;box-shadow:0 0 0 3px #47c58c1c}.chevron{margin-left:auto;color:#a8b3c4}.role-menu{display:none;position:absolute;z-index:5;top:70px;left:12px;right:12px;background:white;border:1px solid var(--line);box-shadow:0 12px 25px #19305018;border-radius:9px;padding:5px}.role-menu.open{display:block}.role-menu button{width:100%;background:none;border:0;text-align:left;padding:9px;border-radius:6px;cursor:pointer}.role-menu button:hover{background:#f1f4fa}.nav-label{padding:0 14px 9px}.nav-label.spaced{margin-top:27px}.nav-item{width:100%;border:0;background:transparent;color:#68788e;padding:11px 13px;border-radius:9px;display:flex;align-items:center;gap:12px;text-align:left;font:500 13px 'DM Sans';cursor:pointer;transition:.2s}.nav-item span{font-size:17px;width:16px;text-align:center;color:#95a2b5}.nav-item:hover{background:#f0f3fa;color:var(--ink)}.nav-item.active{background:#eaf0ff;color:var(--blue);font-weight:700}.nav-item.active span{color:var(--blue)}.nav-badge{font-size:10px;background:#e6edff;color:var(--blue);padding:3px 7px;border-radius:10px;margin-left:auto}.nav-badge.purple{color:#8065ed;background:#f0ebff}.nav-badge.orange{color:#da8a2b;background:#fff2df}.hidden{display:none}.sidebar-bottom{margin-top:auto;margin-bottom:21px;border-top:1px solid var(--line);padding:17px 8px 0;display:flex;align-items:center;gap:9px}.support-dot{width:30px;height:30px;background:#eef3ff;border-radius:9px}.sidebar-bottom strong,.sidebar-bottom small{display:block}.sidebar-bottom strong{font-size:11px}.sidebar-bottom small{color:var(--muted);font-size:10px;margin-top:2px}.sidebar-bottom>span{margin-left:auto;color:var(--blue);font-size:18px}.user-mini{border-top:1px solid var(--line);padding:16px 8px 0;display:flex;gap:9px;align-items:center}.avatar{width:34px;height:34px;border-radius:50%;background:#ffd9b8;color:#955d31;display:grid;place-items:center;font-weight:700;font-size:11px}.user-mini strong,.user-mini small{display:block;font-size:11px;line-height:1.25}.user-mini small{color:var(--muted);margin-top:3px;font-size:10px}.user-mini>span{margin-left:auto;color:#aeb8c7}.main{flex:1;min-width:0}.topbar{height:73px;border-bottom:1px solid var(--line);background:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 43px}.breadcrumbs{font-size:12px;color:#9ba8b9}.breadcrumbs span{padding:0 8px;color:#cad0db}.breadcrumbs b{color:#536177}.top-actions{display:flex;align-items:center;gap:15px}.icon-btn,.help{border:0;background:transparent;color:#78869a;font-size:19px;cursor:pointer}.notification{position:relative}.notification i{position:absolute;width:5px;height:5px;background:var(--orange);border-radius:50%;top:0;right:0}.help{border:1px solid var(--line);border-radius:50%;font-size:12px;width:22px;height:22px}.content{padding:36px 43px 50px;max-width:1450px}.eyebrow{font-size:11px;color:var(--blue);font-weight:700;letter-spacing:1.4px;text-transform:uppercase}.page-title{font:600 31px 'Space Grotesk';letter-spacing:-1.2px;margin:6px 0}.page-subtitle{color:var(--muted);margin:0 0 28px}.hero{background:var(--navy);color:#fff;border-radius:18px;padding:28px 32px;display:flex;justify-content:space-between;align-items:center;min-height:184px;overflow:hidden;position:relative}.hero:after{content:'';position:absolute;width:370px;height:370px;border:1px solid #ffffff14;border-radius:50%;right:80px;top:-155px;box-shadow:0 0 0 35px #ffffff08,0 0 0 70px #ffffff04}.hero-copy{position:relative;z-index:1}.hero h2{font:500 25px 'Space Grotesk';margin:7px 0 10px}.hero p{color:#b5c1d7;margin:0;max-width:470px;line-height:1.5}.hero .mini-label{color:#8da6d9}.hero-btn{position:relative;z-index:1;background:#fff;color:var(--navy);border:0;border-radius:8px;padding:11px 15px;font-weight:700;cursor:pointer}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:20px}.stat-card,.panel{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:21px}.stat-card{display:flex;align-items:center;gap:15px}.stat-icon{width:43px;height:43px;border-radius:12px;display:grid;place-items:center;font-size:20px}.stat-icon.blue{background:#edf2ff;color:var(--blue)}.stat-icon.purple{background:#f1edff;color:#856cf2}.stat-icon.green{background:#e8f8f1;color:#38ad81}.stat-card strong{font:700 24px 'Space Grotesk';display:block}.stat-card span{font-size:11px;color:var(--muted)}.section-row{display:flex;justify-content:space-between;align-items:center;margin:31px 0 14px}.section-row h3{font:600 17px 'Space Grotesk';margin:0}.link{color:var(--blue);font-size:12px;border:0;background:none;cursor:pointer}.two-col{display:grid;grid-template-columns:1.3fr .7fr;gap:17px}.panel-head{display:flex;justify-content:space-between;align-items:start;margin-bottom:17px}.panel-head h3{font:600 15px 'Space Grotesk';margin:0}.panel-head p{color:var(--muted);font-size:11px;margin:5px 0}.progress-row{display:flex;align-items:center;gap:12px;margin:15px 0}.progress-row .label{width:130px;font-size:12px}.bar{height:7px;background:#edf0f5;border-radius:10px;flex:1;overflow:hidden}.bar i{height:100%;display:block;border-radius:10px;background:var(--blue)}.bar i.green{background:var(--green)}.bar i.purple{background:var(--purple)}.percent{color:#63738a;font-size:11px;width:31px;text-align:right}.task{display:flex;align-items:center;padding:12px 0;border-bottom:1px solid #f0f2f6;gap:11px}.task:last-child{border-bottom:0}.task-icon{width:30px;height:30px;border-radius:9px;display:grid;place-items:center;background:#f0f4ff;color:var(--blue)}.task strong{display:block;font-size:12px}.task small{display:block;color:var(--muted);margin-top:3px;font-size:10px}.status{margin-left:auto;font-size:10px;padding:5px 8px;border-radius:12px;background:#eaf9f3;color:#38a980}.status.pending{background:#fff4e5;color:#da912f}.table{width:100%;border-collapse:collapse;font-size:12px}.table th{text-align:left;color:#9aa7b8;font-weight:500;font-size:10px;padding:10px 8px;border-bottom:1px solid var(--line)}.table td{padding:13px 8px;border-bottom:1px solid #f0f2f6}.table tr:last-child td{border-bottom:0}.pill{display:inline-flex;align-items:center;gap:5px;padding:5px 8px;border-radius:12px;background:#fff3e3;color:#d48b2c;font-size:10px}.pill:before{content:'';width:5px;height:5px;border-radius:50%;background:currentColor}.pill.green{background:#e9f8f1;color:#3aad80}.pill.red{background:#fff0f1;color:#dd6870}.btn{border:0;background:var(--blue);color:white;border-radius:8px;padding:10px 14px;font-weight:700;font-size:11px;cursor:pointer}.btn.secondary{background:#f0f3f8;color:#63738a}.btn.ghost{background:white;border:1px solid var(--line);color:#63738a}.toolbar{display:flex;gap:9px;align-items:center}.search{border:1px solid var(--line);border-radius:8px;background:white;padding:10px 12px;color:#8896a9;min-width:210px}.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:13px}.metric{background:white;border:1px solid var(--line);border-radius:12px;padding:17px}.metric small{color:var(--muted)}.metric strong{display:block;font:700 26px 'Space Grotesk';margin:5px 0}.metric 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@media(max-width:900px){.sidebar{width:215px}.content{padding:28px 22px}.topbar{padding:0 22px}.grid,.metric-grid{grid-template-columns:1fr 1fr}.two-col{grid-template-columns:1fr}}@media(max-width:650px){.sidebar{width:63px;padding:20px 8px}.brand{padding:0 9px 30px}.brand span,.role-switcher,.nav-label,.nav-item:not(.active)::after,.nav-item{font-size:0}.nav-item{justify-content:center;padding:12px}.nav-item span{font-size:18px}.nav-badge{display:none}.sidebar-bottom,.user-mini{display:none}.topbar{height:60px}.breadcrumbs{white-space:nowrap;overflow:hidden}.content{padding:24px 15px}.hero{padding:23px;display:block}.hero-btn{margin-top:20px}.grid,.metric-grid{grid-template-columns:1fr}.page-title{font-size:26px}}
.auth-screen{min-height:100vh;background:#f4f7ff;display:grid;place-items:center;position:relative;overflow:hidden}.auth-card{position:relative;z-index:1;width:min(430px,calc(100% - 32px));background:#fff;border:1px solid #e6ebf5;border-radius:20px;padding:36px 38px 30px;box-shadow:0 25px 70px #243c7012}.auth-brand{padding:0 0 43px;font-size:23px}.auth-kicker{font-size:10px;letter-spacing:1.6px;color:var(--blue);font-weight:700}.auth-card h1{font:600 28px 'Space Grotesk';letter-spacing:-1px;margin:9px 0 8px}.auth-intro{color:var(--muted);line-height:1.55;margin:0 0 25px}.auth-card label{display:block;font-size:11px;font-weight:700;color:#55657d;margin-bottom:7px}.phone-field{display:flex;align-items:center;border:1px solid #dfe5ef;border-radius:9px;height:45px;padding:0 13px;transition:.2s}.phone-field:focus-within{border-color:var(--blue);box-shadow:0 0 0 3px #3867f514}.phone-field span{font-weight:700;color:#34435a;padding-right:8px;border-right:1px solid #e6ebf2}.phone-field input{border:0;outline:0;width:100%;height:100%;padding-left:10px;font:14px 'DM Sans';color:var(--ink)}.phone-field input::placeholder{color:#b1bac7}.auth-submit{width:100%;height:45px;margin-top:8px;font-size:12px;display:flex;justify-content:center;gap:15px}.auth-submit span{font-size:17px;line-height:10px}.auth-error{min-height:19px;padding-top:6px;color:#d56870;font-size:11px}.auth-note{border-top:1px solid #eef1f6;margin-top:24px;padding-top:17px;color:#9aa6b7;font-size:10px;text-align:center}.auth-note span{color:#9aaef2;margin-right:4px}.demo-link{display:block;border:0;background:none;color:var(--blue);font-size:11px;margin:22px auto 0;cursor:pointer}.auth-footer{position:absolute;bottom:19px;color:#a9b3c3;font-size:10px}.auth-glow{position:absolute;width:420px;height:420px;border-radius:50%;filter:blur(2px);opacity:.55}.glow-one{background:#dce8ff;left:-120px;top:-90px}.glow-two{background:#eee5ff;right:-130px;bottom:-110px}
.modal-backdrop{display:none;position:fixed;inset:0;background:#16243b66;z-index:20;align-items:center;justify-content:center;padding:20px}.modal-backdrop.visible{display:flex}.modal{width:min(440px,100%);background:#fff;border-radius:16px;padding:28px;box-shadow:0 25px 80px #16243b38;position:relative}.modal-close{position:absolute;top:14px;right:16px;border:0;background:none;color:#9aa7b9;font-size:24px;cursor:pointer}.modal h2{font:600 22px 'Space Grotesk';margin:7px 0}.modal p{color:var(--muted);font-size:12px;margin:0 0 21px}.modal label{display:block;color:#64748b;font-size:11px;font-weight:700;margin-top:13px}.modal input,.modal select{display:block;width:100%;height:40px;border:1px solid #dfe5ef;border-radius:8px;margin-top:6px;padding:0 10px;color:var(--ink);background:#fff;font:13px 'DM Sans';outline:0}.modal input:focus,.modal select:focus{border-color:var(--blue)}.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:23px}.form-error{color:#d56870;font-size:11px;min-height:15px;margin-top:10px}
.editor-title{font:600 24px 'Space Grotesk';margin:7px 0}.assignment-instruction{background:#f7f9fd;border:1px solid #e9edf5;border-radius:10px;padding:15px;margin:22px 0}.assignment-instruction strong{font-size:12px}.assignment-instruction p{font-size:12px;color:#62728a;line-height:1.55;margin:7px 0 0}.answer-label{display:flex;justify-content:space-between;font-size:11px;font-weight:700;color:#53657d;margin-bottom:7px}.answer-label span{font-weight:500;color:var(--green)}.answer-editor{width:100%;height:260px;resize:vertical;border:1px solid #dfe5ef;border-radius:10px;padding:14px;outline:0;color:var(--ink);font:13px/1.6 'DM Sans'}.answer-editor:focus{border-color:var(--blue);box-shadow:0 0 0 3px #3867f514}.editor-foot{display:flex;justify-content:space-between;align-items:center;color:#9aa6b7;font-size:10px;margin-top:13px}.privacy-card{margin-top:15px;background:#fafbff}.privacy-card p{font-size:11px;color:#65748b;line-height:1.5;margin:10px 0}.privacy-card small{color:#a0adbe;font-size:10px;line-height:1.45;display:block}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.review-list{margin-top:7px}.review-item{width:100%;display:flex;align-items:center;gap:10px;border:0;border-bottom:1px solid #eef1f6;background:#fff;padding:13px 0;text-align:left;cursor:pointer}.review-item.active{background:#f1f5ff;margin:0 -21px;padding-left:21px;padding-right:21px;width:calc(100% + 42px);border-left:3px solid var(--blue)}.review-item .avatar{flex:none}.review-item strong,.review-item small{display:block}.review-item strong{font-size:12px}.review-item small{color:var(--muted);font-size:10px;margin-top:3px}.review-item>span{margin-left:auto;color:#a1adbc;font-size:10px}.avatar.lilac{background:#e7ddff;color:#7256c6}.avatar.mint{background:#d8f4ea;color:#2c9b75}.submission-meta{display:flex;align-items:center;gap:10px;color:#8794a6;font-size:10px;margin:9px 0 19px}.student-answer{background:#f8fafd;border:1px solid #e8edf4;border-radius:10px;padding:16px;font-size:12px;line-height:1.65;color:#4e5e74}.history-toggle{border:0;background:none;padding:14px 0;color:var(--blue);font-size:11px;cursor:pointer}.review-history{display:none;border-left:2px solid #dbe5ff;padding:3px 0 3px 14px;color:#718198;font-size:10px;line-height:2}.review-history.visible{display:block}.grading{border-top:1px solid var(--line);margin-top:17px;padding-top:17px}.grading label{font-size:11px;color:#63738a;font-weight:700;display:block;margin-bottom:11px}.score-field{display:flex;align-items:center;gap:7px;margin-top:6px}.score-field input{width:65px;height:34px;border:1px solid #dfe5ef;border-radius:7px;padding:0 8px;font-weight:700}.score-field span{color:#a1adbb;font-weight:500}.grading textarea{display:block;width:100%;height:70px;border:1px solid #dfe5ef;border-radius:8px;resize:vertical;margin-top:6px;padding:9px;font:12px 'DM Sans';outline:0}.review-actions{display:flex;justify-content:flex-end;gap:8px}.review-layout{grid-template-columns:.7fr 1.3fr}
.activity-chart{height:125px;display:flex;align-items:end;gap:10px;border-bottom:1px solid #e9edf4;padding:0 9px}.activity-chart i{display:block;flex:1;max-width:25px;background:#8b72f5;border-radius:5px 5px 0 0}.chart-labels{display:flex;justify-content:space-around;color:#a3afbf;font-size:9px;padding-top:8px}.variant-panel{padding:17px 22px}.variant-row{display:grid;grid-template-columns:24px 1fr 42px 125px;align-items:center;gap:13px;padding:10px 0;border-bottom:1px solid #f0f2f6}.variant-row:last-child{border:0}.variant-row>b{font:700 14px 'Space Grotesk'}.variant-row strong{font-size:12px}.variant-row small{color:#91a0b2;font-size:10px}.variant-row.warning{background:#fffaf2;margin:0 -12px;padding-left:12px;padding-right:12px;border-radius:7px}.variant-row.warning small{color:#d48b2c}
.lab-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:15px}.lab-tab{border:1px solid var(--line);background:#fff;color:#68788e;border-radius:8px;padding:9px 12px;font-size:11px;cursor:pointer}.lab-tab.active{background:#eaf0ff;border-color:#cbd8ff;color:var(--blue);font-weight:700}.table-dot.purple{background:#9b87f6}
.quiz-card{max-width:820px}.quiz-options{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:25px 0 12px}.quiz-options button{background:#fff;border:1px solid #dfe5ef;border-radius:9px;padding:15px;text-align:left;color:#53657d;font:13px 'DM Sans';cursor:pointer}.quiz-options button:hover,.quiz-options button.selected{border-color:var(--blue);background:#eef3ff;color:var(--blue)}.quiz-feedback{min-height:25px;font-size:12px;font-weight:600}.quiz-feedback.correct{color:var(--green)}.quiz-feedback.wrong,.quiz-feedback.error{color:var(--red)}.lab-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:24px 0}.lab-step{border:1px solid var(--line);background:#fff;border-radius:9px;padding:11px;text-align:left;color:#8896a9;cursor:pointer}.lab-step b{display:block;font-size:10px;color:#b1bdcb}.lab-step span{font-size:11px}.lab-step.active{border-color:var(--blue);background:#eef3ff;color:var(--blue)}.lab-step.active b{color:var(--blue)}.lab-stage{background:#f7f9fd;border:1px solid #e7ecf4;border-radius:12px;padding:34px;text-align:center}.lab-stage h3{font:600 17px 'Space Grotesk';margin:17px 0 7px}.lab-stage p{color:var(--muted);font-size:12px;margin:0 0 20px}.dataset-preview{display:flex;justify-content:center;gap:12px}.table-dot{width:30px;height:30px;border-radius:7px}.table-dot.green{background:#70d1a9}.table-dot.red{background:#f28b91}.table-dot.orange{background:#f5bd6d}