@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{--ink:#172436;--muted:#64748b;--line:#dbe3ee;--paper:#fff;--bg:#f5f7fb;--blue:#4967e8;--blue-dark:#334dcc;--mint:#18a88f;--soft:#eef2ff;--shadow:0 16px 44px rgba(31,47,79,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:'DM Sans',system-ui,sans-serif;font-size:15px;line-height:1.55}a{color:inherit}.topbar{height:78px;display:flex;align-items:center;justify-content:space-between;padding:0 max(5vw,24px);background:rgba(255,255,255,.9);border-bottom:1px solid #e4eaf2;position:sticky;top:0;z-index:10;backdrop-filter:blur(14px)}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;font:800 20px Manrope,sans-serif;letter-spacing:-.8px;color:#253550}.brand-mark{width:36px;height:36px;display:grid;place-items:center;border-radius:12px;background:#4967e8;color:white;font:800 19px Manrope;box-shadow:0 7px 16px #4967e83b}.brand-light{font-weight:500;color:#52627a}.brand small{display:block;font:600 9px 'DM Sans',sans-serif;letter-spacing:1.2px;text-transform:uppercase;color:#8b98aa;margin-top:-3px}.topbar nav{display:flex;align-items:center;gap:8px}.topbar nav a{display:inline-flex;align-items:center;min-height:40px;padding:0 15px;border:1px solid transparent;border-radius:11px;text-decoration:none;font-size:13px;font-weight:700;color:#536176;transition:.18s}.topbar nav a:hover{background:#f1f4fa;color:var(--blue)}.topbar nav .nav-cta{background:#4967e8;color:#fff;box-shadow:0 7px 15px #4967e832}.topbar nav .nav-cta:hover{background:var(--blue-dark);color:#fff}main{min-height:calc(100vh - 150px);padding:0 5vw 70px}.hero{max-width:1160px;margin:0 auto;padding:92px 0 62px;position:relative}.hero:after{content:'</>';position:absolute;right:7%;top:80px;width:260px;height:230px;border-radius:45% 55% 57% 43%;background:linear-gradient(145deg,#e4eaff,#e5fbf6);display:grid;place-items:center;color:#8ca0ee;font:800 72px monospace;opacity:.72;z-index:-1;transform:rotate(-7deg)}.eyebrow{font-size:11px;font-weight:800;color:#4967e8;letter-spacing:1.5px;text-transform:uppercase}.hero h1{font:800 clamp(42px,6vw,72px)/1.06 Manrope,sans-serif;letter-spacing:-3.5px;margin:18px 0 20px;max-width:730px}.hero h1 em{font-style:normal;color:var(--blue)}.hero>p{max-width:620px;color:#65748a;font-size:17px;margin:0}.hero-actions{display:flex;gap:12px;margin-top:30px;flex-wrap:wrap}.button{border:0;display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:46px;padding:0 19px;border-radius:12px;font:700 14px 'DM Sans',sans-serif;text-decoration:none;cursor:pointer;transition:transform .18s,box-shadow .18s,background .18s}.button:hover{transform:translateY(-2px)}.button.primary{background:var(--blue);color:#fff;box-shadow:0 9px 20px #4967e832}.button.primary:hover{background:var(--blue-dark)}.button.quiet{background:#fff;border:1px solid var(--line);color:#43536b}.button.light{background:#fff;color:#354dcc}.button.small{min-height:34px;padding:0 12px;font-size:12px}.button.full{width:100%}.hero-note{margin-top:18px;color:#8793a5;font-size:12px}.catalog{max-width:1160px;margin:0 auto;padding:30px 0 76px}.section-head{display:flex;align-items:end;justify-content:space-between;margin-bottom:23px}.section-head h2,.teacher-callout h2{font:800 30px/1.2 Manrope,sans-serif;letter-spacing:-1px;margin:7px 0}.section-head>span{color:#75849b;font-size:13px}.task-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:17px}.task-card{background:#fff;border:1px solid #e0e6ef;border-radius:18px;padding:22px;box-shadow:0 7px 22px #263a5a08;display:flex;flex-direction:column;min-height:245px}.task-meta{display:flex;justify-content:space-between;align-items:center;color:#8390a2;font-size:11px;font-weight:700}.task-number{display:grid;place-items:center;background:#edf1ff;color:#4967e8;border-radius:9px;width:32px;height:30px;font:800 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var(--line);border-radius:18px;color:#718097}.empty strong{display:block;color:var(--ink);font:750 20px Manrope}.empty p{margin:8px auto 0;max-width:500px}.auth-wrap{min-height:calc(100vh - 230px);display:grid;place-items:center;padding:45px 15px}.auth-card{width:min(100%,460px);padding:34px;background:#fff;border:1px solid var(--line);border-radius:21px;box-shadow:var(--shadow)}.auth-card .back-link{display:inline-block;margin-bottom:28px}.auth-card h1,.dashboard-head h1,.page-title h1{font:800 31px/1.2 Manrope,sans-serif;letter-spacing:-1px;margin:9px 0}.auth-card>p,.dashboard-head p,.page-title>p{color:#748198;margin:0 0 24px}.auth-card form,.stack-form,.task-form{display:grid;gap:14px}.auth-card label,.stack-form label,.task-form label,.inline-form label{display:grid;gap:6px;color:#4b5c73;font-weight:700;font-size:12px}.auth-card input,.stack-form input,.task-form input,.task-form textarea,.inline-form input,.inline-form select,.inline-form label input{width:100%;border:1px solid #dce3ee;border-radius:10px;padding:11px 12px;font:500 14px 'DM Sans',sans-serif;color:var(--ink);background:#fff;outline:0}.auth-card input:focus,.stack-form input:focus,.task-form input:focus,.task-form textarea:focus,.inline-form input:focus,.inline-form select:focus{border-color:#8295f5;box-shadow:0 0 0 3px #4967e81a}.auth-switch{text-align:center;color:#7a8799;font-size:13px;margin-top:19px}.auth-switch a{color:#4967e8;font-weight:800;text-decoration:none}.flash{max-width:1160px;margin:16px auto 0;padding:12px 16px;border-radius:11px;font-weight:700;font-size:13px}.flash.success{background:#e8faf3;color:#08785d;border:1px solid #b8ead8}.flash.error{background:#fff1f0;color:#b42318;border:1px solid #ffd4d1}.dashboard,.student-dashboard{max-width:1160px;margin:0 auto;padding-top:42px}.dashboard-head{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:26px}.dashboard-head p{margin:5px 0}.dashboard-grid{display:grid;grid-template-columns:260px 1fr;gap:18px;align-items:start}.side-card,.panel{background:#fff;border:1px solid var(--line);border-radius:17px;padding:20px;box-shadow:0 7px 22px #263a5a08;margin-bottom:16px}.side-card h2,.panel h2{font:750 18px Manrope;margin:0}.class-row{display:flex;justify-content:space-between;padding:11px 12px;border-radius:10px;color:#536176;text-decoration:none;font-size:13px;font-weight:700;margin:8px 0}.class-row:hover,.class-row.selected{background:#eef2ff;color:#405de0}.stack-form{border-top:1px solid #edf0f5;margin-top:18px;padding-top:16px}.invite-box{margin-top:17px;padding:13px;background:#f0f5ff;border-radius:11px;display:grid;gap:4px}.invite-box small,.invite-box span{font-size:10px;color:#718097}.invite-box strong{font:800 19px Manrope;letter-spacing:1.7px;color:#405de0}.panel-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.count-pill{padding:6px 10px;border-radius:9px;background:#f0f4fa;color:#61718a;font-size:11px;font-weight:800}.inline-form{display:flex;align-items:end;gap:9px;flex-wrap:wrap}.inline-form>input,.inline-form>select{flex:1;min-width:170px}.student-list,.assigned-list{margin-top:14px}.student-line,.assigned-row{display:flex;align-items:center;gap:10px;padding:10px 2px;border-top:1px solid #eff2f6}.student-line strong{font-size:13px}.avatar{width:30px;height:30px;display:grid;place-items:center;border-radius:9px;background:#e9edff;color:#4967e8;font-weight:800}.muted{font-size:12px;color:#8995a6}.student-line .muted{margin-left:auto}.assigned-row{justify-content:space-between;text-decoration:none;color:#33445d;font-weight:700;font-size:13px}.task-form{margin-top:8px}.task-form textarea{resize:vertical}.two-fields{display:grid;grid-template-columns:1fr 1fr;gap:12px}.code-input{font:12px/1.5 ui-monospace,monospace!important;background:#1e293b!important;color:#e2e8f0!important}.student-dashboard{padding-bottom:30px}.student-task-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.score{display:block;margin:0 0 14px;color:#12805d}.page-title{max-width:1160px;margin:36px auto 20px}.page-title .back-link{margin-bottom:20px}.back-link{display:inline-flex;padding:8px 12px;border-radius:9px;background:#eef2ff;color:#435ddd;text-decoration:none;font-size:12px;font-weight:800}.demo-alert{padding:12px 15px;margin-top:18px;background:#fff9e9;border:1px solid #f5e1a9;border-radius:11px;color:#8c6a17;font-size:12px}.demo-workspace{max-width:1160px;margin:0 auto 24px;display:grid;grid-template-columns:1fr 1fr;min-height:500px;border:1px solid #dce3ee;border-radius:18px;overflow:hidden;box-shadow:var(--shadow);background:#fff}.code-panel{background:#20283a;display:flex;flex-direction:column;min-width:0}.code-tabs{height:49px;background:#182033;display:flex;align-items:center;gap:6px;padding:0 13px}.code-tabs button{border:0;background:transparent;color:#aab6cb;padding:8px 13px;border-radius:8px;font-weight:800;cursor:pointer}.code-tabs button.active{background:#34415c;color:#fff}.code-panel textarea{flex:1;width:100%;height:390px;resize:none;border:0;outline:0;padding:17px 20px;background:#20283a;color:#e6edf9;font:13px/1.65 ui-monospace,SFMono-Regular,Consolas,monospace;tab-size:2}.demo-actions{padding:9px 13px;display:flex;align-items:center;justify-content:space-between;border-top:1px solid #34415c}.demo-actions span{color:#aab6cb;font-size:10px}.preview-panel{display:flex;flex-direction:column;min-width:0;background:#fff}.preview-label{height:49px;padding:14px 17px;border-bottom:1px solid #e5eaf1;font-size:12px;font-weight:800;color:#52627a}.preview-panel iframe{border:0;width:100%;flex:1;min-height:450px;background:white}.submit-row{max-width:1160px;margin:0 auto 35px;display:flex;align-items:center;justify-content:space-between;gap:12px;color:#7b8799;font-size:12px}.student-work-form{max-width:1160px;margin:auto}.submission-list{padding:8px 18px}.submission{border-bottom:1px solid #edf0f5;padding:14px 0}.submission summary{display:flex;gap:18px;align-items:center;cursor:pointer;font-size:12px}.submission summary span,.submission time{color:#78869a}.submission-code pre{max-height:240px;overflow:auto;padding:13px;background:#1e293b;color:#e2e8f0;border-radius:9px;white-space:pre-wrap;overflow-wrap:anywhere}.submission-code h3{font:750 13px Manrope}footer{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:15px;padding:16px 5vw;border-top:1px solid #e3e9f1;background:#fff;color:#8591a2;font-size:11px}footer .brand{font-size:16px}footer .brand-mark{width:29px;height:29px;font-size:15px;border-radius:9px}
@media(max-width:900px){.task-grid,.student-task-grid{grid-template-columns:repeat(2,1fr)}.dashboard-grid{grid-template-columns:220px 1fr}.hero:after{right:1%;opacity:.5}.server-stat-grid{grid-template-columns:repeat(4,1fr)}}@media(max-width:680px){.topbar{height:auto;min-height:68px;padding:12px 17px;align-items:flex-start;gap:10px}.brand{font-size:17px}.topbar nav{justify-content:flex-end;flex-wrap:wrap;gap:4px}.topbar nav a{min-height:34px;padding:0 9px;font-size:11px}.hero{padding:64px 0 48px}.hero h1{letter-spacing:-2px}.hero>p{font-size:15px}.hero:after{width:130px;height:120px;top:60px;right:0;font-size:35px}.task-grid,.student-task-grid{grid-template-columns:1fr}.teacher-callout{padding:25px;align-items:flex-start;flex-direction:column}.dashboard-grid{grid-template-columns:1fr}.dashboard{padding-top:25px}.two-fields{grid-template-columns:1fr}.demo-workspace{grid-template-columns:1fr}.demo-workspace .code-panel textarea{height:300px;min-height:250px}.preview-panel iframe{min-height:350px}.submit-row{align-items:flex-start;flex-direction:column}.auth-card{padding:25px}.student-line{flex-wrap:wrap}.student-line .muted{width:100%;margin:0 0 0 40px}.submission summary{align-items:flex-start;flex-direction:column;gap:3px}footer{flex-wrap:wrap}}