:root{--bg:#f6f7f9;--paper:#fff;--ink:#202c36;--muted:#71808c;--line:#e6eaee;--green:#227c64;--mint:#eaf5ef;--orange:#a96528;--sand:#fff4e7;--red:#b74c4c;--shadow:0 12px 40px #1e353909;font-family:"Segoe UI",Arial,sans-serif;color:var(--ink);font-size:15px}*{box-sizing:border-box}body{margin:0;background:var(--bg)}button,input,textarea,select{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:var(--green)}button:disabled{opacity:.55;cursor:wait}input,textarea,select{border:1px solid #d9e0e5;border-radius:9px;background:#fff;color:var(--ink);padding:12px;width:100%;outline:none}input:focus,textarea:focus,select:focus{border-color:var(--green);box-shadow:0 0 0 3px #227c6414}textarea{min-height:110px;resize:vertical;font-family:Consolas,monospace}label{display:flex;flex-direction:column;gap:8px;font-size:13px;font-weight:600;margin:18px 0}label 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0;font-size:13px}.brand{font-size:38px;font-weight:750;letter-spacing:-2px;color:var(--ink);text-decoration:none;display:flex;align-items:center;width:max-content}.brand span{color:var(--green)}.brand i{font-style:normal;font-size:9px;color:#d8ac66;align-self:flex-start;margin:12px 0 0 4px}.auth-layout{min-height:100vh;display:grid;grid-template-columns:1fr 1fr}.auth-story{background:#eaf1ec;padding:48px 9%;display:flex;flex-direction:column;justify-content:space-between;gap:50px;position:relative;overflow:hidden}.auth-story:after{content:"+";position:absolute;font-size:340px;color:#dce8de;right:-90px;bottom:100px;font-weight:100;transform:rotate(12deg);pointer-events:none}.auth-story h1{font-size:clamp(34px,3.5vw,55px);margin:22px 0}.auth-story p{color:#677d70;line-height:1.8}.auth-story small{color:#718578;font-size:11px}.sample-note{position:relative;z-index:1;max-width:350px;background:#fffef9;padding:25px;border:1px solid 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.brand{margin:0 16px 45px}.workspace-label{font-size:9px;letter-spacing:1.7px;color:#9aa4ac;padding-left:16px;margin-bottom:15px}.nav-button{display:flex;gap:13px;align-items:center;text-align:left;width:100%;padding:13px 16px;border:0;border-radius:8px;background:transparent;margin:4px 0;color:#74818b;font-size:13px}.nav-button:hover{background:#f6f8f7}.nav-button.active{background:var(--mint);color:var(--green);font-weight:650}.nav-icon{font-size:17px;min-width:18px}.sidebar-bottom{margin-top:auto;padding-top:30px}.trust-dot{display:flex;gap:6px;align-items:center;color:var(--green);font-size:8px;margin:18px 6px}.trust-dot span{font-size:10px;color:var(--muted)}.user-pill{background:none;border:0;border-top:1px solid var(--line);width:100%;padding:20px 2px 0;display:flex;align-items:center;gap:10px;text-align:left}.user-pill>span:first-child{display:grid;place-items:center;width:35px;height:35px;border-radius:50%;background:#f0e9dc;color:#8c7550;font-size:12px}.user-pill b{display:block;max-width:100px;overflow:hidden;text-overflow:ellipsis;font-size:12px}.user-pill small{color:var(--muted);font-size:10px}.logout-icon{margin-left:auto;color:var(--muted)}.main-wrap{width:calc(100% - 230px);margin-left:230px}header{height:77px;border-bottom:1px solid var(--line);padding:0 40px;display:flex;align-items:center;justify-content:space-between;background:#ffffff9e;gap:15px}.breadcrumb{font-size:12px;color:var(--muted)}.breadcrumb span{margin:0 12px;color:#c8cdd1}.breadcrumb b{color:#41505c;font-weight:500}.header-right{display:flex;align-items:center;gap:20px}.header-right select{width:160px;padding:8px;font-size:12px}.local-badge{border:1px solid #e3e8e3;background:#f5f9f4;padding:7px 10px;border-radius:20px;color:#6c8469;font-size:10px;white-space:nowrap}main{padding:35px 40px;max-width:1500px;margin:auto;min-height:calc(100vh - 135px)}.page-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:30px;gap:20px}.page-top h1{margin:8px 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h3{font-size:17px}.empty p{font-size:13px;color:var(--muted);max-width:450px;margin:0 auto 20px;line-height:1.7}.filter-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:25px}.chip{background:white;border:1px solid var(--line);border-radius:25px;padding:9px 15px;font-size:11px;color:var(--muted)}.chip.active{background:var(--ink);border-color:var(--ink);color:white}.task-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:17px}.task-card{background:white;border:1px solid var(--line);border-radius:12px;padding:23px;display:flex;flex-direction:column;min-height:205px}.task-card .meta{display:flex;justify-content:space-between;margin-bottom:22px;color:var(--muted);font-size:10px}.task-card p{font-size:15px;line-height:1.7;flex:1;margin-bottom:25px}.task-card button{align-self:flex-start}.badge{display:inline-flex;border-radius:5px;padding:5px 8px;font-size:10px;background:var(--mint);color:var(--green);white-space:nowrap}.badge.orange{background:var(--sand);color:var(--orange)}.badge.gray{background:#f0f2f4;color:#73818b}.mistake-card{margin-bottom:20px}.card-title{display:flex;justify-content:space-between;align-items:flex-start;gap:20px}.card-title h3{font-size:18px;margin:12px 0}.explanation{background:#fbf8f1;border-left:3px solid #ddbb7c;padding:16px;font-size:13px;line-height:1.7;margin:18px 0;white-space:pre-line}.practice-list{display:flex;gap:12px;margin-top:20px}.practice-item{flex:1;border:1px solid var(--line);background:#fff;border-radius:8px;padding:14px;text-align:left;font-size:12px;line-height:1.6}.practice-item.solved{border-color:#b4d1be;background:#f5faf6}.practice-item small{display:block;color:var(--muted);margin-top:10px;font-size:10px}.toolbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:20px}.report-kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:30px 0}.report-kpis>div{border:1px solid var(--line);border-radius:10px;padding:20px}.report-kpis strong{display:block;font-size:29px;margin-bottom:6px}.report-kpis span{font-size:11px;color:var(--muted)}.setting-row{display:flex;justify-content:space-between;gap:20px;padding:18px 0;border-bottom:1px solid var(--line);font-size:13px}.setting-row span{color:var(--muted);text-align:right;font-size:12px}.code-box{background:#eff5f1;border:1px dashed #9fbea9;padding:18px;margin-top:15px;border-radius:8px;font:20px Consolas,monospace;user-select:all;overflow-wrap:anywhere}.link-row{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding:15px 0;gap:12px}.link-row b{font-size:13px}.link-row small{display:block;color:var(--muted);margin-top:5px}.notice{background:var(--sand);color:#8f6d42;padding:15px 18px;border-radius:8px;font-size:12px;line-height:1.7;margin-bottom:20px}dialog{width:min(640px,calc(100vw - 30px));border:1px solid var(--line);border-radius:16px;padding:28px;box-shadow:0 30px 100px #172c3440;max-height:90vh;overflow-y:auto}dialog::backdrop{background:#20322f70;backdrop-filter:blur(3px)}.dialog-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.icon-button{border:0;background:#f2f4f5;border-radius:50%;height:30px;width:30px;font-size:22px;color:#6c7e83}.task-statement{font-size:22px;line-height:1.6;letter-spacing:-.4px;margin-bottom:20px}.input-help{font-size:11px;color:var(--muted);line-height:1.7;margin-top:7px}.photo-preview{max-width:100%;max-height:160px;border-radius:8px;margin-top:10px}.result-box{background:var(--mint);border:1px solid #cde1d4;padding:20px;border-radius:10px;margin:20px 0;font-size:13px;line-height:1.8}.result-box.incorrect{background:var(--sand);border-color:#eddfc8}.result-box.needs_correction{background:#f1f3f5;border-color:#dce1e6}.result-box h3{margin:0 0 10px}.solution{font-family:Consolas,monospace;background:#f5f7f8;padding:18px;border-radius:8px;font-size:13px;line-height:1.8;margin-top:15px;white-space:pre-line}.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:var(--ink);color:white;box-shadow:0 5px 30px #0002;padding:14px 22px;border-radius:9px;max-width:90vw;font-size:13px;z-index:100}.toast.error{background:#a34848}footer{padding:18px 40px;border-top:1px solid var(--line);font-size:10px;color:#99a2a9;display:flex;justify-content:space-between;gap:20px}.list-line{border-bottom:1px solid var(--line);padding:18px 0}.list-line p{font-size:13px;line-height:1.7;margin:12px 0}.text-pre{white-space:pre-line;font-family:Consolas,monospace;font-size:12px;color:#697982;line-height:1.7}.danger-zone{border-color:#edcece}.loading{padding:100px;text-align:center;color:var(--muted)}.auth-card .btn{margin-top:4px}.auth-card .small{margin-top:15px}.student-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.student-card{padding:25px}.student-avatar{width:44px;height:44px;border-radius:12px;background:var(--mint);color:var(--green);display:grid;place-items:center;font-size:19px;margin-bottom:20px}.student-card h3{margin-bottom:8px}.student-card p{font-size:12px;color:var(--muted)}.review-note{margin-top:15px;padding:12px;background:#eff4fa;border-radius:8px;font-size:12px;line-height:1.6}button:focus-visible,a:focus-visible{outline:3px solid #9dcab7;outline-offset:3px}@media(min-width:1600px){main{padding-top:45px}.dashboard-grid{gap:28px}.panel{padding:30px}}@media(max-width:1150px){.sidebar{width:200px;padding:25px 15px}.main-wrap{margin-left:200px;width:calc(100% - 200px)}main{padding:28px 25px}header{padding:0 25px}.stats-grid{gap:10px}.stat{padding:17px}.task-grid,.student-grid{grid-template-columns:repeat(2,1fr)}.dashboard-grid{grid-template-columns:1fr}.two-col{grid-template-columns:1fr}.auth-story{padding:40px 8%}}@media(max-width:720px){.auth-layout{grid-template-columns:1fr}.auth-story{display:none}.auth-form{padding:35px 25px;min-height:100vh}.sidebar{position:sticky;top:0;width:100%;height:auto;padding:10px 12px;z-index:10;border-right:0;border-bottom:1px solid var(--line);display:block}.sidebar .brand{font-size:27px;margin:0 8px 8px}.sidebar .brand i{margin-top:7px}.workspace-label,.sidebar-bottom{display:none}.sidebar nav{display:flex;overflow:auto;gap:4px}.nav-button{width:auto;white-space:nowrap;padding:9px 12px;margin:0;gap:7px;font-size:11px}.nav-icon{font-size:13px;min-width:auto}.shell{display:block}.main-wrap{margin:0;width:100%}header{height:52px;padding:0 18px}.breadcrumb{font-size:10px}.breadcrumb span{margin:0 6px}.local-badge{display:none}.header-right select{width:120px}main{padding:25px 18px}h1{font-size:27px}.page-top{align-items:flex-start;gap:12px;flex-wrap:wrap;margin-bottom:22px}.stats-grid{grid-template-columns:repeat(2,1fr)}.stat{padding:18px}.stat-number{font-size:29px}.panel{padding:20px}.task-grid,.student-grid{grid-template-columns:1fr}.next-action{padding:20px;align-items:flex-start;flex-direction:column}.next-action h3{font-size:18px}.practice-list{flex-direction:column}.card-title{flex-wrap:wrap;gap:8px}.report-kpis{gap:8px}.report-kpis>div{padding:12px}.report-kpis strong{font-size:24px}.setting-row{flex-direction:column;gap:8px}.setting-row span{text-align:left}.attempt-row .date{display:none}footer{padding:18px;line-height:1.6}footer span{display:none}dialog{padding:22px}.task-statement{font-size:19px}.user-mobile-logout{display:inline-block}.stat-foot{font-size:9px}}
@media print{.sidebar,header,footer,.toolbar,.btn{display:none!important}.main-wrap{margin:0;width:100%}main{padding:0}.panel{box-shadow:none}body{background:white}}