*{box-sizing:border-box}html,body{margin:0}body{color:#172b4d;background:#f6f8fc;font-family:Inter,Arial,PingFang SC,Microsoft YaHei,sans-serif}a{color:inherit;text-decoration:none}.shell{min-height:100vh;display:flex}.side{background:#fff;border-right:1px solid #e7ebf2;flex-direction:column;width:232px;padding:24px 16px;display:flex;position:fixed;inset:0 auto 0 0}.logoRow{align-items:center;gap:12px;padding:4px 8px 24px;display:flex}.logoMark{color:#fff;background:linear-gradient(135deg,#377df5,#5b9aff);border-radius:14px;place-items:center;width:42px;height:42px;font-size:20px;font-weight:900;display:grid;box-shadow:0 8px 20px #377df52c}.brand{color:#286ee9;letter-spacing:.5px;font-size:25px;font-weight:900}.sub{color:#8492a6;margin-top:2px;font-size:11px}.nav{flex-direction:column;gap:5px;display:flex}.nav a{color:#455a78;border-radius:12px;align-items:center;gap:11px;padding:11px 13px;font-size:14px;font-weight:650;display:flex}.nav a:hover,.nav a.active{color:#2876f0;background:#eaf2ff}.sideFoot{color:#6f7f95;background:#f5f8fd;border-radius:14px;flex-direction:column;gap:4px;margin-top:auto;padding:14px;font-size:11px;display:flex}.main{flex:1;max-width:1600px;margin-left:232px;padding:24px 34px 44px}.top{justify-content:space-between;align-items:center;padding-bottom:22px;display:flex}.topActions{align-items:center;gap:10px;display:flex}.search{color:#9aa6b5;background:#fff;border:1px solid #e3e8f0;border-radius:12px;width:260px;padding:10px 14px;font-size:12px}.avatar{color:#2876f0;background:#dfeaff;border-radius:50%;place-items:center;width:36px;height:36px;font-weight:800;display:grid}.muted{color:#7d8ca3}.eyebrow{color:#377df5;letter-spacing:.4px;font-size:12px;font-weight:800}.pageTitle{margin:10px 0 6px;font-size:30px}.pageIntro{color:#7d8ca3;margin:0}.hero{background:linear-gradient(120deg,#e8f1ff,#f0f7ff);border:1px solid #dce9ff;border-radius:24px;min-height:225px;margin-top:24px;padding:30px;position:relative;overflow:hidden}.hero:after{content:"";background:linear-gradient(135deg,#cfe2ff88,#8fc4ff55);border-radius:50%;width:260px;height:260px;position:absolute;top:-75px;right:-45px}.hero>*{z-index:1;position:relative}.hero h2{margin:18px 0 8px;font-size:26px}.hero p{color:#60728d}.btn{color:#fff;background:#377df5;border-radius:12px;align-items:center;gap:7px;margin-top:12px;padding:11px 16px;font-size:14px;font-weight:750;display:inline-flex;box-shadow:0 7px 18px #377df52b}.btn.secondary{color:#377df5;box-shadow:none;background:#fff;border:1px solid #d7e5ff}.pill{color:#377df5;background:#e8f1ff;border-radius:999px;padding:6px 10px;font-size:11px;font-weight:800;display:inline-flex}.grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:18px;display:grid}.grid4{grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-top:18px;display:grid}.card{background:#fff;border:1px solid #e3e8f0;border-radius:18px;padding:20px;box-shadow:0 3px 12px #1f314b08}.card h3{margin:8px 0}.card p{line-height:1.7}.stat{justify-content:space-between;align-items:flex-start;display:flex}.statIcon{color:#377df5;background:#edf4ff;border-radius:13px;place-items:center;width:42px;height:42px;display:grid}.sectionHead{justify-content:space-between;align-items:end;margin-top:28px;display:flex}.sectionHead h2{margin:0;font-size:20px}.sectionHead a{color:#377df5;font-size:12px;font-weight:800}.progress{background:#edf1f6;border-radius:999px;height:7px;margin-top:14px;overflow:hidden}.progress span{background:#377df5;border-radius:999px;height:100%;display:block}.lesson{background:#fff;border:1px solid #e3e8f0;border-radius:14px;justify-content:space-between;align-items:center;margin:9px 0;padding:15px 18px;transition:all .15s;display:flex}.lesson:hover{border-color:#bdd3ff;transform:translateY(-1px);box-shadow:0 5px 16px #377df510}.lessonLeft{align-items:center;gap:14px;display:flex}.num{color:#377df5;background:#edf4ff;border-radius:11px;place-items:center;width:38px;height:38px;font-size:12px;font-weight:900;display:grid}.stageGrid{grid-template-columns:repeat(4,1fr);gap:12px;margin:22px 0;display:grid}.stage{background:#fff;border:1px solid #e3e8f0;border-radius:16px;padding:17px}.stage:nth-child(2){background:#edfbf8}.stage:nth-child(3){background:#fff7e9}.stage:nth-child(4){background:#f6f1ff}.stage b{margin-bottom:5px;display:block}.cols{grid-template-columns:2fr 1fr;gap:18px;margin-top:20px;display:grid}.tabs{flex-wrap:wrap;gap:8px;margin-top:20px;display:flex}.tabs span{background:#fff;border:1px solid #e3e8f0;border-radius:999px;padding:8px 13px;font-size:12px}.tabs span:first-child{color:#377df5;background:#e8f1ff;border-color:#d6e6ff;font-weight:800}.flow{flex-wrap:wrap;gap:8px;margin-top:14px;display:flex}.flow span{background:#f3f7fd;border-radius:11px;padding:10px 13px;font-size:12px}.resource{flex-direction:column;min-height:145px;display:flex}.resource .btn{width:max-content;margin-top:auto}.hardwareVisual{color:#377df5;background:linear-gradient(135deg,#edf4ff,#f8fbff);border-radius:14px;place-items:center;height:105px;margin-bottom:14px;font-size:38px;display:grid}.chat{max-width:760px}.bubble{border-radius:16px;margin:12px 0;padding:15px 17px;line-height:1.65}.bubble.user{background:#eaf2ff;margin-left:80px}.bubble.ai{background:#eafaf7;margin-right:45px}.input{background:#fafcff;border:1px solid #dfe6ee;border-radius:12px;width:100%;padding:14px}.notice{color:#765a20;background:#fff8e8;border:1px solid #f7e0ad;border-radius:13px;padding:13px 15px;font-size:12px}.adminTable{border-collapse:collapse;width:100%;margin-top:12px}.adminTable th,.adminTable td{text-align:left;border-bottom:1px solid #edf0f4;padding:12px;font-size:13px}.adminTable th{color:#7d8ca3;font-size:11px}.tagGreen{color:#229f69;background:#eaf8f1;border-radius:999px;padding:5px 8px;font-size:11px;font-weight:800}@media (max-width:1050px){.grid4,.stageGrid{grid-template-columns:repeat(2,1fr)}.search{display:none}}@media (max-width:800px){.side{display:none}.main{margin-left:0;padding:20px}.grid,.grid4,.cols,.stageGrid{grid-template-columns:1fr}.topActions b{display:none}.hero{min-height:auto}}.loginPage{background:linear-gradient(135deg,#f6f8fc,#e8f1ff);place-items:center;min-height:100vh;padding:24px;display:grid}.loginCard{width:100%;max-width:460px;padding:32px}.loginCard .logoRow{padding-left:0}.loginForm{flex-direction:column;gap:10px;margin-top:26px;display:flex}.loginForm label{margin-top:6px;font-size:13px;font-weight:700}.loginForm .btn{cursor:pointer;border:0;justify-content:center}.loginForm button:disabled,.logoutButton:disabled{opacity:.6;cursor:wait}.logoutButton{cursor:pointer;white-space:nowrap;margin-top:0;font-size:12px}.input:focus-visible{outline-offset:2px;outline:2px solid #377df5}.btn{cursor:pointer;border:0;transition:background .15s,transform .15s}.btn:hover{filter:brightness(.97);transform:translateY(-1px)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn:focus-visible,a:focus-visible,button:focus-visible{outline-offset:3px;outline:3px solid #a9c9ff}.card h2{font-size:20px;line-height:1.45}.pageIntro{line-height:1.7}.questionButton{text-align:left;color:#455a78;cursor:pointer;width:100%;font:inherit;background:#f8fbff;border:1px solid #e3e8f0;border-radius:12px;margin:10px 0;padding:12px;display:block}.questionButton:hover{background:#eaf2ff}.chatMessages{min-height:120px;max-height:450px;overflow:auto}.cols label{margin:14px 0;font-size:14px;font-weight:600;display:block}.lessonSupport{border-top:1px solid #e6edf5;padding-top:16px}.lessonSupport .btn{margin-right:12px}