:root{--bg:#fff;--surface:#fff;--ink:#101828;--muted:#667085;--line:#e4eaf2;--blue:#1677ff;--blue-soft:#e8f2ff;--purple-soft:#f0ebff;--yellow-soft:#fff2c9;--green-soft:#e2f8ec;--pink-soft:#ffe8ef;--shadow:0 10px 28px rgba(16,24,40,.045)}*{box-sizing:border-box}body{margin:0;font-family:'Plus Jakarta Sans',system-ui,sans-serif;color:var(--ink);background:var(--bg)}button,input,textarea{font:inherit}.plain{border:0;background:none}.topbar{height:74px;border-bottom:1px solid #edf0f4;display:flex;align-items:center;justify-content:space-between;padding:0 max(32px,calc((100vw - 1460px)/2));position:sticky;top:0;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);z-index:5}.brand{display:flex;align-items:center;gap:12px;font-size:20px;font-weight:800;color:var(--ink);cursor:pointer}.logo{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;color:#fff;background:linear-gradient(145deg,#1882ff,#2465ee);font-size:21px}.top-actions{display:flex;align-items:center;gap:14px}.icon-btn,.avatar,.menu-btn{border:0;background:transparent;display:grid;place-items:center;cursor:pointer}.icon-btn{width:42px;height:42px;border-radius:12px}.icon-btn:hover{background:#f5f7fa}.icon-btn svg{width:22px}.avatar{width:42px;height:42px;border-radius:50%;background:var(--blue-soft);color:#1767d9;font-weight:800}.main{max-width:1460px;margin:auto;padding:34px 32px 44px}.welcome{height:132px;border-radius:18px;background:linear-gradient(100deg,#f5f8fd 0%,#f6f9fd 64%,#e7f1ff 100%);display:flex;align-items:center;gap:26px;padding:30px 44px;position:relative;overflow:hidden}.welcome-icon{width:74px;height:74px;display:grid;place-items:center;position:relative;z-index:1}.welcome-icon svg{width:56px;height:56px;stroke:#162033}.welcome h1{font-size:32px;margin:0 0 7px;letter-spacing:-.04em}.welcome p{font-size:17px;color:var(--muted);margin:0}.arc{position:absolute;width:280px;height:280px;border:44px solid rgba(91,150,255,.18);border-radius:50%;right:-45px;top:-160px}.section{margin-top:34px}.section-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.section-head h2{font-size:24px;margin:0;letter-spacing:-.03em}.section-head p{margin:6px 0 0;color:var(--muted);font-size:14px}.text-btn{border:0;background:none;color:var(--blue);font-weight:600;display:flex;gap:8px;align-items:center;cursor:pointer}.text-btn svg{width:18px}.tools{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}.tool{min-height:270px;text-align:left;border:1px solid var(--line);background:#fff;border-radius:16px;padding:24px;display:flex;flex-direction:column;align-items:flex-start;cursor:pointer;transition:.18s ease;box-shadow:0 1px 2px rgba(16,24,40,.01)}.tool:hover{transform:translateY(-3px);border-color:#ccd8e7;box-shadow:var(--shadow)}.tool-icon{width:66px;height:66px;border-radius:15px;display:grid;place-items:center;margin-bottom:20px}.tool-icon svg{width:32px;height:32px}.tool-icon.blue{background:var(--blue-soft);color:#1473ee}.tool-icon.purple{background:var(--purple-soft);color:#5a3bc5}.tool-icon.yellow{background:var(--yellow-soft);color:#a46d00}.tool-icon.green{background:var(--green-soft);color:#087a42}.tool-icon.pink{background:var(--pink-soft);color:#b02d63}.tool strong{font-size:20px;margin-bottom:8px}.tool small{font-size:14px;line-height:1.55;color:var(--muted);max-width:190px}.round-arrow{width:42px;height:42px;border-radius:50%;background:#f4f6f8;display:grid;place-items:center;margin-top:auto;color:#172033}.round-arrow svg{width:20px}.classes-section{margin-top:38px}.btn{height:44px;padding:0 16px;border-radius:11px;border:1px solid var(--line);background:#fff;color:var(--ink);font-weight:600;display:inline-flex;align-items:center;justify-content:center;gap:8px;cursor:pointer}.btn svg{width:18px}.btn.primary{background:var(--blue);border-color:var(--blue);color:#fff}.btn.subtle{background:#fff}.btn.danger{color:#c93636;background:#fff5f5;border-color:#ffdede}.classes{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.class-card{min-height:88px;border:1px solid var(--line);border-radius:15px;padding:16px 18px;background:#fff;display:flex;align-items:center;gap:14px;text-align:left}.class-icon{width:50px;height:50px;border-radius:12px;background:var(--blue-soft);color:#1473ee;display:grid;place-items:center}.class-icon svg{width:25px}.class-info{display:flex;flex-direction:column;gap:5px;flex:1}.class-info b,.new-card b{font-size:16px}.class-info small,.new-card small{color:var(--muted);font-size:13px}.menu-btn{width:40px;height:40px;border-radius:10px}.menu-btn:hover{background:#f5f7fa}.new-card{border-style:dashed;cursor:pointer;justify-content:center;color:var(--ink)}.new-card>span:last-child{display:flex;flex-direction:column;gap:4px}.plus-circle{width:42px;height:42px;border-radius:50%;border:2px solid #cbd5e1;display:grid;place-items:center;color:#667085}.tip{margin-top:20px;min-height:76px;border:1px solid var(--line);border-radius:15px;background:#f9fbfe;display:flex;align-items:center;padding:14px 18px;gap:14px}.tip-icon{width:42px;height:42px;border-radius:12px;background:#fff5c9;color:#b17a00;display:grid;place-items:center}.tip-icon svg{width:22px}.tip>div{display:flex;flex-direction:column;gap:3px;flex:1}.tip>div span{font-size:13px;color:var(--muted)}.modal-bg{position:fixed;inset:0;background:rgba(16,24,40,.35);backdrop-filter:blur(4px);z-index:20;display:grid;place-items:center;padding:20px}.modal{width:min(620px,100%);background:#fff;border-radius:20px;padding:26px;box-shadow:0 24px 70px rgba(16,24,40,.18)}.modal-title{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:22px}.modal h3{font-size:24px;margin:0 0 6px}.modal p{margin:0;color:var(--muted);font-size:14px}.modal label{font-size:13px;font-weight:700;display:block;margin:16px 0 8px}.modal label span{font-weight:500;color:var(--muted)}.input,textarea{width:100%;border:1px solid #d9e1ea;border-radius:11px;padding:12px 14px;outline:none}.input:focus,textarea:focus{border-color:#78adff;box-shadow:0 0 0 3px #eaf3ff}textarea{height:210px;resize:vertical}.modal-actions{display:flex;justify-content:space-between;align-items:center;margin-top:20px}.modal-actions>div{display:flex;gap:10px}.toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);background:#101828;color:#fff;border-radius:12px;padding:13px 18px;display:flex;gap:9px;align-items:center;box-shadow:0 14px 40px rgba(16,24,40,.2);z-index:30;font-size:14px}.toast svg{width:18px}.tool-page{min-height:calc(100vh - 74px)}.back{margin-bottom:30px}.placeholder{min-height:520px;border:1px solid var(--line);border-radius:18px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}.tool-icon.large{width:82px;height:82px}.placeholder h1{font-size:34px;margin:2px 0 10px}.placeholder p{color:var(--muted);margin:0}.coming{margin-top:22px;background:#f7f9fc;border-radius:10px;padding:12px 16px;font-size:13px;color:var(--muted)}@media(max-width:1000px){.tools{grid-template-columns:repeat(2,1fr)}.classes{grid-template-columns:1fr 1fr}.tool{min-height:230px}}@media(max-width:640px){.topbar{padding:0 18px}.main{padding:22px 18px}.welcome{height:auto;padding:24px}.welcome-icon{display:none}.welcome h1{font-size:26px}.welcome p{font-size:14px}.tools,.classes{grid-template-columns:1fr}.tool{min-height:200px}.section-head.classes-head{align-items:flex-end}.tip .btn{display:none}.brand{font-size:18px}.logo{width:38px;height:38px}.tool small{max-width:none}}