*{box-sizing:border-box}body{margin:0;font-family:Inter,Arial,sans-serif;background:#f6f7fb;color:#171923}button,input{font:inherit}button{cursor:pointer}.hidden{display:none}
.login{min-height:100vh;display:grid;place-items:center;background:linear-gradient(135deg,#111827,#4f46e5)}.login-card{width:min(420px,92%);background:#fff;padding:34px;border-radius:20px;box-shadow:0 25px 60px #0004}.brand{font-size:26px;font-weight:800}.brand span{color:#635bff}.muted{color:#6b7280}.field{margin:18px 0}.field label{display:block;font-weight:600;margin-bottom:7px}.field input{width:100%;padding:13px;border:1px solid #ddd;border-radius:10px}.primary{border:0;background:#635bff;color:#fff;padding:13px 18px;border-radius:10px;font-weight:700;width:100%}.demo{margin-top:14px;font-size:13px;text-align:center}
.layout{display:flex;min-height:100vh}.sidebar{width:245px;background:#111827;color:#fff;padding:24px;position:fixed;inset:0 auto 0 0}.side-brand{font-size:23px;font-weight:800;margin-bottom:38px}.side-brand span{color:#8b87ff}.nav button{display:block;width:100%;text-align:left;background:none;border:0;color:#cbd5e1;padding:13px 12px;border-radius:9px;margin:5px 0}.nav button.active,.nav button:hover{background:#252d3d;color:#fff}.main{margin-left:245px;width:calc(100% - 245px);padding:30px}.top{display:flex;justify-content:space-between;align-items:center;margin-bottom:28px}.avatar{width:42px;height:42px;border-radius:50%;background:#635bff;color:#fff;display:grid;place-items:center;font-weight:800}.welcome{background:linear-gradient(110deg,#635bff,#8b5cf6);color:#fff;border-radius:18px;padding:28px;margin-bottom:24px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.card{background:#fff;border-radius:16px;padding:20px;box-shadow:0 5px 20px #1111}.course{display:flex;flex-direction:column;gap:12px}.course-icon{height:120px;border-radius:12px;background:#eef2ff;display:grid;place-items:center;font-size:42px}.progress{height:8px;background:#e5e7eb;border-radius:99px;overflow:hidden}.progress i{display:block;height:100%;background:#635bff}.small{font-size:13px}.lesson{padding:16px 0;border-bottom:1px solid #eee;display:flex;justify-content:space-between;gap:12px}.badge{padding:5px 9px;border-radius:99px;background:#eef2ff;color:#4f46e5;font-size:12px;font-weight:700}.section{margin-bottom:30px}
@media(max-width:800px){.sidebar{width:190px}.main{margin-left:190px;width:calc(100% - 190px)}.grid{grid-template-columns:1fr 1fr}}@media(max-width:600px){.sidebar{position:static;width:100%;min-height:auto}.layout{display:block}.main{margin:0;width:100%;padding:18px}.grid{grid-template-columns:1fr}.nav{display:flex;overflow:auto}.nav button{min-width:max-content}.top h1{font-size:22px}}