*{
margin:0;
padding:0;
box-sizing:border-box;
}

body{
font-family:Arial,sans-serif;
background:#f5f7fb;
color:#333;
}

.header{
background:linear-gradient(135deg,#2563eb,#1e40af);
color:white;
padding:25px;
text-align:center;
}

.header h1{
font-size:32px;
margin-bottom:5px;
}

.container{
max-width:1100px;
margin:auto;
padding:20px;
}

.card,
.lesson,
.quiz,
.module{
background:white;
padding:25px;
border-radius:15px;
box-shadow:0 5px 15px rgba(0,0,0,.08);
margin-bottom:20px;
}

.lesson h2,
.quiz h2{
color:#2563eb;
margin-bottom:15px;
}

.word{
font-size:24px;
font-weight:bold;
color:#2563eb;
margin-top:15px;
}

.translation{
color:#666;
margin-bottom:15px;
}

.btn,
button{
display:inline-block;
background:#2563eb;
color:white;
padding:12px 22px;
border:none;
border-radius:8px;
cursor:pointer;
text-decoration:none;
}

.btn:hover,
button:hover{
opacity:.9;
}

.footer{
text-align:center;
padding:25px;
color:#666;
}

.modules{
display:grid;
gap:15px;
}

.module{
display:flex;
justify-content:space-between;
align-items:center;
}

@media(max-width:768px){

.container{
padding:12px;
}

.module{
flex-direction:column;
gap:15px;
text-align:center;
}

.btn,
button{
width:100%;
}

}