*{
    box-sizing:border-box;
    font-family:Inter,Arial,sans-serif;
}

body{
    margin:0;
    min-height:100vh;
    display:flex;
    justify-content:center;
    align-items:center;
    background:#111827;
}

.container{
    width:600px;
    height: auto;
    background:#f9fafb;
    padding: 30px;
    margin: 30px 0px;
    border-radius:25px;
    text-align:center;
}

h1{
    margin-bottom:5px;
}

.subtitle{
    color:#666;
}

.study-info input{
    width:100%;
    padding:10px;
    border-radius:10px;
    border:1px solid #ddd;
    margin-top:10px;font-size:16px;
}

.timer-box{
    margin:20px 0;
    padding:25px;
    border-radius:20px;
    background:#ffffff;
}

.timer{
    font-size:70px;
    font-weight:900;
}

#cycle{
    font-size:14px;
    color:#777;
}

.config{
    display:flex;
    justify-content:space-around;
    margin-bottom:30px;
}

.config input{
    width:60px;
}

button{
    border:0;
    padding:12px 15px;
    border-radius:12px;
    cursor:pointer;
    margin:4px;
}

.buttons button{
    background:#111827;
    color:white;
}

.ambiente-buttons{
    display:flex;
    justify-content:center;
}

.videos{
    display:flex;
    gap:15px;
    overflow-x:auto;
}

.video-card{
    min-width:220px;
}

iframe{
    width:220px;
    height:130px;
    border-radius:15px;
}

@media(max-width:500px){
    .container{
        width:95%;
    }
}

#exitFocus{
    display:none;
}

.focus-mode{
    position:fixed;
    inset:0;
    width:100%;
    height:100%;
    border-radius:0;
    display:flex;
    flex-direction:column;
    justify-content:center;
    background:#111827;
    color:white;
    z-index:10;
}

.focus-mode .config, .focus-mode .study-info, .focus-mode .ambiente, .focus-mode .subtitle, .focus-mode #focusModeBtn{
    display:none;
}

.focus-mode .timer-box{
    background:transparent;
}

.focus-mode .timer{
    font-size:120px;
}

.focus-mode #exitFocus{
    display:block;
    position:absolute;
    top:25px;
    right:25px;
    background:white;
    color:#111827;
}

.focus-mode h1{
    font-size:40px;
}

.volume-control{
    margin-top:20px;
    display:flex;
    flex-direction:column;
    gap:10px;
}

.volume-control input{
    width:100%;
}