*{
    box-sizing: border-box;
}
:root {
    --green-dark: #123c35;
    --green: #1f7667;
    --green-light: #70f8cf;
    --background: #f3f7f5;
    --white: #ffffff;
    --text: #1f2937;
    --muted:#64748b;
    --border:#d8e2de;
    --danger: #dc2626;
} 
body{
    margin:0;
    min-height: 100vh;
    background: var(--background);
    color: var(--text);
    font-family: Arial, sans-serif;
    line-height:1.5;
}
header{
    padding: 42px 24px;
    color: white;
    background: linear-gradient(135deg, var(--green-dark), var(--green));
}
header h1{
    margin:0;
    font-size: 36px;
}
header p{
    margin:8px 0 0;
    color:var(--green-light)
}
nav{
    position:sticky;
    top:0;
    z-index:10;
    display:flex;
    flex-wrap:wrap;
    gap:10px;
    padding: 14px 24px;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 3px 12px rgb(15 23 42/8%);
}
button{
    padding: 10px 16px;
    border:none;
    border-radius:9px;
    background:var(--green);
    color:white;
    font-weight:bold;
    cursor:pointer;
}
button:hover{
    filter:brightness(0.92);
}
nav button{
    background:#43430a;
    color:white;
}
main{
    width:min(1100px,100%);
    margin: 0 auto;
    padding: 30px 24px;
}

.page{
    display: none;
}
.page.active{
    display:block;
}
.page > h2{
    margin-top: 0;
    font-size:28px;
}
.dashboard-summary{
    display:grid;
    grid-template-columns:repeat(3,minmax(0, 1fr));
    gap: 16px;
    margin-top: 24px;
}
.dashboard-summary p{
    margin:0;
    padding:24px;
    background:var(--white);
    border: 1px solid var(--bored);
    border-radius:14px;
    box-shadow: 0 8px 24px rgb(15 23 42/7%);
}
.dashboard-summary strong{
    display: block;
    margin-top: 8px;
    color:var(--green);
    font-size: 30px;
}
form{
    display:grid;
    grid-template-columns: 150px minmax(0,1fr);
    gap:12px 16px;
    align-items:center;
    max-width:760px;
    margin:24px 0;
    padding:22px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius:14px;
    box-shadow: 0 8px 24px rgb(15 23 42 / 7%);
}
form label{
    font-weight:bold;
}
input,
select{
    width:100%;
    padding:11px 12px;
    border: 1px solid #b9c3c3;
    border-radius: 8px;
    background: white;
    color: var(--text);
    font:inherit;
}
input:focus,
select:focus{
    outline: 3px solid rgb(31 118 103/18%);
    border-color:var(--green);
}
input[readonly]{
    background:#edf2f0;
}
form button{
    grid-column:2;
    justify-self:start;
}
ul{
    max-width:760px;
    margin:16px 0;
    padding:0;
    list-style:none;
}
li{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap: 16px;
    margin-bottom:10px;
    padding:10px 16px;
    background:var(--white);
    border: 1px solid var(--border);
    border-radius:10px;
}
li button{
    flex-shrink:0;
    padding:7px 11px;
    background:var(danger);
}
@media(max-width:650px){
    header{
        padding:30px 18px;
    }
    header h1{
        padding:30px;
    }
    nav{
        padding:12px 18px;
    }
    main{
        padding:22px 16px;
    }
    .dashboard-summary{
        grid-template-columns: 1fr;
    }
    form{
        grid-template-columns:1fr;
        padding:18px;
    }
    form button{
        grid-column:1;
        width:100%;
    }
}
nav button.active{
    background-color:#1F7667;
    color:#ffffff;
    box-shadow:0 4px 12px 12px rgb(31 118 103/35%);
    transform: translateY(-1px);
}
nav button:not(.active){
    background-color:#dce9e5;
    color:#123c35;
}