:root{
    --primary:#1e3a8a;
    --background:#f4f6f9;
    --card:#ffffff;
    --border:#d1d5db;
}
body{
    margin:0;
    font-family:"Segoe UI", Arial, sans-serif;
    background:var(--background);
    color:#111827;
}
header{
    background:var(--primary);
    color:white;
    padding:20px;
    text-align:center;
}
header h1{margin:0;}
header p{margin-top:6px;font-size:14px;opacity:0.9;}

nav{
    display:flex;
    justify-content:center;
    gap:15px;
    padding:15px;
    background:#fff;
    border-bottom:1px solid var(--border);
}
nav button{
    padding:10px 18px;
    border:1px solid var(--primary);
    background:white;
    color:var(--primary);
    border-radius:6px;
    cursor:pointer;
    font-weight:600;
}
nav button:hover{
    background:var(--primary);
    color:white;
}

section{
    max-width:1000px;
    margin:auto;
    padding:20px;
    display:none;
}
.active{display:block;}

.section-heading{
    margin:25px 0 15px;
    padding:10px 14px;
    background:#e0e7ff;
    border-left:6px solid var(--primary);
    font-size:20px;
    font-weight:700;
    color:#1e3a8a;
    border-radius:6px;
}

.card{
    background:var(--card);
    border:1px solid var(--border);
    border-radius:8px;
    padding:16px;
    margin-bottom:14px;
}
.question{
    font-weight:600;
}
.answer{
    margin-top:10px;
    padding:12px;
    background:#f9fafb;
    border-left:4px solid var(--primary);
    display:none;
}
.action-btn{
    margin-top:12px;
    padding:8px 14px;
    background:var(--primary);
    color:white;
    border:none;
    border-radius:5px;
    cursor:pointer;
    font-size:14px;
}