:root{
    --bg:#0f172a;
    --surface:#111827;
    --card:#1e293b;
    --card2:#162033;
    --border:#334155;
    --text:#ffffff;
    --muted:#cbd5e1;
    --accent:#2563eb;
    --accent2:#1d4ed8;
    --warning:#fbbf24;
    --danger:#f87171;
    --ok:#34d399;
}
*{box-sizing:border-box}
body{
    margin:0;
    font-family:Arial, Helvetica, sans-serif;
    background:var(--bg);
    color:var(--text);
    line-height:1.5;
}
header{
    background:#111827;
    border-bottom:1px solid #1e293b;
    padding:34px 20px;
    text-align:center;
}
header h1{margin:0 0 8px;font-size:clamp(1.8rem,4vw,2.55rem)}
header p{margin:0;color:var(--muted)}
nav{
    display:flex;
    justify-content:center;
    flex-wrap:wrap;
    gap:10px;
    margin-top:18px;
}
nav a{
    color:#ffffff;
    text-decoration:none;
    border:1px solid var(--border);
    border-radius:999px;
    padding:8px 12px;
    background:rgba(255,255,255,.045);
}
.container{
    max-width:980px;
    margin:0 auto;
    padding:32px 18px 48px;
}
.card{
    background:var(--card);
    border:1px solid var(--border);
    border-radius:16px;
    padding:22px;
    box-shadow:0 18px 42px rgba(0,0,0,.2);
}
.grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(230px,1fr));
    gap:16px;
}
label{
    display:block;
    color:var(--muted);
    font-weight:bold;
    margin-top:12px;
}
input,select{
    width:100%;
    padding:12px;
    margin-top:6px;
    border-radius:10px;
    border:1px solid var(--border);
    background:#0b1220;
    color:#ffffff;
    font-size:1rem;
}
button{
    width:100%;
    margin-top:18px;
    padding:13px 16px;
    border:0;
    border-radius:10px;
    background:var(--accent);
    color:#ffffff;
    font-weight:bold;
    font-size:1rem;
    cursor:pointer;
}
button:hover{background:var(--accent2)}
.result{
    margin-top:20px;
    padding:16px;
    border-radius:12px;
    border:1px solid var(--border);
    background:#0b1220;
    color:#ffffff;
}
.result strong{color:#ffffff}
.note,.disclaimer,.assumptions{
    margin-top:20px;
    padding:14px;
    border-radius:12px;
    font-size:.95rem;
}
.note{
    background:rgba(37,99,235,.10);
    border:1px solid rgba(37,99,235,.35);
    color:#dbeafe;
}
.assumptions{
    background:rgba(251,191,36,.08);
    border:1px solid rgba(251,191,36,.35);
    color:#fde68a;
}
.disclaimer{
    background:rgba(248,113,113,.08);
    border:1px solid rgba(248,113,113,.35);
    color:#fecaca;
}
.related{
    margin-top:24px;
    padding:16px;
    border:1px solid var(--border);
    border-radius:12px;
    background:var(--card2);
}
.related a{color:#93c5fd;text-decoration:none}
.footer{
    text-align:center;
    color:var(--muted);
    padding:34px 20px;
    border-top:1px solid var(--border);
}
.tool-list{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
    gap:16px;
}
.tool-list a{
    display:block;
    padding:18px;
    border-radius:14px;
    border:1px solid var(--border);
    background:var(--card);
    color:#ffffff;
    text-decoration:none;
}
.tool-list span{display:block;color:var(--muted);font-size:.92rem;margin-top:6px}
.small{font-size:.9rem;color:var(--muted)}
.pass{color:var(--ok)}
.warn{color:var(--warning)}
.fail{color:var(--danger)}
table{width:100%;border-collapse:collapse;margin-top:16px}
th,td{border:1px solid var(--border);padding:10px;text-align:left}
th{background:#0b1220}
@media(max-width:600px){
    .container{padding:24px 14px 40px}
    .card{padding:18px}
}