*{
margin:0;
padding:0;
box-sizing:border-box;
font-family:Arial, Helvetica, sans-serif;
}

body{
background:#eef2f7;
min-height:100vh;
}

.security-wrapper{
min-height:100vh;
display:flex;
align-items:center;
justify-content:center;
padding:32px 20px;
}

.security-card{
width:min(900px, 100%);
background:#ffffff;
border-radius:22px;
box-shadow:0 18px 40px rgba(15, 23, 42, 0.12);
padding:32px 36px;
display:flex;
flex-direction:column;
gap:20px;
}

.security-header h2{
font-size:28px;
color:#1f2937;
margin-bottom:6px;
}

.security-header p{
color:#6b7280;
font-size:14px;
}

.section{
background:linear-gradient(180deg, #fbfdff, #f6faff);
border:1px solid #dbe5f4;
border-radius:20px;
padding:22px;
display:flex;
flex-direction:column;
gap:14px;
box-shadow:0 14px 30px rgba(15,23,42,0.08);
}

.section h3{
color:#163565;
font-size:18px;
letter-spacing:-0.01em;
}

.input-group{
display:flex;
flex-direction:column;
gap:8px;
}

.input-group input,
.input-group textarea{
width:100%;
padding:12px 14px;
border-radius:16px;
border:1px solid #d6e2f2;
font-size:15px;
box-shadow:0 10px 22px rgba(15,23,42,0.06);
transition:0.16s ease;
}

.input-group input:focus,
.input-group textarea:focus{
outline:none;
border-color:#4da3ff;
box-shadow:0 0 0 4px rgba(77,163,255,0.18), 0 14px 28px rgba(77,163,255,0.10);
}

.actions{
display:flex;
flex-wrap:wrap;
gap:12px;
}

.btn-primary{
display:inline-flex;
align-items:center;
justify-content:center;
gap:8px;
min-height:44px;
padding:10px 18px;
border-radius:14px;
background:linear-gradient(135deg, #1e293b 0%, #0f172a 40%, #2f89e0 100%);
color:white;
border:1px solid transparent;
cursor:pointer;
font-weight:700;
box-shadow:0 14px 28px rgba(15, 23, 42, 0.22);
transition:transform 0.16s ease, box-shadow 0.16s ease, background 0.16s ease;
}

.btn-primary:hover{
transform:translateY(-1px);
}

.btn-secondary{
display:inline-flex;
align-items:center;
justify-content:center;
gap:8px;
min-height:44px;
padding:10px 18px;
background:#ffffff;
color:#1e3a5f;
border:1px solid #d4e1f2;
border-radius:14px;
text-decoration:none;
cursor:pointer;
font-weight:700;
box-shadow:0 10px 20px rgba(47,137,224,0.10);
transition:transform 0.16s ease, box-shadow 0.16s ease, background 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.btn-secondary:hover{
transform:translateY(-1px);
background:#f5f9ff;
border-color:#b9cde8;
}

.btn-danger{
display:inline-flex;
align-items:center;
justify-content:center;
gap:8px;
min-height:44px;
padding:10px 18px;
background:linear-gradient(135deg, #dc4c64, #f87171);
color:white;
border:1px solid transparent;
border-radius:14px;
text-decoration:none;
cursor:pointer;
font-weight:700;
box-shadow:0 12px 24px rgba(220, 76, 100, 0.24);
transition:transform 0.16s ease, box-shadow 0.16s ease;
}

.btn-danger:hover{
transform:translateY(-1px);
}

.error-text{
color:#c0392b;
font-size:14px;
}

.notice{
background:#eaf2ff;
border:1px solid #cfe3ff;
color:#1f3b64;
padding:12px 14px;
border-radius:10px;
font-size:14px;
}

.qr-box{
background:#ffffff;
border:1px dashed #cbd5e1;
padding:16px;
border-radius:12px;
display:inline-flex;
}

.qr-box svg{
width:200px;
height:200px;
}

.code-list{
display:grid;
grid-template-columns:repeat(auto-fit, minmax(180px, 1fr));
gap:10px;
}

.code-item{
background:#ffffff;
border:1px solid #e2e8f0;
border-radius:10px;
padding:10px 12px;
font-family:"Courier New", Courier, monospace;
letter-spacing:1px;
text-align:center;
}

.tab-buttons{
display:flex;
gap:10px;
flex-wrap:wrap;
padding:10px;
border-radius:20px;
background:linear-gradient(180deg, #f8fbff, #eef5ff);
border:1px solid #d7e4fa;
}

.tab-buttons button{
background:#ffffff;
border:1px solid #d8e3f7;
padding:10px 14px;
border-radius:14px;
font-weight:700;
cursor:pointer;
transition:0.16s ease;
box-shadow:0 10px 20px rgba(47,137,224,0.08);
}

.tab-buttons button.active{
background:linear-gradient(135deg, #1e293b 0%, #0f172a 40%, #2f89e0 100%);
color:white;
border-color:transparent;
}

.hidden{
display:none;
}

@media (max-width: 600px){
  .security-card{padding:24px;}
  .actions{flex-direction:column;}
  .btn-primary,.btn-secondary,.btn-danger{width:100%;}
}