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

body{
  background:#f1f5f9;
  color:#0f172a;
}

.topbar{
  background:#0f172a;
  color:#fff;
  padding:18px 28px;
  display:flex;
  justify-content:space-between;
  align-items:center;
}

.topbar a{
  color:#fff;
  text-decoration:none;
  margin-left:10px;
  background:#1e293b;
  padding:10px 14px;
  border-radius:10px;
}

.container{
  max-width:1200px;
  margin:30px auto;
  padding:0 20px;
}

.card{
  background:#fff;
  border-radius:16px;
  padding:24px;
  box-shadow:0 8px 24px rgba(0,0,0,.08);
  margin-bottom:24px;
}

h1,h2,h3{
  margin-bottom:14px;
}

p{
  margin-bottom:8px;
  line-height:1.5;
}

.grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:24px;
}

.list-box{
  border:1px solid #e2e8f0;
  background:#f8fafc;
  padding:16px;
  border-radius:12px;
  margin-top:14px;
}

input, textarea, select{
  width:100%;
  padding:12px;
  border:1px solid #cbd5e1;
  border-radius:10px;
  margin-top:10px;
  margin-bottom:10px;
}

textarea{
  min-height:110px;
  resize:vertical;
}

button{
  background:#2563eb;
  color:#fff;
  border:none;
  padding:12px 16px;
  border-radius:10px;
  cursor:pointer;
}

button.danger{
  background:#dc2626;
}

button.secondary{
  background:#475569;
}

.nav-links{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
}

.badge{
  display:inline-block;
  padding:6px 10px;
  border-radius:999px;
  background:#dbeafe;
  color:#1d4ed8;
  font-size:13px;
  margin-top:8px;
}

.success{
  color:#15803d;
}

.error{
  color:#dc2626;
}

@media(max-width:900px){
  .grid{
    grid-template-columns:1fr;
  }
}