:root{
  --bg:#f6f8fa;
  --card:#ffffff;
  --accent:#2563eb;
  --danger:#dc2626;
  --muted:#6b7280;
  --success:#16a34a;
}

*{box-sizing:border-box}
body{
  font-family:Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  margin:0;
  padding:32px;
  background:linear-gradient(180deg,#eef2ff, var(--bg));
  color:#111827;
  min-height:100vh;
}

.container{
  max-width:520px;
  margin:0 auto;
  background:var(--card);
  padding:28px;
  border-radius:12px;
  box-shadow:0 8px 30px rgba(16,24,40,0.08);
}

h1{
  margin:0 0 18px 0;
  font-size:20px;
}

.field{
  margin-bottom:14px;
  display:flex;
  flex-direction:column;
  gap:6px;
}

.field label{
  font-weight:600;
  font-size:14px;
}

.field input[type="text"],
.field input[type="email"],
.field input[type="tel"],
.field input[type="password"]{
  padding:10px 12px;
  border:1px solid #e6e9ee;
  border-radius:8px;
  font-size:14px;
  outline:none;
  transition:box-shadow .12s, border-color .12s;
}

.field input:focus{
  border-color:var(--accent);
  box-shadow:0 0 0 4px rgba(37,99,235,0.08);
}

.error{
  color:var(--danger);
  font-size:13px;
  min-height:18px;
}

input.valid{
  border-color: #10b981;
}

input.invalid{
  border-color: var(--danger);
}

.checkbox-field{
  flex-direction:row;
  align-items:center;
  gap:8px;
}

button{
  background:var(--accent);
  color:white;
  border:none;
  padding:10px 14px;
  font-size:15px;
  border-radius:10px;
  cursor:pointer;
  width:100%;
  margin-top:8px;
}

button:disabled{
  opacity:0.5;
  cursor:not-allowed;
}

meter{
  width:100%;
  height:8px;
  margin-top:6px;
  border-radius:6px;
  appearance:none;
}

#formMessage{
  margin-top:12px;
  font-weight:600;
}

#formMessage.success{
  color:var(--success);
}

#formMessage.error{
  color:var(--danger);
}

/* small responsive tweak */
@media (max-width:520px){
  body{padding:16px}
  .container{padding:18px}
}
.custom-link {
    margin-right: auto;
    display: inline-block;
    padding: 12px 28px;
    background: linear-gradient(45deg, #6a11cb, #2575fc);
    color: white;
    text-decoration: none;
    font-weight: 600;
    border-radius: 30px;
    box-shadow: 0 4px 15px rgba(38, 50, 56, 0.3);
    transition: background 0.3s ease, box-shadow 0.3s ease;
    font-family: Arial, sans-serif;
  }

  .custom-link:hover {
    background: linear-gradient(45deg, #2575fc, #6a11cb);
    box-shadow: 0 6px 20px rgba(38, 50, 56, 0.5);
    text-decoration: none;
  }