* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f3f6fb;
  color: #111827;
}

.container {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 16px;
}

.card {
  background: #ffffff;
  padding: 24px;
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  margin-bottom: 24px;
}

h1 {
  margin-top: 0;
}

label {
  display: block;
  margin-top: 16px;
  font-weight: bold;
}

input,
select {
  width: 100%;
  padding: 12px;
  margin-top: 8px;
  border: 1px solid #d1d5db;
  border-radius: 10px;
  font-size: 16px;
}

.btn {
  display: inline-block;
  margin-top: 20px;
  padding: 12px 18px;
  background: #2563eb;
  color: white;
  border: none;
  border-radius: 10px;
  text-decoration: none;
  font-size: 16px;
  cursor: pointer;
}

.btn.secondary {
  background: #6b7280;
  cursor: not-allowed;
}

.preview {
  border: 1px solid #e5e7eb;
  background: #fafafa;
  padding: 16px;
  border-radius: 12px;
  line-height: 1.6;
}

.error {
  background: #fee2e2;
  color: #991b1b;
  padding: 12px;
  border-radius: 10px;
  margin-bottom: 16px;
}

.blog-item {
  border: 1px solid #e5e7eb;
  padding: 16px;
  border-radius: 12px;
  margin: 16px 0;
  background: #fafafa;
}

code {
  background: #eef2ff;
  padding: 4px 8px;
  border-radius: 6px;
}

.hidden-textarea {
  display: none;
}

hr {
  border: none;
  border-top: 1px solid #e5e7eb;
  margin: 24px 0;
}