body {
  font-family: 'Segoe UI', sans-serif;
  background: #f2f5f8;
  margin: 0;
  padding: 0;
}
header {
  background: #0057b7;
  color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 40px;
}
.logo { height: 50px; }
nav a {
  color: white;
  text-decoration: none;
  margin-left: 20px;
  font-weight: bold;
}
nav a:hover { text-decoration: underline; }
.container {
  max-width: 900px;
  background: white;
  margin: 30px auto;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 0 10px #ccc;
}
input[type=text], input[type=password], input[type=file] {
  width: 100%;
  padding: 10px;
  margin-bottom: 15px;
  border: 1px solid #ccc;
  border-radius: 6px;
}
button {
  background: #0057b7;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 6px;
  cursor: pointer;
}
button:hover { background: #004599; }
.message { color: green; font-weight: bold; }
.error { color: red; }
.docs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}
.doc-card {
  background: #eaf1ff;
  border-radius: 10px;
  padding: 15px;
  text-align: center;
  box-shadow: 0 0 5px #ccc;
}
.doc-card a {
  display: block;
  margin-top: 10px;
  text-decoration: none;
  color: #0057b7;
  font-weight: bold;
}
.viewer-container { width: 100%; height: 90vh; }
.viewer { width: 100%; height: 100%; border: none; }