body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f3f4f6;
  color: #333;
}

.sidebar {
  height: 100vh;
  width: 220px;
  position: fixed;
  top: 0;
  left: 0;
  background: #111827;
  padding-top: 20px;
  display: flex;
  flex-direction: column;
}

.sidebar a {
  padding: 15px 20px;
  text-decoration: none;
  font-size: 16px;
  color: #d1d5db;
  transition: background 0.2s, color 0.2s;
}

.sidebar a:hover,
.sidebar a.active {
  background-color: #2563eb;
  color: white;
  border-left: 4px solid #60a5fa;
}

.main {
  margin-left: 240px;
  padding: 30px;
}

h2 {
  margin-bottom: 20px;
  color: #1f2937;
}

input[type="file"] {
  padding: 10px;
  background-color: white;
  border: 1px solid #ccc;
  border-radius: 8px;
  margin-bottom: 10px;
}

button {
  background-color: #2563eb;
  color: white;
  border: none;
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.3s ease;
  margin-left: 10px;
}

button:hover {
  background-color: #1d4ed8;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 25px;
  background: white;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

th, td {
  padding: 15px;
  text-align: left;
  border-bottom: 1px solid #e5e7eb;
}

th {
  background-color: #f9fafb;
  font-weight: 600;
  color: #374151;
}

tr:hover {
  background-color: #f3f4f6;
}

#previewArea {
  margin-top: 20px;
  border-radius: 8px;
  background: #ffffff;
  padding: 10px;
  box-shadow: inset 0 0 10px rgba(0,0,0,0.05);
}

body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f3f4f6;
  color: #333;
}

.sidebar {
  height: 100vh;
  width: 220px;
  position: fixed;
  top: 0;
  left: 0;
  background: #111827;
  padding-top: 20px;
  display: flex;
  flex-direction: column;
}

.sidebar a {
  padding: 15px 20px;
  text-decoration: none;
  font-size: 16px;
  color: #d1d5db;
  transition: background 0.2s, color 0.2s;
}

.sidebar a:hover,
.sidebar a.active {
  background-color: #2563eb;
  color: white;
  border-left: 4px solid #60a5fa;
}

.main {
  margin-left: 240px;
  padding: 30px;
}

h2 {
  margin-bottom: 20px;
  color: #1f2937;
}

input[type="file"] {
  padding: 10px;
  background-color: white;
  border: 1px solid #ccc;
  border-radius: 8px;
  margin-bottom: 10px;
}

button {
  background-color: #2563eb;
  color: white;
  border: none;
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.3s ease;
  margin-left: 10px;
}

button:hover {
  background-color: #1d4ed8;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 25px;
  background: white;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

th, td {
  padding: 15px;
  text-align: left;
  border-bottom: 1px solid #e5e7eb;
}

th {
  background-color: #f9fafb;
  font-weight: 600;
  color: #374151;
}

tr:hover {
  background-color: #f3f4f6;
}

#previewArea {
  margin-top: 20px;
  border-radius: 8px;
  background: #ffffff;
  padding: 10px;
  box-shadow: inset 0 0 10px rgba(0,0,0,0.05);
}