body {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #10151a;
  color: #e0e0e0;
}

.intro {
  padding: 40px 30px 30px 30px;
  background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
  color: #e0e0e0;
  border-bottom: 1px solid #333;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.intro h1 {
  font-size: 28px;
  margin-bottom: 12px;
  color: #ffffff;
  letter-spacing: 1px;
  text-shadow: 0 0 4px rgba(255, 255, 255, 0.1);
  border-left: 6px solid #5c6ac4;
  padding-left: 12px;
  font-weight: 600;
}

.intro p {
  font-size: 15px;
  margin: 10px 0 16px 0;
  line-height: 1.6;
  color: #dddddd;
}

.intro ul {
  padding-left: 24px;
  margin: 0 0 16px 0;
  font-size: 14px;
  color: #cfd8dc;
  line-height: 1.5;
}

.intro li {
  margin-bottom: 8px;
}

code {
  background-color: #263238;
  color: #80cbc4;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
  font-family: 'Courier New', Courier, monospace;
}

.container {
  display: grid;
  grid-template-columns: 1fr 2fr 2fr;
  gap: 20px;
  padding: 30px;
  max-width: 100%;
  box-sizing: border-box;
}

.column {
  background: #1e272e;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(4px);
}

h2 {
  margin-top: 0;
  font-size: 18px;
  color: #ffffff;
  border-bottom: 2px solid #3d3d3d;
  padding-bottom: 10px;
}

form.form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

input[type="text"],
input[type="email"] {
  padding: 10px;
  font-size: 14px;
  border: 1px solid #555;
  border-radius: 6px;
  outline: none;
  background-color: #2c3e50;
  color: #fff;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus {
  border-color: #5c6ac4;
  box-shadow: 0 0 0 2px rgba(92, 106, 196, 0.2);
}

button {
  background-color: #5c6ac4;
  color: #fff;
  padding: 10px;
  font-size: 14px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #4b58a4;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  background-color: #2c3e50;
  color: #fff;
  border-radius: 8px;
  overflow: hidden;
}

th,
td {
  padding: 6px 8px;
  text-align: left;
  border-bottom: 1px solid #3d3d3d;
}

th {
  background-color: #3a3a3a;
  font-weight: 600;
  color: #fff;
}

.log-wrapper {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  margin-top: 16px;
  gap: 2px;
  max-height: 500px;
  overflow-y: auto;
  font-family: monospace;
  font-size: 13px;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.4;
  background-color: #111;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid #333;
}

.pass-line {
  background-color: rgba(76, 175, 80, 0.15);
  padding: 2px 4px;
  border-radius: 4px;
  color: #b2ff59;
}

.fail-line {
  background-color: rgba(244, 67, 54, 0.15);
  padding: 2px 4px;
  border-radius: 4px;
  color: #ef9a9a;
}