body {
  font-family: Arial, sans-serif;
  background: #f5f6f8;
  margin: 0;
  padding: 0;
  color: #111827;
}

.container {
  max-width: 1100px;
  margin: 32px auto;
  padding: 20px;
}

h1 {
  margin-bottom: 8px;
}

p {
  line-height: 1.5;
}

.card {
  background: white;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

input[type="file"] {
  max-width: 100%;
}

button {
  padding: 10px 18px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background: #2563eb;
  color: white;
  font-size: 16px;
  margin-left: 8px;
}

button:hover {
  background: #1d4ed8;
}

.hidden {
  display: none;
}

.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 20px;
}

.compare-box {
  text-align: center;
}

.compare-box img {
  max-width: 100%;
  max-height: 420px;
  object-fit: contain;
  border-radius: 8px;
  background: #f8fafc;
  padding: 8px;
}

.result-image {
  max-width: 100%;
}

#status {
  margin-top: 16px;
  font-weight: 600;
}

.diagnostics-card {
  margin-top: 20px;
}

.diag-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.diag-block {
  background: #f8fafc;
  border-radius: 10px;
  padding: 14px;
  text-align: left;
  border: 1px solid #e5e7eb;
}

.diag-block h3 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 18px;
}

.diag-block p {
  margin: 6px 0;
  word-break: break-word;
}

.diag-list {
  margin: 6px 0 0 18px;
  padding: 0;
}

@media (max-width: 900px) {
  .compare-grid,
  .diag-grid {
    grid-template-columns: 1fr;
  }

  button {
    margin-left: 0;
    margin-top: 10px;
  }
}