* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: #f5f7fb;
  color: #1f2937;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 32px 20px 60px;
}

.hero {
  text-align: center;
  margin-bottom: 24px;
}

.hero h1 {
  margin: 0 0 10px;
  font-size: 2.5rem;
}

.hero p {
  margin: 0;
  color: #4b5563;
}

.card,
.summary-card,
.diff-card {
  background: #ffffff;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
}

.card {
  padding: 24px;
}

.upload-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.upload-box {
  border: 1px solid #dbe3ee;
  border-radius: 14px;
  padding: 18px;
  background: #fafcff;
}

.upload-box label {
  display: block;
  font-weight: 700;
  margin-bottom: 12px;
}

.upload-box input[type="file"] {
  display: block;
  width: 100%;
  margin-bottom: 8px;
}

.upload-box small {
  color: #6b7280;
}

.actions {
  margin-top: 20px;
  text-align: center;
}

button {
  background: #111827;
  color: white;
  border: none;
  border-radius: 12px;
  padding: 12px 22px;
  font-size: 1rem;
  cursor: pointer;
}

button:hover {
  opacity: 0.95;
}

.status {
  margin-top: 20px;
  padding: 14px 16px;
  border-radius: 12px;
  background: #eef4ff;
  color: #1e3a8a;
}

.results {
  margin-top: 24px;
  display: grid;
  gap: 20px;
}

.summary-card,
.diff-card {
  padding: 20px;
}

.summary-card h2,
.diff-card h2 {
  margin-top: 0;
}

.diff-item {
  padding: 14px;
  border-radius: 12px;
  margin-bottom: 14px;
  border: 1px solid #e5e7eb;
}

.diff-type-added {
  background: #ecfdf5;
  border-color: #a7f3d0;
}

.diff-type-removed {
  background: #fef2f2;
  border-color: #fecaca;
}

.diff-type-modified {
  background: #fffbeb;
  border-color: #fde68a;
}

.diff-type-moved {
  background: #eff6ff;
  border-color: #bfdbfe;
}

.diff-label {
  font-weight: 700;
  margin-bottom: 8px;
}

.diff-text {
  white-space: pre-wrap;
  line-height: 1.5;
}

.count-list {
  display: grid;
  gap: 8px;
}

.hidden {
  display: none;
}

@media (max-width: 720px) {
  .upload-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 2rem;
  }
}