:root {
  --bg-color: #f8f9fa;
  --bg-gradient: linear-gradient(180deg, #f8f9fa 0%, #e9ecef 100%);
  --card-bg: #ffffff;
  --text-primary: #2d3436;
  --text-secondary: #636e72;
  --accent-color: #0984e3;
  --added-color: #00b894;
  --removed-color: #d63031;
  --modified-color: #fdcb6e;
  --border-radius: 12px;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-color);
  background-image: url("data:image/svg+xml,%3Csvg width='52' height='26' viewBox='0 0 52 26' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23dfe6e9' fill-opacity='0.4'%3E%3Cpath d='M10 10c0-2.21-1.79-4-4-4-3.314 0-6-2.686-6-6h2c0 2.21 1.79 4 4 4 3.314 0 6 2.686 6 6 0 2.21 1.79 4 4 4 3.314 0 6 2.686 6 6 0 2.21 1.79 4 4 4v2c-3.314 0-6-2.686-6-6 0-2.21-1.79-4-4-4-3.314 0-6-2.686-6-6zm25.464-1.95l8.486 8.486-1.414 1.414-8.486-8.486 1.414-1.414z' /%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  color: var(--text-primary);
  margin: 0;
  padding: 0;
  line-height: 1.6;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 20px;
}

header {
  text-align: center;
  margin-bottom: 40px;
}

h1 {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

main {
  background-color: var(--card-bg);
  padding: 40px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.05);
}

.input-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin-bottom: 30px;
}

@media (max-width: 768px) {
  .input-group {
    grid-template-columns: 1fr;
  }
}

.input-wrapper {
  display: flex;
  flex-direction: column;
}

label {
  font-weight: 600;
  margin-bottom: 8px;
  font-size: 0.9rem;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

input {
  padding: 16px 18px;
  border: 1px solid #dfe6e9;
  background-color: #f8f9fa;
  border-radius: var(--border-radius);
  font-family: var(--font-body);
  font-size: 1.05rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

input:hover {
  border-color: #b2bec3;
}

input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 4px rgba(9, 132, 227, 0.1);
  background-color: #fff;
}

button {
  display: block;
  width: 100%;
  padding: 18px;
  background-image: linear-gradient(to right, var(--accent-color) 0%, #74b9ff 100%);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  margin-bottom: 30px;
  box-shadow: var(--shadow-sm);
}

button:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

button:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.status-message {
  text-align: center;
  min-height: 24px;
  margin-bottom: 20px;
  font-weight: 500;
  color: var(--text-secondary);
}

.hidden {
  display: none;
}

#resultsTitle {
  font-family: var(--font-heading);
  margin-bottom: 20px;
  border-bottom: 2px solid #dfe6e9;
  padding-bottom: 10px;
}

/* Summary Cards */
.summary-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.summary-card {
  background: var(--card-bg);
  padding: 20px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  text-align: center;
  border-bottom: 4px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.summary-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.summary-card.added { border-color: var(--added-color); }
.summary-card.removed { border-color: var(--removed-color); }
.summary-card.modified { border-color: var(--modified-color); }

.summary-card .count {
  font-size: 2.5rem;
  font-weight: 700;
  font-family: var(--font-heading);
  margin: 5px 0;
}

.summary-card .label {
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

/* Change Cards */
.change-card {
  background: var(--card-bg);
  padding: 16px 20px;
  margin-bottom: 16px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  border-left: 5px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.change-card:hover {
  transform: translate(5px, -2px);
  box-shadow: var(--shadow);
}

.change-card.added { border-left-color: var(--added-color); }
.change-card.removed { border-left-color: var(--removed-color); }
.change-card.modified { border-left-color: var(--modified-color); }

.card-content {
  display: flex;
  flex-direction: column;
}

.card-type {
  font-size: 0.75rem;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 2px;
}

.change-card.added .card-type { color: var(--added-color); }
.change-card.removed .card-type { color: var(--removed-color); }
.change-card.modified .card-type { color: var(--modified-color); }

.card-title {
  font-weight: 600;
  font-size: 1.1rem;
}