:root {
  --border: #ddd;
  --bg: #fff;
  --fg: #222;
  --muted: #666;
  --accent: #2a5db0;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.5;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  border-bottom: 1px solid var(--border);
}

header a {
  color: var(--fg);
  text-decoration: none;
  font-weight: 600;
}

header nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

header nav a {
  font-weight: 400;
  color: var(--accent);
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px;
}

h1 {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

p.error {
  color: #b00;
}

.conflict {
  background: #ffe0e0;
}

form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 420px;
}

form label {
  display: block;
  font-size: 0.9rem;
  color: var(--muted);
}

form input {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 1rem;
}

form button {
  align-self: flex-start;
  padding: 8px 16px;
  border: none;
  border-radius: 4px;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
}

form button:hover {
  opacity: 0.9;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 16px;
}

table th, table td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
}

table th {
  background: #f5f5f5;
}

.search-form {
  max-width: 420px;
}

.split {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.split .scans {
  flex: 1 1 320px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: sticky;
  top: 16px;
}

.split .scans img {
  max-width: 100%;
  border: 1px solid var(--border);
  border-radius: 4px;
}

.split form {
  flex: 1 1 420px;
}

.hint {
  color: #b00;
  font-size: 0.8rem;
}