:root {
  color-scheme: light;
  --ink: #1c1915;
  --muted: #5c564c;
  --line: #e4ddd0;
  --paper: #fff;
  --bg: #f4f1ea;
  --green: #1f6b4a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font: 16px/1.45 "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
}

main {
  max-width: 640px;
  margin: 48px auto;
  padding: 0 16px 48px;
}

h1 {
  font-size: 28px;
  font-weight: 650;
  margin: 0 0 8px;
}

h2 {
  font-size: 18px;
  margin: 28px 0 8px;
}

.lead, .hint {
  color: var(--muted);
}

.lead { margin-top: 0; }

form, .error, .ok {
  border-radius: 12px;
}

form {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 20px;
}

label {
  display: block;
  margin: 12px 0 6px;
  font-weight: 600;
}

input[type="file"],
input[type="number"] {
  width: 100%;
  font: inherit;
}

button {
  margin-top: 16px;
  background: var(--green);
  color: #fff;
  border: 0;
  border-radius: 8px;
  padding: 10px 16px;
  font: inherit;
  cursor: pointer;
}

.error, .ok {
  padding: 12px 14px;
  margin: 0 0 16px;
}

.error {
  background: #fde8e4;
  border: 1px solid #e7b2a8;
}

.ok {
  background: #e7f5ee;
  border: 1px solid #b7dcc8;
}

.download {
  margin-top: 16px;
}

.download a {
  color: var(--green);
  font-weight: 650;
}

ul {
  margin: 0;
  padding-left: 18px;
  max-height: 280px;
  overflow: auto;
  font-family: ui-monospace, monospace;
  font-size: 13px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 12px 12px 28px;
}