:root {
  --bg: #f7f8fa;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #d1d5db;
  --primary: #0f172a;
  --panel: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

.container {
  max-width: 760px;
  margin: 32px auto;
  padding: 20px;
  background: var(--panel);
  border: 1px solid var(--line);
}

h1, h2 {
  margin: 0 0 12px;
  font-weight: 600;
}

.hint {
  margin: 0 0 18px;
  color: var(--muted);
}

form {
  display: grid;
  gap: 12px;
}

.field {
  display: grid;
  gap: 6px;
}

.field.row {
  display: flex;
  align-items: center;
  gap: 10px;
}

input[type="file"],
input[type="text"] {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--line);
  background: #fff;
}

button {
  border: 1px solid var(--primary);
  background: var(--primary);
  color: #fff;
  padding: 10px 14px;
  cursor: pointer;
}

button:disabled {
  opacity: .7;
  cursor: not-allowed;
}

a {
  color: #0b4a9e;
}

pre {
  white-space: pre-wrap;
  word-break: break-word;
  background: #fff;
  border: 1px solid var(--line);
  padding: 12px;
  margin: 10px 0 0;
  max-height: 320px;
  overflow: auto;
}

.hidden {
  display: none;
}

.about {
  margin: 42px 0 6px;
  text-align: center;
  color: var(--muted);
}