:root {
  color: #172033;
  background: #f4f7fb;
  font-family: "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

* { box-sizing: border-box; }

body { margin: 0; }

.page-shell {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

header { margin-bottom: 24px; }
h1 { margin-bottom: 8px; }
h2 { margin-top: 0; font-size: 1.25rem; }

.card {
  margin: 18px 0;
  padding: 24px;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 2px 10px rgba(23, 32, 51, 0.1);
}

.warning, .metadata { color: #566178; }
.warning { font-weight: 600; }

form { display: grid; gap: 12px; margin-top: 16px; }
label { font-weight: 600; }
input, textarea, button {
  font: inherit;
  padding: 10px 12px;
  border-radius: 6px;
}
input, textarea { border: 1px solid #b8c2d1; }
textarea { resize: vertical; }
button {
  width: fit-content;
  border: 0;
  color: #fff;
  background: #1c63bd;
  cursor: pointer;
}
button:hover { background: #144b90; }
button:disabled { background: #9aa5b5; cursor: not-allowed; }

.message { margin: 16px 0; padding: 12px 14px; border-radius: 6px; }
.message p { margin-top: 0; }
.message ul { margin-bottom: 0; }
.error { color: #9c1c1c; background: #fdeeee; border-left: 4px solid #c62828; }
.success { color: #1a6630; background: #e9f7ed; border-left: 4px solid #278744; }