:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #2563eb;
  --accent-soft: #dbeafe;
  --danger: #b91c1c;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}
.app { max-width: 880px; margin: 0 auto; padding: 24px 16px 64px; }
.topbar { margin-bottom: 24px; }
.brand { display: flex; align-items: center; gap: 14px; }
.logo {
  width: 44px; height: 44px; border-radius: 12px;
  background: var(--accent); color: #fff; font-size: 22px;
  display: flex; align-items: center; justify-content: center;
}
.brand h1 { margin: 0; font-size: 19px; }
.brand p { margin: 2px 0 0; color: var(--muted); font-size: 13px; }
.content { display: flex; flex-direction: column; gap: 20px; }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 22px; box-shadow: 0 1px 2px rgba(0,0,0,.03);
}
.card h2 { margin: 0 0 16px; font-size: 16px; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 640px) { .grid { grid-template-columns: 1fr; } }
label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 5px; }
input, textarea {
  width: 100%; padding: 10px 12px; font-size: 14px;
  border: 1px solid var(--border); border-radius: 9px; background: #fff;
  color: var(--text); font-family: inherit; resize: vertical;
}
input:focus, textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.actions { display: flex; gap: 10px; align-items: center; margin-top: 18px; flex-wrap: wrap; }
button { font-size: 14px; font-weight: 600; border-radius: 9px; padding: 10px 18px; cursor: pointer; border: 1px solid transparent; }
button:disabled { opacity: .6; cursor: default; }
.primary { background: var(--accent); color: #fff; }
.primary:hover:not(:disabled) { background: #1d4ed8; }
.ghost { background: #fff; border-color: var(--border); color: var(--text); }
.ghost:hover:not(:disabled) { background: #f3f4f6; }
.attachments { margin: 14px 0 4px; display: flex; gap: 8px; flex-wrap: wrap; }
.chip { display: inline-block; background: var(--accent-soft); color: var(--accent); border-radius: 999px; padding: 5px 12px; font-size: 12px; font-weight: 600; }
.status { font-size: 13px; }
.bg-panel { margin-top: 8px; font-size: 12px; color: var(--muted); }
.bg-panel summary { cursor: pointer; }
.bg-panel > div { white-space: pre-wrap; border-top: 1px solid var(--border); margin-top: 8px; padding-top: 10px; max-height: 280px; overflow: auto; }