:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --primary: #2f6fed;
  --primary-d: #2356c4;
  --ok: #1f9d55;
  --fail: #d9534f;
  --warn: #e08e0b;
  --text: #1f2733;
  --muted: #76828f;
  --border: #e3e8f0;
  --shadow: 0 2px 10px rgba(31, 39, 51, .06);
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--text); font-size: 14px;
}
a { color: var(--primary); text-decoration: none; }
header.topbar {
  background: #fff; border-bottom: 1px solid var(--border); padding: 12px 24px;
  display: flex; align-items: center; justify-content: space-between; position: sticky; top: 0; z-index: 10;
}
header .brand { font-weight: 700; font-size: 17px; }
header .brand small { color: var(--muted); font-weight: 400; margin-left: 8px; }
.container { max-width: 1100px; margin: 18px auto; padding: 0 18px; }
.tabs { display: flex; gap: 6px; margin: 0 0 16px; flex-wrap: wrap; }
.tabs button {
  border: 1px solid var(--border); background: #fff; padding: 8px 14px; border-radius: 8px;
  cursor: pointer; color: var(--text); font-size: 14px;
}
.tabs button.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 18px; box-shadow: var(--shadow); margin-bottom: 16px; }
.card h3 { margin: 0 0 14px; font-size: 15px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; }
.field { display: flex; flex-direction: column; gap: 4px; margin-bottom: 10px; }
.field label { font-size: 12px; color: var(--muted); }
input, select, textarea {
  border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; font-size: 14px;
  background: #fff; color: var(--text); width: 100%;
}
textarea { min-height: 70px; resize: vertical; }
button.btn {
  background: var(--primary); color: #fff; border: none; padding: 9px 16px; border-radius: 8px;
  cursor: pointer; font-size: 14px;
}
button.btn:hover { background: var(--primary-d); }
button.btn.ghost { background: #fff; color: var(--primary); border: 1px solid var(--primary); }
button.btn.danger { background: #fff; color: var(--fail); border: 1px solid var(--fail); }
button.btn.sm { padding: 5px 10px; font-size: 12px; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; background: #fafbfe; }
.badge { display: inline-block; padding: 2px 8px; border-radius: 20px; font-size: 12px; }
.badge.ok { background: #e6f6ec; color: var(--ok); }
.badge.fail { background: #fdeaea; color: var(--fail); }
.badge.warn { background: #fdf2e2; color: var(--warn); }
.badge.gray { background: #eef1f6; color: var(--muted); }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
.stat { background: #fafbff; border: 1px solid var(--border); border-radius: 10px; padding: 14px; }
.stat .n { font-size: 24px; font-weight: 700; color: var(--primary); }
.stat .l { color: var(--muted); font-size: 13px; }
.muted { color: var(--muted); }
.toast {
  position: fixed; left: 50%; bottom: 30px; transform: translateX(-50%); background: #1f2733;
  color: #fff; padding: 10px 18px; border-radius: 8px; opacity: 0; transition: .25s; pointer-events: none; z-index: 50;
}
.toast.show { opacity: 1; }
.participants-box { max-height: 220px; overflow: auto; border: 1px solid var(--border); border-radius: 8px; padding: 8px; }
.participants-box label { display: block; padding: 3px 0; }
.hidden { display: none !important; }
.q-opt { display: block; padding: 6px 10px; border: 1px solid var(--border); border-radius: 8px; margin: 6px 0; cursor: pointer; }
.q-opt.sel { border-color: var(--primary); background: #f0f5ff; }
.login-wrap { position: fixed; inset: 0; background: rgba(20, 28, 40, .55); display: flex; align-items: center; justify-content: center; z-index: 70; }
.login-wrap .card { max-width: 340px; width: 92%; }
.part-search { width: 100%; margin-bottom: 10px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; }
.part-empty { color: var(--muted); padding: 16px 0; text-align: center; }
.struct-row { display: flex; gap: 10px; align-items: center; }
.struct-row input { max-width: 90px; }
hr { border: none; border-top: 1px solid var(--border); margin: 14px 0; }
.pill { font-size: 12px; color: var(--muted); }
.pill.ok { color: var(--ok); background: #e6f6ec; padding: 4px 10px; border-radius: 8px; display: inline-block; }
.badge.info { background: #e7f0ff; color: var(--primary); }
.modal { position: fixed; inset: 0; background: rgba(20, 28, 40, .45); display: flex; align-items: center; justify-content: center; z-index: 60; }
.modal-card { background: #fff; border-radius: 12px; padding: 22px; width: min(520px, 92vw); box-shadow: var(--shadow); }
.modal-card h3 { margin: 0 0 12px; }
.modal-card .row { justify-content: flex-end; }