:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --ink: #24313f;
  --muted: #6b7a89;
  --line: #dde4ea;
  --accent: #2563eb;
  --accent-dark: #1e4fc0;
  --danger: #c23b3b;
  --warn-bg: #fef3c7;
  --ok-bg: #dcfce7;
  --radius: 10px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
}
code, .mono { font-family: Consolas, Menlo, monospace; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- top bar ---- */
.topbar {
  display: flex; align-items: center; gap: 28px;
  background: #16212e; color: #fff;
  padding: 0 24px; height: 52px;
}
.topbar .brand { color: #fff; font-weight: 700; letter-spacing: .5px; }
.topbar nav { display: flex; gap: 20px; flex: 1; }
.topbar nav a { color: #c6d2de; padding: 16px 2px; }
.topbar nav a:hover { color: #fff; text-decoration: none; border-bottom: 2px solid var(--accent); }
.topbar .logout { color: #9fb0c0; font-size: 13px; }

.container { max-width: 1080px; margin: 24px auto 64px; padding: 0 16px; }
h1 { font-size: 22px; margin: 8px 0 18px; }
h2 { font-size: 15px; margin: 0 0 12px; color: var(--muted); font-weight: 600; }

/* ---- panels & cards ---- */
.panel {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px 20px; margin-bottom: 20px;
}
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 20px; }
.card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px; text-align: center;
}
.card .num { font-size: 26px; font-weight: 700; }
.card .lbl { margin-top: 4px; color: var(--muted); font-size: 13px; }

/* ---- tables ---- */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: middle; }
th { color: var(--muted); font-weight: 600; font-size: 12.5px; white-space: nowrap; }
tbody tr:hover { background: #fafbfc; }
.empty { color: var(--muted); text-align: center; padding: 18px 0 !important; }
.small { font-size: 12px; }
.mono a { word-break: break-all; }

/* ---- forms ---- */
input[type=text], input[type=password], select, textarea {
  width: 100%; padding: 8px 10px; border: 1px solid var(--line);
  border-radius: 8px; font: inherit; background: #fff; color: var(--ink);
}
textarea { resize: vertical; font-family: monospace; font-size: 13px; }
button {
  font: inherit; cursor: pointer; border: 1px solid transparent;
  background: var(--accent); color: #fff; border-radius: 8px; padding: 8px 16px;
}
button:hover { background: var(--accent-dark); }
button.danger { background: transparent; color: var(--danger); border-color: currentColor; }
button.danger:hover { background: var(--danger); color: #fff; }
button.small { padding: 4px 10px; font-size: 12.5px; }
.inline-form { display: flex; gap: 10px; max-width: 480px; }
.grid-form { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
.grid-form label, .lbl-col { display: block; font-size: 13px; color: var(--muted); }
.grid-form label > input, .grid-form label > select { margin-top: 5px; }
.chk { display: flex; align-items: center; gap: 8px; margin: 12px 0; font-size: 14px; }
.row-actions { display: flex; align-items: center; gap: 12px; margin-top: 12px; flex-wrap: wrap; }
.hint { color: var(--muted); font-size: 12.5px; line-height: 1.6; }
.msg { min-height: 18px; margin: 8px 0 0; font-size: 13.5px; }
.msg.err { color: var(--danger); }
.msg.ok { color: #15803d; }

/* ---- badges / switch ---- */
.badge {
  display: inline-block; padding: 2px 9px; border-radius: 999px;
  background: #eef2f7; color: var(--muted); font-size: 12px; white-space: nowrap;
}
.badge.all { background: var(--ok-bg); color: #15803d; }
.badge.warn { background: var(--warn-bg); color: #92400e; }
.count { color: var(--muted); font-size: 13px; font-weight: 400; }
input.switch { transform: scale(1.35); accent-color: var(--accent); cursor: pointer; }

/* ---- progress ---- */
.progress-wrap { display: flex; align-items: center; gap: 10px; margin-top: 12px; }
.progress { flex: 1; height: 8px; background: #e7ecf1; border-radius: 999px; overflow: hidden; }
.progress .bar { height: 100%; width: 0; background: var(--accent); transition: width .15s; }

/* ---- groups ---- */
.group-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.group-card h2 { font-size: 17px; color: var(--ink); margin-bottom: 10px; }
.grp-bulk-form { display: flex; gap: 10px; margin-top: 12px; align-items: stretch; }
.grp-bulk-form textarea { flex: 1; }

/* ---- login ---- */
.login-body { display: flex; min-height: 100vh; align-items: center; justify-content: center; }
.login-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px;
  padding: 36px 40px; width: 360px; box-shadow: 0 10px 30px rgba(20, 40, 60, .08);
}
.login-card h1 { margin-top: 0; }
.login-card label { display: block; font-size: 13px; color: var(--muted); margin: 14px 0 6px; }
.login-card button { width: 100%; margin-top: 18px; padding: 10px; }
.err { color: var(--danger); font-size: 13.5px; }

.hidden { display: none !important; }

/* ---- protocol docs ---- */
.subh { font-size: 14px; margin: 16px 0 8px; color: var(--ink); font-weight: 600; }
.codeblock {
  background: #0f172a; color: #e2e8f0; border-radius: 8px;
  padding: 12px 14px; overflow-x: auto; font-family: Consolas, Menlo, monospace;
  font-size: 12.5px; line-height: 1.55; white-space: pre-wrap; word-break: break-all;
}
.doc-list { margin: 0; padding-left: 1.25rem; line-height: 1.75; font-size: 14px; }
.doc-list li { margin: 4px 0; }

@media (max-width: 720px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .topbar { gap: 14px; overflow-x: auto; }
  .grid-form { grid-template-columns: 1fr; }
}