:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --border: #dfe4ea;
  --text: #1f2933;
  --muted: #6b7684;
  --primary: #1565c0;
  --primary-dark: #0d47a1;
  --danger: #c62828;
  --ok: #2e7d32;
  --radius: 10px;
  font-size: 15px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

/* ---------- header ---------- */
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 14px 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
}

.brand { display: flex; align-items: center; gap: 12px; }
.logo { font-size: 28px; }
h1 { margin: 0; font-size: 19px; }
.subtitle { color: var(--muted); font-size: 12.5px; }

.conn-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}
.conn-bar label { font-size: 13px; color: var(--muted); display: flex; align-items: center; gap: 5px; }
.conn-bar input[type="text"], .conn-bar input:not([type]) {
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
}
.demo-toggle { cursor: pointer; user-select: none; }

.status {
  font-size: 12.5px;
  padding: 4px 10px;
  border-radius: 999px;
  font-weight: 600;
}
.status.off { background: #eceff1; color: var(--muted); }
.status.on { background: #e8f5e9; color: var(--ok); }
.status.demo { background: #fff3e0; color: #e65100; }

/* ---------- nav ---------- */
nav {
  display: flex;
  gap: 4px;
  padding: 10px 24px 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.tab {
  border: none;
  background: none;
  padding: 10px 18px;
  font-size: 14.5px;
  color: var(--muted);
  cursor: pointer;
  border-bottom: 3px solid transparent;
}
.tab.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }
.tab:hover { color: var(--primary); }

main { padding: 24px; max-width: 1100px; margin: 0 auto; }

/* ---------- cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
}
.card .label { color: var(--muted); font-size: 12.5px; margin-bottom: 4px; }
.card .value { font-size: 17px; font-weight: 600; word-break: break-all; }
.card.big .value { font-size: 26px; color: var(--primary); }
.card.empty { grid-column: 1 / -1; color: var(--muted); text-align: center; padding: 40px; }

.actions { margin-top: 28px; }
.actions h2 { font-size: 15px; color: var(--muted); }
.actions button { margin-right: 10px; }

/* ---------- toolbar / tables ---------- */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 14px;
}
.toolbar input, .toolbar select {
  padding: 7px 9px;
  border: 1px solid var(--border);
  border-radius: 6px;
}
.toolbar label { font-size: 13px; color: var(--muted); display: flex; align-items: center; gap: 5px; }
#user-search { flex: 1; min-width: 180px; }
.count { color: var(--muted); font-size: 13px; margin-left: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
th, td { padding: 10px 14px; text-align: left; font-size: 14px; }
thead th {
  background: #f0f3f7;
  color: var(--muted);
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}
tbody tr { border-top: 1px solid var(--border); }
tbody tr:hover { background: #f8fafc; }

.badge {
  font-size: 12px;
  padding: 2px 9px;
  border-radius: 999px;
  font-weight: 600;
}
.badge.admin { background: #ede7f6; color: #5e35b1; }
.badge.user { background: #e3f2fd; color: var(--primary); }
.badge.in { background: #e8f5e9; color: var(--ok); }
.badge.out { background: #fbe9e7; color: #d84315; }

/* ---------- buttons ---------- */
button {
  font: inherit;
  padding: 8px 14px;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--surface);
  cursor: pointer;
}
button:hover { background: #f0f3f7; }
button.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  font-weight: 600;
}
button.primary:hover { background: var(--primary-dark); }
button.danger { color: var(--danger); border-color: #ef9a9a; }
button.danger:hover { background: #ffebee; }
button.icon {
  padding: 4px 9px;
  font-size: 13px;
}
button:disabled { opacity: 0.5; cursor: not-allowed; }

.empty-msg { color: var(--muted); text-align: center; padding: 30px; }

/* ---------- modal ---------- */
dialog {
  border: none;
  border-radius: var(--radius);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18);
  padding: 24px 28px;
  width: 340px;
}
dialog::backdrop { background: rgba(15, 23, 32, 0.45); }
dialog h2 { margin-top: 0; font-size: 17px; }
dialog label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 12px; }
dialog input, dialog select {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font: inherit;
}
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }

/* ---------- toast ---------- */
#toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: #263238;
  color: #fff;
  padding: 11px 20px;
  border-radius: 8px;
  font-size: 14px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.25);
  z-index: 100;
}
#toast.error { background: var(--danger); }

@media (max-width: 700px) {
  header { flex-direction: column; align-items: flex-start; }
  main { padding: 14px; }
  th, td { padding: 8px; font-size: 13px; }
}