:root {
  --bg: #0f1115;
  --surface: #1a1d24;
  --surface-2: #232730;
  --border: #2d323c;
  --text: #e6e8ec;
  --text-muted: #8a90a0;
  --primary: #5b8def;
  --primary-hover: #4a7be0;
  --danger: #e35757;
  --ok: #4caf6a;
  --warn: #d4a657;
  --tag-bg: #2d323c;
  --radius: 8px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  line-height: 1.5;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); }
code { font-family: ui-monospace, "SF Mono", Consolas, monospace; background: var(--surface-2); padding: 0 4px; border-radius: 3px; }

/* Topbar */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.brand {
  font-weight: 600;
  font-size: 16px;
  color: var(--text);
}
.topbar-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Content */
.content {
  max-width: 960px;
  margin: 32px auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Card */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
}
.card-narrow {
  max-width: 380px;
  margin: 0 auto;
}
.card h1 { margin: 0 0 16px; font-size: 20px; }
.card h2 { margin: 24px 0 12px; font-size: 15px; color: var(--text-muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; }
.card p { margin: 0 0 12px; }
.muted { color: var(--text-muted); }

/* Form */
.form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.form label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
  color: var(--text-muted);
}
.form input {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 8px 10px;
  font-size: 14px;
  font-family: inherit;
}
.form input:focus {
  outline: none;
  border-color: var(--primary);
}
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.span-2 { grid-column: span 2; }

/* Buttons */
.btn-primary {
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 6px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  align-self: flex-start;
  margin-top: 8px;
}
.btn-primary:hover { background: var(--primary-hover); }

/* Alerts */
.alert {
  border-radius: 6px;
  padding: 10px 14px;
  border: 1px solid;
}
.alert-error {
  background: rgba(227, 87, 87, 0.1);
  border-color: var(--danger);
  color: #ffd1d1;
}

/* Tables */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
}
.data-table th, .data-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.data-table th {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Tags */
.tag {
  display: inline-block;
  font-size: 11px;
  padding: 2px 8px;
  background: var(--tag-bg);
  border-radius: 999px;
  color: var(--text);
}
.tag-admin { background: rgba(91, 141, 239, 0.2); color: var(--primary); }
.tag-running { background: rgba(76, 175, 106, 0.2); color: var(--ok); }
.tag-stopped { background: rgba(138, 144, 160, 0.2); color: var(--text-muted); }
.tag-locked { background: rgba(212, 166, 87, 0.2); color: var(--warn); }

/* Inline button-as-link (for action columns in admin table) */
.btn-link {
  background: transparent;
  border: none;
  color: var(--primary);
  cursor: pointer;
  padding: 4px 8px;
  font-size: 13px;
  font-family: inherit;
  border-radius: 4px;
}
.btn-link:hover:not(:disabled) {
  background: rgba(91, 141, 239, 0.1);
}
.btn-link:disabled {
  color: var(--text-muted);
  cursor: not-allowed;
}
.btn-link-danger { color: var(--danger); }
.btn-link-danger:hover:not(:disabled) { background: rgba(227, 87, 87, 0.1); }

.col-actions {
  white-space: nowrap;
  display: flex;
  gap: 4px;
  align-items: center;
}

/* Inline form (admin "create user") */
.form-inline {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr auto;
  gap: 12px;
  align-items: end;
}
.form-inline .btn-primary { align-self: end; margin-top: 0; }

/* Impersonation pill in topbar */
.impersonation-pill {
  background: rgba(212, 166, 87, 0.15);
  color: var(--warn);
  border: 1px solid var(--warn);
  border-radius: 999px;
  padding: 2px 12px;
  font-size: 12px;
  font-weight: 500;
}