:root {
  color-scheme: light;
  --bg: #f3f5f8;
  --surface: #fff;
  --surface-alt: #f8fafc;
  --text: #17202a;
  --muted: #5f6b7a;
  --border: #d7dde6;
  --header: #162130;
  --header-text: #f9fbff;
  --accent: #2f6fed;
  --success: #1f9d55;
  --warning: #c58512;
  --danger: #c0392b;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}
button, input, select { font: inherit; }
.app-shell { min-height: 100vh; }
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.5rem;
  background: var(--header);
  color: var(--header-text);
}
.brand { font-size: 1.25rem; font-weight: 700; letter-spacing: 0.02em; }
.auth-controls, .tabs {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
}
.tabs {
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: #e9edf3;
  border-bottom: 1px solid var(--border);
}
.tab-button {
  padding: 0.65rem 1rem;
  border: 1px solid transparent;
  border-radius: 0.5rem;
  background: transparent;
  color: var(--text);
  cursor: pointer;
}
.tab-button.active { background: var(--surface); border-color: var(--border); font-weight: 600; }
.content { padding: 1.5rem; }
.panel, .card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1rem;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.05);
}
.stack, .form-grid { display: grid; gap: 1rem; }
.form-grid { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); align-items: end; }
label { display: grid; gap: 0.4rem; font-weight: 600; }
input, select {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: #fff;
}
button.primary, button.secondary {
  padding: 0.7rem 1rem;
  border: 0;
  border-radius: 0.5rem;
  cursor: pointer;
}
button.primary { background: var(--accent); color: #fff; }
button.secondary { background: #d9e4ff; color: #14325d; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td {
  padding: 0.75rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}
th { background: var(--surface-alt); font-size: 0.9rem; }
tbody tr:nth-child(even) { background: #fbfcfe; }
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 700;
}
.badge.success { background: #dff5e8; color: var(--success); }
.badge.warning { background: #fff3da; color: var(--warning); }
.badge.danger { background: #fbe3df; color: var(--danger); }
.alert {
  padding: 0.8rem 1rem;
  border-radius: 0.6rem;
  border: 1px solid var(--border);
}
.alert.success { background: #effaf3; border-color: #b8e4c6; }
.alert.error { background: #fff1ef; border-color: #efb6ae; }
.muted { color: var(--muted); }
.kv { display: grid; gap: 0.2rem; }
.small { font-size: 0.9rem; }
code { font-family: Consolas, "Courier New", monospace; }
@media (max-width: 720px) {
  .topbar, .tabs { padding-left: 1rem; padding-right: 1rem; }
  .content { padding: 1rem; }
}