:root {
  --surface-1: #fcfcfb;
  --page: #f9f9f7;
  --text-primary: #0b0b0b;
  --text-secondary: #52514e;
  --text-muted: #898781;
  --gridline: #e1e0d9;
  --border: rgba(11, 11, 11, 0.10);
  --accent: #2a78d6;
  --good: #0ca30c;
  --warning: #fab219;
  --serious: #ec835a;
  --critical: #d03b3b;
}

:root[data-theme="dark"] {
  --surface-1: #1a1a19;
  --page: #0d0d0d;
  --text-primary: #ffffff;
  --text-secondary: #c3c2b7;
  --text-muted: #898781;
  --gridline: #2c2c2a;
  --border: rgba(255, 255, 255, 0.10);
  --accent: #3987e5;
  --good: #0ca30c;
  --warning: #fab219;
  --serious: #ec835a;
  --critical: #d03b3b;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --surface-1: #1a1a19;
    --page: #0d0d0d;
    --text-primary: #ffffff;
    --text-secondary: #c3c2b7;
    --text-muted: #898781;
    --gridline: #2c2c2a;
    --border: rgba(255, 255, 255, 0.10);
    --accent: #3987e5;
  }
}

* { box-sizing: border-box; }

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

.muted { color: var(--text-secondary); }

.view { min-height: 100vh; }
.view[hidden] { display: none; }

/* Login */
#login-view {
  display: flex;
  align-items: center;
  justify-content: center;
}
.login-card {
  width: min(360px, 90vw);
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.login-card h1 { margin: 0; font-size: 1.4rem; }
.login-card label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.login-card input {
  font-size: 1rem;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--page);
  color: var(--text-primary);
}
.login-card button {
  margin-top: 8px;
  padding: 10px;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
}
.error { color: var(--critical); font-size: 0.85rem; }

/* App shell */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--gridline);
}
.topbar h1 { font-size: 1.1rem; margin: 0; }
button.ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: 8px;
  padding: 6px 14px;
  cursor: pointer;
}

.tabs {
  display: flex;
  gap: 4px;
  padding: 12px 24px 0;
  border-bottom: 1px solid var(--gridline);
}
.tab-btn {
  background: transparent;
  border: none;
  padding: 10px 14px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
}
.tab-btn.active {
  color: var(--text-primary);
  border-bottom-color: var(--accent);
}

main { padding: 20px 24px 60px; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* Dongle status cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}
.dongle-card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
}
.dongle-card h3 { margin: 0 0 12px; font-size: 1rem; }
.signal-row {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  margin-bottom: 6px;
}
.signal-bar {
  width: 8px;
  background: var(--gridline);
  border-radius: 2px;
}
.signal-bar:nth-child(1) { height: 8px; }
.signal-bar:nth-child(2) { height: 14px; }
.signal-bar:nth-child(3) { height: 20px; }
.signal-bar:nth-child(4) { height: 26px; }
.signal-bar.on.good { background: var(--good); }
.signal-bar.on.warning { background: var(--warning); }
.signal-bar.on.serious { background: var(--serious); }
.signal-bar.on.critical { background: var(--critical); }
.signal-label {
  font-weight: 600;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 10px;
}
.status-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.status-dot.good { background: var(--good); }
.status-dot.warning { background: var(--warning); }
.status-dot.serious { background: var(--serious); }
.status-dot.critical { background: var(--critical); }

.kv { font-size: 0.85rem; color: var(--text-secondary); display: grid; grid-template-columns: auto 1fr; gap: 4px 10px; }
.kv dt { color: var(--text-muted); }
.kv dd { margin: 0; }

/* Tables */
.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.data-table th, .data-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--gridline);
  font-size: 0.88rem;
}
.data-table th {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.data-table tbody tr:last-child td { border-bottom: none; }

.pager {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.pager button {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
  cursor: pointer;
  color: var(--text-primary);
}
.pager button:disabled { opacity: 0.4; cursor: default; }

.empty-msg { color: var(--text-muted); padding: 20px; text-align: center; }