:root {
  color-scheme: light dark;

  --bg-light: #f5f7fa;
  --bg-dark: #0e1116;
  --surface-light: #ffffff;
  --surface-dark: #161b22;
  --surface-muted-light: #eef2f6;
  --surface-muted-dark: #1f2630;
  --text-light: #111827;
  --text-dark: #f3f4f6;
  --muted-light: #4b5563;
  --muted-dark: #9ca3af;
  --border-light: #cbd5e1;
  --border-dark: #30363d;
  --brand-light: #0f52ba;
  --brand-dark: #58a6ff;
  --brand-fg-light: #ffffff;
  --brand-fg-dark: #071324;
  --danger-light: #b91c1c;
  --danger-dark: #f87171;
  --danger-fg-light: #ffffff;
  --danger-fg-dark: #2a0707;
  --ok-light: #15803d;
  --ok-dark: #4ade80;
  --warn-light: #a16207;
  --warn-dark: #facc15;
  --scroll-track-light: #e2e8f0;
  --scroll-track-dark: #1b222c;
  --scroll-thumb-light: #64748b;
  --scroll-thumb-dark: #6b7280;

  --bg: var(--bg-light);
  --surface: var(--surface-light);
  --surface-muted: var(--surface-muted-light);
  --text: var(--text-light);
  --muted: var(--muted-light);
  --border: var(--border-light);
  --brand: var(--brand-light);
  --brand-fg: var(--brand-fg-light);
  --danger: var(--danger-light);
  --danger-fg: var(--danger-fg-light);
  --ok: var(--ok-light);
  --warn: var(--warn-light);
  --scroll-track: var(--scroll-track-light);
  --scroll-thumb: var(--scroll-thumb-light);

  @media (prefers-color-scheme: dark) {
    --bg: var(--bg-dark);
    --surface: var(--surface-dark);
    --surface-muted: var(--surface-muted-dark);
    --text: var(--text-dark);
    --muted: var(--muted-dark);
    --border: var(--border-dark);
    --brand: var(--brand-dark);
    --brand-fg: var(--brand-fg-dark);
    --danger: var(--danger-dark);
    --danger-fg: var(--danger-fg-dark);
    --ok: var(--ok-dark);
    --warn: var(--warn-dark);
    --scroll-track: var(--scroll-track-dark);
    --scroll-thumb: var(--scroll-thumb-dark);
  }

  @supports (color: light-dark(white, black)) {
    --bg: light-dark(var(--bg-light), var(--bg-dark));
    --surface: light-dark(var(--surface-light), var(--surface-dark));
    --surface-muted: light-dark(var(--surface-muted-light), var(--surface-muted-dark));
    --text: light-dark(var(--text-light), var(--text-dark));
    --muted: light-dark(var(--muted-light), var(--muted-dark));
    --border: light-dark(var(--border-light), var(--border-dark));
    --brand: light-dark(var(--brand-light), var(--brand-dark));
    --brand-fg: light-dark(var(--brand-fg-light), var(--brand-fg-dark));
    --danger: light-dark(var(--danger-light), var(--danger-dark));
    --danger-fg: light-dark(var(--danger-fg-light), var(--danger-fg-dark));
    --ok: light-dark(var(--ok-light), var(--ok-dark));
    --warn: light-dark(var(--warn-light), var(--warn-dark));
    --scroll-track: light-dark(var(--scroll-track-light), var(--scroll-track-dark));
    --scroll-thumb: light-dark(var(--scroll-thumb-light), var(--scroll-thumb-dark));
  }

  accent-color: var(--brand);
  scrollbar-color: var(--scroll-thumb) var(--scroll-track);
  scrollbar-width: thin;
}

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

.container {
  max-inline-size: 72rem;
  margin-inline: auto;
  padding-inline: 1rem;
}

.topbar {
  background: var(--surface);
  border-block-end: 1px solid var(--border);
}

.topbar-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.85rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  inline-size: 2.25rem;
  block-size: 2.25rem;
  border-radius: 0.5rem;
  background: var(--brand);
  color: var(--brand-fg);
  font-weight: 700;
  font-size: 0.9rem;
}

.brand-title {
  margin: 0;
  font-weight: 700;
}

.brand-sub {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.topbar-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.user-pill {
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-muted);
  font-size: 0.875rem;
}

.main-content {
  padding-block: 2rem 3rem;
}

h1, h2 {
  line-height: 1.2;
  margin-block: 0 0.75rem;
}

.lead {
  color: var(--muted);
  margin-block: 0 1.25rem;
}

.status-banner {
  padding: 0.85rem 1rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
  background: var(--surface);
  margin-block-end: 1.25rem;
  font-weight: 500;
}

.status-banner[data-tone="error"] {
  border-color: var(--danger);
  color: var(--danger);
}

.status-banner[data-tone="ok"] {
  border-color: var(--ok);
  color: var(--ok);
}

.auth-shell {
  max-inline-size: 32rem;
  margin-inline: auto;
}

.mode-switch {
  display: flex;
  gap: 0.5rem;
  margin-block-end: 1rem;
}

.tab-btn {
  flex: 1;
  min-block-size: 48px;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.tab-btn[aria-selected="true"] {
  background: var(--brand);
  border-color: var(--brand);
  color: var(--brand-fg);
}

.card, .panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.25rem;
}

.panel {
  margin-block-start: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-block-end: 1.25rem;
}

.label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
}

label {
  font-weight: 600;
  display: inline-block;
  padding-block: 6px;
  margin-block: -6px;
}

input[type="text"],
input[type="email"],
input[type="password"] {
  font: inherit;
  font-size: max(1rem, 1em);
  min-block-size: 48px;
  inline-size: 100%;
  padding: 0.65rem 0.75rem;
  border-radius: 0.5rem;
  border: 1.5px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

input:user-invalid,
input[aria-invalid="true"] {
  border-color: var(--danger);
}

:focus-visible {
  outline: 3px solid var(--brand);
  outline-offset: 2px;
}

.field-help {
  margin: 0;
  font-size: 0.875rem;
  color: var(--muted);
}

.field-error {
  margin: 0;
  font-size: 0.875rem;
  color: var(--danger);
  min-block-size: 1.2em;
}

.toggle-pw-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  color: var(--text);
  font: inherit;
  font-size: 0.85rem;
  padding: 0.35rem 0.6rem;
  min-block-size: 36px;
  cursor: pointer;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  font: inherit;
  font-weight: 600;
  min-block-size: 48px;
  padding: 0.6rem 1rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
  cursor: pointer;
}

.btn:disabled {
  opacity: 0.65;
  cursor: wait;
}

.btn-primary {
  background: var(--brand);
  border-color: var(--brand);
  color: var(--brand-fg);
  inline-size: 100%;
}

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

.btn-danger {
  background: var(--danger);
  border-color: var(--danger);
  color: var(--danger-fg);
}

.btn-inline {
  min-block-size: 40px;
  padding: 0.35rem 0.75rem;
  font-size: 0.875rem;
}

.turnstile-slot {
  margin-block-end: 1.25rem;
}

.dashboard-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1rem;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(6.5rem, 1fr));
  gap: 0.75rem;
}

@media (max-width: 680px) {
  .summary-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    inline-size: 100%;
  }
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.65rem;
  padding: 0.75rem 0.9rem;
}

.stat-label {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
}

.stat-value {
  font-size: 1.35rem;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-block-end: 0.75rem;
}

.table-wrapper {
  overflow: auto;
  max-inline-size: 100%;
  max-block-size: min(520px, 75vh);
  container-type: inline-size;
  scrollbar-gutter: stable;
}

@supports not (scrollbar-color: auto) {
  .table-wrapper::-webkit-scrollbar {
    width: 10px;
    height: 10px;
  }
  .table-wrapper::-webkit-scrollbar-thumb {
    background: var(--scroll-thumb);
  }
  .table-wrapper::-webkit-scrollbar-track {
    background: var(--scroll-track);
  }
}

table {
  inline-size: 100%;
  border-collapse: separate;
  border-spacing: 0;
  text-align: start;
}

thead {
  position: sticky;
  inset-block-start: 0;
  z-index: 2;
  background: var(--surface-muted);
}

th, td {
  padding: 0.7rem 0.75rem;
  border-block-end: 1px solid var(--border);
  vertical-align: middle;
  white-space: nowrap;
}

tbody th {
  position: sticky;
  inset-inline-start: 0;
  z-index: 1;
  background: var(--surface);
  font-weight: 600;
}

.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.85rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  border: 1px solid var(--border);
}

.badge-online {
  border-color: var(--ok);
  color: var(--ok);
}

.badge-offline {
  color: var(--muted);
}

.badge-direct {
  border-color: var(--ok);
  color: var(--ok);
}

.badge-turn {
  border-color: var(--brand);
  color: var(--brand);
}

.badge-relay {
  border-color: var(--warn);
  color: var(--warn);
}

.empty-cell {
  white-space: normal;
  color: var(--muted);
  text-align: center;
  padding: 1.5rem 1rem;
}

@container (width < 640px) {
  table, thead, tbody, tr, th, td {
    display: block;
  }

  thead {
    display: none;
  }

  tr {
    margin-block-end: 1rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    overflow: hidden;
  }

  tbody th {
    position: sticky;
    inset-block-start: 0;
    z-index: 2;
    background: var(--surface-muted);
  }

  td {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    white-space: normal;
  }

  .devices-table {
    --d-label-2: "Status";
    --d-label-3: "Platform";
    --d-label-4: "Node";
    --d-label-5: "Fingerprint";
    --d-label-6: "Last Seen";
    --d-label-7: "Action";
  }

  .devices-table td:nth-child(2)::before { content: var(--d-label-2) ": "; font-weight: 600; color: var(--muted); }
  .devices-table td:nth-child(3)::before { content: var(--d-label-3) ": "; font-weight: 600; color: var(--muted); }
  .devices-table td:nth-child(4)::before { content: var(--d-label-4) ": "; font-weight: 600; color: var(--muted); }
  .devices-table td:nth-child(5)::before { content: var(--d-label-5) ": "; font-weight: 600; color: var(--muted); }
  .devices-table td:nth-child(6)::before { content: var(--d-label-6) ": "; font-weight: 600; color: var(--muted); }
  .devices-table td:nth-child(7)::before { content: var(--d-label-7) ": "; font-weight: 600; color: var(--muted); }

  .sessions-table {
    --s-label-2: "Transport";
    --s-label-3: "Duration";
    --s-label-4: "Ended Reason";
    --s-label-5: "Started";
  }

  .sessions-table td:nth-child(2)::before { content: var(--s-label-2) ": "; font-weight: 600; color: var(--muted); }
  .sessions-table td:nth-child(3)::before { content: var(--s-label-3) ": "; font-weight: 600; color: var(--muted); }
  .sessions-table td:nth-child(4)::before { content: var(--s-label-4) ": "; font-weight: 600; color: var(--muted); }
  .sessions-table td:nth-child(5)::before { content: var(--s-label-5) ": "; font-weight: 600; color: var(--muted); }
}

dialog[open] {
  display: block;
}

dialog {
  max-inline-size: min(28rem, calc(100vw - 2rem));
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--surface);
  color: var(--text);
  padding: 1.5rem;
}

dialog:modal {
  overscroll-behavior: contain;
}

dialog::backdrop {
  background: rgb(0 0 0 / 55%);
  overflow: hidden;
  overscroll-behavior: contain;
}

.dialog-device {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9rem;
  padding: 0.6rem 0.75rem;
  border-radius: 0.45rem;
  background: var(--surface-muted);
  overflow-wrap: anywhere;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-block-start: 1.25rem;
}

@media (pointer: coarse) {
  input[type="text"],
  input[type="email"],
  input[type="password"],
  .btn,
  .tab-btn {
    min-block-size: 52px;
  }
}