:root {
  color-scheme: light dark;
  --bg: #f4f5f7;
  --surface: #ffffff;
  --surface-alt: #f9fafb;
  --border: #e3e5e9;
  --text: #1c1e21;
  --text-muted: #6b7280;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-contrast: #ffffff;
  --success: #16a34a;
  --success-bg: #ecfdf3;
  --error: #dc2626;
  --error-bg: #fef2f2;
  --warn: #b45309;
  --warn-bg: #fffbeb;
  --info: #374151;
  --debug: #9ca3af;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .08);
  --shadow-lg: 0 4px 10px rgba(16, 24, 40, .08), 0 10px 24px rgba(16, 24, 40, .07);
  --accent-a: #2563eb;
  --accent-b: #7c3aed;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --surface: #1c1f24;
    --surface-alt: #22252b;
    --border: #2e3238;
    --text: #e7e9ec;
    --text-muted: #9aa1ab;
    --primary: #5b8dff;
    --primary-hover: #7ba0ff;
    --primary-contrast: #0b1020;
    --success: #4ade80;
    --success-bg: #0f2318;
    --error: #f87171;
    --error-bg: #2a1414;
    --warn: #fbbf24;
    --warn-bg: #2a2110;
    --info: #cbd0d6;
    --debug: #6b7280;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 12px rgba(0, 0, 0, .25);
    --shadow-lg: 0 6px 16px rgba(0, 0, 0, .35), 0 14px 32px rgba(0, 0, 0, .3);
    --accent-a: #5b8dff;
    --accent-b: #a78bfa;
  }
}

* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1rem 4rem;
  line-height: 1.5;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color .15s ease;
}
a:hover {
  text-decoration: underline;
}

.topnav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 0 -1rem 2rem;
  padding: 1rem 1rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
}
.topnav-brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text) !important;
  text-decoration: none !important;
  display: flex;
  align-items: center;
  gap: .4rem;
}
.topnav-links {
  display: flex;
  align-items: center;
  gap: .3rem;
  font-size: .88rem;
  font-weight: 500;
}
.topnav-links a {
  color: var(--text-muted);
  padding: .4rem .8rem;
  border-radius: 999px;
  text-decoration: none !important;
  transition: background .15s ease, color .15s ease;
}
.topnav-links a:hover {
  background: var(--surface-alt);
  color: var(--text);
}
.topnav-links a.active {
  background: linear-gradient(135deg, var(--accent-a), var(--accent-b));
  color: #fff;
}
.topnav-links a.logout-link {
  margin-left: .5rem;
  color: var(--text-muted);
}

h1 {
  font-size: 1.5rem;
  margin: 0 0 .3rem;
}

.page-lede {
  color: var(--text-muted);
  font-size: .9rem;
  margin: 0 0 1.5rem;
}

h2 {
  font-size: 1.05rem;
  margin: 2rem 0 .75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  flex-wrap: wrap;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: .9rem;
  margin: 0 0 1.75rem;
}
.stat-tile {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  box-shadow: var(--shadow);
}
.stat-label {
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--text-muted);
  font-weight: 600;
}
.stat-value {
  font-size: 1.4rem;
  font-weight: 700;
  margin-top: .3rem;
}
.stat-hint {
  font-size: .78rem;
  color: var(--text-muted);
  margin-top: .2rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  margin: 0 0 1.5rem;
  transition: box-shadow .2s ease;
}
.card:focus-within {
  box-shadow: var(--shadow-lg);
}

form.card {
  max-width: 420px;
}

label {
  display: block;
  margin: .8rem 0 .3rem;
  font-size: .85rem;
  font-weight: 500;
  color: var(--text-muted);
}
label:first-child {
  margin-top: 0;
}
label.checkbox-label {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .9rem;
  color: var(--text);
}

input[type=text],
input[type=number],
input[type=password],
select,
textarea {
  width: 100%;
  padding: .55rem .7rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-alt);
  color: var(--text);
  font-size: .9rem;
  font-family: inherit;
}
input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 20%, transparent);
}
textarea {
  min-height: 5.5rem;
  resize: vertical;
}
input[type=checkbox] {
  width: 1rem;
  height: 1rem;
  accent-color: var(--primary);
}

button {
  font-family: inherit;
  font-size: .9rem;
  font-weight: 600;
  padding: .55rem 1.1rem;
  border-radius: 8px;
  border: 1px solid var(--primary);
  background: var(--primary);
  color: var(--primary-contrast);
  cursor: pointer;
  transition: background .15s ease, border-color .15s ease, transform .1s ease;
}
button:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}
button:active {
  transform: translateY(1px);
}
button.secondary {
  background: var(--surface-alt);
  color: var(--text);
  border-color: var(--border);
  font-weight: 500;
}
button.secondary:hover {
  background: var(--border);
}

form.inline {
  display: inline;
  margin: 0;
  padding: 0;
  border: none;
  box-shadow: none;
  max-width: none;
}

.actions-row {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.notice,
.error-box {
  padding: .7rem 1rem;
  border-radius: 8px;
  font-size: .88rem;
  margin: 0 0 1.25rem;
  border: 1px solid transparent;
}
.notice {
  color: var(--success);
  background: var(--success-bg);
  border-color: color-mix(in srgb, var(--success) 30%, transparent);
}
.error-box {
  color: var(--error);
  background: var(--error-bg);
  border-color: color-mix(in srgb, var(--error) 30%, transparent);
}

.table-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
table {
  border-collapse: collapse;
  width: 100%;
  font-size: .85rem;
}
th, td {
  padding: .6rem .85rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
th {
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .03em;
  color: var(--text-muted);
  background: var(--surface-alt);
}
tr:last-child td {
  border-bottom: none;
}
tbody tr {
  transition: background .12s ease;
}
tbody tr:hover {
  background: var(--surface-alt);
}

.empty-state {
  padding: 2.5rem 1rem;
  text-align: center;
  color: var(--text-muted);
  font-size: .88rem;
}
.empty-state .empty-icon {
  font-size: 1.8rem;
  display: block;
  margin-bottom: .4rem;
  opacity: .7;
}

.status-chip {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .4rem .9rem;
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 600;
  margin: 0 0 1.5rem;
}
.status-chip .dot {
  width: .5rem;
  height: .5rem;
  border-radius: 50%;
  background: currentColor;
}
.status-chip.on {
  color: var(--success);
  background: var(--success-bg);
}
.status-chip.off {
  color: var(--text-muted);
  background: var(--surface-alt);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .15rem .55rem;
  border-radius: 999px;
  font-size: .72rem;
  font-weight: 600;
}
.badge::before {
  content: "";
  width: .4rem;
  height: .4rem;
  border-radius: 50%;
  background: currentColor;
  flex: none;
}
.badge-info { color: var(--info); background: var(--surface-alt); }
.badge-warn { color: var(--warn); background: var(--warn-bg); }
.badge-error { color: var(--error); background: var(--error-bg); }
.badge-debug { color: var(--debug); background: var(--surface-alt); }
.badge-in { color: var(--primary); background: color-mix(in srgb, var(--primary) 14%, transparent); }
.badge-out { color: var(--success); background: var(--success-bg); }

code {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  padding: .15rem .4rem;
  border-radius: 5px;
  word-break: break-all;
  display: inline-block;
  margin-top: .3rem;
  font-size: .82rem;
}

.hint {
  color: var(--text-muted);
  font-size: .82rem;
  margin: -.4rem 0 1.25rem;
}