:root {
  --bg: #0f1419;
  --panel: #1a2230;
  --panel-2: #212b3b;
  --text: #e6edf3;
  --muted: #8b98a9;
  --accent: #3b82f6;
  --accent-hover: #2f6fe0;
  --ok: #34d399;
  --err: #f87171;
  --border: #2b3648;
  --radius: 10px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

/* Ensure the `hidden` attribute always wins over layout rules like display:flex. */
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  display: flex;
  justify-content: center;
  padding: 2.5rem 1rem;
}

.app { width: 100%; max-width: 720px; }

header { margin-bottom: 1.5rem; }
header h1 { margin: 0 0 .25rem; font-size: 1.4rem; }
header p { margin: 0; color: var(--muted); font-size: .9rem; }

.status {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .85rem;
  font-weight: 600;
  padding: .35rem .75rem;
  border-radius: 99px;
  margin: 1rem 0;
}
.status::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: currentColor; }
.status.ok  { color: var(--ok);  background: rgba(52,211,153,.12); }
.status.off { color: var(--muted); background: rgba(139,152,169,.12); }

.controls { display: flex; flex-wrap: wrap; gap: .6rem; margin-bottom: 1.25rem; }

button {
  font: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: none;
  padding: .6rem 1.1rem;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .15s, opacity .15s;
}
button:hover:not(:disabled) { background: var(--accent-hover); }
button.secondary { background: var(--panel-2); }
button.secondary:hover:not(:disabled) { background: #2a3648; }
button.danger { background: transparent; color: var(--err); border: 1px solid var(--err); }
button.danger:hover:not(:disabled) { background: rgba(248,113,113,.12); }
button.ghost { background: transparent; color: var(--muted); border: 1px solid var(--border); }
button.ghost:hover:not(:disabled) { background: var(--panel-2); color: var(--text); }
button.lg { padding: .85rem 1.7rem; font-size: 1.05rem; border-radius: 12px; }
button:disabled { opacity: .4; cursor: not-allowed; }

.muted { color: var(--muted); }
.small { font-size: .8rem; }
.nowrap { white-space: nowrap; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  margin-bottom: 1.25rem;
}

/* Disconnected hero */
.connect-panel { text-align: center; padding: 2rem 1.25rem; }
.connect-panel .muted { margin: 1rem 0 0; font-size: .85rem; }
.connect-panel .muted.error { color: var(--err); }

/* Connected device identity bar */
.device-panel { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.device-info { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; }
.device-info .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 3px rgba(52,211,153,.15); flex: none; }
.device-name { font-weight: 700; font-size: 1.05rem; }
.device-meta { color: var(--muted); font-size: .85rem; font-variant-numeric: tabular-nums; }
.device-actions { display: flex; gap: .5rem; }

/* Primary action row */
.actions { display: flex; gap: .6rem; align-items: center; flex-wrap: wrap; margin-bottom: 1.25rem; }

/* Collapsible panels */
details.details { padding: 0; }
details.details > summary {
  cursor: pointer; list-style: none; user-select: none;
  padding: .95rem 1.25rem; font-weight: 600; color: var(--text);
  display: flex; align-items: center; gap: .55rem;
}
details.details > summary::-webkit-details-marker { display: none; }
details.details > summary::before { content: '▸'; color: var(--muted); transition: transform .15s; }
details.details[open] > summary::before { transform: rotate(90deg); }
details.details .details-body { padding: 0 1.25rem 1.15rem; }
details.details .details-body > :first-child { margin-top: 0; }
details.danger-zone { border-color: rgba(248,113,113,.5); }
details.danger-zone > summary { color: var(--err); }

.panel-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; margin-bottom: .85rem; font-weight: 600; flex-wrap: wrap; }

#result .model { font-size: 1.15rem; font-weight: 700; margin-bottom: .5rem; }
#result dl { display: grid; grid-template-columns: auto 1fr; gap: .3rem 1rem; margin: 0; }
#result dt { color: var(--muted); }
#result dd { margin: 0; }
code { background: var(--panel-2); padding: .1rem .4rem; border-radius: 5px; font-size: .9em; }

.serial { text-transform: none; letter-spacing: 0; color: var(--muted); font-weight: 400; margin-left: .4rem; }

.clock-row { display: flex; align-items: center; gap: .75rem; margin-bottom: .75rem; flex-wrap: wrap; }
.clock-row label { color: var(--muted); font-size: .85rem; }
#tz-select {
  font: inherit; color: var(--text); background: var(--panel-2);
  border: 1px solid var(--border); border-radius: 8px; padding: .45rem .6rem;
  min-width: 220px; max-width: 100%;
}
.clock-actions { display: flex; gap: .6rem; flex-wrap: wrap; }
.clock-readout { margin-top: .85rem; font-size: .9rem; display: grid; gap: .2rem; }
.clock-readout .drift { color: var(--muted); }
.read-progress { margin: 0 0 1.25rem; }
.read-progress .bar {
  height: 6px; border-radius: 99px; background: var(--panel-2);
  overflow: hidden; position: relative;
}
.read-progress .bar span {
  position: absolute; top: 0; left: 0; height: 100%; width: 35%;
  background: var(--accent); border-radius: 99px;
  animation: indeterminate 1.1s ease-in-out infinite;
}
@keyframes indeterminate {
  0%   { left: -35%; }
  100% { left: 100%; }
}
.read-progress-text { margin-top: .5rem; font-size: .85rem; font-variant-numeric: tabular-nums; }
.read-progress-warn { margin-top: .2rem; font-size: .8rem; color: var(--err); }

.pager { display: flex; align-items: center; gap: .75rem; margin-top: .9rem; flex-wrap: wrap; }
.pager button { padding: .35rem .8rem; font-size: .85rem; }
#pager-info { font-size: .85rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.pager-note { font-size: .78rem; color: var(--muted); margin-left: auto; }

.table-wrap { overflow-x: auto; }
#codes-table { width: 100%; border-collapse: collapse; font-size: .88rem; }
#codes-table th, #codes-table td { text-align: left; padding: .45rem .6rem; border-bottom: 1px solid var(--border); white-space: nowrap; }
#codes-table th { color: var(--muted); font-weight: 600; font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; }
#codes-table td.dim { color: var(--muted); }
#codes-table td.empty { text-align: center; color: var(--muted); padding: 1rem; }
#codes-table tbody tr:hover { background: var(--panel-2); }

.log-title { font-size: .8rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin-bottom: .5rem; }
#log {
  background: #0b0f14;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .75rem;
  height: 260px;
  overflow-y: auto;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: .8rem;
}
.log-line { padding: .1rem 0; white-space: pre-wrap; word-break: break-all; }
.log-line.ok  { color: var(--ok); }
.log-line.err { color: var(--err); }
.log-line.dim { color: var(--muted); }

.hint { font-size: .82rem; color: var(--muted); border-left: 3px solid var(--accent); padding: .5rem .8rem; background: rgba(59,130,246,.06); border-radius: 0 6px 6px 0; }
.hint ul { margin: .4rem 0 0; padding-left: 1.1rem; }