:root {
  --bg: #15110e;
  --card: #1f1915;
  --ink: #efe6d8;
  --muted: #a69684;
  --line: #3a2f27;
  --glow: #ff8c1a;      /* nixie orange */
  --glow-dim: #b95f0e;
  --ok: #7ad17a;
  --warn: #e8b84a;
  --err: #ef6a5a;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 0 16px 32px;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif;
}
body.busy { cursor: progress; }
header {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 12px; padding: 18px 0 8px;
}
h1 { margin: 0; font-size: 1.5rem; font-weight: 600; letter-spacing: .02em; }
h1::before { content: "●"; color: var(--glow); margin-right: .5em; text-shadow: 0 0 10px var(--glow); }
h2 { margin: 0 0 10px; font-size: 1.05rem; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: .06em; }
.any { display: block; margin-top: 10px; color: var(--muted); font-size: .9rem; }
.help { margin: 0 0 12px; }
body:not(.connected) .only-connected { display: none; }
body.connected .only-disconnected { display: none; }
.details { border-collapse: collapse; }
.details th { text-align: left; font-weight: 500; color: var(--muted); padding: 3px 12px 3px 0; }
.details td { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9rem; }

button {
  background: var(--card); color: var(--ink); border: 1px solid var(--line);
  border-radius: 6px; padding: 7px 14px; font: inherit; cursor: pointer;
}
button:hover:not(:disabled) { border-color: var(--glow-dim); }
button:disabled { opacity: .45; cursor: default; }
button.primary { background: var(--glow-dim); border-color: var(--glow); }
button.primary:hover:not(:disabled) { background: var(--glow); color: #1a1008; }
button.small { padding: 2px 8px; font-size: .8rem; text-transform: none; letter-spacing: 0; margin-left: 8px; }

.status { margin: 0 0 10px; font-weight: 600; }
.status.ok { color: var(--ok); }
.status.warn { color: var(--warn); }
.status.err { color: var(--err); }
.banner { padding: 10px 14px; border-radius: 6px; border: 1px solid var(--line); }
.banner.err { border-color: var(--err); color: var(--err); }
.banner p { margin: 4px 0; }
.banner a { color: var(--ink); }

main { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 16px; }
#connection { grid-column: 1 / -1; }
body.connected #connection { padding: 8px 16px; }
.statusline { display: flex; flex-wrap: wrap; gap: 6px 18px; align-items: baseline; }
.statusline .status { margin: 0; }
.statusline #disconnect { margin-left: auto; padding: 4px 12px; font-size: .9rem; }
.statusline .status.ok::before { content: "●"; color: var(--ok); margin-right: .45em; }
.statusline .status.warn::before { content: "●"; color: var(--warn); margin-right: .45em; }
#port-id, #fw { color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .85rem; }
dialog { background: var(--card); color: var(--ink); border: 1px solid var(--line); border-radius: 10px; padding: 20px 24px; max-width: 420px; }
dialog::backdrop { background: rgba(0, 0, 0, .6); }
dialog h3 { margin: 0 0 8px; font-size: 1.1rem; }
dialog p { margin: 0 0 16px; color: var(--muted); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 16px; }
.log-card { grid-column: 1 / -1; }
.note { color: var(--muted); font-size: .88rem; margin: 10px 0 0; }

.times { border-collapse: collapse; width: 100%; margin-bottom: 12px; }
.times th { text-align: left; font-weight: 500; color: var(--muted); padding: 4px 8px 4px 0; width: 55%; }
.times td { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 1.05rem; padding: 4px 0; }
#tube-time { color: var(--glow); text-shadow: 0 0 8px rgba(255, 140, 26, .5); font-size: 1.4rem; }
#offset.ok { color: var(--ok); } #offset.warn { color: var(--warn); } #offset.err { color: var(--err); }

.setting { display: grid; grid-template-columns: 1fr; gap: 4px; padding: 8px 0; border-top: 1px solid var(--line); }
.setting:first-child { border-top: 0; }
.setting label { color: var(--muted); font-size: .9rem; }
.setting select { font: inherit; background: var(--bg); color: var(--ink); border: 1px solid var(--line); border-radius: 6px; padding: 5px 8px; }
.range select { width: auto; }
.setting small { color: var(--muted); }
.result { font-size: .85rem; min-height: 1.2em; }
.result.ok { color: var(--ok); } .result.err { color: var(--err); }

.digits { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.digits button { width: 44px; font-family: ui-monospace, Menlo, monospace; font-size: 1.1rem; color: var(--glow); }
#display-mode { margin-left: 10px; }

.log {
  height: 220px; overflow: auto; background: var(--bg); border: 1px solid var(--line); border-radius: 6px;
  padding: 8px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .8rem; white-space: pre-wrap;
}
.log-tx { color: var(--warn); } .log-rx { color: var(--ink); } .log-info { color: var(--muted); }

footer { margin-top: 24px; color: var(--muted); font-size: .85rem; }
footer a { color: var(--muted); }
code { font-family: ui-monospace, Menlo, monospace; }