/* scpi-sim browser demo. Own, plain instrument look; no copy of any vendor's front panel. */

:root {
  color-scheme: light dark;
  --bg: #f4f2ee;
  --text: #1d2125;
  --muted: #5d6670;
  --card: #ffffff;
  --line: #d9d5cc;
  --accent: #1f6feb;
  --on-accent: #ffffff;
  --panel: #2b3036;
  --panel-text: #e7eaee;
  --panel-muted: #9aa4ae;
  --lcd-bg: #0f2a22;
  --lcd: #7dffb5;
  --led-off: #4a525a;
  --led-on: #3ddc84;
  --err: #ff6b5b;
  --fault: #f2b233;
  --term-bg: #111417;
  --term: #d7dde3;
  --term-cmd: #8fd3ff;
  --term-quiet: #7f8a94;
  --term-timeout: #ffb36b;
  --mono: ui-monospace, "SFMono-Regular", "DejaVu Sans Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16191c;
    --text: #e4e7ea;
    --muted: #9aa4ae;
    --card: #1f2327;
    --line: #343a40;
    --accent: #6ea8ff;
    --on-accent: #0b1220;
    --panel: #262b31;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 var(--sans);
}

.hero, main > section, footer { max-width: 1120px; margin: 0 auto; padding: 0 16px; }

.hero { padding-top: 40px; padding-bottom: 8px; }
.eyebrow { margin: 0; color: var(--muted); font: 600 13px/1 var(--mono); letter-spacing: .04em; text-transform: uppercase; }
h1 { font-size: clamp(28px, 5vw, 44px); line-height: 1.1; margin: 10px 0 12px; letter-spacing: -.01em; }
.lead { max-width: 720px; margin: 0; color: var(--muted); font-size: 18px; }
h2 { font-size: 22px; margin: 0 0 12px; }
a { color: var(--accent); }
code { font-family: var(--mono); font-size: .92em; }

/* --- bench layout --- */

.bench {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 20px;
  margin-top: 24px;
  margin-bottom: 48px;
}
.instruments { display: flex; flex-direction: column; gap: 10px; min-width: 0; }

.front {
  position: relative;
  background: var(--panel);
  color: var(--panel-text);
  border-radius: 10px;
  padding: 14px;
  box-shadow: 0 1px 0 rgba(255,255,255,.06) inset, 0 6px 18px rgba(0,0,0,.18);
  transition: opacity .3s, filter .3s;
}
.front-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 12px; margin-bottom: 10px; }
.model { font: 700 16px/1.2 var(--mono); }
.model small { font-weight: 400; color: var(--panel-muted); }
.kind { color: var(--panel-muted); font-size: 13px; }
.indicators { margin-left: auto; display: flex; gap: 6px; flex-wrap: wrap; }
.badge { font: 700 11px/1 var(--mono); padding: 4px 6px; border-radius: 4px; border: 1px solid var(--led-off); color: var(--panel-muted); }
.badge.out.on { border-color: var(--led-on); color: var(--led-on); }
.badge.err { border-color: var(--err); color: var(--err); }
.badge.fault { border-color: var(--fault); color: var(--fault); }

.channels { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; }
.channel { background: rgba(0,0,0,.22); border: 1px solid transparent; border-radius: 6px; padding: 8px; min-width: 0; }
.channel.selected { border-color: var(--panel-muted); }
.channel-head { display: flex; align-items: center; gap: 6px; font: 600 12px/1 var(--mono); }
.mode { margin-left: auto; color: var(--panel-muted); font-weight: 400; }
.channel.on .mode { color: var(--led-on); }
.led { width: 10px; height: 10px; border-radius: 50%; background: var(--led-off); flex: none; }
.led[data-on="true"] { background: var(--led-on); box-shadow: 0 0 8px var(--led-on); }
.actual { display: flex; flex-direction: column; margin: 8px 0 6px; padding: 6px; border-radius: 4px; background: var(--lcd-bg); color: var(--lcd); font: 600 15px/1.35 var(--mono); }
.channel:not(.on) .actual { opacity: .45; }
.setting { color: var(--panel-muted); font: 11px/1.3 var(--mono); overflow-wrap: anywhere; }

.wiring { display: flex; flex-wrap: wrap; justify-content: center; gap: 4px 24px; color: var(--muted); font: 12px/1.4 var(--mono); }

.lcd { background: var(--lcd-bg); color: var(--lcd); border-radius: 4px; padding: 12px; font: 600 clamp(16px, 3vw, 22px)/1.2 var(--mono); white-space: pre; overflow: hidden; text-overflow: ellipsis; }
.relays { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 10px; }
.relay { font: 11px/1 var(--mono); padding: 5px 6px; border-radius: 3px; border: 1px solid var(--led-off); color: var(--panel-muted); }
.relay.read { border-color: var(--lcd); color: var(--lcd); }
.relay.closed { background: var(--led-on); border-color: var(--led-on); color: #0b1a12; }

.powering { display: none; position: absolute; inset: auto 0 0 0; margin: 0; padding: 6px; text-align: center; font: 12px/1 var(--mono); color: var(--panel-muted); }
.loading .front { opacity: .55; filter: grayscale(1); }
.loading .powering { display: block; }
.failed .front { opacity: .55; filter: grayscale(1); }

/* --- console --- */

.console { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.targets { display: flex; align-items: center; gap: 6px; }
.targets button { font: 600 13px/1 var(--mono); padding: 7px 12px; border-radius: 6px; border: 1px solid var(--line); background: var(--card); color: var(--text); cursor: pointer; }
.targets button[aria-pressed="true"] { background: var(--text); color: var(--bg); border-color: var(--text); }
.status { margin-left: auto; color: var(--muted); font: 12px/1.3 var(--mono); text-align: right; }

.terminal { height: 260px; overflow-y: auto; background: var(--term-bg); color: var(--term); border-radius: 8px; padding: 10px 12px; font: 13px/1.5 var(--mono); }
.line { white-space: pre-wrap; overflow-wrap: anywhere; }
.line.command { color: var(--term-cmd); }
.line.quiet, .line.note { color: var(--term-quiet); }
.line.timeout, .line.error { color: var(--term-timeout); }

.prompt { display: flex; align-items: center; gap: 8px; background: var(--term-bg); border-radius: 8px; padding: 6px 6px 6px 12px; }
.prompt label { color: var(--term-cmd); font: 13px/1 var(--mono); }
.prompt input { flex: 1; min-width: 0; background: transparent; border: 0; color: var(--term); font: 14px/1.4 var(--mono); padding: 6px 0; outline: none; }
.prompt button { font: 600 13px/1 var(--sans); padding: 8px 14px; border: 0; border-radius: 6px; background: var(--accent); color: var(--on-accent); cursor: pointer; }

.hint { margin: 6px 0 0; color: var(--muted); font-size: 13px; }
.chips { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px; }
.chips button { display: grid; grid-template-columns: auto 1fr; gap: 2px 8px; text-align: left; padding: 8px 10px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); color: var(--text); font: 14px/1.3 var(--sans); cursor: pointer; min-width: 0; }
.chips button:hover:not(:disabled) { border-color: var(--accent); }
.chips .step { grid-row: span 2; align-self: center; width: 22px; height: 22px; border-radius: 50%; background: var(--accent); color: var(--on-accent); font: 700 12px/22px var(--mono); text-align: center; }
.chips code { color: var(--muted); font-size: 11px; overflow-wrap: anywhere; }

.faults { display: flex; flex-wrap: wrap; gap: 6px; }
.faults button { padding: 8px 12px; border-radius: 8px; border: 1px solid var(--fault); background: transparent; color: var(--text); font: 14px/1.2 var(--sans); cursor: pointer; }
.faults .reset { border-color: var(--line); }
button:disabled { opacity: .45; cursor: default; }
button:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.fallback { grid-column: 1 / -1; background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 16px; }
.fallback img { display: block; max-width: 100%; height: auto; border-radius: 6px; margin: 8px 0 12px; }
.fallback button { padding: 8px 16px; border-radius: 6px; border: 0; background: var(--accent); color: var(--on-accent); font: 600 14px/1 var(--sans); cursor: pointer; }

/* --- text sections --- */

main > section:not(.bench) { margin-bottom: 40px; }
.flow { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; margin: 0 0 14px; font: 13px/1.3 var(--mono); }
.flow .box { padding: 10px 12px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); }
.flow .sim { border: 2px dashed var(--accent); font-weight: 700; }
.flow .arrow, .flow .instead { color: var(--muted); }
.explain p, .more { max-width: 820px; }
pre { background: var(--term-bg); color: var(--term); border-radius: 8px; padding: 12px 14px; overflow-x: auto; font: 13px/1.5 var(--mono); }
.more ul { padding-left: 20px; }
.more li { margin-bottom: 6px; }
.links { display: flex; flex-wrap: wrap; gap: 8px 20px; }

footer { padding-top: 16px; padding-bottom: 32px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
footer p { margin: 4px 0; }

.prose { max-width: 720px; margin: 0 auto; padding: 40px 16px; }
.prose h1 { font-size: 32px; }

@media (max-width: 900px) {
  .bench { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 560px) {
  .channels { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .chips { grid-template-columns: minmax(0, 1fr); }
  .terminal { height: 200px; }
  .lead { font-size: 16px; }
}