:root {
  --ground: #0d1117;
  --steel: #111418;
  --panel: #161b22;
  --line: #2a3340;
  --ink: #e6ebf1;
  --dim: #8b95a1;
  --amber: #e8a33d;
  --green: #3ddc84;
  --red: #f85149;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  --disp: "Chakra Petch", "Arial Narrow", sans-serif;
  --body: Inter, system-ui, -apple-system, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--ground); color: var(--ink);
  font-family: var(--body); line-height: 1.6; font-size: 16px;
}
::selection { background: var(--amber); color: #111418; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; }
.mono, code.mono, .mono code { font-family: var(--mono); font-size: 0.92em; }
.skip {
  position: absolute; left: -999px; top: 0; background: var(--amber);
  color: #111418; padding: 8px 16px; z-index: 99; font-weight: 600;
}
.skip:focus { left: 8px; top: 8px; }

/* ── top bar ── */
.topbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 28px; border-bottom: 1px solid var(--line);
  position: sticky; top: 0; background: rgba(13,17,23,.92);
  backdrop-filter: blur(6px); z-index: 10;
}
.brand { display: flex; gap: 10px; align-items: center; text-decoration: none; color: var(--ink); font-family: var(--disp); font-weight: 700; font-size: 1.25rem; letter-spacing: .04em; }
.topbar nav { display: flex; gap: 4px; align-items: center; flex-wrap: wrap; }
.topbar nav a { color: var(--dim); text-decoration: none; padding: 6px 12px; border-radius: 8px; font-size: .95rem; }
.topbar nav a:hover { color: var(--ink); background: var(--panel); }
.topbar nav a.repo { color: var(--amber); border: 1px solid var(--line); }

/* ── hero ── */
.hero {
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px;
  max-width: 1200px; margin: 0 auto; padding: 72px 28px 56px;
  align-items: center;
}
.hero h1 {
  font-family: var(--disp); font-weight: 700; letter-spacing: -0.02em;
  font-size: clamp(2.2rem, 4.6vw, 3.6rem); line-height: 1.08;
  margin: 0 0 20px; text-wrap: balance;
}
.sub { color: var(--dim); font-size: 1.12rem; max-width: 34rem; }
.sub strong { color: var(--ink); }
.cmdbox {
  display: flex; gap: 0; margin-top: 26px; border: 1px solid var(--line);
  border-radius: 12px; overflow: hidden; background: var(--panel);
  max-width: 40rem;
}
.cmdbox code {
  flex: 1; padding: 14px 16px; font-family: var(--mono); font-size: .82rem;
  color: var(--green); overflow-x: auto; white-space: nowrap;
}
.cmdbox button {
  background: var(--amber); color: #111418; border: 0; padding: 0 22px;
  font: 600 .9rem var(--body); cursor: pointer;
}
.cmdbox button:hover { filter: brightness(1.1); }
.cmdnote { color: var(--dim); font-size: .9rem; margin: 10px 0 0; }
.hero-actions { display: flex; gap: 12px; margin-top: 22px; }
.btn { text-decoration: none; padding: 12px 26px; border-radius: 10px; font-weight: 600; }
.btn.solid { background: var(--amber); color: #111418; }
.btn.solid:hover { filter: brightness(1.1); }
.btn.ghost { border: 1px solid var(--line); color: var(--ink); }
.btn.ghost:hover { border-color: var(--amber); }

/* ── relay panel ── */
.panel {
  background: linear-gradient(180deg, #191f28, var(--steel));
  border: 1px solid var(--line); border-radius: 16px; padding: 22px;
  box-shadow: 0 24px 60px rgba(0,0,0,.5);
}
.panel-head { display: flex; justify-content: space-between; margin-bottom: 18px; }
.panel-title { font-family: var(--disp); letter-spacing: .18em; font-size: .8rem; color: var(--dim); }
.panel-model { font-size: .8rem; color: var(--dim); }
.breakers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.breaker {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 14px 8px 12px; cursor: pointer; display: flex; flex-direction: column;
  align-items: center; gap: 10px; color: var(--dim);
}
.breaker .slot {
  width: 34px; height: 62px; border-radius: 8px; background: #0a0d12;
  border: 1px solid var(--line); position: relative;
}
.breaker .lever {
  position: absolute; left: 4px; right: 4px; top: 4px; height: 26px;
  border-radius: 5px; background: #3a4450;
  box-shadow: 0 3px 0 rgba(0,0,0,.5); transition: top .18s ease-out, background .18s;
}
.breaker .blabel { font-family: var(--disp); font-size: .78rem; letter-spacing: .14em; }
.breaker.on { color: var(--ink); border-color: var(--amber); }
.breaker.on .lever { top: 30px; background: var(--amber); box-shadow: 0 -3px 0 rgba(0,0,0,.5), 0 4px 14px rgba(232,163,61,.35); }
.breaker[data-level="off"].on { border-color: var(--red); }
.breaker[data-level="off"].on .lever { background: var(--red); box-shadow: 0 -3px 0 rgba(0,0,0,.5), 0 4px 14px rgba(248,81,73,.35); }
.lamps { display: flex; gap: 18px; margin: 18px 2px 12px; font-family: var(--mono); font-size: .78rem; color: var(--dim); }
.lamp i {
  display: inline-block; width: 10px; height: 10px; border-radius: 50%;
  background: #3a4450; margin-right: 7px; vertical-align: 1px;
  transition: background .2s, box-shadow .2s;
}
.lamp.lit { color: var(--ink); }
.lamp.lit i { background: var(--amber); box-shadow: 0 0 10px var(--amber); }
.lamp.lit.green i { background: var(--green); box-shadow: 0 0 10px var(--green); }
.lamp.lit.red i { background: var(--red); box-shadow: 0 0 10px var(--red); }
.readout {
  margin: 0; background: #0a0d12; border: 1px solid var(--line);
  border-radius: 8px; padding: 14px 16px; font-size: .8rem; line-height: 1.7;
  color: var(--green); min-height: 5.4em; white-space: pre-wrap;
}

/* ── sections ── */
.section { max-width: 1200px; margin: 0 auto; padding: 56px 28px; border-top: 1px solid var(--line); }
.section h2 {
  font-family: var(--disp); font-size: clamp(1.6rem, 3vw, 2.3rem);
  letter-spacing: -0.015em; margin: 0 0 12px; text-wrap: balance;
}
.lede { color: var(--dim); font-size: 1.08rem; max-width: 44rem; margin: 0 0 30px; }
.wiring { width: 100%; height: auto; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 12px; }
.steps { list-style: none; counter-reset: s; padding: 0; margin: 30px 0 0; display: grid; gap: 14px; }
.steps li {
  counter-increment: s; display: grid; grid-template-columns: 44px 1fr; gap: 16px;
  align-items: start; background: var(--panel); border: 1px solid var(--line);
  border-radius: 12px; padding: 16px 20px;
}
.steps li::before {
  content: counter(s, decimal-leading-zero); font-family: var(--mono);
  color: var(--amber); font-size: 1.05rem; padding-top: 2px;
}

.install-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 28px; }
.procedure { list-style: none; counter-reset: p; padding: 0; margin: 0; display: grid; gap: 14px; }
.procedure li { counter-increment: p; display: grid; grid-template-columns: 44px 1fr; gap: 16px; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px 20px; }
.procedure li::before { content: counter(p, decimal-leading-zero); font-family: var(--mono); color: var(--amber); font-size: 1.05rem; }
.procedure p { margin: 0; }
.assure { background: var(--panel); border: 1px solid var(--amber); border-radius: 12px; padding: 20px 24px; align-self: start; }
.assure h3 { font-family: var(--disp); letter-spacing: .1em; font-size: .9rem; margin: 0 0 12px; color: var(--amber); }
.assure ul { margin: 0; padding-left: 20px; color: var(--dim); display: grid; gap: 8px; }

.levels { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.level { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 22px; }
.level h3 { font-family: var(--disp); letter-spacing: .08em; margin: 0 0 10px; font-size: 1.05rem; }
.level p { color: var(--dim); margin: 0 0 14px; }
.level code { display: inline-block; background: #0a0d12; border: 1px solid var(--line); border-radius: 6px; padding: 6px 12px; color: var(--green); }
.level.strict { border-top: 3px solid var(--green); }
.level.standard { border-top: 3px solid var(--amber); }
.level.off { border-top: 3px solid var(--red); }
.tag { font-size: .68rem; background: var(--green); color: #0a0d12; border-radius: 20px; padding: 2px 10px; vertical-align: 2px; letter-spacing: .06em; }
.envnote { color: var(--dim); margin-top: 18px; }

.honesty { background: var(--panel); border-top: 1px solid var(--amber); border-bottom: 1px solid var(--amber); }
.facts { width: 100%; border-collapse: collapse; font-size: .95rem; }
.facts th { text-align: left; font-family: var(--disp); letter-spacing: .1em; font-size: .78rem; color: var(--dim); padding: 10px 14px; border-bottom: 1px solid var(--line); }
.facts td { padding: 12px 14px; border-bottom: 1px solid var(--line); }
.facts tr:last-child td { border-bottom: 0; }
.facts td.mono { color: var(--amber); }

.faq { display: grid; gap: 0; margin: 0; }
.faq > div { border-bottom: 1px solid var(--line); padding: 18px 4px; }
.faq > div:first-child { border-top: 1px solid var(--line); }
.faq dt { font-weight: 600; font-size: 1.05rem; margin-bottom: 6px; }
.faq dd { margin: 0; color: var(--dim); max-width: 48rem; }

.close { max-width: 1200px; margin: 0 auto; padding: 72px 28px; text-align: left; border-top: 1px solid var(--line); }
.close h2 { font-family: var(--disp); font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -0.02em; margin: 0 0 10px; }
.close p { color: var(--dim); }
.close .cmdbox { margin-top: 20px; }
.repo-link { margin-top: 18px; }
.repo-link a { color: var(--amber); }

footer {
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  padding: 22px 28px; border-top: 1px solid var(--line); color: var(--dim);
  font-size: .9rem; max-width: 1200px; margin: 0 auto;
}

/* ── docs / changelog ── */
.page-head { max-width: 1200px; margin: 0 auto; padding: 56px 28px 8px; }
.page-head h1 { font-family: var(--disp); font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -0.02em; margin: 0 0 10px; }
.page-head p { color: var(--dim); max-width: 44rem; }
.doc-grid { max-width: 1200px; margin: 0 auto; padding: 24px 28px 64px; display: grid; grid-template-columns: 220px 1fr; gap: 40px; align-items: start; }
.doc-nav { position: sticky; top: 76px; display: flex; flex-direction: column; gap: 2px; }
.doc-nav a { color: var(--dim); text-decoration: none; padding: 7px 12px; border-radius: 8px; font-size: .93rem; }
.doc-nav a:hover { color: var(--ink); background: var(--panel); }
.doc-body { min-width: 0; }
.doc-body h2 { font-family: var(--disp); margin: 40px 0 10px; font-size: 1.5rem; }
.doc-body h2:first-child { margin-top: 0; }
.doc-body p, .doc-body li { color: #c3ccd6; }
.doc-body pre { background: #0a0d12; border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; overflow-x: auto; font-family: var(--mono); font-size: .83rem; line-height: 1.65; color: var(--green); }
.doc-body code { font-family: var(--mono); font-size: .88em; color: var(--amber); }
.doc-body pre code { color: var(--green); }
.doc-body table.cmds { width: 100%; border-collapse: collapse; font-size: .93rem; }
.doc-body table.cmds td { padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.doc-body table.cmds td:first-child { font-family: var(--mono); color: var(--green); white-space: nowrap; }
.release { border: 1px solid var(--line); border-radius: 12px; padding: 20px 24px; margin-bottom: 16px; background: var(--panel); }
.release h2 { margin: 0 0 4px !important; font-size: 1.2rem !important; }
.release time { font-family: var(--mono); font-size: .8rem; color: var(--dim); }
.release ul { margin: 12px 0 0; padding-left: 20px; color: #c3ccd6; display: grid; gap: 6px; }
.release code { font-family: var(--mono); font-size: .85em; color: var(--amber); }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 36px; padding-top: 48px; }
  .install-grid { grid-template-columns: 1fr; }
  .levels { grid-template-columns: 1fr; }
  .doc-grid { grid-template-columns: 1fr; }
  .doc-nav { position: static; flex-direction: row; flex-wrap: wrap; }
  .topbar { padding: 12px 16px; }
  .section, .page-head, .doc-grid, .close { padding-left: 18px; padding-right: 18px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .breaker .lever { transition: none; }
}