:root {
  --bg: #0f0f11;
  --panel: #1c1c20;
  --line: #34343c;
  --input: #26262c;
  --text: #f2f2f6;
  --sub: #9696a2;
  --button: #2c2c34;
  --good: #4ad67c;
  --bad: #f06050;
  --site: #818cf8;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 "Segoe UI", system-ui, -apple-system, sans-serif;
}

.page { max-width: 860px; margin: 0 auto; padding: 28px 16px 40px; }

.top { display: flex; align-items: center; gap: 14px; }
.titles { flex: 1; min-width: 0; }
h1 { margin: 0; font-size: 22px; font-weight: 800; letter-spacing: .06em; color: var(--site); }
.sub { margin: 2px 0 0; color: var(--sub); font-size: 14px; }

.glyph {
  flex: none; width: 44px; height: 44px; border-radius: 12px;
  background: var(--panel); border: 1px solid var(--line);
  display: grid; place-items: center; color: var(--accent, var(--site));
}
.glyph svg { width: 26px; height: 26px; }
.glyph img { width: 100%; height: 100%; border-radius: 11px; }

.lang { display: flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; flex: none; }
.lang button {
  background: var(--button); color: var(--sub); border: 0; padding: 6px 10px;
  font: 700 12px/1 inherit; letter-spacing: .05em; cursor: pointer;
}
.lang button.on { background: var(--site); color: #0f0f11; }

.label {
  margin: 26px 0 8px 4px; font-size: 11px; font-weight: 700; letter-spacing: .12em;
  text-transform: uppercase; color: var(--sub);
}

.panel {
  margin: 0; padding: 16px; list-style: none;
  background: var(--panel); border: 1px solid var(--line); border-radius: 18px;
}

.steps li { display: flex; gap: 12px; align-items: flex-start; }
.steps li + li { margin-top: 10px; }
.steps .n {
  flex: none; width: 24px; height: 24px; border-radius: 8px; background: var(--input);
  color: var(--site); font-weight: 800; font-size: 13px; display: grid; place-items: center;
}

.help li { color: var(--sub); padding-left: 16px; position: relative; }
.help li + li { margin-top: 8px; }
.help li::before { content: ""; position: absolute; left: 2px; top: .65em; width: 5px; height: 5px; border-radius: 50%; background: var(--site); }

.warning {
  margin: 18px 0 0; padding: 12px 14px; border-radius: 14px;
  background: rgba(240, 96, 80, .12); border: 1px solid rgba(240, 96, 80, .45); color: #ffb4aa;
}

.firmwares { display: grid; gap: 14px; }

.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 22px; padding: 18px;
  background-image: radial-gradient(circle at 100% 0, color-mix(in srgb, var(--accent) 16%, transparent), transparent 55%);
}
.card-head { display: flex; gap: 14px; align-items: center; }
.card h3 { margin: 0; font-size: 18px; font-weight: 800; letter-spacing: .06em; color: var(--accent); }
.card .summary { margin: 12px 0 4px; color: var(--text); }

.badge {
  display: inline-block; margin-left: 6px; padding: 2px 8px; border-radius: 999px; vertical-align: 2px;
  font-size: 11px; font-weight: 800; letter-spacing: .04em;
  color: var(--accent); background: color-mix(in srgb, var(--accent) 15%, transparent);
}

.variant {
  display: flex; gap: 14px; align-items: center; margin-top: 12px; padding: 14px;
  background: var(--input); border-radius: 16px;
}
.variant-text { flex: 1; min-width: 0; }
.variant-text strong { display: block; }
.variant-text span { color: var(--sub); font-size: 13px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.chips span {
  font-size: 11px; font-weight: 700; color: var(--sub); padding: 2px 7px;
  border: 1px solid var(--line); border-radius: 7px;
}

esp-web-install-button { flex: none; --improv-primary-color: var(--accent); }
.btn {
  border: 0; border-radius: 14px; padding: 11px 20px; cursor: pointer;
  font: 800 15px/1 inherit; color: #0f0f11; background: var(--accent);
  box-shadow: 0 4px 16px color-mix(in srgb, var(--accent) 35%, transparent);
}
.btn:hover { filter: brightness(1.08); }
.btn.small { padding: 8px 14px; font-size: 13px; box-shadow: none; }
.no-serial { color: var(--sub); font-size: 13px; }

details { margin-top: 12px; border-top: 1px solid var(--line); padding-top: 10px; }
summary { cursor: pointer; font-weight: 700; color: var(--text); }
summary::marker { color: var(--accent); }
details p, details li { color: var(--sub); }
details ul { margin: 8px 0 0; padding-left: 20px; }

/* Diagram on the left, board buttons and notes beside it; stacked on phones, buttons first. */
.wiring {
  display: grid; grid-template-columns: 300px minmax(0, 1fr); grid-template-rows: auto 1fr;
  grid-template-areas: "img boards" "img notes"; column-gap: 18px; align-items: start; margin-top: 12px;
}
.diagram { grid-area: img; width: 100%; height: auto; border-radius: 16px; }
.wiring-notes { grid-area: notes; }
.wiring-notes p { margin: 12px 0 0; }
.boards { grid-area: boards; display: flex; flex-wrap: wrap; gap: 6px; }
.boards button {
  border: 1px solid var(--line); border-radius: 10px; padding: 7px 11px; cursor: pointer;
  background: var(--input); color: var(--sub); font: 700 13px/1.2 inherit; text-align: left;
}
.boards button[aria-pressed="true"] {
  color: var(--accent); border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, var(--input));
}

.older { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 8px; }
.older b { min-width: 52px; }

.foot { margin-top: 30px; text-align: center; color: var(--sub); font-size: 12px; }
.empty { color: var(--sub); }

@media (max-width: 560px) {
  .variant { flex-direction: column; align-items: stretch; }
  .variant .btn { width: 100%; }
  .wiring { grid-template-columns: minmax(0, 1fr); grid-template-rows: none; grid-template-areas: "boards" "img" "notes"; row-gap: 12px; }
  .diagram { max-width: 380px; justify-self: center; }
  .wiring-notes p:first-child { margin-top: 0; }
  h1 { font-size: 19px; }
}