/* DS4Arduino docs theme. Dark workbench surface, light-bar blue identity,
   PlayStation face colors reserved for pressed states on the tester. */
:root {
  --bg: oklch(0.18 0.02 260);
  --panel: oklch(0.23 0.025 260);
  --panel-2: oklch(0.26 0.03 260);
  --border: oklch(0.33 0.03 260);
  --text: oklch(0.92 0.008 260);
  --muted: oklch(0.66 0.02 260);
  --accent: oklch(0.68 0.16 250);
  --accent-soft: oklch(0.68 0.16 250 / 0.14);
  --green: oklch(0.74 0.15 145);
  --red: oklch(0.64 0.19 15);
  --pink: oklch(0.7 0.16 340);
  --amber: oklch(0.75 0.14 80);
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.7;
}
a { color: var(--accent); }
::selection { background: oklch(0.68 0.16 250 / 0.35); }

/* ---------- nav ---------- */
header.nav {
  display: flex;
  gap: 1.2rem;
  align-items: baseline;
  padding: 0.7rem 1.5rem;
  background: oklch(0.18 0.02 260 / 0.92);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
header.nav .mark {
  display: inline-block;
  width: 0.65rem; height: 0.65rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px 2px oklch(0.68 0.16 250 / 0.7);
  margin-right: 0.45rem;
  vertical-align: baseline;
}
header.nav strong { font-size: 1.05rem; letter-spacing: -0.01em; }
header.nav nav { display: flex; gap: 1.1rem; margin-left: auto; font-size: 0.95rem; }
header.nav nav a { text-decoration: none; }
header.nav nav a:hover { text-decoration: underline; }

main { max-width: 1020px; margin: 0 auto; padding: 1.5rem clamp(1rem, 4vw, 2.5rem) 3rem; }

/* ---------- brand hero ---------- */
.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(1.5rem, 5vw, 4rem);
  align-items: center;
  padding: clamp(2rem, 6vw, 4.5rem) 0 clamp(2rem, 5vw, 3.5rem);
}
.hero h1 {
  margin: 0 0 0.8rem;
  font-size: clamp(2.4rem, 6vw, 4rem);
  line-height: 1.04;
  letter-spacing: -0.025em;
  font-weight: 800;
}
.hero h1 .thin { display: block; font-weight: 400; color: var(--muted); font-size: 0.52em; letter-spacing: -0.01em; }
.hero p.lede { font-size: 1.08rem; color: var(--muted); max-width: 34rem; }
.specstrip {
  display: flex; flex-wrap: wrap; gap: 0.5rem 1.2rem;
  margin-top: 1.2rem; padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-family: var(--mono); font-size: 0.82rem; color: var(--muted);
}
.specstrip b { color: var(--text); font-weight: 600; }
.btnrow { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 1.4rem; }
.btn {
  display: inline-block;
  padding: 0.65rem 1.4rem;
  border-radius: 9px;
  background: var(--accent);
  color: oklch(0.16 0.02 260);
  text-decoration: none;
  font-weight: 700;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  transition: transform 180ms cubic-bezier(0.22, 1, 0.36, 1), filter 180ms;
}
.btn:hover { filter: brightness(1.12); }
.btn:active { transform: scale(0.97); }
.btn.secondary { background: transparent; border: 1px solid var(--border); color: var(--text); font-weight: 600; }
.btn:disabled { opacity: 0.45; cursor: default; transform: none; }
.padmark { width: 100%; height: auto; display: block; }
@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}
.rise { animation: rise 600ms cubic-bezier(0.22, 1, 0.36, 1) both; }
.rise.d1 { animation-delay: 90ms; }
.rise.d2 { animation-delay: 180ms; }

/* ---------- docs article ---------- */
.prose { max-width: 70ch; }
section.block { margin-bottom: clamp(2rem, 5vw, 3.5rem); }
h2.sect {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 0.4rem;
}
h2.sect .no { color: var(--accent); font-family: var(--mono); font-size: 0.85em; margin-right: 0.5rem; }
.sub { color: var(--muted); margin-top: 0; max-width: 62ch; }

ol.steps { list-style: none; counter-reset: step; margin: 1rem 0 0; padding: 0; }
ol.steps li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 2.6rem 1fr;
  gap: 0.9rem;
  padding: 0.75rem 0;
  border-top: 1px solid var(--border);
}
ol.steps li:last-child { border-bottom: 1px solid var(--border); }
ol.steps li::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--accent);
  padding-top: 0.15rem;
}

pre {
  background: oklch(0.14 0.015 260);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.65;
  font-family: var(--mono);
}
code.inline { font-family: var(--mono); font-size: 0.86em; background: oklch(0.14 0.015 260); padding: 0.12rem 0.4rem; border-radius: 6px; border: 1px solid var(--border); }

table.api { border-collapse: collapse; width: 100%; font-size: 0.9rem; }
table.api th, table.api td { border: 1px solid var(--border); padding: 0.45rem 0.65rem; text-align: left; vertical-align: top; }
table.api th { background: oklch(0.14 0.015 260); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }

.exrow {
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: 1.1rem;
  padding: 1rem 0;
  border-top: 1px solid var(--border);
}
.exrow:last-child { border-bottom: 1px solid var(--border); }
.exrow h3 { margin: 0; font-size: 1.05rem; }
.exrow p, .exrow ul { margin: 0.35rem 0; color: var(--muted); font-size: 0.94rem; }

dl.trouble { margin: 0; }
dl.trouble dt { font-family: var(--mono); font-size: 0.86rem; color: var(--amber); margin-top: 0.9rem; }
dl.trouble dd { margin: 0.15rem 0 0; color: var(--muted); }

.pill {
  display: inline-block;
  padding: 0.15rem 0.7rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid var(--border);
  white-space: nowrap;
}
.pill.ok { color: var(--green); border-color: var(--green); }
.pill.warn { color: var(--amber); border-color: var(--amber); }
.pill.bad { color: var(--red); border-color: var(--red); }
.muted { color: var(--muted); }

/* ---------- live tester ---------- */
.stage {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: clamp(0.8rem, 3vw, 1.6rem);
  margin-bottom: 1.2rem;
}
#padSvg { width: 100%; height: auto; display: block; max-width: 720px; margin: 0 auto; }
.padbody { fill: oklch(0.24 0.028 262); stroke: var(--border); stroke-width: 2; }
.padthumb { fill: oklch(0.45 0.05 260); stroke: oklch(0.6 0.05 260); stroke-width: 1.5; }
.padtouch { fill: none; stroke: transparent; stroke-width: 2; transition: stroke 120ms; }
#b-tp.on { stroke: var(--accent); filter: drop-shadow(0 0 6px oklch(0.68 0.16 250 / 0.8)); }
.zone { fill: transparent; transition: fill 120ms, fill-opacity 120ms; }
.zone.on { fill: var(--accent); fill-opacity: 0.45; }
.trigtab { fill: none; stroke: var(--border); stroke-width: 2; }
#l2fill, #r2fill { fill: var(--accent); }
#lightbar { fill: oklch(0.35 0.05 260); transition: fill 200ms, filter 200ms; }
#lightbar.on { fill: var(--accent); filter: drop-shadow(0 0 10px oklch(0.68 0.16 250 / 0.9)); }
.face { fill: oklch(0.2 0.02 260); stroke: var(--border); stroke-width: 1.5; transition: fill 120ms; }
.face text { fill: var(--muted); font-size: 13px; text-anchor: middle; font-family: var(--sans); }
#b-triangle.on circle { fill: var(--green); }
#b-circle.on circle { fill: var(--red); }
#b-cross.on circle { fill: var(--accent); }
#b-square.on circle { fill: var(--pink); }
#b-triangle.on text, #b-circle.on text, #b-cross.on text, #b-square.on text { fill: oklch(0.15 0.01 260); font-weight: 700; }
.sysbtn { fill: transparent; stroke: transparent; transition: fill 120ms; }
.sysbtn.on { fill: var(--accent); }
.battwrap { display: flex; gap: 1rem; align-items: center; margin-top: 0.7rem; }
.batticon { width: 118px; flex: none; }
.battbody { fill: none; stroke: var(--border); stroke-width: 2; }
.battnub { fill: var(--border); }
#battfill { fill: var(--green); }
.battbolt { fill: var(--amber); display: none; }
#battpct { font-size: 1.6rem; font-weight: 800; letter-spacing: -0.02em; }
.sysbtn text { fill: var(--muted); font-size: 10px; text-anchor: middle; font-family: var(--sans); }
.sysbtn.on text { fill: oklch(0.15 0.01 260); }
#b-l3 circle, #b-r3 circle { fill: none; stroke: var(--border); stroke-width: 1.5; }
#b-l3.on circle, #b-r3.on circle { fill: var(--accent); }
.shoulder { fill: oklch(0.2 0.02 260); stroke: var(--border); stroke-width: 1.5; transition: fill 120ms; }
.shoulder.on { fill: var(--amber); }
#l2fill, #r2fill { fill: var(--accent); }
.tdot { fill: var(--green); }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.1rem 1.2rem;
  margin-bottom: 1.2rem;
}
.panel h2 { margin: 0 0 0.5rem; font-size: 1.05rem; }
.bar { height: 12px; background: oklch(0.14 0.015 260); border: 1px solid var(--border); border-radius: 6px; overflow: hidden; }
.bar > div { height: 100%; width: 0%; background: var(--accent); transition: width 100ms linear; }
.att { width: 150px; display: block; margin: 0 auto; }
.attbezel { fill: oklch(0.14 0.015 260); stroke: var(--border); stroke-width: 2; }
.attsky { fill: oklch(0.36 0.08 250); }
.attgnd { fill: oklch(0.32 0.05 60); }
.attline { stroke: oklch(0.9 0.01 260); stroke-width: 1.5; }
.attline.dim { opacity: 0.45; }
#attBall { transition: transform 140ms cubic-bezier(0.22, 1, 0.36, 1); }
#attWings rect, #attWings circle { fill: var(--amber); }
/* steady numbers: changing widths must not reflow the page */
.kv span:last-child, #hz, #seq, #touchtxt, #battxt, #battpct, #attTxt,
#lxv, #lyv, #rxv, #ryv, #l2v, #r2v { font-variant-numeric: tabular-nums; }
#lastDs4 { display: block; max-height: 3.2em; overflow: hidden; text-overflow: ellipsis; }
.bar > div { height: 100%; width: 0%; background: var(--accent); transition: width 100ms linear; }
.kv { display: flex; justify-content: space-between; gap: 1rem; font-size: 0.92rem; padding: 0.2rem 0; }
.kv span:last-child { font-family: var(--mono); }
#log {
  height: 190px;
  overflow-y: auto;
  background: oklch(0.14 0.015 260);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.6rem 0.8rem;
  font-size: 0.76rem;
  font-family: var(--mono);
  white-space: pre-wrap;
}
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 0.7rem; }

footer { text-align: center; color: var(--muted); padding: 2.5rem 1rem; font-size: 0.85rem; border-top: 1px solid var(--border); }

@media (max-width: 760px) {
  .hero { grid-template-columns: 1fr; }
  .grid2 { grid-template-columns: 1fr; }
  .exrow { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  .rise { animation: none; }
  #attBall { transition: none; }
  html { scroll-behavior: auto; }
}