:root {
  --bg: #08080a;
  --ink: #f2f2f0;
  --dim: #8a8a92;
  --dimmer: #5c5c66;
  --line: #1e1e24;
  --panel: #0c0c10;
  --accent: #c8f751;
  --mono: "Cascadia Mono", "Consolas", "SF Mono", ui-monospace, monospace;
  --sans: "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system, sans-serif;
  --w: 1040px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
code, .path, .key { font-family: var(--mono); }

::selection { background: var(--accent); color: #0a0a0a; }

/* ---------- top bar ---------- */

.bar {
  display: flex;
  align-items: center;
  gap: 28px;
  max-width: var(--w);
  margin: 0 auto;
  padding: 22px 28px;
  border-bottom: 1px solid var(--line);
}

.mark { font-weight: 650; letter-spacing: .22em; font-size: 13px; }

.bar-nav {
  display: flex;
  gap: 24px;
  margin-left: auto;
  font-size: 13.5px;
  color: var(--dim);
}
.bar-nav a:hover { color: var(--ink); }

.bar-meta {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--dimmer);
  letter-spacing: .04em;
  padding-left: 24px;
  border-left: 1px solid var(--line);
}

/* ---------- intro ---------- */

.intro {
  max-width: var(--w);
  margin: 0 auto;
  padding: 104px 28px 96px;
}

.eyebrow {
  margin: 0 0 26px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--dimmer);
}

h1 {
  margin: 0;
  font-size: clamp(46px, 7.4vw, 92px);
  line-height: .94;
  letter-spacing: -.045em;
  font-weight: 680;
}

.sub {
  max-width: 560px;
  margin: 34px 0 0;
  font-size: 18px;
  line-height: 1.6;
  color: var(--dim);
}

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

.section {
  max-width: var(--w);
  margin: 0 auto;
  padding: 72px 28px;
  border-top: 1px solid var(--line);
}

.section-head {
  display: flex;
  gap: 28px;
  margin-bottom: 44px;
}
.idx {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--dimmer);
  padding-top: 6px;
  min-width: 28px;
}
.section-head h2 {
  margin: 0 0 8px;
  font-size: clamp(24px, 3vw, 32px);
  letter-spacing: -.03em;
  font-weight: 650;
}
.section-head p { margin: 0; color: var(--dim); font-size: 15px; max-width: 520px; }

/* ---------- controls / panel ---------- */

.controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, .82fr);
  gap: 56px;
  align-items: start;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  font-size: 13px;
  box-shadow: 0 30px 80px -40px #000;
}

.panel-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 14px 16px 12px;
}
.panel-brand { font-weight: 650; letter-spacing: .2em; font-size: 11px; }
.panel-ver { font-family: var(--mono); font-size: 10.5px; color: var(--dimmer); }

.tabs {
  display: flex;
  gap: 2px;
  padding: 0 12px;
  border-bottom: 1px solid var(--line);
}
.tab {
  appearance: none;
  background: none;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--dim);
  font: inherit;
  font-size: 12.5px;
  padding: 9px 10px 8px;
  cursor: pointer;
  transition: color .15s, border-color .15s;
}
.tab:hover { color: var(--ink); }
.tab.is-on { color: var(--ink); border-bottom-color: var(--accent); }

.pane { padding: 6px 16px 10px; }

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 46px;
  border-bottom: 1px solid #14141a;
}
.row:last-child { border-bottom: 0; }

.k {
  color: var(--dim);
  font-size: 12.5px;
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.k em {
  font-style: normal;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--dimmer);
  letter-spacing: .04em;
}

.seg {
  display: flex;
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
}
.seg-btn {
  appearance: none;
  background: none;
  border: 0;
  color: var(--dim);
  font: inherit;
  font-size: 11.5px;
  padding: 6px 11px;
  cursor: pointer;
}
.seg-btn + .seg-btn { border-left: 1px solid var(--line); }
.seg-btn:hover { color: var(--ink); }
.seg-btn.is-on { background: #17171d; color: var(--accent); }

.fov { display: flex; align-items: center; gap: 12px; }
#fov {
  appearance: none;
  width: 132px;
  height: 2px;
  background: #24242c;
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}
#fov::-webkit-slider-thumb {
  appearance: none;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 0;
}
#fov::-moz-range-thumb {
  width: 10px;
  height: 10px;
  border: 0;
  border-radius: 50%;
  background: var(--accent);
}
#fov-out {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink);
  min-width: 34px;
  text-align: right;
}

.sw {
  appearance: none;
  width: 34px;
  height: 19px;
  border-radius: 19px;
  border: 1px solid var(--line);
  background: #15151b;
  position: relative;
  cursor: pointer;
  padding: 0;
  transition: background .15s, border-color .15s;
}
.sw i {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: #4a4a56;
  transition: transform .15s, background .15s;
}
.sw.is-on { background: #1b2410; border-color: #3d4a20; }
.sw.is-on i { transform: translateX(15px); background: var(--accent); }

.key {
  font-size: 10.5px;
  letter-spacing: .06em;
  color: var(--ink);
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 2px 7px;
  background: #121218;
}
.key-wide { letter-spacing: 0; }

.path {
  font-size: 10.5px;
  color: var(--dimmer);
}

.controls-copy p { margin: 0 0 18px; color: var(--dim); font-size: 14.5px; }
.controls-copy p:last-child { margin-bottom: 0; }
.controls-copy strong { color: var(--ink); font-weight: 600; }
.controls-copy em { font-style: normal; color: #b9b9c2; }

/* ---------- feature rows ---------- */

.rows { list-style: none; margin: 0; padding: 0; }
.rows li {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 32px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}
.rows li:last-child { border-bottom: 1px solid var(--line); }
.row-k { font-size: 14px; font-weight: 600; }
.row-v { color: var(--dim); font-size: 14.5px; }
.row-v code {
  font-size: 12px;
  color: #b9b9c2;
  background: #101016;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 5px;
}

/* ---------- faq ---------- */

.qa { margin: 0; }
.qa > div {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 40px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}
.qa > div:last-child { border-bottom: 1px solid var(--line); }
.qa dt { font-size: 14.5px; font-weight: 600; }
.qa dd { margin: 0; color: var(--dim); font-size: 14.5px; }
.qa code {
  font-size: 12px;
  color: #b9b9c2;
  background: #101016;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 5px;
}

/* ---------- footer ---------- */

.foot {
  max-width: var(--w);
  margin: 0 auto;
  padding: 44px 28px 64px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  border-top: 1px solid var(--line);
}
.foot-brand { display: flex; align-items: baseline; gap: 14px; }
.foot .mark { font-size: 12px; }
.foot-note { font-family: var(--mono); font-size: 11.5px; color: var(--dimmer); }
.foot-legal {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 3px;
  margin: 0;
  text-align: right;
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--dimmer);
}
.foot-legal span:first-child { color: var(--dim); }

@media (max-width: 900px) {
  .controls { grid-template-columns: 1fr; gap: 40px; }
  .rows li { grid-template-columns: 1fr; gap: 6px; }
  .qa > div { grid-template-columns: 1fr; gap: 8px; }
  .intro { padding-top: 64px; }
  .bar-nav { display: none; }
  .foot { align-items: flex-start; }
  .foot-legal { align-items: flex-start; text-align: left; }
}